检索结果-南通市图书馆

In situ study of calcite-Ⅲ dimorphism using dynamic diamond anvil cell

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第9期31卷 421-427页

作者： Xia Zhao sheng-hua mei Zhi Zheng Yue Gao Jiang-Zhi Chen Yue-Gao Liu Jian-Guo Sun Yan Li Jian-Hui Sun CAS Key Laboratory for Experimental Study under Deep-sea Extreme Conditions Institute of Deep-sea Science and EngineeringChinese Academy of Sciences(CAS)Sanya 572000China University of Chinese Academy of Sciences Beijing 100049China Department of Mechanical Engineering National University of Singapore(NUS)Singapore 117575Singapore

The phase transitions among the high-pressure polymorphic forms of CaCO_(3)(cc-Ⅰ,cc-Ⅱ,cc-Ⅲ,and cc-Ⅲb)are investigated by dynamic diamond anvil cell(dDAC)and in situ Raman *** are carried out at room temperature and high pressures up to 12.8 GPa with the pressurizing rate varying from 0.006 GPa/s to 0.056 GPa/*** situ observation shows that with the increase of pressure,calcite transforms from cc-Ⅰto cc-Ⅱat~1.5 GPa and from cc-Ⅱto cc-Ⅲat~2.5 GPa,and transitions are independent of the pressurizing ***,as the pressure continues to increase,the cc-Ⅲb begins to appear and coexists with cc-Ⅲwithin a pressure range that is inversely proportional to the pressurizing *** the pressurizing rates of 0.006,0.012,0.021,and 0.056 GPa/s,the coexistence pressure ranges of cc-Ⅲand cc-Ⅲb are 2.8 GPa-9.8 GPa,3.1 GPa-6.9 GPa,2.7 GPa-6.0 GPa,and 2.8 GPa-4.5 GPa,*** dependence of the coexistence on the pressurizing rate may result from the influence of pressurizing rate on the activation process of transition by reducing the energy *** higher the pressurizing rate,the lower the energy barrier is,and the easier it is to pull the system out of the coexistence *** results of this in situ study provide new insights into the understanding of the phase transition of calcite.

关键词： calcite-Ⅲ dimorphism dynamic diamond anvil cell in situ Raman spectroscopy pressurizing rate

在线全文

学校读者我要写书评

暂无评论

溃疡性结肠炎的心理评估及护理干预

天津护理 2006年第2期14卷 92-93页

作者：盛美华杭州市红十字会医院浙江杭州310003

目的:调查溃疡性结肠炎患者的心理状况,制定相应的护理干预措施。方法:32例溃疡性结肠炎患者分别于入院3天内、治疗4周后填写症状自评量表(SCL-90)。结果:溃疡性结肠炎患者入院时与中国常模相比,各项指标均有异常,经护理干预后,患者各... 详细信息

目的:调查溃疡性结肠炎患者的心理状况,制定相应的护理干预措施。方法:32例溃疡性结肠炎患者分别于入院3天内、治疗4周后填写症状自评量表(SCL-90)。结果:溃疡性结肠炎患者入院时与中国常模相比,各项指标均有异常,经护理干预后,患者各项指标有不同程度好转。结论:溃疡性结肠炎患者心理健康普遍较差,在药物治疗同时需要加强心理护理。

关键词：心理评估溃疡性结肠炎护理干预

在线全文

学校读者我要写书评

暂无评论

论化工企业建筑的的防爆设计

贵州化工 2008年第4期33卷 53-55页

作者：盛美华贵州省化工医药规划设计院贵州贵阳550002

对于防爆设计问题要特别重视,认真,具体设计中,除了必须遵照现行颁布的国家规范,法规及有关规定外,同时也要注意新型的建筑材料在建筑设计中的运用,使之不断发展,不断地研究和创新,臻于完善,使我们的设计工作创造出更多的化工建筑设计... 详细信息

对于防爆设计问题要特别重视,认真,具体设计中,除了必须遵照现行颁布的国家规范,法规及有关规定外,同时也要注意新型的建筑材料在建筑设计中的运用,使之不断发展,不断地研究和创新,臻于完善,使我们的设计工作创造出更多的化工建筑设计作品。

关键词：化工建筑防爆

Microstructure evolution and mechanical properties of ZK60 magnesium alloy produced by SSTT and RAP route in semi-solid state

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2013年第12期23卷 3621-3628页

作者：王长朋张营营李迪凡梅华生张帷刘杰中国兵器工业第五九研究所重庆400039 重庆长安汽车股份有限公司重庆401120

The microstructure evolution and mechanical properties of a ZK60 magnesium alloy produced by the semi-solid thermal transformation （SSTT） route and the recrystallization and partial melting （RAP） route were studied, respectively. The microstructure evolution during partial remelting was studied at different temperatures for different time. The tensile mechanical properties of thixoformed components by the two routes at room temperature were examined. The results show that coalescence is dominant in the SSTT alloy and Ostwald ripening is dominant in the RAP alloy. Compared with the SSTT route, the RAP route can produce finer semi-solid microstructure under the similar isothermal holding condition. The microstructure of the RAP alloy is much more spheroidized compared with the SSTT alloy. Thixoforming for the ZK60 magnesium alloy produced by the SSTT and RAP route results in successful filling of the die, and the thixoforming process improves the mechanical properties of ZK60 magnesium alloy. The RAP alloy shows significantly advantageous mechanical properties over that of the SSTT alloy.

关键词： ZK60 magnesium alloy semi-solid thermal transformation (SSTT) recrystallization and partial melting (RAP) route microstructure evolution mechanical properties

The crosstalk between nitrosative stress and cellular autophagy-lysosome process in endothelial cells during brain ischemia

在线全文

学校读者我要写书评

暂无评论

The crosstalk between nitrosative stress and cellular autoph...

Microglia overactivation facilitate neuronal cell death during cerebral microemboli via P2X7 purinoceptor pathway

中国药理学会第十一次全国学术会议

作者： TAO Rong-rong,huaNG Ji-yun,ZHANG Geng-sheng,LIAO mei-hua,HAN Feng (Institute of Pharmacology,Toxicology and Biochemical Pharmaceutics,Zhejiang University,Hangzhou,China)

OBJECTIVE The present study was desighed to determine the causative links and precise correlations among nitro-sative stress,the cellular autophagy-lysosome process,and neurovascular damage during cerebral *** To mimic ischemic-like conditions in vitro,endothelial cell cultures were exposed to permanent glucose deprivation and hypoxia for 2,6,12 and 24 *** male rats were subjected to general anesthesia,after which 1000 non-radioactive microspheres were injected into the left carotid *** ipsilateral hemisphere was dissected out for morphological and biochemical *** In parallelled with OGD-induced peroxynitrite formation,a rapid induction of microtubule-associated protein 1 light chain 3(LC3) -Ⅰ/Ⅱconversion and green fluorescent protein-LC3 punctae accumulation were observed in endothelial *** Western blot analyses indicated that OGD induced elevations in Lamp2 and cathepsin B protein ***,cultured endothelial cells treated with peroxynitrite(1-50μmol·L) exhibited a concentration-dependent change in the pattern of autophagy-lysosome ***,OGD-induced autophagy -lysosome processes were attenuated by PEP-19 overexpression and by a small-interfering RNA(siRNA)-mediated knockdown of *** current study also focused on the morphological and biochemical aspects of autophagy-lysosome process at miceovessels during the pathological process of cerebral microemboli in *** importance of nitrosative stress in ischemia-induced autophagy-lysosome cascades is further supported by our finding that pharmacological inhibition of nitrosative stress by melatonin partially inhibits the ischemia-induced autophagy-lysosome cascade and the degradation of the tight junction *** Based on our observations, we predict that peroxynitrite-mediated nitrosative stress at least partially potentiates autophagy-lysosome signaling during sustained ischemic insult-induced endothelial cell damage.

关键词： nitrosative stress brain ischemia endothelial cells autophagy tight junction

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

Microglia overactivation facilitate neuronal cell death duri...

啤酒糟生物炭的性质及其对水中Pb2+的吸附特性研究

中国药理学会第十一次全国学术会议

作者： TAO Rong-rong,huaNG Ji-yun,ZHANG Geng-sheng,LIAO mei-hua,HAN Feng (Institute of Pharmacology,Toxicology and Biochemical Pharmaceutics,Zhejiang University, Hangzhou 310000,China)

OBJECTIVE The present study was desighed to determine the causative links and precise correlations among microglial activation,the ATP-gated P2X purinergic receptor cation channel,and neuronal degeneration during cerebral ischemic cell *** The male rats were subjected to general anesthesia,after which 1000 non-radioactive microspheres were injected into the left carotid *** ipsilateral hemisphere was dissected out for morphological and biochemical *** The activation of microglia significantly increased in the ischemic brain at acute phase of microsphere embolism.A secondary activation of microglia was observed after 72 h and remained elevated through 168 h after microsphere *** current study also focused on the temporal,morphological and biochemical aspects of FasL and its expression during the pathological process of cerebral microemboli in vivo.A significant number of FasL-expressing cells,which were diffusely labeled with a round morphology,were found restricted to the microembolic region 168 h after ***,enhanced P2X immunoreactivity coincided with increased anti-FasL immunore-activity in same ischemic *** characterized a mechanism whereby activated microglia mediate neuronal cell death via P2X purinergic receptors and FasL/Fas signaling in response to *** animals treated with minocycline(45 mg·kg),less FasL expression and Fluoro-Jade C-positive structures were observed in the ipsilateral brain hemisphere of ischemic *** Based on our observations,we predict that the early activation of P2X purinoceptors in microglia results in gradual accumulation of FasL and the subsequent activation of downstream cell death *** together,these results suggest the potential of a novel therapeutic neuroprotective approach using pharmacological blockade of sustained microglial activation against neurovascular disorders.

关键词： microsphere embolism ischemia microglia Fas ligand P2X7 receptor neuronal cell death

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

安全与环境学报 2019年第5期19卷 1711-1718页

作者：徐小逊吴娇盛美华陶敏王丹曹阳四川农业大学环境学院成都611130 四川省土壤环境保护重点实验室成都611130

为寻求酿造废弃物啤酒糟新型的资源化利用途径,利用热解技术在300~700℃下制备啤酒糟生物炭(BC),用于吸附废水中Pb2+。在对其基本理化性质表征的基础上,研究了初始pH值、吸附温度、吸附时间和BC投加量等因素对吸附性能的影响,并分析了... 详细信息

为寻求酿造废弃物啤酒糟新型的资源化利用途径,利用热解技术在300~700℃下制备啤酒糟生物炭(BC),用于吸附废水中Pb2+。在对其基本理化性质表征的基础上,研究了初始pH值、吸附温度、吸附时间和BC投加量等因素对吸附性能的影响,并分析了可能的吸附机理。结果表明,随热解温度升高,BC平均孔径不断增大,孔体积和比表面积也相应增加,且芳香化程度和稳定性增强,有利于其吸附重金属。吸附试验显示,BC对Pb2+的吸附速率较快,酸性条件更有利于Pb2+的吸附,且更适合在常温条件下进行吸附。BC700在吸附2. 5 h时达到吸附平衡,其最大吸附量可达168. 2 mg/g。BC对Pb2+的吸附符合Langmuir模型和准二级动力学方程,表明其对Pb2+的去除机理主要为单分子层的化学吸附。因此,BC可作为去除含Pb2+废水的生物吸附材料。

关键词：环境工程学啤酒糟生物炭 Pb^2+ 吸附机理

Performance evaluation of ultra-long lithium heat pipe using an improved lumped parameter model

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第12期32卷 89-102页

作者： Chong-Ju Hu Da-Li Yu mei-sheng He hua-Ping mei Jie Yu Tao-sheng Li Institute of Nuclear Energy Safety Technology Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Suzhou University Suzhou 234000China

Lithium heat pipes have broad applications in heat pipe cooling reactors and hypersonic vehicles owing to their ultra-high working *** particular,when the length of the lithium heat pipe is ultra-long,the flow and heat transfer characteristics are more *** this study,an improved lumped parameter model that considers the Marangoni effect,bending effect,and different vapor flow patterns and Mach numbers was ***after,the proposed model was verified using the University of New Mexico’s Heat Pipe and HTPIPE ***,the verified model was applied to simulate the steady-state operation of an ultra-long lithium heat pipe in a Heat PipeSegmented Thermoelectric Module Converters space *** on the results:(1)Vapor thermal resistance was dominant at low heating power and decreased with increasing heating *** vapor flow inside the heat pipe developed from the laminar to the turbulent phase,whereas the liquid phase in the heat pipe was always laminar.(2)The vapor pressure drop caused by bending was approximately 22–23%of the total,and the bending effect on the liquid pressure drop could be ignored.(3)The Marangoni effect reduced the capillary limit by hindering the liquid reflux,especially at low vapor *** considering the Marangoni effect,the capillary limit of the lithium heat pipe was overestimated by 9%when the vapor temperature was 1400 K.(4)The total thermal resistance of the heat pipe significantly increased with increasing adiabatic length when the vapor temperature was ***,the wick dryness increased with increasing adiabatic length at any vapor *** findings improve on current knowledge for the optimal design and safety analysis of a heat pipe reactor,which adopts ultra-long lithium heat pipes.

关键词： Lithium heat pipe Bending effect Marangoni effect Capillary limit Heat Pipe-Segmented Thermoelectric Module Converters(HP-STMC)

Oxidation of Mercaptans from Light Oil Sweetening by Fe_2O_3/MgO/Al_2O_3 Supported CoPcS Catalyst

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2010年第3期12卷 12-17页

作者： mei hua Liu Hui sheng Kuang College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing 210009 Research Center of Surface and Interface Chemical and Engineering Technology Nanjing University

MgO/Al2O3 and Fe2O3/MgO/Al2O3 solid bases were prepared through mixing method. After sulfonated cobalt phthalocyanine （CoPcS） being supported on these solid bases, the catalytic performance of these catalysts was evaluated by means of mercaptan oxidation reaction. The samples were characterized by X-ray diffraction （XRD）, CO2 temperature-programmed desorption （CO2-TPD）, FTIR spectroscopy, and X-ray photoelectron spectroscopy （XPS）. Investigation was focused on the effect of Fe2O3 on activity, crystal structure, basicity, and stability of the catalyst and also on the role of Fe2O3 in the mercaptan oxidation processes. Test results have shown that the Fe2O3/MgO/Al2O3- CoPcS catalyst has a higher initial activity and a much longer service life than the MgO/Al2O3-CoPcS catalyst. The increased types of basic sites coupled with an enhanced oxidation ability resulted from the addition of Fe2O3 have contributed to the improvement of the catalytic activity of the MgO/Al2O3-CoPcS catalyst.

关键词： mercaptan oxidation solid base Fe2O3/MgO/Al2O3