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Sample records for 8-harness satin weave

  1. THERMAL-MECHANICAL RESPONSE OF CRACKED SATIN WEAVE CFRP COMPOSITES AT CRYOGENIC TEMPERATURES

    SciTech Connect

    Watanabe, S.; Shindo, Y.; Narita, F.; Takeda, T.

    2008-03-03

    This paper examines the thermal-mechanical response of satin weave carbon fiber reinforced polymer (CFRP) laminates with internal and/or edge cracks subjected to uniaxial tension load at cryogenic temperatures. Cracks are considered to occur in the transverse fiber bundles and extend through the entire thickness of the fiber bundles. Two-dimentional generalized plane strain finite element models are developed to study the effects of residual thermal stresses and cracks on the mechanical behavior of CFRP woven laminates. A detailed examination of the Young's modulus and stress distributions near the crack tip is carried out which provides insight into material behavior at cryogenic temperatures.

  2. Tablet Weaving

    ERIC Educational Resources Information Center

    Kren, Margo

    1976-01-01

    Article described a weaving technique called tablet weaving, an ancient textile process that provides opportunity for making a variety of items, such as guitar straps, belts, and decorative bands. (Author/RK)

  3. Fabrication and physical testing of graphite composite panels utilizing woven graphite fabric with current and advanced state-of-the-art resin systems

    NASA Technical Reports Server (NTRS)

    Lee, S. C. S.

    1979-01-01

    Three weaves were evaluated; a balanced plain weave, a balanced 8-harness satin weave, and a semiunidirectional crowfoot satin weave. The current state-of-the-art resin system selected was Fiberite's 934 Epoxy; the advanced resin systems evaluated were Phenolic, Phenolic/Novolac, Benzyl and Bismaleimide. The panels were fabricated for testing on NASA/Ames Research Center's Composites Modification Program. Room temperature mechanical tests only were performed by Hitco; the results are presented.

  4. Influence of weave structures on the tribological properties of hybrid Kevlar/PTFE fabric composites

    NASA Astrophysics Data System (ADS)

    Gu, Dapeng; Yang, Yulin; Qi, Xiaowen; Deng, Wei; Shi, Lei

    2012-09-01

    The existing research of the woven fabric self-lubricating liner mainly focus on the tribological performance improvements and the service life raised by changing different fiber type combinations, adding additive modification, and performing fiber surface modification. As fabric composites, the weave structures play an important role in the mechanical and tribological performances of the liners. However, hardly any literature is available on the friction and wear behavior of such composites with different weave structures. In this paper, three weave structures (plain, twill 1/3 and satin 8/5) of hybrid Kevlar/PTFE fabric composites are selected and pin-on-flat linear reciprocating wear studies are done on a CETR tester under different pressures and different frequencies. The relationship between the tensile strength and the wear performance are studied. The morphologies of the worn surfaces under the typical test conditions are analyzed by means of scanning electron microscopy (SEM). The analysis results show that at 10 MPa, satin 8/5 performs the best in friction-reduction and antiwear performance, and plain is the worst. At 30 MPa, however, the antiwear performance is reversed and satin 8/5 does not even complete the 2 h wear test at 16 Hz. There is no clear evidence proving that the tensile strength has an influence on the wear performance. So the different tribological performance of the three weave structures of fabric composites may be attributed to the different PTFE proportions in the fabric surface and the different wear mechanisms. The fabric composites are divided into three regions: the lubrication region, the reinforced region and the bonding region. The major mechanisms are fatigue wear and the shear effects of the friction force in the lubrication region. In the reinforced region fiber-matrix de-bonding and fiber breakage are involved. The proposed research proposes a regional wear model and further indicates the wear process and the wear mechanism

  5. WEAVE core processing system

    NASA Astrophysics Data System (ADS)

    Walton, Nicholas A.; Irwin, Mike; Lewis, James R.; Gonzalez-Solares, Eduardo; Dalton, Gavin; Trager, Scott; Aguerri, J. Alfonso L.; Allende Prieto, Carlos; Benn, Chris R.; Abrams, Don Carlos; Picó, Sergio; Middleton, Kevin; Lodi, Marcello; Bonifacio, Piercarlo

    2014-07-01

    WEAVE is an approved massive wide field multi-object optical spectrograph (MOS) currently entering its build phase, destined for use on the 4.2-m William Herschel Telescope (WHT). It will be commissioned and begin survey operations in 2017. This paper describes the core processing system (CPS) system being developed to process the bulk data flow from WEAVE. We describe the processes and techniques to be used in producing the scientifically validated 'Level 1' data products from the WEAVE data. CPS outputs will include calibrated one-d spectra and initial estimates of basic parameters such as radial velocities (for stars) and redshifts (for galaxies).

  6. The interlaminar fracture toughness of woven graphite/epoxy composites

    NASA Technical Reports Server (NTRS)

    Funk, Joan G.; Deaton, Jerry W.

    1989-01-01

    The interlaminar fracture toughness of 2-D graphite/epoxy woven composites was determined as a function of stacking sequence, thickness, and weave pattern. Plain, oxford, 5-harness satin, and 8-harness satin weaves of T300/934 material were evaluated by the double cantilever beam test. The fabric material had a G (sub Ic) ranging from 2 to 8 times greater than 0 degrees unidirectional T300/934 tape material. The interlaminar fracture toughness of a particular weave style was dependent on whether the stacking sequence was symmetric or asymmetric and, in some cases, on the fabric orientation.

  7. Male satin bowerbirds (Ptilonorhynchus violaceus) compensate for sexual signal loss by enhancing multiple display features

    NASA Astrophysics Data System (ADS)

    Bravery, Benjamin D.; Goldizen, Anne W.

    2007-06-01

    Numerous studies have focussed on the relationship between female choice and the multiple exaggerated sexual traits of males. However, little is known about the ability of males to actively enhance specific components of their display in response to the loss of one component. We investigated the capacity of male satin bowerbirds (Ptilonorhynchus violaceus) to respond to the loss of one of their sexual signals by performing an experiment in which we removed decorations at their bowers. We found that males compensated for decoration loss by increasing bower construction behaviour and decreasing their latency to bower painting. These results are novel because they suggest that males can assess the quality of their own display and make decisions about how to augment their displays. We discuss these results in the context of previous studies of mate choice in satin bowerbirds, as both of the supplementary behaviours we observed are known correlates of male mating success.

  8. Iosipescu shear properties of graphite fabric/epoxy composite laminates

    NASA Technical Reports Server (NTRS)

    Walrath, D. E.; Adams, D. F.

    1985-01-01

    The Iosipescu shear test method is used to measure the in-plane and interlaminar shear properties of four T300 graphite fabric/934 epoxy composite materials. Different weave geometries tested include an Oxford weave, a 5-harness satin weave, an 8-harness satin weave, and a plain weave with auxiliary warp yarns. Both orthogonal and quasi-isotropic layup laminates were tested. In-plane and interlaminar shear properties are obtained for laminates of all four fabric types. Overall, little difference in shear properties attributable to the fabric weave pattern is observed. The auxiliary warp material is significantly weaker and less stiff in interlaminar shear parallel to its fill direction. A conventional strain gage extensometer is modified to measure shear strains for use with the Iosipescu shear test. While preliminary results are encouraging, several design iterations failed to produce a reliable shear transducer prototype. Strain gages are still the most reliable shear strain transducers for use with this test method.

  9. The design of the WEAVE spectrograph

    NASA Astrophysics Data System (ADS)

    Rogers, Kevin; Stuik, Remko; Steele, Iain A.; Pragt, Johan; Middleton, Kevin F.; Bates, Stuart; Kragt, Jan; Tromp, Niels; Lesman, Dirk; Lhomé, Emilie; Dalton, Gavin; Trager, Scott; Navarro, Ramon; Abrams, Don C.; Tosh, Ian; Jasko, Attila; Martin, Carlos; O'Mahony, Neil; Pico, Sergio; Cano Infantes, Diego; Bianca, Andrea; Delgado, Jose; Rodríguez, Luis F.

    2014-07-01

    WEAVE is the next-generation optical spectroscopy facility for the William Herschel Telescope and aims at spectroscopic follow-up of ground-based (LOFAR) and space-based (Gaia) surveys. WEAVE places in the re-fitted prime focus either 1000 fibres, 20 fibre-coupled mini-IFUs or a single large 600 fibre IFU. A spectrograph on the Nasmyth platform analyses the light and supports, in a single exposure, either R~5,000 observations over the full 366- 975 nm wavelength range or simultaneous R~20,000 observations over two out of three pre-specified bands within this wavelength range. This paper describes the requirements, optical design and mechanical design of the WEAVE spectrograph.

  10. WAS: Textures of the WEAVE Science Archive

    NASA Astrophysics Data System (ADS)

    Molinari, E.; Guerra, J.; Lodi, M.; Benn, C.; Domínguez, L.

    2016-10-01

    WAS is the WEAVE1 Science Archive, a part of the Science Data Processing of the spectrograph, which keeps a record of all the observations, calibrations, processed spectra and astrophysical metadata obtained with the WEAVE automatic pipelines. It will have connections with all the producers in the system flow, beginning with the surveys catalog compiler, through the Observing Control Software, the Core Processing Software and the Advanced Processing Software. Every version of the products will be recorded and made accessible, and the relevant database will allow basic and more complex searches, filtering and (meta)data retrieval.

  11. A Maori Pedagogy: Weaving the Strands Together

    ERIC Educational Resources Information Center

    Stucki, Paora

    2012-01-01

    Literature on Maori pedagogy up until now has been disparate, some dealing with methodological issues, some with learning theory, some with environment and so forth. This article seeks to build one comprehensive picture of Maori pedagogy by weaving the myriad disparate themes in the literature into one unifying model. It is based on an EdD study…

  12. Weaving in the Story of Science

    ERIC Educational Resources Information Center

    Kirchhoff, Allison

    2008-01-01

    Stories weave common elements of the nature of science between topics and activities, regardless of whether it's short historical narratives about scientists or current event articles that are read. Stories also can help students realize the important contributions of persons of color, women, and other traditionally underrepresented groups. In…

  13. Weaving a Tapestry of Responsible Citizenship

    ERIC Educational Resources Information Center

    Grosenick, Laurie A.

    2009-01-01

    In this article, the author discusses how she compares social studies instruction to weaving a tapestry of responsible citizenship. She discusses strategies she used to help students who have limited or no English (Limited English Proficiency, or LEP) make the transition from home to school. The author's teaching techniques have many sources. A…

  14. Comparative mapping in the beige-satin region of mouse chromosome 13

    SciTech Connect

    Perou, C.M.; Pryor, R.; Kaplan, J.

    1997-01-15

    The proximal end of mouse chromosome (Chr) 13 contains regions conserved on human chromosomes 1q42-q44, 6p23-p21, and 7p22-p13. This region also contains mutations that may be models for human disease, including beige (human Chediak-Higashi syndrome). An interspecific backcross of SB/Le and Mus spretus mice was used to generate a molecular genetic linkage map of mouse chromosome 13 with an emphasis on the proximal region including beige (bg) and satin (sa). This map provides the gene order of the two phenotypic markers bg and sa relative to restriction fragment length polymorphisms and simple sequence length polymorphisms in 131 backcross animals. In parallel, we have created a physical map of the region using Nidogen (Nid) as a molecular starting point for cloning a YAC contig that was used to identify the beige gene. The physical map provides the fine-structure order of genes and anonymous DNA fragments that was not resolved by the genetic linkage mapping. The results show that the bg region of mouse Chr 13 is highly conserved on human Chr 1q42-q44 and provide a starting point for a complete functional analysis of the entire bg-sa interval. 37 refs., 4 figs., 1 tab.

  15. Some remarks on static, creep and fatigue flexural strength of satin woven CFRP laminates

    SciTech Connect

    Miyano, Y.; McMurry, M.K.; Muki, R.

    1995-12-31

    This paper deals with the time-temperature dependent flexural strength of a satin-woven CFRP laminate having a matrix resin with a high glass transition temperature of T{sub g} = 236/C under static, creep and fatigue loading by 3-point bending tests. Static tests were conducted at various points in a wide range of deflection rates and temperatures. The creep and fatigue tests were carried out at various constant temperatures; the fatigue test was conducted at two frequencies. The results of the experimental study are as follows. The flexural strength of the CFRP laminates for all three loading types is time-temperature dependent even near room temperature well below T{sub g}. The time and temperature superposition principle for the matrix resin also holds for the flexural strength of the CFRP laminates. The fracture modes are almost the same for the three loading types under all conditions tested. Finally, we propose a method for predicting the flexural fatigue strength for a given number of cycles to failure at an arbitrary temperature, frequency and stress ratio based on the current experimental findings and considering the relationships among the static, creep and fatigue flexural strengths.

  16. Analysis of Motorcycle Weave Mode by using Energy Flow Method

    NASA Astrophysics Data System (ADS)

    Marumo, Yoshitaka; Katayama, Tsuyoshi

    The activation mechanism of motorcycle weave mode is clarified within the framework of the energy flow method, which calculates energy flow of mechanical forces in each motion. It is demonstrated that only a few mechanical forces affect the stability of the weave mode from among a total of about 40 mechanical forces. The activation of the lateral, yawing and rolling motions destabilize the weave mode, while activation of the steering motion stabilizes the weave mode. A detailed investigation of the energy flow of the steering motion reveals that the steering motion plays an important role in clarifying the characteristics of the weave mode. As activation of the steering motion progresses the phase of the front tire side force, and the weave mode is consequently stabilized. This paper provides a design guide for stabilizing the weave mode and the wobble mode compatibility.

  17. Aerobic capacity in wild satin bowerbirds: repeatability and effects of age, sex and condition.

    PubMed

    Chappell, Mark A; Savard, Jean-Francois; Siani, Jennifer; Coleman, Seth W; Keagy, Jason; Borgia, Gerald

    2011-10-01

    Individual variation in aerobic capacity has been extensively studied, especially with respect to condition, maturity or pathogen infection, and to gain insights into mechanistic foundations of performance. However, its relationship to mate competition is less well understood, particularly for animals in natural habitats. We examined aerobic capacity [maximum rate of O2 consumption (VO2,max) in forced exercise] in wild satin bowerbirds, an Australian passerine with a non-resource based mating system and strong intermale sexual competition. We tested for repeatability of mass and VO2,max, differences among age and sex classes, and effects of several condition indices. In adult males, we examined interactions between aerobic performance and bower ownership (required for male mating success). There was significant repeatability of mass and VO2,max within and between years, but between-year repeatability was lower than within-year repeatability. VO2,max varied with an overall scaling to mass(0.791), but most variance in VO2,max was not explained by mass. Indicators of condition (tarsus and wing length asymmetry, the ratio of tarsus length to mass) were not correlated to VO2,max. Ectoparasite counts were weakly correlated to VO2,max across all age-sex classes but not within any class. Adult males, the cohort with the most intense levels of mating competition, had higher VO2,max than juvenile birds or adult females. However, there was no difference between the VO2,max of bower-owning males and that of males not known to hold bowers. Thus one major factor determining male reproductive success was not correlated to aerobic performance. PMID:21900466

  18. Simplified Micromechanics of Plain Weave Composites

    NASA Technical Reports Server (NTRS)

    Mital, Subodh K.; Murthy, Pappu L. N.; Chamis, Christos C.

    1996-01-01

    A micromechanics based methodology to simulate the complete hygro-thermomechanical behavior of plain weave composites is developed. This methodology is based on micromechanics and the classical laminate theory. The methodology predicts a complete set of thermal, hygral and mechanical properties of plain woven composites, generates necessary data for use in a finite element structural analysis, and predicts stresses all the way from the laminate to the constituent level. This methodology is used in conjunction with a composite mechanics code to analyze and predict the properties/response of a generic graphite/epoxy woven textile composite and a plain weave ceramic composite. The fiber architecture, including the fiber waviness and fiber end distributions through the thickness, is properly accounted for. Predicted results compare reasonably well with those from detailed three-dimensional finite element analyses as well as available experimental data. However, the main advantage of the proposed methodology is its high computational efficiency as compared with three-dimensional finite element analyses.

  19. Creep of plain weave polymer matrix composites

    NASA Astrophysics Data System (ADS)

    Gupta, Abhishek

    Polymer matrix composites are increasingly used in various industrial sectors to reduce structural weight and improve performance. Woven (also known as textile) composites are one class of polymer matrix composites with increasing market share mostly due to their lightweight, their flexibility to form into desired shape, their mechanical properties and toughness. Due to the viscoelasticity of the polymer matrix, time-dependent degradation in modulus (creep) and strength (creep rupture) are two of the major mechanical properties required by engineers to design a structure reliably when using these materials. Unfortunately, creep and creep rupture of woven composites have received little attention by the research community and thus, there is a dire need to generate additional knowledge and prediction models, given the increasing market share of woven composites in load bearing structural applications. Currently, available creep models are limited in scope and have not been validated for any loading orientation and time period beyond the experimental time window. In this thesis, an analytical creep model, namely the Modified Equivalent Laminate Model (MELM), was developed to predict tensile creep of plain weave composites for any orientation of the load with respect to the orientation of the fill and warp fibers, using creep of unidirectional composites. The ability of the model to predict creep for any orientation of the load is a "first" in this area. The model was validated using an extensive experimental involving the tensile creep of plain weave composites under varying loading orientation and service conditions. Plain weave epoxy (F263)/ carbon fiber (T300) composite, currently used in aerospace applications, was procured as fabrics from Hexcel Corporation. Creep tests were conducted under two loading conditions: on-axis loading (0°) and off-axis loading (45°). Constant load creep, in the temperature range of 80-240°C and stress range of 1-70% UTS of the

  20. Weaving child psychoanalysis: Past, present, and future.

    PubMed

    Brinich, Paul M

    2013-01-01

    Using the metaphor of a fabric woven from many threads, this paper describes nine of the many conceptual strands that have contributed to the development of child psychoanalysis over its first century. It notes the unfortunate isolation (sometimes self-imposed) of child analysis from related fields (including adult analysis) and argues that we must recognize both the strengths and weaknesses of our psychoanalytic tools if we are to collaborate with and profit from the work of nonanalytic colleagues. It closes with the suggestion that the continued weaving of child analysis will require the creation of new looms, structures that are able to support a new generation of child analysts and the continued elaboration of the field.

  1. How to Weave a Cognitive Web

    NASA Astrophysics Data System (ADS)

    Morris, R. A.; Dungan, J. L.; Votava, P.

    2006-12-01

    interactions with the sensor and product web through technologies related to plan execution and monitoring. Finally, the process of transforming products to goals requires the development of visualization and goal generation tools based on the notion we call model-based goal-generation. We will highlight recent advances in these software technologies that are relevant to realizing the goal of weaving a cognitive web.

  2. Characterization and development of materials for advanced textile composites

    NASA Technical Reports Server (NTRS)

    Hartness, J. Timothy; Greene, Timothy L.; Taske, Leo E.

    1993-01-01

    Work ongoing under the NASA Langley - Advanced Composite Technology (ACT) program is discussed. The primary emphasis of the work centers around the development and characterization of graphite fiber that has been impregnated with an epoxy powder. Four epoxies have been characterized in towpreg form as to their weaveability and braidability. Initial mechanical properties have been generated on each resin system. These include unidirectional as well as 8-harness satin cloth. Initial 2D and 3D weaving and braiding trials will be reported on as well as initial efforts to develop towpreg suitable for advanced tow placement.

  3. A prototype yarn evaluation tester to rapidly assess comparative weavability of warp yarns without weaving

    Technology Transfer Automated Retrieval System (TEKTRAN)

    The art of weaving continues to be the most predominantly used method of converting textile fibers into fabrics for various end-use applications, including apparel. In fact, the weaving is by far the largest textile manufacturing sector, worldwide. However, the weaving process is complex and costly....

  4. The Circulation and Silence of Weaving Knowledge in Contemporary Navajo Life

    ERIC Educational Resources Information Center

    Yohe, Jill Ahlberg

    2012-01-01

    This article draws upon ethnographic fieldwork within a Navajo community to illustrate how weaving knowledge and practices shape contemporary notions of community identity and belonging. The ongoing exchange of Navajo weaving taboos and the careful management of weaving teachings offers community members various opportunities to share and keep…

  5. How to Weave... the Web Into K-8 Science

    ERIC Educational Resources Information Center

    Wetzel, David R.

    2005-01-01

    Like a search engine for science teachers, How to... "Weave the Web into K-8 Science" is a custom-made guide to bringing the best of the Internet into the classroom. Author David Wetzel has done the work of locating online materials. The book offers resources for Web-based science teaching and learning plus online technical help for both…

  6. Oh What a Tangled Biofilm Web Bacteria Weave

    MedlinePlus

    ... a Tangled Biofilm Web Bacteria Weave Inside Life Science View All Articles | Inside Life Science Home Page Oh What a Tangled Biofilm Web ... Conversations Learning from Bacterial Chatter This Inside Life Science article also appears on LiveScience . Learn about related ...

  7. Weaving Broken Threads: A Portrait of Artist Phil Young.

    ERIC Educational Resources Information Center

    Akwe:kon Journal, 1993

    1993-01-01

    The artwork of Phil Young represents his quest to reconnect his identity with the land and with his Cherokee ancestors and thereby "weave broken threads" of his family history back together. Young discusses his training as an artist, the process of creating his artwork, and what his Cherokee heritage means to him. (LP)

  8. Snakes in the Grass: Weaving Success for Everyone.

    ERIC Educational Resources Information Center

    Ide, Janet L.

    2000-01-01

    Describes "Snakes in the Grass," a weaving project used with special needs students. Discusses the preliminary skill-building activities used, the process for creating the students' individual snakes, and the preparation and process for how the students wove the snakes. (CMK)

  9. Career Unit. The Art of Navajo Rug Weaving.

    ERIC Educational Resources Information Center

    Robb, Edna; And Others

    This career exploration instructional unit on Navajo rug weaving is one of several resulting from the rural southwestern Colorado CEPAC Project (Career Education Process of Attitude Change). This unit consists of (1) five unit objectives (to recognize the importance of sheep in the Indians' life, to realize the time required to prepare wool for…

  10. Weave pattern of accessory heads to the anterior digastric muscle.

    PubMed

    Harvey, Jamison A; Call, Zach; Peterson, Katrina; Wisco, Jonathan J

    2015-10-01

    During routine anatomical dissection, we discovered bilateral superficial and deep heads of the anterior belly of the digastric muscle with concomitant accessory heads arranged in a weave pattern in the submental triangle. In addition, the left stylohyoid muscle coursed deep into the intermediate tendon of the digastric muscle bellies. PMID:25501489

  11. Three-dimensional stress analysis of plain weave composites

    NASA Technical Reports Server (NTRS)

    Whitcomb, John D.

    1989-01-01

    Techniques were developed and described for performing three-dimensional finite element analysis of plain weave composites. Emphasized here are aspects of the analysis which are different from analysis of traditional laminated composites, such as the mesh generation and representative unit cells. The analysis was used to study several different variations of plain weaves which illustrate the effects of tow waviness on composite moduli, Poisson's ratios, and internal strain distributions. In-plane moduli decreased almost linearly with increasing tow waviness. The tow waviness was shown to cause large normal and shear strain concentrations in composites subjected to uniaxial load. These strain concentrations may lead to earlier damage initiation than occurs in traditional cross-ply laminates.

  12. Gaia, PLATO and WEAVE: A Powerful combination for Exoplanet Characterisation

    NASA Astrophysics Data System (ADS)

    Walton, Nicholas

    2015-12-01

    This presentation will describe the powerful linkages between the Gaia and PLATO missions and the potential impact of the WHT’s WEAVE multi-object spectrograph in the study of exoplanet populations.ESA’s Gaia mission commenced its nominal operations phase in July 2014. Its first data release is expected summer 2016. Over the course of its (at least) five year mission, it will discover, via their astrometric signatures, upwards of 20,000 massive Jupiter sized long period planets at distances out to several hundred parsecs around all star types. In addition Gaia will discover a significant number of short period hot Jupiters around M stars. This presentation will discuss the form and content of the first Gaia Data Release. The ESA PLATO mission, planned to launch in 2024, will photometrically observe a million host stars, and will detect, via the transit technique, planets down to Earth masses. PLATO will observe two fields of over 2,000 square degrees for 2 to 3 years each. At least one of these will be in the northern hemisphere. where WEAVE (a new multi object high resolution spectrograph currently under construction for the 4.2m William Herschel Telescope) will have the potential to provide detailed chemical characterisation of the host stars of the Gaia and PLATO exoplanet systems. This will enable insights into, for instance, metallicity of the host star correlations against both massive exoplanets (perhaps confirming current relationships), and lower mass exoplanets.We note how the rapid exploitation of such a potential WEAVE survey could be achieved, utilising the WEAVE processing systems being developed at the IoA, Cambridge, coupled with efficient interfaces to the Cambridge Gaia and PLATO data processing centres.

  13. Experimental and numerical analysis of rider motion in weave conditions

    NASA Astrophysics Data System (ADS)

    Doria, A.; Formentini, M.; Tognazzo, M.

    2012-08-01

    Motorcycle dynamics is characterised by the presence of modes of vibration that may become unstable and lead to dangerous conditions. In particular, the weave mode shows large yaw and roll oscillations of the rear frame and out of phase oscillations of the front frame about the steer axis. The presence of the rider influences the modes of vibration, since the mass, stiffness and damping of limbs modify the dynamic properties of the system; moreover, at low frequency the rider can control oscillations. There are few experimental results dealing with the response of the rider in the presence of large oscillations of the motorcycle. This lack is due to the difficulty of carrying out measurements on the road and of reproducing the phenomena in the laboratory. This paper deals with a research programme aimed at measuring the oscillations of the rider's body on a running motorcycle in the presence of weave. First, testing equipment is presented. It includes a special measurement device that is able to measure the relative motion between the rider and the motorcycle. Then the road tests carried out at increasing speeds (from 160 to 210 km/h) are described and discussed. Best-fitting methods are used for identifying the main features of measured vibrations in terms of natural frequencies, damping ratios and modal shapes. The last section deals with the comparison between measured and simulated response of the motorcycle-rider system in weave conditions; good agreement was found.

  14. Harvesting Energy from the Counterbalancing (Weaving) Movement in Bicycle Riding

    PubMed Central

    Yang, Yoonseok; Yeo, Jeongjin; Priya, Shashank

    2012-01-01

    Bicycles are known to be rich source of kinetic energy, some of which is available for harvesting during speedy and balanced maneuvers by the user. A conventional dynamo attached to the rim can generate a large amount of output power at an expense of extra energy input from the user. However, when applying energy conversion technology to human powered equipments, it is important to minimize the increase in extra muscular activity and to maximize the efficiency of human movements. This study proposes a novel energy harvesting methodology that utilizes lateral oscillation of bicycle frame (weaving) caused by user weight shifting movements in order to increase the pedaling force in uphill riding or during quick speed-up. Based on the 3D motion analysis, we designed and implemented the prototype of an electro-dynamic energy harvester that can be mounted on the bicycle's handlebar to collect energy from the side-to-side movement. The harvester was found to generate substantial electric output power of 6.6 mW from normal road riding. It was able to generate power even during uphill riding which has never been shown with other approaches. Moreover, harvesting of energy from weaving motion seems to increase the economy of cycling by helping efficient usage of human power. PMID:23112598

  15. Harvesting energy from the counterbalancing (weaving) movement in bicycle riding.

    PubMed

    Yang, Yoonseok; Yeo, Jeongjin; Priya, Shashank

    2012-01-01

    Bicycles are known to be rich source of kinetic energy, some of which is available for harvesting during speedy and balanced maneuvers by the user. A conventional dynamo attached to the rim can generate a large amount of output power at an expense of extra energy input from the user. However, when applying energy conversion technology to human powered equipments, it is important to minimize the increase in extra muscular activity and to maximize the efficiency of human movements. This study proposes a novel energy harvesting methodology that utilizes lateral oscillation of bicycle frame (weaving) caused by user weight shifting movements in order to increase the pedaling force in uphill riding or during quick speed-up. Based on the 3D motion analysis, we designed and implemented the prototype of an electro-dynamic energy harvester that can be mounted on the bicycle's handlebar to collect energy from the side-to-side movement. The harvester was found to generate substantial electric output power of 6.6 mW from normal road riding. It was able to generate power even during uphill riding which has never been shown with other approaches. Moreover, harvesting of energy from weaving motion seems to increase the economy of cycling by helping efficient usage of human power.

  16. Harvesting energy from the counterbalancing (weaving) movement in bicycle riding.

    PubMed

    Yang, Yoonseok; Yeo, Jeongjin; Priya, Shashank

    2012-01-01

    Bicycles are known to be rich source of kinetic energy, some of which is available for harvesting during speedy and balanced maneuvers by the user. A conventional dynamo attached to the rim can generate a large amount of output power at an expense of extra energy input from the user. However, when applying energy conversion technology to human powered equipments, it is important to minimize the increase in extra muscular activity and to maximize the efficiency of human movements. This study proposes a novel energy harvesting methodology that utilizes lateral oscillation of bicycle frame (weaving) caused by user weight shifting movements in order to increase the pedaling force in uphill riding or during quick speed-up. Based on the 3D motion analysis, we designed and implemented the prototype of an electro-dynamic energy harvester that can be mounted on the bicycle's handlebar to collect energy from the side-to-side movement. The harvester was found to generate substantial electric output power of 6.6 mW from normal road riding. It was able to generate power even during uphill riding which has never been shown with other approaches. Moreover, harvesting of energy from weaving motion seems to increase the economy of cycling by helping efficient usage of human power. PMID:23112598

  17. Predicting Spacecraft Trajectories by the WeavEncke Method

    NASA Technical Reports Server (NTRS)

    Weaver, Jonathan K.; Adamo, Daniel R.

    2011-01-01

    A combination of methods is proposed of predicting spacecraft trajectories that possibly include multiple maneuvers and/or perturbing accelerations, with greater speed, accuracy, and repeatability than were heretofore achievable. The combination is denoted the WeavEncke method because it is based on unpublished studies by Jonathan Weaver of the orbit-prediction formulation of the noted astronomer Johann Franz Encke. Weaver evaluated a number of alternatives that arise within that formulation, arriving at an orbit-predicting algorithm optimized for complex trajectory operations. In the WeavEncke method, Encke's method of prediction of perturbed orbits is enhanced by application of modern numerical methods. Among these methods are efficient Kepler s-equation time-of-flight solutions and self-starting numerical integration with time as the independent variable. Self-starting numerical integration satisfies the requirements for accuracy, reproducibility, and efficiency (and, hence, speed). Self-starting numerical integration also supports fully analytic regulation of integration step sizes, thereby further increasing speed while maintaining accuracy.

  18. 25 CFR 309.13 - What are examples of other weaving and textiles that are Indian products?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 25 Indians 2 2014-04-01 2014-04-01 false What are examples of other weaving and textiles that are... PROTECTION OF INDIAN ARTS AND CRAFTS PRODUCTS § 309.13 What are examples of other weaving and textiles that are Indian products? (a) Weavings and textiles made by an Indian using a wide variety of...

  19. 25 CFR 309.13 - What are examples of other weaving and textiles that are Indian products?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 25 Indians 2 2010-04-01 2010-04-01 false What are examples of other weaving and textiles that are... PROTECTION OF INDIAN ARTS AND CRAFTS PRODUCTS § 309.13 What are examples of other weaving and textiles that are Indian products? (a) Weavings and textiles made by an Indian using a wide variety of...

  20. 25 CFR 309.13 - What are examples of other weaving and textiles that are Indian products?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 25 Indians 2 2011-04-01 2011-04-01 false What are examples of other weaving and textiles that are... PROTECTION OF INDIAN ARTS AND CRAFTS PRODUCTS § 309.13 What are examples of other weaving and textiles that are Indian products? (a) Weavings and textiles made by an Indian using a wide variety of...

  1. Traffic dynamics around weaving section influenced by accident: Cellular automata approach

    NASA Astrophysics Data System (ADS)

    Kong, Lin-Peng; Li, Xin-Gang; Lam, William H. K.

    2015-07-01

    The weaving section, as a typical bottleneck, is one source of vehicle conflicts and an accident-prone area. Traffic accident will block lanes and the road capacity will be reduced. Several models have been established to study the dynamics around traffic bottlenecks. However, little attention has been paid to study the complex traffic dynamics influenced by the combined effects of bottleneck and accident. This paper presents a cellular automaton model to characterize accident-induced traffic behavior around the weaving section. Some effective control measures are proposed and verified for traffic management under accident condition. The total flux as a function of inflow rates, the phase diagrams, the spatial-temporal diagrams, and the density and velocity profiles are presented to analyze the impact of accident. It was shown that the proposed control measures for weaving traffic can improve the capacity of weaving section under both normal and accident conditions; the accidents occurring on median lane in the weaving section are more inclined to cause traffic jam and reduce road capacity; the capacity of weaving section will be greatly reduced when the accident happens downstream the weaving section.

  2. Systematics, phylogeny, and evolution of orb-weaving spiders.

    PubMed

    Hormiga, Gustavo; Griswold, Charles E

    2014-01-01

    The orb-weaving spiders (Orbiculariae) comprise more than 25% of the approximately 44,000 known living spider species and produce a remarkable variety of webs. The wheel-shaped orb web is primitive to this clade, but most Orbiculariae make webs hardly recognizable as orbs. Orb-weavers date at least to the Jurassic. With no evidence for convergence of the orb web, the monophyly of the two typical orb web taxa, the cribellate Deinopoidea and ecribellate Araneoidea, remains problematic, supported only weakly by molecular studies. The sister group of the Orbiculariae also remains elusive. Despite more than 15 years of phylogenetic scrutiny, a fully resolved cladogram of the Orbiculariae families is not yet possible. More comprehensive taxon sampling, comparative morphology, and new molecular markers are required for a better understanding of orb-weaver evolution.

  3. Towards an Integrated Model of the WEAVE Performance

    NASA Astrophysics Data System (ADS)

    Ham, S. J.; Dalton, G.

    2016-10-01

    WEAVE is a new facility instrument for the 4.2 m William Herschel Telescope (WHT). The instrument has a 2° field of view and covers a wavelength range of 366-950 nm with up to 960 simultaneous spectra in each observation. The spectrograph consists of a collimator mirror and two correcting lenses before a VPH grating and two 8-lens cameras. The two cameras have been designed to have the same lens shapes. Here we report on the development of detailed simulations for the verification of the whole data reduction procedure and analysis pipeline, and for the generation of high signal-to-noise reference images that can be used as fitting templates for fiber positions and PSF mapping.

  4. Weaves as an Interconnection Fabric for ASIM's and Nanosatellites

    NASA Technical Reports Server (NTRS)

    Gorlick, Michael M.

    1995-01-01

    Many of the micromachines under consideration require computer support, indeed, one of the appeals of this technology is the ability to intermix mechanical, optical, analog, and digital devices on the same substrate. The amount of computer power is rarely an issue, the sticking point is the complexity of the software required to make effective use of these devices. Micromachines are the nano-technologist's equivalent of 'golden screws'. In other words, they will be piece parts in larger assemblages. For example, a nano-satellite may be composed of stacked silicon wafers where each wafer contains hundreds to thousands of micromachines, digital controllers, general purpose computers, memories, and high-speed bus interconnects. Comparatively few of these devices will be custom designed, most will be stock parts selected from libraries and catalogs. The novelty will lie in the interconnections. For example, a digital accelerometer may be a component part in an adaptive suspension, a monitoring element embedded in the wrapper of a package, or a portion of the smart skin of a launch vehicle. In each case, this device must inter-operate with other devices and probes for the purposes of command, control, and communication. We propose a software technology called 'weaves' that will permit large collections of micromachines and their attendant computers to freely intercommunicate while preserving modularity, transparency, and flexibility. Weaves are composed of networks of communicating software components. The network, and the components comprising it, may be changed even while the software, and the devices it controls, are executing. This unusual degree of software plasticity permits micromachines to dynamically adapt the software to changing conditions and allows system engineers to rapidly and inexpensively develop special purpose software by assembling stock software components in custom configurations.

  5. Weaving a Formal Methods Education with Problem-Based Learning

    NASA Astrophysics Data System (ADS)

    Gibson, J. Paul

    The idea of weaving formal methods through computing (or software engineering) degrees is not a new one. However, there has been little success in developing and implementing such a curriculum. Formal methods continue to be taught as stand-alone modules and students, in general, fail to see how fundamental these methods are to the engineering of software. A major problem is one of motivation — how can the students be expected to enthusiastically embrace a challenging subject when the learning benefits, beyond passing an exam and achieving curriculum credits, are not clear? Problem-based learning has gradually moved from being an innovative pedagogique technique, commonly used to better-motivate students, to being widely adopted in the teaching of many different disciplines, including computer science and software engineering. Our experience shows that a good problem can be re-used throughout a student's academic life. In fact, the best computing problems can be used with children (young and old), undergraduates and postgraduates. In this paper we present a process for weaving formal methods through a University curriculum that is founded on the application of problem-based learning and a library of good software engineering problems, where students learn about formal methods without sitting a traditional formal methods module. The process of constructing good problems and integrating them into the curriculum is shown to be analagous to the process of engineering software. This approach is not intended to replace more traditional formal methods modules: it will better prepare students for such specialised modules and ensure that all students have an understanding and appreciation for formal methods even if they do not go on to specialise in them.

  6. Weaving and bonding method to prevent warp and fill distortion

    NASA Technical Reports Server (NTRS)

    Farley, Gary L. (Inventor)

    1997-01-01

    A method to prevent fiber distortion in textile materials employed in a modified weaving process. In a first embodiment, a tacifier in powder form is applied to the yarn and melted while on the fabric. Cool air is then supplied after the tacifier has melted to expedite the solidification of the tacifier. In a second embodiment, a solution form of a tacifier is used by dissolving the tacifier into a solvent that has a high evaporation rate. The solution is then sprayed onto the fabric or fill yarn as each fill yarn is inserted into a shed of the fabric. A third embodiment applies the tacifier in a liquid form that has not been dissolved in a solvent. That is, the tacifier is melted and is sprayed as a liquid onto the fabric or fill yarn as it is being extracted from a fill yarn spool prior to the fill yarn being inserted into the shed of the fabric. A fourth embodiment employs adhesive yarns contained as an integral part of the warp or fill yarn. Additional tacifier material is not required because a matrix is used as the tacifier. The matrix is then locally melted using heating elements on clamping bars or take-up rollers, is cooled, if necessary, and solidified.

  7. Weaving spirituality into organizational life. Suggestions for processes and programs.

    PubMed

    Craigie, F C

    1998-01-01

    Recent research has demonstrated a clear link between spirituality and health, but it remains a challenge for many organizations to weave spirituality into organizational life and make it an integral component of clinical care. Three dimensions of spirituality work together in healthcare: spiritual well-being of patients and families, spiritual well-being of workers, and spiritual well-being of the organization. To cultivate these dimensions in the life of healthcare organizations, several strategies may be employed. First, the definition of "spirituality" must be clear. Consider spirituality at the core of providing healthcare, instead of parallel to or part of clinical approaches. Separate spirituality from chaplaincy, since nurturing spiritual values is the responsibility of everyone in the organization. It is important to affirm what people already do spiritually, focus on what they have to offer instead of on deficiencies, and cultivate spirituality individual by individual. Organizational leaders must demonstrate spirituality in their personal and professional lives, and keep the organizational mission to the fore. When working to enhance organizational spirituality, create a vision within the organization of its spirituality and emphasize peer support and collaboration. Programs to help organizations inculcate spirituality include retreats or renewal programs for employees, forums to explore employees' spirituality, inclusion of spiritual issues in training and orientation programs, educational and development programs for working groups, regular review of spiritual well-being, training selected employees as spiritual facilitators, and supporting research on spirituality, health, and healthcare. PMID:10178083

  8. Oldest true orb-weaving spider (Araneae: Araneidae).

    PubMed

    Penney, David; Ortuño, Vicente M

    2006-09-22

    The aerial orb web woven by spiders of the family Araneidae typifies these organisms to laypersons and scientists alike. Here we describe the oldest fossil species of this family, which is preserved in amber from Alava, Spain and represents the first record of Araneidae from the Lower Cretaceous. The fossils provide direct evidence that all three major orb web weaving families: Araneidae, Tetragnathidae and Uloboridae had evolved by this time, confirming the antiquity of the use of this remarkable structure as a prey capture strategy by spiders. Given the complex and stereotyped movements that all orb weavers use to construct their webs, there is little question regarding their common origin, which must have occurred in the Jurassic or earlier. Thus, various forms of this formidable prey capture mechanism were already in place by the time of the explosive Cretaceous co-radiation of angiosperms and their flying insect pollinators. This permitted a similar co-radiation of spider predators with their flying insect prey, presumably without the need for a 'catch-up lag phase' for the spiders.

  9. When Sandpaper Is 'Kiki' and Satin Is 'Bouba': an Exploration of the Associations Between Words, Emotional States, and the Tactile Attributes of Everyday Materials.

    PubMed

    Etzi, Roberta; Spence, Charles; Zampini, Massimiliano; Gallace, Alberto

    2016-01-01

    Over the last decade, scientists working on the topic of multisensory integration, as well as designers and marketers involved in trying to understand consumer behavior, have become increasingly interested in the non-arbitrary associations (e.g., sound symbolism) between different sensorial attributes of the stimuli they work with. Nevertheless, to date, little research in this area has investigated the presence of these crossmodal correspondences in the tactile evaluation of everyday materials. Here, we explore the presence and nature of the associations between tactile sensations, the sound of non-words, and people's emotional states. Samples of cotton, satin, tinfoil, sandpaper, and abrasive sponge, were stroked along the participants' forearm at the speed of 5 cm/s. Participants evaluated the materials along several dimensions, comprising scales anchored by pairs of non-words (e.g., Kiki/Bouba) and adjectives (e.g., ugly/beautiful). The results revealed that smoother textures were associated with non-words made up of round-shaped sounds (e.g., Maluma), whereas rougher textures were more strongly associated with sharp-transient sounds (e.g., Takete). The results also revealed the presence of a number of correspondences between tactile surfaces and adjectives related to visual and auditory attributes. For example, smooth textures were associated with features evoked by words such as 'bright' and 'quiet'; by contrast, the rougher textures were associated with adjectives such as 'dim' and 'loud'. The textures were also found to be associated with a number of emotional labels. Taken together, these results further our understanding of crossmodal correspondences involving the tactile modality and provide interesting insights in the applied field of design and marketing. PMID:27311294

  10. When Sandpaper Is 'Kiki' and Satin Is 'Bouba': an Exploration of the Associations Between Words, Emotional States, and the Tactile Attributes of Everyday Materials.

    PubMed

    Etzi, Roberta; Spence, Charles; Zampini, Massimiliano; Gallace, Alberto

    2016-01-01

    Over the last decade, scientists working on the topic of multisensory integration, as well as designers and marketers involved in trying to understand consumer behavior, have become increasingly interested in the non-arbitrary associations (e.g., sound symbolism) between different sensorial attributes of the stimuli they work with. Nevertheless, to date, little research in this area has investigated the presence of these crossmodal correspondences in the tactile evaluation of everyday materials. Here, we explore the presence and nature of the associations between tactile sensations, the sound of non-words, and people's emotional states. Samples of cotton, satin, tinfoil, sandpaper, and abrasive sponge, were stroked along the participants' forearm at the speed of 5 cm/s. Participants evaluated the materials along several dimensions, comprising scales anchored by pairs of non-words (e.g., Kiki/Bouba) and adjectives (e.g., ugly/beautiful). The results revealed that smoother textures were associated with non-words made up of round-shaped sounds (e.g., Maluma), whereas rougher textures were more strongly associated with sharp-transient sounds (e.g., Takete). The results also revealed the presence of a number of correspondences between tactile surfaces and adjectives related to visual and auditory attributes. For example, smooth textures were associated with features evoked by words such as 'bright' and 'quiet'; by contrast, the rougher textures were associated with adjectives such as 'dim' and 'loud'. The textures were also found to be associated with a number of emotional labels. Taken together, these results further our understanding of crossmodal correspondences involving the tactile modality and provide interesting insights in the applied field of design and marketing.

  11. Dynamic Data Visualization with Weave and Brain Choropleths.

    PubMed

    Patterson, Dianne; Hicks, Thomas; Dufilie, Andrew; Grinstein, Georges; Plante, Elena

    2015-01-01

    This article introduces the neuroimaging community to the dynamic visualization workbench, Weave (https://www.oicweave.org/), and a set of enhancements to allow the visualization of brain maps. The enhancements comprise a set of brain choropleths and the ability to display these as stacked slices, accessible with a slider. For the first time, this allows the neuroimaging community to take advantage of the advanced tools already available for exploring geographic data. Our brain choropleths are modeled after widely used geographic maps but this mashup of brain choropleths with extant visualization software fills an important neuroinformatic niche. To date, most neuroinformatic tools have provided online databases and atlases of the brain, but not good ways to display the related data (e.g., behavioral, genetic, medical, etc). The extension of the choropleth to brain maps allows us to leverage general-purpose visualization tools for concurrent exploration of brain images and related data. Related data can be represented as a variety of tables, charts and graphs that are dynamically linked to each other and to the brain choropleths. We demonstrate that the simplified region-based analyses that underlay choropleths can provide insights into neuroimaging data comparable to those achieved by using more conventional methods. In addition, the interactive interface facilitates additional insights by allowing the user to filter, compare, and drill down into the visual representations of the data. This enhanced data visualization capability is useful during the initial phases of data analysis and the resulting visualizations provide a compelling way to publish data as an online supplement to journal articles. PMID:26418012

  12. Dynamic Data Visualization with Weave and Brain Choropleths

    PubMed Central

    Patterson, Dianne; Hicks, Thomas; Dufilie, Andrew; Grinstein, Georges; Plante, Elena

    2015-01-01

    This article introduces the neuroimaging community to the dynamic visualization workbench, Weave (https://www.oicweave.org/), and a set of enhancements to allow the visualization of brain maps. The enhancements comprise a set of brain choropleths and the ability to display these as stacked slices, accessible with a slider. For the first time, this allows the neuroimaging community to take advantage of the advanced tools already available for exploring geographic data. Our brain choropleths are modeled after widely used geographic maps but this mashup of brain choropleths with extant visualization software fills an important neuroinformatic niche. To date, most neuroinformatic tools have provided online databases and atlases of the brain, but not good ways to display the related data (e.g., behavioral, genetic, medical, etc). The extension of the choropleth to brain maps allows us to leverage general-purpose visualization tools for concurrent exploration of brain images and related data. Related data can be represented as a variety of tables, charts and graphs that are dynamically linked to each other and to the brain choropleths. We demonstrate that the simplified region-based analyses that underlay choropleths can provide insights into neuroimaging data comparable to those achieved by using more conventional methods. In addition, the interactive interface facilitates additional insights by allowing the user to filter, compare, and drill down into the visual representations of the data. This enhanced data visualization capability is useful during the initial phases of data analysis and the resulting visualizations provide a compelling way to publish data as an online supplement to journal articles. PMID:26418012

  13. A WEAVE Radial Velocity Survey to Unravel the Nature of the Milky Way's Spiral Arms

    NASA Astrophysics Data System (ADS)

    Monguió, M.; Figueras, F.; Grosbøl, P.

    2016-10-01

    The nature of the spiral arms of our Milky Way Galaxy is still a matter of debate. Different theories have been suggested (density waves, swing amplification, invariant manifolds...) which impose several constraints on the observables. For the first time it will be possible to disentangle these theories by combining Gaia and WEAVE data. Great advantage comes from the fact that WEAVE is in the Northern Hemisphere, that is with good coverage towards the galactic anticenter. We plan to quantify the kinematic perturbation induced by the Perseus spiral arm through radial velocity measurements. We show how, for the first time, we have detected the stellar overdensity associated with the Perseus arm using a Strömgren photometric survey with the Wide Field Camera on the Isaac Newton Telescope. This survey has allowed us to perform first tests on WEAVE capabilities.

  14. Investigating Cultural Evolution Using Phylogenetic Analysis: The Origins and Descent of the Southeast Asian Tradition of Warp Ikat Weaving

    PubMed Central

    Buckley, Christopher D.

    2012-01-01

    The warp ikat method of making decorated textiles is one of the most geographically widespread in southeast Asia, being used by Austronesian peoples in Indonesia, Malaysia and the Philippines, and Daic peoples on the Asian mainland. In this study a dataset consisting of the decorative characters of 36 of these warp ikat weaving traditions is investigated using Bayesian and Neighbornet techniques, and the results are used to construct a phylogenetic tree and taxonomy for warp ikat weaving in southeast Asia. The results and analysis show that these diverse traditions have a common ancestor amongst neolithic cultures the Asian mainland, and parallels exist between the patterns of textile weaving descent and linguistic phylogeny for the Austronesian group. Ancestral state analysis is used to reconstruct some of the features of the ancestral weaving tradition. The widely held theory that weaving motifs originated in the late Bronze Age Dong-Son culture is shown to be inconsistent with the data. PMID:23272211

  15. Analysis of woven and braided fabric reinforced composites

    NASA Technical Reports Server (NTRS)

    Naik, Rajiv A.

    1994-01-01

    A general purpose micromechanics analysis that discretely models the yarn architecture within the textile repeating unit cell, was developed to predict overall, three dimensional, thermal and mechanical properties. This analytical technique was implemented in a user-friendly, personal computer-based, windows compatible code called Textile Composite Analysis for Design (TEXCAD). TEXCAD was used to analyze plain, 5-harness satin, and 8-harness satin weave composites along with 2-D braided and 2x2, 2-D triaxial braided composites. The calculated overall stiffnesses correlated well with available 3-D finite element results and test data for both the woven and the braided composites. Parametric studies were performed to investigate the effects of yarn size on the yarn crimp and the overall thermal and mechanical constants for plain weave composites. The effects of braid angle were investigated for the 2-D braided composites. Finally, the effects of fiber volume fraction on the yarn undulations and the thermal and mechanical properties of 2x2, 2-D triaxial braided composites were also investigated.

  16. Insertion of Dye-Sensitized Solar Cells in Textiles using a Conventional Weaving Process

    PubMed Central

    Yun, Min Ju; Cha, Seung I.; Seo, Seon Hee; kim, Han Seong; Lee, Dong Y.

    2015-01-01

    Increasing demands for wearable energy sources and highly flexible, lightweight photovoltaic devices have stimulated the development of textile-structured solar cells. However, the former approach of wire-type solar cell fabrication, followed by weaving of these devices, has had limited success, due to device failure caused by high friction forces and tension forces during the weaving process. To overcome this limitation, we present a new approach for textile solar cell fabrication, in which dye-sensitized solar cell (DSSC) electrodes are incorporated into the textile during the weaving process, using the textile warp as a spacer to maintain the DSSC structure. Porous, dye-loaded TiO2-coated holed metal ribbon and Pt nanoparticle-loaded carbon yarn were used as the photoanode and counterelectrode, respectively. The highly flexible textile-based solar cell was fabricated using a common weaving process with a loom. The inserted DSSCs in the textile demonstrated an energy conversion efficiency of 2.63% (at 1 sun, 1.5 A.M.). Our results revealed that additional performance enhancement was possible by considering other electrode materials and textile structures, as well as where and how the DSSC electrodes are inserted. In addition, we demonstrated that the inserted DSSCs could be electrically connected using a parallel configuration. PMID:26087134

  17. Weaving Contexts of Participation Online: The Digital Tapestry of Secondary English Teachers

    ERIC Educational Resources Information Center

    Rodesiler, Luke

    2014-01-01

    This article presents research from a qualitative study exploring five secondary English teachers' professionally oriented participation online. Drawing upon Cole's (1996) "surround" and "weaving" views of context, the specific line of research featured here was guided by the following question: What are the features…

  18. Weaving the tapestry of learning: simulation, standardized patients, and virtual communities.

    PubMed

    Holland, Brian; Landry, Karen; Mountain, Angela; Middlebrooks, Mary Alice; Heim, Deborah; Missildine, Kathy

    2013-01-01

    Using situated cognition learning theory, nursing faculty developed simulated clinical learning experiences integrating virtual communities and standardized patients. These learning experiences provide authenticity and realism not easily achieved using the individual techniques in isolation. The authors describe the process of weaving these strategies into a rich learning experience for students.

  19. Insertion of Dye-Sensitized Solar Cells in Textiles using a Conventional Weaving Process.

    PubMed

    Yun, Min Ju; Cha, Seung I; Seo, Seon Hee; Kim, Han Seong; Lee, Dong Y

    2015-01-01

    Increasing demands for wearable energy sources and highly flexible, lightweight photovoltaic devices have stimulated the development of textile-structured solar cells. However, the former approach of wire-type solar cell fabrication, followed by weaving of these devices, has had limited success, due to device failure caused by high friction forces and tension forces during the weaving process. To overcome this limitation, we present a new approach for textile solar cell fabrication, in which dye-sensitized solar cell (DSSC) electrodes are incorporated into the textile during the weaving process, using the textile warp as a spacer to maintain the DSSC structure. Porous, dye-loaded TiO2-coated holed metal ribbon and Pt nanoparticle-loaded carbon yarn were used as the photoanode and counterelectrode, respectively. The highly flexible textile-based solar cell was fabricated using a common weaving process with a loom. The inserted DSSCs in the textile demonstrated an energy conversion efficiency of 2.63% (at 1 sun, 1.5 A.M.). Our results revealed that additional performance enhancement was possible by considering other electrode materials and textile structures, as well as where and how the DSSC electrodes are inserted. In addition, we demonstrated that the inserted DSSCs could be electrically connected using a parallel configuration.

  20. Learning to Weave the Threads of Honor: Understanding the Value of Female Schooling in Southern Morocco

    ERIC Educational Resources Information Center

    Naji, Myriem

    2012-01-01

    This article is concerned with the role of formal education in the upward social mobility of women in the Sirwa, a marginal Berber region of southern Morocco where carpets are produced by women, and marketed by men. To explore why girls' education in weaving takes precedence over formal education, the article considers the place of women's…

  1. The Weaving of a Tapestry: A Metaphor for Teacher Education Curriculum Development

    ERIC Educational Resources Information Center

    Simon, Susan E

    2013-01-01

    Teacher educators rightfully dream of delivering inspiring programs to benefit future teachers and the students they will in turn inspire. However, in the current teacher education environment in Australia, the artisan's craft of weaving rich texture and producing a masterpiece is potentially over-shadowed by the educational…

  2. Insertion of Dye-Sensitized Solar Cells in Textiles using a Conventional Weaving Process.

    PubMed

    Yun, Min Ju; Cha, Seung I; Seo, Seon Hee; Kim, Han Seong; Lee, Dong Y

    2015-01-01

    Increasing demands for wearable energy sources and highly flexible, lightweight photovoltaic devices have stimulated the development of textile-structured solar cells. However, the former approach of wire-type solar cell fabrication, followed by weaving of these devices, has had limited success, due to device failure caused by high friction forces and tension forces during the weaving process. To overcome this limitation, we present a new approach for textile solar cell fabrication, in which dye-sensitized solar cell (DSSC) electrodes are incorporated into the textile during the weaving process, using the textile warp as a spacer to maintain the DSSC structure. Porous, dye-loaded TiO2-coated holed metal ribbon and Pt nanoparticle-loaded carbon yarn were used as the photoanode and counterelectrode, respectively. The highly flexible textile-based solar cell was fabricated using a common weaving process with a loom. The inserted DSSCs in the textile demonstrated an energy conversion efficiency of 2.63% (at 1 sun, 1.5 A.M.). Our results revealed that additional performance enhancement was possible by considering other electrode materials and textile structures, as well as where and how the DSSC electrodes are inserted. In addition, we demonstrated that the inserted DSSCs could be electrically connected using a parallel configuration. PMID:26087134

  3. Skilled Dialogue: Weaving Webs of Connectedness across Diverse Voices and Identities

    ERIC Educational Resources Information Center

    Barrera, Isaura; Kramer, Lucinda

    2007-01-01

    In this article, the authors discuss the Skilled Dialogue approach as a practical framework to help teachers access the richness of diverse perspectives and weave webs of connectedness that honor the identity and voice of all concerned, not just those from the culture deemed to be normative. More specifically, the authors identify specific Skilled…

  4. Weaving Wisdom with Hard Work: Accomplished Student Learns, Grows, and Gives Back

    ERIC Educational Resources Information Center

    Kuhl, Eleanor

    2010-01-01

    Linda Taylor (Dine) raises sheep and horses, creates sculpture, paints, teaches traditional weaving classes, hunts solo for elk and deer, and volunteers at the Methodist Thrift Shop. In the past, she has also cared for Native children in need, and she is currently applying to foster a Navajo girl. On weekends, she sells bales of hay at the…

  5. Experimental Characterization and Micromechanical Modeling of Woven Carbon/Copper Composites

    NASA Technical Reports Server (NTRS)

    Bednarcyk, Brett A.; Pauly, Christopher C.; Pindera, Marek-Jerzy

    1997-01-01

    The results of an extensive experimental characterization and a preliminary analytical modeling effort for the elastoplastic mechanical behavior of 8-harness satin weave carbon/copper (C/Cu) composites are presented. Previous experimental and modeling investigations of woven composites are discussed, as is the evolution of, and motivation for, the continuing research on C/Cu composites. Experimental results of monotonic and cyclic tension, compression, and Iosipescu shear tests, and combined tension-compression tests, are presented. With regard to the test results, emphasis is placed on the effect of strain gauge size and placement, the effect of alloying the copper matrix to improve fiber-matrix bonding, yield surface characterization, and failure mechanisms. The analytical methodology used in this investigation consists of an extension of the three-dimensional generalized method of cells (GMC-3D) micromechanics model, developed by Aboudi (1994), to include inhomogeneity and plasticity effects on the subcell level. The extension of the model allows prediction of the elastoplastic mechanical response of woven composites, as represented by a true repeating unit cell for the woven composite. The model is used to examine the effects of refining the representative geometry of the composite, altering the composite overall fiber volume fraction, changing the size and placement of the strain gauge with respect to the composite's reinforcement weave, and including porosity within the infiltrated fiber yarns on the in-plane elastoplastic tensile, compressive, and shear response of 8-harness satin C/Cu. The model predictions are also compared with the appropriate monotonic experimental results.

  6. The effect of the inflation pressure of tyres on motorcycle weave stability: experiments and simulation

    NASA Astrophysics Data System (ADS)

    Cossalter, V.; Favaron, V.; Giolo, E.; Jomaa, T.

    2016-10-01

    Increasing the stability of a motorcycle requires an understanding of the optimal conditions of the tyre. The inflation pressure is one of the main parameters that directly affects the tyre properties, which in turn influences motorcycle stability and safety. This paper focuses on the effect of the inflation pressure of the tested tyres on motorcycle weave stability. Experimental data are collected from tests carried out in straight running at constant speed. The data analysis is based on stochastic subspace identification methods. Simulations are performed using an advanced motorcycle multi-body code with parameters measured from the tested vehicle. Finally, the comparison between simulations and experimental tests is discussed. The research results show an agreement between experimental tests and simulations where weave stability increases with inflation pressure for the specified range of tyre pressure.

  7. Group and insidious tetraethyl lead poisoning occurred in industry of plastic weaving: a case report.

    PubMed

    Zhang, Feng; Bai, Ying; Zhu, Baoli; Zhu, Wenjing; Ye, Mingxian

    2016-05-01

    Tetraethyl lead (TEL) poisoning has declined sharply with decreasing consumption of gasoil and other chemicals contained TEL. Here we reported group TEL poisoning in the plastic weaving factory. We investigated 16 cases with the typical nerves disorder which is similar to organotin poisoning, and the result suggested that the poisoning may cause by applied "white oil" contented TEL. Despite its rareness, our cases emphasize that clinicians should pay attention to the difference from the treatment of organic tin poisoning. PMID:27162692

  8. The hardware control system for WEAVE at the William Herschel telescope

    NASA Astrophysics Data System (ADS)

    Delgado Hernandez, Jose M.; Rodríguez-Ramos, Luis F.; Cano Infantes, Diego; Martin, Carlos; Bevil, Craige; Picó, Sergio; Dee, Kevin M.; Abrams, Don Carlos; Lewis, Ian J.; Pragt, Johan; Stuik, Remko; Tromp, Niels; Dalton, Gavin; L. Aguerri, J. Alfonso; Bonifacio, Piercarlo; Middleton, Kevin F.; Trager, Scott C.

    2014-07-01

    This work describes the hardware control system of the Prime Focus Corrector (PFC) and the Spectrograph, two of the main parts of WEAVE, a multi-object fiber spectrograph for the WHT Telescope. The PFC and Spectrograph control system hardware is based on the Allen Bradley's Programmable Automation Controller and its modules. Mechanisms, sensors and actuators of both systems are summarized and their functionality described, showing how they meet the instrument requirements.

  9. Group and insidious tetraethyl lead poisoning occurred in industry of plastic weaving: a case report.

    PubMed

    Zhang, Feng; Bai, Ying; Zhu, Baoli; Zhu, Wenjing; Ye, Mingxian

    2016-05-01

    Tetraethyl lead (TEL) poisoning has declined sharply with decreasing consumption of gasoil and other chemicals contained TEL. Here we reported group TEL poisoning in the plastic weaving factory. We investigated 16 cases with the typical nerves disorder which is similar to organotin poisoning, and the result suggested that the poisoning may cause by applied "white oil" contented TEL. Despite its rareness, our cases emphasize that clinicians should pay attention to the difference from the treatment of organic tin poisoning.

  10. Group and insidious tetraethyl lead poisoning occurred in industry of plastic weaving: a case report

    PubMed Central

    Zhang, Feng; Bai, Ying; Zhu, Wenjing; Ye, Mingxian

    2016-01-01

    Tetraethyl lead (TEL) poisoning has declined sharply with decreasing consumption of gasoil and other chemicals contained TEL. Here we reported group TEL poisoning in the plastic weaving factory. We investigated 16 cases with the typical nerves disorder which is similar to organotin poisoning, and the result suggested that the poisoning may cause by applied “white oil” contented TEL. Despite its rareness, our cases emphasize that clinicians should pay attention to the difference from the treatment of organic tin poisoning. PMID:27162692

  11. Full-thickness Scalp Injury Due to Hair Braiding and Weave

    PubMed Central

    Grunzweig, Katherine

    2015-01-01

    Summary: Full-thickness scalp necrosis secondary to hair weave placement is a rare but serious complication of a common hairstyle. The defects can be large and may necessitate complex reconstruction with hair-bearing tissue. We report on the case of a young woman with extensive scalp loss following tight spiral braiding. The case description illustrates this relatively unknown complication, its treatment, and possible preventative measures. PMID:26495190

  12. Simulation of Complex Cracking in Plain Weave C/SiC Composite under Biaxial Loading

    NASA Technical Reports Server (NTRS)

    Cheng, Ron-Bin; Hsu, Su-Yuen

    2012-01-01

    Finite element analysis is performed on a mesh, based on computed geometry of a plain weave C/SiC composite with assumed internal stacking, to reveal the pattern of internal damage due to biaxial normal cyclic loading. The simulation encompasses intertow matrix cracking, matrix cracking inside the tows, and separation at the tow-intertow matrix and tow-tow interfaces. All these dissipative behaviors are represented by traction-separation cohesive laws. Not aimed at quantitatively predicting the overall stress-strain relation, the simulation, however, does not take the actual process of fiber debonding into account. The fiber tows are represented by a simple rule-of-mixture model where the reinforcing phase is a hypothetical one-dimensional material. Numerical results indicate that for the plain weave C/SiC composite, 1) matrix-crack initiation sites are primarily determined by large intertow matrix voids and interlayer tow-tow contacts, 2) the pattern of internal damage strongly depends on the loading path and initial stress, 3) compressive loading inflicts virtually no damage evolution. KEY WORDS: ceramic matrix composite, plain weave, cohesive model, brittle failure, smeared crack model, progressive damage, meso-mechanical analysis, finite element.

  13. The allometry of CNS size and consequences of miniaturization in orb-weaving and cleptoparasitic spiders.

    PubMed

    Quesada, Rosannette; Triana, Emilia; Vargas, Gloria; Douglass, John K; Seid, Marc A; Niven, Jeremy E; Eberhard, William G; Wcislo, William T

    2011-11-01

    Allometric studies of the gross neuroanatomy of adults from nine species of spiders from six web-weaving families (Orbicularia), and nymphs from six of these species, show that very small spiders resemble other small animals in having disproportionately larger central nervous systems (CNSs) relative to body mass when compared with large-bodied forms. Small spiderlings and minute adult spiders have similar relative CNS volumes. The relatively large CNS of a very small spider occupies up to 78% of the cephalothorax volume. The CNSs of very small spiders extend into their coxae, occupying as much as 26% of the profile area of the coxae of an Anapisona simoni spiderling (body mass < 0.005 mg). Such modifications occur both in species with minute adults, and in tiny spiderlings of species with large-bodied adults. In at least one such species, Leucauge mariana, the CNS of the spiderling extends into a prominent ventral bulge of the sternum. Tiny spiders also have reduced neuronal cell body diameters. The adults of nearly all orbicularian spiders weave prey capture webs, as do the spiderlings, beginning with second instar nymphs. Comparable allometric relations occur in adults of both orb-weaving and cleptoparasitic species, indicating that this behavioral difference is not reflected in differences in gross CNS allometry. PMID:22036838

  14. Effect of various approximations on predicted progressive failure in plain weave composites

    NASA Technical Reports Server (NTRS)

    Whitcomb, John; Srirengan, Kanthikannan

    1995-01-01

    Three-dimensional finite element analysis was used to simulate progressive failure of a plain weave composite subjected to in-plane extension. The loading was parallel to one of the tow directions. The effects of various characteristics of the finite element model on predicted behavior were examined. The predicted behavior was found to be sensitive to quadrature order, mesh refinement, and the material degradation model. Also the sensitivity of the predictions to the tow waviness was studied. The predicted strength decreased considerably with increased waviness. More numerical studies and comparisons with experimental data are needed to establish reliable guidelines for accurate progressive failure prediction.

  15. Aerial web-weaving spiders: Linking molecular and organismal processes in evolution.

    PubMed

    Craig, C L

    1992-08-01

    Aerial web-weaving spiders display a wide variety of foraging behaviors that can be tied to the evolution of one family of proteins, the silks. In some cases, the physical structure and mechanical properties of silks alone determine the ecology of spiders: the habitats in which they forage, the prey they capture and their subsequent reproductive success. Future studies that integrate research on the physical structure of silks, the molecular genetics of silk synthesis and the foraging ecology of spiders in primitive and derived phylogenetic groups could reveal how molecular and organismal processes interact in evolution.

  16. The meaning and value of traditional occupational practice: a Karen woman's story of weaving in the United States.

    PubMed

    Smith, Yda J; Stephenson, Stephanie; Gibson-Satterthwaite, Michelle

    2013-01-01

    This case study sought to understand the meaning of restoring traditional weaving as an occupation among Karen women from Burma who now live in an urban city in the United States and to examine the impact of weaving on their daily lives in terms of identity, empowerment, social support, and opportunities for entrepreneurship. The story of one Karen woman, Paw Law Eh, is described. Her story exemplifies the negative consequences of restricted access to familiar and meaningful daily activities, or "occupations", the relationship between occupation and self-identity, how participation in valued occupations can enhance social networks, and the restorative effects that are possible when engagement in meaningful occupations are maintained or restored. Her story demonstrates that occupational therapists have the skills and opportunity to contribute significantly to the well-being of Karen women by supporting the restoration of the occupation of weaving. PMID:23531562

  17. Microstructure and Tensile Properties of BN/SiC Coated Hi-Nicalon, and Sylramic SiC Fiber Preforms. Revised

    NASA Technical Reports Server (NTRS)

    Bhatt, Ramakrishna T.; Chen, Yuan L.; Morscher, Gregory N.

    2002-01-01

    Batch to batch and within batch variations, and the influence of fiber architecture on room temperature physical and tensile properties of BN/SiC coated Hi-Nicalon and Sylramic SiC fiber preform specimens were determined. The three fiber architectures studied were plain weave (PW), 5-harness satin (5HS), and 8-harness satin (8HS). Results indicate that the physical properties vary up to 10 percent within a batch, and up to 20 percent between batches of preforms. Load-reload (Hysteresis) and acoustic emission methods were used to analyze damage accumulation occurring during tensile loading. Early acoustic emission activity, before observable hysteretic behavior, indicates that the damage starts with the formation of nonbridged tunnel cracks. These cracks then propagate and intersect the load bearing "0 deg" fibers giving rise to hysteretic behavior. For the Hi-Nicalon preform specimens, the onset of "0 deg" bundle cracking stress and strain appeared to be independent of the fiber architecture. Also, the "0 deg" fiber bundle cracking strain remained nearly the same for the preform specimens of both fiber types. TEM analysis indicates that the CVI BN interface coating is mostly amorphous and contains carbon and oxygen impurities, and the CVI SiC coating is crystalline. No reaction exists between the CVI BN and SiC coating.

  18. Microstructure and Tensile Properties of BN/SiC Coated Hi-Nicalon, and Sylramic SiC Fiber Preforms

    NASA Technical Reports Server (NTRS)

    Bhatt, Ramakrishna T.; Chen, Yuan L.; Morscher, Gregory N.

    2001-01-01

    Batch to batch and within batch variations, and the influence of fiber architecture on room temperature physical and tensile properties of BN/SiC coated Hi-Nicalon and Sylramic SiC fiber preform specimens were determined. The three fiber architectures studied were plain weave (PW), 5-harness satin (5HS) and 8-harness satin (8HS) Results indicate that the physical properties vary up to 10 percent within a batch, and up to 20 percent between batches of preforms. Load-reload (Hysteresis) and acoustic emission methods were used to analyze damage accumulation occurring during tensile loading. Early acoustic emission activity, before observable hysteretic behavior, indicates that the damage starts with the formation of nonbridged tunnel cracks. These cracks then propagate and intersect the load bearing "0" fibers giving rise to hysteretic behavior, For the Hi-Nicalon preform specimens, the onset of "0" bundle cracking stress and strain appeared to be independent of the fiber architecture. Also, the "0" fiber bundle cracking strain remained nearly the same for the preform specimens of both fiber types. Transmission Electron Microscope (TEM) analysis indicates that the Chemical Vapor Infiltration (CVI) Boron Nitride (BN) interface coating is mostly amorphous and contains carbon and oxygen impurities, and the CVI SiC coating is crystalline. No reaction exists between the CVI BN and SiC coating.

  19. Verification and application of the Iosipescu shear test method

    NASA Technical Reports Server (NTRS)

    Walrath, D. E.; Adams, D. F.

    1984-01-01

    Finite element models were used to study the effects of notch angle variations on the stress state within an Iosipescu shear test speciment. These analytical results were also studied to determine the feasibility of using strain gage rosettes and a modified extensometer to measure shear strains in this test specimen. Analytical results indicate that notch angle variations produced only small differences in simulated shear properties. Both strain gage rosettes and the modified extensometer were shown to be feasible shear strain transducers for the test method. The Iosipoescu shear test fixture was redesigned to incorporate several improvements. These improvements include accommodation of a 50 percent larger specimen for easier measurement of shear train, a clamping mechanism to relax strict tolerances on specimen width, and a self contained alignment tool for use during specimen installation. A set of in-plane and interlaminar shear properties were measured for three graphite fabric/epoxy composites of T300/934 composite material. The three weave patterns were Oxford, 5-harness satin, and 8-harness satin.

  20. Modeling Geometry and Progressive Failure of Material Interfaces in Plain Weave Composites

    NASA Technical Reports Server (NTRS)

    Hsu, Su-Yuen; Cheng, Ron-Bin

    2010-01-01

    A procedure combining a geometrically nonlinear, explicit-dynamics contact analysis, computer aided design techniques, and elasticity-based mesh adjustment is proposed to efficiently generate realistic finite element models for meso-mechanical analysis of progressive failure in textile composites. In the procedure, the geometry of fiber tows is obtained by imposing a fictitious expansion on the tows. Meshes resulting from the procedure are conformal with the computed tow-tow and tow-matrix interfaces but are incongruent at the interfaces. The mesh interfaces are treated as cohesive contact surfaces not only to resolve the incongruence but also to simulate progressive failure. The method is employed to simulate debonding at the material interfaces in a ceramic-matrix plain weave composite with matrix porosity and in a polymeric matrix plain weave composite without matrix porosity, both subject to uniaxial cyclic loading. The numerical results indicate progression of the interfacial damage during every loading and reverse loading event in a constant strain amplitude cyclic process. However, the composites show different patterns of damage advancement.

  1. Effect of Weaving Direction of Conductive Yarns on Electromagnetic Performance of 3D Integrated Microstrip Antenna

    NASA Astrophysics Data System (ADS)

    Xu, Fujun; Yao, Lan; Zhao, Da; Jiang, Muwen; Qiu, Yipping

    2013-10-01

    A three-dimensionally integrated microstrip antenna (3DIMA) is a microstrip antenna woven into the three-dimensional woven composite for load bearing while functioning as an antenna. In this study, the effect of weaving direction of conductive yarns on electromagnetic performance of 3DIMAs are investigated by designing, simulating and experimental testing of two microstrip antennas with different weaving directions of conductive yarns: one has the conductive yarns along the antenna feeding direction (3DIMA-Exp1) and the other has the conductive yarns perpendicular the antenna feeding direction (3DIMA-Exp2). The measured voltage standing wave ratio (VSWR) of 3DIMA-Exp1 was 1.4 at the resonant frequencies of 1.39 GHz; while that of 3DIMA-Exp2 was 1.2 at the resonant frequencies of 1.35 GHz. In addition, the measured radiation pattern of the 3DIMA-Exp1 has smaller back lobe and higher gain value than those of the 3DIMA-Exp2. This result indicates that the waving direction of conductive yarns may have a significant impact on electromagnetic performance of textile structural antennas.

  2. The Impact of Ergonomically Designed Workstations on Shoulder EMG Activity during Carpet Weaving

    PubMed Central

    Motamedzade, Majid; Afshari, Davood; Soltanian, Alireza

    2014-01-01

    Background: The present study aimed to evaluate the biomechanical exposure to the trapezius muscle activity in female weavers for a prolonged period in the workstation A (suggested by previous studies) and workstation B (proposed by the present study). Methods: Electromyography data were collected from nine females during four hours for each ergonomically designed workstation at the Ergonomics Laboratory, Hamadan, Iran. The design criteria for ergonomically designed workstations were: 1) weaving height (20 and 3 cm above elbow height for workstations A and B, respectively), and 2) seat type (10° and 0° forwardsloping seat for workstations A and B, respectively). Results: The amplitude probability distribution function (APDF) analysis showed that the left and right upper trapezius muscle activity was almost similar at each workstation. Trapezius muscle activity in the workstation A was signifi­cantly greater than workstations B (P<0.001). Conclusion: In general, use of workstation B leads to significantly reduced muscle activity levels in the upper trapezius as compared to workstation A in weavers. Despite the positive impact of workstation B in reducing trapezius muscle activity, it seems that constrained postures of the upper arm during weaving may be associated with musculoskeletal symptoms. PMID:25650180

  3. Effect of Yarn Distortion on the Mechanical Properties of Fiber-Bar Composites Reinforced by Three-Dimensional Weaving

    NASA Astrophysics Data System (ADS)

    Kang, Huairong; Shan, Zhongde; Zang, Yong; Liu, Feng

    2016-04-01

    A meso-structure model of fiber-bar composites reinforced by three-dimensional weaving (FBCR3DW) is proposed. Optical microscopy images of the preform structure revealed that the fibers along the circumference of the yarn cross-weave were twisted randomly due to alternating yarn winding on either side of the fiber bars during the manufacturing process. Sections of the cross-woven yarn were divided into five regions based on the twist characteristics. Stochastic function theory was used to describe the twist characteristics and to calculate the compliance tensor for each twisted yarn region. The twist characteristics and compliance tensor of each region were then introduced into a finite element model to calculate the elastic properties of the twisted yarn and FBCR3DW; unidirectional tensile stress-strain curves were generated based on the Tsai-Wu failure criterion. Several FBCR3DW specimens with randomly twisted yarns inside the weave structure were used in experimental tests. Our numerical results were in good agreement with the experimental values. Yarn distortion had a significant effect on the elastic properties and axial tensile strength of the yarn; specifically, the influence of yarn distortion on the transverse elastic modulus and transverse shear modulus of FBCR3DW was severe, whereas only a slight effect occurred with regard to the other elastic constants and unidirectional tensile properties. Thus, the proposed method provides an effective reference for modeling fiber composites with a weave structure.

  4. Numerical and experimental investigation of passive rider effects on motorcycle weave

    NASA Astrophysics Data System (ADS)

    Massaro, Matteo; Lot, Roberto; Cossalter, Vittore; Brendelson, James; Sadauckas, James

    2012-01-01

    Despite the importance of rider passive response to the lateral dynamics of motorcycles, there is very little literature on the subject. Even more uncommon are works that consider rider passive steering impedance and its effect on motorcycle stability. Moreover, until this time, there have been no published studies on steering impedance that include correlation to on-road motorcycle stability testing. This paper explores these topics using an advanced motorcycle simulation model which includes rider torso and steering impedance values derived from experimental characterisation and anthropometric modelling. A novel method for quantitatively evaluating on-road stability is discussed and utilised to compare the simulation results to on-road weave stability testing for two different riders in the 'hands-off' and 'hands-on' the handlebars conditions. Good correlation is achieved between simulation and test indicating stability differences between riders and highlighting hands-off/on effects.

  5. Verification of Commercial Motor Performance for WEAVE at the William Herschel Telescope

    NASA Astrophysics Data System (ADS)

    Gilbert, J.; Dalton, G.; Lewis, I.

    2016-10-01

    WEAVE is a 1000-fiber multi-object spectroscopic facility for the 4.2 m William Herschel Telescope. It will feature a double-headed pick-and-place fiber positioning robot comprising commercially available robotic axes. This paper presents results on the performance of these axes, obtained by testing a prototype system in the laboratory. Positioning accuracy is found to be better than the manufacturer's published values for the tested cases, indicating that the requirement for a maximum positioning error of 8.0 microns is achievable. Field reconfiguration times well within the planned 60 minute observation window are shown to be likely when individual axis movements are combined in an efficient way.

  6. Weaving meanings from the deliberative process of collegiate management in nursing1

    PubMed Central

    Higashi, Giovana Dorneles Callegaro; Erdmann, Alacoque Lorenzini

    2014-01-01

    Objective to understand the meanings of the collegiate deliberations attributed by its members on an undergraduate nursing course. Method Grounded Theory, interviews being held with 30 participants, making up 4 sample groups, between January and June 2012, in a public higher education institution. Result 5 categories emerged, indicating the phenomenon and weaving the paradigmatic model: Understanding the experience of the complex relationships and interactions in the deliberations of collegiate management in nursing: intertwining divergences, convergences, dialogs, collectivities and diversities. This deliberative process presents various meanings involving discussion, and divergent, convergent and complementary positions, through dialog, commitment and negotiation. Conclusion the deliberations in the collegiate of nursing, intertwining dialogs, collectivities and diversities, mold the complex relational fabrics. PMID:26107835

  7. Competing dwarf males: sexual selection in an orb-weaving spider.

    PubMed

    Foellmer, M W; Fairbairn, D J

    2005-05-01

    Hypotheses for the adaptive significance of extreme female-biased sexual size dimorphism (SSD) generally assume that in dimorphic species males rarely interfere with each other. Here we provide the first multivariate examination of sexual selection because of male-male competition over access to females in a species with 'dwarf' males, the orb-weaving spider Argiope aurantia. Male A. aurantia typically try to mate opportunistically during the female's final moult when she is defenceless. We show that, contrary to previous hypotheses, the local operational sex ratio (males per female on the web) is male-biased most of the season. Both interference and scramble competition occur during opportunistic mating, the former leading to significant selection for large male body size. Male condition and leg length had no effect on mating success independent of size. We discuss these findings in the context of the evolution of extreme female-biased SSD in this clade.

  8. Loss of legs: is it or not a handicap for an orb-weaving spider?

    PubMed

    Pasquet, Alain; Anotaux, Mylène; Leborgne, Raymond

    2011-07-01

    Leg loss is a common phenomenon in spiders, and according to the species 5% to 40% of the adults can present at least one missing leg. There is no possibility of regeneration after adult moult and the animal must manage with its missing appendages until its death. With the loss of one or more legs, female orb-weaving spiders can be penalized twice: firstly, because the legs are necessary for web construction and secondly, the legs are essential for the control of the prey after its interception by the web. During development, spiders may be also penalized because regeneration has energetic costs that take away resources for survival, growth and reproduction. All these consequences should influence negatively the development of the spider and thus its fitness. We investigated the impact of leg loss in the orb-weaving spider, Zygiella x-notata by studying its frequency in a natural population and web building and prey capture behaviours in laboratory. In field populations, 9.5% to 13%, of the adult females presented the loss of one or more legs; the majority of individuals had lost only one leg (in 48% of cases, a first one). Leg loss seems to affect all the adult spiders, as there is no difference of mass between intact spiders and those with missing leg. Data obtained with laboratory-reared spiders, showed that the loss of legs due to the moult is rare (less than 1%). Considering changes in web design, spiders with missing legs decreased their silk investment, increased the distance between spiral turns but did not change the capture surface of the web. Under our laboratory experimental conditions, spiders with one or two lost legs did not present any difference in prey capture efficiency. In laboratory conditions, spiders with lost leg(s) did not show any difference in egg sac production or in longevity (adult lifespan) compared to intact spiders. PMID:21533554

  9. Loss of legs: is it or not a handicap for an orb-weaving spider?

    NASA Astrophysics Data System (ADS)

    Pasquet, Alain; Anotaux, Mylène; Leborgne, Raymond

    2011-07-01

    Leg loss is a common phenomenon in spiders, and according to the species 5% to 40% of the adults can present at least one missing leg. There is no possibility of regeneration after adult moult and the animal must manage with its missing appendages until its death. With the loss of one or more legs, female orb-weaving spiders can be penalized twice: firstly, because the legs are necessary for web construction and secondly, the legs are essential for the control of the prey after its interception by the web. During development, spiders may be also penalized because regeneration has energetic costs that take away resources for survival, growth and reproduction. All these consequences should influence negatively the development of the spider and thus its fitness. We investigated the impact of leg loss in the orb-weaving spider, Zygiella x-notata by studying its frequency in a natural population and web building and prey capture behaviours in laboratory. In field populations, 9.5% to 13%, of the adult females presented the loss of one or more legs; the majority of individuals had lost only one leg (in 48% of cases, a first one). Leg loss seems to affect all the adult spiders, as there is no difference of mass between intact spiders and those with missing leg. Data obtained with laboratory-reared spiders, showed that the loss of legs due to the moult is rare (less than 1%). Considering changes in web design, spiders with missing legs decreased their silk investment, increased the distance between spiral turns but did not change the capture surface of the web. Under our laboratory experimental conditions, spiders with one or two lost legs did not present any difference in prey capture efficiency. In laboratory conditions, spiders with lost leg(s) did not show any difference in egg sac production or in longevity (adult lifespan) compared to intact spiders.

  10. PEDOT:PSS-Based Piezo-Resistive Sensors Applied to Reinforcement Glass Fibres for in Situ Measurement during the Composite Material Weaving Process

    PubMed Central

    Trifigny, Nicolas; Kelly, Fern M.; Cochrane, Cédric; Boussu, François; Koncar, Vladan; Soulat, Damien

    2013-01-01

    The quality of fibrous reinforcements used in composite materials can be monitored during the weaving process. Fibrous sensors previously developed in our laboratory, based on PEDOT:PSS, have been adapted so as to directly measure the mechanical stress on fabrics under static or dynamic conditions. The objective of our research has been to develop new sensor yarns, with the ability to locally detect mechanical stresses all along the warp or weft yarn. This local detection is undertaken inside the weaving loom in real time during the weaving process. Suitable electronic devices have been designed in order to record in situ measurements delivered by this new fibrous sensor yarn. PMID:23959238

  11. PEDOT:PSS-based piezo-resistive sensors applied to reinforcement glass fibres for in situ measurement during the composite material weaving process.

    PubMed

    Trifigny, Nicolas; Kelly, Fern M; Cochrane, Cédric; Boussu, François; Koncar, Vladan; Soulat, Damien

    2013-08-16

    The quality of fibrous reinforcements used in composite materials can be monitored during the weaving process. Fibrous sensors previously developed in our laboratory, based on PEDOT:PSS, have been adapted so as to directly measure the mechanical stress on fabrics under static or dynamic conditions. The objective of our research has been to develop new sensor yarns, with the ability to locally detect mechanical stresses all along the warp or weft yarn. This local detection is undertaken inside the weaving loom in real time during the weaving process. Suitable electronic devices have been designed in order to record in situ measurements delivered by this new fibrous sensor yarn.

  12. PIP processing, microstructure and properties of Si{sub 3}N{sub 4} fiber and Al{sub 2}O{sub 3} fiber reinforced silicon nitride

    SciTech Connect

    Schwab, S.T.; Page, R.A.; Davidson, D.L.; Graef, R.C.

    1995-10-01

    Polymer infiltration/pyrolysis (PIP) processing has the potential to become an affordable means of manufacturing continuous fiber-reinforced ceramic-matrix components. The PIP method is very similar to the well-known polymer-matrix and carbon-carbon composite manufacturing techniques, the major difference being the use of a preceramic polymer in place of the organic polymer or carbon precursor. To date, the majority of research in the field of preceramic polymers has centered on precursors to silicon carbide (SiC). The Southwest Research institute (SwRI) has focused on the development of polymeric precursors to silicon nitride (Si{sub 3}N{sub 4}) because its high-temperature strength, resistance to oxidation, and other properties make it an attractive candidate for many advanced high-temperature structural applications. PIP Si{sub 3}N{sub 4} composites with NICALON SiC fiber reinforcement have exhibited good fracture toughness (K{sub IC} {approximately} 16 MPa {center_dot} m{sup 1/2}). The authors report here processing, microstructure and preliminary mechanical properties of two new PIP Si{sub 3}N{sub 4} composites. One is reinforced with Tonen Si{sub 3}N{sub 4} fiber (plain weave) while the other is reinforced with ALMAX Al{sub 2}O{sub 3} fiber (8 Harness satin weave).

  13. Women's evaluation of abuse and violence care in general practice: a cluster randomised controlled trial (weave)

    PubMed Central

    2010-01-01

    Background Intimate partner abuse (IPA) is a major public health problem with serious implications for the physical and psychosocial wellbeing of women, particularly women of child-bearing age. It is a common, hidden problem in general practice and has been under-researched in this setting. Opportunities for early intervention and support in primary care need to be investigated given the frequency of contact women have with general practice. Despite the high prevalence and health consequences of abuse, there is insufficient evidence for screening in primary care settings. Furthermore, there is little rigorous evidence to guide general practitioners (GPs) in responding to women identified as experiencing partner abuse. This paper describes the design of a trial of a general practice-based intervention consisting of screening for fear of partner with feedback to GPs, training for GPs, brief counselling for women and minimal practice organisational change. It examines the effect on women's quality of life, mental health and safety behaviours. Methods/Design weave is a cluster randomised controlled trial involving 40 general practices in Victoria, Australia. Approximately 500 women (16-50 years) seen by the GP in the previous year are mailed a short lifestyle survey containing an item to screen for IPA. Women who indicate that they were afraid of a partner/ex-partner in the last year and provide contact details are invited to participate. Once baseline data are collected, GPs are randomly assigned to either a group involving healthy relationship and responding to IPA training plus inviting women for up to 6 sessions of counselling or to a group involving basic education and usual care for women. Outcomes will be evaluated by postal survey at 6 and 12 months following delivery of the intervention. There will be an economic evaluation, and process evaluation involving interviews with women and GPs, to inform understanding about implementation and outcomes. Discussion The

  14. Computer Representation of Fabric Pattern Weaves as Woven Fabric Samples and Texture Maps for Educational and Industrial Applications.

    ERIC Educational Resources Information Center

    Murtha, Judith Rush

    The purpose of this study was to write a computer program that would not only output a color pattern weave to a cathode ray tube (CRT), but would also analyze a painted design and output a printed diagram that would show how to set up a loom in order to produce the woven design. The first of seven chapters describes the problem and the intent of…

  15. Health hazards, injury problems, and workplace conditions of carpet-weaving children in three districts of Punjab, Pakistan.

    PubMed

    Awan, Saeed; Nasrullah, Muazzam; Cummings, Kristin J

    2010-01-01

    Carpet weaving among children is common in rural Pakistan, but little information is available on the health effects of this work. A total of 628 carpet-weaving children and 292 non-working children from 10 rural villages were evaluated with questionnaires and physical exams. Fifty-five home-based and 30 shed-based worksites in these villages were assessed. Girls comprised the majority of working (73%) and non-working (69%) children; the mean age for both boys and girls was 10 years. The mean number of hours worked daily was 7.2 for males and 6.8 for females. Dust exposure in homes was generally higher than in sheds. Working children had significantly greater odds of joint pain (OR = 2.8), dry cough (OR = 2.5), cuts/bruises (OR = 22.1), Phalen's sign (OR = 17.2), and neck/shoulder abnormalities (OR = 14.2). Symptoms and signs of acute and repetitive injury and respiratory symptoms were more common among carpet-weaving children than their non-working peers.

  16. Multi-scale Model of Residual Strength of 2D Plain Weave C/SiC Composites in Oxidation Atmosphere

    NASA Astrophysics Data System (ADS)

    Chen, Xihui; Sun, Zhigang; Sun, Jianfen; Song, Yingdong

    2016-06-01

    Multi-scale models play an important role in capturing the nonlinear response of woven carbon fiber reinforced ceramic matrix composites. In plain weave carbon fiber/silicon carbon (C/SiC) composites, the carbon fibers and interphases will be oxidized at elevated temperature and the strength of the composite will be degraded when oxygen enters micro-cracks formed in the as-produced parts due to the mismatch in thermal properties between constituents. As a result of the oxidation on fiber surface, fiber shows a notch-like morphology. In this paper, the change rule of fiber notch depth is fitted by circular function. And a multi-scale model based upon the change rule of fiber notch depth is developed to simulate the residual strength and post-oxidation stress-strain curves of the composite. The multi-scale model is able to accurately predict the residual strength and post-oxidation stress-strain curves of the composite. Besides, the simulated residual strength and post-oxidation stress-strain curves of 2D plain weave C/SiC composites in oxidation atmosphere show good agreements with experimental results. Furthermore, the oxidation time and temperature of the composite are investigated to show their influences upon the residual strength and post-oxidation stress-strain curves of plain weave C/SiC composites.

  17. Mechanical and wet tribological properties of carbon fabric/phenolic composites with different weave filaments counts

    NASA Astrophysics Data System (ADS)

    Wenbin, Li; Jianfeng, Huang; Jie, Fei; Liyun, Cao; Chunyan, Yao

    2015-10-01

    Carbon fabric/phenolic composites with different weave filaments counts were prepared by dip-coating and hot-press techniques, and then their mechanical and wet tribological properties were investigated based on the analysis of the three-dimensional surface profiles and the pore structures. Results show that the mechanical properties (elastic modulus, flexural modulus, tensile modulus, flexural strength and tensile strength) of the 3K carbon fabric/phenolic composites (Composite A) are better than that of the 12K carbon fabric/phenolic composites (Composite B). Fractured surfaces observation suggests that the dominant tensile failure mechanism is fiber breakage for Composite A and matrix fracture for Composite B. Compared with Composite B, Composite A possesses high friction coefficient in different loads and at different sliding speeds, and the friction coefficient of Composite A is more sensitive to load and sliding speed. The wear rate of Composite B is 39% greater than that of Composite A and the wear features of worn surfaces demonstrate the excellent wear resistance for Composite A. Based on the observation of worn surface, the wear mechanisms are presented.

  18. Monitoring of cotton dust and health risk assessment in small-scale weaving industry.

    PubMed

    Tahir, Muhammad Wajid; Mumtaz, Muhammad Waseem; Tauseef, Shanza; Sajjad, Muqadas; Nazeer, Awais; Farheen, Nazish; Iqbal, Muddsar

    2012-08-01

    The present study describes the estimation of particulate matter (cotton dust) with different sizes, i.e., PM(1.0), PM(2.5), PM(4.0), and PM(10.0 μm) in small-scale weaving industry (power looms) situated in district Hafizabad, Punjab, Pakistan, and the assessment of health problems of workers associated with these pollutants. A significant difference was found in PM(1.0), PM(2.5), PM(4.0), and PM(10.0) with reference to nine different sampling stations with p values <0.05. Multiple comparisons of particulate matter with respect to size, i.e. PM(1.0), PM(2.5), PM(4.0), and PM(10.0), depict that PM(1.0) differs significantly from PM(2.5), PM(4.0), and PM(10.0), with p values <0.05 and that PM(2.5) differs significantly from PM(1.0) and PM(10.0), with p values <0.05, whereas PM(2.5) differs non-significantly from PM(4.0), with a p value >0.05 in defined sampling stations on an average basis. Majority of the workers were facing several diseases due to interaction with particulate matter (cotton dust) during working hours. Flue, cough, eye, and skin infections were the most common diseases among workers caused by particulate matter (cotton dust).

  19. Spontaneous male death during copulation in an orb-weaving spider.

    PubMed Central

    Foellmer, Matthias W; Fairbairn, Daphne J

    2003-01-01

    Males of some cannibalistic species of spiders and insects appear to sacrifice themselves by allowing the female to eat them, and the adaptive significance of such drastic terminal reproductive investment has recently been demonstrated for a spider. Typically, the female has to kill the male, but it has been suggested that males of some species in the cannibalistic orb-weaving spider genus Argiope may die in copula without female 'collaboration'. Here, we provide the first experimental evidence to our knowledge of programmed sudden death after onset of copulation in males of the spider Argiope aurantia. Our observations reveal that males invariably die during the insertion of their second pedipalp, regardless of whether they mate with newly moulted, defenceless females or with older mature females that often attack them. We determined experimentally that the death of males is triggered immediately upon insertion of the second palp, when males become unresponsive, and heartbeat ceases within minutes of insertion. We discuss the possible adaptive significance of programmed death during copulation, and argue that male death has evolved in a context other than sexual cannibalism. PMID:14667377

  20. Unraveling the mechanical properties of composite silk threads spun by cribellate orb-weaving spiders.

    PubMed

    Blackledge, Todd A; Hayashi, Cheryl Y

    2006-08-01

    Orb-web weaving spiders depend upon the mechanical performance of capture threads to absorb the energy of flying prey. Most orb-weavers spin wet capture threads with core fibers of flagelliform silk. These threads are extremely compliant and extensible due to the folding of their constituent proteins into molecular nanosprings and hydration by a surrounding coating of aqueous glue. In contrast, other orb-weavers use cribellate capture threads, which are composite structures consisting of core fibers of pseudoflagelliform silk surrounded by a matrix of fine dry cribellar fibrils. Based on phylogenetic evidence, cribellate capture threads predate the use of viscid capture threads. To better characterize how pseudoflagelliform and cribellar fibrils function, we investigated the mechanical performance of cribellate capture threads for three genera of spiders (Deinopis, Hyptiotes and Uloborus). These taxa spin very diverse web architectures, ranging from complete orbs to evolutionarily reduced triangle webs and cast nets. We found that the pseudoflagelliform core fibers of these webs were stiffer and stronger, but also less extensible, than flagelliform silk. However, cribellate capture threads achieved overall high extensibilities because the surrounding cribellar fibrils contributed substantially to the tensile performance of threads long after the core pseudoflagelliform fibers ruptured. In the case of Deinopis capture threads, up to 90% of the total work performed could be attributed to these fibrils. These findings yield insight into the evolutionary transition from cribellate to viscid capture threads.

  1. Partitioning of niches among four species of orb-weaving spiders in a grassland habitat.

    PubMed

    Richardson, M L; Hanks, L M

    2009-06-01

    Partitioning of niches can play an important role in structuring faunal communities. We tested the hypothesis that differences between four species of orb-weaving spiders (Araneidae) in body size and the structure and position of their webs resulted in their partitioning the available prey. The study species are sympatric in a grassland habitat and included Argiope trifasciata (Forskål), Cyclosa turbinata (Walckenaer), Mangora gibberosa (Hentz), and Neoscona arabesca (Walckenaer). The spider species differed in body size, web diameter, height of web above the ground, spacing of mesh within webs, and the type of plant to which the web was attached. The spider species had a generalist diet and captured prey of multiple trophic levels. Nevertheless, the hypothesis was supported: the spider species differed in the types of prey that they captured. Partitioning of the available prey was influenced by body size, with larger spiders capturing larger prey, but not by the structure or position of their webs. Differences between spider species in niche may reduce competitive interactions and allow them to coexist in sympatry.

  2. Adhesive recruitment by the viscous capture threads of araneoid orb-weaving spiders.

    PubMed

    Opell, Brent D; Hendricks, Mary L

    2007-02-01

    The sticky prey capture threads of orb-webs are critical to web performance. By retaining insects that strike the web, these spirally arrayed threads allow a spider time to locate and subdue prey. The viscous capture threads spun by modern orb-weaving spiders of the Araneoidea clade replaced the dry, fuzzy cribellar capture threads of the Deinopoidea and feature regularly spaced moist, adhesive droplets. The stickiness of a cribellar thread is limited by its tendency to peel from a surface after the adhesion generated at the edges of contact is exceeded. In this study we test the hypothesis that viscous thread overcomes this limitation by implementing a suspension bridge mechanism (SBM) that recruits the adhesion of multiple thread droplets. We do so by using contact plates of four widths to measure the stickiness of six species' viscous threads whose profiles range from small, closely spaced droplets to large, widely spaced droplets. The increased stickiness registered by an increased number of thread droplets supports the operation of a SBM. However, the accompanying decrease in mean per droplet adhesion shows that droplets interior to the edges of thread contact contribute successively less adhesion. Models developed from these data suggest that the suspension bridge mechanism is limited to a span of approximately 12 droplets.

  3. An investigation to determine the producibility of a 3-D braider and bias direction weaving loom

    NASA Technical Reports Server (NTRS)

    Huey, Cecil O., Jr.

    1991-01-01

    The development of prototype machines for the production of generalized braid patterns is described. Mechanical operating principles and control strategies are presented for two prototype machines which were fabricated and evaluated. Both machines represent advances over current techniques for forming composite material preforms by enabling near ideal control of fiber orientation. Furthermore, they overcome both the lack of general control of produced fiber architectures and the complexity of other weaving processes that were produced for the same purpose. One prototype, the modified Farley braider, consists of an array of turntables which can be rotated 90 degrees and returned; hence, they can form tracks in the x and y axis. Yarn ends are transported about the surface formed by the turntables using motorized tractors. These tractors are controlled using an optical link with a control circuit and host computer. The tractors are powered through electrical contact with the turntables. The necessary relative motions are produced by a series of linear tractor moves combined with a sequence of turntable rotations. The movement of the tractors about the surface causes the yarns to produce the desired braiding pattern. The second device, the shuttle plate braider, consists of a braiding surface formed by an array of square elements, each separated from its neighbor by a gap. Beneath this surface lies a shuttle plate, which reciprocates first in one axis and then in the other. As this movement takes place, yarn carrying shuttles engage and disengage the plate by means of solenoid activated pins. By selective engagement and disengagement, the shuttles can move the yarn ends in any desired pattern, forming the desired braid. Control power, and control signals, are transmitted from the electronic interface circuit and host computer, via the braiding surface through electrical contact with the shuttles. Motive power is proved to the shuttles by motion of the shuttle plate

  4. A new giant species of placented worm and the mechanism by which onychophorans weave their nets (Onychophora: Peripatidae).

    PubMed

    Morera-Brenes, Bernal; Monge-Nájera, Julián

    2010-12-01

    Onychophorans, or velvet worms, are poorly known and rare animals. Here we report the discovery of a new species that is also the largest onychophoran found so far, a 22 cm long female from the Caribbean coastal forest of Costa Rica. Specimens were examined with Scanning Electron Microscopy; Peripatus solorzanoi sp. nov., is diagnosed as follows: primary papillae convex and conical with rounded bases, with more than 18 scale ranks. Apical section large, spherical, with a basal diameter of at least 20 ranks. Apical piece with 6-7 scale ranks. Outer blade 1 principal tooth, 1 accessory tooth, 1 vestigial accessory tooth (formula: 1/1/1); inner blade 1 principal tooth, 1 accessory tooth, 1 rudimentary accessory tooth, 9 to 10 denticles (formula: 1/1/1/9-10). Accessory tooth blunt in both blades. Four pads in the fourth and fifth oncopods; 4th. pad arched. The previously unknown mechanism by which onychophorans weave their adhesive is simple: muscular action produces a swinging movement of the adhesive-spelling organs; as a result, the streams cross in mid air, weaving the net. Like all onychophorans, P. solorzanoi is a rare species: active protection of the habitat of the largest onychophoran ever described, is considered urgent. PMID:21246983

  5. A new giant species of placented worm and the mechanism by which onychophorans weave their nets (Onychophora: Peripatidae).

    PubMed

    Morera-Brenes, Bernal; Monge-Nájera, Julián

    2010-12-01

    Onychophorans, or velvet worms, are poorly known and rare animals. Here we report the discovery of a new species that is also the largest onychophoran found so far, a 22 cm long female from the Caribbean coastal forest of Costa Rica. Specimens were examined with Scanning Electron Microscopy; Peripatus solorzanoi sp. nov., is diagnosed as follows: primary papillae convex and conical with rounded bases, with more than 18 scale ranks. Apical section large, spherical, with a basal diameter of at least 20 ranks. Apical piece with 6-7 scale ranks. Outer blade 1 principal tooth, 1 accessory tooth, 1 vestigial accessory tooth (formula: 1/1/1); inner blade 1 principal tooth, 1 accessory tooth, 1 rudimentary accessory tooth, 9 to 10 denticles (formula: 1/1/1/9-10). Accessory tooth blunt in both blades. Four pads in the fourth and fifth oncopods; 4th. pad arched. The previously unknown mechanism by which onychophorans weave their adhesive is simple: muscular action produces a swinging movement of the adhesive-spelling organs; as a result, the streams cross in mid air, weaving the net. Like all onychophorans, P. solorzanoi is a rare species: active protection of the habitat of the largest onychophoran ever described, is considered urgent.

  6. NiO-Microflower Formed by Nanowire-weaving Nanosheets with Interconnected Ni-network Decoration as Supercapacitor Electrode.

    PubMed

    Ci, Suqing; Wen, Zhenhai; Qian, Yuanyuan; Mao, Shun; Cui, Shumao; Chen, Junhong

    2015-07-13

    We propose a 'weaving' evolution mechanism, by systematically investigating the products obtained in controlled experiments, to demonstrate the formation of Ni-based 'microflowers' which consists of multiple characteristic dimensions, in which the three dimensional (3D) NiO 'microflower' is constructed by a two-dimensional (2D) nanosheet framework that is derived from weaving one-dimensional (1D) nanowires. We found such unique nanostructures are conducive for the generation of an electrically conductive Ni-network on the nanosheet surface after being exposed to a reducing atmosphere. Our study offers a promising strategy to address the intrinsic issue of poor electrical conductivity for NiO-based materials with significant enhancement of utilization of NiO active materials, leading to a remarkable improvement in the performance of the Ni-NiO microflower based supercapacitor. The optimized Ni-NiO microflower material showed a mass specific capacitance of 1,828 F g(-1), and an energy density of 15.9 Wh kg(-1) at a current density of 0.5 A g(-1). This research not only contributes to understanding the formation mechanism of such 'microflower' structures but also offers a promising route to advance NiO based supercapacitor given their ease of synthesis, low cost, and long-term stability.

  7. Outdoor Education across America: "Weaving the Web." Selected Papers, Activities, and Resources from the 1987 National Outdoor Education Conference (Cortland, New York, October 9-12, 1987).

    ERIC Educational Resources Information Center

    Yerkes, Rita, Comp.; And Others

    Selected through a refereed process from presentations given by speakers at the "1987 Outdoor Education across America: Weaving the Web" Conference, the content represents philosophy, ideas, program activities, and research of outdoor practitioners and leaders across America. The 25 presentations/workshops are summarized under the broad headings…

  8. Micromechanical Modeling of Woven Metal Matrix Composites

    NASA Technical Reports Server (NTRS)

    Bednarcyk, Brett A.; Pindera, Marek-Jerzy

    1997-01-01

    This report presents the results of an extensive micromechanical modeling effort for woven metal matrix composites. The model is employed to predict the mechanical response of 8-harness (8H) satin weave carbon/copper (C/Cu) composites. Experimental mechanical results for this novel high thermal conductivity material were recently reported by Bednarcyk et al. along with preliminary model results. The micromechanics model developed herein is based on an embedded approach. A micromechanics model for the local (micro-scale) behavior of the woven composite, the original method of cells (Aboudi), is embedded in a global (macro-scale) micromechanics model (the three-dimensional generalized method of cells (GMC-3D) (Aboudi). This approach allows representation of true repeating unit cells for woven metal matrix composites via GMC-3D, and representation of local effects, such as matrix plasticity, yarn porosity, and imperfect fiber-matrix bonding. In addition, the equations of GMC-3D were reformulated to significantly reduce the number of unknown quantities that characterize the deformation fields at the microlevel in order to make possible the analysis of actual microstructures of woven composites. The resulting micromechanical model (WCGMC) provides an intermediate level of geometric representation, versatility, and computational efficiency with respect to previous analytical and numerical models for woven composites, but surpasses all previous modeling work by allowing the mechanical response of a woven metal matrix composite, with an elastoplastic matrix, to be examined for the first time. WCGMC is employed to examine the effects of composite microstructure, porosity, residual stresses, and imperfect fiber-matrix bonding on the predicted mechanical response of 8H satin C/Cu. The previously reported experimental results are summarized, and the model predictions are compared to monotonic and cyclic tensile and shear test data. By considering appropriate levels of porosity

  9. Organ weaving: woven threads and sheets as a step towards a new strategy for artificial organ development.

    PubMed

    Liberski, Albert R; Delaney, Joseph T; Schäfer, Hendrik; Perelaer, Jolke; Schubert, Ulrich S

    2011-11-10

    The concept of "organ weaving" is presented, a fabrication technique that can be an attractive option for the development of artificial tissues and organs. "Living threads" are created by immersing threads that are soaked in a CaCl(2) solution into a sodium-alginate-loaded cell suspension bath, encapsulating the cells and creating a bio-friendly, easily manageable starting material for building up larger scaffold structures. Such living threads have the advantage of being a particularly mild culturing medium for mammalian cells, protecting the cells during subsequent processing steps from dehydration and other rapid changes in the chemistry of the surrounding environment. Connecting different types of threads into 3D objects gives unique opportunities to address tissue engineering challenges.

  10. Body-mass-dependent cost of web-building behavior in an orb weaving spider, Zygiella x-notata.

    PubMed

    Venner, Samuel; Bel-Venner, Marie-Claude; Pasquet, Alain; Leborgne, Raymond

    2003-06-01

    In numerous spider species, reproductive success of adult females has been shown to be positively correlated with their body mass. We suggest, however, that spiders may incur greater foraging costs as their body mass increases due to the numerous and complex locomotor bouts needed to build an orb-web. Such a body-mass-dependent cost should, in turn, affect the web-building decisions of spiders. In the laboratory, we tested the influence of body mass on energetic expenditure (measured as mass loss) during web-building behavior in Zygiella x-notata. Our results showed (1) that energetic costs associated with web-building were closely related to body mass and to web-building activity, and (2) that as their body mass increased, spiders reduced the amount of silk used per web, while their foraging effort simultaneously increased. This work gives new insights into web-building behavior and energy allocation strategies of weaving spiders.

  11. Adhesive compatibility of cribellar and viscous prey capture threads and its implication for the evolution of orb-weaving spiders.

    PubMed

    Opell, Brent D; Tran, Andrew M; Karinshak, Shannon E

    2011-07-01

    Evolution of orb-weaving spiders that comprise the Orbiculariae clade involved a transition in the composition of prey capture thread that has been challenging to explain. The primitive cribellar threads spun by members of the Deinopoidea subclade resemble the capture threads of their non-orb-web-weaving ancestors and are formed of thousands of fine, dry, protein cribellar fibrils. In contrast, the derived viscous capture threads spun by members of the Araneoidea subclade have regularly spaced, aqueous adhesive droplets. When second instar deinopoid spiderlings emerge from egg sacs they are unable to spin cribellar threads, and, therefore, do not construct orb-webs; whereas second instar araneoids spin capture threads and construct orb-webs. If, as we hypothesize, viscous material evolved to enable second instar spiderlings to construct orb-webs, early araneoids may have spun composite cribellar-viscous capture threads. To examine the functional feasibility of such intermediate capture threads, we compared the adhesion of cribellar threads, viscous threads, and combined cribellar-viscous threads. The stickiness of these combined threads was greater than that of native cribellar or viscous threads alone. The viscous material of Araneus marmoreus threads exhibited a substantial increase in stickiness when combined with cribellar fibrils and that of Argiope aurantia threads a small increase in stickiness when combined with cribellar fibrils. Thus, if early araneoids retained their ability to spin cribellar threads after having evolved glands that produced viscous material, their composite threads could have formed a functional adhesive system that achieved its stickiness at no loss of material economy.

  12. PDF Weaving - Linking Inventory Data and Monte Carlo Uncertainty Analysis in the Study of how Disturbance Affects Forest Carbon Storage

    NASA Astrophysics Data System (ADS)

    Healey, S. P.; Patterson, P.; Garrard, C.

    2014-12-01

    Altered disturbance regimes are likely a primary mechanism by which a changing climate will affect storage of carbon in forested ecosystems. Accordingly, the National Forest System (NFS) has been mandated to assess the role of disturbance (harvests, fires, insects, etc.) on carbon storage in each of its planning units. We have developed a process which combines 1990-era maps of forest structure and composition with high-quality maps of subsequent disturbance type and magnitude to track the impact of disturbance on carbon storage. This process, called the Forest Carbon Management Framework (ForCaMF), uses the maps to apply empirically calibrated carbon dynamics built into a widely used management tool, the Forest Vegetation Simulator (FVS). While ForCaMF offers locally specific insights into the effect of historical or hypothetical disturbance trends on carbon storage, its dependence upon the interaction of several maps and a carbon model poses a complex challenge in terms of tracking uncertainty. Monte Carlo analysis is an attractive option for tracking the combined effects of error in several constituent inputs as they impact overall uncertainty. Monte Carlo methods iteratively simulate alternative values for each input and quantify how much outputs vary as a result. Variation of each input is controlled by a Probability Density Function (PDF). We introduce a technique called "PDF Weaving," which constructs PDFs that ensure that simulated uncertainty precisely aligns with uncertainty estimates that can be derived from inventory data. This hard link with inventory data (derived in this case from FIA - the US Forest Service Forest Inventory and Analysis program) both provides empirical calibration and establishes consistency with other types of assessments (e.g., habitat and water) for which NFS depends upon FIA data. Results from the NFS Northern Region will be used to illustrate PDF weaving and insights gained from ForCaMF about the role of disturbance in carbon

  13. Weaving versus blending: a quantitative assessment of the information carrying capacities of two alternative methods for conveying multivariate data with color.

    PubMed

    Hagh-Shenas, Haleh; Kim, Sunghee; Interrante, Victoria; Healey, Christopher

    2007-01-01

    In many applications, it is important to understand the individual values of, and relationships between, multiple related scalar variables defined across a common domain. Several approaches have been proposed for representing data in these situations. In this paper we focus on strategies for the visualization of multivariate data that rely on color mixing. In particular, through a series of controlled observer experiments, we seek to establish a fundamental understanding of the information-carrying capacities of two alternative methods for encoding multivariate information using color: color blending and color weaving. We begin with a baseline experiment in which we assess participants' abilities to accurately read numerical data encoded in six different basic color scales defined in the L*a*b* color space. We then assess participants' abilities to read combinations of 2, 3, 4 and 6 different data values represented in a common region of the domain, encoded using either color blending or color weaving. In color blending a single mixed color is formed via linear combination of the individual values in L*a*b* space, and in color weaving the original individual colors are displayed side-by-side in a high frequency texture that fills the region. A third experiment was conducted to clarify some of the trends regarding the color contrast and its effect on the magnitude of the error that was observed in the second experiment. The results indicate that when the component colors are represented side-by-side in a high frequency texture, most participants' abilities to infer the values of individual components are significantly improved, relative to when the colors are blended. Participants' performance was significantly better with color weaving particularly when more than 2 colors were used, and even when the individual colors subtended only 3 minutes of visual angle in the texture. However, the information-carrying capacity of the color weaving approach has its limits. We

  14. Urbanisation at Multiple Scales Is Associated with Larger Size and Higher Fecundity of an Orb-Weaving Spider

    PubMed Central

    Lowe, Elizabeth C.; Wilder, Shawn M.; Hochuli, Dieter F.

    2014-01-01

    Urbanisation modifies landscapes at multiple scales, impacting the local climate and changing the extent and quality of natural habitats. These habitat modifications significantly alter species distributions and can result in increased abundance of select species which are able to exploit novel ecosystems. We examined the effect of urbanisation at local and landscape scales on the body size, lipid reserves and ovary weight of Nephila plumipes, an orb weaving spider commonly found in both urban and natural landscapes. Habitat variables at landscape, local and microhabitat scales were integrated to create a series of indexes that quantified the degree of urbanisation at each site. Spider size was negatively associated with vegetation cover at a landscape scale, and positively associated with hard surfaces and anthropogenic disturbance on a local and microhabitat scale. Ovary weight increased in higher socioeconomic areas and was positively associated with hard surfaces and leaf litter at a local scale. The larger size and increased reproductive capacity of N.plumipes in urban areas show that some species benefit from the habitat changes associated with urbanisation. Our results also highlight the importance of incorporating environmental variables from multiple scales when quantifying species responses to landscape modification. PMID:25140809

  15. "The story God is weaving us into": narrativizing grief, faith, and infant loss in US evangelical women's blog communities

    NASA Astrophysics Data System (ADS)

    Whitehead, Deborah

    2015-04-01

    This case study explores how US evangelical Christian "mommy blog" communities constitute spaces for the collective memorialization of infant loss. Personal religious blogs feature a rich combination of esthetics, narrative structure, description of religious practices and beliefs, reader interaction, and linked networks. Using a textual approach, I illustrate distinctive features in how pregnancy and infant loss and grief are experienced, shared and memorialized in US women's evangelical blogging communities. I argue that the blog format allows for a (re)narrativization of the devastating experience of infant loss as grieving mothers situate their traumatic personal experiences within the context of an ongoing religious narrative in which blog readers also come to participate. As the blogger tells the story of her own loss to a listening public, it becomes a larger shared story, so that it is not just the child's story but also the author's story, their family's story, and "our story" inclusive of the blog community of readers, "the story God is weaving us into," post by post, day by day. Personal religious blogs and their reading publics, therefore, can provide a medium for the ongoing creation of meaning, faith and community in the context of infant loss.

  16. The influence of varied gravito-inertial fields on the cardiac response of orb-weaving spiders

    NASA Technical Reports Server (NTRS)

    Finck, A.

    1982-01-01

    The Gz transfer function was described for the orb weaving spider A. sericatus. The functional relationship between the heartrate and the intensity of G is linear in the form of: Y = a Log Gz-1 +k. The heartrate in unrestrained animals was recorded by a laser plethysmograph developed specifically for this purpose. Following a control, sample heartrate were taken postrotation between 1.001 and 1.5 Gz in 6 steps. The underlying distribution of heartrates does not appear significantly different from a Gaussian distribution. A method of varnishing the legs of the spider was developed. This was done in order to compromise the lyriform organs, especially those located on the patellae. The lyriform organ is hypothesized to serve the receptor role in the transduction of gravity related stimuli. In preliminary animals the Gz function, post varnishing of the patellae, appears to be changed in the direction of poorer discrimination. We also observed that the resting heartrate following the varnish procedure is substantially increased.

  17. NiO-Microflower Formed by Nanowire-weaving Nanosheets with Interconnected Ni-network Decoration as Supercapacitor Electrode

    NASA Astrophysics Data System (ADS)

    Ci, Suqing; Wen, Zhenhai; Qian, Yuanyuan; Mao, Shun; Cui, Shumao; Chen, Junhong

    2015-07-01

    We propose a ‘weaving’ evolution mechanism, by systematically investigating the products obtained in controlled experiments, to demonstrate the formation of Ni-based ‘microflowers’ which consists of multiple characteristic dimensions, in which the three dimensional (3D) NiO ‘microflower’ is constructed by a two-dimensional (2D) nanosheet framework that is derived from weaving one-dimensional (1D) nanowires. We found such unique nanostructures are conducive for the generation of an electrically conductive Ni-network on the nanosheet surface after being exposed to a reducing atmosphere. Our study offers a promising strategy to address the intrinsic issue of poor electrical conductivity for NiO-based materials with significant enhancement of utilization of NiO active materials, leading to a remarkable improvement in the performance of the Ni-NiO microflower based supercapacitor. The optimized Ni-NiO microflower material showed a mass specific capacitance of 1,828 F g-1, and an energy density of 15.9 Wh kg-1 at a current density of 0.5 A g-1. This research not only contributes to understanding the formation mechanism of such ‘microflower’ structures but also offers a promising route to advance NiO based supercapacitor given their ease of synthesis, low cost, and long-term stability.

  18. Comparative evaluation of woven graphite-epoxy composites

    NASA Technical Reports Server (NTRS)

    Hanagud, S.; Tayebi, A.; Clinton, R. G., Jr.; Nayak, B. M.

    1979-01-01

    A comparative evaluation of some of the mechanical properties of woven graphite-epoxy composites are discussed. In particular, the types of weaves and the resin contents were chosen for comparison. The types of weaves selected are plain weave, satin weave, and tridirectional weave. The composites made of the fabrics are compared to composites made from unidirectional tapes under static and fatigue loading. During static loading, acoustic emission events were monitored. Also, examinations of fracture surfaces and polished sections both away from the fracture surface, and of virgin specimens under an electron microscope are discussed.

  19. Porous ZnO nanosheet arrays constructed on weaved metal wire for flexible dye-sensitized solar cells.

    PubMed

    Dai, Hui; Zhou, Yong; Chen, Liang; Guo, Binglei; Li, Aidong; Liu, Jianguo; Yu, Tao; Zou, Zhigang

    2013-06-01

    Porous zinc oxide (ZnO) nanosheet (NS) arrays constructed by connected nanocrystallites were built on weaved metal wire (WMW) via hydrothermal treatment followed by calcination, and used as photoanodes for flexible dye-sensitized solar cells (DSSCs). An overall light-to-electricity conversion efficiency (η) of 2.70% was achieved for the DSSC under 100 mW cm(-2) illumination, and this η was found to be much higher than that of the DSSC with ZnO nanowire (NW) as the photoanode (0.71%). The far superior performance of the DSSC with ZnO-NS is essentially attributed to: (i) the film consisting of nanosheets with interconnected nanocrystallites can allow relatively direct pathways for the transportation of electrons as the nanosheets have a regular structure with the sheets being oriented to the electrode; (ii) the nanocrystallites assembly and porous character of the nanosheets can provide a large surface area for dye adsorption, which is in favor of enhancing the light absorption and the light propagation; (iii) the nanopores embedded in the nanosheet can act as "branch lines" for more efficient electrolyte diffusion into the interstice of the densely packed nanosheets in the array. A further improvement in the efficiency of the DSSC with ZnO-NS was achieved through the atomic layer deposition (ALD) of an ultrathin titanium oxide (TiO2) layer onto the ZnO-NS layer. The larger charge transfer resistance along with the introduction of a TiO2 shell is thought to reduce the surface recombination and thus contribute to the increase in the open circuit voltage (Voc) of the DSCs and higher conversion efficiency (3.09%).

  20. Pressure Drop Across Woven Screens Under Uniform and Nonuniform Flow Conditions. [flow characteristics of water through Dutch twill and square weave fabrics

    NASA Technical Reports Server (NTRS)

    Ludewig, M.; Omori, S.; Rao, G. L.

    1974-01-01

    Tests were conducted to determine the experimental pressure drop and velocity data for water flowing through woven screens. The types of materials used are dutch twill and square weave fabrics. Pressure drop measures were made at four locations in a rectangular channel. The data are presented as change in pressure compared with the average entry velocity and the numerical relationship is determined by dividing the volumetric flow rate by the screen area open to flow. The equations of continuity and momentum are presented. A computer program listing an extension of a theoretical model and data from that computer program are included.

  1. Statistical Analysis of Yarn Feature Parameters in C/Epoxy Plain-Weave Composite Using Micro CT with High-Resolution Lens-Coupled Detector

    NASA Astrophysics Data System (ADS)

    Wang, Hao; Wang, Zhong-wei

    2016-08-01

    C/Epoxy plain-weave composite is difficult to clear imaging in Micro CT with flat panel detector due to the similar atomic numbers of component materials. To solve this problem, a new Micro CT equipment with high-resolution lens-coupled detector is used to reconstruct 3D images of C/Epoxy. Slice data correction with ellipse projection is used to acquire real yarn normal cross-section information. A reference period method suitable for plain-weave composite is then detailed to evaluate statistical properties of yarn feature parameters. In the process of determination of real extreme slices, dislocation phenomenon existed in the laminated composite is discovered. Several possible reasons caused this phenomenon are discussed. Systematic trends, standard deviations and correlation lengths of stochastic deviations with original and corrected data are evaluated respectively by the application of reference period method. The statistical results show that mean out-of-plane yarn waviness, semi-axes, cross-section area and aspect ratio exhibit periodic characteristics, and the maximum effect of slice data correction on all statistical properties of feature parameters is twist angle.

  2. The Web We Weave.

    ERIC Educational Resources Information Center

    Fisher, Bob

    1995-01-01

    Use of the World Wide Web, a set of connections that organizes the Internet for users, is suggested as one way to enhance college or university information systems. Possible practical applications include student recruitment, alumni relations, media relations, advertisement of institutional specialties, and interactive communications with specific…

  3. Weaving Together Student Supports

    ERIC Educational Resources Information Center

    Benigni, Mark D.; Miller, Bruce A.

    2010-01-01

    Public schools must be the catalyst for achieving equity in education. Real equity is not simply achieving equality or about ensuring that everyone gets the same resources and receives the same instruction. Equity is about ensuring that all students get what they need to be successful. Fairness is not providing the same resources, instruction, and…

  4. Weaving Standards into Learning.

    ERIC Educational Resources Information Center

    Busick, Kathy; Mann, Monica

    This guide provides practical support for teachers as they tackle the challenges of planning and implementing lessons, units, and assessments that energize student learning and progress toward standards. Section 1, "Gathering Materials," provides the basic materials for approaching standards-based learning (definitions of key terms, grade-cluster…

  5. Characterisation of the mechanical and fracture properties of a uni-weave carbon fibre/epoxy non-crimp fabric composite.

    PubMed

    Bru, Thomas; Hellström, Peter; Gutkin, Renaud; Ramantani, Dimitra; Peterson, Göran

    2016-03-01

    A complete database of the mechanical properties of an epoxy polymer reinforced with uni-weave carbon fibre non-crimp fabric (NCF) is established. In-plane and through-the-thickness tests were performed on unidirectional laminates under normal loading and shear loading. The response under cyclic shear loading was also measured. The material has been characterised in terms of stiffness, strength, and failure features for the different loading cases. The critical energy release rates associated with different failure modes in the material were measured from interlaminar and translaminar fracture toughness tests. The stress-strain data of the tensile, compressive, and shear test specimens are included. The load-deflection data for all fracture toughness tests are also included. The database can be used in the development and validation of analytical and numerical models of fibre reinforced plastics (FRPs), in particular FRPs with NCF reinforcements. PMID:26958626

  6. Characterisation of the mechanical and fracture properties of a uni-weave carbon fibre/epoxy non-crimp fabric composite.

    PubMed

    Bru, Thomas; Hellström, Peter; Gutkin, Renaud; Ramantani, Dimitra; Peterson, Göran

    2016-03-01

    A complete database of the mechanical properties of an epoxy polymer reinforced with uni-weave carbon fibre non-crimp fabric (NCF) is established. In-plane and through-the-thickness tests were performed on unidirectional laminates under normal loading and shear loading. The response under cyclic shear loading was also measured. The material has been characterised in terms of stiffness, strength, and failure features for the different loading cases. The critical energy release rates associated with different failure modes in the material were measured from interlaminar and translaminar fracture toughness tests. The stress-strain data of the tensile, compressive, and shear test specimens are included. The load-deflection data for all fracture toughness tests are also included. The database can be used in the development and validation of analytical and numerical models of fibre reinforced plastics (FRPs), in particular FRPs with NCF reinforcements.

  7. Characterisation of the mechanical and fracture properties of a uni-weave carbon fibre/epoxy non-crimp fabric composite

    PubMed Central

    Bru, Thomas; Hellström, Peter; Gutkin, Renaud; Ramantani, Dimitra; Peterson, Göran

    2016-01-01

    A complete database of the mechanical properties of an epoxy polymer reinforced with uni-weave carbon fibre non-crimp fabric (NCF) is established. In-plane and through-the-thickness tests were performed on unidirectional laminates under normal loading and shear loading. The response under cyclic shear loading was also measured. The material has been characterised in terms of stiffness, strength, and failure features for the different loading cases. The critical energy release rates associated with different failure modes in the material were measured from interlaminar and translaminar fracture toughness tests. The stress–strain data of the tensile, compressive, and shear test specimens are included. The load–deflection data for all fracture toughness tests are also included. The database can be used in the development and validation of analytical and numerical models of fibre reinforced plastics (FRPs), in particular FRPs with NCF reinforcements. PMID:26958626

  8. Transply crack density detection by acousto-ultrasonics

    NASA Technical Reports Server (NTRS)

    Hemann, John H.; Bowles, Kenneth J.; Kautz, Harold; Cavano, Paul

    1987-01-01

    The acousto-ultrasonic method was applied to a PMR-15 8-harness, satin Celion 3000 fabric composite to determine the extent of transply cracking. A six-ply 0/90 laminate was also subjected to mechanical loading, which induced transply cracking. The stress wave factor (SWF) is defined as the energy contained in the received signal from a 2.25-MHz center frequency transducer. The correlation of the SWF with transply crack density is shown.

  9. Synthetic spider silk fibers spun from Pyriform Spidroin 2, a glue silk protein discovered in orb-weaving spider attachment discs.

    PubMed

    Geurts, Paul; Zhao, Liang; Hsia, Yang; Gnesa, Eric; Tang, Simon; Jeffery, Felicia; La Mattina, Coby; Franz, Andreas; Larkin, Leah; Vierra, Craig

    2010-12-13

    Spider attachment disc silk fibers are spun into a viscous liquid that rapidly solidifies, gluing dragline silk fibers to substrates for locomotion or web construction. Here we report the identification and artificial spinning of a novel attachment disc glue silk fibroin, Pyriform Spidroin 2 (PySp2), from the golden orb weaver Nephila clavipes . MS studies support PySp2 is a constituent of the pyriform gland that is spun into attachment discs. Analysis of the PySp2 protein architecture reveals sequence divergence relative to the other silk family members, including the cob weaver glue silk fibroin PySp1. PySp2 contains internal block repeats that consist of two subrepeat units: one dominated by Ser, Gln, and Ala and the other Pro-rich. Artificial spinning of recombinant PySp2 truncations shows that the Ser-Gln-Ala-rich subrepeat is sufficient for the assembly of polymeric subunits and subsequent fiber formation. These studies support that both orb- and cob-weaving spiders have evolved highly polar block-repeat sequences with the ability to self-assemble into fibers, suggesting a strategy to allow fiber fabrication in the liquid environment of the attachment discs. PMID:21053953

  10. An occupational health programme for adults and children in the carpet weaving industry, Mirzapur, India: a case study in the informal sector.

    PubMed

    Das, P K; Shukla, K P; Ory, F G

    1992-11-01

    tiles for light improvement in the loom sheds, training of community health volunteers and house-to-house health education. Another essential part of the programme is the provision of functional literacy classes for child and adult labourers in the carpet weaving industry. Occupational health as an entry point proved to be a successful approach in this segment of the informal sector, where child labour plays an important role.

  11. Weaving Geometry and Algebra Together

    ERIC Educational Resources Information Center

    Cetner, Michelle

    2015-01-01

    When thinking about student reasoning and sense making, teachers must consider the nature of tasks given to students along with how to plan to use the tasks in the classroom. Students should be presented with tasks in a way that encourages them to draw connections between algebraic and geometric concepts. This article focuses on the idea that it…

  12. The Weave of the World.

    ERIC Educational Resources Information Center

    Jarrett, Denise

    1999-01-01

    A three-week geometry unit at a Portland (Oregon) middle school integrated mathematics, dance, and visual art. Studying the graphic art of M.C. Escher and the geometric dance patterns of the dance company Pilobolus helped students appreciate the relevance of mathematics to art and life. Students then choreographed brief dances involving geometric…

  13. Weaving Nanotechnology Dreams with Nanotubes

    SciTech Connect

    Tomanek, David

    2003-01-15

    The continuous reduction of device sizes, which is rapidly approaching the atomic level, calls for new approaches to design and test future building blocks of nanotechnology. Computers will become the most powerful tools to interpret what happens on the nanometer scale, where as I will illustrate, structures of carbon may become stronger than steel, yet turn into quantum conductors or even efficient heat conductors. In nanostructures that form during a hierarchical self-assembly process, even defects may play a different, often helpful role. An efficient self-healing process may convert less stable atomic assemblies into other, more perfect structures, thus answering an important concern in molecular electronics. Defects may even be used in nano-scale engineering to form complex systems such as carbon foam or nanotube peapods. I will show how some of these challenging problems can be most efficiently addressed in simulations on recently available massively parallel supercomputers.

  14. Weaving History through the Major

    ERIC Educational Resources Information Center

    Mayfield, Betty

    2014-01-01

    The benefits of including the study of the history of mathematics in the education of mathematics majors have been discussed at length elsewhere. Many colleges and universities now offer a History of Mathematics course for mathematics majors, for mathematics education majors, or for general credit. At Hood College, we emphasize our commitment to…

  15. Analysis of two-dimensional flow of epoxy fluids through woven glass fabric

    SciTech Connect

    Schutz, J.B.; Smith, K.B.

    1997-06-01

    Fabrication of magnet coils for the International Thermonuclear Experimental Reactor will require vacuum pressure impregnation of epoxy resin into the glass fabric of the insulation system. Flow of a fluid through a packed bed of woven glass fabric is extremely complicated, and semiempirical methods must be used to analyze these flows. The previous one-dimensional model has been modified for analysis of two-dimensional isotropic flow of epoxy resins through woven glass fabric. Several two-dimensional flow experiments were performed to validate the analysis, and to determine permeabilities of several fabric weave types. The semiempirical permeability is shown to be a characteristic of the fabric weave, and once determined, may be used to analyze flow of fluids of differing viscosities. Plain weave has a lower permeability than satin weave fabric, possibly due to the increased tortuosity of the preferential flow paths along fiber tows. A flow radius of approximately 2 meters through satin weave fabric is predicted for fluid viscosities of 0.10 Pa s (100 cps) in 20 hours, characteristic of VPI resins.

  16. Low-temperature mechanical properties of glass/epoxy laminates

    NASA Astrophysics Data System (ADS)

    Reed, R. P.; Madhukar, M.; Thaicharoenporn, B.; Martovetsky, N. N.

    2014-01-01

    Selected mechanical properties of glass/epoxy laminate candidates for use in the electrical turn and ground insulation of the ITER Central solenoid (CS) modules were measured. Short-beam shear and flexural tests have been conducted on various E-glass cloth weaves/epoxy laminates at 295 and 77 K. Types of glass weave include 1581, 7500, 7781, and 38050, which represent both satin and plain weaves. The epoxy, planned for use for vacuum-pressure impregnation of the CS module, consists of an anhydride-cured bisphenol F resin system. Inter-laminar shear strength, flexural elastic modulus, and flexural strength have been measured. The data indicate that these properties are dependent on the volume percent of glass. Short-beam shear strength was measured as a function of the span-to-thickness ratio for all laminates at 77 K. Comprehensive fractography was conducted to obtain the failure mode of each short-beam shear test sample.

  17. Predicting the Failure Behavior of Textile Composite Laminates by Using a Multi-Scale Correlating Approach

    NASA Astrophysics Data System (ADS)

    Deng, Yan; Chen, Xiuhua; Wang, Hai

    2015-12-01

    This paper investigates the elastic and failure behavior of textile composite laminates by using an analytical multi-scale correlating approach. The analyses are performed under the four scale levels, i.e. the laminate scale, representative unit cell (RUC) scale, tow architecture scale and fiber/matrix scale levels. The correlation between different scales is derived based on the continuum mechanics and homogenization method from which the stress and strain fields in multiple scales can be obtained concurrently. Effective modulus and ultimate failure strengths of different textile composite (plain weave, twill weave and satin weave) laminates are predicted solely from the corresponding constituent properties, braid geometrical parameters and lay-up. The damage and failure mechanisms at the constituent level are also determined by the micromechanical failure criteria. All the predicted results compare favorably with available experimental data. Parametric studies are also performed to examine the effect of various mechanical and geometrical parameters on the resulting mechanical properties.

  18. Low-temperature mechanical properties of glass/epoxy laminates

    SciTech Connect

    Reed, R. P.; Madhukar, M.; Thaicharoenporn, B.; Martovetsky, N. N.

    2014-01-27

    Selected mechanical properties of glass/epoxy laminate candidates for use in the electrical turn and ground insulation of the ITER Central solenoid (CS) modules were measured. Short-beam shear and flexural tests have been conducted on various E-glass cloth weaves/epoxy laminates at 295 and 77 K. Types of glass weave include 1581, 7500, 7781, and 38050, which represent both satin and plain weaves. The epoxy, planned for use for vacuum-pressure impregnation of the CS module, consists of an anhydride-cured bisphenol F resin system. Inter-laminar shear strength, flexural elastic modulus, and flexural strength have been measured. The data indicate that these properties are dependent on the volume percent of glass. Short-beam shear strength was measured as a function of the span-to-thickness ratio for all laminates at 77 K. Comprehensive fractography was conducted to obtain the failure mode of each short-beam shear test sample.

  19. Intergenerational Programs: Weaving Hearts and Minds.

    ERIC Educational Resources Information Center

    Duggar, Margaret Lynn; And Others

    This publication spotlights the success and diversity of Florida's many intergenerational programs. It describes what intergenerational programming is and the three community needs that intergenerational programs address. Statistics on older persons as well as youth and families in Florida are followed by a listing of what intergenerational…

  20. Weaving Clinical Expertise in Online Health Communities

    PubMed Central

    Huh, Jina; Pratt, Wanda

    2015-01-01

    Many patients visit online health communities to receive support. In face-to-face support groups, health professionals facilitate peer-patients exchanging experience while adding their clinical expertise when necessary. However, the large scale of online health communities makes it challenging for such health professional moderators’ involvement to happen. To address this challenge of delivering clinical expertise to where patients need them, we explore the idea of semi-automatically providing clinical expertise in online health communities. We interviewed 14 clinicians showing them example peer-patient conversation threads. From the interviews, we examined the ideal practice of clinicians providing expertise to patients. The clinicians continuously assessed when peer-patients were providing appropriate support, what kinds of clinical help they could give online, and when to defer to patients’ healthcare providers. The findings inform requirements for building a semi-automated system delivering clinical expertise in online health communities. PMID:26413582

  1. Beyond Earth: Weaving Science and Indigenous Culture

    NASA Astrophysics Data System (ADS)

    Young, Timothy; Guy, M.; Baker-Big Back, C.; Froelich, K.; Munski, L.; Johnson, T.

    2010-01-01

    Beyond Earth is an NSF planning grant designed to engage urban and rural families in science learning while piloting curriculum development and implementation that incorporates both Native and Western epistemologies. Physical, earth, and space science content is juxtaposed with indigenous culture, stories, language and epistemology in after-school programs and teacher training. Project partners include the Dakota Science Center, Fort Berthold Community College, and Sitting Bull College. The Native American tribes represented in this initiative illustrate partnerships between the Dakota, Lakota, Nakota, Hidatsa, Mandan, and Arikara. The primary project deliverables include a culturally responsive curriculum Beyond Earth Moon Module, teacher training workshops, a project website. The curriculum module introduces students to the moon's appearance, phases, and positions in the sky using the Night Sky Planetarium Experience Station to explore core concepts underlying moon phases and eclipses using the interactive Nature Experience Station before engaging in the culminating Mission Challenge in which they apply their knowledge to problem solving situations and projects. The website and developed explorations are presented.

  2. RAS oncogenes: weaving a tumorigenic web

    PubMed Central

    Pylayeva-Gupta, Yuliya; Grabocka, Elda; Bar-Sagi, Dafna

    2013-01-01

    RAS proteins are essential components of signalling pathways that emanate from cell surface receptors. Oncogenic activation of these proteins owing to missense mutations is frequently detected in several types of cancer. A wealth of biochemical and genetic studies indicates that RAS proteins control a complex molecular circuitry that consists of a wide array of interconnecting pathways. In this Review, we describe how RAS oncogenes exploit their extensive signalling reach to affect multiple cellular processes that drive tumorigenesis. PMID:21993244

  3. The Social Weaving of a Reading Atmosphere

    ERIC Educational Resources Information Center

    Sequeiros, Paula

    2011-01-01

    This paper discusses how public library readers in Almeida Garrett, Porto, create a reading atmosphere, focusing on meanings associated with aural conditions. Through a qualitative, single case study, ethnographic and interview techniques were applied. Readers' actual practices and discourses, through a theoretical sample, and those of managers,…

  4. Basket Weaving Inspired by the Gullah

    ERIC Educational Resources Information Center

    Baker, Rita

    2010-01-01

    Many different cultures created and used the basket not only for utilitarian purposes, but also for ceremonial uses. In this article, the author describes an eighth-grade project inspired by the basket making of the Gullah people, who live along the coast of South Carolina, Georgia and Florida.

  5. Theories, relationships and interprofessionalism: learning to weave.

    PubMed

    Hall, Pippa; Weaver, Lynda; Grassau, Pamela Anne

    2013-01-01

    In this article, we illustrate the application of a number of theoretical frameworks we have used to guide our work in interprofessional education (IPE) and collaborative interprofessional care (IPC). Although we do not claim to be experts in any one of these theories, each has offered important insights that have broadened our understanding of the complexities of interprofessional learning and practice. We have gained an appreciation for an increasing number of theories relevant to IPE and IPC, and, as a result, we have woven together more key principles from different theories to develop activities for all levels of interprofessional learners and clinicians. We pay particular attention to relational competencies, knotworking/idea dominance, targeted tension and situational awareness. We are now drawing on the arts and humanities and complexity theory to foster relationship-building learning. Evaluation of our endeavors will eventually follow these latter theories for methods that better match the human and social experiences that underpin learning. Our "theoretical toolbox" therefore may be of value to educators who develop and implement creative interprofessional learning activities, as well as clinicians interested in moving toward more effective collaboration.

  6. Weaving the Web into Course Integrated Instruction.

    ERIC Educational Resources Information Center

    Wallach, Ruth; McCann, Linda

    In the fall 1995, a professor teaching an undergraduate course asked the Reference Center at the University of Southern California to conduct a research session on Dante related resources on the Internet, and to show her students how to search the Dartmouth Dante Project. A simple homepage was created for the class, which listed the course…

  7. Weaving the Gifted into the Full Fabric

    ERIC Educational Resources Information Center

    Smith, Eric J.

    2007-01-01

    In this article, the author talks about some of the challenges facing gifted education today. Here, he talks about some common misconceptions related to what just gifted education means. For example, it is generally thought that education for gifted children is a program separate from the rest of the curriculum. In other words, offerings in gifted…

  8. Beyond DreamWeaving: Honoring Our Connections.

    ERIC Educational Resources Information Center

    Russell, Martha M.

    DreamWeavers listen for the dreams within themselves and within others. The process of career counseling, career management coaching and career/life planning invites practitioners to consistently listen for the dreams, understand that dreams are visions and that visions guide us to action. This paper highlights how career practitioners are called…

  9. Weaving a Stronger Fabric for Improved Outcomes

    ERIC Educational Resources Information Center

    Lobry de Bruyn, Lisa; Prior, Julian; Lenehan, Jo

    2014-01-01

    Purpose: To explain how training and education events (TEEs) can be designed to increase the likelihood of achieving behavioural objectives. Approach: The approach combined both a quantitative review of evaluation surveys undertaken at the time of the TEE, and qualitative telephone interviews with selected attendees (2025% of the total population…

  10. Literary Weavings: Extending Response through the Arts.

    ERIC Educational Resources Information Center

    Johnson, Nancy J.

    1997-01-01

    Describes how students in an undergraduate children's literature class constructed and created interpretations of the books they were reading. Notes that the students each designed a three-foot paper strip reflecting his or her personal response to the book. Finds fresh thinking, fewer repeated ideas, and more understanding of symbol, metaphor,…

  11. Weaving Multicultural Literature into Middle School Curricula

    ERIC Educational Resources Information Center

    Landt, Susan M.

    2007-01-01

    Middle school students are acutely aware of their social surroundings. In the process of emerging from childhood they attentively observe one another, looking for clues to belonging. Striving for independence from adult authority, young adolescents endeavor to blend in with their contemporaries. From clothes to music, from posture to attitude,…

  12. Stress and failure analysis of textile composites using a global/local finite element method. Ph.D. Thesis

    SciTech Connect

    Woo, K.

    1993-01-01

    Textile composites are known to have improved out-of-plane properties and impact resistance. However, detailed analysis of textile composites is very difficult to perform due to the geometric complexity. In the present study, a practical computational procedure based on a global/local finite element method was developed for detailed analysis of textile composites. This procedure utilizes two problem levels: global and local levels. At the global level, an initial solution was obtained using a coarse global mesh. At the local level, a small portion of the textile composite was refined in a local mesh and analyzed in a great detail. In this study, single-field and multi-field macro elements were used in the global analysis. The macro elements are defined herein to be elements with microstructure within each element. Both the conventional finite element method and the global/local finite element method with macro elements were used to study the variation of effective properties and failure behavior of plain weave and satin weave textile composites. Results indicated that the global/local procedure was very efficient for the detailed analysis of the textile composites. The use of macro elements in the global mesh predicted the global response well and the detailed local stress distribution was obtained by the refined local mesh with discrete material modeling. With a small loss of accuracy, the global/local procedure was able to provide a reasonable solution where the conventional finite element analysis was not possible due to huge computer resource requirements. The effective properties of plain weave and satin weave textile composites were dependent on waviness. The effective properties also showed strong dependency on the number of layers. Quick convergence was obtained, however, as the number of layers increased. The stress and failure index distribution of thin plain weave textile composites were different from that of thick plain weave textile composites.

  13. Ballistic damage in hybrid composite laminates

    NASA Astrophysics Data System (ADS)

    Phadnis, Vaibhav A.; Pandya, Kedar S.; Naik, Niranjan K.; Roy, Anish; Silberschmidt, Vadim V.

    2015-07-01

    Ballistic damage of hybrid woven-fabric composites made of plain-weave E-glass- fabric/epoxy and 8H satin-weave T300 carbon-fabric/epoxy is studied using a combination of experimental tests, microstructural studies and finite-element (FE) analysis. Ballistic tests were conducted with a single-stage gas gun. Fibre damage and delamination were observed to be dominating failure modes. A ply-level FE model was developed, with a fabric-reinforced ply modelled as a homogeneous orthotropic material with capacity to sustain progressive stiffness degradation due to fibre/matrix cracking, fibre breaking and plastic deformation under shear loading. Simulated damage patterns on the front and back faces of fabric-reinforced composite plates provided an insight into their damage mechanisms under ballistic loading.

  14. Weavability of dry polymer powder towpreg

    NASA Technical Reports Server (NTRS)

    Hugh, Maylene K.; Marchello, Joseph M.; Maiden, Janice R.; Johnston, Norman J.

    1993-01-01

    Carbon fiber yarns (3k, 6k, 12k) were impregnated with LARC (tm) thermoplastic polyimide dry powder. Parameters for weaving these yarns were established. Eight-harness satin fabrics were successfully woven from each of the three classes of yarns and consolidated into test specimens to determine mechanical properties. It was observed that for optimum results warp yarns should have flexural rigidities between 10,000 and 100,000 mg-cm. Tow handling minimization, low tensioning, and tow bundle twisting were used to reduce fiber breakage, the separation of filaments, and tow-to-tow abrasion. No apparent effect of tow size or twist was observed on either tension or compression modulus. However, fiber damage and processing costs favor the use of 12k yarn bundles versus 3k or 6k yarn bundles in the weaving of powder-coated towpreg.

  15. Ethynylated aromatics as high temperature matrix resins

    NASA Technical Reports Server (NTRS)

    Hurwitz, F. I.

    1987-01-01

    Difunctional and trifunctional arylacetylenes were used as monomers to form thermoset matrix resin composites. Composites can be hot-pressed at 180 C to react 80 percent of the acetylene groups. Crosslinking is completed by postcuring at 350 C. The postcured resins are thermally stable to nominally 460 C in air. As a result of their high crosslink density, the matrix exhibits brittle failure when uniaxial composites are tested in tension. Failure of both uniaixial tensile and flexural specimens occurs in shear at the fiber-matrix interface. Tensile fracture stresses for 0-deg composites fabricated with 60 v/o Celion 6K graphite fiber were 827 MPa. The strain to failure was 0.5 percent. Composites fabricated with 8 harness satin Celion cloth (Fiberite 1133) and tested in tension also failed in shear at tensile stresses of 413 MPa.

  16. Failure mechanisms of woven carbon and glass composites

    SciTech Connect

    Alif, N.; Carlsson, L.A.

    1997-12-31

    Stress-strain responses in tension, compression, and shear of a five-harness satin-weave carbon/epoxy composite and a four-harness satin-weave glass/epoxy composite have been examined. Damage progression under tension was examined by optical microscopic inspection of the polished edges of the specimens. Models for elastic property and failure predictions of woven-fabric composites were examined and correlated with the experimental data. Damage inspection of the carbon/epoxy composite under tension revealed that the initial failure was cracking of pure matrix regions followed by transverse bundle cracking. Fill/weft debonding and longitudinal splits of the fill bundles occurred close to ultimate failure of the composite. The glass/epoxy composite displayed damage in the form of fill/weft debonding and longitudinal splits, but no transverse yarn cracking. The damage observed in both composites was confined to the region where ultimate failure occurred. Elastic properties of the composites were overall in good agreement with micromechanical predictions based on uniform strain, but failure stress predictions were less accurate.

  17. Mechanical Characterization and Micromechanical Modeling of Woven Carbon/Copper Composites

    NASA Technical Reports Server (NTRS)

    Bednarcyk, Brett A.; Pindera, Marek-Jerzy; Ellis, David L.; Miner, Robert V.

    1997-01-01

    The present investigation examines the in-plane mechanical behavior of a particular woven metal matrix composite (MMC); 8-harness (8H) satin carbon/copper (C/Cu). This is accomplished via mechanical testing as well as micromechanical modeling. While the literature is replete with experimental and modeling efforts for woven and braided polymer matrix composites, little work has been done on woven and braided MMC's. Thus, the development and understanding of woven MMC's is at an early stage. 8H satin C/Cu owes its existence to the high thermal conductivity of copper and low density and thermal expansion of carbon fibers. It is a candidate material for high heat flux applications, such as space power radiator panels. The experimental portion of this investigation consists of monotonic and cyclic tension, compression, and Iosipescu shear tests, as well as combined tension-compression tests. Tests were performed on composite specimens with three copper matrix alloy types: pure Cu, Cu-0.5 weight percent Ti (Cu-Ti), and Cu-0.7 weight percent Cr (Cu-Cr). The small alloying additions are present to promote fiber/matrix interfacial bonding. The analytical modeling effort utilizes an approach in which a local micromechanical model is embedded in a global micromechanical model. This approach differs from previously developed analytical models for woven composites in that a true repeating unit cell is analyzed. However, unlike finite element modeling of woven composites, the geometry is sufficiently idealized to allow efficient geometric discretization and efficient execution.

  18. Weaving Culture and Core Content into FLEX Programs

    ERIC Educational Resources Information Center

    Schultz, Kennedy M.

    2012-01-01

    While immersion programs provide some of the greatest benefits to children learning a new language, many school systems have yet to dedicate the financial and personnel resources necessary to plan and implement such programs on a wide scale. In areas where immersion or formal FLES programming does not exist in the schools, often opportunities to…

  19. Weaving a Virtual Story--Creating Book Trailers 101

    ERIC Educational Resources Information Center

    Bates, Naomi

    2012-01-01

    Book trailers are fast becoming today's marketing technique for newly published books. They have changed the way students select books, and trailers meet the expectations of today's teens who have been brought up on graphic visuals. Book trailers are also quite new, starting as a trend only about four years ago. Since then, they have proliferated,…

  20. States Seek High School Pathways Weaving Academic, Career Options

    ERIC Educational Resources Information Center

    Sawchuk, Stephen

    2013-01-01

    Every student at Wheeling High School takes a full academic courseload. Many of the graduates of this 2,000-student school in Wheeling, Illinois, however, also emerge with significant experience in a career field. Those interested in health careers, for example, can work with student-athletes in the school's athletic training facility, earn a…

  1. Weaving a Virtual Web: Practical Approaches to New Information Technologies.

    ERIC Educational Resources Information Center

    Gruber, Sibylle, Ed.

    With sections on using the Web to plan and structure courses, conduct research, and publish student work, as well as a reference essay that reviews Web sites for educators and students, this book reveals the rich variety of ways in which this technology can be used by English and language arts teachers at all levels. The 20 essays in the book…

  2. Masters of Weaving: The Complex Role of Special Education Teachers

    ERIC Educational Resources Information Center

    Hillel Lavian, Rivka

    2015-01-01

    Special education teachers work under more difficult, more intense, and more demanding conditions than mainstream teachers. Relations between teachers, pupils, and parents are more complex than in mainstream education due to the intensity, intimacy, vulnerability, and commitment involved. Teachers require special skills so they can practice…

  3. Weaving Social Foundations through Dance Pedagogy: A Pedagogy of Uncovering

    ERIC Educational Resources Information Center

    Barr, Sherrie; Risner, Doug

    2014-01-01

    Today's dance educators enter classrooms populated by increasingly diverse students in which teachers' pedagogical knowledge necessitates heightened understandings of race, ethnicity, social class, gender, and sexuality. Uncovering taken-for-granted assumptions, dominant stereotypes, and educational structures that reproduce social…

  4. Weaving Authenticity and Legitimacy: Latina Faculty Peer Mentoring

    ERIC Educational Resources Information Center

    Núñez, Anne-Marie; Murakami, Elizabeth T.; Gonzales, Leslie D.

    2015-01-01

    As an alternative to typical top-down mentoring models, the authors advance a conception of peer mentoring that is based on research about collectivist strategies that Latina faculty employ to navigate the academy. The authors advance recommendations for institutional agents to support mentoring for faculty who are members of historically…

  5. Beyond Basket Weaving: Multicultural Education and Whole-School Reform.

    ERIC Educational Resources Information Center

    May, Stephen A.

    This paper outlines the various limitations of several multicultural education initiatives and explores the conditions necessary for making multicultural education actually work. The conditions examined include the centrality of first language maintenance and the reconstituting of curriculum, pedagogy, evaluation, and organization at the school…

  6. Weaving multi-layer fabrics for reinforcement of engineering components

    NASA Technical Reports Server (NTRS)

    Hill, B. J.; Mcilhagger, R.; Mclaughlin, P.

    1993-01-01

    The performance of interlinked, multi-layer fabrics and near net shape preforms for engineering applications, woven on a 48 shaft dobby loom using glass, aramid, and carbon continuous filament yarns is assessed. The interlinking was formed using the warp yarns. Two basic types of structure were used. The first used a single warp beam and hence each of the warp yarns followed a similar path to form four layer interlinked reinforcements and preforms. In the second two warp beams were used, one for the interlinking yarns which pass from the top to the bottom layer through-the-thickness of the fabric and vice versa, and the other to provide 'straight' yarns in the body of the structure to carry the axial loading. Fabrics up to 15mm in thickness were constructed with varying amounts of through-the-thickness reinforcement. Tapered T and I sections were also woven, with the shaping produced by progressive removal of ends during construction. These fabrics and preforms were impregnated with resin and cured to form composite samples for testing. Using these two basic types of construction, the influence of reinforcement construction and the proportion and type of interlinking yarn on the performance of the composite was assessed.

  7. Quantum information processing by weaving quantum Talbot carpets

    NASA Astrophysics Data System (ADS)

    Farías, Osvaldo Jiménez; de Melo, Fernando; Milman, Pérola; Walborn, Stephen P.

    2015-06-01

    Single-photon interference due to passage through a periodic grating is considered in a novel proposal for processing D -dimensional quantum systems (quDits) encoded in the spatial degrees of freedom of light. We show that free-space propagation naturally implements basic single-quDit gates by means of the Talbot effect: an intricate time-space carpet of light in the near-field diffraction regime. By adding a diagonal phase gate, we show that a complete set of single-quDit gates can be implemented. We then introduce a spatially dependent beam splitter that allows for projective measurements in the computational basis and can be used for the implementation of controlled operations between two quDits. Universal quantum information processing can then be implemented with linear optics and ancilla photons via postselection and feed-forward following the original proposal of Knill-Laflamme and Milburn. Although we consider photons, our scheme should be directly applicable to a number of other physical systems. Interpretation of the Talbot effect as a quantum logic operation provides a beautiful and interesting way to visualize quantum computation through wave propagation and interference.

  8. A New Weave: Popular Education in Canada and Central America.

    ERIC Educational Resources Information Center

    Arnold, Rick; And Others

    Written from the perspective of the Central American experience of education for fundamental social change, this booklet provides ideas and guidelines for developing popular education, a learning process based on the concept that education can serve the interests of the poor and that the people themselves can define the content and context of…

  9. Weaving Theoretical Threads: Liberal, Psychoanalytic, Socialist Feminisms and Composition Theory.

    ERIC Educational Resources Information Center

    Remlinger, Kathryn

    The categorization of individual theories co-existing within the feminist framework limits the extent to which these theories can be woven together to fully develop the field of composition. By focusing on differences, taxonomies ignore the similarities among the framework's various theories. These similarities, when interlaced instead of…

  10. Interactivity and the Digital Whiteboard: Weaving the Fabric of Learning

    ERIC Educational Resources Information Center

    Haldane, Maureen

    2007-01-01

    This article presents the interactive whiteboard as a unique teaching and learning medium and explores the distinctive pedagogy that is emerging as its functionality continues to be exploited by increasing numbers of teachers. It draws on Kozma's studies of the characteristics of other learning media and how these define pedagogic opportunities to…

  11. Basket-Weave Technique for Medial Patellofemoral Ligament Reconstruction

    PubMed Central

    Kodkani, Pranjal S.

    2015-01-01

    The anatomy of the medial patellofemoral ligament (MPFL) has been well defined, with parts of its uppermost fibers having a soft-tissue insertion onto the vastus intermedius. Bone tunnels and implants on the patellar side therefore cannot replicate this anatomic construct precisely. Because of implants and tunnels, complications have been reported with bone tunnel fracture. Similarly, on the femoral side, rigid fixation with implants can result in over-constraint with compromised results. Moreover, bone tunnels cannot be used in skeletally immature cases. To overcome issues related to bone tunneling and implants, as well as to reconstruct the MPFL in a precise anatomic manner, an all–soft-tissue fixation technique was devised. Bony landmarks were used as reference points instead of radiologic markers to achieve a more precise construct and to eliminate intraoperative radiography. Hamstring graft was used to reconstruct the MPFL. Special suturing techniques were used to achieve optimal graft fixation with minimal suture knots. A special tissue elevator–suture passer device was designed to facilitate graft passage and ease in performing the procedure. This technique permits differential tensioning, and therefore one achieves stability throughout the range of motion. PMID:26258044

  12. Weaving New Retail and Consumer Landscapes in the Scottish Borders

    ERIC Educational Resources Information Center

    Findlay, Anne; Sparks, Leigh

    2008-01-01

    New retail locations and formats and changing consumer capabilities and behaviours (including "switching") have encouraged "outshopping" from rural to urban areas. Rural areas have been suffering from a decline in the provision of services, including retailing. One "solution" has been the strengthening of market towns in rural areas by the…

  13. Weaving Social Media into a Business Proposal Project

    ERIC Educational Resources Information Center

    Li, Xiaoli

    2012-01-01

    Given that students are enthusiastic about social media or even have expertise in some social media tools, the author decided to design a class project in her Writing for Careers (Business Communication) class that integrates social media in terms of content and project management. This article intends to describe such a class project design as…

  14. Image analysis of weaverbird nests reveals signature weave textures.

    PubMed

    Bailey, Ida E; Backes, André; Walsh, Patrick T; Morgan, Kate V; Meddle, Simone L; Healy, Susan D

    2015-06-01

    In nature, many animals build structures that can be readily measured at the scale of their gross morphology (e.g. length, volume and weight). Capturing individuality as can be done with the structures designed and built by human architects or artists, however, is more challenging. Here, we tested whether computer-aided image texture classification approaches can be used to describe textural variation in the nests of weaverbirds (Ploceus species) in order to attribute nests to the individual weaverbird that built them. We found that a computer-aided texture analysis approach does allow the assignment of a signature to weaverbirds' nests. We suggest that this approach will be a useful tool with which to examine individual variation across a range of animal constructions, not just for nests.

  15. SDI: O, what a tangled web we weave

    SciTech Connect

    Keeny, S.M. Jr.

    1993-11-01

    The ghost of the Strategic Defense Initiative (SDI) still haunts the Pentagon. The recent relevation that the highly publicized 1984 intercept of a mock Soviet reentry vehicle (RV) was rigged - as part of a highly secret deception plan to mislead the Soviet Union - has raised questions about the integrity and wisdom of defense development and policy processes.

  16. Weaving Connections: Educating for Peace, Social and Environmental Justice.

    ERIC Educational Resources Information Center

    Goldstein, Tara, Ed.; Selby, David, Ed.

    This collection of essays by Canadian educators seeks to achieve two goals. First, it documents educational philosophies and approaches that are directed toward equity, justice, peacefulness, and earth awareness. Second, it challenges current directions in Canadian school reform that promote "back to basics," centralization of control, a…

  17. Helping Students Weave Their Way through the World Wide Web.

    ERIC Educational Resources Information Center

    Elliott, Catherine B.

    2000-01-01

    Discusses six strategies to help both students and teachers learn to make wise use of information on the World Wide Web: teaching the value of key word skills; using online sources available in the media center; creating pathfinders; teaching students sound searching skills that include Boolean logic; directing students to the best search engines;…

  18. Changing the color of textiles with realistic visual rendering

    NASA Astrophysics Data System (ADS)

    Hébert, Mathieu; Henckens, Lambert; Barbier, Justine; Leboulleux, Lucie; Page, Marine; Roujas, Lucie; Cazier, Anthony

    2015-03-01

    Fast and easy preview of a fabric without having to produce samples would be very profitable for textile designers, but remains a technological challenge. As a first step towards this objective, we study the possibility of making images of a real sample, and changing virtually the colors of its yarns while preserving the shine and shadow texture. We consider two types of fabrics: Jacquard weave fabrics made of polyester warp and weft yarns of different colors, and satin ribbons made of polyester and metallic yarns. For the Jacquard fabric, we make a color picture with a scanner on a sample in which the yarns have contrasted colors, threshold this image in order to distinguish the pixels corresponding to each yarn, and accordingly modify their hue and chroma values. This method is simple to operate but do not enable to simulate the angle-dependent shine. A second method, tested on the satin ribbon made of black polyester and achromatic metallic yarns, is based on polarized imaging. We analyze the polarization state of the reflected light which is different for dielectric and metallic materials illuminated by polarized light. We then add a fixed color value to the pixels representing the polyester yarns and modify the hue and chroma of the pixels representing the metallic yarns. This was performed for many incident angles of light, in order to render the twinkling effect displayed by these ribbons. We could verify through a few samples that the simulated previews reproduce real pictures with visually acceptable accuracy.

  19. A study of elevated temperature testing techniques for the fatigue behavior of PMCS: Application to T650-35/AMB21

    NASA Technical Reports Server (NTRS)

    Gyekenyesi, Andrew L.; Gastelli, Michael G.; Ellis, John R.; Burke, Christopher S.

    1995-01-01

    An experimental study was conducted to investigate the mechanical behavior of a T650-35/AMB21 eight-harness satin weave polymer composite system. Emphasis was placed on the development and refinement of techniques used in elevated temperature uniaxial PMC testing. Issues such as specimen design, gripping, strain measurement, and temperature control and measurement were addressed. Quasi-static tensile and fatigue properties (R(sub sigma) = 0.1) were examined at room and elevated temperatures. Stiffness degradation and strain accumulation during fatigue cycling were recorded to monitor damage progression and provide insight for future analytical modeling efforts. Accomplishments included an untabbed dog-bone specimen design which consistently failed in the gage section, accurate temperature control and assessment, and continuous in-situ strain measurement capability during fatigue loading at elevated temperatures. Finally, strain accumulation and stiffness degradation during fatigue cycling appeared to be good indicators of damage progression.

  20. Rubber-toughened polyfunctional epoxies - Brominated vs nonbrominated formulated for graphite composites

    NASA Technical Reports Server (NTRS)

    Nir, Z.; Gilwee, W. J.; Kourtides, D. A.; Parker, J. A.

    1983-01-01

    A new, commercially available, trifunctional epoxy resin (tris-(hydroxyphenyl)-methane triglycidyl ether) was modified with synthetic rubber to increase the impact resistance of epoxy/graphite composites. These composites were reinforced with commercially available satin-weave carbon cloth using two formulations of epoxies (brominated and nonbrominated) containing various amounts of carboxy-terminated butadience acrylonitrile (CTBN) rubber that had been prereacted with epoxy resin. The impact resistance was determined by measuring the interlaminar shear strength of the composites after impact. The mechanical properties, such as flexural strength and modulus at room temperature and at 93 C, were also determined. Measurements were taken of the flammability and glass transition temperature (Tg); and a thermal-gravimetric analysis was made.

  1. Polymeric routes to silicon carbide and silicon oxycarbide CMC

    NASA Technical Reports Server (NTRS)

    Hurwitz, Frances I.; Heimann, Paul J.; Gyekenyesi, John Z.; Masnovi, John; Bu, Xin YA

    1991-01-01

    An overview of two approaches to the formation of ceramic composite matrices from polymeric precursors is presented. Copolymerization of alkyl- and alkenylsilanes (RSiH3) represents a new precursor system for the production of Beta-SiC on pyrolysis, with copolymer composition controlling polymer structure, char yield, and ceramic stoichiometry and morphology. Polysilsesquioxanes which are synthesized readily and can be handled in air serve as precursors to Si-C-O ceramics. Copolymers of phenyl and methyl silsesquioxanes display rheological properties favorable for composite fabrication; these can be tailored by control of pH, water/methoxy ratio and copolymer composition. Composites obtained from these utilize a carbon coated, eight harness satin weave Nicalon cloth reinforcement. The material exhibits nonlinear stress-strain behavior in tension.

  2. High Dose Neutron Irradiation of Hi-Nicalon Type S Silicon Carbide Composites, Part 2. Mechanical and Physical Properties

    SciTech Connect

    Katoh, Yutai; Nozawa, Takashi; Shih, Chunghao Phillip; Ozawa, Kazumi; Koyanagi, Takaaki; Porter, Wallace D; Snead, Lance Lewis

    2015-01-07

    Nuclear-grade silicon carbide (SiC) composite material was examined for mechanical and thermophysical properties following high-dose neutron irradiation in the High Flux Isotope Reactor at a temperature range of 573–1073 K. Likewise, the material was chemical vapor-infiltrated SiC-matrix composite with a two-dimensional satin weave Hi-Nicalon Type S SiC fiber reinforcement and a multilayered pyrocarbon/SiC interphase. Moderate (1073 K) to very severe (573 K) degradation in mechanical properties was found after irradiation to >70 dpa, whereas no evidence was found for progressive evolution in swelling and thermal conductivity. The swelling was found to recover upon annealing beyond the irradiation temperature, indicating the irradiation temperature, but only to a limited extent. Moreover, the observed strength degradation is attributed primarily to fiber damage for all irradiation temperatures, particularly a combination of severe fiber degradation and likely interphase damage at relatively low irradiation temperatures.

  3. High-dose neutron irradiation of Hi-Nicalon Type S silicon carbide composites. Part 2: Mechanical and physical properties

    NASA Astrophysics Data System (ADS)

    Katoh, Yutai; Nozawa, Takashi; Shih, Chunghao; Ozawa, Kazumi; Koyanagi, Takaaki; Porter, Wally; Snead, Lance L.

    2015-07-01

    Nuclear-grade silicon carbide (SiC) composite material was examined for mechanical and thermophysical properties following high-dose neutron irradiation in the High Flux Isotope Reactor at a temperature range of 573-1073 K. The material was chemical vapor-infiltrated SiC-matrix composite with a two-dimensional satin weave Hi-Nicalon Type S SiC fiber reinforcement and a multilayered pyrocarbon/SiC interphase. Moderate (1073 K) to very severe (573 K) degradation in mechanical properties was found after irradiation to >70 dpa, whereas no evidence was found for progressive evolution in swelling and thermal conductivity. The swelling was found to recover upon annealing beyond the irradiation temperature, indicating the irradiation temperature, but only to a limited extent. The observed strength degradation is attributed primarily to fiber damage for all irradiation temperatures, particularly a combination of severe fiber degradation and likely interphase damage at relatively low irradiation temperatures.

  4. Development of new and improved polymer matrix resin systems, phase 1

    NASA Technical Reports Server (NTRS)

    Hsu, M. S.

    1983-01-01

    Vinystilbazole (vinylstryrylpyridine) and vinylpolystyrulpyridine were prepared for the purpose of modifying bismaleimide composite resins. Cure studies of resins systems were investigated by differential scanning calorimetry. The vinylstyrylpyridine-modified bismaleimide composite resins were found to have lower cure and gel temperatures, and shorter cure times than the corresponding unmodified composite resins. The resin systems were reinforced with commercially avialable satin-weave carbon cloth. Prepregs were fabricated by solvent or hot melt techniques. Thermal stability, flammability, moisture absorption, and mechanical properties of the composites (such as flexural strength, modulus, tensile and short beam shear strength) were determined. Composite laminates showed substantial improvements in both processability and mechanical properties compared to he bismaleimide control systems. The vinylstyrylpyridine modified bismaleimide resins can be used as advanced matrix resins for graphite secondary structures where ease of processing, fireworthiness, and high temperature stability are required for aerospace applications.

  5. Mode I, Mode II, and mixed mode interlaminar fracture of woven fabric carbon/epoxy

    SciTech Connect

    Alif, N.; Carlsson, L.A.; Gillespie, J.W. Jr.

    1997-12-31

    Interlaminar fracture behavior of a five-harness satin orthogonal woven fabric carbon/epoxy composite laminate loaded in Mode I, Mode II, and mixed mode has been investigated. Fracture testing employed the DCB, ENF, and MMB specimens. Special emphasis was put on microscopic details of crack growth and their relation to fracture resistance. For all fracture mode combinations it was found that crack growth occurred in a nonplanar region of topology determined by the weave pattern and relative positioning of the plies adjacent to the crack plane. The woven fabric structure constrains fiber bridging, but partial debonding of transversely oriented fiber bundles led to occasional crack branching, stick-slip behavior leading to variations in the Mode I fracture resistance. Slow stable crack growth occurred in the ENF and MMB specimens prior to unstable fracture and resulted in nonlinear load-displacement response.. A linear relation between the critical values of G{sub I} and G{sub II} was observed.

  6. Effects of Nesting on Compression-Loaded 2-D Woven Textile Composites

    NASA Technical Reports Server (NTRS)

    Adams, Daniel OHare; Breiling, Kurtis B.; Verhulst, Mark A.

    1995-01-01

    Layer nesting was investigated in five harness satin weave textile composite laminates under static compression loading. Two carbon/epoxy material systems, AS4/3501-6 and IM7/8551-7A were considered. Laminates were fabricated with three idealized nesting cases: stacked, split-span and diagonal. Similar compression strength reductions due to the effects of idealized nesting were identified for each material. The diagonal nesting geometry produced the largest reduction in static strength when compared to the compression strength of a conventional textile composite. All three nesting cases produced reductions in strength and ultimate strain due to the effects of idealized nesting. Finite element results showed consistent strength reduction trends for the idealized nesting cases, however the magnitudes of compressive strengths were overpredicted.

  7. Effects of Microstructural Variability on Thermo-Mechanical Properties of a Woven Ceramic Matrix Composite

    NASA Technical Reports Server (NTRS)

    Goldsmith, Marlana B.; Sankar, Bhavani V.; Haftka, Raphael T.; Goldberg, Robert K.

    2013-01-01

    The objectives of this paper include identifying important architectural parameters that describe the SiC/SiC five-harness satin weave composite and characterizing the statistical distributions and correlations of those parameters from photomicrographs of various cross sections. In addition, realistic artificial cross sections of a 2D representative volume element (RVE) are generated reflecting the variability found in the photomicrographs, which are used to determine the effects of architectural variability on the thermo-mechanical properties. Lastly, preliminary information is obtained on the sensitivity of thermo-mechanical properties to architectural variations. Finite element analysis is used in combination with a response surface and it is shown that the present method is effective in determining the effects of architectural variability on thermo-mechanical properties.

  8. Optimization of the Composite Repair Work using 5H Satin Dry Glass Fabric and Epoxy Resin LY5052/HY5052 Materials through the Vacuum Bagging Technique

    NASA Astrophysics Data System (ADS)

    Hartono; Rifai, Mochammad; Subawi, Handoko

    2016-08-01

    In composite repair terminology, the intermingled fiber joints (IFJs) concept is clearly identified as the most effective in transferring stress. However, the practical application leads to apply the laminated fiber joints (LFJs) concept for composite repair. The LFJs become almost as strong as the IFJs as the jointed zone length increases. The LFJs concept was implemented to set up the repair configuration for this work. It is identified that fracture tendency as the result of crack propagation starts from the free edges. This tendency is alleviated by applying vacuum bag to compact the laminate system. If necessary, additional accelerated curing was performed at low temperature for short time. However, this repair work preferably applying natural overnight cure to ensure the structure stability. Additionally, the repair handling and waiting purposes take 40% out of the effectively repair time. The waiting time should be anticipated in the composite repair to reduce wasting time for unproductive output.

  9. Evaluation of Solid Modeling Software for Finite Element Analysis of Woven Ceramic Matrix Composites

    NASA Technical Reports Server (NTRS)

    Nemeth, Noel N.; Mital, Subodh; Lang, Jerry

    2010-01-01

    Three computer programs, used for the purpose of generating 3-D finite element models of the Repeating Unit Cell (RUC) of a textile, were examined for suitability to model woven Ceramic Matrix Composites (CMCs). The programs evaluated were the open-source available TexGen, the commercially available WiseTex, and the proprietary Composite Material Evaluator (COMATE). A five-harness-satin (5HS) weave for a melt-infiltrated (MI) silicon carbide matrix and silicon carbide fiber was selected as an example problem and the programs were tested for their ability to generate a finite element model of the RUC. The programs were also evaluated for ease-of-use and capability, particularly for the capability to introduce various defect types such as porosity, ply shifting, and nesting of a laminate. Overall, it was found that TexGen and WiseTex were useful for generating solid models of the tow geometry; however, there was a lack of consistency in generating well-conditioned finite element meshes of the tows and matrix. TexGen and WiseTex were both capable of allowing collective and individual shifting of tows within a ply and WiseTex also had a ply nesting capability. TexGen and WiseTex were sufficiently userfriendly and both included a Graphical User Interface (GUI). COMATE was satisfactory in generating a 5HS finite element mesh of an idealized weave geometry but COMATE lacked a GUI and was limited to only 5HS and 8HS weaves compared to the larger amount of weave selections available with TexGen and WiseTex.

  10. Impact of Material and Architecture Model Parameters on the Failure of Woven Ceramic Matrix Composites (CMCs) via the Multiscale Generalized Method of Cells

    NASA Technical Reports Server (NTRS)

    Liu, Kuang C.; Arnold, Steven M.

    2011-01-01

    It is well known that failure of a material is a locally driven event. In the case of ceramic matrix composites (CMCs), significant variations in the microstructure of the composite exist and their significance on both deformation and life response need to be assessed. Examples of these variations include changes in the fiber tow shape, tow shifting/nesting and voids within and between tows. In the present work, the effects of many of these architectural parameters and material scatter of woven ceramic composite properties at the macroscale (woven RUC) will be studied to assess their sensitivity. The recently developed Multiscale Generalized Method of Cells methodology is used to determine the overall deformation response, proportional elastic limit (first matrix cracking), and failure under tensile loading conditions. The macroscale responses investigated illustrate the effect of architectural and material parameters on a single RUC representing a five harness satin weave fabric. Results shows that the most critical architectural parameter is weave void shape and content with other parameters being less in severity. Variation of the matrix material properties was also studied to illustrate the influence of the material variability on the overall features of the composite stress-strain response.

  11. Modeling and characterization of long term material behavior in polymer composites with woven fiber architecture

    NASA Astrophysics Data System (ADS)

    Gupta, Vikas

    The purpose of this research is to develop an analytical tool which, when coupled with accelerated material characterization, is capable of predicting long-term durability of polymers and their composites. Conducting creep test on each composite laminate with different fibers, fiber volume fractions, and weave architectures is impractical. Moreover, in case of thin laminates, accurately characterizing the out-of-plane matrix dominated viscoelastic response is not easily achievable. Therefore, the primary objective of this paper is to present a multi-scale modeling methodology to simulate the long-term interlaminar properties in polymer matrix woven composites and then predict the critical regions where failure is most likely to occur. A micromechanics approach towards modeling the out-of-plane viscoelastic behavior of a five-harness satin woven-fiber cross-ply composite laminate is presented, taking into consideration the weave architecture and time-dependent effects. Short-term creep tests were performed on neat resin at different test temperatures and stress levels to characterize physical aging of the resin matrix. In addition, creep and recovery experiments were conducted on un-aged resin specimens in order to characterize the pronounced stress-dependent nonlinear viscoelastic response of the PR500 resin. Two-dimensional micromechanics analysis was carried out using a test-bed finite element code, NOVA-3D, including interactions between non-linear material constitutive behavior, geometric nonlinearity, aging and environmental effects.

  12. Electrical properties analysis of wire mesh for mesh reflectors

    NASA Astrophysics Data System (ADS)

    Li, Tuanjie; Su, Jinguo

    2011-07-01

    The knitted wire mesh is often used as a reflecting surface of large deployable antennas. Different weaves have different electrical properties and it is very important and necessary to research the method of analyzing the electrical properties of wire mesh. This paper has developed an effective method to address the problem. First, a periodic unit of wire model in actual complex mesh structure is converted into an equivalent strip model according to the correlation between strip width and wire diameter. The equivalent regular wire-grid unit of the strip model is derived from the equivalences between the wire-grid unit and the strip model in near and far fields. Then the regular wire-grid units are arranged to form an equivalent mesh surface with the corresponding weave pattern, so the electrical properties of the mesh surface are equivalent to those of the actual mesh structure. Through analyzing electrical properties of the mesh surface including amplitude difference, phase difference and reflecting loss, we can find out the electrical properties of the actual knitted wire mesh. The single satin mesh and a two-bar tricot mesh are used as examples to illustrate the method of electrical properties analysis of wire mesh.

  13. Fracture morphology of 2-D carbon-carbon composition

    NASA Technical Reports Server (NTRS)

    Avery, W. B.; Herakovich, C. T.

    1985-01-01

    Out-of-plane tensile tests of a woven fabric carbon-carbon composite were performed in a scanning electron microscope equipped with a tensile stage and a videotape recording system. The composite was prepared from T-300 8-harness satin graphite fabric and a phenolic resin. The (0/90/0/90/0 sub 1/2) sub 2 laminate, with a Theta describing the orientation of the warp fibers of the fabric, was cured at 160 C and pyrolized at 871 C. This was followed by four cycles of resin impregnation, curing, and pyrolysis. A micrograph of the cross section of the composite is presented. Inspection of the specimen fracture surface revealed that the filaments had no residual matrix bonded to them. Further inspection revealed that the fracture was interlaminar in nature. Failure occurred where filaments of adjacent plies had the same orientation. Thus it is postulated that improvement in transverse tensile strength of 2-D carbon-carbon depends on the improvement of the filament-matrix bond strength.

  14. Microdamage analysis in thermally aged CF/polyimide laminates

    NASA Astrophysics Data System (ADS)

    Varna, J.; Zrida, H.; Fernberg, P.

    2016-07-01

    Microdamage in layers of CF Thornel® T650 8-harness satin woven composite with thermosetting polyimide NEXIMID® MHT-R resin was analysed. After cooling to room temperature multiple intra-bundle cracking due to tensile transverse thermal stresses was observed in the studied [(+45/-45)/(90/0)]2s composite. The composite was subjected to thermal cycling quantifying the increase of crack density in layers. Comparison of two ramps with the same lowest temperature shows that the highest temperature in the cycle has a significant detrimental effect. Exposure for 40 days to 288°C caused many new cracks after cooling down to room temperature. Both aged and not aged specimens were tested in uniaxial quasi-static tension. Cracking was analysed using fracture mechanics and probabilistic approaches. Cracking in off-axis layers was predicted based on Weibull analysis of the 90- layer. The thermal treatment degraded the cracking resistance of the surface layer and of the next layer.

  15. 76 FR 15302 - Nationwide Categorical Waivers Under Section 1605 (Buy American) of the American Recovery and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-21

    ... Hinge Pin Stops; Exterior Wall Mount Two Head Flood Light w/270 Degree Motion Sensor & Brushed Nickel... Attachment; Residential Style Satin Chrome Handrail Bracket; Satin Nickel Outdoor Sconce Light Fixture...; Residential Style Polished Chrome 30'' Towel Bar; Satin Nickel Finish Wall Mounted Spring Door Stop....

  16. The impact of UVB radiation on the glycoprotein glue of orb-weaving spider capture thread.

    PubMed

    Stellwagen, Sarah D; Opell, Brent D; Clouse, Mary E

    2015-09-01

    Many spider orb-webs are exposed to sunlight and the potentially damaging effects of ultraviolet B (UVB) radiation. We examined the effect of UVB on the viscoelastic glycoprotein core of glue droplets deposited on the prey capture threads of these webs, hypothesizing that webs built by species that occupy sunny habitats are less susceptible to UVB damage than are webs built by species that prefer shaded forest habitats or by nocturnal species. Threads were tested shortly after being collected in the early morning and after being exposed to UVB energy equivalent to a day of summer sun and three times this amount. Droplets kept in a dark chamber allowed us to evaluate post-production changes. Droplet volume was unaffected by treatments, indicating that UVB did not damage the hygroscopic compounds in the aqueous layer that covers droplets. UVB exposure did not affect energies of droplet extension for species from exposed and partially to mostly shaded habitats (Argiope aurantia, Leucauge venusta and Verrucosa arenata). However, UVB exposure reduced the energy of droplet extension in Micrathena gracilis from shaded forests and Neoscona crucifera, which forages at night. Only in L. venusta did the energy of droplet extension increase after the dark treatment, suggesting endogenous molecular alignment. This study adds UVB irradiation to the list of factors (humidity, temperature and strain rate) known to affect the performance of spider glycoprotein glue, factors that must be more fully understood if adhesives that mimic spider glycoprotein glue are to be produced. PMID:26333924

  17. Weaving public health education into the fabric of a family medicine residency.

    PubMed

    Potts, Stacy E; Deligiannidis, Konstantinos E; Cashman, Suzanne B; Caggiano, Marie E; Carter, Lisa H; Haley, Heather-Lyn; Ferguson, Warren J

    2011-10-01

    Policymakers and accrediting bodies have recognized the importance of integrating public health, population health, and prevention into graduate medical education programs. The high prevalence of chronic illness, coupled with the impact of behavioral and societal determinants of health, necessitate an urgent call for family medicine residencies to prepare future leaders to meet these challenges. The University of Massachusetts Worcester Family Medicine Residency recently developed an integrated curriculum that strives to develop a culture of incorporating fundamental public health principles into everyday practice. This public health curriculum was designed to integrate new topics within the current residency structure through longitudinal and concentrated experiences. This strategy has substantially improved public health and prevention education without substantial impact on the already strained residency curricular structure. This paper describes the integration of public health and prevention education into a family medicine residency to help residents acquire the fundamental skills necessary to improve a population's health.

  18. Wnt Drug Discovery: Weaving Through the Screens, Patents and Clinical Trials.

    PubMed

    Lu, Benjamin; Green, Brooke A; Farr, Jacqueline M; Lopes, Flávia C M; Van Raay, Terence J

    2016-01-01

    The Wnt signaling pathway is intricately involved in many aspects of development and is the root cause of an increasing number of diseases. For example, colorectal cancer is the second leading cause of death in the industrialized world and aberration of Wnt signaling within the colonic stem cell is the cause of more than 90% of these cancers. Despite our advances in successfully targeting other pathways, such as Human Epidermal Growth Factor Receptor 2 (HER2), there are no clinically relevant therapies available for Wnt-related diseases. Here, we investigated where research activities are focused with respect to Wnt signaling modulators by searching the United States Patent and Trade Office (USPTO) for patents and patent applications related to Wnt modulators and compared this to clinical trials focusing on Wnt modulation. We found that while the transition of intellectual property surrounding the Wnt ligand-receptor interface to clinical trials is robust, this is not true for specific inhibitors of β-catenin, which is constitutively active in many cancers. Considering the ubiquitous use of the synthetic T-cell Factor/Lymphoid Enhancer Factor (TCF/Lef) reporter system and its success in identifying novel modulators in vitro, we speculate that this model of drug discovery does not capture the complexity of in vivo Wnt signaling that may be required if we are to successfully target the Wnt pathway in the clinic. Notwithstanding, increasingly more complex models are being developed, which may not be high throughput, but more pragmatic in our pursuit to control Wnt signaling. PMID:27598201

  19. Cobweb-weaving spiders produce different attachment discs for locomotion and prey capture.

    PubMed

    Sahni, Vasav; Harris, Jared; Blackledge, Todd A; Dhinojwala, Ali

    2012-01-01

    Spiders' cobwebs ensnare both walking and flying prey. While the scaffolding silk can entangle flying insects, gumfoot silk threads pull walking prey off the ground and into the web. Therefore, scaffolding silk needs to withstand the impact of the prey, whereas gumfoot silk needs to easily detach from the substrate when contacted by prey. Here we show that spiders accomplish these divergent demands by creating attachment discs of two distinct architectures using the same pyriform silk. A 'staple-pin' architecture firmly attaches the scaffolding silk to the substrate and a previously unknown 'dendritic' architecture weakly attaches the gumfoot silk to the substrate. Gumfoot discs adhere weakly, triggering a spring-loaded trap, while the strong adhesion of scaffolding discs compels the scaffolding threads to break instead of detaching. We describe the differences in adhesion for these two architectures using tape-peeling models and design synthetic attachments that reveal important design principles for controlled adhesion.

  20. Connecting Readers and Writers with Books: Weaving Literature into the School Community.

    ERIC Educational Resources Information Center

    Harwayne, Shelley; Hudes, Layne; Siegman, Lisa

    1997-01-01

    Notes several kinds of book clubs (for adults, children, and both) and the joys of sharing reading with others. Discusses 32 children's books (books of poetry, lessons for young writers, on the realities of young people's lives, and books that lead to talk about real heroes) that lend themselves to passionate and spirited book talk. (SR)

  1. Weaving a Personal Web: Using Online Technologies to Create Customized, Connected, and Dynamic Learning Environments

    ERIC Educational Resources Information Center

    McElvaney, Jessica; Berge, Zane

    2009-01-01

    This paper explores how "personal web technologies" (PWTs) can be used by learners and the relationship between PWTs and connectivist learning principles. Descriptions and applications of several technologies including social bookmarking tools, personal publishing platforms, and aggregators are also included. With these tools, individuals can…

  2. Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae).

    PubMed

    Cabra-García, Jimmy; Brescovit, Antonio D

    2016-01-01

    A taxonomic revision and phylogenetic analysis of the spider genus Glenognatha Simon, 1887 is presented. This analysis is based on a data set including 24 Glenognatha species plus eight outgroups representing three related tetragnathine genera and one metaine as the root. These taxa were scored for 78 morphological characters. Parsimony was used as the optimality criterion and a sensitivity analysis was performed using different character weighting concavities. Seven unambiguous synapomorphies support the monophyly of Glenognatha. Some internal clades within the genus are well-supported and its relationships are discussed. Glenognatha as recovered includes 27 species, four of them only known from males. A species identification key and distribution maps are provided for all. New morphological data are also presented for thirteen previously described species. Glenognatha has a broad distribution occupying the Neartic, Afrotropic, Indo-Malaya, Oceania and Paleartic regions, but is more diverse in the Neotropics. The following eleven new species are described: G. vivianae n. sp., G. caaguara n. sp., G. boraceia n. sp. and G. timbira n. sp. from southeast Brazil, G. caparu n. sp., G. januari n. sp. and G. camisea n. sp. from the Amazonian region, G. mendezi n. sp., G. florezi n. sp. and G. patriceae n. sp. from northern Andes and G. gouldi n. sp. from Southern United States and central Mexico. Females of G. minuta Banks, 1898, G. gaujoni Simon, 1895 and G. gloriae (Petrunkevitch, 1930) and males of G. globosa (Petrunkevitch, 1925) and G. hirsutissima (Berland, 1935) are described for the first time. Three new combinations are proposed in congruence with the phylogenetic results: G. argyrostilba (O. P.-Cambridge, 1876) n. comb., G. dentata (Zhu & Wen, 1978) n. comb. and G. tangi (Zhu, Song & Zhang, 2003) n. comb., all previously included in Dyschiriognatha Simon, 1893. The following taxa are newly synonymized: Dyschiriognatha montana Simon, 1897, Glenognatha mira Bryant, 1945 and Glenognatha maelfaiti Baert, 1987 with Glenognatha argyrostilba (Pickard-Cambridge, 1876) and Glenognatha centralis Chamberlin, 1925 with Glenognatha minuta Banks, 1898. PMID:27395905

  3. Weaving a Net of Neurobiological Mechanisms in Schizophrenia and Unraveling the Underlying Pathophysiology.

    PubMed

    Bitanihirwe, Byron K Y; Mauney, Sarah A; Woo, Tsung-Ung W

    2016-10-15

    Perineuronal nets (PNNs) are enigmatic structures composed of extracellular matrix molecules that encapsulate the soma, dendrites, and axon segments of neurons in a lattice-like fashion. Although most PNNs condense around parvalbumin-expressing gamma-aminobutyric acidergic interneurons, some glutamatergic pyramidal cells in the brain are also surrounded by PNNs. Experimental findings suggest pivotal roles of PNNs in the regulation of synaptic formation and function. Also, an increasing body of evidence links PNN abnormalities to schizophrenia. The number of PNNs progressively increases during postnatal development until plateauing around the period of late adolescence and early adulthood, which temporally coincides with the age of onset of schizophrenia. Given the established role of PNNs in modulating developmental plasticity, the PNN represents a possible candidate for altering the onset and progression of schizophrenia. Similarly, the reported function of PNNs in regulating the trafficking of glutamate receptors places them in a critical position to modulate synaptic pathology, considered a cardinal feature of schizophrenia. We discuss the physiologic role of PNNs in neural function, synaptic assembly, and plasticity as well as how they interface with circuit/system mechanisms of cognition. An integrated understanding of these neurobiological processes should provide a better basis to elucidate how PNN abnormalities influence brain function and contribute to the pathogenesis of neurodevelopmental disorders such as schizophrenia.

  4. A tangled weave: Tracing outcomes of education in rural women's lives in North India

    NASA Astrophysics Data System (ADS)

    Ghose, Malini; Mullick, Disha

    2015-06-01

    This paper is based on the findings of a research study which traced 56 rural women learners 15 years after they had participated in an empowerment and education programme in North India. It attempts to understand, from the perspectives of women from marginalised communities, the ways in which participating in the programme had been empowering for them, or not. While most of the women were indeed able to transform several areas in their lives, this study illustrates that empowering outcomes cannot be assumed or articulated in categorical terms and that bringing about change requires the negotiation of power at various levels. The women's narratives stand in contrast to the prevalent discourses around women's literacy and empowerment, which highlight the importance of literacy only in terms of its positive impact on attaining development goals. Despite the vigorously discussed de-politicisation of the concept of empowerment, the authors show in this paper that empowerment, when informed by a critical feminist understanding, continues to provide a useful framework to analyse women's experiences related to education, as a process enabling women to understand and negotiate structures of power - which are neither static nor wholly dominating - and to find spaces to exercise agency. There are few longitudinal studies which trace the long-term impact of educational programmes on adult women, and most studies are in the nature of impact assessments of programmes. Through this paper the authors argue for the need to analyse the complexities around the relationship between women's education and empowerment.

  5. Second Language Learning with the Story Maze Task: Examining the Training Effect of Weaving through Stories

    ERIC Educational Resources Information Center

    Enkin, Elizabeth

    2016-01-01

    The maze task is a psycholinguistic experimental procedure that measures real-time incremental sentence processing. The task has recently been tested as a language learning tool with promising results. Therefore, the present study examines the merits of a contextualized version of this task: the story maze. The findings are consistent with…

  6. We Are What We Weave? Issues and Guidelines for Learning by Web Design.

    ERIC Educational Resources Information Center

    Lim, Byung-Ro; Plucker, Jonathan A.; Nowak, Jeffrey A.

    2001-01-01

    Explains learning-by-Web design, an emerging approach to learning-by-design that uses the Web as a vehicle to conduct a project. Discusses student's motivation, the effects of group collaboration on student learning, the effects of content structure, the effects of Web publicity, visual design considerations, and balancing learning both design…

  7. Weaving Together Science and English: An Interconnected Model of Language Development for Emergent Bilinguals

    ERIC Educational Resources Information Center

    Ciechanowski, Kathryn M.

    2014-01-01

    This research explores third-grade science and language instruction for emergent bilinguals designed through a framework of planning, lessons, and assessment in an interconnected model including content, linguistic features, and functions. Participants were a team of language specialist, classroom teacher, and researcher who designed…

  8. Weaving together peer assessment, audios and medical vignettes in teaching medical terms

    PubMed Central

    Khan, Lateef M.

    2015-01-01

    Objectives The current study aims at exploring the possibility of aligning peer assessment, audiovisuals, and medical case-report extracts (vignettes) in medical terminology teaching. In addition, the study wishes to highlight the effectiveness of audio materials and medical history vignettes in preventing medical students' comprehension, listening, writing, and pronunciation errors. The study also aims at reflecting the medical students' attitudes towards the teaching and learning process. Methods The study involved 161 medical students who received an intensive medical terminology course through audio and medical history extracts. Peer assessment and formative assessment platforms were applied through fake quizzes in a pre- and post-test manner. An 18-item survey was distributed amongst students to investigate their attitudes and feedback towards the teaching and learning process. Quantitative and qualitative data were analysed using the SPSS software. Results The students did better in the posttests than on the pretests for both the quizzes of audios and medical vignettes showing a t-test of -12.09 and -13.60 respectively. Moreover, out of the 133 students, 120 students (90.22%) responded to the survey questions. The students gave positive attitudes towards the application of audios and vignettes in the teaching and learning of medical terminology and towards the learning process. Conclusions The current study revealed that the teaching and learning of medical terminology have more room for the application of advanced technologies, effective assessment platforms, and active learning strategies in higher education. It also highlights that students are capable of carrying more responsibilities of assessment, feedback, and e-learning. PMID:26637986

  9. Beyond Earth: Weaving Science and Indigenous Culture - A 1-year NSF Planning Grant

    NASA Astrophysics Data System (ADS)

    Young, Timothy; Guy, M.; Baker Big-Back, C.; Froelich, K.

    2011-01-01

    We present results of a 1-year NSF planning grant called Beyond Earth. The project is designed to engage Native American, urban, and rural families in science learning while piloting curriculum development and implementation that incorporates both Native and Western epistemologies. Physical, earth, and space science content is juxtaposed with indigenous culture, stories, language and epistemology in after-school programs and teacher training. Project partners include the Dakota Science Center, Fort Berthold Community College, and Sitting Bull College. The Native American tribes represented in this initiative illustrate partnerships between the Dakota, Lakota, Nakota, Hidatsa, Mandan, and Arikara. Over the past year the primary project deliverables include a culturally responsive curriculum Beyond Earth Moon Module, teacher training workshops, a project website. The curriculum module introduces students to the moon's appearance, phases, and positions in the sky using the Night Sky Planetarium Experience Station to explore core concepts underlying moon phases and eclipses using the interactive Nature Experience Station before engaging in the culminating Mission Challenge in which they apply their knowledge to problem solving situations and projects. The Native Science and Western Science activities developed, planetarium explorations created, and website toolkit utilizations are presented.

  10. Connecting Readers and Writers with Books: Weaving Literature into the School Community.

    ERIC Educational Resources Information Center

    Afromsky, Ellen; Davis, Judy; Harwayne, Shelley; Hudes, Layne; Lederman, Diane; Mayer, Pam; Rhodes, Roberta Pantal; Siegman, Lisa

    1998-01-01

    Offers descriptions of 34 books for children and young adolescents (many of them illustrated books), in the following categories: books for the youngest readers; poems for young writers; books about the moon; books celebrating city life; books for older readers; and books of multicultural folktales. (SR)

  11. Weaving New Meanings: Evaluating Children's Written Responses to a Story Telling Resource Package

    ERIC Educational Resources Information Center

    Brady, Josephine; Millard, Elaine

    2012-01-01

    This paper documents an evaluation of children's written responses to a story telling package used in an intervention project set up by the National Association for the Teaching of English as part of the larger "Inspire Rotherham" literacy campaign. The brief was to provide a group of primary teachers with innovative and inspirational approaches…

  12. Weaving Teacher Education into the Fabric of Urban Schools and Communities

    ERIC Educational Resources Information Center

    Noel, Jana

    2010-01-01

    A number of socially transformative implications of connecting teacher education with urban schools and communities have been documented, including: (1) building trust with local communities; (2) creating a greater commitment to community through service learning; (3) preparing culturally responsive future teachers who are more effective when…

  13. Weaving Traditional Ecological Knowledge into Biological Education: A Call to Action.

    ERIC Educational Resources Information Center

    Kimmerer, Robin Wall

    2002-01-01

    Traditional ecological knowledge has value not only for the wealth of biological information it contains but also for the cultural framework of respect, reciprocity, and responsibility in which it is embedded. (Contains 48 references.) (DDR)

  14. Beauty and Precision: Weaving Complex Educational Technology Projects with Visual Instructional Design Languages

    ERIC Educational Resources Information Center

    Derntl, Michael; Parrish, Patrick; Botturi, Luca

    2010-01-01

    Instructional design and technology products result from many options and constraints. On the one hand, solutions should be creative, effective and flexible; on the other hand, developers and instructors need precise guidance and details on what to do during development and implementation. Communication of and about designs is supported by design…

  15. Weaving a Tapestry from Threads Spun by Geneticists: The Series Perspectives on Genetics, 1987-2008.

    PubMed

    Dove, William F

    2016-07-01

    The Perspectives column was initiated in 1987 when Jan Drake, Editor-in-Chief of GENETICS, invited Jim Crow and William Dove to serve as coeditors of "Anecdotal, Historical, and Critical Commentaries." As the series evolved over 21 years, under the guidance of Crow and Dove, the input of stories told by geneticists from many countries created a panorama of 20th-century genetics. Three recurrent themes are visible: how geneticists have created the science (as solitary investigators, in pairs, or in cooperative groups); how geneticists work hard, but find ways to have fun; and how public and private institutions have sustained the science of genetics, particularly in the United States. This article ends by considering how the Perspectives series and other communication formats can carry forward the core science of genetics from the 20th into the 21st century.

  16. Modular evolution of egg case silk genes across orb-weaving spider superfamilies

    PubMed Central

    Garb, Jessica E.; Hayashi, Cheryl Y.

    2005-01-01

    Spider silk proteins (fibroins) are renowned for their extraordinary mechanical properties and biomimetic potential. Despite extensive evolutionary, ecological, and industrial interest in these fibroins, only a fraction of the known silk types have been characterized at the molecular level. Here we report cDNA and genomic sequences of the fibroin TuSp1, which appears to be the major component of tubuliform gland silk, a fiber exclusively synthesized by female spiders for egg case construction. We obtained TuSp1 sequences from 12 spider species that represent the extremes of phylogenetic diversity within the Orbicularia (orb-weaver superfamilies, Araneoidea and Deinopoidea) and finer scale sampling within genera. TuSp1 encodes tandem arrays of an ≈200-aa-long repeat unit and individual repeats are readily aligned, even among species that diverged >125 million years ago. Analyses of these repeats across species reveal the strong influence of concerted evolution, resulting in intragenic homogenization. However, deinopoid TuSp1 repeats also contain insertions of coding, minisatellite-like sequences, an apparent result of replication slippage and nonreciprocal recombination. Phylogenetic analyses of 37 spider fibroin sequences support the monophyly of TuSp1 within the spider fibroin gene family, consistent with a single origin of this ortholog group. The diversity of taxa and silks examined here confirms that repetitive architecture is a general feature of this gene family. Moreover, we show that TuSp1 provides a clear example of modular evolution across a range of phylogenetic levels. PMID:16061817

  17. Weaving Dreamcatchers: Mothering among American Indian Women who were Teen Mothers

    PubMed Central

    Palacios, Janelle F.; Strickland, Carolyn J.; Chesla, Catherine A.; Kennedy, Holly P.; Portillo, Carmen J.

    2013-01-01

    Aims The aim of this study was to explore the mothering experience and practice among reservation based adult American Indian women who had been adolescent mothers. Background Adolescent American Indian women are at an elevated risk for teen pregnancy and poor maternal/child outcomes. Identifying mothering practices among this population may help guide intervention development that will improve health outcomes. Design A collaborative orientation to community based participatory research approach. Methods Employing interpretive phenomenology, 30 adult American Indian women who resided on a Northwestern reservation were recruited. In-depth, face-to-face and telephone interviews were conducted between 2007 and 2008. Findings Women shared their mothering experience and practice which encompassed a lifespan perspective grounded in their American Indian cultural tradition. Four themes were identified: mother hen, interrupted mothering and second chances, breaking cycles and mothering a community. Mothering originated in childhood, extended across their lifespan and moved beyond mothering their biological offspring. Conclusion These findings challenge the Western construct of mothering and charge nurses to seek culturally sensitive interventions that reinforce positive mothering practices and identify when additional mothering support is needed across a woman’s lifespan. PMID:23713884

  18. The impact of UVB radiation on the glycoprotein glue of orb-weaving spider capture thread.

    PubMed

    Stellwagen, Sarah D; Opell, Brent D; Clouse, Mary E

    2015-09-01

    Many spider orb-webs are exposed to sunlight and the potentially damaging effects of ultraviolet B (UVB) radiation. We examined the effect of UVB on the viscoelastic glycoprotein core of glue droplets deposited on the prey capture threads of these webs, hypothesizing that webs built by species that occupy sunny habitats are less susceptible to UVB damage than are webs built by species that prefer shaded forest habitats or by nocturnal species. Threads were tested shortly after being collected in the early morning and after being exposed to UVB energy equivalent to a day of summer sun and three times this amount. Droplets kept in a dark chamber allowed us to evaluate post-production changes. Droplet volume was unaffected by treatments, indicating that UVB did not damage the hygroscopic compounds in the aqueous layer that covers droplets. UVB exposure did not affect energies of droplet extension for species from exposed and partially to mostly shaded habitats (Argiope aurantia, Leucauge venusta and Verrucosa arenata). However, UVB exposure reduced the energy of droplet extension in Micrathena gracilis from shaded forests and Neoscona crucifera, which forages at night. Only in L. venusta did the energy of droplet extension increase after the dark treatment, suggesting endogenous molecular alignment. This study adds UVB irradiation to the list of factors (humidity, temperature and strain rate) known to affect the performance of spider glycoprotein glue, factors that must be more fully understood if adhesives that mimic spider glycoprotein glue are to be produced.

  19. A Tapestry of Inquiry and Action: Cycle of Learning Weaves Its Way through Washington District

    ERIC Educational Resources Information Center

    Rasmussen, Harriette Thurber; Karschney, Kathryn

    2012-01-01

    Welcome to the West Valley School District in eastern Washington. Home to almost 4,000 students, West Valley made a public commitment more than seven years ago that all students would graduate with the option to attend college. This daunting goal--made even more so by the fact that almost half of the district's high school students come from…

  20. Brackish Bayou Blood: Weaving Mixed-Blood Indian-Creole Identity outside the Written Record

    ERIC Educational Resources Information Center

    Cranford-Gomez, L. Rain

    2008-01-01

    As a child on the Gulf of Mexico, evacuation to higher ground for floods, hurricanes, and tornado warnings were common. At the end of August 2005, Hurricane Katrina ravaged the homelands of this author's father and grandfather in Louisiana. Hundreds of miles of wetlands, already threatened, were turned to open water; vital brackish waters were…

  1. History of psychological knowledge in Brazilian culture: Weaving threads on the loom of time.

    PubMed

    Massimi, Marina; Gontijo, Sandro R

    2015-05-01

    After a brief presentation of the research program on the "history of psychological knowledge in the ambit of cultural history," this article addresses 2 issues that we consider particularly important from the methodological point of view: the notion of multiple temporalities (regimes of historicity) and of complexity as characteristics of the contexture of Brazilian culture. It will be shown how both require specific attention from the researcher, because the process of incorporation of psychology in Brazil over time is complex and articulated according to various regimes of historicity that intersect and interpenetrate each other, without being exclusive. Our approach will be exemplified by the concept of memory, showing how this can be grasped in its constitution in Brazilian culture, which is composed of several sedimented layers according to different temporalities.

  2. Weaving a Syllaweb: Consideration before Constructing an On-line Syllabus.

    ERIC Educational Resources Information Center

    Johnston, Joyce P.

    This paper explores the practical and philosophical issues involved in Web site construction so that the finished site truly reflects its creator. The author uses the term "syllaweb" for a hyperlinked syllabus and declares that it was an outgrowth of Vannevar Bush's original description of computerized graphical communication as a web, analogous…

  3. Weaving networks of responsibility: community work in development programs in rural Malawi.

    PubMed

    Rosenthal, Anat

    2012-01-01

    The need to cope with the impact of the AIDS epidemic on communities in Africa has resulted in the emergence of numerous community health and development programs. Initiated by governments, international nongovernmental organizations (NGOs), and local organizations, such programs target local communities with the goal of building care and support mechanisms in the local level. Based on ethnographic field research in rural Malawi, and drawing from the cross-disciplinary debate on development work, the article explores the work of an NGO offering health and care programs to orphans and vulnerable children. Through analyzing the organization's scope of work, the article demonstrates how the NGO acts to structure local social networks as instruments of care and offers a new reading of the role of NGOs in which the limitations of development work and the work of NGOs are understood within their local context and not only in the context of broad cultural critique. PMID:22881382

  4. In Practice: Weaving the Campus Safety Net by Integrating Student Health Issues into the Curriculum

    ERIC Educational Resources Information Center

    Olson, Todd A.; Riley, Joan B.

    2009-01-01

    Georgetown University has developed an innovative approach to addressing student health and wellness issues through curriculum infusion--a collaborative pedagogy that introduces real-life health issues faced by college students into their academic courses.

  5. A Tangled Weave: Tracing Outcomes of Education in Rural Women's Lives in North India

    ERIC Educational Resources Information Center

    Ghose, Malini; Mullick, Disha

    2015-01-01

    This paper is based on the findings of a research study which traced 56 rural women learners 15 years after they had participated in an empowerment and education programme in North India. It attempts to understand, from the perspectives of women from marginalised communities, the ways in which participating in the programme had been empowering for…

  6. Our North Carolina Stories Weaving Standards into a Fourth Grade Digital History Project

    ERIC Educational Resources Information Center

    Luke, Nancy; Binkley, Russell; Marotta, Naomi; Pirkl, Melissa

    2014-01-01

    This article describes a project that helped fourth-grade students connect personally with and bring North Carolina history to life. Over the months of this project, students asked questions, investigated topics of interest that they chose, conducted in-depth research that included interviewing experts, learned to use a video editor to combine…

  7. Cobweb-weaving spiders produce different attachment discs for locomotion and prey capture.

    PubMed

    Sahni, Vasav; Harris, Jared; Blackledge, Todd A; Dhinojwala, Ali

    2012-01-01

    Spiders' cobwebs ensnare both walking and flying prey. While the scaffolding silk can entangle flying insects, gumfoot silk threads pull walking prey off the ground and into the web. Therefore, scaffolding silk needs to withstand the impact of the prey, whereas gumfoot silk needs to easily detach from the substrate when contacted by prey. Here we show that spiders accomplish these divergent demands by creating attachment discs of two distinct architectures using the same pyriform silk. A 'staple-pin' architecture firmly attaches the scaffolding silk to the substrate and a previously unknown 'dendritic' architecture weakly attaches the gumfoot silk to the substrate. Gumfoot discs adhere weakly, triggering a spring-loaded trap, while the strong adhesion of scaffolding discs compels the scaffolding threads to break instead of detaching. We describe the differences in adhesion for these two architectures using tape-peeling models and design synthetic attachments that reveal important design principles for controlled adhesion. PMID:23033082

  8. Cob-Weaving Spiders Design Attachment Discs Differently for Locomotion and Prey Capture

    NASA Astrophysics Data System (ADS)

    Sahni, Vasav; Harris, Jared; Blackledge, Todd; Dhinojwala, Ali

    2013-03-01

    Spiders' cobwebs ensnare both walking and flying prey. While the scaffolding silk can entangle flying insects, gumfoot silk threads pull walking prey off the ground and into the web. Therefore, scaffolding silk needs to withstand the impact of the prey, whereas gumfoot silk needs to easily detach from the substrate when contacted by prey. Here, we show that spiders accomplish these divergent demands by creating attachment discs of two distinct architectures using the same pyriform silk. A ``staple-pin'' architecture firmly attaches the scaffolding silk to the substrate and a previously unknown ``dendritic'' architecture weakly attaches the gumfoot silk to the substrate. Gumfoot discs adhere weakly, triggering a spring-loaded trap, while the strong adhesion of scaffolding discs compels the scaffolding threads to break instead of detaching. We describe the differences in adhesion for these two architectures using tape-peeling models and design synthetic attachments that reveal important design principles for controlled adhesion. National Science Foundation

  9. Weaving the Fabric of Professional Development in the 21st Century Using Technology

    ERIC Educational Resources Information Center

    Chesbro, Patricia; Boxler, Nancy

    2010-01-01

    Network learning supported by 21-century technology is reweaving the fabric of how educators acquire and create new knowledge. At the Alaska Educational Innovations Network (AEIN), educators believe this has the potential to change how a profession looks at professional development. They have learned that using technology to support networks…

  10. Detritus decorations of an orb-weaving spider, Cyclosa mulmeinensis (Thorell): for food or camouflage?

    PubMed

    Tan, Eunice J; Li, Daiqin

    2009-06-01

    Many species of the orb-web spider genus Cyclosa often adorn their webs with decorations of prey remains, egg sacs and/or plant detritus, termed ;detritus decorations'. These detritus decorations have been hypothesised to camouflage the spider from predators or prey and thus reduce predation risk or increase foraging success. In the present study, we tested these two alternative hypotheses simultaneously using two types of detritus decorations (prey remain and egg sac) built by Cyclosa mulmeinensis (Thorell). By monitoring the possible responses of predators to spiders on their webs with and without decorations in the field, we tested whether web decorations would reduce the mortality of spiders. Wasp predators were observed to fly in the vicinity of webs with decorations slightly more often than in the vicinity of webs without decorations but there were very few attacks on spiders by wasps. By comparing the insect interception rates of webs with and without decorations in the field, we tested whether web decorations would increase the foraging success. Webs decorated with prey remains or egg sacs intercepted more insects than those without in the field. By calculating colour contrasts of both prey-remain and egg-sac decorations against spiders viewed by bird (blue tits) and hymenopteran (e.g. wasps) predators as well as hymenopteran (bees) prey, we showed that C. mulmeinensis spiders on webs with egg-sac decorations were invisible to both hymenopteran prey and predators and bird predators over short and long distances. While spiders on webs with prey-remain decorations were invisible to both hymenopterans and birds over short distances, spiders on webs with prey-remain decorations were visible to both predators and prey over long distances. Our results thus suggest that decorating webs with prey remains and egg sacs in C. mulmeinensis may primarily function as camouflage to conceal the spider from insects rather than as prey attractants, possibly contributing to the interception of more insect prey. However, the detritus decorations exhibit varying success as camouflage against predators, depending on whether predators are jumping spiders, wasps or birds, as well as on the decoration type. PMID:19483001

  11. A Fabric of Intelligence--How Our Supercomputing Network Is Weaving the Next Human Renaissance.

    ERIC Educational Resources Information Center

    Fierheller, George

    1994-01-01

    Provides the text of the 1993 Ian P. Sharp Lecture on Information Science that discussed issues concerning the global information network, particularly as they affect Canada. Highlights include the economic value of knowledge; information technology; effects on business; the global marketplace; effects on work practices; collaboration; social…

  12. Indians Weaving in Cyberspace Indigenous Urban Youth Cultures, Identities and Politics of Languages

    ERIC Educational Resources Information Center

    Jimenez Quispe, Luz

    2013-01-01

    This study is aimed at analyzing how contemporary urban Aymara youth hip hoppers and bloggers are creating their identities and are producing discourses in texts and lyrics to contest racist and colonial discourses. The research is situated in Bolivia, which is currently engaged in a cultural and political revolution supported by Indigenous…

  13. Wnt Drug Discovery: Weaving Through the Screens, Patents and Clinical Trials

    PubMed Central

    Lu, Benjamin; Green, Brooke A.; Farr, Jacqueline M.; Lopes, Flávia C.M.; Van Raay, Terence J.

    2016-01-01

    The Wnt signaling pathway is intricately involved in many aspects of development and is the root cause of an increasing number of diseases. For example, colorectal cancer is the second leading cause of death in the industrialized world and aberration of Wnt signaling within the colonic stem cell is the cause of more than 90% of these cancers. Despite our advances in successfully targeting other pathways, such as Human Epidermal Growth Factor Receptor 2 (HER2), there are no clinically relevant therapies available for Wnt-related diseases. Here, we investigated where research activities are focused with respect to Wnt signaling modulators by searching the United States Patent and Trade Office (USPTO) for patents and patent applications related to Wnt modulators and compared this to clinical trials focusing on Wnt modulation. We found that while the transition of intellectual property surrounding the Wnt ligand-receptor interface to clinical trials is robust, this is not true for specific inhibitors of β-catenin, which is constitutively active in many cancers. Considering the ubiquitous use of the synthetic T-cell Factor/Lymphoid Enhancer Factor (TCF/Lef) reporter system and its success in identifying novel modulators in vitro, we speculate that this model of drug discovery does not capture the complexity of in vivo Wnt signaling that may be required if we are to successfully target the Wnt pathway in the clinic. Notwithstanding, increasingly more complex models are being developed, which may not be high throughput, but more pragmatic in our pursuit to control Wnt signaling. PMID:27598201

  14. Fibers and combs: weaving a portable frequency reference in the near-IR

    NASA Astrophysics Data System (ADS)

    Corwin, Kristan

    2009-05-01

    Ten years after the advent of femtosecond optical frequency combs, they are now used for many applications. Here, we use near infrared combs to characterize and develop portable frequency references based on gas-filled hollow optical fibers. We explore the accuracy and stability of saturated absorption features in acetylene gas confined inside both 10 micron core diameter photonic bandgap fibers and ˜60 micron core diameter kagome-structured photonic crystal fibers. A cw fiber laser referenced to these features has resulted in stabilities of ˜10-11 in 1 s, competitive with iodine-stabilized HeNe lasers. Most of these studies have been performed using a femtosecond fiber laser that relies on a carbon nanotube saturable absorber. However, we have also explored Cr:forsterite femtosecond lasers with intracavity prisms, which reveal dramatic narrowing of the carrier-envelope offset beat when a knife edge is inserted in the cavity. Such observations and subsequent noise dynamics studies will lead to a better understanding of noise in these solid state combs, making Cr:forsterite laser combs more competitive for spectroscopy and other applications.

  15. What a Tangled Web We Weave: Hermus as the Northern Extension of the Phoenix Stream

    NASA Astrophysics Data System (ADS)

    Grillmair, Carl J.; Carlberg, Raymond G.

    2016-04-01

    We investigate whether the recently discovered Phoenix stream may be part of a much longer stream that includes the previously discovered Hermus stream. Using a simple model of the Galaxy with a disk, bulge, and a spherical dark matter halo, we show that a nearly circular orbit, highly inclined with respect to the disk, can be found that fits the positions, orientations, and distances of both streams. While the two streams are somewhat misaligned in the sense that they do not occupy the same plane, nodal precession due to the Milky Way disk potential naturally brings the orbit into line with each stream in the course of half an orbit. We consequently consider a common origin for the two streams as plausible. Based on our best-fitting orbit, we make predictions for the positions, distances, radial velocities, and proper motions along each stream. If our hypothesis is borne out by measurements, then at ≈183° (≈235° with respect to the Galactic center) and ≈76 kpc in length, Phoenix-Hermus would become the longest cold stream yet found. This would make it a particularly valuable new probe of the shape and mass of the Galactic halo out to ≈20 kpc.

  16. Weave Data into Learning: Support and Planning Are Key to Integrating Data Use into Teacher Practice

    ERIC Educational Resources Information Center

    Jimerson, Jo Beth

    2013-01-01

    Teachers and school leaders have been pressed to use data over the last few decades, and that pressure is increasing. Yet while data use has become a popular term among educators and politicians, evidence demonstrates that teachers and school leaders still struggle with making sense of data in the service of improved learning outcomes. To do this…

  17. “Basket weave technique” for medial patellofemoral ligament reconstruction: Clinical outcome of a prospective study

    PubMed Central

    Kodkani, Pranjal S

    2016-01-01

    Background: Bone tunneling and implants with rigid fixations for medial patellofemoral ligament (MPFL) reconstruction are known to compromise results and are avoidable, especially in skeletally immature subjects. This study was to assess if these deficiencies were overcome with the technique devised by the author which avoids implants and bone tunnels. Results were assessed for complication rate and outcome. Materials and Methods: Fifty six knees of recurrent lateral patellar dislocation were treated in the past 49 months by MPFL reconstruction. Thirty nine were female and 17 male knees. The mean age was 20.6 years (range 9-48 years). Mean followup was 26 months. Five knees had previously failed stabilization procedures. Thirty one cases had Dejours Type A or B and 12 had Type C trochlear dysplasia. Arthroscopy was performed for associated injuries and loose bodies. Seven knees required loose body removal. Five knees underwent lateral retinacular release. Four knees had tibial tuberosity transfer. One knee had an associated anterior cruciate ligament reconstruction. An anatomical MPFL reconstruction was performed using hamstring autograft without the need for intraoperative fluoroscopy. Only soft tissue fixation was necessary with this newly devised technique and suturing. A rapid rehabilitation protocol was implemented with monthly followup until normalcy and 6 monthly thereafter. Results: All achieved full range of motion and normal mediolateral stability. There was no recurrence of dislocation. No major surgery related complications. One patella fracture at 8 months was due to a fall developed terminal restriction of flexion. Those in sports could return to their sporting activities (Tegner 1–9). Cases with osteochondral fractures had occasional pain that subsided in 1 year. Mean Kujala score improved from 64.3 to 99.69 with KOOS score near normal in all. Conclusion: This new method of MPFL reconstruction gives excellent results. It avoids complications related to bone tunneling and implants. It is a safe, effective, reliable and reproducible technique. PMID:26952121

  18. Weaving Diversity into LIS: An Examination of Diversity Course Offerings in iSchool Programs

    ERIC Educational Resources Information Center

    Subramaniam, Mega M.; Jaeger, Paul T.

    2011-01-01

    This study examines the current state of diversity course offerings in Library and Information Science (LIS) programs through the analysis of syllabi of diversity-related courses offered in the American Library Association accredited Master of Library and Information Science (MLS) programs at iSchools (a group of information schools that include…

  19. Mathematics and Water in the Garden: Weaving Mathematics into the Students' Lived Environment

    ERIC Educational Resources Information Center

    Clarkson, Philip

    2010-01-01

    In an earlier issue of "Australian Primary Mathematics Classroom," Sparrow discussed the concept of real-world mathematics and the use of mathematics to explore problems in real-life situations. Environmental issues have provided a context that some teachers have used for teaching mathematics. An example of a particular environmental issue faced…

  20. High-Poverty Urban High School Students' Plans for Higher Education: Weaving Their Own Safety Nets

    ERIC Educational Resources Information Center

    Cilesiz, Sebnem; Drotos, Stephanie M.

    2016-01-01

    This qualitative study investigates high-poverty urban high school students' views of and plans regarding higher education, using Bourdieu's theory of reproduction in education as theoretical framework. Interview data from 76 students from six high-poverty urban schools in a metropolitan area in the Midwestern United States were analyzed using…

  1. QUALITY ASSURANCE: THE THREAD THAT WEAVES TOGETHER THE FABRIC OF DIVERSE DISCIPLINES

    EPA Science Inventory

    Mature Quality Assurance (QA) programs do not call for high quality! However, they most often demand known quality. We can intuitively sense quality in our daily lives.

    Protection of the environment is, in part, dependent on the quality of data used in decision making. Wh...

  2. Pore geometry in woven fiber structures: 0{degree}/90{degree} plain-weave cloth layup preform

    SciTech Connect

    Lee, S.; Stock, S.R.; Butts, M.D.; Starr, T.L.; Breunig, T.M.; Kinney, J.H.

    1998-05-01

    Composite preform fiber architectures range from the very simple to the complex, and the extremes are typified by parallel continuous fibers and complicated three-dimensional woven structures. Subsequent processing of these preforms to produce dense composites may depend critically on the geometry of the interfiber porosity. The goal of this study is to fully characterize the structure of a 0{degree}/90{degree} cloth layup preform using x-ray tomographic microscopy (XTM). This characterization includes the measurement of intercloth channel widths and their variability, the transverse distribution of through-cloth holes, and the distribution of preform porosity. The structure of the intercloth porosity depends critically on the magnitude and direction of the offset between adjacent cloth layers. The structures observed include two-dimensional networks of open pipes linking adjacent holes, arrays of parallel one-dimensional pipes linking holes, and relatively closed channels exhibiting little structure, and these different structures would appear to offer very different resistances to gas flow through the preform. These measurements, and future measurements for different fiber architectures, will yield improved understanding of the role of preform structure on processing. {copyright} {ital 1998 Materials Research Society.}

  3. Teacher Efficacy in Heterogeneous Fifth and Sixth Grade Classrooms: Weaving Teachers' Practices and Perspectives.

    ERIC Educational Resources Information Center

    Kronberg, Robi M.

    This report describes the outcomes of a study that examined teacher efficacy in order to generate an exploratory and explanatory theory of teacher efficacy in the context of four heterogeneous fifth and sixth grade classrooms. It investigated how the four elementary teachers identified as being efficacious described the relationships between…

  4. The ABCs of Teaching Alphabet Knowledge: Affordances and Challenges of "Weaving" Visible and Invisible Pedagogies

    ERIC Educational Resources Information Center

    Exley, Beryl; Richard-Bossez, Ariane

    2013-01-01

    As researchers interested in the pursuit of high-quality/high-equity literacy learning outcomes, the authors focus on the learning experiences of five early years French students, with a special regard for those who are already considered as being at risk of educational failure. The authors narrow the empirical focus to a single lesson on a…

  5. Weaving a Secure Web around Education: A Guide to Technology Standards and Security.

    ERIC Educational Resources Information Center

    National Forum on Education Statistics (ED/OERI), Washington, DC.

    The purpose of this guidebook is to assist education agencies and organizations--which include state education agencies or state departments of education, school districts, and schools--in the development, maintenance, and standardization of effective Web sites. Also included is a detailed examination of the procedures necessary to provide…

  6. The role of granules within viscous capture threads of orb-weaving spiders.

    PubMed

    Opell, B D; Hendricks, M L

    2010-01-15

    Sticky viscous prey capture threads form the spiral elements of spider orb-webs and are responsible for retaining insects that strike a web. These threads are formed of regularly spaced aqueous droplets that surround a pair of supporting axial fibers. When a thread is flattened on a microscope slide a small, opaque granule can usually be seen within each droplet. These granules have been thought to be the glycoprotein glue that imparts thread adhesion. Both independent contrast and standard regressions showed that granule size is directly related to droplet volume and indicated that granule volume is about 15% of droplet volume. We attempted to find support for the hypothesized adhesive role of granules by establishing an association between the contact surface area and volume of these granules and the stickiness of the viscous threads of 16 species in the context of a six-variable model that describes thread stickiness. However, we found that granule size made either an insignificant or a small negative contribution to thread stickiness. Consequently, we hypothesize that granules serve to anchor larger, surrounding layers of transparent glycoprotein glue to the axial fibers of the thread, thereby equipping droplets to resist slippage on the axial fibers as these droplets generate adhesion, elongate under a load, and transfer force to the axial fibers.

  7. Miniaturized orb-weaving spiders: behavioural precision is not limited by small size.

    PubMed

    Eberhard, William G

    2007-09-01

    The special problems confronted by very small animals in nervous system design that may impose limitations on their behaviour and evolution are reviewed. Previous attempts to test for such behavioural limitations have suffered from lack of detail in behavioural observations of tiny species and unsatisfactory measurements of their behavioural capacities. This study presents partial solutions to both problems. The orb-web construction behaviour of spiders provided data on the comparative behavioural capabilities of tiny animals in heretofore unparalleled detail; species ranged about five orders of magnitude in weight, from approximately 50-100mg down to some of the smallest spiders known (less than 0.005mg), whose small size is a derived trait. Previous attempts to quantify the 'complexity' of behaviour were abandoned in favour of using comparisons of behavioural imprecision in performing the same task. The prediction of the size limitation hypothesis that very small spiders would have a reduced ability to repeat one particular behaviour pattern precisely was not confirmed. The anatomical and physiological mechanisms by which these tiny animals achieve this precision and the possibility that they are more limited in the performance of higher-order behaviour patterns await further investigation.

  8. Reversible dielectric property degradation in moisture-contaminated fiber-reinforced laminates

    NASA Astrophysics Data System (ADS)

    Rodriguez, Luis A.; García, Carla; Fittipaldi, Mauro; Grace, Landon R.

    2016-03-01

    The potential for recovery of dielectric properties of three water-contaminated fiber-reinforced laminates is investigated using a split-post dielectric resonant technique at X-band (10 GHz). The three material systems investigated are bismaleimide (BMI) reinforced with an eight-harness satin weave quartz fabric, an epoxy resin reinforced with an eight- harness satin weave glass fabric (style 7781), and the same epoxy reinforced with a four-harness woven glass fabric (style 4180). A direct correlation between moisture content, dielectric constant, and loss tangent was observed during moisture absorption by immersion in distilled water at 25 °C for five equivalent samples of each material system. This trend is observed through at least 0.72% water content by weight for all three systems. The absorption of water into the BMI, 7781 epoxy, and 4180 epoxy laminates resulted in a 4.66%, 3.35%, and 4.01% increase in dielectric constant for a 0.679%, 0.608%, and 0.719% increase in water content by weight, respectively. Likewise, a significant increase was noticed in loss tangent for each material. The same water content is responsible for a 228%, 71.4%, and 64.1% increase in loss tangent, respectively. Subsequent to full desorption through drying at elevated temperature, the dielectric constant and loss tangent of each laminate exhibited minimal change from the dry, pre-absorption state. The dielectric constant and loss tangent change after the absorption and desorption cycle, relative to the initial state, was 0.144 % and 2.63% in the BMI, 0.084% and 1.71% in the style 7781 epoxy, and 0.003% and 4.51% in the style 4180 epoxy at near-zero moisture content. The similarity of dielectric constant and loss tangent in samples prior to absorption and after desorption suggests that any chemical or morphological changes induced by the presence of water have not caused irreversible changes in the dielectric properties of the laminates.

  9. Investigation of Effects of Material Architecture on the Elastic Response of a Woven Ceramic Matrix Composite

    NASA Technical Reports Server (NTRS)

    Goldberg, Robert K.; Bonacuse, Peter J.; Mital, Subodh K.

    2012-01-01

    To develop methods for quantifying the effects of the microstructural variations of woven ceramic matrix composites on the effective properties and response of the material, a research program has been undertaken which is described in this paper. In order to characterize and quantify the variations in the microstructure of a five harness satin weave, CVI SiC/SiC, composite material, specimens were serially sectioned and polished to capture images that detailed the fiber tows, matrix, and porosity. Open source quantitative image analysis tools were then used to isolate the constituents and collect relevant statistics such as within ply tow spacing. This information was then used to build two dimensional finite element models that approximated the observed section geometry. With the aid of geometrical models generated by the microstructural characterization process, finite element models were generated and analyses were performed to quantify the effects of the microstructure and its variation on the effective stiffness and areas of stress concentration of the material. The results indicated that the geometry and distribution of the porosity appear to have significant effects on the through-thickness modulus. Similarly, stress concentrations on the outer surface of the composite appear to correlate to regions where the transverse tows are separated by a critical amount.

  10. High Dose Neutron Irradiation of Hi-Nicalon Type S Silicon Carbide Composites, Part 2. Mechanical and Physical Properties

    DOE PAGES

    Katoh, Yutai; Nozawa, Takashi; Shih, Chunghao Phillip; Ozawa, Kazumi; Koyanagi, Takaaki; Porter, Wallace D; Snead, Lance Lewis

    2015-01-07

    Nuclear-grade silicon carbide (SiC) composite material was examined for mechanical and thermophysical properties following high-dose neutron irradiation in the High Flux Isotope Reactor at a temperature range of 573–1073 K. Likewise, the material was chemical vapor-infiltrated SiC-matrix composite with a two-dimensional satin weave Hi-Nicalon Type S SiC fiber reinforcement and a multilayered pyrocarbon/SiC interphase. Moderate (1073 K) to very severe (573 K) degradation in mechanical properties was found after irradiation to >70 dpa, whereas no evidence was found for progressive evolution in swelling and thermal conductivity. The swelling was found to recover upon annealing beyond the irradiation temperature, indicating themore » irradiation temperature, but only to a limited extent. Moreover, the observed strength degradation is attributed primarily to fiber damage for all irradiation temperatures, particularly a combination of severe fiber degradation and likely interphase damage at relatively low irradiation temperatures.« less

  11. Tension-Compression Fatigue of a Nextel™720/alumina Composite at 1200 °C in Air and in Steam

    NASA Astrophysics Data System (ADS)

    Lanser, R. L.; Ruggles-Wrenn, M. B.

    2016-08-01

    Tension-compression fatigue behavior of an oxide-oxide ceramic-matrix composite was investigated at 1200 °C in air and in steam. The composite is comprised of an alumina matrix reinforced with Nextel™720 alumina-mullite fibers woven in an eight harness satin weave (8HSW). The composite has no interface between the fiber and matrix, and relies on the porous matrix for flaw tolerance. Tension-compression fatigue behavior was studied for cyclical stresses ranging from 60 to 120 MPa at a frequency of 1.0 Hz. The R ratio (minimum stress to maximum stress) was -1.0. Fatigue run-out was defined as 105 cycles and was achieved at 80 MPa in air and at 70 MPa in steam. Steam reduced cyclic lives by an order of magnitude. Specimens that achieved fatigue run-out were subjected to tensile tests to failure to characterize the retained tensile properties. Specimens subjected to prior cyclic loading in air retained 100 % of their tensile strength. The steam environment severely degraded tensile properties. Tension-compression cyclic loading was considerably more damaging than tension-tension cyclic loading. Composite microstructure, as well as damage and failure mechanisms were investigated.

  12. Probabilistic Analysis of a SiC/SiC Ceramic Matrix Composite Turbine Vane

    NASA Technical Reports Server (NTRS)

    Murthy, Pappu L. N.; Nemeth, Noel N.; Brewer, David N.; Mital, Subodh

    2004-01-01

    To demonstrate the advanced composite materials technology under development within the Ultra-Efficient Engine Technology (UEET) Program, it was planned to fabricate, test, and analyze a turbine vane made entirely of silicon carbide-fiber-reinforced silicon carbide matrix composite (SiC/SiC CMC) material. The objective was to utilize a five-harness satin weave melt-infiltrated (MI) SiC/SiC composite material developed under this program to design and fabricate a stator vane that can endure 1000 hours of engine service conditions. The vane was designed such that the expected maximum stresses were kept within the proportional limit strength of the material. Any violation of this design requirement was considered as the failure. This report presents results of a probabilistic analysis and reliability assessment of the vane. Probability of failure to meet the design requirements was computed. In the analysis, material properties, strength, and pressure loading were considered as random variables. The pressure loads were considered normally distributed with a nominal variation. A temperature profile on the vane was obtained by performing a computational fluid dynamics (CFD) analysis and was assumed to be deterministic. The results suggest that for the current vane design, the chance of not meeting design requirements is about 1.6 percent.

  13. Two-Dimensional Nonlinear Finite Element Analysis of CMC Microstructures

    NASA Technical Reports Server (NTRS)

    Mital, Subodh K.; Goldberg, Robert K.; Bonacuse, Peter J.

    2012-01-01

    A research program has been developed to quantify the effects of the microstructure of a woven ceramic matrix composite and its variability on the effective properties and response of the material. In order to characterize and quantify the variations in the microstructure of a five harness satin weave, chemical vapor infiltrated (CVI) SiC/SiC composite material, specimens were serially sectioned and polished to capture images that detailed the fiber tows, matrix, and porosity. Open source quantitative image analysis tools were then used to isolate the constituents, from which two dimensional finite element models were generated which approximated the actual specimen section geometry. A simplified elastic-plastic model, wherein all stress above yield is redistributed to lower stress regions, is used to approximate the progressive damage behavior for each of the composite constituents. Finite element analyses under in-plane tensile loading were performed to examine how the variability in the local microstructure affected the macroscopic stress-strain response of the material as well as the local initiation and progression of damage. The macroscopic stress-strain response appeared to be minimally affected by the variation in local microstructure, but the locations where damage initiated and propagated appeared to be linked to specific aspects of the local microstructure.

  14. Analysis of the Numerical and Geometrical Parameters Influencing the Simulation of Mode I and Mode II Delamination Growth in Unidirectional and Textile Composites

    NASA Astrophysics Data System (ADS)

    Jacques, S.; De Baere, I.; Van Paepegem, W.

    2015-12-01

    The reliability of composite structures depends, among other damage mechanisms, on their ability to withstand delaminations. In order to have a better understanding of the cohesive zone method technique for delamination simulations, a complete analysis of the multiple parameters influencing the results is necessary. In this paper the work is concentrated on the cohesive zone method using cohesive elements. First a summary of the theory of the cohesive zone method is given. A numerical investigation on the multiple parameters influencing the numerical simulation of the mode I and mode II delamination tests has been performed. The parameters such as the stabilization method, the output frequency, the friction and the computational efficiency have been taken into account. The results will be compared to an analytical solution obtained by linear elastic fracture mechanics. Additionally the numerical simulation results will be compared to the experimental results of a glass-fibre reinforced composite material for the mode I Double Cantilever Beam (DCB) and to a carbon fibre 5-harness satin weave reinforced polyphenylene sulphide composite for the mode I DCB and mode II End Notched Flexure (ENF).

  15. Processing, properties and applications of composites using powder-coated epoxy towpreg technology

    NASA Technical Reports Server (NTRS)

    Bayha, T. D.; Osborne, P. P.; Thrasher, T. P.; Hartness, J. T.; Johnston, N. J.; Marchello, J. M.; Hugh, M. K.

    1993-01-01

    Composite manufacturing using the current prepregging technology of impregnating liquid resin into three-dimensionally reinforced textile preforms can be a costly and difficult operation. Alternatively, using polymer in the solid form, grinding it into a powder, and then depositing it onto a carbon fiber tow prior to making a textile preform is a viable method for the production of complex textile shapes. The powder-coated towpreg yarn is stable, needs no refrigeration, contains no solvents and is easy to process into various woven and braided preforms for later consolidation into composite structures. NASA's Advanced Composites Technology (ACT) program has provided an avenue for developing the technology by which advanced resins and their powder-coated preforms may be used in aircraft structures. Two-dimensional braiding and weaving studies using powder-coated towpreg have been conducted to determine the effect of resin content, towpreg size and twist on textile composite properties. Studies have been made to customize the towpreg to reduce friction and bulk factor. Processing parameters have been determined for three epoxy resin systems on eight-harness satin fabric, and on more advanced 3-D preform architectures for the downselected resin system. Processing effects and the resultant mechanical properties of these textile composites will be presented and compared.

  16. Modeling of Damage Initiation and Progression in a SiC/SiC Woven Ceramic Matrix Composite

    NASA Technical Reports Server (NTRS)

    Mital, Subodh K.; Goldberg, Robert K.; Bonacuse, Peter J.

    2012-01-01

    The goal of an ongoing project at NASA Glenn is to investigate the effects of the complex microstructure of a woven ceramic matrix composite and its variability on the effective properties and the durability of the material. Detailed analysis of these complex microstructures may provide clues for the material scientists who `design the material? or to structural analysts and designers who `design with the material? regarding damage initiation and damage propagation. A model material system, specifically a five-harness satin weave architecture CVI SiC/SiC composite composed of Sylramic-iBN fibers and a SiC matrix, has been analyzed. Specimens of the material were serially sectioned and polished to capture the detailed images of fiber tows, matrix and porosity. Open source analysis tools were used to isolate various constituents and finite elements models were then generated from simplified models of those images. Detailed finite element analyses were performed that examine how the variability in the local microstructure affected the macroscopic behavior as well as the local damage initiation and progression. Results indicate that the locations where damage initiated and propagated is linked to specific microstructural features.

  17. Geographical distribution of the space-weaving spider, Chibchea salta, from northwestern Argentina: New records and bioclimatic modeling.

    PubMed

    Rubio, Gonzalo D; Acosta, Luis E

    2011-01-01

    New records of the spider Chibchea salta Huber 2000 (Araneae, Pholcidae) from northwestern Argentina are provided, and the potential range of this species is modeled. Two presence-only methods, Maxent and Bioclim, were run using 19 bioclimatic parameters at a resolution of 30 arc seconds. The climatic profile of C. salta is described, and the relative importance of the bioclimatic variables is explored. Temperature variables proved to be more decisive to the final range shape. The range predicted with Maxent is slightly larger than with Bioclim, but the latter appears to be more sensitive to the record set bias. Both methods performed well, resulting in predictive ranges consistent with the yungas ecoregion. These results provide an initial insight into the bioclimatic tolerance of C. salta, and by identifying potential areas with no records, such as the sierras on the Salta-Jujuy border, they also help in identifying sites for future sampling efforts.

  18. Weaving a Fabric of World History? An Analysis of U.S. State High School World History Standards

    ERIC Educational Resources Information Center

    Marino, Michael; Bolgatz, Jane

    2010-01-01

    Understanding world history is critical for our development as citizens in our interconnected society. Yet it is not clear that the standards for world history courses in the U.S. foster understanding of the whole world or of its history. The authors argue that the high school world history standards mapped out by various states promulgate a…

  19. The Wisdom of Webs A-Weaving: Adult Education and the Paradoxes of Complexity in Changing Times

    ERIC Educational Resources Information Center

    Tisdell, Elizabeth J.

    2011-01-01

    In this article, the author begins by providing an overview of the literature on wisdom itself and then considers what some of its insights might suggest for dealing with a few current challenges facing the field of adult education. This article is grounded in two basic assumptions: (1) that there is an integration quality to wisdom that attends…

  20. Combining morphology, DNA sequences, and morphometrics: revising closely related species in the orb-weaving spider genus Araniella (Araneae, Araneidae).

    PubMed

    Spasojevic, Tamara; Kropf, Christian; Nentwig, Wolfgang; Lasut, Liana

    2016-01-01

    The integration of independent data sets could solve problems in both traditional and DNA-based taxonomy. The aim of this study is to investigate the power of CO1 sequences and of morphometrics to distinguish closely related species in the spider genus Araniella. We put special emphasis on the species pair A. cucurbitina (Clerck, 1757) and A. opisthographa (Kulczyński, 1905) since the females are morphologically difficult to distinguish and often misidentified. A total of 216 sequences of eight Araniella species from seven European countries, North America and Asia were included in the molecular analysis. The results from both maximum likelihood and Bayesian phylogenetic inference indicate successful separation of six out of eight Araniella species, including A. cucurbitina and A. opisthographa. For the same six species, we detect no overlap of intra- and interspecific genetic divergence, leading to successful species identification with a threshold approach. In addition, morphometric analysis of the epigyna of A. cucurbitina and A. opisthographa supports species separation by two best explanatory ratios: receptaculum length and distance between receptaculum and copulatory duct. Although a small overlap in the ratios exists, the species identification rate increases when combining morphometric and molecular data, which demonstrates the efficiency of integrative approaches for distinguishing closely related species. However, none of the molecular approaches was able to separate closely related A. alpica (L. Koch, 1869) and A. inconspicua (Simon, 1874) due to shared CO1 haplotypes. Considering the clear morphological separation of the males and different habitat preferences, incomplete lineage sorting or introgressive hybridization could have led to identical CO1 sequences. Therefore, DNA-barcoding must be thoroughly tested even within small homogenous genera of spiders. PMID:27395098

  1. Folk Arts--Traditional Arts of Greece: Art Activities with Fibers, Fabrics and Weaving for Young Children.

    ERIC Educational Resources Information Center

    Nikoltsos, Catherine

    This paper describes a developmental arts activities program for preschool children centered on traditional Greek arts. The program's elements include discussion and observation of traditional arts, collection and categorization of textile materials, manipulation of the materials, production and work with the materials to construct various designs…

  2. Weaving Silos--A Leadership Challenge: A Cross-Functional Team Approach to Supporting Web-Based Student Services

    ERIC Educational Resources Information Center

    Kleemann, Gary L.

    2005-01-01

    The author reviews the evolution of Web services--from information sharing to transactional to relationship building--and the progression from first-generation to fourth-generation Web sites. (Contains 3 figures.)

  3. More data, fewer shifts: molecular insights into the evolution of the spinning apparatus in non-orb-weaving spiders.

    PubMed

    Spagna, Joseph C; Gillespie, Rosemary G

    2008-01-01

    All spiders produce silk and use it for various functions throughout their lives, but not all spiders produce the same silks, or use them for the same functions. These functions may include building shelters, protecting eggs, and trapping prey. The "RTA clade" of spiders (grass spiders, jumping-spiders, wolf spiders, hackled-band weavers, etc.) is an extremely diverse group ( approximately 18,000 species, representing nearly half of all described species), with great variation in ecology and morphology, including variation in the cribellum, a specialized silk-producing organ. The loss of the cribellum, a structure that produces fibers contributing stickiness to prey snares and which is invariably associated with a set of accessory structures, has been studied in orb-web-weavers and shown to have been lost once during the evolutionary history of the group, but never regained. Relative to the orb-weavers, evolution of the structure remains less-thoroughly studied in the RTA clade. As the cribellum is one member of a suite of traits, the combined action of which is essential in prey-capture, its loss should have ecological correlates or physiological trade-offs of evolutionary interest. Using molecular data from nuclear genes (ribosomal DNAs 18S and 28S, and protein-coding Histone H3), as well as mitochondrial data (Cytochrome oxidase I) totaling approximately 3400 base pairs, we developed a phylogenetic hypothesis for three-clawed lineages in this group, focusing on families where taxonomy and previous cladistic analyses suggest multiple losses, or possibly loss and secondary gain, of the cribellum. Results of Bayesian and direct-optimization (POY) analyses agree on a well-resolved and robust agelenid clade that includes the putative subfamilies Ageleninae, Tegenariinae, Textricinae and Coelotinae, but excludes the cribellate New Zealand genus Neoramia. Optimizing the pattern of cribellum evolution onto these trees shows that the cribellate state is conserved in large clades and has undergone fewer shifts than current taxonomy implies. The dominant pattern is one of repeated loss of the cribellum, though loss and regain remains a possibility in some groups.

  4. Geographical Distribution of the Space-Weaving Spider, Chibchea salta, from Northwestern Argentina: New Records and Bioclimatic Modeling

    PubMed Central

    Rubio, Gonzalo D.; Acosta, Luis E.

    2011-01-01

    New records of the spider Chibchea salta Huber 2000 (Araneae, Pholcidae) from northwestern Argentina are provided, and the potential range of this species is modeled. Two presence-only methods, Maxent and Bioclim, were run using 19 bioclimatic parameters at a resolution of 30 arc seconds. The climatic profile of C. salta is described, and the relative importance of the bioclimatic variables is explored. Temperature variables proved to be more decisive to the final range shape. The range predicted with Maxent is slightly larger than with Bioclim, but the latter appears to be more sensitive to the record set bias. Both methods performed well, resulting in predictive ranges consistent with the yungas ecoregion. These results provide an initial insight into the bioclimatic tolerance of C. salta, and by identifying potential areas with no records, such as the sierras on the Salta-Jujuy border, they also help in identifying sites for future sampling efforts. PMID:21861658

  5. 25 CFR 309.13 - What are examples of other weaving and textiles that are Indian products?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ..., including, but not limited to, cornhusk, raffia, tule, horsehair, cotton, wool, fiber, linen, rabbit skin..., star quilts, pictorial appliqué wall hangings, fiber woven bags, embroidered dance shawls, rabbit...

  6. 25 CFR 309.13 - What are examples of other weaving and textiles that are Indian products?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ..., including, but not limited to, cornhusk, raffia, tule, horsehair, cotton, wool, fiber, linen, rabbit skin..., star quilts, pictorial appliqué wall hangings, fiber woven bags, embroidered dance shawls, rabbit...

  7. Weaving Transnational Feminist(s) Methodologies: (Re)Examining Early Childhood Linguistic Diversity Teacher Training and Research

    ERIC Educational Resources Information Center

    Saavedra, Cinthya M.; Chakravarthi, Swetha; Lower, Joanna K.

    2009-01-01

    The purpose of this article is to engender a space where a variety of critical feminist(s) lenses are interwoven to problematize current discursive practices in linguistic diversity training and to (re)imagine "nueavas posibilidades" for linguistic diversity research/training for pre-kindergarten teachers. Transnational feminists' projects have…

  8. More data, fewer shifts: molecular insights into the evolution of the spinning apparatus in non-orb-weaving spiders.

    PubMed

    Spagna, Joseph C; Gillespie, Rosemary G

    2008-01-01

    All spiders produce silk and use it for various functions throughout their lives, but not all spiders produce the same silks, or use them for the same functions. These functions may include building shelters, protecting eggs, and trapping prey. The "RTA clade" of spiders (grass spiders, jumping-spiders, wolf spiders, hackled-band weavers, etc.) is an extremely diverse group ( approximately 18,000 species, representing nearly half of all described species), with great variation in ecology and morphology, including variation in the cribellum, a specialized silk-producing organ. The loss of the cribellum, a structure that produces fibers contributing stickiness to prey snares and which is invariably associated with a set of accessory structures, has been studied in orb-web-weavers and shown to have been lost once during the evolutionary history of the group, but never regained. Relative to the orb-weavers, evolution of the structure remains less-thoroughly studied in the RTA clade. As the cribellum is one member of a suite of traits, the combined action of which is essential in prey-capture, its loss should have ecological correlates or physiological trade-offs of evolutionary interest. Using molecular data from nuclear genes (ribosomal DNAs 18S and 28S, and protein-coding Histone H3), as well as mitochondrial data (Cytochrome oxidase I) totaling approximately 3400 base pairs, we developed a phylogenetic hypothesis for three-clawed lineages in this group, focusing on families where taxonomy and previous cladistic analyses suggest multiple losses, or possibly loss and secondary gain, of the cribellum. Results of Bayesian and direct-optimization (POY) analyses agree on a well-resolved and robust agelenid clade that includes the putative subfamilies Ageleninae, Tegenariinae, Textricinae and Coelotinae, but excludes the cribellate New Zealand genus Neoramia. Optimizing the pattern of cribellum evolution onto these trees shows that the cribellate state is conserved in large clades and has undergone fewer shifts than current taxonomy implies. The dominant pattern is one of repeated loss of the cribellum, though loss and regain remains a possibility in some groups. PMID:17928240

  9. The orb-weaving spider genus Chrysometa in Uruguay: distribution and description of a new species (Araneae, Tetragnathidae).

    PubMed

    Simó, Miguel; Álvarez, Luis; Laborda, Álvaro

    2016-01-01

    The spider genus Chrysometa Simon, 1895 comprises 138 species of small (3-5 mm) Neotropical orb-weavers spiders (Nogueira et al. 2011; World Spider Catalogue 2015) mainly associated with arboreal vegetation from intermediate to low altitude forests (Levi 1986). Males of Chrysometa differ from other tetragnathids by having the palpal tibial length approximately as long as its widest point; paracymbium articulated and with several apophyses located at both ends; male cephalic region narrower than in the female and having cymbial ectobasal and ectomedian processes. Females are diagnosed by having femora without trichobothria; abdomen covered with silver guanine patches; a flat epigynum and also by their fertilization ducts originating anteriorly and crossing over the spermathecae (Levi 1986; Alvarez-Padilla & Hormiga 2011). PMID:27395900

  10. Weaving Common Threads: Reaching out to American Indians and Native Peoples of Alaska and the Pacific Islands

    NASA Technical Reports Server (NTRS)

    2002-01-01

    This report outlines the activities of the GLOBE (Global Learning and Observations to Benefit the Environment) Train-the-Trainer Workshop. Educators were introduced to the GLOBE protocols for Atmosphere, Hydrology, Soil and Land Cover. These protocols included measurement of pH, temperature, precipitation, salinity, and soil moisture content. Each topic included implementation plans and learning activities.

  11. Weaving Webs of Intrigue: Classical Mythology and Analytic Crime Fiction in Rubem Fonseca's "A grande arte"

    ERIC Educational Resources Information Center

    Ginway, M. Elizabeth

    2013-01-01

    This study focuses on some of the classical features of Rubem Fonseca's "A grande arte" (1983) in order to emphasize the puzzle-solving tradition of the detective novel that is embedded within Fonseca's crime thriller, producing a work that does not entirely fit into traditional divisions of detective, hardboiled, or crime…

  12. Weaving Colors into a White Landscape: Unpacking the Silences in Karen Hesse's Children's Novel "Out of the Dust"

    ERIC Educational Resources Information Center

    Simon, Lisa

    2008-01-01

    The children's novel "Out of the Dust" (Hesse, 1997) is an evocative portrayal of the drought and dust storms that devastated Midwestern farms in the 1930s. Through the voice of her 13-year-old narrator, Karen Hesse intertwines history and free verse poetry to create what many readers find to be a moving depiction of the Oklahoma Dustbowl…

  13. RU SciTech: Weaving Astronomy and Physics into a University-sponsored Summer Camp for Middle School Students

    NASA Astrophysics Data System (ADS)

    Hart, Quyen N.

    2015-01-01

    We present a successful model for organizing a small University-sponsored summer camp that integrates astronomy and physics content with other science disciplines and computer programming content. The aim of our science and technology camp is to engage middle school students in a wide array of critical thinking tasks and hands-on activities centered on science and technology. Additionally, our program seeks to increase and maintain STEM interest among children, particularly in under-represented populations (e.g., Hispanic, African-American, women, and lower socioeconomic individuals) with hopes of decreasing disparities in diversity across many STEM fields.During this four-day camp, organized and facilitated by faculty volunteers, activities rotated through many STEM modules, including optics, telescopes, circuit building, computer hardware, and programming. Specifically, we scaffold camp activities to build upon similar ideas and content if possible. Using knowledge and skills gained through the AAS Astronomy Ambassadors program, we were able to integrate several astronomy activities into the camp, leading students through engaging activities, and conduct educational research. We present best practices on piloting a similar program in a university environment, our efforts to connect the learning outcomes common across all the modules, specifically in astronomy and physics, outline future camp activities, and the survey results on the impact of camp activities on attitudes toward science, technology, and science careers.

  14. Interactions between Spider Silk and Cells – NIH/3T3 Fibroblasts Seeded on Miniature Weaving Frames

    PubMed Central

    Kuhbier, Joern W.; Allmeling, Christina; Reimers, Kerstin; Hillmer, Anja; Kasper, Cornelia; Menger, Bjoern; Brandes, Gudrun; Guggenheim, Merlin; Vogt, Peter M.

    2010-01-01

    Background Several materials have been used for tissue engineering purposes, since the ideal matrix depends on the desired tissue. Silk biomaterials have come to focus due to their great mechanical properties. As untreated silkworm silk has been found to be quite immunogenic, an alternative could be spider silk. Not only does it own unique mechanical properties, its biocompatibility has been shown already in vivo. In our study, we used native spider dragline silk which is known as the strongest fibre in nature. Methodology/Principal Findings Steel frames were originally designed and manufactured and woven with spider silk, harvesting dragline silk directly out of the animal. After sterilization, scaffolds were seeded with fibroblasts to analyse cell proliferation and adhesion. Analysis of cell morphology and actin filament alignment clearly revealed adherence. Proliferation was measured by cell count as well as determination of relative fluorescence each after 1, 2, 3, and 5 days. Cell counts for native spider silk were also compared with those for trypsin-digested spider silk. Spider silk specimens displayed less proliferation than collagen- and fibronectin-coated cover slips, enzymatic treatment reduced adhesion and proliferation rates tendentially though not significantly. Nevertheless, proliferation could be proven with high significance (p<0.01). Conclusion/Significance Native spider silk does not require any modification to its application as a biomaterial that can rival any artificial material in terms of cell growth promoting properties. We could show adhesion mechanics on intracellular level. Additionally, proliferation kinetics were higher than in enzymatically digested controls, indicating that spider silk does not require modification. Recent findings concerning reduction of cell proliferation after exposure could not be met. As biotechnological production of the hierarchical composition of native spider silk fibres is still a challenge, our study has a pioneer role in researching cellular mechanics on native spider silk fibres. PMID:20711495

  15. Web-building management in an orb-weaving spider, Zygiella x-notata: influence of prey and conspecifics.

    PubMed

    Thévenard, Laurent; Leborgne, Raymond; Pasquet, Alain

    2004-01-01

    According to optimal foraging theory, spiders should adapt their web building to environmental variations. Until now, there was no data on the influence of simultaneous information coming from different environmental factors on web building behaviour. Under laboratory conditions, we studied the behaviour of Zygiella x-notata in the presence of prey, conspecifics, or both simultaneously. There was a stimulating effect of prey, but web building was not affected by the presence of conspecifics. When spiders and prey were present simultaneously, the effect was similar to that of prey alone; it seemed that there was no interactive influence of both factors. We discussed about the use of environmental information by spiders in foraging behaviour.

  16. Lifetime Response of a Hi-Nicalon Fiber-Reinforced Melt-Infiltrated SiC Matrix Composites

    SciTech Connect

    Becher, P.F.; Lin, H.T.; Singh, M.

    1999-04-25

    Lifetime studies in four-point flexure were performed on a Hi-NicalonTM fiber-reinforced SiC matrix composite over a temperature range of 700 degrees to 1150 degrees C in air. The composite consisted of ~40 vol. % Hi-NicalonTM fiber (8-harness weave) with a 0.5 Mu-m BN fiber coating and a melt-infiltration SiC matrix wand was tested with as-machined surfaces. Lifetime results indicated that the composite exhibited a stress-dependent lifetime at stress levels above an apparent fatigue limit, similar to the trend observed in CG-NicalonTM fiber reinforced CVI SiC matrix composites. At less than or equal to 950 degrees C, the lifetimes of Hi-Nicalon/MI SiC composites decreased with increasing applied stress level and test temperature. However, the lifetimes were extended as test temperature increased from 950 degees to 1150 degrees C as a result of surface crack sealing due to glass formation by the oxidation of Mi SiC matrix. The lifetime governing processes were, in general, attributed to the progressive oxidation of BN fiber coating and formation of glassy phase, which formed a strong bond between fiber and matrix, resulting in embrittlement of the composite with time.

  17. Modeling of fracture and durability of paste-bonded composite joints subjected to hygro-thermal-mechanical loading

    NASA Astrophysics Data System (ADS)

    Harris, David Lee

    The objective of the research is to characterize the behavior of composite/composite joints with paste adhesive using both experimental testing and analytical modeling. In comparison with the conventional tape adhesive, joining composites using paste adhesive provides several advantages. The carbon fiber laminate material systems employed in this study included IM7 carbon fibers and 977-3 epoxy matrix assembled in prepreg tape, and AS4 carbon fibers and 977-3 epoxy matrix as a five-harness satin weave. The adhesive employed was EA 9394 epoxy. All laminates and test specimens were fabricated and inspected by Boeing using their standard propriety procedures. Three types of test specimens were used in the program. They were bonded double-lap shear (DLS), bonded double cantilever beam (DCB) and bonded interlaminar tension (ILT) specimens. A group of specimens were conditioned at elevated temperature and humidity in an environmental chamber at Boeing's facility and their moisture absorption recorded with time. Specimens were tested at room temperature dry and elevated temperatures. DCB and DLS specimens were tested in fatigue as well as static conditions. Two-dimensional finite element models of the three configurations were developed for determining stresses and strains using the ABAQUS finite element package code. Due to symmetry, only the one-half of the specimen needed to be considered thus reducing computational time. The effect of the test fixture is not taken into account instead equivalent distributed stresses are applied directly on the composite laminates. For each of the specimen, the distribution of Mises stress and the first strain invariant J1 are obtained to identify potential failure locations within a specimen.

  18. New design of textile light diffusers for photodynamic therapy.

    PubMed

    Cochrane, Cédric; Mordon, Serge R; Lesage, Jean Claude; Koncar, Vladan

    2013-04-01

    A homogeneous and reproducible fluence delivery rate during clinical photodynamic therapy (PDT) plays a determinant role in preventing under- or overtreatment. PDT applied in dermatology has been carried out with a wide variety of light sources delivering a broad range of more or less adapted light doses. Due to the complexities of the human anatomy, these light sources do not in fact deliver a uniform light distribution to the skin. Therefore, the development of flexible light sources would considerably improve the homogeneity of light delivery. The integration of plastic optical fiber (POF) into textile structures could offer an interesting alternative. In this article, a textile light diffuser (TLD) has been developed using POF and Polyester yarns. Predetermined POF macrobending leads to side emission of light when the critical angle is exceeded. Therefore, a specific pattern based on different satin weaves has been developed in order to improve light emission homogeneity and to correct the decrease of side emitted radiation intensity along POF. The prototyped fabrics (approximately 100 cm(2): 5×20 cm) were woven using a hand loom, then both ends of the POF were coupled to a laser diode (5 W, 635 nm). The fluence rate (mW/ cm(2)) and the homogeneity of light delivery by the TLD were evaluated. Temperature evolution, as a function of time, was controlled with an infrared thermographic camera. When using a power source of 5 W, the fluence rate of the TLD was 18±2.5 mw/cm(2). Due to the high efficiency of the TLD, the optical losses were very low. The TLD temperature elevation was 0.6 °C after 10 min of illumination. Our TLD meets the basic requirements for PDT: homogeneous light distribution and flexibility. It also proves that large (500 cm(2)) textile light diffusers adapted to skin, but also to peritoneal or pleural cavity, PDTs can be easily produced by textile manufacturing processes.

  19. Impact response of graphite/epoxy fabric structures

    NASA Technical Reports Server (NTRS)

    Lagace, Paul A.; Kraft, Michael J.

    1990-01-01

    The impact damage resistance and damage tolerance of graphite/epoxy fabric plate (coupon) and cylinder structures were investigated and compared in an analytical and experimental study. Hercules A370-5H/3501-6 five-harness satin weave cloth in a quasi-isotropic (0,45)(sub s) laminate configuration was utilized. Specimens were impacted with 12.7 mm diameter steel spheres at velocities ranging from 10 m/s to 100 m/s. Damage resistance of the specimens was determined through the use of dye penetrant enhanced x-radiography, sectioning, epoxy burnoff, and visual methods. Damage tolerance of the flat plate structures was assessed in a residual tensile test while damage tolerance of the cylinder structures was assessed via pressurization tests. Impacted fabric laminates exhibited matrix crushing, fiber breakage, delamination, and fiber bundle disbonds; the latter being a unique damage mode for fabric laminates. Plate delamination and bundle disbonding was found to be more extensive around the central core area of fiber damage in the coupon specimens than in the cylinder specimens which showed a cleaner damage area due to impact. Damage resistance and damage tolerance were predicted by utilizing a five-step analysis approach previously utilized for coupon configurations. Two of the five steps were adapted to account for the effects of the structural configuration of the pressurized cylinder. The damage resistance analysis provided good correlation to the fiber damage region of both the coupon and cylinder specimens. There was little difference in the size of this region in the two specimen types. However, the analysis was not able to predict the distribution of damage through-the-thickness. This was important in assessing the damage tolerance of the cylinders. The damage tolerance analysis was able to predict the residual tensile strength of the coupons. A general methodology to predict the impact damage resistance and damage tolerance of composite structures utilizing

  20. An Evaluation of the Iosipescu Specimen for Composite Materials Shear Property Measurement. Ph.D. Thesis

    NASA Technical Reports Server (NTRS)

    Ho, Henjen

    1991-01-01

    accuracy of the shear modulus values are made, and the implications for shear strength measurement discussed. Further application of the Iosipescu shear test to woven fabric composites is presented. The limitations of the traditional strain gage instrumentation on the satin weave and high tow plain weave fabrics is discussed. Test results of a epoxy based aluminum particulate composite is also presented. A modification of the Iosipescu specimen is proposed and investigated experimentally and numerically. It is shown that the proposed new specimen design provides a more uniform shear stress field in the test section and greatly reduces the normal and shear stress concentrations in the vicinity of the notches. While the fabrication and the material cost of the proposed specimen is tremendously reduced, it is shown the accuracy of the shear modulus measurement is not sacrificed.

  1. 76 FR 18537 - Notice-Nationwide Categorical Waivers Under Section 1605 (Buy American) of the American Recovery...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-04

    ... Head Flood Light w/270 Degree Motion Sensor & Brushed Nickel Finish; Ground Fault Circuit Interrupt... Chrome Handrail Bracket; Satin Nickel Outdoor Sconce Light Fixture; Tamper-Resistant Ground Fault Circuit... Bar; Satin Nickel Finish Wall Mounted Spring Door Stop. DATES: Effective Date 4 March 2011....

  2. Self-sealing of thermal fatigue and mechanical damage in fiber-reinforced composite materials

    NASA Astrophysics Data System (ADS)

    Moll, Jericho L.

    Fiber reinforced composite tanks provide a promising method of storage for liquid oxygen and hydrogen for aerospace applications. The inherent thermal fatigue of these vessels leads to the formation of microcracks, which allow gas phase leakage across the tank walls. In this dissertation, self-healing functionality is imparted to a structural composite to effectively seal microcracks induced by both mechanical and thermal loading cycles. Two different microencapsulated healing chemistries are investigated in woven glass fiber/epoxy and uni-weave carbon fiber/epoxy composites. Self-healing of mechanically induced damage was first studied in a room temperature cured plain weave E-glass/epoxy composite with encapsulated dicyclopentadiene (DCPD) monomer and wax protected Grubbs' catalyst healing components. A controlled amount of microcracking was introduced through cyclic indentation of opposing surfaces of the composite. The resulting damage zone was proportional to the indentation load. Healing was assessed through the use of a pressure cell apparatus to detect nitrogen flow through the thickness direction of the damaged composite. Successful healing resulted in a perfect seal, with no measurable gas flow. The effect of DCPD microcapsule size (51 microm and 18 microm) and concentration (0--12.2 wt%) on the self-sealing ability was investigated. Composite specimens with 6.5 wt% 51 microm capsules sealed 67% of the time, compared to 13% for the control panels without healing components. A thermally stable, dual microcapsule healing chemistry comprised of silanol terminated poly(dimethyl siloxane) plus a crosslinking agent and a tin catalyst was employed to allow higher composite processing temperatures. The microcapsules were incorporated into a satin weave E-glass fiber/epoxy composite processed at 120°C to yield a glass transition temperature of 127°C. Self-sealing ability after mechanical damage was assessed for different microcapsule sizees (25 microm and 42

  3. Weaving interdisciplinary and discipline-specific content into palliative care education: one successful model for teaching end-of-life care.

    PubMed

    Supiano, Katherine P

    2013-01-01

    While palliative care is best delivered in an interdisciplinary format, courses teaching the interdisciplinary approach to palliative care are rare in healthcare education. This article describes a graduate-level course in palliative care for students in nursing, pharmacy, social work, and gerontology taught by faculty from each discipline. The overarching goals of this course are to convey core palliative care knowledge across disciplines, articulate the essential contribution of each discipline in collaborative care, and to define interdisciplinary processes learners need to understand and navigate interdisciplinary palliative care. Learning outcomes included increased knowledge in palliative care, enhanced attitudes in practice and application of skills to clinical practice settings, increased ability to contribute discipline-specific knowledge to their teams' discussions, and a sense of increasing confidence in participating in the care of complex patients, communicating with families, and contributing to the team as a member of their own discipline. PMID:23977797

  4. Weaving a two-dimensional fishing net from titanoniobate nanosheets embedded with Fe3O4 nanocrystals for highly efficient capture and isotope labeling of phosphopeptides

    NASA Astrophysics Data System (ADS)

    Chen, Xueqin; Li, Siyuan; Zhang, Xiaoxia; Min, Qianhao; Zhu, Jun-Jie

    2015-03-01

    Qualitative and quantitative characterization of phosphopeptides by means of mass spectrometry (MS) is the main goal of MS-based phosphoproteomics, but suffers from their low abundance in the large haystack of various biological molecules. Herein, we introduce two-dimensional (2D) metal oxides to tackle this biological separation issue. A nanocomposite composed of titanoniobate nanosheets embedded with Fe3O4 nanocrystals (Fe3O4-TiNbNS) is constructed via a facile cation-exchange approach, and adopted for the capture and isotope labeling of phosphopeptides. In this nanoarchitecture, the 2D titanoniobate nanosheets offer enlarged surface area and a spacious microenvironment for capturing phosphopeptides, while the Fe3O4 nanocrystals not only incorporate a magnetic response into the composite but, more importantly, also disrupt the restacking process between the titanoniobate nanosheets and thus preserve a greater specific surface for binding phosphopeptides. Owing to the extended active surface, abundant Lewis acid sites and excellent magnetic controllability, Fe3O4-TiNbNS demonstrates superior sensitivity, selectivity and capacity over homogeneous bulk metal oxides, layered oxides, and even restacked nanosheets in phosphopeptide enrichment, and further allows in situ isotope labeling to quantify aberrantly-regulated phosphopeptides from sera of leukemia patients. This composite nanosheet greatly contributes to the MS analysis of phosphopeptides and gives inspiration in the pursuit of 2D structured materials for separation of other biological molecules of interests.Qualitative and quantitative characterization of phosphopeptides by means of mass spectrometry (MS) is the main goal of MS-based phosphoproteomics, but suffers from their low abundance in the large haystack of various biological molecules. Herein, we introduce two-dimensional (2D) metal oxides to tackle this biological separation issue. A nanocomposite composed of titanoniobate nanosheets embedded with Fe3O4 nanocrystals (Fe3O4-TiNbNS) is constructed via a facile cation-exchange approach, and adopted for the capture and isotope labeling of phosphopeptides. In this nanoarchitecture, the 2D titanoniobate nanosheets offer enlarged surface area and a spacious microenvironment for capturing phosphopeptides, while the Fe3O4 nanocrystals not only incorporate a magnetic response into the composite but, more importantly, also disrupt the restacking process between the titanoniobate nanosheets and thus preserve a greater specific surface for binding phosphopeptides. Owing to the extended active surface, abundant Lewis acid sites and excellent magnetic controllability, Fe3O4-TiNbNS demonstrates superior sensitivity, selectivity and capacity over homogeneous bulk metal oxides, layered oxides, and even restacked nanosheets in phosphopeptide enrichment, and further allows in situ isotope labeling to quantify aberrantly-regulated phosphopeptides from sera of leukemia patients. This composite nanosheet greatly contributes to the MS analysis of phosphopeptides and gives inspiration in the pursuit of 2D structured materials for separation of other biological molecules of interests. Electronic supplementary information (ESI) available: Sequence of phosphopeptides from the digests of α- and β-casein percentages of the 4 methylated products from peptide β1 at different labeling reaction times; sequence of serum phosphopeptides; XPS spectra of Nb 3d and Ti 2p in layered oxides and H+-stacked nanosheets; phosphopeptide enrichment sensitivity of bulk oxides, layered oxides and H+-stacked nanosheets; AFM image of TiNbNS; saturated adsorption isotherm for pNPP adsorbed on bulk oxides, layered oxides and H+-stacked nanosheets; XPS spectra of Fe3O4-TiNbNS nitrogen adsorption-desorption isotherms and pore size distribution curves for the Fe3O4 nanocrystals; phosphopeptide enrichment sensitivity, capacity and selectivity of the Fe3O4-TiNbNS composites; MS/MS spectra of phosphopeptides enriched from serum; linear relationship between the logarithms of peak area ratio and loading volume ratio. See DOI: 10.1039/c4nr07041k

  5. Weaving Together Space Biology and the Human Research Program: Selecting Crops and Manipulating Plant Physiology to Produce High Quality Food for ISS Astronauts

    NASA Technical Reports Server (NTRS)

    Massa, Gioia; Hummerick, Mary; Douglas, Grace; Wheeler, Raymond

    2015-01-01

    Researchers from the Human Research Program (HRP) have teamed up with plant biologists at KSC to explore the potential for plant growth and food production on the international space station (ISS) and future exploration missions. KSC Space Biology (SB) brings a history of plant and plant-microbial interaction research for station and for future bioregenerative life support systems. JSC HRP brings expertise in Advanced Food Technology (AFT), Advanced Environmental Health (AEH), and Behavioral Health and Performance (BHP). The Veggie plant growth hardware on the ISS is the platform that first drove these interactions. As we prepared for the VEG-01 validation test of Veggie, we engaged with BHP to explore questions that could be asked of the crew that would contribute both to plant and to behavioral health research. AFT, AEH and BHP stakeholders were engaged immediately after the return of the Veggie flight samples of space-grown lettuce, and this team worked with the JSC human medical offices to gain approvals for crew consumption of the lettuce on ISS. As we progressed with Veggie testing we began performing crop selection studies for Veggie that were initiated through AFT. These studies consisted of testing and down selecting leafy greens, dwarf tomatoes, and dwarf pepper crops based on characteristics of plant growth and nutritional levels evaluated at KSC, and organoleptic quality evaluated at JSCs Sensory Analysis lab. This work has led to a successful collaborative proposal to the International Life Sciences Research Announcement for a jointly funded HRP-SB investigation of the impacts of light quality and fertilizer on salad crop productivity, nutrition, and flavor in Veggie on the ISS. With this work, and potentially with other pending joint projects, we will continue the synergistic research that will advance the space biology knowledge base, help close gaps in the human research roadmap, and enable humans to venture out to Mars and beyond.

  6. Weaving a two-dimensional fishing net from titanoniobate nanosheets embedded with Fe₃O₄ nanocrystals for highly efficient capture and isotope labeling of phosphopeptides.

    PubMed

    Chen, Xueqin; Li, Siyuan; Zhang, Xiaoxia; Min, Qianhao; Zhu, Jun-Jie

    2015-03-19

    Qualitative and quantitative characterization of phosphopeptides by means of mass spectrometry (MS) is the main goal of MS-based phosphoproteomics, but suffers from their low abundance in the large haystack of various biological molecules. Herein, we introduce two-dimensional (2D) metal oxides to tackle this biological separation issue. A nanocomposite composed of titanoniobate nanosheets embedded with Fe₃O₄ nanocrystals (Fe₃O₄-TiNbNS) is constructed via a facile cation-exchange approach, and adopted for the capture and isotope labeling of phosphopeptides. In this nanoarchitecture, the 2D titanoniobate nanosheets offer enlarged surface area and a spacious microenvironment for capturing phosphopeptides, while the Fe₃O₄ nanocrystals not only incorporate a magnetic response into the composite but, more importantly, also disrupt the restacking process between the titanoniobate nanosheets and thus preserve a greater specific surface for binding phosphopeptides. Owing to the extended active surface, abundant Lewis acid sites and excellent magnetic controllability, Fe₃O₄-TiNbNS demonstrates superior sensitivity, selectivity and capacity over homogeneous bulk metal oxides, layered oxides, and even restacked nanosheets in phosphopeptide enrichment, and further allows in situ isotope labeling to quantify aberrantly-regulated phosphopeptides from sera of leukemia patients. This composite nanosheet greatly contributes to the MS analysis of phosphopeptides and gives inspiration in the pursuit of 2D structured materials for separation of other biological molecules of interests. PMID:25757497

  7. Flexible Weaving: Investigating the Teaching and Learning Opportunities in the Practices of Theatre-Makers and Performers from Selected Townships in Cape Town

    ERIC Educational Resources Information Center

    Morris, Gay

    2013-01-01

    In 2005-2009, the author researched the theatre-making practices of young people in selected black townships near Cape Town, South Africa. Township theatre groups comprised secondary school learners and out-of-school youth who join together to learn about and make theatre, perform and watch each other. These theatre practitioners do not describe…

  8. The Role of Data Centres in the Era of Electronic Publishing|How CDS weaves links towards astronomical databases and archives

    NASA Astrophysics Data System (ADS)

    Egret, Daniel; Genova, Francoise

    1997-01-01

    The astronomy data centres, and in particular the Centre de Données astronomiques de Strasbourg (CDS), have been building electronic information services for many years. References of publications, observational data related to objects, data tables, nomenclature, have been homogenized and organized into information retrieval systems. This undertaking implied an effort of collaboration between data centres, data providers, agencies, journal editors, etc. Evolution in recent years has brought the data centres closer from the publishing process. General standards for electronic tables, tabular data, and catalogues have been proposed and implemented. With the emergence of fully electronic publication, new digital library services are being organized, and pave the way to innovative new services, linking publications to information from other sources, and making use of new methods for textual information retrieval. The data centres expect to play a key rôle in these new developments, taking advantage of their expertise in the development of value-added services, and of their long-term involvement towards a fully linked astronomy information system.

  9. [Regulation of lipid metabolism in blood of weaving shop workers (noise level of about 90 dB A) by alpha-tocopherol acetate].

    PubMed

    Melkonian, M M

    1993-01-01

    alpha-Tocopherol acetate, used for repeated treatment within a year of weavers working under highly uncomfortable conditions (the level of noise up to 90 dB), was shown to exhibit the regulating effect on the rate of lipid peroxidation and on content of alpha-tocopherol and cholesterol in blood plasma and erythrocyte membranes as well as on the ratios alpha-tocopherol acetate/total lipids, alpha-tocopherol acetate/cholesterol in blood plasma and cholesterol/alpha-tocopherol acetate in erythrocyte membranes. The vitamin decreased distinctly the atherogenicity coefficient; these data suggest that treatment with tocopherol is essential for prophylaxis of noise-produced impairments.

  10. Foxfire 2: Ghost Stories, Spring Wild Plant Foods, Spinning and Weaving, Midwifing, Burial Customs, Corn Shuckin's, Wagon Making and More Affairs of Plain Living.

    ERIC Educational Resources Information Center

    Wigginton, Eliot, Ed.

    Information about the rural Appalachian culture as told by longtime residents of Rabun Gap County, Georgia, is presented in this book. In many cases the material is in the words of the resident and additional commentary is provided by the high school student conducting the interview. Instructions are given for making items often made at home when…

  11. Weaving a two-dimensional fishing net from titanoniobate nanosheets embedded with Fe3O4 nanocrystals for highly efficient capture and isotope labeling of phosphopeptides

    NASA Astrophysics Data System (ADS)

    Chen, Xueqin; Li, Siyuan; Zhang, Xiaoxia; Min, Qianhao; Zhu, Jun-Jie

    2015-03-01

    Qualitative and quantitative characterization of phosphopeptides by means of mass spectrometry (MS) is the main goal of MS-based phosphoproteomics, but suffers from their low abundance in the large haystack of various biological molecules. Herein, we introduce two-dimensional (2D) metal oxides to tackle this biological separation issue. A nanocomposite composed of titanoniobate nanosheets embedded with Fe3O4 nanocrystals (Fe3O4-TiNbNS) is constructed via a facile cation-exchange approach, and adopted for the capture and isotope labeling of phosphopeptides. In this nanoarchitecture, the 2D titanoniobate nanosheets offer enlarged surface area and a spacious microenvironment for capturing phosphopeptides, while the Fe3O4 nanocrystals not only incorporate a magnetic response into the composite but, more importantly, also disrupt the restacking process between the titanoniobate nanosheets and thus preserve a greater specific surface for binding phosphopeptides. Owing to the extended active surface, abundant Lewis acid sites and excellent magnetic controllability, Fe3O4-TiNbNS demonstrates superior sensitivity, selectivity and capacity over homogeneous bulk metal oxides, layered oxides, and even restacked nanosheets in phosphopeptide enrichment, and further allows in situ isotope labeling to quantify aberrantly-regulated phosphopeptides from sera of leukemia patients. This composite nanosheet greatly contributes to the MS analysis of phosphopeptides and gives inspiration in the pursuit of 2D structured materials for separation of other biological molecules of interests.Qualitative and quantitative characterization of phosphopeptides by means of mass spectrometry (MS) is the main goal of MS-based phosphoproteomics, but suffers from their low abundance in the large haystack of various biological molecules. Herein, we introduce two-dimensional (2D) metal oxides to tackle this biological separation issue. A nanocomposite composed of titanoniobate nanosheets embedded with Fe3O4 nanocrystals (Fe3O4-TiNbNS) is constructed via a facile cation-exchange approach, and adopted for the capture and isotope labeling of phosphopeptides. In this nanoarchitecture, the 2D titanoniobate nanosheets offer enlarged surface area and a spacious microenvironment for capturing phosphopeptides, while the Fe3O4 nanocrystals not only incorporate a magnetic response into the composite but, more importantly, also disrupt the restacking process between the titanoniobate nanosheets and thus preserve a greater specific surface for binding phosphopeptides. Owing to the extended active surface, abundant Lewis acid sites and excellent magnetic controllability, Fe3O4-TiNbNS demonstrates superior sensitivity, selectivity and capacity over homogeneous bulk metal oxides, layered oxides, and even restacked nanosheets in phosphopeptide enrichment, and further allows in situ isotope labeling to quantify aberrantly-regulated phosphopeptides from sera of leukemia patients. This composite nanosheet greatly contributes to the MS analysis of phosphopeptides and gives inspiration in the pursuit of 2D structured materials for separation of other biological molecules of interests. Electronic supplementary information (ESI) available: Sequence of phosphopeptides from the digests of α- and β-casein percentages of the 4 methylated products from peptide β1 at different labeling reaction times; sequence of serum phosphopeptides; XPS spectra of Nb 3d and Ti 2p in layered oxides and H+-stacked nanosheets; phosphopeptide enrichment sensitivity of bulk oxides, layered oxides and H+-stacked nanosheets; AFM image of TiNbNS; saturated adsorption isotherm for pNPP adsorbed on bulk oxides, layered oxides and H+-stacked nanosheets; XPS spectra of Fe3O4-TiNbNS nitrogen adsorption-desorption isotherms and pore size distribution curves for the Fe3O4 nanocrystals; phosphopeptide enrichment sensitivity, capacity and selectivity of the Fe3O4-TiNbNS composites; MS/MS spectra of phosphopeptides enriched from serum; linear relationship between the logarithms of peak area ratio and loading volume rat

  12. Creating a Model of Latino Peer Education: Weaving Cultural Capital into the Fabric of Academic Services in an Urban University Setting

    ERIC Educational Resources Information Center

    Rios-Ellis, Britt; Rascón, Mayra; Galvez, Gino; Inzunza-Franco, Gloria; Bellamy, Laura; Torres, Angel

    2015-01-01

    Over the last few decades, college admission rates for Latinos have increased. However, the achievement gap between Latino students and other ethnic groups remains wide. Peer mentorship programs have shared in some degree of success in promoting the academic success of diverse and underrepresented student populations. Despite the growing…

  13. Pacific Telecommunications: Weaving the Technological and Social Fabric. Proceedings of the Annual Conference of the Pacific Telecommunications Council (12th, Honolulu, Hawaii, January 14-17, 1990).

    ERIC Educational Resources Information Center

    Wedemeyer, Dan J., Ed.; Lofstrom, Mark D., Ed.

    The 1990 conference was designed to afford an opportunity to assess the dynamic developments in telecommunications during the 1980s and to gain perspectives on the ways in which telecommunications can most effectively be integrated into society during the 1990s. These proceedings contain more than 100 papers presented during sessions addressing…

  14. With All Strings Attached: Composer William C. Banfield Notes the Clash of Artistry and Commerce while Weaving Together a World of Music

    ERIC Educational Resources Information Center

    Hamilton, Kendra

    2004-01-01

    William Banfield is a composer with nine symphonies to his credit, as well as countless smaller scale works--concerti, chamber works, operas, choral and jazz works--that have been performed all over the nation. He has also performed with highly acclaimed jazz performers such as Patrice Rushen, Earl Klugh, Najee, Nelson Rangell and many others. He…

  15. On the males of the orb-weaving spiders Alpaida nigrofrenata (Simon, 1895), A. machala Levi, 1988, and A. cisneros Levi, 1988 (Araneae, Araneidae) and a new synonymy.

    PubMed

    Poeta, Maria Rita Muniz; Lise, Arno Antonio

    2015-01-01

    The araneid spider genus Alpaida O.P.-Cambridge, 1889 has, until now, 148 described species (WSC 2015). The males of A. nigrofrenata (Simon, 1895), A. machala Levi, 1988, and A. cisneros Levi, 1988 are described here for the first time. A. moka Levi, 1988, based on female specimens, is synonymized with A. xavantina Levi, 1988, based on the study of specimens of both sexes. I.L.F. de Magalhães (MACN) is thanked for reviewing an early revision of this manuscript. We also thank to M. Machado (PUCRS) for the pictures of A. moka, and M. Kolmann (University of Toronto) and A. Londoño Burbano (PUCRS) for review the English. We are grateful to G. Hormiga for helping to improve this manuscript. M.R.M. Poeta was financially supported by CAPES at PPG-Zoo, PUCRS. PMID:26623625

  16. "Ka ulana 'ana i ka piko" (In Weaving You Begin at the Center): Perspectives from a Culturally Specific Approach to Art Education

    ERIC Educational Resources Information Center

    Dewhurst, Marit; Keawe, Lia O'Neill Moanike'Ala Ah-Lan; MacDowell, Marsha; Okada-Carlson, Cherie N. K.; Wong, Annette Ku'Uipolani

    2013-01-01

    This essay examines the experiences of "lau hala" ("pandanus" leaf plaiting) weavers for the pedagogical philosophies and strategies embedded in this Hawaiian art form in an effort to broaden the ways in which we understand and practice art education in any setting. Drawing on personal experiences as "lau hala"…

  17. The Double-Weave of Self and Other: Ethnographic Acts and Autobiographical Occasions in Marilou Awiakta's "Selu: Seeking the Corn-Mother's Wisdom"

    ERIC Educational Resources Information Center

    Watkins, James H.

    2006-01-01

    In the opening pages of Marilou Awiakta's "Selu: Seeking the Corn-Mother's Wisdom," the author offers a metacommentary on her delightfully hybrid text, likening it to a "double-woven basket (Cherokee-style)." The image resonates on many levels with the author's tribal traditions and thus serves to foreshadow the text's wealth of material on…

  18. Rowing the Weaves of Community Participation: Good Practices in Early Childhood Development (ECD) Program in Rural Central Lombok, West Nusa Tenggara

    ERIC Educational Resources Information Center

    Abdillah, Ali

    2014-01-01

    This paper describes the rural community participation within the context of an integrated early childhood development program initiated by the government of Indonesia in partnership with UNICEF and AusAID in Central Lombok (2008-2010). Based on purposive interviews with relevant stakeholders, as well as an analysis of past documents,…

  19. Weaving a two-dimensional fishing net from titanoniobate nanosheets embedded with Fe₃O₄ nanocrystals for highly efficient capture and isotope labeling of phosphopeptides.

    PubMed

    Chen, Xueqin; Li, Siyuan; Zhang, Xiaoxia; Min, Qianhao; Zhu, Jun-Jie

    2015-03-19

    Qualitative and quantitative characterization of phosphopeptides by means of mass spectrometry (MS) is the main goal of MS-based phosphoproteomics, but suffers from their low abundance in the large haystack of various biological molecules. Herein, we introduce two-dimensional (2D) metal oxides to tackle this biological separation issue. A nanocomposite composed of titanoniobate nanosheets embedded with Fe₃O₄ nanocrystals (Fe₃O₄-TiNbNS) is constructed via a facile cation-exchange approach, and adopted for the capture and isotope labeling of phosphopeptides. In this nanoarchitecture, the 2D titanoniobate nanosheets offer enlarged surface area and a spacious microenvironment for capturing phosphopeptides, while the Fe₃O₄ nanocrystals not only incorporate a magnetic response into the composite but, more importantly, also disrupt the restacking process between the titanoniobate nanosheets and thus preserve a greater specific surface for binding phosphopeptides. Owing to the extended active surface, abundant Lewis acid sites and excellent magnetic controllability, Fe₃O₄-TiNbNS demonstrates superior sensitivity, selectivity and capacity over homogeneous bulk metal oxides, layered oxides, and even restacked nanosheets in phosphopeptide enrichment, and further allows in situ isotope labeling to quantify aberrantly-regulated phosphopeptides from sera of leukemia patients. This composite nanosheet greatly contributes to the MS analysis of phosphopeptides and gives inspiration in the pursuit of 2D structured materials for separation of other biological molecules of interests.

  20. The Calling Canvas, Weaving Together Words and Images: A Narrative Inquiry into the Creative Voice of Students with Autism Participating in a Creative Lunchtime Program

    ERIC Educational Resources Information Center

    Kotowski, Kelly

    2013-01-01

    This narrative chronicles the story of the Lunch Bunch, a group of 4 students with autism, 1 student with a specific learning disability and their art educator/researcher as they ate lunch together and discussed creativity and at times made art. A chronological story of the Lunch Bunch was crafted utilizing narrative inquiry as the overarching…

  1. Mechanical Properties of T650-35/AFR-PE-4 at Elevated Temperatures for Lightweight Aeroshell Designs

    NASA Technical Reports Server (NTRS)

    Whitley, Karen S.; Collins, TImothy J.

    2006-01-01

    Considerable efforts have been underway to develop multidisciplinary technologies for aeroshell structures that will significantly increase the allowable working temperature for the aeroshell components, and enable the system to operate at higher temperatures while sustaining performance and durability. As part of these efforts, high temperature polymer matrix composites and fabrication technologies are being developed for the primary load bearing structure (heat shield) of the spacecraft. New high-temperature resins and composite material manufacturing techniques are available that have the potential to significantly improve current aeroshell design. In order to qualify a polymer matrix composite (PMC) material as a candidate aeroshell structural material, its performance must be evaluated under realistic environments. Thus, verification testing of lightweight PMC's at aeroshell entry temperatures is needed to ensure that they will perform successfully in high-temperature environments. Towards this end, a test program was developed to characterize the mechanical properties of two candidate material systems, T650-35/AFR-PE-4 and T650-35/RP46. The two candidate high-temperature polyimide resins, AFR-PE-4 and RP46, were developed at the Air Force Research Laboratory and NASA Langley Research Center, respectively. This paper presents experimental methods, strength, and stiffness data of the T650-35/AFR-PE-4 material as a function of elevated temperatures. The properties determined during the research test program herein, included tensile strength, tensile stiffness, Poisson s ratio, compressive strength, compressive stiffness, shear modulus, and shear strength. Unidirectional laminates, a cross-ply laminate and two eight-harness satin (8HS)-weave laminates (4-ply and 10-ply) were tested according to ASTM standard methods at room and elevated temperatures (23, 316, and 343 C). All of the relevant test methods and data reduction schemes are outlined along with

  2. A School of Our Own: Where the Children Live.

    ERIC Educational Resources Information Center

    Reynolds, Karen

    This dissertation is a story of schooling. It weaves a vision of schooling into several versions and at least three "places" where schooling can happen--up to 2020 A.D. and beyond. The stories are built on the weaving metaphor and a profound sense of place. This paper presents one individual's experiences that are weaved into and through a…

  3. Accessing the Global Network: Weaving Technology and Trade in the Pacific. Proceedings of the Annual Conference of the Pacific Telecommunications Council (13th, Honolulu, Hawaii, January 13-16, 1991).

    ERIC Educational Resources Information Center

    Wedemeyer, Dan J., Ed.; Lofstrom, Mark D., Ed.

    The 1991 conference focused on a broad range of issues and impacts and was designed to promote discussion on the ways in which telecommunications are currently used in Pacific rim business and industry. These proceedings contain more than 150 papers presented during sessions addressing the following topics: major issues in world communication, a…

  4. Weaving a Bridge of Sense: Students' Narrative Constructions as a Lens for Understanding Students' Coping with the Gap between Expectancies and Experiences When Entering Higher Education

    ERIC Educational Resources Information Center

    Ulriksen, Lars; Holmegaard, Henriette Tolstrup; Moller, Lene

    2013-01-01

    This article shows how the application of narrative methodology brings new insights into understanding students' choices and their experiences upon entering a higher education programme. The point of departure is a study of a cohort of 38 students followed over a three-year period from when they were about to finish upper-secondary school in…

  5. 16 CFR 1632.6 - Ticking substitution procedure.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... application, fiber content, and weight per unit area. With respect to film-coated ticking, a mattress ticking... backing fabric construction, weave, finish, fiber content, and weight. (2) Mattress pad ticking prototype..., weave pattern design, finish application, fiber content, and weight per unit area. With respect to...

  6. SRB thermal curtain design support

    NASA Technical Reports Server (NTRS)

    Dixon, Carl A.; Lundblad, Wayne E.; Koenig, John R.

    1992-01-01

    Improvements in SRB Thermal Curtain were identified by thermal design featuring: selection of materials capable of thermal protection and service temperatures by tri-layering quartz, S2 glass, and Kevlar in thinner cross section; weaving in single piece (instead of 24 sections) to achieve improved strength; and weaving to reduce manufacturing cost with angle interlock construction.

  7. An Absorbing Look at Terry-Cloth Towels

    ERIC Educational Resources Information Center

    Moyer, Richard; Everett, Susan

    2010-01-01

    This article describes a lesson where students explore the absorbency of several towels with different weaves and weights. The lesson follows the 5E learning-cycle model and incorporates engineering in the sense of product testing with a focus on the relationship between the weave of a towel and its absorbency. The National Science Education…

  8. 77 FR 58525 - Notice of Solicitation of Applications for Allocation of Tariff Rate Quotas on the Import of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-21

    ... on the Import of Certain Worsted Wool Fabrics to Persons Who Weave Such Fabrics in the United States... wool fabric to persons who weave such fabrics in the United States. SUMMARY: The Department hereby... worsted wool fabrics in the United States for an allocation of the 2013 tariff rate quotas on...

  9. 75 FR 54599 - Notice of Solicitation of Applications for Allocation of Tariff Rate Quotas on the Import of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-08

    ... on the Import of Certain Worsted Wool Fabrics to Persons Who Weave Such Fabrics in the United States... wool fabric to persons who weave such fabrics in the United States. SUMMARY: The Department hereby... worsted wool fabrics in the United States for an allocation of the 2011 tariff rate quotas on...

  10. Meanings Ascribed to Four Craft Activities before and after Extensive Learning.

    ERIC Educational Resources Information Center

    Katz, Noomi; Cohen, Esther

    1991-01-01

    A study to compare the meanings ascribed by 35 occupational therapy students to puppetry, woodworking, weaving, and ceramics revealed significant differences before and after learning, especially for puppetry. Significant differences were found across activities, mainly between weaving and the other crafts. (JOW)

  11. Composites from powder coated towpreg - Studies with variable tow sizes

    NASA Technical Reports Server (NTRS)

    Hugh, Maylene K.; Marchello, Joseph M.; Baucom, Robert M.; Johnston, Norman J.

    1992-01-01

    Part fabrication from composite materials usually costs less when larger fiber tow bundles are used. On the other hand, mechanical properties generally are lower for composites made using larger size tows. This situation gives rise to a choice between costs and properties in determining the best fiber tow bundle size to employ in preparing prepreg materials for part fabrication. To address this issue, unidirectional and eight harness satin fabric composite specimens were fabricated from 3k, 6k, and 12k carbon fiber reinforced LARC-TPI powder coated towpreg. Short beam shear strengths and longitudinal and transverse flexure properties were obtained for the unidirectional specimens. Tension properties were obtained for the eight harness satin woven towpreg specimens. Knowledge of the variation of properties with tow size may serve as a guide in material selection for part fabrication.

  12. Composites from powder coated towpreg - Studies with variable tow sizes

    NASA Astrophysics Data System (ADS)

    Hugh, Maylene K.; Marchello, Joseph M.; Baucom, Robert M.; Johnston, Norman J.

    Part fabrication from composite materials usually costs less when larger fiber tow bundles are used. On the other hand, mechanical properties generally are lower for composites made using larger size tows. This situation gives rise to a choice between costs and properties in determining the best fiber tow bundle size to employ in preparing prepreg materials for part fabrication. To address this issue, unidirectional and eight harness satin fabric composite specimens were fabricated from 3k, 6k, and 12k carbon fiber reinforced LARC-TPI powder coated towpreg. Short beam shear strengths and longitudinal and transverse flexure properties were obtained for the unidirectional specimens. Tension properties were obtained for the eight harness satin woven towpreg specimens. Knowledge of the variation of properties with tow size may serve as a guide in material selection for part fabrication.

  13. Evaluation of the impact response of textile composites

    NASA Technical Reports Server (NTRS)

    Portanova, M. A.

    1995-01-01

    An evaluation of the impact damage resistance and impact damage tolerance of stitched and unstitched uniweaves, 2-D braids, and 3-D weaves was conducted. Uniweave laminates were tested at four thicknesses to determine the sensitivity of the tests to this parameter. Several braid and weave parameters were also varied to establish their velocity (large mass) impacts and then loaded in tension or compression to measure residual strength. Experimental results indicate that stitching significantly improves the uniweaves' damage resistance. The 2-D braids and 3-D weaves offered less damage resistance than the stitched materials. Stitching also improved the compression after impact (CAI) and tension after impact (TAI) strengths of the uniweave materials.

  14. Tailorable advanced blanket insulation using aluminoborosilicate and alumina batting

    NASA Technical Reports Server (NTRS)

    Calamito, Dominic P.

    1989-01-01

    Two types of Tailorable Advanced Blanket Insulation (TABI) flat panels for Advanced Space Transportation Systems were produced. Both types consisted of integrally woven, 3-D fluted core having parallel faces and connecting ribs of Nicalon yarns. The triangular cross section flutes of one type was filled with mandrels of processed Ultrafiber (aluminoborosilicate) stitchbonded Nextel 440 fibrous felt, and the second type wall filled with Saffil alumina fibrous felt insulation. Weaving problems were minimal. Insertion of the fragile insulation mandrels into the fabric flutes was improved by using a special insertion tool. An attempt was made to weave fluted core fabrics from Nextel 440 yarns but was unsuccessful because of the yarn's fragility. A small sample was eventually produced by an unorthodox weaving process and then filled with Saffil insulation. The procedures for setting up and weaving the fabrics and preparing and inserting insulation mandrels are discussed. Characterizations of the panels produced are also presented.

  15. 10 CFR Appendix D to Subpart B of... - Uniform Test Method for Measuring the Energy Consumption of Clothes Dryers

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... conservation standards for clothes dryers at 10 CFR 430.32(h) are amended to require mandatory compliance using... granite weave, which is a blended fabric of 50 percent cotton and 50 percent polyester and weighs...

  16. 10 CFR Appendix D1 to Subpart B of... - Uniform Test Method for Measuring the Energy Consumption of Clothes Dryers

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... standards for clothes dryers at 10 CFR 430.32(h) is required, at which time manufacturers must use appendix... bleached cloth, made with a momie or granite weave, which is a blended fabric of 50-percent cotton and...

  17. "The World in a Drop of Water": The Feminist Vision of Patricia Howell.

    ERIC Educational Resources Information Center

    Holmlund, Chris

    1993-01-01

    Discusses two films ("Dos veces mujer" and "Intima raiz") of Patricia Howell. Demonstrates how thoroughly the feminist themes Howell's films weave together around motherhood are inflected by the specific Latin American and Costa Rican contexts in which she works. (RS)

  18. Preparing Students for the 21st Century through the Study of World Music

    ERIC Educational Resources Information Center

    Beegle, Amy Christine

    2014-01-01

    This column provides examples of activities that general music teachers might use to weave global awareness into web-based lessons to promote the development of information literacy, media literacy, and communication literacy through the study of world music.

  19. NASA Ames Develops Woven Thermal Protection System (TPS)

    NASA Video Gallery

    The Woven Thermal Protection System (WTPS) project explores an innovative way to design, develop and manufacture a family of ablative TPS materials using weaving technology and testing them in the ...

  20. Vocational Education Processes of Yoruba Women in West Africa.

    ERIC Educational Resources Information Center

    Bawubya, Maria

    1988-01-01

    Describes traditional training methods for the occupations of Yoruba women of West Africa, such as weaving, dyeing, and pottery-making. Suggests that these vocational training methodologies could be applied to contemporary African economic problems. (SK)

  1. Uncommon Teaching in an Unexpected Place

    ERIC Educational Resources Information Center

    Shore, Rebecca

    2014-01-01

    Continued physical well-being is important, especially within the aging teacher ranks. The story of one veteran exercise instructor emphasizes fitness and weaves best classroom practices throughout the narrative.

  2. The Implicit Social Scientist and the Implicit Rhetorician: An Integrative Framework for the Introductory Interpersonal Course.

    ERIC Educational Resources Information Center

    Rowan, Katherine E.

    1984-01-01

    Describes a course that uses the "people are implicit social scientists and rhetoricians" metaphor to weave together topics now standard for interpersonal texts: perception, language, self-concept, nonverbal communication, conflict, etc. (PD)

  3. Woven Thermal Protection System (Woven TPS) for Extreme Entry Environments

    NASA Video Gallery

    The Woven Thermal Protection System (WTPS) project explores an innovative way to design, develop and manufacture a family of ablative TPS materials using weaving technology and testing them in the ...

  4. Developing Academic Language: Got Words?

    ERIC Educational Resources Information Center

    Flynt, E. Sutton; Brozo, William G.

    2008-01-01

    Concerns about how to build academic vocabulary and weave its instruction into curricula are common among classroom teachers. The column includes a review of the research and some practical suggestions for teachers.

  5. Learning Math: Exploring Relationships through Superheroes.

    ERIC Educational Resources Information Center

    Clyde, Jean Anne; Mills, Heidi

    1993-01-01

    Illustrates one seven-year-old boy's understanding of mathematical relationships through drawings of his favorite "superheroes." Also illustrates how he conveyed the qualities of his heroes by weaving together the three symbol systems of language, art, and mathematics. (BB)

  6. 25 CFR 170.121 - What is a cultural access road?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... example: (1) Sacred and medicinal sites; (2) Gathering medicines or materials such as grasses for basket weaving; or (3) Other traditional activities, including, but not limited to, subsistence hunting,...

  7. 25 CFR 170.121 - What is a cultural access road?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... example: (1) Sacred and medicinal sites; (2) Gathering medicines or materials such as grasses for basket weaving; or (3) Other traditional activities, including, but not limited to, subsistence hunting,...

  8. 25 CFR 170.121 - What is a cultural access road?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... example: (1) Sacred and medicinal sites; (2) Gathering medicines or materials such as grasses for basket weaving; or (3) Other traditional activities, including, but not limited to, subsistence hunting,...

  9. 25 CFR 170.121 - What is a cultural access road?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... example: (1) Sacred and medicinal sites; (2) Gathering medicines or materials such as grasses for basket weaving; or (3) Other traditional activities, including, but not limited to, subsistence hunting,...

  10. 25 CFR 170.121 - What is a cultural access road?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... example: (1) Sacred and medicinal sites; (2) Gathering medicines or materials such as grasses for basket weaving; or (3) Other traditional activities, including, but not limited to, subsistence hunting,...

  11. Chaos Theory: Self-Organization and Symbolic Representation in Family Systems.

    ERIC Educational Resources Information Center

    Butz, Michael R.; Carlson, J. Matthew; Carlson, Jon

    1998-01-01

    Proposes an integration of the use of symbols and metaphors that illustrates nonlinear dynamics through a case example weaving together contemporary science and human development in the context of family therapy. Discusses areas of future study. (Author/MKA)

  12. 15 CFR Supplement No. 2 to Part 740 - Items That May Be Donated To Meet Basic Human Needs Under the Humanitarian License Exception

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... Supplies and Equipment Medical Supplies and Devices Medicine-Processing Equipment Medicines Vitamins Water... Hygiene Items Soap-Making Equipment Weaving and Sewing Equipment (d) Shelter Building Materials Hand...

  13. 15 CFR Supplement No. 2 to Part 740 - Items That May Be Donated To Meet Basic Human Needs Under the Humanitarian License Exception

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... Supplies and Equipment Medical Supplies and Devices Medicine-Processing Equipment Medicines Vitamins Water... Hygiene Items Soap-Making Equipment Weaving and Sewing Equipment (d) Shelter Building Materials Hand...

  14. 15 CFR Supplement No. 2 to Part 740 - Items That May Be Donated To Meet Basic Human Needs Under the Humanitarian License Exception

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... Supplies and Equipment Medical Supplies and Devices Medicine-Processing Equipment Medicines Vitamins Water... Hygiene Items Soap-Making Equipment Weaving and Sewing Equipment (d) Shelter Building Materials Hand...

  15. 15 CFR Supplement No. 2 to Part 740 - Items That May Be Donated To Meet Basic Human Needs Under the Humanitarian License Exception

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... Supplies and Equipment Medical Supplies and Devices Medicine-Processing Equipment Medicines Vitamins Water... Hygiene Items Soap-Making Equipment Weaving and Sewing Equipment (d) Shelter Building Materials Hand...

  16. Same Play, Different Actors: The Aquatic Community.

    ERIC Educational Resources Information Center

    Kanis, Ira B.; Saccente, Joseph

    1988-01-01

    Provided are background information, equipment lists, and procedures for four activities for teaching aquatic ecology. Activities include "The Aquatic Food Chain Game"; "Two-Liter Aqua-Vivariums"; "A Sealed World"; and "Weaving a Web: Evaluation." (CW)

  17. Ideas Worth Borrowing. Life Studies: Montana Students Tell the Story of a Place and Its People; Tales of Triumph: Fairy Tales Weave Connections between Generations; Everybody Writes: English Language Learners Discover Their Voice; Traveling by Post: "Paper Exchange Students" Explore the Globe; Learning by the Book: Students Publish a Series of Local Bestsellers; The Roots of Nikiski: Alaskan Students Discover Their Heritage and Leave a Legacy of Their Own; Riding "La Alfombra Magica": ESL Students Explore Their Roots....

    ERIC Educational Resources Information Center

    Boss, Suzie; Sherman, Lee; Linik, Joyce Riha; Reed, Bracken

    2002-01-01

    Seven classroom projects that motivate student writing in Northwest schools are described. The projects vary in grade level. Themes include local history, fairy tales, "Flat Stanley" exchange students, student book publishing, art, poetry, and science. Common practices include having students write about local and personally meaningful topics,…

  18. Visualisation of fingermarks and grab impressions on dark fabrics using silver vacuum metal deposition.

    PubMed

    Knighting, Susan; Fraser, Joanna; Sturrock, Keith; Deacon, Paul; Bleay, Stephen; Bremner, David H

    2013-09-01

    Vacuum metal deposition (VMD) involves the thermal evaporation of metal (silver) in a vacuum, resulting in a uniform layer being deposited on the specimen being treated. This paper examines the use of silver on dark fabrics, thus offering a simpler operation and more obvious colouration to that of the traditional use of gold and zinc metals which must be evaporated separately. The aim of this study was to investigate the effect of fabric type, donor, mark age and method of fingermark deposition on the quality of marks visualised using silver VMD. This was achieved by collecting fingermark deposits from fifteen donors, of both sexes and various ages, by a grab or a press method. Four different fabrics: satin, polyester, polycotton and cotton were studied over a 10day timeline of 1, 2, 3, 4, 5, 6, 7, 14, 21 and 28+ days. It was found that satin and polyester gave the most positive results, with polyester often producing excellent ridge detail. Cotton and polycotton were less successful with no ridge detail being observed. The donors also had an observable effect on the results obtained probably due to variations in secretions produced or pressures applied during specimen collection. The age of the mark or the method of mark deposition had little influence on the results obtained. Silver VMD is a viable process for visualising marks on certain dark fabrics and has the advantage over gold/zinc VMD in that the marks visualised are light in colour which contrasts well against the dark background.

  19. Natural dyes versus lysochrome dyes in cheiloscopy: A comparative evaluation

    PubMed Central

    Singh, Narendra Nath; Brave, V R; Khanna, Shally

    2010-01-01

    Cheiloscopy is the study of lip prints. Lip prints are genotypically determined and are unique, and stable. At the site of crime, lip prints can be either visible or latent. To develop lip prints for study purpose various chemicals such as lysochrome dyes, fluorescent dyes, etc. are available which are very expensive. Vermilion (Sindoor used by married Indian women) and indigo dye (fabric whitener) are readily available, naturally derived, and cost-effective reagents available in India. Objective: To compare the efficacy of sudan black, vermilion, and indigo in developing visible and latent lip prints made on bone china cup, satin fabric, and cotton fabric. Materials and Methods: Out of 45 Volunteers 15 lip prints were made on bone China cup 15 lip prints on Satin fabric and 15 on Cotton fabric. Sudan black, vermilion and indigo were applied on visible and latent lip prints and graded as good (+,+), fair (+), and poor (-) and statistically evaluated. Results: The vermilion and indigo dye gives comparable results to that of sudan black for developing visible and latent lip prints. PMID:21189984

  20. Satiety Innovations: Food Products to Assist Consumers with Weight Loss, Evidence on the Role of Satiety in Healthy Eating: Overview and In Vitro Approximation.

    PubMed

    López-Nicolás, Rubén; Marzorati, Massimo; Scarabottolo, Lia; Halford, Jason C G; Johnstone, Alexandra M; Frontela-Saseta, Carmen; Sanmartín, Angel M; Ros-Berruezo, Gaspar; Harrold, Joanne A

    2016-03-01

    The prevalence of overweight and obesity is increasing globally, driven by the availability of energy-dense palatable foods. Most dietary strategies fail because of hunger generated by calorie restriction, and interventions that specifically control hunger and/or promote fullness may aid success. Current consumers have a limited choice of satiety-enhancing products with proven health benefits, and innovative ways to produce new foods (as structural modification) to enhance satiety/satiation may provide new opportunities. However, this potential is hindered by the cost of product testing. Within the SATIN-SATiety INnovation project-an in vitro platform has been developed to offer a cost-effective means of assessing the potential satiation/satiety effect of novel foods. This combines in vitro technologies to assess changes in colonic bacteria metabolism, appetite hormone release and the stability and bioavailability of active compounds in the new products/ingredients. This article provides a brief review of nutrients for which an impact on short-term appetite regulation has been demonstrated, and a summary of the changes to food structure which can be used to produce a change in appetite expression. Furthermore, the SATIN in vitro platform is discussed as a means of assessing the impact of nutritional and structural manipulations on appetite. PMID:26847622

  1. Satiety Innovations: Food Products to Assist Consumers with Weight Loss, Evidence on the Role of Satiety in Healthy Eating: Overview and In Vitro Approximation.

    PubMed

    López-Nicolás, Rubén; Marzorati, Massimo; Scarabottolo, Lia; Halford, Jason C G; Johnstone, Alexandra M; Frontela-Saseta, Carmen; Sanmartín, Angel M; Ros-Berruezo, Gaspar; Harrold, Joanne A

    2016-03-01

    The prevalence of overweight and obesity is increasing globally, driven by the availability of energy-dense palatable foods. Most dietary strategies fail because of hunger generated by calorie restriction, and interventions that specifically control hunger and/or promote fullness may aid success. Current consumers have a limited choice of satiety-enhancing products with proven health benefits, and innovative ways to produce new foods (as structural modification) to enhance satiety/satiation may provide new opportunities. However, this potential is hindered by the cost of product testing. Within the SATIN-SATiety INnovation project-an in vitro platform has been developed to offer a cost-effective means of assessing the potential satiation/satiety effect of novel foods. This combines in vitro technologies to assess changes in colonic bacteria metabolism, appetite hormone release and the stability and bioavailability of active compounds in the new products/ingredients. This article provides a brief review of nutrients for which an impact on short-term appetite regulation has been demonstrated, and a summary of the changes to food structure which can be used to produce a change in appetite expression. Furthermore, the SATIN in vitro platform is discussed as a means of assessing the impact of nutritional and structural manipulations on appetite.

  2. Modeling yarn slip in woven fabric at the continuum level: Simulations of ballistic impact

    NASA Astrophysics Data System (ADS)

    Parsons, Ethan M.; King, Michael J.; Socrate, Simona

    2013-01-01

    Woven fabric is used in a wide variety of military and commercial products—both in neat form and as the reinforcement phase of composites. In many applications, yarn slip, the relative sliding of the yarns composing the weave, is an important mode of deformation or failure. Yarn slip can significantly change the energy absorption capacity and yarn density of the fabric and also cause yarns to unravel from the weave. Virtually all existing models for woven fabric that allow yarn slip are discrete in nature. They simulate every yarn in the weave and are therefore computationally expensive and difficult to integrate with other material models. A promising alternative to discrete models is the mesostructure-based continuum technique. With this technique, homogenized continuum properties are determined from a deforming analytic model of the fabric mesostructure at each material point. Yarn-level mechanisms of deformation are thus captured without the computational cost of simulating every yarn in the fabric. However, existing mesostructure-based continuum models treat the yarns as pinned together at the cross-over points of the weave, and an operative model that allows yarn slip has not been published. Here, we introduce a mesostructure-based continuum model that permits yarn slip and use the model to simulate the ballistic impact of woven fabric. In our approach, the weave is the continuum substrate on which the model is anchored, and slip of the yarns occurs relative to the weave continuum. The cross-over points of the weave act as the material points of the continuum, and the evolution of the local weave mesostructure at each point of the continuum is represented by state variables. At the same time, slip velocity fields simulate the slip of each yarn family relative to the weave continuum and therefore control the evolution of the yarn pitch. We found that simulating yarn slip significantly improves finite element predictions of the ballistic impact of a Kevlar

  3. A sustainable slashing industry using biodegradable sizes from modified soy protein to replace petro-based poly(vinyl alcohol).

    PubMed

    Zhao, Yi; Zhao, Yuzhu; Xu, Helan; Yang, Yiqi

    2015-02-17

    Biodegradable sizing agents from triethanolamine (TEA) modified soy protein could substitute poly(vinyl alcohol)(PVA) sizes for high-speed weaving of polyester and polyester/cotton yarns to substantially decrease environmental pollution and impel sustainability of textile industry. Nonbiodegradable PVA sizes are widely used and mainly contribute to high chemical oxygen demand (COD) in textile effluents. It has not been possible to effectively degrade, reuse or replace PVA sizes so far. Soy protein with good biodegradability showed potential as warp sizes in our previous studies. However, soy protein sizes lacked film flexibility and adhesion for required high-speed weaving. Additives with multiple hydroxyl groups, nonlinear molecule, and electric charge could physically modify secondary structure of soy protein and lead to about 23.6% and 43.3% improvement in size adhesion and ability of hair coverage comparing to unmodified soy protein. Industrial weaving results showed TEA-soy protein had relative weaving efficiency 3% and 10% higher than PVA and chemically modified starch sizes on polyester/cotton fabrics, and had relative weaving efficiency similar to PVA on polyester fabrics, although with 3- 6% lower add-on. In addition, TEA-soy sizes had a BOD5/COD ratio of 0.44, much higher than 0.03 for PVA, indicating that TEA-soy sizes were easily biodegradable in activated sludge.

  4. Transport properties of ceramic composites

    SciTech Connect

    Starr, T.L.

    1995-08-01

    This project involves experimental and modeling investigation of the transport properties of chemical vapor infiltration (CVI) preforms and densified composites, with particular emphasis on gas permeability and mass diffusivity. The results of this work will be useful both for on-going CVI process development and for evaluation and optimization of composite materials for fossil energy applications. With preforms made with 500 filaments/tow Nicalon at 40 vol% fiber loading, permeability values are similar for square-weave cloth layup and 3-D weave at low density. At greater densification the 3-D weave permeability is lower and approaches zero with significantly more closed porosity than the cloth layup. For filament wound preforms we were unable to make reliable measurements with the available materials. A model for gas transport in these materials utilizes percolation theory concepts. The ultimate achievable density is related to the closing of a continuous gas path through the preform. As the density approaches this limit the gas permeability and diffusivity vanish exponentially. The value of this limit is controlled primarily by the preform fiber architecture. The observed difference between the cloth layup and 3-D weave materials is due to the larger pores at tow crossing points found in the 3-D weave.

  5. Experimental and numerical analysis of the influence of tyres' properties on the straight running stability of a sport-touring motorcycle

    NASA Astrophysics Data System (ADS)

    Cossalter, Vittore; Doria, Alberto; Formentini, Matteo; Peretto, Martino

    2012-03-01

    The behaviour of a motorcycle on the road is largely governed by tyre properties. This paper presents experimental and numerical analyses dealing with the influence of tyre properties on the stability of weave and wobble in straight running. The final goal is to find optimal sets of tyre properties that improve the stability of a motorcycle. The investigation is based on road tests carried out on a sport-touring motorcycle equipped with sensors. Three sets of tyres are tested at different speeds in the presence of weave and wobble. The analysis of telemetry data highlights significant differences in the trends of frequency and damping of weave and wobble against speed. The experimental analysis is integrated by a parametric numerical analysis. Tyre properties are varied according to the design of experiments method, in order to highlight the single effects on stability of lateral and cornering coefficient of front and rear tyres.

  6. Hemp reinforced composites: surface treatment, manufacturing method and fabric type effects

    SciTech Connect

    Cicala, G.; Cristaldi, G.; Recca, G.

    2010-06-02

    Hemp mats and weaved fabrics were used as received and after surface treatment as reinforcement for composites. Mercerization and amino silane surface treatments improved fibre/matrix adhesion and, as results, the mechanical properties of the composites were also improved. However, if surface treatment was too severe degradation of the mechanical properties of the single fibre was observed and this resulted in a reinforcing efficiency loss. Weaved fabrics obtained from twisted fibres in unidirectional and 0/90 deg. architecture were used. The use of weaved fabrics lead to high improvements of composite mechanical properties despite the absence of fibre's surface treatment. The specimens manufactured by LRTM (Light Resin Transfer Moulding) showed enhanced mechanical properties compared to specimens made by hand lay up. Mechanical models were also used to predict the mechanical properties of the composites.

  7. Thermal blanket insulation for advanced space transportation systems

    NASA Technical Reports Server (NTRS)

    Pusch, Richard H.

    1985-01-01

    The feasibility of weaving Nextel ceramic and Nicalon silicon carbide yarns into integrally woven, three dimensional fluted core fabrics was demonstrated. Parallel face fabrics joined with woven fabric ribs to form triangular cross section flutes between the faces were woven into three single and one double layer configuration. High warp yarn density in the double layer configuration caused considerable yarn breakage during weaving. The flutes of all four fabrics were filled with mandrels made from Q-Fiber Felt and FRCI-20-12 to form candidate insulation panels for advanced Space Transportation Systems. Procedures for preparing and inserting the mandrels were developed. Recommendations are made on investigating alternate methods for filling the flutes with insulation, and for improving the weaving of these types of fabrics.

  8. Polymer infiltration studies

    NASA Technical Reports Server (NTRS)

    Marchello, Joseph M.

    1991-01-01

    Progress was made on the preparation of carbon fiber composites using advanced polymer resins. Processes reported include powder towpreg process, weaving towpreg made from dry powder prepreg, composite from powder coated towpreg, and toughening of polyimide resin (PMR) composites by semi-interpenetrating networks. Several important areas of polymer infiltration into fiber bundles will be researched. Preparation to towpreg for textile preform weaving and braiding and for automated tow placement is a major goal, as are the continued development of prepregging technology and the various aspects of composite part fabrication.

  9. Woven TPS Mechanical Property Evaluation

    NASA Technical Reports Server (NTRS)

    Gonzales, Gregory Lewis; Kao, David Jan-Woei; Stackpoole, Margaret M.

    2013-01-01

    Woven Thermal Protection Systems (WTPS) is a relatively new program funded by the Office of the Chief Technologist (OCT). The WTPS approach to producing TPS architectures uses precisely engineered 3-D weaving techniques that allow tailoring material characteristics needed to meet specific mission requirements. A series of mechanical tests were performed to evaluate performance of different weave types, and get a better understanding of failure modes expected in these three-dimensional architectures. These properties will aid in material down selection and guide selection of the appropriate WTPS for a potential mission.

  10. Musculoskeletal problems in Iranian hand-woven carpet industry: guidelines for workstation design.

    PubMed

    Choobineh, Alireza; Hosseini, Mostafa; Lahmi, Mohammadali; Khani Jazani, Reza; Shahnavaz, Houshang

    2007-09-01

    Long hours of static work with awkward posture at traditionally designed looms can cause high prevalence of musculoskeletal disorders (MSDs) among carpet weavers. A comprehensive study was conducted in this industry with the objectives of determination of MSDs symptoms prevalence; identification of major factors associated with MSDs symptoms in carpet weaving occupation; and development of guidelines for weaving workstation design. In the present paper, this ergonomics study is presented. The study consisted of two phases. In the first phase, MSDs symptoms in nine Iranian provinces were surveyed by questionnaire among 1439 randomly selected weavers. Working posture and weaving workstations were ergonomically assessed as well. The results of this phase revealed that symptoms from the musculoskeletal system occurred in high rate among weavers with the prevalence significantly higher than that of the general Iranian population (P<0.001). It was found that the majority of ergonomics shortcomings originated from ill-designed weaving workstation. Based on the findings, some general guidelines for workstation design were presented. In the second phase, considering the general guidelines, an adjustable workstation was designed and constructed. To develop quantitative guidelines for optimizing workstation set-up, in the laboratory, nine sets of experimental conditions were tested, and working posture and weavers' perceptions were measured. The results of this lab work showed that working posture was acceptable for both the researchers and the weavers when the weaving height was adjusted 20 cm above the elbow height and a high seat with forward slope was used. By combining the results of the two phases, guidelines for weaving workstation design were presented. In this ergonomics-oriented workstation, loom is vertical. Seat, loom and weaving heights are adjustable. There is enough leg room under the loom. The seat with 10 degrees forward slope is adjusted 15 cm above the

  11. Manufacture of multi-layer woven preforms

    NASA Technical Reports Server (NTRS)

    Mohamed, M. H.; Zhang, Z.; Dickinson, L.

    1988-01-01

    This paper reviews current three-dimensional weaving processes and discusses a process developed at the Mars Mission Research Center of North Carolina State University to weave three-dimensional multilayer fabrics. The fabrics may vary in size and complexity from simple panels to T-section or I-section beams to large stiffened panels. Parameters such as fiber orientation, volume fraction of the fiber required in each direction, yarn spacings or density, etc., which determine the physical properties of the composites are discussed.

  12. Development of 3D Woven Ablative Thermal Protection Systems (TPS) for NASA Spacecraft

    NASA Technical Reports Server (NTRS)

    Feldman, Jay D.; Ellerby, Don; Stackpoole, Mairead; Peterson, Keith; Venkatapathy, Ethiraj

    2015-01-01

    The development of a new class of thermal protection system (TPS) materials known as 3D Woven TPS led by the Entry Systems and Technology Division of NASA Ames Research Center (ARC) will be discussed. This effort utilizes 3D weaving and resin infusion technologies to produce heat shield materials that are engineered and optimized for specific missions and requirements. A wide range of architectures and compositions have been produced and preliminarily tested to prove the viability and tailorability of the 3D weaving approach to TPS.

  13. Radio frequency and infrared drying of sized textile warp yarns

    SciTech Connect

    Ruddick, H.G. )

    1990-11-01

    Drying sized textile warp yarns without contacting the warp is easily accomplished by either radio frequency or infrared techniques. Although the process is more expensive than conventional drying, the substantial savings accrued during subsequent weaving and finishing of the cloth can help keep the US textile industry competitive and support electrical load. 5 refs., 8 figs., 14 tabs.

  14. Signal processing and analyzing works of art

    NASA Astrophysics Data System (ADS)

    Johnson, Don H.; Johnson, C. Richard, Jr.; Hendriks, Ella

    2010-08-01

    In examining paintings, art historians use a wide variety of physico-chemical methods to determine, for example, the paints, the ground (canvas primer) and any underdrawing the artist used. However, the art world has been little touched by signal processing algorithms. Our work develops algorithms to examine x-ray images of paintings, not to analyze the artist's brushstrokes but to characterize the weave of the canvas that supports the painting. The physics of radiography indicates that linear processing of the x-rays is most appropriate. Our spectral analysis algorithms have an accuracy superior to human spot-measurements and have the advantage that, through "short-space" Fourier analysis, they can be readily applied to entire x-rays. We have found that variations in the manufacturing process create a unique pattern of horizontal and vertical thread density variations in the bolts of canvas produced. In addition, we measure the thread angles, providing a way to determine the presence of cusping and to infer the location of the tacks used to stretch the canvas on a frame during the priming process. We have developed weave matching software that employs a new correlation measure to find paintings that share canvas weave characteristics. Using a corpus of over 290 paintings attributed to Vincent van Gogh, we have found several weave match cliques that we believe will refine the art historical record and provide more insight into the artist's creative processes.

  15. Self-Portrait Tapestries

    ERIC Educational Resources Information Center

    McPartlan, Amy Sue

    2008-01-01

    Inspired by an extraordinary "Textiles in the Museum" workshop at the Metropolitan Museum of Art, the author was motivated to plan an engaging fiber lesson for her Studio in Creative Crafts course. In this article, she describes how her students made self-portrait tapestries that were inspired by Coptic weavings. The multiple tasks required to…

  16. fibmeasure: Python/Cython module to find the center of back-illuminated optical fibers in metrology images

    NASA Astrophysics Data System (ADS)

    Gilbert, James

    2016-03-01

    fibmeasure finds the precise locations of the centers of back-illuminated optical fibers in images. It was developed for astronomical fiber positioning feedback via machine vision cameras and is optimized for high-magnification images where fibers appear as resolvable circles. It was originally written during the design of the WEAVE pick-and-place fiber positioner for the William Herschel Telescope.

  17. "Green" School Programs. Research Brief

    ERIC Educational Resources Information Center

    Johnston, J. Howard

    2009-01-01

    What are "Green School" programs and how do they benefit students, teachers and the community? Green School programs seek to weave concepts of sustainability and environmental awareness into the social and academic culture of the school community. Green schools are high performance facilities that have been designed, built, renovated operated or…

  18. The Goat in the Rug.

    ERIC Educational Resources Information Center

    Blood, Charles L.; Link, Martin

    Based on the activities of the real Window Rock weaver, Glenmae, and her goat, Geraldine, this illustrated story incorporates authentic details relative to the Navajo art of rug weaving and is designed for children aged four to eight. Capitalizing on the humor inherent in Geraldine's point of view, the story centers on the goat's observation of…

  19. Engagement and Citizenship: A New Core for the University

    ERIC Educational Resources Information Center

    Lewis, Dan A.

    2014-01-01

    The author proposes that "societal renewal" and the engagement required to accomplish that renewal should be the core of the university. By focusing on the basic building blocks of good citizenship (civic knowledge and civic action) the university can weave, at relatively low cost, programs and classes into its core. Using Northwestern…

  20. "We're Going to Read Poetry in This Class?"

    ERIC Educational Resources Information Center

    Frank, Thomas E.

    2005-01-01

    How can poetry be a resource for effective teaching of congregational life and leadership? Drawing on poetry from an array of sources, the author weaves a narrative to discuss specific strategies employed for using poetry in the classroom. Recognizing the capacity of poems to awaken latent imaginations and evoke new insights about church…

  1. Campus on the Hill.

    ERIC Educational Resources Information Center

    Martin, Frank Edgerton

    2002-01-01

    Details the University of Cincinnati's campus master plan, designed to overcome deans'"fiefdoms" and make the best use of the limited remaining open space. Three imperatives shaped the plan: siting new buildings to infill the campus fabric rather than taking open space, siting buildings to shape outdoor spaces, and weaving open spaces as a…

  2. Handbook of Research on Literacy and Diversity

    ERIC Educational Resources Information Center

    Morrow, Lesley Mandel, Ed.; Rueda, Robert, Ed.; Lapp, Diane, Ed.

    2009-01-01

    This is the first research handbook to address all dimensions of diversity that have an impact on literacy achievement. Leading experts examine how teaching and learning intersect with cultural and language differences and socioeconomic disparities in today's increasingly diverse schools and communities. The volume weaves compelling research…

  3. Bearing Witness: Poetry by Teachers about Teaching.

    ERIC Educational Resources Information Center

    Hatcher, Margaret, Ed.

    The purpose of this poetry anthology is to create a positive inspirational yet realistic picture of teachers and the very challenging and complex contexts within which they "weave their magic in students' lives" and make contributions to the world. The anthology aims to show how teachers think and feel about teaching, learning, and their students.…

  4. Discourses of Legitimacy: A Love Song to Our Mongrel Selves

    ERIC Educational Resources Information Center

    Filmer, Alice A.

    2009-01-01

    In an intervention that blurs methodological boundaries traditionally separating the researcher from the researched, history from poetry, and the personal from the political, the author weaves a narrative account of her Euro-American family's early history in California into a larger set of social and historical events taking place during the…

  5. Literacy Instruction for English Language Learners Pre-K-2

    ERIC Educational Resources Information Center

    Barone, Diane M.; Xu, Shelley Hong

    2007-01-01

    Summarizing current research and weaving it into practical instructional strategies that teachers can immediately use with young English language learners (ELLs), this book addresses a major priority for today's primary-grade classrooms. All aspects of effective instruction for ELLs are explored: oral language development and instruction,…

  6. Roles of Frequency, Attitudes, and Multiple Intelligence Modality Surrounding Electricity Content-Based Reader's Theatre

    ERIC Educational Resources Information Center

    Hosier, Julie Winchester

    2009-01-01

    Integration of subjects is something elementary teachers must do to insure required objectives are covered. Science-based Reader's Theatre is one way to weave reading into science. This study examined the roles of frequency, attitudes, and Multiple Intelligence modalities surrounding Electricity Content-Based Reader's Theatre. This study used…

  7. Death, Murder, and Mayhem: Stories of Violence and Healing on the Plains

    ERIC Educational Resources Information Center

    Maher, Susan Naramore

    2009-01-01

    Unexpected, dramatic stories of death have left deep marks on the physical landscape and in the cultural psyche since humans first began to weave narrative from the Plains. When scholars and writers converged in Omaha, Nebraska for the 34th Interdisciplinary Symposium of the Center for Great Plains Center, many stories received scholarly and…

  8. The hydroentanglement system of producing nonwoven fabrics of certain specific attributes and functionalities

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Although the traditional technologies and processes of producing fabric structures, via yarn spinning, weaving, knitting, lacing, tufting, or the like, continue to be the ‘major league’ players in textile manufacturing today, the modern hydroentanglement system, commonly known as “spunlacing,” has a...

  9. Transaction Circles with Digital Texts as a Foundation for Democratic Practices

    ERIC Educational Resources Information Center

    Brown, Sally

    2015-01-01

    Transaction circles weave together elements of guided reading and literature circles in an open conversational structure that supports students as agentive learners. Discourse within these circles utilizing digital informational texts assist in the development of democratic practices even in a time when federal mandates limit curricula and…

  10. When the Familiar Is Strange: Encountering the Cultural Politics of Hawaii in the College Classroom

    ERIC Educational Resources Information Center

    Tavares, Hannah M.

    2008-01-01

    Weaving feminist, psychoanalytic, and postcolonial strands of social criticism, I recount an incident that is emblematic of the complex arrangements or dispositions of space in the Pacific. The specific moment--an encounter in the college classroom where an entangled racial-ethnic-gender dynamic of identification surfaced--acts as a catalyst for…

  11. Celebrating the Earth: Stories, Experiences, and Activities.

    ERIC Educational Resources Information Center

    Livo, Norma J.

    Young learners are invited to learn about the natural world through engaging activities that encourage the observation, exploration, and appreciation of nature. Weaving together a stimulating tapestry of folktales, personal narratives, and hands-on activities, this book teaches children about the earth and all of its creatures--birds, plants,…

  12. Attitude and Passion: Becoming a Teacher in Early Childhood Education and Care

    ERIC Educational Resources Information Center

    Maier-Höfer, Claudia

    2015-01-01

    By focusing on a collective aesthetics based on sensation and affect, researchers, especially in Stockholm, Sweden, are exploring a pedagogy that opens up space for assemblages of desire, acknowledging the expressions of children who transform themselves and their milieus into a weave of bodies, spaces, signs and media. By analysing this pedagogy,…

  13. Thermal insulation blanket material

    NASA Technical Reports Server (NTRS)

    Pusch, R. H.

    1982-01-01

    A study was conducted to provide a tailorable advanced blanket insulation based on a woven design having an integrally woven core structure. A highly pure quartz yarn was selected for weaving and the cells formed were filled with a microquartz felt insulation.

  14. Cowboys Count, Monkeys Measure, and Princesses Problem Solve: Building Early Math Skills through Storybooks

    ERIC Educational Resources Information Center

    Wilburne, Jane M.; Keat, Jane B.; Napoli, Mary P.

    2011-01-01

    Nervous about teaching math to young children? Too pressed for time to teach all of the math concepts children need to know? Now there's a practical, stress-free guide to one of the most effective ways to enhance children's mathematical thinking in pre-K-Grade 3--by weaving math concepts into storytime. Ready for any educator to pick up and start…

  15. CCCC Chair's Address: Representing Ourselves, 2008

    ERIC Educational Resources Information Center

    Glenn, Cheryl

    2008-01-01

    This article presents the text of the author's address at the fifty-ninth annual convention of the Conference on College Composition and Communication (CCCC) in March 2008. In her address, the author picks up strands of previous Chairs' addresses and weaves them through the fabric of her remarks. What she hopes will give sheen to the fabric is her…

  16. Compare Fabric Materials. Grades 3-5.

    ERIC Educational Resources Information Center

    Rushton, Erik; Ryan, Emily; Swift, Charles

    In this activity, students look at different types of fabric and their respective individual properties. Using a magnifying glass and sandpaper, students test the weave and wear quality of sample fabrics. By comparing the qualities of different fabrics, they are able to better understand why there are so many different types of fabric and…

  17. Negotiating Language, Culture and Pupil Agency in Complementary School Classrooms

    ERIC Educational Resources Information Center

    Lytra, Vally

    2011-01-01

    In this paper, I examine the teaching of language and culture and in particular the use of songs as curriculum in two London Turkish complementary schools. Drawing on a series of interconnected classroom vignettes, I look at how children weave together their semiotic resources to negotiate and transform two songs and the talk and action around…

  18. Keeping Your Ear to the Ground: Top School Librarians Are Constantly Alert for Ways To Team Up with Teachers.

    ERIC Educational Resources Information Center

    Paglin, Catherine

    2003-01-01

    Research has linked strong school library programs to academic achievement. In Oregon's Tigard-Tualatin School District, one school librarian collaborates on curriculum units with teachers, weaving instruction on information literacy and research skills throughout the curriculum. In Portland (Oregon), another librarian designs ways for students to…

  19. Operant Variability: Procedures and Processes

    ERIC Educational Resources Information Center

    Machado, Armando; Tonneau, Francois

    2012-01-01

    Barba's (2012) article deftly weaves three main themes in one argument about operant variability. From general theoretical considerations on operant behavior (Catania, 1973), Barba derives methodological guidelines about response differentiation and applies them to the study of operant variability. In the process, he uncovers unnoticed features of…

  20. Higher Order Thinking in the Dance Studio

    ERIC Educational Resources Information Center

    Moffett, Ann-Thomas

    2012-01-01

    The author identifies higher order thinking as an essential component of dance training for students of all ages and abilities. Weaving together insights from interviews with experts in the field of dance education with practical pedagogical applications within an Improvisation and Composition class for talented and gifted youth, this article…

  1. Epoxy Phosphonate Crosslinkers for Providing Flame Resistance to Cotton Textiles

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Two new monomers (2-methyl-oxiranylmethyl)-phosphonic acid dimethyl ester (3) and [2-(dimethoxy-phosphorylmethyl)-oxyranylmethyl]-phosphonic acid dimethyl ester (6) were prepared and used with dicyandiamide (7) and citric acid (8) to impart flame resistance to cotton plain weave, twill, and 80:20-co...

  2. Peoples, Processes and Patterns: Islam.

    ERIC Educational Resources Information Center

    Gibbons, Joan; And Others

    Designed for use by elementary and secondary teachers but useful to anyone interested in Islamic art, this booklet considers the ways in which design issues have been solved in Islamic cultures, both in the past and the present. The text covers two major areas: aspects of pattern in Islamic weaving and aspects of Islamic tilework. Under weaving…

  3. Teaching Vocabulary in the Literature Classroom.

    ERIC Educational Resources Information Center

    Barton, James

    2001-01-01

    Advocates concept-related vocabulary instruction, in which students link individual words with larger literature concepts. Outlines four steps to creating a concept-related vocabulary lesson. Offers examples of how concept-related vocabulary lessons can be conducted while reading, before reading, and after reading. Outlines web, weave, and…

  4. Bootstraps: From an American Academic of Color.

    ERIC Educational Resources Information Center

    Villanueva, Victor, Jr.

    Presenting a look at how racism works to inhibit academic achievement by limiting academic opportunities, this personal narrative weaves stories from an individual's life with an examination of research and popular thought on language use, literacy, and intelligence among people of color. The narrative considers the personal experiences of an…

  5. Let Me Do It: Children's Art with Less Stress and More Success.

    ERIC Educational Resources Information Center

    Spears, Jo Ann Lohl

    2002-01-01

    Offers suggestions for incorporating inexpensive art activities into early childhood classrooms. Suggests activities for children over 3 years in the areas of art using: paint and food coloring, drawing or scribbling, sculpture or construction, weaving and stitching, clay and dough, paper scraps, and broken crayons. Suggests craft activities for…

  6. Using Picture Books to Support Young Children's Literacy

    ERIC Educational Resources Information Center

    Strasser, Janis; Seplocha, Holly

    2007-01-01

    This article discusses the importance of using picture books to support young children's literacy. A picture book is different from a children's book, because it contains illustrations. In a picture book, both the picture and text are equally important. The text and illustrations of high-quality picture books weave rich stories that can excite and…

  7. Polymer infiltration studies

    NASA Technical Reports Server (NTRS)

    Marchello, Joseph M.

    1992-01-01

    The preparation is reported of carbon fiber composites using advanced polymer resins. Current and ongoing research activities include: powder towpreg process; weaving, braiding and stitching dry powder prepreg; advanced tow placement; and customized ATP towpreg. The goal of these studies is to produce advanced composite materials for automated part fabrication using textile and robotics technology in the manufacture of subsonic and supersonic aircraft.

  8. Basketmaking among the Karuk.

    ERIC Educational Resources Information Center

    Bennett, Ruth, Ed.; Shaw, Carolyn Risling

    A description of basket weaving techniques and materials used by the Karuk Indians of northwestern California includes illustrations and Karuk language terms so that the booklet may be used to enrich Karuk bilingual classes as well as to interest knowledgeable basketweavers. A section on materials discusses identifying, gathering, and preparing…

  9. Co-Opting Science: A Preliminary Study of How Students Invoke Science in Value-Laden Discussions

    ERIC Educational Resources Information Center

    Nielsen, Jan Alexis

    2012-01-01

    Letting students deliberate on socio-scientific issues is a tricky affair. It is yet unclear how to assess whether, or even support that, students weave science facts into value-laden socio-scientific deliberations without committing the naturalistic fallacy of deducing "ought" from "is". As a preliminary step, this study investigated how Danish…

  10. One Eye on the Curriculum, One Ear on the Kids: Elementary Teachers' Efforts to Incorporate Student Ideas into Inquiry Science Lessons

    ERIC Educational Resources Information Center

    Moskovitz, Kathie Davis

    2010-01-01

    The literature identifies methods that teachers can use to uncover student interests, and describes ways of responding that allow students to become involved in authentic science experiences. Missing from the literature are studies that examine teachers' thinking about student ideas, and the decision-making process they go through to weave student…

  11. Proposal for Teaching Evolutionary Biology: A Bridge between Research and Educational Practice

    ERIC Educational Resources Information Center

    Alvarez Pérez, Eréndira; Ruiz Gutiérrez, Rosaura

    2016-01-01

    We present quantitative results for the doctoral thesis of the first-named author of this article. The objective was to recommend and test a teaching proposal for core knowledge of evolutionary biology in secondary education. The focus of the study is "Problem cores in teaching". The "Weaving evolutionary thinking" teaching…

  12. Build a Band Hands-on Challenge: Investigate Sound with PBS's "Design Squad Nation"[TM

    ERIC Educational Resources Information Center

    Feinberg, Lauren

    2010-01-01

    This article describes "Build a Band" hands-on activity from "Design Squad Nation," which allows kids to use simple materials to build a four-stringed instrument, then tune it and play a song. Kids explore frequency, pitch, and sound energy while following the steps of the engineering design process. By weaving "Design Squad Nation" episodes,…

  13. Using Response Surface Methods to Correlate the Modal Test of an Inflatable Test Article

    NASA Technical Reports Server (NTRS)

    Gupta, Anju

    2013-01-01

    This paper presents a practical application of response surface methods (RSM) to correlate a finite element model of a structural modal test. The test article is a quasi-cylindrical inflatable structure which primarily consists of a fabric weave, with an internal bladder and metallic bulkheads on either end. To mitigate model size, the fabric weave was simplified by representing it with shell elements. The task at hand is to represent the material behavior of the weave. The success of the model correlation is measured by comparing the four major modal frequencies of the analysis model to the four major modal frequencies of the test article. Given that only individual strap material properties were provided and material properties of the overall weave were not available, defining the material properties of the finite element model became very complex. First it was necessary to determine which material properties (modulus of elasticity in the hoop and longitudinal directions, shear modulus, Poisson's ratio, etc.) affected the modal frequencies. Then a Latin Hypercube of the parameter space was created to form an efficiently distributed finite case set. Each case was then analyzed with the results input into RSM. In the resulting response surface it was possible to see how each material parameter affected the modal frequencies of the analysis model. If the modal frequencies of the analysis model and its corresponding parameters match the test with acceptable accuracy, it can be said that the model correlation is successful.

  14. Geographies of Indigenous Leaders: Landscapes and Mindscapes in the Pacific Northwest

    ERIC Educational Resources Information Center

    Marker, Michael

    2015-01-01

    This essay features three stories of "place-based" leadership in two Indigenous communities in the Pacific Northwest. Author Michael Marker weaves together stories from Nisga'a Elders in the Nass Valley of British Columbia, Coast Salish Elders in Washington State, and his own experiences as a researcher, teacher educator, and community…

  15. Art Education: Creative Textile Design I (Tentative Course Outline).

    ERIC Educational Resources Information Center

    Greenaway, Jean E.

    This document presents a course in creative textile design. Course objectives are: (1) The student will demonstrate his knowledge and understanding of the principles of design and composition through the completion of a textile design using one or more of the following methods: macrame, weaving, rug hooking, stitchery, applique, or any combination…

  16. Carbonized Silk Fabric for Ultrastretchable, Highly Sensitive, and Wearable Strain Sensors.

    PubMed

    Wang, Chunya; Li, Xiang; Gao, Enlai; Jian, Muqiang; Xia, Kailun; Wang, Qi; Xu, Zhiping; Ren, Tianling; Zhang, Yingying

    2016-08-01

    A carbonized plain-weave silk fabric is fabricated into wearable and robust strain sensors, which can be stretched up to 500% and show high sensitivity in a wide strain range. This sensor can be assembled into wearable devices for detection of both large and subtle human activities, showing great potential for monitoring human motions and personal health.

  17. (Re)Enacting Frontier Justice: The Bush Administration's Tactical Narration of the Old West Fantasy after September 11

    ERIC Educational Resources Information Center

    West, Mark; Carey, Chris

    2006-01-01

    The Bush administration's public discourse after September 11 weaves a new story embedded in the national myth of the Old West. Seen in its historical context of a frontier political mentality reaching back to the early 19th century, and in its broader communication context as the rhetorical narration of a defining cultural myth, the tactical…

  18. Marked Difference

    ERIC Educational Resources Information Center

    Lampela, Laurel

    2008-01-01

    Helen Cozza is a contemporary artist living in New Mexico who began working as a painter and moved into printmaking. Prevalent in her work is the use of the grid and the patterns created by weaving. The imagery is reminiscent of the environmental deterioration that Cozza observed in Buffalo and Cleveland where she lived for many years. Cozza knew…

  19. Review Forum: What's the Use of a Textbook in the Basic Communication Performance Course?

    ERIC Educational Resources Information Center

    Hess, John; Russ, Susan; McLish, Glen; Yook, Esther (Eunkyong) Lee; Worley, David W.; Olsen, Richard; Bollinger, David; Slagell, Amy R.; Cole, Robert A.

    1999-01-01

    Presents seven brief essays regarding the role of the textbook in basic communication courses. Addresses the proper function of a textbook, how instructors weave a textbook into their course, how students should be reading their textbooks, how students and instructors define the textbook's role, and what textbook features optimize and hinder the…

  20. 22 CFR 1104.2 - Definitions.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... pursuant to 25 CFR part 54; (2) Any other tribal entity acknowledged by the Secretary of the Interior pursuant to 25 CFR part 54 since the most recent publication of the annual list; (f) Person means an... ceramics, cordage, basketry and other weaving, bottles and other glassware, bone, ivory, shell, metal,...

  1. 18 CFR 1312.3 - Definitions.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... pursuant to 25 CFR part 54; (2) Any other tribal entity acknowledged by the Secretary of the Interior pursuant to 25 CFR part 54 since the most recent publication of the annual list; and (3) Any Alaska Native... ceramics, cordage, basketry and other weaving, bottles and other glassware, bone, ivory, shell, metal,...

  2. 18 CFR 1312.3 - Definitions.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... pursuant to 25 CFR part 54; (2) Any other tribal entity acknowledged by the Secretary of the Interior pursuant to 25 CFR part 54 since the most recent publication of the annual list; and (3) Any Alaska Native... ceramics, cordage, basketry and other weaving, bottles and other glassware, bone, ivory, shell, metal,...

  3. 36 CFR 296.3 - Definitions.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... pursuant to 25 CFR part 54; (2) Any other tribal entity acknowledged by the Secretary of the Interior pursuant to 25 CFR part 54 since the most recent publication of the annual list; and (3) Any Alaska Native... ceramics, cordage, basketry and other weaving, bottles and other glassware, bone, ivory, shell, metal,...

  4. 36 CFR 296.3 - Definitions.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... pursuant to 25 CFR part 54; (2) Any other tribal entity acknowledged by the Secretary of the Interior pursuant to 25 CFR part 54 since the most recent publication of the annual list; and (3) Any Alaska Native... ceramics, cordage, basketry and other weaving, bottles and other glassware, bone, ivory, shell, metal,...

  5. 36 CFR 296.3 - Definitions.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... pursuant to 25 CFR part 54; (2) Any other tribal entity acknowledged by the Secretary of the Interior pursuant to 25 CFR part 54 since the most recent publication of the annual list; and (3) Any Alaska Native... ceramics, cordage, basketry and other weaving, bottles and other glassware, bone, ivory, shell, metal,...

  6. 22 CFR 1104.2 - Definitions.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... pursuant to 25 CFR part 54; (2) Any other tribal entity acknowledged by the Secretary of the Interior pursuant to 25 CFR part 54 since the most recent publication of the annual list; (f) Person means an... ceramics, cordage, basketry and other weaving, bottles and other glassware, bone, ivory, shell, metal,...

  7. Enchanting Teachers among Us

    ERIC Educational Resources Information Center

    Richards, Jan

    2004-01-01

    The amazing power to enchant students often is a defining hallmark of great teachers. Enchanting teachers, those who make learning exciting and attractive, are all around, and each is effective and inspiring in his or her own unique way. Wonderful teachers generally weave their magic behind closed doors, however, where only their students can…

  8. Teaching Bioinformatics and Neuroinformatics by Using Free Web-Based Tools

    ERIC Educational Resources Information Center

    Grisham, William; Schottler, Natalie A.; Valli-Marill, Joanne; Beck, Lisa; Beatty, Jackson

    2010-01-01

    This completely computer-based module's purpose is to introduce students to bioinformatics resources. We present an easy-to-adopt module that weaves together several important bioinformatic tools so students can grasp how these tools are used in answering research questions. Students integrate information gathered from websites dealing with…

  9. Understanding Early Childhood Mental Health: A Practical Guide for Professionals

    ERIC Educational Resources Information Center

    Summers, Susan Janko, Ed.; Chazan-Cohen, Rachel, Ed.

    2012-01-01

    Integrating infant mental health services into early education programs leads to better child outcomes and stronger parent-child relationships--the big question is how to do it appropriately and effectively. Clear answers are in this accessible textbook, created to prepare early childhood professionals and programs to weave best practices in…

  10. Re-Learning the Traditional Art of Inuit Grass Basket-Making

    ERIC Educational Resources Information Center

    Cowan, Cindy

    2005-01-01

    This paper describes an adult learning project to revitalise the traditional Inuit art of weaving grass baskets. The participants involved in the project, all older women who speak an indigenous first language (Inuktitut) and who have limited experience with formal education, largely on their own initiative, undertook the process of successfully…

  11. Physical Development: Indoor Motor Activities

    ERIC Educational Resources Information Center

    Strickland, Eric

    2005-01-01

    In this article, the author features creative ways to fit a lot of movement and fun inside the classroom when there is bad weather. He suggests that, to be creative in the classroom, one can create crawling tunnels for children by moving chairs away from tables and draping sheets or towels over their tops and sides. Or one can weave an obstacle…

  12. Teaching with a Purpose in Mind: Cultivating a Vision

    ERIC Educational Resources Information Center

    Vaughn, Margaret; Faircloth, Beverly

    2013-01-01

    Across the nation, educators continue to face challenges as they work to individualize instruction to meet the specific needs of their students. However, theory suggests that teachers who possess a clear vision for teaching creatively weave their personal convictions for teaching with instructional practices. Drawing upon a teacher's (first…

  13. 10 CFR Appendix J to Subpart B of... - Uniform Test Method for Measuring the Energy Consumption of Automatic and Semi-Automatic Clothes...

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... with an adaptive control system. Therefore, pursuant to 10 CFR 430.27, a waiver must be obtained to... adaptive control systems, must submit a petition for waiver pursuant to 10 CFR 430.27 to establish an... cloth, made with a momie or granite weave, which is 50 percent cotton and 50 percent polyester...

  14. Arts Integration: What Is Really Happening in the Elementary Classroom?

    ERIC Educational Resources Information Center

    LaJevic, Lisa

    2013-01-01

    Researching how Arts Integration is practiced in a primary school, this article explores how elementary teachers understand, implement, and experience Arts Integration. Weaving together personal experiences, teacher interviews, focus group sessions, classroom observations, and written texts, I investigate how the arts are often devalued in Arts…

  15. Establishing a Framework for Quality

    ERIC Educational Resources Information Center

    Lehman, Kirby

    2006-01-01

    The Jenks School District applies a continuous improvement approach that focuses on academics, arts, activities, athletics and attitude, weaving in leadership, professional development, technology and data-based decision making to prepare all learners to be productive, responsible citizens. Since 1998, the Jenks School District has embraced a…

  16. Performing Narrative Medicine

    ERIC Educational Resources Information Center

    Langellier, Kristin M.

    2009-01-01

    In this article, the author weaves narrative medicine and performance together to consider what might it mean to call narrative medicine a performance. To name narrative medicine as performance is to recognize the texts and bodies, the stories and selves, that participate in its practice--patients' and physicians' embodied stories as well as the…

  17. Proceedings of the Annual Technology Literacy Conference. (7th, Alexandria, Virginia, February 6-9, 1992).

    ERIC Educational Resources Information Center

    Cheek, Dennis, Ed.

    The following papers are included in these proceedings: "Weaving Technology and Human Affairs" (B. Hazeltine); "Positivist and Constructivist Understandings about Science and Their Implications for STS Teaching and Learning" (B. Reeves; C. Ney); "A Modular Conceptual Framework for Technology and Work" (D. Blandow); "A Time of Uncertainty: The…

  18. Teaching the Moving Child: OT Insights That Will Transform Your K-3 Classroom

    ERIC Educational Resources Information Center

    Berkey, Sybil M.

    2009-01-01

    Because sensorimotor and environmental factors have a profound effect on children's learning, every teacher should know how to weave strategies from occupational therapy (OT) into their everyday instruction. This is the guidebook K-3 teachers need to "think like an OT"--and form effective partnerships with OTs in their schools--so all students can…

  19. Troublemaker: The Education of Chester Finn

    ERIC Educational Resources Information Center

    Finn, Chester E., Jr.

    2008-01-01

    "Troublemaker," the memoir of "Education Next" senior editor and veteran education reformer Chester E. "Checker" Finn Jr., weaves into the chronicle of Finn's life and career the broader history of education reform, in which he has played a vital and sometimes rambunctious role. Currently president of the Thomas B. Fordham Foundation and senior…

  20. Problem Solving: Getting to the Heart of Mathematics.

    ERIC Educational Resources Information Center

    Jarrett, Denise, Ed.

    2000-01-01

    This publication features articles that illustrate how several Northwest teachers are using problem solving to achieve rigorous and imaginative learning in their classrooms. Articles include: (1) "Open-Ended Problem Solving: Weaving a Web of Ideas" (Denise Jarrett); (2) "Teenager or Tyke, Students Learn Best by Tackling Challenging Math" (Suzie…

  1. Women of Mexico: The Consecrated and the Commoners, 1519-1900. La Mujer Latina Series.

    ERIC Educational Resources Information Center

    Gugliotta, Bobette

    This collective biography offers insight into the more famous and infamous women in Mexico's history and weaves the tale of how their ways and deeds have shaped both a culture and a nation. The book starts with the conquest and ends with the twentieth century, outlining the lives of Mexican women and their causes. The women described in the book…

  2. ARTISTS' IDEAS ABOUT ART AND THEIR USE IN EDUCATION.

    ERIC Educational Resources Information Center

    MICHAEL, JOHN A.

    SPECIFIC CONCEPTS OF PROFESSIONAL ARTISTS WERE SURVEYED FOR APPLICATION TO ART INSTRUCTION IN SECONDARY SCHOOLS. A REVIEW WAS MADE OF WRITINGS BY ARTISTS, CRITICS, AND HISTORIANS IN SEVERAL AREAS OF ART (ENAMELING, JEWELRY, PAINTING, POTTERY, PRINTMAKING, SCULPTURE, AND WEAVING). THE DATA GATHERED FROM THESE SOURCES OF ART EXPERIENCES WERE USED IN…

  3. Art of the Folk: Mexican Heritage through Arts and Crafts for Boys and Girls.

    ERIC Educational Resources Information Center

    Linse, Barbara

    Instructions for a variety of activities relating to Mexican culture are provided, with brief descriptive and historical notes on Mexican heritage. Arts and crafts from western, central, and southern Mexico are represented as well as many which are common to all of Mexico. Some of the activities included are weaving, chewing gum sculpture, paper…

  4. Meaningful confusions and confusing meanings in communication in schizophrenia

    PubMed Central

    Elvevåg, Brita; Wynn, Rolf; Covington, Michael A.

    2010-01-01

    Unconventional discourse in schizophrenia has been speculated to be attributable to the mixing up of symbols and signs. We illustrate how a series of scientific images, cartoons, and prose are used by a patient to weave disparate - and objectively unrelated -concepts. The resulting prose is incoherent science. PMID:20843559

  5. Now We Get It! Boosting Comprehension with Collaborative Strategic Reading

    ERIC Educational Resources Information Center

    Klingner, Janette K.; Vaughn, Sharon; Boardman, Alison; Swanson, Elizabeth

    2012-01-01

    Collaborative Strategic Reading is an innovative new approach to teaching reading that weaves together two instructional programs: cooperative learning and reading comprehension strategy instruction. In small groups, students work through the four main steps-Preview, "Click and Clunk," Get the Gist, and Wrap Up-helping each other improve…

  6. Four Ways.

    ERIC Educational Resources Information Center

    Dwyer, Mary Ellen; And Others

    1984-01-01

    Four art activities for high school students are described: (1) weaving using a vegetable sack; (2) creating kaleidoscope designs, from which students selected a unique, basic shape for a personalized belt buckle; (3) making boomerangs which, when thrown, return to the point of departure; and (4) constructing a mosaic in the school hall. (RM)

  7. 40 CFR 63.4281 - Am I subject to this subpart?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ..., sheets, tents, threads and V-belts. The coating and printing subcategory includes any fabric or other... abrasion resistance during weaving. (3) The dyeing and finishing subcategory includes any operation that... and to textile cord used in the production of belts and hoses. (3) Coating, slashing, dyeing,...

  8. "Outsiders within"? Deconstructing the Educational Administration Scholar

    ERIC Educational Resources Information Center

    Wilkinson, Jane; Eacott, Scott

    2013-01-01

    In this paper, we weave the auto-ethnographic narratives of the two authors with Bourdieu's key concepts of "habitus," "field" and "capital," as we seek to bring to a level of explicitness the reflexive lens which has shaped our scholarly work. In particular, we examine the process of becoming educational…

  9. Making Standards Work! A Teacher's Guide to Contextual Learning: Integrating Academic Content Standards with Career Development and Workplace Competencies.

    ERIC Educational Resources Information Center

    Colorado School to Career Partnership, Denver.

    This publication is a tool to help educators weave academic content standards, assessments, and school-to-career methods into an integrated and comprehensive educational strategy that prepares all students to meet their future goals. Examples included in the publication were created by Colorado educators to provide a vision of how teachers can…

  10. Get 'Em outside

    ERIC Educational Resources Information Center

    Weise, Lisa

    2012-01-01

    There is a movement afoot in the nation--one that goes against the trend toward more testing, less recess, and too many standards to fit into the school day. This movement does not ignore standards; rather, it weaves the standards with the places and meanings that are ever-present outside of the classrooms. Place-based education connects students…

  11. Flexible-pile thermal sealant

    NASA Technical Reports Server (NTRS)

    Anderson, G. E.; Fell, D. M.; Tesinsky, J. S.

    1977-01-01

    Brushlike material insulates variable-width gaps where severe thermal stress is present. Weave-and-tuft strip has low thermal conductivity, working temperature range from -454 to 2,000 F, low load compressibility, and good inhibition of plasma flow.

  12. Representing Latino/a Culture in Introductory Spanish Textbooks.

    ERIC Educational Resources Information Center

    Elissondo, Guillermina

    This paper examines the kinds of visuals that Spanish language textbooks use to legitimize Latino/a culture, noting how different groups are presented and represented by the narratives; how ethnicity, class, gender, age, and sexual inclinations interplay with power relations, and what ideologies weave the textual fabric of foreign language books.…

  13. The European Universities, Citizenship and Its Limits: What Won't Solve the Problems of Our Time

    ERIC Educational Resources Information Center

    Lock, Grahame; Martins, Herminio

    2009-01-01

    This article attempts to weave together in an original manner a number of themes regarding citizenship and higher education in Europe. Thus, the authors look critically at the notion of citizenship itself; its role in Aristotle and in Hegel's state-versus-civil-society contrast; its relation to the world of work or labour; its connection with the…

  14. A Computational Lens on Design Research

    ERIC Educational Resources Information Center

    Hoyles, Celia; Noss, Richard

    2015-01-01

    In this commentary, we briefly review the collective effort of design researchers to weave theory with empirical results, in order to gain a better understanding of the processes of learning. We seek to respond to this challenging agenda by centring on the evolution of one sub-field: namely that which involves investigations within a…

  15. Pre-Service Teachers' Maturing Perceptions of a TPACK-Framed Signature Pedagogy in Science Education

    ERIC Educational Resources Information Center

    Hechter, Richard P.

    2012-01-01

    Teacher education programs across North America are transforming. What were once piecemeal programs consisting of often unrelated courses are now becoming coherent and intertwined trajectories toward teacher certification. Part of this transformation can be attributed to the weaving of "signature pedagogies" throughout overarching program…

  16. Seeking the "Truth" in the Stories We Tell: The Role of Critical Race Epistemology in Higher Education Research

    ERIC Educational Resources Information Center

    Espino, Michelle M.

    2012-01-01

    This article focuses on how critical race theory informed the author's epistemological perspective and methodological approach as she analyzed Mexican American educational narratives and formulated her identity as a scholar. Using a storytelling technique employed in CRT, the author weaves together her position as the translator of participants'…

  17. Transsexuals: Teaching Your Children

    ERIC Educational Resources Information Center

    Krywanczyk, Loren

    2010-01-01

    The main point the author hopes to impart in this article is how essential it is for educators to create an environment in classrooms where they and their students are comfortable talking about issues of gender. In order for this to happen, it is important to weave concepts of gender into the curricula and refrain from a tokenizing approach that…

  18. 1. EXTERIOR VIEW OF HILLSIDE PLANT FROM INTERSECTION OF LINCOLN ...

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

    1. EXTERIOR VIEW OF HILLSIDE PLANT FROM INTERSECTION OF LINCOLN STREET AND 2ND AVENUE. HILLSIDE PLANT WAS BUILT AS CALLAWAY MILLS HILLSIDE COTTON MILL (PARK A. DALLIS, 1914-15). THIS TWO-STORY SECTION WAS BUILT AS A WEAVE SHED. - Hillside Cotton Mill, 1300 Brownwood Avenue, La Grange, Troup County, GA

  19. Studying Local History in the Digital Age: The Story of Asaph Perry

    ERIC Educational Resources Information Center

    Lee, John K.; Clarke, W. Guy

    2004-01-01

    In this article, the authors speak of an encounter they had in which they discovered some forgotten and unused historical resources hidden in a storage closet at the Cherokee County Georgia Historical Society. From these resources, they were able to weave an intriguing narrative encompassing people and events in history. They hope their story will…

  20. Documenting the New American Scholarship: Tenure and Promotion Dossier Narratives.

    ERIC Educational Resources Information Center

    Smith, Terra L.

    Tenure and promotion narratives are opportunities for scholars to weave a tapestry of understanding of their own scholarly pursuits. The quality of such narratives may be considered a reflection of the care scholars take to communicate scholarship. Although they can be an intentional act of scholarship, tenure and promotion essays are rarely…

  1. An Organic Education.

    ERIC Educational Resources Information Center

    Adshead, Mary Lois Timbes

    2001-01-01

    A former student reminisces about attending the Organic School in Fairhope, Alabama, in the 1950s. Founded in 1903, the school pioneered child-centered education; had multigraded classes; incorporated dance, pottery, weaving, and art into the curriculum; and was guided generally by the philosophy that education is not preparation for life, but…

  2. Tapping Ancient Roots: Plaited Paper Baskets

    ERIC Educational Resources Information Center

    Patrick, Jane

    2011-01-01

    With ancient roots, basket making has been practiced since the earliest civilizations, and according to textile experts, probably pre-dates pottery. This is partly conjecture since few baskets remain. It is through evidence found in clay impressions that the earliest baskets reveal themselves. Basically, basketry construction is like flat weaving.…

  3. Trajectories of At-Homeness and Health in Usual Care and Small House Nursing Homes

    ERIC Educational Resources Information Center

    Molony, Sheila L.; Evans, Lois K.; Jeon, Sangchoon; Rabig, Judith; Straka, Leslie A.

    2011-01-01

    Background: Long-term care providers across the United States are building innovative environments called "Green House" or small-house nursing homes that weave humanistic person-centered philosophies into clinical care, organizational policies, and built environments. Purpose: To compare and contrast trajectories of at-homeness and health over…

  4. Civility and Citizenship: The Roots of Community Connection.

    ERIC Educational Resources Information Center

    Ludick, Patricia

    2002-01-01

    Weaves into the adolescent concept of community those Montessori ideas related to laws of human personality, nature, and society. Examines components of Montessori practice and theory, including the importance of work, the prepared environment, social cohesion, the imagination, and the absorbent mind by linking early childhood and adolescence.…

  5. Summer Reading Adventure! Tips for Parents of Young Readers = La lectura...Una aventura para el verano: Ideas para padres de ninos que apenas comienzan a leer.

    ERIC Educational Resources Information Center

    Moss, Jeanette

    Over the summer, many children lose ground in the reading skills they are building at school. Weave reading into the family's summer, and children will go back to school refreshed, excited, and ready to pick up where he or she left off. Advice for parents and caregivers includes: seek out books and reading materials that tie into children's summer…

  6. Navajo Arts and Crafts.

    ERIC Educational Resources Information Center

    Roessel, Robert A., Jr.

    A profusely-illustrated book on Navajo arts and crafts, from the Navajo Curriculum Center, includes sections on weaving, silversmithing, basket making, pottery making, and the economics of Navajo arts and crafts. The book is intended for use by Navajo students and Navajo people in general, so they can read about their arts and crafts from a Navajo…

  7. Funds of Knowledge and Community Cultural Wealth: Exploring How Pre-Service Teachers Can Work Effectively with Mexican and Mexican American Students

    ERIC Educational Resources Information Center

    Saathoff, Stacy D.

    2015-01-01

    This article examines how pre-service teachers can work effectively with Mexican and Mexican American students. Using the foundation of funds of knowledge (González, Moll, & Amanti, 2005) and the critical race theory concept of community cultural wealth (Yosso, 2005), the article weaves together these ideas to discuss how they can be…

  8. Beyond the Core: Peer Observation Brings Common Core to Vocational and Electives Classes

    ERIC Educational Resources Information Center

    Thurber Rasmussen, Harriette

    2014-01-01

    This article describes how a Washington State School District increased professional learning around the Common Core State Standards. The challenge was how to establish a way for career and technical education and electives teachers to learn and apply Common Core in their classes. Weaving Common Core literacy standards into vocational and…

  9. Stories in the Cloth: Art Therapy and Narrative Textiles

    ERIC Educational Resources Information Center

    Garlock, Lisa Raye

    2016-01-01

    In this article I weave together the relevance of narrative textile work in therapeutic and human rights contexts; showcase Common Threads, an international nonprofit that uses story cloths with survivors of gender-based violence; outline a master's level art therapy course in story cloths; and relate how textiles helped build a sibling…

  10. Study Abroad, Foreign Language Use, and the Communities Standard

    ERIC Educational Resources Information Center

    Allen, Heather Willis; Dupuy, Beatrice

    2012-01-01

    Although participation in multilingual communities around the world has been understood to be the raison d'etre for foreign language study, the Communities standard has been portrayed as an extracurricular experience and more difficult to weave into instruction than the other standards. This article addresses two questions: (1) Does a study abroad…

  11. Engaging Families and Communities: Pathways to Educational Success.

    ERIC Educational Resources Information Center

    Decker, Larry E.; Decker, Virginia A.

    This book is intended to help educators weave some of the best ideas for creating and maintaining family and community engagement into a comprehensive family-school-community involvement program tailored to their own communities. The goal of such an initiative must be to help all children succeed academically so that they can live productive lives…

  12. Inform, Perform, Transform: Modeling In-School Youth Participatory Action Research through Gameplay

    ERIC Educational Resources Information Center

    Garcia, Antero

    2012-01-01

    In this article, the author explores youth participatory action research (YPAR) through gameplay. He describes Ask Anansi, an alternate reality game (ARG) played in the "real world" by weaving elements of storytelling and fiction into the environment played as part of class experience. This game which the author created drove the research process…

  13. Improving Writing: Resources, Strategies, Assessments.

    ERIC Educational Resources Information Center

    Lenski, Susan Davis; Johns, Jerry L.

    Comprehensive and practical, this book provides resources, strategies, and assessments that seamlessly weave writing into everyday classroom routines. The resources in the book include reproducible student worksheets, transparency masters, teacher and student examples, and technology tips in the form of Web site addresses. Strategies throughout…

  14. Language of Physics, Language of Math: Disciplinary Culture and Dynamic Epistemology

    ERIC Educational Resources Information Center

    Redish, Edward F.; Kuo, Eric

    2015-01-01

    Mathematics is a critical part of much scientific research. Physics in particular weaves math extensively into its instruction beginning in high school. Despite much research on the learning of both physics and math, the problem of how to effectively include math in physics in a way that reaches most students remains unsolved. In this paper, we…

  15. Dream Weavers.

    ERIC Educational Resources Information Center

    Selcraig, Bruce

    2003-01-01

    With their sought-after hand-loomed rugs, the Zapotec artisans of Teotitlan, Mexico, have gained a level of prosperity rarely found in Latin America's Indian villages. Immersed in the processes of preparing wool and weaving rugs from an early age, Zapotec weavers both maintain traditional designs and create original works of art inspired by modern…

  16. Practical Tips for Increasing Listening Practice Time

    ERIC Educational Resources Information Center

    McCaughey, Kevin

    2015-01-01

    Learning a language--like learning to dance ballet, weaving carpets, or playing the saxophone--takes time and practice. In general, it is safe to say that the more practice one gets, the better one will become. This article will help teachers of English reconsider how to think about listening tasks. It will provide guidance for increasing…

  17. 13. Photocopy of engraving from History of Westchester County, Vol. ...

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

    13. Photocopy of engraving from History of Westchester County, Vol. 2, by J. Thomas Scharf, published by L.E. Preston & Company, Philadelphia, 1886 ALEXANDER SMITH AND SONS CARPET COMPANY, MOQUETTE MILLS, WEAVING MILLS, SPINNING AND PRINT MILLS - Moquette Row Housing, Moquette Row North & Moquette Row South, Yonkers, Westchester County, NY

  18. Skin lesions in carpet hand-weavers.

    PubMed

    Noorbala, M T

    2008-03-15

    Carpet hand-weaving is an important industry in Iran. The repetitive trauma to hands in this occupation produces typical nodules and plaques. The skin lesions from 150 carpet weavers are reported. The characteristic carpet nodule is clinically and histologically described.

  19. Examining PT3 Projects Designed to Improve Preservice Education

    ERIC Educational Resources Information Center

    Mims, Clif; Polly, Drew; Shepherd, Craig; Inan, Fethi

    2006-01-01

    One of the current goals of public education is technology integration. This is witnessed in current educational literature, by the enormous sums of money schools, colleges, and departments of education (SCDEs) spend to purchase equipment and in the emphasis on weaving technology into the fabric of the educational curriculum. As the integration…

  20. Art Teaching Guides: Using Cloth and Trimmings, Yarns and Fibers, Grades 2-6. Curriculum Bulletin No. 8d, 1968-69 Series.

    ERIC Educational Resources Information Center

    New York City Board of Education, Brooklyn, NY. Bureau of Curriculum Development.

    Creating with fabrics, yarns, and fibers--from early basic explorations in handling an assortment of cloths and trimmings, through experiments with stitching and weaving, to the designing and making of bags, hats, and costumes that children can use--is the focus of this curriculum guide. For each grade (2-6), guidelines are provided on (1)…

  1. The Electronic FERPA: Access in the Digital Age

    ERIC Educational Resources Information Center

    McConahay, Mark; Hanson, Karen; West, Ann; Woodbeck, Dean

    2009-01-01

    On every college and university campus, common themes weave throughout identity and access management (IAM) and its relationship to Family Educational Rights and Privacy Act (FERPA). Institutions approach IAM differently as there is not a one-size-fits-all solution. Nevertheless, all face common elements. Over the past few years, a number of…

  2. Confessions of Practice: Multidimensional Interweavings of Our Work as Teacher Educators

    ERIC Educational Resources Information Center

    Snow, Jennifer L.; Martin, Susan M.

    2014-01-01

    In this article, we describe our inquiry and confess how our work as teacher educators weaves through multiple contexts and roles to reinforce a stronger enactment and construction of knowledge and practical relevance. We examined the complex nature of teacher education roles through collaborative self-study. Questions included the following: What…

  3. Family-School Relations as Social Capital: Chinese Parents in the United States

    ERIC Educational Resources Information Center

    Wang, Dan

    2008-01-01

    Guided by both Coleman and Bourdieu's theories on social capital, I interviewed Chinese immigrant parents to understand their experiences in weaving social connections with the school and teachers to benefit their children's education. This study confirms Coleman's argument that human capital in parents will not transfer to the children…

  4. Caught in the Act: Integrative Studies Where I Least Expected It

    ERIC Educational Resources Information Center

    Williams, Jeff

    2013-01-01

    Weaving together stories from history, as well as his own experience, Mr. Williams speaks about how critical public works and policy questions cannot be solved by people trained in one discipline in isolation--arguing that the hyper-specialization of the 20th century swung the pendulum too far. He closes with a reminder of how integrative studies…

  5. Creativity in Biographical Writing as the Necessary Fictions of Nonfiction.

    ERIC Educational Resources Information Center

    Feldman, Paula R.

    Biographical writing is highly imaginative writing and always has been. The task of the biographer is to weave a riveting story from the fabric of the subject's life. For example, a single pivotal incident in the lives of Percy Bysshe Shelley, the English poet, and Mary Godwin, author of "Frankenstein", at the grave of Mary's mother, Mary…

  6. Rethinking Mathematics: Teaching Social Justice by the Numbers

    ERIC Educational Resources Information Center

    Gutstein, Eric, Ed.; Peterson, Bob, Ed.

    2005-01-01

    This unique collection of more than 30 articles shows teachers how to weave social-justice principles throughout the math curriculum, and how to integrate social-justice math into other curricular areas as well. "Rethinking Mathematics" presents teaching ideas, lesson plans and reflections by practicing classroom teachers and distinguished…

  7. Campfire Stories with George Catlin--An Encounter of Two Cultures.

    ERIC Educational Resources Information Center

    National Museum of American Art, Washington, DC.

    This lesson plan collection focuses on attitudes and opinions held by Native Americans and European Americans about the United States. The lesson plans are arranged in four sections: (1) "Ancestral Lands" (Debating for Land; Making Treaties and Weaving Wampum; Pipestone Quarry and Westward Expansion: Whose Rock Is It Anyway); (2) "Catlin's Quest"…

  8. Textile Arts of India, Curriculum Project. Fulbright Hays Summer Seminar Abroad 1995 (India).

    ERIC Educational Resources Information Center

    Myers, Barbara

    This interdisciplinary unit focuses on five techniques found in the textile arts of India: tie-dye, embroidery, applique, block printing, and weaving. The unit is designed for students in third through sixth grades but could be adapted to other levels. This unit could be incorporated with a study of India's land, history, and geography. The…

  9. Identifying, Confronting and Disrupting Stereotypes: Role on the Wall in an Intergenerational LGBTQ Applied Theatre Project

    ERIC Educational Resources Information Center

    Houseal, Jennifer; Ray, Kevin; Teitelbaum, Sherry

    2013-01-01

    In New York City, LGBTQ people from different generations have had few opportunities to connect. They have splintered into age-segregated micro-communities, robbing them of opportunities to weave a common history and share strategies that community members have used to survive and thrive. "Bridging the Gap" was a community-based intergenerational…

  10. Blurred Lines: The School Librarian and the Instructional Technology Specialist

    ERIC Educational Resources Information Center

    Johnston, Melissa P.

    2015-01-01

    "Empowering Learners: Guidelines for School Library Media Programs" (AASL, 2009) charges school librarians "to play a leading role in weaving such skills throughout the curriculum so that all members of the school community are effective users of ideas and information" (p. 46). Providing leadership in technology integration for…

  11. Teacher Knowledge: A Complex Tapestry

    ERIC Educational Resources Information Center

    Adoniou, Misty

    2015-01-01

    Teachers need to know a great deal, in many areas and in multiple ways. Teacher knowledge is a complex tapestry, and teachers must successfully weave the multiple threads. In this article, I present a conceptualisation of teacher knowledge that provides a framework for describing the complexity of teacher knowledge. The framework describes three…

  12. The Human Rights Act 1998--legal implications for those engaged in infertility services.

    PubMed

    Maunder, Judith

    2004-03-01

    This review considers some recent human rights cases in the field of assisted reproduction and explores how the UK courts are seeking to weave their way through the complex legal and ethical issues in this sensitive field to balance the competing rights of those seeking infertility treatment, gamete donors and their offspring.

  13. 1. EXTERIOR VIEW OF BOILER HOUSE FROM SOUTHWEST. THE BOILER ...

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

    1. EXTERIOR VIEW OF BOILER HOUSE FROM SOUTHWEST. THE BOILER HOUSE WAS USED FOR HEATING THE MILL; HYDRO-ELECTRIC POWER FOR PRODUCTION WAS PURCHASED FROM THE COLUMBUS LIGHT & POWER COMPANY. NORTH END OF 1924 MILL TO RIGHT, c. 1970 WINDOWLESS WEAVE ROOM ADDITION TO LEFT. - Stark Mill, Boiler House, 117 Corinth Road, Hogansville, Troup County, GA

  14. 24. VIEW INSIDE BRICK ADDITION ON SOUTHWEST END OF ORIGINAL ...

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

    24. VIEW INSIDE BRICK ADDITION ON SOUTHWEST END OF ORIGINAL MILL, LOOKING NORTH. NOTE WOOD TRUSSES AND FLUTED COLUMNS (CAST IRON WITH EGYPTIAN REVIVAL CAPITAL). THIS SECTION OF THE MILL WAS PROBABLY PART OF THE WEAVE ROOM ADDITIONS DURING THE 1860s. - Graniteville Mill, Marshall Street, Graniteville, Aiken County, SC

  15. Provisions of Trustworthiness in Critical Narrative Research: Bridging Intersubjectivity and Fidelity

    ERIC Educational Resources Information Center

    Moss, Glenda

    2004-01-01

    This paper is a reflective-reflexive examination of provisions of trustworthiness in critical narrative research. The author presents her understanding of provisions of trustworthiness as a science and as an art, and blurs these boundaries as she acknowledges their tension in practice. She weaves between theory and her experience in two…

  16. Living Willow Huts

    ERIC Educational Resources Information Center

    Keeler, Rusty

    2007-01-01

    Living Willow Huts are inexpensive to make, fun to plant, easy to grow, and make beautiful spaces for children. They involve planting dormant willow shoots in the ground and weaving them into shapes that will sprout and grow over time. People have been creating similar living architecture throughout the world for centuries in the forms of living…

  17. Transformative Learning in Human Resource Development: Successes in Scholarly Practitioner Applications--Conflict Management, Discursive Processes in Diversity and Leadership Development

    ERIC Educational Resources Information Center

    Fisher-Yoshida, Beth; Geller, Kathy D.; Wasserman, Ilene C.

    2005-01-01

    Today's complex global environment calls for leaders to be agile decision makers, engage in critical self-reflection, integrate reflection with action, and partner with those who are different in significant ways. These capabilities and skills are the core qualities of transformative learning. This paper weaves research findings that explore…

  18. "The Changeover," a Fantasy of Opposites.

    ERIC Educational Resources Information Center

    Raburn, Josephine

    1992-01-01

    Asserts that "The Changeover," by Margaret Mahy, is a fantasy of opposites which try to explain the feminine psyche and the universe. Shows how Mahy weaves Maori animism, pre-Hellenic moon mythology, Christianity, Jungian psychology, and modern science into one rich human tapestry of thought. (PRA)

  19. Teaching/Learning in a Social Community: A Taxonomy of Social Interactions among Elementary Teachers.

    ERIC Educational Resources Information Center

    Heine, David A.

    School faculties are complex social communities consisting of countless social interactions that weave the larger web of social relationships. Collective observations of 16 teachers and the author, in an Indiana elementary school over 1 year, identified several distinct forms of social encounters: affirmations are interactions that, while serving…

  20. How Can a Teacher Begin to Help Her Kindergarten Students Gain "Authentic" Cultural Understandings about Native North Americans through Children's Literature?

    ERIC Educational Resources Information Center

    Pyterek, Margaret McNeil

    2006-01-01

    The goals of this "Action Research" study were to understand how to create an anti-bias curriculum project focusing on Native North Americans and how to teach children to recognize stereotypes in children's literature, while using "The Project Approach" (Helm & Katz, 2001) to do the formative curriculum development. The study weaves together three…

  1. Toward a Social Conflict Evolution Model: Examining the Adverse Power of Conflictual Social Interaction in Online Learning

    ERIC Educational Resources Information Center

    Xie, Kui; Miller, Nicole C.; Allison, Justin R.

    2013-01-01

    This case study examined an authentic online learning phenomenon where social conflict, including harsh critique and negative tone, weaved throughout peer-moderated online discussions in an online class. Opening coding and content analysis were performed on 1306 message units and course artifacts. The results revealed that a model of social…

  2. Towards a Pedagogy of the Incomprehensible: Trauma and the Imperative of Critical Witness in Literacy Classrooms

    ERIC Educational Resources Information Center

    Dutro, Elizabeth

    2013-01-01

    In this article, I explore questions about what it means to carry, live and invite traumatic stories into the space of a literacy classroom. Weaving illustrative moments from the classroom with trauma theory and research, I ask, What does it mean to embrace the incomprehensible in literacy classrooms? How might the incomprehensible be viewed as a…

  3. Meaningful confusions and confusing meanings in communication in schizophrenia.

    PubMed

    Elvevåg, Brita; Wynn, Rolf; Covington, Michael A

    2011-04-30

    Unconventional discourse in schizophrenia has been speculated to be attributable to the mixing up of symbols and signs. We illustrate how a series of scientific images, cartoons, and prose are used by a patient to weave disparate-and objectively unrelated-concepts. The resulting prose is incoherent science. PMID:20843559

  4. "Holes": Folklore Redux.

    ERIC Educational Resources Information Center

    Mascia, Elizabeth G.

    2001-01-01

    Demonstrates that a careful reading of the book for young adults, "Holes" by Louis Sachar, reveals how this contemporary story is grounded in folklore, and that it is this debt to folk literature that allows readers to accept an improbable plot. Shows how the story weaves together elements from traditional folk literature and stretches them across…

  5. Brown v. Board of Education: A Civil Rights Milestone and Its Troubled Legacy. Pivotal Moments in American History.

    ERIC Educational Resources Information Center

    Patterson, James T.

    This book presents a narrative version of Brown v. Board of Education of Topeka, Kansas, which struck down state-sponsored racial segregation in America's schools. It analyzes the origins and consequences of that landmark case, illuminating the legal, political, and social implications of this decision. The book weaves many controversial issues…

  6. Dancing on the Bottom Line: An Unruly Cost-Benefit Analysis of Three Academic Development Initiatives

    ERIC Educational Resources Information Center

    Sword, Helen

    2014-01-01

    This article offers an unconventional cost-benefit analysis of three academic development initiatives at a large Australasian university: a three-day foundation course for new academics, a series of one-on-one teaching consultations and a two-year postgraduate certificate program. Weaving together qualitative, quantitative and arts-based…

  7. Power Teaching

    ERIC Educational Resources Information Center

    Fluellen, Jerry E., Jr.

    2007-01-01

    Power Teaching weaves four factors into a seamless whole: standards, teaching thinking, research based strategies, and critical inquiry. As a prototype in its first year of development with an urban fifth grade class, the power teaching model connects selected district standards, thinking routines from Harvard University Project Zero Research…

  8. Mathematizing Read-Alouds in Three Easy Steps

    ERIC Educational Resources Information Center

    Hintz, Allison; Smith, Antony T.

    2013-01-01

    Discussing and exploring concepts is an important element of literacy and mathematics instruction in elementary classrooms. Read-alouds provide an opportunity for teachers to engage students in meaningful discussion. This article describes a quick three-step process for mathematizing books, that is, weaving together read-alouds, discussion, and…

  9. "EMERGING" POLLUTANTS, AND COMMUNICATING THE SCIENCE OF ENVIRONMENTAL CHEMISTRY AND MASS SPECTROMETRY: PHARMACEUTICALS IN THE ENVIRONMENT

    EPA Science Inventory

    This paper weaves a rnulti-dimensioned perspective of mass spectrometry as a career against the backdrop of mass spectrometry's key role in the past and future of environmental chemistry. Along the way, some insights are offered for better focusing the spotlight on the discipline...

  10. Digital Literacies Go to School: Potholes and Possibilities

    ERIC Educational Resources Information Center

    O'Brien, David; Scharber, Cassandra

    2008-01-01

    Oftentimes it seems that education, as an institution, is populated by persons who work to preserve practices of the past and who do not depend upon or explore the advantages of digital literacies. Digital literacies, however, are here to stay--they are at the core of new literacies--and educators should consider how to best weave together old,…

  11. Braid read-only memory

    NASA Technical Reports Server (NTRS)

    Mckenna, J. F.

    1973-01-01

    Transformer-type memory is fault-tolerant array of independent read-only memory units. Information pattern in each unit is written by weaving wires through array of linear (nonswitching) transformers. Presence or absence of a bit is determined by whether a given wire threads or bypasses given transformer.

  12. The Three Rs: Reflect, Rejoice, Renew

    ERIC Educational Resources Information Center

    Brinckmeyer, Lynn

    2007-01-01

    It's astonishing how quickly an academic year goes by. Summer provides opportunities for music teachers to reflect. Most teacher will spend a portion of their summer thinking about things such as fine-tuning management skills, weaving higher-level thought processes into general music lessons, and enhancing ensemble rehearsal pacing. In this…

  13. Working with Corn: Two Conversations. Interview with Mohawk Midwife Katsi Cook in Her Home on June 6, 1992.

    ERIC Educational Resources Information Center

    Cornelius, Carol

    1992-01-01

    Presents interviews with a Mohawk midwife and an Onondaga chief concerning the importance of corn in Native American culture. Compares gestational cycle of corn to that of women. Describes the numerous uses of corn from eating and weaving. Explains how Native Americans and non-Native Americans can be taught about corn by incorporating art,…

  14. Confronting Discrimination and the Integrative Curriculum.

    ERIC Educational Resources Information Center

    Manning-Miller, Carmen

    1993-01-01

    Argues for the importance of weaving disability issues into all the courses in a journalism curriculum. Discusses ways to do so in classes on the news editorial, on public relations and advertising, and on mass media history, policy, and ethics. (SR)

  15. The Simultaneity of Experience: Cultural Identity, Magical Realism and the Artefactual in Digital Storytelling

    ERIC Educational Resources Information Center

    Honeyford, Michelle A.

    2013-01-01

    This paper explores how students, as multimodal storytellers, can weave powerful narratives blending modes, genres, artefacts and literary conventions to represent the real and imagined in their lives. Part of a larger ethnographic case study of student writing in a middle years class for immigrant students learning English as an additional…

  16. A Rainbow of Threads

    ERIC Educational Resources Information Center

    Mack, Stevie

    2011-01-01

    In the highlands of Guatemala, the Maya Indians weave colorful, vibrant textiles. Many of these beautiful fabrics are used to make traditional clothing for the men, women, and children who live in the rural villages. In Mayan culture, dress is important for more than just keeping warm and covered. It serves as a sort of uniform that immediately…

  17. Felting as Expressive Art Form.

    ERIC Educational Resources Information Center

    Cirillo, Sandi

    1998-01-01

    Describes felting as the process of making felt using sheep's wool from fibers without weaving or knitting. Explains that teachers can incorporate felting into a lesson exploring the background behind this process, as an extension of collage or textile arts, as a means to studying abstract art, or in a fashion design unit. (CMK)

  18. Children of Deb Koh: Young Life in an Iranian Village.

    ERIC Educational Resources Information Center

    Friedl, Erika

    This book is based on ethnographic research carried out between 1965 and 1994 during eight visits to a tribal region in southwest Iran. The book weaves together local practices, cognitive categories, folklore, and anecdotes concerning all aspects of growing up to illuminate the world of children in the village of Deh Koh. The book describes how…

  19. Lessons in Pop: Does Pop Culture Belong in the Classroom?

    ERIC Educational Resources Information Center

    Adams, Caralee

    2011-01-01

    Many teachers are finding that weaving in examples from current movies, television, music, and popular fiction makes their lessons come alive for students. A clip from "The Daily Show" or rap lyrics can be vehicles to talk about politics and poetry. Pop culture is what students talk about in the hallways, so why not harness that interest and…

  20. Expanding Expectations for Narrative Styles in the Context of Dementia

    ERIC Educational Resources Information Center

    Guendouzi, Jackie; Davis, Boyd H.; Maclagan, Margaret

    2015-01-01

    This article uses discourse analyses to examine the narrative styles produced by 2 women with a diagnosis of dementia. Because of constrained cognitive resources, people with dementia (PWD) often use alternative strategies to weave their stories into conversations. People with dementia have difficulty in initiating and maintaining a canonical…