检索结果-内蒙古大学图书馆

A GEOMETRIC INTERPRETATION OF THE FEASIBILITY OF REACTIVE EXTRACTION REEXTRACTION OF PENICILLIN-G

JOURNAL OF BIOTECHNOLOGY 1992年第1期23卷 95-102页

作者： PATNAIK, PR Biochemical Engineering Research and Process Development Center Institute of Microbial Technology Sector 39-A Chandigarh India

The reactive extraction (re-extraction) of penicillin G from reaction mixtures is based on complexation with a carrier and subsequent dissociation of the complex. An established mathematical model for this has been analysed to develop a feasibility domain within which the process may be designed and optimised. Geometric and physical interpretations of this domain are provided.

关键词： REACTIVE EXTRACTION MATHEMATICAL MODEL FEASIBILITY DOMAIN

来源：评论

学校读者我要写书评

暂无评论

PRODUCTION AND PROPERTIES OF CARBOXYMETHYLCELLULASE (ENDO-1,4-BETA-GLUCANASE) FROM CURVULARIA-LUNATA

引用

WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY 1992年第4期8卷 423-424页

作者： BANERJEE, UC CHAKRABARTI, S Biochemical Engineering Research and Process Development Centre Institute of Microbial Technology Chandigarh India Department of Pharmaceutical Chemistry University of Kansas Lawrence USA

An extracellular carboxymethylcellulase (endo-1,4-beta-glucanase) from Curvularia Lunata, grown at 30-degrees-C with an initial pH of 6.0, had optimal activity at pH 4.8 and 50-degrees-C. The enzyme was unstable above... 详细信息

关键词： CARBOXYMETHYLCELLULASE CURVULARIA-LUNATA ENZYME KINETICS TEMPERATURE AND PH OPTIMA THERMOSTABILITY

来源：评论

学校读者我要写书评

暂无评论

CASCADE AIR STRIPPING - TECHNOECONOMIC EVALUATION OF A NEW GROUND-WATER TREATMENT process

引用

GROUND WATER MONITORING AND REMEDIATION 1992年第2期12卷 100-104页

作者： NIRMALAKHANDAN, N PEACE, GL SHANBHAG, AR SPEECE, RE Dr. N. Nirmalakhandan received his B.S. degree from University of Sri Lanka and M.S. and Ph.D. degrees from Drexel University Pennsylvania. He is a registered professional engineer and is currently an associate professor in the Civil Agricultural and Geological Engineering (CAGE) Department of New Mexico State University (Las Cruces NM 88003). His research areas include fate transport treatment and mangement of organic contaminants. He has published several papers in these areas in leading environmental engineering journals. His work on the cascade air-stripping technology has also been widely published and has been supported by the American Water Works Association Research Foundation and New Mexico Water Resources Research Institute. A. Shanbhag is a graduate student in the CAGE Department New Mexico State University (Las Cruces NM 88003). The techno-economic analysis presented in the paper is based on his M.S. thesis work. Dr. R.E. Speece is centennial professor in the Civil and Environmental Engineering Department at Vanderbilt University (Nashville TN 37235). He has been involved in the development of the cascade air-stripping process from its inception.

A simple modification of the conventional air-stripping process introduced as cascade air stripping is proposed for efficient and economical removal of semivolatile and low volatility contaminants from ground water. The technical feasibility and economic viability of this process are evaluated using field test results and cost model simulations. The field tests enabled the process model to be verified at various water flow rates ranging from 150 gpm to 400 gpm. The field study also demonstrated the feasibility of the proposed system at a near full-scale level. Cost models were used to compare the proposed process to conventional air stripping and granular-activated carbon adsorption in removing a range of contaminants. This analysis showed that the treatment cost ([/100 gal) of cascade air stripping is about 15 percent lower than conventional air stripping and about 40 percent lower than granular-activated carbon adsorption.

关键词：

来源：评论

学校读者我要写书评

暂无评论

APPLICATIONS OF SUPERCONDUCTIVITY TO VERY SHALLOW-WATER MINE SWEEPING

引用

NAVAL ENGINEERS JOURNAL 1992年第3期104卷 53-64页

作者： GOLDA, EM WALTERS, JD GREEN, GF LCdr. E. Michael Golda:is a Naval Reserve engineering duty officer. He has provided direct support to code 2712 at the David Taylor Research Center during the last eighteen months as a member of the group studying applications of superconductivity to mine countermeasures. LCdr. Golda received his Ph.D. and M.S. in materials science and engineering from Stevens Institute of Technology Hoboken N.J. A 1977 graduate of the United States Naval Academy LCdr. Golda has been a member of ASNE since 1974. Dr. Joseph D. Walters:received his Ph.D. in physics in 1990 from Portland State University in Portland Oregon. At the University Dr. Walters work included experimental and theoretical investigations of critical heat transfer phenomena in liquid helium and theoretical research into the finite time thermodynamics of refrigeration cycles. Currently Dr. Walters is a project engineer in the cryogenic engineering group at the David Taylor Research Cen-ter(DTRC) in Annapolis Maryland. Since joining DTRC in 1990 Dr. Walters has been assessing cryogenic related issues impacting superconductivity applied to mine countermeasures including choice of superconductor refrigerator system mass and logistical arrangements. Additionally Dr. Walters is developing theoretical models designs and testing a set of high critical temperature superconducting current leads for SMES. Geoffrey F. Green:is the cryogenic engineering group leader at the David Taylor Research Center(DTRC) in Annapolis Maryland. He received his B.S. and M.S. in mechanical engineering from Pennsylvania State University in 1970 and 1972 respectively. Since then Mr. Green has worked at DTRC on the development of a superconducting electric drive system for Navy Ships. In 1980 he assumed responsibility for development of the cryogenic and machinery cooling technologies. Mr. Green has co-authored more than 25 papers/reports in cryogenic refrigeration and superconducting machinery and has several patents in cryogenics. He is on the executive committee of the P

Recent experiences in the Persian Gulf have clearly demonstrated the need for improved mine sweeping, or mine counter-measures (MCM), to support amphibious operations. Characteristics of MCM systems currently used to counter magnetic influence mines restrict sweep rates, limit the ability to accurately simulate a ship's magnetic signature, and require a minimum water depth. Advances in superconducting technology over the last twenty years have significantly increased the feasibility of superconducting mine countermeasures (SCMCM) for magnetic influence mines. An SCMCM system would be small, light, and simple compared to currently deployed MCM systems. Superconducting magnets could be fabricated in steady state configurations or configurations that would significantly improve the ability to simulate non-symmetric, time-varying magnetic signatures of ships. SCMCM systems could be deployed from either surface or airborne platforms. An airborne system would protect the magnet from blast damage, permit the highest sweep rates, and allow unrestricted sweeping over entire amphibious objective areas, including the surf. A light weight SCMCM system would permit use of additional airborne platforms which may include remotely piloted airborne vehicles. Remotely piloted surface or airborne vehicles would totally eliminate risks to personnel. An SCMCM system could be demonstrated immediately utilizing existing technology and may offer significant advantages over existing MCM systems used to counter magnetic influence mines in very shallow water.

关键词： Military engineering

来源：评论

学校读者我要写书评

暂无评论

development AND CERTIFICATION OF HSLA-100 STEEL FOR NAVAL SHIP CONSTRUCTION - REPLY

引用

NAVAL ENGINEERS JOURNAL 1990年第4期102卷 103-104页

作者： CZYRYCA, EJ LINK, RE WONG, RJ AYLOR, DA MONTEMARANO, TW GUDAS, JP Ernest J. Czyryca:is a research project leader in the Metals and Welding Division of the David Taylor Research Center. He participated in the cooperative education program at the Center with Drexel University graduating in 1965 with a B.S. degree in metallurgical engineering. He has since received a B.S. degree in civil engineering in 1969 from Johns Hopkins University and an M.S. degree in engineering mechanics in 1970 from the Pennsylvania State University. In his career at the Center he has been involved in or managed major development programs in naval structural metals alloys for machinery applications failure analyses and fatigue and fracture research. Richard E. Link:is a mechanical engineer in the Metals and Welding Division of the David Taylor Research Center. He received his B.S. and M.S. degrees in Mechanical Engineering from the University of Maryland in 1984 and 1985 respectively. His work at the Center includes participation in structural and machinery alloy development programs and research in elastic-plastic fracture mechanics analysis methods. He is an active member of ASTM Committee E-24 on Fracture Testing and the Society for Experimental Mechanics. Richard J. Wong:is a metallurgist in the Metals and Welding Division of David Taylor Research Center. He received his B.S. in materials science from the University of California Berkeley in 1979 and a M.S. degree in engineering science from Catholic University in 1984. His work at the Center includes advanced joining processes weld process development and weldability analysis of naval structural materials. Denise A. Aylor:is a materials engineer in the Metals and Welding Division of the David Taylor Research Center. She received her B.S. degree in materials engineering from Virginia Tech in 1980 and her M.S. degree in materials science and engineering from The Johns Hopkins University in 1984. Her work at the Center has focused on corrosion and corrosion control research of various Navy metallic alloys and of composite materials. Thomas W. M

A significant tonnage of HY-100 steel has been used in the structural designs of new ships and submarines for weight reduction, where HT and HY-80 steels had been previously used. A reduction in hull fabrication costs and higher productivity can be achieved by substitution of an HSLA steel for HY-100. The significant factor in cost savings through use of HSLA steel in fabrication is the reduction or elimination of preheat for welding. Based on the success of the HSLA-80 steel system, a program was initiated to develop and certify an HSLA-100 steel as a replacement for HY-100 in order to reduce fabrication costs. The alloy development and evaluation to support the certification of HSLA-100 steel plate and weldments for surface combatant structural and ballistic protection applications are summarized. HSLA-100 development consisted of three phases: (1) laboratory alloy development to formulate an interim specification; (2) trial steel mill plate production; and (3) plate production for the certification program. An interim specification for HSLA-100 steel plate was used as the basis for the commercial production of over 200 tons of HSLA-100 by domestic steel plate mills. The alloy design of HSLA-100 represents a significantly different metallurgy and microstructure than HSLA-80 steel, but retains the wettability of very low carbon steel. The certification program was conducted to establish the properties, welding characteristics, fabricability, and structural performance of HSLA-100 steel plate over a range of gages from 1/4 to 3 3/4 inches. The certification program included the characterization of production HSLA-100 steel plate mechanical, physical, and fracture properties; evaluation of wettability and welding process limits for structures of high restraint; studies of fatigue properties and effects of marine environments on HSLA-100; and the fabrication and evaluation of large scale structural models to validate the laboratory developed welding process parameters

关键词： Shipbuilding Materials

来源：评论

学校读者我要写书评

暂无评论

Static hazards of drum filling. II. Electrostatic models: Theory and experiment

引用

process Safety Progress 1988年第1期7卷 63-78页

作者： Laurence G. Britton Jack A. Smith Larry Britton earned BS and PhD degrees in Fuel and Combustion Science at Leeds University England. After four years as Research Fellow in Applied Electrostatics at Southampton University he joined Union Carbide's Safety Research Laboratory in 1981 and is currently a Project Scientist. He is a Fellow of the Institute of Energy a Member of AIChE and the Combustion Institute and is a Chartered Engineer in the UK. He was cowinner of the AIChE “Bill Doyle” Award in 1987. Larry serves on the “Classification and Properties of Flammable Liquids” and “Properties of Hazardous Chemicals” committees of the NFPA. Jack Smith is a staff engineer for the Applied Mathematics and Process Simulation group of Central Research and Engineering at Union Carbide specializing in software development for engineering workstations and computational chemistry. He holds M.S. and Ph.D. degrees from the University of Florida in chemical physics and a B.S. from Purdue University in chemistry and mathematics.

For drum filling, a demarcation of 50 pS/m (below which a liquid may accumulate hazardous static in a grounded drum) is conservative and takes account of the effects of temperature and/or charge density on relaxation rate. The worst-case conductivity as regards static accumulation rate is about 0.5 pS/m, but in practice this should not correspond to the worst-case charge generation rate. Published forms of the Schon equation are not conservative for smooth-bore pipes and hoses; a new equation is proposed. Certain rough-bore hoses containing an inner grounding spiral can generate almost as much charge as a microfilter. Theory and experiment are discussed with reference to published Codes and Guidelines; attention is given to filter placement and drum linings.

关键词：

来源：评论

学校读者我要写书评

暂无评论

PREDICTING TEMPERATURE VS TIME BEHAVIOR DURING THE FREEZING AND THAWING OF RECTANGULAR FOODS

引用

BIOTECHNOLOGY PROGRESS 1986年第3期2卷 164-174页

作者： DEREINICK, AR SCHWARTZBERG, H Consejo Nacional de Investigaciones Cientificas y Technicas Argentina Amelia de Reinick:obtained her Ph.D. at the Food Engineering Department at the University of Massachusetts. She is currently working as a researcher and lecturer at INTEC (Institute for Technological Development and the Chemical Industry) at the Universidad Nacional del Santa Fe. Argentina. She has previously worked on heavy water separation and microbiological research. University of Massachusetts Amherst MA 01003 Henry G. Schwartzberg: a past president of the Food Pharmaceutical and Bioengineering Division is a Professor of Process Engineering in the Department of Food Engineering at the University of Massachusetts. His research interests include: solid-liquid extraction freezing mechanical expression and absorption-driven evaporation.

Based on the effective heat capacity characteristics of biological materials during freezing we have derived a short-cut equation for predicting their temperature vs time behavior during freezing and thawing. The equation can be used in the low Biot number range for rectangular bodies with similar or dissimilar heat-transfer coefficients at their different surfaces. It has been experimentally and numerically tested for rectangular blocks of chopped beef with two or four exposed sides for Biot numbers ranging between 0 and 3. In this range it predicts temperature vs time behavior with errors of less than 5 to 10% in terms of overall processing time. By using numerical methods, the approach used can be extended to handle problems involving time-varying boundary conditions and many types of non-linear, physical-property behavior.

关键词： FOOD PRODUCTS

来源：评论

学校读者我要写书评

暂无评论

MPCS - THE MANUFACTURING process-CONTROL SYSTEM

引用

AT&T TECHNICAL JOURNAL 1986年第4期65卷 35-45页

作者： DUNIETZ, IS HSU, JLC MCEACHERN, MT STOCKING, JH SWARTZ, MA TROMBLY, RM The authors Irwin S. Dunietz John L.C. Hsu Michael T. McEachern James H. Stocking Mark A. Swartz andRodney M. Tromblyare responsible for design and development of the Manufacturing Process Control System. Mr. Dunietz joined AT&T in 1980. He is a member of the technical staff in the Manufacturing Information Automation department at AT&T Engineering Research Center Princeton New Jersey. He received an A.B. in mathematics from Cornell University and an M.S.E. in computer science from Princeton University. Mr. Hsu who joined AT&T in 1970 is a department head in the Manufacturing Information Automation department at the Engineering Research Center. He received an M.S. in electrical engineering from the University of Missouri. Mr. McEachern joined AT&T in 1962 and is a supervisor in the 5ESS™ Line Unit Manufacturing department at AT&T Technologies in Oklahoma City Oklahoma. He is responsible for the manufacturing process control center in Oklahoma City which provides computerized support for all circuit pack manufacturing. Mr. Stocking who joined AT&T in 1975 is a supervisor in the Manufacturing Information Automation department at the Engineering Research Center. He received a B.S. in chemical engineering from Rensselaer Polytechnic Institute and a Ph.D. in chemical engineering from the University of California Berkeley. Mr. Swartz joined AT&T in 1980 and is a member of the technical staff in the Manufacturing Information Automation department at the Engineering Research Center. He received an A.B. in computer science from Cornell University and an M.S. in computer science from Rutgers—The State University. Mr. Trombly who joined AT&T in 19 78 is an assistant manager at the AT&T Merrimack Valley Works in Massachusetts. Previously he was a supervisor at the Engineering Research Center. He holds a B.S. in computers and systems engineering and an M.S.E.E. from Rensselaer Polytechnic Institute.

The central challenge of all manufacturing is making products to the right standards and delivering them at the right time. AT&T is upgrading its corporate and factory resource planning systems to improve control of day-to-day manufacturing. The Manufacturing process Control System (MPCS), developed at the AT&T engineering research Center (ERC), provides this support. MPCS connects the shop floor with production scheduling, accounting, product data archive, and engineering support systems.

关键词： PRODUCTION CONTROL

来源：评论

学校读者我要写书评

暂无评论

CREATIVE WAYS OF REVAMPING NH3 PLANTS CAN IMPROVE PROFITABILITY.

引用

Plant/operations progress 1984年第2期3卷 101-107页

作者： Wang, Shoou-I Patel, Nitin M. Air Products and Chemicals Inc. Allentown Pa. 18105 Shoou-I Wang:is Manager of Hydrogen and Syngas Section Process Engineering Air Products & Chemicals Inc. Allentown Pa. He is responsible for high temperature process design activities on hydrogen carbon monoxide ammonia and methanol plants. He is also program manager for research and development in the hydrogen and carbon monoxide areas. He received a BS from Chung-Yuan University and an MS and PhD from Montana State University all in chemical engineering. Nitin M. Patel:is principal process engineer with Air Products & Chemicals Inc. Allentown Pa. He is responsible for high temperature process design/optimization activities regarding hydrogen carbon monoxide and ammonia plants. He received his BS from University of Baroda and his MS from Georgia Institute of Technology (Georgia Tech) both in chemical engineering.

High energy costs have created a need to revamp existing ammonia plants to reduce the overall energy consumption per unit ton of production. This paper discusses the Air Products and Chemicals, Inc. (APCI) NH//3 plant bottlenecks and shares some successful experience in revamping to overcome bottlenecks associated with capacity expansion, and overall performance efficiency/reliability improvements.

关键词： AMMONIA

来源：评论

学校读者我要写书评

暂无评论

THE NO FRAME CONCEPT - ITS IMPACT ON SHIPYARD COST

引用

NAVAL ENGINEERS JOURNAL 1984年第3期96卷 218-232页

作者： NAPPI, NS WALZ, RW WIERNICKI, CJ Natale S. Nappi:graduated from City College of New York in 1954 with a B.S. degree in civil engineering and received his M.S. in civil engineering from the Polytechnic Institute of Brooklyn in 1959. He began his professional career in 1954 at the New York Naval Shipyard as a naval architect (structures) performing detail structural design and fabrication studies for CVAs LPDs DDs and CGs and eventually became a supervisory naval architect (structures). From 1965 to 1973 he was a member of the staff of the Computer-Aided Design Division at the David Taylor Naval Ship Research and Development Center (DTNSRDC). As such he was involved in the development of the computer structural design tool the SSDP (in association with Frank M. Lev) and automated detail design programs (CASDOS). His current position is Senior Naval Architect Consultant in the structural integrity group of the Ship Structures Division Structures Department DTNSRDC. Mr. Nappi is the author and co-author of numerous technical papers and reports covering a wide spectrum of topics such as automated structural design process design for producibility and survivability material weight and cost trade-off studies and structural weight determination for high performance ships (i.e. SES SWATH HYSWAS). He has lectured on the subjects of design for survivability and ship structures at the Naval Post Graduate School and MIT. He is a member of ASNE ASCE U.S. Naval Institute Sigma Xi and is a registered Professional Engineer in the State of New York. Mr. Nappi was a member of the NAVSEA working commitee for the computer supported design planning effort and is currently a member of the DTNSRDC ASSET Advisory Committee. Ronald W. Walz:graduated in 1974 from Pennsylvania State University with a B.S. degree in civil engineering. He began his professional career in 1974 at the David Taylor Naval Ship Research and Development Center as a structural engineer in the structural design concepts group of the Ship Structures Division Structures Department.

A proposed cost effective alternative to current U.S. Navy structurally configured hulls is presented in this paper. This proposed design for producibility concept involves the elimination of structural stanchions and transverse web frames. The potential impact of this “no frame” concept on structural design, weight and construction and material costs for naval surface frigates and destroyers is reflected in 1) reduced costs for the installation of distributive systems and 2) a reduced number and complexity of structural details providing a more reliable and less costly structure. This study was performed in three parts: 1) Determine the most feasible length between bulkheads without frames; 2) Using this length perform detail weight studies and construction and material costs analysis comparison on a 72-foot long hull module, with and without frames, for a FFG-7, and 3) Estimate the saving in man hours of labor on the installation of distributive systems and shipfitting for an FFG-7. For the feasible length studies on the “no frame” structural configuration, thirty-seven strength, weight and vertical center of gravity studies were performed on two ship classes; twenty-two on the FFG-7 class and fifteen on the DD-963 class. The detailed weight studies and construction and material cost analyses were conducted for FFG-7 “no frame” and “as built” modules. Results indicating the “no frame” concept module was 6.8% heavier and 14.8% less costly than the “as built” module. For the impact of an FFG-7 “no frame” structurally configured hull on the cost of labor required for the installation of distributive systems and for other functional work such as ship fitting, welding, and electrical, this study indicated a reduction of 169,206 labor hours per ship, representing 7.12% of the total required man hours to fabricate an FFG-7 class ship. With the employment of the “no frame” concept, certain areas of significant concern and potential risk were addressed. These include: 1) t

关键词：

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：