检索结果-内蒙古大学图书馆

MULTIPLE STATES OF A VISCOUS FREE SURFACE FLOW: TRANSITION FROM PRE-METERED TO A METERING INFLOW

International Journal for Numerical Methods in Fluids 1998年第9期24卷

作者： M. S. Carvalho L. E. Scriven Coating Process Fundamentals Program Center for Interfacial Engineering and Department of Chemical Engineering and Material Science University of Minnesota Minneapolis MN 55455 U.S.A.

In a forward-roll coating gap or nip, steady laminar flow of liquid between counter-rotating cylinders or rolls is used to split the flow into a coated layer on one roll and a rejected layer on the other. Both layers have free surfaces in contact with air. Liquid may be carried into the gap as a layer on one or both rolls. If the arriving layer is not too thick, all of the liquid flows through the gap, a situation called pre-metered . If the arriving layer is too thick, part of the liquid is rejected and runs back down the lower roll. The flow rate through the gap is said to be metered and is not known a priori . The transition from a pre-metered regime to the metered situation was examined by solving the Navier–Stokes system for steady, two-dimensional flow in a domain bounded by free surfaces, two rigid roll surfaces and chosen inflow and outflow surfaces. The free boundary condition , as described by Papanastasiou et al. ( Int. j. numer methods fluids , 14 , 587 (1992)), was explored and proved to accommodate both the pre-metered and metered regimes. A run-back flow state across the synthetic inlet plane was obtained, provided a condition on the thickness of the arriving layer was replaced by a kinematic condition at a certain stage. The coupled equation system was solved by Galerkin's method with finite element basis functions. The resulting non-linear algebraic system was solved by Newton's method with initialization by pseduo-arc-length continuation and automatic parameter step adjustment. Results show the existence of multiple solutions which can lead to hysteresis. Flow regime maps were constructed to portray the operating parameter range in which a coating bead can exist and the ranges in which a coating gap operates in either the pre-metered or the metering regime. © 1997 by John Wiley & Sons, Ltd. Int. j. numer. methods fluids 24: 813–831, 1997.

关键词： pre-metered metered free boundary condition free surface flow viscous

来源：评论

学校读者我要写书评

暂无评论

A device simulation of the BBT effect in flash memory cells and implications for the development of high-reliability memory cells

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第11期79卷 51-57页

作者： Hayashi, T Fukuda, K Ohno, M Nishi, K Kita, A VLSI R&D Center OKI Electric Industry Company Ltd. Hachioji-shi Japan 193 Graduated from the Science University of Tokyo Dept. of Applied Physics in 1986 and joined Oki Electric. Since then he has been engaged in research on the reliability of MOS transistors and silicon oxide films. Since 1994 he has been engaged in the development of flash memory. He is a member of the Applied Physics Society. Graduated from the University of Tokyo Dept. of Applied Physics in 1983 and joined Oki Electric in 1985. Since then he has been engaged in research on the semiconductor process and device simulation. In 1990 he participated in joint research at the Technical University of Aachen. He is a member of the Applied Physics Society. Graduated from the Tokyo University of Agriculture and Technology Dept. of Electrical Engineering in 1980 and completed an MS course in 1983. In 1986 he completed the doctoral course at Shizuoka University. He then joined Oki Electric where he has been engaged in research on ULSI processes. He is now a manager responsible for flash memory at the VLSI R&D Center. He holds a doctorate in engineering. He is a member of the Applied Physics Society. Graduated from the University of Tokyo Dept. of Applied Physics in 1973 and joined Oki Electric. He was engaged in the development of integrated circuit logic simulation technology and bipolar process technology and since 1980 he has been engaged in research on process/device simulation and modeling. Presently he is a senior manager at the VLSI R&D Center. In 1982–1984 he was a Visiting Scholar at MIT. He holds a doctorate in engineering. He is a member of the Applied Physics Society and a senior member of IEEE. Graduated from Tokyo Institute of Technology Dept. of Chemical Engineering in 1978 and completed the MS program in 1930. In that year he joined Oki Electric. Since then he has been engaged in CMOS process design for DRAM and flash memory. He is now a manager at the VLSI R&D Center. He is a member of the Applied Physics Society.

In order to analyze the BBT (band-to-band tunneling) phenomenon in flash memory cells by simulation, a new model is proposed, which improves on the BBT model by introducing the concept of ''average electric field.'' This model agrees well with the measured results in a wide drain N-concentration range. Using this model, the reliability of memory cells is analyzed. It is found that the difference of the amount of BBT generation does not directly affect the endurance characteristics but does affect the disturb characteristics. The same model can be used to analyze problem points of the present cells and to estimate the BBT current of next-generation devices accurately.

关键词： band-to-band tunneling flash memory simulation endurance characteristics

来源：评论

学校读者我要写书评

暂无评论

Abstracts of papers presented at the 14th conference of the Weed Science Society of Israel Abstracts of papers presented at the international conference on controlled atmosphere and fumigation (CAF) in stored products Abstracts of papers presented at the joint international conference of FAOPMA — CEPA on pest control in the 21st century Abstracts of papers presented at the 2nd international Agro-Ecology Symposium on integrated pest management: from the drawing board to the market

引用

Phytoparasitica 1996年第3期24卷 199-265页

作者： E. Yogev M. Berson Y. Benyamini Y. Sheinboim T. Lev-Ran A. Bahat Y. Barkai Y. Gatti M. Zaidan O. Barazani Y. Boshvize S. Graph U. Luchinsky T. Blumenfeld Y. Kleifeld G. Herzlinger H. Bucsbaum S. Golan T. Chilf R. Aly Y. Ohali A. Ovadia Y. Chachlon H. Yovel Y. Tesler G. Colodney A. Nir S. Zarka A. Tal B. Rubin T. Yaacoby Y. Alon Y. Kedar Orit Ben-Zvi Assaraf O. Shainberg H. D. Rabinowitch E. Tel-Or Y. Goldwasser D. M. Joel D. Plakhine V. Portnoy G. Tzuri N. Katzir Dalia Losner-Goshen A. M. Mayer R. Jacobsohn Z. Tanaami H. Eisenberg Ziva Amsellem Z. Kernyi L. Hornok J. Gressel Adiva Shomer-Ilan Ela Nir Daphna Michaeli V. Kampel A. Warshawsky M. Yogev M. Negbi J. Hershenhorn Y. Lavan T. Hilf M. Horowitz M. Cohen I. Hirsch A. Veneziani S. T. Conyers C. H. Bell Ana C. Sá-Fischer C. S. Adler Ch. Reichmuth P. W. Flinn D. W. Hagstrum G. N. Mbata R. G. Winks Elisabeth A. Hyne M. Q. Chaudhry A. D. MacNicoll N. R. Price M. Schöller J. -F. Dugast R. Plarre S. Navarro E. J. Donahaye R. Diaz Miriam Rindner A. Azrieli P. Trematerra F. Fontana M. Mancini Ailsa D. Hocking Marta H. Taniwaki J. Lacey A. Hamer N. Magan N. Paster F. M. Caliboso D. G. Alvindia G. C. Sabio M. T. dela Cruz Okky Setyawati Dharmaputra A. S. R. Putri M. Sidik Eleni Papademetriou A. Varnava C. Mouskos M. A. Malek B. Parveen K. A. Dzisi W. O. Ellis Ana Maria Estevez Ljubica Galletti T. Fichet E. Oteiza L. A. Lizana M. X. Gonzalez B. Yakobson Y. Slavezky H. Ephrati El-H. Bartaly R. K. Kashyap M. Gupta W. L. Kashyap B. S. Dahiya A. K. Dash J. R. Rangaswamy R. D. Shroff D. S. Jayas W. E. Muir N. D. G. White L Gaye Weller J. E. van S. Graver Wu-Kang Peng M. Bengston E. Alip C. Reed J. G. Leesch G. F. Knapp G. F. Russell L. B. Llewellin Ch. Ulrichs H. J. Banks P. C. Annis R. Allanson R. Tauscher K. Westphal S. Mohan M. Gopalan P. C. Sumdarababu V. V. Sree Narayanan Sabine Prozell G. Ziegleder B. Schartmann R. Matissek J. Kraus D. Gerard S. Rogg W. Raemann R. F. Ryan Ya-Nan Wang R. T. Noyes P. Kenkel J. T. Criswell G. W. Cuperus C. J. Waterford C. P. Whittle L. Be Luxembourg Chemicals and Agriculture Ltd. Tel Aviv Israel Agrochemicals Dept. Milchan Bros. Ltd. Ramat Gan Israel Extension Service Ministry of Agriculture Zefat Mevo Hamma Ramat HaGolan Israel Dept. of Weed Science ARO Newe Ya’ar Research Center Haifa Israel Agrochemicals Department Milchan Bros. Ltd. Ramat Gan Israel Tarsis-Agrichem Tel Aviv Israel Weed Control Co. Ltd. Bet Dagan Israel Dept. of Field Crops Vegetables and Genetics The Hebrew University of Jerusalem Faculty of Agriculture Rehovot Israel Plant Protection and Inspection Services Ministry of Agriculture Bet Dagan 50250 Agan Chemical Manufacturers Ltd. Ashdod Israel Dept. of Field Crops Vegetables and Genetics Rehovot Dept. of Agricultural Botany The Hebrew University of Jerusalem Faculty of Agriculture Rehovot Israel Dept. of Weed Science ARO Newe Ya’ar Research Center Haifa Dept. of Botany The Hebrew University of Jerusalem Jerusalem Israel Dept. of Vegetable Crops ARO The Volcani Center Bet Dagan Israel Dept. of Plant Genetics Weizmann Institute of Science Rehovot Israel Inst. for Plant Science Agricultural Biotechnology Center Gödöllö Hungary Dept. of Botany Tel-Aviv University Tel Aviv Israel Dept. of Plant Genetics The Weizmann Institute of Science Rehovot Israel Dept. of Organic Chemistry The Weizmann Institute of Science Rehovot Israel Dept. of Ornamental Horticulture ARO The Volcani Center Bet Dagan Israel Weed Control Co. Ltd. Bet Dagan Chem-Nir Ltd. Kefar Shemaryahu Tiveon-Chem Co. Haifa Israel Central Science Laboratory Ministry of Agriculture Fisheries and Food Slough Berks UK Federal Biological Research Centre for Agriculture and Forestry Inst. for Stored Product Protection Berlin Germany USDA-ARS Grain Marketing and Production Research Center Manhattan USA School of Biological Sciences Abia State University Uturu Nigeria CSIRO Division of Entomology SCMC Nambour CSIRO Division of Entomology Canberra Australia DowElanco Europe Letcombe Laboratory L

来源：评论

学校读者我要写书评

暂无评论

A parallel control strategy abstracted from the baroreceptor reflex

A parallel control strategy abstracted from the baroreceptor...

引用

American Control Conference (ACC)

作者： M. Pottmann M.A. Henson B.A. Ogunnaike J.S. Schwaber Neural Computation Program Process Modeling and Advanced Control Group E. l. Du Pont de Nemours and Company Inc. Wilmington DE USA Department of Chemical Engineering Louisiana State University Baton Rouge LA USA

A parallel control strategy is developed for process applications by "reverse engineering" the functions of the baroreceptor reflex, the biological control system system which regulates arterial blood pressure. The parallel control technique is applicable to single-input processes with two types of output measurements: (i) a primary measurement of the controlled output which has unfavorable dynamic responses to input changes; and (ii) a secondary measurement of a different output which has more favorable dynamic characteristics. In order to provide high performance disturbance rejection, the parallel control system uses the primary and secondary outputs in a coordinated fashion. An H/sub 2/-optimal controller is designed and implemented using a parallel control architecture which is derived from a biologically-inspired control structure. The parallel control strategy is shown to provide improved performance and robustness as compared to conventional cascade control.

关键词： Baroreflex Biological control systems Pressure control Control systems Blood pressure Arterial blood pressure Heart rate Pressure measurement chemical processes Central nervous system

来源：评论

学校读者我要写书评

暂无评论

PERCHL0R0ETHYLENE EXTRACTION DESULFURIZATION OF WEATHERED COALS

引用

Liquid Fuels Technology 1993年第3-4期11卷 507-527页

作者： Padmakar Vishnubhatt[a] Sunggyu Lee - To whom all correspondence should be directed.[b] Conrad J. Kulik[b] [a] Process Research Center Department of Chemical Engineering The University of Akron Akron OH [b] Fuel Science Program Electric Power Research Institute Palo Alto CA

The perchloroethylene extraction process has proven to be an effective pre- combustion coal desulfurization process which offers a complete process package including wet grinding, organic sulfur removal, pyrite and mineral matter separation, solvent recovery, and byproducts and sulfur recovery. In this paper, coal weatherability was investigated for various Midwestern and Eastern U.S. coals, and its effect on organosulfur extractability by the perchloroethylene process was identified. Both “natural” and “artificial” weathering of these coals were experimentally investigated. A statistically significant difference in the extraction efficiency between fresh and weathered coals vas observed. A strong relation between the extractability and degree of weathering of the coal was established. The results provide a valuable insight into the process engineering of this process.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Cobeneficiation of Coals in Perchloroethyleke Extraction Desulfurization

引用

Fuel Science and Technology International 1993年第5-6期11卷 831-843页

作者： Lee, Sunggyu Vishnubhatt, Padmakar Berthinee, Elizabeth A. Process Research Center Department of Chemical Engineering Akron OH 44325-3906 United States Fuel Science Program Electric Power Research Institute Palo Alto CA 94303 United States

The perchloroethylene (PCE) coal refining process has been investigated for its process feasibility, operational reproducibility, organic sulfur selectivity, process efficiency, minimization of residual chlorine by steam stripping and process optimization. It was found that some coals result in a better organosulfur extraction than others. It was also confirmed that the PCE extraction process was a hybrid system of chemical reaction and physical solvation. It was further established that the coals giving a higher organosulfur extraction contain some naturally available ingredients, which promote the extraction process. Coals giving a much lower organosulfur extraction lack these species. This paper focuses on demonstration of the process feasibility of cobeneficiating both types of coals, together. In this novel process, both types of coal are blended together in fixed proportions and subjected to the PCE process. This process of cobeneficiating coals is industrially significant because of its cost effectiveness. It not only removes the organosulfur from one type of coal, but also significantly improves the organosulfur extraction from the other. © 1993, Taylor & Francis Group, LLC. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

NEURAL-NETWORK APPROACH TO SENSOR DESIGN

NEURAL-NETWORK APPROACH TO SENSOR DESIGN

引用

IEEE 1992 ULTRASONIC SYMP

作者： LEC, RM MUSAVI, MT PENDSE, HP AHMED, W Department of Electrical Engineering Industrial Process Control Sensor Systems(IPCoSS) Program University of Maine Orono 04469 United States Department of Chemical Engineering Industrial Process Control Sensor Systems(IPCoSS) Program University of Maine Orono 04469 United States

ISBN: (纸本)0780305620

One of the important tasks in sensor design is the development of a model for a sensing phenomena. Artificial neural networks are ideal for such a task because of their capability for representation of the mapping functions describing the processes and phenomena which are mathematically difficult or even intractable. We examined a radial basis function (RBF) neural network for modeling of acoustical properties of colloidal TiO₂ slurry. The colloidal slurry is a very complex multiphase medium. The RBF network with a set of local Gaussian functions was trained using the data from the earlier developed physical model of TiO₂ slurry. Next the TiO₂ neural model was used for a prediction of the TiO₂ particle size distribution. The resulting prediction accuracies of the RBF network was 99.8% for the data used in the training process and 88% for the data not used in the training. Compared to other available techniques neural networks can offer an effective and time efficient approach for the modeling of complex materials. © 1992 IEEE.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

ELASTOHYDRODYNAMICS OF BLADE COATING

引用

AICHE JOURNAL 1990年第4期36卷 587-597页

作者： PRANCKH, FR SCRIVEN, LE Coating Process Fundamentals Program Department of Chemical Engineering & Materials Science University of Minnesota Minneapolis MN 55455

Blade coating is the most common method of coating paper, and it is applied in coating magnetic suspensions and adhesives. Typically, the blade's upstream edge is clamped into a rigid holder so that the blade and substrate form a converging wedge. The translating substrate drags liquid into the wedge, where liquid forces develop and deflect the elastic blade, but it is loaded externally to counteract the deflection. Liquid dragged past the blade and thus the coating thickness depend on the elastohydrodynamic interaction among blade, liquid, and loading. Shell theory and lubrication flow theory describe the interaction by means of differential equations that are shown to be equivalent to Saita and Scriven's (1985) earlier formulation but that lead to a computationally more efficient analysis. Predictions computed agree with those of the earlier formulation and with experiments. Moreover, the new predictions illustrate effects of normal force loading and broaden the theory of blade coating.

关键词： Coating Techniques

来源：评论

学校读者我要写书评

暂无评论

AN APPLICATION OF TOTAL QUALITY MANAGEMENT AT AN INTERMEDIATE MAINTENANCE ACTIVITY

引用

NAVAL ENGINEERS JOURNAL 1990年第6期102卷 35-43页

作者： NEEDHAM, WD USN is currently assigned as the Pacific Submarine Force maintenance officer in Pearl Harbor Hawaii. He is a 1972 Magna Cum Laude graduate of Duke University with a BS in mechanical engineering a 1983 graduate of Central Michigan University with an MA in business management and a 1986 graduate of MIT with an MS in materials science and an OE in ocean engineering. Cdr. Needham was selected for the Nuclear Power Program and following initial qualification on the USSGrayling (SSN-646) served as production training assistant officer at S7G Prototype and as engineer officer of USSNathan Hale (SSBN-623). He transferred to the EDO community in 1981 and has served as nuclear repair officer at Norfolk Naval Shipyard and as repair officer of USSHunley (AS-31). His awards include the Meritorius Service Medal with gold star the Navy Commendation Medal the Navy Achievement Medal the Spear Foundation Award the Vice Admiral C. R. Bryan Award and the Award for Excellence in Corrosion Engineering of the Chemical Process Industries. He is a registered professional engineer in the state of Virginia.

The current budget and resource constrained fiscal environment mandates positive measures to improve productivity. The management practices of the last four decades are no longer valid. The Department of Defense (DoD) has issued broad guidelines for a restructuring of all subordinate commands and agencies called total quality management (TQM). The precepts of TQM are not new. They are the very same precepts prescribed by numerous management and quality control experts for the past decade to reverse the downward trends in the productivity of American industry. The program elements of TQM are broad in scope, as they must be for an organization as large and diverse as DoD. The implementation of TQM at the local command level is left to the local commander. This is no mean task, as TQM is a radical departure from traditional management practice in every aspect of an organization. This article reports on the implementation of TQM at a local command, the USS Hunley , a naval auxiliary support ship whose primary mission is the repair and maintenance of a squadron of nuclear-powered submarines in Norfolk, Virginia.

关键词：

来源：评论

学校读者我要写书评

暂无评论

NAVAL PROPULSION SYSTEMS WATER-TREATMENT AND CONTROL

引用

NAVAL ENGINEERS JOURNAL 1985年第4期97卷 133-137页

作者： EICHINGER, BJ The Author is head of the Water Technology and Process Materials Section Naval Ship Systems Engineering Station (NAVSSES) in Philadelphia. She graduated from Marywood College in 1965 with a bachelor's degree in chemistry. Ms. Eichinger began her career with the Navy as an analytical chemist responsible for resolution of shipboard problems involving water water-formed deposits corrosion contamination and chemical cleaning. She with NAVSSES engineers corrected significant fleet problems arising from contaminants in submarine main hydraulic fluid systems and distillate fuel systems. Ms. Eichinger coordinated with the Naval Sea Systems Command to develop evaluate and implement the water treatment program now in use for all non-nuclear naval propulsion and auxiliary water and steam systems. She is a current member of the American Society of Mechanical Engineers and the author of the Naval Ships' Technical Manual chapter Boiler Water/Feedwater Test and Treatment.

The causes and effects of corrosion and contamination in conventional steam generator systems are described briefly. Treatment and control methodologies currently used by the Navy for feedwater, steam, condensate, and boiler water are detailed. Examples are cited of the manner in which Navy personnel are trained in interpretation of analytical data and in trend analysis in order that the ship can exercise preventive and corrective control of problems. Ancillary subjects discussed include chemical cleaning, mechanical cleaning, and out-of-service preservation. An overview of planned improvements is provided.

关键词： FEEDWATER TREATMENT

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：