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  • 1
    Publication Date: 2013-08-31
    Description: Experimental evaluation of selected encapsulation designs and materials based on an earlier study which have potential for use in low cost, long-life photovoltaic arrays are reported. The performance of candidate materials and encapsulated cells were evaluated principally for three types of encapsulation designs based on their potentially low materials and processing costs: (1) polymeric coatings, transparent conformal coatings over the cell with a structural-support substrate; (2) polymeric film lamination, cells laminated between two films or sheets of polymeric materials; and (3) glass-covered systems, cells adhesively bonded to a glass cover (superstrate) with a polymeric pottant and a glass or other substrate material. Several other design types, including those utilizing polymer sheet and pottant materials, were also included in the investigation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: DOE/JPL-954328-78/2 , NASA-CR-157758
    Format: application/pdf
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  • 2
    Publication Date: 2017-06-27
    Description: Packaging and preservation of space vehicle hardware
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-87419
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: Three encapsulation designs for silicon photovoltaic arrays based on cells with silk-screened Ag metallization have been evaluated: transparent polymeric coatings over cells laminated between two films or sheets of polymeric materials; cells adhesively bonded to a glass cover with a polymer pottant and a glass or other substrate component. Silicone and acrylic coatings were assessed, together with acrylic sheet, 0.635 mm fiberglass-reinforced polyester sheet, 0.102 mm polycarbonate/acrylic dual-layer film, 0.127 mm fluorocarbon film, soda-lime glass, borosilicate glass, low-iron glass, and several adhesives. The encapsulation materials were characterized by light transmittance measurements, determination of moisture barrier properties and bond strengths, and by the performance of cells before and after encapsulation. Silicon and acrylic coatings provided inadequate protection. Acrylic and fluorocarbon films displayed good weatherability and acceptable optical transmittance. Borosilicate, low-iron and soda-lime-float glasses were found to be acceptable candidate encapsulants for most environments.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; June 5-8, 1978; Washington, DC
    Format: text
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  • 4
    Publication Date: 2019-07-13
    Description: Using time-resolved optical spectroscopy and UBVRI and high-speed photometry obtained at Mount Stromlo Observatory, Mount John University Observatory, and the South African Astronomical Observatory; International Ultraviolet Explorer (IUE) ultraviolet spectroscopy; and Roentgen Satellite (ROSAT) survey X-ray fluxes, we present a study of the accretion disk, hot spot, and emission line regions in the bright eclipsing nova-like variable V347 Pup (LB 1800). In the optical and UV, V347 Pup is a strong emission line source with a continuum spectrum which is remarkably red for a high-M cataclysmic variable. Consistent with its high inclination, we interpret the continuum spectrum as the superposition of the spectrum of the cool (T(sub eff) approximately 7000 K) outer edge and the hot (T(sub eff) approximately 100,000 K) inner regions of a self-eclipsed accretion disk. For the assumed parameters, the model matches the level and shape of the observed spectrum for an inclination of approximately 88 and a distance of approximately 300 pc. The prominent hump in the optical and UV light curves just before eclipse manifests the presence of the hot spot where the accretion stream strikes the edge of the disk. The wavelength dependence of the amplitude of the hump is best modeled by a spot having an effective temperature of approximately 25,000 K and an area of approximately 3 x 10(exp 18) sq cm if the spot radiates like a blackbody, or an effective temperatue of approximately 14,000 K and an area of approximately 3 x 10(exp 19) sq cm if it radiates with a stellar spectrum. In either case, the hot spot produces only one-tenth of the predicted luminosity for the assumed mass-transfer rate of 10(exp -8) solar mass/yr. Either the hot spot is 'buried' in the edge of the accretion disk, or a significant fraction of its luminosity is radiated away in lines. The difference in azimuth between the peak of the hump and the dynamically expected location of the hot spot suggests that the spot's emitting surface is rotated forward by approximately 36 deg relative to the edge of the disk.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 424; 1; p. 347-369
    Format: text
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  • 5
    Publication Date: 2017-01-25
    Description: Global occurrence and heterogeneity of the Roseobacter-clade species Ruegeria mobilis The ISME Journal 11, 588 (February 2017). doi:10.1038/ismej.2016.125 Authors: Eva C Sonnenschein, Kristian F Nielsen, Paul D'Alvise, Cisse H Porsby, Jette Melchiorsen, Jens Heilmann, Panos G Kalatzis, Mario López-Pérez, Boyke Bunk, Cathrin Spröer, Mathias Middelboe & Lone Gram
    Print ISSN: 1751-7362
    Electronic ISSN: 1751-7370
    Topics: Biology
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  • 6
    Publication Date: 2016-11-29
    Description: Characterization of the first cultured representative of Verrucomicrobia subdivision 5 indicates the proposal of a novel phylum The ISME Journal 10, 2801 (December 2016). doi:10.1038/ismej.2016.84 Authors: Stefan Spring, Boyke Bunk, Cathrin Spröer, Peter Schumann, Manfred Rohde, Brian J Tindall & Hans-Peter Klenk
    Print ISSN: 1751-7362
    Electronic ISSN: 1751-7370
    Topics: Biology
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  • 7
    Publication Date: 2016-05-27
    Description: Whole exome sequencing (WES) has been proven to serve as a valuable basis for various applications such as variant calling and copy number variation (CNV) analyses. For those analyses the read coverage should ...
    Electronic ISSN: 1471-2164
    Topics: Biology
    Published by BioMed Central
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  • 8
    Publication Date: 2015-11-20
    Description: The mechanical properties of many materials are based on the macroscopic arrangement and orientation of their nanostructure. This nanostructure can be ordered over a range of length scales. In biology, the principle of hierarchical ordering is often used to maximize functionality, such as strength and robustness of the material, while minimizing weight and energy cost. Methods for nanoscale imaging provide direct visual access to the ultrastructure (nanoscale structure that is too small to be imaged using light microscopy), but the field of view is limited and does not easily allow a full correlative study of changes in the ultrastructure over a macroscopic sample. Other methods of probing ultrastructure ordering, such as small-angle scattering of X-rays or neutrons, can be applied to macroscopic samples; however, these scattering methods remain constrained to two-dimensional specimens or to isotropically oriented ultrastructures. These constraints limit the use of these methods for studying nanostructures with more complex orientation patterns, which are abundant in nature and materials science. Here, we introduce an imaging method that combines small-angle scattering with tensor tomography to probe nanoscale structures in three-dimensional macroscopic samples in a non-destructive way. We demonstrate the method by measuring the main orientation and the degree of orientation of nanoscale mineralized collagen fibrils in a human trabecula bone sample with a spatial resolution of 25 micrometres. Symmetries within the sample, such as the cylindrical symmetry commonly observed for mineralized collagen fibrils in bone, allow for tractable sampling requirements and numerical efficiency. Small-angle scattering tensor tomography is applicable to both biological and materials science specimens, and may be useful for understanding and characterizing smart or bio-inspired materials. Moreover, because the method is non-destructive, it is appropriate for in situ measurements and allows, for example, the role of ultrastructure in the mechanical response of a biological tissue or manufactured material to be studied.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liebi, Marianne -- Georgiadis, Marios -- Menzel, Andreas -- Schneider, Philipp -- Kohlbrecher, Joachim -- Bunk, Oliver -- Guizar-Sicairos, Manuel -- England -- Nature. 2015 Nov 19;527(7578):349-52. doi: 10.1038/nature16056.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Paul Scherrer Institut, 5232 Villigen PSI, Switzerland. ; Institute for Biomechanics, ETH Zurich, 8093 Zurich, Switzerland. ; Bioengineering Science Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26581291" target="_blank"〉PubMed〈/a〉
    Keywords: Aged ; Collagen/ultrastructure ; Humans ; Imaging, Three-Dimensional/methods ; Male ; Nanostructures/*ultrastructure ; *Scattering, Small Angle ; Spine/ultrastructure ; Tomography/*methods ; X-Ray Diffraction
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2008-07-19
    Description: Coherent diffractive imaging (CDI) and scanning transmission x-ray microscopy (STXM) are two popular microscopy techniques that have evolved quite independently. CDI promises to reach resolutions below 10 nanometers, but the reconstruction procedures put stringent requirements on data quality and sample preparation. In contrast, STXM features straightforward data analysis, but its resolution is limited by the spot size on the specimen. We demonstrate a ptychographic imaging method that bridges the gap between CDI and STXM by measuring complete diffraction patterns at each point of a STXM scan. The high penetration power of x-rays in combination with the high spatial resolution will allow investigation of a wide range of complex mesoscopic life and material science specimens, such as embedded semiconductor devices or cellular networks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thibault, Pierre -- Dierolf, Martin -- Menzel, Andreas -- Bunk, Oliver -- David, Christian -- Pfeiffer, Franz -- New York, N.Y. -- Science. 2008 Jul 18;321(5887):379-82. doi: 10.1126/science.1158573.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Paul Scherrer Institut, 5232 Villigen PSI, Switzerland. pierre.thibault@psi.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18635796" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Fourier Analysis ; Image Processing, Computer-Assisted ; Microscopy/instrumentation/*methods ; Nanostructures/*ultrastructure ; Scattering, Small Angle ; *X-Ray Diffraction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2016-01-07
    Description: Bac Dive –the Bacterial Diversity Metadatabase ( http://bacdive.dsmz.de ) provides strain-linked information about bacterial and archaeal biodiversity. The range of data encompasses taxonomy, morphology, physiology, sampling and concomitant environmental conditions as well as molecular biology. The majority of data is manually annotated and curated. Currently (with release 9/2015), Bac Dive covers 53 978 strains. Newly implemented RESTful web services provide instant access to the content in machine-readable XML and JSON format. Besides an overall increase of data content, Bac Dive offers new data fields and features, e.g. the search for gene names, plasmids or 16S rRNA in the advanced search , as well as improved linkage of entries to external life science web resources.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
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