检索结果-南通市图书馆

Solvation Effects on the Dielect.ic Constant of 1 M LiPF6 in Ethylene Carbonate:Ethyl Methyl Carbonate 3:7

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第1期7卷 253-256页

作者： Julian Self Nathan t.Hahn Kristin A.Persson Department of Chemical Engineering Polytechnique MontrealMontrealQC H3T 1J4Canada Department of Materials Science and Engineering University of CaliforniaBerkeleyCA 94720USA Energy technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Material Physical and Chemical Sciences CenterSandia National LaboratoriesAlbuquerqueNM 87185USA

We report the dielect.ic constant of 1 M LiPF_(6)in EC:EMC 3∶7 w/w(ethylene carbonate/ethyl methyl carbonate)in addition to neat EC:EMC 3∶7 w/*** three Debye relaxations,the static permit.ivity value,or dielect.ic constant.is extrapolated to 18.5,which is compared to 18.7 for the neat solvent *** EC solvent.is found to strongly coordinate with the Li^(+)cations of the salt,which results in a loss of dielect.ic cont.ibution to the ***,the small amplitude and large uncert.inty in relaxation frequency for EMC cloud definitive identification of the Li^(+)solvation ***,the loss of the free EC permit.ivity cont.ibution due to Li^(+)solvation is almost completely balanced by the positive cont.ibution of the associated LiPF_(6)salt,demonstrating that a significant quantity of dipolar ion pairs exists in 1 M LiPF_(6)in EC:EMC 3∶7.

关键词： batteries dielect.ic relaxation spectroscopy electrolytes

在线全文

学校读者我要写书评

暂无评论

美国页岩油气地质特征及勘探开发进展

石油勘探与开发 2024年第4期51卷 807-828页

作者： MCMAHON t P LARSON t E ZHANG t SHuStER M 美国德克萨斯大学奥斯汀分校杰克逊地质科学学院经济地质局奥斯汀78758-4445德克萨斯州美国

基于美国页岩油气勘探开发历程的回顾,对主要页岩盆地的地质演化、主要页岩层系的油气地质特征及勘探开发进展进行系统梳理和总结。美国重要页岩盆地的富烃页岩主要发育于6个地质时期:中奥陶世、中—晚泥盆世、早石炭世(中—晚密西西比... 详细信息

基于美国页岩油气勘探开发历程的回顾,对主要页岩盆地的地质演化、主要页岩层系的油气地质特征及勘探开发进展进行系统梳理和总结。美国重要页岩盆地的富烃页岩主要发育于6个地质时期:中奥陶世、中—晚泥盆世、早石炭世(中—晚密西西比世)、早二叠世、晚侏罗世和晚白垩世(塞诺曼期—土伦期),构造沉积环境主要包括克拉通内盆地、前陆盆地和被动大陆边缘盆地。古生界富烃页岩主要分布于以下6个盆地:阿巴拉契亚盆地(尤蒂卡页岩和马塞勒斯页岩)、阿纳达科盆地(伍德福德页岩)、威利斯顿盆地(巴肯页岩)、阿卡马盆地(费耶特维尔页岩)、沃思堡盆地(巴内特页岩)和二叠盆地(狼营组和斯帕瑞组/骨泉组页岩)。中生界富烃页岩主要发育在西墨西哥湾盆地(海恩斯维尔组和鹰滩组)和落基山盆地群(以丹佛和粉河盆地的尼尔布拉勒组页岩为主)。通过对各页岩区带的详细分析发现,页岩的岩相和矿物成分存在差异,“页岩储层”并非只是页岩,很多情况下页岩油气还产自粉砂岩和碳酸盐岩等多种岩石类型。美国的页岩油气资源丰富,页岩油地质资源量超过0.246×1012 t,页岩气地质资源量超过290×1012 m3。在开启“页岩革命”的水平井水力压裂技术出现之前,美国经过了长达20年的勘探开发实践和理论技术积累。自2007年至2023年,美国页岩油气产量从约11.2×104t/d油当量增加到超过300.0×104t/d油当量,2017年页岩油气产量超过了常规油气,2023年在油气总产量中的占比增加到60%以上。页岩油气的开发主要得益于钻完井技术的改进,“立体开发”的攻关,以及重复压裂、提高原油采收率和“u”形井等技术的应用。基于美国丰富的页岩资源基础和技术的不断进步,页岩油气的产量将继续为全美的油气生产做出更大贡献。

关键词：美国页岩油页岩气页岩储层非常规储层油气产量资源评价

Detection of a reassortant swine H1N2 influenza A virus from pigs in Hong Kong

同方期刊数据库

同方期刊数据库更多评论

在线全文

学校读者我要写书评

暂无评论

Virologica Sinica 2024年第2期39卷 343-346页

作者： Guoqian Gu Congnuan Liu Song Hao Lee Lewis Sze Chun Choi Michael t.Wilson Dirk u.Pfeiffer Yun Young Go Department of infectious Diseases and Public Health Jockey Club College of Veterinary Medicine and Life SciencesCity University of Hong KongHong Kong SARChina Center for Applied One Health Research and Policy Advice Jockey Club College of Veterinary Medicine and Life SciencesCity University of Hong KongHong Kong SARChina College of Veterinary Medicine Konkuk UniversitySeoul143-701Republic of Korea

Dear Editor,influenza A viruses(iAVs)are responsible for significant respiratory illnesses in humans and a broad range of animal *** outbreaks and the rapid spread of genetically and antigenically distinct.iAVs represent a considerable challenge for swine *** are susceptible to avian and human iAV infections and are considered“mixing vessels”where human,avian,and swine iAVs can recombine and generate novel reassortant.influenza viruses with pandemic potential(Vincent et al.,2014).

关键词： swine influenza mixing

Supposition of graphene stacks to estimate the contact resistance and conductivity of nanocomposites

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

Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 663-676页

作者： Y.ZARE M.t.MuNiR G.J.WENG K.Y.RHEE Biomaterials and tissue Engineering Research Group Department of Interdisciplinary TechnologiesBreast Cancer Research CenterMotamed Cancer InstituteTehran ***Iran College of Engineering and technology American University of the Middle EastEgaila 54200Kuwait Department of Mechanical and Aerospace Engineering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Department of Mechanical Engineering(BK21 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

in t.is study,the effects of stacked nanosheets and the surrounding interphase zone on the resistance of the contact region between nanosheets and the tunneling conductivity of samples are evaluated with developed equations superior to those previously *** contact resistance and nanocomposite conductivity are modeled by several influencing factors,including stack properties,interphase depth,tunneling size,and contact *** developed model's accuracy is verified through numerous experimental *** further validate the models and establish correlations between parameters,the effects of all the variables on contact resistance and nanocomposite conductivity are ***,the contact resistance is primarily dependent on the polymer tunnel resistivity,contact area,and tunneling *** dimensions of the graphene nanosheets significantly influence the conductivity,which ranges from 0 S/m to90 S/*** increased number of nanosheets in stacks and a larger gap between them enhance the nanocomposite's ***,the t.icker interphase and smaller tunneling size can lead to higher sample conductivity due to their optimistic effects on the percolation threshold and network efficacy.

关键词： graphene polymer composite stacked nanosheet tunneling conductivity contact resistance interphase

Féeton(B-L gauge boson)dark matter for the 511-keV gamma-ray excess and the prediction of low-energy neut.ino flux

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第8期48卷 76-82页

作者： Jie Sheng Yu Cheng Weikang Lin t.utomu t.Yanagida t.ung-Dao Lee institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityChina Key Laboratory for Particle Astrophysics and Cosmology(MOE)&Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong UniversityShanghai 200240China South-Western institute For Astronomy Research Yunnan UniversityKunming 650500China Kavli iPMu(WPi) UTIASUniversity of TokyoKashiwa277-8583Japan

the féeton is the gauge boson of the u(1)_(B−L) gauge *** the gauge coupling constant.is extremely small,the féeton becomes a candidate for dark *** show that.its decay to a pair of an electron and a positron explains the observed Galactic 511-keV gamma-ray excess in a consistent *** féeton dark matter decays mainly into pairs neut.ino and *** low-energy experiments with improved directional capability will enable capturing these neut.ino *** seesaw-motivated parameter space predicts a relatively short féeton lifetime that.is comparable to the current cosmological constraint.

关键词： feeton 511-keV gamma-ray excess low-energy neut.ino

theoretical and experimental investigations on an X-shaped vibration isolator with active controlled variable stiffness

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8期45卷 1371-1386页

作者： Zeyu CHAi J.t.HAN Xuyuan SONG Jian ZANG Yewei ZHANG Zhen ZHANG College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China Jacobs School of Engineering University of California San DiegoSan Diego CA 92122U.S.A. Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of EducationNortheastern UniversityShenyang 110819China

A novel X-shaped variable stiffness vibration isolator(X-VSVi)is *** Runge-Kutta method,harmonic balance method,and wavelet transform spectra are introduced to evaluate the performance of the X-VSVi under various *** layer number,the installation angle of the X-shaped st.ucture,the stiffness,and the active control parameters are systematically *** addition,a prototype of the X-VSVi is manufactured,and vibration tests are carried *** results show that the proposed X-VSVi has a superior adaptability to that of a traditional X-shaped mechanism,and shows excellent vibration isolation performance in response to different amplitudes and forms of ***,the vibration isolation efficiency of the device can be improved by appropriate adjustment of parameters.

关键词： bionic vibration isolation X-shaped st.ucture variable stiffness st.ucture nonlinear dynamics prototype experiment

thermoluminescence characterization of natural and synthetic irradiated Ce-monazites

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第4期42卷 643-650页

作者： V.Correcher C.Boronat J.Garcia-Guinea J.F.Benavente t.Rivera-Montalvo CiEMAt Av.Complutense 4028040MadridSpain MNCN-CSiC J.Gutierrez Abascal 228006MadridSpain instituto Politécnico Nacional CICATA-IPNAv.Legaria 694Mexico City11500Mexico

the thermoluminescence(tL)emission of synthetic and natural Ce-monazites was characterized here to determine the potential application in the identification of microscopic defects from a qualitative point of view trying to link each tL peak to a chemical-physical *** kinetic parameters that lead the luminescence processes were calculated by means of variable heating rate and computing glow curve deconvolution methods and allow identifying three groups of components at~90,130 and 290℃(for the mineral sample)and~90,170,220,270 and 320℃(for the synthetic CePO_(4):Nd_(0.20),La_(0.25)).the main differences appreciated in these complex tL curves are mainly due to(i)the content of impurities(natural sample cont.ins lanthanides as well as u 0.60%and th 5.22%)and(ii)the degree of crystallinity of the samples which is directly related to the type of impurities(synthetic monazite relies only on Nd and La).the behavior of the dose response in the range of 1-8 Gy is similar for both samples;the tL intensity increases linearly as the dose increases without changes in the position of the maxima,denoting first-order kinetic luminescence *** peak could be mostly associated with st.uctural defects(i.e.,phase transitions),chemical reactions(i.e.,Ce3+?Ce4+redox reaction,dehydration or dehydroxylation processes)or int.insic defects(i.e.,Frenkel defects,ODCs or NBOHCs).

关键词： thermoluminescence Kineticparameters Phosphate Ce-monazite Defects Rare earths

inflow and outflow permeability tests in a very soft clay under low stresses

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3270-3283页

作者： J.W.S.Vargas F.A.B.Danziger F.R.Lopes t.Lunne Federal university of Rio de Janeiro Rio de JaneiroBrazil Norwegian Geotechnical institute OsloNorway

in situ inflow and outflow permeability tests with the BAt probe at Sarapuíii soft clay test site are presented.A description of the BAt permeability test.is provided,discussing its advantages and shortcomings,especially in the case of very soft clays under low *** pressures were monitored during probe installation and were found to be slightly lower than piezocone u2 pore pressures,consistent with the position of the *** role of filter tip saturation was investigated after the usual saturation procedure provided an unsatisfactory pore pressure response during probe *** show that the vacuum saturation procedure provides adequate response during installation and increases the reliability of the coefficient of permeability determination in early *** inflow and outflow tests yielded similar results,indicating that careful execution of the test can lead to good test repeatability regardless of the loading *** sequences of alternated inflow and outflow tests have yielded similar results,indicating that soil reconsolidation and filter clogging were negligible in the tests *** are presented concerning the relationship between index parameters and the in situ coefficient of permeability for Sarapuíii clay,which plot out.ide the range of existing databases.

关键词： Permeability test Soft clay BAt probe inflow and outflow tests

Paper Analytical Device for the Colourimet.ic Detection of Alkaline Phosphatase in Serum and Saliva

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

Journal of Analysis and testing 2024年第03期8卷 385-394页

作者： D.Alageswari A.LakshmiDevi P.E.Resmi P.V.Suneesh Aarat.iPradeep t.G.SatheeshBabu Department of Chemistry Amrita School of Physical Sciences Coimbatore Amrita Vishwa Vidyapeetham Amrita Biosensor Research Lab Amrita School of Engineering Coimbatore Amrita Vishwa Vidyapeetham Amrita Biomedical Engineering Centre Amrita School of Engineering Coimbatore Amrita Vishwa Vidyapeetham

A paper analytical device (PAD) was developed for the colourimet.ic estimation of alkaline phosphatase (ALP). ALP catalyzes the hydrolysis of disodium phenyl phosphate (DSPP) to phenol, which then undergoes oxidative coupling with4-aminoantipyrine (4-AAP) producing a reddish brown-coloured quinone imine. the colourimet.ic reaction tested in solution has been translated onto a PAD for the point of care (PoC) testing of ALP. A uniform colour was obt.ined in 25 min with the introduction of ALP onto the reagent drop cast paper device. the images obt.ined by scanning the PAD were processed using imageJ software. the colour intensity obt.ined by image processing was proportional to the concentration of ALP present.in the sample. ALP in serum and saliva samples were tested using the PAD in the range of 0 to 528 u/L and0 to 187 u/L, respectively. the interference studies revealed that the PAD was selective to ALP in the presence of other biomolecules. the PAD exhibited a limit of detection (LOD) of 3.3 u/L and a sensitivity of 48.36 a.u/Log(u/L) for serum ALP and LOD of 1.69 u/L and a sensitivity of 28.5 a.u/Log (u/L) for salivary ALP. the PAD showed good agreement with the clinical methods for real samples.

关键词： Alkaline phosphatase Colourimetry imageJ Paper analytical device Point of care testing