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Topic Area: Environment/Climate

Displaying records 291 to 300 of 421 records.
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291. Lipid Accumulation and Fatty Acid Composition During Maturation of Three Pelagic Fish Species in Lake Baikal
Topic: Environment/Climate
Published: 3/1/1998
Authors: S Ju, John R Kucklick, T Koslova, H R Harvey

292. NIST Methods for the Certification of SRM 1941a, Organics in Marine Sediment, and SRM 1974a, Organics in Mussel Tissue (Mytilus edulis)
Topic: Environment/Climate
Published: 3/1/1998
Authors: Michele M Schantz, Bruce A Benner Jr, M K. Donais, M. J. Hays, William R. Kelly, Reenie M. Parris, Barbara J. Porter, Dianne L Poster, Lane C Sander, Katherine E Sharpless, Robert D Vocke Jr, Stephen A Wise, M Levenson, Susannah B. Schiller, M Vangel
Abstract: The replacement Standard Reference Materials [SRM 1941, Organics in Marine Sediment, and SRM 1974, Organics in Muscle Tissue [Mytilus edulis], have been prepared and analyzed for the determination of trace organic constituents. SRM 1941a has been is ...

293. Experiences in the Grinding of Silicon Nitride on a Lower Cost High Speed CNC Grinder
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6079
Topic: Environment/Climate
Published: 1/16/1998
Authors: T W. Hwang, Eric Paul Whitenton, Christopher J. Evans
Abstract: An investigation into high speed grinding of ceramics has been conducted to understand machine dynamics, wheel wear, and ground surface morphology. Some preliminary results are reported for modal testing and wheel wear together with microscopic obser ...

294. Ductile-Regime Grinding of Brittle Materials
Topic: Environment/Climate
Published: 1/1/1998
Authors: Kenneth Blaedel, Christopher J. Evans, John S Taylor

295. Dynamic Problems in Hard Turning, Milling and Grinding
Topic: Environment/Climate
Published: 1/1/1998
Author: Matthew A. Davies
Abstract: In this chapter we examine the application of nonlinear dynamics to various problems in manufacturing. We focus on three practical machining processes currently receiving significant industrial attention: turning of hardened steels (hard-turning), hi ...

296. Frequency Domain Modal Estimation Techniques, Experimental Techniques
Topic: Environment/Climate
Published: 1/1/1998
Authors: S Fahey, Jon Robert Pratt
Abstract: In this brief, we discuss the estimation of modal parame-ters using single-degree-of-freedom approximations. Then, we proceed to review two multi-degree-of- freedom techniques for modal parameter estimations-the first based on dynamic matrices and th ...

297. On the dynamics of high-speed milling with long slender endmills
Topic: Environment/Climate
Published: 1/1/1998
Authors: Matthew A. Davies, A Schaut, Jon Robert Pratt, Brian S. Dutterer
Abstract: Tool deflections of high length-to-diameter ratio endmills are measured with capacitance probes during high-speed milling and compared with the predictions of regenerative chatter theory. Poincar? sectioning (once per revolution sampling) techniques ...

298. Process Effects on White Layer Formation in Hard Turning
Topic: Environment/Climate
Published: 1/1/1998
Authors: Y K Chou, Christopher J. Evans
Abstract: This paper discusses surface microstructural alterations in hard turned steels. A metallurgically unetchable structure, called white layer?, followed by a dark etching layer has been found on AISI 52100 steel surfaces machined in a hardened state (60 ...

299. Time Domain Modal Estimation
Topic: Environment/Climate
Published: 1/1/1998
Authors: S Fahey, Jon Robert Pratt
Abstract: In a previous technical feature,2 we described some motives for performing structural dynamic tests and subsequently reviewed some frequency domain techniques for uncovering modal parameters. This time, we take up some applicable time domain algorith ...

300. Ultrasonic Detection of Unstable Plastic Flow in Hard Metal Cutting
Topic: Environment/Climate
Published: 1/1/1998
Authors: Matthew A. Davies, Gerald V. Blessing, Christopher J. Evans, Steven Earl Fick

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