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Publisher’s Note: “Polymer-specific effects of bulk relaxation and stringlike correlated motion in the dynamics of a supercooled polymer melt” [J. Chem. Phys. 119, 5290 (2003)]

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The Journal of Chemical Physics 2004年第14期120卷 6798-6798页

作者： M. Aichele Y. Gebremichael F. W. Starr J. Baschnagel S. C. Glotzer Institut Charles Sadron 6 rue Boussingault 67083 Strasbourg France Institut für Physik Johannes Gutenberg-Universität 55099 Mainz Germany Department of Chemical Engineering University of Michigan Ann Arbor Michigan 48109 Chemical Physics Program Institute for Physical Sciences and Technology University of Maryland College Park Maryland 20742 Center for Theoretical and Computational Materials Science and Polymers Division National Institute of Standards and Technology Gaithersburg Maryland 20899 Departments of Chemical Engineering and Materials Science and Engineering University of Michigan Ann Arbor Michigan 48109

M. Aichele, Y. Gebremichael, F. W. Starr, J. Baschnagel, S. C. Glotzer; Publisher’s Note: “Polymer-specific effects of bulk relaxation and stringlike correlated

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Effect of coolant injection to small-scale diffuser simulating SSME testing conditions

Effect of coolant injection to small-scale diffuser simulati...

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38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2002

作者： Cho, Christopher S. Gerald, A. Pitalo Dept. of Mechanical and Aeronautical Engineering Western Michigan University Kalamazoo MI 49008 United States Physical Science Division NASA Headquarters Washington D.C. 20024 United States

ISBN: (纸本)9781624101151

One-dimensional and two-dimensional analyses of the small-scale diffuser are performed. Based on the 1-D analysis, a diffuser diameter is chosen to be 6 inches considering the diffuser startup pressure and the high altitude static pressure. The gas-side diffuser wall temperatures are obtained from the 2-D numerical calculation using FLUENT, and the results are compared qualitatively with the 1-D analytical solution. The static temperature profile shows that the water-vapor layer separates the high combustion gas from the wall;therefore, the diffuser wall is protected from impingement of the high-temperature shock wave. Both the static temperature profile and the mass fraction profile indicate that the ratio between gas and water mass flow rates is important parameter in determining the cooling characteristics. The static temperature profiles indicate that the water vapor stays 10 - 14 inches along the axial direction before being mixed away with the combustion gas. © 2002 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Water vapor

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Generalizing the theory of microdialysis

Generalizing the theory of microdialysis

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作者： Banerjee, Rupak K. Bungay, Peter M. Sarntinoranont, Malisa Chippada, Srinivas Department of Mechanical Engineering University of Cincinnati Cincinnati OH 45221-0072 United States Division of Bioengineering and Physical Science National Institutes of Health Bethesda MD 20892-5766 United States Development Group Fluent Incorporated Evanston IL 60201 United States

ISBN: (纸本)0791836509

The efficiency of sampling or delivering solutes (analytes) by in vivo microdialysis is influenced by the diffusive permeabilities of the probe and the tissue in which the probe is implanted. In tissue, processes removing the analyte from the extracellular space are as important as diffusion in determining permeability. In addition to diffusion, analyte permeation through these media may be augmented or diminished by bulk fluid movement (transmembrane and interstitial convection). Within the perfusate, the dominant process is axial convection. Both diffusive and convective determinants of probe efficiency may be influenced by probe geometry (Figure 1;longitudinal cross-sectional view). The main geometric parameters are the probe membrane length and radii, but inner cannula geometry can also be an appreciable factor. Copyright © 2002 by ASME.

关键词： Probes

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Monitoring the navy's strategic reserve of ozone-depleting substances

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NAVAL ENGINEERS JOURNAL 2002年第4期114卷 95-104页

作者： Smith, DE Breslin, DA Toms, GS Norton, P DENNIS E. SMITH PH.D. is currently a statistical consultant for GEO-CENTERS INC. He received a B.A. in Mathematics (magna cum laude)from Wabash College and an M.S. in mathematics an M.S. in statistics and a Ph.D. in statistics from the University of Wisconsin. From November 1973 until February 1999 he was president and principal statistician at Desmatics Inc. where he participated in a number of studies involving the application of statistical methods to various technical problems in the Navy's environmental-protection and auxiliary-machinery programs. Dr. Smith was instrumental in developing the statistical procedures underlying the Navy's ODS reserve monitoring plan. DAVID A. BRESLIN P.E. is the director of technical operations for the Naval Surface Warfare Center and chairs the ASNE/SNAME Joint Committee on Environmental Engineering. He received a master of science in aerospace engineering from Virginia Tech a master of engineering administration in industrial and systems engineering from Virginia Tech and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC and Halon Elimination Program and played a critical role in establishing the Navy's strategic reserve of ozone-depleting substances. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recognition of “exceptional contributions to global environmental protection”. GREGORY S. TOMS P.E. is the CFC &Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center)where he worked on the development of advanced cent

The domestic production of the most powerful ozone-depleting substances (ODSs) has permanently ceased and the abundant supplies of a number of refrigerants, fire-fighting agents, and solvents, once taken for granted, are now a thing of the past. The Navy has adopted a successful strategy for addressing the threat posed by the unavailability of ODSs. That strategy includes relying on a strategic reserve of ODSs. Considering that the strategic reserve will play a critical role in sustained Fleet operations into the middle of the century, it is important to record the history of the reserve and to document lessons learned in order to educate future generations that may face similar challenges. This is the third of three papers that cover all aspects of the Navy's strategic reserve of ODSs. Breslin (1999) documented the history of the Navy's effort to size, establish, and monitor a reserve designed to support Fleet operations until the middle of the century. Breslin, Smith, and Toms (2000) addressed in detail the process used to estimate the required size of the reserve, including the survey method, statistical analyses, and sizing algorithms. This paper discusses the Navy's plan for monitoring the Navy's strategic reserves of ODSs and describes the methods used in the monitoring process. In particular it discusses the underlying assumptions and statistical techniques associated with the Navy's prediction of the expected drawdown of the reserves. A comparison of actual data, collected since the strategic reserves began operations in 1995, with the predicted reserve drawdown, is included in the paper.

关键词： Marine engineering

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A statistical method for estimating the life expectancy of certain shipboard equipment

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NAVAL ENGINEERS JOURNAL 2002年第1期114卷 27-32页

作者： Smith, DE Breslin, DA Toms, GS DENNIS E. SMITH PH.D. is a statistical consultant for Geo-Centers Inc. He received a B.A. in mathe-matics (magna cum laude) from Wabash College and an M.S. in mathematics an M.S. in statistics and a Ph.D. in statistics from the University of Wisconsin. From November 1973 until February 1999 he was President and Principal Statistician at Desmatics Inc. where he participated in a number of studies involving the application of statistical methods to various technical problems in the Navy's environmental-protection and auxiliary-machinery programs. Dr. Smith was instrumental in developing the statistical procedures underlying the Navy's ODS reserve monitoring plan. DAVID A. BRESLIN P.E. is the Director of Technical Operations for the Naval Surface Warfare Center and is the chairperson of ASNE's Committee on Environmental Engineering. He received a master of science degree in aerospace engineering from Virginia Tech a master of engineering administration in indus-trial & systems engineering from Virginia Tech and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC & Halon Elimination Program and played a critical role in establishing the Navy's strategic reserve of ozone-depleting substances. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recogni-tion of “exceptional contributions to global environmental protection”. GREGORY S. TOMS P.E. is the CFC & Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center) where he worked on the development of advanced cent

This paper reviews an inexpensive statistical-sampling methodology that can be used to determine the attrition rates of certain types of shipboard equipment. The methodology relies on surveys that are conducted in conjunction with regularly scheduled ship visits over a period of time and a statistical analysis of the survey results. The statistical technique allows for reasonably accurate estimates to be made of attrition rates. The specific example cited in this paper is related to galley-type refrigeration equipment, such as salad chillers, beverage dispensers, et cetera. In the case of galley-type refrigeration equipment, the Navy needs to know whether the Fleet's inventory of equipment relying on Class I Ozone-Depleting Substances (ODSs) will be replaced through natural attrition by the end of fiscal year (FY) 2005, at which time supplies of ODS-based refrigerants will no longer be available for use by ship galleys. This paper outlines the process used to gather data, the analysis of the data, and concludes that the Navy's inventory of galley equipment using Class I ODSs will be replaced through natural attrition by the end of FY05. The methodology reviewed by this paper has wider applications. For various types of shipboard equipment, the methodology can also be used to estimate with reasonable accuracy life expectancies, configurations, conditions, and other items of interest.

关键词： Ship equipment

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ISOCHORIC SPECIFIC HEAT CAPACITY MEASUREMENTS FOR LIQUID ISOBUTANE

ISOCHORIC SPECIFIC HEAT CAPACITY MEASUREMENTS FOR LIQUID ISO...

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第一届亚洲制冷空调大会

作者： Hiroyuki MIYAMOTO Hiroshi KITAJIMA Noboru KAGAWA Joseph W.MAGEE Seizo TSURUNO Koichi WATANABE Faculty of Science and Technology Keio University Kohoku-ku Yokohama 223-8522 Japan Department of Mechanical Systems Engineering National Defense Academy Yokosuka 239-8686 Japan Department of Mechanical Systems Engineering National Defense Academy Yokosuka 239-8686 Japan Physical and Chemical Properties Division National Institute of Standards and Technology Boulder CO 80305-3328 USA Department of Mechanical Systems Engineering National Defense Academy Yokosuka 239-8686 Japan Faculty of Science and Technology Keio University Kohoku-ku Yokohama 223-8522 Japan

Experimental isochoric specific heat capacities（C） and PpT properties for isobutane are presented that were measured with a twin-cell type adiabatic isochoric calorimeter. The measurements were obtained for temperatures from 272 to 408 K and for pressures up to 30 MPa. The sample purity was 99.99 mol%. The expanded uncertainties （i.e. a coverage factor k=2） are 13 mK for temperature, 8 kPa for pressure, 0.16 % for density, and 3.6 % for C in the liquid phase. An evaluation and a comparison of the experimental data with highly reliable equations of state confirmed satisfactorily the thermodynamic consistency of the present measurements.

关键词： Adiabatic Calorimeter Isobutane Isochoric Heat Capacity Measurement Natural Working Fluid Twin-cell Type

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High-speed photographic evaluation of retropulsion momentum induced by a laser calculi lithotriptor

High-speed photographic evaluation of retropulsion momentum ...

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2001 ASME International mechanical engineering Congress and Exposition

作者： Lee, Ho Kim, Jeehyun Choi, Bernard Teichman, Joel M.H. Welch, A.J. Department of Mechanical Engineering University of Texas at Austin Austin TX United States Department of Electrical Engineering University of Texas at Austin Austin TX United States Biomedical Engineering Program University of Texas at Austin Austin TX United States Division of Urology University of Texas Health Science Center San Antonio TX United States

The retropulsive momentum induced by a laser calculi lithotriptor was evaluated by high-speed photography. Calculus phantoms made from plaster of paris were placed in a clear glass tube that served as in vitro model of the ureter. Movement of the calculus was monitored by a high-speed camera which had provided pictures in every 300μsecond. It was found that the recoil momentum proportionally increased with increasing laser energy and larger fiber diameter resulted in higher momentum.

关键词： Laser tissue interaction

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physical Review E 2001年第5期64卷 051503-051503页

作者： Y. Gebremichael T. B. Schrøder F. W. Starr S. C. Glotzer Center for Theoretical and Computational Materials Science and Polymers Division National Institute of Standards and Technology Gaithersburg Maryland 20899 Chemical Physics Program Institute for Physical Sciences and Technology University of Maryland College Park Maryland 20742 Departments of Chemical Engineering and Materials Science and Engineering University of Michigan Ann Arbor Michigan 48109

In recent years, experimental and computational studies have demonstrated that the dynamics of glass-forming liquids are spatially heterogeneous, exhibiting regions of temporarily enhanced or diminished mobility. Here we present a detailed analysis of dynamical heterogeneity in a simulated “bead-spring” model of a low-molecular-weight polymer melt. We investigate the transient nature and size distribution of clusters of “mobile” chain segments (monomers) as the polymer melt is cooled toward its glass transition. We also explore the dependence of this clustering on the way in which the mobile subset is defined. We show that the mean cluster size is time dependent with a peak at intermediate time, and that the mean cluster size at the peak time grows with decreasing temperature T. We show that for each T a particular fraction of particles maximizes the mean cluster size at some characteristic time, and this fraction depends on T. The growing size of the clusters demonstrates the growing range of correlated motion, previously reported for this same system [C. Beneman et al. Nature (London) 399, 246 (1999)]. The distribution of cluster sizes approaches a power law near the mode-coupling temperature, similar to behavior reported for a simulated binary mixture and a dense colloidal suspension, but with a different exponent. We calculate the correlation length of the clusters, and show that it exhibits similar temperature- and time-dependent behavior as the mean cluster size, with a maximum at intermediate time. We show that the characteristic time of the maximum cluster size follows the scaling predicted by mode-coupling theory (MCT) for the β time scale, revealing a possible connection between spatially heterogeneous dynamics and MCT.

关键词： .size distribution clustering intermediate segments glass transition investigate toward glass-forming monomers Polymer Melt Dynamical Heterogeneity spatially heterogeneous mean cluster correlated dynamics mobile subset peak time

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3-D position analysis of an object using a monocular USB port camera through Java

3-D position analysis of an object using a monocular USB por...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Dong Youp Lee Chang Ho Ji Hee Kwon Ha Seung Gweon Jeong Joong Eup Keh Keun Kug Choi Chung Duk Kim Man Hyung Lee Department of Interdisciplinary Program in Mechatronics Pusan National University South Korea Department of Intelligent & Mechanical Engineering Pusan National University South Korea Aircraft Division Defense Quality Assurance Agency South Korea Ground Vehicle Division Defense Quality Assurance Agency South Korea Technical Center Samsung Techwin Plant #3 South Korea Korea Science and Engineering Foundation South Korea School of Mechanical Engineering Pusan National University busan South Korea

ISBN: (纸本)0780370902

This paper's purpose is to obtain 3-D information by using a monocular camera. This system embodies to obtain the height of an object by using a trigonometry method between a reference point of circumstance and an object. It is possible to build up a system regardless of operating system, and then set it up. A USB port camera is used everywhere without a capture board. The Internet can be used by using applet and JMF. The authors regard the camera as fixed and they have developed a real-time JPEG/RTP network camera system using UDP/IP on Ethernet.

关键词： Universal Serial Bus Cameras Java Equations mechanical engineering Monitoring Quality assurance Humans Mechatronics Aircraft

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Linking measurements of coronary flow reserve in patientsduring angioplasty procedures to myocardial perfusionusing computational hemodynamics

Linking measurements of coronary flow reserve in patientsdur...

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ASME 2000 International mechanical engineering Congress and Exposition, IMECE 2000

作者： Banerjee, Rupak K. Back, Lloyd H. Back, Martin R. Cho, Young I. Division of Bioengineering and Physical Science National Institutes of Health BethesdaMD20892 United States Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109 United States Division of Vascular Surgery University of South Florida TampaFL33606 United States Department of Mechanical Engineering &mechanics Drexel University PhiladelphiaPA19104 United States

ISBN: (纸本)9780791819340

ComputatIOnal hemodynamics was used to detennine theconnection between measurements of coronary flow reserve (CFR)and myocardIal perfusion in patients with obstructive disease duringangioplasty. The 32 patient group (Wilson et al. 1988) had singlevessel, single-lesions with either unstable angina pectoris or stableangina, but no known abnonnalities that might affect the vasodilatorcapacity of the arteriolar *** patients' maximal vasodilation-distal perfusion pressure curve(CFR-p,.") was uniquely detennined by the intersections of measuredvalues of CFR and computed values of P,'h for the native and residuallesions after percutaneous transluminal coronary balloon angioplasty(PTCA) supplying blood to the same vasculature. Extrapolation ofthis nearly linear curve to its origin gave a zero-flow mean pressureP,o of about 20 mm Hg, close to a value of 18 mm Hg known to beassociated with ischemia in the subendocardium of dog hearts (Bacheand Schwartz, 1982). The corresponding value of P'h of about 55mm Hg in the native lesions coincided with the level proposed byBrown et al. 1984 to cause ischemia in the subendocardtum of humanhearts. © ASME International mechanical engineering Congress and Exposition, Proceedings (IMECE).

关键词： Hemodynamics

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