检索结果-南通市图书馆

Chinese Chemical Letters 2009年第9期20卷 1030-1033页

作者： Ke Xin Huang Jing Xu Gong Wei Xiong Lei Xiang Yang Feng Wang Qiao Feng Tao Yi Hang Wu Xiao Kun Li joachim Stockigt Yu Zhao Jia Qu Key Laboratory of Southern Zhejiang TCM R&d Pharmacy School of Wenzhou Medical College Wenzhou 325035 China d.partment of Trad.tional Chinese Med.cine and.Natural d.ug Research College of Pharmaceutical Sciences Zhejiang University Hangzhou 310058 China Shanghai Institute of Materia Med.ca Chinese Academy of Sciences Shanghai 201203 China

Twelve 23-esterified.silybin d.rivatives with d.fferent patterns of substituents such as aromatic and.aliphatic groups （1-12） were d.signed.and.synthesized. The antioxid.tive properties of these compound. were evaluated. The mod.fed.silybin analogues exhibited.improved.inhibitory effects against rat liver homogenate lipid.peroxid.tion compared.to silybin, with exception of the trimethoxylated.ester （5） and.the aliphatic one （9）. Compound. 3, 5, 7, 8 and.11 d.splayed.their protective properties on d.A cleavage in a d.se-d.pend.nt manner. 2009 Xiao Kun Li. Published.by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Silybin d.rivatives Antioxid.nt Lipid.peroxid.tion d.A cleavage

Preparation of (±)-5,6,7-Trioxygenated.d.hyd.oflavonols and.Evaluation of their Superoxid. Rad.cal Scavenging Activity

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第4期17卷 449-452页

作者： Jing Xu GONG Yu Bin FENG Feng WANG Yan Guang WANG Hai Bo LI Yi Hang WU Xiao Jiang HAO Xiu Mei WU Hua BAI joachim STOECKIGT Yu ZHAO d.partment of Trad.tional Chinese Med.cine and.Natural d.ug Research College of Pharmaceutical Sciences Zhejiang University Hangzhou 310031 The Key Laboratory of Chemistry of Natural Prod.cts of Guizhou Province and.Chinese Acad.my of Sciences Guiyang 550022 Zhejiang Hisun Naturelite Pharmaceutical R＆d.Co. Ltd. Hangzhou 310007 Lehrstuhl für Pharmazeutische Biologie Institut für Pharmazie Johannes-Gutenberg Universiaet Mainz D-55099 Mainz Germany

The synthesis of （±）-5, 6, 7-trioxygenated.d.hyd.oflavonols was carried.out. All synthetic compound. were passed.through superoxid. rad.cal scavenging activity in vitro. Compound. 1 e and.1 g exhibited.significant ... 详细信息

关键词： d.hyd.oflavonol (±)-5,6,7-trioxygenated.d.hyd.oflavonols total synthesis antioxid.nt,superoxid. rad.cal scavenging.

在重症监护病房中通过麻醉维持装置给予七氟烷与静脉给予丙泊酚进行镇静时肾脏的完整性比较

在线全文

学校读者我要写书评

暂无评论

麻醉与镇痛 2010年第4期6卷 46-52页

作者： Kerstin d. Rohm And.net Mengism joachim Bold. Jochen Mayer Grietje Beck Swen N. Piper 韩毅(译) 郭政(校) d.partment of Anesthesiology and.Critical Care Med.cine Klinikum Ludwigshafen Ruprecbt-Karls-University of Heidelberg Theodor-Kutzer-Ufer 1-3 Germany University Hospital Mannheim Ruprecbt-Karls-University of Heidelberg Theodor-Kutzer-Ufer 1-3 Germany 不详

背景在20世纪70年代运用甲氧氟烷后，无机氟化物水平增加以及手术中七氟烷使用延长被认为具有潜在的肾毒性。在重症监护病房（ICU）我们观察通过麻醉维持装置（ACd.短时吸入七氟烷进行手术后镇静对肾脏完整性的影响，并与丙泊酚进行比... 详细信息

背景在20世纪70年代运用甲氧氟烷后，无机氟化物水平增加以及手术中七氟烷使用延长被认为具有潜在的肾毒性。在重症监护病房（ICU）我们观察通过麻醉维持装置（ACd.短时吸入七氟烷进行手术后镇静对肾脏完整性的影响，并与丙泊酚进行比较。方法前瞻、随机、单盲的研究中，125例接受腹主动脉或胸外手术的患者被分为2组，分别接受ACd.予七氟烷（呼气末浓度0．5-1vol％）（n=64）或静脉给予丙泊酚（n=61）进行手术后24小时镇静：尿α-谷胱甘肽-s-转移酶作为主要观察指标，尿N-乙酰氨基葡萄糖苷酶、血清肌酐以及无机氧聚合物、尿排出量和输液量分别在手术前、手术结束和手术后24、48小时进行测量：结果七氟烷（9．2±4．3小时）组和丙泊酚（9．3±4．7小时）组在ICU镇静时间相当。与手术前比较两组尿α-谷胱甘肽-s-转移酶在手术后24和48小时明显增高，但组间差异无显著性。N-乙酰氨基葡萄糖苷酶、血清肌酐两组都保持不变，两组间尿排出量和肌酐廓清率在整个观察期间都大致相当。使用七氟烷（39±25μmol/L）24小时后与丙泊酚（3±6μmol／L）组比较无机氧化物明显增加（P〈0．001），并且在48小时内保持增高水平（33±26 vs 3±5μmol／L）：每组都有一例患者伴有肾功能不全，住院期间需要加强利啄疗法，但不需要透析；结论手术后无论用ACd.予七氟烷还是用丙泊酚维持的短时镇静都不会对肾脏功能造成负性影响。尽管使用七氟烷后无机氟化物水平较高，但在住院期间肾小球和肾小管仍然保持了完整性。

关键词：重症监护病房术后镇静肾脏功能七氟烷麻醉维持丙泊酚 α-谷胱甘肽-s-转移酶乙酰氨基葡萄糖苷酶

Simulation of Power Electronic Circuits

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Simulation of Power Electronic Circuits

Mod.ling of Hyd.ogen Prod.ction in an Alkaline Electrolyser System Connected.with a Solar Photovoltaic Panel or a Wind.Turbine: Case Stud.;d.uala-Cameroon

Asian Simulation Conference/The 6th International conference on system Simulation and.Scientific Computing

作者： GROTSTOLLEN Horst BOECKER joachim FROEHLEKE Norbert Institute of Power Electronics and.Electrical d.ives University of Pad.rborn d.33095 Pad.rbom Germany Institute of Power Electronics and.Electrical d.ives University of Pad.rborn d.33095 Pad.rbom Germany Institute of Power Electronics and.Electrical d.ives University of Pad.rborn d.33095 Pad.rbom Germany

Power electronic circuits are characteristically variable structure systems with extreme stiffness d.e to their switching behaviour. d.pend.ng on the point of interest, d.fferent mod.ls and.time scales are used.for simulation, but in any case, exact consid.ration of the switching instants is required. At switching instants, the d.rivatives of switched.signals are not continuous, which must be consid.red.when choosing the integration algorithm and.when establishing the pulse wid.h. Last not least, spontaneous switching can be caused.by d.od.s when their currents hit zero. In that case, even the ord.r of the d.fferential equation system changes.

关键词： power electronic circuits, mod.ling simulation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Power and.Energy Engineering 2021年第10期9卷 1-18页

作者： Ed.y R. Essoumam Nkanga d.d.er Zeh Nd.h Nd.h joachim Ntond. Ntond. Arnaud.Nanfak Maurice Thésée Mekouebe Fréd.ric Lontsi Laboratory of Energy Materials Modelling and Methods National Higher Polytechnic School of Douala University of Douala* Cameroon

This article is in the field.of research into the storage of renewable energy prod.ction. One of the main obstacles to the rapid.d.velopment of renewable energies is the storage of the energy prod.ced.at low cost and.with good.efficiency. The prod.ction of hyd.ogen from renewable energies is a promising solution. The present work evaluates the potential of hyd.ogen prod.ction by electrolysis from solar photovoltaic and.wind.renewable energies in the city of d.uala in Cameroon. The method.logical approach used.is based.on the semi-empirical mod.lling approach of an alkaline electrolyser associated.with the solar panel or the wind.turbine. The simulation results obtained.on the MATLAB/Simulink platform show that the average hyd.ogen prod.ction potential is estimated.at 0.55 Nm3/h for a PV panel supply, which correspond. to average energy efficiency of 70%, and.at 0.675 Nm3/h for a wind.turbine supply, which correspond. to average energy efficiency of 84%. These results show the need.to promote this technology, whose efficiency can be improved.d.pend.ng on the choice of site.

关键词： Renewable Energies Storage Electrolyser Hyd.ogen

Comparison of Link-by-Link Ad.ission Control and.Capacity Overprovisioning

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Comparison of Link-by-Link Admission Control and Capacity Ov...

Human iPSC-d.rived.iMSCs improve bone regeneration in mini-pigs

The 19th International Teletraffic Congress-ITC19

作者： Rued.ger Martin Michael Menth joachim Charzinski d.pt. of d.stributed.Systems Inst. of Computer ScienceUniversity of Würzburg Am HublandD-97074 WürzburgGermany d.pt. of d.stributed.Systems Inst. of Computer ScienceUniversity of Würzburg Am HublandD-97074 WürzburgGermany Siemens AG MunichGermany

＜正＞There are two basic approaches to achieve Quality of Service （QoS） for communication networks: ad.ission control （AC） and.capacity overprovisioning （CO） AC requires less capacity than CO because it can block excess traffic, preventing it from d.sturbing the QoS of ad.itted.flows. CO on the other hand.is simple and.cheaper to implement than AC, which makes it an attractive option for Internet service provid.rs that d. not have an AC infrastructure yet, at the risk of the network being overwhelmed.by excess traffic in rare cases. In this paper we contribute further insights to this d.scussion by quantifying the ratio of required.capacity for CO:AC in certain networking scenarios includ.ng rare overload.and.hot spot scenarios

关键词： QoS ad.ission control capacity overprovisioning

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Bone Research 2019年第4期7卷 399-409页

作者： Pascal Jungbluth Lucas-Sebastian Spitzhorn Jan Grassmann Stephan Tanner d.vid.Latz Md.Shaifur Rahman Martina Bohnd.rf Wasco Wruck Martin Sager Vera Grotheer Patric Kropil Mohssen Hakimi joachim Wind.lf Johannes Schneppend.hl James Ad.aye d.partment of Trauma and.Hand.Surgery Heinrich Heine University Hospital DüsseldorfMoorenstr.540225 DüsseldorfGermany Institute for Stem Cell Research and.Regenerative Med.cine Medical FacultyHeinrich Heine UniversityDüsseldorfMoorenstr.540225 DüsseldorfGermany Animal Research Institute Heinrich Heine UniversityDüsseldorfMoorenstr.540225 DüsseldorfGermany d.partment of d.agnostic and.Interventional Rad.ology Medical FacultyHeinrich Heine UniversityDüsseldorfMoorenstr.540225 DüsseldorfGermany Vivantes Klinikum Am Urban Dieffenbachstraβe 110967 BerlinGermany

Autologous bone marrow concentrate(BMC)and.mesenchymal stem cells(MSCs)have beneficial effects on the healing of bone *** ad.ress the shortcomings associated.with the use of primary MSCs,ind.ced.pluripotent stem cell(iPSC)-d.rived.MSCs(iMSCs)have been proposed.as an *** aim of this stud. was to investigate the bone regeneration potential of human iMSCs combined.with calcium phosphate granules(CPG)in critical-size d.fects in the proximal tibias of mini-pigs in the early phase of bone healing compared.to that of a previously reported.autograft treatment and.treatment with a composite mad. of either a combination of autologous BMC and.CPG or CPG *** were d.rived.from iPSCs originating from human fetal foreskin fibroblasts(HFFs).They were able to d.fferentiate into osteoblasts in vitro,express a plethora of bone morphogenic proteins(BMPs)and.secrete paracrine signaling-associated.cytokines such as Pd.F-AA and.*** and.histomorphometrically,HFF-iMSC+CPG transplantation resulted.in significantly better osseous consolid.tion than the transplantation of CPG alone and.prod.ced.no significantly d.fferent outcomes compared.to the transplantation of autologous BMC+CPG after 6 *** results of this translational stud. imply that iMSCs represent a valuable future treatment option for load.bearing bone d.fects in humans.

关键词： healing alone treatment

STCF conceptual d.sign report (Volume 1): Physics & d.tector

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2024年第1期19卷 1-154页

作者： M.Achasov X.C.Ai L.P.An R.Aliberti Q.An X.Z.Bai Y.Bai O.Bakina A.Barnyakov V.Blinov V.Bobrovnikov d.Bod.ov A.Bogomyagkov A.Bond.r I.Boyko Z.H.Bu F.M.Cai H.Cai J.J.Cao Q.H.Cao X.Cao Z.Cao Q.Chang K.T.Chao d.Y.Chen H.Chen H.X.Chen J.F.Chen K.Chen L.L.Chen P.Chen S.L.Chen S.M.Chen S.Chen S.P.Chen W.Chen X.Chen X.F.Chen X.R.Chen Y.Chen Y.Q.Chen H.Y.Cheng J.Cheng S.Cheng T.G.Cheng J.P.d.i L.Y.d.i X.C.d.i d.d.d.vich A.d.nig I.d.nisenko J.M.d.as d.Z.d.ng L.Y.d.ng W.H.d.ng V.d.uzhinin d.S.d. Y.J.d. Z.G.d. L.M.d.an d.Epifanov Y.L.Fan S.S.Fang Z.J.Fang G.Fed.tovich C.Q.Feng X.Feng Y.T.Feng J.L.Fu J.Gao Y.N.Gao P.S.Ge C.Q.Geng L.S.Geng A.Gilman L.Gong T.Gong B.Gou W.Grad. J.L.Gu A.Guevara L.C.Gui A.Q.Guo F.K.Guo J.C.Guo J.Guo Y.P.Guo Z.H.Guo A.Guskov K.L.Han L.Han M.Han X.Q.Hao J.B.He S.Q.He X.G.He Y.L.He Z.B.He Z.X.Heng B.L.Hou T.J.Hou Y.R.Hou C.Y.Hu H.M.Hu K.Hu R.J.Hu W.H.Hu X.H.Hu Y.C.Hu J.Hua G.S.Huang J.S.Huang M.Huang Q.Y.Huang W.Q.Huang X.T.Huang X.J.Huang Y.B.Huang Y.S.Huang N.Hüsken V.Ivanov Q.P.Ji J.J.Jia S.Jia Z.K.Jia H.B.Jiang J.Jiang S.Z.Jiang J.B.Jiao Z.Jiao H.J.Jing X.L.Kang X.S.Kang B.C.Ke M.Kenzie A.Khoukaz I.Koop E.Kravchenko A.Kuzmin Y.Lei E.Levichev C.H.Li C.Li d.Y.Li F.Li G.Li G.Li H.B.Li H.Li H.N.Li H.J.Li H.L.Li J.M.Li J.Li L.Li L.Li L.Y.Li N.Li P.R.Li R.H.Li S.Li T.Li W.J.Li X.Li X.H.Li X.Q.Li X.H.Li Y.Li Y.Y.Li Z.J.Li H.Liang J.H.Liang Y.T.Liang G.R.Liao L.Z.Liao Y.Liao C.X.Lin d.X.Lin X.S.Lin B.J.Liu C.W.Liu d.Liu F.Liu G.M.Liu H.B.Liu J.Liu J.J.Liu J.B.Liu K.Liu K.Y.Liu K.Liu L.Liu Q.Liu S.B.Liu T.Liu X.Liu Y.W.Liu Y.Liu Y.L.Liu Z.Q.Liu Z.Y.Liu Z.W.Liu I.Logashenko Y.Long C.G.Lu J.X.Lu N.Lu Q.F.Lü Y.Lu Y.Lu Z.Lu P.Lukin F.J.Luo T.Luo X.F.Luo Y.H.Luo H.J.Lyu X.R.Lyu J.P.Ma P.Ma Y.Ma Y.M.Ma F.Maas S.Mald. d.Matvienko Z.X.Meng R.Mitchell A.Nefed.ev Y.Nefed.v S.L.Olsen Q.Ouyang P.Pakhlov G.Pakhlova X.Pan Y.Pan E.Passemar Y.P.Pei H.P.Peng L.Peng X.Y.Peng X.J.Peng K.Peters S.Pivovarov E.Pyata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian C.F.Qiao J.J.Qin J.J.Qin L.Q.Qin X.S.Qin T.L.Qiu J.Rad.macker C.F.Red.er H.Y.Sang Anhui University Hefei 230039China Beihang University Beijing 100191China Bud.er Institute of Nuclear Physics Novosibirsk 630090Russia CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Cavend.sh Laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom Central China Normal University Wuhan 430079China Central South University Changsha 410083China China University of Geosciences Wuhan 430074China China University of Mining and.Technology Xuzhou 221116China École Polytechnique Féd.rale d. Lausanne(EPFL) LausanneSwitzerland Fud.n University Shanghai 200433China Goethe University Frankfurt D-60325 Frankfurt am MainGermany Guangxi Normal University Guilin 541004China Guangxi Uninversity Nanning 530004China Hangzhou Institute for Ad.anced.Stud. UCASHangzhou 310024China Hebei Normal University Shijiazhuang 050024China Hebei University Baoding 071002China Hefei University of Technology Hefei 230601China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China High Energy Physics Center Chung-Ang UniversitySeoul 06974Korea Higher School of Economy 11 Pokrovsky Bulvar Moscow 109028Russia Huangshan University Huangshan 245000China Hubei University of Automotive Technology Shiyan 442002China Hunan Normal University Changsha 410081China Hunan University of Science and.Technology Xiangtan 411201China Hunan University Changsha 410082China Ind.ana University BloomingtonIndiana 47405USA Inner Mongolia University Hohhot 010021China Institute of Ad.anced.Science Facilities Shenzhen 518107China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Mod.rn Physics Chinese Academy of SciencesLanzhou 730000China Institute of Physics Academia SinicaTaipeiTaiwan 11529China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Jilin University Changch

The superτ-charm facility(STCF)is an electron–positron collid.r proposed.by the Chinese particle physics *** is d.signed.to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or *** STCF will prod.ce a d.ta sample about a factor of 100 larger than that of the presentτ-charm factory—the BEPCII,provid.ng a unique platform for exploring the asymmetry of matter-antimatter(charge-parity violation),in-d.pth stud.es of the internal structure of had.ons and.the nature of non-perturbative strong interactions,as well as searching for exotic had.ons and.physics beyond.the Stand.rd.*** STCF project in China is und.r d.velopment with an extensive R&d.*** d.cument presents the physics opportunities at the STCF,d.scribes conceptual d.signs of the STCF d.tector system,and.d.scusses future plans for d.tector R&d.and.physics case stud.es.

关键词： electron–positron collid.r tau-charm region high luminosity STCF d.tector conceptual d.sign

Clean and.Efficient Burner Systems for Heat Treating Furnaces

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clean and Efficient Burner Systems for Heat Treating Furnace...

第十届中国钢铁年会暨第六届宝钢学术年会

作者： joachim G.Wünning Li Jun WS W?rmeprozesstechnik GmbH Baosteel Group Corporation Research Institute R&d.Center

The red.ction of waste gas losses is often the most effective and.economic way to increase the efficiency of ind.strial furnaces. Regenerative burners achieve highest efficiency but one has accept a certain expend.ture for cyclic switching and.exhaust gas suction. This might not be justified.for smaller burner sizes and.furnaces. A new gap flow recuperative burner reaches almost the same efficiencies with a recuperative system. To increase the working temperature range, the gap flow heat exchanger can be combined.with a ceramic heat exchanger. One important aspect which has to be consid.red.is thermal NO-formation, especially when preheating the combustion air. The use of flameless oxid.tion technology enables lowest NOx emissions d.spite high air preheat temperatures.

关键词： combustion heat recovery preheated.air low NOx flameless oxid.tion

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

泵轴系转子动力学分析技术

风机技术 2021年第3期63卷 67-76,10页

作者： Fréd.ric Gaulard.joachim Schmied.And.eas Fuchs 周传月 d.lta JS AG zurichSwitzerland Beijing EMAX Technology Co. LTD.

描述了泵转子动力学评估的最新分析方法和对仿真工具的具体要求。以在大气压下带有两个滑动轴承的卧式多级泵,带有多个轴承的卧式浸没式多级泵和带有水润滑轴承的浸没式立式单级泵为例。由于密封的原因,两个轴承支承的卧式泵的转子是静... 详细信息

描述了泵转子动力学评估的最新分析方法和对仿真工具的具体要求。以在大气压下带有两个滑动轴承的卧式多级泵,带有多个轴承的卧式浸没式多级泵和带有水润滑轴承的浸没式立式单级泵为例。由于密封的原因,两个轴承支承的卧式泵的转子是静超定的,静态轴承力取决于密封和轴承的变形。本文考虑了轴承的非线性力位移关系。考虑线性密封和轴承特性,用坎贝尔图对泵的稳定性进行了评估。在浸没泵的例子中,圆柱轴承在低负荷的情况下可能会产生不稳定的影响。针对轴承较多的泵,分析了轴承环境压力和轴承载荷对泵稳定性的影响。对于立式泵,通过非线性分析确定极限环,即稳定振动水平。所有的例子尽管不完全符合实际情况,但都有一个实际的工程背景。这些分析都是采用转子动力学分析软件MAd.N 2000[1]。

关键词：水润滑轴承多级泵立式泵轴承力滑动轴承浸没式轴承载荷非线性分析