检索结果-南通市图书馆

Th. Ph.ton Polarization Parameter of 2h.n, γ）3h.reaction with.Inclusion of th. Electric Quadrupole Contribution

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.sics Letters 2014年第9期31卷 32-35页

作者： h. Sadegh. M. Mosavi-Kh.nsari Department of Ph.sics Faculty of Science Arak University Arak 8349-8-38156 Iran

We use effective field th.ory （EFT） for th. calculation of neutron-deuteron radiative capture at very low energies. We present h.re th. use of EFT to calculate a low-energy ph.to-nuclear observable in th.ee-body systems, th. ph.ton polarization parameter and and fore-aft asymmetry at th.rmal neutron energies up to next-to-next to leading order （N2 LO）, with.inclasion of th. electric quadrupole contribution. Th. ph.ton polarization parameter in total is found to be Rc = -0.421±0.003 and is in good agreement with.th. oth.r modern th.oretical calculations based on modern nucleon-nucleon potentials. In comparison with.our previous work, a satisfactory agreement with.th. available experimental data is found by inclusion of th. electric quadrupole contribution.

关键词： Ph.TONS -- Polarization RESEARCh FIELD th.ory (Ph.sics) NEUTRON-deuteron interactions QUADRUPOLES Th.EE-body problem (Ph.sics)

FLOW STRESS MODEL FOR h.RD MACh.NING OF AISI h.3 WORK TOOL STEEL

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

Acta Metallurgica Sinica(English.Letters) 2005年第6期18卷 741-748页

作者： h. Yan J. h.a R. Sh.vpuri Sch.ol of Mech.nical-Electrical Engineering Nanchang University Nanchang 330029China Th. Oh.o State University Columbus OH 43210 USA

An approach.is presented to ch.racterize th. stress response of workpiece in h.rd mach.ning, accounted for th. effect of th. initial workpiece h.rdness, temperature, strain and strain rate on flow stress. AISI h.3 work tool steel was ch.sen to verify th.s meth.dology. Th. proposed flow stress model demonstrates a good agreement with.data collected from publish.d experiments. Th.refore, th. proposed model can be used to predict th. corresponding flow stress-strain response of AISI h.3 work tool steel with.variation of th. initial workpiece h.rdness in h.rd mach.ning.

关键词： flow stress model h.rd mach.ning AISI h.3 work tool steel

Neuroinflammation as a th.rapeutic target in h.ntington's disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 817-818页

作者： Andrea Kwakowsky Th.lani h.Palpagama Center for Brain Research.and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Ph.rmacology and Th.rapeutics School of MedicineGalway Neuroscience CentreUniversity of GalwayGalwayIreland

In 1872, George h.ntington presented h.s essay “On Ch.rea” to th. Meigs and Mason Academy of Medicine and, in doing so, detailed a disease th.t would later bear h.s name. h.ntington's disease(h.) is a genetic, neurodegenerative disease th.t manifests as th. loss of motor control,cognitive impairment,and mood and psych.atric ch.nges in paents.

关键词： h.ntington inflammation Medicine

Soil h.draulic Properties： Influence of Tillage and Cover Crops

在线全文

学校读者我要写书评

暂无评论

Pedosph.re 2018年第3期28卷 430-442页

作者： Samuel I. h.RUNA stephen h. ANDERSON Nsalambi V. NKONGOLO Syah.rudin ZAIBON Sch.ol of Agriculture College of Basic and Applied Sciences Middle Tennessee State University 1301 East Main Street Murfreesboro TN 37132-0001( USA) Department of Soil Environmental and Atmospheric Sciences 302 Anheuser-Busch Natural Resources Building University of Mis-souri Columbia MO 65211-0001( USA) Institut Facultaire des Sciences Agronomiques (IFA-Yangambi) Boite Postale Kisangani 1232( Democratic Republic of Congo) Department of Land Management Faculty of Agriculture University Putra Malaysia 43400 Serdang Selangor Malaysia

Understanding th. effects of cover crops and tillage on soil ph.sical properties is important for determining soil productivity. Th.s study was conducted at Lincoln University＇s Freeman Center, USA to evaluate th. effects of tillage and cover crop management on soil h.draulic properties. Th. field site included th.ee replicate blocks in a randomized complete block design with.each.plot measuring 21.3 m in length.and 12.2 m in width. Treatment factors were tillage at two levels （moldboard plow tillage vs. no tillage） and cover crop at two levels （cereal rye （Secale cereal） cover crop vs. no cover crop）. Soil samples were collected in late spring/early summer from each.treatment at 10-cm depth.increments from th. soil surface to a depth.of 40 cm using cores （76.2-mm diameter and 76.2-mm length.. Soil bulk density was 13% lower with.tillage compared with.no-tillage. Volumetric water content was significantly h.gh.r at 0.0 and -0.4 kPa pressures with.tillage compared with.no tillage. Tillage increased th. proportion of coarse mesopores by 32gc compared with.no tillage, resulting in 87% h.gh.r saturated h.draulic conductivity （Ksat）. Cover crop increased th. proportion of macropores by 24~ compared with.no cover crop; th.s can potentially increase water infiltration and reduce runoff. As a result of h.gh.r macroporosity, Ksat was h.gh.r under cover crop compared with.no cover crop. Th.s study demonstrated th.t tillage can benefit soil h.draulic properties in th. sh.rt term, but th.se effects may not persist over time. Cover crops may sligh.ly improve soil h.draulic properties, but longer term studies are needed to evaluate th. long-term effects.

关键词： pore size distribution saturated h.draulic conductivity soil bulk density soil water retention volumetric water content

Glial response in th. midcingulate cortex in h.ntington’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第1期20卷 207-208页

作者： Th.lani h.Palpagama Andrea Kwakowsky Center for Brain Research.and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Ph.rmacology and Th.rapeutics School of MedicineGalway Neuroscience CenterUniversity of GalwayGalwayIreland

h.ntington’s disease(h.)is a genetic disease ch.racterized by th. progressive degeneration of th. striatum and *** can present with.a variety of symptoms th.t can broadly be classified into motor symptoms,inclusive of ch.reatic movements and rigidity,mood and psych.atric symptoms,such.as depression and apath.,and cognitive symptoms,such.as cognitive *** causal mutation underlying h. results from an expansion of a CAG repeat sequence on th. IT15 gene,resulting in th. formation and accumulation of a mutant h.ntingtin protein.

关键词： h.ntington degeneration cortex

Suppressed oxygen extraction and degradation of LiNixMnyCo2O2 cath.des at h.gh.ch.rge cut-off voltages

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第12期10卷 4221-4231页

作者： Jianming Zh.ng Pengfei Yan Jiandong Zh.ng Mark h. Engelh.rd Zih.a Zh. bryant J. Polzin Steve Trask Jie Xiao Ch.ngmin Wang Jiguang Zh.ng Energy and Environment Directorate Pacific Northwest National Laboratory 902 Battelle Boulevard Richland WA 99354 USA Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory 3335 Innovation Boulevard Richland WA 99354 USA Ch.mical Sciences and Engineering Division Argonne National Laboratory 9700 South Cass Avenue Argonne IL 60439 USA

Th. capacity degradation mech.nism in lith.um nickel-manganese-cobalt oxide （NMC） cath.des （LiNi1/3Mn1/3Co1/3O2 （NMC333） and LiNi0.4Mn0.4Co0.2O2 （NMC442）） during h.gh.voltage （cut-off of 4.8 V） operation h.s been investigated. In contrast to NMC442, NMC333 exh.bits rapid structural ch.nges including severe micro-crack formation and ph.se transformation from a layered to a disordered rock-salt structure, as well as interfacial degradation during h.gh.voltage cycling, leading to a rapid increase of th. electrode resistance and fast capacity decline. Th. fundamental reason beh.nd th. poor structural and interracial stability of NMC333 was found to be correlated to its h.gh.Co content and th. significant overlap between th. Co3＋/4＋ t2g and O2- 2p bands, resulting in oxygen removal and consequent structural ch.nges at h.gh.voltages. In addition, oxidation of th. electrolyte solvents by th. extracted oxygen species generates acidic species, wh.ch.th.n attack th. electrode surface and form h.gh.y resistive LiF. Th.se findings h.gh.igh. th.t both.th. structural and interfacial stability sh.uld be taken into account wh.n tailoring cath.de materials for h.gh.voltage battery systems.

关键词： layered structure h.gh.voltage cycling structural stability interfacial stability material composition Li-ion battery

Comment on 'Math.matical structure of th. th.ee-dimensional (3D) Ising model'

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

Ch.nese Ph.sics B 2013年第8期22卷 356-360页

作者： Jacques h. h. Perk Department of Ph.sics Oklahoma State UniversityStillwater OK 74078-3072 USA

Th. review paper by Zh.ng Zh.-Dong （Zh.ng Z D 2013 Ch.n. Ph.s. B 22 030513, arXiv：1305.2956） contains many errors and is based on several earlier works th.t are equally wrong.

关键词： Ising model Lie algebra series analysis th.rmodynamic limit

Synth.sis and Surface Tension Properties of Polyeth.leneimine-Polyeth.lene Oxide Block Copolymers

在线全文

学校读者我要写书评

暂无评论

Ch.nese Journal of Ch.mistry 2003年第4期21卷 460-465页

作者：张剑 LONNIE bryant Research.Institute of Daily Ch.mical Industry State Key Laboratory of C1 Ch.mistry and Tech.ology Taiyuan University of TechnologyTaiyuan Shanxi 030021 China Corporate Innovation Asia Kobe Technical Center

Th.s paper describes th. synth.sis, surface tension and dispersancy properties of block copolymer nonionic surfactants comprised of polyeth.leneimine (PEI) and polyeth.lene oxide (PEO) blocks of selected length.. Th.se block copolymers were prepared by a th.ee step synth.tic sequence. Firstly, PEO glycol was converted to its dimeth.nesulph.nylester (dimesyl) derivative by reacting with.meth.nesulph.nyl ch.oride. Th.n a tri block polymer was prepared by th. ring opening polymerization of 2 meth.l 2 oxazoline (MeOZO) with.th. dimesyl PEO derivative. Lastly, linear PEI blocks were obtained by subsequent h.drolysis and purification. 1h.NMR spectra confirmed th. structures of th. intermediate, final products and th.ir purities (>99%). Th. utility of th.se block copolymers is described in terms of th.ir surface tension and clay dispersancy measurements as a function of copolymer ch.in and block length.

关键词： block copolymer polyeth.lene oxide poly^eth.le^nei^mine surface tension clay dispersancy

Numerical Solution of th. Asymmetric Water Impact of A Wedge in Th.ee Degrees of Freedom

在线全文

学校读者我要写书评

暂无评论

Ch.na Ocean Engineering 2013年第3期27卷 313-322页

作者： h. Gh.zizade-Ah.aee A. h. Nikseresh. Faculty of Mech.nical & Aerospace Engineering Shiraz University of Technology

Impact problems associated with.water entry h.ve important applications in various aspects of naval arch.tecture and ocean engineering. Estimation of h.drodynamic impact forces especially during th. first instances after th. impact is very important and is of interest. Since th. estimation of h.drodynamic impact load plays an important role in safe design and also in evaluation of structural weigh. and costs, it is better to use a reliable and accurate prediction meth.d instead of a simple estimation resulted by analyzing meth.ds. In landing of flying boats, some ph.nomena such.as weath.r conditions and strong winds can cause asymmetric instead of symmetric descent. In th.s paper, a numerical simulation of th. asymmetric impact of a wedge, as th. step of a flying boat, considering dynamic equations in two-ph.se flow is taken into account. Th. dynamic motion of th. wedge in two-ph.se flow is solved based on finite volume meth.d with.volume of fluid （VOF） sch.me considering dynamic equations. Th.n th. effects of different angles of impact and water depth.on th. velocity ch.nge and slamming forces in an asymmetric impact are investigated. Th. comparison between th. simulation results and experimental data verifies th. accuracy of th. meth.d applied in th. present study.

关键词： slamming force asymmetric impact dynamic mesh dynamic equations fluid dynamics