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  • Other Sources  (107)
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  • Books  (4)
  • Articles  (1,995)
  • Other Sources  (107)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Weather influences : an empirical study of the mental and physiological effects of definite meteorological conditions (1904)
    New York [u.a.] : Macmillan
    Details Availability
    Call number: MOP 3805
    Type of Medium: Monograph available for loan
    Pages: XXXI, 286 S.
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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    BOOK
    Link to Library Catalog
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  • 2
    Unknown
    Teaching Mineralogy (2011)
    Chantilly, VA : Mineralogical Society of America
    Details
    Description / Table of Contents: This book is an outgrowth of a workshop on teaching mineralogy held at Smith College in June 1996 and sponsored by a grant from the Division of Undergraduate Education, National Science Foundation (DUE-9554635). Seventy participants, from diverse institutional settings and from all academic ranks, met to explore common interests in improving instruction in mineralogy. At the workshop, participants took part as both instructors and as students. They had the opportunity to explore a variety of new instructional methods and materials and also to observe their colleagues as instructors. All were encouraged to test these activities in their own classrooms, to evaluate their effectiveness, to suggest changes to the authors, and to develop new and complementary exercises. The sourcebook before you is the product of this group effort. Within this volume you will find numerous exercises that can be applied in the teaching of mineralogy and related courses. There are hands-on, experimental, theoretical, and analytical exercises. All have been written with the hope of optimizing student learning. At the workshop there was little interest in developing a "prescriptive" approach to mineralogy by making recommendations on a specific content that might be universally applied in mineralogy courses and curricula. We recognize that every student population will have different needs, every faculty vi member will have her or his own areas expertise, every department will have its own curricular needs, every institution will have its own resources, and every geographic setting will provide unique educational opportunities. The exercises in this volume provide examples of innovative ways that mineralogy can be taught using a variety of materials and teaching techniques. We encourage you to use these activities in whatever ways will best serve your students. You may freely photocopy the exercises for class use, adopt these materials or adapt them to meet the special needs of your own course, and use these activities as models to help you develop your own new exercises.
    Pages: Online-Ressource (VIII, 406 Seiten)
    ISBN: 9780939950447
    URL: http://www.minsocam.org/msa/Monographs/mono03.html
    Language: English
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    E-BOOK
  • 3
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    The Mind of a Poet (2022)
    Johns Hopkins University Press
    Details
    Publication Date: 2024-03-26
    Description: Originally published in 1941. This book stresses the transcendental, rather than purely aesthetic, qualities of William Wordsworth's work. It argues that the unusual aspects of Wordsworth's mind are not isolated and did not seem to him fanciful or merely personal; they were, for him, so many paths, difficult to find and harder to follow, yet leading to the great central truth that is the goal of all humankind's loftier strivings.
    Keywords: Literature: history & criticism ; thema EDItEUR::D Biography, Literature and Literary studies::D Biography, Literature and Literary studies::DS Literature: history and criticism
    Language: English
    Format: image/jpeg
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    E-BOOK
  • 4
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    The Mind of a Poet (2022)
    Johns Hopkins University Press
    Details
    Publication Date: 2024-03-26
    Description: This book seeks to study the mind of a poet, specifically by picking William Wordsworth as a case study. The reason for signaling out Wordsworth as the person in whom to study the mind of a poet is that The Prelude reveals with unusual fullness a mind that is fundamentally poetic. Even its peculiarities, its numerous limitations, and its unusual emphases are in the main those of a poet. Besides, poetry—not, as with many other writers, religious or social problems, humanitarianism, science, politics, economics, metaphysics, or literary criticism—was the chief concern of his creative years. Further, the sheer amount of verse, criticism, letters, and journals Wordsworth produced makes him an excellent choice for a study of this kind.
    Keywords: Literature: history & criticism ; thema EDItEUR::D Biography, Literature and Literary studies::D Biography, Literature and Literary studies::DS Literature: history and criticism
    Language: English
    Format: image/jpeg
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    E-BOOK
  • 5
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    New materials drive high-performance aircraft (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This report shows how advanced composite materials and new processing methods are enabling lighter, lower cost aircraft structures. High-temperature polymers research will focus on systems capable of 50,000 to 100,000 hours of operation in the 212-400 F temperature range. Prospective materials being evaluated include high-temperature epoxies, toughened bismaleimides, cyanates, thermoplastics, polyimides and other polymers.
    Keywords: COMPOSITE MATERIALS
    Type: Aerospace America (ISSN 0740-722X); 30; 9, Se
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Characterization of multiaxial warp knit composites (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The objectives were to characterize the mechanical behavior and damage tolerance of two multiaxial warp knit fabrics to determine the acceptability of these fabrics for high performance composite applications. The tests performed included compression, tension, open hole compression, compression after impact and compression-compression fatigue. Tests were performed on as-fabricated fabrics and on multi-layer fabrics that were stitched together with either carbon or Kevlar stitching yarn. Results of processing studies for vacuum impregnation with Hercules 3501-6 epoxy resin and pressure impregnation with Dow Tactix 138/H41 epoxy resin and British Petroleum BP E905L epoxy resin are presented.
    Keywords: COMPOSITE MATERIALS
    Type: First NASA Advanced Composites Technology Conference, Part 2; p 589-619
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Resin transfer molding of textile preforms for aircraft structural applications (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The NASA LaRC is conducting and supporting research to develop cost-effective fabrication methods that are applicable to primary composite aircraft structures. One of the most promising fabrication methods that has evolved is resin transfer molding (RTM) of dry textile material forms. RTM has been used for many years for secondary structures, but has received increased emphasis because it is an excellent method for applying resin to damage-tolerant textile preforms at low cost. Textile preforms based on processes such as weaving, braiding, knitting, stitching, and combinations of these have been shown to offer significant improvements in damage tolerance compared to laminated tape composites. The use of low-cost resins combined with textile preforms could provide a major breakthrough in achieving cost-effective composite aircraft structures. RTM uses resin in its lowest cost form, and storage and spoilage costs are minimal. Near net shape textile preforms are expected to be cost-effective because automated machines can be used to produce the preforms, post-cure operations such as machining and fastening are minimized, and material scrap rate may be reduced in comparison with traditional prepreg molding. The purpose of this paper is to discuss experimental and analytical techniques that are under development at NASA Langley to aid the engineer in developing RTM processes for airframe structural elements. Included are experimental techniques to characterize preform and resin behavior and analytical methods that were developed to predict resin flow and cure kinetics.
    Keywords: COMPOSITE MATERIALS
    Type: FAA, Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design, Volume 3; p 1303-1315
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    RTM: Cost-effective processing of composite structures (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Resin transfer molding (RTM) is a promising method for cost effective fabrication of high strength, low weight composite structures from textile preforms. In this process, dry fibers are placed in a mold, resin is introduced either by vacuum infusion or pressure, and the part is cured. RTM has been used in many industries, including automotive, recreation, and aerospace. Each of the industries has different requirements of material strength, weight, reliability, environmental resistance, cost, and production rate. These requirements drive the selection of fibers and resins, fiber volume fractions, fiber orientations, mold design, and processing equipment. Research is made into applying RTM to primary aircraft structures which require high strength and stiffness at low density. The material requirements are discussed of various industries, along with methods of orienting and distributing fibers, mold configurations, and processing parameters. Processing and material parameters such as resin viscosity, perform compaction and permeability, and tool design concepts are discussed. Experimental methods to measure preform compaction and permeability are presented.
    Keywords: COMPOSITE MATERIALS
    Type: NASA, Washington, Technology 2001: The Second National Technology Transfer Conference and Exposition, Volume 2; p 12-21
    Format: application/pdf
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  • 9
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    Performance of resin transfer molded multiaxial warp knit composites (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Composite materials that are subjected to complex loads have traditionally been fabricated with multidirectionally oriented prepreg tape materials. Some of the problems associated with this type of construction include low delamination resistance, poor out-of-plane strength, and labor intensive fabrication processes. Textile reinforced composites with through-the-thickness reinforcement have the potential to solve some of these problems. Recently, a relatively new class of noncrimp fabrics designated as multiaxial warp knits have been developed to minimize some of the high cost and damage tolerance concerns. Multiple stacks of warp knit fabrics can be knitted or stitched together to reduce layup labor cost. The through-the-thickness reinforcement can provide significant improvements in damage tolerance and out-of-plane strength. Multilayer knitted/stitched preforms, in conjunction with resin transfer molding (RTM), offer potential for significant cost savings in fabrication of primary aircraft structures. The objectives of this investigation were to conduct RTM processing studies and to characterize the mechanical behavior of composites reinforced with three multiaxial warp knit fabrics. The three fabrics investigated were produced by Hexcel and Milliken in the United States, and Saerbeck in Germany. Two resin systems, British Petroleum E9O5L and 3M PR 500, were characterized for RTM processing. The performance of Hexcel and Milliken quasi-isotropic knitted fabrics are compared to conventional prepreg tape laminates. The performance of the Saerbeck fabric is compared to uniweave wing skin layups being investigated by Douglas Aircraft Company in the NASA Advanced Composites Technology (ACT) program. Tests conducted include tension, open hole tension, compression, open hole compression, and compression after impact. The effects of fabric defects, such as misaligned fibers and gaps between tows, on material performance are also discussed. Estimated material and labor cost savings are projected for the Saerbeck fabric as compared to uniweave fabric currently being used by Douglas in the NASA ACT wing development program.
    Keywords: COMPOSITE MATERIALS
    Type: Third NASA Advanced Composites Technology Conference, Volume 1, Part 1; p 231-261
    Format: application/pdf
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  • 10
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    Recent progress in NASA Langley textile reinforced composites program (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The NASA LaRC is conducting and sponsoring research to explore the benefits of textile reinforced composites for civil transport aircraft primary structures. The objective of this program is to develop and demonstrate the potential of affordable textile reinforced composite materials to meet design properties and damage tolerance requirements of advanced aircraft structural concepts. In addition to in-house research, the program was recently expanded to include major participation by the aircraft industry and aerospace textile companies. The major program elements include development of textile preforms, processing science, mechanics of materials, experimental characterization of materials, and development and evaluation of textile reinforced composite structural elements and subcomponents. The NASA Langley in-house focus is as follows: development of a science-based understanding of resin transfer molding (RTM), development of powder-coated towpreg processes, analysis methodology, and development of a performance database on textile reinforced composites. The focus of the textile industry participation is on development of multidirectional, damage-tolerant preforms, and the aircraft industry participation is in the areas of design, fabrication and testing of textile reinforced composite structural elements and subcomponents. Textile processes such as 3D weaving, 2D and 3D braiding, and knitting/stitching are being compared with conventional laminated tape processes for improved damage tolerance. Through-the-thickness reinforcements offer significant damage tolerance improvements. However, these gains must be weighed against potential loss in in-plane properties such as strength and stiffness. Analytical trade studies are underway to establish design guidelines for the application of textile material forms to meet specific loading requirements. Fabrication and testing of large structural components are required to establish the full potential of textile reinforced composite materials.
    Keywords: COMPOSITE MATERIALS
    Type: FAA, Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design, Volume 2; p 845-87
    Format: application/pdf
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