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Showing 1 to 20 of 41 for “"LARC"”.
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Crystallization and melting behavior of an aromatic semicrystalline polyimide, LaRC CPI-2
… an aromatic semi crystalline polyimide known as LaRC CPI - 2 (Langley Research Center Crystalline rolyimide - second generation). This aromatic polyimide, a structural variant of the well known LaRC CPI, is synthesized froml 1,4-bis( 4-aminophenoxy-4' -benzoyl)benzene (1,4-BABB) and 4,4' …
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The fabrication of carbon-fiber composites by aqueous suspension prepregging with larc-tpi and peek
… Two thermoplastic polymers were studied : LaRC-TPI, provided by Mitsui Toatsu Chemicals, and Poly(etheretherketone), synthesized in Virginia Tech Chemistry Department. Comparison of LaRC-TPI composites to those made at NASA-Langley Research Center demonstrated good reproducibility of the …
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Crystallization behavior and morphological features of two LARC polyimides and local orientation studies of two semicrystalline model composites
… morphological features of two polyimides, namely LARCCPI (Langley Research .Center Crystalline folyimide) and LARC-TPI (Thermoplastic folyimide). The LARC-CPI study first considered feature~ affecting crystallization behavior including inherent viscosity, crystallization temperature, and melt …
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National Practices, Attitudes, and Training Surrounding Long-Acting Reversible Contraception Procedures for Adolescents
… administer long-acting reversible contraception (LARC), a highly effective form of contraception. Medically- and socially- complex patients access to contraception is additionally limited, as they often receive much of their medical care in the hospital setting. Training pediatricians and …
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Solvent induced microcracking in high performance polymeric composites
… dye penetrant. The material systems were IM7/LaRC™-IAX, IM7/LaRC™-IAX2, and IM7/LaRC™-8515. Specimens from each material system were subjected to one of three immersion tests. The first immersion test involved soaking composite specimens previously prepared with different polishing techniques …
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Experimental and computational techniques in carbon-13 NMR
… were used in an investigation of the polyimides LaRC-IA, LaRC-TPI and LaRC-SI and related model compounds. Magic angle spinning was used to acquire 13C isotropic chemical shift spectra of these materials. The spectra were assigned as completely as possible. In addition, the principal components …
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Understanding factors affecting utilization of Long-Term Reversible Contraception in rural Pakistan
… low-cost availability, less than 3% of women use LARCs in Pakistan. Following a cross-sectional survey, an explanatory mixed methods design was used to examine influence of social networks, spousal communication and social norms on use of LARC in rural Islamabad. The first study used a cross …
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Creating Recommendations for Long Acting Reversible Contraceptive Use for Adolescents
… to include long acting reversible contraceptive (LARC) recommendations for the adolescent population. LARCs, which include intrauterine devices and implants, are the top-tier contraceptive for nulliparous women yet they are only used in less than 6% of women under 19 years old. There is no LARC …
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Fertility Desires and Fertility Control: Young Women's Contraceptive decision-making in Khayelitsha, South Africa
… of long-acting reversible contraceptive (LARC) methods. However, young women's response to LARC methods has been characterized by low and declining uptake and early removals. A tension exists between the way public health practitioners imagine meeting the contraceptive needs of young women …
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Optical and Thermal Radiative Simulation of an Earth Radiation Budget Instrument
Researchers at the NASA Langley Research Center (LaRC) are developing a next-generation instrument for monitoring the Earth radiation budget (ERB) from low Earth orbit. This instrument is called the DEMonstrating the Emerging Technology for measuring the Earth's Radiation (DEMETER) instrument. …
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The effects of polymeric binders on the processability and properties of composites made by suspension prepregging
… of 250 % on the complex dynamic viscosity of LaRC TPI matrix was measured upon the addition of 21.3 wt% of imidized LaRC TPI polyamic acid binder at a frequency of 1 Hz. The greatest fiber-matrix adhesion was observed for PEEK composites when BisP BTDA polyamic acid was used as a binder. A …
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Understanding health workers’ views on addressing the unmet need for family planning in Guadalcanal, Solomon Islands
… on Long-Acting Reversible Contraception (LARC) in their communities. Fifty-six surveys comprised of 32 open-ended and closed-ended questions were completed and analysed. Results: Health workers identified multiple structural, social, and service-driven barriers to meeting the contraceptive …
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An Evaluation of POS Taggers for the CHILDES Corpus
… have been manually labeled, and rewrote with LARC tagset. They served as gold standard corpora in the training and testing process. Four taggers: CLAN MOR tagger, ACOPOST trigram tagger, Stanford parser, and Ver. 1.14 of Brill tagger have been tested by 10-fold cross validation. By analyzing …
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Effects of stress on material properties, intrinsic and extrinsic behavior, and electromechanical response of stress-biased actuators
… bonded together with a thermoplastic material (LaRC-SI). On cooling from the processing temperature, the difference in thermal expansion between layers creates a unique dome structure with high internal stress. Thunder™ actuators were studied to provide insight into the fundamental effects of …
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Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds
… acid) adherends. Samples were bonded with LaRC-IA adhesive in a wedge test geometry. Environmental testing consisted of static and cyclical exposure for 240 hours in three atmospheres: 1) 170°C, 2 torr; 2) -20°C; 3) 60°C, 70% relative humidity. Crack propagation arrested within 48 hours. …
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Identificación de biomarcadores pronósticos y predictivos en cáncer de recto localmente avanzado tratado con quimiorradioterapia neoadyuvante
… del cáncer de recto localmente avanzado (LARC) se encuentra la quimiorradioterapia (QRT) neoadyuvante seguida de cirugía basada en la extirpación total del mesorrecto. Esta estrategia ha demostrado mejorar los resultados en comparación con la QRT adyuvante, aunque no se han observado …
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Surface characterization and adhesion of plasma-modified polyimides
LaRC-TPI, an aromatic thermoplastic polyimide, and Kapton®, a poly(pyromellitimide) were exposed to oxygen, argon and ammonia plasmas as pretreatments for adhesive bonding. Chemical changes which occurred in the surface as a result of the plasma treatments were investigated using x-ray …
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Quantification of the boundary layer ingestion benet for the D8-series aircraft using a pressure rake system
… carried out at NASA Langley Research Center (LaRC) 14'x22' Subsonic Wind Tunnel to determine the aerodynamic boundary layer ingestion (BLI) benet for the D8 aircraft advanced transport concept. The experiments involved a back-to-back comparison between two D8 aircraft configurations: a podded …
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Experimental design for the evaluation of high-Tc superconductive thermal bridges in a sensor satellite
… Administration's Langley Research Center (NASA-LaRC) are evaluating the effectiveness of replacing the currently used manganin wires with high-temperature superconductive (HTS) materials as the electrical connections (thermal bridges). In conjunction with the study being conducted at NASALaRC, …
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