Science.gov

Sample records for left turns

  1. Warrants for left-turn lanes

    SciTech Connect

    Agent, K.R.

    1983-01-01

    Most states use accident, traffic-volume, or delay data as guidelines for installing left-turn lanes. Computer simulation of these data compares statistics of intersections with left-turn lanes to those without. The study found that special lanes always lead to improvement in traffic flow, but noted that all intersections cannot accommodate a special lane. The recommendations specify the accident rate, critical-volume determination, and the rate of traffice conflicts which warrant a separate left-turn lane. 10 references, 6 figures, 4 tables. (DCK)

  2. Safety evaluation of signalized intersections with left-turn waiting area in China.

    PubMed

    Jiang, Xinguo; Zhang, Guopeng; Bai, Wei; Fan, Wenbo

    2016-10-01

    In recent years the metropolitans in China have seen the surging installations of the left-turn waiting area (LWA) at the signalized intersections. The design allows the left-turning vehicles to enter the intersection at the onset of the through green phase (of the same approach) and wait for the exclusive left-turn signal at the LWA. The LWA layout can effectively reduce the probability of stranded and queue overflow of the left-turn vehicles, but no study is conducted yet to assess the safety performance of the signalized intersections with LWA. The paper adopts the traffic conflict technique (represented by post-encroachment time), compares the discrepancy of conflict types between intersections with LWA and without, and develops the severity models to identify the contributing factors for the left-turn conflicts. Results demonstrate that the left-turn volume, driving outside the LWA, running red light, the presence of secondary conflicts, and the rear-end conflicts significantly increase the severities of traffic conflicts at the LWA. The findings serve to provide recommendations to revise the current design standard of the LWA (GB5768-2009) and consequently improve the safety operations of signalized intersections with LWA in China. PMID:26410241

  3. Influence of bus stop with left-turn lines between two adjacent signalized intersections

    NASA Astrophysics Data System (ADS)

    Pang, Ming-Bao; Ye, Lan-Hang; Pei, Ya-Nan

    2016-08-01

    Based on the symmetric two-lane Nagel-Schreckenberg (STNS) model, a three-lane cellular automaton model between two intersections containing a bus stop with left-turning buses is established in which model the occurrences of vehicle accidents are taken into account. The characteristics of traffic flows with different ratios of left-turn lines are discussed via the simulation experiments. The results indicate that the left-turn lines have more negative effects on capacity, accident rate as well as delay if the stop is located close to the intersections, where the negative effect in a near-side stop is more severe than that in a far-side one. The range of appropriate position for a bus stop without the bottleneck effect becomes more and more narrow with the increase of the ratio of left-turn bus lines. When the inflow is small, a short signal cycle and a reasonable offset are beneficial. When the inflow reaches or exceeds the capacity, a longer signal cycle is helpful. But if the stop position is inappropriate, the increase of cycle fails in reducing the negative effect of left-turning buses and the effectiveness of offset is weakened. Project supported by the National Natural Science Foundation of China (Grant No. 50478088) and the Natural Science Foundation of Hebei Province, China (Grant No. E2015202266).

  4. Influence of bus stop with left-turn lines between two adjacent signalized intersections

    NASA Astrophysics Data System (ADS)

    Pang, Ming-Bao; Ye, Lan-Hang; Pei, Ya-Nan

    2016-08-01

    Based on the symmetric two-lane Nagel–Schreckenberg (STNS) model, a three-lane cellular automaton model between two intersections containing a bus stop with left-turning buses is established in which model the occurrences of vehicle accidents are taken into account. The characteristics of traffic flows with different ratios of left-turn lines are discussed via the simulation experiments. The results indicate that the left-turn lines have more negative effects on capacity, accident rate as well as delay if the stop is located close to the intersections, where the negative effect in a near-side stop is more severe than that in a far-side one. The range of appropriate position for a bus stop without the bottleneck effect becomes more and more narrow with the increase of the ratio of left-turn bus lines. When the inflow is small, a short signal cycle and a reasonable offset are beneficial. When the inflow reaches or exceeds the capacity, a longer signal cycle is helpful. But if the stop position is inappropriate, the increase of cycle fails in reducing the negative effect of left-turning buses and the effectiveness of offset is weakened. Project supported by the National Natural Science Foundation of China (Grant No. 50478088) and the Natural Science Foundation of Hebei Province, China (Grant No. E2015202266).

  5. Thunderstorm-scale variations of echoes associated with left-turn tornado families

    NASA Technical Reports Server (NTRS)

    Forbes, G. S.

    1977-01-01

    The origin of tornadoes is studied on the basis of changing radar echo shapes and tornado location relative to the echoes. Three types of tornadoes appear to be associated with different hook echo configurations. No-turn or right-turn tornadoes are linked to a steady hook which does not change shape or orientation. Left-turn tornado families are generated in cases where the hook is unsteady and changes orientation at each successive tornado birth. Finally, left-turn tornado families may also be formed when the hook undergoes no orientation change and the tornadoes move along the rear of the hook. The correlation between a thunderstorm-scale cycle and periodic tornado production is also discussed.

  6. Bicycle accidents and drivers' visual search at left and right turns.

    PubMed

    Summala, H; Pasanen, E; Räsänen, M; Sievänen, J

    1996-03-01

    The accident data base of the City of Helsinki shows that when drivers cross a cycle path as they enter a non-signalized intersection, the clearly dominant type of car-cycle crashes is that in which a cyclist comes from the right and the driver is turning right, in marked contrast to the cases with drivers turning left (Pasanen 1992; City of Helsinki, Traffic Planning Department, Report L4). This study first tested an explanation that drivers turning right simply focus their attention on the cars coming from the left-those coming from the right posing no threat to them-and fail to see the cyclist from the right early enough. Drivers' scanning behavior was studied at two T-intersections. Two well-hidden video cameras were used, one to measure the head movements of the approaching drivers and the other one to measure speed and distance from the cycle crossroad. The results supported the hypothesis: the drivers turning right scanned the right leg of the T-intersection less frequently and later than those turning left. Thus, it appears that drivers develop a visual scanning strategy which concentrates on detection of more frequent and major dangers but ignores and may even mask visual information on less frequent dangers. The second part of the study evaluated different countermeasures, including speed humps, in terms of drivers' visual search behavior. The results suggested that speed-reducing countermeasures changed drivers' visual search patterns in favor of the cyclists coming from the right, presumably at least in part due to the fact that drivers were simply provided with more time to focus on each direction. PMID:8703272

  7. Augmented reality cues to assist older drivers with gap estimation for left-turns.

    PubMed

    Rusch, Michelle L; Schall, Mark C; Lee, John D; Dawson, Jeffrey D; Rizzo, Matthew

    2014-10-01

    The objective of this study was to assess the effects of augmented reality (AR) cues designed to assist middle-aged and older drivers with a range of UFOV impairments, judging when to make left-turns across oncoming traffic. Previous studies have shown that AR cues can help middle-aged and older drivers respond to potential roadside hazards by increasing hazard detection without interfering with other driving tasks. Intersections pose a critical challenge for cognitively impaired drivers, prone to misjudge time-to-contact with oncoming traffic. We investigated whether AR cues improve or interfere with hazard perception in left-turns across oncoming traffic for drivers with age-related cognitive decline. Sixty-four middle-aged and older drivers with a range of UFOV impairment judged when it would be safe to turn left across oncoming traffic approaching the driver from the opposite direction in a rural stop-sign controlled intersection scenario implemented in a static base driving simulator. Outcome measures used to evaluate the effectiveness of AR cueing included: Time-to-Contact (TTC), Gap Time Variation (GTV), Response Rate, and Gap Response Variation (GRV). All drivers estimated TTCs were shorter in cued than in uncued conditions. In addition, drivers responded more often in cued conditions than in uncued conditions and GRV decreased for all drivers in scenarios that contained AR cues. For both TTC and response rate, drivers also appeared to adjust their behavior to be consistent with the cues, especially drivers with the poorest UFOV scores (matching their behavior to be close to middle-aged drivers). Driver ratings indicated that cueing was not considered to be distracting. Further, various conditions of reliability (e.g., 15% miss rate) did not appear to affect performance or driver ratings.

  8. AUGMENTED REALITY CUES TO ASSIST OLDER DRIVERS WITH GAP ESTIMATION FOR LEFT-TURNS

    PubMed Central

    Rusch, Michelle L.; Schall, Mark C.; Lee, John D.; Dawson, Jeffrey D.; Rizzo, Matthew

    2014-01-01

    The objective of this study was to assess the effects of augmented reality (AR) cues designed to assist middle-aged and older drivers with a range of UFOV impairments, judging when to make left-turns across oncoming traffic. Previous studies have shown that AR cues can help middle-aged and older drivers respond to potential roadside hazards by increasing hazard detection without interfering with other driving tasks. Intersections pose a critical challenge for cognitively impaired drivers, prone to misjudge time-to-contact with oncoming traffic. We investigated whether AR cues improve or interfere with hazard perception in left-turns across oncoming traffic for drivers with age-related cognitive decline. Sixty-four middle-aged and older drivers with a range of UFOV impairment judged when it would be safe to turn left across oncoming traffic approaching the driver from the opposite direction in a rural stop-sign controlled intersection scenario implemented in a static base driving simulator. Outcome measures used to evaluate the effectiveness of AR cueing included: Time-to-Contact (TTC), Gap Time Variation (GTV), Response Rate, and Gap Response Variation (GRV). All drivers estimated TTCs were shorter in cued than in uncued conditions. In addition, drivers responded more often in cued conditions than in uncued conditions and GRV decreased for all drivers in scenarios that contained AR cues. For both TTC and response rate, drivers also appeared to adjust their behavior to be consistent with the cues, especially drivers with the poorest UFOV scores (matching their behavior to be close to middle-aged drivers). Driver ratings indicated that cueing was not considered to be distracting. Further, various conditions of reliability (e.g., 15% miss rate) did not appear to affect performance or driver ratings. PMID:24950128

  9. Left-turn phase: permissive, protected, or both? A quasi-experimental design in New York City.

    PubMed

    Chen, Li; Chen, Cynthia; Ewing, Reid

    2015-03-01

    The practice of left-turn phasing selection (permissive, protected-only, or both) varies from one locality to another. The literature evidence on this issue is equally mixed and insufficient. In this study, we evaluate the safety impacts of changing left-turn signal phasing from permissive to protected/permissive or protected-only at 68 intersections in New York City using a rigorous quasi-experimental design accompanied with regression modeling. Changes in police reported crashes including total crashes, multiple-vehicle crashes, left-turn crashes, pedestrian crashes and bicyclist crashes were compared between before period and after period for the treatment group and comparison group by means of negative binomial regression using a Generalized Estimating Equations (GEE) technique. Confounding factors such as the built environment characteristics that were not controlled in comparison group selection are accounted for by this approach. The results show that the change of permissive left-turn signal phasing to protected/permissive or protected-only signal phasing does not result in a significant reduction in intersection crashes. Though the protected-only signal phasing does reduce the left-turn crashes and pedestrian crashes, this reduction was offset by a possible increase in over-taking crashes. These results suggest that left-turn phasing should not be treated as a universal solution that is always better than the permissive control for left-turn vehicles. The selection and implementation of left-turn signal phasing needs to be done carefully, considering potential trade-offs between safety and delay, and many other factors such as geometry, traffic flows and operations. PMID:25626164

  10. A restricted branch and bound approach for setting the left turn phase sequences in signalized networks

    SciTech Connect

    Pillai, R.S.; Rathi, A.K.; Cohen, S.

    1994-07-01

    The main objective of synchronized signal timing is to keep traffic moving along arterial in platoons throughout the signal system by proper setting of left turn phase sequence at signals along the arterials/networks. The synchronization of traffic signals located along the urban/suburban arterials in metropolitan areas is perhaps one of the most cost-effective method for improving traffic flow along these streets. The popular technique for solving this problem formulates it as a mixed integer linear program and used Land and Powell branch and bound search to arrive at the optimal solution. The computation time tends to be excessive for realistic multiarterial network problems due to the exhaustive nature of the branch and bound search technique. Furthermore, the Land and Powell branch and bound code is known to be numerically unstable, which results in suboptimal solutions for network problems with a range on the cycle time variable. This paper presents the development of a fast and numerically stable heuristic, developed using MINOS linear programming solver. The new heuristic can generate optimal/near-optimal solutions in a fraction of the time needed to compute the optimal solution by Land and Powell code. The solution technique is based on restricted search using branch and bound technique. The efficiency of the heuristic approach is demonstrated by numerical results for a set of test problems.

  11. Driving simulator evaluation of drivers' response to intersections with dynamic use of exit-lanes for left-turn.

    PubMed

    Zhao, Jing; Yun, Meiping; Zhang, H Michael; Yang, Xiaoguang

    2015-08-01

    With the worsening of urban traffic congestion in large cities around the world, researchers have been looking for unconventional designs and/or controls to squeeze more capacity out of intersections, the most common bottlenecks of the road network. One of these innovative intersection designs, known as the exit-lanes for left-turn (EFL), opens up exit-lanes to be used by left-turn traffic with the help of an additional traffic light installed at the median opening (the pre-signal). This paper studies how drivers respond to EFL intersections with a series of driving simulator experiments. In our experiments, 64 drivers were recruited and divided into two groups. One group is trained to use the EFL while the other group is not. In addition, four scenarios were considered with different sign and marking designs and traffic conditions in the experiments. Results indicate that drivers show certain amount of confusion and hesitation when encountering an EFL intersection for the first time. They can be overcome, however, by increasing exposure through driver education or by cue provided from other vehicles. Moreover, drivers unfamiliar with EFL operation can make a left turn using the conventional left-turn lanes as usual. The EFL operation is not likely to pose any serious safety risk of the intersection in real life operations.

  12. Driving simulator evaluation of drivers' response to intersections with dynamic use of exit-lanes for left-turn.

    PubMed

    Zhao, Jing; Yun, Meiping; Zhang, H Michael; Yang, Xiaoguang

    2015-08-01

    With the worsening of urban traffic congestion in large cities around the world, researchers have been looking for unconventional designs and/or controls to squeeze more capacity out of intersections, the most common bottlenecks of the road network. One of these innovative intersection designs, known as the exit-lanes for left-turn (EFL), opens up exit-lanes to be used by left-turn traffic with the help of an additional traffic light installed at the median opening (the pre-signal). This paper studies how drivers respond to EFL intersections with a series of driving simulator experiments. In our experiments, 64 drivers were recruited and divided into two groups. One group is trained to use the EFL while the other group is not. In addition, four scenarios were considered with different sign and marking designs and traffic conditions in the experiments. Results indicate that drivers show certain amount of confusion and hesitation when encountering an EFL intersection for the first time. They can be overcome, however, by increasing exposure through driver education or by cue provided from other vehicles. Moreover, drivers unfamiliar with EFL operation can make a left turn using the conventional left-turn lanes as usual. The EFL operation is not likely to pose any serious safety risk of the intersection in real life operations. PMID:25969158

  13. Evaluation of a Risk Awareness Perception Training Program on Novice Teen Driver Behavior at Left-Turn Intersections

    PubMed Central

    McDonald, Catherine C.; Kandadai, Venk; Loeb, Helen; Seacrist, Thomas; Lee, Yi-Ching; Bonfiglio, Dana; Fisher, Donald L.; Winston, Flaura K.

    2015-01-01

    Collisions at left turn intersections are among the most prevalent types of teen driver serious crashes, with inadequate surveillance as a key factor. Risk awareness perception training (RAPT) has shown effectiveness in improving hazard anticipation for latent hazards. The goal of this study was to determine if RAPT version 3 (RAPT-3) improved intersection turning behaviors among novice teen drivers when the hazards were not latent and frequent glancing to multiple locations at the intersection was needed. Teens aged 16–18 with ≤180 days of licensure were randomly assigned to: 1) an intervention group (n=18) that received RAPT-3 (Trained); or 2) a control group (n=19) that received no training (Untrained). Both groups completed RAPT-3 Baseline Assessment and the Trained group completed RAPT-3 Training and RAPT-3 Post Assessment. Training effects were evaluated on a driving simulator. Simulator (gap selection errors and collisions) and eye tracker (traffic check errors) metrics from six left-turn stop sign controlled intersections in the Simulated Driving Assessment (SDA) were analyzed. The Trained group scored significantly higher in RAPT-3 Post Assessment than RAPT-3 Baseline Assessment (p< 0.0001). There were no significant differences in either traffic check and gap selection errors or collisions among Trained and Untrained teens in the SDA. Though Trained teens learned about hazard anticipation related to latent hazards, learning did not translate to performance differences in left-turn stop sign controlled intersections where the hazards were not latent. Our findings point to further research to better understand the challenges teens have with left turn intersections. PMID:26709331

  14. Effects of major-road vehicle speed and driver age and gender on left-turn gap acceptance.

    PubMed

    Yan, Xuedong; Radwan, Essam; Guo, Dahai

    2007-07-01

    Because the driver's gap-acceptance maneuver is a complex and risky driving behavior, it is a highly concerned topic for traffic safety and operation. Previous studies have mainly focused on the driver's gap acceptance decision itself but did not pay attention to the maneuver process and driving behaviors. Using a driving simulator experiment for left-turn gap acceptance at a stop-controlled intersection, this study evaluated the effects of major traffic speed and driver age and gender on gap acceptance behaviors. The experiment results illustrate relationships among drivers' left-turn gap decision, driver's acceleration rate, steering action, and the influence of the gap-acceptance maneuver on the vehicles in the major traffic stream. The experiment results identified an association between high crash risk and high traffic speed at stop-controlled intersections. The older drivers, especially older female drivers, displayed a conservative driving attitude as a compensation for reduced driving ability, but also showed to be the most vulnerable group for the relatively complex driving maneuvers. PMID:17239808

  15. Left-handed helical preference in an achiral peptide chain is induced by an L-amino acid in an N-terminal type II β-turn.

    PubMed

    De Poli, Matteo; De Zotti, Marta; Raftery, James; Aguilar, Juan A; Morris, Gareth A; Clayden, Jonathan

    2013-03-15

    Oligomers of the achiral amino acid Aib adopt helical conformations in which the screw-sense may be controlled by a single N-terminal residue. Using crystallographic and NMR techniques, we show that the left- or right-handed sense of helical induction arises from the nature of the β-turn at the N terminus: the tertiary amino acid L-Val induces a left-handed type II β-turn in both the solid state and in solution, while the corresponding quaternary amino acid L-α-methylvaline induces a right-handed type III β-turn.

  16. Evidence of population-level lateralized behaviour in giant water bugs, Belostoma flumineum Say (Heteroptera: Belostomatidae): T-maze turning is left biased.

    PubMed

    Kight, Scott L; Steelman, Laura; Coffey, Gena; Lucente, Julie; Castillo, Marianne

    2008-09-01

    Lateralized behaviour occurs in diverse animals, but relatively few studies examine the phenomenon in invertebrates. Here we report a population-level left turn bias in the giant water bug Belostoma flumineum Say (Heteroptera: Belostomatidae) in an underwater T-maze. Individuals made significantly more left turns than right turns, including when they were naïve and first introduced to the maze. Water bugs also showed significantly longer runs of consecutive left turns than right turns (i.e. LLLLL). The length of these runs, however, did not increase with experience in the maze, suggesting that the effect is not the result of learning. There were also no differences in turning bias between male and female water bugs. The proximate mechanism(s) underlying the left turn bias is unknown, but directional cues in the environment were eliminated by rotating the maze 180 degrees between experiments, suggesting the mechanism(s) is endogenous. To our knowledge this is the first study of lateralized behaviour in the Heteroptera or in a swimming invertebrate animal.

  17. A circuit motif in the zebrafish hindbrain for a two alternative behavioral choice to turn left or right

    PubMed Central

    Koyama, Minoru; Minale, Francesca; Shum, Jennifer; Nishimura, Nozomi; Schaffer, Chris B; Fetcho, Joseph R

    2016-01-01

    Animals collect sensory information from the world and make adaptive choices about how to respond to it. Here, we reveal a network motif in the brain for one of the most fundamental behavioral choices made by bilaterally symmetric animals: whether to respond to a sensory stimulus by moving to the left or to the right. We define network connectivity in the hindbrain important for the lateralized escape behavior of zebrafish and then test the role of neurons by using laser ablations and behavioral studies. Key inhibitory neurons in the circuit lie in a column of morphologically similar cells that is one of a series of such columns that form a developmental and functional ground plan for building hindbrain networks. Repetition within the columns of the network motif we defined may therefore lie at the foundation of other lateralized behavioral choices. DOI: http://dx.doi.org/10.7554/eLife.16808.001 PMID:27502742

  18. Structure of the hypothetical protein Ton1535 from Thermococcus onnurineus NA1 reveals unique structural properties by a left-handed helical turn in normal α-solenoid protein.

    PubMed

    Jeong, Jae-Hee; Kim, Yi-Seul; Rojvirija, Catleya; Cha, Hyung Jin; Kim, Yeon-Gil; Ha, Sung Chul

    2014-06-01

    The crystal structure of Ton1535, a hypothetical protein from Thermococcus onnurineus NA1, was determined at 2.3 Å resolution. With two antiparallel α-helices in a helix-turn-helix motif as a repeating unit, Ton1535 consists of right-handed coiled N- and C-terminal regions that are stacked together using helix bundles containing a left-handed helical turn. One left-handed helical turn in the right-handed coiled structure produces two unique structural properties. One is the presence of separated concave grooves rather than one continuous concave groove, and the other is the contribution of α-helices on the convex surfaces of the N-terminal region to the extended surface of the concave groove of the C-terminal region and vice versa.

  19. Turning crocodilian hearts into bird hearts: growth rates are similar for alligators with and without right-to-left cardiac shunt

    PubMed Central

    Eme, John; Gwalthney, June; Owerkowicz, Tomasz; Blank, Jason M.; Hicks, James W.

    2010-01-01

    The functional and possible adaptive significance of non-avian reptiles' dual aortic arch system and the ability of all non-avian reptiles to perform central vascular cardiac shunts have been of great interest to comparative physiologists. The unique cardiac anatomy of crocodilians – a four-chambered heart with the dual aortic arch system – allows for only right-to-left (R–L; pulmonary bypass) cardiac shunt and for surgical elimination of this shunt. Surgical removal of the R–L shunt, by occluding the left aorta (LAo) upstream and downstream of the foramen of Panizza, results in a crocodilian with an obligatory, avian/mammalian central circulation. In this study, R–L cardiac shunt was eliminated in age-matched, female American alligators (Alligator mississippiensis; 5–7 months of age). We tested the hypothesis that surgical elimination of R–L cardiac shunt would impair growth (a readily measured proxy for fitness) compared with sham-operated, age-matched controls, especially in animals subjected to exhaustive exercise. While regular exercise caused a decrease in size (snout-to-vent length, head length and body mass), elimination of the capacity for R–L cardiac shunt did not greatly reduce animal growth, despite a chronic ventricular enlargement in surgically altered juvenile alligators. We speculate that, despite being slightly smaller, alligators with an occluded LAo would have reached sexual maturity in the same breeding season as control alligators. This study suggests that crocodilian R–L cardiac shunt does not provide an adaptive advantage for juvenile alligator growth and supports the logic that cardiac shunts persist in crocodilians because they have not been selected against. PMID:20639429

  20. Taking Turns

    ERIC Educational Resources Information Center

    Hopkins, Brian

    2010-01-01

    Two people take turns selecting from an even number of items. Their relative preferences over the items can be described as a permutation, then tools from algebraic combinatorics can be used to answer various questions. We describe each person's optimal selection strategies including how each could make use of knowing the other's preferences. We…

  1. What 'empirical turn in bioethics'?

    PubMed

    Hurst, Samia

    2010-10-01

    Uncertainty as to how we should articulate empirical data and normative reasoning seems to underlie most difficulties regarding the 'empirical turn' in bioethics. This article examines three different ways in which we could understand 'empirical turn'. Using real facts in normative reasoning is trivial and would not represent a 'turn'. Becoming an empirical discipline through a shift to the social and neurosciences would be a turn away from normative thinking, which we should not take. Conducting empirical research to inform normative reasoning is the usual meaning given to the term 'empirical turn'. In this sense, however, the turn is incomplete. Bioethics has imported methodological tools from empirical disciplines, but too often it has not imported the standards to which researchers in these disciplines are held. Integrating empirical and normative approaches also represents true added difficulties. Addressing these issues from the standpoint of debates on the fact-value distinction can cloud very real methodological concerns by displacing the debate to a level of abstraction where they need not be apparent. Ideally, empirical research in bioethics should meet standards for empirical and normative validity similar to those used in the source disciplines for these methods, and articulate these aspects clearly and appropriately. More modestly, criteria to ensure that none of these standards are completely left aside would improve the quality of empirical bioethics research and partly clear the air of critiques addressing its theoretical justification, when its rigour in the particularly difficult context of interdisciplinarity is what should be at stake.

  2. Nematode Chemotaxis: Gradual Turns, Sharp Turns, and Modulated Turn Angles

    NASA Astrophysics Data System (ADS)

    Patel, Amar; Padmanabhan, Venkat; Rumbaugh, Kendra; Vanapalli, Siva; Blawzdziewicz, Jerzy

    2013-03-01

    We examine strategies used by the soil-dwelling nematode Caenorhabditis Elegans for chemotaxis in complex environments. The proposed description is based on our recently developed piecewise-harmonic-curvature model of nematode locomotion [PLoS ONE, 7(7) e40121 (2012)], where random harmonic-curvature modes represent elementary locomotory movements. We show that the previously described gradual-turn and sharp-turn chemotaxis strategies can be unified in our model. The gradual-turn mechanism relies on crawling amplitude changes commensurate with the undulation frequency. The sharp-turn mechanism consists in modulation of the frequency of jumps to large-amplitude modes. We hypothesize that there exists a third strategy, where the nematode adjusts the variance of the amplitude distribution. Such adjustments result in a modulation of the magnitude of random turns, with smaller turns performed when the nematode moves toward the increasing chemoatractant concentration. Experiments are proposed to determine if the third strategy is present in the nematode behavior. This work was supported by NSF grant No. CBET 1059745.

  3. Agricultural Turns, Geographical Turns: Retrospect and Prospect

    ERIC Educational Resources Information Center

    Morris, Carol; Evans, Nick

    2004-01-01

    It is accepted that British rural geography has actively engaged with the "cultural turn", leading to a resurgence of research within the sub-discipline. However, a reading of recent reviews suggests that the cultural turn has largely, if not completely, bypassed those geographers interested in the agricultural sector. Farming centred engagements…

  4. Turning towards History: Turning towards Utopia

    ERIC Educational Resources Information Center

    Freeman-Moir, John

    2004-01-01

    Turning towards history--to be contrasted with turning away from history--captures the Marxian sense of education. Marx worked out the elements of a theory of political education in relation to history by equating education with the coincidence of the changing of circumstances and people. This theory received its most comprehensive yet succinct…

  5. To turn or not to turn?

    NASA Astrophysics Data System (ADS)

    Beta, Carsten

    2016-05-01

    Bacteria typically swim in straight runs, interruped by sudden turning events. In particular, some species are limited to a reversal in the swimming direction as the only turning maneuver at their disposal. In a recent article, Großmann et al (2016 New J. Phys. 18 043009) introduce a theoretical framework to analyze the diffusive properties of active particles following this type of run-and-reverse pattern. Based on a stochastic clock model to mimic the regulatory pathway that triggers reversal events, they show that a run-and-reverse swimmer can optimize its diffusive spreading by tuning the reversal rate according to the level of rotational noise. With their approach, they open up promising new perspectives of how to incorporate the dynamics of intracellular signaling into coarse-grained active particle descriptions.

  6. Measuring zebrafish turning rate.

    PubMed

    Mwaffo, Violet; Butail, Sachit; di Bernardo, Mario; Porfiri, Maurizio

    2015-06-01

    Zebrafish is becoming a popular animal model in preclinical research, and zebrafish turning rate has been proposed for the analysis of activity in several domains. The turning rate is often estimated from the trajectory of the fish centroid that is output by commercial or custom-made target tracking software run on overhead videos of fish swimming. However, the accuracy of such indirect methods with respect to the turning rate associated with changes in heading during zebrafish locomotion is largely untested. Here, we compare two indirect methods for the turning rate estimation using the centroid velocity or position data, with full shape tracking for three different video sampling rates. We use tracking data from the overhead video recorded at 60, 30, and 15 frames per second of zebrafish swimming in a shallow water tank. Statistical comparisons of absolute turning rate across methods and sampling rates indicate that, while indirect methods are indistinguishable from full shape tracking, the video sampling rate significantly influences the turning rate measurement. The results of this study can aid in the selection of the video capture frame rate, an experimental design parameter in zebrafish behavioral experiments where activity is an important measure.

  7. Hydrodynamics of Turning Flocks.

    PubMed

    Yang, Xingbo; Marchetti, M Cristina

    2015-12-18

    We present a hydrodynamic model of flocking that generalizes the familiar Toner-Tu equations to incorporate turning inertia of well-polarized flocks. The continuum equations controlled by only two dimensionless parameters, orientational inertia and alignment strength, are derived by coarse-graining the inertial spin model recently proposed by Cavagna et al. The interplay between orientational inertia and bend elasticity of the flock yields anisotropic spin waves that mediate the propagation of turning information throughout the flock. The coupling between spin-current density to the local vorticity field through a nonlinear friction gives rise to a hydrodynamic mode with angular-dependent propagation speed at long wavelengths. This mode becomes unstable as a result of the growth of bend and splay deformations augmented by the spin wave, signaling the transition to complex spatiotemporal patterns of continuously turning and swirling flocks.

  8. Hydrodynamics of Turning Flocks.

    PubMed

    Yang, Xingbo; Marchetti, M Cristina

    2015-12-18

    We present a hydrodynamic model of flocking that generalizes the familiar Toner-Tu equations to incorporate turning inertia of well-polarized flocks. The continuum equations controlled by only two dimensionless parameters, orientational inertia and alignment strength, are derived by coarse-graining the inertial spin model recently proposed by Cavagna et al. The interplay between orientational inertia and bend elasticity of the flock yields anisotropic spin waves that mediate the propagation of turning information throughout the flock. The coupling between spin-current density to the local vorticity field through a nonlinear friction gives rise to a hydrodynamic mode with angular-dependent propagation speed at long wavelengths. This mode becomes unstable as a result of the growth of bend and splay deformations augmented by the spin wave, signaling the transition to complex spatiotemporal patterns of continuously turning and swirling flocks. PMID:26722945

  9. Flip Turns with Students

    ERIC Educational Resources Information Center

    Queeney, Kate

    2014-01-01

    Kate Queeney, a professor of chemistry at Smith College, turned to a former student to receive one-on-one instruction in swimming. The student, who had been unsure and scared in chemistry class, seemed like an entirely different person when teaching the teacher. This article describes how the author learned that there is something undeniably…

  10. Bacteria turn tiny gears

    SciTech Connect

    2009-01-01

    Swarms of bacteria turn two 380-micron long gears, opening the possibility of building hybrid biological machines at the microscopic scale. Read more at Wired: http://www.wired.com/wiredscience/2009/12/bacterial-micro-machine/#more-15684 or Scientific American: http://www.scientificamerican.com/article.cfm?id=brownian-motion-bacteria

  11. Diamond turning of glass

    SciTech Connect

    Blackley, W.S.; Scattergood, R.O.

    1988-12-01

    A new research initiative will be undertaken to investigate the critical cutting depth concepts for single point diamond turning of brittle, amorphous materials. Inorganic glasses and a brittle, thermoset polymer (organic glass) are the principal candidate materials. Interrupted cutting tests similar to those done in earlier research are Ge and Si crystals will be made to obtain critical depth values as a function of machining parameters. The results will provide systematic data with which to assess machining performance on glasses and amorphous materials

  12. Hypoplastic left heart syndrome

    MedlinePlus

    HLHS; Congenital heart - hypoplastic left heart; Cyanotic heart disease - hypoplastic left heart ... Hypoplastic left heart is a rare type of congenital heart disease. It is more common in males than in females. As ...

  13. Eye Gaze Behavior at Turn Transition: How Aphasic Patients Process Speakers' Turns during Video Observation.

    PubMed

    Preisig, Basil C; Eggenberger, Noëmi; Zito, Giuseppe; Vanbellingen, Tim; Schumacher, Rahel; Hopfner, Simone; Gutbrod, Klemens; Nyffeler, Thomas; Cazzoli, Dario; Annoni, Jean-Marie; Bohlhalter, Stephan; Müri, René M

    2016-10-01

    The human turn-taking system regulates the smooth and precise exchange of speaking turns during face-to-face interaction. Recent studies investigated the processing of ongoing turns during conversation by measuring the eye movements of noninvolved observers. The findings suggest that humans shift their gaze in anticipation to the next speaker before the start of the next turn. Moreover, there is evidence that the ability to timely detect turn transitions mainly relies on the lexico-syntactic content provided by the conversation. Consequently, patients with aphasia, who often experience deficits in both semantic and syntactic processing, might encounter difficulties to detect and timely shift their gaze at turn transitions. To test this assumption, we presented video vignettes of natural conversations to aphasic patients and healthy controls, while their eye movements were measured. The frequency and latency of event-related gaze shifts, with respect to the end of the current turn in the videos, were compared between the two groups. Our results suggest that, compared with healthy controls, aphasic patients have a reduced probability to shift their gaze at turn transitions but do not show significantly increased gaze shift latencies. In healthy controls, but not in aphasic patients, the probability to shift the gaze at turn transition was increased when the video content of the current turn had a higher lexico-syntactic complexity. Furthermore, the results from voxel-based lesion symptom mapping indicate that the association between lexico-syntactic complexity and gaze shift latency in aphasic patients is predicted by brain lesions located in the posterior branch of the left arcuate fasciculus. Higher lexico-syntactic processing demands seem to lead to a reduced gaze shift probability in aphasic patients. This finding may represent missed opportunities for patients to place their contributions during everyday conversation. PMID:27243612

  14. When advertising turns "cheeky"!

    PubMed

    Burkitt, Jennifer A; Saucier, Deborah M; Thomas, Nicole A; Ehresman, Crystal

    2006-05-01

    Portraits typically exhibit leftward posing biases, with people showing more of their left cheek than their right. The current study investigated posing biases in print advertising to determine whether the product advertised affects the posing bias. As the posing bias may be decreasing over time, we also investigated changes in posing biases over a span of more than 100 years. The current investigation coded 2664 advertisements from two time periods; advertisements were coded for target group of advertisement (men, women, both) and posing bias (rightward, leftward, or central). Unlike other studies that typically observe a leftward posing bias, print advertisements exhibit a rightward posing bias, regardless of time-frame. Thus, print advertisements differ greatly from portraits, which may relate to the purpose of advertisements and the role of attractiveness in advertising. PMID:16644564

  15. Measurement of the car steering wheel turning force of persons with cervical cord injuries.

    PubMed

    Mitarai, K

    1992-06-01

    Steering wheel turning force was measured in persons with cervical cord injuries for evaluation of their ability to drive a car. Seventeen subjects were divided into two groups according to their functional level: Group I (comprising 11 subjects of functional level C6) and Group II (comprising 6 subjects of functional level C7-C8). A device for hand fastening was attached to a steering wheel, which was mounted onto the rotation shaft of a Cybex machine, and the torque for turning the wheel with the right hand at a constant speed was measured. Persons with cervical cord injuries showed characteristically higher left-turning torque than right-turning torque. Mean values and standard deviation of the two groups were: 0.52 +/- 0.16 kgf-m (left-turning) and 0.40 +/- 0.12 kgf-m (right-turning) for Group I; and 0.81 +/- 0.16 kgf-m (left-turning) and 0.76 +/- 0.15 kgf-m (right-turning) for Group II. Subjects in Group I had a turning torque lower than 0.30 kgf-m (the lowest wheel turning torque shown by Japanese cars equipped with a power-steering system) at a turning angle range of between 0-135 degrees in left-turning and 45-200 degrees in right-turning.

  16. Lattice Calibration with Turn-By-Turn BPM Data

    SciTech Connect

    Huang, Xiaobiao; Sebek, James; /SLAC

    2012-07-02

    Turn-by-turn beam position monitor (BPM) data from multiple BPMs are fitted with a tracking code to calibrate magnet strengths in a manner similar to the well known LOCO code. Simulation shows that this turn-by-turn method can be a quick and efficient way for optics calibration. The method is applicable to both linacs and ring accelerators. Experimental results for a section of the SPEAR3 ring is also shown.

  17. Spirit Takes a Turn for Adirondack

    NASA Technical Reports Server (NTRS)

    2004-01-01

    This rear hazard-identification camera image looks back at the circular tracks made in the martian soil when the Mars Exploration Rover Spirit drove about 3 meters (10 feet) toward the mountain-shaped rock called Adirondack, Spirit's first rock target. Spirit made a series of arcing turns totaling approximately 1 meter (3 feet). It then turned in place and made a series of short, straightforward movements totaling approximately 2 meters (6.5 feet). The drive took about 30 minutes to complete, including time stopped to take images. The two rocks in the upper left corner of the image are called 'Sashimi' and 'Sushi.' In the upper right corner is a portion of the lander, now known as the Columbia Memorial Station.

  18. Hummingbirds control turning velocity using body orientation and turning radius using asymmetrical wingbeat kinematics.

    PubMed

    Read, Tyson J G; Segre, Paolo S; Middleton, Kevin M; Altshuler, Douglas L

    2016-03-01

    Turning in flight requires reorientation of force, which birds, bats and insects accomplish either by shifting body position and total force in concert or by using left-right asymmetries in wingbeat kinematics. Although both mechanisms have been observed in multiple species, it is currently unknown how each is used to control changes in trajectory. We addressed this problem by measuring body and wingbeat kinematics as hummingbirds tracked a revolving feeder, and estimating aerodynamic forces using a quasi-steady model. During arcing turns, hummingbirds symmetrically banked the stroke plane of both wings, and the body, into turns, supporting a body-dependent mechanism. However, several wingbeat asymmetries were present during turning, including a higher and flatter outer wingtip path and a lower more deviated inner wingtip path. A quasi-steady analysis of arcing turns performed with different trajectories revealed that changes in radius were associated with asymmetrical kinematics and forces, and changes in velocity were associated with symmetrical kinematics and forces. Collectively, our results indicate that both body-dependent and -independent force orientation mechanisms are available to hummingbirds, and that these kinematic strategies are used to meet the separate aerodynamic challenges posed by changes in velocity and turning radius.

  19. Page turning system

    NASA Technical Reports Server (NTRS)

    Kerley, James J. (Inventor); Eklund, Wayne D. (Inventor)

    1992-01-01

    A device for holding reading materials for use by readers without arm mobility is presented. The device is adapted to hold the reading materials in position for reading with the pages displayed to enable turning by use of a rubber tipped stick that is held in the mouth and has a pair of rectangular frames. The frames are for holding and positioning the reading materials opened in reading posture with the pages displayed at a substantially unobstructed sighting position for reading. The pair of rectangular frames are connected to one another by a hinge so the angle between the frames may be varied thereby varying the inclination of the reading material. A pair of bent spring mounted wires for holding opposing pages of the reading material open for reading without substantial visual interference of the pages is mounted to the base. The wires are also adjustable to the thickness of the reading material and have a variable friction adjustment. This enables the force of the wires against the pages to be varied and permits the reader to manipulate the pages with the stick.

  20. IASI is turning ten!

    NASA Astrophysics Data System (ADS)

    Clerbaux, Cathy; George, Maya; Bauduin, Sophie; Boynard, Anne; Coheur, Pierre-François; Clarisse, Lieven; Crevoisier, Cyril; Doniki, Stamatia; Hadji-Lazaro, Juliette; Hurtmans, Daniel; Lacour, Jean-Lionel; Ronsmans, Gaétane; Safieddine, Sarah; Van Damme, Martin; Wespes, Catherine; Whitburn, Simon

    2016-04-01

    The IASI mission is a versatile mission that fulfills the needs of three different communities: numerical weather prediction, climate research and atmospheric composition monitoring. In order to converge on the design of such an instrument all three communities had to make "reasonable accommodations" 20 years ago, and it turns out that this mission is now recognized as essential for weather forecasting, and for tracking pollutants/greenhouse gases from space. With the launch of MetOp-B and -C and the continuity and new challenges offered by IASI-NG, an exceptional data record will be available in the next few years. The presentation (movie) illustrates some of the major findings related to atmospheric composition changes as monitored by IASI during the last 10 years. It relies on accurate data available in near real time along with an excellent horizontal coverage. We will show the global scale mapping of gases, along with the detection of dust and ash particles, as well as the potential of the mission to catch special events such as volcanic eruptions, large fires and pollution peaks.

  1. Artificial, parallel, left-handed DNA helices.

    PubMed

    Tian, Cheng; Zhang, Chuan; Li, Xiang; Li, Yingmei; Wang, Guansong; Mao, Chengde

    2012-12-19

    This communication reports an engineered DNA architecture. It contains multiple domains of half-turn-long, standard B-DNA duplexes. While each helical domain is right-handed and its two component strands are antiparallel, the global architecture is left-handed and the two component DNA strands are oriented parallel to each other.

  2. Closing left gastroschisis with vanishing left testis.

    PubMed

    Patel, Ramnik V; Sinha, C K; More, Bharat; Rajimwale, Ashok

    2013-01-01

    We report a baby boy with gastroschisis with left non-palpable undescended testis who had a defect on the left side of an intact and normal umbilical cord and had associated testicular atrophy and abnormalities of the ductus deferens. They were successfully managed by primary repair and had uneventful recovery. Subsequent inguinal exploration confirmed blind ending vas deferens and vanishing left undescended testis. Our case confirms vascular accidents at the narrow abdominal wall defect can lead to vanishing testis following attempts at closing gastroschisis making the defect narrow and compromising the blood supply to the testis.

  3. Walking along curved paths of different angles: the relationship between head and trunk turning.

    PubMed

    Sreenivasa, Manish N; Frissen, Ilja; Souman, Jan L; Ernst, Marc O

    2008-11-01

    Walking along a curved path requires coordinated motor actions of the entire body. Here, we investigate the relationship between head and trunk movements during walking. Previous studies have found that the head systematically turns into turns before the trunk does. This has been found to occur at a constant distance rather than at a constant time before a turn. We tested whether this anticipatory head behavior is spatially invariant for turns of different angles. Head and trunk positions and orientations were measured while participants walked around obstacles in 45 degrees, 90 degrees, 135 degrees or 180 degrees turns. The radius of the turns was either imposed or left free. We found that the head started to turn into the direction of the turn at a constant distance before the obstacle (approximately 1.1 m) for turn angles up to 135 degrees . During turns, the head was consistently oriented more into the direction of the turn than the trunk. This difference increased for larger turning angles and reached its maximum later in the turn for larger turns. Walking speeds decreased monotonically for increasing turn angles. Imposing fixed turn radii only affected the point at which the trunk started to turn into a turn. Our results support the view that anticipatory head movements during turns occur in order to gather advance visual information about the trajectory and potential obstacles.

  4. Effects of turning and through lane sharing on traffic performance at intersections

    NASA Astrophysics Data System (ADS)

    Li, Xiang; Sun, Jian-Qiao

    2016-02-01

    Turning vehicles strongly influence traffic flows at intersections. Effective regulation of turning vehicles is important to achieve better traffic performance. This paper studies the impact of lane sharing and turning signals on traffic performance at intersections by using cellular automata. Both right-turn and left-turn lane sharing are studied. Interactions between vehicles and pedestrians are considered. The transportation efficiency, road safety and energy economy are the traffic performance metrics. Extensive simulations are carried out to study the traffic performance indices. It is observed that shared turning lanes and permissive left-turn signal improve the transportation efficiency and reduce the fuel consumption in most cases, but the safety is usually sacrificed. It is not always beneficial for the through vehicles when they are allowed to be in the turning lanes.

  5. Mechanics of left ventricular aneurysm.

    PubMed

    Radhakrishnan, S; Ghista, D N; Jayaraman, G

    1986-01-01

    When a coronary artery is significantly occluded, the left ventricular myocardial segment, which is perfused by that coronary artery, will become ischaemic and even irreversibly infarcted. An acute infarct has very low stiffness and if it involves the entire wall there is a risk of rupture; however, in the absence of such a critical situation, fibrous tissue is laid into the infarcted myocardial segment. Such an infarcted fibrotic myocardial segment will not be able to contract, and so generate tensile stress. The surrounding intact myocardium will contract and generate wall stress, thereby developing a high intra-chamber systolic pressure; the chronically infarcted and fibrotic segment will have to sustain this high chamber pressure. Its loss of contractility and the resulting reduced systolic stiffness relative to the intact segment, will cause it to deform into a bulge; this is an aneurysm. When a left ventricular chamber with an aneurysm contracts during the systolic phase, some blood also goes into the aneurysm, and this decreases the stroke volume; since the aneurysm wall is passive, stagnant blood flow prevails in the aneurysm itself, which in turn can give rise to the formation of a mural thrombus. These serious consequences provide a justification for the analysis of an infarcted left ventricular chamber, in order to predict the size of the aneurysmic bulge. Such an analysis is presented in this paper. To determine the left ventricular wall deformation, and the stress arising from infarction of a wall segment (which leads to a ventricular aneurysm) the left ventricle is modelled here as a pressurized ellipsoidal shell. Deformations of infarcted wall segments are computed for several damaged wall-thicknesses in left ventricles of different shapes. The analysis involves a derivation of equations for wall-stress equilibrium with the chamber pressure, and myocardial incompressibility before and after infarct formation. The equations are solved by the Newton

  6. Mycogen magically turns around agrigenetics

    SciTech Connect

    Kidd, G.

    1995-05-01

    This short article describes how Mycogen, which acquired Agrigenetics/Lubrizol`s seed industry in the 1993, finally turned a profit after drastic sales and brand consolidation updates. Lubrizol is a supplier of lubricant additives to the energy industry. Until Mycogen turned it around, Agrigenetics stood as a stark example of the unfulfilled dreams plaguing agbiotech.

  7. Effects of a continuous lateral turning device on pressure relief.

    PubMed

    Do, Nam Ho; Kim, Deog Young; Kim, Jung-Hoon; Choi, Jong Hyun; Joo, So Young; Kang, Na Kyung; Baek, Yoon Su

    2016-01-01

    [Purpose] The purpose of this study was to examine the pressure-relieving effects of a continuous lateral turning device on common pressure ulcer sites. [Subjects] Twenty-four healthy adults participated. [Methods] The design of our continuous lateral turning device was motivated by the need for an adequate pressure-relieving device for immobile and/or elderly people. The procedure of manual repositioning is embodied in our continuous lateral turning device. The interface pressure and time were measured, and comfort grade was evaluated during sessions of continuous lateral turning at 0°, 15°, 30°, and 45°. We quantified the pressure-relieving effect using peak pressure, mean pressure, and pressure time integration. [Results] Participants demonstrated pressure time integration values below the pressure-time threshold at 15°, 30°, and 45° at all the common pressure ulcer sites. Moreover, the most effective angles for pressure relief at the common pressure ulcer sites were 30° at the occiput, 15° at the left scapula, 45° at the right scapula, 45° at the sacrum, 15° at the right heel, and 30° at the left heel. However, angles greater than 30° induced discomfort. [Conclusion] Continuous lateral turning with our specially designed device effectively relieved the pressure of targeted sites. Moreover, the suggested angles of continuous lateral turning can be used to relieve pressure at targeted sites. PMID:27065531

  8. Effects of a continuous lateral turning device on pressure relief

    PubMed Central

    Do, Nam Ho; Kim, Deog Young; Kim, Jung-Hoon; Choi, Jong Hyun; Joo, So Young; Kang, Na Kyung; Baek, Yoon Su

    2016-01-01

    [Purpose] The purpose of this study was to examine the pressure-relieving effects of a continuous lateral turning device on common pressure ulcer sites. [Subjects] Twenty-four healthy adults participated. [Methods] The design of our continuous lateral turning device was motivated by the need for an adequate pressure-relieving device for immobile and/or elderly people. The procedure of manual repositioning is embodied in our continuous lateral turning device. The interface pressure and time were measured, and comfort grade was evaluated during sessions of continuous lateral turning at 0°, 15°, 30°, and 45°. We quantified the pressure-relieving effect using peak pressure, mean pressure, and pressure time integration. [Results] Participants demonstrated pressure time integration values below the pressure-time threshold at 15°, 30°, and 45° at all the common pressure ulcer sites. Moreover, the most effective angles for pressure relief at the common pressure ulcer sites were 30° at the occiput, 15° at the left scapula, 45° at the right scapula, 45° at the sacrum, 15° at the right heel, and 30° at the left heel. However, angles greater than 30° induced discomfort. [Conclusion] Continuous lateral turning with our specially designed device effectively relieved the pressure of targeted sites. Moreover, the suggested angles of continuous lateral turning can be used to relieve pressure at targeted sites. PMID:27065531

  9. Tune Evaluation From Phased BPM Turn-By-Turn Data

    SciTech Connect

    Alexahin, Y.; Gianfelice-Wendt, E.; Marsh, W.; /Fermilab

    2010-05-18

    In fast ramping synchrotrons like the Fermilab Booster the conventional methods of betatron tune evaluation from the turn-by-turn data may not work due to rapid changes of the tunes (sometimes in a course of a few dozens of turns) and a high level of noise. We propose a technique based on phasing of signals from a large number of BPMs which significantly increases the signal to noise ratio. Implementation of the method in the Fermilab Booster control system is described and some measurement results are presented.

  10. Turning collectors for solar radiation

    DOEpatents

    Barak, Amitzur Z.

    1976-01-01

    A device is provided for turning a solar collector about the polar axis so that the collector is directed toward the sun as the sun tracks the sky each day. It includes two heat-expansive elements and a shadow plate. In the morning a first expansive element is heated, expands to turn the collector to face the sun, while the second expansive element is shaded by the plate. In the afternoon the second element is heated, expands to turn the collector to face the sun, while the first is shaded by the plate.

  11. MHD plant turn down considerations

    SciTech Connect

    Lineberry, J.T.; Chapman, J.N.

    1991-01-01

    The topic of part load operation of the MHD power plant is assessed. Current and future planned MHD research is reviewed in terms of addressing topping and bottoming cycle integration needs. The response of the MHD generator to turn up and down scenarios is reviewed. The concept of turning the MHD power to met changes in plant load is discussed. The need for new ideas and focused research to study MHD plant integration and problems of plant turn down and up is cited. 7 refs., 5 figs., 1 tab.

  12. Turning assistive machines into assistive robots

    NASA Astrophysics Data System (ADS)

    Argall, Brenna D.

    2015-01-01

    For decades, the potential for automation in particular, in the form of smart wheelchairs to aid those with motor, or cognitive, impairments has been recognized. It is a paradox that often the more severe a person's motor impairment, the more challenging it is for them to operate the very assistive machines which might enhance their quality of life. A primary aim of my lab is to address this confound by incorporating robotics autonomy and intelligence into assistive machines turning the machine into a kind of robot, and offloading some of the control burden from the user. Robots already synthetically sense, act in and reason about the world, and these technologies can be leveraged to help bridge the gap left by sensory, motor or cognitive impairments in the users of assistive machines. This paper overviews some of the ongoing projects in my lab, which strives to advance human ability through robotics autonomy.

  13. Turning around Newton's Second Law

    ERIC Educational Resources Information Center

    Goff, John Eric

    2004-01-01

    Conceptual and quantitative difficulties surrounding Newton's second law often arise among introductory physics students. Simply turning around how one expresses Newton's second law may assist students in their understanding of a deceptively simple-looking equation.

  14. [Left-handed painters].

    PubMed

    Lanthony, P

    1995-03-01

    The role of the right hemisphere in the building of our visual space is now well established. The purpose of the present research was to determine the proportion of left handed painters, and to identify famous painters which were left-handed. The methods were as follows. First, the study of the portraits of the painters; but self-portraits were worthless (right-handed painters often painting themself as observed in the mirror, i.e. left-handed). Therefore, only portraits of painters made by another painter or by photography were used. Secondly, the orientation of the hatchings used by the artist for the representation of the shadows in the drawing: the right-handed artist making hatchings descending from right to left, and the left-handed artist making hatchings descending from left to right. Thirdly, the study of the relevant literature about history of art. The studied population included 500 painters divided in two groups: a population of 127 painters studied by portraits and hatchings; and a population of 373 painters studied only by hatchings. In the first population, the proportion of left-handed painters was 4.7%. In the second population, the proportion of left-handed painters was 2.1%. Among the 500 painters they were 14 left-handed subjects, i.e. 2.8%. These 14 painters were, in alphabetical order: Cambiaso, Dufy, Escher, Füssli, Grandville, Holbein, Klee, De La Patellière, Léonard de Vinci, Menzel, Montelupo, Papety, Regnault, Van Goyen.(ABSTRACT TRUNCATED AT 250 WORDS)

  15. Magnet Coil Shorted Turn Detector

    SciTech Connect

    Dinkel, J.A.; Biggs, J.E.

    1994-03-01

    The Magnet Coil Shorted Turn Detector has been developed to facilitate the location of shorted turns in magnet coils. Finding these shorted turns is necessary to determine failure modes that are a necessary step in developing future production techniques. Up to this point, coils with shorted turns had the insulation burned off without the fault having been located. This disassembly process destroyed any chance of being able to find the fault. In order to maintain a flux balance in a coupled system such as a magnet coil, the current in a shorted turn must be opposed to the incident current. If the direction of the current in each conductor can be measured relative to the incident current, then the exact location of the short can be determined. In this device, an AC voltage is applied to the magnet under test. A small hand held B-dot pickup coil monitors the magnetic field produced by current in the individual magnet conductors. The relative phase of this pickup coil voltage is compared to a reference signal derived from the input current to detect a current reversal as the B-dot pickup coil is swept over the conductors of the coil under test. This technique however, is limited to only those conductors that are accessible to the hand held probe.

  16. Left heart catheterization

    MedlinePlus

    Catheterization - left heart ... to help guide the catheters up into your heart and arteries. Dye will be injected into your ... in the blood vessels that lead to your heart. The catheter is then moved through the aortic ...

  17. Left-Handed Connections.

    ERIC Educational Resources Information Center

    Lipson, Alice M.

    1984-01-01

    The following aspects of left-handedness are discussed: etiology and associated learning and developmental disorders; right-brain dominance and how to detect it; adaptations to the physical learning environment; behavior patterns; and teaching techniques. (JW)

  18. Left heart ventricular angiography

    MedlinePlus

    ... through the left side of the heart. Blood volumes and pressures are also normal. ... of the catheter Heart failure due to the volume of the dye Infection Kidney failure from the dye Low blood pressure Heart attack Hemorrhage Stroke

  19. Design, Synthesis, and Conformational Analysis of Proposed β-Turn Mimics from Isoxazoline-Cyclopentane Aminols.

    PubMed

    Memeo, Misal Giuseppe; Mella, Mariella; Montagna, Valentina; Quadrelli, Paolo

    2015-11-01

    Constrained aminols from oxazanorbornene derivatives have the geometrical features to be used as β-turn inducers. Four different stereoisomers were prepared and spectroscopically characterized (MD calculations, NMR-titration and VT-NMR experiments). Temperature coefficients in DMSO are indicative for the existence of an intramolecular hydrogen bond. Chirooptical properties revealed a β-turn arrangement of all the synthesized compounds, where, depending on the absolute configuration of the cyclopentane spacer, they can be labeled as left- or right-handed turns.

  20. Wrong Turn on School Reform

    ERIC Educational Resources Information Center

    Hess, Frederick M.; Petrilli, Michael J.

    2009-01-01

    In the run-up to the 2000 presidential election, candidate George W. Bush and his advisors made a strategic decision to appropriate educational rhetoric generally associated with Democrats and the left. This decision helped Bush present himself as "different kind of Republican" and a "compassionate conservative" and to dramatically narrow the…

  1. Professional Employees Turn to Unions

    ERIC Educational Resources Information Center

    Chamot, Dennis

    1976-01-01

    White-collar and professional employees are increasingly turning to unions to combat their loss of independence as employees of large organizations. Managers should realize that they and professional employees have different viewpoints about job situations and that the current trend toward white-collar unionism is apt to continue. (JG)

  2. Quixote's Visor: A Rhetorical Turn.

    ERIC Educational Resources Information Center

    Green, William H.

    1998-01-01

    Discusses "Quixote's visor," a rhetorical turn that conceals a logical gap, an appeal to frustration or necessity. Suggests that the form of Quixote's visor, the testing of a series of possibilities, is a way of deriving logical and rhetorical inferences in response to acts of questioning. Discusses two "cousins"--Sherlock's visor and Darwin's…

  3. The Physics of Ski Turns

    ERIC Educational Resources Information Center

    Shonle, John I.; Nordick, Douglas L.

    1972-01-01

    Describes the application of basic dynamics of rotations to the case of turning on skis, first without and then with external torques. Various elements are combined in different techniques and suggestions for further extensions and a list of laboratory exercises based on skiing are included. (DF)

  4. Hypoplastic left heart syndrome (image)

    MedlinePlus

    Hypoplastic left heart syndrome is a congenital heart condition that occurs during the development of the heart in the ... womb. During the heart's development, parts of the left side of the heart (mitral valve, left ventricle ...

  5. Eye and head motion during head turns in spaceflight

    NASA Technical Reports Server (NTRS)

    Thornton, William E.; Uri, John J.; Moore, Thomas P.; Pool, Sam L.

    1988-01-01

    Eye-head motion was studied pre-, in- and postflight during single voluntary head turns. A transient increase in vestibulo-ocular reflex (VOR) gain occurred early in the flight, but later trended toward normal. This increased gain was produced by a relative increase in eye counterrotation velocity. Asymmetries in gain with right and left turns also occurred, caused by asymmetries in eye counterrotation velocities. These findings were remarkably similar to those from Soviet primate studies using gaze fixation targets, except the human study trended more rapidly toward normal. These findings differ substantially from those measuring VOR gain by head oscillation, in which no significant changes were found inflight. No visual disturbances were noted in either test condition or in normal activities. These head turn studies are the only ones to date documenting any functional change in VOR in weightlessness.

  6. Diamond turning machine controller implementation

    SciTech Connect

    Garrard, K.P.; Taylor, L.W.; Knight, B.F.; Fornaro, R.J.

    1988-12-01

    The standard controller for a Pnuemo ASG 2500 Diamond Turning Machine, an Allen Bradley 8200, has been replaced with a custom high-performance design. This controller consists of four major components. Axis position feedback information is provided by a Zygo Axiom 2/20 laser interferometer with 0.1 micro-inch resolution. Hardware interface logic couples the computers digital and analog I/O channels to the diamond turning machine`s analog motor controllers, the laser interferometer, and other machine status and control information. It also provides front panel switches for operator override of the computer controller and implement the emergency stop sequence. The remaining two components, the control computer hardware and software, are discussed in detail below.

  7. Diamond turning of thermoplastic polymers

    SciTech Connect

    Smith, E.; Scattergood, R.O.

    1988-12-01

    Single point diamond turning studies were made using a series of thermoplastic polymers with different glass transition temperatures. Variations in surface morphology and surface roughness were observed as a function of cutting speed. Lower glass transition temperatures facilitate smoother surface cuts and better surface finish. This can be attributed to the frictional heating that occurs during machining. Because of the very low glass transition temperatures in polymeric compared to inorganic glasses, the precision machining response can be very speed sensitive.

  8. Bacteria turn a tiny gear

    SciTech Connect

    2009-01-01

    Thousands of tiny Bacillus subtillis bacteria turn a single gear, just 380 microns across. (A human hair is about 100 microns across.) The method could be used to create micro-machines. Argonne National Laboratory scientist Igor Aronson pioneered this technique. Read more at the New York Times: http://ow.ly/ODfI or at Argonne: http://ow.ly/ODfa Video courtesy Igor Aronson.

  9. Turning points in reactor design

    SciTech Connect

    Beckjord, E.S.

    1995-09-01

    This article provides some historical aspects on nuclear reactor design, beginning with PWR development for Naval Propulsion and the first commercial application at Yankee Rowe. Five turning points in reactor design and some safety problems associated with them are reviewed: (1) stability of Dresden-1, (2) ECCS, (3) PRA, (4) TMI-2, and (5) advanced passive LWR designs. While the emphasis is on the thermal-hydraulic aspects, the discussion is also about reactor systems.

  10. The Children Left Behind

    ERIC Educational Resources Information Center

    Gillard, Sarah A.; Gillard, Sharlett

    2012-01-01

    This article explores some of the deficits in our educational system in regard to non-hearing students. It has become agonizingly clear that non-hearing students are being left out of the gallant sweep to enrich our children's educations. The big five areas of literacy, at best, present unique challenges for non-hearing students and, in some…

  11. Accountability Left Behind

    ERIC Educational Resources Information Center

    Testani, Rocco E.; Mayes, Joshua A.

    2008-01-01

    This article describes the reversal of the dismissal of an "unfunded-mandates" challenge to the No Child Left Behind Act (NCLB) brought by the National Education Association (NEA), several of its affiliates, and a number of school districts by the United States Court of Appeals for the Sixth Circuit. The decision in "School District of the City of…

  12. No Baby Left behind

    ERIC Educational Resources Information Center

    Blanton, Dorothy

    2007-01-01

    "No Baby Left Behind" was created to have an impact on the school readiness of children in the community today and in the future. Each year, there are an increasing number of students who have learning difficulties. Many of these problems are preventable. Accidents, poor nutrition (of the mother and/or child), drug use, alcohol use, and lack of…

  13. No Adult Left Behind

    ERIC Educational Resources Information Center

    Arndt, Jason

    2010-01-01

    Left out of the conversation for education reform, at least on the level of grade school, secondary school, and college are the adult education programs provided across the country. These programs receive a fraction of the funds and respect as mainstream programs do. However, they are sorely needed in Northwest Indiana. The region's early 21st…

  14. No Cow Left Behind

    ERIC Educational Resources Information Center

    Remsen, Kenneth A.

    2004-01-01

    As a principal facing the task of figuring out all the complexities of the No Child Left Behind legislation, Kenneth Remsen, has concluded there is a strong belief that testing students is the answer to bringing about improvements in student performance. Because testing seems to be a cornerstone to improving performance, he doesn't understand why…

  15. No School Left Unscathed

    ERIC Educational Resources Information Center

    Allen, Tom

    2004-01-01

    The author maintains that the No Child Left Behind (NCLB) Act of 2001 brands good schools with "failing" labels, places the heaviest burdens on states that were already striving to meet challenging education goals, imposes inflexible rules, and fails to make good on promises to pay for programs that would help struggling schools meet the demands…

  16. When Is It My Turn To Speak?

    ERIC Educational Resources Information Center

    Orestrom, Bengt

    A study analyzed four dyadic conversations for evidence of the signals operating in the turn-taking process and facilitating the smooth exchange of turns. It found over 20 syntactic, prosodic, and semantic features occurring frequently with turn-taking. The five most significant factors correlating with turn-taking were a prosodically completed…

  17. Left Atrial Drainage of a Persistent Left Superior Vena Cava.

    PubMed

    Yousaf, Muhammad; Malak, Sharp F

    2008-01-01

    Although the most common form of the persistent left superior vena cava anomaly is usually clinically silent and often discovered incidentally, the risk of developing cyanosis, heart failure, and embolic cerebrovascular events is high among cases where the anomaly causes a right to left shunt. A rare case of persistent left superior vena cava draining into the left atrium through the superior left pulmonary vein is presented with a discussion of the embryology, morphologic forms, and clinical significance of the persistent left superior vena cava.

  18. A small island Taiwan makes a remote typhoon turn

    NASA Astrophysics Data System (ADS)

    Nakata, K.; Tachibana, Y.; Komatsu, K.; Hara, M.; Yamazaki, K.; Kodera, K.

    2015-12-01

    Typhoon (TC) Talas (2011), which caused Japan catastrophic disaster, landed the western part of Japan. The TC suddenly turned northwestward, and then landed on Japan. A reason for the occurrence of the disaster is that Japan Meteorological Agency (JMA) failed to predict the TC's sudden left turn, JMA predicted that the TC would not turn northwestward but would move northeastward. The actual course was opposite to the JMA numerical weather prediction. The timing when the TC started to turn northwestward was the same as another TC, Nanmadol, crossed Taiwan Island. Here we find that whether TC Nanmadol landed Taiwan Island or not determines whether the TC Talas turned left or not. If Nanmadol had not landed on Taiwan, Talas would not have landed on Japan. A small island controls the course of a remote TC. Therefore, the presence of the Island of Taiwan is important for the determination of the course of a typhoon. The utilization of two-way Weather Research and Forecasting (WRF) simulation with moving nesting, which allows the influence of a TC upon surrounding environmental large-scale atmospheric flow in comparison with one-way moving nesting shows that Talas remotely strengthened the subtropical high located to the east of Talas. This strengthened subtropical high somewhat blocked the eastward movement of Talas. In addition, Nanmadol remotely strengthened the high pressure system that was between Talas and Nanmadol. This strengthened high blocked westward movement of the Talas. The WRF showed that the deeper the typhoon developed, the stronger the high pressure system. When Nanmadol landed Taiwan, this remote strengthening of the high suddenly weakened because of decay of landed Nanmadol. The weakened high no longer blocked the westward movement of Talas. Therefore, Talas started to turn westward when Nanmadol landed on Taiwan. In some WRF members without landed on Taiwan, neither Nanmadol nor the high between Talas and Nanmadol did weakened. Also, Talas did not

  19. Locomotor Trajectories of Stroke Patients during Oriented Gait and Turning

    PubMed Central

    Van Hamme, Angele; Bensmail, Djamel

    2016-01-01

    Background The Timed Up and Go (TUG) test is widely used to assess locomotion in patients with stroke and is considered to predict the risk of falls. The analysis of locomotor trajectories during the TUG appears pertinent in stroke patients. The aims of this study were i) to analyze locomotor trajectories in patients with stroke during the walking and turning sub-tasks of the TUG, and to compare them with healthy subjects, ii) to determine whether trajectory parameters provide additional information to that provided by the conventional measure (performance time), iii) to compare the trajectory parameters of fallers and non-fallers with stroke and of patients with right and left hemisphere stroke, and iv) to evaluate correlations between trajectory parameters and Berg Balance Scale scores. Methods 29 patients with stroke (mean age 54.2±12.2 years, 18 men, 8 fallers) and 25 healthy subjects (mean age 51.6±8.7 years, 11 men) underwent three-dimensional analysis of the TUG. The trajectory of the center of mass was analyzed by calculation of the global trajectory length, Hausdorff distance and Dynamic Time Warping. The parameters were compared with a reference trajectory during the total task and each sub-task (Go, Turn, Return) of the TUG. Results Values of trajectory parameters were significantly higher for the stroke group during the total TUG and the Go and Turn sub-tasks (p<0.05). Moreover, logistic regression indicated that these parameters better discriminated stroke patients and healthy subjects than the conventional timed performance during the Go sub-task. In addition, fallers were distinguished by higher Dynamic Time Warping during the Go (p<0.05). There were no differences between patients with right and left hemisphere stroke. Discussion and Conclusion The trajectories of the stroke patients were longer and more deviated during the turn and the preceding phase. Trajectory parameters provided additional information to timed performance of this locomotor

  20. Close view looking to left side of statue showing left ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Close view looking to left side of statue showing left hand, shield, and laurel wreath - U.S. Capitol, Statue of Freedom, Intersection of North, South, & East Capitol Streets & Capitol Mall, Washington, District of Columbia, DC

  1. Left ventricular pseudoaneurysm perceived as a left lung mass

    PubMed Central

    Yaliniz, Hafize; Gocen, Ugur; Atalay, Atakan; Salih, Orhan Kemal

    2016-01-01

    Left ventricular pseudoaneurysm is a rare complication of aneurysmectomy. We present a case of a surgically treated left ventricular pseudoaneurysm, which was diagnosed three years after coronary artery bypass grafting and left ventricular aneurysmectomy. The presenting symptoms, diagnostic evaluation, and surgical repair are described. PMID:27516793

  2. Percutaneous left ventricular restoration.

    PubMed

    Ige, Mobolaji; Al-Kindi, Sadeer G; Attizzani, Guilherme; Costa, Marco; Oliveira, Guilherme H

    2015-04-01

    The ventricular partitioning device known as Parachute is the first and only percutaneously implantable device aimed at restoration of normal left ventricular geometry in humans. Since its conception, this technology has undergone extensive animal and human testing, with proved feasibility and safety, and is currently being studied in a pivotal randomized clinical trial. This article discusses ventricular remodeling and therapies attempted in the past, details the components of the ventricular partitioning device, describes the implanting technique, and reviews the most current experience of this device in humans.

  3. Percutaneous left ventricular restoration.

    PubMed

    Ige, Mobolaji; Al-Kindi, Sadeer G; Attizzani, Guilherme; Costa, Marco; Oliveira, Guilherme H

    2015-04-01

    The ventricular partitioning device known as Parachute is the first and only percutaneously implantable device aimed at restoration of normal left ventricular geometry in humans. Since its conception, this technology has undergone extensive animal and human testing, with proved feasibility and safety, and is currently being studied in a pivotal randomized clinical trial. This article discusses ventricular remodeling and therapies attempted in the past, details the components of the ventricular partitioning device, describes the implanting technique, and reviews the most current experience of this device in humans. PMID:25834974

  4. Polishing and testing of aspheric diamond-turned surfaces

    NASA Astrophysics Data System (ADS)

    Parks, R. E.

    The techniques used for polishing and testing optical components fabricated on single-point diamond turning machines are reviewed. Optical polishing techniques in the past have employed cerium oxide based and aluminum oxide based polishing compounds for polishing crystals and metals, whereas diamond compounds have currently replaced the aluminum materials. A slurry with a water medium was most common, except for X ray microscope and telescope components, which required a silicon oil. Endless belt laps have been employed to eliminate the microripple left by diamond turning. Further studies have indicated that ripple with a spatial frequency greater than 1 mm cannot be removed. Further work to characterize polishing materials with a higher melting point than high-melting point mirror surfaces is suggested, together with defining a suitable lap design for a large work surface area. Finally, surface metrology techniques are discussed.

  5. 32 CFR 935.135 - Turns.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 6 2010-07-01 2010-07-01 false Turns. 935.135 Section 935.135 National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE TERRITORIAL AND INSULAR REGULATIONS WAKE ISLAND CODE Motor Vehicle Code § 935.135 Turns. (a) Each person making a right turn in a motor vehicle shall make the approach and turn as close...

  6. 33 CFR 401.48 - Turning basins.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 3 2011-07-01 2011-07-01 false Turning basins. 401.48 Section... TRANSPORTATION SEAWAY REGULATIONS AND RULES Regulations Seaway Navigation § 401.48 Turning basins. No vessel... the locations set out in the table to this section. Table 1. South Shore Canal: (a) Turning Basin...

  7. 33 CFR 401.48 - Turning basins.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Turning basins. 401.48 Section... TRANSPORTATION SEAWAY REGULATIONS AND RULES Regulations Seaway Navigation § 401.48 Turning basins. No vessel... the locations set out in the table to this section. Table 1. South Shore Canal: (a) Turning Basin...

  8. As the Third World turns.

    PubMed

    Hagerman, E

    1991-01-01

    Throughout the 3rd World, family planners have turned to television in order to spread their message. Combining education and entertainment in the form of advertisements and soap operas, television offers a way to provide clear and memorable information about an otherwise sensitive issue. In 1977, Mexico's Miguel Sabido developed the idea of using television as a means of social instruction. His initial soap opera dealt with adult literacy, and the success of that program led him to develop a show focusing on family planning called "Come Along with Me." Following the airing of this soap opera, attendance to family planning clinics increased by 32%. Since then, Mexico has produced a series of soap operas dealing with sex education, women's status, and the treatment of children. Soon, Mexican viewers will see a soap opera addressing the issue of AIDS. Family planners in other countries have also begun employing television. Conventional communication methods require trained counselors travelling villages, and most often, those most in need of family planning are the most difficult to reach. But over the last 10 years, the number of televisions in the Third World has doubled, and there is now approximately 1 television for every 12 people in the developing nations. In Turkey, advertisements have been used to promote modern methods of contraception. In Brazil, vasectomy has been one of the topics of ad campaigns. Mexico, the Philippines, and Nigeria have also experimented with the use of music videos. Nigeria has already had great success in integrating family planning themes to an already existing variety show. Family planning visits have increased by 47%. International agencies have recognized the value of television and have provided financial support.

  9. Acute ileofemoral artery thromboembolism due to left ventricle thrombi with spontaneous coronary artery dissection

    PubMed Central

    Jun, Heungman; Jung, Cheol-Woong

    2015-01-01

    Spontaneous coronary artery dissection (SCAD) is a very rare cause of peripheral artery thromboembolism. It is especially rare to show symptoms of acute limb ischemia without chest symptoms during a hospital visit. In this case, a rare case of SCAD led to left heart failure and caused left ventricle thrombi, which in turn caused peripheral thromboembolism. PMID:25553326

  10. [Left ventricular rotation and twist of the heart. Clarification of some concepts].

    PubMed

    Nemes, Attila; Kalapos, Anita; Domsik, Péter; Forster, Tamás

    2012-09-30

    In case of a healthy heart basal part of the left ventricle rotates clockwise in systole, while the apex rotates counter-clockwise. This sort of squeezing-turning motion is called "twisting" of the heart. The aim of the current review is to summarize knowledge regarding left ventricular rotation and twist as well as methodological aspects of their evaluation.

  11. Gasdynamic evaluation of choking cascade turns

    NASA Astrophysics Data System (ADS)

    Perez, D. R.

    1984-12-01

    Uses for ram air in airborne vehicles are increasing along with the need for sophisticated ducting of the compressed air. Inlets operating supercritically, a normal shock in the subsonic diffuser, and use an aerodynamic grid to control the normal shock position to a region of low total pressure losses are discussed. Turning of the flow requires long radius curves to maintain the total pressure. This study combines the internal shock positioning and flow turning into a flow choking cascade turn with a short radius. Several sets of 90 degree turning sections, for turning compressed air, were selected, designed, and tested gas dynamically. Two of the turn sections were totally subsonic and only turned the air flow. Two other sections turned and choked the flow during supercritical inlet operation. These flow controllers perform the same function as an aerodynamic grid and flow turning vanes used in current internal compressible airflow designs. These tests correlated the suitability of using a water table versus a gas dynamic apparatus for determining the flow control capabilities and pressure recovery of the cascades. The subsonic only turning section gave the best pressure recovery and total pressure distribution along the turning axis, but allowed the supercritical internal shock to move towards large shock/boundary layer interaction. The two shock positioning cascades provided good internal shock control with only slightly lower pressure recovery. Further investigation is needed for the effects of back pressure fluctuations on the flow dynamics.

  12. [Left-handedness and health].

    PubMed

    Milenković, Sanja; Belojević, Goran; Kocijancić, Radojka

    2010-01-01

    Hand dominance is defined as a proneness to use one hand rather than another in performing the majority of activities and this is the most obvious example of cerebral lateralization and an exclusive human characteristic. Left-handed people comprise 6-14% of the total population, while in Serbia, this percentage is 5-10%, moving from undeveloped to developed environments, where a socio-cultural pressure is less present. There is no agreement between investigators who in fact may be considered a left-handed person, about the percentage of left-handers in the population and about the etiology of left-handedness. In the scientific literature left-handedness has been related to health disorders (spine deformities, immunological disorders, migraine, neurosis, depressive psychosis, schizophrenia, insomnia, homosexuality, diabetes mellitus, arterial hypertension, sleep apnea, enuresis nocturna and Down Syndrome), developmental disorders (autism, dislexia and sttutering) and traumatism. The most reliable scientific evidences have been published about the relationship between left-handedness and spinal deformities in school children in puberty and with traumatism in general population. The controversy of other results in up-to-now investigations of health aspects of left-handedness may partly be explained by a scientific disagreement whether writing with the left hand is a sufficient criterium for left-handedness, or is it necessary to investigate other parameters for laterality assessment. Explanation of health aspects of left-handedness is dominantly based on Geschwind-Galaburda model about "anomalous" cerebral domination, as a consequence of hormonal disbalance.

  13. Ribbon structure stabilized by C10 and C12 turns in αγ hybrid peptide.

    PubMed

    Wani, Naiem Ahmad; Kant, Rajni; Gupta, Vivek Kumar; Aravinda, Subrayashastry; Rai, Rajkishor

    2016-04-01

    The present study describes the synthesis and crystallographic analysis of αγ hybrid peptides, Boc-Gpn-L-Pro-NHMe (1), Boc-Aib-Gpn-L-Pro-NHMe (2), and Boc-L-Pro-Aib-Gpn-L-Pro-NHMe (3). Peptides 1 and 2 adopt expanded 12-membered (C12 ) helical turn over γα segment. Peptide 3 promotes the ribbon structure stabilized by type II β-turn (C10 ) followed by the expanded C12 helical γα turn. Both right-handed and left-handed helical conformations for Aib residue are observed in peptides 2 and 3, respectively.

  14. Overlapping left ventricular restoration.

    PubMed

    Matsui, Yoshiro

    2009-06-01

    Cardiac transplantation, a final option of treatment for refractory heart failure, has not been a standard procedure in Japan especially, mainly because of the shortage of donors. However, surgical methods to restore native heart function, such as surgical ventricular restoration (SVR), are often effective for these cases. The Dor procedure has been used for ischemic cardiomyopathy cases presenting with broad akinetic segments. This is a fine method to exclude the scarred septum and to reduce the intraventricular cavity by encircling purse-string suture, but it may produce a postoperative spherical ventricular shape as a result of endoventricular patch repair. Also, partial left ventriculectomy is not recommended for non-ischemic dilated cardiomyopathy cases for now. A modification of these SVR and surgical approaches to functional mitral regurgitation has been named "overlapping ventriculoplasty" without endoventricular patch and resection of viable cardiac muscle, and "mitral complex reconstruction", which consists of mitral annuloplasty, papillary muscle approximation, and suspension. Although the long-term prognosis of these procedures is undetermined, they could be an important option, at least as an alternative bridge to transplantation. This review will describe the concepts and some technical aspects of these procedures for the end-stage heart. PMID:19474505

  15. Left atrial appendage occlusion.

    PubMed

    Alli, Oluseun; Holmes, David

    2015-06-01

    Left atrial appendage (LAA) occlusion for stroke and thromboembolism prevention in patients with atrial fibrillation (AF) represents a significant advancement in the field of cardiovascular disease. Prevention and avoidance of the devastating consequences of thromboembolic complications from AF continues to be central in the management of these patients. The role of LAA as a nidus for thrombus formation is well documented. Multiple approaches to exclude the LAA from the circulation either percutaneously or surgically have been described and are undergoing testing. Although pharmacological therapy for stroke prevention remains the cornerstone of treatment, device and surgical exclusion of the LAA have proven to be viable alternatives in carefully selected patients. Even though current evidence show that LAA occlusion is safe and effective, approval and adoption of this strategy has been quite difficult due to paucity of randomised clinical trial data on the risk and benefit ratio, cost effectiveness and the issues of procedural risk as well as longer-term outcome. This review aims to provide an update on the current status of LAA occlusion, specifically looking at interpretation of current clinical data, available techniques and devices, issues with current devices and future direction. PMID:25518846

  16. Turning the School Around: The Transformation of a Secondary School from Underperforming to Highly Achieving

    ERIC Educational Resources Information Center

    Branch, Cynthia Monroe

    2013-01-01

    The No Child Left Behind Act of 2001 put a focus on each child in a school being proficient. Since 1957 when Sputnik was launched, the United States has been attempting to improve its schools. The existing literature has a gap as to how to turn around an underperforming school in a fairly short period of time. A qualitative case study methodology…

  17. 1. Postandbeam garage (far left), oneroom log cabin (left of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Post-and-beam garage (far left), one-room log cabin (left of center), house (right of center), garden shed and outhouse (far right). View to west-southwest. - William & Lucina Bowe Ranch, County Road 44, 0.1 mile northeast of Big Hole River Bridge, Melrose, Silver Bow County, MT

  18. 3. Log bunkhouse (far left), log chicken house (left of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Log bunkhouse (far left), log chicken house (left of center), equipment shed (center), and workshop (far right). View to northwest. - William & Lucina Bowe Ranch, County Road 44, 0.1 mile northeast of Big Hole River Bridge, Melrose, Silver Bow County, MT

  19. 6. Livestock barn (far left), log drafthorse barn (left of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. Livestock barn (far left), log draft-horse barn (left of center), loafing shed (center), log calving barn (right of center). View to west-northwest. - William & Lucina Bowe Ranch, County Road 44, 0.1 mile northeast of Big Hole River Bridge, Melrose, Silver Bow County, MT

  20. Realistic page-turning of electronic books

    NASA Astrophysics Data System (ADS)

    Fan, Chaoran; Li, Haisheng; Bai, Yannan

    2014-01-01

    The booming electronic books (e-books), as an extension to the paper book, are popular with readers. Recently, many efforts are put into the realistic page-turning simulation o f e-book to improve its reading experience. This paper presents a new 3D page-turning simulation approach, which employs piecewise time-dependent cylindrical surfaces to describe the turning page and constructs smooth transition method between time-dependent cylinders. The page-turning animation is produced by sequentially mapping the turning page into the cylinders with different radii and positions. Compared to the previous approaches, our method is able to imitate various effects efficiently and obtains more natural animation of turning page.

  1. Classifying Step and Spin Turns Using Wireless Gyroscopes and Implications for Fall Risk Assessments

    PubMed Central

    Fino, Peter C.; Frames, Christopher W.; Lockhart, Thurmon E.

    2015-01-01

    Recent studies have reported a greater prevalence of spin turns, which are more unstable than step turns, in older adults compared to young adults in laboratory settings. Currently, turning strategies can only be identified through visual observation, either in-person or through video. This paper presents two unique methods and their combination to remotely monitor turning behavior using three uniaxial gyroscopes. Five young adults performed 90° turns at slow, normal, and fast walking speeds around a variety of obstacles while instrumented with three IMUs (attached on the trunk, left and right shank). Raw data from 360 trials were analyzed. Compared to visual classification, the two IMU methods’ sensitivity/specificity to detecting spin turns were 76.1%/76.7% and 76.1%/84.4%, respectively. When the two methods were combined, the IMU had an overall 86.8% sensitivity and 92.2% specificity, with 89.4%/100% sensitivity/specificity at slow speeds. This combined method can be implemented into wireless fall prevention systems and used to identify increased use of spin turns. This method allows for longitudinal monitoring of turning strategies and allows researchers to test for potential associations between the frequency of spin turns and clinically relevant outcomes (e.g., falls) in non-laboratory settings. PMID:25954950

  2. Causal Role of Motor Simulation in Turn-Taking Behavior

    PubMed Central

    Novembre, Giacomo; Keller, Peter E.; Pickering, Martin J.

    2015-01-01

    Overlap between sensory and motor representations has been documented for a range of human actions, from grasping (Rizzolatti et al., 1996b) to playing a musical instrument (Novembre and Keller, 2014). Such overlap suggests that individuals use motor simulation to predict the outcome of observed actions (Wolpert, 1997). Here we investigate motor simulation as a basis of human communication. Using a musical turn-taking task, we show that pianists call on motor representations of their partner's part to predict when to come in for their own turn. Pianists played alternating solos with a videoed partner, and double-pulse transcranial magnetic stimulation was applied around the turn-switch to temporarily disrupt processing in two cortical regions implicated previously in different forms of motor simulation: (1) the dorsal premotor cortex (dPMC), associated with automatic motor resonance during passive observation of hand actions, especially when the actions are familiar (Lahav et al., 2007); and (2) the supplementary motor area (SMA), involved in active motor imagery, especially when the actions are familiar (Baumann et al., 2007). Stimulation of the right dPMC decreased the temporal accuracy of pianists' (right-hand) entries relative to sham when the partner's (left-hand) part had been rehearsed previously. This effect did not occur for dPMC stimulation without rehearsal or for SMA stimulation. These findings support the role of the dPMC in predicting the time course of observed actions via resonance-based motor simulation during turn-taking. Because turn-taking spans multiple modes of human interaction, we suggest that simulation is a foundational mechanism underlying the temporal dynamics of joint action. SIGNIFICANCE STATEMENT Even during passive observation, seeing or hearing somebody execute an action from within our repertoire activates motor cortices of our brain. But what is the functional relevance of such “motor simulation”? By combining a musical duet

  3. A procedure for diamond turning KDP crystals

    SciTech Connect

    Montesanti, R.C.; Thompson, S.L.

    1995-07-07

    A procedure and the equipment necessary for single-point diamond flycutting (loosely referred to as diamond turning) potassium di-hydrogen phosphate (KDP) crystals are described. It is based on current KDP diamond turning activities at the Lawrence Livermore National Laboratory (LLNL), drawing upon knowledge from the Nova crystal finishing development during the 1980`s and incorporating refinements from our efforts during 1995. In addition to describing a step-by-step process for diamond turning KDP, specific discussions are included on the necessary diamond tool geometry and edge sharpness, cutting fluid, and crystal preparation, handling, cleaning, and inspection. The authors presuppose that the reader is already familiar with diamond turning practices.

  4. The Left-Handed Writer.

    ERIC Educational Resources Information Center

    Bloodsworth, James Gaston

    Contrary to the beliefs of many, right-handedness is not a single factor existing in almost all people, with a few exceptions termed left-handed: neither extreme exists independently of the other. During the first 4 years of life there is a period of fluctuation between right and left-handed dominance. Statistics and findings vary in determining…

  5. Advantages in exploring a new environment with the left eye in lizards.

    PubMed

    Bonati, Beatrice; Csermely, Davide; Sovrano, Valeria Anna

    2013-07-01

    Lizards (Podarcis muralis) preferentially use the left eye during spatial exploration in a binocular condition. Here we allowed 44 adult wild lizards to explore an unknown maze for 20 min under a temporary monocular condition whilst recording their movements, particularly the direction of turns made whilst walking within the maze. Lizards with a patch on their right eye, i.e. using their left eye to monitor the environment, moved faster than lizards with a patch on their left eye when turning both leftward and rightward in a T-cross. Hence, right eye-patched lizards were faster than left eye-patched lizards also in turning right, although their right eye was covered. Thus, lizards that could use the left eye/right hemisphere to attend spatial cues appeared to have more control and to be more prompt in exploring the maze. In addition, female lizards with their left eye covered stopped very frequently when they reached crosses, showing a high level of indecision. Results confirm that P. muralis lizards using their left eye only in exploring a new environment react faster and more efficiently than those using the right eye only in exploration. Hence lateralisation of spatial stimuli mediated by the left eye/right hemisphere could provide an advantage to this species.

  6. Plagiarism and the Internet: Turning the Tables.

    ERIC Educational Resources Information Center

    Atkins, Thomas; Nelson, Gene

    2001-01-01

    Notes the problem of Net-based plagiarism in student papers. Describes a solution that turns the tables by using the Internet: TurnItIn.com, an Internet scanner that annotates/marks unattributed material in student papers and compiles a report for the teacher overnight. (SR)

  7. 33 CFR 401.48 - Turning basins.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    .... 1—Opposite Brossard. (b) Turning Basin No. 2—Between Lock 7 and the Guard Gate Cut for vessels up to... vessels up to 107 m in overall length. (b) Turning Basin No. 2—Between Lock 7 and the Guard Gate Cut...

  8. 33 CFR 401.48 - Turning basins.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    .... 1—Opposite Brossard. (b) Turning Basin No. 2—Between Lock 7 and the Guard Gate Cut for vessels up to... vessels up to 107 m in overall length. (b) Turning Basin No. 2—Between Lock 7 and the Guard Gate Cut...

  9. 33 CFR 401.48 - Turning basins.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    .... 1—Opposite Brossard. (b) Turning Basin No. 2—Between Lock 7 and the Guard Gate Cut for vessels up to... vessels up to 107 m in overall length. (b) Turning Basin No. 2—Between Lock 7 and the Guard Gate Cut...

  10. Ictal body turning in focal epilepsy.

    PubMed

    Mercan, Metin; Yıldırım, İrem; Akdemir, Özgür; Bilir, Erhan

    2015-03-01

    Despite the explanations of many lateralization findings, body turning in focal epilepsy has been rarely investigated. One of the aims of this study was to evaluate the role of ictal body turning in the lateralization of focal epilepsies. The records of 263 patients with focal epilepsy (temporal lobe epilepsy (TLE), n=178; extratemporal lobe epilepsy (ETLE), n=85) who underwent prolonged video-EEG monitoring during presurgical epilepsy evaluation were reviewed. Preoperative findings (TLE, n=16; ETLE, n=6) and postoperative outcomes (TLE, n=7) of patients with focal epilepsy with ictal body turning were assessed. For the evaluation of ictal body turning, two definitions were proposed. Nonversive body turning (NVBT) was used to denote at least a 90° nonforced (without tonic or clonic component) rotation of the upper (shoulder) and lower (hip) parts of the body around the body axis for a minimum of 3s. Versive body turning (VBT) was used to denote at least a 90° forced (with tonic or clonic component) rotation of the upper (shoulder) and lower (hip) parts of the body around the body axis for a minimum of 3s. Nonversive body turning was observed in 6% (n=11) of patients with TLE and 2% (n=2) of patients with ETLE. For VBT, these ratios were 5% (n=8) and 7% (n=6) for patients with TLE and ETLE, respectively. Nonversive body turning was frequently oriented to the same side as the epileptogenic zone (EZ) in TLE and ETLE seizures (76% and 80%, respectively). If the amount of NVBT was greater than 180°, then it was 80% to the same side in TLE seizures. Versive body turning was observed in 86% of the TLE seizures, and 55% of the ETLE seizures were found to be contralateral to the EZ. When present with head turning, NVBT ipsilateral to the EZ and VBT contralateral to the EZ were more valuable for lateralization. In TLE seizures, a significant correlation was found between the head turning and body turning onsets and durations. Our study demonstrated that ictal body turning

  11. Which Cheek did the Resurrected Jesus Turn?

    PubMed

    Acosta, Lealani Mae Y; Williamson, John B; Heilman, Kenneth M

    2015-06-01

    Secular portraits are likely to show more of the left than right side of the face (hemiface). Prior research has shown that emotions are more strongly expressed by the left hemiface. In addition, the valence theory of emotion proposes that the right hemisphere is dominant for mediating negative emotions, and the left hemisphere for positive emotions. Since religious art depicting a scene such as the Resurrection of Jesus is more likely to be associated with positive emotions, we postulated that there would be a significant smaller percentage number of artistic works of the Resurrection that reveal the left side of the face of Jesus than in those art works portraying the Crucifixion. Thus, we analyzed artistic portrayals of the Resurrection of Jesus and compared them to the artistic scenes of the Crucifixion. This analysis revealed that the left side of the face of Jesus is less commonly depicted in portraits of the Resurrection than the Crucifixion. In addition, both the right hemiface, and forward-facing faces were also more commonly portrayed in painting of the Resurrection than the Crucifixion. Whereas this right-left hemiface, Resurrection-Crucifixion dichotomy may be related to right-left hemispheric difference in the mediation of emotional valence other factors such as agency, action-intention, and biblical text may have influenced these differences.

  12. Take a breath and take the turn: how breathing meets turns in spontaneous dialogue

    PubMed Central

    Rochet-Capellan, Amélie; Fuchs, Susanne

    2014-01-01

    Physiological rhythms are sensitive to social interactions and could contribute to defining social rhythms. Nevertheless, our knowledge of the implications of breathing in conversational turn exchanges remains limited. In this paper, we addressed the idea that breathing may contribute to timing and coordination between dialogue partners. The relationships between turns and breathing were analysed in unconstrained face-to-face conversations involving female speakers. No overall relationship between breathing and turn-taking rates was observed, as breathing rate was specific to the subjects' activity in dialogue (listening versus taking the turn versus holding the turn). A general inter-personal coordination of breathing over the whole conversation was not evident. However, specific coordinative patterns were observed in shorter time-windows when participants engaged in taking turns. The type of turn-taking had an effect on the respective coordination in breathing. Most of the smooth and interrupted turns were taken just after an inhalation, with specific profiles of alignment to partner breathing. Unsuccessful attempts to take the turn were initiated late in the exhalation phase and with no clear inter-personal coordination. Finally, breathing profiles at turn-taking were different than those at turn-holding. The results support the idea that breathing is actively involved in turn-taking and turn-holding. PMID:25385777

  13. Take a breath and take the turn: how breathing meets turns in spontaneous dialogue.

    PubMed

    Rochet-Capellan, Amélie; Fuchs, Susanne

    2014-12-19

    Physiological rhythms are sensitive to social interactions and could contribute to defining social rhythms. Nevertheless, our knowledge of the implications of breathing in conversational turn exchanges remains limited. In this paper, we addressed the idea that breathing may contribute to timing and coordination between dialogue partners. The relationships between turns and breathing were analysed in unconstrained face-to-face conversations involving female speakers. No overall relationship between breathing and turn-taking rates was observed, as breathing rate was specific to the subjects' activity in dialogue (listening versus taking the turn versus holding the turn). A general inter-personal coordination of breathing over the whole conversation was not evident. However, specific coordinative patterns were observed in shorter time-windows when participants engaged in taking turns. The type of turn-taking had an effect on the respective coordination in breathing. Most of the smooth and interrupted turns were taken just after an inhalation, with specific profiles of alignment to partner breathing. Unsuccessful attempts to take the turn were initiated late in the exhalation phase and with no clear inter-personal coordination. Finally, breathing profiles at turn-taking were different than those at turn-holding. The results support the idea that breathing is actively involved in turn-taking and turn-holding.

  14. Toward Real-Time Automated Detection of Turns during Gait Using Wearable Inertial Measurement Units

    PubMed Central

    Novak, Domen; Goršič, Maja; Podobnik, Janez; Munih, Marko

    2014-01-01

    Previous studies have presented algorithms for detection of turns during gait using wearable sensors, but those algorithms were not built for real-time use. This paper therefore investigates the optimal approach for real-time detection of planned turns during gait using wearable inertial measurement units. Several different sensor positions (head, back and legs) and three different detection criteria (orientation, angular velocity and both) are compared with regard to their ability to correctly detect turn onset. Furthermore, the different sensor positions are compared with regard to their ability to predict the turn direction and amplitude. The evaluation was performed on ten healthy subjects who performed left/right turns at three amplitudes (22, 45 and 90 degrees). Results showed that turn onset can be most accurately detected with sensors on the back and using a combination of orientation and angular velocity. The same setup also gives the best prediction of turn direction and amplitude. Preliminary measurements with a single amputee were also performed and highlighted important differences such as slower turning that need to be taken into account. PMID:25310470

  15. Optimization of turn position of tokamak inductor

    NASA Astrophysics Data System (ADS)

    Aristov, Yu. A.; Vorobev, G. M.; Kuznetsov, A. V.

    Statement and methods of solution of the problem of optimizing turn position of tokamak induction are considered. Optimization is aimed at determination of inductor turn position, providing the minimal scattering of magnetic field in the region of chamber at any assigned value of volt-seconds. Algorithms of problem solution are described, and results of calculations for STX tokamak are presented. It is shown that development methods can be used for determining optimal position of turns of any coils of poloidal magnetic field, providing the assigned configuration and level of magnetic field.

  16. Apraxia in left-handers.

    PubMed

    Goldenberg, Georg

    2013-08-01

    In typical right-handed patients both apraxia and aphasia are caused by damage to the left hemisphere, which also controls the dominant right hand. In left-handed subjects the lateralities of language and of control of the dominant hand can dissociate. This permits disentangling the association of apraxia with aphasia from that with handedness. Pantomime of tool use, actual tool use and imitation of meaningless hand and finger postures were examined in 50 consecutive left-handed subjects with unilateral hemisphere lesions. There were three aphasic patients with pervasive apraxia caused by left-sided lesions. As the dominant hand is controlled by the right hemisphere, they constitute dissociations of apraxia from handedness. Conversely there were also three patients with pervasive apraxia caused by right brain lesions without aphasia. They constitute dissociations of apraxia from aphasia. Across the whole group of patients dissociations from handedness and from aphasia were observed for all manifestations of apraxia, but their frequency depended on the type of apraxia. Defective pantomime and defective tool use occurred rarely without aphasia, whereas defective imitation of hand, but not finger, postures was more frequent after right than left brain damage. The higher incidence of defective imitation of hand postures in right brain damage was mainly due to patients who had also hemi-neglect. This interaction alerts to the possibility that the association of right hemisphere damage with apraxia has to do with spatial aptitudes of the right hemisphere rather than with its control of the dominant left hand. Comparison with data from right-handed patients showed no differences between the severity of apraxia for imitation of hand or finger postures, but impairment on pantomime of tool use was milder in apraxic left-handers than in apraxic right-handers. This alleviation of the severity of apraxia corresponded with a similar alleviation of the severity of aphasia as

  17. Left Main Coronary Artery Aneurysm

    PubMed Central

    Doustkami, Hossein; Maleki, Nasrollah; Tavosi, Zahra

    2016-01-01

    Aneurysms of the left main coronary artery are exceedingly rare clinical entities, encountered incidentally in approximately 0.1% of patients who undergo routine angiography. The most common cause of coronary artery aneurysms is atherosclerosis. Angiography is the gold standard for diagnosis and treatment. Depending on the severity of the coexisting coronary stenosis, patients with left main coronary artery aneurysms can be effectively managed either surgically or pharmacologically. We herein report a case of left main coronary artery aneurysm in a 72-year-old man with a prior history of hypertension presenting to our hospital because of unstable angina. The electrocardiogram showed ST-segment depression and T-wave inversion in the precordial leads. All the data of blood chemistry were normal. Echocardiography showed akinetic anterior wall, septum, and apex, mild mitral regurgitation and ejection fraction of 45%. Coronary angiography revealed a saccular aneurysm of the left main coronary artery with significant stenosis in the left anterior descending, left circumflex, and right coronary artery. The patient immediately underwent coronary artery bypass grafting and ligation of the aneurysm. At six months’ follow-up, he remained asymptomatic. PMID:27403190

  18. Left Ventricular Assist Devices

    PubMed Central

    2004-01-01

    Executive Summary Objective The objective of this health technology policy assessment was to determine the effectiveness and cost-effectiveness of using implantable ventricular assist devices in the treatment of end-stage heart failure. Heart Failure Heart failure is a complex syndrome that impairs the ability of the heart to maintain adequate blood circulation, resulting in multiorgan abnormalities and, eventually, death. In the period of 1994 to 1997, 38,702 individuals in Ontario had a first hospital admission for heart failure. Despite reported improvement in survival, the five-year mortality rate for heart failure is about 50%. For patients with end-stage heart failure that does not respond to medical therapy, surgical treatment or traditional circulatory assist devices, heart transplantation (in appropriate patients) is the only treatment that provides significant patient benefit. Heart Transplant in Ontario With a shortage in the supply of donor hearts, patients are waiting longer for a heart transplant and may die before a donor heart is available. From 1999 to 2003, 55 to 74 people received a heart transplant in Ontario each year. Another 12 to 21 people died while waiting for a suitable donor heart. Of these, 1 to 5 deaths occurred in people under 18 years old. The rate-limiting factor in heart transplant is the supply of donor hearts. Without an increase in available donor hearts, attempts at prolonging the life of some patients on the transplant wait list could have a harmful effect on other patients that are being pushed down the waiting list (knock on effect). LVAD Technology Ventricular assist devices [VADs] have been developed to provide circulatory assistance to patients with end-stage heart failure. These are small pumps that usually assist the damaged left ventricle [LVADs] and may be situated within the body (intracorporeal] or outside the body [extracorporeal). Some of these devices were designed for use in the right ventricle [RVAD] or both

  19. Page turning solutions for musicians: a survey.

    PubMed

    Wolberg, George; Schipper, Irene

    2012-01-01

    Musicians have long been hampered by the challenge in turning sheet music while their hands are occupied playing an instrument. The sight of a human page turner assisting a pianist during a performance, for instance, is not uncommon. This need for a page turning solution is no less acute during practice sessions, which account for the vast majority of playing time. Despite widespread appreciation of the problem, there have been virtually no robust and affordable products to assist the musician. Recent progress in assistive technology and electronic reading devices offers promising solutions to this long-standing problem. The objective of this paper is to survey the technology landscape and assess the benefits and drawbacks of page turning solutions for musicians. A full range of mechanical and digital page turning products are reviewed. PMID:22246302

  20. MedlinePlus.gov Turns 10!

    MedlinePlus

    ... page please turn Javascript on. Photo courtesy of Michael Spencer, NIH NIH MedlinePlus Advisory Group celebrates 10 years of success. Photo courtesy of Michael Spencer, NIH NIH's MedlinePlus.gov , the popular, consumer- ...

  1. Turn analysis of the EMG: the amplitude definition of a turn.

    PubMed

    Yaar, I

    1994-12-01

    Traditionally and arbitrarily an EMG interference signal (EMGIP) "turn" is defined as any 100 microV signal amplitude change. There have not been planned studies challenging this definition. Here, EMGIPs, recorded by coaxial needle electrodes, in MVC, from biceps brachii muscles of 143 subjects, in three diagnostic groups (Normals, Neuropathics, Myopathics), were analyzed in search of the effects of different turn definition amplitude values (TDEF) on the EMGIP number of turns, average turn amplitude, their ratio, and on the cumulative turn amplitude. This study shows significant differences between the diagnostic-groups. It shows that TDEF has significant effect on the number of turns, the average turn amplitude, their ratio, the cumulative amplitude, and that certain TDEFs are significantly better than others in the diagnosis of neuromuscular diseases. Also, it shows that the number of turns and the turns to average amplitude ratio are better measurements than the average turn amplitude and than the cumulative turn amplitude in showing differences between the EMGIPs of the various diagnostic-groups. As such, some of the smaller TDEFs are significantly better diagnostically than the traditional 100 microV value. Also, it shows that better discrimination between the diagnostic-groups may be achieved by applying more than one TDEF value onto the same data. This study leaves the question of the best TDEF or best TDEF sets open for further research in similar and in different paradigms and technical settings.

  2. Induction motor inter turn fault detection using infrared thermographic analysis

    NASA Astrophysics Data System (ADS)

    Singh, Gurmeet; Anil Kumar, T. Ch.; Naikan, V. N. A.

    2016-07-01

    Induction motors are the most commonly used prime movers in industries. These are subjected to various environmental, thermal and load stresses that ultimately reduces the motor efficiency and later leads to failure. Inter turn fault is the second most commonly observed faults in the motors and is considered the most severe. It can lead to the failure of complete phase and can even cause accidents, if left undetected or untreated. This paper proposes an online and non invasive technique that uses infrared thermography, in order to detect the presence of inter turn fault in induction motor drive. Two methods have been proposed that detect the fault and estimate its severity. One method uses transient thermal monitoring during the start of motor and other applies pseudo coloring technique on infrared image of the motor, after it reaches a thermal steady state. The designed template for pseudo-coloring is in acquiescence with the InterNational Electrical Testing Association (NETA) thermographic standard. An index is proposed to assess the severity of the fault present in the motor.

  3. Why Am I Left-Handed?

    MedlinePlus

    ... does since most hitters are right-handed. In basketball and other sports, a left-handed player can ... change in strategy. For instance, a left-handed basketball player will dribble with his or her left ...

  4. An external tank is moved from a barge in the turn basin to the VAB

    NASA Technical Reports Server (NTRS)

    2000-01-01

    A newly arrived external tank begins the turn on the road leading to the Vehicle Assembly Building (VAB), seen behind the tank. Seated in his perch near the rear left wheels is the transporter driver. The tank will be moved through the open door (facing the tank) into the main transfer aisle. From there it will be moved to one of the high bays and await stacking for a future Shuttle mission. External tanks are built by the NASA Michoud Assembly Facility in New Orleans and transported by barge to Cape Canaveral and then up the Banana River to the turn basin in the Launch Complex 39 Area.

  5. Bodily-visual practices and turn continuation.

    PubMed

    Ford, Cecilia E; Thompson, Sandra A; Drake, Veronika

    2012-01-01

    This paper considers points in turn construction where conversation researchers have shown that talk routinely continues beyond possible turn completion, but where we find bodily-visual behavior doing such turn extension work. The bodily-visual behaviors we examine share many features with verbal turn extensions, but we argue that embodied movements have distinct properties that make them well-suited for specific kinds of social action, including stance display and by-play in sequences framed as subsidiary to a simultaneous and related verbal exchange. Our study is in line with a research agenda taking seriously the point made by Goodwin (2000a, b, 2003), Hayashi (2003, 2005), Iwasaki (2009), and others that scholars seeking to account for practices in language and social interaction do themselves a disservice if they privilege the verbal dimension; rather, as suggested in Stivers/Sidnell (2005), each semiotic system/modality, while coordinated with others, has its own organization. With the current exploration of bodily-visual turn extensions, we hope to contribute to a growing understanding of how these different modes of organization are managed concurrently and in concert by interactants in carrying out their everyday social actions. PMID:23526861

  6. Reconceptualizing Autonomy: A Relational Turn in Bioethics.

    PubMed

    Jennings, Bruce

    2016-05-01

    History's judgment on the success of bioethics will not depend solely on the conceptual creativity and innovation in the field at the level of ethical and political theory, but this intellectual work is not insignificant. One important new development is what I shall refer to as the relational turn in bioethics. This development represents a renewed emphasis on the ideographic approach, which interprets the meaning of right and wrong in human actions as they are inscribed in social and cultural practices and in structures of lived meaning and interdependence; in an ideographic approach, the task of bioethics is to bring practice into theory, not the other way around. The relational turn in bioethics may profoundly affect the critical questions that the field asks and the ethical guidance it offers society, politics, and policy. The relational turn provides a way of correcting the excessive atomism of many individualistic perspectives that have been, and continue to be, influential in bioethics. Nonetheless, I would argue that most of the work reflecting the relational turn remains distinctively liberal in its respect for the ethical significance of the human individual. It moves away from individualism, but not from the value of individuality.In this review essay, I shall focus on how the relational turn has manifested itself in work on core concepts in bioethics, especially liberty and autonomy. Following a general review, I conclude with a brief consideration of two important recent books in this area: Jennifer Nedelsky's Law's Relations and Rachel Haliburton's Autonomy and the Situated Self. PMID:26847836

  7. Market turning points forecasting using wavelet analysis

    NASA Astrophysics Data System (ADS)

    Bai, Limiao; Yan, Sen; Zheng, Xiaolian; Chen, Ben M.

    2015-11-01

    Based on the system adaptation framework we previously proposed, a frequency domain based model is developed in this paper to forecast the major turning points of stock markets. This system adaptation framework has its internal model and adaptive filter to capture the slow and fast dynamics of the market, respectively. The residue of the internal model is found to contain rich information about the market cycles. In order to extract and restore its informative frequency components, we use wavelet multi-resolution analysis with time-varying parameters to decompose this internal residue. An empirical index is then proposed based on the recovered signals to forecast the market turning points. This index is successfully applied to US, UK and China markets, where all major turning points are well forecasted.

  8. Development of beryllium mirror turning technology

    SciTech Connect

    Arnold, J.B.

    1991-04-01

    Because of the unique properties of beryllium (Be) and the advantages of single point turning, a development program has been instituted to single point turn beryllium as a means to produce optics. Initial effort to diamond turn beryllium resulted in less than desirable results and development efforts were directed at finding a more suitable tool material. Both single and polycrystalline tool materials were evaluated and cubic boron nitride (CBN) was found to produce the better results. Tool wear has been the primary limitation in precision machining beryllium and advances have allowed a two order-of-magnitude reduction in this problem. After considerable efforts, results with CBN appear to be approaching a limit, and diamond, as tool material, was re-evaluated with promising results. A development program is now under way to determine if diamond may be used to machine larger and more complex beryllium parts.

  9. Magnetic substorms and northward IMF turning

    NASA Astrophysics Data System (ADS)

    Troshichev, Oleg; Podorozhkina, Nataly

    To determine the relation of the northward IMF turnings to substorm sudden onsets, we separated all events with sharp northward IMF turnings observed in years of solar maximum (1999-2002) and solar minimum (2007-2008). The events (N=261) have been classified in 5 groups in accordance with average magnetic activity in auroral zone (low, moderate or high levels of AL index) at unchanged or slightly changed PC index and with dynamics of PC (steady distinct growth or distinct decline) at arbitrary values of AL index. Statistical analysis of relationships between the IMF turning and changes of PC and AL indices has been fulfilled separately for each of 5 classes. Results of the analysis showed that, irrespective of geophysical conditions and solar activity epoch, the magnetic activity in the polar caps and in the auroral zone demonstrate no response to the sudden northward IMF turning, if the moment of northward turning is taken as a key date. Sharp increases of magnetic disturbance in the auroral zone are observed only under conditions of the growing PC index and statistically they are related to moment of the PC index exceeding the threshold level (~1.5 mV/m), not to northward turnings timed, as a rule, after the moment of sudden onset. Magnetic disturbances observed in these cases in the auroral zone (magnetic substorms) are guided by behavior of the PC index, like to ordinary magnetic substorms or substorms developed under conditions of the prolonged northward IMF impact on the magnetosphere. The evident inconsistency between the sharp IMF changes measured outside of the magnetosphere and behavior of the ground-based PC index, the latter determining the substorm development, provides an additional argument in favor of the PC index as a ground-based proxy of the solar wind energy that entered into magnetosphere.

  10. Examining anticipatory turn signaling in typically developing 4- and 5-year-old children for applications in active orthotic devices.

    PubMed

    Stirling, Leia; Weatherly, Jake

    2013-03-01

    To develop active pediatric orthotics, it is important to accurately predict alterations to a straight path, such as turns. In this study we examine anticipatory signals prior to a pre-defined turn in seven healthy children. Subjects walked along a predefined 4.25m straight path and then made either a 40-degree turn left or right, or continued straight based on a pre-set color panel at the endpoint. The forward center of mass (COM) velocity for the stride prior to the turn region was 1.16±0.22m/s (no significant difference was seen with respect to turn direction, p>0.05). In the stride prior to landing in the turn region, subjects showed a significant difference in the mediolateral COM velocity with respect to the turn direction (p=0.003 for 30% and p<0.0005 for 40-100% of the gait cycle). No significant differences were observed in the sagittal plane kinematics of the hip, knee, or ankle during the preparatory stride with respect to turn direction (p>0.05) when compared at 10% gait increments. However, significant differences were observed in pelvic rotation for 10-30% (p<0.05) and 70-100% (p<0.0005) of the gait cycle. The subjects were inconsistent in strategy used to perform a turn. In trials to the left and right, 66% and 56% of the trials were step turns, respectively. The varying turn strategy may be a function of limited instructions provided to the child, or ongoing development in the children's COM control. Yet even with the varying strategies, there exist anticipatory signals that can be used to design real-time controllers for assistive devices with readily available sensor systems.

  11. Turn-timing in signed conversations: coordinating stroke-to-stroke turn boundaries

    PubMed Central

    de Vos, Connie; Torreira, Francisco; Levinson, Stephen C.

    2015-01-01

    In spoken interactions, interlocutors carefully plan, and time their utterances, minimizing gaps and overlaps between consecutive turns. Cross-linguistic comparison has indicated that spoken languages vary only minimally in terms of turn-timing, and language acquisition research has shown pre-linguistic vocal turn-taking in the first half year of life. These observations suggest that the turn-taking system may provide a fundamental basis for our linguistic capacities. The question remains, however, to what extent our capacity for rapid turn-taking is determined by modality constraints. The avoidance of overlapping turns could be motivated by the difficulty of hearing and speaking at the same time. If so, turn-taking in sign might show greater toleration for overlap. Alternatively, signed conversations may show a similar distribution of turn-timing as spoken languages, thus avoiding both gaps and overlaps. To address this question we look at turn-timing in question–answer sequences in spontaneous conversations of Sign Language of the Netherlands. The findings indicate that although there is considerable overlap in two or more signers’ articulators in conversation, when proper allowance is made for onset preparation, post-utterance retraction and the intentional holding of signs for response, turn-taking latencies in sign look remarkably like those reported for spoken language. This is consistent with the possibility that, at least with regard to responses to questions, speakers and signers follow similar time courses in planning and producing their utterances in on-going conversation. This suggests that turn-taking systems may well be a shared cognitive infrastructure underlying all modern human languages, both spoken and signed. PMID:25852593

  12. Turn Allocation Patterns and Learning Opportunities

    ERIC Educational Resources Information Center

    Xie, Xiaoyan

    2011-01-01

    Drawing on data from three English classrooms at two Chinese universities, this paper documents the turn-taking patterns that the teachers and students developed over time and explores how these patterns affected students' opportunities to participate in classroom discourse. The data were collected through observations, audio- and video-taping,…

  13. Saccadic body turns in walking Drosophila

    PubMed Central

    Geurten, Bart R. H.; Jähde, Philipp; Corthals, Kristina; Göpfert, Martin C.

    2014-01-01

    Drosophila melanogaster structures its optic flow during flight by interspersing translational movements with abrupt body rotations. Whether these “body saccades” are accompanied by steering movements of the head is a matter of debate. By tracking single flies moving freely in an arena, we now discovered that walking Drosophila also perform saccades. Movement analysis revealed that the flies separate rotational from translational movements by quickly turning their bodies by 15 degrees within a tenth of a second. Although walking flies moved their heads by up to 20 degrees about their bodies, their heads moved with the bodies during saccadic turns. This saccadic strategy contrasts with the head saccades reported for e.g., blowflies and honeybees, presumably reflecting optical constraints: modeling revealed that head saccades as described for these latter insects would hardly affect the retinal input in Drosophila because of the lower acuity of its compound eye. The absence of head saccades in Drosophila was associated with the absence of haltere oscillations, which seem to guide head movements in other flies. In addition to adding new twists to Drosophila walking behavior, our analysis shows that Drosophila does not turn its head relative to its body when turning during walking. PMID:25386124

  14. Turning Parents from Critics to Allies.

    ERIC Educational Resources Information Center

    Sagarese, Margaret M.; Giannetti, Charlene C.

    1998-01-01

    Authors of "The Roller Coaster Years" (1997) advise how middle-level educators can turn wary, disinterested parents into allies. Teachers should welcome parents, advertise their own expertise, implement an early-warning system, portray children positively, convey shared values, reassure parents about children's safety, demonstrate insider…

  15. Circuit Controls Turn-On Current

    NASA Technical Reports Server (NTRS)

    Holmes, K. G.

    1972-01-01

    Single choke used in primary circuit with diode arrangement, maintaining dc current flow through choke and setting up a unidirectional magnetic field, limits turn-on current of transformer-rectifier power supply. Technique reduces number and weight of components and minimizes effect of initial inrush surge current on source.

  16. Turning the Page with Preconference Workshops

    ERIC Educational Resources Information Center

    Knowledge Quest, 2011

    2011-01-01

    For those who are experiencing a lack of creative inspiration within their school library program but are ready to "turn a page" in their career or school library program, they may head to Minneapolis to attend one of the many great preconference workshops. This article presents and describes preconference workshops design to rid librarians of the…

  17. Turning Practitioners into Professors: Exploring Effective Mentoring.

    ERIC Educational Resources Information Center

    Thomsen, Steven R.; Gustafson, Robert L.

    1997-01-01

    Presents results of focus interviews with 25 "practitioners turned professors" regarding their transition from industry to academia. Finds a general consensus that all advertising and public relations programs should implement a formal mentoring process to include teacher training and inservice, greater explanation of and assistance with promotion…

  18. Turning movement estimation in real time

    SciTech Connect

    Martin, P.T.

    1997-08-01

    Fast processors offer exciting opportunities for real-time traffic monitoring. Conventional transportation planning models that assume stable and predictable travel patterns do not lend themselves to on-line traffic forecasting. This paper describes how a new traffic flow inference model has the potential to determine comprehensive flow information in real time. Its philosophical basis is borrowed from the field of operational research, where it has been used for optimizing water and electricity flows. This paper shows how road traffic turning movement flows can be estimated from link detected flows at small recurrent intervals, in real time. The paper details the formulation of the problem, outlines the structure of the data set that provides the detector data for the model input and observed turning flows for the model evaluation. The theoretical principles that define the model are described briefly. Turning movement flow estimates, at 5-min intervals, from two independent surveys are presented and analyzed. The results show an overall mean coefficient of determination (r{sup 2}) of 79--82% between observed and modeled turning movement flows.

  19. Leadership Helps Turn around a Troubled School

    ERIC Educational Resources Information Center

    Sheppard, Von

    2013-01-01

    The author tells how he employed leadership skills to help turn around a failing school loaded with at-risk students. Dayton's Bluff Elementary School was one of the worst in St. Paul when Von Sheppard took over as principal in 2001. Changing the staff and attitudes at the largely low-income, minority majority school in a tough neighborhood…

  20. 32 CFR 935.135 - Turns.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 32 National Defense 6 2013-07-01 2013-07-01 false Turns. 935.135 Section 935.135 National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE TERRITORIAL AND INSULAR REGULATIONS WAKE ISLAND... motion from a stopped position, or change from or merge into a lane of traffic, until he can safely...

  1. 32 CFR 935.135 - Turns.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 32 National Defense 6 2011-07-01 2011-07-01 false Turns. 935.135 Section 935.135 National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE TERRITORIAL AND INSULAR REGULATIONS WAKE ISLAND... motion from a stopped position, or change from or merge into a lane of traffic, until he can safely...

  2. 32 CFR 636.23 - Turning movements.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 4 2010-07-01 2010-07-01 true Turning movements. 636.23 Section 636.23 National Defense Department of Defense (Continued) DEPARTMENT OF THE ARMY (CONTINUED) LAW ENFORCEMENT AND CRIMINAL INVESTIGATIONS MOTOR VEHICLE TRAFFIC SUPERVISION (SPECIFIC INSTALLATIONS) Fort Stewart, Georgia § 636.23...

  3. The Linguistic Turn within Curriculum Theory

    ERIC Educational Resources Information Center

    Englund, Tomas

    2011-01-01

    If, as the linguistic turn has taught us, there is no representational knowledge, but more agreements and/or struggles over how to talk and learn about what we call reality, we need to address and analyse the consequences of different vocabularies of educational phenomena and schooling, in order to better understand and make use of both the…

  4. Primordial spectra from sudden turning trajectory

    SciTech Connect

    Noumi, Toshifumi; Yamaguchi, Masahide E-mail: gucci@phys.titech.ac.jp

    2013-12-01

    Effects of heavy fields on primordial spectra of curvature perturbations are discussed in inflationary models with a sudden turning trajectory. When heavy fields are excited after the sudden turn and oscillate around the bottom of the potential, the following two effects are generically induced: deformation of the inflationary background spacetime and conversion interactions between adiabatic and isocurvature perturbations, both of which can affect the primordial density perturbations. In this paper, we calculate primordial spectra in inflationary models with sudden turning potentials taking into account both of the two effects appropriately. We find that there are some non-trivial correlations between the two effects in the power spectrum and, as a consequence, the primordial scalar power spectrum has a peak around the scale exiting the horizon at the turn. Though both effects can induce parametric resonance amplifications, they are shown to be canceled out for the case with the canonical kinetic terms. The peak feature and the scale dependence of bispectra are also discussed.

  5. Business Intelligence: Turning Knowledge into Power

    ERIC Educational Resources Information Center

    Endsley, Krista

    2009-01-01

    Today, many school districts are turning to business intelligence tools to retrieve, organize, and share knowledge for faster analysis and more effective, guided decision making. Business intelligence (BI) tools are the technologies and applications that gather and report information to help an organization's leaders make better decisions. BI…

  6. 32 CFR 935.135 - Turns.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 32 National Defense 6 2012-07-01 2012-07-01 false Turns. 935.135 Section 935.135 National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE TERRITORIAL AND INSULAR REGULATIONS WAKE ISLAND... motion from a stopped position, or change from or merge into a lane of traffic, until he can safely...

  7. 32 CFR 935.135 - Turns.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 32 National Defense 6 2014-07-01 2014-07-01 false Turns. 935.135 Section 935.135 National Defense Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE TERRITORIAL AND INSULAR REGULATIONS WAKE ISLAND... motion from a stopped position, or change from or merge into a lane of traffic, until he can safely...

  8. Can Language Classrooms Take the Multilingual Turn?

    ERIC Educational Resources Information Center

    Paquet-Gauthier, Myriam; Beaulieu, Suzie

    2016-01-01

    For the past three decades, momentum has gathered in favour of a multilingual turn in second language acquisition research and teaching. "Multicompetence" has been proposed to replace "nativeness" and "monolingualism" to measure L2 learners' success. This proposed shift has not made its way into L2 teaching settings.…

  9. Silicon Carbide Emitter Turn-Off Thyristor

    DOE PAGES

    Wang, Jun; Wang, Gangyao; Li, Jun; Huang, Alex Q.; Melcher, Jerry; Atcitty, Stan

    2008-01-01

    A novel MOS-conmore » trolled SiC thyristor device, the SiC emitter turn-off thyristor (ETO) is a promising technology for future high-voltage switching applications because it integrates the excellent current conduction capability of a SiC thyristor with a simple MOS-control interface. Through unity-gain turn-off, the SiC ETO also achieves excellent Safe Operation Area (SOA) and faster switching speeds than silicon ETOs. The world's first 4.5-kV SiC ETO prototype shows a forward voltage drop of 4.26 V at 26.5  A / cm 2 current density at room and elevated temperatures. Tested in an inductive circuit with a 2.5 kV DC link voltage and a 9.56-A load current, the SiC ETO shows a fast turn-off time of 1.63 microseconds and a low 9.88 mJ turn-off energy. The low switching loss indicates that the SiC ETO could operate at about 4 kHz if 100  W / cm 2 conduction and the 100  W / cm 2 turn-off losses can be removed by the thermal management system. This frequency capability is about 4 times higher than 4.5-kV-class silicon power devices. The preliminary demonstration shows that the SiC ETO is a promising candidate for high-frequency, high-voltage power conversion applications, and additional developments to optimize the device for higher voltage (>5 kV) and higher frequency (10 kHz) are needed.« less

  10. 14 CFR 417.209 - Malfunction turn analysis.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... turn curves that are smooth and continuous. (7) For each malfunction turn, the launch vehicle velocity vector turn angle from the nominal launch vehicle velocity vector. (8) For each malfunction turn, the launch vehicle velocity turn magnitude from the nominal velocity magnitude that corresponds to...

  11. 14 CFR 417.209 - Malfunction turn analysis.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... turn curves that are smooth and continuous. (7) For each malfunction turn, the launch vehicle velocity vector turn angle from the nominal launch vehicle velocity vector. (8) For each malfunction turn, the launch vehicle velocity turn magnitude from the nominal velocity magnitude that corresponds to...

  12. 14 CFR 417.209 - Malfunction turn analysis.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... turn curves that are smooth and continuous. (7) For each malfunction turn, the launch vehicle velocity vector turn angle from the nominal launch vehicle velocity vector. (8) For each malfunction turn, the launch vehicle velocity turn magnitude from the nominal velocity magnitude that corresponds to...

  13. 14 CFR 417.209 - Malfunction turn analysis.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... turn curves that are smooth and continuous. (7) For each malfunction turn, the launch vehicle velocity vector turn angle from the nominal launch vehicle velocity vector. (8) For each malfunction turn, the launch vehicle velocity turn magnitude from the nominal velocity magnitude that corresponds to...

  14. 14 CFR 417.209 - Malfunction turn analysis.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... turn curves that are smooth and continuous. (7) For each malfunction turn, the launch vehicle velocity vector turn angle from the nominal launch vehicle velocity vector. (8) For each malfunction turn, the launch vehicle velocity turn magnitude from the nominal velocity magnitude that corresponds to...

  15. ECG manifestations of left ventricular electrical remodeling.

    PubMed

    Estes, E Harvey

    2012-01-01

    Research and thinking about the electrocardiographic manifestations of left ventricular hypertrophy has been constrained by a limited conceptual model of the process: heart disease produces chamber enlargement (increased mass), which in turn produces an altered electrocardiogram. The process is much more complex than can be represented in this simple model. A more robust and intricate model is proposed, in which heart (and vascular) disease causes structural changes, electrical changes, biochemical changes, and others, all of which interact to produce electrical remodeling of ventricular myocardium. This electrical remodeling results in a variety of ECG changes. All of these changes interact, leading to an altered clinical course, and to premature death. It is suggested that research, based on this model, can provide new clues to the processes involved, and improve the prediction of clinical outcomes. New directions in research, in recording equipment, and in organizational activities are suggested to test this new model, and to improve the usefulness of the electrocardiogram as a research and diagnostic tool.

  16. Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections

    PubMed Central

    Xiang, Yun; Li, Zhibin; Wang, Wei; Chen, Jingxu; Wang, Hao; Li, Ye

    2016-01-01

    Median U-turn intersection treatment (MUTIT) has been considered an alternative measure to reduce congestion and traffic conflict at intersection areas. The MUTIT is sometimes difficult to implement in the field because it requires wide median on arterials for U-turn vehicles. The objective of this study is to introduce an unconventional U-turn treatment (UUT) for intersections which requires less median space but is also effective. The UUT has a dual-bay design with different turning radiuses for small and large vehicles. The VISSIM simulation model was developed to evaluate the operational features of the UUT. The model was calibrated using data collected from intersections in China. The capacity, delay and number of stops were evaluated and compared with the direct-left-turn (DLT) for the same intersections. The results showed that the UUT significantly improved the operations at intersection areas, especially when volume/capacity ratio is small, and ratio of left-turn to through traffic is small. With the UUT, the capacity is increased by 9.81% to 10.38%, vehicle delay is decreased by 18.5% to 40.1%, and number of stops is decreased by 23.19% to 36.62%, when volume/capacity ratio is less than 0.50. The study also found that traffic efficiency could be further improved when the UUT is designed in conjunction with signal control. In the case, the UUT plus signalized control increases the capacity by 25% to 26.02%, decreases vehicle delay by 50.5% to 55.8%, and reduces number of stops by 69.5%, compared with the traditional DLT. PMID:27467127

  17. Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections.

    PubMed

    Xiang, Yun; Li, Zhibin; Wang, Wei; Chen, Jingxu; Wang, Hao; Li, Ye

    2016-01-01

    Median U-turn intersection treatment (MUTIT) has been considered an alternative measure to reduce congestion and traffic conflict at intersection areas. The MUTIT is sometimes difficult to implement in the field because it requires wide median on arterials for U-turn vehicles. The objective of this study is to introduce an unconventional U-turn treatment (UUT) for intersections which requires less median space but is also effective. The UUT has a dual-bay design with different turning radiuses for small and large vehicles. The VISSIM simulation model was developed to evaluate the operational features of the UUT. The model was calibrated using data collected from intersections in China. The capacity, delay and number of stops were evaluated and compared with the direct-left-turn (DLT) for the same intersections. The results showed that the UUT significantly improved the operations at intersection areas, especially when volume/capacity ratio is small, and ratio of left-turn to through traffic is small. With the UUT, the capacity is increased by 9.81% to 10.38%, vehicle delay is decreased by 18.5% to 40.1%, and number of stops is decreased by 23.19% to 36.62%, when volume/capacity ratio is less than 0.50. The study also found that traffic efficiency could be further improved when the UUT is designed in conjunction with signal control. In the case, the UUT plus signalized control increases the capacity by 25% to 26.02%, decreases vehicle delay by 50.5% to 55.8%, and reduces number of stops by 69.5%, compared with the traditional DLT. PMID:27467127

  18. Bank-to-turn control technology survey for homing missiles

    NASA Technical Reports Server (NTRS)

    Riedel, F. W.

    1980-01-01

    The potential advantages of bank-to-turn control are summarized. Recent and current programs actively investigating bank-to-turn steering are reviewed and critical technology areas concerned with bank-to-turn control are assessed.

  19. Measurement of tool forces in diamond turning

    SciTech Connect

    Drescher, J.; Dow, T.A.

    1988-12-01

    A dynamometer has been designed and built to measure forces in diamond turning. The design includes a 3-component, piezoelectric transducer. Initial experiments with this dynamometer system included verification of its predicted dynamic characteristics as well as a detailed study of cutting parameters. Many cutting experiments have been conducted on OFHC Copper and 6061-T6 Aluminum. Tests have involved investigation of velocity effects, and the effects of depth and feedrate on tool forces. Velocity has been determined to have negligible effects between 4 and 21 m/s. Forces generally increase with increasing depth of cut. Increasing feedrate does not necessarily lead to higher forces. Results suggest that a simple model may not be sufficient to describe the forces produced in the diamond turning process.

  20. An investigation into magnetic electrolytic abrasive turning

    NASA Astrophysics Data System (ADS)

    Mahdy, M. A. M.; Ismaeial, A. L.; Aly, F. F.

    2013-07-01

    The magnetic electrolytic abrasive turning (MEAT) process as a non-traditional machining is used to obtain surface finishing like mirror. MEAT provides one of the best alternatives for producing complex shapes with good finish in advanced materials used in aircraft and aerospace industries. The improvement of machining accuracy of MEAT continues to be a major challenge for modern industry. MEAT is a hybrid machining which combines two or more processes to remove material. The present research focuses on the development of precision electrochemical turning (ECT) under the effects of magnetic field and abrasives. The effect of magnetic flux density, electrochemical conditions and abrasive parameters on finishing efficiency and surface roughness are investigated. An empirical relationship is deduced.

  1. Maximum terminal velocity turns at constant altitude

    NASA Astrophysics Data System (ADS)

    Eisler, G. Richard; Hull, David G.

    An optimal control problem is formulated for a maneuvering reentry vehicle to execute a maximum terminal velocity turn at constant altitude to a fixed final position. A control solution technique is devised which uses a Newton scheme to repetitively solve a nonlinear algebraic system for two parameters to provide the on-line guidance. The turn control takes advantage of the high dynamic pressure at the beginning of the flight path; the lift solution acts to null deviations from the prescribed altitude. Control solutions are compared for a continuously updated, approximate physical model, for a simulation of the approximate optimal guidance in a true physical model, and for a parameter optimization solution for the true model. End constraint satisfaction is excellent. Overall trajectory agreement is good, if the assumed atmospheric model is reasonably accurate.

  2. Maximum terminal velocity turns at constant altitude

    SciTech Connect

    Eisler, G.R.; Hull, D.G.

    1987-01-01

    An optimal control problem is formulated for a maneuvering reentry vehicle to execute a maximum terminal velocity turn at constant altitude to a fixed final position. A control solution technique is devised which uses a Newton scheme to repetitively solve a nonlinear algebraic system for two parameters to provide the on-line guidance. The turn control takes advantage of the high dynamic pressure at the beginning of the flight path; the lift solution acts to null deviations from the prescribed altitude. Control solutions are compared for a continuously updated, approximate physical model, for a simulation of the approximate optimal guidance in a true physical model, and for a parameter optimization solution for the true model. End constraint satisfaction is excellent. Overall trajectory agreement is good, if the assumed atmospheric model is reasonably accurate.

  3. When attempts at robbing prey turn fatal.

    PubMed

    Dejean, Alain; Corbara, Bruno; Azémar, Frédéric; Carpenter, James M

    2012-07-01

    Because group-hunting arboreal ants spread-eagle insect prey for a long time before retrieving them, these prey can be coveted by predatory flying insects. Yet, attempting to rob these prey is risky if the ant species is also an effective predator. Here, we show that trying to rob prey from Azteca andreae workers is a fatal error as 268 out of 276 potential cleptobionts (97.1 %) were captured in turn. The ant workers hunt in a group and use the "Velcro®" principle to cling firmly to the leaves of their host tree, permitting them to capture very large prey. Exceptions were one social wasp, plus some Trigona spp. workers and flies that landed directly on the prey and were able to take off immediately when attacked. We conclude that in this situation, previously captured prey attract potential cleptobionts that are captured in turn in most of the cases.

  4. When attempts at robbing prey turn fatal.

    PubMed

    Dejean, Alain; Corbara, Bruno; Azémar, Frédéric; Carpenter, James M

    2012-07-01

    Because group-hunting arboreal ants spread-eagle insect prey for a long time before retrieving them, these prey can be coveted by predatory flying insects. Yet, attempting to rob these prey is risky if the ant species is also an effective predator. Here, we show that trying to rob prey from Azteca andreae workers is a fatal error as 268 out of 276 potential cleptobionts (97.1 %) were captured in turn. The ant workers hunt in a group and use the "Velcro®" principle to cling firmly to the leaves of their host tree, permitting them to capture very large prey. Exceptions were one social wasp, plus some Trigona spp. workers and flies that landed directly on the prey and were able to take off immediately when attacked. We conclude that in this situation, previously captured prey attract potential cleptobionts that are captured in turn in most of the cases. PMID:22710934

  5. Crack Turning in Integrally Stiffened Aircraft Structures

    NASA Technical Reports Server (NTRS)

    Pettit, Richard Glen

    2000-01-01

    Current emphasis in the aircraft industry toward reducing manufacturing cost has created a renewed interest in integrally stiffened structures. Crack turning has been identified as an approach to improve the damage tolerance and fail-safety of this class of structures. A desired behavior is for skin cracks to turn before reaching a stiffener, instead of growing straight through. A crack in a pressurized fuselage encounters high T-stress as it nears the stiffener--a condition favorable to crack turning. Also, the tear resistance of aluminum alloys typically varies with crack orientation, a form of anisotropy that can influence the crack path. The present work addresses these issues with a study of crack turning in two-dimensions, including the effects of both T-stress and fracture anisotropy. Both effects are shown to have relation to the process zone size, an interaction that is central to this study. Following an introduction to the problem, the T-stress effect is studied for a slightly curved semi-infinite crack with a cohesive process zone, yielding a closed form expression for the future crack path in an infinite medium. For a given initial crack tip curvature and tensile T-stress, the crack path instability is found to increase with process zone size. Fracture orthotropy is treated using a simple function to interpolate between the two principal fracture resistance values in two-dimensions. An extension to three-dimensions interpolates between the six principal values of fracture resistance. Also discussed is the transition between mode I and mode II fracture in metals. For isotropic materials, there is evidence that the crack seeks out a direction of either local symmetry (pure mode I) or local asymmetry (pure mode II) growth. For orthotropic materials the favored states are not pure modal, and have mode mixity that is a function of crack orientation.

  6. Individual muscle contributions to circular turning mechanics.

    PubMed

    Ventura, Jessica D; Klute, Glenn K; Neptune, Richard R

    2015-04-13

    Turning is an activity of daily living that involves both the acceleration of the body center-of-mass (COM) towards the center of curvature and rotation of the pelvis towards the new heading. The purpose of this study was to understand which muscles contribute to turning using experimentation, musculoskeletal modeling and simulation. Ten healthy adults consented to walk around a 1-m radius circular path at their self-selected walking speed and then along a straight line at the same speed. Forward dynamics simulations of the individual subjects during the turning and straight-line walking tasks were generated to identify the contributions of individual muscle groups to the body mediolateral and anterior-posterior COM acceleration impulse and to the pelvis angular acceleration impulse. The stance leg gluteus medius and ankle plantarflexor muscles and the swing leg adductor muscles were the primary contributors to redirect the body's COM relative to straight-line walking. In some cases, contributions to mediolateral COM acceleration were modulated through changes in leg orientation rather than through changes in muscle force. While modulation of the muscle contributions generally occurred in both the inner and outer legs, greater changes were observed during inner single-leg support than during outer single-leg support. Total pelvis angular acceleration was minimal during the single-support phase, but the swing leg muscles contributed significantly to balancing the internal and external rotation of the pelvis. The understanding of which muscles contribute to turning the body during walking may help guide the development of more effective locomotor therapies for those with movement impairments.

  7. Predicting Turning Points for Toy Cars

    NASA Astrophysics Data System (ADS)

    Ramsdell, M. W.; Wick, D. P.

    2005-10-01

    A simple experiment can be performed to estimate a toy car's effective coefficient of friction without the use of sophisticated equipment. The results can be used to predict the car's turning points when traveling on an arbitrarily shaped track containing multiple hills and valleys in a 2-D vertical plane. This activity is based on a team-oriented modeling-based project conducted at Clarkson University, which was published in the American Journal of Physics.

  8. Back to School, Moving Forward: What "No Child Left Behind" Means for America's Educators.

    ERIC Educational Resources Information Center

    Department of Education, Washington, DC. Office of the Secretary.

    President George W. Bush's "No Child Left Behind" plan for educational improvement is based on four principles: accountability for results; local control and flexibility; expanded parental choice; and effective and successful programs. The program is dedicated to lifting up all teachers so that these teachers can, in turn, lift up their students.…

  9. Lattice Modeling and Calibration with Turn-by-Turn Orbit Data

    SciTech Connect

    Huang, X.; Sebek, J.; Martin, D.; /SLAC

    2011-04-05

    A new method that explores turn-by-turn BPM data to calibrate lattice models of accelerators is proposed. The turn-by-turn phase space coordinates at one location of the ring are first established using data from two BPMs separated by a simple section with a known transfer matrix, such as a drift space. The phase space coordinates are then tracked with the model to predict positions at other BPMs, which can be compared to measurements. The model is adjusted to minimize the difference between the measured and predicted orbit data. BPM gains and rolls are included as fitting variables. This technique can be applied to either the entire or a section of the ring. We have tested the method experimentally on a part of the SPEAR3 ring.

  10. Facts about Hypoplastic Left Heart Syndrome

    MedlinePlus

    ... left and right sides of the heart: the patent ductus arteriosus and the patent foramen ovale . Normally, these openings will close a ... functioning left side of the heart through the patent ductus arteriosus and the patent foramen ovale. The ...

  11. CREST Modelling of PBX 9502 Corner Turning Experiments at Different Initial Temperatures

    NASA Astrophysics Data System (ADS)

    Whitworth, Nicholas

    2013-06-01

    Corner turning is an important problem in regard to detonation wave propagation in TATB-based explosives. Experimentally, a sudden change in direction of the propagating wave, such as turning a sharp corner, can result in dead-zones being left behind in the corner turn region, with the observed behaviour being particularly sensitive to the initial temperature of the explosive. In this paper, the entropy-dependent CREST reactive burn model is used to simulate corner turning experiments on the TATB-based explosive PBX 9502. Calculated results of double cylinder tests at three different initial temperatures (-54°C, 25°C, and 75°C), and a ``hockey puck'' experiment at ambient temperature, are compared to the corresponding test measurements. The results show that the model is able to: (i) calculate persistent dead-zones in PBX 9502 without recourse to any shock desensitisation treatment, and (ii) predict changes in corner turning behaviour with initial temperature using one set of coefficients.

  12. CREST modelling of PBX 9502 corner turning experiments at different initial temperatures

    NASA Astrophysics Data System (ADS)

    Whitworth, N. J.

    2014-05-01

    Corner turning is an important problem in regard to detonation wave propagation in TATB-based explosives. Experimentally, a sudden change in the direction of the propagating wave, such as turning a sharp corner, can result in dead-zones being left behind in the corner turn region, with the observed behaviour being particularly sensitive to the initial temperature of the explosive. In this paper, the entropy-dependent CREST reactive burn model is used to simulate corner turning experiments on the TATB-based explosive PBX 9502. Calculated results of double cylinder tests at three different initial temperatures (-54°C, ~23°C, and 75°C), and a "hockey puck" experiment at ambient temperature, are compared to the corresponding test measurements. The results show that the model is able to: (i) calculate persistent dead-zones in PBX 9502 without recourse to any shock desensitisation treatment, and (ii) predict changes in corner turning behaviour with initial temperature using one set of coefficients.

  13. Optimal descending, hypersonic turn to heading

    NASA Astrophysics Data System (ADS)

    Eisler, G. R.; Hull, D. G.

    Approximations are made to the point-mass equations of motion for flight within the atmosphere. Optimal controls are formulated for a reentry vehicle to execute a maximum-terminal-velocity turn to a specified heading while executing steep, descent trajectories. A Newton scheme is used repetitively to solve a nonlinear algebraic system for two parameters in the control equations to provide the on-line guidance. Trajectory comparisons from the repetitive solution of the optimal control problem, pure numerical optimization, and simulation of sample-data guidance show good agreement, if the atmospheric model is accurate.

  14. Genesis of a flexible turning center

    NASA Astrophysics Data System (ADS)

    Sanclemente, Paul; French, Robert D.

    GE - Aircraft Engines has designed, built, and is operating a flexible turning center for jet engine hardware. Although the plant is in the forefront of manufacturing technology development, it was intended from the start to be a production facility. So while there was much to learn from being involved in all phases of the project, meeting production schedules was, and is, key to its success. This paper reviews the early history of the project and ends with a view of its recent production status.

  15. Corning and Kroger turn whey to yeast

    SciTech Connect

    Not Available

    1981-11-16

    It is reported that Corning and Kroger intend to build a 35,000 sq. ft. plant in Winchester, Ky., that will turn whey into bakers' yeast. The plant will convert whey from Kroger's dairies into bakers' yeast, supplying about 60% of the yeast needed for nine Kroger bakeries. It will also produce syrups and whey protein concentrate for use in other food processing activities. In addition to making useful products, the project will convert the whey to glucose and galactose. The protein component of the whey will be concentrated and used in various foods and feeds.

  16. Solid-state turn coordinator display

    NASA Technical Reports Server (NTRS)

    Meredith, B. D.; Crouch, R. K.; Kelly, W. L., IV

    1975-01-01

    A solid state turn coordinator display which employs light emitting diodes (LED's) as the display medium was developed to demonstrate the feasibility of such displays for aircraft applications. The input to the display is supplied by a fluidic inertial rate sensor used in an aircraft wing leveler system. The display is composed of the LED radial display face and the electronics necessary to address and drive the individual lines of LED's. Three levels of brightness are provided to compensate for the different amounts of ambient light present in the cockpit.

  17. Optimal descending, hypersonic turn to heading

    SciTech Connect

    Eisler, G.R.; Hull, D.G.

    1986-01-01

    Approximations are made to the point-mass equations of motion for flight within the atmosphere. Optimal controls are formulated for a reentry vehicle to execute a maximum-terminal-velocity turn to a specified heading while executing steep, descent trajectories. A Newton scheme is used repetitively to solve a nonlinear algebraic system for two parameters in the control equations to provide the on-line guidance. Trajectory comparisons from the repetitive solution of the optimal control problem, pure numerical optimization, and simulation of sample-data guidance show good agreement, if the atmospheric model is accurate.

  18. The postmodern turn in group therapy.

    PubMed

    O'Leary, J V

    2001-10-01

    The postmodern critique, often referred to as social constructionism, has influenced nearly all disciplines, including recently the domain of psychology--and most particularly psychoanalysis. This article presents an exposition of the "postmodern turn," including some historical perspective, a description of its theoretical elements as related to psychological practice, as well as standard objections to its theories. This author believes that many of the concepts inherent to a social constructionist approach are compelling for theory and practice in group therapy. Clinical case studies are cited in describing how postmodern theories present a natural fit for group therapy. Furthermore, specific implications of this model are delineated for the arduous task of leading groups.

  19. Alchemical inflation: inflaton turns into Higgs

    SciTech Connect

    Nakayama, Kazunori; Takahashi, Fuminobu E-mail: fumi@tuhep.phys.tohoku.ac.jp

    2012-11-01

    We propose a new inflation model in which a gauge singlet inflaton turns into the Higgs condensate after inflation. The inflationary path is characterized by a moduli space of supersymmetric vacua spanned by the inflaton and Higgs field. The inflation energy scale is related to the soft supersymmetry breaking, and the Hubble parameter during inflation is smaller than the gravitino mass. The initial condition for the successful inflation is naturally realized by the pre-inflation in which the Higgs plays a role of the waterfall field.

  20. Winter Snowfall Turns an Emerald White

    NASA Technical Reports Server (NTRS)

    2001-01-01

    Ireland's climate is normally mild due to the nearby Gulf Stream, but the waning days of 2000 saw the Emerald Isle's green fields swathed in an uncommon blanket of white. The contrast between summer and winter is apparent in this pair of images of southwestern Ireland acquired by MISR's vertical-viewing (nadir) camera on August 23, 2000 (left) and December 29, 2000 (right). The corresponding Terra orbit numbers are 3628 and 5492, respectively.

    The year 2000 brought record-breaking weather to the British Isles. England and Wales experienced the wettest spring and autumn months since 1766. Despite being one of the warmest years in recent history, a cold snap arrived between Christmas and New Year's Day. According to the UK Meteorological Office, the 18 centimeters (7 inches) of snow recorded at Aldergrove, Northern Ireland, on December 27-28 was the deepest daily fall since 1930.

    Prominent geographical features visible in the MISR images include Galway Bay near the top left. Further south, the mouth of the River Shannon, the largest river in the British Isles, meets the Atlantic Ocean. In the lower portions of the images are the counties of Limerick, Kerry and Cork.

    MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology

  1. Left-handed Children in Singapore.

    ERIC Educational Resources Information Center

    Gan, Linda

    1998-01-01

    Used teacher questionnaires to examine incidence of left-handedness in nearly 2,800 Singaporean children, racial differences in this left-handed population, and educational provisions in preschool and primary school. Findings indicated that 7.5% of preschoolers and 6.3% of primary children were left-handed, with a higher proportion being Chinese…

  2. The Left-Handed: "Their Sinister" History.

    ERIC Educational Resources Information Center

    Costas, Elaine Fowler

    The history of left-handedness can provide teachers and parents a better understanding of left-handed children and give those children more pride in their difference. No child should be made to feel that he or she is abnormal because of using the left hand, although some specific instruction for these students is necessary in handwriting. Many…

  3. Pedal neuron 3 serves a significant role in effecting turning during crawling by the marine slug Tritonia diomedea (Bergh).

    PubMed

    Redondo, Roger L; Murray, James A

    2005-05-01

    The marine nudibranch Tritonia diomedea crawls using its ciliated foot surface as the sole means of propulsion. Turning while crawling involves raising a small portion of the lateral foot margin on the side of the turn. The cilia in the lifted area no longer contribute to propulsion, and this asymmetry in thrust turns the animal towards the lifted side. Neurons located in the pedal ganglia of the brain contribute to these foot margin contractions. T. diomedea has a natural tendency to turn upstream (rheotaxis), and pedal flexion neuron Pedal 3 elicits foot margin lift and receives modulatory input from flow receptors. To assess the contribution of this single cell in turning behavior, two fine wires were glued to the surface of the brain over left and right Pedal 3. We determined that Pedal 3 activity is correlated with subsequent ipsilateral turns, preceding the lift of the foot margin and the change in orientation by a consistent interval. Both Pedal 3 cells show synchronous bursts of activity, and the firing frequency of the ipsilateral Pedal 3 increased before turns were observed to that side. Stimulation of the electrode over Pedal 3 proved sufficient to elicit an ipsilateral turn in Tritonia. PMID:15778839

  4. Terminal retrograde turn of rolling rings

    NASA Astrophysics Data System (ADS)

    Jalali, Mir Abbas; Sarebangholi, Milad S.; Alam, Mohammad-Reza

    2015-09-01

    We report an unexpected reverse spiral turn in the final stage of the motion of rolling rings. It is well known that spinning disks rotate in the same direction of their initial spin until they stop. While a spinning ring starts its motion with a kinematics similar to disks, i.e., moving along a cycloidal path prograde with the direction of its rigid body rotation, the mean trajectory of its center of mass later develops an inflection point so that the ring makes a spiral turn and revolves in a retrograde direction around a new center. Using high speed imaging and numerical simulations of models featuring a rolling rigid body, we show that the hollow geometry of a ring tunes the rotational air drag resistance so that the frictional force at the contact point with the ground changes its direction at the inflection point and puts the ring on a retrograde spiral trajectory. Our findings have potential applications in designing topologically new surface-effect flying objects capable of performing complex reorientation and translational maneuvers.

  5. Analysis of forces in ultrasonically assisted turning

    NASA Astrophysics Data System (ADS)

    Ahmed, N.; Mitrofanov, A. V.; Babitsky, V. I.; Silberschmidt, V. V.

    2007-12-01

    Many modern engineering materials are very difficult to process with conventional machining methods. Ultrasonically assisted turning (UAT) is a new technology, where high frequency vibration (frequency f≈20 kHz, amplitude a≈15 μm) is superimposed on the movement of the cutting tool. Compared to conventional turning (CT), UAT allows significant improvements in processing many intractable materials, such as high-strength aerospace alloys and composites, by producing a noticeable decrease in cutting forces and a superior surface finish. Vibro-impact interaction between the tool and workpiece in UAT during the chip formation leads to a dynamically changing cutting force in the process zone as compared to the quasistatic one in CT. The paper presents an experimental study and computational (finite-element) model of both CT and UAT. Forces acting on the cutting tool in UAT are studied, and their dependence on vibration amplitude, frequency and vibration direction as well as on cutting parameters, such as feed rate and cutting speed, are investigated.

  6. Left-handed wrestlers are more successful.

    PubMed

    Ziyagil, Mehmet Akif; Gursoy, Recep; Dane, Senol; Yuksel, Ramazan

    2010-08-01

    It has been reported that there is a high proportion of left-handers among top athletes in different sports. In this study, the goal was to examine the rate of left-handedness in the top wrestlers at the world championships for achievement by left-handed wrestlers. The rate of left-handedness was higher in wrestlers with medal honors compared to wrestlers without medals for both men and women. The winning numbers and match degrees were higher in the left-handed wrestlers than in both right- and mixed-handed wrestlers among top international wrestlers.

  7. Left Atrial Appendage Closure Devices

    PubMed Central

    Romero, Jorge; Perez, Irving E; Krumerman, Andrew; Garcia, Mario J; Lucariello, Richard J

    2014-01-01

    Atrial fibrillation (AF) increases the risk for thromboembolic stroke five-fold. The left atrial appendage (LAA) has been shown to be the main source of thrombus formation in the majority of strokes associated with AF. Oral anticoagulation with warfarin and novel anticoagulants remains the standard of care; however, it has several limitations, including bleeding and poor compliance. Occlusion of the LAA has been shown to be an alternative therapeutic approach to drug therapy. The purpose of this article is to review the different techniques and devices that have emerged for the purpose of occluding this structure, with a particular emphasis on the efficacy and safety studies published to date in the medical literature. PMID:24963274

  8. Giant and thrombosed left ventricular aneurysm.

    PubMed

    de Agustin, Jose Alberto; de Diego, Jose Juan Gomez; Marcos-Alberca, Pedro; Rodrigo, Jose Luis; Almeria, Carlos; Mahia, Patricia; Luaces, Maria; Garcia-Fernandez, Miguel Angel; Macaya, Carlos; de Isla, Leopoldo Perez

    2015-07-26

    Left ventricular aneurysms are a frequent complication of acute extensive myocardial infarction and are most commonly located at the ventricular apex. A timely diagnosis is vital due to the serious complications that can occur, including heart failure, thromboembolism, or tachyarrhythmias. We report the case of a 78-year-old male with history of previous anterior myocardial infarction and currently under evaluation by chronic heart failure. Transthoracic echocardiogram revealed a huge thrombosed and calcified anteroapical left ventricular aneurysm. Coronary angiography demonstrated that the left anterior descending artery was chronically occluded, and revealed a big and spherical mass with calcified borders in the left hemithorax. Left ventriculogram confirmed that this spherical mass was a giant calcified left ventricular aneurysm, causing very severe left ventricular systolic dysfunction. The patient underwent cardioverter-defibrillator implantation for primary prevention.

  9. Giant and thrombosed left ventricular aneurysm

    PubMed Central

    de Agustin, Jose Alberto; de Diego, Jose Juan Gomez; Marcos-Alberca, Pedro; Rodrigo, Jose Luis; Almeria, Carlos; Mahia, Patricia; Luaces, Maria; Garcia-Fernandez, Miguel Angel; Macaya, Carlos; de Isla, Leopoldo Perez

    2015-01-01

    Left ventricular aneurysms are a frequent complication of acute extensive myocardial infarction and are most commonly located at the ventricular apex. A timely diagnosis is vital due to the serious complications that can occur, including heart failure, thromboembolism, or tachyarrhythmias. We report the case of a 78-year-old male with history of previous anterior myocardial infarction and currently under evaluation by chronic heart failure. Transthoracic echocardiogram revealed a huge thrombosed and calcified anteroapical left ventricular aneurysm. Coronary angiography demonstrated that the left anterior descending artery was chronically occluded, and revealed a big and spherical mass with calcified borders in the left hemithorax. Left ventriculogram confirmed that this spherical mass was a giant calcified left ventricular aneurysm, causing very severe left ventricular systolic dysfunction. The patient underwent cardioverter-defibrillator implantation for primary prevention. PMID:26225205

  10. Asymptomatic post-rheumatic giant left atrium

    PubMed Central

    Özkartal, Tardu; Tanner, Felix C; Niemann, Markus

    2016-01-01

    A 78-year-old asymptomatic woman was referred to our clinic for a second opinion regarding indication for mitral valve surgery. An echocardiogram showed a moderate mitral stenosis with a concomitant severe regurgitation. The most striking feature, however, was a giant left atrium with a parasternal anteroposterior diameter of 79 mm and a left atrial volume index of 364 mL/m². There are various echocardiographic definitions of a giant left atrium, which are mainly based on measurements of the anteroposterior diameter of the left atrium using M-mode in the parasternal long axis view. Since the commonly accepted method for echocardiographic evaluation of left atrial size is left atrial volume index, we propose a cut-off value of 140 mL/m2 for the definition of a “giant left atrium”. PMID:27354895

  11. Giant and thrombosed left ventricular aneurysm.

    PubMed

    de Agustin, Jose Alberto; de Diego, Jose Juan Gomez; Marcos-Alberca, Pedro; Rodrigo, Jose Luis; Almeria, Carlos; Mahia, Patricia; Luaces, Maria; Garcia-Fernandez, Miguel Angel; Macaya, Carlos; de Isla, Leopoldo Perez

    2015-07-26

    Left ventricular aneurysms are a frequent complication of acute extensive myocardial infarction and are most commonly located at the ventricular apex. A timely diagnosis is vital due to the serious complications that can occur, including heart failure, thromboembolism, or tachyarrhythmias. We report the case of a 78-year-old male with history of previous anterior myocardial infarction and currently under evaluation by chronic heart failure. Transthoracic echocardiogram revealed a huge thrombosed and calcified anteroapical left ventricular aneurysm. Coronary angiography demonstrated that the left anterior descending artery was chronically occluded, and revealed a big and spherical mass with calcified borders in the left hemithorax. Left ventriculogram confirmed that this spherical mass was a giant calcified left ventricular aneurysm, causing very severe left ventricular systolic dysfunction. The patient underwent cardioverter-defibrillator implantation for primary prevention. PMID:26225205

  12. Asymptomatic post-rheumatic giant left atrium.

    PubMed

    Özkartal, Tardu; Tanner, Felix C; Niemann, Markus

    2016-06-26

    A 78-year-old asymptomatic woman was referred to our clinic for a second opinion regarding indication for mitral valve surgery. An echocardiogram showed a moderate mitral stenosis with a concomitant severe regurgitation. The most striking feature, however, was a giant left atrium with a parasternal anteroposterior diameter of 79 mm and a left atrial volume index of 364 mL/m². There are various echocardiographic definitions of a giant left atrium, which are mainly based on measurements of the anteroposterior diameter of the left atrium using M-mode in the parasternal long axis view. Since the commonly accepted method for echocardiographic evaluation of left atrial size is left atrial volume index, we propose a cut-off value of 140 mL/m(2) for the definition of a "giant left atrium".

  13. Beam diagnostics via model independent analysis of the turn-by-turn BPM data

    SciTech Connect

    Xi Yang

    2004-08-11

    Model independent analysis (MIA) can be used to obtain all the eigen modes included in the turn-by-turn BPM data. Not only the synchrotron tune and betatron tune can be obtained from the fast Fourier transforms (FFT) of the temporal eigen vector of the corresponding mode, but also the error mode, which could be caused by the different gain of a BPM, can be observed in both the temporal and spatial eigen vectors of the error mode. It can be applied as a diagnostic tool for Booster.

  14. Utilizing the N beam position monitor method for turn-by-turn optics measurements

    NASA Astrophysics Data System (ADS)

    Langner, A.; Benedetti, G.; Carlà, M.; Iriso, U.; Martí, Z.; de Portugal, J. Coello; Tomás, R.

    2016-09-01

    The N beam position monitor method (N -BPM) which was recently developed for the LHC has significantly improved the precision of optics measurements that are based on BPM turn-by-turn data. The main improvement is due to the consideration of correlations for statistical and systematic error sources, as well as increasing the amount of BPM combinations which are used to derive the β -function at one location. We present how this technique can be applied at light sources like ALBA, and compare the results with other methods.

  15. Left and Right Ventricle Leads Switch as a Solution for T Wave Oversensing - How a Good Idea Turned Out Bad

    PubMed Central

    Alzand, BSN; Phlips, TJE; Willems, R

    2014-01-01

    A 50-year-old male with a CRT defibrillator received inappropriate ICD shocks due to T-wave oversensing. Decreasing the sensitivity to avoid T wave oversensing was not an option due to a suboptimal R-wave sensing amplitude. We decided to re-plug the LV lead in the RV port and the RV lead in the LV port. This however led to intermittent phrenic nerve stimulation due to mandatory bipolar (tip-ring) or unipolar (tip-can) pacing on the LV-lead from the RV port. Re-intervention was necessary with the implantation of an additional pacing/sensing RV lead. A software programmable choice to switch sensing and tachycardia detection from RV to LV lead could be a valuable feature in future CRT devices. PMID:24920871

  16. Hard turning micro-machine tool

    DOEpatents

    DeVor, Richard E; Adair, Kurt; Kapoor, Shiv G

    2013-10-22

    A micro-scale apparatus for supporting a tool for hard turning comprises a base, a pivot coupled to the base, an actuator coupled to the base, and at least one member coupled to the actuator at one end and rotatably coupled to the pivot at another end. A tool mount is disposed on the at least one member. The at least one member defines a first lever arm between the pivot and the tool mount, and a second lever arm between the pivot and the actuator. The first lever arm has a length that is less than a length of the second lever arm. The actuator moves the tool mount along an arc.

  17. Research on silicon rotor turned gyroscope

    NASA Astrophysics Data System (ADS)

    Cao, Huiliang; Li, Hongsheng; Yang, Bo; Wang, Shourong; Li, Kunyu

    2013-03-01

    This paper introduces a novel thin silicon rotor turned gyroscope (SRTG). With a micro motor driving the rotor and two pairs of torsion bars and a gimbal ring realizing dynamical tuning, this gyroscope inherits the structure and working principle of the dynamically tuned gyroscope (DTG). The torsion bars, gimbal ring, rotor, annunciator and torquer are processed by micro-mechanical technology. The declination of rotor is sensed by differential capacitances. The rotor is rebalanced by electrostatic forces. In this paper, the details about the structure and working principle of SRTG is presented, the block diagram of the circuit in SRTG is discussed. Experiments are done on one sensitive direction of SRTG, and the curve is given, proved the feasibility.

  18. Chatter detection in turning using persistent homology

    NASA Astrophysics Data System (ADS)

    Khasawneh, Firas A.; Munch, Elizabeth

    2016-03-01

    This paper describes a new approach for ascertaining the stability of stochastic dynamical systems in their parameter space by examining their time series using topological data analysis (TDA). We illustrate the approach using a nonlinear delayed model that describes the tool oscillations due to self-excited vibrations in turning. Each time series is generated using the Euler-Maruyama method and a corresponding point cloud is obtained using the Takens embedding. The point cloud can then be analyzed using a tool from TDA known as persistent homology. The results of this study show that the described approach can be used for analyzing datasets of delay dynamical systems generated both from numerical simulation and experimental data. The contributions of this paper include presenting for the first time a topological approach for investigating the stability of a class of nonlinear stochastic delay equations, and introducing a new application of TDA to machining processes.

  19. Turning Algae into Energy in New Mexico

    ScienceCinema

    Sayre, Richard; Olivares, Jose; Lammers, Peter

    2016-07-12

    Los Alamos National Laboratory, as part of the New Mexico Consortium - comprised of New Mexico's major research universities, the Lab, and key industry partners - is conducting research into using algae as a feed stock for a renewable source of fuels, and other products. There are hundreds of thousands of different algae species on Earth. They account for approximately half of the net photosynthesis on the planet, yet they have not been used in any kind of a large scale by humanity, with just a few exceptions. And yet, the biomass is easy to transform into useful products, including fuels, and they contain many other natural products that have high value. In this video Los Alamos and New Mexico State University scientists outline the opportunities and challenges of using science to turn algae into energy.

  20. Turning Algae into Energy in New Mexico

    SciTech Connect

    Sayre, Richard; Olivares, Jose; Lammers, Peter

    2013-07-29

    Los Alamos National Laboratory, as part of the New Mexico Consortium - comprised of New Mexico's major research universities, the Lab, and key industry partners - is conducting research into using algae as a feed stock for a renewable source of fuels, and other products. There are hundreds of thousands of different algae species on Earth. They account for approximately half of the net photosynthesis on the planet, yet they have not been used in any kind of a large scale by humanity, with just a few exceptions. And yet, the biomass is easy to transform into useful products, including fuels, and they contain many other natural products that have high value. In this video Los Alamos and New Mexico State University scientists outline the opportunities and challenges of using science to turn algae into energy.

  1. Aberrant left subclavian artery associated with a Kommerell's diverticulum and a left-sided aortic arch.

    PubMed

    Yu, Pey-Jen; Balsam, Leora B; Mussa, Firas F; DeAnda, Abe

    2012-09-01

    Kommerell's diverticulum is most commonly associated with either an aberrant left subclavian artery from a right-sided aortic arch or an aberrant right subclavian artery from a left-sided aortic arch. We describe an exceedingly rare case of an aberrant left subclavian artery arising from a Kommerell's diverticulum in a patient with a left-sided aortic arch, the "nonaberrant aberrant left subclavian artery."

  2. 14 CFR 23.203 - Turning flight and accelerated turning stalls.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... landing configuration at maximum landing weight and a speed of 1.4 VSO, except that the power may not be... a 30 degree bank. Reduce speed by steadily and progressively tightening the turn with the elevator until the airplane is stalled, as defined in § 23.201(b). The rate of speed reduction must be...

  3. 14 CFR 23.203 - Turning flight and accelerated turning stalls.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... the power required for level flight in the landing configuration at maximum landing weight and a speed... maximum landing weight and a speed of 1.4 VSO, except that the power may not be less than 50 percent of... tests as follows: (a) Establish and maintain a coordinated turn in a 30 degree bank. Reduce speed...

  4. Turn-by-Turn Imaging of the Transverse Beam Profile in PEP-II

    SciTech Connect

    Fisher, Alan A.; Petree, Mark; /SLAC

    2006-12-18

    During injection or instability, the transverse profile of an individual bunch in a storage ring can change significantly in a few turns. However, most synchrotron-light imaging techniques are not designed for this time scale. We have developed a novel diagnostic that enhances the utility of a fast gated camera by adding, inexpensively, some features of a dual-axis streak camera, in order to watch the turn-by-turn evolution of the transverse profile, in both x and y. The beam's elliptical profile is reshaped using cylindrical lenses to form a tall and narrow ellipse--essentially the projection of the full ellipse onto one transverse axis. We do this projection twice, by splitting the beam into two paths at different heights, and rotating the ellipse by 90{sup o} on one path. A rapidly rotating mirror scans these vertical ''pencils'' of light horizontally across the photocathode of the camera, which is gated for 3 ns on every Nth ring turn. A single readout of the camera captures 100 images, looking like a stroboscopic photograph of a moving object. We have observed the capture of injected charge into a bunch and the rapid change of beam size at the onset of a fast instability.

  5. Why Critical Literacy Should Turn to "The Affective Turn": Making a Case for Critical Affective Literacy

    ERIC Educational Resources Information Center

    Anwaruddin, Sardar M.

    2016-01-01

    The central argument of this essay is that critical literacy with a rationalistic bent may not enable us to cope with ethical dilemmas in our responsiveness to human sufferings. I argue that critical literacy education would benefit from turning to the recent scholarship on affect/emotion studies. I draw upon the works of Sara Ahmed--one of the…

  6. Turning the corner in fertility: high DNA integrity of boundary-following sperm.

    PubMed

    Eamer, Lise; Vollmer, Marion; Nosrati, Reza; San Gabriel, Maria C; Zeidan, Krista; Zini, Armand; Sinton, David

    2016-07-01

    We present a passive microfluidic sperm selection strategy that collects motile sperm based on their preference to follow boundaries and turn corners. Clinical assessment of selected human sperm from the device revealed a strong correlation between high DNA integrity and the tendency for sperm to follow boundaries. Human sperm with preference to follow boundaries on the left- or right-hand sides have higher (>51%) DNA integrity than straight swimmers and significantly higher (>67%) DNA integrity than sperm in raw semen. Boundary following behaviour offers a strategy to selecting sperm with the highest DNA integrity to improve the success rate of assisted reproduction. PMID:27241827

  7. [TURNING THE PYRAMID IN PRENATAL CARE].

    PubMed

    Ohel-Shani, Iris; Daniel-Spiegel, Etty

    2015-10-01

    Most complications of pregnancy manifest towards the latter part of pregnancy. Nevertheless, present day diagnostic techniques, such as sonography, Doppler, biochemical screening tests, and the newly developed ability to study free fetal DNA in maternal blood, enables early identification of high risk groups for maternal and fetal morbidity, as well as fetal genetic and anatomical pathology. Dr. Nicolaides has coined this changing trend with the term "Turning the Pyramid". Early screening enables earlier and more directed follow-up with the application of relevant diagnostic tests. Obvious advantages include the potential to reduce maternal-fetal morbidity before it becomes apparent clinically. Additionally, the earlier diagnosis of fetal pathology, allows more time for parents and medical staff to assess the situation, and reach a decision regarding the continuation of the pregnancy. A possible drawback of such an approach, of early identification of high risk groups, is the uncertainty it arouses, sometimes for a long duration, with the accompanying apprehension and stress parents have to endure. A multidisciplinary team, consisting of specialists in fetal-maternal medicine, genetics, ultrasound, and perinatology, will be needed in order to best deal with the often complex information, which is becoming increasingly available at a very early stage of pregnancy.

  8. THE NEOLIBERAL TURN IN AMERICAN HEALTH CARE.

    PubMed

    Gaffney, Adam

    2015-01-01

    Leaving millions both uninsured and underinsured, the Affordable Care Act does not create a system of universal health care in the United States. To understand its shortcomings, we have to understand it as part of a historic shift in the political economy of American health care. This "neoliberal turn" began as a reaction against the welfare state as it expanded during the New Deal and post-World War II period. What began as a movement associated with philosophers like Friedrich Hayek ultimately had a powerful impact via the attraction of powerful corporate sponsors and political supporters, and it was to historically transform American health care thought and organization. In health policy circles, for example, it can be seen in a rising emphasis on "moral hazard," overuse, and cost sharing above a concern with universalism and equity. It was likewise manifested by the corporatization of the health maintenance organization and the rise of the "consumer-driven" health care movement. By the time of the health care reform debate, the influence of corporate "stakeholders" was to prove predominant. These developments, however, must be construed as connected parts of a much larger political transformation, reflected in rising inequality and privatization, occurring both domestically and internationally. PMID:26460446

  9. Maize Leaves Turn Away from Neighbors1

    PubMed Central

    Maddonni, Gustavo Angel; Otegui, María Elena; Andrieu, Bruno; Chelle, Michael; Casal, Jorge J.

    2002-01-01

    In commercial crops, maize (Zea mays) plants are typically grown at a larger distance between rows (70 cm) than within the same row (16–23 cm). This rectangular arrangement creates a heterogeneous environment in which the plants receive higher red light (R) to far-red light (FR) ratios from the interrow spaces. In field crops, the hybrid Dekalb 696 (DK696) showed an increased proportion of leaves toward interrow spaces, whereas the experimental hybrid 980 (Exp980) retained random leaf orientation. Mirrors reflecting FR were placed close to isolated plants to simulate the presence of neighbors in the field. In addition, localized FR was applied to target leaves in a growth chamber. During their expansion, the leaves of DK696 turned away from the low R to FR ratio signals, whereas Exp980 leaves remained unaffected. On the contrary, tillering was reduced and plant height was increased by low R to FR ratios in Exp980 but not in DK696. Isolated plants preconditioned with low R/FR-simulating neighbors in a North-South row showed reduced mutual shading among leaves when the plants were actually grouped in North-South rows. These observations contradict the current view that phytochrome-mediated responses to low R/FR are a relic from wild conditions, detrimental for crop yield. PMID:12427985

  10. THE NEOLIBERAL TURN IN AMERICAN HEALTH CARE.

    PubMed

    Gaffney, Adam

    2015-01-01

    Leaving millions both uninsured and underinsured, the Affordable Care Act does not create a system of universal health care in the United States. To understand its shortcomings, we have to understand it as part of a historic shift in the political economy of American health care. This "neoliberal turn" began as a reaction against the welfare state as it expanded during the New Deal and post-World War II period. What began as a movement associated with philosophers like Friedrich Hayek ultimately had a powerful impact via the attraction of powerful corporate sponsors and political supporters, and it was to historically transform American health care thought and organization. In health policy circles, for example, it can be seen in a rising emphasis on "moral hazard," overuse, and cost sharing above a concern with universalism and equity. It was likewise manifested by the corporatization of the health maintenance organization and the rise of the "consumer-driven" health care movement. By the time of the health care reform debate, the influence of corporate "stakeholders" was to prove predominant. These developments, however, must be construed as connected parts of a much larger political transformation, reflected in rising inequality and privatization, occurring both domestically and internationally.

  11. Turning and maneuverability during sidewinding locomotion

    NASA Astrophysics Data System (ADS)

    Astley, Henry; Goldman, Daniel; Hu, David

    2014-03-01

    Sidewinding is an unusual form of snake locomotion used to move rapidly on yielding substrates such as desert sands. Posteriorly propagating waves alternate between static contact with the substrate and elevated motion, resulting in a ``stepping'' motion of body segments. Unlike lateral undulation, the direction of travel is not collinear with the axis of the body wave, and posterior body segments do not follow the path of anterior segments. Field observations indicate that sidewinding snakes are highly maneuverable, but the mechanisms by which these snakes change direction during this complex movement are unknown. Motion capture data from three Colorado Desert sidewinder rattlesnakes (Crotalus cerastes laterorepens) shows a variety of turn magnitudes and behaviors. Additionally, sidewinders are capable of ``reversals'' in which the snakes halts forward progress and begins locomotion in the opposite direction without rotation of the body. Because the head is re-oriented with respect to the body during these reversals, the snake is able to reverse direction without rotation yet continue moving in the new direction without impediment to perception or mechanics, a rare level of maneuverability in animals.

  12. Nomogram for calculation of left ventricular volumes.

    PubMed Central

    Saksena, F B; Saksena, G B

    1977-01-01

    A nomogram has been devised for the rapid derivation of left ventricular volumes from single-plane angiograms obtained in the 30 degrees right anterior oblique projection. The left ventricular volumes are derived from the use of the area-length formula of Dodge. The computed left ventricular volumes may then be adjusted to correspond to the actual volumes by an appropriate conversion chart. PMID:911567

  13. History of Education in Canada: Historiographic "Turns" and Widening Horizons

    ERIC Educational Resources Information Center

    Bruno-Jofré, Rosa

    2014-01-01

    This paper explores major historiographic "turns" in history of education with a focus, although not exclusively, on English-speaking Canada. It addresses the transformative intellectual impact of the turn toward social history on the history of education, the impact of cultural history and the linguistic turn, the reception of Michel…

  14. Turn Openings in Academic Talk: Where Goals and Roles Intersect

    ERIC Educational Resources Information Center

    Evison, Jane

    2013-01-01

    This study uses Corpus Linguistic (CL) techniques to explore multiple turn openings in conjunction with comparative measures of turn-initial priming (the proportion of occurrences of a form that are turn-initial). Using a benchmark corpus of casual conversation as a point of comparison, six frequent items which have a particularly strong affinity…

  15. Optimisation of clarifier-thickeners processing stable suspensions for turn-up/turn-down.

    PubMed

    Martin, Alastair D

    2004-03-01

    Solid-liquid separation equipment operating on wastewater duties seldom functions at steady state and may be expected to perform over a wide range of feed loads. Satisfactory control of the solids residence time in these clarifiers and thickeners is critical to their successful operation. High solids residence times can lead to hydrolysis and rising sludge. This paper addresses the design of clarifiers and thickeners with minimum solids residence times. A one-dimensional force balance theory of sedimentation is used as the basis for the optimal design. Turn-up and turn-down are considered directly within the optimisation. A robust algorithm is presented for the repeated solution of the design equations and the constrained optimisation of the solids residence time. Three types controlling phenomena are identified and illustrated with design cases. The designs are found to be taller with smaller plan areas than their point optimised equivalents.

  16. Application of the lie-transform perturbation theory for the turn-by-turn data analysis

    SciTech Connect

    Alexahin, Y.; /Fermilab

    2006-06-01

    Harmonic analysis of turn-by-turn BPM data is a rich source of information on linear and nonlinear optics in circular machines. In the present report the normal form approach first introduced by R. Bartolini and F. Schmidt is extended on the basis of the Lie-transform perturbation theory to provide direct relation between the sources of perturbation and observable spectra of betatron oscillations. The goal is to localize strong perturbing elements, find the resonance driving terms--both absolute value and phase--that are necessary for calculation of the required adjustments in correction magnet circuits: e.g. skew-quadrupoles for linear coupling correction. The theory is nonlinear and permits to analyze higher order effects, such as coupling contribution to beta-beating and nonlinear sum resonances.

  17. Validation of PEP-II Resonantly Excited Turn-by-Turn BPM Data

    SciTech Connect

    Yan, Yiton T.; Cai, Yunhai; Colocho, William.; Decker, Franz-Josef; /SLAC

    2007-06-28

    For optics measurement and modeling of the PEP-II electron (HER) and position (LER) storage rings, we have been doing well with MIA [1] which requires analyzing turn-by-turn Beam Position Monitor (BPM) data that are resonantly excited at the horizontal, vertical, and longitudinal tunes. However, in anticipation that certain BPM buttons and even pins in the PEP-II IR region would be missing for the run starting in January 2007, we had been developing a data validation process to reduce the effect due to the reduced BPM data accuracy on PEP-II optics measurement and modeling. Besides the routine process for ranking BPM noise level through data correlation among BPMs with a singular-value decomposition (SVD), we could also check BPM data symplecticity by comparing the invariant ratios. Results from PEP-II measurement will be presented.

  18. Model-independent analysis of the Fermilab Tevatron turn-by-turn beam position monitor measurements

    SciTech Connect

    Petrenko, A.V.; Valishev, A.A.; Lebedev, V.A.; /Fermilab

    2011-09-01

    Coherent transverse beam oscillations in the Tevatron were analyzed with the model-independent analysis (MIA) technique. This allowed one to obtain the model-independent values of coupled betatron amplitudes, phase advances, and dispersion function around the ring from a single dipole kick measurement. In order to solve the MIA mode mixing problem which limits the accuracy of determination of the optical functions, we have developed a new technique of rotational MIA mode untangling. The basic idea is to treat each beam position monitor (BPM) as two BPMs separated in a ring by exactly one turn. This leads to a simple criterion of MIA mode separation: the betatron phase advance between any BPM and its counterpart shifted by one turn should be equal to the betatron tune and therefore should not depend on the BPM position in the ring. Furthermore, we describe a MIA-based technique to locate vibrating magnets in a storage ring.

  19. Turn-Initial versus Turn-Final Laughter: Two Techniques for Initiating Remedy in English/Italian Bookshop Service Encounters.

    ERIC Educational Resources Information Center

    Gavioli, Laura

    1995-01-01

    Analyzes patterns of laughter in bookshop service encounters in England and Italy. Finds that in the English corpus, laughter is recurrently turn-initial, anticipating an account by the assistant in the same turn, whereas in the Italian corpus it is recurrently turn-final, leaving to the customer the possibility of eliciting an account and/or an…

  20. Extension of the classical classification of β-turns.

    PubMed

    de Brevern, Alexandre G

    2016-01-01

    The functional properties of a protein primarily depend on its three-dimensional (3D) structure. These properties have classically been assigned, visualized and analysed on the basis of protein secondary structures. The β-turn is the third most important secondary structure after helices and β-strands. β-turns have been classified according to the values of the dihedral angles φ and ψ of the central residue. Conventionally, eight different types of β-turns have been defined, whereas those that cannot be defined are classified as type IV β-turns. This classification remains the most widely used. Nonetheless, the miscellaneous type IV β-turns represent 1/3(rd) of β-turn residues. An unsupervised specific clustering approach was designed to search for recurrent new turns in the type IV category. The classical rules of β-turn type assignment were central to the approach. The four most frequently occurring clusters defined the new β-turn types. Unexpectedly, these types, designated IV1, IV2, IV3 and IV4, represent half of the type IV β-turns and occur more frequently than many of the previously established types. These types show convincing particularities, in terms of both structures and sequences that allow for the classical β-turn classification to be extended for the first time in 25 years. PMID:27627963

  1. Extension of the classical classification of β-turns

    PubMed Central

    de Brevern, Alexandre G.

    2016-01-01

    The functional properties of a protein primarily depend on its three-dimensional (3D) structure. These properties have classically been assigned, visualized and analysed on the basis of protein secondary structures. The β-turn is the third most important secondary structure after helices and β-strands. β-turns have been classified according to the values of the dihedral angles φ and ψ of the central residue. Conventionally, eight different types of β-turns have been defined, whereas those that cannot be defined are classified as type IV β-turns. This classification remains the most widely used. Nonetheless, the miscellaneous type IV β-turns represent 1/3rd of β-turn residues. An unsupervised specific clustering approach was designed to search for recurrent new turns in the type IV category. The classical rules of β-turn type assignment were central to the approach. The four most frequently occurring clusters defined the new β-turn types. Unexpectedly, these types, designated IV1, IV2, IV3 and IV4, represent half of the type IV β-turns and occur more frequently than many of the previously established types. These types show convincing particularities, in terms of both structures and sequences that allow for the classical β-turn classification to be extended for the first time in 25 years. PMID:27627963

  2. Extension of the classical classification of β-turns.

    PubMed

    de Brevern, Alexandre G

    2016-09-15

    The functional properties of a protein primarily depend on its three-dimensional (3D) structure. These properties have classically been assigned, visualized and analysed on the basis of protein secondary structures. The β-turn is the third most important secondary structure after helices and β-strands. β-turns have been classified according to the values of the dihedral angles φ and ψ of the central residue. Conventionally, eight different types of β-turns have been defined, whereas those that cannot be defined are classified as type IV β-turns. This classification remains the most widely used. Nonetheless, the miscellaneous type IV β-turns represent 1/3(rd) of β-turn residues. An unsupervised specific clustering approach was designed to search for recurrent new turns in the type IV category. The classical rules of β-turn type assignment were central to the approach. The four most frequently occurring clusters defined the new β-turn types. Unexpectedly, these types, designated IV1, IV2, IV3 and IV4, represent half of the type IV β-turns and occur more frequently than many of the previously established types. These types show convincing particularities, in terms of both structures and sequences that allow for the classical β-turn classification to be extended for the first time in 25 years.

  3. Turning the tables: language and spatial reasoning.

    PubMed

    Li, Peggy; Gleitman, Lila

    2002-04-01

    This paper investigates possible influences of the lexical resources of individual languages on the spatial organization and reasoning styles of their users. That there are such powerful and pervasive influences of language on thought is the thesis of the Whorf-Sapir linguistic relativity hypothesis which, after a lengthy period in intellectual limbo, has recently returned to prominence in the anthropological, linguistic, and psycholinguistic literatures. Our point of departure is an influential group of cross-linguistic studies that appear to show that spatial reasoning is strongly affected by the spatial lexicon in everyday use in a community (e.g. Brown, P., & Levinson, S. C. (1993). Linguistic and nonlinguistic coding of spatial arrays: explorations in Mayan cognition (Working Paper No. 24). Nijmegen: Cognitive Anthropology Research Group, Max Planck Institute for Psycholinguistics; Cognitive Linguistics 6 (1995) 33). Specifically, certain groups customarily use an externally referenced spatial-coordinate system to refer to nearby directions and positions ("to the north") whereas English speakers usually employ a viewer-perspective system ("to the left"). Prior findings and interpretations have been to the effect that users of these two types of spatial system solve rotation problems in different ways, reasoning strategies imposed by habitual use of the language-particular lexicons themselves. The present studies reproduce these different problem-solving strategies in speakers of a single language (English) by manipulating landmark cues, suggesting that language itself may not be the key causal factor in choice of spatial perspective. Prior evidence on rotation problem solution from infants (e.g. Acredolo, L.P. (1979). Laboratory versus home: the effect of environment on the 9-month-old infant's choice of spatial reference system. Developmental Psychology, 15 (6), 666-667) and from laboratory animals (e.g. Restle, F. (1975). Discrimination of cues in mazes: a

  4. Influence of body morphology on turning behavior in carnivores.

    PubMed

    Eilam, D

    1994-03-01

    The present work illustrates how three carnivore species with different body morphologies differ in the performance of a basic motor component-turning. Marbled polecats, which have an elongated and slender trunk, turn while sharply bending the trunk laterally. Grey wolves possess elongated legs and turn by maneuvering with their legs while slightly bending the trunk laterally and lowering the head to contact the ground. Honey badgers feature a wide and massive bear-like shape and rarely bend the trunk, but rather turn either by maneuvering with their legs or while elevating parts of the trunk in the vertical domain. It is suggested that these strategies shorten the radius of turning and thus reduce the moment of inertia. A lower moment of inertia may optimize turning behavior in terms of speed, energy cost, and the smoothness of transition between turning and bouts of forward progression or arrest. PMID:15757828

  5. Influence of body morphology on turning behavior in carnivores.

    PubMed

    Eilam, D

    1994-03-01

    The present work illustrates how three carnivore species with different body morphologies differ in the performance of a basic motor component-turning. Marbled polecats, which have an elongated and slender trunk, turn while sharply bending the trunk laterally. Grey wolves possess elongated legs and turn by maneuvering with their legs while slightly bending the trunk laterally and lowering the head to contact the ground. Honey badgers feature a wide and massive bear-like shape and rarely bend the trunk, but rather turn either by maneuvering with their legs or while elevating parts of the trunk in the vertical domain. It is suggested that these strategies shorten the radius of turning and thus reduce the moment of inertia. A lower moment of inertia may optimize turning behavior in terms of speed, energy cost, and the smoothness of transition between turning and bouts of forward progression or arrest.

  6. Time Components of the Left Ventricle.

    ERIC Educational Resources Information Center

    Franks, B. Don

    The purpose of this study was to examine the relationship of the time components of the left ventricle. Since one of the ways to investigate cardiac function is to analyze the time intervals between particular events of the cardiac cycle, various time intervals of systole and diastole of the left ventricle were measured from simultaneous…

  7. A Conversation about No Child Left Behind

    ERIC Educational Resources Information Center

    Taylor, Brian

    2007-01-01

    This article presents an interview with J. Michael Ortiz, a member of the Aspen Institute's Commission on No Child Left Behind, on the issues concerning the No Child Left Behind Act (NCLB). Aspen Institute's Commission is an independent panel that was established in 2006 to conduct a high-level review of the federal government's signature…

  8. Pure Left Neglect for Arabic Numerals

    ERIC Educational Resources Information Center

    Priftis, Konstantinos; Albanese, Silvia; Meneghello, Francesca; Pitteri, Marco

    2013-01-01

    Arabic numerals are diffused and language-free representations of number magnitude. To be effectively processed, the digits composing Arabic numerals must be spatially arranged along a left-to-right axis. We studied one patient (AK) to show that left neglect, after right hemisphere damage, can selectively impair the computation of the spatial…

  9. Coronary haemodynamics in left ventricular hypertrophy.

    PubMed Central

    Wallbridge, D. R.; Cobbe, S. M.

    1996-01-01

    BACKGROUND: Left ventricular hypertrophy is associated with an increased risk of cardiovascular morbidity and mortality. Previous studies have shown that patients with left ventricular hypertrophy develop electrocardiographic changes and left ventricular dysfunction during acute hypotension, and suggest that the lower end of autoregulation may be shifted upwards. AIM: To measure coronary blood flow (velocity) and flow reserve during acute hypotension in patients with left ventricular hypertrophy. PATIENTS: Eight patients with atypical chest pain and seven with hypertensive left ventricular hypertrophy; all with angiographically normal epicardial vessels. SETTING: Tertiary referral centre. METHODS: The physiological range of blood pressure was determined by previous ambulatory monitoring. Left ventricular mass was determined by echocardiography. At cardiac catheterisation, left coronary blood flow velocity was measured using a Judkins style Doppler tipped catheter. During acute hypotension with sodium nitroprusside, coronary blood flow velocity was recorded at rest and during maximal hyperaemia induced by intracoronary injection of adenosine. Quantitative coronary angiography was performed manually. RESULTS: For both groups coronary blood flow velocity remained relatively constant over a range of physiological diastolic blood pressures and showed a steep relation with diastolic blood pressure during maximal hyperaemia with intracoronary adenosine. Absolute coronary blood flow (calculated from quantitative angiographic data), standardised for left ventricular mass, showed reduced flow in the hypertensive group at rest and during maximal vasodilatation. CONCLUSION: The results are consistent with an inadequate blood supply to the hypertrophied heart, but no upward shift of the lower end of the autoregulatory range was observed. PMID:8705764

  10. Pure Left Neglect for Arabic Numerals

    ERIC Educational Resources Information Center

    Priftis, Konstantinos; Albanese, Silvia; Meneghello, Francesca; Pitteri, Marco

    2013-01-01

    Arabic numerals are diffused and language-free representations of number magnitude. To be effectively processed, the digits composing Arabic numerals must be spatially arranged along a left-to-right axis. We studied one patient (AK) to show that left neglect, after right hemisphere damage, can selectively impair the computation of the spatial…

  11. Are Some of Your Students "Left" Out?

    ERIC Educational Resources Information Center

    White, Kathryn

    1986-01-01

    This article examines the role that handedness may play in skill development in typewriting and shorthand courses. Teaching procedures that appear to discriminate against the left-handed student will be examined. Also, the positioning of supplies--left or right side--and the use of right-handed equipment are examined. (CT)

  12. Teaching Left Handers the Write Stuff.

    ERIC Educational Resources Information Center

    Wasylyk, Thomas M.

    1989-01-01

    Suggests several strategies for producing fluent, legible penmanship for both left and right handed students. Observes that reading readiness skills can be reinforced through handwriting instruction. Describes several physical considerations for successful writing, and notes the modifications needed for left handed writers. (MM)

  13. Age-related modifications in steering behaviour: effects of base-of-support constraints at the turn point.

    PubMed

    Paquette, Maxime R; Fuller, Jason R; Adkin, Allan L; Vallis, Lori Ann

    2008-09-01

    This study investigated the effects of altering the base of support (BOS) at the turn point on anticipatory locomotor adjustments during voluntary changes in travel direction in healthy young and older adults. Participants were required to walk at their preferred pace along a 3-m straight travel path and continue to walk straight ahead or turn 40 degrees to the left or right for an additional 2-m. The starting foot and occasionally the gait starting point were adjusted so that participants had to execute the turn using a cross-over step with a narrow BOS or a lead-out step with a wide BOS. Spatial and temporal gait variables, magnitudes of angular segmental movement, and timing and sequencing of body segment reorientation were similar despite executing the turn with a narrow or wide BOS. A narrow BOS during turning generated an increased step width in the step prior to the turn for both young and older adults. Age-related changes when turning included reduced step velocity and step length for older compared to young adults. Age-related changes in the timing and sequencing of body segment reorientation prior to the turn point were also observed. A reduction in walking speed and an increase in step width just prior to the turn, combined with a delay in motion of the center of mass suggests that older adults used a more cautious combined foot placement and hip strategy to execute changes in travel direction compared to young adults. The results of this study provide insight into mobility constraints during a common locomotor task in older adults.

  14. Unprotected left main distal bifurcation lesion.

    PubMed

    Karavolias, George; Karyofillis, Panagiotis; Georgiadou, Panagiota; Voudris, Vassilis

    2012-01-01

    Left main coronary artery disease is a high-risk condition with significant mortality. Currently, bypass surgery is considered the gold-standard treatment for unprotected left main disease. The introduction of drugeluting stents for the treatment of coronary artery disease has proved to reduce the rates of restenosis and, consequently, the need for repeat revascularisation; therefore, recently, percutaneous coronary intervention in the unprotected left main using drug-eluting stents has been considered another therapeutic option for patients at high risk for bypass surgery, or for patients who simply refuse bypass surgery. Based on the updated guidelines on myocardial revascularisation of the European Society of Cardiology, treating left main lesions by angioplasty is feasible and safe in selected patients. In this case report we demonstrate the successful implantation of drug-eluting stents for the treatment of an unprotected left main bifurcation lesion in an 85-year-old patient with high perioperative risk.

  15. Partial left pericardial defect with herniation of the left atrial appendage

    PubMed Central

    Pernot, C.; Hoeffel, J C.; Henry, M.; Frisch, R.; Brauer, B.

    1972-01-01

    A case is reported of herniation of the left atrial appendage through a partial pericardial defect, probably congenital. The diagnosis was suggested by the history of chest pain and bulging of the middle segment of the left heart border on the plain chest film, without other signs. Angiography revealed a dilated left atrial appendage. An artificial left pneumothorax confirmed the presence of a pleuropericardial defect. The surgical procedure included excision of the appendage and closure of the defect. Images PMID:5034603

  16. Routine turning maneuvers of koi carp Cyprinus carpio koi: effects of turning rate on kinematics and hydrodynamics.

    PubMed

    Wu, Guanhao; Yang, Yan; Zeng, Lijiang

    2007-12-01

    Spontaneous swimming behaviors of koi carp Cyprinus carpio koi were recorded using a video tracking system. Routine single-beat turns were selected from the recorded image sequences for kinematic and hydrodynamic analysis. As with C-starts, the turns can be divided into two stages (stage 1 and stage 2), based on kinematics. Stage 1 involves a bend to one side forming a C-shaped curve in the body, while stage 2 corresponds to the return flip of the body and tail. The turning angle in stage 1 accounts for the greatest portion of the total turning angle and the mean turning rate in stage 1 reflects the intensity of turn. The effects of the turning rate in stage 1 on both kinematics and hydrodynamics were examined. The duration of stage 1 remained relatively stable over a nearly tenfold change in turning rate. Consequently, the turning angle is dominated by the turning rate in stage 1. The turning radius is not related to the swimming speed. Moreover, except in very fast turns, the turning radius is also not affected by the turning rate. The angle between the side jet and the carp's initial orientation of a turn does not change substantially with the turning rate, and it is always close to 90 degrees (94.2+/-3.1 degrees , N=41), so the orientation of the side jet in the forthcoming turn can be predicted. The angle between the jet and the line joining the center of mass of the carp and the trailing edge of the tail (mean value in stage 1) is also always close to 90 degrees (95.3+/-1.3 degrees , N=41). It is helpful for the carp to maximize the torque so as to improve the turning efficiency. In stage 1, the impulsive moment obtained from the beat of the body and tail and the mean angular momentum of the carp show an agreement in magnitude. Two types of flow patterns in the wake of routine single-beat turns are revealed. The difference between the two types of wakes is in whether or not a vortex ring and a thrust jet are generated in stage 2. The recoil speed of the tail

  17. TMS over the Left Angular Gyrus Impairs the Ability to Discriminate Left from Right

    ERIC Educational Resources Information Center

    Hirnstein, Marco; Bayer, Ulrike; Ellison, Amanda; Hausmann, Markus

    2011-01-01

    The underlying cognitive and neural mechanisms of the ability to discriminate left from right are hardly explored. Clinical studies from patients with impairments of left-right discrimination (LRD) and neuroimaging data suggest that the left angular gyrus is particularly involved in LRD. Moreover, it is argued that the often reported sex…

  18. Corner height influences center of mass kinematics and path trajectory during turning.

    PubMed

    Fino, Peter C; Lockhart, Thurmon E; Fino, Nora F

    2015-01-01

    Despite the prevalence of directional changes during every-day gait, relatively little is known about turning compared to straight gait. While the center of mass (COM) movement during straight gait is well characterized, the COM trajectory and the factors that influence it are less established for turning. This study investigated the influence of a corner׳s height on the COM trajectory as participants walked around the corner. Ten participants (25.3±3.74 years) performed both 90° step and spin turns to the left at self-selected slow, normal, and fast speeds while walking inside a marked path. A pylon was placed on the inside corner of the path. Four different pylon heights were used to correspond to heights of everyday objects: 0 cm (no object), 63 cm (box, crate), 104 cm (desk, table, counter), 167 cm (shelf, cabinet). Obstacle height was found to significantly affect the COM trajectory. Taller obstacles resulted in more distance between the corner and the COM, and between the corner and the COP. Taller obstacles also were associated with greater curvature in the COM trajectory, indicating a smaller turning radius despite the constant 90° corner. Taller obstacles correlated to an increased required coefficient of friction (RCOF) due to the smaller turning radii. Taller obstacles also tended towards greater mediolateral (ML) COM-COP angles, contrary to the initial hypothesis. Additionally, the COM was found to remain outside the base of support (BOS) for the entire first half of stance phase for all conditions indicating a high risk of falls resulting from slips.

  19. Plasticity of the RNA Kink Turn Structural Motif

    SciTech Connect

    Antonioli, A.; Cochrane, J; Lipchock, S; Strobel, S

    2010-01-01

    The kink turn (K-turn) is an RNA structural motif found in many biologically significant RNAs. While most examples of the K-turn have a similar fold, the crystal structure of the Azoarcus group I intron revealed a novel RNA conformation, a reverse kink turn bent in the direction opposite that of a consensus K-turn. The reverse K-turn is bent toward the major grooves rather than the minor grooves of the flanking helices, yet the sequence differs from the K-turn consensus by only a single nucleotide. Here we demonstrate that the reverse bend direction is not solely defined by internal sequence elements, but is instead affected by structural elements external to the K-turn. It bends toward the major groove under the direction of a tetraloop-tetraloop receptor. The ability of one sequence to form two distinct structures demonstrates the inherent plasticity of the K-turn sequence. Such plasticity suggests that the K-turn is not a primary element in RNA folding, but instead is shaped by other structural elements within the RNA or ribonucleoprotein assembly.

  20. Repair of right aortic arch with aberrant left subclavian artery and left ligamentum arteriosum.

    PubMed

    Chen, C L

    1990-07-01

    A case of right aortic arch with an aberrant left subclavian artery arising from a Kommerell's diverticulum of the descending thoracic aorta with a left ligamentum arteriosum completing a vascular ring about the trachea and esophagus is presented. A posterolateral left thoracotomy alone is sufficient to provide an excellent exposure for the division of the ligamentum arteriosum and the resection of the Kommerell's diverticulum. Furthermore, the development of a subclavian steal syndrome is prevented by the reimplantation of the divided left subclavian artery into the left common carotid artery through this same incision.

  1. Effects of Right-Turn Vehicles on Traffic Flow

    NASA Astrophysics Data System (ADS)

    Shang, Hua-Yan; Huang, Hai-Jun; Wu, Wen-Xiang

    In real traffic, the right-turn vehicles at intersections are not controlled by signal lights and their effects are neglected. In this paper, we develop a cellular automaton model to formulate the complicated turning behaviors of vehicles at intersections. Simulation results are quite in accord with the observation on the Beijing's 4th ring road. It is found that the right-turn vehicles may produce queue near the intersection, a short lane designed for right-turn has prominent effect in improving traffic flow, but, a too long lane for right-turn cannot further decrease the stop ratio as expected. These findings deepen our understanding on the effects of right-turn vehicles and may help the design and management of intersections.

  2. [Effect of ski tapering on turning radius and stress].

    PubMed

    Mössner, M; Nachbauer, W; Schindelwig, K

    1997-12-01

    The first part of this paper deals with the influence of the side cut on the turn radius, which was examined by measuring the turn radius of a self-running sledge-like construction and by comparing it to Howe's prediction. The turn radius at the beginning of the turn has proved to be between 65 and 85% of the theoretically expected result. In the second part a carvers turn radius was determined and the reaction force acting on the skier was calculated. The result shows a strong reduction of the turn radius along the path which increases the load on the skier. The effect of side cut and velocity on the load was examined. Using carver skis even small changes in velocity resulted in considerable load changes.

  3. What Lies Ahead (left-eye)

    NASA Technical Reports Server (NTRS)

    2004-01-01

    This is the left-eye version of the 3-D cylindrical-perspective mosaic showing the view south of the martian crater dubbed 'Bonneville.' The image was taken by the navigation camera on the Mars Exploration Rover Spirit. The rover will travel toward the Columbia Hills, seen here at the upper left. The rock dubbed 'Mazatzal' and the hole the rover drilled in to it can be seen at the lower left. The rover's position is referred to as 'Site 22, Position 32.' This image was geometrically corrected to make the horizon appear flat.

  4. Anomalous Feeding of the Left Upper Lobe.

    PubMed

    Hazzard, Christopher; Itagaki, Shinobu; Lajam, Fouad; Flores, Raja M

    2016-09-01

    We report the case of a 53-year-old woman who presented with massive hemoptysis. Computed tomographic angiography revealed an anomalous vessel arising from the abdominal aorta, coursing anteriorly and through the diaphragm, and feeding the left upper lobe. At operation the vessel was found to anastomose to the left upper lobe lingula, which contained multiple vascular abnormalities and arteriovenous fistulas. The vessel was ligated, and the affected portion of the left upper lobe was resected. Anomalous systemic arterial supply of an upper lobe is an especially rare form of a Pryce type 1 abnormality. Recognition of these unusual anatomic variants is crucial to successful treatment and avoidance of adverse events.

  5. Do Right- and Left-Handed Monkeys Differ on Cognitive Measures?

    NASA Technical Reports Server (NTRS)

    Hopkins, William D.; Washburn, David A.

    1994-01-01

    Twelve left- and 14 right-handed monkeys were compared on 6 measures of cognitive performance (2 maze-solving tasks, matching-to-sample, delayed matching-to-sample, delayed response using spatial cues, and delayed response using form cues). The dependent variable was trials-to-training criterion for each of the 6 tasks. Significant differences were found between left- and right-handed monkeys on the 2 versions of the delayed response task. Right-handed monkeys reached criterion significantly faster on the form cue version of the task, whereas left-handed monkeys reached criterion significantly faster on delayed response for spatial position (p less than .05). The results suggest that sensitive hand preference measures of laterality can reveal differences in cognitive performance, which in turn may reflect underlying laterality in functional organization of the nervous system.

  6. Anticipation in turn-taking: mechanisms and information sources

    PubMed Central

    Riest, Carina; Jorschick, Annett B.; de Ruiter, Jan P.

    2015-01-01

    During conversations participants alternate smoothly between speaker and hearer roles with only brief pauses and overlaps. There are two competing types of accounts about how conversationalists accomplish this: (a) the signaling approach and (b) the anticipatory (‘projection’) approach. We wanted to investigate, first, the relative merits of these two accounts, and second, the relative contribution of semantic and syntactic information to the timing of next turn initiation. We performed three button-press experiments using turn fragments taken from natural conversations to address the following questions: (a) Is turn-taking predominantly based on anticipation or on reaction, and (b) what is the relative contribution of semantic and syntactic information to accurate turn-taking. In our first experiment we gradually manipulated the information available for anticipation of the turn end (providing information about the turn end in advance to completely removing linguistic information). The results of our first experiment show that the distribution of the participants’ estimation of turn-endings for natural turns is very similar to the distribution for pure anticipation. We conclude that listeners are indeed able to anticipate a turn-end and that this strategy is predominantly used in turn-taking. In Experiment 2 we collected purely reacted responses. We used the distributions from Experiments 1 and 2 together to estimate a new dependent variable called Reaction Anticipation Proportion. We used this variable in our third experiment where we manipulated the presence vs. absence of semantic and syntactic information by low-pass filtering open-class and closed class words in the turn. The results suggest that for turn-end anticipation, both semantic and syntactic information are needed, but that the semantic information is a more important anticipation cue than syntactic information. PMID:25699004

  7. Idiopathic left ventricular hypertrophy in an infant.

    PubMed

    Bhardwaj, Rajeev; Bhardwaj, Praveen

    2011-01-01

    Cardiac hypertrophy in infancy has been a subject of considerable interest. We present a case of significant left ventricular hypertrophy without any associated cause, presenting in infancy. PMID:23550435

  8. Left atrial myxoma masquerading as viral flu

    PubMed Central

    Chhabra, Lovely; Kiernan, Francis

    2016-01-01

    Atrial myxoma is a rare cardiac tumor that may be diagnosed incidentally on cardiac imaging or may present with life-threatening cardiac symptoms. We present a case of giant left atrial myxoma that presented as a flulike illness.

  9. Differences in Left and Right Laparoscopic Adrenalectomy

    PubMed Central

    Rieder, Jocelyn M.; Nisbet, Alan A.; Wuerstle, Melanie C.; Tran, Viet Q.; Kwon, Eric O.

    2010-01-01

    Background and Objectives: The classic belief is that right-sided laparoscopic adrenalectomy is technically more difficult to perform than left-sided. The purpose of this study was to determine whether objective outcomes are different for the right- versus left- sided operation. Methods: A retrospective review of 163 laparoscopic adrenalectomies was performed to compare outcomes. Variables extracted included age, demographics, body mass index (BMI), laterality, indication, operative time, estimated blood loss (EBL), gland size, complications, open conversion rates, and length of stay. Results: Of the adrenalectomies performed, 109 were on the left and 54 on the right. Age, BMI, and indication were similar for each group. The mean EBL on the left side was 113mL (range, 2 to 3000) and 84mL (range, 10 to 700) for the right (P=0.85). The mean operative time on the left side was 187 minutes (range, 62 to 475) and on the right was 156 minutes (range, 50 to 365) (P=0.02). There was no difference in complication or conversion rate. Conclusions: There was no difference in complication or conversion rates between each side, and we observed a trend toward lower blood loss for the right side. Although we report generally similar outcomes, the mean operative time for a right-sided laparoscopic adrenalectomy was significantly less (31 minutes) than the left side. PMID:21333190

  10. Case Study Using Ultrasound to Treat /[turned r]/

    ERIC Educational Resources Information Center

    Modha, Geetanjalee; Bernhardt, B. May; Church, Robyn; Bacsfalvi, Penelope

    2008-01-01

    Background: Ultrasound has shown promise as visual feedback in remediation of /[turned r]/.Aims: To compare treatment for [turned r] with and without ultrasound.Methods & Procedures: A Canadian English-speaking adolescent participated in a case study with a no treatment baseline, alternating treatment blocks with and without ultrasound and a final…

  11. Turning Points in the Development of Classical Musicians

    ERIC Educational Resources Information Center

    Gabor, Elena

    2011-01-01

    This qualitative study investigated the vocational socialization turning points in families of classical musicians. I sampled and interviewed 20 parent-child dyads, for a total of 46 interviews. Data analysis revealed that classical musicians' experiences were marked by 11 turning points that affected their identification with the occupation:…

  12. Compensatory mechanisms of transtibial amputees during circular turning.

    PubMed

    Ventura, Jessica D; Segal, Ava D; Klute, Glenn K; Neptune, Richard R

    2011-07-01

    Turning plays a prominent role in daily living activities and requires the modulation of the ground reaction forces to accelerate the body's center-of-mass along the path of the turn. With the ankle plantarflexors being prominent contributors to the propulsive ground reaction forces, it is not clear how transtibial amputees perform turning tasks without these important muscles. The purpose of this study was to identify the compensatory mechanisms used by transtibial amputees during a simple turning task by analyzing the radial and anterior-posterior ground reaction impulses and sagittal, transverse and coronal joint work of the residual and intact legs. These quantities were analyzed with the residual leg on both the inside and outside of the turn and compared to non-amputees. The analysis showed that amputees and non-amputees use different joint strategies to turn. Amputees rely primarily on sagittal plane hip joint work to turn while non-amputees rely primarily on ankle work in the sagittal plane and hip joint work in the coronal plane. Differences in strategies are most likely due to the minimal power output provided by the passive prosthetic feet used by amputees and perhaps a desire to minimize the risk of falling. Understanding these differences in turning strategies will aid in developing effective rehabilitation therapies and prosthetic devices that improve amputee mobility.

  13. Turn and Control in Puerto Rican Spanish Conversation.

    ERIC Educational Resources Information Center

    Kilpatrick, Paul

    An investigation of Puerto Rican Spanish conversational strategies involved analysis of recorded conversations for the amount of simultaneous speech, its context, and the turn-taking used. Overlapping and interruption were distinguished from cooperative (supportive) simultaneity of speech, and a "turn" was defined as a recognized utterance. The…

  14. Turn-Continuation by Self and by Other

    ERIC Educational Resources Information Center

    Sidnell, Jack

    2012-01-01

    At the possible completion of a turn constructional unit (TCU) that has not selected a next speaker, a speaker has two available options: either begin a new TCU or continue the one that has just come to a point of possible completion. This article describes some of the complex turns that result from exercising the second option. These can be seen…

  15. High explosive corner turning performance and the LANL mushroom test

    SciTech Connect

    Hill, L.G.; Seitz, W.L.; Forest, C.A.; Harry, H.H.

    1998-07-01

    The Mushroom test is designed to characterize the corner turning performance of a new generation of less sensitive booster explosives. The test is described in detail, and three corner turning figures-of-merit are examined using pure TATB (both Livermore{close_quote}s Ultrafine and a Los Alamos research blend) and PBX9504 as examples. {copyright} {ital 1998 American Institute of Physics.}

  16. High explosive corner turning performance and the LANL Mushroom test

    SciTech Connect

    Hill, L.G.; Seitz, W.L.; Forest, C.A.; Harry, H.H.

    1997-09-01

    The Mushroom test is designed to characterize the corner turning performance of a new generation of less insensitive booster explosives. The test is described in detail, and three corner turning figures-of-merit are examined using pure TATB (both Livermore`s Ultrafine and a Los Alamos research blend) and PBX9504 as examples.

  17. Turning Points: Priorities for Teacher Education in a Democracy

    ERIC Educational Resources Information Center

    Romano, Rosalie M.

    2009-01-01

    Every generation has its moment, some turning point that will mark its place in the historical record. Such points provide the direction of our history and our future. Turning points are, characteristically, times of turmoil based on a fundamental change in models or events--what Thomas Kuhn called a "paradigm shift." In terms of a democratic…

  18. Human Rights Education and the Post Secular Turn

    ERIC Educational Resources Information Center

    Bowie, Bob

    2012-01-01

    This article questions whether human rights education (HRE) scholarship is responding adequately to the post secular turn in thinking about the place and nature of religion in society. Here the post secular turn is used to describe the discrediting of secularisation theory, the recognition of religion as an enduring and pervasive global cultural…

  19. Turn nucleation perturbs amyloid β self-assembly and cytotoxicity.

    PubMed

    Doran, Todd M; Anderson, Elizabeth A; Latchney, Sarah E; Opanashuk, Lisa A; Nilsson, Bradley L

    2012-08-10

    The accumulation of senile plaques composed of amyloid β (Aβ) fibrils is a hallmark of Alzheimer's disease, although prefibrillar oligomeric species are believed to be the primary neurotoxic congeners in the pathogenesis of Alzheimer's disease. Uncertainty regarding the mechanistic relationship between Aβ oligomer and fibril formation and the cytotoxicity of these aggregate species persists. β-Turn formation has been proposed to be a potential rate-limiting step during Aβ fibrillogenesis. The effect of turn nucleation on Aβ self-assembly was probed by systematically replacing amino acid pairs in the putative turn region of Aβ (residues 24-27) with d-ProGly ((D)PG), an effective turn-nucleating motif. The kinetic, thermodynamic, and cytotoxic effects of these mutations were characterized. It was found that turn formation dramatically accelerated Aβ fibril self-assembly dependent on the site of turn nucleation. The cytotoxicity of the three (D)PG-containing Aβ variants was significantly lower than that of wild-type Aβ40, presumably due to decreased oligomer populations as a function of a more rapid progression to mature fibrils; oligomer populations were not eliminated, however, suggesting that turn formation is also a feature of oligomer structures. These results indicate that turn nucleation is a critical step in Aβ40 fibril formation.

  20. Revealing turning points in ecosystem functioning over the Northern Eurasian agricultural frontier.

    PubMed

    Horion, Stéphanie; Prishchepov, Alexander V; Verbesselt, Jan; de Beurs, Kirsten; Tagesson, Torbern; Fensholt, Rasmus

    2016-08-01

    The collapse of the Soviet Union in 1991 has been a turning point in the World history that left a unique footprint on the Northern Eurasian ecosystems. Conducting large scale mapping of environmental change and separating between naturogenic and anthropogenic drivers is a difficult endeavor in such highly complex systems. In this research a piece-wise linear regression method was used for breakpoint detection in Rain-Use Efficiency (RUE) time series and a classification of ecosystem response types was produced. Supported by earth observation data, field data, and expert knowledge, this study provides empirical evidence regarding the occurrence of drastic changes in RUE (assessment of the timing, the direction and the significance of these changes) in Northern Eurasian ecosystems between 1982 and 2011. About 36% of the study area (3.4 million km(2) ) showed significant (P < 0.05) trends and/or turning points in RUE during the observation period. A large proportion of detected turning points in RUE occurred around the fall of the Soviet Union in 1991 and in the following years which were attributed to widespread agricultural land abandonment. Our study also showed that recurrent droughts deeply affected vegetation productivity throughout the observation period, with a general worsening of the drought conditions in recent years. Moreover, recent human-induced turning points in ecosystem functioning were detected and attributed to ongoing recultivation and change in irrigation practices in the Volgograd region, and to increased salinization and increased grazing intensity around Lake Balkhash. The ecosystem-state assessment method introduced here proved to be a valuable support that highlighted hotspots of potentially altered ecosystems and allowed for disentangling human from climatic disturbances.

  1. Revealing turning points in ecosystem functioning over the Northern Eurasian agricultural frontier.

    PubMed

    Horion, Stéphanie; Prishchepov, Alexander V; Verbesselt, Jan; de Beurs, Kirsten; Tagesson, Torbern; Fensholt, Rasmus

    2016-08-01

    The collapse of the Soviet Union in 1991 has been a turning point in the World history that left a unique footprint on the Northern Eurasian ecosystems. Conducting large scale mapping of environmental change and separating between naturogenic and anthropogenic drivers is a difficult endeavor in such highly complex systems. In this research a piece-wise linear regression method was used for breakpoint detection in Rain-Use Efficiency (RUE) time series and a classification of ecosystem response types was produced. Supported by earth observation data, field data, and expert knowledge, this study provides empirical evidence regarding the occurrence of drastic changes in RUE (assessment of the timing, the direction and the significance of these changes) in Northern Eurasian ecosystems between 1982 and 2011. About 36% of the study area (3.4 million km(2) ) showed significant (P < 0.05) trends and/or turning points in RUE during the observation period. A large proportion of detected turning points in RUE occurred around the fall of the Soviet Union in 1991 and in the following years which were attributed to widespread agricultural land abandonment. Our study also showed that recurrent droughts deeply affected vegetation productivity throughout the observation period, with a general worsening of the drought conditions in recent years. Moreover, recent human-induced turning points in ecosystem functioning were detected and attributed to ongoing recultivation and change in irrigation practices in the Volgograd region, and to increased salinization and increased grazing intensity around Lake Balkhash. The ecosystem-state assessment method introduced here proved to be a valuable support that highlighted hotspots of potentially altered ecosystems and allowed for disentangling human from climatic disturbances. PMID:26929395

  2. Retroaortic left renal vein in a case of left adrenal adenoma: radiological findings.

    PubMed

    Dilli, Alper; Ayaz, Umit Yasar; Karabacak, Osman Raif; Hekimoglu, Baki

    2011-01-01

    It is important to diagnose retroaortic left renal vein (RLRV) before a probable retroperitoneal surgery in a case of a suspicious adrenal mass. Our purpose is to present the ultrasonography (US), computed tomography (CT), and magnetic resonance imaging (MRI) findings in a case of left adrenal adenoma with a coincidental RLRV and to discuss the clinical importance of their imaging. Abdominal and scrotal US, abdominal CT and MRI were performed for a 50-year-old male patient who was referred with continuous abdominal pain, intractable hypertension, high levels of blood cortisol and proteinuria. On US, a hypoechoic solid mass measuring 4 × 3 cm in the left adrenal location and coincidental RLRV, besides multiple renal cysts, hepatomegaly, left-sided varicocele, and small-sized left testis were detected. CT and MRI also revealed the mass in the left adrenal gland which was consistent with adenoma. With CT and MRI, presence of RLRV was also verified.

  3. Experience sharing, emotional reciprocity, and turn-taking

    PubMed Central

    Stevanovic, Melisa; Peräkylä, Anssi

    2015-01-01

    In this perspective article, we consider the relationship between experience sharing and turn-taking. There is much evidence suggesting that human social interaction is permeated by two temporal organizations: (1) the sequential framework of turn-taking and (2) the concurrent framework of emotional reciprocity. From this perspective, we introduce two alternative hypotheses about how the relationship between experience sharing and turn-taking could be viewed. According to the first hypothesis, the home environment of experience sharing is in the concurrent framework of emotional reciprocity, while the motivation to share experiences is in tension with the sequential framework of turn-taking. According to the second hypothesis, people’s inclination to coordinate their actions in terms of turn-taking is motivated precisely by their propensity to share experiences. We consider theoretical and empirical ideas in favor of both of these hypotheses and discuss their implications for future research. PMID:25926811

  4. Human non-visual discrimination of gradual turning is poor.

    PubMed

    Cornell, Edward H; Bourassa, Charles M

    2007-05-01

    We report three measures of the ability of normally sighted adults to discriminate turning while walking blindfolded outdoors. Constant error in selecting line drawings of paths indicated that participants under represent the amount of turning along more curved paths and over represent the amount of turning on less curved paths. Constant error in the direction of pointing to the origin of paths indicated a bias consistent with the direction of turning along more curved paths. Participants produced more accurate drawings of paths as the amount of turning increased. The results suggest that non-visual cues that accompany self movement are not sufficient for accurate representation of large radius curves in geographic scale travel.

  5. Turn costs change the value of animal search paths.

    PubMed

    Wilson, R P; Griffiths, I W; Legg, P A; Friswell, M I; Bidder, O R; Halsey, L G; Lambertucci, S A; Shepard, E L C

    2013-09-01

    The tortuosity of the track taken by an animal searching for food profoundly affects search efficiency, which should be optimised to maximise net energy gain. Models examining this generally describe movement as a series of straight steps interspaced by turns, and implicitly assume no turn costs. We used both empirical- and modelling-based approaches to show that the energetic costs for turns in both terrestrial and aerial locomotion are substantial, which calls into question the value of conventional movement models such as correlated random walk or Lévy walk for assessing optimum path types. We show how, because straight-line travel is energetically most efficient, search strategies should favour constrained turn angles, with uninformed foragers continuing in straight lines unless the potential benefits of turning offset the cost.

  6. Turn-by-Turn and Bunch-by-Bunch Transverse Profiles of a Single Bunch in a Full Ring

    SciTech Connect

    Kraus, R.; Fisher, A.S.; /SLAC

    2005-12-15

    The apparatus described in this paper can image the evolution of the transverse profile of a single bunch, isolated from a full PEP-II ring of 1500 bunches. Using this apparatus there are two methods of single bunch imaging; bunch-by-bunch beam profiling can image every bunch in the ring a single bunch at a time with the images of sequential bunches being in order, allowing one to see variations in beam size along a train. Turn-by-turn beam profiling images a single bunch on each successive turn it makes around the ring. This method will be useful in determining the effect that an injected bunch has on a stable bunch as the oscillations of the injected bunch damp out. Turn-by-turn imaging of the synchrotron light uses a system of lenses and mirrors to image many turns of both the major and minor axis of a single bunch across the photocathode of a gateable camera. The bunch-by-bunch method is simpler: because of a focusing mirror used in porting the light from the ring, the synchrotron light from the orbiting electrons becomes an image at a certain distance from the mirror; and since the camera does not use a lens, the photocathode is set exactly at this image distance. Bunch-by-bunch profiling has shown that in the Low Energy Ring (LER) horizontal bunch size decreases along a train. Turn-by-turn profiling has been able to image 100 turns of a single bunch on one exposure of the camera. The turn-by-turn setup has also been able to image 50 turns of the minor axis showing part of the damping process of an oscillating injected charge during a LER fill. The goal is to image the damping of oscillations of injected charge for 100 turns of both the major and minor axis throughout the damping process during trickle injection. With some changes to the apparatus this goal is within reach and will make turn-by-turn imaging a very useful tool in beam diagnostics.

  7. Correction of anomalous origin of left coronary artery using left subclavian artery.

    PubMed Central

    Monro, J L; Sharratt, G P; Conway, N

    1978-01-01

    A case of anomalous origin of the left coronary artery from the pulmonary artery is reported in which surgical correction by anastomosis of the left subclavian artery to the left coronary artery was performed at the age of 6 months. There was a dramatic clinical improvement, and at 22 months repeat angiocardiography disclosed a patent graft and remarkable improvement in left ventricular function. It is recommended that this is the operation of choice for infants in whom cardiac catheterisation fails to show a shunt into the pulmonary artery or the shunt is small. Images PMID:626667

  8. BolA Is a Transcriptional Switch That Turns Off Motility and Turns On Biofilm Development

    PubMed Central

    Dressaire, Clémentine; Moreira, Ricardo Neves; Barahona, Susana; Alves de Matos, António Pedro

    2015-01-01

    ABSTRACT Bacteria are extremely versatile organisms that rapidly adapt to changing environments. When bacterial cells switch from planktonic growth to biofilm, flagellum formation is turned off and the production of fimbriae and extracellular polysaccharides is switched on. BolA is present in most Gram-negative bacteria, and homologues can be found from proteobacteria to eukaryotes. Here, we show that BolA is a new bacterial transcription factor that modulates the switch from a planktonic to a sessile lifestyle. It negatively modulates flagellar biosynthesis and swimming capacity in Escherichia coli. Furthermore, BolA overexpression favors biofilm formation, involving the production of fimbria-like adhesins and curli. Our results also demonstrate that BolA is a protein with high affinity to DNA and is able to regulate many genes on a genome-wide scale. Moreover, we show that the most significant targets of this protein involve a complex network of genes encoding proteins related to biofilm development. Herein, we propose that BolA is a motile/adhesive transcriptional switch, specifically involved in the transition between the planktonic and the attachment stage of biofilm formation. PMID:25691594

  9. How many hydrogen-bonded α-turns are possible?

    PubMed

    Schreiber, Anette; Schramm, Peter; Hofmann, Hans-Jörg

    2011-06-01

    The formation of α-turns is a possibility to reverse the direction of peptide sequences via five amino acids. In this paper, a systematic conformational analysis was performed to find the possible isolated α-turns with a hydrogen bond between the first and fifth amino acid employing the methods of ab initio MO theory in vacuum (HF/6-31G*, B3LYP/6-311 + G*) and in solution (CPCM/HF/6-31G*). Only few α-turn structures with glycine and alanine backbones fulfill the geometry criteria for the i←(i + 4) hydrogen bond satisfactorily. The most stable representatives agree with structures found in the Protein Data Bank. There is a general tendency to form additional hydrogen bonds for smaller pseudocycles corresponding to β- and γ-turns with better hydrogen bond geometries. Sometimes, this competition weakens or even destroys the i←(i + 4) hydrogen bond leading to very stable double β-turn structures. This is also the reason why an "ideal" α-turn with three central amino acids having the perfect backbone angle values of an α-helix could not be localized. There are numerous hints for stable α-turns with a distance between the C(α)-atoms of the first and fifth amino acid smaller than 6-7 Å, but without an i←(i + 4) hydrogen bond. PMID:20842396

  10. LX-17 Corner-Turning and Reactive Flow Failure

    SciTech Connect

    Souers, P C; Andreski, H; Cook III, C F; Garza, R; Pastrone, R; Phillips, D; Roeske, F; Vitello, P; Molitoris, J

    2004-03-11

    We have performed a series of highly-instrumented experiments examining corner-turning of detonation. A TATB booster is inset 15 mm into LX-17 (92.5% TATB, 7.5% kel-F) so that the detonation must turn a right angle around an air well. An optical pin located at the edge of the TATB gives the start time of the corner-turn. The breakout time on the side and back edges is measured with streak cameras. Three high-resolution X-ray images were taken on each experiment to examine the details of the detonation. We have concluded that the detonation cannot turn the corner and subsequently fails, but the shock wave continues to propagate in the unreacted explosive, leaving behind a dead zone. The detonation front farther out from the corner slowly turns and eventually reaches the air well edge 180{sup o} from its original direction. The dead zone is stable and persists 7.7 {micro}s after the corner-turn, although it has drifted into the original air well area. Our regular reactive flow computer models sometimes show temporary failure but they recover quickly and are unable to model the dead zones. We present a failure model that cuts off the reaction rate below certain detonation velocities and reproduces the qualitative features of the corner-turning failure.

  11. U-turn alternative to the large aperture switch

    SciTech Connect

    Vann, C.S.

    1994-03-09

    The primary alternative laser architecture is the U-turn design. The U-turn has significantly different cost and performance risks than the full-aperture switch, which makes it a highly desirable alternative. The U-turn was conceived at LLNL in 1992. A similar concept, the L-turn had already been discovered by the French at CEL-V. Both concepts are based on the multipass glass amplifier design, but the full-aperture Pockels cell and polarizer are replaced with smaller and less expensive optics. Eliminating the large switch and polarizer not only reduces component costs, it also provides options for shortening the laser which, in turn, could reduce the size and cost of the laser building. Efficient use of the amplifier aperture (small vignetting allowance) requires that the U-turn have a long transport spatial filter; however, this is not a disadvantage if a long spatial filter is already required for image relaying to the frequency converter. Given a long spatial filter, the U-turn is potentially more efficient because losses in the switch and polarizer are avoided.

  12. Exceptional running and turning performance in a mite.

    PubMed

    Rubin, Samuel; Young, Maria Ho-Yan; Wright, Jonathan C; Whitaker, Dwight L; Ahn, Anna N

    2016-03-01

    The Southern California endemic mite Paratarsotomus macropalpis was filmed in the field on a concrete substrate and in the lab to analyze stride frequency, gait and running speed under different temperature conditions and during turning. At ground temperatures ranging from 45 to 60 °C, mites ran at a mean relative speed of 192.4 ± 2.1 body lengths (BL) s(-1), exceeding the highest previously documented value for a land animal by 12.5%. Stride frequencies were also exceptionally high (up to 135 Hz), and increased with substrate temperature. Juveniles exhibited higher relative speeds than adults and possess proportionally longer legs, which allow for greater relative stride lengths. Although mites accelerated and decelerated rapidly during straight running (7.2 ± 1.2 and -10.1 ± 2.1 m s(-2), respectively), the forces involved were comparable to those found in other animals. Paratarsotomus macropalpis employs an alternating tetrapod gait during steady running. Shallow turns were accomplished by a simple asymmetry in stride length. During tight turns, mites pivoted around the tarsus of the inside third leg (L3), which thus behaved like a grappling hook. Pivot turns were characterized by a 42% decrease in turning radius and a 40% increase in angular velocity compared with non-pivot turns. The joint angle amplitudes of the inner L2 and L3 were negligible during a pivot turn. While exceptional, running speeds in P. macropalpis approximate values predicted from inter-specific scaling relationships.

  13. Exceptional running and turning performance in a mite.

    PubMed

    Rubin, Samuel; Young, Maria Ho-Yan; Wright, Jonathan C; Whitaker, Dwight L; Ahn, Anna N

    2016-03-01

    The Southern California endemic mite Paratarsotomus macropalpis was filmed in the field on a concrete substrate and in the lab to analyze stride frequency, gait and running speed under different temperature conditions and during turning. At ground temperatures ranging from 45 to 60 °C, mites ran at a mean relative speed of 192.4 ± 2.1 body lengths (BL) s(-1), exceeding the highest previously documented value for a land animal by 12.5%. Stride frequencies were also exceptionally high (up to 135 Hz), and increased with substrate temperature. Juveniles exhibited higher relative speeds than adults and possess proportionally longer legs, which allow for greater relative stride lengths. Although mites accelerated and decelerated rapidly during straight running (7.2 ± 1.2 and -10.1 ± 2.1 m s(-2), respectively), the forces involved were comparable to those found in other animals. Paratarsotomus macropalpis employs an alternating tetrapod gait during steady running. Shallow turns were accomplished by a simple asymmetry in stride length. During tight turns, mites pivoted around the tarsus of the inside third leg (L3), which thus behaved like a grappling hook. Pivot turns were characterized by a 42% decrease in turning radius and a 40% increase in angular velocity compared with non-pivot turns. The joint angle amplitudes of the inner L2 and L3 were negligible during a pivot turn. While exceptional, running speeds in P. macropalpis approximate values predicted from inter-specific scaling relationships. PMID:26787481

  14. INCREASING PROTEIN STABILITY BY IMPROVING BETA-TURNS

    PubMed Central

    Fu, Hailong; Grimsley, Gerald R.; Razvi, Abbas; Scholtz, J. Martin; Pace, C. Nick

    2009-01-01

    Our goal was to gain a better understanding of how protein stability can be increased by improving β-turns. We studied 22 β-turns in nine proteins with 66 to 370 residues by replacing other residues with proline and glycine and measuring the stability. These two residues are statistically preferred in some β-turn positions. We studied: Cold shock protein B (CspB), Histidine-containing phosphocarrier protein (HPr), Ubiquitin, Ribonucleases Sa2, Sa3, T1, and HI, Tryptophan synthetase α-subunit (TSα), and Maltose binding protein (MBP). Of the fifteen single proline mutations, 11increased stability (Average = 0.8 ± 0.3; Range = 0.3 – 1.5 kcal/mol), and the stabilizing effect of double proline mutants was additive. Based on this and our previous work, we conclude that proteins can generally be stabilized by replacing non-proline residues with proline residues at the i + 1 position of Type I and II β-turns and at the i position in Type II β-turns. Other turn positions can sometimes be used if the φ angle is near −60° for the residue replaced. It is important that the side chain of the residue replaced is less than 50% buried. Identical substitutions in β-turns in related proteins give similar results. Proline substitutions increase stability mainly by decreasing the entropy of the denatured state. In contrast, the large, diverse group of proteins considered here had almost no residues in β-turns that could be replaced by Gly to increase protein stability. Improving β-turns by substituting Pro residues is a generally useful way of increasing protein stability. PMID:19626709

  15. Anomalous Feeding of the Left Upper Lobe.

    PubMed

    Hazzard, Christopher; Itagaki, Shinobu; Lajam, Fouad; Flores, Raja M

    2016-09-01

    We report the case of a 53-year-old woman who presented with massive hemoptysis. Computed tomographic angiography revealed an anomalous vessel arising from the abdominal aorta, coursing anteriorly and through the diaphragm, and feeding the left upper lobe. At operation the vessel was found to anastomose to the left upper lobe lingula, which contained multiple vascular abnormalities and arteriovenous fistulas. The vessel was ligated, and the affected portion of the left upper lobe was resected. Anomalous systemic arterial supply of an upper lobe is an especially rare form of a Pryce type 1 abnormality. Recognition of these unusual anatomic variants is crucial to successful treatment and avoidance of adverse events. PMID:27549539

  16. Left-Wing Extremism: The Current Threat

    SciTech Connect

    Karl A. Seger

    2001-04-30

    Left-wing extremism is ''alive and well'' both in the US and internationally. Although the current domestic terrorist threat within the U. S. is focused on right-wing extremists, left-wing extremists are also active and have several objectives. Leftist extremists also pose an espionage threat to U.S. interests. While the threat to the U.S. government from leftist extremists has decreased in the past decade, it has not disappeared. There are individuals and organizations within the U.S. who maintain the same ideology that resulted in the growth of left-wing terrorism in this country in the 1970s and 1980s. Some of the leaders from that era are still communicating from Cuba with their followers in the U.S., and new leaders and groups are emerging.

  17. Left colectomy with intracoporeal anastomosis: technical aspects

    PubMed Central

    Araujo, Sérgio Eduardo Alonso; Seid, Victor Edmond; Klajner, Sidney; Bertoncini, Alexandre Bruno

    2014-01-01

    Oncologic laparoscopic colectomy represents a fully validated surgical approach to the management of colorectal cancer. However, laparoscopic surgery for distal transverse and descending colon lesions remains a challenging procedure. A total laparoscopic approach to the left colectomy is an interesting option for critically ill patients although reports in the literature on this subject are scarce and its approach still not standardized because of its selective nature for indication. There are several advantages associated with conduction of totally laparoscopic approach to the left colon. Intracorporeal vessel sealing ensures an adequate lymph node dissection. Moreover, it enables the construction of a well-vascularized anastomosis. Ultimately, the occurrence of late wound complications are possibly reduced for the placement of a low abdominal incision exclusively used for specimen extraction. This paper aimed at describing our technique for a totally laparoscopic left colectomy for distal transverse and descending colon lesions. PMID:25295460

  18. Diamond turning of Si and Ge single crystals

    SciTech Connect

    Blake, P.; Scattergood, R.O.

    1988-12-01

    Single-point diamond turning studies have been completed on Si and Ge crystals. A new process model was developed for diamond turning which is based on a critical depth of cut for plastic flow-to-brittle fracture transitions. This concept, when combined with the actual machining geometry for single-point turning, predicts that {open_quotes}ductile{close_quotes} machining is a combined action of plasticity and fracture. Interrupted cutting experiments also provide a meant to directly measure the critical depth parameter for given machining conditions.

  19. Observation of diamond turned OFHC copper using Scanning Tunneling Microscopy

    SciTech Connect

    Grigg, D.A.; Russell, P.E.; Dow, T.A.

    1988-12-01

    Diamond turned OFHC copper samples have been observed within the past few months using the Scanning Tunneling Microscope. Initial results have shown evidence of artifacts which may be used to better understand the diamond turning process. The STM`s high resolution capability and three dimensional data representation allows observation and study of surface features unobtainable with conventional profilometry systems. Also, the STM offers a better quantitative means by which to analyze surface structures than the SEM. This paper discusses findings on several diamond turned OFHC copper samples having different cutting conditions. Each sample has been cross referenced using STM and SEM.

  20. MULTI - MILLION - TURN BEAM POSITION MONITORS FOR RHIC.

    SciTech Connect

    SATOGATA,T.CAMERON,P.CERNIGLIA,P.CUPOLO,J.DAWSON,CDEGEN,CMEAD,JVETTER,K

    2003-05-12

    During the RHIC 2003 run, two beam position monitors (BPMs) in each transverse plane in the RHIC blue ring were upgraded with high-capacity mezzanine cards. This upgrade provided these planes with the capability to digitize up to 128 million consecutive turns of RHIC beam, or almost 30 minutes of continuous beam centroid phase space evolution for a single RHIC bunch. This paper describes necessary hardware and software changes and initial system performance. We discuss early uses and results for diagnosis of coherent beam oscillations, turn-by-turn (TBT) acquisition through a RHIC acceleration ramp, and ac-dipole nonlinear dynamics studies.

  1. STS-92 Mission Specialist Wakata takes his turn driving the M-113

    NASA Technical Reports Server (NTRS)

    2000-01-01

    With Capt. George Hoggard, trainer with the KSC Fire Department, riding on top, Mission Specialist Koichi Wakata of Japan practices driving the M-113, part of emergency egress training during Terminal Countdown Demonstration Test (TCDT) activities. Riding in the back (on the left) are other crew members, waiting their turn to drive. The tracked vehicle could be used by the crew in the event of an emergency at the pad during which the crew must make a quick exit from the area. The TCDT also provides simulated countdown exercises and opportunities to inspect the mission payloads in the orbiter's payload bay. STS-92 is scheduled to launch Oct. 5 at 9:30 p.m. EDT on the fifth flight to the International Space Station. It will carry two elements of the Space Station, the Integrated Truss Structure Z1 and the third Pressurized Mating Adapter. The mission is also the 100th flight in the Shuttle program.

  2. The left parietal cortex and motor attention.

    PubMed

    Rushworth, M F; Nixon, P D; Renowden, S; Wade, D T; Passingham, R E

    1997-09-01

    The posterior parietal cortex, particularly in the right hemisphere, is crucially important for covert orienting; lesions impair the ability to disengage the focus of covert orienting attention from one potential saccade target to another (Posner, M. I. et al., Journal of Neuroscience, 1984, 4, 1863-1874). We have developed a task where precues allow subjects to covertly prepare subsequent cued hand movements, as opposed to an orienting or eye movement. We refer to this process as motor attention to distinguish it from orienting attention. Nine subjects with lesions that included the left parietal cortex and nine subjects with lesions including the right parietal cortex were compared with control subjects on the task. The left hemisphere subjects showed the same ability as controls to engage attention to a movement when they were forewarned by a valid precue. The left hemisphere subjects, however, were impaired in their ability to disengage the focus of motor attention from one movement to another when the precue was incorrect. The results support the existence of two distinct attentional systems allied to the orienting and limb motor systems. Damage to either system causes analogous problems in disengaging from one orienting/movement target to another. The left parietal cortex, particularly the supramarginal gyrus, is associated with motor attention. All the left hemisphere subjects had ideomotor apraxia and had particular problems performing sequences of movements. We suggest that the well documented left hemisphere and apraxic impairment in movement sequencing is the consequence of a difficulty in shifting the focus of motor attention from one movement in a sequence to the next. PMID:9364496

  3. Left Atrial Myxoma Mimicking Mitral Stenosis

    PubMed Central

    Ojji, Dike B; Mamven, Manmak H; Omonua, Odiase; Habib, Zaiyad; Osaze, Hamamatu; Sliwa, Karen

    2012-01-01

    Cardiac myxoma is a benign (non-malignant) neoplasm that represents the most common primary tumour of the heart. We present the case of a 36 year old woman with background hypertension who presented with features of left ventricular failure and seizures, and was found during transthoracic echocardiography to have left atrial myxoma protruding through the mitral valve orifice. She subsequently had excision of the atrial myxoma. The usefulness of early transthoracic echocardiography in any patient presenting with features of heart failure even when the aetiology seems obvious cannot be over-emphasised. PMID:22844201

  4. Coronary Sinus to Left Atrial Communication

    PubMed Central

    Scheller, Vandhana; Mazur, Wojciech; Kong, James; Chung, Eugene S.

    2009-01-01

    Congenital coronary sinus anomalies are rare in clinical practice, partly due to the lack of symptoms. We present a case of coronary sinus anomaly causing a right-to-left intracardiac shunt in a 46 years/old African American female with a past medical history of obstructive sleep apnea, diabetes mellitus, hypertension, coronary artery disease, and ischemic cardiomyopathy who presented with hypoxia. In the months prior to her presentation, she had suffered an inferior myocardial infarction with right ventricular involvement, as well as resulting severe tricuspid regurgitation. In conclusion, further investigations revealed a communication between the coronary sinus (CS) and left atrium (LA). PMID:19730747

  5. Copy-left and Copy-right

    NASA Astrophysics Data System (ADS)

    VanderPlas, Jacob

    2015-01-01

    Any discussion of open licensing almost invariably devolves into a debate between copy-left licenses and permissive licenses, both sides defending their views with a nearly religious fervor. Copy-left licenses, typified by the GPL family of licenses, require all derived products to maintain the open, GPL license. Permissive licenses, typified by the BSD family of licenses, do not impose such requirements. I'll briefly explore the common arguments put forth in favor of either approach, and discuss some concrete examples of where these approaches have helped or hindered the software packages that used them.

  6. Lone, Mobile Left Atrial Hydatid Cyst

    PubMed Central

    Ugurlu, Mehmet; Baktir, Ahmet Oguz; Tekin, Ali Ihsan; Tok, Ahmet; Yagmur, Bayram

    2016-01-01

    Echinococcosis is endemic in various regions of Turkey. Cardiac involvement in echinococcosis is rare, and lone cardiac hydatid cysts are even more unusual. Because cardiac hydatid disease can be fatal, even asymptomatic patients are optimally referred for surgical treatment. We present a rare case of a lone, primary, mobile hydatid cyst in the left atrium of a 62-year-old woman. The cyst caused dyspnea from left ventricular inflow obstruction. In addition to reporting the patient's fatal case, we discuss cardiac hydatid cysts in terms of the scant medical literature. PMID:27303247

  7. Left common basal pyramid torsion following left upper lobectomy/segmentectomy.

    PubMed

    Wang, Wei-Li; Cheng, Yen-Po; Cheng, Ching-Yuan; Wang, Bing-Yen

    2015-05-01

    Lobar or segmental lung torsion is a severe complication of lung resection. To the best of our knowledge, common basal pyramid torsion has never been reported. We describe a case of left basal pyramid torsion after left upper lobectomy and superior segmentectomy, which was successfully treated by thoracoscopic surgery.

  8. Left ventricular assist device implantation via left thoracotomy: alternative to repeat sternotomy.

    PubMed

    Pierson, Richard N; Howser, Renee; Donaldson, Terri; Merrill, Walter H; Dignan, Rebecca J; Drinkwater, Davis C; Christian, Karla G; Butler, Javed; Chomsky, Don; Wilson, John R; Clark, Rick; Davis, Stacy F

    2002-03-01

    Repeat sternotomy for left ventricular assist device insertion may result in injury to the right heart or patent coronary grafts, complicating intraoperative and postoperative management. In 4 critically ill patients, left thoracotomy was used as an alternative to repeat sternotomy. Anastomosis of the outflow conduit to the descending thoracic aorta provided satisfactory hemodynamic support.

  9. Postoperative normalization of left ventricular noncompaction and new echocardiographic signs in aorta to left ventricular tunnel.

    PubMed

    Malakan Rad, Elaheh; Zeinaloo, Ali Akbar

    2013-04-01

    We report postoperative normalization of left ventricular noncompaction in a neonate undergoing successful neonatal surgery for type II aorta to left ventricular tunnel (ALVT) associated with a large patent ductus arteriosus, floppy and extremely redundant anterior mitral leaflet, right coronary artery arising directly from the tunnel, and severe left ventricular noncompaction. We also described 2 novel echocardiographic findings in ALVT including "triple wavy line sign" on M-mode echocardiography which disappeared 1 month after operation and "abnormally increased left ventricular posterior wall motion" on M-mode of standard parasternal long-axis view on color tissue Doppler imaging (TDI) that also normalized postoperatively. We showed that proper definition of endocardial border is extremely important in strain and strain rate imaging in the context of left ventricular noncompaction. Preoperative longitudinal strain and strain rate were significantly decreased in comparison to radial strain and strain rate. Circumferential strain and strain rate were normal. PMID:23346986

  10. View of turbine showing gears which turned the motion of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of turbine showing gears which turned the motion of the vertical turbine shafts to the horizontal for distribution to the mill and increased the speed. - Harmony Manufacturing Company, Mill Number 3, 100 North Mohawk Street, Cohoes, Albany County, NY

  11. When the Stakes Turn Toxic: Learn about Problem Gambling

    MedlinePlus

    ... When the Stakes Turn Toxic Learn About Problem Gambling Anyone who’s bought a lottery ticket or played ... Recognizing Schizophrenia Wise Choices Links Signs of Problem Gambling Are you troubled by gambling? Seek help if: ...

  12. Tropical Storm Gordon Makes a U-Turn

    NASA Video Gallery

    An animation of satellite observations from August 14-17, 2012, shows the birth and strengthening of the Atlantic Ocean's Tropical Storm Gordon making a U-turn and heading back to the east. This vi...

  13. Application considerations for variable volts per turn power transformers

    SciTech Connect

    Ebert, J.A. )

    1994-01-01

    Power transformer tap changing, either under load or when the transformer is de-energized, can be achieved by tapping the winding other than that which is experiencing the voltage change to be compensated. Thus the transformer has a variable volts per turn or variable excitation. The design technique is well known to transformer manufacturers but the author's experience is that it is not widely understood, nor are its advantages appreciated by transformer users. A search for papers revealed a surprising lack of material on this subject. The intent of this tutorial paper is to familiarize transformer users with the principles of designing variable volts per turn transformers and with performance differences from the usual constant volts per turn design, and with the economic advantages of reduced losses and reduced initial cost that is often possible with a variable volts per turn transformer design.

  14. 1. DETAIL BELOW ROASTER, SOUTHEAST VIEW (SHAFT, TURNING GEAR MECHANISM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. DETAIL BELOW ROASTER, SOUTHEAST VIEW (SHAFT, TURNING GEAR MECHANISM AND FURNACE). - Vanadium Corporation of America (VCA) Naturita Mill, Steel Skimmer Salt Roaster, 3 miles Northwest of Naturita, between Highway 141 & San Miguel River, Naturita, Montrose County, CO

  15. Protein prosthesis: β-peptides as reverse-turn surrogates.

    PubMed

    Arnold, Ulrich; Huck, Bayard R; Gellman, Samuel H; Raines, Ronald T

    2013-03-01

    The introduction of non-natural modules could provide unprecedented control over folding/unfolding behavior, conformational stability, and biological function of proteins. Success requires the interrogation of candidate modules in natural contexts. Here, expressed protein ligation is used to replace a reverse turn in bovine pancreatic ribonuclease (RNase A) with a synthetic β-dipeptide: β²-homoalanine-β³-homoalanine. This segment is known to adopt an unnatural reverse-turn conformation that contains a 10-membered ring hydrogen bond, but one with a donor-acceptor pattern opposite to that in the 10-membered rings of natural reverse turns. The RNase A variant has intact enzymatic activity, but unfolds more quickly and has diminished conformational stability relative to native RNase A. These data indicate that hydrogen-bonding pattern merits careful consideration in the selection of beneficial reverse-turn surrogates.

  16. Focus on Marshall: The Marshall Center Turns 50! (Part 2)

    NASA Video Gallery

    This month, the Focus on Marshall team invites you to a very special ceremony -- the NASA verison of a "birthday party" as the Marshall Space Flight Center turns 50 years old. Join them for the unv...

  17. Steady properly-banked turns of turbojet-propelled airplanes

    NASA Technical Reports Server (NTRS)

    Miele, Angelo

    1955-01-01

    The problem of a jet-propelled airplane held in a steady turn is treated both in the very general case and also in the particular case when the polar curve can be approximated by a parabola. Once the general solution has been obtained, some typical maneuvers are next studied such as, the turn of maximum bank, of maximum angular velocity, and of minimum radius of curvature. After a brief comparison is made between the turning characteristics of conventional airplanes and jet airplanes, and after the effect of compressibility upon the turn is examined, the effects of the salient aerodynamic and structural parameters upon the behavior of the plane in curvilinear flight are summarized in the conclusions.

  18. Printed Multi-Turn Loop Antennas for RF Biotelemetry

    NASA Technical Reports Server (NTRS)

    Simons, Rainee N.; Hall, David G.; Miranda, Felix A.

    2007-01-01

    Printed multi-turn loop antennas have been designed for contactless powering of, and reception of radio signals transmitted by, surgically implantable biotelemetric sensor units operating at frequencies in the vicinity of 300 MHz.

  19. Turning water into rock: The inverted waves effect.

    PubMed

    Häkkinen, Jukka; Gröhn, Lauri

    2016-01-01

    Humans perceive shape in two-dimensional shaded images, and turning such an image upside down can result in inversion of the relief of this image. Previous research indicates that this inversion is caused by assumptions related to overhead illumination, global convexity and viewpoint above the surface. In our article, we describe the inverted waves effect, in which turning an image of waves upside down changes its relief and also its perceived material properties.

  20. Turning water into rock: The inverted waves effect

    PubMed Central

    Gröhn, Lauri

    2016-01-01

    Humans perceive shape in two-dimensional shaded images, and turning such an image upside down can result in inversion of the relief of this image. Previous research indicates that this inversion is caused by assumptions related to overhead illumination, global convexity and viewpoint above the surface. In our article, we describe the inverted waves effect, in which turning an image of waves upside down changes its relief and also its perceived material properties. PMID:27482371

  1. The Effect on the Sperry Directional Gyro in Turning

    NASA Technical Reports Server (NTRS)

    RosselliDelTurco, Rossello

    1946-01-01

    The present report is concerned with an analytical treatment of the effects of the transverse inclination of an airplane in a turn on the indication of the directional gyro. It is found that the extreme inclinations which the airplane must necessarily assume for a correct turn in the approaches executed at high speed and small radius of curvature, renders the indications of the instrument worthless during such maneuvers.

  2. Compensations for increased rotational inertia during human cutting turns.

    PubMed

    Qiao, Mu; Brown, Brian; Jindrich, Devin L

    2014-02-01

    Locomotion in a complex environment is often not steady state, but unsteady locomotion (stability and maneuverability) is not well understood. We investigated the strategies used by humans to perform sidestep cutting turns when running. Previous studies have argued that because humans have small yaw rotational moments of inertia relative to body mass, deceleratory forces in the initial velocity direction that occur during the turning step, or 'braking' forces, could function to prevent body over-rotation during turns. We tested this hypothesis by increasing body rotational inertia and testing whether braking forces during stance decreased. We recorded ground reaction force and body kinematics from seven participants performing 45 deg sidestep cutting turns and straight running at five levels of body rotational inertia, with increases up to fourfold. Contrary to our prediction, braking forces remained consistent at different rotational inertias, facilitated by anticipatory changes to body rotational speed. Increasing inertia revealed that the opposing effects of several turning parameters, including rotation due to symmetrical anterior-posterior forces, result in a system that can compensate for fourfold changes in rotational inertia with less than 50% changes to rotational velocity. These results suggest that in submaximal effort turning, legged systems may be robust to changes in morphological parameters, and that compensations can involve relatively minor adjustments between steps to change initial stance conditions.

  3. Position- and quantity-dependent responses in zebrafish turning behavior

    PubMed Central

    Umeda, Keiko; Ishizuka, Toru; Yawo, Hiromu; Shoji, Wataru

    2016-01-01

    Neural reflexes are stereotypical automatic responses often modulated by both intrinsic and environmental factors. We report herein that zebrafish larval C-shaped turning is modulated by the stimulated position of Rohon-Beard (RB) neurons. Targeted stimulation of more anterior RB neurons produces larger trunk flexion, which anticipates adult escape behavior by coordinated turning toward the appropriate direction. We also demonstrated that turning laterality varies with the numbers of stimulated neurons. Multi-cell stimulation of RB neurons elicits contralateral turning, as seen in the touch response to physical contact, while minimum input from single-cell stimulation induces ipsilateral turning, a phenomenon not previously reported. This ipsilateral response, but not the contralateral one, is impaired by transecting the ascending neural tract known as the dorsolateral fascicule (DLF), indicating that two, distinct neural circuits trigger these two responses. Our results suggest that RB neurons transmit the position and quantity of sensory information, which are then processed separately to modulate behavioral strength and to select turning laterality. PMID:27292818

  4. Survey finds Physicists on the Left

    ERIC Educational Resources Information Center

    Physics Today, 1972

    1972-01-01

    A survey study for assessing the attitudes of scientists revealed that most physicists hold relatively liberal views on major issues such as war, drugs, and law and order. Highly successful physicists were found more left-of-center politically than general physicists. (PS)

  5. Pure agraphia after deep left hemisphere haematoma.

    PubMed Central

    Croisile, B; Laurent, B; Michel, D; Trillet, M

    1990-01-01

    Pure agraphia is reported following haematoma in the left centrum semiovale sparing both parietal and frontal cortices. There was total inability to produce graphemes in the absence of limb apraxia. The lesion is assumed to have prevented linguistic and graphemic systems from gaining access to the frontal motor programme. Images PMID:2324759

  6. Numerical Modeling of Left-Handed Metamaterials

    SciTech Connect

    Burke, G J; Champagne, N J; Sharpe, R M

    2001-11-06

    The EIGER method of moments program with periodic Green's function was used to model a periodic array of strips and split-ring resonators. Left-handed propagation due to negative index of refraction is demonstrated in a frequency band. The effective material parameters versus frequency are extracted from the EIGER solution.

  7. Are left-handers really more anxious?

    PubMed

    Wright, Lynn; Hardie, Scott M

    2012-01-01

    Research examining anxiety and handedness is inconclusive. Davidson and Schaffer (1983) found left-handers had higher trait anxiety, while Beaton and Moseley (1991) found no state or trait differences. Such studies potentially have methodological issues, and we have argued that handedness related reactivity differences (Wright & Hardie, 2011) suggest that state anxiety needs to be measured within a context. Thus the current study investigated state and trait anxiety levels in an experimental situation. We found left-handers had significantly higher state scores, supporting the right hemisphere's role in negative affect and inhibition. It also fits with predictions based on the behavioural inhibition system's role in the revised reinforcement sensitivity theory (rRST). No trait differences were found, but there was a significant relationship between trait and state anxiety. Using ANCOVA to control for the influence of trait anxiety on state anxiety, we still found a handedness effect. When participant's trait anxiety levels were similar, left-handers showed a relatively larger state response. We conclude that in the context of an experiment, state anxiety was directly correlated with trait anxiety but that the relatively higher reactivity of left-handers may be a major influence on how they respond in a new situation.

  8. Left atrial myxoma masquerading as viral flu

    PubMed Central

    Chhabra, Lovely; Kiernan, Francis

    2016-01-01

    Atrial myxoma is a rare cardiac tumor that may be diagnosed incidentally on cardiac imaging or may present with life-threatening cardiac symptoms. We present a case of giant left atrial myxoma that presented as a flulike illness. PMID:27695187

  9. Pathological Left-Handedness: An Explanatory Model.

    ERIC Educational Resources Information Center

    Satz, Paul

    Reported was an explanatory conceptual model for pathological left-handedness (PLH) and related hypotheses, some of which could not be tested empirically due to lack of information. The model was reported to provide an explanation for the relationship between handedness and specific learning disability, and handedness and cerebral dominance for…

  10. Left-right symmetry at LHC

    SciTech Connect

    Maiezza, Alessio; Nemevsek, Miha; Nesti, Fabrizio; Senjanovic, Goran

    2010-09-01

    We revisit the issue of the limit on the scale of left-right symmetry breaking. We focus on the minimal SU(2){sub L}xSU(2){sub R}xU(1){sub B-L} gauge theory with the seesaw mechanism and discuss the two possibilities of defining left-right symmetry as parity or charge conjugation. In the commonly adopted case of parity, we perform a complete numerical study of the quark mass matrices and the associated left and right mixing matrices without any assumptions usually made in the literature about the ratio of vacuum expectation values. We find that the usual lower limit on the mass of the right-handed gauge boson from the K mass difference, M{sub W{sub R}}>2.5 TeV, is subject to a possible small reduction due to the difference between right and left Cabibbo angles. In the case of charge conjugation the limit on M{sub W{sub R}} is somewhat more robust. However, the more severe bounds from CP-violating observables are absent in this case. In fact, the free phases can also resolve the present mild discrepancy between the standard model and CP violation in the B sector. Thus, even in the minimal case, both charged and neutral gauge bosons may be accessible at the Large Hadron Collider with spectacular signatures of lepton number violation.

  11. Diaphragmatic hernia simulating a left pleural effusion.

    PubMed

    Wooldridge, Jamie L; Partrick, David A; Bensard, Denis D; Deterding, Robin R

    2003-12-01

    We review a case of a diaphragmatic hernia simulating on chest radiograph left lower lobe pneumonia and associated pleural effusion. We also characterize the atypical chest radiographic findings of this patient and recommend further imaging with computed tomography in unusual patient presentations.

  12. Dichotic Listening and Left-Right Confusion

    ERIC Educational Resources Information Center

    Hirnstein, Marco

    2011-01-01

    The present study examined the relationship between individual differences in dichotic listening (DL) and the susceptibility to left-right confusion (LRC). Thirty-six men and 59 women completed a consonant-vowel DL test, a behavioral LRC task, and an LRC self-rating questionnaire. Significant negative correlations between overall DL accuracy and…

  13. Research Between the Right and Left.

    ERIC Educational Resources Information Center

    Dyer, Henry S.

    This paper explores 2 concepts, institutional research in higher education and what is called the Left-Right Continuum, and suggests that periods of conflict provide better opportunities for meaningful institutional research than when the campus is quiet. To ensure the health of a college, interinstitutional research and intrainstitutional…

  14. The Future of No Child Left Behind

    ERIC Educational Resources Information Center

    Ravitch, Diane; Chubb, John E.

    2009-01-01

    More than seven years ago, President George W. Bush signed No Child Left Behind (NCLB) into law. Sweeping calls for testing, intervening in persistently low-performing schools, and policing teacher quality made it the most ambitious legislation on K-12 schooling in American history. The law, due for congressional reauthorization in 2007, still…

  15. Wingbeat kinematics and motor control of yaw turns in Anna's hummingbirds (Calypte anna).

    PubMed

    Altshuler, Douglas L; Quicazán-Rubio, Elsa M; Segre, Paolo S; Middleton, Kevin M

    2012-12-01

    The biomechanical and neuromuscular mechanisms used by different animals to generate turns in flight are highly variable. Body size and body plan exert some influence, e.g. birds typically roll their body to orient forces generated by the wings whereas insects are capable of turning via left-right wingbeat asymmetries. Turns are also relatively brief and have low repeatability, with almost every wingbeat serving a different function throughout the change in heading. Here we present an analysis of Anna's hummingbirds (Calypte anna) as they fed continuously from an artificial feeder revolving around the outside of the animal. This setup allowed for examination of sustained changes in yaw without requiring any corresponding changes in pitch, roll or body position. Hummingbirds sustained yaw turns by expanding the wing stroke amplitude of the outer wing during the downstroke and by altering the deviation of the wingtip path during both downstroke and upstroke. The latter led to a shift in the inner-outer stroke plane angle during the upstroke and shifts in the elevation of the stroke plane and in the deviation of the wingtip path during both strokes. These features are generally more similar to how insects, as opposed to birds, turn. However, time series analysis also revealed considerable stroke-to-stroke variation. Changes in the stroke amplitude and the wingtip velocity were highly cross-correlated, as were changes in the stroke deviation and the elevation of the stroke plane. As was the case for wingbeat kinematics, electromyogram recordings from pectoral and wing muscles were highly variable, but no correlations were found between these two features of motor control. The high variability of both kinematic and muscle activation features indicates a high level of wingbeat-to-wingbeat adjustments during sustained yaw. The activation timing of the muscles was more repeatable than the activation intensity, which suggests that the former may be constrained by harmonic

  16. STS-92 Pilot Melroy is ready to take her turn driving the M-113

    NASA Technical Reports Server (NTRS)

    2000-01-01

    STS-92 Pilot Pam Melroy is ready to take her turn driving the M- 113, part of emergency egress training during Terminal Countdown Demonstration Test (TCDT) activities. Behind her, waiting to take their turn, are (left to right) Mission Specialist Jeff Wisoff, Commander Brian Duffy, and Mission Specialists Bill McArthur and Michael Lopez-Alegria. The tracked vehicle could be used by the crew in the event of an emergency at the pad during which the crew must make a quick exit from the area. The TCDT also provides simulated countdown exercises and opportunities to inspect the mission payloads in the orbiter's payload bay. STS-92 is scheduled to launch Oct. 5 at 9:30 p.m. EDT on the fifth flight to the International Space Station. It will carry two elements of the Space Station, the Integrated Truss Structure Z1 and the third Pressurized Mating Adapter. The mission is also the 100th flight in the Shuttle program.

  17. Body posture recognition and turning recording system for the care of bed bound patients.

    PubMed

    Hsiao, Rong-Shue; Mi, Zhenqiang; Yang, Bo-Ru; Kau, Lih-Jen; Bitew, Mekuanint Agegnehu; Li, Tzu-Yu

    2015-01-01

    This paper proposes body posture recognition and turning recording system for assisting the care of bed bound patients in nursing homes. The system continuously detects the patient's body posture and records the length of time for each body posture. If the patient remains in the same body posture long enough to develop pressure ulcers, the system notifies caregivers to change the patient's body posture. The objective of recording is to provide the log of body turning for querying of patients' family members. In order to accurately detect patient's body posture, we developed a novel pressure sensing pad which contains force sensing resistor sensors. Based on the proposed pressure sensing pad, we developed a bed posture recognition module which includes a bed posture recognition algorithm. The algorithm is based on fuzzy theory. The body posture recognition algorithm can detect the patient's bed posture whether it is right lateral decubitus, left lateral decubitus, or supine. The detected information of patient's body posture can be then transmitted to the server of healthcare center by the communication module to perform the functions of recording and notification. Experimental results showed that the average posture recognition accuracy for our proposed module is 92%. PMID:26444814

  18. Left ventricular function in chronic aortic regurgitation

    SciTech Connect

    Iskandrian, A.S.; Hakki, A.H.; Manno, B.; Amenta, A.; Kane, S.A.

    1983-06-01

    Left ventricular performance was determined in 42 patients with moderate or severe aortic regurgitation during upright exercise by measuring left ventricular ejection fraction and volume with radionuclide ventriculography. Classification of the patients according to exercise tolerance showed that patients with normal exercise tolerance (greater than or equal to 7.0 minutes) had a significantly higher ejection fraction at rest (probability (p) . 0.02) and during exercise (p . 0.0002), higher cardiac index at exercise (p . 0.0008) and lower exercise end-systolic volume (p . 0.01) than did patients with limited exercise tolerance. Similar significant differences were noted in younger patients compared with older patients in ejection fraction at rest and exercise (both p . 0.001) and cardiac index at rest (p . 0.03) and exercise (p . 0.0005). The end-diastolic volume decreased during exercise in 60% of the patients. The patients with a decrease in volume were significantly younger and had better exercise tolerance and a larger end-diastolic volume at rest than did patients who showed an increase in volume. The mean corrected left ventricular end-diastolic radius/wall thickness ratio was significantly greater in patients with abnormal than in those with normal exercise reserve (mean +/- standard deviation 476 +/- 146 versus 377 +/- 92 mm Hg, p less than 0.05). Thus, in patients with chronic aortic regurgitation: 1) left ventricular systolic function during exercise was related to age, exercise tolerance and corrected left ventricular end-diastolic radius/wall thickness ratio, and 2) the end-diastolic volume decreased during exercise, especially in younger patients and patients with normal exercise tolerance or a large volume at rest.

  19. Turn-ons and turn-offs: Causes and mechanisms of the initiation and termination of coral reef growth

    SciTech Connect

    Buddemeier, R.W.; Hopley, D.

    1988-04-26

    The objective of this review is to develop and organize a conceptual framework for the discussion of the mechanisms of reef growth turn-on and turn-off. An improved understanding of the causes, mechanisms and short-term symptoms of reef turn-on/turn-off is essential if we are to deal with the challenge of understanding and managing reef resources under conditions of both immediate anthropogenic impacts and long-term climatic changes. The discussion attempts to provide a basis for identifying the future research and conceptual synthesis that can best improve both our understanding of the causes of past transitions in reef development and our abiltiy to predict with confidence the future outcome of presently changing conditions.

  20. Stripper-foil scan studies of the first-turn beam loss mechanism in the LAMPF proton storage ring (PSR)

    SciTech Connect

    Hutson, R.: Fitzgerald, D.; Frankle, S.; Macek, R.; Plum, M.; Wilkinson, C.

    1993-06-01

    First-turn beam losses in the LAMPF Proton Storage Ring were measured as a function of the left-right position of the carbon foil used to strip neutral hydrogen atoms to H{sup +} for proton injection into the PSR. Two foil thicknesses, 200 and 300 {mu}g/cm{sup 2}, were tested. Results indicated that first-turn loss is caused predominately by magnetic field stripping of a small fraction of the H{sub 0} atoms that pass through the stripper foil without being stripped to protons, and the results were not consistent with a mechanism involving protons originating from atoms in the halo of the neutral beam incident on the stripper foil.

  1. Stripper-foil scan studies of the first-turn beam loss mechanism in the LAMPF proton storage ring (PSR)

    SciTech Connect

    Hutson, R.: Fitzgerald, D.; Frankle, S.; Macek, R.; Plum, M.; Wilkinson, C.

    1993-01-01

    First-turn beam losses in the LAMPF Proton Storage Ring were measured as a function of the left-right position of the carbon foil used to strip neutral hydrogen atoms to H[sup +] for proton injection into the PSR. Two foil thicknesses, 200 and 300 [mu]g/cm[sup 2], were tested. Results indicated that first-turn loss is caused predominately by magnetic field stripping of a small fraction of the H[sub 0] atoms that pass through the stripper foil without being stripped to protons, and the results were not consistent with a mechanism involving protons originating from atoms in the halo of the neutral beam incident on the stripper foil.

  2. STS-92 Mission Specialist McArthur is ready to take his turn driving the M-113

    NASA Technical Reports Server (NTRS)

    2000-01-01

    STS-92 Mission Specialist Bill McArthur gets ready to take his turn at driving the M-113, part of emergency egress training during Terminal Countdown Demonstration Test (TCDT) activities. Behind him (left) is Mission Specialist Jeff Wisoff, waiting his turn to drive along with other unidentified crew members. The tracked vehicle could be used by the crew in the event of an emergency at the pad during which the crew must make a quick exit from the area. The TCDT also provides simulated countdown exercises and opportunities to inspect the mission payloads in the orbiter's payload bay. STS-92 is scheduled to launch Oct. 5 at 9:30 p.m. EDT on the fifth flight to the International Space Station. It will carry two elements of the Space Station, the Integrated Truss Structure Z1 and the third Pressurized Mating Adapter. The mission is also the 100th flight in the Shuttle program.

  3. Left on the right: allochiria in a case of left visuo-spatial neglect.

    PubMed Central

    Halligan, P W; Marshall, J C; Wade, D T

    1992-01-01

    A patient with left visuo-spatial neglect after right fronto-parietal haemorrhage failed to cross out stimuli in left space on cancellation tests. Her bisections of horizontal lines were displaced significantly to the right of true centre. On drawing and copying tasks, she sometimes omitted features on the left (neglect) and sometimes transposed them to right space (allochiria). This co-occurrence of neglect and allochiria has been observed previously but has provoked little theoretical comment. We draw attention to aspects of the combination that seem critical to the interpretation of visuo-spatial neglect. Images PMID:1527545

  4. Misremembering a common object: when left is not right.

    PubMed

    Jones, G V

    1990-03-01

    Three experiments were carried out to investigate people's memory for British coins. Two principal issues were studied. First, it has previously been shown that memory for U.S. pennies and other coins is surprisingly imperfect. How do other countries compare? It turned out that recall of the design of British pennies was, if anything, worse even than that of U.S. pennies. The situation was no better for a larger coin with an unusual shape. It is suggested that individual features are poorly remembered if they have low levels of meaningfulness, redundancy, identifiability, and discriminativeness. Second, in addition to this generally weak level of remembering, an instance of systematic misremembering was consistently observed. The Queen's portrait always faces to the right on British coins. Yet in all three experiments, the proportion of participants who recalled that the portrait faces to the right was so low (overall, 19%) that it was significantly less than even the 50% baseline to be expected from people in a state of complete ignorance. It follows that the participants were not in a state of complete ignorance. Rather, they relied upon extraneous knowledge of either a general or a specific nature (bias and schema hypotheses, respectively), whose importation into this domain was in fact invalid. The resulting belief that coin portraits face left was not right.

  5. Semiautomatic machine for turning inside out industrial leather gloves

    NASA Astrophysics Data System (ADS)

    Aragón-Gonzalez, G.; Cano-Blanco, M.; León-Galicia, A.; Medrano-Sierra, L. F.; Morales-Gómez, J. R.

    2015-01-01

    The last step in the industrial leather gloves manufacturing is to turn the inside out so that the sewing be in the inside of the glove. This work presents the design and testing of a machine for that purpose. In order to quantify the relevant variables, testing was performed with a prototype glove. The employed devices and the testing proceeding were developed experimentally. The obtained information was used to build the turning inside out machine. This machine works with pneumatic power to carry the inside out turning by means of double effect lineal actuators. It has two independent work stations that could be operated simultaneously by two persons, one in each station or in single mode operating one station by one person. The turning inside out cycle is started by means of directional control valves operated with pedals. The velocity and developed force by the actuators is controlled with typical pneumatic resources. The geometrical dimensions of the machine are: 1.15 m length; 0.71 m width and 2.15 m high. Its approximated weight is 120 kg. The air consumption is 5.4 fps by each working station with 60 psig work pressure. The turning inside out operation is 40 s for each industrial leather glove.

  6. Breath holding during the turn in competitive swimming.

    PubMed

    Craig, A B

    1986-08-01

    Breath holding times were measured during competition and averaged 5.0 sec in the breaststroke events, 4.3 sec in freestyle, 3.7 sec in butterfly, and 3.3 sec in backstroke. These times represented approximately 30% of the total time of swimming breaststroke and freestyle races but only 20% of the time of backstroke and butterfly events. Pulmonary gas exchanges of O2 and CO2 were studied in eight male swimmers during the first turn after the start of a swim and during the third turn after continuous swimming. It was concluded that biomechanical considerations of optimizing a turn are in most circumstances not limited by the increased PCO2 and the decreased PO2 in the alveoli related to the brief period of breath holding. In turns which last longer than about 5.5 s, the swimmers may experience a strong urge to breathe. This "breaking point" sensation is brief and need not compromise the conclusion of a well-executed turn. PMID:3747799

  7. Reconstruction of the left-sided brachiocephalic trunk after vascular ring operation in left-handed child with Kommerell's diverticulum.

    PubMed

    Haponiuk, Ireneusz; Paczkowski, Konrad; Chojnicki, Maciej; Jaworski, Radosław; Steffens, Mariusz; Szofer-Sendrowska, Aneta; Kwaśniak, Ewelina; Zieliński, Jacek; Gierat-Haponiuk, Katarzyna

    2013-01-01

    We report a case of a 2-year-old girl with prenatal diagnosis of vascular ring composed of a right-sided aortic arch, a left ligamentum arteriosum, and a left subclavian artery (arteria lusoria sin) originating from a retroesophageal Kommerell's diverticulum, who was referred for surgery with symptoms related to local compression - severe dysphagia and respiratory disorders. Through the left posterolateral thoracotomy, a ligamentum arteriosum between the Kommerell's diverticulum and the left pulmonary artery was divided and because of left-handedness of the child a brachiocephalic trunk was reconstructed in the fashion of anastomosis of the left subclavian artery and the left common carotid artery, originating from the ascending aorta.

  8. Dyscalculia, Dysgraphia, and Left-Right Confusion from a Left Posterior Peri-Insular Infarct

    PubMed Central

    Bhattacharyya, S.; Cai, X.; Klein, J. P.

    2014-01-01

    The Gerstmann syndrome of dyscalculia, dysgraphia, left-right confusion, and finger agnosia is generally attributed to lesions near the angular gyrus of the dominant hemisphere. A 68-year-old right-handed woman presented with sudden difficulty completing a Sudoku grid and was found to have dyscalculia, dysgraphia, and left-right confusion. Magnetic resonance imaging (MRI) showed a focus of abnormal reduced diffusivity in the left posterior insula and temporoparietal operculum consistent with acute infarct. Gerstmann syndrome from an insular or peri-insular lesion has not been described in the literature previously. Pathological and functional imaging studies show connections between left posterior insular region and inferior parietal lobe. We postulate that the insula and operculum lesion disrupted key functional networks resulting in a pseudoparietal presentation. PMID:24817791

  9. Dyscalculia, dysgraphia, and left-right confusion from a left posterior peri-insular infarct.

    PubMed

    Bhattacharyya, S; Cai, X; Klein, J P

    2014-01-01

    The Gerstmann syndrome of dyscalculia, dysgraphia, left-right confusion, and finger agnosia is generally attributed to lesions near the angular gyrus of the dominant hemisphere. A 68-year-old right-handed woman presented with sudden difficulty completing a Sudoku grid and was found to have dyscalculia, dysgraphia, and left-right confusion. Magnetic resonance imaging (MRI) showed a focus of abnormal reduced diffusivity in the left posterior insula and temporoparietal operculum consistent with acute infarct. Gerstmann syndrome from an insular or peri-insular lesion has not been described in the literature previously. Pathological and functional imaging studies show connections between left posterior insular region and inferior parietal lobe. We postulate that the insula and operculum lesion disrupted key functional networks resulting in a pseudoparietal presentation. PMID:24817791

  10. Revisiting the left-wing response to sociobiology: the case of Finland in a European context.

    PubMed

    Lepistö, Antti

    2015-01-01

    This article revisits the left-wing response to sociobiology in the 1970s and 1980s by examining the sociobiology debate in Finland in a larger European context. It argues that the Finnish academic left's response to sociobiology represents a "third way" alongside the purely negative, often Marxist denial of biology's relevance, which characterized the left's response to sociobiology in many European countries such as Hungary and Sweden, and alongside the disregard that sociobiology confronted in most parts of Eastern Europe, as well as in Germany. In the context of the last great political conflict of the Cold War in Europe, the controversy over the American "Euromissiles" (Pershing II and Tomahawk) in 1979-1983, the Finnish academic left challenged the allegedly fatalistic sociobiological aggression and war theories with an alternative biological language, turning the increasing enthusiasm over evolutionary ideas into a pacifist cause. Using leftist and pacifist forums to inform citizens and politicians of such biologically evolved human characteristics as mutual care and sociability, the Finnish critics of sociobiology wished to boost the public spirit, and to rationalize the pacifist ideal of the European-wide popular movement against nuclear weapons and militarism. As a result, the academic leftists in Finland revived the early twentieth-century tradition of "peace biology." A proper understanding of this development calls for an analysis that acknowledges Finland's special geopolitical and cultural position in the Cold War world between East and West. PMID:24990454

  11. Revisiting the left-wing response to sociobiology: the case of Finland in a European context.

    PubMed

    Lepistö, Antti

    2015-01-01

    This article revisits the left-wing response to sociobiology in the 1970s and 1980s by examining the sociobiology debate in Finland in a larger European context. It argues that the Finnish academic left's response to sociobiology represents a "third way" alongside the purely negative, often Marxist denial of biology's relevance, which characterized the left's response to sociobiology in many European countries such as Hungary and Sweden, and alongside the disregard that sociobiology confronted in most parts of Eastern Europe, as well as in Germany. In the context of the last great political conflict of the Cold War in Europe, the controversy over the American "Euromissiles" (Pershing II and Tomahawk) in 1979-1983, the Finnish academic left challenged the allegedly fatalistic sociobiological aggression and war theories with an alternative biological language, turning the increasing enthusiasm over evolutionary ideas into a pacifist cause. Using leftist and pacifist forums to inform citizens and politicians of such biologically evolved human characteristics as mutual care and sociability, the Finnish critics of sociobiology wished to boost the public spirit, and to rationalize the pacifist ideal of the European-wide popular movement against nuclear weapons and militarism. As a result, the academic leftists in Finland revived the early twentieth-century tradition of "peace biology." A proper understanding of this development calls for an analysis that acknowledges Finland's special geopolitical and cultural position in the Cold War world between East and West.

  12. Testosterone affects hormone-sensitive lipase (HSL) activity and lipid metabolism in the left ventricle.

    PubMed

    Langfort, Jozef; Jagsz, Slawomir; Dobrzyn, Pawel; Brzezinska, Zofia; Klapcinska, Barbara; Galbo, Henrik; Gorski, Jan

    2010-09-01

    Fatty acids, which are the major cardiac fuel, are derived from lipid droplets stored in cardiomyocytes, among other sources. The heart expresses hormone-sensitive lipase (HSL), which regulates triglycerides (TG) breakdown, and the enzyme is under hormonal control. Evidence obtained from adipose tissue suggests that testosterone regulates HSL activity. To test whether this is also true in the heart, we measured HSL activity in the left ventricle of sedentary male rats that had been treated with testosterone supplementation or orchidectomy with or without testosterone substitution. Left ventricle HSL activity against TG was significantly elevated in intact rats supplemented with testosterone. HSL activity against both TG and diacylglyceride was reduced by orchidectomy, whereas testosterone replacement fully reversed this effect. Moreover, testosterone increased left ventricle free fatty acid levels, caused an inhibitory effect on carbohydrate metabolism in the heart, and elevated left ventricular phosphocreatine and ATP levels as compared to control rats. These data indicate that testosterone is involved in cardiac HSL activity regulation which, in turn, may affect cardiac lipid and carbohydrate metabolism.

  13. Flow and heat transfer in 180-degree turn square ducts: Effects of turning configuration and system rotation

    NASA Astrophysics Data System (ADS)

    Wang, Ten-See; Chyu, Ming-King

    1993-07-01

    Forced flow through channels connected by sharp bends is frequently encountered in various rocket and gas turbine engines. For example, the transfer ducts, the coolant channels surround the combustion chamber, the internal cooling passage in a blade or vane, the flow path in the fuel element of a nuclear rocket engine, the flow around a pressure relieve valve piston, and the recirculated base flow of multiple engine clustered nozzles. Transport phenomena involved in such a flow passage are complex and considered to be very different from those of conventional turning flow with relatively mild radii of curvature. While previous research pertaining to this subject has been focused primarily on the experimental heat transfer, very little analytical work is directed to understanding the flowfield and energy transport in the passage. Therefore, the primary goal of this paper is to benchmark the predicted wall heat fluxes using a state-of-the-art computational fluid dynamics (CFD) formulation against those of measurement for a rectangular turn duct. Other secondary goals include studying the effects of turning configurations, e.g., the semi-circular turn, and the rounded-corner turn, and the effect of system rotation. The computed heat fluxes for the rectangular turn duct compared favorably with those of the experimental data. The results show that the flow pattern, pressure drop, and heat transfer characteristics are different among the three turning configurations, and are substantially different with system rotation. Also demonstrated in this work is that the present computational approach is quite effective and efficient and will be suitable for flow and thermal modeling in rocket and turbine engine applications.

  14. Patient selection for left ventricular assist devices.

    PubMed

    Lund, Lars H; Matthews, Jennifer; Aaronson, Keith

    2010-05-01

    Heart transplantation (HTx) improves symptoms and prolongs life in advanced heart failure (HF), but organ supply is limited. In recent years, mechanical circulatory support and specifically implantable left ventricular assist devices (LVADs) have undergone technical improvements, and outcomes have improved dramatically. Left ventricular assist devices are now viable options for patients with severe HF as bridge to transplantation, destination therapy, or as bridge to recovery. Many believe that LVADs may soon provide outcomes similar to, or better than, HTx, launching a new era of end-stage HF management. The key to improving outcomes is patient selection, but the field is changing rapidly and guidelines and consensus are limited. This review summarizes recent reports of predictors of poor outcomes and provides an overview of selection for LVAD therapy. PMID:20172939

  15. Left Brain, Right Brain: Facts and Fantasies

    PubMed Central

    Corballis, Michael C.

    2014-01-01

    Summary Handedness and brain asymmetry are widely regarded as unique to humans, and associated with complementary functions such as a left-brain specialization for language and logic and a right-brain specialization for creativity and intuition. In fact, asymmetries are widespread among animals, and support the gradual evolution of asymmetrical functions such as language and tool use. Handedness and brain asymmetry are inborn and under partial genetic control, although the gene or genes responsible are not well established. Cognitive and emotional difficulties are sometimes associated with departures from the “norm” of right-handedness and left-brain language dominance, more often with the absence of these asymmetries than their reversal. PMID:24465175

  16. Global aphasia due to left thalamic hemorrhage.

    PubMed

    Ozeren, Ali; Koc, Filiz; Demirkiran, Meltem; Sönmezler, Abdurrahman; Kibar, Mustafa

    2006-12-01

    Global aphasia is an acquired language disorder characterized by severe impairments in all modalities of language. The specific sites of injury commonly include Wernike's and Broca's areas and result from large strokes--particularly those involving the internal carotid or middle cerebral arteries. Rarely, deep subcortical lesions may cause global aphasia. We present three cases with global aphasia due to a more rare cause: left thalamic hemorrhage. Their common feature was the large size of the hemorrhage and its extension to the third ventricule. HMPAO-SPECT in one of the cases revealed ipsilateral subcortical, frontotemporal cortical and right frontal cortical hypoperfusion. Left thalamic hemorrhage should be considered in the differential diagnosis of global aphasia. PMID:17114855

  17. Minimal Left-Right Symmetric Dark Matter.

    PubMed

    Heeck, Julian; Patra, Sudhanwa

    2015-09-18

    We show that left-right symmetric models can easily accommodate stable TeV-scale dark matter particles without the need for an ad hoc stabilizing symmetry. The stability of a newly introduced multiplet either arises accidentally as in the minimal dark matter framework or comes courtesy of the remaining unbroken Z_{2} subgroup of B-L. Only one new parameter is introduced: the mass of the new multiplet. As minimal examples, we study left-right fermion triplets and quintuplets and show that they can form viable two-component dark matter. This approach is, in particular, valid for SU(2)×SU(2)×U(1) models that explain the recent diboson excess at ATLAS in terms of a new charged gauge boson of mass 2 TeV.

  18. Left Ventricular Noncompaction: A Distinct Genetic Cardiomyopathy?

    PubMed

    Arbustini, Eloisa; Favalli, Valentina; Narula, Nupoor; Serio, Alessandra; Grasso, Maurizia

    2016-08-30

    Left ventricular noncompaction (LVNC) describes a ventricular wall anatomy characterized by prominent left ventricular (LV) trabeculae, a thin compacted layer, and deep intertrabecular recesses. Individual variability is extreme, and trabeculae represent a sort of individual "cardioprinting." By itself, the diagnosis of LVNC does not coincide with that of a "cardiomyopathy" because it can be observed in healthy subjects with normal LV size and function, and it can be acquired and is reversible. Rarely, LVNC is intrinsically part of a cardiomyopathy; the paradigmatic examples are infantile tafazzinopathies. When associated with LV dilation and dysfunction, hypertrophy, or congenital heart disease, the genetic cause may overlap. The prevalence of LVNC in healthy athletes, its possible reversibility, and increasing diagnosis in healthy subjects suggests cautious use of the term LVNC cardiomyopathy, which describes the morphology but not the functional profile of the cardiomyopathy. PMID:27561770

  19. Left brain, right brain: facts and fantasies.

    PubMed

    Corballis, Michael C

    2014-01-01

    Handedness and brain asymmetry are widely regarded as unique to humans, and associated with complementary functions such as a left-brain specialization for language and logic and a right-brain specialization for creativity and intuition. In fact, asymmetries are widespread among animals, and support the gradual evolution of asymmetrical functions such as language and tool use. Handedness and brain asymmetry are inborn and under partial genetic control, although the gene or genes responsible are not well established. Cognitive and emotional difficulties are sometimes associated with departures from the "norm" of right-handedness and left-brain language dominance, more often with the absence of these asymmetries than their reversal. PMID:24465175

  20. Left-sided hemihypomimia in Parkinson's disease.

    PubMed

    Crosiers, David; Maréchal, Emke; van Ael, Yannick; Cras, Patrick

    2011-09-01

    Parkinson's disease is known to present and mostly persist as an asymmetrical movement disorder in most cases. The asymmetry is mainly described in motor features such as bradykinesia, rigidity and tremor in upper and lower limbs. Unilateral hypomimia however, has only been reported in 14 patients, all of whom showed right-sided hemihypomimia. In this case report we describe the symptoms of a 51-year-old man with predominant left-sided Parkinson's disease in whom we discovered a left-sided hemihypomimia. We also briefly review the literature concerning hemihypomimia in Parkinson's disease. We conclude that a larger case series needs to be studied to further elucidate the pathophysiology and clinical implications of this observation.

  1. Coarctation of the aorta associated with agenesis of left common carotid artery and left subclavian artery

    PubMed Central

    Yang, Yang; Ding, Shiao; Xu, Gaojun; Liu, Hao

    2016-01-01

    We describe the case of a 10-year-old boy with coarctation of the aorta complicated by innominate artery stenosis and agenesis of left common carotid artery and left subclavian artery. The patient was treated with an interposition graft between the ascending and descending aorta. The right subclavian was revascularized with another graft from the interposition graft to the distal right subclavian. This is a rare case of the combination of coarctation of the aorta and other vascular malformations. PMID:27162694

  2. Does dragonfly's abdomen flexion help with fast turning maneuvers?

    NASA Astrophysics Data System (ADS)

    Liu, Geng; Li, Chengyu; Dong, Haibo; Flow Simulation Research Group Team

    2013-11-01

    Dragonflies are able to achieve fast turning maneuvers during take-off flights. Both asymmetric wing flapping and abdomen flexion have been observed during the fast turning. It's widely thought that the asymmetric wing beats are responsible of producing the aerodynamic moment needed for the body rotation. However, the dynamic effect of the abdomen flexion is not clear yet. In this study, an integrated experimental and computational approach is used to study the underlying dynamic effect of dragonfly abdomen flexion. It's found that dragonfly abdomen tended to bend towards the same side as the body reorienting to. Quantitative analysis have shown that during take-off turning maneuver the abdomen flexion can modulate the arm of force by changing the position of the center of mass relative to the thorax. As a result, roll and yaw moments produced by the wing flapping can be enhanced. This work is supported by NSF CBET-1313217. This work is supported by NSF CBET-1313217.

  3. Turning points in long distance grandparent-grandchild relationships.

    PubMed

    Bangerter, Lauren R; Waldron, Vincent R

    2014-04-01

    This study examines changes in long-distance relationships between grandparents and their adolescent grandchildren by identifying relational turning points and trajectories. Qualitative analysis of data collected from interviews with grandparents yielded 100 unique turning points. Constant comparative analysis revealed eight distinct categories of relational turning points; Spending Time Together, Family Relational Dynamics, Geographic Distance, Lack of Relational Investment, Use of Technology, Relational Investment, Lack of Free Time, and Grandchild Gaining Independence. These varied in the degree to which they positively or negatively impacted relational closeness. Application of the Retrospective Interview Technique (RIT) yielded five distinctive relational trajectories: Decrease in Closeness, Increase in Closeness, Multidimensional Changes in Closeness, Minimal Changes in Closeness, and Consistent Relational Closeness. The results expose the communicative challenges faced by long-distance-grandparents, the diversity of these relationships, and the ways in which grandparenting bonds change over time. Implications for an enriched understanding of grandparenting relationships and practical applications for families are explored. PMID:24655676

  4. Non-Poissonian run-and-turn motions

    NASA Astrophysics Data System (ADS)

    Detcheverry, Francois

    Swimming bacteria exhibit a variety of motion patterns (run-and-tumble, run-reverse, run-reverse-flick), in which persistent runs are punctuated by sudden turning events. What are the properties of such random motions? If a complete answer has been given when the turning events follow a Poisson process, it has remained elusive outside this particular case. We present a generic framework for such non-Poissonian run-and-turn random motions. We obtain the generating function of moments by building on the framework of continuous time random walks and using non-commutative calculus. The approach is applied to a bimodal model of persistent motion that is directly applicable to swimming patterns and cell motility.

  5. Singular perturbations and vanishing passage through a turning point

    NASA Astrophysics Data System (ADS)

    De Maesschalck, P.; Dumortier, F.

    The paper deals with planar slow-fast cycles containing a unique generic turning point. We address the question on how to study canard cycles when the slow dynamics can be singular at the turning point. We more precisely accept a generic saddle-node bifurcation to pass through the turning point. It reveals that in this case the slow divergence integral is no longer the good tool to use, but its derivative with respect to the layer variable still is. We provide general results as well as a number of applications. We show how to treat the open problems presented in Artés et al. (2009) [1] and Dumortier and Rousseau (2009) [13], dealing respectively with the graphics DI2a and DF1a from Dumortier et al. (1994) [14].

  6. [Takotsubo syndrome. Transient left ventricular dyskinesia].

    PubMed

    Pérez Pérez, F M; Sánchez Salado, J

    2014-03-01

    The Takotsubo syndrome, also called transient apical dyskinesia syndrome, was first described in Japan in the 1990s. It is a rare entity found in almost 1% of all patients with suspicion of acute coronary syndrome. It usually affects postmenopausal women with a few cardiovascular risk factors. It is characterized by angina-type chest pain, electrocardiographic changes, elevation of the enzymes of myocardial injury, absence of coronary obstruction on angiography, and a characteristic left ventricular anteroapical dyskinesia, which returns to normal within a few days. Severe emotional stress is the most common trigger for this syndrome. The aetiopathogenesis of this syndrome remains to be defined. This syndrome has been considered a clinical condition since 2001, when a series of 88 cases was published. It is a disease with a partially known mechanism, characterised by the morphology adopted by the left ventricle secondary to hypokinesis or dyskinesia of the apical segments, and hypercontractility of basal segments. Unlike acute coronary syndrome, patients with left ventricle dysfunction do not have atherothrombotic disease in the coronary arteries. In addition, the alterations described are reversible. Some clinical diagnostic criteria have been proposed, although they are still controversial, as well as in the complementary examinations required for diagnosis.

  7. Hemispatial Neglect Shows That "Before" Is "Left".

    PubMed

    Bonato, Mario; Saj, Arnaud; Vuilleumier, Patrik

    2016-01-01

    Recent research has led to the hypothesis that events which unfold in time might be spatially represented in a left-to-right fashion, resembling writing direction. Here we studied fourteen right-hemisphere damaged patients, with or without neglect, a disorder of spatial awareness affecting contralesional (here left) space processing and representation. We reasoned that if the processing of time-ordered events is spatial in nature, it should be impaired in the presence of neglect and spared in its absence. Patients categorized events of a story as occurring before or after a central event, which acted as a temporal reference. An asymmetric distance effect emerged in neglect patients, with slower responses to events that took place before the temporal reference. The event occurring immediately before the reference elicited particularly slow responses, closely mirroring the pattern found in neglect patients performing numerical comparison tasks. Moreover, the first item elicited significantly slower responses than the last one, suggesting a preference for a left-to-right scanning/representation of events in time. Patients without neglect showed a regular and symmetric distance effect. These findings further suggest that the representation of events order is spatial in nature and provide compelling evidence that ordinality is similarly represented within temporal and numerical domains. PMID:27313902

  8. Connecting Dirac and Majorana neutrino mass matrices in the minimal left-right symmetric model.

    PubMed

    Nemevšek, Miha; Senjanović, Goran; Tello, Vladimir

    2013-04-12

    Probing the origin of neutrino mass by disentangling the seesaw mechanism is one of the central issues of particle physics. We address it in the minimal left-right symmetric model and show how the knowledge of light and heavy neutrino masses and mixings suffices to determine their Dirac Yukawa couplings. This in turn allows one to make predictions for a number of high and low energy phenomena, such as decays of heavy neutrinos, neutrinoless double beta decay, electric dipole moments of charged leptons, and neutrino transition moments. We also discuss a way of reconstructing the neutrino Dirac Yukawa couplings at colliders such as the LHC.

  9. Effect of transmitter turn-off time on transient soundings

    USGS Publications Warehouse

    Fitterman, D.V.; Anderson, W.L.

    1987-01-01

    A general procedure for computing the effect of non-zero turn-off time on the transient electromagnetic response is presented which can be applied to forward and inverse calculation methods for any transmitter-receiver configuration. We consider in detail the case of a large transmitter loop which has a receiver coil located at the center of the loop (central induction or in-loop array). For a linear turn-off ramp of width t0, the voltage response is shown to be the voltage due to an ideal step turn-off averaged over windows of width t0. Thus the effect is similar to that obtained by using averaging windows in the receiver. In general when time zero is taken to be the end of the ramp, the apparent resistivity increases for a homogeneous half-space over a limited time range. For time zero taken to be the start of the ramp the apparent resistivity is affected in the opposite direction. The effect of the ramp increases with increasing t0 and first-layer resistivity, is largest during the intermediate stage, and decreases with increasing time. It is shown that for a ramp turn-off, there is no effect in the early and late stages. For two-layered models with a resistive first layer (??1>??2), the apparent resistivity is increased in the intermediate stage. When the first layer is more conductive than the second layer (??1turn-off effect. Neglecting the turn-off ramp will affect data interpretation as shown by field examples; the influence is the greatest on near-surface layer parameters. ?? 1987.

  10. Peptide δ-Turn: Literature Survey and Recent Progress.

    PubMed

    Toniolo, Claudio; Crisma, Marco; Moretto, Alessandro; Peggion, Cristina; Formaggio, Fernando; Alemán, Carlos; Cativiela, Carlos; Ramakrishnan, Chandrasekharan; Balaram, Padmanabhan

    2015-09-28

    Among the various types of α-peptide folding motifs, δ-turn, which requires a central cis-amide disposition, has been one of the least extensively investigated. In particular, this main-chain reversal topology has been studied in-depth neither in linear/cyclic peptides nor in proteins. This Minireview article assembles and critically analyzes relevant data from a literature survey on the δ-turn conformation in those compounds. Unpublished results from recent conformational energy calculations and a preliminary solution-state analysis on a small model peptide, currently ongoing in our laboratories, are also briefly outlined.

  11. Symplectic full-turn maps in a Fourier representation

    SciTech Connect

    Berg, J.S. . Dept. of Physics); Warnock, R.L. )

    1991-05-01

    We have developed a method that uses an arbitrary symplectic tracking code to generate an exactly symplectic full-turn or multi-turn map. The map is obtained from a generating function, which is a finite Fourier series in the final angle coordinates, the Fourier coefficients being represented as a B-spline series in the initial action coordinates. We achieve fast iteration of this implicitly defined map, and good accuracy. As a first application, we treat a simplified model of arcs of the SSC. 5 refs., 1 fig.

  12. Cultural Composition: Stuart Hall on Ethnicity and the Discursive Turn.

    ERIC Educational Resources Information Center

    Drew, Julie

    1998-01-01

    Interviews Stuart Hall, a black public intellectual and an activist of the New Left. Discusses the growing disillusionment with cultural studies now that it is no longer in its ascendancy; the proliferation of pedagogical practices given a cultural studies tag; Hall's approval of the use of popular culture in the composition classroom; and the…

  13. Biased semantics for right and left in 50 Indo-European and non-Indo-European languages.

    PubMed

    Schiefenhövel, Wulf

    2013-06-01

    The negative bias accompanying the terms left and left-handers has long interested researchers. This paper examines a large number of languages of Indo-European and non-Indo-European origin for such biasing. One surprising outcome is that, within the Indo-European language family, the terms for right and left do not go back to one set of antonyms but have their etymological roots in a number of different core semantic concepts. As in the non-Indo-European languages, right is almost always thought of positively, whereas left is negatively connotated. This is interpreted as the outcome of a universal human evaluation process, partly based on the principle of embodiment. The terms for right never have, in any of the examined languages, a negative bias; the words for left, usually never positively biased, were turned into euphemisms in three language groups (Scandinavian, Greek, and Avestan). On one interpretation, this seems to be an act of historical political correctness, corroborating the negative attitude cultures have for left-handers, very likely an outcome of discrimination of minorities.

  14. States Need to Fill in the Gaps on Expanded Learning Time: Troubling Lack of Detail Seen in No Child Left Behind Waiver Applications

    ERIC Educational Resources Information Center

    Owen, Isabel

    2012-01-01

    Schedule redesign is only one small part of the much larger approach to turning around low-performing schools. Even so, most states' No Child Left Behind waiver applications show a disappointing lack of detail on learning time. While they've done some careful thinking about schedule redesign, states must continue to think critically and…

  15. Co-Teaching: An Educational Promise for Children with Disabilities or a Quick Fix to Meet the Mandates of No Child Left Behind?

    ERIC Educational Resources Information Center

    Nichols, Joe; Dowdy, Alana; Nichols, Cindy

    2010-01-01

    As educational leaders continue to struggle with the "Highly Qualified Teacher" mandate of the No Child Left Behind (NCLB) legislation, many are turning to co-teaching models that are designed to incorporate regular education and special education teachers into the same classroom to deliver instruction. This model appears to address the issue of…

  16. 4. VIEW OF VERTICAL BORING MACHINE. (Bullard) Vertical turning lathe ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW OF VERTICAL BORING MACHINE. (Bullard) Vertical turning lathe (VTL). Machining the fixture for GE Turboshroud. G.S. O'Brien, operator. - Juniata Shops, Machine Shop No. 1, East of Fourth Avenue at Third Street, Altoona, Blair County, PA

  17. ESU Turns 30! Fighting for Student Rights since 1982

    ERIC Educational Resources Information Center

    Ivosevic, Vanja, Ed.; Pall, Allan, Ed.; Primozic, Rok, Ed.; Slegers, Marianne, Ed.; Vukasovic, Martina, Ed.

    2012-01-01

    The beloved WESIB/ESIB/ESU (from here on labelled mostly as ESU) is turning 30 this October. This momentous occasion is of course a wonderful excuse to celebrate, but also an opportunity to reflect where the organization is and where it could be and to connect numerous generations of student activists that have made and will continue to make the…

  18. Diplomas Count 2013: Second Chances--Turning Dropouts into Graduates

    ERIC Educational Resources Information Center

    Education Week, 2013

    2013-01-01

    The 2013 edition of "Diplomas Count," entitled "Second Chances: Turning Dropouts into Graduates," examines dropout recovery and innovative strategies for returning to the educational fold the 1 million students who leave school without a diploma each year. "Education Week's" journalists investigate interventions that provide second chances to…

  19. Evaluation of environmentally safe cleaning agents for diamond turned optics

    SciTech Connect

    Theye, L.A.; Day, R.D.; Weinrach, J. ); Schubert, R. ); Seiffert, S. )

    1991-01-01

    Precision machining of metal surfaces using diamond turning has increased greatly in popularity at LANL in recent years. Similar techniques are used extensively to manufacture metal mirrors for use in laser applications. The diamond turned surfaces are easily damaged, making the selection of a cleaning agent very critical. These surfaces have been traditionally cleaned using Trichloroethane (TCA) to remove residual oil remaining from the machining process. The TCA was then removed with an ethanol rinse, leaving a residue free surface. Recently, however, TCA was pronounced environmentally unsafe. Consequently, we are searching for an environmentally safe cleaning agent for these diamond turned metal optics. The concern with using alternative solvents is the potential for residual surface films that produce reflectivity changes related to a combination of wavelength, surface coverage, film thickness and dielectric properties. Therefore, we have initiated a program for testing the effectiveness of a variety of environmentally safe solvents used to clean diamond turned optical surfaces. Our basic test plan consists of comparing a number of environmentally safe solvents against the TCA/ethanol cleaning system. We have identified twelve candidate solvents, but have only been able to perform a partial test on one of them to date. This paper discusses the results obtained to data using this solvent known as P F (1). 3 refs., 13 figs.

  20. Education, Inc.: Turning Learning into a Business. Revised Edition.

    ERIC Educational Resources Information Center

    Kohn, Alfie, Ed.; Shannon, Patrick, Ed.

    This collection of essays builds a case against those who see children as customers or workers and those who want to turn learning into a business. Following an introduction, The 500-Pound Gorilla by Alfie Kohn, section 1, Commercialism in Schools, contains: (1) Buy Me! Buy Me! (Alex Molnar and Joseph A. Reaves); (2) Commercialism in U.S. Schools…

  1. Evaluation of environmentally safe cleaning agents for diamond turned optics

    NASA Astrophysics Data System (ADS)

    Theye, Lonnie A.; Day, Robert D.; Weinrach, Jeffrey; Schubert, Rudolf; Seiffert, Stephen

    Precision machining of metal surfaces using diamond turning has increased greatly in popularity at LANL in recent years. Similar techniques are used extensively to manufacture metal mirrors for use in laser applications. The diamond turned surfaces are easily damaged, making the selection of a cleaning agent very critical. These surfaces have been traditionally cleaned using Trichloroethane (TCA) to remove residual oil remaining from the machining process. The TCA was then removed with an ethanol rinse, leaving a residue free surface. Recently, however, TCA was pronounced environmentally unsafe. Consequently, we are searching for an environmentally safe cleaning agent for these diamond turned metal optics. The concern with using alternative solvents is the potential for residual surface films that produce reflectivity changes related to a combination of wavelength, surface coverage, film thickness and dielectric properties. Therefore, we have initiated a program for testing the effectiveness of a variety of environmentally safe solvents used to clean diamond turned optical surfaces. Our basic test plan consists of comparing a number of environmentally safe solvents against the TCA/ethanol cleaning system. We have identified twelve candidate solvents, but have only been able to perform a partial test on one of them to date. This paper discusses the results obtained to date using this solvent known as P F.

  2. Bumblebee Homing: The Fine Structure of Head Turning Movements

    PubMed Central

    Boeddeker, Norbert; Mertes, Marcel; Dittmar, Laura; Egelhaaf, Martin

    2015-01-01

    Changes in flight direction in flying insects are largely due to roll, yaw and pitch rotations of their body. Head orientation is stabilized for most of the time by counter rotation. Here, we use high-speed video to analyse head- and body-movements of the bumblebee Bombus terrestris while approaching and departing from a food source located between three landmarks in an indoor flight-arena. The flight paths consist of almost straight flight segments that are interspersed with rapid turns. These short and fast yaw turns (“saccades”) are usually accompanied by even faster head yaw turns that change gaze direction. Since a large part of image rotation is thereby reduced to brief instants of time, this behavioural pattern facilitates depth perception from visual motion parallax during the intersaccadic intervals. The detailed analysis of the fine structure of the bees’ head turning movements shows that the time course of single head saccades is very stereotypical. We find a consistent relationship between the duration, peak velocity and amplitude of saccadic head movements, which in its main characteristics resembles the so-called "saccadic main sequence" in humans. The fact that bumblebee head saccades are highly stereotyped as in humans, may hint at a common principle, where fast and precise motor control is used to reliably reduce the time during which the retinal images moves. PMID:26352836

  3. A jump persistent turning walker to model zebrafish locomotion

    PubMed Central

    Mwaffo, Violet; Anderson, Ross P.; Butail, Sachit; Porfiri, Maurizio

    2015-01-01

    Zebrafish are gaining momentum as a laboratory animal species for the investigation of several functional and dysfunctional biological processes. Mathematical models of zebrafish behaviour are expected to considerably aid in the design of hypothesis-driven studies by enabling preliminary in silico tests that can be used to infer possible experimental outcomes without the use of zebrafish. This study is motivated by observations of sudden, drastic changes in zebrafish locomotion in the form of large deviations in turn rate. We demonstrate that such deviations can be captured through a stochastic mean reverting jump diffusion model, a process that is commonly used in financial engineering to describe large changes in the price of an asset. The jump process-based model is validated on trajectory data of adult subjects swimming in a shallow circular tank obtained from an overhead camera. Through statistical comparison of the empirical distribution of the turn rate against theoretical predictions, we demonstrate the feasibility of describing zebrafish as a jump persistent turning walker. The critical role of the jump term is assessed through comparison with a simplified mean reversion diffusion model, which does not allow for describing the heavy-tailed distributions observed in the fish turn rate. PMID:25392396

  4. Type 2 diabetes express highway, where is the 'U' turn?

    PubMed

    Iyer, S R

    2003-05-01

    The 'U' turn in Type 2 Diabetes Express Highway probably lies in lifestyle modifications--going back to traditional lifestyle with use of modern technology to achieve happiness. There is a difference between technology for comfort and technology for happiness. PMID:12974434

  5. Using Your Daily Newspaper to Turn On the Resistant Reader.

    ERIC Educational Resources Information Center

    Hawaii Newspaper Agency, Inc., Honolulu.

    One of a series prepared by the Hawaii Newspaper Agency, this teaching guide offers suggestions on using the daily newspaper to "turn on" the resistant reader. Sample materials describe how to use the 5 w's (who, what, where, when, why) and a H (how) to answer questions, read without words, play beginner's bridge, use comics for learning, watch…

  6. 6. INTERIOR VIEW, LOOKING SOUTH, WITH CAR 'DETRUCKED AND TURNED ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. INTERIOR VIEW, LOOKING SOUTH, WITH CAR 'DETRUCKED AND TURNED UPSIDE DOWN' FOR WELDING UNDERSIDE OF THE CAR AND INSIDE OF THE ROOF. IN FOREGROUND ARE THE WHEELS REMOVED TO FACILITATE ASSEMBLY. - Pullman Standard Company Plant, Fabrication Assembly Shop, 401 North Twenty-fourth Street, Bessemer, Jefferson County, AL

  7. Poets and Book Design at the Turn of the Century.

    ERIC Educational Resources Information Center

    Depas, Rosalind

    1979-01-01

    Considers influences on the design and production of books at the turn of the century, including the influences of symbolists and other European poets (e.g., Blake, Wilde, Verhaeren, Maeterlinck, Baudelaire, Mallarme, Huysmans, George, von Hofmannsthal, and Rilke); book designers, typographers, and printers; and the Art Nouveau school. (DMM)

  8. On Kinesic Triadic Relations in Turn-Taking

    ERIC Educational Resources Information Center

    Pike, Kenneth L.

    1975-01-01

    This article discusses three characteristics useful in defining the relations between speakers in the turn-taking aspects of conversation: the derivational history of personal relationships, stop-action pseudo-history versus dynamic compacted posing, and the criss-crossing of verbal versus kinetic axes. (Available from Semiotica, Co-Libri, P.O.…

  9. Investing in Training and Development. Turning Interest into Capital.

    ERIC Educational Resources Information Center

    Pont, Tony

    This book, which is intended for individuals responsible for human resource development (HRD) programs, examines a number of issues in turning investments in training and development into human capital and examines ways of making the workplace an arena for development. The following topics are discussed: the nature and role of training and…

  10. The Aesthetic Turn and the Rhetorical Perspective on Argumentation.

    ERIC Educational Resources Information Center

    Greene, Ronald Walter

    1998-01-01

    Argues that Robert Scott's landmark 1967 essay sets in motion a constitutive model of rhetorical effectivity. States Scott's essay belongs to a disciplinary history that brings forth a central preoccupation with the ethical problematization of rhetorical practices from an aesthetic point of view. Discusses how this aesthetic turn transforms the…

  11. Project "Freestyle": Ad Hoc: Fast-Turn-Around Evaluation.

    ERIC Educational Resources Information Center

    Smith, Karen

    Project "Freestyle" involved the development of prototypical television materials and a comic book intended to combat sex-role stereotyping in career-related attitudes of nine to twelve-year-old children. At various times during the early developmental stages of "Freestyle" materials, "ad hoc fast-turn-around" formative evaluations were conducted.…

  12. Beyond 100 Tesla: Scientific experiments using single-turn coils

    NASA Astrophysics Data System (ADS)

    Portugall, Oliver; Solane, Pierre Yves; Plochocka, Paulina; Maude, Duncan K.; Nicholas, Robin J.

    2013-01-01

    Current opportunities and recent examples for research in magnetic fields well above 100 T using single-turn coils are discussed. After a general introduction into basic principles and technical constraints associated with the generation of Megagauss fields we discuss data obtained at the LNCMI Toulouse, where such fields are routinely used for scientific applications.

  13. The Roots of Turn-Taking in the Neonatal Period

    ERIC Educational Resources Information Center

    Dominguez, S.; Devouche, E.; Apter, G.; Gratier, M.

    2016-01-01

    Human newborns are cognitively and socially competent. Although they are sensitive to the presence of a social partner, little is known on the emergence of the ability to partake in social interaction. In this study we aimed to explore the roots of turn-taking in the neonatal period. We wished to highlight the way mothers' and newborns'…

  14. Student Wellbeing and the Therapeutic Turn in Education

    ERIC Educational Resources Information Center

    Wright, Katie

    2014-01-01

    This article considers current concerns with promoting student mental health and wellbeing against the backdrop of critiques of the "therapeutic turn" in education. It begins by situating accounts of "therapeutic education" within broader theorisation of therapeutic culture. In doing so, the importance of this work is…

  15. Numerical simulation of a turning alpine ski during recreational skiing.

    PubMed

    Hirano, Y; Tada, N

    1996-09-01

    While downhill snow skiing, recreational alpine skiers enjoy making turning motions with their skis. These motions are mainly induced by skidding, while turning by alpine ski racers is made by carving a trace in the snow. In the present study we treat the turning motions by recreational alpine skiers. This "skidding" turning motion is made possible by centripetal forces acting on the ski and skier dynamic motion systems, with these forces arising due to the skier placing the ski's longitudinal axis at an angle that is inclined away from the velocity vector and edging the ski into the snow. When snow is soft, the edged ski creates a snow impacting force, whereas a snow cutting force occurs when it is hard. Here, we calculate the former force using a three-dimensional water jet analogy, while the latter one using conventional metal cutting theory, after which the corresponding equations of motion for each system are derived and numerically solved. This methodology enables simulating the curvilinear and rotational motion of the ski and skier systems. Resultant simulations quantitatively show for the first time that the resultant radius of curvature of a ski track while downhill skiing is strongly dependent on the location of the ski boot on the ski's longitudinal axis and also on its side-cut (midlength taper). PMID:8883012

  16. Turn vs. Shape: Teachers Cope with Incompatible Perspectives on Angle

    ERIC Educational Resources Information Center

    Kontorovich, Igor'; Zazkis, Rina

    2016-01-01

    This study is concerned with tensions between the two different perspectives on the concept of angle: angle as a static shape and angle as a dynamic turn. The goal of the study is to explore how teachers cope with these tensions. We analyze scripts of 16 in-service secondary mathematics teachers, which feature a dialogue between a teacher and…

  17. CNC Turning Technician. A Competency-Based Instructional System.

    ERIC Educational Resources Information Center

    Sloan, Kelly; Hilley, Robert

    This competency-based curriculum guide for instructing students in using computer numerically controlled (CNC) turning machines is one of a series of instructional guides for the machinist field developed in Oklahoma. Although developed jointly with Baxter Technologies Corporation and oriented toward the Baxter Vo-Tec 2000 Future Builder CNC…

  18. Experimental design for single point diamond turning of silicon optics

    SciTech Connect

    Krulewich, D.A.

    1996-06-16

    The goal of these experiments is to determine optimum cutting factors for the machining of silicon optics. This report describes experimental design, a systematic method of selecting optimal settings for a limited set of experiments, and its use in the silcon-optics turning experiments. 1 fig., 11 tabs.

  19. Numerical simulation of a turning alpine ski during recreational skiing.

    PubMed

    Hirano, Y; Tada, N

    1996-09-01

    While downhill snow skiing, recreational alpine skiers enjoy making turning motions with their skis. These motions are mainly induced by skidding, while turning by alpine ski racers is made by carving a trace in the snow. In the present study we treat the turning motions by recreational alpine skiers. This "skidding" turning motion is made possible by centripetal forces acting on the ski and skier dynamic motion systems, with these forces arising due to the skier placing the ski's longitudinal axis at an angle that is inclined away from the velocity vector and edging the ski into the snow. When snow is soft, the edged ski creates a snow impacting force, whereas a snow cutting force occurs when it is hard. Here, we calculate the former force using a three-dimensional water jet analogy, while the latter one using conventional metal cutting theory, after which the corresponding equations of motion for each system are derived and numerically solved. This methodology enables simulating the curvilinear and rotational motion of the ski and skier systems. Resultant simulations quantitatively show for the first time that the resultant radius of curvature of a ski track while downhill skiing is strongly dependent on the location of the ski boot on the ski's longitudinal axis and also on its side-cut (midlength taper).

  20. Novel β-amyloid aggregation inhibitors possessing a turn mimic.

    PubMed

    Hamada, Yoshio; Miyamoto, Naoko; Kiso, Yoshiaki

    2015-04-01

    Amyloid β peptide, the main component of senile plaques found in the brain of Alzheimer disease (AD) patients, is a molecular target for AD therapeutic intervention. A number of potential AD therapeutics have been reported, including inhibitors of β-secretase, γ-secretase, and Aβ aggregation, and anti-amyloid agents, such as neprilysin, insulin degrading enzyme (IDE), and Aβ antibodies. Recently, we reported potent small-sized β-secretase (BACE1) inhibitors, which could serve as anti-AD drugs. However AD is a progressive disorder, where dementia symptoms gradually worsen over several decades, and therefore may require many years to get cured. One possible way to achieve a greater therapeutic effect is through simultaneous administration of multiple drugs, similar to those used in Highly Active Anti-Retroviral Therapy (HAART) used to treat AIDS. In order to overcome AD, we took a drug discovery approach to evaluate, novel β-amyloid aggregation inhibitors. Previously, we reported that a tong-type compound possessing a turn mimic as the inhibitor of HIV-1 protease dimerization. Oligomerized amyloid β peptides contain a turn structure within the molecule. Here, we designed and synthesized novel β-amyloid aggregation inhibitors with a turn-mimic template, based on the turn conformer of the oligomerized amyloid β peptides.

  1. Repeated Reading, Turn Taking, and Augmentative and Alternative Communication (AAC)

    ERIC Educational Resources Information Center

    Edmister, Evette; Wegner, Jane

    2015-01-01

    This single participant multiple baseline research design measured the effects of repeatedly reading narrative books to children who used voice output augmentative communication devices to communicate. The study sought to determine if there was a difference observed in the number of turns taken when reading stories repeatedly. Three girls ranging…

  2. Turning Points of the Spherical Pendulum and the Golden Ratio

    ERIC Educational Resources Information Center

    Essen, Hanno; Apazidis, Nicholas

    2009-01-01

    We study the turning point problem of a spherical pendulum. The special cases of the simple pendulum and the conical pendulum are noted. For simple initial conditions the solution to this problem involves the golden ratio, also called the golden section, or the golden number. This number often appears in mathematics where you least expect it. To…

  3. A Rhetoric of Turns: Signs and Symbols in Education

    ERIC Educational Resources Information Center

    Rutten, Kris; Soetaert, Ronald

    2014-01-01

    In our research and teaching we explore the value and the place of rhetoric in education. From a theoretical perspective we situate our work in different disciplines, inspired by major "turns": linguistic, cultural, anthropological/ethnographic, interpretive, semiotic, narrative, literary, rhetorical etc. In this article we engage in the…

  4. Marking the Turn: Obligation, Engagement, and Alienation in Group Discussions

    ERIC Educational Resources Information Center

    Gibson, David R.

    2010-01-01

    In group conversations, not speaking is the state of affairs experienced by most people most of the time; I refer to this as "conversational latency." Hypothesizing that conversational latency affects one's discursive options, I analyze the association between latency (operationalized as the number of turns that elapsed since the current speaker…

  5. TURN ABOUT: A Competency-Based Teacher Education Program.

    ERIC Educational Resources Information Center

    Western Washington Univ., Bellingham.

    The project "Turn About" was initiated at Western Washington State College and Everett (Washington) Public Schools, 1971-1972. The major objectives of the program were to enlarge the learning outcomes of elementary school children and improve competency-based undergraduate and graduate teacher education in a portal school. Program leadership…

  6. [Turning points in American psychiatry of the 20th century].

    PubMed

    Sabshin, M

    1990-09-01

    Sabshin describes three turning points in twentieth century American psychiatry. Following "the time of the Thirteen", the time of the founders of modern American psychiatry, the first turning point was marked by the rise of Meyerian psychobiology and had its peak impact during the second quarter of the twentieth century. In the post World War II years diverging therapeutic ideologies became dominant, including the important impact of psychoanalysis. But competing ideologies (e.g. in social and biological psychiatry) were of importance also. The most recent turning point was marked by the current surge of neuro-science and psychopharmacology along with empiricism and logical positivsm. It is predicted to peak in the middle of the current decade. Following the preceding demedicalization a remedicalization of psychiatry was the result. For the turn of the 21st century, as Sabshin predicts, a re-emergence of analogues of Meyerian psychobiology will take center stage, particularly concentrating on questions of coping and adaptability, on how the human being keeps himself healthy and sane during subsequent developmental stages as well as in the face of stressful life events. PMID:2262194

  7. The Turning and Evolution of the Recent Acceleration Universe

    NASA Astrophysics Data System (ADS)

    Zhang, Tianxi; Tan, A.

    2007-05-01

    The turning point and evolution characteristics of the universe are investigated through solving the Friedmann equation with a non-zero cosmological constant. Choosing the present-time Hubble constant, the radius of the present universe , and the density parameter in matter as three key parameters, we obtain the density parameter in dark energy, the cosmological constant, the mass of the universe, the turning point redshif, the age of the present universe, and the time-dependent expansion rate, velocity, radius, and acceleration parameter of the universe. It is shown that the turing point redshift is soly dependent of the density parameters in matter and dark energy. For the flat universe, it turned from past deceleration to recent acceleration when its size was 1/2 to 2/3 of the present size if the density parameter in matter is between 0.2 and 0.4. The expansion rate is very large at initial and decreases with time to approach the Hubble constant. The expansion velocity can be over the light speed in the early period, which decreases to the minimum at the turning point and then increases with time to approach the ratio of the present radius to the Hubble radius times the square root of the density parameter in dark energy. The solution of the time-dependent radius increases with time. The present time depends on the three key parameters. The universe with a larger present radius, smaller Hubble constant, or smaller density parameter in dark energy is elder. The universe with greater density parameter in dark energy accelerates faster recently. The open and closed universes can also be accelerated recently. The turning points and evolution characteristics among different types of the universe and different sets of key parameters are compared. This presentation will show the details, supported by NASA grant (NNG04GD59G).

  8. Radiographic and echocardiographic assessment of left atrial size in 100 cats with acute left-sided congestive heart failure.

    PubMed

    Schober, Karsten E; Wetli, Ellen; Drost, Wm Tod

    2014-01-01

    The aims of this study were to evaluate left atrial size in cats with acute left-sided congestive heart failure. We hypothesized that left atrial size as determined by thoracic radiography can be normal in cats with acute left-sided congestive heart failure. One hundred cats with acute left-sided congestive heart failure in which thoracic radiography and echocardiography were performed within 12 h were identified. Left atrial size was evaluated using right lateral and ventrodorsal radiographs. Measurements were compared to two-dimensional echocardiographic variables of left atrial size and left ventricular size. On echocardiography, left atrial enlargement was observed in 96% cats (subjective assessment) whereas maximum left atrial dimension was increased (>15.7 mm) in 93% cats. On radiographs left atrial enlargement (subjective assessment) was found in 48% (lateral view), 53% (ventrodorsal view), and 64% (any view) of cats whereas left atrial enlargement was absent in 36% of cats in both views. Agreement between both methods of left atrial size estimation was poor (Cohen's kappa 0.17). Receiver operating characteristic curve analysis identified a maximum echocardiographic left atrial dimension of approximately 20 mm as the best compromise (Youden index) between sensitivity and specificity in the prediction of radiographic left atrial enlargement. Left atrial enlargement as assessed by thoracic radiography may be absent in a clinically relevant number of cats with congestive heart failure. Therefore, normal left atrial size on thoracic radiographs does not rule out presence of left-sided congestive heart failure in cats with clinical signs of respiratory distress.

  9. Effect of rate-dependent left bundle branch block on global and regional left ventricular function

    SciTech Connect

    Bramlet, D.A.; Morris, K.G.; Coleman, R.E.; Albert, D.; Cobb, F.R.

    1983-05-01

    Seven subjects with rate-dependent left bundle branch block (RDLBBB) and 13 subjects with normal conduction (control group) underwent upright bicycle exercise radionuclide angiography to determine the effects of the development of RDLBBB on global and regional left ventricular function. Six of the seven subjects with RDLBBB had atypical chest pain syndromes; none had evidence of cardiac disease based on clinical examination and either normal cardiac catheterization or exercise thallium-201 scintigraphy. Radionuclide angiograms were recorded at rest and immediately before and after RDLBBB in the test group, and at rest and during intermediate and maximal exercise in the control group. The development of RDLBBB was associated with an abrupt decrease in left ventricular ejection fraction (LVEF) in six of seven patients (mean decrease 6 +/- 5%) and no overall increase in LVEF between rest and maximal exercise (65 +/- 9% and 65 +/- 12%, respectively). In contrast, LVEF in the control group was 62 +/- 8% at rest and increased to 72 +/- 8% at intermediate and 78 +/- 7% at maximal exercise. The onset of RDLBBB was associated with the development of asynchronous left ventricular contraction in each patient and hypokinesis in four of seven patients. All patients in the control group had normal wall motion at rest and exercise. These data indicate that the development of RDLBBB is associated with changes in global and regional ventricular function that may be confused with development of left ventricular ischemia during exercise.

  10. Left ventricular heart failure and pulmonary hypertension†

    PubMed Central

    Rosenkranz, Stephan; Gibbs, J. Simon R.; Wachter, Rolf; De Marco, Teresa; Vonk-Noordegraaf, Anton; Vachiéry, Jean-Luc

    2016-01-01

    In patients with left ventricular heart failure (HF), the development of pulmonary hypertension (PH) and right ventricular (RV) dysfunction are frequent and have important impact on disease progression, morbidity, and mortality, and therefore warrant clinical attention. Pulmonary hypertension related to left heart disease (LHD) by far represents the most common form of PH, accounting for 65–80% of cases. The proper distinction between pulmonary arterial hypertension and PH-LHD may be challenging, yet it has direct therapeutic consequences. Despite recent advances in the pathophysiological understanding and clinical assessment, and adjustments in the haemodynamic definitions and classification of PH-LHD, the haemodynamic interrelations in combined post- and pre-capillary PH are complex, definitions and prognostic significance of haemodynamic variables characterizing the degree of pre-capillary PH in LHD remain suboptimal, and there are currently no evidence-based recommendations for the management of PH-LHD. Here, we highlight the prevalence and significance of PH and RV dysfunction in patients with both HF with reduced ejection fraction (HFrEF) and HF with preserved ejection fraction (HFpEF), and provide insights into the complex pathophysiology of cardiopulmonary interaction in LHD, which may lead to the evolution from a ‘left ventricular phenotype’ to a ‘right ventricular phenotype’ across the natural history of HF. Furthermore, we propose to better define the individual phenotype of PH by integrating the clinical context, non-invasive assessment, and invasive haemodynamic variables in a structured diagnostic work-up. Finally, we challenge current definitions and diagnostic short falls, and discuss gaps in evidence, therapeutic options and the necessity for future developments in this context. PMID:26508169

  11. LEFT VENTRICULAR HYPERTROPHY AFTER HYPERTENSIVE PREGNANCY DISORDERS

    PubMed Central

    Scantlebury, Dawn C.; Kane, Garvan C.; Wiste, Heather J.; Bailey, Kent R.; Turner, Stephen T.; Arnett, Donna K.; Devereux, Richard B.; Mosley, Thomas H.; Hunt, Steven C.; Weder, Alan B.; Rodriguez, Beatriz; Boerwinkle, Eric; Weissgerber, Tracey L.; Garovic, Vesna D.

    2015-01-01

    Objective Cardiac changes of hypertensive pregnancy include left ventricular hypertrophy (LVH) and diastolic dysfunction. These are thought to regress postpartum. We hypothesized that women with a history of hypertensive pregnancy would have altered left ventricular (LV) geometry and function when compared to women with only normotensive pregnancies. Methods In this cohort study, we analyzed echocardiograms of 2637 women who participated in the Family Blood Pressure Program (FBPP). We compared LV mass and function in women with hypertensive pregnancy compared to those with normotensive pregnancies. Results Women were evaluated at a mean age of 56 years: 427 (16%) had at least one hypertensive pregnancy; 2210 (84%) had normotensive pregnancies. Compared to women with normotensive pregnancies, women with hypertensive pregnancy had a greater risk of LVH (OR: 1.42, 95% CI 1.01-1.99, p=0.05), after adjusting for age, race, research network of the FBPP, education, parity, BMI, hypertension and diabetes. When duration of hypertension was taken into account, this relationship was no longer significant (OR: 1.19, CI 0.08-1.78 p=0.38). Women with hypertensive pregnancies also had greater left atrial size and lower mitral E/A ratio after adjusting for demographic variables. The prevalence of systolic dysfunction was similar between the groups. Conclusions A history of hypertensive pregnancy is associated with LVH after adjusting for risk factors; this might be explained by longer duration of hypertension. This finding supports current guidelines recommending surveillance of women following a hypertensive pregnancy, and sets the stage for longitudinal echocardiographic studies to further elucidate progression of LV geometry and function after pregnancy. PMID:26243788

  12. Dynamic aortomyoplasty to assist left ventricular failure.

    PubMed

    Chachques, J C; Grandjean, P A; Cabrera Fischer, E I; Latremouille, C; Jebara, V A; Bourgeois, I; Carpentier, A

    1990-02-01

    The efficacy of skeletal muscle contractile force to augment left ventricular function has been demonstrated experimentally and clinically by the cardiomyoplasty procedure. Another approach in biomechanical cardiac assistance is the use of electrostimulated skeletal muscle in an extracardiac position. We describe an autologous counterpulsating device using the native ascending aorta as a ventricular chamber wrapped by an electrostimulated latissimus dorsi muscle flap (LDMF). This model avoids thrombotic complications observed in skeletal muscle neo-ventricles associated with prosthetic chambers. In 8 goats, a right LDMF was transferred to the thoracic cavity by removal of the second rib. In 4 goats, the diameter of the aorta was enlarged by surgical implantation (using lateral clamping) of an autologous pericardial patch. The LDMF was wrapped around the ascending aorta and electrostimulated using an external diastolic pulse generator connected to a sensing myocardial lead and to LDMF pacing electrodes. Hemodynamic studies were performed (left ventricular, aortic, and pulmonary artery pressures and rate of rise of left ventricular pressure). The LDMF diastolic counterpulsation was performed using a burst of 30 Hz, with a delay from the R wave adjusted to provide optimal diastolic augmentation. Percent increase in the subendocardial viability index was calculated during unassisted and assisted cardiac cycles (1:2) at baseline and after acute heart failure induced by the administration of high doses of propranolol hydrochloride (3 mg/kg intravenously). Diastolic aortic counterpulsation by the stimulated LDMF resulted in a significant improvement in the subendocardial viability index both at baseline and after induced cardiac failure in both groups, though the increase was greater in the group with aortic enlargement.

  13. Photonic-resonant left-handed medium

    NASA Astrophysics Data System (ADS)

    Shen, Jian Qi

    2006-08-01

    A new scheme to realize simultaneously negative permittivity and permeability in a coherent atomic vapor medium (photonic-resonant material) via a coherent driving mechanism is suggested. It is verified that the atomic system coherently driven by a strong optical field will give rise to a negative refractive index in certain probe frequency ranges. One of the most remarkable features of the present scheme is such that a slab fabricated by the left-handed vapor medium is an ideal candidate for designing perfect lenses since the photonic-resonant atomic vapor cannot only exhibit an isotropic negative refractive index, but also provide a good impedance match at the air-medium interfaces.

  14. Left ventricular assist device management and complications.

    PubMed

    Birati, Edo Y; Rame, J Eduardo

    2014-07-01

    Patients on long-term left ventricular assist device (LVAD) support present unique challenges in the intensive care unit. It is crucial to know the status of end-organ perfusion, which may require invasive hemodynamic monitoring with a systemic arterial and pulmonary artery catheter. Depending on the indication for LVAD support (bridge to decision or cardiac transplantation vs destination therapy), it is important to readdress goals of care with the patient (if possible) and their family after major events have occurred that challenge the survival of the patient. PMID:24996611

  15. Hypoplastic left heart syndrome: current perspectives

    PubMed Central

    Greenleaf, Christopher E.; Urencio, J. Miguel; Salazar, Jorge D.

    2016-01-01

    Since the first successful intervention for hypoplastic left heart syndrome (HLHS) was undertaken by Norwood in 1983, there have been many advancements in the pre-, intra-, and postoperative care of these children for a diagnosis that just 25 years ago was almost certainly a fatal one. This paper aims to describe the most recent trends and perspectives on the treatment of HLHS. In particular, we will discuss the five current options for HLHS, including Norwood stage I as the beginning to 3-stage palliation, transplant, true hybrid, hybrid-bridge-to-Norwood, and compassionate care. PMID:27709095

  16. BOILING HOUSE, INTERIOR, SECOND FLOOR, CLARIFIERS, SIEP TO THE LEFT, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    BOILING HOUSE, INTERIOR, SECOND FLOOR, CLARIFIERS, SIEP TO THE LEFT, WITH CLARIFIER FLASH TANK ABOVE, SAMPLING STATION TO THE LEFT. VIEW FROM THE SOUTHEAST - Kekaha Sugar Company, Sugar Mill Building, 8315 Kekaha Road, Kekaha, Kauai County, HI

  17. EAST WALL OF CRYSTALLIZER WING TO THE LEFT, END WALL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    EAST WALL OF CRYSTALLIZER WING TO THE LEFT, END WALL OF CRUSHING MILL IN CENTER. GABLE END OF BOILING HOUSE IN LEFT BACKGROUND. VIEW FROM THE SOUTH - Kekaha Sugar Company, Sugar Mill Building, 8315 Kekaha Road, Kekaha, Kauai County, HI

  18. OVERALL VIEW OF THE MILL WITH SUGAR BIN LEFT OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    OVERALL VIEW OF THE MILL WITH SUGAR BIN LEFT OF CENTER, CLEANING PLANT TO RIGHT, SEED TREATMENT PLANT TO LEFT. VIEW FROM THE EAST - Kekaha Sugar Company, Sugar Mill Building, 8315 Kekaha Road, Kekaha, Kauai County, HI

  19. 13. DETAIL VIEW NORTHEAST OF BOILER VENTS (LOWER LEFT), BREECHING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    13. DETAIL VIEW NORTHEAST OF BOILER VENTS (LOWER LEFT), BREECHING (CENTER LEFT AND CENTER), AND COAL BUNKERS (RIGHT) - Turners Falls Power & Electric Company, Hampden Station, East bank of Connecticut River, Chicopee, Hampden County, MA

  20. 11. ANSELMO HEADFRAME LOOKING NORTHWEST. THE DEBRIS ON THE LEFT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. ANSELMO HEADFRAME LOOKING NORTHWEST. THE DEBRIS ON THE LEFT IS WHAT REMAINS OF THE SLIME PLANT. THE ORE SORTER IS TO THE LEFT OF THE HEADFRAME, WITH TRACKS BENEATH - Butte Mineyards, Anselmo Mine, Butte, Silver Bow County, MT

  1. 1. GENERAL VIEW OF LAUNDRY BUILDING (left). The structure at ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. GENERAL VIEW OF LAUNDRY BUILDING (left). The structure at left is the Richard Capers Kitchen and Slave Building, HABS No. SC-215 A. - Richard Capers Laundry Building, 69 Church Street, Charleston, Charleston County, SC

  2. 10. GENERAL VIEW FROM SOUTH WEST. CHIPPER AT LEFT, STEAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. GENERAL VIEW FROM SOUTH WEST. CHIPPER AT LEFT, STEAM PLANT AT RIGHT. NOTE STEAM EXHAUSTS IN ROOF; LEFT IS MAIN ENGINE, RIGHT IS CARRIAGE DRIVE ENGINE. - Hull-Oakes Lumber Company, 23837 Dawson Road, Monroe, Benton County, OR

  3. 10. UPSTREAM SIDE OF UPPER MITER GATES SHOWING STOWED LEFT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. UPSTREAM SIDE OF UPPER MITER GATES SHOWING STOWED LEFT WING OF UPPER GUARD GATE (FAR LEFT). VIEW TO NORTHWEST. - Starved Rock Locks & Dam, Illinois Waterway River mile 231, Peru, La Salle County, IL

  4. EAST ELEVATION, TOWER, SECOND STAGE, LEFT. Glass plate stereopair number ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    EAST ELEVATION, TOWER, SECOND STAGE, LEFT. Glass plate stereopair number PA-1430-139 LC-HABS-GS05-ET-8 157.4635. Left (printed) - Independence Hall Complex, Independence Hall, 500 Chestnut Street, Philadelphia, Philadelphia County, PA

  5. [Initial division of the left renal vein before dissection of left renal vein occluded by intracaval tumor thrombus].

    PubMed

    Kurosawa, Kazuhiro; Okita, Ryuji; Motoshima, Takanobu; Fujioka, Masashi; Abe, Hiromitsu; Morikawa, Hirofumi; Okaneya, Toshikazu; Komatsu, Hideki

    2011-09-01

    Between November 2008 and March 2010, we performed initial division of the left renal vein occluded by the tumor thrombus in six cases of left renal cancer at Toranomon Hospital. The left renal vein was completely occluded by the tumor thrombus in all cases. In order to ligate the left renal artery first behind the dilated left renal vein, we must dissect the left kidney with arterial blood flow. Massive bleeding from the numerous engorged collateral veins around the left kidney is inevitable. Furthermore, access to the left renal artery is difficult because of the large tumor. We therefore initially divided the left renal vein without arterial blood flow followed by division of the left renal artery. After nephrectomy by dissecting the tumor without blood flow we extirpated the intracaval tumor thrombus. The median time of the operation was 7 hours 35 minutes and the median amount of blood loss was 2,869 ml. The tumor stage was pT3b in four cases and pT3c in two cases. No complications were observed during and after surgery except for one case of lymphocele and another case of chylous ascites. The initial division of the left renal vein is considered to be a useful surgical approach in left renal cancer with occluded left renal vein, especially when the tumor is large.

  6. Aorto-left atrial tunnel: a rare entity.

    PubMed

    Paul, Sajiv K; Gajjar, Trushar P; Desai, Neelam B

    2013-05-01

    Aorto-left atrial tunnel (ALAT) is a vascular channel that originates from 1 of the sinuses of Valsalva and terminates in the left atrium. The aorto-left atrial tunnel is an extremely rare anomaly. We describe here a case of congenital aorto-left atrial tunnel in a 4-year-old child who underwent successful surgical ligation with good immediate and early results.

  7. Aorto-left atrial tunnel: a rare entity.

    PubMed

    Paul, Sajiv K; Gajjar, Trushar P; Desai, Neelam B

    2013-05-01

    Aorto-left atrial tunnel (ALAT) is a vascular channel that originates from 1 of the sinuses of Valsalva and terminates in the left atrium. The aorto-left atrial tunnel is an extremely rare anomaly. We describe here a case of congenital aorto-left atrial tunnel in a 4-year-old child who underwent successful surgical ligation with good immediate and early results. PMID:23608293

  8. Hemispheric asymmetries of visual ERPs in left-handed bilinguals.

    PubMed

    Andreou, G; Karapetsas, A

    2001-10-01

    ERPs (N1, P1, N2, P2) obtained from left and right occipital and temporal lobes were elicited in 30 left-handed highly proficient bilingual males in response to visually presented linguistic stimuli. The absence of statistically significant(P = < or =0.05) differences between left and right occipital and temporal lobes in all the components of the waveforms obtained, indicates a bilateral pattern of lateralization in left-handed males for both their native and foreign language.

  9. Austria in U-turn over CERN pull-out

    NASA Astrophysics Data System (ADS)

    Banks, Michael

    2009-06-01

    Austria will not be withdrawing as a member of the CERN particle-physics laboratory after its chancellor Werner Faymann overruled a decision taken by the country's science minister last month to quit the lab. Researchers in Austria were left shocked when Johannes Hahn unexpectedly announced on 8 May that the country would cut its funding for CERN, worth about €20m per year. Austria - one of the co-founders of CERN - will now remain a full member of the lab.

  10. The right wing of the LEFT airplane

    NASA Technical Reports Server (NTRS)

    Powell, Arthur G.

    1987-01-01

    The NASA Leading-Edge Flight Test (LEFT) program addressed the environmental issues which were potential problems in the application of Laminar Flow Control (LFC) to transport aircraft. These included contamination of the LFC surface due to dirt, rain, insect remains, snow, and ice, in the critical leading-edge region. Douglas Aircraft Company designed and built a test article which was mounted on the right wing of the C-140 JetStar aircraft. The test article featured a retractable leading-edge high-lift shield for contamination protection and suction through perforations on the upper surface for LFC. Following a period of developmental flight testing, the aircraft entered simulated airline service, which included exposure to airborne insects, heavy rain, snow, and icing conditions both in the air and on the ground. During the roughly 3 years of flight testing, the test article has consistently demonstrated laminar flow in cruising flight. The experience with the LEFT experiment was summarized with emphasis on significant test findings. The following items were discussed: test article design and features; suction distribution; instrumentation and transition point reckoning; problems and fixes; system performance and maintenance requirements.

  11. UFO in the Left Atrium: How to Capture Metal Debris Floating in the Left Atrium.

    PubMed

    Fassini, Gaetano; Moltrasio, Massimo; Conti, Sergio; Biagioli, Viviana; Tondo, Claudio

    2016-06-01

    Electrophysiology procedures involving left atrium navigation are becoming more frequent, mostly due to the increase of atrial fibrillation ablation. Mapping catheters of different shapes and size as well as dedicated sheaths are mandatory tools for the accomplishment of procedural end point. Therefore, technical issues are expected, usually unrelated to significant risk. However, any accidental intra-atrial device loss of integrity implies a risk of cerebrovascular embolization. The lack of clear evidence on how to manage these events and the need for a quick solution complicate the scenario. We report an empirical solution in the case of debris floating in the left atrium. PMID:26395524

  12. Left ventricular thrombus formation after repair of anomalous left coronary artery from the pulmonary artery.

    PubMed

    Freud, Lindsay R; Koenig, Peter R; Russell, Hyde M; Patel, Angira

    2014-04-01

    Although thrombus formation following myocardial infarction in adults is well known, intracardiac thrombosis in children is uncommon. We report the case of a large left ventricular thrombus in an infant with ischemic cardiomyopathy secondary to anomalous origin of the left coronary artery from the pulmonary artery. Given its mobility and protrusion across the aortic valve, the patient underwent urgent thrombus removal through a transaortic approach. There were no embolic or neurologic complications. This case highlights that thrombectomy may be performed safely and successfully in critically ill pediatric patients.

  13. UFO in the Left Atrium: How to Capture Metal Debris Floating in the Left Atrium.

    PubMed

    Fassini, Gaetano; Moltrasio, Massimo; Conti, Sergio; Biagioli, Viviana; Tondo, Claudio

    2016-06-01

    Electrophysiology procedures involving left atrium navigation are becoming more frequent, mostly due to the increase of atrial fibrillation ablation. Mapping catheters of different shapes and size as well as dedicated sheaths are mandatory tools for the accomplishment of procedural end point. Therefore, technical issues are expected, usually unrelated to significant risk. However, any accidental intra-atrial device loss of integrity implies a risk of cerebrovascular embolization. The lack of clear evidence on how to manage these events and the need for a quick solution complicate the scenario. We report an empirical solution in the case of debris floating in the left atrium.

  14. Turning the Tide Against Aids | NIH MedlinePlus the Magazine

    MedlinePlus

    ... turn Javascript on. Feature: Turning the Tide Against AIDS Turning the Tide Against AIDS Past Issues / Fall 2012 Table of Contents A ... What is the current state of the HIV/AIDS epidemic? Globally, more than 34 million people are ...

  15. 3. Aerial view southeast, State Route 92 bottom left, Adams ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Aerial view southeast, State Route 92 bottom left, Adams Dam Road center, Brandywine Creek State Park and J. Chandler Farm in center left, duck pond bottom right and reservoir bottom left. - Winterthur Farms, Intersection State Routes 92 & 100, Intersection State Routes 92 & 100, Winterthur, New Castle County, DE

  16. 4. Log chicken house (far left foreground), log bunkhouse (far ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Log chicken house (far left foreground), log bunkhouse (far left background), one-room log cabin (left of center background), log root cellar (center), post-and-beam center in foreground, and blacksmith shop (far right foreground). View to southeast. - William & Lucina Bowe Ranch, County Road 44, 0.1 mile northeast of Big Hole River Bridge, Melrose, Silver Bow County, MT

  17. [Isolated left ventricular noncompaction causing refractory heart failure].

    PubMed

    Meneguz-Moreno, Rafael Alexandre; Rodrigues da Costa Teixeira, Felipe; Rossi Neto, João Manoel; Finger, Marco Aurélio; Casadei, Carolina; Castillo, Maria Teresa; Sanchez de Almeida, Antonio Flávio

    2016-03-01

    Left ventricular noncompaction is a rare congenital anomaly characterized by excessive left ventricular trabeculation, deep intertrabecular recesses and a thin compacted layer due to the arrest of compaction of myocardial fibers during embryonic development. We report the case of a young patient with isolated left ventricular noncompaction, leading to refractory heart failure that required extracorporeal membrane oxygenation followed by emergency heart transplantation. PMID:26928017

  18. Left-Handed Students: A Forgotten Minority. Fastback 399.

    ERIC Educational Resources Information Center

    Kelly, Evelyn B.

    This fastback, a booklet bound "left-handed," is designed to help educators become aware of the problems faced by left-handed students in school and to suggest ways that many of the problems might be solved. Following an introduction discussing a personal experience with left-handedness, the booklet continues with a brief history of the treatment…

  19. Spatial Deficit in Familial Left-Handed Children.

    ERIC Educational Resources Information Center

    And Others; Eme, Robert

    1978-01-01

    The study evaluated the hypothesis that familial left-handed children, who presumably have bilateral representation of language ability, should show an impairment in spatial abiblity on 44 children (22 right handed, 11 familial left handed, and 11 nonfamilial left handed) whose average age was 8 years old. (Author/PHR)

  20. Left-Handed Children--Are They Losing Out?

    ERIC Educational Resources Information Center

    Milsom, Lauren

    1995-01-01

    Discusses difficulties faced by left-handed children in everyday schoolwork. Highlights include right-handed bias of toys, clothing, and tools; the need for guidance in handwriting; problem areas including domestic science, arts and crafts, and metal and woodwork; left-hand advantages in sports and creative arts; and the European Left-Handers Club…

  1. Learning Conflict Among Mixed-Dominance Left-Handed Individuals.

    ERIC Educational Resources Information Center

    Blai, Boris, Jr.

    This study investigates the hypothesis that it is mixed-dominance among left handers (i.e. left handedness and right eye and/or foot dominance), that is related to academic learning difficulties among such individuals, rather than the generally held notion that their difficulties stem from the fact that they are left handers in a "right handed…

  2. 1. Context view includes Building 59 (second from left). Camera ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Context view includes Building 59 (second from left). Camera is pointed ENE along Farragut Aveune. Buildings on left side of street are, from left: Building 856, Building 59 and Building 107. On right side of street they are, from right; Building 38, Building 452 and Building 460. - Puget Sound Naval Shipyard, Pattern Shop, Farragut Avenue, Bremerton, Kitsap County, WA

  3. Fluid dynamics of forward swimming and turning for jellyfish

    NASA Astrophysics Data System (ADS)

    Miller, Laura

    2012-11-01

    Jellyfish propel themselves through the water through periodic contractions of their elastic bells. Some jellyfish, such as the box jellyfish Tripedalia cystophora and the upside down jellyfish Cassiopea xamachana, can perform turns via asymmetric contractions of the bell and by generating asymmetries in the outflow opening of the bell. The fluid dynamics of jellyfish forward propulsion and turning is explored here using the immersed boundary method. The 2D and 3D Navier-Stokes equations are coupled to the motion of a simplified jellyfish represented by an elastic boundary. An adaptive and parallelized version of the immersed boundary method (IBAMR) is used to resolve the detailed structure of the vortex wake. The asymmetric contraction and structure of the jellyfish generates asymmetries in the starting and stopping vortices. This creates a diagonal jet and a net torque acting on the jellyfish.

  4. A Turn-Projected State-Based Conflict Resolution Algorithm

    NASA Technical Reports Server (NTRS)

    Butler, Ricky W.; Lewis, Timothy A.

    2013-01-01

    State-based conflict detection and resolution (CD&R) algorithms detect conflicts and resolve them on the basis on current state information without the use of additional intent information from aircraft flight plans. Therefore, the prediction of the trajectory of aircraft is based solely upon the position and velocity vectors of the traffic aircraft. Most CD&R algorithms project the traffic state using only the current state vectors. However, the past state vectors can be used to make a better prediction of the future trajectory of the traffic aircraft. This paper explores the idea of using past state vectors to detect traffic turns and resolve conflicts caused by these turns using a non-linear projection of the traffic state. A new algorithm based on this idea is presented and validated using a fast-time simulator developed for this study.

  5. The spatial turn: geographical approaches in the history of science.

    PubMed

    Finnegan, Diarmid A

    2008-01-01

    Over the past decade or so a number of historians of science and historical geographers, alert to the situated nature of scientific knowledge production and reception and to the migratory patterns of science on the move, have called for more explicit treatment of the geographies of past scientific knowledge. Closely linked to work in the sociology of scientific knowledge and science studies and connected with a heightened interest in spatiality evident across the humanities and social sciences this 'spatial turn' has informed a wide-ranging body of work on the history of science. This discussion essay revisits some of the theoretical props supporting this turn to space and provides a number of worked examples from the history of the life sciences that demonstrate the different ways in which the spaces of science have been comprehended.

  6. Birds and dolphins flock to turn basin in feeding frenzy.

    NASA Technical Reports Server (NTRS)

    2000-01-01

    Hundreds of birds, especially gray and white pelicans and cormorants, cover the water in the turn basin, located east of the Vehicle Assembly Building and next to the crawlerway. The basin is teeming with fish, attracting the crowd for a meal. The turn basin is part of the Indian River Lagoon, composed of Mosquito Lagoon to the north, Banana River and Creek to the south and the Indian River to the west. The lagoon has one of the most diverse bird populations anywhere in America, plus many different species of oceanic and lagoon fish, shellfish and dolphins. Also, nearly one-third of the nation's manatee population lives here or migrates through the Lagoon seasonally. The Lagoon varies in width from .5 mile to 5 miles and averages only 3 feet in depth..

  7. Birds and dolphins flock to turn basin in feeding frenzy.

    NASA Technical Reports Server (NTRS)

    2000-01-01

    A gray and a white pelican glide down to the water near a dolphin and cormorant in the turn basin to search for a meal in the fish- teeming water. Sea gulls also approach. The turn basin, which is east of the Vehicle Assembly Building and next to the crawlerway, is part of the Indian River Lagoon, composed of Mosquito Lagoon to the north, Banana River and Creek to the south and the Indian River to the west. The lagoon has one of the most diverse bird populations anywhere in America, plus many different species of oceanic and lagoon fish, shellfish and dolphins. Also, nearly one-third of the nation's manatee population lives here or migrates through the Lagoon seasonally. The Lagoon varies in width from .5 mile to 5 miles and averages only 3 feet in depth..

  8. Birds and dolphins flock to turn basin in feeding frenzy.

    NASA Technical Reports Server (NTRS)

    2000-01-01

    The water in the turn basin, east of the Vehicle Assembly Building and next to the crawlerway, teems with fish and draws white pelicans, gray pelicans, cormorants, sea gulls and more looking for a meal. The turn basin is part of the Indian River Lagoon, composed of Mosquito Lagoon to the north, Banana River and Creek to the south and the Indian River to the west. The Indian River Lagoon has one of the most diverse bird populations anywhere in America. Also, nearly one-third of the nation's manatee population lives here or migrates through the lagoon seasonally. The lagoon varies in width from .5 mile to 5 miles and averages only 3 feet in depth.

  9. Birds and dolphins flock to turn basin in feeding frenzy.

    NASA Technical Reports Server (NTRS)

    2000-01-01

    The water in the turn basin, located east of the Vehicle Assembly Building and next to the crawlerway, teems with fish and draws white pelicans, gray pelicans, cormorants, sea gulls and one of several dolphins looking for a meal. The turn basin is part of the Indian River Lagoon, composed of Mosquito Lagoon to the north, Banana River and Creek to the south and the Indian River to the west. The lagoon has one of the most diverse bird populations anywhere in America, plus many different species of oceanic and lagoon fish, shellfish and dolphins. Also, nearly one-third of the nation's manatee population lives here or migrates through the lagoon seasonally. The lagoon varies in width from .5 mile to 5 miles and averages only 3 feet in depth.

  10. Turning points in twentieth-century American psychiatry.

    PubMed

    Sabshin, M

    1990-10-01

    The author examines four major turning points in twentieth-century American psychiatry, emphasizing the movement during the post-World War II period toward a psychotherapeutic/psychoanalytic approach and the emergence of biological psychiatry, neuroscience, and logical positivism during the 1970s and 1980s. He discusses the impact of Adolf Meyer during the mid-twentieth century and his ongoing influence. The final turning point involves a prediction of a late twentieth-century change, including new directions in nosology, emphasis on combined pharmacotherapeutic/psychotherapeutic treatments, efforts to create alternatives to full inpatient care, better outcome data for psychiatric treatments, and beginning resolution of major boundary problems of current practice. PMID:2205113

  11. Design and synthesis of a protein. beta. -turn mimetic

    SciTech Connect

    Olson, G.L.; Voss, M.E.; Hill, D.E.; Kahn, M.; Madison, V.S.; Cook, C.M. )

    1990-01-03

    A nine-membered-ring lactam system (1) has been chosen as a framework for the development of non-peptide molecules to mimic structural features of peptide and protein {beta}-turns. The synthesis of model di- and tetrapeptide mimetics starting from 1,5-cyclooctadiene derivatives is reported. In the model dipeptide mimetic (9), the amide linkages is trans (NMR, X-ray) and functional groups at positions adjacent to the lactam amide bond correspond closely to the side-chain positions of residues i + 1 and i + 2 of classical type II{prime} {beta}-turns. In the model tetrapeptide mimetic (30), all four side chains of low-energy trans amide conformers of the mimetic are well matched to their peptide counterparts.

  12. Memory boosts turn taking in evolutionary dilemma games.

    PubMed

    Wang, Tao; Chen, Zhigang; Yang, Lei; Zou, You; Luo, Juan

    2015-05-01

    Spontaneous turn taking phenomenon can be observed in many self-organized systems, and the mechanism is unclear. This paper tries to model it by evolutionary dilemma games with memory mechanism. Prisoner's dilemma, Snowdrift (including Leader and Hero) and Stag-hunt games are unified on an extended S-T plane. Agents play game with all the others and make decision by the last game histories. The experiments find that when agents remember last 2-step histories or more, a kind of cooperative turn taking (CAD) bursts at the area of Snowdrift game with restriction of S + T > 2R and S ≠ T, while the consistent strategy (DorC) gathers on the line of S + T > 2R and S = T. We also find that the system's fitness ratio greatly improved with 2-step memory. PMID:25841617

  13. Nonstereogenic alpha-aminoisobutyryl-glycyl dipeptidyl unit nucleates type I' beta-turn in linear peptides in aqueous solution.

    PubMed

    Masterson, Larry R; Etienne, Marcus A; Porcelli, Fernando; Barany, George; Hammer, Robert P; Veglia, Gianluigi

    2007-01-01

    The use of alpha,alpha-disubstituted amino acids represents a valuable strategy to exercise conformational control in peptides. Incorporation of the nonstereogenic alpha-aminoisobutyryl-glycyl (Aib-Gly) dipeptidyl sequence into i+1 and i+2 positions of an acyclic peptide sequence, originally designed and investigated by Gellman and coworkers, [H-Arg-Tyr-Val-Glu-Val-Yyy-Xxx-Orn-Lys-Ile-Leu-Gln-NH2] nucleates a stable [2:4] left-handed type I' beta-turn in water. NMR spectra show that this newly designed beta-hairpin does not aggregate in water up to a concentration of approximately 1 mM, and that its backbone conformation is superimposable on corresponding hairpins containing the DPro-Gly (literature) and Aib-DAla (this work) sequences. The Aib-Gly turn-inducer sequence eliminates complications because of cis-trans isomerization of Zzz-Pro bonds, and constitutes an attractive alternative to the proteogenic Asn-Gly and nonproteogenic DPro-Gly motifs previously suggested as turn-inducer sequences. These design principles could be exploited to prepare water-soluble beta-hairpin peptides with robust structures and novel function. PMID:17427180

  14. Nonstereogenic alpha-aminoisobutyryl-glycyl dipeptidyl unit nucleates type I' beta-turn in linear peptides in aqueous solution.

    PubMed

    Masterson, Larry R; Etienne, Marcus A; Porcelli, Fernando; Barany, George; Hammer, Robert P; Veglia, Gianluigi

    2007-01-01

    The use of alpha,alpha-disubstituted amino acids represents a valuable strategy to exercise conformational control in peptides. Incorporation of the nonstereogenic alpha-aminoisobutyryl-glycyl (Aib-Gly) dipeptidyl sequence into i+1 and i+2 positions of an acyclic peptide sequence, originally designed and investigated by Gellman and coworkers, [H-Arg-Tyr-Val-Glu-Val-Yyy-Xxx-Orn-Lys-Ile-Leu-Gln-NH2] nucleates a stable [2:4] left-handed type I' beta-turn in water. NMR spectra show that this newly designed beta-hairpin does not aggregate in water up to a concentration of approximately 1 mM, and that its backbone conformation is superimposable on corresponding hairpins containing the DPro-Gly (literature) and Aib-DAla (this work) sequences. The Aib-Gly turn-inducer sequence eliminates complications because of cis-trans isomerization of Zzz-Pro bonds, and constitutes an attractive alternative to the proteogenic Asn-Gly and nonproteogenic DPro-Gly motifs previously suggested as turn-inducer sequences. These design principles could be exploited to prepare water-soluble beta-hairpin peptides with robust structures and novel function.

  15. Analysis of the influence of tool dynamics in diamond turning

    SciTech Connect

    Fawcett, S.C.; Luttrell, D.E.; Keltie, R.F.

    1988-12-01

    This report describes the progress in defining the role of machine and interface dynamics on the surface finish in diamond turning. It contains a review of literature from conventional and diamond machining processes relating tool dynamics, material interactions and tool wear to surface finish. Data from experimental measurements of tool/work piece interface dynamics are presented as well as machine dynamics for the DTM at the Center.

  16. Diamond turning in the production of x ray optics

    NASA Technical Reports Server (NTRS)

    Fawcett, Steven C.

    1994-01-01

    A demonstration x-ray optic has been produced by diamond turning and replication techniques that could revolutionize the fabrication of advanced mirror assemblies. The prototype optic was developed as part of the Advanced X-ray Astrophysics Facility - Spectrographic project (AXAF-S). The initial part of the project was aimed at developing and testing the replica technique so that it could potentially be used for the production of the entire mirror array comprised of up to 50 individual mirror shells.

  17. Turned head--adducted hip--truncal curvature syndrome.

    PubMed Central

    Hamanishi, C; Tanaka, S

    1994-01-01

    One hundred and eight neonates and infants who showed the clinical triad of a head turned to one side, adduction contracture of the hip joint on the occipital side of the turned head, and truncal curvature, which we named TAC syndrome, were studied. These cases included seven with congenital and five with late infantile dislocations of the hip joint and 14 who developed muscular torticollis. Forty one were among 7103 neonates examined by one of the authors. An epidemiological analysis confirmed the aetiology of the syndrome to be environmental. The side to which the head was turned and that of the adducted hip contracture showed a high correlation with the side of the maternal spine on which the fetus had been lying. TAC syndrome is an important asymmetrical deformity that should be kept in mind during neonatal examination, and may be aetiologically related to the unilateral dislocation of the hip joint, torticollis, and infantile scoliosis which develop after a vertex presentation. Images PMID:8048823

  18. Body saccades of Drosophila consist of stereotyped banked turns.

    PubMed

    Muijres, Florian T; Elzinga, Michael J; Iwasaki, Nicole A; Dickinson, Michael H

    2015-03-01

    The flight pattern of many fly species consists of straight flight segments interspersed with rapid turns called body saccades, a strategy that is thought to minimize motion blur. We analyzed the body saccades of fruit flies (Drosophila hydei), using high-speed 3D videography to track body and wing kinematics and a dynamically scaled robot to study the production of aerodynamic forces and moments. Although the size, degree and speed of the saccades vary, the dynamics of the maneuver are remarkably stereotypic. In executing a body saccade, flies perform a quick roll and counter-roll, combined with a slower unidirectional rotation around their yaw axis. Flies regulate the size of the turn by adjusting the magnitude of torque that they produce about these control axes, while maintaining the orientation of the rotational axes in the body frame constant. In this way, body saccades are different from escape responses in the same species, in which the roll and pitch component of banking is varied to adjust turn angle. Our analysis of the wing kinematics and aerodynamics showed that flies control aerodynamic torques during the saccade primarily by adjusting the timing and amount of span-wise wing rotation.

  19. Turns-amplitude analysis in normal and myopathic facial muscles.

    PubMed

    Karandreas, Nikos; Kararizou, Evangelia; Papagianni, Aikaterini; Zambelis, Thomas; Kokotis, Panagiotis

    2011-03-01

    The purpose of this study was to assess turns/amplitude analysis (TAA) as an objective alternative to conventional qualitative electromyography (EMG) for detection of myopathy in facial muscles. Normal values of TAA parameters were calculated in the frontalis and mentalis muscles of 26 control subjects. We estimated the slope of the regression line of mean amplitude/turn values (MA) plotted against the number of turns/second (NT) and the resulting clouds. The 95% confidence limits of the cloud data were drawn as an ellipse. The sensitivity of TAA was determined from a group of 35 myopathic patients and specificity from a second group of 25 control subjects. Significant differences for every TAA parameter were found between frontalis and mentalis. Cumulative sensitivity and specificity of TAA for frontalis and mentalis were 74.6%, 56.5%, and 73.3%, 70.8%, respectively. With at least two of the aforementioned criteria abnormal, the sensitivity and specificity for frontalis and mentalis were 61.3%, 82.6%, and 56.7%, 100.0%, respectively.

  20. Turning Rate Dynamics of Zebrafish Exposed to Ethanol

    NASA Astrophysics Data System (ADS)

    Mwaffo, Violet; Porfiri, Maurizio

    2015-06-01

    Zebrafish is emerging as a species of choice in alcohol-related pharmacological studies. In these studies, zebrafish are often exposed to acute ethanol treatments and their activity scored during behavioral assays. Computational modeling of zebrafish behavior is expected to positively impact these efforts by offering a predictive toolbox to plan hypothesis-driven studies, reduce the number of subjects, perform pilot trials, and refine behavioral screening. In this work, we demonstrate the use of the recently proposed jump persistent turning walker to model the turning rate dynamics of zebrafish exposed to acute ethanol administration. This modeling framework is based on a stochastic mean reverting jump process to capture the sudden and large changes in orientation of swimming zebrafish. The model is calibrated on an available experimental dataset of 40 subjects, tested at different ethanol concentrations. We demonstrate that model parameters are modulated by ethanol administration, whereby both the relaxation rate and jump frequency of the turning rate dynamics are influenced by ethanol concentration. This effort offers a first evidence for the possibility of complementing zebrafish pharmacological research with computational modeling of animal behavior.

  1. Body saccades of Drosophila consist of stereotyped banked turns.

    PubMed

    Muijres, Florian T; Elzinga, Michael J; Iwasaki, Nicole A; Dickinson, Michael H

    2015-03-01

    The flight pattern of many fly species consists of straight flight segments interspersed with rapid turns called body saccades, a strategy that is thought to minimize motion blur. We analyzed the body saccades of fruit flies (Drosophila hydei), using high-speed 3D videography to track body and wing kinematics and a dynamically scaled robot to study the production of aerodynamic forces and moments. Although the size, degree and speed of the saccades vary, the dynamics of the maneuver are remarkably stereotypic. In executing a body saccade, flies perform a quick roll and counter-roll, combined with a slower unidirectional rotation around their yaw axis. Flies regulate the size of the turn by adjusting the magnitude of torque that they produce about these control axes, while maintaining the orientation of the rotational axes in the body frame constant. In this way, body saccades are different from escape responses in the same species, in which the roll and pitch component of banking is varied to adjust turn angle. Our analysis of the wing kinematics and aerodynamics showed that flies control aerodynamic torques during the saccade primarily by adjusting the timing and amount of span-wise wing rotation. PMID:25657212

  2. A turning cabin simulator to reduce simulator sickness

    NASA Astrophysics Data System (ADS)

    Mourant, Ronald R.; Yin, Zhishuai

    2010-01-01

    A long time problem associated with driving simulators is simulator sickness. A possible cause of simulator sickness is that the optical flow experienced in driving simulators is much different from that experienced in real world driving. With the potential to reduce simulator sickness, a turning cabin driving simulator, whose cabin rotates around the yaw axis was built. In the multi-projector display system, algorithms were implemented to calibrate both geometric distortions and photometric distortions via software to produce a seamless high-resolution display on a cylindrical screen. An automotive seat was mounted on an AC servo actuator at the center of the cylindrical screen. The force feedback steering wheel, and gas and brake pedals, were connected to the simulator's computer. Experiments were conducted to study the effect of optical flow patterns on simulator sickness. Results suggested that the optical flow perceived by drivers in the fixed base simulator was greater than that in the turning cabin simulator. Also, drivers reported a higher degree of simulator sickness in the fixed base simulator. The lower amount of optical flow perceived in the turning cabin simulator is believed to be a positive factor in reducing simulator sickness.

  3. An apical left ventricular aneurysm rupture presenting as left breast mass 11 years after surgical repair.

    PubMed

    Fok, M; Bashir, M; Hammoud, I; Harrington, D; Kuduvalli, M; Field, M; Oo, A

    2014-10-01

    Left ventricular (LV) pseudoaneurysm is a rare entity and, consequently, there is limited knowledge of the condition's natural history. The most frequent mode of presentation for LV pseudoaneurysm is heart failure with chest pain. However, the variable presentation of this condition requires a high index of suspicion for diagnosis. We report the case of a 75-year-old woman who had suffered an acute myocardial infarction 23 years previously, which resulted in a calcified LV apical aneurysm. Three weeks prior to being referred to our hospital, she was noted by her general practitioner to have a left-sided breast mass although mammography was negative. One week later, she attended the accident and emergency department; she was haemodynamically unstable but was resuscitated successfully. Contrast enhanced computed tomography showed a large haematoma located in the left chest wall communicating with the left ventricle. She underwent emergency cardiac surgical repair. On arrival at the intensive care unit following surgery, her haemodynamic status was unstable, and she deteriorated rapidly and died. With this report, we aim to raise the level of awareness for an apical LV pulsatile mass that could anatomically expand and present as a breast mass or tumour. An early diagnosis and timely surgical intervention is essential in order to achieve better outcomes and avoid detrimental complications. PMID:25245713

  4. Rare Anomalous Origin of Superior Left Pulmonary Artery from Left Subclavian Vein

    SciTech Connect

    Lv, Tian-shi Wang, Chao Song, Li Lv, Yong-xing Zou, Ying-hua

    2013-10-15

    We report for the first time an extremely rare anomalous origin of the superior left pulmonary artery in a 60 year-old man. Although it was occult in clinical indications, such a malformation still ought to be considered, especially during endovascular procedures.

  5. Are Students Left Behind? The Distributional Effects of the No Child Left Behind Act

    ERIC Educational Resources Information Center

    Krieg, John M.

    2008-01-01

    The No Child Left Behind Act imposes sanctions on schools if the fraction of students demonstrating proficiency on a high-stakes test falls below a statewide pass rate. While the motivation behind this system is improved public school performance, it also provides incentives for schools to focus educational resources on the marginal student rather…

  6. Left and Left Out: Teaching Children to Grieve through a Rehabilitation Curriculum.

    ERIC Educational Resources Information Center

    Goldberg, Francine R.; Leyden, Harriet D.

    1998-01-01

    Children do not often develop the skills and resources with which to grieve because they are routinely left out of the process. This article describes an ethnographic evaluation of an educational grief program based on mental health rehabilitation theory. The process includes a focus on improving competencies and behaviors. (EMK)

  7. Left Inferior Frontal Cortex and Syntax: Function, Structure and Behaviour in Patients with Left Hemisphere Damage

    ERIC Educational Resources Information Center

    Tyler, Lorraine K.; Marslen-Wilson, William D.; Randall, Billi; Wright, Paul; Devereux, Barry J.; Zhuang, Jie; Papoutsi, Marina; Stamatakis, Emmanuel A.

    2011-01-01

    For the past 150 years, neurobiological models of language have debated the role of key brain regions in language function. One consistently debated set of issues concern the role of the left inferior frontal gyrus in syntactic processing. Here we combine measures of functional activity, grey matter integrity and performance in patients with left…

  8. Left in the Margins: Asian American Students and the No Child Left Behind Act

    ERIC Educational Resources Information Center

    Redondo, Brian

    2008-01-01

    No Child Left Behind (NCLB) is a federal education law that was passed in 2001 with the laudable but challenging goal of closing the achievement gap between minority and white students and improving academic achievement among all students. To that end, NCLB has held states, school districts, and individual schools to impossibly high standards of…

  9. Left Hemisphere Regions Are Critical for Language in the Face of Early Left Focal Brain Injury

    ERIC Educational Resources Information Center

    Beharelle, Anjali Raja; Dick, Anthony Steven; Josse, Goulven; Solodkin, Ana; Huttenlocher, Peter R.; Levine, Susan C.; Small, Steven L.

    2010-01-01

    A predominant theory regarding early stroke and its effect on language development, is that early left hemisphere lesions trigger compensatory processes that allow the right hemisphere to assume dominant language functions, and this is thought to underlie the near normal language development observed after early stroke. To test this theory, we…

  10. NEWCAT: Parsing natural language using left-associative grammar

    SciTech Connect

    Hausser, R.

    1986-01-01

    This book shows that constituent structure analysis induces an irregular order of linear composition which is the direct cause of extreme computational inefficiency. It proposes an alternative left-associative grammar which operates with a regular order of linear compositions. Left-associative grammar is based on building up and cancelling valencies. Left-associative parsers differ from all other systems in that the history of the parse doubles as the linguistic analysis. Left-associative grammar is illustrated with two left-associative natural language parsers: one for German and one for English.

  11. Endocarditis in left ventricular assist device

    PubMed Central

    Thyagarajan, Braghadheeswar; Kumar, Monisha Priyadarshini; Sikachi, Rutuja R; Agrawal, Abhinav

    2016-01-01

    Summary Heart failure is one of the leading causes of death in developed nations. End stage heart failure often requires cardiac transplantation for survival. The left ventricular assist device (LVAD) has been one of the biggest evolvements in heart failure management often serving as bridge to transplant or destination therapy in advanced heart failure. Like any other medical device, LVAD is associated with complications with infections being reported in many patients. Endocarditis developing secondary to the placement of LVAD is not a frequent, serious and difficult to treat condition with high morbidity and mortality. Currently, there are few retrospective studies and case reports reporting the same. In our review, we found the most common cause of endocarditis in LVAD was due to bacteria. Both bacterial and fungal endocarditis were associated with high morbidity and mortality. In this review we will be discussing the risk factors, organisms involved, diagnostic tests, management strategies, complications, and outcomes in patients who developed endocarditis secondary to LVAD placement.

  12. Slow microwaves in left-handed materials

    NASA Astrophysics Data System (ADS)

    di Gennaro, E.; Parimi, P. V.; Lu, W. T.; Sridhar, S.; Derov, J. S.; Turchinetz, B.

    2005-07-01

    Remarkably slow propagation of microwaves in two different classes of left-handed materials (LHM’s) is reported from microwave-pulse and continuous-wave transmission measurements. Microwave dispersion in a composite LHM made of split-ring resonators and wire strips reveals group velocity vg˜c/50 , where c is the free-space light velocity. Photonic crystals (PhC’s) made of dielectric Al2O3 rods reveal vg˜c/10 . Group delay dispersion of both the composite LHM and PhC’s determined from the experiment is in complete agreement with that obtained from theory. The slow group velocities are quantitatively described by the strong dispersion observed in these materials.

  13. Making Tracks on Mars (left-eye)

    NASA Technical Reports Server (NTRS)

    2004-01-01

    NASA's Mars Exploration Rover Spirit has been making tracks on Mars for seven months now, well beyond its original 90-day mission. The rover traveled more than 3 kilometers (2 miles) to reach the 'Columbia Hills' pictured here. In this 360-degree view of the rolling martian terrain, its wheel tracks can be seen approaching from the northwest (right side of image).

    Spirit's navigation camera took the images that make up this mosaic on sols 210 and 213 (Aug. 5 and Aug. 8, 2004). The rover is now conducting scientific studies of the local geology on the 'Clovis' outcrop of the 'West Spur' region of the 'Columbia Hills.' The view is presented in a cylindrical-perspective projection with geometrical seam correction. This is the left-eye view of a stereo pair. Scientists plan for Spirit to take a color panoramic image from this location.

  14. Slow Progress in Dune (Left Rear Wheel)

    NASA Technical Reports Server (NTRS)

    2005-01-01

    The left rear wheel of NASA's Mars Exploration Rover Opportunity makes slow but steady progress through soft dune material in this movie clip of frames taken by the rover's rear hazard identification camera over a period of several days. The sequence starts on Opportunity's 460th martian day, or sol (May 10, 2005) and ends 11 days later. In eight drives during that period, Opportunity advanced a total of 26 centimeters (10 inches) while spinning its wheels enough to have driven 46 meters (151 feet) if there were no slippage. The motion appears to speed up near the end of the clip, but that is an artifact of individual frames being taken less frequently.

  15. Slow Progress in Dune (Left Front Wheel)

    NASA Technical Reports Server (NTRS)

    2005-01-01

    The left front wheel of NASA's Mars Exploration Rover Opportunity makes slow but steady progress through soft dune material in this movie clip of frames taken by the rover's front hazard identification camera over a period of several days. The sequence starts on Opportunity's 460th martian day, or sol (May 10, 2005) and ends 11 days later. In eight drives during that period, Opportunity advanced a total of 26 centimeters (10 inches) while spinning its wheels enough to have driven 46 meters (151 feet) if there were no slippage. The motion appears to speed up near the end of the clip, but that is an artifact of individual frames being taken less frequently.

  16. Ablation therapy for left atrial autonomic modification.

    PubMed

    Malcolme-Lawes, Louisa; Sandler, Belinda C; Sikkel, Markus B; Lim, Phang Boon; Kanagaratnam, Prapa

    2016-08-01

    The autonomic nervous system is implicated in the multifactorial pathogenesis of atrial fibrillation (AF) but few studies have attempted neural targeting for therapeutic intervention. We have demonstrated that short bursts of stimulation, at specific sites of left atrial ganglionated plexi (GPs), trigger fibrillation-inducing atrial ectopy and importantly continuous stimulation of these sites may not induce AV block, the 'conventional' marker used to locate GPs. We have shown that these ectopy-triggering GP (ET-GP) sites are anatomically stable and can be rendered inactive by either ablation at the site or by ablation between the site and the adjacent pulmonary vein (PV). This may have important implications for planning patient specific strategies for ablation of paroxysmal AF in the future. PMID:27595199

  17. An application for tunes and coupling evaluation from turn-by-turn data at the Fermilab Booster

    SciTech Connect

    Marsh, W.; Alexahin, Y.; Gianfelice-Wendt, E.; /Fermilab

    2011-03-01

    A console application using the phasing of Turn-by-Turn signals from the different BPMs has been tested at the Fermilab Booster. This technique allows the on-line detection of the beam tunes during the fast Booster ramp in conditions where other algorithms were unsuccessful. The application has been recently expanded to include the computation of the linear coupling coefficients. Algorithm and measurement results are presented. Although improved by the phased sum technique the automatic identification of the tunes is not always successful. This makes the use of the on-line application difficult. Ideas for further improvements are under investigation. Measurements have indicated that the effect of the skew quadrupoles is by a factor 3 weaker than expected from the nominal optics. A calibration of the skew quadrupole circuits using the TBT data is planned.

  18. Left Ventricular Diastolic Dysfunction in Peritoneal Dialysis

    PubMed Central

    Wu, Cho-Kai; Lee, Jen-Kuang; Wu, Yi-Fan; Tsai, Chia-Ti; Chiang, Fu-Tien; Hwang, Juey-Jen; Lin, Jiunn-Lee; Hung, Kuan-Yu; Huang, Jenq-Wen; Lin, Jou-Wei

    2015-01-01

    Abstract Left ventricular diastolic dysfunction (LVDD) is common among patients undergoing peritoneal dialysis (PD). We examined the relationship between LVDD, major adverse cardiovascular events (MACE), and mortality in PD patients. A total of 149 patients undergoing PD with preserved left ventricular systolic function were included and followed for 3.5 years. LVDD was diagnosed (according to the European Society of Cardiology guidelines) by conventional and tissue Doppler echocardiography. Serum high-sensitivity C-reactive protein (hsCRP) was measured. The location and volume of adipose tissue were assessed by computed tomography (CT) at the level of the fourth lumbar vertebra. Subjects with LVDD had higher levels of hsCRP, and more visceral and peritoneal fat than controls. The relationship between adjusted visceral adipose tissue and LVDD became nonsignificant when hsCRP and baseline demographic data were introduced into the logistic regression model (odds ratio = 1.52, P = 0.07). Subsequent hierarchical multivariate Cox regression analysis showed that LVDD was one of the most powerful determinants of MACE and mortality after adjusting for all confounding factors (hazard ratio [HR]: 1.71, 95% confidence interval [CI]: 1.43–3.51, P = 0.02 and HR: 2.25, 95% CI: 1.45–2.91, P = 0.04, respectively). Systemic inflammation (hsCRP) was also significantly associated with MACE and mortality (HR: 2.03, P = 0.03 and HR: 2.16, P = 0.04, respectively). LVDD is associated with systemic inflammation and increased visceral fat in patients undergoing PD. LVDD is also a sensitive, independent indicator of future MACE and mortality in PD patients. PMID:25997054

  19. Time left: linear versus logarithmic subjective time.

    PubMed

    Gibbon, J; Church, R M

    1981-04-01

    In two experiments, subjects were given a choice between a standard fixed interval to reinforcement and the time left to reinforcement in an elapsing comparison interval. In Experiment 1, rats were trained to respond on a comparison 60-sec fixed-interval schedule on one lever and a standard 30-sec fixed-interval schedule on a second lever. Then combined trials were given that began with the entry of the comparison 60-sec lever, followed by the standard 30-sec lever after 15, 30, or 45 sec. Rats preferred to respond on the standard lever when it entered early (at 15 sec), they preferred to respond on the comparison lever when the standard entered late (at 45 sec), and they were approximately indifferent between the two levers when the standard entered halfway through the comparison interval so that the remaining time to food was equal on both levers. In Experiment 2, pigeons were trained to choose between the time left to food in an elapsing comparison interval (C sec long) and a standard fixed interval one half as long (S = C/2) in a concurrent-chains paradigm. Birds came to choose the standard early and the comparison late in the trial interval. The indifference point was linearly related to the midpoint of the elapsing C interval at a variety of S,C pairs. The results of both experiments are consistent with a Scalar Timing theory in which subjective time is linear in real time and memory variance is scalar, and they are inconsistent with a logarithmic time scale.

  20. Proprioceptive target matching asymmetries in left-handed individuals.

    PubMed

    Goble, Daniel J; Noble, Brittany C; Brown, Susan H

    2009-08-01

    In right-handers, the ability to reproduce proprioceptive targets has been shown to be asymmetric, favoring the non-preferred left arm. The present study sought to determine whether a similar arm/hemisphere asymmetry exists for left-handers. Ten strong left-handed adults used the left or right arm to perform proprioceptive target matching tasks that varied in processing demands (i.e., need for memory, interhemispheric transfer) and target amplitude (20, 40 degrees). Similar to right-handers, left-handed individuals had smaller total errors when matching with the non-preferred arm. This asymmetry was greatest in conditions with increased processing demands and larger amplitude targets. These results provide the first evidence to date of right arm/left hemisphere dominance for proprioceptive target matching in left-handers that is the "mirror image" of right-handers.

  1. Remodeling of left circumflex coronary arterial tree in pacing-induced heart failure.

    PubMed

    Huo, Yunlong; Kassab, Ghassan S

    2015-08-15

    Congestive heart failure (CHF) is a very serious heart disease that manifests an imbalance between left ventricle supply and demand. Although the mechanical demand of the failing heart has been well characterized, the systematic remodeling of the entire coronary arterial tree that constitutes the supply of the myocardium is lacking. We hypothesize that the well-known increase in ventricle wall stress during CHF causes coronary vascular rarefaction to increase the vascular flow resistance, which in turn compromises the perfusion of the heart. Morphometric (diameters, length, and numbers) data of the swine left circumflex (LCx) arterial tree were measured in both CHF (n = 6) and control (n = 6) groups, from which a computer reconstruction of the entire LCx tree was implemented down to the capillary level to enable a hemodynamic analysis of coronary circulation. The vascular flow resistance was increased by ∼75% due to a significant decrease of vessel numbers (∼45%) and diameters in the first capillary segments (∼10%) of the LCx arterial tree after 3-4 wk of pacing. The structural remodeling significantly changed the wall shear stress in vessel segments of the entire LCx arterial tree of CHF animals. This study enhances our knowledge of coronary arterial tree remodeling in heart failure, which provides a deeper understanding of the deterioration of supply-demand relation in left ventricle.

  2. Remodeling of left circumflex coronary arterial tree in pacing-induced heart failure

    PubMed Central

    Huo, Yunlong

    2015-01-01

    Congestive heart failure (CHF) is a very serious heart disease that manifests an imbalance between left ventricle supply and demand. Although the mechanical demand of the failing heart has been well characterized, the systematic remodeling of the entire coronary arterial tree that constitutes the supply of the myocardium is lacking. We hypothesize that the well-known increase in ventricle wall stress during CHF causes coronary vascular rarefaction to increase the vascular flow resistance, which in turn compromises the perfusion of the heart. Morphometric (diameters, length, and numbers) data of the swine left circumflex (LCx) arterial tree were measured in both CHF (n = 6) and control (n = 6) groups, from which a computer reconstruction of the entire LCx tree was implemented down to the capillary level to enable a hemodynamic analysis of coronary circulation. The vascular flow resistance was increased by ∼75% due to a significant decrease of vessel numbers (∼45%) and diameters in the first capillary segments (∼10%) of the LCx arterial tree after 3-4 wk of pacing. The structural remodeling significantly changed the wall shear stress in vessel segments of the entire LCx arterial tree of CHF animals. This study enhances our knowledge of coronary arterial tree remodeling in heart failure, which provides a deeper understanding of the deterioration of supply-demand relation in left ventricle. PMID:26159756

  3. You Turn Me Cold: Evidence for Temperature Contagion

    PubMed Central

    Featherstone, Eric; Voon, Valerie; Singer, Tania; Critchley, Hugo D.; Harrison, Neil A.

    2014-01-01

    Introduction During social interactions, our own physiological responses influence those of others. Synchronization of physiological (and behavioural) responses can facilitate emotional understanding and group coherence through inter-subjectivity. Here we investigate if observing cues indicating a change in another's body temperature results in a corresponding temperature change in the observer. Methods Thirty-six healthy participants (age; 22.9±3.1 yrs) each observed, then rated, eight purpose-made videos (3 min duration) that depicted actors with either their right or left hand in visibly warm (warm videos) or cold water (cold videos). Four control videos with the actors' hand in front of the water were also shown. Temperature of participant observers' right and left hands was concurrently measured using a thermistor within a Wheatstone bridge with a theoretical temperature sensitivity of <0.0001°C. Temperature data were analysed in a repeated measures ANOVA (temperature × actor's hand × observer's hand). Results Participants rated the videos showing hands immersed in cold water as being significantly cooler than hands immersed in warm water, F(1,34) = 256.67, p<0.001. Participants' own hands also showed a significant temperature-dependent effect: hands were significantly colder when observing cold vs. warm videos F(1,34) = 13.83, p = 0.001 with post-hoc t-test demonstrating a significant reduction in participants' own left (t(35) = −3.54, p = 0.001) and right (t(35) = −2.33, p = 0.026) hand temperature during observation of cold videos but no change to warm videos (p>0.1). There was however no evidence of left-right mirroring of these temperature effects p>0.1). Sensitivity to temperature contagion was also predicted by inter-individual differences in self-report empathy. Conclusions We illustrate physiological contagion of temperature in healthy individuals, suggesting that empathetic understanding for primary low

  4. Stigmatisation and commercialisation of abortion services in Poland: turning sin into gold.

    PubMed

    Chełstowska, Agata

    2011-05-01

    This paper is about the economic consequences of the stigmatisation and illegality of abortion and its almost complete removal from public health services in Poland since the late 1980s. Once abortion left the public sphere, it entered the grey zone of private arrangements, in which a woman's private worries became someone else's private gain, and her sin turned into gold. The most important consequence was social inequality, as the right to health, life, information and safety became commodities on the free market. Women with money, who are more likely to have political influence, find this bearable, while working class women lack the political capital to protest. In the private sector, there are no government controls on price, quality of care or accountability, and almost no prosecutions. With an estimated 150,000 abortions per year, a rough estimate of US$ 95 million is being generated annually for doctors, unregistered and tax-free. Thus, the combined forces of right-wing ideology and neoliberal economic reforms have created reproductive and social injustice. To address this, stigmatisation of abortion must be countered. But a change in the political climate, a less restrictive interpretation of the law, or even a new law would not resolve the problem. Given reductions in public health care spending, abortion would remain excluded from state coverage unless neoliberal health care reforms could be reversed. PMID:21555090

  5. STS-92 Mission Specialist Wakata completes his turn driving the M-113

    NASA Technical Reports Server (NTRS)

    2000-01-01

    STS-92 Mission Specialist Koichi Wakata of Japan signals a successful driving lesson on the M-113 he is in. Capt. George Hoggard, trainer with the KSC Fire Department, sits on top. Behind Wakata are Commander Brian Duffy (left) and Leroy Chiao (right), waiting their turns. The practice drive is part of emergency egress training during Terminal Countdown Demonstration Test (TCDT) activities. The tracked vehicle could be used by the crew in the event of an emergency at the pad during which the crew must make a quick exit from the area. The TCDT also provides simulated countdown exercises and opportunities to inspect the mission payloads in the orbiter's payload bay. STS-92 is scheduled to launch Oct. 5 at 9:30 p.m. EDT on the fifth flight to the International Space Station. It will carry two elements of the Space Station, the Integrated Truss Structure Z1 and the third Pressurized Mating Adapter. The mission is also the 100th flight in the Shuttle program.

  6. Stigmatisation and commercialisation of abortion services in Poland: turning sin into gold.

    PubMed

    Chełstowska, Agata

    2011-05-01

    This paper is about the economic consequences of the stigmatisation and illegality of abortion and its almost complete removal from public health services in Poland since the late 1980s. Once abortion left the public sphere, it entered the grey zone of private arrangements, in which a woman's private worries became someone else's private gain, and her sin turned into gold. The most important consequence was social inequality, as the right to health, life, information and safety became commodities on the free market. Women with money, who are more likely to have political influence, find this bearable, while working class women lack the political capital to protest. In the private sector, there are no government controls on price, quality of care or accountability, and almost no prosecutions. With an estimated 150,000 abortions per year, a rough estimate of US$ 95 million is being generated annually for doctors, unregistered and tax-free. Thus, the combined forces of right-wing ideology and neoliberal economic reforms have created reproductive and social injustice. To address this, stigmatisation of abortion must be countered. But a change in the political climate, a less restrictive interpretation of the law, or even a new law would not resolve the problem. Given reductions in public health care spending, abortion would remain excluded from state coverage unless neoliberal health care reforms could be reversed.

  7. Reconstruction of the left-sided brachiocephalic trunk after vascular ring operation in left-handed child with Kommerell's diverticulum

    PubMed Central

    Haponiuk, Ireneusz; Chojnicki, Maciej; Jaworski, Radosław; Steffens, Mariusz; Szofer-Sendrowska, Aneta; Kwaśniak, Ewelina; Zieliński, Jacek; Gierat-Haponiuk, Katarzyna

    2013-01-01

    We report a case of a 2-year-old girl with prenatal diagnosis of vascular ring composed of a right-sided aortic arch, a left ligamentum arteriosum, and a left subclavian artery (arteria lusoria sin) originating from a retroesophageal Kommerell's diverticulum, who was referred for surgery with symptoms related to local compression – severe dysphagia and respiratory disorders. Through the left posterolateral thoracotomy, a ligamentum arteriosum between the Kommerell's diverticulum and the left pulmonary artery was divided and because of left-handedness of the child a brachiocephalic trunk was reconstructed in the fashion of anastomosis of the left subclavian artery and the left common carotid artery, originating from the ascending aorta. PMID:24570707

  8. Turn-By Beam Extraction during Acceleration in a Synchrotron

    NASA Astrophysics Data System (ADS)

    Tsoupas, Nicholaos; Trbojevic, Dejan

    2014-02-01

    A synchrotron to accelerate protons or carbon ions for medical applications is being designed at Brookhaven National Laboratory (BNL). Single beam bunches with maximum beam energy of 1.18 GeV and 400 MeV/u for protons and carbon ions respectively will be extracted from the synchrotron at 15 Hz. For protons, the maximum required energy for irradiating a tumor is ˜206 MeV. A pencil-like proton beam containing ˜5.4×107 p/bunch delivers a therapeutic dose of 2.5 Gy in ˜1.5 minutes to treat a tumor of 1 liter volume. It will take ˜80 minutes with bunches containing 4.5×104 ions/bunch to deliver the same dose of 2.5 Gy with a 400 MeV/u pencil-like carbon beam. This extended treatment time when using carbon ions is not acceptable. In addition, the synchrotron cannot be controlled with a beam bunch containing such a low number of carbon ions. To overcome these two problems of the extended treatment time and the low bunch intensity required for the treatment when carbon ions are used, we have devised a method to “peel” the required 4.5×104 carbon-ions/bunch from the accelerating carbon beam bunch containing ˜108 ions/bunch and deliver them to the tumor on a “turn-by-turn” basis. Unlike other methods of beam extraction from a synchrotron, such as resonance extraction, this method does not allow for any beam losses during the extraction and the carbon beam can be peeled off in less than 15 ms during the acceleration or deceleration cycle of the synchrotron. Thus, this turn-by-turn beam extraction method provides beam with variable energy and precisely controlled beam current during the 30 ms acceleration or deceleration time.

  9. Turned versus anodised dental implants: a meta-analysis.

    PubMed

    Chrcanovic, B R; Albrektsson, T; Wennerberg, A

    2016-09-01

    The aim of this meta-analysis was to test the null hypothesis of no difference in the implant failure rates, marginal bone loss (MBL)and post-operative infection for patients being rehabilitated by turned versus anodised-surface implants, against the alternative hypothesis of a difference. An electronic search without time or language restrictions was undertaken in November 2015. Eligibility criteria included clinical human studies, either randomised or not. Thirty-eight publications were included. The results suggest a risk ratio of 2·82 (95% CI 1·95-4·06, P < 0·00001) for failure of turned implants, when compared to anodised-surface implants. Sensitivity analyses showed similar results when only the studies inserting implants in maxillae or mandibles were pooled. There were no statistically significant effects of turned implants on the MBL (mean difference-MD 0·02, 95%CI -0·16-0·20; P = 0·82) in comparison to anodised implants. The results of a meta-regression considering the follow-up period as a covariate suggested an increase of the MD with the increase in the follow-up time (MD increase 0·012 mm year(-1) ), however, without a statistical significance (P = 0·813). Due to lack of satisfactory information, meta-analysis for the outcome 'post-operative infection' was not performed. The results have to be interpreted with caution due to the presence of several confounding factors in the included studies.

  10. Multi-turn, printed surface coil inductance, and Q optimization.

    PubMed

    Raad, A; Kan, S

    1993-03-01

    Wheeler's empirical inductance formula for a multi-turn, close-wound flat coil shows that the maximum inductance for a given length of wire occurs when the outer to inner radius ratios is equal to 15/7. A similar expression is proposed for a flat, printed spiral for surface coil antenna design by modifying one of the coefficients in Wheeler's formula. Measured inductance is in good agreement with this new formula and the optimum radius ratio for maximum inductance or Q is now of the order of 9/5.

  11. Turn over folders: a proven tool in succession management planning.

    PubMed

    Engells, Thomas E

    2011-01-01

    The dual challenges of succession management and succession management planning are considerable. A tool, the Turn over Folder, was introduced and described in detail as a useful first step in succession management planning. The adoption of that tool will not in itself produce a succession management plan, but it will orientate the organization and its members to the reality of succession management in all important leadership and critical positions. Succession management is an important consideration in all progressive organizations and well worth the effort.

  12. Bacteria turn on surfaces by oversteering with Type IV pili

    NASA Astrophysics Data System (ADS)

    Jin, Fan; Conrad, Jacinta C.; Gibiansky, Maxsim L.; Wong, Gerard C. L.

    2011-03-01

    Type-IV pili (TFP) are linear nano-actuators that enable bacteria to crawl on surfaces. Analysis of TFP-mediated crawling in P. aeruginosa reveals that it always alternates between two types of distinct movements: a linear translation of constant velocity is followed by a combined translation-rotation that is ~ 10 x faster in instantaneous velocity. The latter process can turn the cell body by over-steering so that the rear of the cell loses traction with the surface. Orientational distributions of these movements suggest that the former is due to pulling by multiple TFP, whereas the latter is mostly due to release by single TFP.

  13. The Opportunities and Threats of Turning Airports into Hubs

    NASA Technical Reports Server (NTRS)

    Kraus, Andreas; Koch, Benjamin

    2006-01-01

    This paper examines the opportunities and threats which arise when turning origin/destination airports into hubs. The analysis focuses on market development trends, competitive structures, especially in the light of airline network strategies and the growing rivalry between airports, and finally the potential financial impacts for the airport, including both investment efforts and the financial results from hub operations. We argue that in most cases a decision against converting a traditional origin/destination airport into a major transfer point is preferable to the transformation into a hub.

  14. Changes in the upper turning point due to magnetism

    NASA Technical Reports Server (NTRS)

    Jain, Rekha; Hindman, Bradley W.; Zweibel, Ellen G.

    1995-01-01

    It was observed that the p-mode power is substantially suppressed in magnetic regions. One possible explanation is that the upper turning point, the acoustic cut-off point of the solar p-modes is lowered in the presence of a magnetic field. A related possibility is that the attenuation length scale in the evanescent region is reduced in the presence of a magnetic field. It is likely that the observations sample a different position in the evanescent tails of the eigenfunctions in magnetic regions because of different temperature structures in these regions. A model is used to quantify the first of these effects.

  15. Why nature doesn't turn off neurosis.

    PubMed

    Badalamenti, Anthony F

    2013-03-01

    This paper develops an integration of psychoanalytic and wisdom tradition concepts to answer the question as to why nature does not turn off neurosis, The proposed answer is that nature wants a person to exploit the neurosis for two gains, one being the increase in adaptive capacity resulting from releasing it and the second involving the difficulty in the release itself, the latter related to gains proffered by the world's wisdom traditions. These see a movement from the psyche's creation by passive, unconscious means of finite promise rooted in parental love to creation by active, consciously chosen means of unlimited promise involving a direct relationship with nature and the Cosmos.

  16. Turning a remotely controllable observatory into a fully autonomous system

    NASA Astrophysics Data System (ADS)

    Swindell, Scott; Johnson, Chris; Gabor, Paul; Zareba, Grzegorz; Kubánek, Petr; Prouza, Michael

    2014-08-01

    We describe a complex process needed to turn an existing, old, operational observatory - The Steward Observatory's 61" Kuiper Telescope - into a fully autonomous system, which observers without an observer. For this purpose, we employed RTS2,1 an open sourced, Linux based observatory control system, together with other open sourced programs and tools (GNU compilers, Python language for scripting, JQuery UI for Web user interface). This presentation provides a guide with time estimates needed for a newcomers to the field to handle such challenging tasks, as fully autonomous observatory operations.

  17. Multi-turn, printed surface coil inductance, and Q optimization.

    PubMed

    Raad, A; Kan, S

    1993-03-01

    Wheeler's empirical inductance formula for a multi-turn, close-wound flat coil shows that the maximum inductance for a given length of wire occurs when the outer to inner radius ratios is equal to 15/7. A similar expression is proposed for a flat, printed spiral for surface coil antenna design by modifying one of the coefficients in Wheeler's formula. Measured inductance is in good agreement with this new formula and the optimum radius ratio for maximum inductance or Q is now of the order of 9/5. PMID:8450749

  18. Turning point sets the stage for emergency preparedness planning.

    PubMed

    Bekemeier, Betty; Dahl, Jan

    2003-01-01

    Nearly a billion dollars were made available to state health departments through federal grants in the spring of 2002 for public health emergency preparedness plans. Twenty-one states had already been participating for some years in The Robert Wood Johnson Foundation's Turning Point Initiative. This article illustrates how earlier practice and experience in developing cross-sector collaborations and institutionalizing a model of broad-based partnerships for public health decision making can increase effectiveness and efficiency in responding to a call for action around an emergency. PMID:15503602

  19. Study of left-handed materials

    NASA Astrophysics Data System (ADS)

    Zhou, Jiangfeng

    Left handed materials (LHMs) are artificial materials that have negative electrical permittivity, negative magnetic permeability, and negative index of refraction across a common frequency band. They possess electromagnetic (EM) properties not found in nature. LHMs have attracted tremendous attention because of their potential applications to build the perfect lens and cloaking devices. In the past few years there has been ample proof for the existence of LHMs in the microwave frequency range. Recently, researchers are trying hard to push the operating frequency of LHMs into terahertz and the optical regime. In this thesis, we start with the theoretical prediction of left handed materials made by Veselago 40 years ago, introducing the unique electromagnetic properties of the left handed materials. After discussing the realization of LHMs by the split ring resonators (SRRs) and wire designs, we briefly review the development of LHMs from microwave frequency to the optical regime. We discuss the chiral metamaterial, which provides an alternative approach to realize negative refractive index. In Chapter 2, we discuss the electromagnetic properties of the SRRs and the breakdown of linear scaling properties of SRRs at infrared and optical frequencies. By discussing the current modes, and the electric and magnetic moments, we study three resonance modes of SRR with respect to different polarizations of EM waves. Through numerical simulations, we find the breakdown of linear scaling, due to the free electron kinetic energy for frequencies above 100 THz. This result is important. It proves that researchers cannot push metamaterials into the optical regime by just scaling down the geometrical size of metamaterial designs used at low frequency. Due to the breakdown of the linear scaling property, a much smaller structure size of LHMs design is required in the optical regime, so new designs with simpler topology are needed. In Chapter 3, we discuss a short wire pair design

  20. Congenital left ventricular aneurysm coexisting with left ventricular non-compaction in a newborn.

    PubMed

    Ootani, Katsuki; Shimada, Jun; Kitagawa, Yosuke; Konno, Yuki; Miura, Fumitake; Takahashi, Toru; Ito, Etsuro; Ichinose, Kouta; Yonesaka, Susumu

    2014-10-01

    Described herein is the case of a rare combination of congenital left ventricular (LV) aneurysm and left ventricular non-compaction (LVNC) in a newborn. The patient developed refractory heart failure soon after birth and died at 5 months of age. The etiology of both congenital LV aneurysm and LVNC seems to be maldevelopment of the ventricular myocardium during early fetal life. Treatment should be individually tailored depending on clinical severity, and treatment options are limited. Given that this combination of congenital LV aneurysm and LVNC is significantly associated with poor prognosis, it appears that patients with congenital LV aneurysm and LVNC are candidates for early, aggressive intervention, including surgical aneurysmectomy and evaluation for transplantation. It is important to be aware of this combination of congenital LV aneurysm and LVNC, and to make earlier decisions on therapeutic strategy.

  1. Efficacy of anticoagulation in resolving left atrial and left atrial appendage thrombi: A transesophageal echocardiographic study

    NASA Technical Reports Server (NTRS)

    Jaber, W. A.; Prior, D. L.; Thamilarasan, M.; Grimm, R. A.; Thomas, J. D.; Klein, A. L.; Asher, C. R.

    2000-01-01

    BACKGROUND: Transesophageal echocardiography (TEE) is the gold standard for evaluation of the left atrium and the left atrial appendage (LAA) for the presence of thrombi. Anticoagulation is conventionally used for patients with atrial fibrillation to prevent embolization of atrial thrombi. The mechanism of benefit and effectiveness of thrombi resolution with anticoagulation is not well defined. METHODS AND RESULTS: We used a TEE database of 9058 consecutive studies performed between January 1996 and November 1998 to identify all patients with thrombi reported in the left atrium and/or LAA. One hundred seventy-four patients with thrombi in the left atrial cavity (LAC) and LAA were identified (1.9% of transesophageal studies performed). The incidence of LAA thrombi was 6.6 times higher than LAC thrombi (151 vs 23, respectively). Almost all LAC thrombi were visualized on transthoracic echocardiography (90.5%). Mitral valve pathology was associated with LAC location of thrombi (P <.0001), whereas atrial fibrillation or flutter was present in most patients with LAA location of thrombi. Anticoagulation of 47 +/- 18 days was associated with thrombus resolution in 80.1% of the patients on follow-up TEE. Further anticoagulation resulted in limited additional benefit. CONCLUSIONS: LAC thrombi are rare and are usually associated with mitral valve pathology. Transthoracic echocardiography is effective in identifying these thrombi. LAA thrombi occur predominantly in patients with atrial fibrillation or flutter. Short-term anticoagulation achieves a high rate of resolution of LAA and LAC thrombi but does not obviate the need for follow-up TEE.

  2. Turning Indium Oxide into a Superior Electrocatalyst: Deterministic Heteroatoms

    PubMed Central

    Zhang, Bo; Zhang, Nan Nan; Chen, Jian Fu; Hou, Yu; Yang, Shuang; Guo, Jian Wei; Yang, Xiao Hua; Zhong, Ju Hua; Wang, Hai Feng; Hu, P.; Zhao, Hui Jun; Yang, Hua Gui

    2013-01-01

    The efficient electrocatalysts for many heterogeneous catalytic processes in energy conversion and storage systems must possess necessary surface active sites. Here we identify, from X-ray photoelectron spectroscopy and density functional theory calculations, that controlling charge density redistribution via the atomic-scale incorporation of heteroatoms is paramount to import surface active sites. We engineer the deterministic nitrogen atoms inserting the bulk material to preferentially expose active sites to turn the inactive material into a sufficient electrocatalyst. The excellent electrocatalytic activity of N-In2O3 nanocrystals leads to higher performance of dye-sensitized solar cells (DSCs) than the DSCs fabricated with Pt. The successful strategy provides the rational design of transforming abundant materials into high-efficient electrocatalysts. More importantly, the exciting discovery of turning the commonly used transparent conductive oxide (TCO) in DSCs into counter electrode material means that except for decreasing the cost, the device structure and processing techniques of DSCs can be simplified in future. PMID:24173503

  3. Squeezed light from a diamond-turned monolithic cavity.

    PubMed

    Brieussel, A; Shen, Y; Campbell, G; Guccione, G; Janousek, J; Hage, B; Buchler, B C; Treps, N; Fabre, C; Fang, F Z; Li, X Y; Symul, T; Lam, P K

    2016-02-22

    For some crystalline materials, a regime can be found where continuous ductile cutting is feasible. Using precision diamond turning, such materials can be cut into complex optical components with high surface quality and form accuracy. In this work we use diamond-turning to machine a monolithic, square-shaped, doubly-resonant LiNbO3 cavity with two flat and two convex facets. When additional mild polishing is implemented, the Q-factor of the resonator is found to be limited only by the material absorption loss. We show how our monolithic square resonator may be operated as an optical parametric oscillator that is evanescently coupled to free-space beams via birefringent prisms. The prism arrangement allows for independent and large tuning of the fundamental and second harmonic coupling rates. We measure 2.6 ± 0.5 dB of vacuum squeezing at 1064 nm using our system. Potential improvements to obtain higher degrees of squeezing are discussed. PMID:26907056

  4. Turn-taking: From perception to speech preparation.

    PubMed

    Wesselmeier, Hendrik; Müller, Horst M

    2015-11-16

    We investigated the preparation of a spoken answer response to interrogative sentences by measuring response time (RT) and the response-related readiness potential (RP). By comparing the RT and RP results we aimed to identify whether the RP-onset is more related to the actual speech preparation process or the pure intention to speak after turn-anticipation. Additionally, we investigated if the RP-onset can be influenced by the syntactic structure (one or two completion points). Therefore, the EEG data were sorted based on two variables: the cognitive load required for the response and the syntactic structure of the stimulus questions. The results of the response utterance preparation associated event-related potential (ERP) and the RT suggest that the RP-onset is more related to the actual speech preparation process rather than the pure intention to speak after turn-anticipation. However, the RP-onset can be influenced by the syntactic structure of the question leading to an early response preparation. PMID:26483323

  5. UV Remote Sensing Data Products - Turning Data Into Knowledge

    NASA Astrophysics Data System (ADS)

    Weiss, M.; Paxton, L.; Schaefer, R. K.; Comberiate, J.; Hsieh, S. W.; Romeo, G.; Wolven, B. C.; Zhang, Y.

    2013-12-01

    The DMSP/SSUSI instruments have been taking UV images of the upper atmosphere for more than a decade. Each of the SSUSI instruments takes complete global UV images on a daily basis. Although this scientific data is very valuable, it is not actionable information. Perhaps the simplest use of SSUSI data is the assimilation of radiances into the GAIM ionospheric forecast model; even then, the data must be massaged to get it into a GAIM-ingestable form. We describe a development effort funded by the DMSP program and the Air Force Weather Agency to turn the raw data into actionable information in the form of SSUSI environmental data parameters and other derived information. We will describe current nowcasts, forecasts, and other related actionable information (e.g. auroral oval forecasts) that is currently generated by the SSUSI ground processing system for AFWA, and also concepts we have for future tools (e.g., geomagnetic storm alerts, scintillation forecasts, HF radio propagation information, auroral radar clutter) to turn more of the SSUSI dataset into actionable knowledge.

  6. Surface roughness when diamond turning RSA 905 optical aluminium

    NASA Astrophysics Data System (ADS)

    Otieno, T.; Abou-El-Hossein, K.; Hsu, W. Y.; Cheng, Y. C.; Mkoko, Z.

    2015-08-01

    Ultra-high precision machining is used intensively in the photonics industry for the production of various optical components. Aluminium alloys have proven to be advantageous and are most commonly used over other materials to make various optical components. Recently, the increasing demand from optical systems for optical aluminium with consistent material properties has led to the development of newly modified grades of aluminium alloys produced by rapid solidification in the foundry process. These new aluminium grades are characterised by their finer microstructures and refined mechanical and physical properties. However the machining database of these new optical aluminium grades is limited and more research is still required to investigate their machinability performance when they are diamond turned in ultrahigh precision manufacturing environment. This work investigates the machinability of rapidly solidified aluminium RSA 905 by varying a number of diamond-turning cutting parameters and measuring the surface roughness over a cutting distance of 4 km. The machining parameters varied in this study were the cutting speed, feed rate and depth of cut. The results showed a common trend of decrease in surface roughness with increasing cutting distance. The lowest surface roughness Ra result obtained after 4 km in this study was 3.2 nm. This roughness values was achieved using a cutting speed of 1750 rpm, feed rate of 5 mm/min and depth of cut equal to 25 μm.

  7. Smoothing of Diamond-Turned Substrates for Extreme Ultraviolet Illuminators

    SciTech Connect

    Soufli, R; Spiller, E; Schmidt, M A; Robinson, J C; Baker, S L; Ratti, S; Johnson, M A; Gullikson, E M

    2003-11-13

    Condenser optics in extreme ultraviolet lithography (EUVL) systems are subjected to frequent replacement as they are positioned close to the illumination source, where increased heating and contamination occur. In the case of aspherical condenser elements made by optical figuring/finishing, their replacement can be very expensive (several hundred thousand dollars). One approach to this problem would be to manufacture inexpensive illuminator optics that meet all required specifications and could be replaced at no substantial cost. Diamond-turned metal substrates are a factor of 100 less expensive than conventional aspherical substrates but have insufficient finish, leading to unacceptably low EUV reflectance after multilayer coating. In this work it is shown that, by applying a smoothing film prior to multilayer coating, the high spatial frequency roughness of a diamond-turned metal substrate is reduced from 1.76 to 0.27 nm rms while the figure slope error is maintained at acceptable levels. Metrology tests performed at various stages of the fabrication of the element demonstrated that it satisfied all critical figure and finish specifications as illuminator. Initial experimental results on the stability and performance of the optic under a real EUVL plasma source environment show no accelerated degradation when compared to conventional substrates.

  8. The electrocardiographic features of complete and partial left anterior and left posterior hemiblock.

    PubMed

    Elizari, Marcelo Víctor; Chiale, Pablo Ambrosio

    2012-09-01

    The aim of this study is to present the criteria for the diagnosis of incomplete or partial block within the anterior and posterior divisions of the left bundle-branch (LBB). To disclose incomplete left anterior hemiblock (LAH) and incomplete left posterior hemiblock (LPH), clinical cases of pathologic and physiologic intermittent or transient block in the divisions of the LBB are analyzed. When dealing with the diagnosis of incomplete LAH, an ÂQRS shift in the same or in successive tracings in a patient, showing electrical axis at +50°, +40°, +30°, and 0° covering the whole range up to -45° or even more negative, makes the diagnosis of incomplete to complete block in the anterior division of the LBB. Conversely, when LPH is the case, a progressive change of the ÂQRS from a normal axis to the right, up to +120° in the same or subsequent tracings in a short period, can only be explained by increasing the degrees of LPH. When a partial or incomplete LAH or LPH is present and the ÂQRS direction can be considered normal in clinical practice, it is difficult or even impossible to reach a diagnosis. That is, small degrees of block in the divisions of the LBB totally overlap normal variants.

  9. Positive Effects of Specific Exercise and Novel Turning-based Treadmill Training on Turning Performance in Individuals with Parkinson’s disease: A Randomized Controlled Trial

    PubMed Central

    Cheng, Fang-Yu; Yang, Yea-Ru; Chen, Li-Mei; Wu, Yih-Ru; Cheng, Shih-Jung; Wang, Ray-Yau

    2016-01-01

    Two different training strategies to improve turning performance in individuals with Parkinson’s disease (PD) were designed and investigated in this study. Subjects were randomly assigned to a specific exercise group, turning-based training group, or control group to receive training that emphasized balance and strengthening, turning-based treadmill training, and general exercise training, respectively. A total of 12 30-min training sessions followed by 10 min of turning training on a level surface were administered over 4 to 6 weeks. The results (n = 12 for each group) showed that both the specific exercise and turning-based training group experienced improved turning performance, the primary outcome, compared with the control group (specific exercise, 33% change, p = 0.016; turning-based training, 35% change, p = 0.021). For the secondary outcomes, the specific exercise group performed better than the control group on the Tinetti balance scale, limit of stability test and lower extremity extensor and abductor strength. The turning-based training groups performed better than the control group in sensory organization and ankle plantar flexor strength. In summary, specific exercise training and turning-based treadmill training were both effective in improving turning performance in participants with PD. However, the improvements in turning performance of these two groups resulted from improving different aspects of impairment in individuals with PD. PMID:27628128

  10. Positive Effects of Specific Exercise and Novel Turning-based Treadmill Training on Turning Performance in Individuals with Parkinson's disease: A Randomized Controlled Trial.

    PubMed

    Cheng, Fang-Yu; Yang, Yea-Ru; Chen, Li-Mei; Wu, Yih-Ru; Cheng, Shih-Jung; Wang, Ray-Yau

    2016-01-01

    Two different training strategies to improve turning performance in individuals with Parkinson's disease (PD) were designed and investigated in this study. Subjects were randomly assigned to a specific exercise group, turning-based training group, or control group to receive training that emphasized balance and strengthening, turning-based treadmill training, and general exercise training, respectively. A total of 12 30-min training sessions followed by 10 min of turning training on a level surface were administered over 4 to 6 weeks. The results (n = 12 for each group) showed that both the specific exercise and turning-based training group experienced improved turning performance, the primary outcome, compared with the control group (specific exercise, 33% change, p = 0.016; turning-based training, 35% change, p = 0.021). For the secondary outcomes, the specific exercise group performed better than the control group on the Tinetti balance scale, limit of stability test and lower extremity extensor and abductor strength. The turning-based training groups performed better than the control group in sensory organization and ankle plantar flexor strength. In summary, specific exercise training and turning-based treadmill training were both effective in improving turning performance in participants with PD. However, the improvements in turning performance of these two groups resulted from improving different aspects of impairment in individuals with PD. PMID:27628128

  11. Tool use disorders after left brain damage

    PubMed Central

    Baumard, Josselin; Osiurak, François; Lesourd, Mathieu; Le Gall, Didier

    2014-01-01

    In this paper we review studies that investigated tool use disorders in left-brain damaged (LBD) patients over the last 30 years. Four tasks are classically used in the field of apraxia: Pantomime of tool use, single tool use, real tool use and mechanical problem solving. Our aim was to address two issues, namely, (1) the role of mechanical knowledge in real tool use and (2) the cognitive mechanisms underlying pantomime of tool use, a task widely employed by clinicians and researchers. To do so, we extracted data from 36 papers and computed the difference between healthy subjects and LBD patients. On the whole, pantomime of tool use is the most difficult task and real tool use is the easiest one. Moreover, associations seem to appear between pantomime of tool use, real tool use and mechanical problem solving. These results suggest that the loss of mechanical knowledge is critical in LBD patients, even if all of those tasks (and particularly pantomime of tool use) might put differential demands on semantic memory and working memory. PMID:24904487

  12. [Mnesic disorders caused by left temporal gliomas].

    PubMed

    Verlut, C; Sylvestre, G; Curtit, E; Baron, M-H; Medeiros De Bustos, E; Moulin, T; Magnin, E

    2015-04-01

    Episodic memory disorders are frequent in patients with temporal lesion. Verbal or visuo-spatial memory disorders depend on the location and the lateralization of the lesion. These disorders are well described in temporal epilepsy but rarely in population with cerebral tumor and especially not specifically focus on temporal glioma. The purpose of this study was to describe neuropsychological examination in patient with temporal glioma in the database of the regional memory centre of Besançon. Four patients were identified (all right-handed and with a left temporal glioma). Verbal episodic memory impairment and auditory-verbal short-term memory impairment were observed. One patient had also visual memory disorders. Therefore, further investigations showed an associated Alzheimer's disease. This finding modified the clinical management of this patient. Extensive neuropsychological assessment should be systematic initially to seek an associated pathology, especially in elderly patients, if the cognitive profile is unusual, during the follow-up to better understand cognitive evolution and the effect of therapies on cognition.

  13. Endocarditis in left ventricular assist device

    PubMed Central

    Thyagarajan, Braghadheeswar; Kumar, Monisha Priyadarshini; Sikachi, Rutuja R; Agrawal, Abhinav

    2016-01-01

    Summary Heart failure is one of the leading causes of death in developed nations. End stage heart failure often requires cardiac transplantation for survival. The left ventricular assist device (LVAD) has been one of the biggest evolvements in heart failure management often serving as bridge to transplant or destination therapy in advanced heart failure. Like any other medical device, LVAD is associated with complications with infections being reported in many patients. Endocarditis developing secondary to the placement of LVAD is not a frequent, serious and difficult to treat condition with high morbidity and mortality. Currently, there are few retrospective studies and case reports reporting the same. In our review, we found the most common cause of endocarditis in LVAD was due to bacteria. Both bacterial and fungal endocarditis were associated with high morbidity and mortality. In this review we will be discussing the risk factors, organisms involved, diagnostic tests, management strategies, complications, and outcomes in patients who developed endocarditis secondary to LVAD placement. PMID:27672540

  14. Recurrent syncope after left atrial appendage occlusion.

    PubMed

    Cruz-Gonzalez, Ignacio; Perez-Rivera, Jose-Angel; Bethencourt, Armando

    2015-02-01

    We present the case of a 72-year-old woman with permanent atrial fibrillation and contraindication to long-term oral anticoagulant therapy who underwent left atrial appendage (LAA) occlusion. A 24-mm Amplatzer Cardiac Plug (St Jude Medical) device was deployed. The inferior part of the external disc of the device appeared to be over the posterior leaflet of the mitral valve but no significant mitral stenosis or mitral regurgitation was detected before deployment. After the procedure the patient suffered several syncopes when she tried to stand up. A transesophageal echocardiography (TEE) was performed and no significant differences on the device position were detected, it was not possible to perform the TEE in a stand-up position due to the patient symptoms (hypotension, tachycardia, dizziness, and loss of consciousness). After discussion with the surgical team, surgical removal of the device and surgical exclusion of LAA was performed. The symptoms disappeared and the patient was discharged. In the best of our knowledge, this is the first time that recurrent syncope has been described as a complication of LAA occlusion. PMID:25044597

  15. What's 'left' in the 'Garden of Sweden'?

    PubMed

    Olsen, Gregg M

    2013-01-01

    Liberalization, restructuring, and retrenchment have been underway in Sweden for more than two decades and have rapidly accelerated under the current non-socialist coalition government. It is uncertain how much of the Swedish social policy model is "left" now, in terms of both what remains of it and its political character. A cross-temporal look at developments within Sweden reveals striking and continual rollbacks and marketization since the 1990s. However, this view must be qualified, both because Sweden's undisputed descent is from a comparatively lofty position and because there have been some noteworthy, but often ignored, gains even amidst marked decline over the past few decades. A cross-national examination indicates that, despite rapidly rising rates of income and wealth inequality, Sweden remains an egalitarian leader in several respects. This view must be qualified, too, because, while it continues to routinely out-perform Anglo nations such as Canada, the United Kingdom, and the United States, Sweden is less often, and less notably, distinct from several of its continental counterparts in Europe now. Moreover, the foundation of the model, labor strength, has been significantly undermined.

  16. Atomic preference between left and right

    SciTech Connect

    Bouchiat, M.A.; Pottier, L.

    1984-06-01

    According to theoretical calculations, the weak force between each electron and the atomic nucleus should cause small perturbations in the orbits of the electrons, provided the electrons wander close enough to feel the effects of the weak force. The perturbations caused by the weak force should give rise to a small violation of parity in the atom. The effects of the weak force in the atom can therefore be tested experimentally in a way that is conceptually straight forward, although by no means practically so: the configuration of the atoms in a gas is given a preferential handedness, say left, and some suitable property of the atom is measured. The configuration is then replaced by one that coincides with the mirror image of the first configuration; the second configuration must therefore have a preferential handedness opposite to that of the first. The same atomic property is then measured for the second configuration. If the measured property in the second experiment is not the exact mirror image of the first result, parity is violated. Several groups, including the authors have confirmed the existence of parity violations in a few atomic systems. One group observed parity violations in the thalium atom. The authors used cesium in their experiment to show parity violation.

  17. Endocarditis in left ventricular assist device.

    PubMed

    Thyagarajan, Braghadheeswar; Kumar, Monisha Priyadarshini; Sikachi, Rutuja R; Agrawal, Abhinav

    2016-08-01

    Heart failure is one of the leading causes of death in developed nations. End stage heart failure often requires cardiac transplantation for survival. The left ventricular assist device (LVAD) has been one of the biggest evolvements in heart failure management often serving as bridge to transplant or destination therapy in advanced heart failure. Like any other medical device, LVAD is associated with complications with infections being reported in many patients. Endocarditis developing secondary to the placement of LVAD is not a frequent, serious and difficult to treat condition with high morbidity and mortality. Currently, there are few retrospective studies and case reports reporting the same. In our review, we found the most common cause of endocarditis in LVAD was due to bacteria. Both bacterial and fungal endocarditis were associated with high morbidity and mortality. In this review we will be discussing the risk factors, organisms involved, diagnostic tests, management strategies, complications, and outcomes in patients who developed endocarditis secondary to LVAD placement. PMID:27672540

  18. Atypical interhemispheric communication in left-handed individuals.

    PubMed

    Iwabuchi, Sarina J; Kirk, Ian J

    2009-01-28

    The relative latencies of evoked electroencephalogram potentials to lateralized visual stimuli were used to calculate the interhemispheric transfer time (IHTT) in right-handed and left-handed males. We confirmed earlier observations of a directional asymmetry in right-handed males. That is, IHTT from the right to the left hemisphere is significantly shorter than from the left to the right. We showed for the first time, however, that this directional asymmetry is not seen in left-handed males. It is suggested that differences in the cytoarchitechtonics of the right and left hemisphere (differences that may result in lateralization of function per se) underlie the asymmetric IHTT in right handers, and that these differences are less pronounced in left handers.

  19. [Cardiac resynchronization through a persistent left superior vena cava].

    PubMed

    Moriña-Vázquez, P; Barba-Pichardo, R; Venegas Gamero, J; Herrera Carranza, M

    2006-12-01

    Cardiac resynchronization therapy is effective in the treatment of patients with severe heart failure and intraventricular dysynchrony. However, we are sometimes faced with the unexpected presence of a persistent left superior vena cava. We report the case of a patient with dilated cardiomyopathy and left ventricular dysynchrony in which we implanted a resynchronization pacemaker exclusively through a persistent left superior vena cava that did not communicate with the right vena cava. PMID:17194405

  20. Canine left ventricular mass estimation by two-dimensional echocardiography.

    PubMed

    Schiller, N B; Skiôldebrand, C G; Schiller, E J; Mavroudis, C C; Silverman, N H; Rahimtoola, S H; Lipton, M J

    1983-07-01

    This study was designed to develop a two-dimensional echocardiographic method of measuring the mass of the left ventricle. The general formula for an ellipse was used to derive an algorithm that described the shell volume of concentric truncated ellipsoids. In 10 canine left ventricular two-dimensional echocardiograms, this algorithm accurately predicted postmortem left ventricular mass (r = .98, SEE +/- 6 g) and was independent of cardiac cycle phase (systole vs diastole, r = .92). PMID:6851047