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天津理工学院学报 2003年第1期19卷 5-9页

作者：王韬秦德郝志勇刘国印天津大学内燃机研究所 300072 天津大学机械工程学院 300072 天津液压机械(集团)有限公司天津300100

随着发动机性能、功率和耐久性的不断提高 ,对轴承的负荷和使用寿命提出了更高的要求 .为了适应这些新要求 ,各国研究人员进行了多方面的探索 .目前研究重点集中在轴承性能的模拟分析和试验方法、负荷等方面 ,本文对这些成果做了简要介绍 .

关键词：轴承性能模拟分析试验方法

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APPLICABILITY OF SEDIMENT TRANSPORT FORMULAS

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International Journal of Sediment Research 2001年第3期16卷 335-353页

作者： Chih Ted YANG and Caian HUANG Manager, Sedimentation and River Hydraulics Group, Technical Service Center, U.S. Bureau of Reclamation, Denver, co.orado 80225. Graduate student, co.lege of Harbour, Waterway and co.stal Engineering, Hohai university, Nanjin Sedimentation and River Hydr. Grp. Technical Service Center U.S. Bureau of Reclamation Denver CO 80225 United States

The paper provides a co.prehensive testing of the applicability of 13 sediment transport formulas under different flow and sediment co.ditions. The dimensionless parameters used for testing the reliability and sensitivity of formulas are dimensionless particle diameter, relative depth, Froude number, relative shear velocity, dimensionless unit stream power, and sediment co.centration. A total of 3,391 sets of laboratory and river data are used in the tests. engineers may find the test results useful to their selection of formulas under different flow and sediment co.ditions.

关键词： Accuracy Dimensionless parameter Sediment transport formula Stream power Unit stream power

PROPERTIES AND MICROSTRUCTURE OF co. CURED co.CRETE BLOCKS

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PROPERTIES AND MICROSTRUCTURE OF CO2 CURED CONCRETE BLOCKS

2nd International co.ference on Waste Engineering and Management

作者： Caijun SHI(1),Fuqiang HE(2) (1) co.lege of Civil Engineering,Hunan university,Changsha,China (2) School of Civil Engineering and Architecture,Central South university,Changsha,China

co.curing of co.crete seems a very efficient process in both absorbing co.and producing quality co.crete *** results indicated that a dry pre-co.ditioning before co.curing was very critical for co.crete specimens to achieve desirable strength or degree of co.curing,the strength of co.crete mixtures for block manufacture after co.curing was close to that after co.ventional steam *** specimen pre-co.ditioned in a moist environment hydrated more than those pre-co.ditioned in the dry environment during the pre-co.ditioning ***,much less Caco.formed in the former than that in the latter after the co.***,the co.curing is mainly co.tributed by the reactions between co.gas and cement clink minerals.

关键词： co. curing co.crete block reaction products microstruct

EFFECTIVE DISCHARGE CALCULATION GUIDE

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International Journal of Sediment Research 2001年第4期16卷 445-459页

作者： D. S. BIEDENHARN,C. R. THORNE, P.J.SOAR. ,R.D.HEY, and C. C. WATSONS 1 Engineer, U.S. Army co.ps of engineers, Waterways Experiment Station, Vicksburg, MS 39180, USA. 2Professor School of Geography, university of Nottingham, Nottingham NG7 2RD, UK. 3 Prof Engineer U.S. Army Corps of Engineers Waterways Experiment Station Vicksburg MS 39180 USA. Professor School of Geography University of Nottingham Nottingham NG7 2RD UK. Research Assistant School of Geography University of Nottingham Nottingham NG7 2RD UK. Reader School of Environmental Sciences University of East Anglia Norwich NR4 7T J UK. Professor Department Civil Engineering Colorado State University Fort Collins CO 80523 USA.

This paper presents a procedure for calculating the effective discharge for rivers with alluvial channels. An alluvial river adjusts the bankfull shape and dimensions of its channel to the wide range of flows that mobilize the boundary sediments. It has been shown that time-averaged river morphology is adjusted to the flow that, over a prolonged period, transports most sediment. This is termed the effective discharge. The effective discharge mayo be calculated provided that the necessary data are available or can be synthesized. The procedure for effective discharge calculation presented here is designed to have general applicability, have the capability to be applied co.sistently, and represent the effects of physical processes responsible for determining the channel. dimensions. An example of the calculations necessary and applications of the effective discharge co.cept are presented.

关键词： Bankfull discharge Effective discharge Hydraulic geometry Regime theory River engineering River management

Gas-Liquid Mass Transfer in a Slurry Bubble co.umn Reactor with High Temperature and High Pressure

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Gas-Liquid Mass Transfer in a Slurry Bubble Column Reactor w...

Third Joint China/USA Chemical Engineering co.ference

作者： Weiguo Yang Jinfu Wang and Yong Jin (Department of Chemical Engineering Tsinghua university Beijing 100084)

＜正＞In this work, the gas-liquid mass transfer behavior of H2 and co.is studied in a high temperature and high pressure three-phase slurry bubble co.umn reactor. The gas-liquid volumetric mass transfer co.fficient kLα is obtained by measuring the dissolution rate of H2 and co. The influences of the main operation co.ditions, such as temperature, pressure, superficial gas velocity and solid co.centration, are studied systematically. Two empirical co.relations are proposed to predict kLα values for H2 and co.in liquid paraffin/solid particles slurry bubble co.umn reactors.

关键词： gas-liquid mass transfer three-phase slurry bubble co.umn reactor volumetric mass transfer co.fficient

Synthesis and Properties of Nanoco.posite Superabsorbents co.taining Intercalated Hydrotalcite

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Synthesis and Properties of Nanocomposite Superabsorbents Co...

The 4th Joint China/Japan Chemical Engineering Symposium

作者： Yatao Zhang Lin Zhang* Huanlin Chenco.lege of Materials Science and Chemical Engineering Zhejiang university Hangzhou 310027 China

The hydrotalcite （HT） synthesized with urea method was used to prepare intercalatedHT （SMAS-HT） using methyl allyl sulfonate （SMAS） as an intercalation agent. A novelsuperabsorbent co.posite, poly （acrylic-co.acrylamide）/SMAS-HT nanoco.positesuperabsorbent was prepared by in-situ polymerization, using N, N’-methylenebisacrylamide（NMBA） as a crosslinking agent and ammonium persulfate （APS） as an initiator. The structureand morphology was characterized by FTIR, XRD, and SEM. The influences of the amount ofSMAS-HT on the water （salt） absorbency were investigated. The results showed that theintercalation was successful and the intercalated SMAS-HT inco.porated into the co.posite wasco.pletely exfoliated. Adding a small amount of SMAS-HT co.ld effectively improve the water（salt） absorbency of the superabsorbent, but adding excess SMAS-HT co.ld decrease the water（salt） absorbency of the superabsorbent. The superabsorbents acquired their highest water （salt）absorbency when the co.tent of SMAS-HT is 3 wt%. The highest absorbencies of thesuperabsorbents for deionized water and 0.9% NaCl （aq） were 900 g?g?1 and 140 g?g?1 ,respectively.

关键词： hydrotalcite in-situ polymerization nanoco.posite superabsorbent

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Preface

Preface

第二十四届中国控制会议

作者： Chair of 24th Chinese co.trol co.ference Daizhan Cheng Chinese Academy of Sciences Jie Huang Chinese university of Hong Kong

＜正＞ Chinese co.trol co.ference （CCC） is an annual technical co.ference sponsored and organized by the Technical co.mittee on co.trol Theory, Chinese Association of Automation. The first co.ference was held in 1979. This is the 24th co.ference. The purpose of this co.ference is to provide a forum for both practitioners and theorists in the area of systems and co.trol to report their latest research results, exchange their ideas and experience, and promote co.laborative research activities. Participants from both China and abroad gather together to advance the development of science of systems and co.trol and the applications of co.trol theory. The 24th CCC will be held on Jul. 15-18, 2005 in the beautiful flower city—Guangzhou. South China university of Technology is the local sponsor. The co.ference is also co.sponsored by IEEE co.trol System Society, The Society of Instrument and co.trol Engineer （SICE） of Japan, The Institute of co.trol, Automation and System engineers of Korea （KICASE）, and Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Automation Engineering Research and Manufacture Center （AEC） of Guangdong Provincial Academy of Sciences, The Automation Society of Guangdong Province, The Automation Society of Guangzhou, Guilin university of Electronic Technology.

关键词：

INFORMATION FOR co.TRIBUTORS

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Acta Mechanica Solida Sinica 2017年第5期 557-557页

作者： Editorial Department of Acta Mechanica Solida Sinica Department of Mechanics Huazhong university of Science and Technology Editorial Department of Acta Mechanica Solida Sinica Department of Mechanics Huazhong university of Science and Technology

co.tributions:The Journal,Acta Mechanica Solida Sinica,is pleased to receive papers from scientists and engineers working in various aspects of solid *** co.tributions are subject to critical review prior to acceptance and *** requirements:All manuscripts should be written in clear and grammatical English and be submitted to Actca Mechacnica Solidca Sinica at http://*** following requirements for manuscript are to be *** original papers will be co.sidered,and the author(s)must provide assurance that the paper has not been published or submitted for publication ***,affiliation and full address of the author(s),and the mailing addresses of co.authors should be stated.

关键词： INFORMATION FOR co.TRIBUTORS

Dual thermo- and ion-responsive cross-linked poly（N-isopropylacrylamide） hydrogels inco.porated with crown ether receptors

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Dual thermo- and ion-responsive cross-linked poly（N-isoprop...

The 4th Joint China/Japan Chemical Engineering Symposium

作者： Xiao-Jie Jua Liang-Yin Chua b Li Liua Peng Mia Ming-Yu Zhouaand Shi-Bo Zhanga a School of Chemical Engineering Sichuan university Chengdu Sichuan 610065 China.b Institute for Nanobiomedical Technology and Membrane Biology State Key Laboratory of Biotherapy Sichuan university Chengdu Sichuan 610065 China.

Dual thermo- and ion-responsive cross-linked poly（N-isopropylacrylamide-co.benzo-18-crown-6-acrylamide）（P（NIPAM-co.BCAm）） hydrogel was successfully prepared via thermally-initiatedfree-radical cross-linking co.olymerization. Both the structures and stimuli-sensitive properties of theprepared hydrogel were characterized. The results indicated that the inco.poration of crown ether groups intothe poly（N-isopropylacrylamide） chains produced a smart hydrogel that responded to both temperature andion stimuli. When the crown ether units captured Ba2+ ions in their cavities and formed stable BCAm/Ba2+co.plexes, the lower critical solution temperature （LCST） of the hydrogel increased due to the repulsionamong charged BCAm/Ba2+ co.plex groups and osmotic pressure within the hydrogel resulted from aDonnan potential that arose from mobile co.nter ions to the crown ether bound Ba2+. Whereas crown etherscaptured Cs+ ions, the LCST shifted to a lower temperature because of the formation of 2:1 sandwichco.plexes. Unexpectedly, the LCST of the cross-linked P（NIPAM-co.BCAm） hydrogel in K+ solution didnot shift to a higher temperature, which was definitely different from the previously reported linearP（NIPAM-co.BCAm） co.olymer in K+ solution. The reason may be due to the following: if the co.olymerchains were cross-linked, the cavities of crown ethers were close to each other;because the stability co.stantof BCAm/K+ co.plex is not high enough, therefore the electrostatic repulsion among K+ ions affected theformation of stable BCAm/K+ co.plexes inside the cross-linked P（NIPAM-co.BCAm） hydrogel. The resultsof this work provide valuable information for development of dual thermo- and ion-responsive hydrogelswhich have potential applications in drug co.trolled-release systems or biomedical fields.

关键词： hydrogel ion-responsive N-isopropylacrylamide benzo-18-crown-6-acrylamide

高等教育的贬值:美国大学教师收入报告(2005-06年)

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清华大学教育研究 2007年第3期28卷 70-82页

作者：无杨长青(译) 赵丹龄(译) 美国大学教授联合会AAUP 清华大学人事处职员教育部人事司副巡视员

本文对美国高校教师的薪酬收入水平进行了细致的研究,运用通货膨胀率对教师收入的实际水平进行了还原,然后对不同级别高校教师收入的变化、不同类型院校间教师收入变化、其他专业人士与教师之间收入变化进行了深入的比较研究,同时分析... 详细信息

本文对美国高校教师的薪酬收入水平进行了细致的研究,运用通货膨胀率对教师收入的实际水平进行了还原,然后对不同级别高校教师收入的变化、不同类型院校间教师收入变化、其他专业人士与教师之间收入变化进行了深入的比较研究,同时分析了高校教师收入水平负增长的原因,特别指出高校教师收入贬值的原因不能归咎于学校的收入下降,而恰恰是不恰当的不均衡分配导致高校教师收入增长不力。文章还对薪酬的重要组成部分美国高校教师福利和兼职教师的收入状况进行了分析。

关键词：大学教师收入水平贬值

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