检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

空间遥感器复合材料主承力相机底板研制技术

航天制造技术 2017年第3期 4-8页

作者：宁晓周黄云孙东华房海军北京空间机电研究所北京100076

碳纤维复合材料因其质量轻、比强度和比刚度高等优点,越来越多地应用到航天器结构上。碳面板/铝蜂窝夹层结构板因刚度不足而难以在空间光学遥感器上广泛应用。通过优化设计,合理布局,研制出整体成型的碳纤维加强框架,提升普通蜂窝夹层... 详细信息

碳纤维复合材料因其质量轻、比强度和比刚度高等优点,越来越多地应用到航天器结构上。碳面板/铝蜂窝夹层结构板因刚度不足而难以在空间光学遥感器上广泛应用。通过优化设计,合理布局,研制出整体成型的碳纤维加强框架,提升普通蜂窝夹层结构底板的力学性能,研究证明,该相机底板能够大幅提高普通蜂窝夹层板的结构刚度和强度,可以作为空间光学遥感器的主承力底板,对类似结构的研制也具有一定的参考价值。

关键词：遥感相机复合材料底板结构分析加强框架

Spatial Correlation in Typical Binary Polycondensation Systems: An Essential Extension of the Kirkwood-Buff Theory

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2023年第6期39卷 985-991页

作者： GU fang LI Jiangtao HONG Xiaozhong WANG haijun College of Chemistry and Materials Science Hebei UniversityBaoding 071002P.R.China College of Physical Science and Technology Hebei UniversityBaoding 071002P.R.China Chemical Biology Key Laboratory of Hebei Province Hebei UniversityBaoding 071002P.R.China Key Laboratory of Medicinal Chemistry and Molecular Diagnosis Ministry of EducationHebei UniversityBaoding 071002P.R.China

We present the isothermal susceptibility(XT)for the typical binary polycondensation system of Af-Bg type,and relate XT to the weight-average degree of polymerization in terms of the Kirkwood-Buff(KB)*** investigation is based on a new expression of XT for mixtures,which is still expressed by the KB integrals(KBIs)but endowed with an explicit physical *** polymerization systems,it is proposed that the KBIs can be further decomposed according to whether there exists a bond between particles when conversions(extents of reaction)of functional groups are incorporated into the *** this way,XT is directly decomposed into its relevant components as *** is especially useful to reveal the relationship between local structures and average properties of various polymerization *** a consequence,the effect of polymerization on XT is greatly simplified in comparison with the free energy ***,we have provided a very simple method to carry out some thermodynamic properties of polymerization systems.

关键词： Isothermal compressibility Polycondensation Kirkwood-Buff theory Radial distribution function Spatial correlation

Structure of Solution of Colloid and Hydrogen Bonding Fluid Near a Semipermeable Membrane

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

Chemical Research in Chinese Universities 2017年第2期33卷 248-254页

作者： ZHAO Meng CHEN Hanfei GU fang WANG haijun College of Chemistry and Environmental Science Hebei University Baoding 071002 P. R. China Chemical Biology Key Laboratory of Hebei Province Hebei University Baoding 071002 P. R. China Key Laboratory of Medicinal Chemistry and Molecular Diagnosis Ministry of Education Hebei University Baoding 071002 P. R. China

The local fluid structure of a solution consisting of colloid particles and hydrogen bonding（HB） fluid se-parated from pure solvent by a semipermeable membrane was investigated, where the colloid particles and HB fluidserve as solute and solvent, respectively. In this paper, the semipermeable membrane allows the passage of solventmolecules but not solute particles, and therefore, it provides a nano-confinement for colloid particles. The densityprofiles of the two species near the semipermeable membrane were determined via density functional theory（DFT）for classical fluids. Based on the predicted density profiles under various conditions, the effects of HB strength, func-tionality, total bulk density, density fraction and the size ratio of two species on the fluid structure were discussed. Asan application, the osmotic pressures of the system were also presented. It is shown that the local structure andosmotic pressure can be efficiently regulated by these factors due to the competition between the excluded volumeinteractions and the FIB interaction. The present results are expected to be helpful to study the osmotic phenomenaand relevant problems on the nanoscale.

关键词： Hydrogen bonding fluid Semipermeable membrane Osmotic pressure Density functional theory

Statistical theory for hydrogen bonding fluid system of A_aD_d type(II):Properties of hydrogen bonding networks

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

Science China Chemistry 2007年第1期50卷 11-17页

作者： WANG haijun HONG XiaoZhong GU fang BA XinWu College of Chemistry and Environment Science Hebei UniversityBaoding 071002China International Center for Materials Physics Chinese Academy of SciencesShenyang 110016China College of Physics Science and Technology Hebei UniversityBaoding 071002China

Making use of the invariant property of the equilibrium size distribution of the hydrogen bonding clus- ters formed in hydrogen bonding system of AaDd type,the analytical expressions of the free energy in pregel and postgel regimes are *** the gel free energy and the scaling behavior of the number of hydrogen bonds in gel phase near the critical point are investigated to give the corre- sponding scaling exponents and scaling ***,some properties of intermolecular and in- tramolecular hydrogen bonds in the system,sol and gel phases are *** a result,the explicit relationship between the number of intramolecular hydrogen bonds and hydrogen bonding degree is obtained.

关键词： hydrogen bonding network gel phase scaling law

Enhancement of corrosion resistance of AZ31 Mg alloys by one-step in situ synthesis of ZnAl-LDH films intercalated with organic anions(ASP, La)

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第2期9卷 658-667页

作者： Yuhan Song Yan Tang Liang fang fang Wu XianGuang Zeng Jia Hu Shu fang Zhang Bin Jiang haijun Luo State Key Laboratory of Power Transmission Equipment&System Safety and New Technology Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart MaterialsCollege of PhysicsChongqing UniversityChongqing 400044PR China School of Chemical&Environmental Engineering China University of Mining&TechnologyBeijing 100083PR China Material Corrosion and Protection Key Laboratory of Sichuan Province Institute of Materials Science and EngineeringSichuan University of Science and EngineeringZigongSichuan Province 643000PR China National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044PR China College of Software Chongqing College of Electronic EngineeringChongqing 401331PR China Key Laboratory on Optoelectronic Functional Materials College of Physics and Electronic EngineeringChongqing Normal UniversityChongqing 401331PR China

Inserting corrosion inhibitors into a lamellar protective coating is an effective way to improve the corrosion resistance of metal *** this work,two kinds of environmentally friendly organic acid anions,aspartic acid(ASP)and lauric acid(La),were explored as corrosion inhibitors to in situ intercalate into the Zn Al-layered double hydroxides(Zn Al-LDHs)on AZ31 magnesium alloys by a facile one-step hydrothermal *** morphology,composition,structure and the corrosion resistance of these two LDHs coating before and after corrosion experiment were *** is found that both the two kinds of Zn Al-LDHs films consist of uniform and dense layered nanosheets(NSs),and the NSs of ZnAl-ASP-LDHs films grow vertically,but those of ZnAl-La-LDHs films exhibit a staggered tilted *** corrosion current density of the two Zn Al-LDHs films are two orders of magnitude lower than that of Mg alloy *** one week’s immersion in NaCl solution,the NSs structure of two kind of ZnAl-LDHs films still remains the uniform and densely coverage on Mg *** to the larger d(003)spacing,the ZnAl-La-LDHs have better ability to absorb Cl-and release interlayer anions than Zn *** results indicate that the Zn Al-LDHs films intercalated with organic anions,specially La anions,can significantly improve the corrosion resistance of Mg alloy.

关键词： ZnAl-LDHs Magnesium alloy Organic anions Corrosion resistance Aspartic acid Lauric acid

On Klein tunneling of low-frequency elastic waves in hexagonal topological plates

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1139-1154页

作者： Yuxin YAO Yuansheng MA fang HONG Kai ZHANG Tingting WANG haijun PENG Zichen DENG School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China MIIT Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian116024Liaoning ProvinceChina

Incident particles in the Klein tunnel phenomenon in quantum mechanics can pass a very high potential *** the concept of tunneling into the analysis of phononic crystals can broaden the application *** this study,the structure of the unit cell is designed,and the low frequency(<1 k Hz)valley locked waveguide is realized through the creation of a phononic crystal plate with a topological phase transition *** defect immunity of the topological waveguide is verified,that is,the wave can propagate along the original path in the cases of impurities and ***,the tunneling phenomenon is introduced into the topological valley-locked waveguide to analyze the wave propagation,and its potential applications(such as signal separators and logic gates)are further explored by designing phononic crystal *** research has broad application prospects in information processing and vibration control,and potential applications in other directions are also worth exploring.

关键词： topological metamaterial elastic wave Klein tunneling valley-locked waveguide

在线全文

学校读者我要写书评

暂无评论

内置光阑式遮光罩成型技术探讨

航天制造技术 2012年第4期 27-30,34页

作者：章令晖王超房海军涂彬王翰辰李明珠北京空间机电研究所北京100076

介绍了一种常见的空间遥感器遮光罩——内置光阑式遮光罩的结构形式和工艺特点,并重点对内置光阑式遮光罩的材料选择、成型方案、工艺方法等内容进行了讨论。

关键词：遥感器内置光阑式遮光罩复合材料成型技术

Geochemical Characteristics and Gas-to-Gas Correlation of Two Leakage-type Gas Hydrate Accumulations in the Western Qiongdongnan Basin, South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2022年第2期96卷 680-690页

作者： LAI Hongfei QIU haijun LIANG Jinqiang KUANG Zenggui fang Yunxin REN Jinfeng LU Jing’an Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China MNR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China

In recent years,a series of highly saturated leakage-type gas hydrates have been discovered in the western Qiongdongnan Basin(QDNB),South China *** on the molecular compositional and isotopic characteristics of the gas samples relevant to the gas hydrates collected from the two leakage-type gas hydrate accumulations in the GMGS5 and GMGS6 drilling zones,a detailed geochemical gas-to-gas correlation was conducted in this study,in order to further understand the geochemical characteristics and possible hydrocarbon sources of these gas *** natural gas relevant to the gas hydrates in the GMGS5 block is characterized by wet gas(67.96%0.9)and lack molecular and carbon isotope *** 40%‒60%of the methane within the gas hydrate is of microbial origin,while the C^(2+)gas components are typical coal-type gas that are derived from thermogenic source rocks or deeply-buried natural gas *** addition,typical in situ primary microbial methane(−80.6‰<δ^(13)C-C_(1)<−67.7‰)was discovered in well W b,which was applied to estimate the contribution of the microbial gas to the gas *** gas-to-gas correlation results show that the hydrate gases within the two leakage-type gas hydrate accumulations in the GMGS5 and GMGS6 blocks are geochemically different,suggesting that they may have been derived from different source *** results further indicate that the deeply-buried thermogenic gas significantly contributed to the shallowly-buried gas hydrates in the western QDNB and multiple effective thermogenic source kitchens provided the hydrocarbon gas in the gas hydrate accumulations.

关键词： gas hydrate gas genetic type hydrocarbon gas source geochemical characteristics

Effect on serum metabolomics of rats with premature ovarian insufficiency by Zhibian(BL54) through Shuidao(ST28) acupuncture

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2024年第4期44卷 722-733页

作者： YAN Jing FENG Huimin QIU fang WANG haijun YIN Luyun JIN Xiaofei ZHAO Jiyu WANG Hongyang YAN Xiaoqin Second Clinical College of Shanxi University of Traditional Chinese Medicine Jinzhong 030619China Research Center of Experimental Acupuncture Science Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Cervical and Lumbar Vertebral Diseases Jinzhong Hospital Affiliated to Shanxi University of Traditional Chinese MedicineJinzhong 030600China

OBJECTIVE:To analyze the serum metabolic targets of the"Zhibian(BL54)through Shuidao(ST28)"acupuncture technique in cyclophosphamide(CTX)-induced premature ovarian insufficiency(POI)model rats and to elucidate the potential molecular mechanism of acupuncture in improving ***:We used an intraperitoneal injection of CTX to establish the POI rat model(POI group)and compared serum hormone levels and ovarian histopathological changes to evaluate the effect of the Zhibian(BL54)through Shuidao(ST28)technique(ZS+POI group)on ovarian ***,nontargeted metabolomics was performed using rat serum by ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry(UPLC-Q-TOF/MS).RESULTS:After acupuncture intervention,the serum hormone levels and ovarian pathological morphology of POI rats were effectively ***,UPLC-Q-TOF/MS results showed that the ZS+POI group showed a significant reversal of the levels of 6 differential *** them,the levels of four serum metabolic markers,divanillyltetrahydrofuran ferulate,trans-ferulic acid,tryptamine,and neuraminic acid,increased *** analysis of biological effects showed that all metabolites were involved in the regulation of reproductive hormone levels and antioxidant and antiapoptotic ***:The"Zhibian(BL54)through Shuidao(ST28)"acupuncture method may improve the ovarian function of POI rats by regulating serum metabolite markers to exert antioxidant and antiapoptotic effects,which provides a theoretical basis for the clinical application of acupuncture in the treatment of POI.

关键词： acupuncture premature ovarian insufficiency metabolomics ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry Zhibian(BL54)through Shuidao(ST28)