Science.gov

Sample records for aft exit cone

  1. Verification of RSRM Nozzle Thermal Models With ETM-3 Aft Exit Cone In-depth Temperature Measurements

    NASA Technical Reports Server (NTRS)

    Maw, Joel F.; Lui, Robbie C.; Totman, Peter D.

    2004-01-01

    One of the goals of the Engineering Test Motor (ETM-3) static test was to verify analytical models through the use of instrumentation that provide real-time transient temperature response of ablating phenolic liners. Accurate measurement of in-depth temperature is critical for validating the analytical models and assessing design safety margins for nozzle insulation materials. Recent developments of in-depth thermocouple plugs have been made to more accurately measure temperature response of nozzle Liners. Thermocouple plugs were installed at two axial stations (four plugs circumferentially at each station) near the end of the ETM-3 nozzle aft exit cone to gather temperature histories during and after motor operation. The thermocouple plugs were placed at depths that bounded the reusable solid rocket motor nominal measured char depth in order to portray the carbon phenolic temperature response during the charring process. The data were used to verify the analytical models during motor operation and to better define char penetration during heat soak after motor burn out.

  2. Hydroburst test of a carbon-carbon involute exit cone

    NASA Technical Reports Server (NTRS)

    Sullivan, Roy M.

    1986-01-01

    A hydroburst test of the aft portion of the PAM-D exit cone and the test procedure are described in detail. The hydrostatic pressure required to buckle the cone was 9.75 psi. Meanwhile, the PAM-D exit cone was modeled using the finite element method and a theoretical bucking pressure (8.76 psi) was predicted using the SPAR finite element code. The modeling technique employed is discussed. By comparing the theoretical to predicted critical pressures, this report verifies the modeling technique and calculates a material knockdown factor for the carbon-carbon exit cone.

  3. Steam exit flow design for aft cavities of an airfoil

    SciTech Connect

    Storey, James Michael; Tesh, Stephen William

    2002-01-01

    Turbine stator vane segments have inner and outer walls with vanes extending therebetween. The inner and outer walls have impingement plates. Steam flowing into the outer wall passes through the impingement plate for impingement cooling of the outer wall surface. The spent impingement steam flows into cavities of the vane having inserts for impingement cooling the walls of the vane. The steam passes into the inner wall and through the impingement plate for impingement cooling of the inner wall surface and for return through return cavities having inserts for impingement cooling of the vane surfaces. A skirt or flange structure is provided for shielding the steam cooling impingement holes adjacent the inner wall aerofoil fillet region of the nozzle from the steam flow exiting the aft nozzle cavities. Moreover, the gap between the flash rib boss and the cavity insert is controlled to minimize the flow of post impingement cooling media therebetween. This substantially confines outflow to that exiting via the return channels, thus furthermore minimizing flow in the vicinity of the aerofoil fillet region that may adversely affect impingement cooling thereof.

  4. STS-55 Pilot Henricks uses CTE equipment mounted on SL-D2 aft end cone

    NASA Technical Reports Server (NTRS)

    1993-01-01

    STS-55 Pilot Terence T. Henricks, positioned in front of an adjustable workstation mounted on the Spacelab Deutsche 2 (SL-D2) science module aft end cone, conducts Crew Telesupport Experiment (CTE). The STS-55 crew portrait (STS055(S)002) appears on the screen of the Macintosh portable computer. CTE will demonstrate real-time communication between the shuttle crew and the ground via a computer-based multimedia documentation file that includes text, graphics, and photos. CTE is expected to improve the effectiveness of on-orbit payload operations, returns from scientific investigations, crew interaction with the ground, and contingency maintenance tasks for systems and payloads. Also in the view and attached to the end cone are a fire extinguisher, a checklist, and an STS-37 extravehicular activity (EVA) photo of Mission Specialist (MS1) and Payload Commander (PLC) Jerry L. Ross (STS037-18-032).

  5. SRB/SLEEC (Solid Rocket Booster/Shingle Lap Extendible Exit Cone) feasibility study, volume 1

    NASA Technical Reports Server (NTRS)

    Baker, William H., Jr.

    1986-01-01

    A preliminary design and analysis was completed for a SLEEC (Shingle Lap Extendible Exit Cone) which could be incorporated on the Space Transportation System (STS) Solid Rocket Booster (SRB). Studies were completed which predicted weights and performance increases and development plans were prepared for the full-scale bench and static test of SLEEC. In conjunction with the design studies, a series of supporting analyses were performed to assure the validity and feasibility of performance, fabrication, cost, and reliability for the selected design. The feasibility and required amounts of bench, static firing, and flight tests considered necessary for the successful incorporation of SLEEC on the Shuttle SRBs were determined. Preliminary plans were completed which define both a follow on study effort and a development program.

  6. Experimental investigation of the effects of aft blowing with various nozzle exit geometries on a 3.0 caliber tangent ogive at high angles of attack: Forebody pressure distributions

    NASA Technical Reports Server (NTRS)

    Chokani, Ndaona; Gittner, N. M.

    1992-01-01

    An experimental study of the effects of aft blowing on the asymmetric vortex flow of a slender, axisymmetric body at high angles of attack was conducted. A 3.0 caliber tangent ogive body fitted with a cylindrical afterbody was tested in a wind tunnel under subsonic, laminar flow test conditions. Asymmetric blowing from both a single nozzle and a double nozzle configuration, positioned near the body apex, was studied. Aft blowing was observed to alter the vortex asymmetry by moving the blowing-side vortex closer to the body surface while moving the non-blowing-side vortex further away from the body. The effect of increasing the blowing coefficient was to move the blowing-side vortex closer to the body surface at a more upstream location. The data also showed that blowing was more effective in altering the initial vortex asymmetry at the higher angles of attack than at the lower. The effects of changing the nozzle exit geometry were studied and it was observed that blowing from a nozzle with a low, broad exit geometry was more effective in reducing the vortex asymmetry than blowing from a high, narrow exit geometry.

  7. SU-E-J-99: Reconstruction of Cone Beam CT Image Using Volumetric Modulated Arc Therapy Exit Beams

    SciTech Connect

    Jeong, K; Goddard, L; Savacool, M; Mynampati, D; Godoy Scripes, P; Tome', W; Kuo, H; Basavatia, A; Hong, L; Yaparpalvi, R; Kalnicki, S

    2014-06-01

    Purpose: To test the possibility of obtaining an image of the treated volume during volumetric modulated arc therapy (VMAT) with exit beams. Method: Using a Varian Clinac 21EX and MVCT detector the following three sets of detector projection data were obtained for cone beam CT reconstruction with and without a Catphan 504 phantom. 1) 72 projection images from 20 × 16 cm{sup 2} open beam with 3 MUs, 2) 72 projection images from 20 × 16 cm{sup 2} MLC closed beam with 14 MUs. 3) 137 projection images from a test RapicArc QA plan. All projection images were obtained in ‘integrated image’ mode. We used OSCaR code to reconstruct the cone beam CT images. No attempts were made to reduce scatter or artifacts. Results: With projection set 1) we obtained a good quality MV CBCT image by optimizing the reconstruction parameters. Using projection set 2) we were not able to obtain a CBCT image of the phantom, which was determined to be due to the variation of interleaf leakage with gantry angle. From projection set 3), we were able to obtain a weak but meaningful signal in the image, especially in the target area where open beam signals were dominant. This finding suggests that one might be able to acquire CBCT images with rough body shape and some details inside the irradiated target area. Conclusion: Obtaining patient images using the VMAT exit beam is challenging but possible. We were able to determine sources of image degradation such as gantry angle dependent interleaf leakage and beams with a large scatter component. We are actively working on improving image quality.

  8. SRB/SLEEC (Solid Rocket Booster/Shingle Lap Extendible Exit Cone) feasibility study, volume 2. Appendix A: Design study for a SLEEC actuation system

    NASA Technical Reports Server (NTRS)

    Thompson, D. S.

    1986-01-01

    The results are presented of a design feasibility study of a self-contained (powered) actuation system for a Shingle Lap Extendible Exit Cone (SLEEC) for Transportation System (STS). The evolution of the SLEEC actuation system design is reviewed, the final design concept is summarized, and the results of the detailed study of the final concept of the actuation system are treated. A conservative design using proven mechanical components was established as a major program priority. The final mechanical design has a very low development risk since the components, which consist of ballscrews, gearing, flexible shaft drives, and aircraft cables, have extensive aerospace applications and a history of proven reliability. The mathematical model studies have shown that little or no power is required to deploy the SLEEC actuation system because acceleration forces and internal pressure from the rocket plume provide the required energies. A speed control brake is incorporated in the design in order to control the rate of deployment.

  9. General view of the Aft Skirt Assembly and the Aft ...

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

    General view of the Aft Skirt Assembly and the Aft Solid Rocket Motor Segment mated together in the Vehicle Assembly Building at Kennedy Space Center and being prepared for mounting onto the Mobile Launch Platform and mating with the other Solid Rocket Booster segments. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  10. Aft outer rim seal arrangement

    SciTech Connect

    Lee, Ching-Pang; Tham, Kok-Mun; Schroeder, Eric; Meeroff, Jamie; Miller, Jr., Samuel R; Marra, John J; Campbell, Christian X

    2015-04-28

    An outer rim seal arrangement (10), including: an annular rim (70) centered about a longitudinal axis (30) of a rotor disc (31), extending fore and having a fore-end (72), an outward-facing surface (74), and an inward-facing surface (76); a lower angel wing (62) extending aft from a base of a turbine blade (22) and having an aft end (64) disposed radially inward of the rim inward-facing surface to define a lower angel wing seal gap (80); an upper angel wing (66) extending aft from the turbine blade base and having an aft end (68) disposed radially outward of the rim outward-facing surface to define a upper angel wing seal gap (80, 82); and guide vanes (100) disposed on the rim inward-facing surface in the lower angel wing seal gap. Pumping fins (102) may be disposed on the upper angel wing seal aft end in the upper angel wing seal gap.

  11. Detail view of the flight deck looking aft. The aft ...

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

    Detail view of the flight deck looking aft. The aft viewing windows are uncovered in this view and look out towards the payload bay. The overhead viewing windows have exterior covers in place in this view. The aft flight deck contains displays and controls for executing maneuvers for rendezvous, docking, payload deployment and retrieval, payload monitoring and the remote manipulator arm controls. Payload bay doors are also operated from this location. This view was taken in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  12. Jet engine nozzle exit configurations and associated systems and methods

    NASA Technical Reports Server (NTRS)

    Mengle, Vinod G. (Inventor)

    2011-01-01

    Nozzle exit configurations and associated systems and methods are disclosed. An aircraft system in accordance with one embodiment includes a jet engine exhaust nozzle having an internal flow surface and an exit aperture, with the exit aperture having a perimeter that includes multiple projections extending in an aft direction. Aft portions of individual neighboring projections are spaced apart from each other by a gap, and a geometric feature of the multiple can change in a monotonic manner along at least a portion of the perimeter.

  13. Jet Engine Nozzle Exit Configurations and Associated Systems and Methods

    NASA Technical Reports Server (NTRS)

    Mengle, Vinod G. (Inventor)

    2013-01-01

    Nozzle exit configurations and associated systems and methods are disclosed. An aircraft system in accordance with one embodiment includes a jet engine exhaust nozzle having an internal flow surface and an exit aperture, with the exit aperture having a perimeter that includes multiple projections extending in an aft direction. Aft portions of individual neighboring projections are spaced apart from each other by a gap, and a geometric feature of the multiple can change in a monotonic manner along at least a portion of the perimeter.

  14. External tank aft cargo carrier

    NASA Technical Reports Server (NTRS)

    Mobley, T. B.

    1984-01-01

    The External Tank (ET) Aft Cargo Carrier (ACC) is a low cost, low risk augmentation of the Space Transportation System (STS). It almost doubles the cargo volume of the STS while minimally impacting other STS elements (orbiter, ET and solid rocket boosters SRBs, launch facilities and STS operations. In addition to increasing the potential volume of cargo carried on a Shuttle launch, the ACC provides the following additional benefits: (1) Increased STS competitiveness for payloads; (2) Increased cargo manifest flexibility; (3) Increased spacecraft design options; (4) Alternate manifesting for special payloads; and (5) Future space platform/station design options.

  15. Jet engine nozzle exit configurations, including projections oriented relative to pylons, and associated systems and methods

    NASA Technical Reports Server (NTRS)

    Mengle, Vinod G. (Inventor); Thomas, Russell H. (Inventor)

    2012-01-01

    Nozzle exit configurations and associated systems and methods are disclosed. An aircraft system in accordance with one embodiment includes a jet engine exhaust nozzle having an internal flow surface and an exit aperture, with the exit aperture having a perimeter that includes multiple projections extending in an aft direction. Aft portions of individual neighboring projections are spaced apart from each other by a gap, and a geometric feature of the multiple can change in a monotonic manner along at least a portion of the perimeter. Projections near a support pylon and/or associated heat shield can have particular configurations, including greater flow immersion than other projections.

  16. Commander Brand sleeps on aft flight deck

    NASA Technical Reports Server (NTRS)

    1982-01-01

    Commander Brand, with hands folded in front of his chest, sleeps on aft flight deck. Brand's head is just above aft flight deck floor with his back to onorbit station panels. The back and feet of a second crewmember appear next to Brand.

  17. Space Shuttle Orbiter AFT heat shield seal

    NASA Technical Reports Server (NTRS)

    Walkover, L. J.

    1979-01-01

    The evolution of the orbiter aft heat shield seal (AHSS) design, which involved advancing mechanical seal technology in severe thermal environment is discussed. The baseline design, various improvements for engine access, and technical problem solution are presented. It is a structure and mechanism at the three main propulsion system (MPS) engine interfaces to the aft compartment structure. Access to each MPS engine requires disassembly and removal of the AHSS. Each AHSS accommodates the engine movement, is exposed to an extremely high temperature environment, and is part of the venting control of the aft compartment.

  18. Fore–aft translation aftereffects

    PubMed Central

    2012-01-01

    A general theme in sensory perception is that exposure to a stimulus makes it seem more neutral such that perception of subsequent stimuli is shifted in the opposite direction. The visual motion aftereffect (MAE) is an extensively studied example of this. Although similar effects have been described in other sensory systems, it has not previously been described in the vestibular system. Velocity storage has been extensively studied in the vestibular system and suggests a persistence of perception in the direction of the initial movement. The current study sought to determine how motion perception is influenced by prior movement in darkness. Thirteen human subjects (mean age 41, range 21–68) underwent whole-body fore–aft translation. The threshold of vestibular motion discrimination perception was measured using a single interval (1I) of motion lasting 0.5 s in which subjects identified their direction of motion as forward or backward using an adaptive staircase. The translation aftereffect (TAE) was measured in 2-interval (2I) experiments: The adapting stimulus moved 15 cm in 1.5 s (peak velocity 20 cm/s, peak acceleration 42 cm/s2). After a fixed inter-stimulus interval (ISI) of 0.5, 1.0, 1.5, or 3 s, a second stimulus lasting 0.5 s was delivered and the subject identified the perceived direction of the second test stimulus. The test stimulus was determined using an adaptive staircase. The ISI was constant within the block, but adapting stimuli directions were randomly interleaved. During the 1I condition, the response bias was near zero in all subjects. With a 2I stimulus, 8 of 13 subjects demonstrated a significant bias. At an ISI of 0.5 s, a minority of subjects demonstrated a bias in the same direction as the adapter. When the ISI was 1, 1.5, or 3 s, all subjects who demonstrated a significant TAE had one in the opposite direction of the adapter, similar to that seen for MAE. When averaged across subjects, the TAE was significant with ISIs of 1.0 s and

  19. KlAft, the Kluyveromyces lactis Ortholog of Aft1 and Aft2, Mediates Activation of Iron-Responsive Transcription Through the PuCACCC Aft-Type Sequence

    PubMed Central

    Conde e Silva, Natalia; Gonçalves, Isabelle R.; Lemaire, Marc; Lesuisse, Emmanuel; Camadro, Jean Michel; Blaiseau, Pierre Louis

    2009-01-01

    Iron homeostasis in fungi is regulated at the transcriptional level by two different mechanisms. It is mediated by a conserved GATA-type repressor in most fungi except in the yeast Saccharomyces cerevisiae, where it is controlled by the transcription activators Aft1 and Aft2. These activators are encoded by the paralogous genes AFT1 and AFT2, which result from the whole-genome duplication. Here, we explore regulation of iron homeostasis in the yeast Kluyveromyces lactis that diverged from S. cerevisiae before this event. We identify an ortholog of AFT1/AFT2, designated KlAFT, whose deletion leads to the inability to grow under iron limitation. We show with quantitative real-time PCR analysis that KlAft activates the transcription of all homologs of the Aft1-target genes involved in the iron transport at the cell surface in response to iron limitation. However, homologs of Aft2-specific target genes encoding intracellular iron transporters are regulated neither by KlAft nor by iron. Both bioinformatic and DNA binding and transcription analyses demonstrate that KlAft activates iron-responsive gene expression through the PuCACCC Aft-type sequence. Thus, K. lactis is the first documented species with a positive iron-transcriptional control mediated by only one copy of the Aft-type regulator. This indicates that this function was acquired before the whole-genome duplication and was then diversified into two regulators in S. cerevisiae. PMID:19581449

  20. Russians Work on Aft Portion of Zarya

    NASA Technical Reports Server (NTRS)

    1997-01-01

    In this photograph, Russians are working on the aft portion of the United States-funded, Russian-built Functional Cargo Bay (FGB) also known as Zarya (Russian for sunrise). Built at Khrunichev, the FGB began pre-launch testing shortly after this photo was taken. Launched by a Russian Proton rocket from the Baikonu Cosmodrome on November 20, 1998, Zarya was the first element of the International Space Station (ISS) followed by the U.S. Unity Node. The aft docking mechanism, Pirs, on the far right with ventilation ducting rurning through it, will be docked with the third Station element, the Russian Service Module, or Zvezda.

  1. Cold knife cone biopsy

    MedlinePlus

    ... biopsy; Pap smear - cone biopsy; HPV - cone biopsy; Human papilloma virus - cone biopsy; Cervix - cone biopsy; Colposcopy - cone biopsy Images Female reproductive anatomy Cold cone biopsy Cold cone removal References American ...

  2. Tension Builds over AFT Reform Agenda

    ERIC Educational Resources Information Center

    Sawchuk, Stephen

    2012-01-01

    Can a teachers' union successfully be both a hardball-playing defender of its rights and a collaborative force for the common good? It is both a question of philosophy and, increasingly, one of policy direction for the American Federation of Teachers (AFT), whose biennial convention in Detroit showed delegates grappling with the tension between…

  3. AFT Chief Promises Due-Process Reform

    ERIC Educational Resources Information Center

    Sawchuk, Stephen

    2010-01-01

    The president of the American Federation of Teachers (AFT), Randi Weingarten, is putting the sensitive issue of due process on the education reform table, with a pledge to work with districts to streamline the often-cumbersome procedures for dismissing teachers who fail to improve their performance after receiving help and support. She has also…

  4. In Pennsylvania Primary, AFT Hits the Streets

    ERIC Educational Resources Information Center

    Hoff, David J.

    2008-01-01

    Every day, 14 retired teachers and other school employees arrive at the Philadelphia Federation of Teachers' headquarters and go to work for Hillary Rodham Clinton. The retirees--working with volunteers and union staff members from as far away as Alaska--are working to inform teachers' union members why the American Federation of Teachers (AFT)…

  5. 37. View aft of port side of main deck taken ...

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

    37. View aft of port side of main deck taken from just aft of midship house, showing main hatch, mainmast and poop bulkhead. - Ship BALCLUTHA, 2905 Hyde Street Pier, San Francisco, San Francisco County, CA

  6. Spin Forming Aluminum Crew Module (CM) Metallic Aft Pressure Vessel Bulkhead (APVBH) - Phase II

    NASA Technical Reports Server (NTRS)

    Hoffman, Eric K.; Domack, Marcia S.; Torres, Pablo D.; McGill, Preston B.; Tayon, Wesley A.; Bennett, Jay E.; Murphy, Joseph T.

    2015-01-01

    The principal focus of this project was to assist the Multi-Purpose Crew Vehicle (MPCV) program in developing a spin forming fabrication process for manufacture of the Orion crew module (CM) aft pressure vessel bulkhead. The spin forming process will enable a single piece aluminum (Al) alloy 2219 aft bulkhead resulting in the elimination of the current multiple piece welded construction, simplify CM fabrication, and lead to an enhanced design. Phase I (NASA TM-2014-218163, (1)) of this assessment explored spin forming the single-piece CM forward pressure vessel bulkhead. The MPCV Program and Lockheed Martin (LM) recently made two critical decisions relative to the NESC Phase I work scope: (1) LM selected the spin forming process to manufacture a singlepiece aft bulkhead for the Orion CM, and (2) the aft bulkhead will be manufactured from Al 2219. Based on the Program's new emphasis related to the spin forming process, the NESC was asked to conduct a Phase II assessment to assist in the LM manufacture of the aft bulkhead and to conduct a feasibility study into spin forming the Orion CM cone. This activity was approved on June 19, 2013. Dr. Robert Piascik, NASA Technical Fellow for Materials at the Langley Research Center (LaRC), was selected to lead this assessment. The project plan was approved by the NASA Engineering and Safety Center (NESC) Review Board (NRB) on July 18, 2013. The primary stakeholders for this assessment are the NASA and LM MPCV Program offices. Additional benefactors are commercial launch providers developing CM concepts.

  7. Spin Forming Aluminum Crew Module (CM) Metallic Aft Pressure Vessel Bulkhead (APVBH) - Phase II

    NASA Technical Reports Server (NTRS)

    Hoffman, Eric K.; Domack, Marcia S.; Torres, Pablo D.; McGill, Preston B.; Tayon, Wesley A.; Bennett, Jay E.; Murphy, Joseph T.

    2015-01-01

    The principal focus of this project was to assist the Multi-Purpose Crew Vehicle (MPCV) Program in developing a spin forming fabrication process for manufacture of the Orion crew module (CM) aft pressure vessel bulkhead. The spin forming process will enable a single piece aluminum (Al) alloy 2219 aft bulkhead resulting in the elimination of the current multiple piece welded construction, simplify CM fabrication, and lead to an enhanced design. Phase I (NASA TM-2014-218163 (1)) of this assessment explored spin forming the single-piece CM forward pressure vessel bulkhead. The Orion MPCV Program and Lockheed Martin (LM) recently made two critical decisions relative to the NESC Phase I work scope: (1) LM selected the spin forming process to manufacture a single-piece aft bulkhead for the Orion CM, and (2) the aft bulkhead will be manufactured from Al 2219. Based on the Program's new emphasis related to the spin forming process, the NESC was asked to conduct a Phase II assessment to assist in the LM manufacture of the aft bulkhead and to conduct a feasibility study into spin forming the Orion CM cone. This activity was approved on June 19, 2013. Dr. Robert Piascik, NASA Technical Fellow for Materials at the Langley Research Center (LaRC), was selected to lead this assessment. The project plan was approved by the NASA Engineering and Safety Center (NESC) Review Board (NRB) on July 18, 2013. The primary stakeholders for this assessment were the NASA and LM MPCV Program offices. Additional benefactors are commercial launch providers developing CM concepts.

  8. [The EXIT procedure].

    PubMed

    Lehmann, S; Blödow, A; Flügel, W; Renner-Lützkendorf, H; Isbruch, A; Siegling, F; Untch, M; Strauß, J; Bloching, M B

    2013-08-01

    The ex utero intrapartum treatment (EXIT) procedure is used for unborn fetuses in cases of predictable complications of postpartum airway obstruction. Indications for the EXIT procedure are fetal neck tumors, obstruction of the trachea, hiatus hernia of the diaphragm and congenital high airway obstruction syndrome (CHAOS). Large cervical tumors prevent normal delivery of a fetus due to reclination of the head with airway obstruction. Therefore, a primary caesarean section or the EXIT procedure has to be considered. The EXIT procedure has time limitations as the blood supply by the placenta only lasts for 30-60 min. Airway protection has to be ensured during parturition.This article reports the case of an unborn fetus with a large cervical teratoma where an obstruction of the cervical airway was detected and monitored by ultrasound and magnetic resonance imaging (MRI) during pregnancy. The EXIT procedure was therefore used and successfully accomplished. The features of the interdisciplinary aspects of the EXIT procedure are described with the special aspects of each medical discipline.

  9. Acoustic Barrier Facilitates Inlet Noise Measurements for Aft-Dominated Fans

    NASA Technical Reports Server (NTRS)

    1997-01-01

    Noise levels for modern high-bypass-ratio subsonic turbofans tend to be aft dominated. That is, the highest flyover noise levels radiate from the fan exit. Measuring fan inlet sound radiation without aft radiation contamination requires selective suppression of the aft noise. In NASA Lewis Research Center's 9- by 15-Foot Low-Speed Wind Tunnel, an acoustic barrier was used to effectively isolate the inlet noise field for a model of an advanced turbofan. This proof-of-concept test was performed on a model turbofan manufactured for NASA Lewis by the Allison Engine Company as part of the Advanced Subsonic Technology program. The 8-cm-thick acoustic barrier was constructed in sections that were joined upon installation. These sections, which were composed of a wood frame with typically 0.64-cm tempered fiberboard skins, extended from the tunnel's floor to its ceiling and had an axial length of 61 cm. On the fan side of the barrier just downstream of the leading edge, the upstream section had an acoustic treatment--a bulk absorber with a perforated metal skin. It had a nominal full height and an axial length of 46 cm. In addition, an elliptical leading edge was faired into the upstream barrier section. The barrier was mounted on tracks on the tunnel floor and ceiling at a sideline distance of 15 cm from the fan nacelle. Tests were made with the barrier leading edge at the fan inlet highlight plane and 15 cm further aft. The barrier extended downstream essentially to the end of the treated tunnel test section.

  10. Granular flow along the interior surface of rotating cones

    SciTech Connect

    Pitts, J.H.; Walton, O.R.

    1984-04-26

    Relationships are developed between the effective cone half-angle, ..cap alpha../sub eff/, and the actual cone half-angle, ..cap alpha.., for subcritical flow of granular material along the inside surface of a rotating cone. Rotational speed must be high enough to keep the granular material against the wall. If ..cap alpha../sub eff/ is between the wall friction angle, phi/sub w/ and the angle of repose, phi/sub r/, the flowrate may be controlled at the exit and depends on the exit aperture area and the rotational speed. Laboratory experiments show that exit control is possible over the entire range of effective cone half-angles from phi/sub w/ < ..cap alpha../sub eff/ < phi/sub r/ and even beyond these limits. The most uniform thickness of granular material is obtained when the cone half-angle is close to phi/sub r/.

  11. Binocular coordination in fore/aft motion.

    PubMed

    Ramat, Stefano; Zee, David S

    2005-04-01

    Stabilization of images on the fovea during either fore/aft translation of a subject or fore/aft movement of a visual target in front of a stationary observer imposes complex geometrical requirements that depend upon the eccentricity of the object of interest with respect to the eyes. Each eye needs to be rotated independently with varying proportions of conjugate (version) and disconjugate (vergence) eye movements to maintain fixation of the target. Here, we describe binocular coordination in the early response to translational movements of normal subjects along their naso-occipital axis. We recorded the responses evoked by small (about 4 cm), abrupt (about 0.7 g), fore/aft translations in four normal subjects while they viewed a near target. In the forward and backward starting positions the target was 15 or 10.5 cm away, respectively. Each subject was tested with the target centered between the eyes, aligned on the right eye, and placed to the right of the right eye by approximately 3 cm. The three conditions differed only in the lateral eccentricity of the target, yet the geometrical requirements for image stabilization are very different: pure vergence, one eye still, or mostly version. We found that the eye-movement responses closely matched what was needed for visual stabilization of the target, though responses to stimuli calling for divergence were less accurate than those for convergence. The latency of these responses ranged from 40 to 65 ms and achieved about 80% of the ideal response by 90 to 100 ms after the onset of the stimulus. Next, we asked whether these eye movements were generated by the vestibular system or by high-level strategies for image stabilization, such as pursuit. Thus, in a second set of experiments we used the mean profile of fore\\aft body motion computed for each subject to drive a small visual target across the same distances and in the same eccentricities used during body translations. We found that visually driven responses had

  12. B-1 AFT Nacelle Flow Visualization Study

    NASA Technical Reports Server (NTRS)

    Celniker, Robert

    1975-01-01

    A 2-month program was conducted to perform engineering evaluation and design tasks to prepare for visualization and photography of the airflow along the aft portion of the B-1 nacelles and nozzles during flight test. Several methods of visualizing the flow were investigated and compared with respect to cost, impact of the device on the flow patterns, suitability for use in the flight environment, and operability throughout the flight. Data were based on a literature search and discussions with the test personnel. Tufts were selected as the flow visualization device in preference to several other devices studied. A tuft installation pattern has been prepared for the right-hand aft nacelle area of B-1 air vehicle No.2. Flight research programs to develop flow visualization devices other than tufts for use in future testing are recommended. A design study was conducted to select a suitable motion picture camera, to select the camera location, and to prepare engineering drawings sufficient to permit installation of the camera. Ten locations on the air vehicle were evaluated before the selection of the location in the horizontal stabilizer actuator fairing. The considerations included cost, camera angle, available volume, environmental control, flutter impact, and interference with antennas or other instrumentation.

  13. Employee Exit Interviews.

    ERIC Educational Resources Information Center

    Paulk, Larry J.

    1984-01-01

    Describes an exit interview procedure for employees leaving the school system designed to identify potential personnel problems, maintain good employee relations, provide statistics on reasons for turnover, and provide assessment data for inservice education programs. Reports statistical data based on interview implementation, 1981-83. (TE)

  14. Think Exit at Entry

    ERIC Educational Resources Information Center

    O'Rourke, Tom; Satterfield, Coy E.

    2005-01-01

    This paper describes the "Think Exit at Entry" program that has become the guiding principle for the Georgia Department of Juvenile Justice (DJJ). The Georgia DJJ believes that the transition process begins the day the youth enters the system and continues well after release from the institution. Literature points the need for transition…

  15. Bed exit alarms.

    PubMed

    2004-09-01

    Bed-exit alarms alert caregivers that a patient who should not get out of bed unassisted is doing so. These alarms can help reduce the likelihood of falls and can promote speedy assistance to patients who have already fallen. But as we described in our May 2004 Guidance Article on bed-exit alarms, they don't themselves prevent falls. They are only effective if used as part of an overall fall-prevention program and with a clear understanding of their limitations. This Evaluation examines the effectiveness of 16 bed-exit alarms from seven suppliers. Our ratings focus primarily on each product's reliability in detecting bed-exit events and alerting caregivers, its ability to minimize nuisance alarms (alarms that sound even though the patient isn't leaving the bed or that sound while a caregiver is helping the patient to leave the bed), and its resistance to deliberate or inadvertent tampering. Twelve of the products use pressure-sensor-activated alarms (mainly sensor pads placed on or under the mattress); three use a cord that can attach to the patient's garment, alarming if the cord is pulled loose from the control unit; and one is a position-sensitive alarm attached to a leg cuff. All the products reliably detect attempted or successful bed exits. But they vary greatly in how effectively they alert staff, minimize nuisance alarms, and resist tampering. Ease of use and battery performance also vary for many units. Of the pressure-sensor units, three are rated Preferred. Those units meet most of our criteria and have no significant disadvantages. Five of the other pressure-sensor products are Acceptable, and the remaining four are Not Recommended. All three cord-activated alarms are rated Acceptable, as is the patient-worn alarm.

  16. Closeup view of the aft flight deck of the Orbiter ...

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

    Close-up view of the aft flight deck of the Orbiter Discovery looking at the aft center control panels A6, A7, A8, A12, A13, A14, A16 and A17. This View was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  17. AFT No Longer a Major Player in Reform Arena

    ERIC Educational Resources Information Center

    Honawar, Vaishali

    2007-01-01

    The American Federation of Teachers (AFT) has lost several of its most prominent leaders over the past decade. It has struggled with scandals at major locals. An internal survey showed low morale among its own employees. The union itself insists it is still very much on the path blazed by Albert Shanker, the AFT's late, legendary president, under…

  18. General view of the Aft Rocket Motor mated with the ...

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

    General view of the Aft Rocket Motor mated with the External Tank Attach Ring and Aft Skirt Assembly in the process of being mounted onto the Mobile Launch Platform in the Vehicle Assembly Building at Kennedy Space Center. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  19. General view of the Aft Rocket Motor mated with the ...

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

    General view of the Aft Rocket Motor mated with the External Tank Attach Ring and Aft Skirt Assembly being transported from the Rotation Processing and Surge Facility to the Vehicle Assembly Building at Kennedy Space Center. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  20. 46 CFR 171.090 - Aft peak bulkhead.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... if approved by the Commanding Officer, Marine Safety Center. ... PERTAINING TO VESSELS CARRYING PASSENGERS Additional Subdivision Requirements § 171.090 Aft peak bulkhead. (a) Each of the following vessels must have an aft peak bulkhead: (1) Each vessel 100 gross tons or more...

  1. 46 CFR 171.090 - Aft peak bulkhead.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... if approved by the Commanding Officer, Marine Safety Center. ... PERTAINING TO VESSELS CARRYING PASSENGERS Additional Subdivision Requirements § 171.090 Aft peak bulkhead. (a) Each of the following vessels must have an aft peak bulkhead: (1) Each vessel 100 gross tons or more...

  2. SOFIA Optical Design for the Aft Configuration

    NASA Technical Reports Server (NTRS)

    Davis, Paul K.; Melugin, Ramsey K.

    1994-01-01

    The Stratospheric Observatory for Infrared Astronomy (SOFIA) is a planned NASA facility consisting of an infrared telescope of 2.5 meter system aperture flying in a modified Boeing 747. It will have an image diameter of 1.5 arc seconds, an operating wavelength range from visible through 1 millimeter, an 8 arc minute field of view, and a chopping secondary. the configuration is a Cassegrian with a diagonal tertiary to direct the beam to a Nasmyth focus. The new choice of a location aft of the wings allows the primary mirror to have about an f/1.4 focal ratio, which is preferable to f/1.1 previously planned for the forward location.

  3. AFT-QuEST Consortium Yearbook. Proceedings of the AFT-QuEST Consortium (April 22-26, 1973).

    ERIC Educational Resources Information Center

    American Federation of Teachers, Washington, DC.

    This document is a report on the proceedings of the 1973 American Federation of Teachers-Quality Educational Standards in Teaching (AFT-QuEST) consortium sponsored by the AFT. Included in this document are the texts of speeches and outlines of workshops and iscussions. The document is divided into the following sections: goals, major proposals,…

  4. Detail view of the port side of the aft fuselage ...

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

    Detail view of the port side of the aft fuselage of the Orbiter Discovery in the transfer aisle of the Vehicle Assembly Building at Kennedy Space Center with a lifting frame attached to the aft attach points of the orbiter. In this view, the Orbiter Maneuvering/Reaction Control Systems pod is in place. Also note the darker-colored trapezoidal aft fuselage access door and the T-0 umbilical panel to its right in the view. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  5. 90. STARBOARD CATAPULT AFT LOOKING FORWARD SHOWING CROSSHEAD, RAILS, ...

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

    90. STARBOARD CATAPULT - AFT LOOKING FORWARD SHOWING CROSSHEAD, RAILS, RAM CYLINDER, RAM (ON DECK) AND RETRACTING ENGINE SHEAVE IN THE OVERHEAD. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  6. 50. Interior of hold, starboard side looking aft at fresh ...

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

    50. Interior of hold, starboard side looking aft at fresh water tank; note bilge ceiling, hanging knees, and pointer beam; electrical conduit above installed for exhibition lighting - Schooner WAWONA, 1018 Valley Street, Seattle, King County, WA

  7. 116. #2 FIREROOM LOOKING AFT PORT TO STARBOARD SHOWING ...

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

    116. #2 FIREROOM - LOOKING AFT PORT TO STARBOARD SHOWING #4 BOILER FRONT WITH SIX (6) BURNERS, FUEL OIL PIPING, VALVES AND OPEN ACCESS TO FIREBOX. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  8. 101. STARBOARD AIRPLANE ELEVATOR MACHINERY ROOM AFT LOOKING FORWARD ...

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

    101. STARBOARD AIRPLANE ELEVATOR MACHINERY ROOM - AFT LOOKING FORWARD PORT TO STARBOARD SHOWING ELEVATOR ENGINE, LIFTING WIRES, HYDRAULIC PIPING WITH REMOTE OPERATOR. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  9. 80. STARBOARD CATAPULT FORWARD LOOKING AFT SHOWING STATIONARY SHEAVE, ...

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

    80. STARBOARD CATAPULT - FORWARD LOOKING AFT SHOWING STATIONARY SHEAVE, RAILS, RETRACTING ENGINE SHEAVE IN OVERHEAD, VARIOUS HYDRAULIC PIPING WITH SHOCK BENDS AND EXPANSION JOINT. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  10. 50. Oblique view aft of saloon skylight with steering gear ...

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

    50. Oblique view aft of saloon skylight with steering gear beyond, mizzen gaff boom above. Photograph by Russell Booth, June 1989. - Ship BALCLUTHA, 2905 Hyde Street Pier, San Francisco, San Francisco County, CA

  11. 91. CANVAS AND FABRIC WORKSHOP FORWARD LOOKING AFT STARBOARD ...

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

    91. CANVAS AND FABRIC WORKSHOP - FORWARD LOOKING AFT STARBOARD TO PORT SHOWING WOOD WORKTABLE AND HEAVY DUTY SINGER SEWING MACHINE SERIAL #4329. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  12. 97. #2 LAUNDRY AFT LOOKING FORWARD SHOWING LARGE CAPACITY ...

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

    97. #2 LAUNDRY - AFT LOOKING FORWARD SHOWING LARGE CAPACITY WASHER, WASHING MACHINE AND TWO (2) LARGE CAPACITY DRYERS. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  13. 2. VIEW, LOOKING EAST, SHOWING DETAIL OF AFT DEADWOOD AT ...

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

    2. VIEW, LOOKING EAST, SHOWING DETAIL OF AFT DEADWOOD AT STERN Edward Larrabee, photographer, December 1984 - Shooters Island, Ships Graveyard, Vessel No. 84, Newark Bay, Staten Island (subdivision), Richmond County, NY

  14. 18. Windlass capstan, looking aft. Windlass used for tying up ...

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

    18. Windlass capstan, looking aft. Windlass used for tying up as well as raising and lowering boat on starboard side. - U.S. Coast Guard Cutter BRAMBLE, Waterfront at Lincoln Avenue, Port Huron, St. Clair County, MI

  15. 63. View aft along starboard side of hurricane deck from ...

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

    63. View aft along starboard side of hurricane deck from starboard bridge, short stack beyond lifeboat at left of image is donkey boiler stack. - Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

  16. 102. STEERING GEAR ROOM FORWARD LOOKING AFT ON STARBOARD ...

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

    102. STEERING GEAR ROOM - FORWARD LOOKING AFT ON STARBOARD SIDE SHOWING RUDDER POST, HYDRAULIC RAM, EMERGENCY STEERING PUMP PIPING AND REMOTE OPERATING LINKAGE. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  17. 35. VIEW OF MAIN DECK ENGINE FLAT, LOOKING AFT AT ...

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

    35. VIEW OF MAIN DECK ENGINE FLAT, LOOKING AFT AT STEAM CHEST AND CYLINDER HEADS. ORIGINAL STEAM FIRE PUMP IS ON PORT SIDE - Steam Schooner WAPAMA, Kaiser Shipyard No. 3 (Shoal Point), Richmond, Contra Costa County, CA

  18. Crewmembers photographing the Earth from the aft flight deck windows.

    NASA Technical Reports Server (NTRS)

    1992-01-01

    Mission Pilot Mike Baker and Mission Specialist Tamara Jernigan looking out the aft flight deck overhead windows and photographing the Earth below. Jernigan is looking out the window while Baker is photographing with a Hasselblad 70mm camera.

  19. 31. ENGINE ROOM LOOKING AFT ON STARBOARD SIDE SHOWING BOTH ...

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

    31. ENGINE ROOM LOOKING AFT ON STARBOARD SIDE SHOWING BOTH CATERPILLAR DIESELS AND ONE GENERATOR. - U.S. Coast Guard Cutter WHITE PINE, U.S. Coast Guard 8th District Base, South Broad Street, Mobile, Mobile County, AL

  20. General view of the aft, starboard section of the Orbiter ...

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

    General view of the aft, starboard section of the Orbiter Discovery in the Vehicle Assembly Building at NASA's Kennedy Space Center. Note the main engines and Orbiter Maneuvering System/Reaction Control System pods are removed in this photo. The flexible hoses protruding from the starboard aft section are to control temperature, humidity and pressure in the orbiter's void spaces during its down time. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  1. General view of the aft section of the Orbiter Discovery ...

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

    General view of the aft section of the Orbiter Discovery in the Vehicle Assembly Building at NASA's Kennedy Space Center. Note the main engines and Orbiter Maneuvering System/Reaction Control System pods are removed in this photo. The flexible hoses protruding from the starboard aft section are to control temperature, humidity and pressure in the orbiter's void spaces during its down time. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  2. General view of the Aft Solid Rocket Motor Segment mated ...

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

    General view of the Aft Solid Rocket Motor Segment mated with the Aft Skirt Assembly and External Tank Attach Ring in the Rotation Processing and Surge Facility at Kennedy Space Center and awaiting transfer to the Vehicle Assembly Building where it will be mounted onto the Mobile Launch Platform. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  3. Detail view of an Aft Skirt being prepared for mating ...

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

    Detail view of an Aft Skirt being prepared for mating with sub assemblies in the Solid Rocket Booster (SRB) Assembly and Refurbishment Facility at Kennedy Space Center. This detail is showing the four Aft Booster Separation Motors. The Separation Motors burn for one second to ensure the SRBs drift away from the External Tank and Orbiter at separation. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  4. Suit Port Aft Bulkhead Mockup 2008 Test Results

    NASA Technical Reports Server (NTRS)

    Romig, Barbara A.; Allton, Charles S.; Litaker, Harry L.

    2009-01-01

    The Lunar Electric Rover (LER), formerly called the Small Pressurized Rover (SPR), is currently being carried as an integral part of the current Lunar Surface Architectures under consideration in the Constellation program. One element of the LER is the suit port, the means by which the crew performs Extravehicular Activities (EVAs). Two suit port deliverables were produced in fiscal year 2008: an aft bulkhead mockup for functional integrated testing with the 1-G LER mockup and a functional and pressurizable Engineering Unit (EU). This paper focuses on the aft bulkhead mockup test results from Desert Research and Technology Studies (D-RATS) October 2008 testing at Black Point Lava Flow (BPLF), Arizona. Refer to 39th International Conference on Environmental Systems (ICES) for test results of the EU. The suit port aft bulkhead mockup was integrated with the mockup of the LER cabin and chassis. It is located on the aft bulkhead of the LER cabin structure and includes hatches, a locking mechanism, seals, interior and exterior suit don/doff aids, and exterior platforms to accommodate different crewmember heights. A lightweight mockup of the Mark III suit was tested with the suit port aft bulkhead mockup. There are several limitations to the suit port and mockup suits, and results of the suit port evaluation are presented and interpreted within the context of the limitations.

  5. Suit Port Aft Bulkhead Mockup Test Results and Lessons Learned

    NASA Technical Reports Server (NTRS)

    Romig, Barbara A.; Allton, Charles

    2009-01-01

    The Small Pressurized Rover (SPR) is currently being carried as an integral part of the current Lunar Surface Architectures under consideration in the Constellation program. One element of the SPR is the suit port, the means by which the crew performs Extravehicular Activities (EVAs). Two suit port deliverables were produced in fiscal year 2008: an aft bulkhead mockup for functional integrated testing with the 1-G SPR mockup and a functional and pressurizable engineering unit. This paper focuses on the test results and lessons learned on the aft bulkhead mockup. The suit port aft bulkhead mockup was integrated with the mockup of the SPR cabin and chassis. It is located on the aft bulkhead of the SPR cabin structure and includes hatches, a locking mechanism, seals, interior and exterior suit don/doff aids, and exterior platforms to accommodate different crewmember heights. A lightweight mockup of the Mark III suit was tested with the suit port aft bulkhead mockup. There are several limitations to the suit port and mockup suits, and results of the suit port evaluation are presented and interpreted within the context of the limitations.

  6. GENERALIZED CONVEXITY CONES.

    DTIC Science & Technology

    Contents: Introduction The dual cone of C (psi sub 1,..., psi sub n) Extreme rays The cone dual to an intersection of generalized convexity cones... Generalized difference quotients and multivariate convexity Miscellaneous applications of generalized convexity.

  7. Closeup oblique view of the aft fuselage of the Orbiter ...

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

    Close-up oblique view of the aft fuselage of the Orbiter Discovery looking forward and starboard with the Space Shuttle Main Engines (SSME) and Orbiter Maneuvering System/Reaction Control System pods removed. The openings for the SSMEs have been covered with a flexible barrier to create a positive pressure envelope inside of the aft fuselage. This image was taken inside the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  8. Detail view of the starboard side of the aft fuselage ...

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

    Detail view of the starboard side of the aft fuselage of the Orbiter Discovery in the Orbiter Processing Facility at Kennedy Space Center with the Orbiter Maneuvering/Reaction Control Systems Pod removed and exposing the insulating foil used to protect the orbiter structure from the heat generated by the maneuvering and reaction control engines. Also note in the view that the aft fuselage access door has bee removed and also note the ground support equipment attached to the T-0 umbilical plate in the lower left of the view. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  9. Closeup oblique view of the aft fuselage of the Orbiter ...

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

    Close-up oblique view of the aft fuselage of the Orbiter Discovery looking forward and port with the Space Shuttle Main Engines (SSME) and Orbiter Maneuvering System/Reaction Control System pods still in place. However. the heat shields have been removed from the SSMEs providing a good view toward the interior of the aft fuselage. This image was taken inside the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  10. Closeup oblique view of the aft fuselage of the Orbiter ...

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

    Close-up oblique view of the aft fuselage of the Orbiter Discovery looking forward and starboard with the Space Shuttle Main Engines (SSME) and Orbiter Maneuvering System/Reaction Control System pods still in place. However. the heat shields have been removed from the SSMEs providing a good view toward the interior of the aft fuselage. This image was taken inside the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  11. General view looking aft from the starboard side of the ...

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

    General view looking aft from the starboard side of the Orbiter Discovery looking into the payload bay and the bulkhead of the aft fuselage. Note that the Orbiter Boom Sensor System is still attached while the Remote Manipulator System has been removed. Also note the suspended protective panels and walkways in place to protect the interior surfaces of the payload bay doors while in their open position. This view was taken from a service platform in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  12. Closeup view of an Aft Skirt being prepared for mating ...

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

    Close-up view of an Aft Skirt being prepared for mating with sub assemblies in the Solid Rocket Booster (SRB) Assembly and Refurbishment Facility at Kennedy Space Center. The most prominent feature in this view are the four Aft Booster Separation Motors on the left side of the skirt in this view. The Separation Motors burn for one second to ensure the SRBs drift away from the External Tank and Orbiter at separation. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  13. 14 CFR 23.807 - Emergency exits.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... with canopies, at least one emergency exit on the opposite side of the cabin from the main door... persons using that exit. (b) Type and operation. Emergency exits must be movable windows, panels,...

  14. 14 CFR 23.807 - Emergency exits.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... with canopies, at least one emergency exit on the opposite side of the cabin from the main door... persons using that exit. (b) Type and operation. Emergency exits must be movable windows, panels,...

  15. 14 CFR 23.807 - Emergency exits.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... with canopies, at least one emergency exit on the opposite side of the cabin from the main door... persons using that exit. (b) Type and operation. Emergency exits must be movable windows, panels,...

  16. 14 CFR 23.807 - Emergency exits.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... with canopies, at least one emergency exit on the opposite side of the cabin from the main door... persons using that exit. (b) Type and operation. Emergency exits must be movable windows, panels,...

  17. Exit Times from Equilateral Triangles

    SciTech Connect

    Alabert, Aureli Farre, Merce Roy, Rahul

    2003-12-15

    In this paper we obtain a closed form expression of the expected exit time of a Brownian motion from equilateral triangles. We consider first the analogous problem for a symmetric random walk on the triangular lattice and show that it is equivalent to the ruin problem of an appropriate three player game. A suitable scaling of this random walk allows us to exhibit explicitly the relation between the respective exit times. This gives us the solution of the related Poisson equation.

  18. 30. View of main deck at bow (looking aft from ...

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

    30. View of main deck at bow (looking aft from samson post, upper deck removed), showing anchor windlass (left foreground), head (right foregound), and forward deckhouse; weather canopy overhead not an original or permanent feature - Schooner WAWONA, 1018 Valley Street, Seattle, King County, WA

  19. 27. VIEW LOOKING AFT ON STARBOARD SIDE OF MAIN DECK ...

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

    27. VIEW LOOKING AFT ON STARBOARD SIDE OF MAIN DECK WITH TENDER ANNIE RUTH ALONGSIDE. COVER OF FORWARD COMPANIONWAY HAS BEEN PLACED ON MAIN DECK; SUN AWNING A TYPICAL FEATURE IN TROPICAL CLIMATES. CREW MEMBERS UNKNOWN Original 4-3/4'x6-3/4' photograph taken c. 1930? - Pilot Schooner "Alabama", Moored in harbor at Vineyard Haven, Vineyard Haven, Dukes County, MA

  20. 100. COBBLER SHOP AFT LOOKING FORWARD VISIBLE ARE ...

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

    100. COBBLER SHOP - AFT LOOKING FORWARD - VISIBLE ARE THE FINISHING MACHINE, DAVIS STITCHING MACHINE, SINGER SEWING MACHINE FROM TAILOR SHOP, STORAGE SHELVES, WORK BENCH AND SHOE TREE STAND. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  1. Plans: Aft Gun Platform, Quarters for 16 Gunmen, Poop Deck, ...

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

    Plans: Aft Gun Platform, Quarters for 16 Gunmen, Poop Deck, Boat Deck, House Top, Bridge Deck, Upper Bridge Deck, Navigating Bridge, Forecastle Deck, Gun Platform, Upper Deck, Second Deck and Hold Plan - Mission Santa Ynez, Suisun Bay Reserve Fleet, Benicia, Solano County, CA

  2. 34. PRIMARY FLIGHT CONTROL STATION AFT LOOKING FORWARD ON ...

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

    34. PRIMARY FLIGHT CONTROL STATION - AFT LOOKING FORWARD ON PORT SIDE SHOWING FLIGHT DECK LIGHTING BOARD, ARRESTING GEAR CONTROL CONSOLE AND FRESNEL LENS OPTICAL LANDING SYSTEM. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  3. General view of the aft Flight Deck looking at the ...

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

    General view of the aft Flight Deck looking at the mission specialist seats directly behind and to the side of the commander and pilot's seats. These seats are removed, packed and stowed during on-orbit activities. This image was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  4. 92. STARBOARD CATAPULT HYDRAULIC MANIFOLD FORWARD LOOKING AFT SHOWING ...

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

    92. STARBOARD CATAPULT HYDRAULIC MANIFOLD - FORWARD LOOKING AFT SHOWING THE SEVEN (7) DISCHARGE LINES FROM THE SEVEN (7) HYDRAULIC PUMPS THROUGH SHUT-OFF VALVES TO ACCUMULATOR TANKS. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  5. Closeup view of the mid deck aft wall of the ...

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

    Close-up view of the mid deck aft wall of the Orbiter Discovery showing a mission specific configuration of stowage lockers within the modular system designed for maximum flexibility. This photograph was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  6. VIEW NORTH FROM THE AFT (FANTAIL) SECTION OF THE MEMORIAL, ...

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

    VIEW NORTH FROM THE AFT (FANTAIL) SECTION OF THE MEMORIAL, LOOKING FORWARD TOWARD THE STACK AND BOW SECTIONS - Rosie the Riveter National Historical Park, Rosie the Riveter Memorial, Off Regatta at Melville Square in Marina Park, Richmond, Contra Costa County, CA

  7. 12. INTERIOR VIEW OF COUNTER, LOOKING AFT AT STERNPOST AND ...

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

    12. INTERIOR VIEW OF COUNTER, LOOKING AFT AT STERNPOST AND STERNPOST KNEE (ON WHICH STICK RULE IS LYING). FRESH WATER TANKS APPEAR TO EITHER SIDE OF STERNPOST; SMALL TANK SUSPENDED FROM DECK IN CENTER OF VIEW IS AN AIR RESERVOIR FOR ENGINES' PNEUMATIC CONTROL SYSTEM - Pilot Schooner "Alabama", Moored in harbor at Vineyard Haven, Vineyard Haven, Dukes County, MA

  8. 12. VIEW AFT IN MAIN HOLD OF THE EVELINA M. ...

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

    12. VIEW AFT IN MAIN HOLD OF THE EVELINA M. GOULART. OPENING IN THE BULKHEAD WAS CUT TO IMPROVE ACCESS TO ENGINE ROOM SO THAT ENGINE COULD BE REMOVED. - Auxiliary Fishing Schooner "Evelina M. Goulart", Essex Shipbuilding Museum, 66 Main Street, Essex, Essex County, MA

  9. 18. VIEW AFT INTO ENGINE ROOM AND UP INTO CAPTAIN'S ...

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

    18. VIEW AFT INTO ENGINE ROOM AND UP INTO CAPTAIN'S CABIN. THE AFTER BULKHEAD OF THE ENGINE ROOM WAS REMOVED WHEN THE ENGINE WAS SALVAGED. ENGINE BED AND GEARBOX ARE REMNANTS OF THE ENGINE INSTALLATION. CABLES AND CHAINS ARE IN PLACE TO HELP STABILIZE THE HULL AND TRANSOM. - Auxiliary Fishing Schooner "Evelina M. Goulart", Essex Shipbuilding Museum, 66 Main Street, Essex, Essex County, MA

  10. 11. Forward machinery space looking aft toward starboard side, showing ...

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

    11. Forward machinery space looking aft toward starboard side, showing blower engine in foreground with belt running to blower. Steering engine lies in background; note sheave for port side steering cable in upper right hand corner of view. - Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

  11. 65. FORWARD EMERGENCY DIESEL GENERATOR SET AFT LOOKING FORWARD ...

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

    65. FORWARD EMERGENCY DIESEL GENERATOR SET - AFT LOOKING FORWARD SHOWING TOP HALF OF FAIRBANKS MORSE 36D81/8 TEN CYLINDER DIESEL ENGINE SERIAL #951230 AND EXHAUST SYSTEM. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  12. Wardroom staterooms, officer's country, view forward to aft showing barbette ...

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

    Wardroom staterooms, officer's country, view forward to aft showing barbette on right of photograph, original wood ladder to main deck, heating system radiator on left and officer's stateroom doors. (088) - USS Olympia, Penn's Landing, 211 South Columbus Boulevard, Philadelphia, Philadelphia County, PA

  13. 108. #1 ENGINE ROOM FORWARD AFT CENTERLINE TO STARBOARD ...

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

    108. #1 ENGINE ROOM - FORWARD AFT CENTERLINE TO STARBOARD SHOWING #1 REDUCTION GEAR BUILT BY WESTINGHOUSE SERIAL # 1-A-9638-13 WITH A REDUCTION OF HIGH PRESSURE 20,908 AND LOW PRESSURE 16,226. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  14. 109. #1 ENGINE ROOM FORWARD LOOKING AFT SHOWING #4 ...

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

    109. #1 ENGINE ROOM - FORWARD LOOKING AFT SHOWING #4 LOW PRESSURE TURBINE BUILT BY WESTINGHOUSE SHAFT HORSEPOWER 19,800, RPM 4301, STEAM PRESSURE 371/2 LB.G., SERIAL #I-A-9636-14. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  15. 25. HANGAR BAY #3 AFT LOOKING FORWARD ON CENTERLINE ...

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

    25. HANGAR BAY #3 - AFT LOOKING FORWARD ON CENTERLINE - STARBOARD SIDE SHOWING AFTER BROW, ELEVATOR DOORS, FOG FOAM STATION #7, AND DEHUMIDIFICATION MACHINES. PORT SIDE SHOWING SCUPPER COVERS, LIFE JACKET BIN #16, PARTS STOREROOM, HATCH AND LADDERWAY TO GALLERY DECK. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  16. 96. View aft, port side, from just forward of the ...

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

    96. View aft, port side, from just forward of the mizzenmast. Cans in foreground store Fluid Film, used to protect structural steel below waterline from oxidation. Sails stored on shelving in background have since been moved to Museum Storage. - Ship BALCLUTHA, 2905 Hyde Street Pier, San Francisco, San Francisco County, CA

  17. General view looking aft along the starboard side of the ...

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

    General view looking aft along the starboard side of the Orbiter Discovery in the Vehicle Assembly Building at NASA's Kennedy Space Center. This view shows a close up view of the reinforced carbon-carbon leading edge of the Orbiter wing. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  18. 23. FORWARD PUMP ROOM LOOKING AFT AT OIL TANK BULKHEAD. ...

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

    23. FORWARD PUMP ROOM LOOKING AFT AT OIL TANK BULKHEAD. FROM LEFT TO RIGHT ARE FIRE AND BILGE PUMP (LEFT BACKGROUND), BALLAST PUMP, AND CARGO OIL PUMP. - Ship "Falls of Clyde", Hawaii Maritime Center,Pier 7, Honolulu, Honolulu County, HI

  19. 41. #1 ARRESTING GEAR ENGINE AFT LOOKING FORWARD PORT ...

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

    41. #1 ARRESTING GEAR ENGINE - AFT LOOKING FORWARD PORT TO STARBOARD SHOWING ARRESTING GEAR ENGINE ACCUMULATOR, AIR FLASK, CONTROL VALVE, WITH CONTROL RAM, SHEAVES AND WIRES UNDERNEATH ENGINE STAND. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  20. 119. #3 SHAFT ALLEY AFT LOOKING FORWARD ON STARBOARD ...

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

    119. #3 SHAFT ALLEY - AFT LOOKING FORWARD ON STARBOARD SIDE SHOWING #3 SHAFT COUPLING WITH LOCKING DEVICE INSTALLED, SHAFT SPRING BEARING, SHAFT SEAL COOLING WATER LINE, FIVE INCH FIRE MAIN AND BALLASTING MANIFOLD. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  1. 25. Hot well, as seen from port side aft. Waste ...

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

    25. Hot well, as seen from port side aft. Waste water overflow pipe appears at left, behind which is bilge pump. At base of hot well on either side are reciprocating boiler feedwater pumps driven from hot well crosshead. (Labels were applied by HAER recording team and are not original to equipment.) - Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

  2. 28. VIEW LOOKING AFT ON STARBOARD SIDE OF MAIN DECK ...

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

    28. VIEW LOOKING AFT ON STARBOARD SIDE OF MAIN DECK FROM POINT ALONGSIDE WINDLASS. SUN AWNING APPEARS TO HAVE BEEN FASHIONED FROM VESSEL'S SAILS. CREW MEMBERS UNKNOWN Original 4-3/4'x6-3/4' photograph taken c. 1930? - Pilot Schooner "Alabama", Moored in harbor at Vineyard Haven, Vineyard Haven, Dukes County, MA

  3. 118. #3 SHAFT ALLEY (PROPELLER SHAFT) FORWARD LOOKING AFT ...

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

    118. #3 SHAFT ALLEY (PROPELLER SHAFT) - FORWARD LOOKING AFT ON PORT SIDE SHOWING THE SHAFT, SHAFT PACKING GLAND, SHAFT SEAL COOLING WATER LINE AND FIVE INCH FIRE MAIN PIPING. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  4. 73. TORPEDO WORK SHOP FORWARD LOOKING AFT SHOWING TORPEDO ...

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

    73. TORPEDO WORK SHOP - FORWARD LOOKING AFT SHOWING TORPEDO ELEVATOR, HIGH PRESSURE AIR REDUCING STATION, SCUTTLEBUTT, TORPEDO AFTERBODY WORKSHOP, OVERHEAD CHAIN MOIST AND RAIL SYSTEM AND OVERHEAD SPRINKLER SYSTEM. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  5. An investigation of the effects of aft blowing on a 3.0 caliber tangent ogive body at high angles of attack. M.S. Thesis

    NASA Technical Reports Server (NTRS)

    Gittner, Nathan M.

    1992-01-01

    An experimental investigation of the effects of aft blowing on the asymmetric vortex flow of a slender, axisymmetric body at high angles of attack was conducted. A 3.0 caliber tangent ogive body fitted with a cylindrical afterbody was tested in a wind tunnel under subsonic, laminar flow test conditions. Asymmetric blowing from both a single nozzle and a double nozzle configuration, positioned near the body apex, was investigated. Aft blowing was observed to alter the vortex asymmetry by moving the blowing-side vortex closer to the body surface while moving the non-blowing-side vortex further away from the body. The effect of increasing the blowing coefficient was to move the blowing-side vortex closer to the body surface at a more upstream location. The data also showed that blowing was more effective in altering the initial vortex asymmetry at the higher angles of attack than at the lower. The effects of changing the nozzle exit geometry were investigated and it was observed that blowing from a nozzle with a low, broad exit geometry was more effective in reducing the vortex asymmetry than blowing from a high, narrow exit geometry.

  6. Clearance Analysis of Node 3 Aft CBM to the Stowed FGB Solar Array

    NASA Technical Reports Server (NTRS)

    Liddle, Donn

    2014-01-01

    In early 2011, the ISS Vehicle Configuration Office began considering the relocation of the Permanent Multipurpose Module (PMM) to the aft facing Common Berthing Mechanism (CBM) on Node 3 to open a berthing location for visiting vehicles on the Node 1 nadir CBM. In this position, computer-aided design (CAD) models indicated that the aft end of the PMM would be only a few inches from the stowed Functional Cargo Block (FGB) port solar array. To validate the CAD model clearance analysis, in the late summer of 2011 the Image Science and Analysis Group (ISAG) was asked to determine the true geometric relationship between the on-orbit aft facing Node 3 CBM and the FGB port solar array. The desired measurements could be computed easily by photogrammetric analysis if current imagery of the ISS hardware were obtained. Beginning in the fall of 2011, ISAG used the Dynamic Onboard Ubiquitous Graphics (DOUG) program to design a way to acquire imagery of the aft face of Node 3, the aft end-cone of Node 1, the port side of pressurized mating adapter 1 (PMA1), and the port side of the FGB out to the tip of the port solar array using cameras on the Space Station Remote Manipulator System (SSRMS). This was complicated by the need to thread the SSRMS under the truss, past Node 3 and the Cupola, and into the space between the aft side of Node 3 and the FGB solar array to acquire more than 100 images from multiple positions. To minimize the number of SSRMS movements, the Special Purpose Dexterous Manipulator (SPDM) would be attached to the SSRMS. This would make it possible to park the SPDM in one position and acquire multiple images by changing the viewing orientation of the SPDM body cameras using the pan/tilt units on which the cameras are mounted. Using this implementation concept, ISAG identified four SSRMS/SPDM positions from which all of the needed imagery could be acquired. Based on a photogrammetric simulation, it was estimated that the location of the FGB solar array could be

  7. 77 FR 5420 - Airworthiness Directives; Aeronautical Accessories Inc. High Landing Gear Aft Crosstube Assembly

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-03

    ... Accessories Inc. High Landing Gear Aft Crosstube Assembly AGENCY: Federal Aviation Administration (FAA), DOT... (AD) for the Aeronautical Accessories Inc. (AAI) High Landing Gear Aft Crosstube Assembly (aft... proposed actions are intended to prevent failure of a crosstube, collapse of the landing gear,...

  8. Comparative Study of Aerodynamic Interference During AFT Dispense of Munitions

    DTIC Science & Technology

    2007-09-01

    includes both a computational and an experimental portion to complete the study. The commercial tools Gridgen , SolidMesh, SolidWorks and Fluent...redesigned strut shown in Figure 3.5 was initially generated in Gridgen , a commercial Original Cone Model: 10° half-angle cone 0.5 mm spherical tip Dia...not be overloaded. The software package Gridgen was used to develop the database structures and create custom grids. The original strut, cone and

  9. 14 CFR 25.807 - Emergency exits.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    .... Type II exits must be floor-level exits unless located over the wing, in which case they must not have... Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS... exits. (a) Type. For the purpose of this part, the types of exits are defined as follows: (1) Type...

  10. Closeup view of the interior of an Aft Skirt being ...

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

    Close-up view of the interior of an Aft Skirt being tested and prepared for mating with sub assemblies in the Solid Rocket Booster (SRB) Assembly and Refurbishment Facility at Kennedy Space Center. This view is showing the SRB Thrust Vector Control (TVC) System which includes independent auxiliary power units for each actuator to pressurize their respective hydraulic systems. When the Nozzle is mated with the Aft Skirt the two actuators, located on the left and right side of the TVC System in this view, can swivel it up to 3.5 degrees to redirect the thrust to steer and maintain the Shuttle's programmed trajectory. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  11. Closeup view looking aft from the starboard side of the ...

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

    Close-up view looking aft from the starboard side of the Orbiter Discovery looking into the payload bay and the bulkhead of the aft fuselage. Note the vertical stabilizer protruding slightly from beyond the clear sheeting used to keep positive pressure in the mid-fuselage and payload bay area during servicing. Note that the Orbiter Boom Sensor System is still attached while the Remote Manipulator System has been removed. Also note the suspended protective panels and walkways in place to protect the interior surfaces of the payload bay doors while in their open position. This view was taken from a service platform in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  12. General view looking aft from the starboard side of the ...

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

    General view looking aft from the starboard side of the mid fuselage of the Orbiter Discovery. This view has a close-up view of the remote sensor boom and its retention mechanisms at its attach points to the starboard longeron. This photograph was taken in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  13. Detailed view inside the aft fuselage of the Orbiter Discovery ...

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

    Detailed view inside the aft fuselage of the Orbiter Discovery showing the network of supply, distribution and feed lines to deliver fuel, oxidizer and other vital gasses and fluids to the Space Shuttle Main Engines (SSMEs). This photograph was taken in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  14. General view of the aft fuselage of the Orbiter Discovery ...

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

    General view of the aft fuselage of the Orbiter Discovery looking forward showing Space Shuttle Main Engines (SSMEs) installed in positions one and three and an SSME on the process of being installed in position two. This photograph was taken in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  15. MD-80 aft cabin noise control: A case history

    NASA Technical Reports Server (NTRS)

    Lang, M. A.; Lorch, D. R.; May, D. N.; Simpson, M. A.

    1992-01-01

    The interior noise technology program to improve the noise environment in the aft cabin of the MD-80 twin jet aircraft is discussed. Two potential noise control treatments were identified: vibration absorber devices for the airframe and for the engine. A series of ground and flight tests using in-service aircraft was then conducted. These tests showed that the vibration absorbers for the airframe and engine decreased aircraft noise significantly.

  16. MD-80 aft cabin noise control: A case history

    NASA Astrophysics Data System (ADS)

    Lang, M. A.; Lorch, D. R.; May, D. N.; Simpson, M. A.

    1992-07-01

    The interior noise technology program to improve the noise environment in the aft cabin of the MD-80 twin jet aircraft is discussed. Two potential noise control treatments were identified: vibration absorber devices for the airframe and for the engine. A series of ground and flight tests using in-service aircraft was then conducted. These tests showed that the vibration absorbers for the airframe and engine decreased aircraft noise significantly.

  17. Closeup view of an Aft Skirt being prepared for mating ...

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

    Close-up view of an Aft Skirt being prepared for mating with sub assemblies in the Solid Rocket Booster Assembly and Refurbishment Facility at Kennedy Space Center. The most prominent feature in this view are the six Thrust Vector Control System access ports, three per hydraulic actuator. - Space Transportation System, Solid Rocket Boosters, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  18. 11. VIEW FROM JUST AFT OF THE KING POST IN ...

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

    11. VIEW FROM JUST AFT OF THE KING POST IN THE FOC'S'LE OF THE EVELINA M. GOULART. FIRE EXTINGUISHER IS MOUNTED ON STUB OF FOREMAST. OBJECT AT LOWER LEFT IS A FOLDING MESS TABLE. LADDER LEADS TO DECK. CABINET AT RIGHT CENTER HOUSED SINK FOR CLEAN-UP AND COOKING. A SMALL CHINA SINK AT RIGHT CENTER SERVED FOR PERSONAL CLEAN-UP AND SHAVING. - Auxiliary Fishing Schooner "Evelina M. Goulart", Essex Shipbuilding Museum, 66 Main Street, Essex, Essex County, MA

  19. Astronaut Susan Helms on aft flight deck with RMS controls

    NASA Technical Reports Server (NTRS)

    1994-01-01

    On the Space Shuttle Discovery's aft flight deck, astronaut Susan J. Helms handles controls for the Remote Manipulator System (RMS). The robot arm operated by Helms, who remained inside the cabin, was used to support task such as the release and retrieval of the free-flying Shuttle Pointed Autonomous Research Tool for Astronomy (SPARTAN) - 201, a six-hour space walk and the Shuttle Plume Impingement Flight Experiment (SPIFEX).

  20. Closeup view of the payload bay side of the aft ...

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

    Close-up view of the payload bay side of the aft fuselage bulkhead of the Orbiter Discovery. This image has a detailed portions of the Remote Manipulator System and the Orbiter Maneuvering System/Reaction Control System Pods. This photograph wa taken in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  1. Oblique view at ground level looking at the aft and ...

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

    Oblique view at ground level looking at the aft and port side of the Orbiter Discovery in the Vehicle Assembly Building at NASA's Kennedy Space Center. Note that the Orbiter Maneuvering System/Reaction Control System pods and the Shuttle Main Engines are removed in this image. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  2. Astronauts Hoffman and Musgrave pose in aft flight deck

    NASA Technical Reports Server (NTRS)

    1993-01-01

    Two of Endeavour's busy team of astronauts share a rare moment of leisure in the aft flight deck captured by an Electronic Still Camera (ESC). Astronauts Jeffrey A. Hoffman, left, and F. Story Musgrave also are sharing three of the mission's five planned sessions of extravehicular activity (EVA). Electronic still photography is a technology which provides the means for a handheld camera to electronically capture and digitize an image with resolution approaching film quality.

  3. View looking aft along the starboard side of the midfuselage ...

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

    View looking aft along the starboard side of the mid-fuselage of the Orbiter Discovery. This view shows the wing profile as it intersects with the fuselage. Also note in the foreground the panels protecting the Reinforced Carbon-Carbon leading edge of the wing. This view was taken from the service platform in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  4. Closeup view of the payload bay side of the aft ...

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

    Close-up view of the payload bay side of the aft crew compartment bulkhead of the Orbiter Discovery. Showing the airlock, the beam-truss attach structure supporting it and its attach points to the payload bay sill longerons. This photograph was taken in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  5. 13. Coal ejectors mounted on aft bulkhead of coal bunker. ...

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

    13. Coal ejectors mounted on aft bulkhead of coal bunker. Ejectors were used to flush overboard live coals and clinkers from firebed (pipe for carrying coals overboard has been removed from ejector in foreground). Coal doors from bunker appear beside ejector in foreground). Coal doors from bunker appear beside ejectors at deck; note firing shovels in background against hull. - Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

  6. Autogenic-Feedback Training Exercise (AFTE) Method and System

    NASA Technical Reports Server (NTRS)

    Cowings, Patricia S. (Inventor)

    1997-01-01

    The Autogenic-Feedback Training Exercise (AFTE) method of the present invention is a combined application of physiologic and perceptual training techniques. such as autogenic therapy and biofeedback. This combined therapy approach produces a methodology that is appreciably more effective than either of the individual techniques used separately. The AFTE method enables sufficient magnitude of control necessary to significantly reduce the behavioral and physiologic reactions to severe environmental stressors. It produces learned effects that are persistent over time and are resistant to extinction and it can be administered in a short period of time. The AFTE method may be used efficiently in several applications, among which are the following: to improve pilot and crew performance during emergency flying conditions; to train people to prevent the occurrence of nausea and vomiting associated with motion and sea sickness, or morning sickness in early pregnancy; as a training method for preventing or counteracting air-sickness symptoms in high-performance military aircraft; for use as a method for cardiovascular training, as well as for multiple other autonomic responses, which may contribute to the alleviation of Space Motion Sickness (SMS) in astronauts and cosmonauts; training people suffering from migraine or tension headaches to control peripheral blood flow and reduce forehead and/or trapezius muscle tension; training elderly people suffering from fecal incontinence to control their sphincter muscles; training cancer patients to reduce the nauseagenic effects of chemotherapy; and training patients with Chronic Intestinal Pseudo-obstruction (CIP).

  7. Active Fish Tracking Sonar (AFTS) for Assessing Fish Behavior

    SciTech Connect

    Hedgepeth, J; Johnson, Gary E. ); Skalski, John R.; Burczynski, J

    2002-11-01

    Active fish tracking sonars (AFTS) were used in 2001 to study fish movement in response to intake occlusion plates at The Dalles Dam on the Columbia River. AFTS provides three-dimensional fish tracks by aligning the axis of a split-beam transducer with a fish target. High-speed stepper motors move the transducer so that a tracked target remains on-axis. Occlusion plates with lateral extensions covered the top half of the turbine intakes to produce a fish friendly near-dam environment. Two AFTS were positioned at the center of Main Unit 1, one each for monitoring installed and removed plate conditions. A regression analysis showed that occlusion plates had pronounced effects on fish movement along the dam. The plates appeared to inhibit movement toward the spillway, movement toward the dam (especially in front of the turbine intake), and movement downward toward the turbines. Fish fate (as opposed to movement directions from regression slopes) into particular areas was determined using Markov-chain analysis. The sluiceway (a safer passage route above the turbine intake) zone of influence was larger with the occlusion plates installed, contrary to the regression results. In addition, the probability of passage out the near turbine and bottom sides of the sample volume was about 50% lower with occlusion plates installed.

  8. The Exit Interview for Graduating Seniors.

    ERIC Educational Resources Information Center

    Doll, Paddy A.; Jacobs, Keith W.

    1988-01-01

    Reviews the practice of holding exit interviews with graduating psychology students at Loyola University (Louisiana). Discusses the benefits and limitations of exit interviews, stating that they provide unique data unavailable from other sources. (GEA)

  9. 14 CFR 121.585 - Exit seating.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... operations, written procedures established for making determinations in regard to exit row seating. (g) No... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Exit seating. 121.585 Section 121.585..., FLAG, AND SUPPLEMENTAL OPERATIONS Flight Operations § 121.585 Exit seating. (a)(1) Each...

  10. 14 CFR 121.585 - Exit seating.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... operations, written procedures established for making determinations in regard to exit row seating. (g) No... 14 Aeronautics and Space 3 2012-01-01 2012-01-01 false Exit seating. 121.585 Section 121.585..., FLAG, AND SUPPLEMENTAL OPERATIONS Flight Operations § 121.585 Exit seating. (a)(1) Each...

  11. Exit Exam as Academic Performance Indicator

    ERIC Educational Resources Information Center

    Al Ahmad, Mahmoud; Al Marzouqi, Ali H.; Hussien, Mousa

    2014-01-01

    This paper focuses on the impact of exit exams on different elements of the educational process, namely: curriculum development, students and instructors. A 50-question multiple-choice Exit Exam was prepared by Electrical Engineering (EE) faculty members covering a poll of questions from EE core courses. A copy of the Exit Exam applied during each…

  12. 14 CFR 25.807 - Emergency exits.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... STANDARDS: TRANSPORT CATEGORY AIRPLANES Design and Construction Emergency Provisions § 25.807 Emergency.... Type II exits must be floor-level exits unless located over the wing, in which case they must not have... not more than 20 inches. If the exit is located over the wing, the step-down outside the airplane...

  13. 14 CFR 25.807 - Emergency exits.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... STANDARDS: TRANSPORT CATEGORY AIRPLANES Design and Construction Emergency Provisions § 25.807 Emergency.... Type II exits must be floor-level exits unless located over the wing, in which case they must not have... not more than 20 inches. If the exit is located over the wing, the step-down outside the airplane...

  14. 14 CFR 25.807 - Emergency exits.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... STANDARDS: TRANSPORT CATEGORY AIRPLANES Design and Construction Emergency Provisions § 25.807 Emergency.... Type II exits must be floor-level exits unless located over the wing, in which case they must not have... not more than 20 inches. If the exit is located over the wing, the step-down outside the airplane...

  15. Ideal illuminants for rod/L-cone color

    NASA Astrophysics Data System (ADS)

    McCann, John J.

    2006-01-01

    Humans see multicolor complex images with illuminants that have very low amounts of 400 to 580nm light when there is enough long-wave light greater than 590nm. Interactions between rods and long-wave (L) cones generate these colors. They are observed when there is insufficient light for a threshold response from M- and S-cones. This paper measures the spectral emission of a wood fire and a wax candle and it compares these low-color temperature spectral radiant exitances with the sensitivities of rods and long-wave cones. The paper reviews some of the literature on the evolution of human cone pigments and the early use of fire by hominids.

  16. Closeup view of the aft fuselage looking forward along the ...

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

    Close-up view of the aft fuselage looking forward along the approximate centerline of the Orbiter Discovery looking at the expansion nozzles of the Space Shuttle Main Engines (SSME) and the Orbiter Maneuvering System. Also in the view is the orbiter's body flap with a protective covering over the High-temperature Reusable Surface Insulation tiles on the surface facing the SSMEs. This image was taken inside the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  17. 27. VIEW FROM AFT OF MAIN HOISTING ENGINE WITH HOISTING ...

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

    27. VIEW FROM AFT OF MAIN HOISTING ENGINE WITH HOISTING DRUM IN FOREGROUND. NOTE MAIN HOISTING DRUM IS A STEP DRUM, WITH TWO DIAMETERS ON DRUM. WHEN BUCKET IS IN WATER THE CABLE IS ON THE SMALLER STEP, AS PICTURED, GIVING MORE POWER TO THE LINE. THE CABLE STEPS TO LARGER DIAMETER WHEN BUCKET IS OUT OF WATER, WHERE SPEED IS MORE IMPORTANT THAN POWER. SMALLER BACKING DRUM IN BACKGROUND. - Dredge CINCINNATI, Docked on Ohio River at foot of Lighthill Street, Pittsburgh, Allegheny County, PA

  18. Closeup view of the aft fuselage of the Orbiter Discovery ...

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

    Close-up view of the aft fuselage of the Orbiter Discovery on the starboard side looking forward. This view is of the attach surface for the Orbiter Maneuvering System/Reaction Control System (OMS/RCS) Pod. The OMS/RCS pods are removed for processing and reconditioning at another facility. This view was taken from a service platform in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  19. Detail view of the aft section, port side, of the ...

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

    Detail view of the aft section, port side, of the Orbiter Discovery from an elevated platform in the Vehicle Assembly Building at NASA's Kennedy Space Center. Note the removed Orbiter Maneuvering System/Reaction Control System pod from the base of the vertical stabilizer the strongback ground-support equipment attached to the payload bay door. This view is also a good view of the leading edge and top surface of the Orbiter wing. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  20. 13. CLOSEUP OF AFT BULKHEAD IN THE MAIN HOLD. HORIZONTAL ...

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

    13. CLOSE-UP OF AFT BULKHEAD IN THE MAIN HOLD. HORIZONTAL ALUMINUM SCALE RESTING ON STEP IS FOUR FEET LONG. THE BOTTOM OF THE HOLD IS MADE OF POURED CONCRETE AND HAS A CENTER DRAIN TO COLLECT WATER FROM MELTING ICE AND OTHER FLUIDS. THE DRAIN LED TO A SUMP CLEARED BY A BILGE PUMP WHICH PUMPED OVERBOARD. THE RECTANGULAR OPENING IN THE BULKHEAD WAS CUT TO ENABLE EASIER REMOVAL OF THE ENGINE AFTER THE EVELINA M. GOULART WAS ABANDONED. - Auxiliary Fishing Schooner "Evelina M. Goulart", Essex Shipbuilding Museum, 66 Main Street, Essex, Essex County, MA

  1. General view looking aft along the port side of the ...

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

    General view looking aft along the port side of the Orbiter Discovery into its payload bay. Note the Remote Manipulator System, Canadarm, in the foreground mounted on the port side longeron. The Remote Sensor Arm is mounted on the opposite, starboard, longeron. Also note the airlock and the protective covering over the docking mechanism. This image was taken in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  2. Detail view looking aft along the starboard side of the ...

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

    Detail view looking aft along the starboard side of the Orbiter Discovery where the forward section meets the mid-fuselage. Note the head of the jack stand and its mechanism to connect to the one of the forward hoist attach points of the orbiter. Also note the support structure of the service platforms. This view was taken from the service platform in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  3. Detail view in engine bay three in the the aft ...

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

    Detail view in engine bay three in the the aft fuselage of the Orbiter Discovery. This view shows the engine interface fittings and the hydraulic-actuator support structure. The propellant feed lines are the large plugged and capped orifices. Note the handwritten references on the thrust plate in proximity to the actuators that read E3 Pitch and E3 Yaw. This view was taken from a service platform in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  4. Effects of Bifurcations on Aft-Fan Engine Nacelle Noise

    NASA Technical Reports Server (NTRS)

    Nark, Douglas M.; Farassat, Fereidoun; Pope, D. Stuart; Vatsa, Veer N.

    2004-01-01

    Aft-fan engine nacelle noise is a significant factor in the increasingly important issue of aircraft community noise. The ability to predict such noise within complex duct geometries is a valuable tool in studying possible noise attenuation methods. A recent example of code development for such predictions is the ducted fan noise propagation and radiation code CDUCT-LaRC. This work focuses on predicting the effects of geometry changes (i.e. bifurcations, pylons) on aft fan noise propagation. Beginning with simplified geometries, calculations show that bifurcations lead to scattering of acoustic energy into higher order modes. In addition, when circumferential mode number and the number of bifurcations are properly commensurate, bifurcations increase the relative importance of the plane wave mode near the exhaust plane of the bypass duct. This is particularly evident when the bypass duct surfaces include acoustic treatment. Calculations involving more complex geometries further illustrate that bifurcations and pylons clearly affect modal content, in both propagation and radiation calculations. Additionally, results show that consideration of acoustic radiation results may provide further insight into acoustic treatment effectiveness for situations in which modal decomposition may not be straightforward. The ability of CDUCT-LaRC to handle complex (non-axisymmetric) multi-block geometries, as well as axially and circumferentially segmented liners, allows investigation into the effects of geometric elements (bifurcations, pylons).

  5. Convergent Regulation of Candida albicans Aft2 and Czf1 in Invasive and Opaque Filamentation.

    PubMed

    Xu, Ning; Dong, Yi-Jie; Yu, Qi-Lin; Zhang, Bing; Zhang, Meng; Jia, Chang; Chen, Yu-Lu; Zhang, Biao; Xing, Lai-Jun; Li, Ming-Chun

    2015-09-01

    Candida albicans is the most common fungal pathogen of mucosal infections and invasive diseases in immuno-compromised humans. The abilities of yeast-hyphal growth and white-opaque switching affect C. albicans physiology and virulence. Here, we showed that C. albicans Aft2 regulator was required for embedded filamentous growth and opaque cell-type formation. Under low-temperature matrix embedded conditions, Aft2 functioned downstream of Czf1-mediated pathway and was required for invasive filamentation. Moreover, deletion of AFT2 significantly reduced opaque cell-type formation under N-acetylglucosamine (GlcNAc) inducing conditions. Ectopic expression of CZF1 slightly increased the white-opaque switching frequency in the aft2Δ/Δ mutant, but did not completely restore to wild-type levels, suggesting that Czf1 at least partially bypassed the essential requirement for Aft2 in response to opaque-inducing cues. In addition, multiple environmental cues altered AFT2 mRNA and protein levels, such as low temperature, physical environment and GlcNAc. Although the absence of Czf1 or Efg1 also increased the expression level of AFT2 gene, deletion of CZF1 remarkably reduced the stability of Aft2 protein. Furthermore, C. albicans Aft2 physically interacted with Czf1 under all tested conditions, whereas the interaction between Aft2 and Efg1 was barely detectable under embedded conditions, supporting the hypothesis that Aft2, together with Czf1, contributed to activate filamentous growth by antagonizing Efg1-mediated repression under matrix-embedded conditions.

  6. Berkeley Lighting Cone

    SciTech Connect

    Lask, Kathleen; Gadgil, Ashok

    2016-10-24

    A lighting cone is a simple metal cone placed on the fuel bed of a stove during ignition to act as a chimney, increasing the draft through the fuel bed. Many stoves tend to be difficult to light due to poor draft through the fuel bed, so lighting cones are used in various parts of the world as an inexpensive accessory to help with ignition.

  7. Flight control augmentation for AFT CG launch vehicles

    NASA Technical Reports Server (NTRS)

    Barret, Chris

    1996-01-01

    The Space Shuttle was only the first step in achieving routine access to space. Recently, the NASA Marshall Space Flight Center (MSFC) has been studying a whole spectrum of new launch vehicles (L/V's) for space transportation. Some of these could transport components of the Space Station to orbit, and some could take us to Mars and beyond to boldly expand our frontiers of knowledge. In all our future launch vehicle (L/V) designs, decreasing the structural weight will always be of great concern. This is tantamount to increased payload capability, which in turn means reduced cost-per-pound to orbit. One very significant increase in payload capability has been defined. In a L/V recently studied at MSFC it has been shown that a sizable weight savings can be realized by a rearrangement of the internal propellant tanks. Studies have been conducted both at MSFC and at Martin Marietta Corporation, maker of the Space Shuttle External Tank (ET) which show that a very substantial weight can be saved by inverting the relative positions of the liquid hydrogen (LH2) and the liquid oxygen (LOX) propellant tanks in a particular L/V studied. As the vehicle sits on the launch pad, in the conventional configuration the heavier LOX tank is located on top of the lighter LH2. This requires a heavy structural member between the two tanks to prevent the lighter LH2 tank from being crushed. This configuration also requires large, long, and even drag producing LOX feed lines running the length of the vehicle on the exterior fuselage. If the relative position of the propellant tanks is inverted, both the heavy structural separation member and the long LOX feed lines could be deleted. While the structures community at MSFC was elated with this finding, the LOX tank aft configuration gave the vehicle an aft center-of-gravity (cg) location which surfaced controllability concerns. In the conventional configuration the L/V is controlled in the ascent trajectory by the gimballing of its rocket

  8. View forward to aft of compartment A126, port side fore ...

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

    View forward to aft of compartment A-126, port side fore to aft showing scuttlebutt (drinking water fountain) in background, deck fittings, coal bunker manhole cover at lower left. (043) - USS Olympia, Penn's Landing, 211 South Columbus Boulevard, Philadelphia, Philadelphia County, PA

  9. 77 FR 37768 - Airworthiness Directives; Aeronautical Accessories, Inc., High Landing Gear Aft Crosstube Assembly

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-25

    ... recurring visual, dimensional, and fluorescent penetrant inspections of each aft crosstube, and replacing... recurring visual, dimensional, and fluorescent penetrant inspections of each aft crosstube. If there is a... for a visual inspection; \\1/2\\ hour to do the repetitive visual inspections, assuming 14...

  10. STS-38 Mission Specialist (MS) Springer uses camera on OV-104 aft flight deck

    NASA Technical Reports Server (NTRS)

    1990-01-01

    STS-38 Mission Specialist (MS) Robert C. Springer, holding HASSELBLAD camera, positions himself under aft flight deck overhead window W7 before recording the Earth's surface below. Behind Springer are Atlantis', Orbiter Vehicle (OV) 104's, onorbit station and aft flight deck viewing windows.

  11. On the Space Shuttle Endeavour's aft flight deck, astronaut Daniel W. Bursch, mission specialist, is

    NASA Technical Reports Server (NTRS)

    1996-01-01

    STS-77 esc view --- On the Space Shuttle Endeavour's aft flight deck, astronaut Daniel W. Bursch, mission specialist, is photographed prior to recording still pictures of an Earth observation target of opportunity. A camera lens is temporarily stowed nearby on the aft wall. A crew mate exposed the image with an Electronic Still Camera (ESC).

  12. 4. AERIAL VIEW EXUSS HORNET CVS12 LOOKING AFT TO FORWARD ...

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

    4. AERIAL VIEW EX-USS HORNET CVS-12 LOOKING AFT TO FORWARD DOWN CENTERLINE WITH OTHER INACTIVE SHIPS MOORED ALONGSIDE AFT PORT QUARTER AND ACROSS PIER. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  13. The EXIT procedure: principles, pitfalls, and progress.

    PubMed

    Marwan, Ahmad; Crombleholme, Timothy M

    2006-05-01

    Although performing procedures on a fetus before severing the umbilical cord has previously been reported, the principles of the ex utero intrapartum treatment (EXIT) procedure were first fully developed for reversing tracheal occlusion in fetuses with severe congenital diaphragmatic hernia. The EXIT procedure offers the advantage of insuring uteroplacental gas exchange while on placental support. The lessons learned in the development of the principles that underlie the EXIT procedure have improved outcomes when applied in other conditions, most notably in cases of airway obstruction. The range of indications for the EXIT procedure has expanded and currently includes giant fetal neck masses, lung or mediastinal tumors, congenital high airway obstruction syndrome, and EXIT to ECMO (extracorporeal membrane oxygenation), among others. This review summarizes the underlying principles of the EXIT procedure, the expanding indications for its use, the pitfalls of management, and the progress that has been made in its successful application.

  14. Exit-site care in peritoneal dialysis.

    PubMed

    Wadhwa, Nand K; Reddy, Gampala H

    2007-01-01

    Exit-site infection (ESI), tunnel infection and associated peritonitis are major causes of morbidity and catheter loss in chronic peritoneal dialysis patients. Meticulous exit-site care is vital in preventing ESI. Avoiding trauma to the exit-site and daily cleaning of the exit-site with a dedicated antimicrobial soap is essential for the longevity of the peritoneal dialysis catheter. Antibiotics cream and disinfectant agents including povidone-iodine, chlorhexidine, electrolytic chloroxidizing solutions (Amuchina 10% - ExSept Plus, Amuchina 5% - ExSept) are useful to keep the resident micro-organisms inhibited. ESI rates in peritoneal dialysis patients treated with Amuchina 10% (ExSept Plus) and Amuchina 5% (ExSept) for the exit-site care are similar or lower compared to povidone-iodine or chlorhexidine. Electrolytic chloroxidizing (Amuchina 10% - ExSept Plus and Amuchina 5% - ExSept) solutions for exit-site care are effective for prevention and treatment of ESI.

  15. Effect of AFT Rotor on the Inter-Rotor Flow of an Open Rotor Propulsion System

    NASA Technical Reports Server (NTRS)

    Slaboch, Paul E.; Stephens, David B.; Van Zante, Dale E.

    2016-01-01

    The effects of the aft rotor on the inter-rotor flow field of an open rotor propulsion rig were examined. A Particle Image Velocimetry (PIV) dataset that was acquired phase locked to the front rotor position has been phase averaged based on the relative phase angle between the forward and aft rotors. The aft rotor phase was determined by feature tracking in raw PIV images through an image processing algorithm. The effect of the aft rotor potential field on the inter-rotor flow were analyzed and shown to be in good agreement with Computational Fluid Dynamics (CFD) simulations. It was shown that the aft rotor had no substantial effect on the position of the forward rotor tip vortex but did have a small effect on the circulation strength of the vortex when the rotors were highly loaded.

  16. Closeup oblique view of the aft fuselage of the Orbiter ...

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

    Close-up oblique view of the aft fuselage of the Orbiter Discovery looking forward and starboard as the last Space Shuttle Main Engine is being removed, it can be seen on the right side of the image frame. Note that one of the Orbiter Maneuvering System/ Reaction Control System has been removed while one of them remains. Also note that the body flap, below the engine positions has a protective covering to prevent damage to the High-temperature Reusable Surface Insulation tiles. This image was taken inside the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  17. Closeup oblique view of the aft fuselage of the Orbiter ...

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

    Close-up oblique view of the aft fuselage of the Orbiter Discovery looking forward and port as the last Space Shuttle Main Engine is being removed, it can be seen on the left side of the image frame. Note that one of the Orbiter Maneuvering System/ Reaction Control System has been removed while one of them remains. Also note that the body flap, below the engine positions has a protective covering to prevent damage to the High-temperature Reusable Surface Insulation tiles. This image was taken inside the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  18. General view of the middeck looking aft and port. In ...

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

    General view of the mid-deck looking aft and port. In this view you can clearly see the crew access hatch and the airlock hatch. The hose and ladder in the image are pieces of ground support equipment. The hose is part of the climate control apparatus used while orbiters are being processed. The ladder is used to access the inter-deck passage, leading to the flight deck, while the orbiter is in 1g (earth's gravity). A careful observer will notice a void in the wall near the base of the access ladder, this is the Waste Management Compartment with the Waste Management System, i.e. Space Potty, removed. This view was taken in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  19. 30. Engine controls and valve gear, looking aft on main ...

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

    30. Engine controls and valve gear, looking aft on main (promenade) deck level. Threaded admission valve lift rods (two at immediate left of chronometer) permit adjustment of valve timing in lower and upper admission valves of cylinder (left rod controls lower valve, right rod upper valve). Valve rods are lifted by jaw-like "wipers" during operation. Exhaust valve lift rods and wipers are located to right of chronometer. Crank at extreme right drives valve wiper shaft when engaged to end of eccentric rod, shown under "Crank Indicator" dial. Pair of handles to immediate left of admission valve rods control condenser water valves; handles to right of exhaust valve rods control feedwater flow to boilers from pumps. Gauges indicate boiler pressure (left) and condenser vacuum (right); "Crank Indicator" on wall aids engineer in keeping engine crank off "dead-center" at stop so that engine may be easily restarted. - Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

  20. A method for calculating strut and splitter plate noise in exit ducts: Theory and verification

    NASA Technical Reports Server (NTRS)

    Fink, M. R.

    1978-01-01

    Portions of a four-year analytical and experimental investigation relative to noise radiation from engine internal components in turbulent flow are summarized. Spectra measured for such airfoils over a range of chord, thickness ratio, flow velocity, and turbulence level were compared with predictions made by an available rigorous thin-airfoil analytical method. This analysis included the effects of flow compressibility and source noncompactness. Generally good agreement was obtained. This noise calculation method for isolated airfoils in turbulent flow was combined with a method for calculating transmission of sound through a subsonic exit duct and with an empirical far-field directivity shape. These three elements were checked separately and were individually shown to give close agreement with data. This combination provides a method for predicting engine internally generated aft-radiated noise from radial struts and stators, and annular splitter rings. Calculated sound power spectra, directivity, and acoustic pressure spectra were compared with the best available data. These data were for noise caused by a fan exit duct annular splitter ring, larger-chord stator blades, and turbine exit struts.

  1. 14 CFR 121.585 - Exit seating.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 14 Aeronautics and Space 3 2014-01-01 2014-01-01 false Exit seating. 121.585 Section 121.585 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) AIR CARRIERS..., or otherwise open emergency exits; (iv) To lift out, hold, deposit on nearby seats, or maneuver...

  2. 24 CFR 257.118 - Exit fee.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... PROGRAM Eligibility Requirements and Underwriting Procedures § 257.118 Exit fee. (a) Initial Equity. For... 24 Housing and Urban Development 2 2011-04-01 2011-04-01 false Exit fee. 257.118 Section 257.118 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued) OFFICE...

  3. 24 CFR 257.118 - Exit fee.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... PROGRAM Eligibility Requirements and Underwriting Procedures § 257.118 Exit fee. (a) Initial Equity. For... 24 Housing and Urban Development 2 2014-04-01 2014-04-01 false Exit fee. 257.118 Section 257.118 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued) OFFICE...

  4. 24 CFR 257.118 - Exit fee.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... PROGRAM Eligibility Requirements and Underwriting Procedures § 257.118 Exit fee. (a) Initial Equity. For... 24 Housing and Urban Development 2 2012-04-01 2012-04-01 false Exit fee. 257.118 Section 257.118 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued) OFFICE...

  5. 24 CFR 257.118 - Exit fee.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... PROGRAM Eligibility Requirements and Underwriting Procedures § 257.118 Exit fee. (a) Initial Equity. For... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Exit fee. 257.118 Section 257.118 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued) OFFICE...

  6. Regulation of Mitotic Exit in Saccharomyces cerevisiae.

    PubMed

    Baro, Bàrbara; Queralt, Ethel; Monje-Casas, Fernando

    2017-01-01

    The Mitotic Exit Network (MEN) is an essential signaling pathway, closely related to the Hippo pathway in mammals, which promotes mitotic exit and initiates cytokinesis in the budding yeast Saccharomyces cerevisiae. Here, we summarize the current knowledge about the MEN components and their regulation.

  7. 29 CFR 1917.122 - Employee exits.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 29 Labor 7 2013-07-01 2013-07-01 false Employee exits. 1917.122 Section 1917.122 Labor Regulations Relating to Labor (Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED... marked. (b) If an employee exit is not visible from employees' work stations, directional...

  8. 29 CFR 1917.122 - Employee exits.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 29 Labor 7 2011-07-01 2011-07-01 false Employee exits. 1917.122 Section 1917.122 Labor Regulations Relating to Labor (Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED... marked. (b) If an employee exit is not visible from employees' work stations, directional...

  9. Real-Time Measurements of Aft Dome Insulation Erosion on Space Shuttle Reusable Solid Rocket Motor

    NASA Technical Reports Server (NTRS)

    McWhorter, Bruce; Ewing, Mark; Albrechtsen, Kevin; Noble, Todd; Longaker, Matt

    2004-01-01

    Real-time erosion of aft dome internal insulation was measured with internal instrumentation on a static test of a lengthened version of the Space Shuffle Reusable Solid Rocket Motor (RSRM). This effort marks the first time that real-time aft dome insulation erosion (Le., erosion due to the combined effects of thermochemical ablation and mechanical abrasion) was measured in this kind of large motor static test [designated as Engineering Test Motor number 3 (ETM3)I. This paper presents data plots of the erosion depth versus time. The data indicates general erosion versus time behavior that is in contrast to what would be expected from earlier analyses. Engineers have long known that the thermal environment in the aft dome is severe and that the resulting aft dome insulation erosion is significant. Models of aft dome erosion involve a two-step process of computational fluid dynamics (CFD) modeling and material ablation modeling. This modeling effort is complex. The time- dependent effects are difficult to verify with only prefire and postfire insulation measurements. Nozzle vectoring, slag accumulation, and changing boundary conditions will affect the time dependence of aft dome erosion. Further study of this data and continued measurements on future motors will increase our understanding of the aft dome flow and erosion environment.

  10. Rotor with Flattened Exit Pressure Profile

    NASA Technical Reports Server (NTRS)

    Baltas, Constantine (Inventor); Prasad, Dilip (Inventor); Gallagher, Edward J. (Inventor)

    2015-01-01

    A rotor blade comprises an airfoil extending radially from a root section to a tip section and axially from a leading edge to a trailing edge, the leading and trailing edges defining a curvature therebetween. The curvature determines a relative exit angle at a relative span height between the root section and the tip section, based on an incident flow velocity at the leading edge of the airfoil and a rotational velocity at the relative span height. In operation of the rotor blade, the relative exit angle determines a substantially flat exit pressure ratio profile for relative span heights from 75% to 95%, wherein the exit pressure ratio profile is constant within a tolerance of 10% of a maximum value of the exit pressure ratio profile.

  11. Growth cone collapse assay.

    PubMed

    Cook, Geoffrey M W; Jareonsettasin, Prem; Keynes, Roger J

    2014-01-01

    The growth cone collapse assay has proved invaluable in detecting and purifying axonal repellents. Glycoproteins/proteins present in detergent extracts of biological tissues are incorporated into liposomes, added to growth cones in culture and changes in morphology are then assessed. Alternatively purified or recombinant molecules in aqueous solution may be added directly to the cultures. In both cases after a defined period of time (up to 1 h), the cultures are fixed and then assessed by inverted phase contrast microscopy for the percentage of growth cones showing a collapsed profile with loss of flattened morphology, filopodia, and lamellipodia.

  12. Topological inflation with graceful exit

    NASA Astrophysics Data System (ADS)

    Marunović, Anja; Prokopec, Tomislav

    2016-04-01

    We investigate a class of models of topological inflation in which a super-Hubble-sized global monopole seeds inflation. These models are attractive since inflation starts from rather generic initial conditions, but their not so attractive feature is that, unless symmetry is again restored, inflation never ends. In this work we show that, in presence of another nonminimally coupled scalar field, that is both quadratically and quartically coupled to the Ricci scalar, inflation naturally ends, representing an elegant solution to the graceful exit problem of topological inflation. While the monopole core grows during inflation, the growth stops after inflation, such that the monopole eventually enters the Hubble radius, and shrinks to its Minkowski space size, rendering it immaterial for the subsequent Universe's dynamics. Furthermore, we find that our model can produce cosmological perturbations that source CMB temperature fluctuations and seed large scale structure statistically consistent (within one standard deviation) with all available data. In particular, for small and (in our convention) negative nonminimal couplings, the scalar spectral index can be as large as ns simeq 0.955, which is about one standard deviation lower than the central value quoted by the most recent Planck Collaboration.

  13. Space Shuttle with rail system and aft thrust structure securing solid rocket boosters to external tank

    NASA Technical Reports Server (NTRS)

    Vonpragenau, G. L. (Inventor)

    1984-01-01

    The configuration and relationship of the external propellant tank and solid rocket boosters of space transportation systems such as the space shuttle are described. The space shuttle system with the improved propellant tank is shown. The external tank has a forward pressure vessel for liquid hydrogen and an aft pressure vessel for liquid oxygen. The solid rocket boosters are joined together by a thrust frame which extends across and behind the external tank. The thrust of the orbiter's main rocket engines are transmitted to the aft portion of the external tank and the thrust of the solid rocket boosters are transmitted to the aft end of the external tank.

  14. Thermal Analysis of the X-38 Aft Fin During Re-Entry

    NASA Technical Reports Server (NTRS)

    Hong, Andrew E.

    1999-01-01

    This document contains the details of the thermal analysis of the X-38 aft fin during re-entry. This analysis was performed in order to calculate temperature response of the aft fin components. This would be provided as input to a structural analysis and would also define the operating environment for the electromechanical actuator (EMA). The calculated structural temperature response would verify the performance of the thermal protection system (TPS). The geometric representation of the aft fin was derived from an I-DEAS finite element model that was used for structural analysis. The thermal mass network model was derived from the geometric representation.

  15. Effects of an aft facing step on the surface of a laminar flow glider wing

    NASA Technical Reports Server (NTRS)

    Sandlin, Doral R.; Saiki, Neal

    1993-01-01

    A motor glider was used to perform a flight test study on the effects of aft facing steps in a laminar boundary layer. This study focuses on two dimensional aft facing steps oriented spanwise to the flow. The size and location of the aft facing steps were varied in order to determine the critical size that will force premature transition. Transition over a step was found to be primarily a function of Reynolds number based on step height. Both of the step height Reynolds numbers for premature and full transition were determined. A hot film anemometry system was used to detect transition.

  16. 2017 Eclipse Shadow Cones

    NASA Video Gallery

    A solar eclipse occurs when the Moon's shadow falls on the Earth. The shadow comprises two concentric cones called the umbra and the penumbra. Within the smaller, central umbra, the Sun is complete...

  17. 14 CFR 25.809 - Emergency exit arrangement.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 14 Aeronautics and Space 1 2012-01-01 2012-01-01 false Emergency exit arrangement. 25.809 Section... Emergency exit arrangement. (a) Each emergency exit, including each flightcrew emergency exit, must be a... outside. In addition, each emergency exit must have means to permit viewing of the conditions outside...

  18. 14 CFR 25.809 - Emergency exit arrangement.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 14 Aeronautics and Space 1 2013-01-01 2013-01-01 false Emergency exit arrangement. 25.809 Section... Emergency exit arrangement. (a) Each emergency exit, including each flightcrew emergency exit, must be a... outside. In addition, each emergency exit must have means to permit viewing of the conditions outside...

  19. 14 CFR 25.809 - Emergency exit arrangement.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 14 Aeronautics and Space 1 2014-01-01 2014-01-01 false Emergency exit arrangement. 25.809 Section... Emergency exit arrangement. (a) Each emergency exit, including each flightcrew emergency exit, must be a... outside. In addition, each emergency exit must have means to permit viewing of the conditions outside...

  20. 49 CFR 393.62 - Emergency exits for buses.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... straight (parallel to the undisturbed exit surface) motions to operate the exit, no more than 89 Newtons (20 pounds) of force shall be required to release the exit. For exits which require a straight motion... operating instructions describing each motion necessary to unlatch or open the exit located within 152 mm...

  1. 49 CFR 393.62 - Emergency exits for buses.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... straight (parallel to the undisturbed exit surface) motions to operate the exit, no more than 89 Newtons (20 pounds) of force shall be required to release the exit. For exits which require a straight motion... operating instructions describing each motion necessary to unlatch or open the exit located within 152 mm...

  2. 49 CFR 393.62 - Emergency exits for buses.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... straight (parallel to the undisturbed exit surface) motions to operate the exit, no more than 89 Newtons (20 pounds) of force shall be required to release the exit. For exits which require a straight motion... operating instructions describing each motion necessary to unlatch or open the exit located within 152 mm...

  3. HSURIA Cone Centration.

    DTIC Science & Technology

    1981-09-01

    laser. b. Interferometer configuration. This configuration (Fig. 4) uses a Twyman -Green interferometer to measure the cone centration for comparison...autocollimator. The interferometer mode, as was explained in Section Ill-l, gave very little information about the alignment of the cone. c. Physical...the camera turning flat (5) must be removed and the centration sensor laser is used. The interferometer laser is turned off. For the interferometer

  4. Solid rocket motor aft field joint flow field analysis

    NASA Technical Reports Server (NTRS)

    Sabnis, Jayant S.; Gibeling, Edward J.; Mcdonald, Henry

    1987-01-01

    An efficient Navier-Stokes analysis was successfully applied to simulate the complex flow field in the vicinity of a slot in a solid rocket motor with segment joints. The capability of the computer code to resolve the flow near solid surfaces without using a wall function assumption was demonstrated. In view of the complex nature of the flow field in the vicinity of the slot, this approach is considered essential. The results obtained from these calculations provide valuable design information, which would otherwise be extremely difficult to obtain. The results of the axisymmetric calculations indicate the presence of a region of reversed axial flow at the aft-edge of the slot and show the over-pressure in the slot to be only about 10 psi. The results of the asymmetric calculations indicate that a pressure asymmetry more than two diameters downstream of the slot has no noticeable effect on the flow field in the slot. They also indicate that the circumferential pressure differential caused in the slot due to failure of a 15 deg section of the castable inhibitor will be approximately 1 psi.

  5. Closeup view of the aft fuselage of the Orbiter Discovery ...

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

    Close-up view of the aft fuselage of the Orbiter Discovery looking at the thrust structure that supports the Space Shuttle Main Engines (SSMEs). In this view, SSME number two position is on the left and SSME number three position is on the right. The thrust structure transfers the forces produce by the engines into and through the airframe of the orbiter. The thrust structure includes the SSMEs load reaction truss structure, engine interface fittings and the hydraulic-actuator support structure. The propellant feed lines are the plugged and capped orifices within the engine bays. Note that SSME position two is rotated ninety degrees from position three and one. This was needed to enable enough clearance for the engines to fit and gimbal. Note in engine bay three is a clear view of the actuators that control the gambling of that engine. This view was taken from a service platform in the Orbiter Processing Facility at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  6. Space Shuttle Main Engine structural analysis and data reduction/evaluation. Volume 1: Aft Skirt analysis

    NASA Technical Reports Server (NTRS)

    Berry, David M.; Stansberry, Mark

    1989-01-01

    Using the ANSYS finite element program, a global model of the aft skirt and a detailed nonlinear model of the failure region was made. The analysis confirmed the area of failure in both STA-2B and STA-3 tests as the forging heat affected zone (HAZ) at the aft ring centerline. The highest hoop strain in the HAZ occurs in this area. However, the analysis does not predict failure as defined by ultimate elongation of the material equal to 3.5 percent total strain. The analysis correlates well with the strain gage data from both the Wyle influence test of the original design aft sjirt and the STA-3 test of the redesigned aft skirt. it is suggested that the sensitivity of the failure area material strength and stress/strain state to material properties and therefore to small manufacturing or processing variables is the most likely cause of failure below the expected material ultimate properties.

  7. STS-33 MS Carter operates translation hand control (THC) on aft flight deck

    NASA Technical Reports Server (NTRS)

    1989-01-01

    STS-33 Mission Specialist (MS) Manley L. Carter, Jr operates translation hand control (THC) at the aft flight deck onorbit station while peering out overhead window W7. Carter's communications kit assembly headset microphone extends across his face.

  8. Astronaut Daniel W. Bursch, mission specialist, pauses during a photography session on the aft

    NASA Technical Reports Server (NTRS)

    1996-01-01

    STS-77 ESC VIEW --- Astronaut Daniel W. Bursch, mission specialist, pauses during a photography session on the aft flight deck of the Space Shuttle Endeavour. The scene was recorded with an Electronic Still Camera (ESC).

  9. 5. AERIAL VIEW EXUSS HORNET CVS12 FROM AFT PORT QUARTER. ...

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

    5. AERIAL VIEW EX-USS HORNET CVS-12 FROM AFT PORT QUARTER. OTHER INACTIVE SHIPS MOORED ALONGSIDE AND IN BACKGROUND. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  10. STS-47 Mission Specialist (MS) Jemison conducts AFTE in SLJ module on OV-105

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-47 Mission Specialist (MS) Mae C. Jemison, wearing autogenic feedback training system 2 suit, conducts the Autogenic Feedback Training Experiment (AFTE) in Spacelab Japan (SLJ) science module aboard Endeavour, Orbiter Vehicle (OV) 105. AFTE's objective is to teach astronauts to use biofeedback rather than drugs to combat nausea and other effects of space motion sickness. Jemison's physical responses are monitored by sensors attached to the suit.

  11. STS-46 MS-PLC Hoffman monitors EURECA deploy from OV-104's aft flight deck

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-46 Mission Specialist (MS) and Payload Commander (PLC) Jeffrey A. Hoffman, wearing polarized goggles (sunglasses), monitors the European Retrievable Carrier 1L (EURECA-1L) satellite deploy from the aft flight deck of Atlantis, Orbiter Vehicle (OV) 104. The remote manipulator system arm's 'Canada' insignia is visible in aft flight deck viewing window W10. Hoffman's left hand is positioned at overhead window W8.

  12. STS-35 MS Hoffman changes a roll of film on OV-102's aft flight deck

    NASA Technical Reports Server (NTRS)

    1990-01-01

    STS-35 Mission Specialist (MS) Jeffrey A. Hoffman changes a roll of film in a 70mm ROLLEIFLEX camera while on the aft flight deck of Columbia, Orbiter Vehicle (OV) 102. Though the mission was dedicated largely to the discipline of astrophysics, the blue and white Earth, partially seen here through OV-102's overhead window W7 and aft flight deck viewing window W9, was also observed and photographed by the crewmembers during the nine-day flight.

  13. STS-26 Commander Hauck looks out window W8 on shuttle mockup aft flight deck

    NASA Technical Reports Server (NTRS)

    1988-01-01

    STS-26 Discovery, Orbiter Vehicle (OV) 103, Commander Frederick H. Hauck looks up at overhead window W8 while on shuttle mockup aft flight deck in the Shuttle Mockup and Integration Laboratory Bldg 9A. Hauck rests his right arm between Onorbit Station control panel A7U and aft viewing window W10. Photograph was taken by Keith Meyers of the NEW YORK TIMES.

  14. 49 CFR 393.62 - Emergency exits for buses.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... straight (parallel to the undisturbed exit surface) motions to operate the exit, no more than 89 Newtons... perpendicular to the undisturbed exit surface, no more than 267 Newtons (60 pounds) shall be required to...

  15. 49 CFR 393.62 - Emergency exits for buses.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... straight (parallel to the undisturbed exit surface) motions to operate the exit, no more than 89 Newtons... perpendicular to the undisturbed exit surface, no more than 267 Newtons (60 pounds) shall be required to...

  16. The Exit Interview--A Lasting Impression.

    ERIC Educational Resources Information Center

    Dworak, Linda L.

    1983-01-01

    Personnel administrators should insist on a well-managed exit interview process to monitor departmental turnover and to acquire feedback about the working environment. Some procedures to develop an effective process are discussed. (MLW)

  17. Tug of war at the exit door

    PubMed Central

    Dustin, Michael L.; Chakraborty, Arup K.

    2009-01-01

    The lipid sphingosine-1-phosphate has been identified as a key exit signal for lymph nodes. Pham et al show that its action can only be understood in the context of retention signals transduced by CCR7. PMID:18199414

  18. 14 CFR 23.807 - Emergency exits.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... airplanes with a seating capacity of two or more, excluding airplanes with canopies, at least one emergency... and operation. Emergency exits must be movable windows, panels, canopies, or external doors,...

  19. Entry/Exit Port testing, test report

    SciTech Connect

    Winkelman, R.H.

    1993-05-01

    The Waste Receiving and Processing Module I (WRAP-1) facility must have the ability to allow 55-gallon drums to enter and exit glovebox enclosures. An Entry/Exit Port (Appendix 1, Figure 1), designed by United Engineers and Constructors (UE&C), is one method chosen for drum transfer. The Entry/Exit Port is to be used for entry of 55-gallon drums into both process entry gloveboxes, exit of 55-gallon drum waste pucks from the low-level waste (LLW) glovebox, and loadout of waste from the restricted waste management glovebox. The Entry/Exit Port relies on capture velocity air flow and a neoprene seal to provide alpha confinement when the Port is in the open and closed positions, respectively. Since the glovebox is in a slight vacuum, air flow is directed into the glovebox through the space between the overpack drum and glovebox floor. The air flow is to direct any airborne contamination into the glovebox. A neoprene seal is used to seal the Port door to the glovebox floor, thus maintaining confinement in the closed position. Entry/Exit Port testing took place February 17, 1993, through April 14, 1993, in the 305 building of Westinghouse Hanford Company. Testing was performed in accordance with the Entry/Exit Port Testing Test Plan, document number WHC-SD-WO26-TP-005. A prototype Entry/Exit Port built at the Hanford Site was tested using fluorescent paint pigment and smoke candles as simulant contaminants. This test report is an interim test report. Further developmental testing is required to test modifications made to the Port as the original design of the Port did not provide complete confinement during all stages of operation.

  20. The cone dysfunction syndromes

    PubMed Central

    Aboshiha, Jonathan; Dubis, Adam M; Hardcastle, Alison J; Michaelides, Michel

    2016-01-01

    The cone dysfunction syndromes are a heterogeneous group of inherited, predominantly stationary retinal disorders characterised by reduced central vision and varying degrees of colour vision abnormalities, nystagmus and photophobia. This review details the following conditions: complete and incomplete achromatopsia, blue-cone monochromatism, oligocone trichromacy, bradyopsia and Bornholm eye disease. We describe the clinical, psychophysical, electrophysiological and imaging findings that are characteristic to each condition in order to aid their accurate diagnosis, as well as highlight some classically held notions about these diseases that have come to be challenged over the recent years. The latest data regarding the genetic aetiology and pathological changes observed in the cone dysfunction syndromes are discussed, and, where relevant, translational avenues of research, including completed and anticipated interventional clinical trials, for some of the diseases described herein will be presented. Finally, we briefly review the current management of these disorders. PMID:25770143

  1. Exit from Synchrony in Joint Improvised Motion

    PubMed Central

    Dahan, Assi; Noy, Lior; Hart, Yuval; Mayo, Avi; Alon, Uri

    2016-01-01

    Motion synchrony correlates with effective and well-rated human interaction. However, people do not remain locked in synchrony; Instead, they repeatedly enter and exit synchrony. In many important interactions, such as therapy, marriage and parent-infant communication, it is the ability to exit and then re-enter synchrony that is thought to build strong relationship. The phenomenon of entry into zero-phase synchrony is well-studied experimentally and in terms of mathematical modeling. In contrast, exit-from-synchrony is under-studied. Here, we focus on human motion coordination, and examine the exit-from-synchrony phenomenon using experimental data from the mirror game paradigm, in which people perform joint improvised motion, and from human tracking of computer-generated stimuli. We present a mathematical mechanism that captures aspects of exit-from-synchrony in human motion. The mechanism adds a random motion component when the accumulated velocity error between the players is small. We introduce this mechanism to several models for human coordinated motion, including the widely studied HKB model, and the predictor-corrector model of Noy, Dekel and Alon. In all models, the new mechanism produces realistic simulated behavior when compared to experimental data from the mirror game and from tracking of computer generated stimuli, including repeated entry and exit from zero-phase synchrony that generates a complexity of motion similar to that of human players. We hope that these results can inform future research on exit-from-synchrony, to better understand the dynamics of coordinated action of people and to enhance human-computer and human-robot interaction. PMID:27711185

  2. Exit Strategies: How Low-Performing High Schools Respond to High School Exit Examination Requirements

    ERIC Educational Resources Information Center

    Holme, Jennifer Jellison

    2013-01-01

    Background: Over the past several decades, a significant number of states have either adopted or increased high school exit examination requirements. Although these policies are intended to generate improvement in schools, little is known about how high schools are responding to exit testing pressures. Purpose: This study examined how five…

  3. An Entrance to Exit Polling: Strategies for Using Exit Polls as Experiential Learning Projects

    ERIC Educational Resources Information Center

    Berry, Michael J.; Robinson, Tony

    2012-01-01

    Engaging students in the design, administration, and postelection analysis of an exit poll can be an excellent experiential learning activity. Lelieveldt and Rossen (2009) argue that exit polls are a "perfect teaching tool" because they provide students with a cooperative (rather than competitive) learning experience; help students…

  4. 10 CFR 431.202 - Definitions concerning illuminated exit signs.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 10 Energy 3 2010-01-01 2010-01-01 false Definitions concerning illuminated exit signs. 431.202... COMMERCIAL AND INDUSTRIAL EQUIPMENT Illuminated Exit Signs § 431.202 Definitions concerning illuminated exit signs. Basic model means, with respect to illuminated exit signs, all units of a given type...

  5. 10 CFR 431.202 - Definitions concerning illuminated exit signs.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 3 2011-01-01 2011-01-01 false Definitions concerning illuminated exit signs. 431.202... COMMERCIAL AND INDUSTRIAL EQUIPMENT Illuminated Exit Signs § 431.202 Definitions concerning illuminated exit signs. Basic model means, with respect to illuminated exit signs, all units of a given type...

  6. 49 CFR 238.113 - Emergency window exits.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 49 Transportation 4 2012-10-01 2012-10-01 false Emergency window exits. 238.113 Section 238.113... § 238.113 Emergency window exits. (a) Number and location. Except as provided in paragraph (a)(3) of... window exits. At least one emergency window exit shall be located in each side of each end (half) of...

  7. 49 CFR 238.113 - Emergency window exits.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 49 Transportation 4 2011-10-01 2011-10-01 false Emergency window exits. 238.113 Section 238.113... § 238.113 Emergency window exits. (a) Number and location. Except as provided in paragraph (a)(3) of... window exits. At least one emergency window exit shall be located in each side of each end (half) of...

  8. 14 CFR 27.805 - Flight crew emergency exits.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Flight crew emergency exits. 27.805 Section... § 27.805 Flight crew emergency exits. (a) For rotorcraft with passenger emergency exits that are not convenient to the flight crew, there must be flight crew emergency exits, on both sides of the rotorcraft...

  9. 14 CFR 29.805 - Flight crew emergency exits.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Flight crew emergency exits. 29.805 Section... Accommodations § 29.805 Flight crew emergency exits. (a) For rotorcraft with passenger emergency exits that are not convenient to the flight crew, there must be flight crew emergency exits, on both sides of...

  10. Low speed test of the aft inlet designed for a tandem fan V/STOL nacelle

    NASA Technical Reports Server (NTRS)

    Rhoades, W. W.; Ybarra, A. H.

    1980-01-01

    An approximately .25 scale model of a Tandem Fan nacelle designed for a Type A V/STOL aircraft configuration was tested in a 10-by-10 foot wind tunnel. A 12 inch, tip driven, turbofan simulator was used to provide the suction source for the aft fan inlet. The front fan inlet was faired over for this test entry. Model variables consisted of a long aft inlet cowl, a short aft inlet cowl, a shaft simulator, blow-in door passages and diffuser vortex generators. Inlet pressure recovery, distortion, inlet angle of attack separation limits were evaluated at tunnel velocities from 0 to 240 knots, angles of attack from -10 to 40 degrees and inlet flow rates representative of throat Mach numbers of 0.1 to 0.6. High inlet performance and stable operation was verified at all design forward speed and angle of attack conditions. The short aft inlet configuration provided exceptionally high pressure recovery except at the highest combination of angle of attack and forward speed. The flow quality at the fan face was somewhat degraded by the addition of blow-in door passages to the long aft inlet configuration due to the pressure disturbances generated by the flow entering the diffuser through the auxiliary air passages.

  11. Exit: a salvage procedure for intraoral teratoma.

    PubMed

    Masaany, B M; Ida Sadja'ah, S; Norleza, A N; Norzi, B G; Siti Sabzah, M H

    2012-10-01

    Teratomas arising from the palate or pharynx may cause immediate life-threatening airway obstruction to the newborn. Early diagnosis via antenatal ultrasound enables the treating team to perform an ex utero intrapartum treatment (EXIT) procedure to secure an airway and perform subsequent tumour resection. We present the first EXIT procedure done in Malaysia. A 34 year old , gravida 4, para 3, her unborn child diagnosed at 24 weeks of gestation to have a large oropharyngeal mass. Upper airway obstruction was anticipated. Orchestration of multiple specialities was executed to properly plan and perform the EXIT procedure. The fetus was delivered at 33 weeks of gestation and managed to be intubated. The extraoral portion of the multilobular mass originating from the palate was resected. Complete resection of the intraoral teratoma was successfully done at day 22 of life.

  12. Jet Exit Rig Six Component Force Balance

    NASA Technical Reports Server (NTRS)

    Castner, Raymond; Wolter, John; Woike, Mark; Booth, Dennis

    2012-01-01

    A new six axis air balance was delivered to the NASA Glenn Research Center. This air balance has an axial force capability of 800 pounds, primary airflow of 10 pounds per second, and a secondary airflow of 3 pounds per second. Its primary use was for the NASA Glenn Jet Exit Rig, a wind tunnel model used to test both low-speed, and high-speed nozzle concepts in a wind tunnel. This report outlines the installation of the balance in the Jet Exit Rig, and the results from an ASME calibration nozzle with an exit area of 8 square-inches. The results demonstrated the stability of the force balance for axial measurements and the repeatability of measurements better than 0.20 percent.

  13. Room evacuation through two contiguous exits

    NASA Astrophysics Data System (ADS)

    Sticco, I. M.; Frank, G. A.; Cerrotta, S.; Dorso, C. O.

    2017-05-01

    Current regulations demand that at least two exits should be available for a safe evacuation during a panic situation. The second exit is expected to reduce the overall clogging, and consequently, improve the evacuation time. However, rooms having contiguous doors not always reduce the leaving time as expected. We investigated the relation between the door's separation and the evacuation performance. We found that there exists a separation distance range that does not really improve the evacuation time, or it can even worsen the process performance. To our knowledge, no attention has been given to this issue in the literature. This work reports how the pedestrian's dynamics differ when the separation distance between two exit doors changes and how this affects the overall performance.

  14. Aft Body Closure: Predicted Strut Effects at M=2.4

    NASA Technical Reports Server (NTRS)

    Lamar, John E.; Garritz, Javier A.

    1999-01-01

    This paper reports the predicted M = 2.4 strut-interference effects on a closed aftbody with empennage for the TCA baseline model. The strut mounting technique was needed in order to assess the impact of aft-end shaping, i.e. open for a sting or closed to better represent a flight vehicle. However,this technique can potentially lead to unanticipated effects that are measured on the aft body. Therefore, a set of computations were performed in order to examine the closed aft body with and without strut present, at both zero and non-zero angles of sideslip (AOS). The work was divided into a computational task performed by Javier A. Garriz, using an inviscid (Euler) solver, and a monitoring/reporting task done by John E. Lamar. All this work was performed during FY98 at the NASA Langley Research Center.

  15. Ares I-X First Stage Internal Aft Skirt Re-Entry Heating Data and Modeling

    NASA Technical Reports Server (NTRS)

    Schmitz, Craig P.; Tashakkor, Scott B.

    2011-01-01

    The CLVSTATE engineering code is being used to predict Ares-I launch vehicle first stage reentry aerodynamic heating. An engineering analysis is developed which yields reasonable predictions for the timing of the first stage aft skirt thermal curtain failure and the resulting internal gas temperatures. The analysis is based on correlations of the Ares I-X internal aft skirt gas temperatures and has been implemented into CLVSTATE. Validation of the thermal curtain opening models has been accomplished using additional Ares I-X thermocouple, calorimeter and pressure flight data. In addition, a technique which accounts for radiation losses at high altitudes has been developed which improves the gas temperature measurements obtained by the gas temperature probes (GTP). Updates to the CLVSTATE models are shown to improve the accuracy of the internal aft skirt heating predictions which will result in increased confidence in future vehicle designs

  16. Space shuttle main engine high pressure fuel pump aft platform seal cavity flow analysis

    NASA Technical Reports Server (NTRS)

    Lowry, S. A.; Keeton, L. W.

    1987-01-01

    A general purpose, three-dimensional computational fluid dynamics code named PHOENICS, developed by CHAM Inc., is used to model the flow in the aft-platform seal cavity in the high pressure fuel pump of the space shuttle main engine. The model is used to predict the temperatures, velocities, and pressures in the cavity for six different sets of boundary conditions. The results are presented as input for further analysis of two known problems in the region, specifically: erratic pressures and temperatures in the adjacent coolant liner cavity and cracks in the blade shanks near the outer diameter of the aft-platform seal.

  17. STS-46 ESA MS Nicollier and PLC Hoffman pose on OV-104's aft flight deck

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-46 European Space Agency (ESA) Mission Specialist (MS) Claude Nicollier (left) and MS and Payload Commander (PLC) Jeffrey A. Hoffman pose in front of the onorbit station controls on the aft flight deck of Atlantis, Orbiter Vehicle (OV) 104. The overhead windows W7 and W8 appear above their heads and the aft flight deck viewing windows W9 and W10 behind them. Hoffman and Nicollier have been training together for a dozen years at JSC. Hoffman was an astronaut candidate in 1978 and Nicollier accompanied a group of trainees in 1980. Note the partially devoured chocolate Space Shuttle floating near the two.

  18. STS-30 crewmembers pose for onboard portrait on OV-104's aft flight deck

    NASA Technical Reports Server (NTRS)

    1989-01-01

    During STS-30 aboard Atlantis, Orbiter Vehicle (OV) 104, crewmembers pose for portrait. In front of aft flight deck onorbit station are (right to left) Mission Specialist (MS) Norman E. Thagard, Pilot Ronald J. Grabe, MS Mary L. Cleave, Commander David M. Walker, and MS Mark C. Lee. Crewmembers are wearing red, white, and blue mission polo shirts and light blue flight coveralls. Overhead windows W7 and W8 and aft flight deck viewing windows W9 and W10 are visible in view.

  19. Prediction of airplane aft-cabin noise using statistical energy analysis

    NASA Astrophysics Data System (ADS)

    Fung, Andrew K.; Davis, Evan B.

    2005-09-01

    Statistical energy analysis (SEA) predictions of turbulent boundary layer and engine exhaust noise in the aft cabin of an airplane have been made and compared to flight data. Measurements of engine shock-cell sound pressure levels, characterized by relatively long correlation lengths and circumferential and axial variation along the fuselage surface, were extrapolated and used as source inputs to an SEA model of a widebody airplane fuselage. Turbulent boundary layer pressure fluctuations, characterized by relatively short circumferential correlation lengths and uniformity over the aft fuselage, were represented using Efimtsov empirical correlation functions. Model variance was predicted using the Langley method and combined with estimates of measurement uncertainty to verify the prediction process.

  20. Probabilistic Structural Analysis of the SRB Aft Skirt External Fitting Modification

    NASA Technical Reports Server (NTRS)

    Townsend, John S.; Peck, J.; Ayala, S.

    1999-01-01

    NASA has funded several major programs (the PSAM Project is an example) to develop Probabilistic Structural Analysis Methods and tools for engineers to apply in the design and assessment of aerospace hardware. A probabilistic finite element design tool, known as NESSUS, is used to determine the reliability of the Space Shuttle Solid Rocket Booster (SRB) aft skirt critical weld. An external bracket modification to the aft skirt provides a comparison basis for examining the details of the probabilistic analysis and its contributions to the design process.

  1. STS-35 MS Hoffman operates ASTRO-1 MPC on OV-102's aft flight deck

    NASA Technical Reports Server (NTRS)

    1990-01-01

    STS-35 Mission Specialist (MS) Jeffrey A. Hoffman, wearing headset and monitoring closed circuit television (CCTV) display screen, operates the Astronomy Laboratory 1 (ASTRO-1) manual pointing controller (MPC) on the aft flight deck of Columbia, Orbiter Vehicle (OV) 102. MPC is used to position the instrument pointing system (IPS) and its three ultraviolet telescopes in OV-102's payload bay (PLB). Hoffman and other crewmembers were able to command the IPS to record astronomical data using the MPC. At Hoffman's left are the onorbit station control panels and the two aft flight deck viewing windows W9 and W10.

  2. Probabilistic Structural Analysis of the Solid Rocket Booster Aft Skirt External Fitting Modification

    NASA Technical Reports Server (NTRS)

    Townsend, John S.; Peck, Jeff; Ayala, Samuel

    2000-01-01

    NASA has funded several major programs (the Probabilistic Structural Analysis Methods Project is an example) to develop probabilistic structural analysis methods and tools for engineers to apply in the design and assessment of aerospace hardware. A probabilistic finite element software code, known as Numerical Evaluation of Stochastic Structures Under Stress, is used to determine the reliability of a critical weld of the Space Shuttle solid rocket booster aft skirt. An external bracket modification to the aft skirt provides a comparison basis for examining the details of the probabilistic analysis and its contributions to the design process. Also, analysis findings are compared with measured Space Shuttle flight data.

  3. Light cone matrix product

    SciTech Connect

    Hastings, Matthew B

    2009-01-01

    We show how to combine the light-cone and matrix product algorithms to simulate quantum systems far from equilibrium for long times. For the case of the XXZ spin chain at {Delta} = 0.5, we simulate to a time of {approx} 22.5. While part of the long simulation time is due to the use of the light-cone method, we also describe a modification of the infinite time-evolving bond decimation algorithm with improved numerical stability, and we describe how to incorporate symmetry into this algorithm. While statistical sampling error means that we are not yet able to make a definite statement, the behavior of the simulation at long times indicates the appearance of either 'revivals' in the order parameter as predicted by Hastings and Levitov (e-print arXiv:0806.4283) or of a distinct shoulder in the decay of the order parameter.

  4. Epigenetics as a First Exit Problem

    NASA Astrophysics Data System (ADS)

    Aurell, E.; Sneppen, K.

    2002-01-01

    We develop a framework to discuss the stability of epigenetic states as first exit problems in dynamical systems with noise. We consider in particular the stability of the lysogenic state of the λ prophage. The formalism defines a quantitative measure of robustness of inherited states.

  5. USEPA EXAMPLE EXIT LEVEL ANALYSIS RESULTS

    EPA Science Inventory

    Developed by NERL/ERD for the Office of Solid Waste, the enclosed product provides an example uncertainty analysis (UA) and initial process-based sensitivity analysis (SA) of hazardous waste "exit" concentrations for 7 chemicals and metals using the 3MRA Version 1.0 Modeling Syst...

  6. Shatter cones: Diagnostic impact signatures

    NASA Technical Reports Server (NTRS)

    Mchone, J. F.; Dietz, R. S.

    1988-01-01

    Uniquely fractured target rocks known as shatter cones are associated with more than one half the world's 120 or so presently known impact structures. Shatter cones are a form of tensile rock failure in which a positive conical plug separates from a negative outer cup or mold and delicate ornaments radiating from an apex are preserved on surfaces of both portions. Although distinct, shatter cones are sometimes confused with other striated geologic features such as ventifacts, stylolites, cone-in-cone, slickensides, and artificial blast plumes. Complete cones or solitary cones are rare, occurrences are usually as swarms in thoroughly fractured rock. Shatter cones may form in a zone where an expanding shock wave propagating through a target decays to form an elastic wave. Near this transition zone, the expanding primary wave may strike a pebble or other inhomogeneity whose contrasting transmission properties produce a scattered secondary wave. Interference between primary and secondary scattered waves produce conical stress fields with axes perpendicular to the plane of an advancing shock front. This model supports mechanism capable of producing such shatter cone properties as orientation, apical clasts, lithic dependence, and shock pressure zonation. Although formational mechanics are still poorly understood, shatter cones have become the simplest geologic field criterion for recognizing astroblemes (ancient terrestrial impact structures).

  7. Shatter cones: Diagnostic impact signatures

    NASA Astrophysics Data System (ADS)

    McHone, J. F.; Dietz, R. S.

    Uniquely fractured target rocks known as shatter cones are associated with more than one half the world's 120 or so presently known impact structures. Shatter cones are a form of tensile rock failure in which a positive conical plug separates from a negative outer cup or mold and delicate ornaments radiating from an apex are preserved on surfaces of both portions. Although distinct, shatter cones are sometimes confused with other striated geologic features such as ventifacts, stylolites, cone-in-cone, slickensides, and artificial blast plumes. Complete cones or solitary cones are rare, occurrences are usually as swarms in thoroughly fractured rock. Shatter cones may form in a zone where an expanding shock wave propagating through a target decays to form an elastic wave. Near this transition zone, the expanding primary wave may strike a pebble or other inhomogeneity whose contrasting transmission properties produce a scattered secondary wave. Interference between primary and secondary scattered waves produce conical stress fields with axes perpendicular to the plane of an advancing shock front. This model supports mechanism capable of producing such shatter cone properties as orientation, apical clasts, lithic dependence, and shock pressure zonation. Although formational mechanics are still poorly understood, shatter cones have become the simplest geologic field criterion for recognizing astroblemes (ancient terrestrial impact structures).

  8. Effect of exit locations on ants escaping a two-exit room stressed with repellent

    NASA Astrophysics Data System (ADS)

    Wang, Shujie; Cao, Shuchao; Wang, Qiao; Lian, Liping; Song, Weiguo

    2016-09-01

    In order to investigate the effect of the distance between two exits on ant evacuation efficiency and the behavior of ants escaping from a two-exit room, we conducted ant egress experiments using Camponotus japonicus in multiple situations. We found that the ants demonstrated the phenomenon of ;symmetry breaking; in this stress situation. It was also shown that different locations for the exits obviously affected the ants' egress efficiency by measuring the time intervals between individual egress and flow rate in eight repeated experiments, each of which contained five different distance between the two exits. In addition, it is demonstrated that there are differences between the predictions of Social Force Model of pedestrians and the behaviors of ants in stress conditions through comparing some important behavioral features, including position, trajectory, velocity, and density map.

  9. Exit from exit: resetting the cell cycle through Amn1 inhibition of G protein signaling.

    PubMed

    Wang, Yanchang; Shirogane, Takahiro; Liu, Dou; Harper, J Wade; Elledge, Stephen J

    2003-03-07

    In S. cerevisiae cells undergoing anaphase, a ras-related GTPase, Tem1, is located on the spindle pole body that enters the daughter cell and activates a signal transduction pathway, MEN, to allow mitotic exit. MEN activation must be reversed after mitotic exit to reset the cell cycle in G1. We find that daughter cells activate an Antagonist of MEN pathway (AMEN) in part through induction of the Amn1 protein that binds directly to Tem1 and prevents its association with its target kinase Cdc15. Failure of Amn1 function results in defects of both the spindle assembly and nuclear orientation checkpoints and delays turning off Cdc14 in G1. Thus, Amn1 is part of a daughter-specific switch that helps cells exit from mitotic exit and reset the cell cycle.

  10. 78 FR 35747 - Special Conditions: Cirrus Design Corporation, Model SF50; Fire Extinguishing for Upper Aft...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-14

    ..., Small Airplane Directorate, Aircraft Certification Service, 901 Locust, Room 301, Kansas City, MO 64106..., retractable gear, carbon composite, airplane with one turbofan engine mounted partially in the upper aft.... Issued in Kansas City, Missouri on June 5, 2013. Earl Lawrence, Small Airplane Directorate,...

  11. Looking Back, Looking Ahead: A Reflection on Paraprofessionals and the AFT

    ERIC Educational Resources Information Center

    Johnson, Loretta

    2016-01-01

    In this article, secretary-treasurer of the American Federation of Teachers (AFT) Lorretta Johnson reflects on her early work as a paraprofessional at Liberty Elementary School (Baltimore, Maryland) and what sparked her union activism nearly 50 years ago in 1966. It was that year that she and her colleagues joined the Baltimore Teachers Union…

  12. STS-32 Commander Brandenstein celebrates birthday on OV-102's aft flight deck

    NASA Technical Reports Server (NTRS)

    1990-01-01

    STS-32 Commander Daniel C. Brandenstein, wearing eye glasses, holds inflated plastic birthday cake during a celebration on Columbia's, Orbiter Vehicle (OV) 102's, aft flight deck. Two of the candles on the cake have collapsed as Brandenstein smiles and wonders whether to blow down the rest.

  13. 28. SONAR CONTROL ROOM FORWARD LOOKING AFT SHOWING AN/SQS23G ...

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

    28. SONAR CONTROL ROOM - FORWARD LOOKING AFT SHOWING AN/SQS-23G DETECTING-RANGING SET, MARK & CONTROL PANEL, CAN-55134 RECORDER, SPEED INDICATOR, VARIOUS ALARMS AND INTERNAL COMMUNICATION CIRCUITS. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  14. STS-27 Pilot Gardner works with cameras on aft flight deck at window W8

    NASA Technical Reports Server (NTRS)

    1988-01-01

    Pilot Guy S. Gardner holds ARRIFLEX 16mm motion picture camera in his right hand and a 70mm still camera in his left hand as another 70mm camera and a 35mm camera float around him. Gardner tries to position the cameras at aft flight deck overhead window W8.

  15. Enabling a Better Aft Heat Shield Solution for Future Mars Science Laboratory Class Vehicles

    NASA Technical Reports Server (NTRS)

    McGuire, Mary K.; Covington, Melmoth A.; Goldstein, Howard E.; Arnold, James O.; Beck, Robin

    2013-01-01

    System studies are described that compare masses and estimated manufacturing costs of options for the as-flown Mars Science Laboratory (MSL) aft body Thermal Light Weight Ablator (SLA) 561-V and its thickness was not optimized using the standard TPS Sizer Tool widely used for heat shield design. Use of the TPS sizing tool suggests that optimization of the SLA thickness could reduce the aft heat shield mass by 40 percent. Analysis of the predicted aft-shell aerothermodynamics suggests that the bulk of MSL class entry vehicle heat shields could incorporate Advanced Flexible Reusable Surface Insulation (AFRSI). AFRSI has a wellestablished record of relatively inexpensive manufacturing and flight certification based on its use on the lee side of the Space Shuttle. Runs with the TPS Sizer show that the AFRSI solution would be 60 percent lighter than the as-flown SLA. The issue of Reaction Control System (RCS) heating on the aft shell could be addressed by locally impregnating the AFRSI with silicone to enhance its robustness to short bursts ofheating. Stagnation point arcjet testing has shown that silicone impregnated AFRSI performs well at heat rates of 115 W/cm2 and 0.1 atmospheres for a duration of 40 seconds, far beyond conditions that are expected for MSL class vehicles. The paper concludes with a discussion of manufacturing processes for AFRSI, impregnation approaches and relative cost comparisons to the SLA solution.

  16. Astronauts Walz and Newman in STS-51 Discovery's aft flight deck

    NASA Technical Reports Server (NTRS)

    1993-01-01

    Astronauts Carl E. Walz (left) and James H. Newman are pictured on Discovery's aft flight deck near two experiments. Positioned in the window above Walz's head is the Auroral Photography Experiment (APE-B), while the High Resolution Shuttle Glow Spectroscopy (HRSGS-A) experiment is deployed in the other window.

  17. View forward to aft of compartment B126. Note steam powered ...

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

    View forward to aft of compartment B-126. Note steam powered windlass for ash hoist that services boiler room compartment B-3 and compartment B-4. Ash hoist conveyor rail is at top left. Diving suit and helmet dating from 1950's is displayed in case at center of photograph. (049) - USS Olympia, Penn's Landing, 211 South Columbus Boulevard, Philadelphia, Philadelphia County, PA

  18. 75 FR 20516 - Special Conditions: Cirrus Design Corporation, Model SF50; Fire Extinguishing for Upper Aft...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-20

    ...; Fire Extinguishing for Upper Aft Fuselage Mounted Engine AGENCY: Federal Aviation Administration (FAA... protect such installed engines from fires, were not envisioned in the development of the part 23 normal... fire extinguishing system for the engine on the model SF50 is required. Regulations requiring...

  19. The Bargaining Table and Beyond: How the AFT Came to Support Labor-Management Collaboration

    ERIC Educational Resources Information Center

    Kugler, Phil

    2014-01-01

    When he first came to the American Federation of Teachers (AFT) in 1973, reports Phil Kugler, there was no such thing as labor-management collaboration. It was a term he had never heard of, and no one used it. Back then, the focus was on supporting local unions in their struggles to win collective bargaining rights. At the time, teachers were…

  20. View forward to aft of dynamo room (compartment A21) showing ...

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

    View forward to aft of dynamo room (compartment A-21) showing port ventilation fan; electrical generator is at left center of photograph. Platform for generator is at bottom center of photograph. Hatch for passing powder up from magazine is located just above the generator base. Frames support armored protective deck. (018) - USS Olympia, Penn's Landing, 211 South Columbus Boulevard, Philadelphia, Philadelphia County, PA

  1. 3. EXUSS HORNET CVS12 AERIAL VIEW FROM STARBOARD AFT QUARTER, ...

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

    3. EX-USS HORNET CVS-12 AERIAL VIEW FROM STARBOARD AFT QUARTER, EX-USS ORISKANY CV-34 RIGHT SIDE OF PHOTO, EX-USS JERSEY BB-62 AND OTHER INACTIVE SHIPS MOORED ACROSS PIER FROM HORNET. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

  2. STS-39 MS Veach monitors AFP-675 panel on OV-103's aft flight deck

    NASA Technical Reports Server (NTRS)

    1991-01-01

    STS-39 Mission Specialist (MS) Charles L. Veach analyzes data displayed on Air Force Program 675 (APF-675) command and monitor panel on the aft flight deck payload station aboard Discovery, Orbiter Vehicle (OV) 103. Just above Veach's head, Panel A3 closed circuit television (CCTV) screen A2 glows. At Veach's right is a portable laptop computer attached to panel L10.

  3. STS-26 Commander Hauck poses on shuttle mockup aft flight deck

    NASA Technical Reports Server (NTRS)

    1988-01-01

    STS-26 Discovery, Orbiter Vehicle (OV) 103, Commander Frederick H. Hauck poses on shuttle mockup aft flight deck in the Shuttle Mockup and Integration Laboratory Bldg 9A. Hauck's right hand is propped on Onorbit Station control panel A2 remote manipulator system (RMS) translation hand control. Photograph was taken by Keith Meyers of the NEW YORK TIMES.

  4. STS-40 Columbia, OV-102, payload bay aft firewall and thermal insulation

    NASA Technical Reports Server (NTRS)

    1991-01-01

    STS-40 Columbia, Orbiter Vehicle (OV) 102, payload bay (PLB) aft firewall is documented to show a loose piece of thermal insulation. The crew discovered the loose blanket soon after opening the PLB doors on 06-05-91. The vertical tail and the left orbital maneuvering system (OMS) pod are visible above the bulkhead.

  5. The EXIT (ex utero intrapartum treatment) procedure.

    PubMed

    Chiu, Hsin-Hui; Hsu, Wei-Chung; Shih, Jin-Chung; Tsao, Po-Nien; Hsieh, Wu-Shiun; Chou, Hung-Chieh

    2008-09-01

    Fetuses with upper airway obstruction have a high mortality rate if proper airway management is not immediately administered after delivery. The EXIT (ex utero intrapartum treatment) procedure is a new technique that establishes the fetal airway while uteroplacental circulation is still maintained. The prognosis of such neonates has much improved after the introduction of this procedure. We report two neonates with prenatal diagnosis of upper airway obstruction; they were born smoothly via the EXIT procedure. The first was a case of epignathus, a rare type of nasopharyngeal or oropharyngeal teratoma derived from all three germ cell layers with variable maturity. The second was a case of giant lymphangioma that resulted from localized malformations in the development of the lymphatic system. Furthermore, compared with routine cesarean section, the short-term maternal outcomes were not different with regard to infection rate, estimated blood loss, wound complication, and postpartum hospital stay.

  6. Low-noise fan exit guide vanes

    NASA Technical Reports Server (NTRS)

    Jones, Michael G. (Inventor); Parrott, Tony L. (Inventor); Heidelberg, Laurence J. (Inventor); Envia, Edmane (Inventor)

    2008-01-01

    Low-noise fan exit guide vanes are disclosed. According to the present invention a fan exit guide vane has an outer shell substantially shaped as an airfoil and defining an interior cavity. A porous portion of the outer shell allows communication between the fluctuations in the air passing over the guide vane and the interior cavity. At least one acoustically resonant chamber is located within the interior cavity. The resonant chamber is in communication with the porous portion of the outer perimeter. The resonant chamber is configured to reduce the noise generated at a predetermined frequency. In various preferred embodiments, there is a plurality of acoustically resonant chambers located within the interior cavity. The resonant chambers can be separated by one or more partitions within the interior cavity. In these embodiments, the resonant chambers can be configured to reduce the noise generated over a range of predetermined frequencies.

  7. Dynamic exit pupil trackers for autostereoscopic displays.

    PubMed

    Akşit, Kaan; Baghsiahi, Hadi; Surman, Phil; Ölçer, Selim; Willman, Eero; Selviah, David R; Day, Sally; Urey, Hakan

    2013-06-17

    This paper describes the first demonstrations of two dynamic exit pupil (DEP) tracker techniques for autostereoscopic displays. The first DEP tracker forms an exit pupil pair for a single viewer in a defined space with low intraocular crosstalk using a pair of moving shutter glasses located within the optical system. A display prototype using the first DEP tracker is constructed from a pair of laser projectors, pupil-forming optics, moving shutter glasses at an intermediate pupil plane, an image relay lens, and a Gabor superlens based viewing screen. The left and right eye images are presented time-sequentially to a single viewer and seen as a 3D image without wearing glasses and allows the viewer to move within a region of 40 cm × 20 cm in the lateral plane, and 30 cm along the axial axis. The second DEP optics can move the exit pupil location dynamically in a much larger 3D space by using a custom spatial light modulator (SLM) forming an array of shutters. Simultaneous control of multiple exit pupils in both lateral and axial axes is demonstrated for the first time and provides a viewing volume with an axial extent of 0.6-3 m from the screen and within a lateral viewing angle of ± 20° for multiple viewers. This system has acceptable crosstalk (< 5%) between the stereo image pairs. In this novel version of the display the optical system is used as an advanced dynamic backlight for a liquid crystal display (LCD). This has advantages in terms of overall display size as there is no requirement for an intermediate image, and in image quality. This system has acceptable crosstalk (< 5%) between the stereo image pairs.

  8. Exit slit mirrors for the ebert spectrometer.

    PubMed

    Fastie, W G

    1972-09-01

    The use of a very long straight entrance slit in an Ebert grating spectrometer with two plane mirrors at the shorter exit slit to increase the energy density is described. This system has been employed in a far uv rocket spectrometer to provide higher sensitivity than has been achieved previously. The imaging properties and required slit and mirror adjustments are presented. Experimental results are included.

  9. 14 CFR 25.811 - Emergency exit marking.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... must be conspicuously marked. (b) The identity and location of each passenger emergency exit must be..., Type C or Type I passenger emergency exit operating handle must— (i) Be self-illuminated with...

  10. 14 CFR 25.811 - Emergency exit marking.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... must be conspicuously marked. (b) The identity and location of each passenger emergency exit must be..., Type C or Type I passenger emergency exit operating handle must— (i) Be self-illuminated with...

  11. 14 CFR 25.811 - Emergency exit marking.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... must be conspicuously marked. (b) The identity and location of each passenger emergency exit must be..., Type C or Type I passenger emergency exit operating handle must— (i) Be self-illuminated with...

  12. Evolution of Vortex Rings Exiting Inclined Cylinders

    NASA Astrophysics Data System (ADS)

    Longmire, E. K.; Webster, D. R.; Reetz, M.; Gefroh, D.

    1996-11-01

    Vortex rings initiated in cylinders with exit incline lengths of 0, D/4, and D/2 were investigated for Reynolds numbers up to 30,000. The fluid exiting each cylinder was visualized with an ionized bromothymol blue solution, and velocity fields were obtained with PIV. In each inclined case, vortex rings form at angles smaller than the cylinder incline angle. Entrainment of ambient fluid on the short side of the cylinder is much stronger than that on the long side. This results in a larger circulation about the short side of the ring and a greater propagation velocity on that side. The incline angle of the ring thus decreases as it moves downstream. Behind the ring core, an impulsive wave of entrained ambient fluid flows parallel to the cylinder exit plane. Some of this fluid is wrapped into the core, while the rest is ejected outward past the long cylinder edge. The vortex ring dynamics differ significantly from those observed in jets from inclined nozzles where neighboring rings are connected by straining zones, and ring incline angles increase with downstream distance.

  13. Undulated Nozzle for Enhanced Exit Area Mixing

    NASA Technical Reports Server (NTRS)

    Seiner, John M. (Inventor); Gilinsky, Mikhail M. (Inventor)

    2000-01-01

    A nozzle having an undulating surface for enhancing the mixing of a primary flow with a secondary flow or ambient air, without requiring an ejector. The nozzle includes a nozzle structure and design for introducing counter-rotating vorticity into the primary flow either through (i) internal surface corrugations where an axisymmetric line through each corrugation is coincident with an axisymmetric line through the center of the flow passageway or (ii) through one or more sets of alternating convexities and cavities in the internal surface of the nozzle where an axisymmetric line through each convexity and cavity is coincident with an axisymmetric line through the center of the flow passageway, and where the convexities contract from the entrance end towards the exit end. Exit area mixing is also enhanced by one or more chevrons attached to the exit edge of the nozzle. The nozzle is ideally suited for application as a jet engine nozzle. When used as a jet engine nozzle, noise suppression with simultaneous thrust augmentation/minimal thrust loss is achieved.

  14. Plume effects on the flow around a blunted cone at hypersonic speeds

    NASA Technical Reports Server (NTRS)

    Atcliffe, P.; Kumar, D.; Stollery, J. L.

    1992-01-01

    Tests at M = 8.2 show that a simulated rocket plume at the base of a blunted cone can cause large areas of separated flow, with dramatic effects on the heat transfer rate distribution. The plume was simulated by solid discs of varying sizes or by an annular jet of gas. Flow over the cone without a plume is fully laminar and attached. Using a large disc, the boundary layer is laminar at separation at the test Reynolds number. Transition occurs along the separated shear layer and the boundary layer quickly becomes turbulent. The reduction in heat transfer associated with a laminar separated region is followed by rising values as transition occurs and the heat transfer rates towards the rear of the cone substantially exceed the values obtained without a plume. With the annular jet or a small disc, separation occurs much further aft, so that heat transfer rates at the front of the cone are comparable with those found without a plume. Downstream of separation the shear layer now remains laminar and the heat transfer rates to the surface are significantly lower than the attached flow values.

  15. 46 CFR 78.47-40 - Exit signs.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 3 2011-10-01 2011-10-01 false Exit signs. 78.47-40 Section 78.47-40 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PASSENGER VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. § 78.47-40 Exit signs. (a) Illuminated exit signs are required and must...

  16. 46 CFR 78.47-40 - Exit signs.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 3 2010-10-01 2010-10-01 false Exit signs. 78.47-40 Section 78.47-40 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PASSENGER VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. § 78.47-40 Exit signs. (a) Illuminated exit signs are required and must...

  17. 14 CFR 29.811 - Emergency exit marking.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... head twice the width of the shaft, extending along at least 70 degrees of arc at a radius approximately... Accommodations § 29.811 Emergency exit marking. (a) Each passenger emergency exit, its means of access, and its... each passenger emergency exit must be recognizable from a distance equal to the width of the cabin....

  18. 14 CFR 23.813 - Emergency exit access.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Emergency exit access. 23.813 Section 23... Personnel and Cargo Accommodations § 23.813 Emergency exit access. (a) For commuter category airplanes, access to window-type emergency exits may not be obstructed by seats or seat backs. (b) In addition,...

  19. 14 CFR 25.813 - Emergency exit access.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Emergency exit access. 25.813 Section 25... Emergency exit access. Each required emergency exit must be accessible to the passengers and located where... following must be provided for each Type III or Type IV exit—(1) There must be access from the nearest...

  20. Profile of State High School Exit Exam Policies. Florida

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Florida's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  1. Profile of State High School Exit Exam Policies. Connecticut

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Connecticut's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  2. Profile of State High School Exit Exam Policies. Oklahoma

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Oklahoma's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  3. Profile of State High School Exit Exam Policies. Massachusetts

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Massachusetts' high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam…

  4. Profile of State High School Exit Exam Policies. Louisiana

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Louisiana's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  5. Profile of State High School Exit Exam Policies. Minnesota

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Minnesota's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  6. Profile of State High School Exit Exam Policies. Virginia

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Virginia's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  7. Profile of State High School Exit Exam Policies. Alaska

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Alaska's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  8. Profile of State High School Exit Exam Policies. New York

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on New York's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  9. Profile of State High School Exit Exam Policies. Ohio

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Ohio's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  10. Profile of State High School Exit Exam Policies. Nevada

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Nevada's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  11. Profile of State High School Exit Exam Policies. Alabama

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Alabama's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  12. Profile of State High School Exit Exam Policies. North Carolina

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on North Carolina's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam…

  13. Profile of State High School Exit Exam Policies. Washington

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Washington's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  14. Profile of State High School Exit Exam Policies. Arizona

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Arizona's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  15. Profile of State High School Exit Exam Policies. Tennessee

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Tennessee's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  16. Profile of State High School Exit Exam Policies. South Carolina

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on South Carolina's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam…

  17. Profile of State High School Exit Exam Policies. Mississippi

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Mississippi's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  18. Profile of State High School Exit Exam Policies. New Jersey

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on New Jersey's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  19. Profile of State High School Exit Exam Policies. Delaware

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Delaware's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  20. Profile of State High School Exit Exam Policies. New Mexico

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on New Mexico's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  1. Profile of State High School Exit Exam Policies. Indiana

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Indiana's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  2. Profile of State High School Exit Exam Policies. Idaho

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Idaho's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  3. Profile of State High School Exit Exam Policies. Arkansas

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Arkansas' high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  4. Profile of State High School Exit Exam Policies. Missouri

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Missouri's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  5. Profile of State High School Exit Exam Policies. Rhode Island

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Rhode Island's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam…

  6. Profile of State High School Exit Exam Policies. Maryland

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Maryland's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  7. Profile of State High School Exit Exam Policies. Georgia

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Georgia's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  8. Profile of State High School Exit Exam Policies. California

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on California's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  9. Profile of State High School Exit Exam Policies. Texas

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Texas' high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  10. Profile of State High School Exit Exam Policies. Oregon

    ERIC Educational Resources Information Center

    Center on Education Policy, 2011

    2011-01-01

    This individual profile provides information on Oregon's high school exit exam standards and policies. Some of the categories presented include: (1) State exit exam policy; (2) Type of Test; (3) Purpose; (4) Major changes in exit exam policy since the 2009-10 school year for financial reasons; (5) Subjects tested on exam; (6) Grade exam first…

  11. EOS Terra Terra Constellation Exit/Future Maneuver Plans Update

    NASA Technical Reports Server (NTRS)

    Mantziaras, Dimitrios

    2016-01-01

    This EOS Terra Constellation Exit/Future Maneuver Plans Update presentation will discuss brief history of Terra EOM work; lifetime fuel estimates; baseline vs. proposed plan origin; resultant exit orbit; baseline vs. proposed exit plan; long term orbit altitude; revised lifetime proposal and fallback options.

  12. Exit Cards: Creating a Dialogue for Continuous Evaluation

    ERIC Educational Resources Information Center

    Patka, Mazna; Wallin-Ruschman, Jennifer; Wallace, Tenille; Robbins, Candice

    2016-01-01

    This study explored the use of Exit Cards, which are formative evaluations of student knowledge and instruction undertaken at every class meeting. Its results are based on Exit Card data from two undergraduate research methods courses. Thematic analysis indicated that students used Exit Cards to communicate (1) what they learned, (2) challenges…

  13. The Holographic Entropy Cone

    SciTech Connect

    Bao, Ning; Nezami, Sepehr; Ooguri, Hirosi; Stoica, Bogdan; Sully, James; Walter, Michael

    2015-09-21

    We initiate a systematic enumeration and classification of entropy inequalities satisfied by the Ryu-Takayanagi formula for conformal field theory states with smooth holographic dual geometries. For 2, 3, and 4 regions, we prove that the strong subadditivity and the monogamy of mutual information give the complete set of inequalities. This is in contrast to the situation for generic quantum systems, where a complete set of entropy inequalities is not known for 4 or more regions. We also find an infinite new family of inequalities applicable to 5 or more regions. The set of all holographic entropy inequalities bounds the phase space of Ryu-Takayanagi entropies, defining the holographic entropy cone. We characterize this entropy cone by reducing geometries to minimal graph models that encode the possible cutting and gluing relations of minimal surfaces. We find that, for a fixed number of regions, there are only finitely many independent entropy inequalities. To establish new holographic entropy inequalities, we introduce a combinatorial proof technique that may also be of independent interest in Riemannian geometry and graph theory.

  14. The Holographic Entropy Cone

    DOE PAGES

    Bao, Ning; Nezami, Sepehr; Ooguri, Hirosi; ...

    2015-09-21

    We initiate a systematic enumeration and classification of entropy inequalities satisfied by the Ryu-Takayanagi formula for conformal field theory states with smooth holographic dual geometries. For 2, 3, and 4 regions, we prove that the strong subadditivity and the monogamy of mutual information give the complete set of inequalities. This is in contrast to the situation for generic quantum systems, where a complete set of entropy inequalities is not known for 4 or more regions. We also find an infinite new family of inequalities applicable to 5 or more regions. The set of all holographic entropy inequalities bounds the phasemore » space of Ryu-Takayanagi entropies, defining the holographic entropy cone. We characterize this entropy cone by reducing geometries to minimal graph models that encode the possible cutting and gluing relations of minimal surfaces. We find that, for a fixed number of regions, there are only finitely many independent entropy inequalities. To establish new holographic entropy inequalities, we introduce a combinatorial proof technique that may also be of independent interest in Riemannian geometry and graph theory.« less

  15. Kinematics of Cone-In-Cone Growth, with Implications for Timing and Formation Mechanism

    NASA Astrophysics Data System (ADS)

    Hooker, J. N.; Cartwright, J. A.

    2015-12-01

    Cone-in-cone is an enigmatic structure. Similar to many fibrous calcite veins, cone-in-cone is generally formed of calcite and present in bedding-parallel vein-like accumulations within fine-grained rocks. Unlike most fibrous veins, cone-in-cone contains conical inclusions of host-rock material, creating nested, parallel cones throughout. A long-debated aspect of cone-in-cone structures is whether the calcite precipitated with its conical form (primary cone-in-cone), or whether the cones formed afterwards (secondary cone-in-cone). Trace dolomite within a calcite cone-in-cone structure from the Cretaceous of Jordan supports the primary hypothesis. The host sediment is a siliceous mud containing abundant rhombohedral dolomite grains. Dolomite rhombohedra are also distributed throughout the cone-in-cone. The rhombohedra within the cones are randomly oriented yet locally have dolomite overgrowths having boundaries that are aligned with calcite fibers. Evidence that dolomite co-precipitated with calcite, and did not replace calcite, includes (i) preferential downward extension of dolomite overgrowths, in the presumed growth-direction of the cone-in-cone, and (ii) planar, vertical borders between dolomite crystals and calcite fibers. Because dolomite overgrows host-sediment rhombohedra and forms fibers within the cones, it follows that the host-sediment was included within the growing cone-in-cone as the calcite precipitated, and not afterward. The host-sediment was not injected into the cone-in-cone along fractures, as the secondary-origin hypothesis suggests. This finding implies that cone-in-cone in general does not form over multiple stages, and thus has greater potential to preserve the chemical signature of its original precipitation. Because cone-in-cone likely forms before complete lithification of the host, and because the calcite displaces the host material against gravity, this chemical signature can preserve information about early overpressures in fine

  16. The yeast Aft2 transcription factor determines selenite toxicity by controlling the low affinity phosphate transport system

    PubMed Central

    Pérez-Sampietro, María; Serra-Cardona, Albert; Canadell, David; Casas, Celia; Ariño, Joaquín; Herrero, Enrique

    2016-01-01

    The yeast Saccharomyces cerevisiae is employed as a model to study the cellular mechanisms of toxicity and defense against selenite, the most frequent environmental selenium form. We show that yeast cells lacking Aft2, a transcription factor that together with Aft1 regulates iron homeostasis, are highly sensitive to selenite but, in contrast to aft1 mutants, this is not rescued by iron supplementation. The absence of Aft2 strongly potentiates the transcriptional responses to selenite, particularly for DNA damage- and oxidative stress-responsive genes, and results in intracellular hyperaccumulation of selenium. Overexpression of PHO4, the transcriptional activator of the PHO regulon under low phosphate conditions, partially reverses sensitivity and hyperaccumulation of selenite in a way that requires the presence of Spl2, a Pho4-controlled protein responsible for post-transcriptional downregulation of the low-affinity phosphate transporters Pho87 and Pho90. SPL2 expression is strongly downregulated in aft2 cells, especially upon selenite treatment. Selenite hypersensitivity of aft2 cells is fully rescued by deletion of PHO90, suggesting a major role for Pho90 in selenite uptake. We propose that the absence of Aft2 leads to enhanced Pho90 function, involving both Spl2-dependent and independent events and resulting in selenite hyperaccumulation and toxicity. PMID:27618952

  17. Making An Impact: Shatter Cones

    ERIC Educational Resources Information Center

    Blank, Lisa M.; Plautz, Michael R.; Crews, Jeffrey W.

    2004-01-01

    In 1990, a group of geologists discovered a large number of shatter cones in southwestern Montana. Shatter cones are a type of metamorphosed rock often found in impact structures (the remains of a crater after a meteor impact and years of Earth activity). Scientists have discovered only 168 impact craters around the world. If rocks could talk,…

  18. Laser range profile of cones

    NASA Astrophysics Data System (ADS)

    Zhou, Wenzhen; Gong, Yanjun; Wang, Mingjun; Gong, Lei

    2016-10-01

    technology. Laser one-dimensional range profile can reflect the characteristics of the target shape and surface material. These techniques were motivated by applications of laser radar to target discrimination in ballistic missile defense. The radar equation of pulse laser about cone is given in this paper. This paper demonstrates the analytical model of laser one-dimensional range profile of cone based on the radar equation of the pulse laser. Simulations results of laser one-dimensional range profiles of some cones are given. Laser one-dimensional range profiles of cone, whose surface material with diffuse lambertian reflectance, is given in this paper. Laser one-dimensional range profiles of cone, whose surface mater with diffuse materials whose retroreflectance can be modeled closely with an exponential term that decays with increasing incidence angles, is given in this paper. Laser one-dimensional range profiles of different pulse width of cone is given in this paper. The influences of surface material, pulse width, attitude on the one-dimensional range are analyzed. The laser two-dimensional range profile is two-dimensional scattering imaging of pulse laser of target. The two-dimensional range profile of roughness target can provide range resolved information. An analytical model of two-dimensional laser range profile of cone is proposed. The simulations of two-dimensional laser range profiles of some cones are given. Laser two-dimensional range profiles of cone, whose surface mater with diffuse lambertian reflectance, is given in this paper. Laser two-dimensional range profiles of cone, whose surface mater with diffuse materials whose retroreflectance can be modeled closely with an exponential term that decays with increasing incidence angles, is given in this paper. The influence of pulse width, surface material on laser two-dimensional range profile is analyzed. Laser one-dimensional range profile and laser two-dimensional range profile are called as laser

  19. Solids flow pattern in the exit region of a CFB -- Furnace influence of exit geometry

    SciTech Connect

    Johnsson, F.; Leckner, B.; Vrager, A.

    1999-07-01

    The effect of the exit geometry on the flow pattern in a circulating fluidized bed (CFB) riser was studied in a cold 1/9 scale model of the Chalmers 12 MW CFB boiler. The model, which is made of transparent perspex, was operated according to the simplified scaling laws proposed by Glicksman et al. (1993). 12 different exit configurations were compared at different fluidization velocities. Two bed materials were used: iron and steel. In order to verify the scaling laws, vertical pressure and density profiles, net solids flux and pressure fluctuations measured in the model were compared with corresponding results from the 12 MW boiler. The exit configurations were evaluated by comparing the net solids fluxes and the vertical pressure and density profiles of the riser. The overall flow behavior of the scale-model was found to be similar to that of the boiler: A dense bottom bed, a splash zone and a transport zone could be identified. The dynamics (in-bed pressure fluctuations) of the bottom bed were in agreement with those of the boiler. Differences between net solids fluxes during operation with different exits were in some cases of an order of magnitude. However, there were almost no difference in solids flux between an abrupt exit, an extended exit (such as that of the boiler) and an enhanced extension. A decrease in the net solids flux (increase in the internal back-mixing) could be obtained by inserting obstacles in the upper part of the riser, and an increase in the net solids flux was achieved by narrowing the duct from the riser to the cyclone inlet (increasing the average velocity in the duct). The original configuration of the duct with an inclined bottom results in back-mixing from the duct to the furnace, thereby reducing the net (external) solids flux.

  20. Evaluation of two methods of prompting drivers to use specific exits on conflicts between vehicles at the critical exit.

    PubMed

    Van Houten, Ron; Malenfant, J E Louis; Zhao, Nan; Ko, Byungkon; Van Houten, Jonathan

    2005-01-01

    The Florida Department of Transportation used a series of changeable-message signs that functioned as freeway guide signs to divert traffic to Universal Theme Park via one of two eastbound exits based on traffic congestion at the first of the two exits. An examination of crashes along the entire route indicated a statistically significant increase in crashes at the first eastbound exit following the actuation of the system. Furthermore, all of the crashes occurred in close proximity to the exit gore (the crosshatched area at exits that drivers are not supposed to enter or traverse) at the first exit. In Experiment 1, behavioral data were collected using an alternating treatments design. These data revealed that reassigning the exit signs was effective in producing a change in the percentage of drivers using each of the two exits. These data also showed that the reassignment of the theme park exit was associated with an increase in the percentage of motor vehicle conflicts that consisted of vehicles cutting across the exit gore. An analysis revealed that the method used for switching the designated or active theme park exit on the series of changeable-message signs led to the presentation of conflicting messages to some motorists, thus resulting in erratic driving behavior (cutting across the exit gore). In Experiment 2, the treatment evaluated the use of a phased method of switching the designated theme park exit to eliminate the delivery of conflicting messages. The new method for switching the designated theme park exit was not associated with an increase in motorists cutting across the exit gore.

  1. Numerical study on the drag coefficient for an ellipsoidal bubble with fore-aft asymmetry

    NASA Astrophysics Data System (ADS)

    Sanada, Toshiyuki; Takagi, Shu; Saito, Takayuki

    2008-11-01

    We evaluate the drag coefficient for ellipsoidal clean bubbles rising steadily at high Re. Flow fields and bubble shapes are obtained using a numerical simulation. The method is based on a finite-difference solution of the equation s of motion on an orthogonal curvilinear coordinate system [Takagi et al., Phys. Fluids (1994), Ryskin & Leal, J. Fluid Mech. (1984)]. The degree of fore-aft asymmetric bubble shape is quantitatively evaluated using Legendre polynomials. The numerically obtained drag coefficients are compared with those of experimental results. In addition, by comparing the drag coefficients with those for symmetric ellipsoidal bubble obtained analytically by Moore [J. Fluid Mech. (1965)], and via numerical simulation by Blanco & Magnaudet [Phys. Fluids (1995)], the effect of fore-aft asymmetry on a drag coefficient is evaluated. Furthermore the formation of the standing eddy at the rear of deformable bubbles is discussed.

  2. Static and dynamic deflection studies of the SRM aft case-nozzle joint

    NASA Technical Reports Server (NTRS)

    Christian, David C.; Kos, Lawrence D.; Torres, Isaias

    1989-01-01

    The redesign of the joints on the solid rocket motor (SRM) has prompted the need for analyzing the behavior of the joints using several different types of analyses. The types of analyses performed include modal analysis, static analysis, transient response analysis, and base driving response analysis. The forces used in these analyses to drive the mathematical model include SRM internal chamber pressure, nozzle blowout and side forces, shuttle vehicle lift-off dynamics, SRM pressure transient rise curve, gimbal forces and moments, actuator gimbal loads, and vertical and radial bolt preloads. The math model represented the SRM from the aft base tangent point (1,823.95 in) all the way back to the nozzle, where a simplified, tuned nozzle model was attached. The new design used the radial bolts as an additional feature to reduce the gap opening at the aft dome/nozzle fixed housing interface.

  3. Aft-body loading function for penetrators based on the spherical cavity-expansion approximation.

    SciTech Connect

    Longcope, Donald B., Jr.; Warren, Thomas Lynn; Duong, Henry

    2009-12-01

    In this paper we develop an aft-body loading function for penetration simulations that is based on the spherical cavity-expansion approximation. This loading function assumes that there is a preexisting cavity of radius a{sub o} before the expansion occurs. This causes the radial stress on the cavity surface to be less than what is obtained if the cavity is opened from a zero initial radius. This in turn causes less resistance on the aft body as it penetrates the target which allows for greater rotation of the penetrator. Results from simulations are compared with experimental results for oblique penetration into a concrete target with an unconfined compressive strength of 23 MPa.

  4. Investigation of flow pattern downstream of spiral grooved runner cone in pump-turbine

    NASA Astrophysics Data System (ADS)

    Sano, T.; Maekawa, M.; Okamoto, N.; Yano, H.; Miyagawa, K.

    2012-11-01

    High amplitude of pressure fluctuation is observed in a draft tube of a hydraulic turbine and a pump-turbine, for the case of partial load operation. Several methods had been reported to mitigate the amplitude so far, such as, air or water injection to the draft tube, fins on the draft tube surface, or runner replacement with optimized velocity profile at runner exit. However, several problems for each method can be considered, such as, negative influence on efficiency, high cost, technical difficulties for installation, and so on. To solve these problems and satisfy the demand for mitigating the amplitude of pressure fluctuation simultaneously, a new runner cone with spiral grooves on the surface was developed. It was developed with unsteady draft tube calculation based on Design of Experiment (DOE) method, and the effect was confirmed by model tests. Finally, developed runner cone was installed to the prototype pump turbine, and predicted performance was confirmed by on-site tests. However, the reason why the grooved runner cone can mitigate the amplitude of pressure fluctuation in draft tube was not clarified. Therefore, numerical investigation focusing around runner cone was carried out. As a result, it was clarified that the velocity profile at runner outlet was modified by the grooved runner cone, such as, reverse flow downstream of runner cone and tangential velocity was reduced. It means the shear stress between main stream and dead water core region was weakened, therefore, it can be estimated that the amplitude of draft pressure fluctuation was reduced.

  5. STS-65 Japanese Payload Specialist Mukai on OV-102's aft flight deck

    NASA Technical Reports Server (NTRS)

    1994-01-01

    STS-65 Japanese Payload Specialist Chiaki Mukai freefloats on Columbia's, Orbiter Vehicle (OV) 102's, aft flight deck in front of overhead windows W7 and W8 while holding a cassette case with bean sprouts in her left hand. Mukai, a physician, represented Japan's National Space Development Agency (NASDA) on the two week mission in support of the International Microgravity Laboratory 2 (IML-2).

  6. Compartment A1, trim tanks viewed aft to forward from watertight ...

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

    Compartment A-1, trim tanks viewed aft to forward from watertight bulkhead no. 6. Using remotely controlled valves, the tanks could be flooded with water or pumped clear to compensate for variations in the ship's displacement and maintain the water line at the desired point. The trim tanks could also be used to counteract the effect of variations in sea water density. (02) - USS Olympia, Penn's Landing, 211 South Columbus Boulevard, Philadelphia, Philadelphia County, PA

  7. Propellant grain dynamics in aft attach ring of shuttle solid rocket booster

    NASA Technical Reports Server (NTRS)

    Verderaime, V.

    1979-01-01

    An analytical technique for implementing simultaneously the temperature, dynamic strain, real modulus, and frequency properties of solid propellant in an unsymmetrical vibrating ring mode is presented. All dynamic parameters and sources are defined for a free vibrating ring-grain structure with initial displacement and related to a forced vibrating system to determine the change in real modulus. Propellant test data application is discussed. The technique was developed to determine the aft attach ring stiffness of the shuttle booster at lift-off.

  8. STS-46 Commander Shriver eats candy (M and Ms) on OV-104's aft flight deck

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-46 Commander Loren J. Shriver, wearing a communications kit assembly headset and with his mouth open, pursues several floating chocolate-covered peanut candies (M and Ms) on the aft flight deck of Atlantis, Orbiter Vehicle (OV) 104. Shriver is positioned in front of overhead window W7. Outside the window the cloud-covered surface of the Earth and the Earth's limb are visible.

  9. STS-30 Pilot Grabe uses 35mm camera on aft flight deck

    NASA Technical Reports Server (NTRS)

    1989-01-01

    STS-30 Pilot Ronald J. Grabe, positioned at aft flight deck overhead window W7, holds 35mm camera before photographing Earth observation scene visible outside window. Appearing around Grabe are a pair of binoculars (freefloating in overhead window), overhead light fixture, onorbit station control panels, and a communications kit assembly headset interface unit (HIU) velcroed to onorbit station panel. Grabe is wearing mission polo shirt and light blue flight coverall pants.

  10. Compartment A123, ship's laundry view aft to forward. Large dial ...

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

    Compartment A-123, ship's laundry view aft to forward. Large dial at left center appears to be a timer for controlling washing machine at lower right. Low, round machine to the left of the washer is a centrifuge used for spin drying laundry. Laundry was not part of original equipment but was added in the refurbishment of 1899. (024) - USS Olympia, Penn's Landing, 211 South Columbus Boulevard, Philadelphia, Philadelphia County, PA

  11. The influence of head and body tilt on human fore-aft translation perception.

    PubMed

    Crane, Benjamin T

    2014-12-01

    The tilt-translation ambiguity occurs because acceleration due to translation cannot be differentiated from gravitational acceleration. Head tilt can occur independent of body tilt which further complicates the problem. The tilt-translation ambiguity is examined for fore-aft (surge) translation with head and/or body orientations that are tilted in pitch 10° forward or backward. Eleven human subjects (six female), mean age 40 years participated. Conditions included no tilt (NT), head and body tilt (HBT), head only tilt (HOT), and body only tilt (BOT). The fore-aft stimulus consisted of a 2 s (0.5 Hz) sine wave in acceleration which a maximum peak velocity of 10 cm/s. After each stimulus, the subject reported the direction of motion as forward or backward. Subsequent stimuli were adjusted to determine the point at which subjects were equally likely to report motion in either direction. During the HBT, responses were biased such that upward pitch caused a neutral stimulus to be more likely to be perceived as forward and downward pitch caused the stimulus to be more likely to be perceived as backward. The difference in the point of subjective equality based on the direction of tilt was 3.3 cm/s. During the BOT condition, the bias with respect to the direction of body tilt was in a similar direction with a difference in PSE 1.6 cm/s. During HOT and NT, there was no significant bias on fore-aft perception. These findings demonstrate that body tilt shifts the PSE of fore-aft direction discrimination while head tilt has no influence.

  12. The influence of head and body tilt on human fore-aft translation perception

    PubMed Central

    Crane, Benjamin T.

    2016-01-01

    The tilt-translation ambiguity occurs because acceleration due to translation cannot be differentiated from gravitational acceleration. Head tilt can occur independent of body tilt which further complicates the problem. The tilt-translation ambiguity is examined for fore-aft (surge) translation with head and/or body orientations that are tilted in pitch 10° forward or backward. Eleven human subjects (6 female), mean age 40 years participated. Conditions included no tilt (NT), head and body tilt (HBT), head only tilt (HOT), and body only tilt (BOT). The fore-aft stimulus consisted of a 2s (0.5 Hz) sine wave in acceleration which a maximum peak velocity of 10 cm/s. After each stimulus the subject reported the direction of motion as forward or backward. Subsequent stimuli were adjusted to determine the point at which subjects were equally likely to report motion in either direction. During the HBT responses were biased such that upward pitch caused a neutral stimulus to be more likely to be perceived as forward and downward pitch caused the stimulus to be more likely to be perceived as backward. The difference in the point of subjective equality based on the direction of tilt was 3.3 cm/s. During the BOT condition the bias with respect to the direction of body tilt was in a similar direction with a difference in PSE 1.6 cm/s. During HOT and NT there was no significant bias on fore-aft perception. These findings demonstrate that body tilt shifts the PSE of fore-aft direction discrimination while head tilt has no influence. PMID:25160866

  13. On the Space Shuttle Endeavour's aft flight deck, astronaut Mario Runco, Jr., mission specialist,

    NASA Technical Reports Server (NTRS)

    1996-01-01

    STS-77 ESC VIEW --- On the Space Shuttle Endeavour's aft flight deck, astronaut Mario Runco, Jr., mission specialist, grabs a hand-held 70mm camera and prepares to take still pictures of an Earth observation target of opportunity. A pair of windows just out of frame above Runco's head provide the crew members with a prime operating perspective of Earth observation targets. A crew mate exposed the image with an Electronic Still Camera (ESC).

  14. STS-30 aft flight deck onboard view of overhead window, Earth limb, cow photo

    NASA Technical Reports Server (NTRS)

    1989-01-01

    Since the beginning of manned space travel, astronauts have taken onboard with them items of person sentiment. During STS-30 onboard Atlantis, Orbiter Vehicle (OV) 104, Mission Specialist Mark C. Lee brought along a photograph of a cow. The photo testifies to his background as one reared on a Wisconsin farm and is displayed on aft flight deck alongside an overhead window. Outside the window, some 160 nautical miles away, is the cloud-covered Earth surface.

  15. STS-27 MS Mullane on aft flight deck with camera equipment

    NASA Technical Reports Server (NTRS)

    1988-01-01

    STS-27 Mission Specialist (MS) Richard M. Mullane is surrounded by cameras and Earth observation equipment on the aft flight deck. In the frame are the ARRIFLEX 16mm motion picture camera, a 70mm still camera, a 35mm still camera, a pair of glasses, and a pair of binoculars. Clouds over an ocean can be seen out overhead window W8 above Mullane. Panel A3 closed circuit television (CCTV) screens are visible behind Mullane.

  16. STS-46 Payload Specialist Malerba at aft flight deck controls in JSC mockup

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-46 Atlantis, Orbiter Vehicle (OV) 104, Italian Payload Specialist Franco Malerba, wearing flight suit, operates controls on the aft flight deck of the Full Fuselage Trainer (FFT) located in JSC's Mockup and Integration Laboratory (MAIL) Bldg 9. During the training session, Malerba adjusts a control on the A3 panel closed circuit television (CCTV). Onorbit station panels appear in front of Malerba and payload station controls behind him.

  17. STS-26 Pilot Covey looks up at window W7 on shuttle mockup aft flight deck

    NASA Technical Reports Server (NTRS)

    1988-01-01

    STS-26 Discovery, Orbiter Vehicle (OV) 103, Pilot Richard O. Covey, leaning on Onorbit Station control panel, looks up at overhead window W7 on shuttle mockup aft flight deck in the Shuttle Mockup and Integration Laboratory Bldg 9A. Covey's left hand is positioned on Onorbit Station control panel A7U remote manipulator system (RMS) rotation hand control (RHC). Photograph was taken by Keith Meyers of the NEW YORK TIMES.

  18. Using probabilistic analysis to assess the reliability of predicted SRB aft-skirt stresses

    NASA Technical Reports Server (NTRS)

    Richardson, James A.

    1991-01-01

    Probabilistic failure analysis is a tool to predict the reliability of a part or system. Probabalistic techniques were used to predict critical stresses which occur in the solid rocket booster aft-skirt during main engine buildup, immediately prior to lift-off. More than any other hold down post (HDP) load component, the Z loads are sensitive to variations in strains and calibration constants. Also, predicted aft-skirt stresses are strongly affected by HDP load variations. Therefore, the instrumented HDP are not effective load transducers for Z loads, and, when used with aft skirt stress indicator equations, yield estimates with large uncertainty. Monte Carlo simulation proved to be a straight forward way of studying the overlapping effects of multiple parameters on predicted equipment performance. An advantage of probabilistic analysis is the degree of uncertainty of each parameter as stated explicitly by its probability distribution. It was noted, however, that the choice of parameter distribution had a large effect on the simulation results. Many times these distributions must be assumed. The engineer who is designing the part should be responsible for the choice of parameter distribution.

  19. Modeling of space shuttle SRB aft ends for inherent aerodynamic bias determination

    NASA Astrophysics Data System (ADS)

    González, David R.; Stapf, Sean P.; Gebhard, Thomas J.

    2007-04-01

    The Air Force's 45th Space Wing is in charge of operating the Range Safety System (RSS) for all launches that take place on the Eastern Range. If initiated, the RSS currently implemented on the Space Transportation System after launch would provide for the partial destruction of the solid rocket boosters (SRBs) to terminate thrust. The majority of the risk from the large explosive debris created comes from the aft ends of the SRBs, which fall largely intact along with the remaining propellant. Historically, no impact data on such a scenario has been available and in support of the Space Shuttle Return-to-Flight schedule, aerodynamic and trajectory analyses were performed to characterize any pitch angle biases associated with the aft end's descent after initiating the linear shaped charges (LSCs) on the SRBs. Results show the aft end has a bias towards impacting at +/-5, 70, or 175 degrees and takes an average of 10 seconds to stabilize into any one of these orientations after being separated from the SRB forward body.

  20. Adaptive Aft Signature Shaping of a Low-Boom Supersonic Aircraft Using Off-Body Pressures

    NASA Technical Reports Server (NTRS)

    Ordaz, Irian; Li, Wu

    2012-01-01

    The design and optimization of a low-boom supersonic aircraft using the state-of-the- art o -body aerodynamics and sonic boom analysis has long been a challenging problem. The focus of this paper is to demonstrate an e ective geometry parameterization scheme and a numerical optimization approach for the aft shaping of a low-boom supersonic aircraft using o -body pressure calculations. A gradient-based numerical optimization algorithm that models the objective and constraints as response surface equations is used to drive the aft ground signature toward a ramp shape. The design objective is the minimization of the variation between the ground signature and the target signature subject to several geometric and signature constraints. The target signature is computed by using a least-squares regression of the aft portion of the ground signature. The parameterization and the deformation of the geometry is performed with a NASA in- house shaping tool. The optimization algorithm uses the shaping tool to drive the geometric deformation of a horizontal tail with a parameterization scheme that consists of seven camber design variables and an additional design variable that describes the spanwise location of the midspan section. The demonstration cases show that numerical optimization using the state-of-the-art o -body aerodynamic calculations is not only feasible and repeatable but also allows the exploration of complex design spaces for which a knowledge-based design method becomes less effective.

  1. SRM attrition rate study of the aft motor case segments due to water impact cavity collapse loading

    NASA Technical Reports Server (NTRS)

    Crockett, C. D.

    1976-01-01

    The attrition assessment of the aft segments of Solid Rocket Motor due to water impact requires the establishment of a correlation between loading occurrences and structural capability. Each discrete load case, as identified by the water impact velocities and angle, varies longitudinally and radially in magnitude and distribution of the external pressure. The distributions are further required to be shifted forward or aft one-fourth the vehicle diameter to assure minimization of the effect of test instrumentation location for the load determinations. The asymmetrical load distributions result in large geometric nonlinearities in structural response. The critical structural response is progressive buckling of the case. Discrete stiffeners have been added to these aft segments to aid in gaining maximum structural capability for minimum weight addition for resisting these loads. This report presents the development of the attrition assessment of the aft segments and includes the rationale for eliminating all assessable conservatisms from this assessment.

  2. Ejecta evolution during cone impact

    NASA Astrophysics Data System (ADS)

    Marston, Jeremy; Vakarelski, Ivan; Thoroddsen, Sigurdur

    2013-11-01

    We present results from an experimental study of the impact of conical shaped bodies into a pool of liquid. By varying the cone angle, impact speed and liquid physical properties, we examine a broad parameter space and seek to find conditions when self-similarity can be observed during this phenomena. We use high-speed imaging to capture the early-time motion of the liquid ejecta which emanates from the tip of the cone and travels up along the cone surface. Surprisingly, we find that the detachment of the ejecta can be simply described by air entrainment relationships derived from coating experiments.

  3. Transonic Flow Past Cone Cylinders

    NASA Technical Reports Server (NTRS)

    Solomon, George E

    1955-01-01

    Experimental results are presented for transonic flow post cone-cylinder, axially symmetric bodies. The drag coefficient and surface Mach number are studied as the free-stream Mach number is varied and, wherever possible, the experimental results are compared with theoretical predictions. Interferometric results for several typical flow configurations are shown and an example of shock-free supersonic-to-subsonic compression is experimentally demonstrated. The theoretical problem of transonic flow past finite cones is discussed briefly and an approximate solution of the axially symmetric transonic equations, valid for a semi-infinite cone, is presented.

  4. Non-Invasive Detection of CH-46 AFT Gearbox Faults Using Digital Pattern Recognition and Classification Techniques

    DTIC Science & Technology

    2007-11-02

    A TRIDENT SCHOLAR PROJECT REPORT NO. 266 NON-INVASIVE DETECTION OF CH-46 AFT GEARBOX FAULTS USING DIGITAL PATTERN RECOGNITION AND CLASSIFICATION...NUMBERS Non-invasive detection of CH-46 AFT gearbox faults using digital pattern recognition and classification techniques 6. AUTHOR(S) Rex, Bryan D...helicopter gearboxes in order to d~iagnose end correct possible fault condi.itons (incipient faults ) which could eventually lead to gearbox failure. This

  5. Embryonic markers of cone differentiation

    PubMed Central

    Rodgers, Helen M.; Belcastro, Marycharmain; Sokolov, Maxim

    2016-01-01

    Purpose Photoreceptor cells are born in two distinct phases of vertebrate retinogenesis. In the mouse retina, cones are born primarily during embryogenesis, while rod formation occurs later in embryogenesis and early postnatal ages. Despite this dichotomy in photoreceptor birthdates, the visual pigments and phototransduction machinery are not reactive to visual stimulus in either type of photoreceptor cell until the second postnatal week. Several markers of early cone formation have been identified, including Otx2, Crx, Blimp1, NeuroD, Trβ2, Rorβ, and Rxrγ, and all are thought to be involved in cellular determination. However, little is known about the expression of proteins involved in cone visual transduction during early retinogenesis. Therefore, we sought to characterize visual transduction proteins that are expressed specifically in photoreceptors during mouse embryogenesis. Methods Eye tissue was collected from control and phosducin-null mice at embryonic and early postnatal ages. Immunohistochemistry and quantitative reverse transcriptase-PCR (qPCR) were used to measure the spatial and temporal expression patterns of phosducin (Pdc) and cone transducin γ (Gngt2) proteins and transcripts in the embryonic and early postnatal mouse retina. Results We identified the embryonic expression of phosducin (Pdc) and cone transducin γ (Gngt2) that coincides temporally and spatially with the earliest stages of cone histogenesis. Using immunohistochemistry, the phosducin protein was first detected in the retina at embryonic day (E)12.5, and cone transducin γ was observed at E13.5. The phosducin and cone transducin γ proteins were seen only in the outer neuroblastic layer, consistent with their expression in photoreceptors. At the embryonic ages, phosducin was coexpressed with Rxrγ, a known cone marker, and with Otx2, a marker of photoreceptors. Pdc and Gngt2 mRNAs were detected as early as E10.5 with qPCR, although at low levels. Conclusions Visual transduction

  6. Visual Pigments of Goldfish Cones

    PubMed Central

    Hárosi, Ferenc I.; MacNichol, Edward F.

    1974-01-01

    Freshly isolated retinal photoreceptors of goldfish were studied microspectrophotometrically. Absolute absorptance spectra obtained from dark-adapted cone outer segments reaffirm the existence of three spectrally distinct cone types with absorption maxima at 455 ± 3,530 ± 3, and 625 ± 5 nm. These types were found often recognizable by gross cellular morphology. Side-illuminated cone outer segments were dichroic. The measured dichroic ratio for the main absorption band of each type was 2–3:1. Rapidly bleached cells revealed spectral and dichroic transitions in regions near 400–410, 435–455, and 350–360 nm. These photoproducts decay about fivefold as fast as the intermediates in frog rods. The spectral maxima of photoproducts, combined with other evidence, indicate that retinene2 is the chromophore of all three cone pigments. The average specific optical density for goldfish cone outer segments was found to be 0.0124 ± 0.0015/µm. The spectra of the blue-, and green-absorbing cones appeared to match porphyropsin standards with half-band width Δν = 4,832 ± 100 cm–1. The red-absorbing spectrum was found narrower, having Δν = 3,625 ± 100 cm–1. The results are consistent with the notion that visual pigment concentration within the outer segments is about the same for frog rods and goldfish cones, but that the blue-, and green-absorbing pigments possess molar extinctions of 30,000 liter/mol cm. The red-absorbing pigment was found to have extinction of 40,000 liter/mol cm, assuming invariance of oscillator strength among the three cone spectra. PMID:4817352

  7. Tertiary interactions within the ribosomal exit tunnel.

    PubMed

    Kosolapov, Andrey; Deutsch, Carol

    2009-04-01

    Although tertiary folding of whole protein domains is prohibited by the cramped dimensions of the ribosomal tunnel, dynamic tertiary interactions may permit folding of small elementary units within the tunnel. To probe this possibility, we used a beta-hairpin and an alpha-helical hairpin from the cytosolic N terminus of a voltage-gated potassium channel and determined a probability of folding for each at defined locations inside and outside the tunnel. Minimalist tertiary structures can form near the exit port of the tunnel, a region that provides an entropic window for initial exploration of local peptide conformations. Tertiary subdomains of the nascent peptide fold sequentially, but not independently, during translation. These studies offer an approach for diagnosing the molecular basis for folding defects that lead to protein malfunction and provide insight into the role of the ribosome during early potassium channel biogenesis.

  8. 19 CFR 18.22 - Procedure at port of exit.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 19 Customs Duties 1 2013-04-01 2013-04-01 false Procedure at port of exit. 18.22 Section 18.22... to Foreign Countries § 18.22 Procedure at port of exit. (a) If transfer is necessary, the procedure shall be as prescribed in § 18.3(d). (b) Upon the arrival at the port of exit of express shipments...

  9. 19 CFR 18.22 - Procedure at port of exit.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 19 Customs Duties 1 2010-04-01 2010-04-01 false Procedure at port of exit. 18.22 Section 18.22... to Foreign Countries § 18.22 Procedure at port of exit. (a) If transfer is necessary, the procedure shall be as prescribed in § 18.3(d). (b) Upon the arrival at the port of exit of express shipments...

  10. 19 CFR 18.22 - Procedure at port of exit.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 19 Customs Duties 1 2011-04-01 2011-04-01 false Procedure at port of exit. 18.22 Section 18.22... to Foreign Countries § 18.22 Procedure at port of exit. (a) If transfer is necessary, the procedure shall be as prescribed in § 18.3(d). (b) Upon the arrival at the port of exit of express shipments...

  11. 19 CFR 18.22 - Procedure at port of exit.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 19 Customs Duties 1 2014-04-01 2014-04-01 false Procedure at port of exit. 18.22 Section 18.22... to Foreign Countries § 18.22 Procedure at port of exit. (a) If transfer is necessary, the procedure shall be as prescribed in § 18.3(d). (b) Upon the arrival at the port of exit of express shipments...

  12. 19 CFR 18.22 - Procedure at port of exit.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 19 Customs Duties 1 2012-04-01 2012-04-01 false Procedure at port of exit. 18.22 Section 18.22... to Foreign Countries § 18.22 Procedure at port of exit. (a) If transfer is necessary, the procedure shall be as prescribed in § 18.3(d). (b) Upon the arrival at the port of exit of express shipments...

  13. Aft2, a Novel Transcription Regulator, Is Required for Iron Metabolism, Oxidative Stress, Surface Adhesion and Hyphal Development in Candida albicans

    PubMed Central

    Xu, Ning; Cheng, Xinxin; Yu, Qilin; Qian, Kefan; Ding, Xiaohui; Liu, Ruming; Zhang, Biao; Xing, Laijun; Li, Mingchun

    2013-01-01

    Morphological transition and iron metabolism are closely relevant to Candida albicans pathogenicity and virulence. In our previous study, we demonstrated that C. albicans Aft2 plays an important role in ferric reductase activity and virulence. Here, we further explored the roles of C. albicans Aft2 in numerous cellular processes. We found that C. albicans Aft2 exhibited an important role in iron metabolism through bi-directional regulation effects on iron-regulon expression. Deletion of AFT2 reduced cellular iron accumulation under iron-deficient conditions. Furthermore, both reactive oxygen species (ROS) generation and superoxide dismutase (SOD) activity were remarkably increased in the aft2Δ/Δ mutant, which were thought to be responsible for the defective responses to oxidative stress. However, we found that over-expression of C. albicans AFT2 under the regulation of the strong PGK1 promoter could not effectively rescue Saccharomyces cerevisiae aft1Δ mutant defects in some cellular processes, such as cell-wall assembly, ion homeostasis and alkaline resistance, suggesting a possibility that C. albicans Aft2 weakened its functional role of regulating some cellular metabolism during the evolutionary process. Interestingly, deletion of AFT2 in C. albicans increased cell surface hydrophobicity, cell flocculation and the ability of adhesion to polystyrene surfaces. In addition, our results also revealed that C. albicans Aft2 played a dual role in regulating hypha-specific genes under solid and liquid hyphal inducing conditions. Deletion of AFT2 caused an impaired invasive growth in solid medium, but an increased filamentous aggregation and growth in liquid conditions. Moreover, iron deficiency and environmental cues induced nuclear import of Aft2, providing additional evidence for the roles of Aft2 in transcriptional regulation. PMID:23626810

  14. STS-65 Pilot Halsell cleans window on the aft flight deck of Columbia, OV-102

    NASA Technical Reports Server (NTRS)

    1994-01-01

    On the aft flight deck of Columbia, Orbiter Vehicle (OV) 102, STS-65 Pilot James D. Halsell, Jr cleans off overhead window W8. Mission Specialist (MS) Carl E. Walz looks on (photo's edge). A plastic toy dinosaur, velcroed in front of W9, also appears to be watching the housekeeping activity. A variety of onboard equipment including procedural checklists, a spotmeter, a handheld microphone, and charts are seen in the view. The two shared over fourteen days in Earth orbit with four other NASA astronauts and a Japanese payload specialist in support of the second International Microgravity Laboratory (IML-2) mission.

  15. STS-35 Columbia, OV-102, aft fuselage LRU hydrogen recirculation pump

    NASA Technical Reports Server (NTRS)

    1990-01-01

    Closeup view shows the aft fuselage line replaceable unit (LRU) hydrogen recirculation pump from Columbia, Orbiter Vehicle (OV) 102. The pump is being tested at JSC's Thermochemical Test Area (TTA) Support Laboratory Bldg 350. JSC technicians ran the pump package through the battery of leak tests. Preliminary indications showed only minor, acceptable leakage from the package and Kennedy Space Center (KSC) technicians have replaced a crushed seal on the prevalve of the main propulsion system they believe may have caused the STS-35 hydrogen leak.

  16. Portion of left hand SRB aft segment containing ET attach ring for 51-L

    NASA Technical Reports Server (NTRS)

    1986-01-01

    These two photographs show a portion of the left hand solid rocket booster (SRB) aft segment which contains the external tank (ET) attach ring for the 51-L mission resting on the ocean bottom in 210 feet of water approximately 23 miles east of the Kennedy Space Center (KSC). The photographs were take by the Deep Drone, a remotely controlled, unmanned U.S. Navy submersible. Photo 1 shows small fish below and to the left of the booster segment (10145); Photo two shows the opposite end of the segment. Visible from left are the clevis portion of the field joint and the external tank attach ring (10146).

  17. STS-45 MS and PLC Sullivan explains camera usage on OV-104's aft flight deck

    NASA Technical Reports Server (NTRS)

    1992-01-01

    STS-45 Mission Specialist (MS) and Payload Commander (PLC) Kathryn D. Sullivan, holding communications kit assembly unit and 70mm HASSELBLAD camera, explains camera usage and Earth observation procedures during a television downlink to the ground. Sullivan is on the aft flight deck of Atlantis, Orbiter Vehicle (OV) 104. Behind Sullivan are the onorbit station control panels with the payload station control panels at her left. The STS-45 crew put together a brief video 'tour' program to explain some of their inflight operations.

  18. Aft Engine shop worker removes a heat shield on Columbia's main engines

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. - Doug Buford, with the Aft Engine shop, works at removing a heat shield on Columbia, in the Orbiter Processing Facility. After small cracks were discovered on the LH2 Main Propulsion System (MPS) flow liners in two other orbiters, program managers decided to move forward with inspections on Columbia before clearing it for flight on STS-107. After removal of the heat shields, the three main engines will be removed. Inspections of the flow liners will follow. The July 19 launch of Columbia on STS-107 has been delayed a few weeks

  19. Aft Engine shop worker removes a heat shield on Columbia's main engines

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- Doug Buford, with the Aft Engine shop, works at removing a heat shield on Columbia, in the Orbiter Processing Facility. After small cracks were discovered on the LH2 Main Propulsion System (MPS) flow liners in two other orbiters, program managers decided to move forward with inspections on Columbia before clearing it for flight on STS-107. After removal of the heat shields, the three main engines will be removed. Inspections of the flow liners will follow. The July 19 launch of Columbia on STS-107 has been delayed a few weeks

  20. Aft Engine shop worker removes a heat shield on Columbia's main engines

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- Doug Buford (top), with the Aft Engine shop, along with another worker, removes a heat shield on one of Columbia's engines. After small cracks were discovered on the LH2 Main Propulsion System (MPS) flow liners in two other orbiters, program managers decided to move forward with inspections on Columbia before clearing it for flight on STS-107. After removal of the heat shields, the three main engines will be removed. Inspections of the flow liners will follow. The July 19 launch of Columbia on STS-107 has been delayed a few weeks

  1. STS-26 MS Nelson operates controls for PVTOS-2 experiment on aft middeck

    NASA Technical Reports Server (NTRS)

    1988-01-01

    STS-26 Mission Specialist (MS) George D. Nelson operates generic electronics module for the Physical Vapor Transport of Organic Solids 2 (PVTOS-2) experiment on Discovery's, Orbiter Vehicle (OV) 103's, aft middeck. PVTOS-2 consists of nine independent experimental cells about 12 inches long and 3 inches in diameter. They are mounted in a circular base plate inside the drum-like experimental apparatus container (EAC). PVTOS-2 is sponsored by NASA's Office of Commercial Programs and is being conducted by 3M's Space Research and Applications Laboratory.

  2. Crystal structures of Boro-AFm and sBoro-AFt phases

    SciTech Connect

    Champenois, Jean-Baptiste; Cau Dit Coumes, Celine; Leroux, Fabrice; Mercier, Cyrille; Revel, Bertrand; Damidot, Denis

    2012-10-15

    Crystal structures of boron-containing AFm (B-AFm) and AFt (B-AFt) phases have been solved ab-initio and refined from X-ray powder diffraction. {sup 11}B NMR and Raman spectroscopies confirm the boron local environment in both compounds: three-fold coordinated in B-AFm corresponding to HBO{sub 3}{sup 2-} species, and four-fold coordinated in B-AFt corresponding to B (OH){sub 4}{sup -} species. B-AFm crystallizes in the rhombohedral R3{sup Macron }c space group and has the 3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}CaHBO{sub 3}{center_dot}12H{sub 2}O (4CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}1/2B{sub 2}O{sub 3}{center_dot}12.5H{sub 2}O, C{sub 4}AB{sub 1/2}H{sub 12.5}) general formulae with planar trigonal HBO{sub 3}{sup 2-} anions weakly bonded at the centre of the interlayer region. One HBO{sub 3}{sup 2-} anion is statistically distributed with two weakly bonded water molecules on the same crystallographic site. B-AFt crystallizes in the trigonal P3cl space group and has the 3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}Ca(OH){sub 2}{center_dot}2Ca(B (OH){sub 4}){sub 2}{center_dot}24H{sub 2}O (6CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}2B{sub 2}O{sub 3}{center_dot}33H{sub 2}O, C{sub 6}AB{sub 2}H{sub 33}) general formulae with tetrahedral B (OH){sub 4}{sup -} anions located in the channel region of the structure. All tetrahedral anions are oriented in a unique direction, leading to a hexagonal c lattice parameter about half that of ettringite.

  3. Assessing Undergraduate Curriculum Through Student Exit Vectors

    NASA Astrophysics Data System (ADS)

    Keane, C. M.; Gonzales, L.; Martinez, C.

    2008-12-01

    One aspect of assessing the undergraduate curriculum is recognizing that the exit vector of the student is a metric in the absence of a structured assessment program. Detailed knowledge across all geosciences departments regarding the disposition of their recent baccalaureate recipients has been at best inconsistent, and in the case of about half of geoscience programs, non-existent. However, through examining of multiple datasets, a pattern of disposition of geosciences BS recipients emerges, providing a snapshot of the system- wide response to the system-wide "average" program. This pattern can also be juxtaposed against several frameworks of desired skill sets for recent graduates and the employment sectors likely to hire them. The question remains is can one deduce the effectiveness of the undergraduate program in placing graduates in their next step, whether in graduate school or the workplace. Likewise, with an increasing scrutiny on the "value" of an education, is the resulting economic gain sufficient for the student, such that programs will be viewed as sustainable. A factor in answering this question is the importance of the undergraduate program in the ultimate destination of the professional. Clear pathways exist for "optimal" schools for the production of new faculty and new industry professionals, but is it possible to identify those trends further up the educational pipeline? One major mechanism to examine the undergraduate program effectiveness related to exit vectors is to look at hiring trends witnessed related to markedly different program structures, such as those at universities outside of the United States. Rectifying academic programs between the United States and other national systems is often a challenge, but even given the substantial differences between depth of technical knowledge and breadth of education across these programs, in the end, the sum product is often viewed as roughly comparable. This paper will look at end

  4. Jet Nozzle Having Centerbody for Enhanced Exit Area Mixing

    NASA Technical Reports Server (NTRS)

    Seiner, John M. (Inventor); Gilinsky, Mikhail M. (Inventor)

    1999-01-01

    A nozzle arrangement includes a nozzle and a centerbody. The longitudinal axis of the centerbody is coaxially aligned with the nozzle. The centerbody has a free end portion shaped to create vortices in exhaust exiting the exit area. The vortices enhance mixing action in the exhaust and reduce exhaust noise while augmenting thrust.

  5. Exit Surveying of Interns: Demonstrating Impact on Young Professionals

    ERIC Educational Resources Information Center

    Muscio, Cara

    2011-01-01

    Documenting impact is becoming increasingly important as funding becomes tighter for Extension programs. An exit survey for interns conducted via an online survey tool is an opportunity to collect information on knowledge and skill gains, as well as document changes in intentions and attitudes about future career paths. An exit survey conducted…

  6. Open Entry/Open Exit Study. Final Report.

    ERIC Educational Resources Information Center

    Berg, Marvin

    Open entry/open exit refers to formats and procedures which allow learners to enter a program whenever they are ready and available, and allows them to leave or complete programs when competencies for job entry are attained. This study sought to provide base data on the concept of open entry/open exit by surveying involved individuals and to…

  7. The GED Exit Option Model. Procedure Manual. Revised.

    ERIC Educational Resources Information Center

    Florida State Dept. of Education, Tallahassee. Bureau of Instructional Support and Community Services.

    The purpose of this document is to assist Florida school districts in implementing the General Educational Development (GED) Exit Option Model for students at risk of not completing high school. Students must be at least 16 years of age and currently enrolled in high school to take the GED tests through the GED Exit Option Model. In addition, the…

  8. Towards an Orderly Exit Regime in English Higher Education

    ERIC Educational Resources Information Center

    Fisher, Andrew

    2016-01-01

    In a competitive market, the exit of those suppliers who cannot offer an attractive product at an attractive price is seen as desirable. However, the consequences for consumers when their own supplier leaves the market in an unplanned or disorderly way may be undesirable. Exit regimes exist in regulated markets to ensure that consumers are not…

  9. Exit Exams Face Pinch in Common-Core Push

    ERIC Educational Resources Information Center

    Ujifusa, Andrew

    2012-01-01

    With many states crafting assessments based on the common-core standards--and an increasing emphasis on college and career readiness--some are rethinking the kind of tests high school students must pass to graduate, or whether to use such exit exams at all. Twenty-five states, enrolling a total of 34.1 million students, make exit exams a…

  10. 14 CFR 25.811 - Emergency exit marking.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... wide and a head twice the width of the shaft, extending along at least 70 degrees of arc at a radius... Emergency exit marking. (a) Each passenger emergency exit, its means of access, and its means of opening... recognizable from a distance equal to the width of the cabin. (c) Means must be provided to assist...

  11. ETR WASTE GAS EXITED THE ETR COMPLEX FROM THE NORTH ...

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

    ETR WASTE GAS EXITED THE ETR COMPLEX FROM THE NORTH SIDE THROUGH A TUNNEL AND THEN TO A FILTER PIT. TUNNEL EXIT IS UNDER CONSTRUCTION WHILE CONTROL BUILDING IS BEING FORMED BEYOND. CAMERA FACING WEST. INL NEGATIVE NO. 56-1238. Jack L. Anderson, Photographer, 4/17/1956 - Idaho National Engineering Laboratory, Test Reactor Area, Materials & Engineering Test Reactors, Scoville, Butte County, ID

  12. 45 CFR 670.34 - Entry and exit ports.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 45 Public Welfare 3 2013-10-01 2013-10-01 false Entry and exit ports. 670.34 Section 670.34 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION CONSERVATION OF ANTARCTIC ANIMALS AND PLANTS Import Into and Export From the United States § 670.34 Entry and exit ports....

  13. 45 CFR 670.34 - Entry and exit ports.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 45 Public Welfare 3 2011-10-01 2011-10-01 false Entry and exit ports. 670.34 Section 670.34 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION CONSERVATION OF ANTARCTIC ANIMALS AND PLANTS Import Into and Export From the United States § 670.34 Entry and exit ports....

  14. 45 CFR 670.34 - Entry and exit ports.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 45 Public Welfare 3 2012-10-01 2012-10-01 false Entry and exit ports. 670.34 Section 670.34 Public Welfare Regulations Relating to Public Welfare (Continued) NATIONAL SCIENCE FOUNDATION CONSERVATION OF ANTARCTIC ANIMALS AND PLANTS Import Into and Export From the United States § 670.34 Entry and exit ports....

  15. Exit and Voice: Organizational Loyalty and Dispute Resolution Strategies

    ERIC Educational Resources Information Center

    Hoffmann, Elizabeth A.

    2006-01-01

    This study compares workplace dispute resolution strategies (exit, voice and toleration) in matched pairs of conventional and worker-owned cooperative organizations operating in three industries--coal mining, taxicab driving and organic food distribution. Building on Hirschman's classic exit, voice and loyalty thesis, this research demonstrates…

  16. 8 CFR 215.9 - Temporary Worker Visa Exit Program.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 8 Aliens and Nationality 1 2012-01-01 2012-01-01 false Temporary Worker Visa Exit Program. 215.9 Section 215.9 Aliens and Nationality DEPARTMENT OF HOMELAND SECURITY IMMIGRATION REGULATIONS CONTROLS OF ALIENS DEPARTING FROM THE UNITED STATES § 215.9 Temporary Worker Visa Exit Program. An alien admitted...

  17. 8 CFR 215.9 - Temporary Worker Visa Exit Program.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 8 Aliens and Nationality 1 2014-01-01 2014-01-01 false Temporary Worker Visa Exit Program. 215.9 Section 215.9 Aliens and Nationality DEPARTMENT OF HOMELAND SECURITY IMMIGRATION REGULATIONS CONTROLS OF ALIENS DEPARTING FROM THE UNITED STATES § 215.9 Temporary Worker Visa Exit Program. An alien admitted...

  18. 8 CFR 215.9 - Temporary Worker Visa Exit Program.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 8 Aliens and Nationality 1 2010-01-01 2010-01-01 false Temporary Worker Visa Exit Program. 215.9 Section 215.9 Aliens and Nationality DEPARTMENT OF HOMELAND SECURITY IMMIGRATION REGULATIONS CONTROLS OF ALIENS DEPARTING FROM THE UNITED STATES § 215.9 Temporary Worker Visa Exit Program. An alien admitted...

  19. 8 CFR 215.9 - Temporary Worker Visa Exit Program.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 8 Aliens and Nationality 1 2013-01-01 2013-01-01 false Temporary Worker Visa Exit Program. 215.9 Section 215.9 Aliens and Nationality DEPARTMENT OF HOMELAND SECURITY IMMIGRATION REGULATIONS CONTROLS OF ALIENS DEPARTING FROM THE UNITED STATES § 215.9 Temporary Worker Visa Exit Program. An alien admitted...

  20. 8 CFR 215.9 - Temporary Worker Visa Exit Program.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 8 Aliens and Nationality 1 2011-01-01 2011-01-01 false Temporary Worker Visa Exit Program. 215.9 Section 215.9 Aliens and Nationality DEPARTMENT OF HOMELAND SECURITY IMMIGRATION REGULATIONS CONTROLS OF ALIENS DEPARTING FROM THE UNITED STATES § 215.9 Temporary Worker Visa Exit Program. An alien admitted...

  1. 14 CFR 29.813 - Emergency exit access.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT Design and Construction Personnel and Cargo... aisle to each Type III and Type IV exit, and (1) For rotorcraft that have a passenger seating... that exit of not less than the width of the narrowest passenger seat installed on the rotorcraft;...

  2. Exiting and Returning to the Parental Home for Boomerang Kids

    PubMed Central

    Sandberg-Thoma, Sara E.; Snyder, Anastasia R.; Jang, Bohyun Joy

    2015-01-01

    Young adults commonly exit from and return to the parental home, yet few studies have examined the motivation behind these exits and returns using a life course framework. Using data from the National Longitudinal Survey of Youth 1997, the authors examined associations between mental health problems and economic characteristics and exits from (n = 8,162), and returns to (n = 6,530), the parental home during the transition to adulthood. The average age of the respondents was 24 years. The authors found evidence that mental health and economic characteristics were related to home leaving and returning. Emotional distress was associated with earlier exits from, and returns to, the parental home; alcohol problems were associated with earlier returns to the parental home. The findings regarding economic resources were unexpectedly mixed. Greater economic resources were linked to delayed exits from, and earlier returns to, the parental home. The implications of these findings for young adults are discussed. PMID:26023244

  3. Mean-field theory for pedestrian outflow through an exit

    NASA Astrophysics Data System (ADS)

    Yanagisawa, Daichi; Nishinari, Katsuhiro

    2007-12-01

    The average pedestrian flow through an exit is one of the most important indices in evaluating pedestrian dynamics. In order to study the flow in detail, the floor field model, which is a crowd model using cellular automata, is extended by taking into account realistic behavior of pedestrians around the exit. The model is studied by both numerical simulations and cluster analysis to obtain a theoretical expression for the average pedestrian flow through the exit. It is found quantitatively that the effects of exit door width, the wall, and the pedestrian mood of competition or cooperation significantly influence the average flow. The results show that there is a suitable width and position of the exit according to the pedestrians’ mood.

  4. Disruption of Mycobacterial AftB Results in Complete Loss of Terminal β(1 → 2) Arabinofuranose Residues of Lipoarabinomannan

    PubMed Central

    2016-01-01

    Lipoarabinomannan (LAM) and arabinogalactan (AG) are the two major mycobacterial cell wall (lipo)polysaccharides, which contain a structurally similar arabinan domain that is highly branched and assembled in a stepwise fashion by variety of arabinofuranosyltransferases (ArafT). In addition to playing an essential role in mycobacterial physiology, LAM and its biochemical precursor lipomannan possess potent immunomodulatory activities that affect the host immune response. In the search of additional mycobacterial ArafTs that participate in the synthesis of the arabinan segment of LAM, we disrupted aftB (MSMEG_6400) in Mycobacterium smegmatis. The deletion of chromosomal aftB locus could only be achieved in the presence of a rescue plasmid carrying a functional copy of aftB, strongly suggesting that it is essential for the viability of M. smegmatis. Isolation and detailed structural characterization of a LAM molecule derived from the conditional mutant deficient in AftB revealed the absence of terminal β(1 → 2)-linked arabinofuranosyl residues. Furthermore, we demonstrated that truncated LAM displays proinflammatory activity, which is due to its ability to activate Toll-like receptor 2. All together, our results indicate that AftB is an essential mycobacterial ArafT that plays a role in the synthesis of the arabinan domain of LAM. PMID:28033704

  5. Shatter cones: (Mis)understood?

    PubMed Central

    Osinski, Gordon R.; Ferrière, Ludovic

    2016-01-01

    Meteorite impact craters are one of the most common geological features in the solar system. An impact event is a near-instantaneous process that releases a huge amount of energy over a very small region on a planetary surface. This results in characteristic changes in the target rocks, from vaporization and melting to solid-state effects, such as fracturing and shock metamorphism. Shatter cones are distinctive striated conical fractures that are considered unequivocal evidence of impact events. They are one of the most used and trusted shock-metamorphic effects for the recognition of meteorite impact structures. Despite this, there is still considerable debate regarding their formation. We show that shatter cones are present in several stratigraphic settings within and around impact structures. Together with the occurrence of complete and “double” cones, our observations are most consistent with shatter cone formation due to tensional stresses generated by scattering of the shock wave due to heterogeneities in the rock. On the basis of field mapping, we derive the relationship Dsc = 0.4 Da, where Dsc is the maximum spatial extent of in situ shatter cones, and Da is the apparent crater diameter. This provides an important, new, more accurate method to estimate the apparent diameter of eroded complex craters on Earth. We have reestimated the diameter of eight well-known impact craters as part of this study. Finally, we suggest that shatter cones may reduce the strength of the target, thus aiding crater collapse, and that their distribution in central uplifts also records the obliquity of impact. PMID:27532050

  6. Shatter cones: (Mis)understood?

    PubMed

    Osinski, Gordon R; Ferrière, Ludovic

    2016-08-01

    Meteorite impact craters are one of the most common geological features in the solar system. An impact event is a near-instantaneous process that releases a huge amount of energy over a very small region on a planetary surface. This results in characteristic changes in the target rocks, from vaporization and melting to solid-state effects, such as fracturing and shock metamorphism. Shatter cones are distinctive striated conical fractures that are considered unequivocal evidence of impact events. They are one of the most used and trusted shock-metamorphic effects for the recognition of meteorite impact structures. Despite this, there is still considerable debate regarding their formation. We show that shatter cones are present in several stratigraphic settings within and around impact structures. Together with the occurrence of complete and "double" cones, our observations are most consistent with shatter cone formation due to tensional stresses generated by scattering of the shock wave due to heterogeneities in the rock. On the basis of field mapping, we derive the relationship D sc = 0.4 D a, where D sc is the maximum spatial extent of in situ shatter cones, and D a is the apparent crater diameter. This provides an important, new, more accurate method to estimate the apparent diameter of eroded complex craters on Earth. We have reestimated the diameter of eight well-known impact craters as part of this study. Finally, we suggest that shatter cones may reduce the strength of the target, thus aiding crater collapse, and that their distribution in central uplifts also records the obliquity of impact.

  7. Differences in Student Achievement between Early-Exit and Late-Exit Bilingual Programs: A Multiyear, Statewide Investigation

    ERIC Educational Resources Information Center

    Martinez, Rosa Maria

    2014-01-01

    Purpose The purpose of this study was to examine the difference between two bilingual program types: traditional early-exit and late-exit bilingual programs and academic achievement using archival data from the Texas Education Agency Public Education Information Management System. An examination of academic achievement rates across a 3-year period…

  8. Evaluation of Two Methods of Prompting Drivers to Use Specific Exits on Conflicts between Vehicles at the Critical Exit

    ERIC Educational Resources Information Center

    Van Houten, Ron; Malenfant, J. E. Louis; Zhao, Nan; Ko, Byungkon; Van Houten, Jonathan

    2005-01-01

    The Florida Department of Transportation used a series of changeable-message signs that functioned as freeway guide signs to divert traffic to Universal Theme Park via one of two eastbound exits based on traffic congestion at the first of the two exits. An examination of crashes along the entire route indicated a statistically significant increase…

  9. Feeding of swimming Paramecium with fore-aft asymmetry in viscous fluid

    NASA Astrophysics Data System (ADS)

    Zhang, Peng; Jana, Saikat; Giarra, Matthew; Vlachos, Pavlos; Jung, Sunghwan

    2013-11-01

    Swimming behaviours and feeding efficiencies of Paramecium Multimicronucleatum with fore-aft asymmetric body shapes are studied experimentally and numerically. Among various possible swimming ways, ciliates typically exhibit only one preferred swimming directions in favorable conditions. Ciliates, like Paramecia, with fore-aft asymmetric shapes preferably swim towards the slender anterior while feeding fluid to the oral groove located at the center of the body. Since both feeding and swimming efficiencies are influenced by fluid motions around the body, it is important to reveal the fluid mechanics around a moving object. Experimentally, μ-PIV methods are employed to characterize the source-dipole streamline patterns and fluid motions around Paramecium. Numerical simulations by boundary element methods are also used to evaluate surface stresses and velocities, which give insights into the efficiencies of swimming and feeding depending on body asymmetry. It is concluded that a slender anterior and fat posterior increases the combined efficiency of swimming and feeding, which matches well with actual shapes of Paramecium. Discrepancies between experiments and simulations are also discussed.

  10. Aerodynamic Impact of an Aft-Facing Slat-Step on High Re Airfoils

    NASA Astrophysics Data System (ADS)

    Kibble, Geoffrey; Petrin, Chris; Jacob, Jamey; Elbing, Brian; Ireland, Peter; Black, Buddy

    2016-11-01

    Typically, the initial aerodynamic design and subsequent testing and simulation of an aircraft wing assumes an ideal wing surface without imperfections. In reality, however the surface of an in-service aircraft wing rarely matches the surface characteristics of the test wings used during the conceptual design phase and certification process. This disconnect is usually deemed negligible or overlooked entirely. Specifically, many aircraft incorporate a leading edge slat; however, the mating between the slat and the top surface of the wing is not perfectly flush and creates a small aft-facing step behind the slat. In some cases, the slat can create a step as large as one millimeter tall, which is entirely submerged within the boundary layer. This abrupt change in geometry creates a span-wise vortex behind the step and in transonic flow causes a shock to form near the leading edge. This study investigates both experimentally and computationally the implications of an aft-facing slat-step on an aircraft wing and is compared to the ideal wing surface for subsonic and transonic flow conditions. The results of this study are useful for design of flow control modifications for aircraft currently in service and important for improving the next generation of aircraft wings.

  11. Cone Penetrometer N Factor Determination Testing Results

    SciTech Connect

    Follett, Jordan R.

    2014-03-05

    This document contains the results of testing activities to determine the empirical 'N Factor' for the cone penetrometer in kaolin clay simulant. The N Factor is used to releate resistance measurements taken with the cone penetrometer to shear strength.

  12. Autogenic-Feedback Training (AFT) as a preventive method for space motion sickness: Background and experimental design

    NASA Technical Reports Server (NTRS)

    Cowings, Patricia S.; Toscano, William B.

    1993-01-01

    Finding an effective treatment for the motion sickness-like symptoms that occur in space has become a high priority for NASA. The background research is reviewed and the experimental design of a formal life sciences shuttle flight experiment designed to prevent space motion sickness in shuttle crew members is presented. This experiment utilizes a behavioral medicine approach to solving this problem. This method, Autogenic-Feedback Training (AFT), involves training subjects to voluntarily control several of their own physiological responses to environmental stressors. AFT has been used reliably to increase tolerance to motion sickness during ground-based tests in over 200 men and women under a variety of conditions that induce motion sickness, and preliminary evidence from space suggests that AFT may be an effective treatment for space motion sickness as well. Proposed changes to this experiment for future manifests are included.

  13. Finite Element Simulation of a Space Shuttle Solid Rocket Booster Aft Skirt Splashdown Using an Arbitrary Lagrangian-eulerian Approach

    NASA Technical Reports Server (NTRS)

    Melis, Matthew E.

    2003-01-01

    Explicit finite element techniques employing an Arbitrary Lagrangian-Eulerian (ALE) methodology, within the transient dynamic code LS-DYNA, are used to predict splashdown loads on a proposed replacement/upgrade of the hydrazine tanks on the thrust vector control system housed within the aft skirt of a Space Shuttle Solid Rocket Booster. Two preliminary studies are performed prior to the full aft skirt analysis: An analysis of the proposed tank impacting water without supporting aft skirt structure, and an analysis of space capsule water drop tests conducted at NASA's Langley Research Center. Results from the preliminary studies provide confidence that useful predictions can be made by applying the ALE methodology to a detailed analysis of a 26-degree section of the skirt with proposed tank attached. Results for all three studies are presented and compared to limited experimental data. The challenges of using the LS-DYNA ALE capability for this type of analysis are discussed.

  14. STS-43 TDRS-E / IUS in OV-104's PLB ASE aft frame tilt actuator (AFTA) table

    NASA Technical Reports Server (NTRS)

    1991-01-01

    During STS-43 the Tracking and Data Relay Satellite E (TDRS-E) atop the inertial upper stage (IUS) and positioned in the airborne support equipment (ASE) aft frame tilt actuator (AFTA) table with the forward frame ASE latch actuator released and umbilical cables separated is raised by the aft frame ASE electromechanical tilt actuator to a 58-degree deployment position. The scene is highlighted against the Earth's limb. In the foreground on the port side and mounted on a getaway special (GAS) adapter beam are (forward to aft) the two Shuttle Solar Backscatter Ultraviolet (SSBUV) GAS canisters (one with motorized door assembly (MDA)) and the Tank Pressure Control Experiment (TPCE) GAS canister. Along the starboard sill longeron is the Space Station Heat Pipe Advanced Radiator Element II (SHARE-II).

  15. Cone positioning device for oral radiation therapy.

    PubMed

    Mahanna, G K; Ivanhoe, J R; Attanasio, R A

    1994-06-01

    This article describes the fabrication and modification of a peroral cone-positioning device. The modification provides added cone stability and prevents tongue intrusion into the radiation field. This device provides a repeatable accurate cone/lesion relationship and the fabrication technique is simplified, accurate, and minimizes patient discomfort.

  16. Small Molecules in the Cone Snail Arsenal.

    PubMed

    Neves, Jorge L B; Lin, Zhenjian; Imperial, Julita S; Antunes, Agostinho; Vasconcelos, Vitor; Olivera, Baldomero M; Schmidt, Eric W

    2015-10-16

    Cone snails are renowned for producing peptide-based venom, containing conopeptides and conotoxins, to capture their prey. A novel small-molecule guanine derivative with unprecedented features, genuanine, was isolated from the venom of two cone snail species. Genuanine causes paralysis in mice, indicating that small molecules and not just polypeptides may contribute to the activity of cone snail venom.

  17. Autonomous regulation of growth cone filopodia.

    PubMed

    Rehder, V; Cheng, S

    1998-02-05

    The fan-shaped array of filopodia is the first site of contact of a neuronal growth cone with molecules encountered during neuronal pathfinding. Filopodia are highly dynamic structures, and the "action radius" of a growth cone is strongly determined by the length and number of its filopodia. Since interactions of filopodia with instructive cues in the vicinity of the growth cone can have effects on growth cone morphology within minutes, it has to be assumed that a large part of the signaling underlying such morphological changes resides locally within the growth cone proper. In this study, we tested the hypothesis that two important growth cone parameters-namely, the length and number of its filopodia-are regulated autonomously in the growth cone. We previously demonstrated in identified neurons from the snail Helisoma trivolvis that filopodial length and number are regulated by intracellular calcium. Here, we investigated filopodial dynamics and their regulation by the second-messenger calcium in growth cones which were physically isolated from their parent neuron by neurite transection. Our results show that isolated growth cones have longer but fewer filopodia than growth cones attached to their parent cell. These isolated growth cones, however, are fully capable of undergoing calcium-induced cytoskeletal changes, suggesting that the machinery necessary to perform changes in filopodial length and number is fully intrinsic to the growth cone proper.

  18. Cone selectivity derived from the responses of the retinal cone mosaic to natural scenes.

    PubMed

    Wachtler, Thomas; Doi, Eizaburo; Lee, Te- Won; Sejnowski, Terrence J

    2007-06-18

    To achieve color vision, the brain has to process signals of the cones in the retinal photoreceptor mosaic in a cone-type-specific way. We investigated the possibility that cone-type-specific wiring is an adaptation to the statistics of the cone signals. We analyzed estimates of cone responses to natural scenes and found that there is sufficient information in the higher order statistics of L- and M-cone responses to distinguish between cones of different types, enabling unsupervised learning of cone-type specificity. This was not the case for a fourth cone type with spectral sensitivity between L and M cones, suggesting an explanation for the lack of strong tetrachromacy in heterozygous carriers of color deficiencies.

  19. Cone selectivity derived from the responses of the retinal cone mosaic to natural scenes

    PubMed Central

    Doi, Eizaburo; Lee, Te-Won; Sejnowski, Terrence J.

    2010-01-01

    To achieve color vision, the brain has to process signals of the cones in the retinal photoreceptor mosaic in a cone-type-specific way. We investigated the possibility that cone-type-specific wiring is an adaptation to the statistics of the cone signals. We analyzed estimates of cone responses to natural scenes and found that there is sufficient information in the higher order statistics of L- and M-cone responses to distinguish between cones of different types, enabling unsupervised learning of cone-type specificity. This was not the case for a fourth cone type with spectral sensitivity between L and M cones, suggesting an explanation for the lack of strong tetrachromacy in heterozygous carriers of color deficiencies. PMID:17685813

  20. DOS cones along atomic chains

    NASA Astrophysics Data System (ADS)

    Kwapiński, Tomasz

    2017-03-01

    The electron transport properties of a linear atomic chain are studied theoretically within the tight-binding Hamiltonian and the Green’s function method. Variations of the local density of states (DOS) along the chain are investigated. They are crucial in scanning tunnelling experiments and give important insight into the electron transport mechanism and charge distribution inside chains. It is found that depending on the chain parity the local DOS at the Fermi level can form cone-like structures (DOS cones) along the chain. The general condition for the local DOS oscillations is obtained and the linear behaviour of the local density function is confirmed analytically. DOS cones are characterized by a linear decay towards the chain which is in contrast to the propagation properties of charge density waves, end states and Friedel oscillations in one-dimensional systems. We find that DOS cones can appear due to non-resonant electron transport, the spin–orbit scattering or for chains fabricated on a substrate with localized electrons. It is also shown that for imperfect chains (e.g. with a reduced coupling strength between two neighboring sites) a diamond-like structure of the local DOS along the chain appears.

  1. Effect of underwing aft-mounted nacelles on the longitudinal aerodynamic characteristics of a high-wing transport airplane

    NASA Technical Reports Server (NTRS)

    Abeyounis, W. K.; Patterson, J. C., Jr.

    1985-01-01

    As part of a propulsion/airframe integration program, tests were conducted in the Langley 16-Foot Transonic Tunnel to determine the longitudinal aerodynamic effects of installing flow through engine nacelles in the aft underwing position of a high wing transonic transfer airplane. Mixed flow nacelles with circular and D-shaped inlets were tested at free stream Mach numbers from 0.70 to 0.85 and angles of attack from -2.5 deg to 4.0 deg. The aerodynamic effects of installing antishock bodies on the wing and nacelle upper surfaces as a means of attaching and supporting nacelles in an extreme aft position were investigated.

  2. Directional imaging of the retinal cone mosaic.

    PubMed

    Vohnsen, Brian; Iglesias, Ignacio; Artal, Pablo

    2004-05-01

    We describe a near-IR scanning laser ophthalmoscope that allows the retinal cone mosaic to be imaged in the human eye in vivo without the use of wave-front correction techniques. The method takes advantage of the highly directional quality of cone photoreceptors that permits efficient coupling of light to individual cones and subsequent detection of most directional components of the backscattered light produced by the light-guiding effect of the cones. We discuss details of the system and describe cone-mosaic images obtained under different conditions.

  3. CANAL EXITING FLUME AND BEGINNING EARTHLINED MAIN SECTION AT MOUTH ...

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

    CANAL EXITING FLUME AND BEGINNING EARTH-LINED MAIN SECTION AT MOUTH OF PLATTE RIVER CANYON. VIEW TO WEST - High Line Canal, Mouth of South Platte River to confluence with Second Creek, Denver, Denver County, CO

  4. Exit, Punishment and Rewards in Commons Dilemmas: An Experimental Study

    PubMed Central

    Bravo, Giangiacomo; Squazzoni, Flaminio

    2013-01-01

    Commons dilemmas are interaction situations where a common good is provided or exploited by a group of individuals so that optimal collective outcomes clash with private interests. Although in these situations, social norms and institutions exist that might help individuals to cooperate, little is known about the interaction effects between positive and negative incentives and exit options by individuals. We performed a modified public good game experiment to examine the effect of exit, rewards and punishment, as well as the interplay between exit and rewards and punishment. We found that punishment had a stronger effect than rewards on cooperation if considered by itself, whereas rewards had a stronger effect when combined with voluntary participation. This can be explained in terms of the ‘framing effect’, i.e., as the combination of exit and rewards might induce people to attach higher expected payoffs to cooperative strategies and expect better behaviour from others. PMID:23936356

  5. Interior detail of exit door on second floor at north ...

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

    Interior detail of exit door on second floor at north end; camera facing north. - Mare Island Naval Shipyard, WAVES Officers Quarters, Cedar Avenue, west side between Tisdale Avenue & Eighth Street, Vallejo, Solano County, CA

  6. BASEMENT, A view looking east into Room 24. An exit ...

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

    BASEMENT, A view looking east into Room 24. An exit door is at the far end - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  7. North wall, near east end, showing exhaust fan and exit ...

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

    North wall, near east end, showing exhaust fan and exit (series 3 of 4) - Bureau of Mines Metallurgical Research Laboratory, Original Building, Date Street north of U.S. Highway 93, Boulder City, Clark County, NV

  8. ARROYO SECO PARKWAY SOUTHBOUND LANES AND EXIT RAMP TO ORANGE ...

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

    ARROYO SECO PARKWAY SOUTHBOUND LANES AND EXIT RAMP TO ORANGE GROVE AVENUE. ORANGE GROVE AVENUE BRIDGE IN REAR. LOOKING 278°W - Arroyo Seco Parkway, Orange Grove Avenue Bridge, Milepost 30.59, Los Angeles, Los Angeles County, CA

  9. Exit, punishment and rewards in commons dilemmas: an experimental study.

    PubMed

    Bravo, Giangiacomo; Squazzoni, Flaminio

    2013-01-01

    Commons dilemmas are interaction situations where a common good is provided or exploited by a group of individuals so that optimal collective outcomes clash with private interests. Although in these situations, social norms and institutions exist that might help individuals to cooperate, little is known about the interaction effects between positive and negative incentives and exit options by individuals. We performed a modified public good game experiment to examine the effect of exit, rewards and punishment, as well as the interplay between exit and rewards and punishment. We found that punishment had a stronger effect than rewards on cooperation if considered by itself, whereas rewards had a stronger effect when combined with voluntary participation. This can be explained in terms of the 'framing effect', i.e., as the combination of exit and rewards might induce people to attach higher expected payoffs to cooperative strategies and expect better behaviour from others.

  10. Journey of water in pine cones

    PubMed Central

    Song, Kahye; Yeom, Eunseop; Seo, Seung-Jun; Kim, Kiwoong; Kim, Hyejeong; Lim, Jae-Hong; Joon Lee, Sang

    2015-01-01

    Pine cones fold their scales when it rains to prevent seeds from short-distance dispersal. Given that the scales of pine cones consist of nothing but dead cells, this folding motion is evidently related to structural changes. In this study, the structural characteristics of pine cones are studied on micro-/macro-scale using various imaging instruments. Raindrops fall along the outer scales to the three layers (bract scales, fibers and innermost lignified structure) of inner pine cones. However, not all the layers but only the bract scales get wet and then, most raindrops move to the inner scales. These systems reduce the amount of water used and minimize the time spent on structural changes. The result shows that the pine cones have structural advantages that could influence the efficient motion of pine cones. This study provides new insights to understand the motion of pine cones and would be used to design a novel water transport system. PMID:25944117

  11. Journey of water in pine cones

    NASA Astrophysics Data System (ADS)

    Song, Kahye; Yeom, Eunseop; Seo, Seung-Jun; Kim, Kiwoong; Kim, Hyejeong; Lim, Jae-Hong; Joon Lee, Sang

    2015-05-01

    Pine cones fold their scales when it rains to prevent seeds from short-distance dispersal. Given that the scales of pine cones consist of nothing but dead cells, this folding motion is evidently related to structural changes. In this study, the structural characteristics of pine cones are studied on micro-/macro-scale using various imaging instruments. Raindrops fall along the outer scales to the three layers (bract scales, fibers and innermost lignified structure) of inner pine cones. However, not all the layers but only the bract scales get wet and then, most raindrops move to the inner scales. These systems reduce the amount of water used and minimize the time spent on structural changes. The result shows that the pine cones have structural advantages that could influence the efficient motion of pine cones. This study provides new insights to understand the motion of pine cones and would be used to design a novel water transport system.

  12. Severe micrognathia: indications for EXIT-to-Airway.

    PubMed

    Morris, Lee M; Lim, Foong-Yen; Elluru, Ravindhra G; Hopkin, Robert J; Jaekle, Ronald K; Polzin, William J; Crombleholme, Timothy M

    2009-01-01

    The ex utero intrapartum treatment (EXIT) procedure has become an important management option in cases of fetal airway obstruction. Select cases of severe micrognathia may be candidates for EXIT-to-Airway due to high-risk of airway obstruction at birth. Here we present three successful EXIT-to-Airway procedures for the management of congenital micrognathia in its most severe manifestations. CASE 1: A 23-year-old G3P1011 with a pregnancy complicated by severe micorgnathia, jaw index <5th percentile, as well as polyhydramnios. At 36 weeks EXIT-to-Airway was performed utilizing a bronchoscopically positioned laryngeal mask airway (LMA) during 23 min of uteroplacental support followed by tracheostomy. CASE 2: A 26-year-old G4P0120 with a pregnancy complicated by severe micrognathia, jaw index <5th percentile, and an obstructed oropharynx associated with polyhydramnios. At 37 weeks EXIT-to-Airway was performed with placement of tracheostomy. CASE 3: A 36-year-old G6P3023 with fetal magnetic resonance imaging (MRI) revealing esophageal atresia, polyhydramnios, and severe micrognathia with a jaw index <5th percentile. At 35 weeks the patient underwent EXIT-to-Airway with formal tracheostomy during 35 min of uteroplacental bypass. In the most severe cases of fetal micrognathia, EXIT-to-Airway provides time to evaluate and secure the fetal airway prior to delivery. We propose indications for EXIT-to-Airway in micrognathia to include a jaw index <5%, with indirect evidence of aerodigestive tract obstruction such as polyhydramnios, glossoptosis or an absent stomach bubble.

  13. The effects of initial jet exit conditions on plume resonance

    NASA Technical Reports Server (NTRS)

    Ponton, Michael K.; Seiner, John M.

    1989-01-01

    The acoustic emission and boundary layer of a cold jet issuing from an underexpanded sonic nozzle have been measured for lip thicknesses of the nozzle exit varying from 0.015-0.625 nozzle diameters. Near-field acoustic data demonstrate that the amplitude and frequency of certain modes of screech and the dominant mode of instability which exists in the shear layer are dependent on nozzle lip thickness. Changes in momentum thickness due to variations in the nozzle exit were also quantified.

  14. View of compartment A102 bread room from forward to AFT. ...

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

    View of compartment A-102 bread room from forward to AFT. Wood slat decking and ceiling helps to provide adequate air circulation to aid in preservation of flour and baking supplies. Enclosed structure at right of photograph is a portion of the port side coffer dam. The coffer dam ia a partial inner hull to prevent flooding if the outer hull was breached. Originally the coffer dam was filled with water-resistant cellulose mad from corncobs. This material would swell with incoming water if the hull was breached and seal off the hole. Ordinary leakage kept the material wet and created ideal conditions for rot. The material was removed from the coffer dam. Ducts at right provide fresh air to the bread room. (09) - USS Olympia, Penn's Landing, 211 South Columbus Boulevard, Philadelphia, Philadelphia County, PA

  15. Technicians test OV-102's aft fuselage LRU hydrogen recirculation pump

    NASA Technical Reports Server (NTRS)

    1990-01-01

    Donald C. Buckner, a Lockheed mechanical lead technician, installs an aft fuselage line replaceable unit (LRU) liquid hydrogen recirculation pump from Columbia, Orbiter Vehicle (OV) 102 into JSC's Thermochemical Test Area (TTA) Support Laboratory Bldg 350 test stand. Technicians ran the pump package through the battery of leak tests. Preliminary indications showed only minor, acceptable leakage from the package and Kennedy Space Center (KSC) technicians have replaced a crushed seal on the prevalve of the main propulsion system they believe may have caused the STS-35 hydrogen leak. In addition to Buckner, (left to right) Larry Kilbourn, a Rockwell Service Center lead mechanical technician from Cape Canaveral, and John Dickerson, a quality inspector with EBASCO Services, also monitored the test at JSC. Photo taken by JSC photographer Benny Benavides.

  16. STS-57 MS2 Sherlock operates RMS THC on OV-105's aft flight deck

    NASA Technical Reports Server (NTRS)

    1993-01-01

    STS-57 Mission Specialist 2 (MS2) Nancy J. Sherlock operates the remote manipulator system (RMS) translation hand control (THC) while observing extravehicular activity (EVA) outside viewing window W10 on the aft flight deck of Endeavour, Orbiter Vehicle (OV) 105. Positioned at the onorbit station, Sherlock moved EVA astronauts in the payload bay (PLB). Payload Commander (PLC) G. David Low with his feet anchored to a special restraint device on the end of the RMS arm held MS3 Peter J.K. Wisoff during the RMS maneuvers. The activity represented an evaluation of techniques which might be used on planned future missions -- a 1993 servicing visit to the Hubble Space Telescope (HST) and later space station work -- which will require astronauts to frequently lift objects of similar sized bulk. Note: Just below Sherlock's left hand a 'GUMBY' toy watches the actvity.

  17. Aft-End Flow of a Large-Scale Lifting Body During Free-Flight Tests

    NASA Technical Reports Server (NTRS)

    Banks, Daniel W.; Fisher, David F.

    2006-01-01

    Free-flight tests of a large-scale lifting-body configuration, the X-38 aircraft, were conducted using tufts to characterize the flow on the aft end, specifically in the inboard region of the vertical fins. Pressure data was collected on the fins and base. Flow direction and movement were correlated with surface pressure and flight condition. The X-38 was conceived to be a rescue vehicle for the International Space Station. The vehicle shape was derived from the U.S. Air Force X-24 lifting body. Free-flight tests of the X-38 configuration were conducted at the NASA Dryden Flight Research Center at Edwards Air Force Base, California from 1997 to 2001.

  18. GPACC program cost work breakdown structure-dictionary. General purpose aft cargo carrier study, volume 3

    NASA Technical Reports Server (NTRS)

    1985-01-01

    The results of detailed cost estimates and economic analysis performed on the updated Model 101 configuration of the general purpose Aft Cargo Carrier (ACC) are given. The objective of this economic analysis is to provide the National Aeronautics and Space Administration (NASA) with information on the economics of using the ACC on the Space Transportation System (STS). The detailed cost estimates for the ACC are presented by a work breakdown structure (WBS) to ensure that all elements of cost are considered in the economic analysis and related subsystem trades. Costs reported by WBS provide NASA with a basis for comparing competing designs and provide detailed cost information that can be used to forecast phase C/D planning for new projects or programs derived from preliminary conceptual design studies. The scope covers all STS and STS/ACC launch vehicle cost impacts for delivering payloads to a 160 NM low Earth orbit (LEO).

  19. STS-56 Commander Cameron uses SAREX on OV-103's aft flight deck

    NASA Technical Reports Server (NTRS)

    1993-01-01

    STS-56 Commander Kenneth Cameron, wearing headset and headband equipped with penlight flashlight, uses the Shuttle Amateur Radio Experiment II (SAREX-II) on the aft flight deck of Discovery, Orbiter Vehicle (OV) 103. Cameron, positioned just behind the pilots seat, talks to amateur radio operators on Earth via the SAREX equipment. SAREX cables and the interface module freefloat in front of the pilots seat. The SAREX scan converter (a white box) is seen just above Cameron's head attached to overhead panel O9. SAREX was established by NASA, the American Radio League/Amateur Radio Satellite Corporation and the JSC Amateur Radio Club to encourage public participation in the space program through a program to demonstrate the effectiveness of conducting short-wave radio transmissions between the Shuttle and ground-based radio operators at low-cost ground stations with amateur and digital techniques. As on several previous missions, SAREX was used on this flight as an educational opportunity

  20. Understanding human queuing behaviour at exits: an empirical study

    PubMed Central

    Wagoum, A. U. Kemloh; Liao, W.

    2017-01-01

    The choice of the exit to egress from a facility plays a fundamental role in pedestrian modelling and simulation. Yet, empirical evidence for backing up simulation is scarce. In this contribution, we present three new groups of experiments that we conducted in different geometries. We varied parameters such as the width of the doors, the initial location and number of pedestrians which in turn affected their perception of the environment. We extracted and analysed relevant indicators such as distance to the exits and density levels. The results put in evidence the fact that pedestrians use time-dependent information to optimize their exit choice, and that, in congested states, a load balancing over the exits occurs. We propose a minimal modelling approach that covers those situations, especially the cases where the geometry does not show a symmetrical configuration. Most of the models try to achieve the load balancing by simulating the system and solving optimization problems. We show statistically and by simulation that a linear model based on the distance to the exits and the density levels around the exit can be an efficient dynamical alternative. PMID:28280588

  1. Spatial signals link exit from mitosis to spindle position

    PubMed Central

    Falk, Jill Elaine; Tsuchiya, Dai; Verdaasdonk, Jolien; Lacefield, Soni; Bloom, Kerry; Amon, Angelika

    2016-01-01

    In budding yeast, if the spindle becomes mispositioned, cells prevent exit from mitosis by inhibiting the mitotic exit network (MEN). The MEN is a signaling cascade that localizes to spindle pole bodies (SPBs) and activates the phosphatase Cdc14. There are two competing models that explain MEN regulation by spindle position. In the 'zone model', exit from mitosis occurs when a MEN-bearing SPB enters the bud. The 'cMT-bud neck model' posits that cytoplasmic microtubule (cMT)-bud neck interactions prevent MEN activity. Here we find that 1) eliminating cMT– bud neck interactions does not trigger exit from mitosis and 2) loss of these interactions does not precede Cdc14 activation. Furthermore, using binucleate cells, we show that exit from mitosis occurs when one SPB enters the bud despite the presence of a mispositioned spindle. We conclude that exit from mitosis is triggered by a correctly positioned spindle rather than inhibited by improper spindle position. DOI: http://dx.doi.org/10.7554/eLife.14036.001 PMID:27166637

  2. Fore-Aft Ground Force Adaptations to Induced Forelimb Lameness in Walking and Trotting Dogs

    PubMed Central

    Abdelhadi, Jalal; Wefstaedt, Patrick; Nolte, Ingo; Schilling, Nadja

    2012-01-01

    Animals alter their locomotor mechanics to adapt to a loss of limb function. To better understand their compensatory mechanisms, this study evaluated the changes in the fore-aft ground forces to forelimb lameness and tested the hypothesis that dogs unload the affected limb by producing a nose-up pitching moment via the exertion of a net-propulsive force when the lame limb is on the ground. Seven healthy Beagles walked and trotted at steady speed on an instrumented treadmill while horizontal force data were collected before and after a moderate lameness was induced. Peak, mean and summed braking and propulsive forces as well as the duration each force was exerted and the time to reach maximum force were evaluated for both the sound and the lame condition. Compared with the sound condition, a net-propulsive force was produced by the lame diagonal limbs due to a reduced braking force in the affected forelimb and an increased propulsive force in the contralateral hindlimb when the dogs walked and trotted. To regain pitch stability and ensure steady speed for a given locomotor cycle, the dogs produced a net-braking force when the sound diagonal limbs were on the ground by exerting greater braking forces in both limbs during walking and additionally reducing the propulsive force in the hindlimb during trotting. Consistent with the proposed mechanism, dogs maximize their double support phases when walking. Likely associated with the fore-aft force adaptations to lameness are changes in muscle recruitment that potentially result in short- and long-term effects on the limb and trunk muscles. PMID:23300614

  3. Primate translational vestibuloocular reflexes. II. Version and vergence responses to fore-aft motion

    NASA Technical Reports Server (NTRS)

    McHenry, M. Q.; Angelaki, D. E.

    2000-01-01

    To maintain binocular fixation on near targets during fore-aft translational disturbances, largely disjunctive eye movements are elicited the amplitude and direction of which should be tuned to the horizontal and vertical eccentricities of the target. The eye movements generated during this task have been investigated here as trained rhesus monkeys fixated isovergence targets at different horizontal and vertical eccentricities during 10 Hz fore-aft oscillations. The elicited eye movements complied with the geometric requirements for binocular fixation, although not ideally. First, the corresponding vergence angle for which the movement of each eye would be compensatory was consistently less than that dictated by the actual fixation parameters. Second, the eye position with zero sensitivity to translation was not straight ahead, as geometrically required, but rather exhibited a systematic dependence on viewing distance and vergence angle. Third, responses were asymmetric, with gains being larger for abducting and downward compared with adducting and upward gaze directions, respectively. As frequency was varied between 4 and 12 Hz, responses exhibited high-pass filter properties with significant differences between abduction and adduction responses. As a result of these differences, vergence sensitivity increased as a function of frequency with a steeper slope than that of version. Despite largely undercompensatory version responses, vergence sensitivity was closer to ideal. Moreover, the observed dependence of vergence sensitivity on vergence angle, which was varied between 2.5 and 10 MA, was largely linear rather than quadratic (as geometrically predicted). We conclude that the spatial tuning of eye velocity sensitivity as a function of gaze and viewing distance follows the general geometric dependencies required for the maintenance of foveal visual acuity. However, systematic deviations from ideal behavior exist that might reflect asymmetric processing of

  4. Water impact test of aft skirt end ring, and mid ring segments of the Space Shuttle Solid Rocket Booster

    NASA Technical Reports Server (NTRS)

    1983-01-01

    The results of water impact loads tests using aft skirt end ring, and mid ring segments of the Space Shuttle Solid Rocket Booster (SRB) are examined. Dynamic structural response data is developed and an evaluation of the model in various configurations is presented. Impact velocities are determined for the SRB with the larger main chute system. Various failure modes are also investigated.

  5. Cardiac cone-beam CT

    SciTech Connect

    Manzke, Robert . E-mail: robert.manzke@philips.com

    2005-10-15

    This doctoral thesis addresses imaging of the heart with retrospectively gated helical cone-beam computed tomography (CT). A thorough review of the CT reconstruction literature is presented in combination with a historic overview of cardiac CT imaging and a brief introduction to other cardiac imaging modalities. The thesis includes a comprehensive chapter about the theory of CT reconstruction, familiarizing the reader with the problem of cone-beam reconstruction. The anatomic and dynamic properties of the heart are outlined and techniques to derive the gating information are reviewed. With the extended cardiac reconstruction (ECR) framework, a new approach is presented for the heart-rate-adaptive gated helical cardiac cone-beam CT reconstruction. Reconstruction assessment criteria such as the temporal resolution, the homogeneity in terms of the cardiac phase, and the smoothness at cycle-to-cycle transitions are developed. Several reconstruction optimization approaches are described: An approach for the heart-rate-adaptive optimization of the temporal resolution is presented. Streak artifacts at cycle-to-cycle transitions can be minimized by using an improved cardiac weighting scheme. The optimal quiescent cardiac phase for the reconstruction can be determined automatically with the motion map technique. Results for all optimization procedures applied to ECR are presented and discussed based on patient and phantom data. The ECR algorithm is analyzed for larger detector arrays of future cone-beam systems throughout an extensive simulation study based on a four-dimensional cardiac CT phantom. The results of the scientific work are summarized and an outlook proposing future directions is given. The presented thesis is available for public download at www.cardiac-ct.net.

  6. Missile and Spacecraft Coning Instabilities

    DTIC Science & Technology

    2007-11-02

    181-192. "Mingori, D. L., and Yam, T., " Nutational Stability of a Spinning Space- craft with Internal Mass Motion and Axial Thrust," AIAA Paper 86...Nomenclature 1 Introduction 1 Equations of Motion 2 Yaw Moment Damping or Undamping 2 Spacecraft Precession Damper 3 Vehicle Coning with Axial ...with Axial Thrust and Variable Mass The variable mass accompanying thrust from a spin-stabilized rocket motor or PAM produces a destabilizing effect

  7. Bursting the Taylor cone bubble

    NASA Astrophysics Data System (ADS)

    Pan, Zhao; Truscott, Tadd

    2014-11-01

    A soap bubble fixed on a surface and placed in an electric field will take on the shape of a cone rather than constant curvature (dome) when the electrical field is not present. The phenomenon was introduced by J. Zeleny (1917) and studied extensively by C.T. Wilson & G.I. Taylor (1925). We revisit the Taylor cone problem by studying the deformation and bursting of soap bubbles in a point charge electric field. A single bubble takes on the shape of a cone in the electric field and a high-speed camera equipped with a micro-lens is used to observe the unsteady dynamics at the tip. Rupture occurs as a very small piece of the tip is torn away from the bubble toward the point charge. Based on experiments, a theoretical model is developed that predicts when rupture should occur. This study may help in the design of foam-removal techniques in engineering and provide a better understanding of an electrified air-liquid interface.

  8. A Modified EXIT-to-ECMO with Optional Reservoir Circuit for Use during an EXIT Procedure Requiring Thoracic Surgery.

    PubMed

    Matte, Gregory S; Connor, Kevin R; Toutenel, Nathalia A; Gottlieb, Danielle; Fynn-Thompson, Francis

    2016-03-01

    A 34 year old mother with a history of polyhydraminos and premature rupture of membranes presented for an ex utero intrapartum treatment (EXIT) procedure to deliver her 34 week gestation fetus. The fetus had been diagnosed with a large cervical mass which significantly extended into the right chest. The mass compressed and deviated the airway and major neck vessels posteriorly. Imaging also revealed possible tumor involvement with the superior vena cava and right atrium. The plan was for potential extracorporeal membrane oxygenation (ECMO) during the EXIT procedure (EXIT-to-ECMO) and the potential for traditional cardiopulmonary bypass (CPB) for mediastinal tumor resection. A Modified EXIT-To-ECMO with Optional Reservoir (METEOR) circuit was devised to satisfy both therapies. A fetal airway could not be established during the EXIT procedure and so the EXIT-to-ECMO strategy was utilized. The fetus was then delivered and transferred to an adjoining operating room (OR). Traditional cardiopulmonary bypass with a cardiotomy venous reservoir (CVR) was utilized during the establishment of an airway, tumor biopsy and partial resection. The patient was eventually transitioned to our institution's standard ECMO circuit and then transferred to the intensive care unit. The patient was weaned from ECMO on day of life (DOL) eight and had a successful tumor resection on DOL 11. The patient required hospitalization for numerous interventions including cardiac surgery at 4 months of age. She was discharged to home at 5 months of age.

  9. Cone Penetrometer Off-Surface Sensor

    SciTech Connect

    Smail, T.R.; French, p.J.; Huffman, R.K.; Hebert, P.S.

    1999-10-20

    Cone penetrometer technology accounts for approximately 50 percent of the subsurface drilling done at the Savannah River Site. This technology provides a means of collecting data for use in the characterization of the subsurface. The cone penetrometer consists of a steel cone attached to a pipe column that is hydraulically inserted into the ground. To allow researchers to accurately measure subsurface properties, without the inherent problems of cone penetrometer equipment, the Savannah River Technology Center has developed the Cone Penetrometer Off-Surface Sensor (CPOSS). The CPOSS design consists of a knife-blade mechanism mounted along the surface of a module capable of attaching to existing cone penetrometer equipment and being deployed at depths of up to 200 feet. CPOSS development is the subject of this report.

  10. Mitotic Exit Control as an Evolved Complex System

    SciTech Connect

    Bosl, W; Li, R

    2005-04-25

    The exit from mitosis is the last critical decision a cell has to make during a division cycle. A complex regulatory system has evolved to evaluate the success of mitotic events and control this decision. Whereas outstanding genetic work in yeast has led to rapid discovery of a large number of interacting genes involved in the control of mitotic exit, it has also become increasingly difficult to comprehend the logic and mechanistic features embedded in the complex molecular network. Our view is that this difficulty stems in part from the attempt to explain mitotic exit control using concepts from traditional top-down engineering design, and that exciting new results from evolutionary engineering design applied to networks and electronic circuits may lend better insights. We focus on four particularly intriguing features of the mitotic exit control system: the two-stepped release of Cdc14; the self-activating nature of Tem1 GTPase; the spatial sensor associated with the spindle pole body; and the extensive redundancy in the mitotic exit network. We attempt to examine these design features from the perspective of evolutionary design and complex system engineering.

  11. Programming Retinal Stem Cells into Cone Photoreceptors

    DTIC Science & Technology

    2015-12-01

    to program human stem cells directly into cones. Using RNA -seq, we identified several genes that are upregulated in advance of the earliest...reverse vision loss. 15. SUBJECT TERMS Cone photoreceptor, retina, retinal stem cell, Otx2, Onecut1, Blimp1, RNA -seq., transcription factors, and...1 Keywords: 1. Cone photoreceptor 2. Retina 3. Retinal stem cell 4. Otx2 5. Onecut1 6. Blimp1 7. RNA -seq. 8. Transcription factors 9

  12. 29 CFR 1910.36 - Design and construction requirements for exit routes.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... your workplace, consult NFPA 101-2000, Life Safety Code. (c) Exit discharge. (1) Each exit discharge... open an exit route door from the inside at all times without keys, tools, or special knowledge. A... 101-2000, Life Safety Code. (g) An exit route must meet minimum height and width requirements. (1)...

  13. Cone opsins, colour blindness and cone dystrophy: Genotype-phenotype correlations.

    PubMed

    Gardner, J C; Michaelides, M; Hardcastle, A J

    2016-05-25

    X-linked cone photoreceptor disorders caused by mutations in the OPN1LW (L) and OPN1MW (M) cone opsin genes on chromosome Xq28 include a range of conditions from mild stable red-green colour vision deficiencies to severe cone dystrophies causing progressive loss of vision and blindness. Advances in molecular genotyping and functional analyses of causative variants, combined with deep retinal phenotyping, are unravelling genetic mechanisms underlying the variability of cone opsin disorders.

  14. Effects of fore-aft body mass distribution on acceleration in dogs.

    PubMed

    Walter, Rebecca M; Carrier, David R

    2011-05-15

    The ability of a quadruped to apply propulsive ground reaction forces (GRF) during rapid acceleration may be limited by muscle power, foot traction or the ability to counteract the nose-up pitching moment due to acceleration. Because the biomechanics of acceleration change, both throughout the stride cycle and over subsequent strides as velocity increases, the factors limiting propulsive force production may also change. Depending on which factors are limiting during each step, alterations in fore-aft body mass distribution may either increase or decrease the maximum propulsive GRF produced. We analyzed the effects of experimental alterations in the fore-aft body mass distribution of dogs as they performed rapid accelerations. We measured the changes in trunk kinematics and GRF as dogs accelerated while carrying 10% body mass in saddlebags positioned just in front of the shoulder girdle or directly over the pelvic girdle. We found that dogs applied greater propulsive forces in the initial hindlimb push-off and first step by the lead forelimb in both weighted conditions. During these steps dogs appear to have been limited by foot traction. For the trailing forelimb, propulsive forces and impulses were reduced when dogs wore caudally placed weights and increased when dogs wore cranially placed weights. This is consistent with nose-up pitching or avoidance thereof having limited propulsive force production by the trailing forelimb. By the second stride, the hindlimbs appear to have been limited by muscle power in their ability to apply propulsive force. Adding weights decreased the propulsive force they applied most in the beginning of stance, when limb retractor muscles were active in supporting body weight. These results suggest that all three factors: foot traction, pitching of the body, and muscle power play roles in limiting quadrupedal acceleration. Digging in to the substrate with claws or hooves appears to be necessary for maximizing propulsion in the initial

  15. Gas turbine combustor exit piece with hinged connections

    SciTech Connect

    Charron, Richard C.; Pankey, William W.

    2016-04-26

    An exit piece (66) with an inlet throat (67) that conducts a combustion gas flow (36A) in a path (82) from a combustor (63) to an annular chamber (68) that feeds the first blade section (37) of a gas turbine (26). The exit piece further includes an outlet portion (69) that forms a circumferential segment of the annular chamber. The outlet portion interconnects with adjacent outlet portions by hinges (78A, 78B, 80A, 80B). Each hinge may have a hinge axis (82A, 82B) parallel to a centerline (21) of the turbine. Respective gas flows (36A) are configured by an assembly (60) of the exit pieces to converge on the feed chamber (68) into a uniform helical flow that drives the first blade section with minimal circumferential variations in force.

  16. Cotranslational Protein Folding inside the Ribosome Exit Tunnel

    PubMed Central

    Nilsson, Ola B.; Hedman, Rickard; Marino, Jacopo; Wickles, Stephan; Bischoff, Lukas; Johansson, Magnus; Müller-Lucks, Annika; Trovato, Fabio; Puglisi, Joseph D.; O’Brien, Edward P.; Beckmann, Roland; von Heijne, Gunnar

    2015-01-01

    Summary At what point during translation do proteins fold? It is well established that proteins can fold cotranslationally outside the ribosome exit tunnel, whereas studies of folding inside the exit tunnel have so far detected only the formation of helical secondary structure and collapsed or partially structured folding intermediates. Here, using a combination of cotranslational nascent chain force measurements, inter-subunit fluorescence resonance energy transfer studies on single translating ribosomes, molecular dynamics simulations, and cryoelectron microscopy, we show that a small zinc-finger domain protein can fold deep inside the vestibule of the ribosome exit tunnel. Thus, for small protein domains, the ribosome itself can provide the kind of sheltered folding environment that chaperones provide for larger proteins. PMID:26321634

  17. A review of the EXIT (Ex utero Intrapartum Treatment) procedure.

    PubMed

    Abraham, R J; Sau, A; Maxwell, D

    2010-01-01

    The EXIT (Ex utero Intrapartum Treatment) procedure is done in cases where difficulty is anticipated in neonatal airway establishment at delivery and is done at the time of caesarean section. The partially delivered fetus is maintained on placental circulation while airway is established and this is carried out by a multidisciplinary team. In this paper, we review the indications, the maternal and fetal considerations of the procedure and the results and outcomes. The review highlights the fact that the benefits far outweigh the risks and that the risk of postpartum haemorrhage is more theoretical than real. As technology improves and more anomalies are diagnosed during the antenatal period, the EXIT procedure can be performed with good results after carefully considering the ethical issues. We have performed a MEDLINE search by using the keywords EXIT, CHAOS, fetal surgery, fetal neck masses and ex utero intrapartum treatment. As there are not many large studies, we have also reviewed smaller case series and case reports.

  18. Nested-cone transformer antenna

    DOEpatents

    Ekdahl, C.A.

    1991-05-28

    A plurality of conical transmission lines are concentrically nested to form an output antenna for pulsed-power, radio-frequency, and microwave sources. The diverging conical conductors enable a high power input density across a bulk dielectric to be reduced below a breakdown power density at the antenna interface with the transmitting medium. The plurality of cones maintain a spacing between conductors which minimizes the generation of high order modes between the conductors. Further, the power input feeds are isolated at the input while enabling the output electromagnetic waves to add at the transmission interface. Thus, very large power signals from a pulse rf, or microwave source can be radiated. 6 figures.

  19. Nested-cone transformer antenna

    DOEpatents

    Ekdahl, Carl A.

    1991-01-01

    A plurality of conical transmission lines are concentrically nested to form n output antenna for pulsed-power, radio-frequency, and microwave sources. The diverging conical conductors enable a high power input density across a bulk dielectric to be reduced below a breakdown power density at the antenna interface with the transmitting medium. The plurality of cones maintain a spacing between conductors which minimizes the generation of high order modes between the conductors. Further, the power input feeds are isolated at the input while enabling the output electromagnetic waves to add at the transmission interface. Thus, very large power signals from a pulse rf, or microwave source can be radiated.

  20. Criticality safety analysis of a calciner exit chute

    SciTech Connect

    Haught, C.F.; Basoglu, B.; Brewer, R.W.; Hollenback, D.F.; Wilkinson, A.D.; Dodds, H.L. . Nuclear Engineering Dept.); Oxenham, R.L. )

    1994-01-01

    Calcination of uranyl nitrate into uranium oxide is part of normal operations of some enrichment plants. Typically, a calciner discharges uranium oxide powder (U[sub 3]O[sub 8]) into an exit chute that directs the powder into a receiving can located in a glove box. One possible scenario for a criticality accident is the exit chute becoming blocked with powder near its discharge. The blockage restricts the flow of powder causing the exit chute to become filled with the powder. If blockage does occur, the height of the powder could reach a level that would not be safe from a criticality point of view. In this analysis, the subcritical height limit is examined for 98% enriched U[sub 3]O[sub 8] in the exit chute with full water reflection and optimal water moderation. The height limit for ensuring criticality safety during such an accumulation is 28.2 cm above the top of the discharge pipe at the bottom of the chute. Chute design variations are also evaluated with full water reflection and optimal water moderation. Subcritical configurations for the exit chute variation are developed, but the configurations are not safe when combined with the calciner. To ensure criticality safety, modifications must be made to the calciner tube or safety measures must be implemented if these designs are to be utilized with 98% enriched material. A geometrically safe configuration for the exit chute is developed for a blockage of 20% enriched powder with full water reflection and optimal water moderation, and this configuration is safe when combined with the existing calciner.

  1. Cooling Air Inlet and Exit Geometries on Aircraft Engine Installations

    NASA Technical Reports Server (NTRS)

    Katz, Joseph; Corsiglia, Victor R.; Barlow, Philip R.

    1982-01-01

    A semispan wing and nacelle of a typical general aviation twin-engine aircraft was tested to evaluate the cooling capability and drag or several nacelle shapes; the nacelle shapes included cooling air inlet and exit variations. The tests were conducted in the Ames Research Center 40 x 80-ft Wind Tunnel. It was found that the cooling air inlet geometry of opposed piston engine installations has a major effect on inlet pressure recovery, but only a minor effect on drag. Exit location showed large effect on drag, especially for those locations on the sides of the nacelle where the suction characteristics were based on interaction with the wing surface pressures.

  2. Exit point in the strong field ionization process

    PubMed Central

    Ivanov, I. A.; Nam, Chang Hee; Kim, Kyung Taec

    2017-01-01

    We analyze the process of strong field ionization using the Bohmian approach. This allows retention of the concept of electron trajectories. We consider the tunnelling regime of ionization. We show that, in this regime, the coordinate distribution for the ionized electron has peaks near the points in space that can be interpreted as exit points. The interval of time during which ionization occurs is marked by a quick broadening of the coordinate distribution. The concept of the exit point in the tunneling regime, which has long been assumed for the description of strong field ionization, is justified by our analysis. PMID:28057938

  3. Exit point in the strong field ionization process

    NASA Astrophysics Data System (ADS)

    Ivanov, I. A.; Nam, Chang Hee; Kim, Kyung Taec

    2017-01-01

    We analyze the process of strong field ionization using the Bohmian approach. This allows retention of the concept of electron trajectories. We consider the tunnelling regime of ionization. We show that, in this regime, the coordinate distribution for the ionized electron has peaks near the points in space that can be interpreted as exit points. The interval of time during which ionization occurs is marked by a quick broadening of the coordinate distribution. The concept of the exit point in the tunneling regime, which has long been assumed for the description of strong field ionization, is justified by our analysis.

  4. Possible Tuff Cones In Isidis Planitia, Mars

    NASA Astrophysics Data System (ADS)

    Seabrook, A. M.; Rothery, D. A.; Bridges, J. C.; Wright, I. P.

    The Beagle 2 lander of the ESA Mars Express mission will touch down on the martian surface in December 2003 to conduct a primarily exobiological mission. The landing site will be within Isidis Planitia, an 1100 km diameter impact basin. Isidis contains many sub-kilometre-sized cones. These can be found singly, in clusters, and in straight or arcuate chains extending many kilometres. In some areas of the basin these cones can occupy over 10% of the surface, with the most densely populated areas being in the older western half of the basin. There are few cones around the basin rim. There is also variation in the erosional state of the cones both across the basin, and within smaller areas, implying a range in time of formation for the cones. We currently favour a tuff cone origin as an explanation for these features. Tuff cones on Earth are rooted volcanic features formed at vents by the interaction between magma or magmatic heat and surface or near-surface water. Lava flows likely to be associated with at least some of the cones if they had a cinder cone (rooted eruptions at vents in a dry environment) origin are absent. This suggests the involvement of suffi- cient volatiles both to explosively fragment the erupting magma, and to cool the ejecta enough to prevent the formation of clastogenic flows. If our tuff cone interpretation is correct, this has implications for the presence, abundance and long-term persistence of sub-surface volatiles (water or carbon dioxide) on Mars. An understanding of the mechanism of formation of the Isidis cones will assist the characterisation of the basin in preparation for the landing of Beagle 2, by providing information about the history of volatiles and volcanism in the basin, and the processes that resulted in the surface we see today.

  5. Vertical drop test of a transport fuselage section located aft of the wing

    NASA Technical Reports Server (NTRS)

    Fasanella, E. L.; Alfaro-Bou, E.

    1986-01-01

    A 12-foot long Boeing 707 aft fuselage section with a tapering cross section was drop tested at the NASA Langley Research Center to measure structural, seat, and occupant response to vertical crash laods and to provide data for nonlinear finite element modeling. This was the final test in a series of three different transport fuselage sections tested under identical conditions. The test parameters at impact were: 20 ft/s velocity, and zero pitch, roll, and yaw. In addition, the test was an operational shock test of the data acquisition system used for the Controlled Impact Demonstration (CID) of a remotely piloted Boeing 720 that was crash tested at NASA Ames Dryden Flight Research Facility on December 1, 1984. Post-test measurements of the crush showed that the front of the section (with larger diameter) crushed vertically approximately 14 inches while the rear crushed 18 inches. Analysis of the data traces indicate the maximum peak normal (vertical) accelerations at the bottom of the frames were approximately 109 G at body station 1040 and 64 G at body station 1120. The peak floor acceleration varied from 14 G near the wall to 25 G near the center where high frequency oscillations of the floor were evident. The peak anthropomorphic dummy pelvis normal (vertical) acceleration was 19 G's.

  6. Masking of thresholds for the perception of fore-and-aft vibration of seat backrests.

    PubMed

    Morioka, Miyuki; Griffin, Michael J

    2015-09-01

    The detection of a vibration may be reduced by the presence of another vibration: a phenomenon known as 'masking'. This study investigated how the detection of one frequency of vibration is influenced by vibration at another frequency. With nine subjects, thresholds for detecting fore-and-aft backrest vibration were determined (for 4, 8, 16, and 31.5-Hz sinusoidal vibration) in the presence of a masker vibration (4-Hz random vibration, 1/3-octave bandwidth at six intensities). The masker vibration increased thresholds for perceiving vibration at each frequency by an amount that reduced with increasing difference between the frequency of the sinusoidal vibration and the frequency of the masker vibration. The 4-Hz random vibration almost completely masked 4-Hz sinusoidal vibration, partially masked 8- and 16-Hz vibration, and only slightly masked 31.5-Hz vibration. The findings might be explained by the involvement of different sensory systems and different body locations in the detection of different frequencies of vibration.

  7. Aircraft system aft telescope cavity configuration study for Stratospheric Observatory for Infrared Astronomy (SOFIA), phase 2

    NASA Technical Reports Server (NTRS)

    1994-01-01

    The SOFIA Aircraft System (AS) Phase 1 Study was a broad-based study which addressed itself to satisfying technical and programmatic requirements by drawing from existing technology and applying cost-efficient commercial approaches to the aircraft modification. In this SOFIA AS Phase 2 Study, five critical areas of the aircraft were selected for more detailed investigation: forward pressure bulkhead, aft bulkhead, 'free' shell to bulkhead interface, shell cut-out to bulkhead interface, and flooring. The in-depth investigation of these areas upon a finite element model (FEM), with a fine grid model in areas of particular interest, is discussed. The FEM code used is called 'STRAP' and was developed by the engineering firm, Rasmussen and Associates. STRAP is NASTRAN compatible to within 1%. The loads applied to the model were approximated from known 747 envelope conditions. The areas of investigation, and a section through the fuselage is shown. The thrust of this investigation was to develop the design concepts conceived under phase 1 to the point where detailed design could be undertaken with a high level of confidence.

  8. Use of photostress to analyze behavior of an aft skirt test specimen

    NASA Technical Reports Server (NTRS)

    Gambrell, S. C., Jr.

    1994-01-01

    Strains at twenty-one selected points in the critical lower weld region of a aft skirt of a solid rocket booster of the shuttle were measured using photoelastic coatings and stress separator gages. Data were taken at loads of 5, 14, 20, 28, 42, 56, and 70 percent of the design limit load. Results indicate that general yielding occurred in the weld metal and for a short distance outside the fusion boundaries on either side of the weld metal. The fusion boundaries did not yield at the 70 percent load. Slight non-linearity in the load strain curves were observed at several points above the 20 percent load level. Maximum measured strains occurred at points in the forged metal of the holddown post along a line 0.50 inches from the centerline of the weld. Maximum shearing strains within the area covered by the photoelastic coating occurred at points approximately 0.33 inches to the right of the weld centerline near points 6 and 7 and lying along a yellow vertical line extending from just below point 6 to point 11. Photoelastic coatings were shown to be an excellent method to provide the whole field strain distribution in the region of the critical weld and to enhance the overall understanding of the behavior of the welded joint.

  9. Analysis of pressure blips in aft-finocyl solid rocket motor

    NASA Astrophysics Data System (ADS)

    Di Giacinto, M.; Favini, B.; Cavallini, E.

    2016-07-01

    Ballistic anomalies have frequently occurred during the firing of several solid rocket motors (SRMs) (Inertial Upper Stage, Space Shuttle Redesigned SRM (RSRM) and Titan IV SRM Upgrade (SRMU)), producing even relevant and unexpected variations of the SRM pressure trace from its nominal profile. This paper has the purpose to provide a numerical analysis of the following possible causes of ballistic anomalies in SRMs: an inert object discharge, a slag ejection, and an unexpected increase in the propellant burning rate or in the combustion surface. The SRM configuration under investigation is an aft-finocyl SRM with a first-stage/small booster design. The numerical simulations are performed with a quasi-one-dimensional (Q1D) unsteady model of the SRM internal ballistics, properly tailored to model each possible cause of the ballistic anomalies. The results have shown that a classification based on the head-end pressure (HEP) signature, relating each other the HEP shape and the ballistic anomaly cause, can be made. For each cause of ballistic anomalies, a deepened discussion of the parameters driving the HEP signatures is provided, as well as qualitative and quantitative assessments of the resultant pressure signals.

  10. Investigation of the transmission of fore and aft vibration through the human body.

    PubMed

    Demić, Miroslav; Lukić, Jovanka

    2009-07-01

    Understanding the behavior of human body under the influence of vibration is of great importance for the optimal motor vehicle system design. Therefore, great efforts are being done in order to discover as many information about the influence of vibration on human body as possible. So far the references show that the major scientific attention has been paid to vertical vibration, although intensive research has been performed lately on the other sorts of excitation. In this paper, the results of the investigation of behavior of human body, in seated position, under the influence of random fore and aft vibration are shown. The investigation is performed by the use of an electro-hydraulic simulator, on a group of 30 healthy male occupants. Experiments are performed in order to give results to improve human body modeling in driving conditions. Excitation amplitudes (1.75 and 2.25 m/s(2) rms) and seat backrest conditions (with and without inclination) were varied. Data results are analyzed by partial coherence and transfer functions. Analyses have been performed and results are given in detail. The results obtained have shown that the human body under the influence of random excitations behaves as a non-linear system and its response depends on spatial position. Obtained results give necessary data to define structure and parameters of human biodynamic model with respect to different excitation and seat backrest position.

  11. STS-99 workers move new Master Events Controller into aft compartment

    NASA Technical Reports Server (NTRS)

    2000-01-01

    At Launch Pad 39A, workers move the replacement Enhanced Main Events Controller (E-MEC) into Shuttle Endeavour's aft compartment in the payload bay. The original E-MEC became suspect during the Jan. 31 launch countdown and mission STS-99 was delayed when NASA managers decided to replace it. Each Shuttle carries two enhanced master events controllers (E-MECs), which provide relays for onboard flight computers to send signals to arm and fire pyrotechnics that separate the solid rockets and external tank during assent. Both E-MECs are needed for the Shuttle to be cleared for flight. Currently Endeavour and Columbia are the only two orbiters with the E-MECs. Built by Rockwell's Satellite Space Electronics Division, Anaheim, Calif., each unit weighs 65 pounds and is approximately 20 inches long, 13 inches wide and 8 inches tall. Previously, three Shuttle flights have been scrubbed or delayed due to faulty MECs: STS-73, STS-49 and STS-41-D. The next scheduled date for launch of STS-99 is Feb. 11 at 12:30 p.m. EST.

  12. Low-speed stability and control characteristics of a transport model with aft-fuselage-mounted advanced turboprops

    NASA Technical Reports Server (NTRS)

    Applin, Z. T.; Coe, P. L., Jr.

    1986-01-01

    A limited experimental investigation was conducted in the Langley 4- by 7-Meter Tunnel to explore the effects of aft-fuselage-mounted advanced turboprop installations on the low-speed stability and control characteristics of a representative transport aircraft in a landing configuration. In general, the experimental results indicate that the longitudinal and lateral-directional stability characteristics for the aft-fuselage-mounted single-rotation tractor and counter-rotation pusher propeller configurations tested during this investigation are acceptable aerodynamically. For the single-rotation tractor configuration, the propeller-induced aerodynamics are significantly influenced by the interaction of the propeller slipstream with the pylon and nacelle. The stability characteristics for the counter-rotation pusher configuration are strongly influenced by propeller normal forces. The longitudinal and directional control effectiveness, engine-out characteristics, and ground effects are also presented. In addition, a tabulated presentation of all aerodynamic data presented in this report is included as an appendix.

  13. Panoramic cone beam computed tomography

    SciTech Connect

    Chang Jenghwa; Zhou Lili; Wang Song; Clifford Chao, K. S.

    2012-05-15

    Purpose: Cone-beam computed tomography (CBCT) is the main imaging tool for image-guided radiotherapy but its functionality is limited by a small imaging volume and restricted image position (imaged at the central instead of the treatment position for peripheral lesions to avoid collisions). In this paper, the authors present the concept of ''panoramic CBCT,'' which can image patients at the treatment position with an imaging volume as large as practically needed. Methods: In this novel panoramic CBCT technique, the target is scanned sequentially from multiple view angles. For each view angle, a half scan (180 deg. + {theta}{sub cone} where {theta}{sub cone} is the cone angle) is performed with the imaging panel positioned in any location along the beam path. The panoramic projection images of all views for the same gantry angle are then stitched together with the direct image stitching method (i.e., according to the reported imaging position) and full-fan, half-scan CBCT reconstruction is performed using the stitched projection images. To validate this imaging technique, the authors simulated cone-beam projection images of the Mathematical Cardiac Torso (MCAT) thorax phantom for three panoramic views. Gaps, repeated/missing columns, and different exposure levels were introduced between adjacent views to simulate imperfect image stitching due to uncertainties in imaging position or output fluctuation. A modified simultaneous algebraic reconstruction technique (modified SART) was developed to reconstruct CBCT images directly from the stitched projection images. As a gold standard, full-fan, full-scan (360 deg. gantry rotation) CBCT reconstructions were also performed using projection images of one imaging panel large enough to encompass the target. Contrast-to-noise ratio (CNR) and geometric distortion were evaluated to quantify the quality of reconstructed images. Monte Carlo simulations were performed to evaluate the effect of scattering on the image quality and

  14. Explicit Finite Element Techniques Used to Characterize Splashdown of the Space Shuttle Solid Rocket Booster Aft Skirt

    NASA Technical Reports Server (NTRS)

    Melis, Matthew E.

    2003-01-01

    NASA Glenn Research Center s Structural Mechanics Branch has years of expertise in using explicit finite element methods to predict the outcome of ballistic impact events. Shuttle engineers from the NASA Marshall Space Flight Center and NASA Kennedy Space Flight Center required assistance in assessing the structural loads that a newly proposed thrust vector control system for the space shuttle solid rocket booster (SRB) aft skirt would expect to see during its recovery splashdown.

  15. Recoverin depletion accelerates cone photoresponse recovery

    PubMed Central

    Zang, Jingjing; Keim, Jennifer; Kastenhuber, Edda; Gesemann, Matthias; Neuhauss, Stephan C. F.

    2015-01-01

    The neuronal Ca2+-binding protein Recoverin has been shown to regulate phototransduction termination in mammalian rods. Here we identify four recoverin genes in the zebrafish genome, rcv1a, rcv1b, rcv2a and rcv2b, and investigate their role in modulating the cone phototransduction cascade. While Recoverin-1b is only found in the adult retina, the other Recoverins are expressed throughout development in all four cone types, except Recoverin-1a, which is expressed only in rods and UV cones. Applying a double flash electroretinogram (ERG) paradigm, downregulation of Recoverin-2a or 2b accelerates cone photoresponse recovery, albeit at different light intensities. Exclusive recording from UV cones via spectral ERG reveals that knockdown of Recoverin-1a alone has no effect, but Recoverin-1a/2a double-knockdowns showed an even shorter recovery time than Recoverin-2a-deficient larvae. We also showed that UV cone photoresponse kinetics depend on Recoverin-2a function via cone-specific kinase Grk7a. This is the first in vivo study demonstrating that cone opsin deactivation kinetics determine overall photoresponse shut off kinetics. PMID:26246494

  16. Cone penetrometer demonstration standard startup review checklist

    SciTech Connect

    KRIEG, S.A.

    1998-11-09

    Startup readiness for the Cone Penetrometer Demonstration in AX Tank Farm will be verified through the application of a Standard Startup Review Checklist. This is a listing of those items essential to demonstrating readiness to start the Cone Penetrometer Demonstration in AX Tank Farm.

  17. System design description cone penetrometer system

    SciTech Connect

    Seda, R.Y., Westinghouse Hanford

    1996-08-12

    The system design description documents in detail the design of the cone penetrometer system. The systems includes the cone penetrometer physical package, raman spectroscopy package and moisture sensor package. Information pertinent to the system design, development, fabrication and testing is provided.

  18. Morphology of pyroclastic cones and tectonics

    NASA Astrophysics Data System (ADS)

    Tibaldi, Alessandro

    1995-12-01

    The relationships between morphology and spatial distribution of 1315 Quaternary pyroclastic cones and coeval faulting of the volcanic substrate are analyzed in the following regions with different structural settings: Tepic Rift (Mexico), Ethiopian Rift, Mexican Volcanic Belt, Canary Archipelago, and Mount Etna. Field data and analog experiments of tephra cone emplacement and collapse enable the definition of a number of parameters which can be used to infer the geometry of the fracture feeding the magma to a pyroclastic cone. The strike of the feeding plane is directly related to: (1) the elongation of cone base and crater, (2) the location of depressions on the crater rim, and (3) the alignment of pyroclastic cones in relation to a given vent spacing. In addition, the strike and dip of faults affect the direction of cone breaching. These relationships are valid for volcanic substrate topographic surfaces with an inclination of less than 9° and are especially sensitive to fault escarpment and cone height, lava and cone density, and fault orientation with respect to the dip of the volcanic substrate topography. Relations 1 and 2 become more pronounced for regions undergoing extensional tectonics, where edifices also have a larger dimension. Whereas breaching in the direction of the fault dip is more widespread in regions under extension, breaching along the fault strike as well as the coincidence between fault strike and vent alignment are more frequent in regions with transcurrent or transtensional tectonics.

  19. Targeting gene expression to cones with human cone opsin promoters in recombinant AAV.

    PubMed

    Komáromy, A M; Alexander, J J; Cooper, A E; Chiodo, V A; Glushakova, L G; Acland, G M; Hauswirth, W W; Aguirre, G D

    2008-07-01

    Specific cone-directed therapy is of high priority in the treatment of human hereditary retinal diseases. However, not much information exists about the specific targeting of photoreceptor subclasses. Three versions of the human red cone opsin promoter (PR0.5, 3LCR-PR0.5 and PR2.1), and the human blue cone opsin promoter HB569, were evaluated for their specificity and robustness in targeting green fluorescent protein (GFP) gene expression to subclasses of cones in the canine retina when used in recombinant adeno-associated viral vectors of serotype 5. The vectors were administered by subretinal injection. The promoter PR2.1 led to most effective and specific expression of GFP in the long- and medium-wavelength-absorbing cones (L/M cones) of normal and diseased retinas. The PR0.5 promoter was not effective. Adding three copies of the 35-bp LCR in front of PR0.5 lead to weak GFP expression in L/M cones. The HB569 promoter was not specific, and GFP was expressed in a few L/M cones, some rods and the retinal pigment epithelium. These results suggest that L/M cones, the predominant class of cone photoreceptors in the retinas of dogs and most mammalian species can be successfully targeted using the human red cone opsin promoter.

  20. Power absorbed during whole-body fore-and-aft vibration: Effects of sitting posture, backrest, and footrest

    NASA Astrophysics Data System (ADS)

    Nawayseh, Naser; Griffin, Michael J.

    2012-01-01

    Although the discomfort or injury associated with whole-body vibration cannot be predicted directly from the power absorbed during exposure to vibration, the absorbed power may contribute to understanding of the biodynamics involved in such responses. From measurements of force and acceleration at the seat, the feet, and the backrest, the power absorbed at these three locations was calculated for subjects sitting in four postures (feet hanging, maximum thigh contact, average thigh contact, and minimum thigh contact) both with and without a rigid vertical backrest while exposed to four magnitudes (0.125, 0.25, 0.625, and 1.25 m s -2 rms) of random fore-and-aft vibration. The power absorbed by the body at the supporting seat surface when there was no backrest showed a peak around 1 Hz and another peak between 3 and 4 Hz. Supporting the back with the backrest decreased the power absorbed at the seat at low frequencies but increased the power absorbed at high frequencies. Foot support influenced both the magnitude and the frequency of the peaks in the absorbed power spectra as well as the total absorbed power. The measurements of absorbed power are consistent with backrests being beneficial during exposure to low frequency fore-and-aft vibration but detrimental with high frequency fore-and-aft vibration.

  1. Mechanochemical regulation of growth cone motility

    PubMed Central

    Kerstein, Patrick C.; Nichol, Robert H.; Gomez, Timothy M.

    2015-01-01

    Neuronal growth cones are exquisite sensory-motor machines capable of transducing features contacted in their local extracellular environment into guided process extension during development. Extensive research has shown that chemical ligands activate cell surface receptors on growth cones leading to intracellular signals that direct cytoskeletal changes. However, the environment also provides mechanical support for growth cone adhesion and traction forces that stabilize leading edge protrusions. Interestingly, recent work suggests that both the mechanical properties of the environment and mechanical forces generated within growth cones influence axon guidance. In this review we discuss novel molecular mechanisms involved in growth cone force production and detection, and speculate how these processes may be necessary for the development of proper neuronal morphogenesis. PMID:26217175

  2. Unique characteristics of cones in Central Elysium Planitia, Mars

    NASA Astrophysics Data System (ADS)

    Noguchi, Rina; Kurita, Kei

    2015-06-01

    Martian magmatism within recent several hundreds of millions years is still controversial. Central Elysium Planitia (CEP) is suspected as a site of the latest magmatism on Mars, but hot debates have been caused as for the origin of this flat plain. Cones in CEP are expected to be a key to resolve this controversy. In previous works, there are 2 models proposed for the origin of CEP cones: volcanic rootless cone (e.g. Jaeger et al., 2007) and periglacial pingo (e.g. Burr et al., 2002; Page et al., 2009). In this study, we described detail morphology, distribution and size of CEP cones by using high-resolution images and topographic data. CEP cones are classified into 3 morphological types: Single Cone (SC), Double Cone (DC), and Lotus Fruit Cone (LC). DC has an inner cone in the summit crater of the outer cone, and LC has several inner cones in the summit crater of the outer cone. Several cones have moat structure around the edifice with peripheral rise. DCs and LCs are located in very flat areas of Athabasca Valles in the vicinity of Cerberus Fossae, while SCs distribute in the entire region of CEP. We compared CEP cones with terrestrial rootless cones and pingos in aerial photos. In Lake Myvatn, Iceland, there exist rootless cones which resemble DCs and LCs in CEP. Based on the similarities with terrestrial analogies, we concluded that the most feasible origin of CEP cones is rootless cones.

  3. Teachers' Interpretations of Exit Exam Scores and College Readiness

    ERIC Educational Resources Information Center

    McIntosh, Shelby

    2013-01-01

    This study examined teachers' interpretations of Virginia's high school exit exam policy through the teachers' responses to a survey. The survey was administered to teachers from one school district in Northern Virginia. The teachers selected for the survey taught a subject in which students must pass a Standards of Learning (SOL) test in order to…

  4. State High School Exit Examinations and Postsecondary Labor Market Outcomes

    ERIC Educational Resources Information Center

    Warren, John Robert; Grodsky, Eric; Lee, Jennifer C.

    2008-01-01

    Since the late 1970s, an increasing number of states have required students to pass statewide high school exit examinations (HSEEs) in order to graduate. States have usually adopted HSEEs in response to the perception that a substantial number of graduates lack skills that are required for success in the modern economy. What do these educational…

  5. 34 CFR 682.604 - Required exit counseling for borrowers.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 34 Education 4 2014-07-01 2014-07-01 false Required exit counseling for borrowers. 682.604 Section 682.604 Education Regulations of the Offices of the Department of Education (Continued) OFFICE OF POSTSECONDARY EDUCATION, DEPARTMENT OF EDUCATION (CONTINUED) FEDERAL FAMILY EDUCATION LOAN (FFEL)...

  6. Outcomes of Primary Teacher Education in Finland: An Exit Survey

    ERIC Educational Resources Information Center

    Saloviita, Timo; Tolvanen, Asko

    2017-01-01

    Seven final year cohorts of Finnish pre-service primary teachers (N = 384) were given an exit survey, which measured their estimated attainment of knowledge and experience in the 10 domains of professional activity considered critical for new teachers in the Interstate New Teacher Assessment and Support Consortium (INTASC) standards. The results…

  7. 14 CFR 29.809 - Emergency exit arrangement.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... self-supporting slide or equivalent, and must be designed to meet the following requirements: (1) It... AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT Design and Construction Personnel and Cargo... rotorcraft emergency exit must have an approved slide as stated in paragraph (g) of this section, or...

  8. Control of the mitotic exit network during meiosis.

    PubMed

    Attner, Michelle A; Amon, Angelika

    2012-08-01

    The mitotic exit network (MEN) is an essential GTPase signaling pathway that triggers exit from mitosis in budding yeast. We show here that during meiosis, the MEN is dispensable for exit from meiosis I but contributes to the timely exit from meiosis II. Consistent with a role for the MEN during meiosis II, we find that the signaling pathway is active only during meiosis II. Our analysis further shows that MEN signaling is modulated during meiosis in several key ways. Whereas binding of MEN components to spindle pole bodies (SPBs) is necessary for MEN signaling during mitosis, during meiosis MEN signaling occurs off SPBs and does not require the SPB recruitment factor Nud1. Furthermore, unlike during mitosis, MEN signaling is controlled through the regulated interaction between the MEN kinase Dbf20 and its activating subunit Mob1. Our data lead to the conclusion that a pathway essential for vegetative growth is largely dispensable for the specialized meiotic divisions and provide insights into how cell cycle regulatory pathways are modulated to accommodate different modes of cell division.

  9. 14 CFR 25.809 - Emergency exit arrangement.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... during all lighting conditions with the landing gear extended as well as in all conditions of landing gear collapse. (b) Each emergency exit must be openable from the inside and the outside except that... attitude and in each of the attitudes corresponding to collapse of one or more legs of the landing...

  10. 14 CFR 25.809 - Emergency exit arrangement.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... during all lighting conditions with the landing gear extended as well as in all conditions of landing gear collapse. (b) Each emergency exit must be openable from the inside and the outside except that... attitude and in each of the attitudes corresponding to collapse of one or more legs of the landing...

  11. INTERIOR DETAIL OF THE ARENA EXIT GATE AND VERTICAL LOUVERS ...

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

    INTERIOR DETAIL OF THE ARENA EXIT GATE AND VERTICAL LOUVERS AT THE TOP OF THE BLEACHER SEATING. VIEW FACING NORTHWEST - U.S. Naval Base, Pearl Harbor, Bloch Recreation Center & Arena, Between Center Drive & North Road near Nimitz Gate, Pearl City, Honolulu County, HI

  12. 3. GENERAL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING BARGE AFTER EXITING ...

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

    3. GENERAL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING BARGE AFTER EXITING FROM DOWNSTREAM END OF NAVIGATION LOCK #1; SWING BRIDGE IS IN PROCESS OF CLOSING. - Bonneville Project, Navigation Lock No. 1, Oregon shore of Columbia River near first Powerhouse, Bonneville, Multnomah County, OR

  13. ARROYO SECO PARKWAY SOUTHBOUND LANES AND EXIT RAMP TO ORANGE ...

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

    ARROYO SECO PARKWAY SOUTHBOUND LANES AND EXIT RAMP TO ORANGE GROVE AVENUE. ORANGE GROVE AVENUE BRIDGE IN REAR. NOTE IRRIGATION AND DRAINAGE FEATURES AT RIGHT. LOOKING 248°WSW - Arroyo Seco Parkway, Orange Grove Avenue Bridge, Milepost 30.59, Los Angeles, Los Angeles County, CA

  14. 10 CFR 431.202 - Definitions concerning illuminated exit signs.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 10 Energy 3 2013-01-01 2013-01-01 false Definitions concerning illuminated exit signs. 431.202 Section 431.202 Energy DEPARTMENT OF ENERGY ENERGY CONSERVATION ENERGY EFFICIENCY PROGRAM FOR CERTAIN... one manufacturer, having the same primary energy source, and which have essentially...

  15. 10 CFR 431.202 - Definitions concerning illuminated exit signs.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 3 2014-01-01 2014-01-01 false Definitions concerning illuminated exit signs. 431.202 Section 431.202 Energy DEPARTMENT OF ENERGY ENERGY CONSERVATION ENERGY EFFICIENCY PROGRAM FOR CERTAIN... one manufacturer, having the same primary energy source, and which have essentially...

  16. 10 CFR 431.202 - Definitions concerning illuminated exit signs.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 3 2012-01-01 2012-01-01 false Definitions concerning illuminated exit signs. 431.202 Section 431.202 Energy DEPARTMENT OF ENERGY ENERGY CONSERVATION ENERGY EFFICIENCY PROGRAM FOR CERTAIN... one manufacturer, having the same primary energy source, and which have essentially...

  17. View looking out of the Irving Powerhouse showing the exiting ...

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

    View looking out of the Irving Powerhouse showing the exiting water flowing south into the inlet of the Childs System. Looking south - Childs-Irving Hydroelectric Project, Irving System, Irving Powerhouse, Forest Service Road 708/502, Camp Verde, Yavapai County, AZ

  18. 14 CFR 23.811 - Emergency exit marking.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... inches high, be self-illuminated or independently, internally electrically illuminated, and have a... means of opening, must be conspicuously marked; (2) The identity and location of each emergency exit...— (i) Be self-illuminated with an initial brightness of at least 160 microlamberts; or (ii)...

  19. 14 CFR 23.811 - Emergency exit marking.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... inches high, be self-illuminated or independently, internally electrically illuminated, and have a... means of opening, must be conspicuously marked; (2) The identity and location of each emergency exit...— (i) Be self-illuminated with an initial brightness of at least 160 microlamberts; or (ii)...

  20. 14 CFR 23.811 - Emergency exit marking.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... inches high, be self-illuminated or independently, internally electrically illuminated, and have a... means of opening, must be conspicuously marked; (2) The identity and location of each emergency exit...— (i) Be self-illuminated with an initial brightness of at least 160 microlamberts; or (ii)...

  1. Modeling States' Enactment of High School Exit Examination Policies

    ERIC Educational Resources Information Center

    Warren, John Robert; Kulick, Rachael B.

    2007-01-01

    We present five frameworks for explaining which U.S. states adopted high school exit examination policies at particular points in time. The frameworks correspond to issues of academic achievement, education spending, economic conditions, racial/ethnic heterogeneity and policy diffusion. Using event history techniques we find that states with…

  2. CA State Profile. California: California High School Exit Examination (CAHSEE)

    ERIC Educational Resources Information Center

    Center on Education Policy, 2010

    2010-01-01

    This paper provides information about California High School Exit Examination, a comprehensive standards-based exam. The purpose of the exam is to: (1) Determine prospective high school graduates' knowledge and skill levels relative to those needed for entry-level employment; (2) Determine prospective high school graduates' mastery of the state…

  3. LA State Profile. Louisiana: Graduation Exit Examination (GEE)

    ERIC Educational Resources Information Center

    Center on Education Policy, 2010

    2010-01-01

    This paper provides information about Louisiana's Graduation Exit Examination, a comprehensive standards-based exam. The purpose of the exam is to: (1) Provide schools with student academic diagnostic information; (2) Determine prospective high school graduates' mastery of the state curriculum; (3) Encourage districts and schools to identify and…

  4. Demonstration of short-haul aircraft aft noise reduction techniques on a twenty inch (50.8 cm) diameter fan, volume 1

    NASA Technical Reports Server (NTRS)

    Stimpert, D. L.; Mcfalls, R. A.

    1975-01-01

    Tests of a 20 inch diameter, low tip speed, low pressure ratio fan which investigated aft fan noise reduction techniques are reported. These techniques included source noise reduction features of selection of vane-blade ratio to reduce second harmonic noise, spacing effects, and lowering the Mach number through a vane row. Aft suppression features investigated included porosity effects, variable depth treatment, and treatment regenerated flow noise. Initial results and selected comparisons are presented.

  5. Proton exit channels in bovine cytochrome c oxidase.

    PubMed

    Popović, Dragan M; Stuchebrukhov, Alexei A

    2005-02-10

    Cytochrome c oxidase (CcO) is the terminal transmembrane enzyme of the respiratory electron transport chain in aerobic cells. It catalyzes the reduction of oxygen to water and utilizes the free energy of the reduction reaction for proton pumping, a process which results in a membrane electrochemical proton gradient. Although the structure of the enzyme has been solved for several organisms, the molecular mechanism of proton pumping and proton exit pathways remain unknown. In our previous work, the continuum electrostatic calculations were employed to evaluate the electrostatic potential, energies, and protonation state of bovine cytochrome c oxidase for different redox states of the enzyme. A possible mechanism of oxygen reduction and proton pumping via His291 was proposed. In this paper, using electrostatic calculations, we examine the proton exit pathways in the enzyme. By monitoring the changes of the protonation states, proton affinities, and energies of electrostatic interactions between the titratable groups in different redox states of CcO, we identified the clusters of strongly interacting residues. Using these data, we detected four possible proton exit points on the periplasmic side of the membrane (Lys171B/Asp173B, His24B/Asp25B, Asp51, and Asp300). We then were able to trace the proton exit pathways and to evaluate the energy profiles along the paths. On the basis of energetic considerations and the conservation of the residues in a protein sequence, the most likely exit pathway is one via the Lys171B/Asp173B site. The obtained results are fully consistent with our His291 model of proton pumping, and provide a rationale for the absence of proton leaking in CcO between the pumping strokes.

  6. Comparability of Semester and Exit Exam Grades: Long-Term Effect of the Implementation of State-Wide Exit Exams

    ERIC Educational Resources Information Center

    Maag Merki, Katharina; Holmeier, Monika

    2015-01-01

    A goal in many countries is to institute state-wide exams to base student assessment more firmly on norms for all classes. This raises the question as to the extent to which greater standardization of grading practice can be reached by implementing state-wide exit exams. Since there is a lack of longitudinal studies, we analyzed the effect of the…

  7. Evaluation of 7XXX-series aluminum alloys for the W87 aft support ring

    SciTech Connect

    Mahin, K.W.

    1985-03-01

    The study showed that the tensile properties of both 7075-T6 and 7050-T73651 decreased significantly after holding the alloys for any length of time at temperatures greater than 500/sup 0/F. After a 2-min hold at 575/sup 0/F, the yield strengths of 7075-T6 and 7050-T73651 were 217 MPa (31.5 ksi) and 245 MPa (35.6 ksi), respectively. There did not appear to be a significant difference in the mechanical properties between 7075-T6 and 7050-T6. Time at temperature appeared to be a critical parameter. Cycling the microstructure to 575/sup 0/F or above with no hold at temperature caused considerably less degradation in mechanical properties than a 2-min hold at temperature in all cases. Above 650/sup 0/F, both the ultimate tensile strength and the yield strength of the alloys reached a minimum of around 310 MPa (45 ksi) and 138 MPa (20 ksi), respectively. Evidence of a continuous grain boundary film of eta phase precipitates was found in the 7075-T6 alloy after a typical 575/sup 0/F thermal cycle. The presence of this grain boundary precipitate indicated a potential sensitivity of this alloy to stress corrosion cracking. Although the general environment for the aft support ring is controlled, the ring is expected to be under tension after assembly and exposure to small amounts of water vapor will probably occur. The conditions of stress, moisture, and susceptible microstructure increase the likelihood of stress corrosion cracking.

  8. S-IV-B Aft Swing Arm Cam Lever Stop Strain Guage

    NASA Technical Reports Server (NTRS)

    1967-01-01

    The Marshall Space Flight Center (MSFC) played a crucial role in the development of the huge Saturn rockets that delivered humans to the moon in the 1960s. Many unique facilities existed at MSFC for the development and testing of the Saturn rockets. Affectionately nicknamed 'The Arm Farm', the Random Motion/ Lift-Off Simulator was one of those unique facilities. This facility was developed to test the swing arm mechanisms that were used to hold the rocket in position until liftoff. The Arm Farm provided the capability of testing the detachment and reconnection of various arms under brutally realistic conditions. The 18-acre facility consisted of more than a half dozen arm test positions and one position for testing access arms used by the Apollo astronauts. Each test position had two elements: a vehicle simulator for duplicating motions during countdown and launch; and a section duplicating the launch tower. The vehicle simulator duplicated the portion of the vehicle skin that contained the umbilical connections and personnel access hatches. Driven by a hydraulic servo system, the vehicle simulator produced relative motion between the vehicle and tower. On the Arm Farm, extreme environmental conditions (such as a launch scrub during an approaching Florida thunderstorm) could be simulated. The dramatic scenes that the Marshall engineers and technicians created at the Arm Farm permitted the gathering of crucial technical and engineering data to ensure a successful real time launch from the Kennedy Space Center. This photo depicts a close up of the S-IV-B aft swing arm cam lever stop strain guage.

  9. Simultaneous measurement of smoothened entry into and exit from the primary cilium.

    PubMed

    Kim, Jynho; Hsia, Elaine Y C; Kim, James; Sever, Navdar; Beachy, Philip A; Zheng, Xiaoyan

    2014-01-01

    Ciliary accumulation of signaling proteins must result from a rate of ciliary entry that exceeds ciliary exit, but approaches for distinguishing ciliary entry vs. exit are lacking. Using a photoconvertible fluorescent protein tag, we establish an assay that allows a separate but simultaneous examination of ciliary entry and exit of the Hedgehog signaling protein Smoothened in individual cells. We show that KAAD-cyclopamine selectively blocks entry, whereas ciliobrevin interferes initially with exit and eventually with both entry and exit of ciliary Smoothened. Our study provides an approach to understanding regulation of ciliary entry vs. exit of Hedgehog signaling components as well as other ciliary proteins.

  10. Elastomeric Microchip Electrospray Emitter for Stable Cone-Jet Mode Operation in the Nanoflow Regime.

    SciTech Connect

    Kelly, Ryan T.; Tang, Keqi; Irimia, Daniel; Toner, Mehmet; Smith, Richard D.

    2008-05-15

    Despite widespread interest in applying lab-on-a-chip technologies to mass spectrometry (MS)-based analyses, the coupling of microfluidics to electrospray ionization (ESI)-MS remains challenging. We report a robust, integrated poly(dimethylsiloxane) microchip interface for ESI-MS using simple and widely accessible microfabrication procedures. The interface uses an auxiliary channel to provide electrical contact in the Taylor cone of the electrospray without sample loss or dilution. The electric field at the channel terminus is enhanced by two vertical cuts that cause the interface to taper to a line rather than to a point, and the formation of small Taylor cones at the channel exit ensures sub-nL post-column dead volumes. While comparable ESI-MS sensitivities were achieved using both microchip and conventional fused silica capillary emitters, stable cone-jet mode electrospray could be established over a far broader range of flow rates (from 50–1000 nL/min) and applied potentials using the microchip emitters. This special feature of the microchip emitter should minimize the fine tuning required for electrospray optimization and make the stable electrospray more resistant to external perturbations.

  11. Quality control and patient dosimetry in dental cone beam CT.

    PubMed

    Vassileva, J; Stoyanov, D

    2010-01-01

    This paper presents the initial experience in performing quality control and patient dose measurements in a cone beam computed tomography (CT) scanner (ILUMA Ultra, IMTEC Imaging, USA) for oral and maxillofacial radiology. The X-ray tube and the generator were tested first, including the kVp accuracy and precision, and the half-value layer (HVL). The following tests specific for panoramic dental systems were also performed: tube output, beam size and beam alignment to the detector. The tests specific for CT included measurements of noise and CT numbers in water and in air, as well as the homogeneity of CT numbers. The most appropriate dose quantity was found to be the air kerma-area product (KAP) measured with a KAP-metre installed at the tube exit. KAP values were found to vary from 110 to 185 microGy m(2) for available adult protocols and to be 54 microGy m(2) for the paediatric protocol. The effective dose calculated with the software PCXMC (STUK, Finland) was 0.05 mSv for children and 0.09-0.16 mSv for adults.

  12. Modal content of living human cone photoreceptors

    PubMed Central

    Liu, Zhuolin; Kocaoglu, Omer P.; Turner, Timothy L.; Miller, Donald T.

    2015-01-01

    Decades of experimental and theoretical investigations have established that photoreceptors capture light based on the principles of optical waveguiding. Yet considerable uncertainty remains, even for the most basic prediction as to whether photoreceptors support more than a single waveguide mode. To test for modal behavior in human cone photoreceptors in the near infrared, we took advantage of adaptive-optics optical coherence tomography (AO-OCT, λc = 785 nm) to noninvasively image in three dimensions the reflectance profile of cones. Modal content of reflections generated at the cone inner segment and outer segment junction (IS/OS) and cone outer segment tip (COST) was examined over a range of cone diameters in 1,802 cones from 0.6° to 10° retinal eccentricity. Second moment analysis in conjunction with theoretical predictions indicate cone IS and OS have optical properties consistent of waveguides, which depend on segment diameter and refractive index. Cone IS was found to support a single mode near the fovea (≤3°) and multiple modes further away (>4°). In contrast, no evidence of multiple modes was found in the cone OSs. The IS/OS and COST reflections share a common optical aperture, are most circular near the fovea, show no orientation preference, and are temporally stable. We tested mode predictions of a conventional step-index fiber model and found that in order to fit our AO-OCT results required a lower estimate of the IS refractive index and introduction of an IS focusing/tapering effect. PMID:26417509

  13. The Cone-specific Visual Cycle

    PubMed Central

    Wang, Jin-Shan; Kefalov, Vladimir J

    2010-01-01

    Cone photoreceptors mediate our daytime vision and function under bright and rapidly-changing light conditions. As their visual pigment is destroyed in the process of photoactivation, the continuous function of cones imposes the need for rapid recycling of their chromophore and regeneration of their pigment. The canonical retinoid visual cycle through the retinal pigment epithelium cells recycles chromophore and supplies it to both rods and cones. However, shortcomings of this pathway, including its slow rate and competition with rods for chromophore, have led to the suggestion that cones might use a separate mechanism for recycling of chromophore. In the past four decades biochemical studies have identified enzymatic activities consistent with recycling chromophore in the retinas of cone-dominant animals, such as chicken and ground squirrel. These studies have led to the hypothesis of a cone-specific retina visual cycle. The physiological relevance of these studies was controversial for a long time and evidence for the function of this visual cycle emerged only in very recent studies and will be the focus of this review. The retina visual cycle supplies chromophore and promotes pigment regeneration only in cones but not in rods. This pathway is independent of the pigment epithelium and instead involves the Müller cells in the retina, where chromophore is recycled and supplied selectively to cones. The rapid supply of chromophore through the retina visual cycle is critical for extending the dynamic range of cones to bright light and for their rapid dark adaptation following exposure to light. The importance of the retina visual cycle is emphasized also by its preservation through evolution as its function has now been demonstrated in species ranging from salamander to zebrafish, mouse, primate, and human. PMID:21111842

  14. A reflection mechanism for aft fan tone noise from turbofan engines

    NASA Astrophysics Data System (ADS)

    Topol, D. A.; Holhubner, S. C.; Mathews, D. C.

    1987-10-01

    A fan tone noise mechanism is proposed which results from reflections from the fan of forward propagating rotor wake/fan exit guide vane interaction tone noise. These fan noise tones are often more dominant out of the rear than out of the front of an engine. To simulate this effect a simple qualitative prediction model was formulated and a scaled model test program was conducted. Results from each of these investigations are compared with each other and with full-scale engine data. These comparisons substantiate the potential importance of this mechanism. Further support is provided by mode measurement data from full-scale testing. This study concluded that for certain vane/blade ratios and tip Mach numbers the contribution of the reflection noise mechanism is significant.

  15. Full Scale Wind Tunnel and Seaplane Tow Channel

    NASA Technical Reports Server (NTRS)

    1930-01-01

    Construction progress, Full Scale exit cone looking south from entrance cone, east switchboard, west switchboard, wind vanes at north end looking north through entrance cone, north end looking south through entrance cone, entrance cone looking north from exit cone, wind vanes south end of west exit cone, wind vanes south end of east exit cone, Tow Channel trolley lines looking north, east and west incline braces at north end. Full-Scale Tunnel (FST) exit cone construction and installation of fan motors. Smith DeFrance describes the entrance cone in NACA TR 459 as follows: 'Forward of the propellers and located on the center line of the tunnel is a smooth fairing which transforms the somewhat elliptic section of the single passage into two circular ones at the propellers. From the propellers aft, the exit cone is divided into two passages and each transforms in the length of 132 feet from a 35-foot 61/2-inch circular section to a 46-foot square. The included angle between the sides of each passage is 6 inches.' (p. 293)

  16. Anisotropy of thermal infrared exitance in sunflower canopies

    NASA Technical Reports Server (NTRS)

    Tha Paw u, Kyaw; Ustin, Susan L.; Zhang, Chang-An

    1989-01-01

    Anisotropy of thermal infrared exitance above and within a relatively closed fully irrigated sunflower canopy is detailed. Azimuthal variation in thermal infrared exitance above canopies was weakly (statistically) related to solar position and was comparable to or larger than errors in satellite-based canopy estimates. Anisotropy within canopies was significantly lower and decreased with canopy closure and depth into the canopy. Measured azimuthal isotropy within canopies supports the use of this assumption in radiative transfer models. Significant differences in canopy temperature measurements were found depending upon whether the instruments were within or above the canopy. These differences could produce errors of 20-35 percent in latent energy estimates during periods of high evapotranspiration (ET) and greater errors in periods of restricted ET.

  17. EXIT procedure: a report of the first three Mississippi cases.

    PubMed

    Brewer, Justin; Liechty, Kenneth W; Bofill, James A

    2012-04-01

    The University of Mississippi Medical Center has initiated a state-of-the-art fetal center. This project involves collaboration between multiple disciplines including anesthesiology, pediatric surgery, maternal-fetal medicine, radiology, neonatology, genetics, pediatric cardiology and other pediatric subspecialties, nursing, and social work. Complicated fetal patients from throughout the southeastern U.S.A. may be referred to this center and benefit from new and innovative interventions that have not been available to this region in the past. The first three EXIT (ex-utero intrapartum treatment) procedures were recently performed at Batson Children's Hospital at the University of Mississippi Medical Center. Our objective is to share our recent experiences with this novel procedure and to detail some of the basics of an EXIT delivery.

  18. The exit-time problem for a Markov jump process

    SciTech Connect

    Burch, N.; D'Elia, Marta; Lehoucq, Richard B.

    2014-12-15

    The purpose of our paper is to consider the exit-time problem for a finite-range Markov jump process, i.e, the distance the particle can jump is bounded independent of its location. Such jump diffusions are expedient models for anomalous transport exhibiting super-diffusion or nonstandard normal diffusion. We refer to the associated deterministic equation as a volume-constrained nonlocal diffusion equation. The volume constraint is the nonlocal analogue of a boundary condition necessary to demonstrate that the nonlocal diffusion equation is well-posed and is consistent with the jump process. A critical aspect of the analysis is a variational formulation and a recently developed nonlocal vector calculus. Furthermore, this calculus allows us to pose nonlocal backward and forward Kolmogorov equations, the former equation granting the various moments of the exit-time distribution.

  19. Simulation of stochastic diffusion via first exit times

    SciTech Connect

    Lötstedt, Per Meinecke, Lina

    2015-11-01

    In molecular biology it is of interest to simulate diffusion stochastically. In the mesoscopic model we partition a biological cell into unstructured subvolumes. In each subvolume the number of molecules is recorded at each time step and molecules can jump between neighboring subvolumes to model diffusion. The jump rates can be computed by discretizing the diffusion equation on that unstructured mesh. If the mesh is of poor quality, due to a complicated cell geometry, standard discretization methods can generate negative jump coefficients, which no longer allows the interpretation as the probability to jump between the subvolumes. We propose a method based on the mean first exit time of a molecule from a subvolume, which guarantees positive jump coefficients. Two approaches to exit times, a global and a local one, are presented and tested in simulations on meshes of different quality in two and three dimensions.

  20. Simulation of stochastic diffusion via first exit times

    PubMed Central

    Lötstedt, Per; Meinecke, Lina

    2015-01-01

    In molecular biology it is of interest to simulate diffusion stochastically. In the mesoscopic model we partition a biological cell into unstructured subvolumes. In each subvolume the number of molecules is recorded at each time step and molecules can jump between neighboring subvolumes to model diffusion. The jump rates can be computed by discretizing the diffusion equation on that unstructured mesh. If the mesh is of poor quality, due to a complicated cell geometry, standard discretization methods can generate negative jump coefficients, which no longer allows the interpretation as the probability to jump between the subvolumes. We propose a method based on the mean first exit time of a molecule from a subvolume, which guarantees positive jump coefficients. Two approaches to exit times, a global and a local one, are presented and tested in simulations on meshes of different quality in two and three dimensions. PMID:26600600

  1. Limit of small exits in open Hamiltonian systems.

    PubMed

    Aguirre, Jacobo; Sanjuán, Miguel A F

    2003-05-01

    The nature of open Hamiltonian systems is analyzed, when the size of the exits decreases and tends to zero. Fractal basins appear typically in open Hamiltonian systems, but we claim that in the limit of small exits, the invariant sets tend to fill up the whole phase space with the strong consequence that a new kind of basin appears, where the unpredictability grows indefinitely. This means that for finite, arbitrarily small accuracy, we can find uncertain basins, where any information about the future of the system is lost. This total indeterminism had only been reported in dissipative systems, in particular in the so-called intermingled riddled basins, as well as in the riddledlike basins. We show that this peculiar, behavior is a general feature of open Hamiltonian systems.

  2. Batch and dynamic biosorption of basic dyes from binary solutions by alkaline-treated cypress cone chips.

    PubMed

    Fernandez, M E; Nunell, G V; Bonelli, P R; Cukierman, A L

    2012-02-01

    A simple alkaline pre-treatment of Cupressus sempervirens cone chips was performed to improve their biosorption capacity towards methylene blue and rhodamine B from aqueous solutions, in batch and continuous modes. Biosorption kinetics were determined from single and binary dyes solutions, and properly described by the pseudo-second-order rate model. Experimental single-dye equilibrium isotherms fitted the Langmuir-Freundlich model, with maximum biosorption capacities of 0.68mmol/g for methylene blue and 0.50mmol/g for rhodamine B. Single-dye dynamic biosorption showed that breakthrough time for methylene blue biosorption was almost four times longer than for rhodamine B and that the alkaline modification of the chips greatly improved the biosorption performance. Competitive dynamic biosorption demonstrated the preference of the modified cone chips for biosorbing methylene blue, confirmed by the exit concentration overshoots obtained in the breakthrough curves of rhodamine B.

  3. Mitotic exit: Determining the PP2A dephosphorylation program.

    PubMed

    Pereira, Gislene; Schiebel, Elmar

    2016-08-29

    In mitotic exit, proteins that were highly phosphorylated are sequentially targeted by the phosphatase PP2A-B55, but what underlies substrate selection is unclear. In this issue, Cundell et al. (2016. J. Cell Biol http://dx.doi.org/10.1083/jcb.201606033) identify the determinants of PP2A-B55's dephosphorylation program, thereby influencing spindle disassembly, nuclear envelope reformation, and cytokinesis.

  4. Mitotic exit: Determining the PP2A dephosphorylation program

    PubMed Central

    2016-01-01

    In mitotic exit, proteins that were highly phosphorylated are sequentially targeted by the phosphatase PP2A-B55, but what underlies substrate selection is unclear. In this issue, Cundell et al. (2016. J. Cell Biol. http://dx.doi.org/10.1083/jcb.201606033) identify the determinants of PP2A-B55’s dephosphorylation program, thereby influencing spindle disassembly, nuclear envelope reformation, and cytokinesis. PMID:27551057

  5. Crew of STS 41-D mission exit orbiter after landing

    NASA Technical Reports Server (NTRS)

    1984-01-01

    The crew of the STS 41-D mission exit the orbiter after landing at Edwards Air Force Base in California. Starting at the top of the ladder is Astronaut Charles D. Walker, payload specialist; Judith A. Resnik, mission specialist; Steven A. Hawley, mission specialist; and Richard M. Mike Mullane, mission specialist. Waiting at the bottom of the ramp are Astronaut Mike Coats (left), pilot and Henry W. Hartsfield, Jr. (center), crew commander.

  6. 30. VIEW OF ROOM 212 LOOKING SOUTHEAST TOWARDS EXIT DOORS. ...

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

    30. VIEW OF ROOM 212 LOOKING SOUTHEAST TOWARDS EXIT DOORS. EXPOSED MASONRY WALL WITH BRICK DETAILING OVER ARCHED DOORWAY IS UNPAINTED. ORIGINAL USE OF ROOM 212 WAS AS A HAYLOFT; EXTERIOR DOOR WAS USED FOR LOADING HAY. TRUSSWORK AND BEAMS ARE EXPOSED AND UNPAINTED. WALLS HAVE PAINTED WOOD PANELING, CEILING MATERIAL IS EXPOSED WOOD ROOF SHEATHING. - Presidio of San Francisco, Cavalry Stables, Cowles Street, between Lincoln Boulevard & McDowell Street, San Francisco, San Francisco County, CA

  7. Graceful exit via polymerization of pre-big-bang cosmology

    SciTech Connect

    De Risi, Giuseppe; Maartens, Roy; Singh, Parampreet

    2007-11-15

    We consider a phenomenological modification of the pre-big-bang scenario using ideas from the resolution of curvature singularities in loop quantum cosmology. We show that nonperturbative loop modifications to the dynamics, arising from the underlying polymer representation, can resolve the graceful exit problem. The curvature and the dilaton energy stay finite at all times, in both the string and Einstein frames. In the string frame, the dilaton tends to a constant value at late times after the bounce.

  8. The EXIT for Prenatally Diagnosed Cervical Cystic Teratoma: A Case Report.

    PubMed

    Cansaran, Sabri; Cerrah Celayir, Ayşenur; Moralıoğlu, Serdar; Ayvacı, Habibe; Tuğrul, Semih; Ovalı, Fahri; Çetiner, Handan

    2015-01-01

    The Ex-utero intrapartum treatment (EXIT) is a procedure performed during caesarean section while on fetal-placental circulation. We present a prenatally diagnosed cervical cystic mass causing tracheal compression which was managed successfully with the EXIT procedure.

  9. 29 CFR 1910.35 - Compliance with alternate exit-route codes.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ..., DEPARTMENT OF LABOR OCCUPATIONAL SAFETY AND HEALTH STANDARDS Exit Routes and Emergency Planning § 1910.35...-route provisions of NFPA 101, Life Safety Code, 2009 edition, or the exit-route provisions of...

  10. 29 CFR 1910.35 - Compliance with alternate exit-route codes.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ..., DEPARTMENT OF LABOR OCCUPATIONAL SAFETY AND HEALTH STANDARDS Exit Routes and Emergency Planning § 1910.35...-route provisions of NFPA 101, Life Safety Code, 2009 edition, or the exit-route provisions of...

  11. Discrete element crowd model for pedestrian evacuation through an exit

    NASA Astrophysics Data System (ADS)

    Peng, Lin; Jian, Ma; Siuming, Lo

    2016-03-01

    A series of accidents caused by crowds within the last decades evoked a lot of scientific interest in modeling the movement of pedestrian crowds. Based on the discrete element method, a granular dynamic model, in which the human body is simplified as a self-driven sphere, is proposed to simulate the characteristics of crowd flow through an exit. In this model, the repulsive force among people is considered to have an anisotropic feature, and the physical contact force due to body deformation is quantified by the Hertz contact model. The movement of the human body is simulated by applying the second Newton’s law. The crowd flow through an exit at different desired velocities is studied and simulation results indicated that crowd flow exhibits three distinct states, i.e., smooth state, transition state and phase separation state. In the simulation, the clogging phenomenon occurs more easily when the desired velocity is high and the exit may as a result be totally blocked at a desired velocity of 1.6 m/s or above, leading to faster-to-frozen effect. Project supported by the National Natural Science Foundation of China (Grant Nos. 71473207, 51178445, and 71103148), the Research Grant Council, Government of Hong Kong, China (Grant No. CityU119011), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2682014CX103 and 2682014RC05).

  12. PKCɛ switches Aurora B specificity to exit the abscission checkpoint

    PubMed Central

    Pike, Tanya; Brownlow, Nicola; Kjaer, Svend; Carlton, Jeremy; Parker, Peter J.

    2016-01-01

    The ‘NoCut', or Aurora B abscission checkpoint can be activated if DNA is retained in the cleavage furrow after completion of anaphase. Checkpoint failure leads to incomplete abscission and a binucleate outcome. These phenotypes are also observed after loss of PKCɛ in transformed cell models. Here we show that PKCɛ directly modulates the Aurora B-dependent abscission checkpoint by phosphorylating Aurora B at S227. This phosphorylation invokes a switch in Aurora B specificity, with increased phosphorylation of a subset of target substrates, including the CPC subunit Borealin. This switch is essential for abscission checkpoint exit. Preventing the phosphorylation of Borealin leads to abscission failure, as does expression of a non-phosphorylatable Aurora B S227A mutant. Further, depletion of the ESCRT-III component and Aurora B substrate CHMP4C enables abscission, bypassing the PKCɛ–Aurora B exit pathway. Thus, we demonstrate that PKCɛ signals through Aurora B to exit the abscission checkpoint and complete cell division. PMID:28004745

  13. Modeling of Fixed-Exit Porous Bleed Systems

    NASA Technical Reports Server (NTRS)

    Slater, John W.; Saunders, John D.

    2008-01-01

    A model has been developed to simulate a fixed-exit porous bleed system for supersonic inlets. The fixed-exit model allows the amount of bleed flow to vary according to local flow conditions and fixed-exit characteristics of the bleed system. This variation is important for the control of shock-wave/boundary-layer interactions within the inlet. The model computes the bleed plenum static pressure rather than requiring its specification. The model was implemented in the Wind-US computational fluid dynamics code. The model was then verified and validated against experimental data for bleed on a flat plate with and without an impinging oblique shock and for bleed in a Mach 3.0 axisymmetric, mixed-compression inlet. The model was able to accurately correlate the plenum pressures with bleed rates and simulate the effect of the bleed on the downstream boundary layer. Further, the model provided a realistic simulation of the initiation of inlet unstart. The results provide the most in-depth examination to date of bleed models for use in the simulation of supersonic inlets. The results also highlight the limitations of the models and aspects that require further research.

  14. PKCɛ switches Aurora B specificity to exit the abscission checkpoint.

    PubMed

    Pike, Tanya; Brownlow, Nicola; Kjaer, Svend; Carlton, Jeremy; Parker, Peter J

    2016-12-22

    The 'NoCut', or Aurora B abscission checkpoint can be activated if DNA is retained in the cleavage furrow after completion of anaphase. Checkpoint failure leads to incomplete abscission and a binucleate outcome. These phenotypes are also observed after loss of PKCɛ in transformed cell models. Here we show that PKCɛ directly modulates the Aurora B-dependent abscission checkpoint by phosphorylating Aurora B at S227. This phosphorylation invokes a switch in Aurora B specificity, with increased phosphorylation of a subset of target substrates, including the CPC subunit Borealin. This switch is essential for abscission checkpoint exit. Preventing the phosphorylation of Borealin leads to abscission failure, as does expression of a non-phosphorylatable Aurora B S227A mutant. Further, depletion of the ESCRT-III component and Aurora B substrate CHMP4C enables abscission, bypassing the PKCɛ-Aurora B exit pathway. Thus, we demonstrate that PKCɛ signals through Aurora B to exit the abscission checkpoint and complete cell division.

  15. Cone Quasi-Concave Multi-Objective Programming Theory and Dominance Cone Constructions.

    DTIC Science & Technology

    1988-08-01

    4 Cone Quasi-Concave Multi-Objective Prog ramm in(I Theory and Dominance Cone Constructions by A. Chames Z. M. Huang J. J. Rousseau 0. B. Sun 0. L...Report 606 Cone Quasi-Concave Multi-Objective Programming: Theory and Dominance Cone Constructions by A. Chames Z. M. Huang J. J. Rousseau D. B. Sun...permitted for any purpose of the U.S. Govemement. Tr% C CENTER FOR CYBERNETIC STUDIES cV- A. Chames , Director V 3 D 1 College of Business Administration

  16. Homologies among Coniferophyte cones: further observations

    NASA Astrophysics Data System (ADS)

    Grauvogel-Stamm, Léa; Galtier, Jean

    1998-04-01

    A reinvestigation of the Triassic conifer pollen cone of Darneya shows evidence that clusters of pollen sacs are attached (adnate), at regular intervals, to the upper side of the stalk and that the distribution of stomata is restricted to the apical part of the abaxial side of the peltate scale. These features and others, such as the commissure visible on the stalk and the scale, suggest a dual nature of the male scale complex of Darneya which therefore is interpreted as an abaxial bract fused with an adaxial fertile shoot bearing several clusters of pollen sacs. This conifer pollen cone is thus considered as a compound strobilus (inflorescence) homologous with the female cone of the conifers and therefore with the cones, both male and female, of the cordaites.

  17. Exploring the topographic evolution of cinder cones

    NASA Astrophysics Data System (ADS)

    Arrowsmith, R.; Zibart, S.; Gleeman, E.; Alfano, F.; Clarke, A. B.; De'Michieli Vitturi, M.; Dekko, R.

    2013-12-01

    The simple original form and monogenetic character of cinder cones make them interesting targets for the study of landscape evolution. Topographic metrics such as cone height-width ratios and histograms of topographic slope yield useful and portable characterizations of cinder cone relative ages. We explored the topographic evolution of cinder cones by simulating surface processes using numerical and physical experimentation approaches and by collecting high resolution topography over exemplary elements of the San Francisco Volcanic field in northern Arizona. We identified a clear distinction in cone form development between those composed of transport-limited cinder only and those with a capping hard agglutinated rim. We employed a fully 2 dimensional numerical implementation of non linear diffusion with spatially variable transport rates. The agglutinate was idealized as an annulus of diminished transport rate. In the laboratory, we used a simple erosion model consisting of fine mist over a cone of fine sand. The agglutinate was represented with a spray adhesive cap. Non-agglutinated cones show a steady decrease in height and increase in width over time, resulting in a lower height-to-width ratios and greater rounding of profiles than agglutinated cones. The presence of an agglutinate top lessens the degree of rounding, producing a concave profile with a resistant 'neck' as the cone flank erodes, in contrast with non-agglutinated cones which develop into convex-concave profiles. The resistant agglutinate protects itself and the material directly underneath it from erosion; this material stays in place while the sediments around it are transported downslope. The slope distributions start out as bimodal: flat and angle of repose. In the non-agglutinated case, the rounding of the cone and broadening of the base produces a more continuous slope distribution with overall progressive slope decrease from the angle of repose and slope increase from the flat base. The

  18. DEFORMATION OF SCORIA CONE BY CONDUIT PRESSURIZATION

    SciTech Connect

    E.S. Gaffney; B. Damjanac; D. Krier; G. Valentine

    2005-08-26

    A simplified mechanical model is used to simulate the deformation of a scoria cone due to pressurization of magma in a feeder conduit. The scoria cone is modeled as consisting of a cone of stabilized scoria with an axial region of loose scoria (height h{sub 1}), all overlying a vertically oriented cylindrical conduit intruded into rhyolite tuff country rock. For our analyses, the conduit is filled with basalt magma, usually with the upper length (h{sub 2}) solidified. The style of deformation of the cone depends on both h{sub 1} and h{sub 2}. If magma is prevented from hydrofracturing out of the conduit (as, for example, might be the case if the magma is surrounded by a solidified, but plastically deformable layer acting as a gasket backed up by the brittle country rock) pressures in the magma can build to 10s of MPa. When h{sub 1} is 100 m, not unusual for a small isolated basaltic cinder cone, the magma pressure needed to destabilize the cone when molten magma extends all the way to the original ground surface (h{sub 2} = 0) is only about one-third of the pressure when the upper part of the conduit is solidified (h{sub 2} = 25m). In the former case, almost the entire upper third of the cone is at failure in tension when the configuration becomes unstable. In the latter case, small portions of the surface of the cone are failing in tension when instability occurs, but a large volume in the central core of the cone is failing in shear or compressions. These results may provide insight into the status of volcanic plumbing, either past or present, beneath scoria cones. Field observations at the Lathrop Wells volcano in southern Nevada identify structures at the outer edge just below the crater rim that appear to be inward-dipping listric normal faults. This may indicate that, near the end of its active stage, the cone was close to failing in this fashion. A companion paper suggests that such a failure could have been quite energetic had it occurred.

  19. Tantalum Cones in Revision Total Knee Arthroplasty.

    PubMed

    Kim, Eric G; Patel, Nirav K; Chughtai, Morad; Elmallah, Randa D K; Delanois, Ronald E; Harwin, Steven F; Mont, Michael A

    2016-11-01

    The best strategy to address large bony defects in revision total knee arthroplasty has yet to be determined. The relatively recent development of porous tantalum cones and their use to address massive bone loss in knee arthroplasty has shown promising short- and intermediate-term results. The purpose of this review is to present the current literature on: (1) basic science of porous tantalum, (2) classification and treatment for bone loss, (3) clinical results, and (4) evolution of newer generation cones.

  20. Causes and consequences of inherited cone disorders.

    PubMed

    Roosing, Susanne; Thiadens, Alberta A H J; Hoyng, Carel B; Klaver, Caroline C W; den Hollander, Anneke I; Cremers, Frans P M

    2014-09-01

    Hereditary cone disorders (CDs) are characterized by defects of the cone photoreceptors or retinal pigment epithelium underlying the macula, and include achromatopsia (ACHM), cone dystrophy (COD), cone-rod dystrophy (CRD), color vision impairment, Stargardt disease (STGD) and other maculopathies. Forty-two genes have been implicated in non-syndromic inherited CDs. Mutations in the 5 genes implicated in ACHM explain ∼93% of the cases. On the contrary, only 21% of CRDs (17 genes) and 25% of CODs (8 genes) have been elucidated. The fact that the large majority of COD and CRD-associated genes are yet to be discovered hints towards the existence of unknown cone-specific or cone-sensitive processes. The ACHM-associated genes encode proteins that fulfill crucial roles in the cone phototransduction cascade, which is the most frequently compromised (10 genes) process in CDs. Another 7 CD-associated proteins are required for transport processes towards or through the connecting cilium. The remaining CD-associated proteins are involved in cell membrane morphogenesis and maintenance, synaptic transduction, and the retinoid cycle. Further novel genes are likely to be identified in the near future by combining large-scale DNA sequencing and transcriptomics technologies. For 31 of 42 CD-associated genes, mammalian models are available, 14 of which have successfully been used for gene augmentation studies. However, gene augmentation for CDs should ideally be developed in large mammalian models with cone-rich areas, which are currently available for only 11 CD genes. Future research will aim to elucidate the remaining causative genes, identify the molecular mechanisms of CD, and develop novel therapies aimed at preventing vision loss in individuals with CD in the future.