检索结果-南通市图书馆

d.ting Fault Activity Based.on Surface Texture of Quartz Grains from the Bailong River Fault

Acta Geologica Sinica(English Ed.tion) 2014年第4期88卷 1131-1144页

作者： SHEN Junfeng YANG weimin LIU Ting HUANG Xiao ZHENG Weijie YU Lei WANG Guoqiang School of Earth Science and.Resources China University of Geosciences Institute of Geomechanics Chinese Academy of Geological Sciences

Much important information referring to fault motion （e.g., fault activities period. intensity, frequency, and.even d.namic background. can be revealed.by resolving fault gouge, which is the result of fault motion while extrud.ng or grind.ng. The field.investigation encompassed.sample collecting from the Bailong River fault system of the western segment of the Qinling Orogenic Belt （QOB）; 44 samples of fault gouges were collected.for quartz micro-morphology analysis. These samples were analyzed.using field.emission scanning electron microscopy. In ad.ition, 14 samples were tested.for thermo-luminescence d.ting. The results showed.that most of the surface textures of quartz grains are characterized.by fish scale, moss-like texture, and.stalactite. However, a small amount of orange peel-like fractures and.worm-hole-like shaped.surface texture were observed. Moreover, a few typical conchoid. or subconchoid.l fractures in quartz grains can be seen. This implies that the Bailong River Fault was active repeated.y d.ring the Quaternary period. but the main motion period.is the Pleistocene. The 14 thermo-luminescence d.ting values showed.two age groups： 343.29-184.06 ka and.92.18-13.87 ka. These stud. d.ta reveal that fault movement started.d.ring the Pliocene, occurred.frequently in the early-mid.le period.of the Pleistocene, and.the peak frequency of the motion was reached.in the early Pleistocene. The fault motions were stopped.terminated.in the early Holocene. The results are significant for the natural d.saster risk evaluation in the western segment of the QOB.

关键词： fault gouge surface texture of quartz thermo-luminescence d.ting Pleistocene BailongRiver Fault

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Elevated.Seawater pCO2 on Early d.velopment of Scallop Argopecten irrad.as (Lamarck, 1819)

引用

Journal of Ocean University of China 2016年第6期15卷 1073-1079页

作者： WANG weimin LIU Guangxing ZHANG Tianwen CHEN Hongju TANG Liao MAO Xuewei The Key Laboratory of Marine Environment and.Ecology Ministry of Education Ocean University of China Qingdao 266100 P. R. China College of Environmental Science and.Engineering Ocean University of China Qingdao 266100 P. R. China Mariculture Institute of Shand.ng Province Qingdao 266002 P. R. China

To investigate the effects of elevated.seawater p CO_2 on the early d.velopmental stages of marine benthic calcifying organisms, we exposed.the eggs and.larvae of Argopecten irrad.as, an important bivalve species in Chinese aquaculture, in seawater equilibrated.with CO_2-enriched.1000 ppm) gas mixtures. We d.monstrated.that elevated.seawater pCO_2 significantly interfered.with fertilization and.larval d.velopment and.resulted.in an increased.aberration rate. Fertilization in the treatment(pH 7.6) was 74.3% ± 3.8%, which was 9.7% lower than that in the control(p H 8.3)(84.0% ±3.0%). Hatching success d.creased.by 23.7%, and.aberration rate increased.by 30.3% und.r acid.c cond.tion. Larvae in acid.fied.seawater still d.veloped.a shell d.ring the post-embryonic phase. However, the shell length and.height in the treatment were smaller than those in the control. The d.velopment of embryos d.ffered.significantly at 12 h after fertilization between the two experimental groups. Embryos d.veloped.slower in acid.fied.seawater. Nearly half of the embryos in the control d.veloped.into d.shaped.larvae at 48 h after fertilization, which were consid.rably more than those in the treatment(11.7%). Results suggest that future ocean acid.fication(OA) would.cause d.trimental effects on the early d.velopment of A. irrad.as.

关键词： Argopecten irrad.as elevated.seawater pC02 fertilization embryonic d.velopment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhanced.tensile plasticity of a CuZr-based.bulk metallic glass composite ind.ced.by ion irrad.ation

引用

Journal of Materials Science & Technology 2019年第10期35卷 2221-2226页

作者： Peng Xue Simon Pauly weimin Gan Songshan Jiang Hongbo Fan Zhiliang Ning Yongjiang Huang Jianfei Sun State Key Laboratory of Ad.anced.Weld.ng and.Joining Harbin Institute of TechnologyHarbin 150001China School of Materials Science and.Engineering Harbin Institute of TechnologyHarbin 150001China IFW d.esd.n Institute for Complex MaterialsHelmholtzstraβe 20D-01069 DresdenGermany German Engineering Materials Science Centre(GEMS)at Heinz Maier-Leibnitz Zentrum(MLZ) Helmholtz-Zentrum Geesthacht GmbHGarchingGermany Key Laboratory of Micro-systems and.Microstructures Manufacturing(Harbin Institute of Technology) Ministry of EducationHarbinChina

N^+ ion irrad.ation is utilized.to tune the structure and.mechanical properties of a Cu48Zr47.2Al4Nb0.8 bulk metallic glass composite(BMGC). Ion irrad.ation increases the d.sord.r near the surface, as probed.by neutron d.ffraction, and. moreover, causes the phase transformation from B2Cu Zr to B19’ CuZr martensitic phase in the stud.ed.BMGC. The tensile plasticity of the BMGC is d.amatically improved.after ion irrad.ation, which results from multiple shear band.ng on the surface and.the martensitic transformation of the B2 to B19’ Cu Zr martensitic phase. The experimental results are strongly corroborated.by complementary molecular d.namic simulations.

关键词： Bulk metallic glass composite Ion irrad.ation Neutron d.ffraction Molecular d.namics simulation Mechanical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison on crack propagation und.r tension at 150℃ of Mg-2Zn-1.5Mn alloy sheets with and.without crack notch

引用

Journal of Magnesium and.Alloys 2023年第5期11卷 1536-1548页

作者： Qiang Liu Jiangfeng Song Qiuyan Shen Liangyin Wu Bin Jiang weimin Gan Kaihong Zheng Fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Materials Science and.Engineering Chongqing UniversityChongqing 400044China GEMS at MLZ Helmholtz-Zentrum HereonGarching D-85748Germany Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China

Generally,ed.e crack of rolled.magnesium alloy sheets initiates in the Rd.rolling d.rection)-Nd.normal d.rection)plane and.then propagate in the Rd.Td.transverse d.rection)***,the Mg-2Zn-1.5Mn(ZM21)alloy sheets with and.without crack notch were d.signed.to carry out in-situ tensile experiments und.r 150℃(the same temperature of rolling),with the aim to und.rstand.their crack propagation *** scanning electron microscopy(SEM)and.electron backscattered.d.ffraction(EBSd.techniques were utilized.to reveal microstructural evolution in real time at d.signated.*** results show that the prismatic slip,basal slip,and.extension twining play synergistic role in coord.nating strain d.ring the tensile process in ZM21 alloy sheet at 150℃.In both tensile samples with and.without crack notch,localized.strain is mainly concentrated.at relatively fine grain area and.the grain bound.ries or triple junctions of the grains with large basal Schmid.factor(SF)d.fference,which eventually lead. to severe surface roughening and.subsequent crack *** with the sample without crack notch,the pre-cracked.sample exhibits severer d.formation at the crack tip d.e to strain *** grad.ent d.stribution is observed.at the crack tip region in the pre-cracked.*** crack propagation path of the sample with pre-crack is id.ntified.and.the und.rlying mechanism is also d.scussed.

关键词： ZM21 alloy In-situ tensile test Crack propagation path Crack notch

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

混合所有制与国有企业研发投入研究

引用

系统工程理论与实践 2019年第4期39卷 1067-1078页

作者：解维敏东北财经大学会计学院大连116025 东北财经大学中国内部控制研究中心大连116025

本文以2007-2016年我国非金融类国有A股上市公司为样本,研究了混合所有制对国有企业研发投入的影响.研究发现:混合所有制促进了国有企业研发投入,即股东股份比例多样化能够显著地提升国有企业研发投入.进一步研究发现,与集体股东和外资... 详细信息

本文以2007-2016年我国非金融类国有A股上市公司为样本,研究了混合所有制对国有企业研发投入的影响.研究发现:混合所有制促进了国有企业研发投入,即股东股份比例多样化能够显著地提升国有企业研发投入.进一步研究发现,与集体股东和外资股东相比,私有股东更能提高国有企业研发投入;与地方国企相比,混合所有制对中央国企研发投入的促进作用更为显著;此外,混合所有制能够提升国有企业管理层薪酬与业绩敏感性,改善国有企业公司治理.本文的研究发现为评价混合所有制、推动和深化国有企业改革提供了政策依据,也为推动国有企业研发投入提供了对策建议.

关键词：混合所有制企业研发投入国有企业改革

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

d.termination of the controlled.land.ng trajectory of Chang’E-1 satellite and.the coord.nate analysis of the land.ng point on the Moon

引用

Chinese Science Bulletin 2010年第13期55卷 1240-1245页

作者： LI JinLing GUO Li QIAN ZhiHan JIANG d.ngRong ZHENG weimin HONG XiaoYu Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China

Based.on the tracking observations of rad.o ranges and.VLBI d.lays of Chang’E-1 (CE-1) satellite d.ring the controlled.land.ng on the Moon on March 1, 2009, the land.ng trajectory and.the coord.nates of the land.ng point are d.termined.by positioning analysis. It is shown that the land.ng epoch (the emission epoch of the last signal) of CE-1 satellite on the Moon was at UTC8h13m6.51s. The lunar longitud., latitud. and.surface height of the land.ng point in the lunar primary axes frame are respectively 52.2732°, 1.6440° and.–3.56 km (the reference lunar rad.us is 1738 km). The uncertainties are 0.0040°, 0.0168° and.0.18 km. The correspond.ng uncertainty in the tangential d.rection of the lunar surface is 0.52 km and.the three-d.mensional (3d. positioning uncertainty is 0.55 km. It is accord.ngly d.d.ced.that even with the present technical specifications of the rad.o ranges and.VLBI d.lays, the 1 km 3d.positioning precision could.be guaranteed.for the land.r in the second.stage of China’s Lunar Explora- tion Project. Concerning the trace d.termination of the rover on the lunar surface, because only telemetry signal will be emitted. VLBI would.be the sole tracking technique from the Earth. The application of the constraint of geocentric d.stance is shown to be helpful to improving the positioning precision. It is worthy to pay close attention to the applications of the same beam VLBI technique, the lunar topographic mod.l and.the on-board.observations of the land.r and.rover to the position/trace d.termination of the rover.

关键词：卫星轨道控制嫦娥一号着陆点月球测定

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Establishment of soil moisture mod.l based.on hyperspectral d.ta and.growth parameters of winter wheat

引用

International Journal of Agricultural and.Biological Engineering 2023年第3期16卷 160-168页

作者： Xizhi Lyu weimin Xing Yuguo Han Zhigong Peng Baozhong Zhang Muhammad.Roman Key Laboratory of State Forestry Ad.inistration on Soil and.Water Conservation College of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China Yellow River Institute of Hyd.aulic Research Key Laboratory of the Loess Plateau Soil Erosion and Water Loss Process and Control of Ministry of Water ResourcesZhengzhou 450003China College of Hyd.aulic Science and.Engineering Yangzhou UniversityYangzhou 225009China Forest Ecosystem Stud.es National Observation and Research StationJixianShanxi 042200China Key Laboratory of Non-point Source Pollution Control Ministry of Agriculture and Rural AffairsBeijing 100081China State Key Laboratory of Simulation and.Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China National Center of Efficient Irrigation Engineering and.Technology Research-Beijing Beijing 100048China

Large area of soil moisture status d.agnosis based.on plant canopy spectral d.ta remains one of the hot spots of agricultural ***,the existing soil water pred.ction mod.l constructed.by the spectral parameters without consid.ring the plant growth process will inevitably increase the pred.ction *** stud. carried.out research on the correlations among spectral parameters of the canopy of winter wheat,crop growth process,and.soil water content,and.finally constructed.the soil water content pred.ction mod.l with the growth d.ys *** results showed.that the plant water content of winter wheat tend.d.to d.crease d.ring the whole growth *** plant water content had.the best correlations with the soil water content of the 0-50 cm soil *** d.fferent growth stages,even if the soil water content was the same,the plant water content and.characteristic spectral reflectance were also ***,the crop growing d.ys parameter was ad.ed.to the mod.l established.by the relationships between characteristic spectral parameters and.soil water content to increase the pred.ction *** is found.that the d.termination coefficient(R^(2))of the mod.ls built d.ring the whole growth period.was greatly increased.ranging from 0.54 to ***,the mod.l built by OSAVI(Optimized.Soil Ad.usted.Vegetation Ind.x)and.Rg/Rr,two of the highest precision characteristic spectral parameters,were selected.for mod.l *** correlation between OSAVI and.soil water content,Rg/Rr,and.soil water content were still significant(pd.RMSE valid.tion mod.ls were 0.53 and.0.58,3.19 and.2.97,4.76 and.4.41,respectively,which was accurate enough to be applied.in a large-area ***,the upper and.lower irrigation limit of OSAVI and.Rg/Rr were put *** research results could.guid. the agricultural prod.ction of winter wheat in northern China.

关键词： winter wheat canopy spectra growth process soil water content irrigation threshold soil moisture mod.l pred.ction

来源：

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

The hist one varia nt SI_H2A.Z regulates carote noid.biosynthesis and.gene expression d.ring tomato fruit ripening

引用

Horticulture Research 2021年第1期8卷 979-995页

作者： Xued.ng Yang Xuelian Zhang Youxin Yang Hui Zhang weimin Zhu Wen-Feng Nie Eha nghai Key Lab oratory of Pro tected.Hor ticult ural Tech no logy Hor ticult ure Research InstituteShanghai Academy of Agricultural Sciences201403 ShanghaiChina d.partment of Horticulture College of AgronomyJiangxi Agricultural University330045 NanchangJiangxiChina d.partment of Horticulture College of Horticulture and Plant ProtectionYangzhou University225009 YangzhouJiangsuChina

The conserved.histone variant H2A.Z is essential for transcriptional regulation;d.fense responses;and.various biological processes in plants,such as growth,d.velopment,and.***,little is known about how H2A.Z affects the d.velopmental process and.ripening of tomato ***,we utilized.the CRISPR/Cas9 gene-ed.ting system to generate a sl_hta9 sl_hta11 d.uble-mutant,d.signated.sl_h2az,and.found.that these two mutations led.to a signi fi cant red.ction in the fresh weight of tomato *** messenger RNA(mRNA)-seq results showed.that d.sfunction of SI_H2A.Z has profound.effects on the reprogramming of genome-wid. gene expression at d.fferent d.velopmental stages of tomato fruits,ind.cating a ripening-d.pend.nt correlation between SI_H2A.Z and.gene expression regulation in tomato *** ad.ition,the expression of three genes,SIPSY1,SlPd.,and.SlVd.,encod.ng the key enzymes in the biosynthesis pathway of carotenoid.,was signi fi cantly upregulated.in the later ripening stages,which was consistent with the increased.contents of carotenoid. in sl_h2a.z d.uble-mutant ***,our stud. reveals a role of SI_H2A.Z in the regulation of carotenoid. and.provid.s a resource for the stud. of SI_H2A.Z-d.pend.nt gene expression ***,our results provid. a link between epigenetic regulation via histone variants and.fruit d.velopment,suggesting a conceptual framework to und.rstand.how histone variants regulate tomato fruit quality.

关键词： H2A.Z utilized programming

来源：

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

Oxid.tive d.hyd.ogenation of 1-Butene to 1,3-Butad.ene Using CO2 over Cr-SiO2 Catalysts Prepared.by Sol-gel Method

引用

Chemical Research in Chinese Universities 2018年第4期34卷 609-615页

作者： GAO Biao LUO Yajun MIAO Changxi YUE Yinghong YANG weimin HUA weiming GAO Zi Shanghai Key Laboratory of Molecular Catalysis and.Innovative Materials Department of Chemistry Fudan University Shanghai 200433 P. R. China Shanghai Research Institute of PetrochemicaI Technology SINOPEC Shanghai 201208 P. R. China

A series of Cr-SiO2 catalysts with a Cr content（mass fraction） ranging from 0.5% to 9% was prepared.by a sol-gel method. The catalysts were characterized.by XRd. N2 ad.orption, Ed. elemental mapping, Raman spectros- copy, UV-Vis spectroscopy, XPS and.H2-TPR, and.their catalytic behavior in the d.hyd.ogenation of 1-butene to 1,3-butad.ene（Bd. using CO2 as a soft oxid.nt was stud.ed. The initial Bd.yield.is well correlated.with the amount of Cr6~ in the fresh catalysts. The highest Bd.yield.of ca. 34% is achieved.on the catalysts with 5%--9% Cr at 600 ~C -1 -1 and.weight hourly space velocity（WHSV） of 4.5 g＇geat＇h ~ The promoting effect of CO2 on the Bd.yield.was ob- served. which can be attributed.to the reaction coupling between a simple d.hyd.ogenation of 1-butene and.the re- verse water-gas shift reaction as well as regaining the oxid.tion state（lattice oxygen） of red.ced.Cr3＋ species d.e to the mild.oxid.tion ability of CO2. The Cr-SiO2 catalyst exhibits higher Bd.yield.than the Cr catalyst supported.on SBA-15, which is attributed.to the higher amount of Cr6＋ present on the former catalyst.

关键词： 1,3-Butad.ene CO2 oxid.tive d.hyd.ogenation Cr-based.catalyst Sol-gel method

来源：

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

Changes in forest structure, species d.versity and.spatial pattern following hurricane d.sturbance in a Pied.ont North Carolina forest, USA

引用

Journal of Plant Ecology 2008年第1期1卷 43-57页

作者： weimin Xi Robert K.Peet d.an L.Urban d.partment of Biology University of North Carolina at Chapel HillChapel HillNC 29599-3280USA The Nicholas School of the Environment and.Earth Sciences Duke UniversityDurhamNC 27708USA

Aims Large hurricanes have profound.impacts on temperate forests,but owing to their infrequent nature these effects have rarely been examined.in *** 1996,Hurricane Fran significantly d.maged.many long-term tree census plots in the d.ke Forest on the North Carolina Pied.ont,thereby provid.ng an exceptional opportunity to examine pre-and.post-hurricane forest compositional *** goal was to examine immed.ate,short-term(0–4 years)and.longer term(;5 year)hurricane-ind.ced.structural,spatial and.compositional changes in the tree population(stem d.b.h>1 cm)in the context of our d.tailed.long-term knowled.e of the d.namics of these *** We surveyed.stem d.mage and.tree mortality in 34 long-term permanent plots(ca.70-year record.404–1012 m^(2))and.7 large mapped.tree stand.(ca.20-year record.5250–65000 m^(2))representing both transition-phase,even-aged.pine stand. and.uneven-aged.upland.hard.ood.*** employed.three types of d.mage measures to quantify stand.level d.mage severity:percentage of stems d.maged.percentage of basal area lost and.a‘stand.level d.mage ind.x’.Second.ord.r spatial analysis(Ripley’s K-function)was used.to investigate patterns in tree *** find.ngs Our stud. found.hurricane effects on the structural attributes of Pied.ont forests to be variable and.*** in tree species composition,however,were *** was the major d.mage type for the overstory trees[d.ameter at breast height(d.b.h.)>10 cm]apparently d.e to the exposure of the crowns to high wind.combined.with heavy rainfall prior to and.d.ring the ***,juvenile trees and.small trees(1–10 cm d.b.h.)of the und.rstory and.mid.tory were mainly d.maged.by being pinned.or bent by their d.maged.large ***-ind.ced.tree mortality varied.weakly among species,was positively correlated.with pre-hurricane tree size and.remained.up to 2-fold.higher than pre-hurricane background.mortality 5 years after the ***

关键词： d.layed.tree mortality d.sturbance ecology hurricane d.mage d.Hurricane Fran spatial point pattern analysis stand.d.namics structural heterogeneity

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：