检索结果-南通市图书馆

Studies on the Displacement Reaction of Trialkylaluminum with Ethylene Catalyzed by Nitrogen Chelate Cobalt Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2003年第2期14卷 135-137页

作者： Bin ZHOU ren he State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116012

The catalytic properties of a series of cobalt complexes containing bidenated nitrogen ligand for displacement reaction of trialkylaluminum with ethylene is reported. Effect of different reaction time, temperature an... 详细信息

关键词： Ethylene displacement reaction trialkylaluminum cobalt complex.

Targeting chemokines/chemokine receptors:a promising strategy for enhancing the immunotherapy of pancreatic ductal adenocarcinoma

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2020年第1期5卷 1156-1157页

作者： Ruining Gong he ren Department of Gastroenterology Center of Tumor Immunology and CytotherapyMedical Research Center of The Affiliated Hospital of Qingdao University266003 QingdaoChina

In recent study published on Nature Medicine,Bockorny et al.1 performed a single-arm phase IIa trial(COMBAT study,NCT02826486)to evaluate safety,efficacy,immunobiological changes,and potential biomarkers for the CXCR4 inhibitor BL-8040,combined with a PD-1 antagonist(pembrolizumab)as a second-line or third-line treatment for patients with metastatic *** evidence translates the theory of reprogramming tumor immunosuppressive microenvironment into clinical practice and supports that targeting chemokines/chemokine receptors facilitates the immunotherapy of pancreatic ductal adenocarcinoma(Fig.1).

关键词： chemokine adenocarcinoma immunotherapy

胶原蛋白肽-焦磷酸铁复合物的构建及其补铁效果评价

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

陕西科技大学学报 2025年第1期43卷 29-34页

作者：刘宁王薇贺人杰姚晓琳张琨福格森(武汉)生物科技股份有限公司湖北武汉430056 陕西科技大学食品科学与工程学院陕西西安710021

铁复合物是一种将铁元素与食品大分子结构进行组装的新型铁强化剂,具有化学稳定性和生物利用度高的优点.本课题采用均质、超声和透析处理,在焦磷酸铁(FP)的合成过程中,引入胶原蛋白肽(CPs).红外光谱测定发现,该方法成功制得CPs-FP复合物... 详细信息

铁复合物是一种将铁元素与食品大分子结构进行组装的新型铁强化剂,具有化学稳定性和生物利用度高的优点.本课题采用均质、超声和透析处理,在焦磷酸铁(FP)的合成过程中,引入胶原蛋白肽(CPs).红外光谱测定发现,该方法成功制得CPs-FP复合物.与FP相比,CPs-FP的胃肠释放率提高.缺铁性贫血大鼠实验表明,CPs-FP能够有效改善大鼠体重、血红蛋白含量、组织铁含量和其他指数,呈现浓度依赖效应.同等剂量下,CPs-FP复合物具有更高的生物利用度.

关键词：焦磷酸铁胶原蛋白肽铁复合物胃肠消化缺铁性动物

维普期刊数据库博看期刊

Natural and human-induced changes in summer climate over the East Asian monsoon region in the last half century: A review

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2015年第2期6卷 131-140页

作者： ZHANG ren-he State Key Laboratory of Severe Weather (La SW) Chinese Academy of Meteorological Sciences

In the last half century,a significant warming trend occurred in summer over eastern China in the East Asian monsoon ***,there were no consistent trends with respect to the intensity of the East Asian summer monsoon(EASM) or the amount of summer rainfall averaged over eastern *** of the EASM and summer rainfall exhibited clear decadal *** decadal shifts of EASM occurred around the mid- and late 1970 s,the late 1980 s and the early 1990 s,and the late 1990 s and early 2000 s,*** rainfall over eastern China exhibited a change in spatial distribution in the decadal timescale,in response to the decadal shifts of *** the mid- and late 1970 s to the late 1980 s and the early 1990 s,there was a meridional tri-polar rainfall distribution anomaly with more rainfall over the Yangtze River valley and less rainfall in North and South China; but in the period from the early 1990 s to the late 1990 s and the early 2000 s the tri-polar distribution changed to a dipolar one,with more rainfall appearing over southern China south to the Yangtze River valley and less rainfall in North ***,from the early 2000 s to the late 2000 s,the Yangtze River valley received less *** decadal changes in EASM and summer rainfall over eastern China in the last half century are closely related to natural internal forcing factors such as Eurasian snow cover,Arctic sea ice,sea surface temperatures in tropical Pacific and Indian Ocean,oceaneatmospheric coupled systems of the Pacific Decadal Oscillation(PDO) and AsianePacific Oscillation(APO),and uneven thermal forcing over the Asian *** to now,the roles of anthropogenic factors,such as greenhouse gases,aerosols,and land usage/cover changes,on existing decadal variations of EASM and summer rainfall in this region remain uncertain.

关键词： East Asian summer monsoon Summer rainfall over eas

Modeling and Experimental Study of Relay Valve of Tractor-Semitrailer

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2019年第4期28卷 819-824页

作者： Zhecheng Jing ren he Jianqing he Bingliang Shi School of Automotive and Traffic Engineering Jiangsu UniversityZhenjiang 212013China Army Research Institute of PLA Beijing 102202China

An improved modeling methodology,considering heat change,friction and inertia of components,is *** relay valve used in tractor-semitrailers is taken as an example to develop the mathematical *** resulting simulation for time lag,developed based on this model,is validated by *** results show that the time lag of this relay valve is 0.12.s while the experimental value is 0.131.s,which means that the response time can be simulated *** comparison between simulation and experiment also shows that the main factor affecting the response time of the relay valve is the movement time of the internal piston and valve *** results indicate that the model of the relay valve is effective,and the modeling methodology is *** research could provide reference for related studies.

关键词： tractor-semitrailer air brake system relay valve modeling

Selective oxidation of ethylbenzene catalyzed by fluorinated metalloporphyrins with molecular oxygen

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第9期18卷 1053-1056页

作者： Xiao Gang Li Jing Wang ren he State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 China

This paper reported the oxidation of ethylbenzene catalyzed by fluorinated metalloporphyrins under mild conditions without any additives. The results showed that the cobalt(II)(5,10,15,20-tetrakis(pentafluorophenyl))porphyrin was the best catalyst among the fluorinated metalloporphyrins. The conversion of ethylbenzene reached 38.6%, the selectivity to acetophenone reached 94.0%, and the turnover number is 2719 under the optimal conditions.

关键词： Fluorinated metalloporphyrin Oxidation Molecular oxygen Ethylbenzene

Friedmann Cosmology with a Generalized Equation of State and Bulk Viscosity

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第2期47卷 379-384页

作者： MENG Xin-he ren Jie HU Ming-Guang Department of Physics Nankai University Tianjin 300071 China

The universe content is considered as a non-perfect fluid with bulk viscosity and is described by a more general equation of state （endowed some deviation from the conventionally assumed cosmic perfect fluid model）. We assume the bulk viscosityis a linear combination of two terms： one is constant, and the other is proportional to the scalar expansion 0 = 3a/a. The equation of state is described as p = （γ - 1）p ＋ po, where po is a parameter. In this framework we demonstrate that this model can be used to explain the dark energy dominated universe, and different proper choices of the parameters may lead to three kinds of fates of the cosmological evolution： no future singularity, big rip, or Type-Ⅲ singularity as presented in IS. Nojiri, S.D. Odintsov, and S. Tsujikawa, Phys. Rev. D 71 （2005） 063004].

关键词： Friedmann cosmology equation of state bulk viscosity dark energy

Ethylene Oligomerization by (dppe)MCl_2 [M = Fe(II), Co(II),Ni(II)] Complexes/EAO

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第12期12卷 1115-1118页

作者： Yu Liang ZHANG Ming Xing QIAN ren he State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116012

The catalytic properties of a series of (dppe) MCl2 [M = Fe(II), Co(II), Ni(II)] in combination with EAO (ethylaluminoxane) for ethylene oligomerization have been investigated. Treatment of the bidentate phosphine metal complexes with EAO in toluene generated in situ active catalysts which catalyze oligomerizaton of ethylene to low-carbon olefins. The effects of reaction temperature, ratios of n(Al) : n(M) and reaction periods on catalytic activity and product distribution have been studied. The activity of cobalt complex with EAO at 200C was 4021 g/g(Co)h, and the selectivity of C4-10 olefins is 95.5%.

关键词： Ethylene oligomerization bidentate phosphine complexes EAO a-olefins.

Synthesis and Characterization of Amphiphific Block Copolymer Containing PVP and Poly（5-benzyloxytrimethylene carbonate）

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第2期17卷 239-242页

作者： Ying Xia WANG Feng he ren Xi ZHUO Key Laboratory of Biomedical Polymers of Ministry of Education Department of Chemistry Wuhan University Wuhan 430072

Amphiphilic copolymer of 5-benzyloxytrimethylene carbonate （BTMC） with poly （vinyl pyrrolidone）（PVP） was successfully synthesized using immobilized porcine pancreas lipase （IPPL） or SnOct2 as catalyst. Hydroxyl terminated PVP, synthesized with 2-mercaptoethanol as a chain transfer reagent, was employed as a rnacroinitiator. The resulting copolymers were characterized by GPC, ^1H NMR and IR. Increasing the BTMC/PVP-OH feed ratio （[B]/[P]） resulted in the increase of Mn of corresponding copolymers and the decrease of Mw/Mn. Immobilized enzyme has comparable catalytic activity to SnOct2 for the copolymerization.

关键词： Amphiphilic copolymer end-functionalized PVP 5-benzyloxytrimethylene carbonate,immobilized enzyme ring-opening polymerization macroinitiator.