Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Water Atomization of Barium Fluoride: Calcium Fluoride for Enhanced Flow Characteristics of PS304 Feedstock Powder Blend
Author: Water Atomization of Barium Fluoride
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721567713
Category :
Languages : en
Pages : 36
Book Description
PS304 is a plasma spray deposited solid lubricant coating with feedstock composed of NiCr, Cr2O3, Ag, and BaF2-CaF2 powders. The effects of rounded BaF2-CaF2 particles on the gravity-fed flow characteristics of PS304 feedstock have been investigated. The BaF2-CaF2 powder was fabricated by water atomization using four sets of process parameters. Each of these powders was then characterized by microscopy and classified by screening to obtain 45 to 106 micron particles and added incrementally from 0 to 10 wt% to the other constituents of the PS304 feedstock, namely nichrome, chromia, and silver powders. The relationship between feedstock flow rate, measured with the Hall flowmeter, and concentration of fluorides was found to be linear in each case. The slopes of the lines were between those of the linear relationships previously reported using angular and spherical fluorides and were closer to the relationship predicted using the rule of mixtures. The results offer a fluoride fabrication technique potentially more cost-effective than gas atomization processes or traditional comminution processes. Stanford, Malcolm K. and DellaCorte, Christopher Glenn Research Center NASA/TM-2003-212125-REV-1, NAS 1.15:212125, E-13777-1
Evaporation of Water With Emphasis on Applications and Measurements
Author: Frank E. JonesPublisher: CRC Press
ISBN: 1351080415
Category : Science
Languages : en
Pages : 200
Book Description
The loss of water from lakes, rivers, oceans, vegetation, and the earth, as well as man-made structures such as reservoirs and irrigation conduits, is a major concern of hydrologists and irrigation specialists. This loss, compounded by the lack of usable water in some areas, indicates a need for field and laboratory research that will contribute to the understanding of the processes and parameters that comprise and contribute to evaporation.This book emphasizes the process of the air-water interface and discusses such important topics as evaporation and condensation coefficients of water, heat and mass transfer, surface temperature, interfacial tension, convection, diffusion, thermal gradients, wind-generated waves, and the roles that these processes play in evaporation. The book also discusses subjects such as methods for suppressing evaporation using films, water vapor distribution, wind tunnel investigations, evaporation from water drops, preparation of pure water, molecular diffusion, the eddy-correlation method, and evaporation estimation methods. The book will be of considerable value to hydrologists, irrigation specialists, meteorologists, civil engineers, chemical engineers, hydraulic engineers, water resources specialists, water conservation specialists, geophysicists, environmental engineers, and anyone interested in understanding the evaporation of water and its consequences.
NASA Tech Briefs
Author: A-level Chemistry Challenging Practice Questions (Yellowreef)
Author: Thomas BondPublisher: Yellowreef Limited
ISBN: 079780160X
Category : Science
Languages : en
Pages : 255
Book Description
• actual GCE exam question-types • must-have critical resource for students and tutors • all trick question-types since 1997 covered • answer keys provided • Complete edition and concise edition eBooks available
Undergraduate Instrumental Analysis
Author: Thomas J. BrunoPublisher: CRC Press
ISBN: 1000845753
Category : Science
Languages : en
Pages : 1027
Book Description
Analytical instrumentation is crucial to research in molecular biology, medicine, geology, food science, materials science, forensics, and many other fields. Undergraduate Instrumental Analysis, 8th Edition, provides the reader with an understanding of all major instrumental analyses, and is unique in that it starts with the fundamental principles, and then develops the level of sophistication that is needed to make each method a workable tool for the student. Each chapter includes a discussion of the fundamental principles underlying each technique, detailed descriptions of the instrumentation, and a large number of applications. Each chapter includes an updated bibliography and problems, and most chapters have suggested experiments appropriate to the technique. This edition has been completely updated, revised, and expanded. The order of presentation has been changed from the 7th edition in that after the introduction to spectroscopy, UV-Vis is discussed. This order is more in keeping with the preference of most instructors. Naturally, once the fundamentals are introduced, instructors are free to change the order of presentation. Mathematics beyond algebra is kept to a minimum, but for the interested student, in this edition we provide an expanded discussion of measurement uncertainty that uses elementary calculus (although a formula approach can be used with no loss of context). Unique among all instrumental analysis texts we explicitly discuss safety, up front in Chapter 2. The presentation intentionally avoids a finger-wagging, thou-shalt-not approach in favor of a how-to discussion of good laboratory and industrial practice. It is focused on hazards (and remedies) that might be encountered in the use of instrumentation. Among the new topics introduced in this edition are: • Photoacoustic spectroscopy. • Cryogenic NMR probes and actively shielded magnets. • The nature of mixtures (in the context of separations). • Troubleshooting and leaks in high vacuum systems such as mass spectrometers. • Instrumentation laboratory safety. • Standard reference materials and standard reference data. In addition, the authors have included many instrument manufacturer’s websites, which contain extensive resources. We have also included many government websites and a discussion of resources available from National Measurement Laboratories in all industrialized countries. Students are introduced to standard methods and protocols developed by regulatory agencies and consensus standards organizations in this context as well.
Physics Briefs
Author: Scientific and Technical Aerospace Reports
Author: Nuclear Science Abstracts
Author: Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1108
Book Description
NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.
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