检索结果-南通市图书馆

Chinese Chemical Letters 2024年第8期35卷 549-553页

作者： Guo-Hong Gao run-ze zhao Ya-Jun Wang Xiao Ma Yan Li Jian Zhang Ji-Sen Li School of Chemistry Chemical Engineering and MaterialsJining UniversityQufu 273155China Institute of Physical Education Jining UniversityQufu 273155China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Searching for efficient nonprecious metal-based catalysts toward oxygen evolution reaction(OER)are of significance for seawater ***,a core-shell-structured hybrid of cobalt phosphide nanowires@NiFe layered double hydroxide nanosheets grown on conductive nickel foam(CoP@NiFe LDH/NF)is prepared by a feasible approach at low *** charming structure can provide numerous phosphide/hydroxide heterogenous interfaces,expose abundant active sites,and boost elec-tron/mass transfer,synergistically enhancing catalytic OER *** employed as an electrocatalyst toward the OER,the resultant CoP@NiFe LDH/NF only requires a small overpotential of 287 mV to pro-vide 300 mA/cm^(2)current density as well as long-time durability in 1.0 mol/L KOH *** regula-tion of electronic states and surface reconstruction synergistically contribute to highly efficient seawater *** work provides an opportunity to construct efficient and inexpensive electrocatalysts for hydrogen production.

关键词： Cobalt phosphide NiFe layered double hydroxide Interfacial engineering Oxygen evolution reaction Seawater oxidation

在线全文

学校读者我要写书评

暂无评论

经济政策不确定性与股票风险特征

管理科学学报 2018年第4期21卷 1-27页

作者：陈国进张润泽赵向琴厦门大学经济学院金融系厦门361005 厦门大学王亚南经济研究院厦门361005 国信证券博士后工作站深圳518001

构建了包含经济政策不确定性的随机贴现模型,通过参数校准、静态比较等方法,探讨了不同政策不确定性下股票风险的动态特征.在此基础上,通过实证模拟分析政策不确定性影响股票风险的传导机制,并通过组合分析法检验政策不确定性在股票风... 详细信息

构建了包含经济政策不确定性的随机贴现模型,通过参数校准、静态比较等方法,探讨了不同政策不确定性下股票风险的动态特征.在此基础上,通过实证模拟分析政策不确定性影响股票风险的传导机制,并通过组合分析法检验政策不确定性在股票风险形成中的作用,以此验证该理论模型在中国的适用性.最后,运用面板数据回归模型对政策不确定性与股票风险的关系进行量化分析.结果表明:1)政策不确定性能够通过企业现金流、贴现因子和相关系数等途径提高股票风险,该效应在控制传统风险因子、企业异质性因素和外部环境因素后依然显著;2)具有非国有性质、较低盈利能力和低资产增长率的企业股票更易受政策不确定性的影响;3)在经济萧条和改革幅度较大的阶段,政策不确定性对股票风险的溢出效应显著增强.

关键词：经济政策不确定性股票风险传导机制面板回归

基于GMPE模块OCT与眼底彩色照相法测量客观眼球旋转度的比较

在线全文

学校读者我要写书评

暂无评论

国际眼科杂志 2022年第8期22卷 1396-1401页

作者：李娜敏郭长梅张璐赵润泽张桂鸥朱锦婷孙董洁惠延年窦国睿空军军医大学西京医院眼科陕西省西安市710032

目的:比较基于GMPE模块光学相干断层扫描(OCT)与传统眼底彩色照相法(FCP)测量客观眼球旋转度的一致性和可行性。方法:纳入2020-12/2021-03我院斜弱视门诊受检者,同一天用基于GMPE模块OCT与FCP两种方法测量客观眼球旋转度。FCP使用Adobe ... 详细信息

目的:比较基于GMPE模块光学相干断层扫描(OCT)与传统眼底彩色照相法(FCP)测量客观眼球旋转度的一致性和可行性。方法:纳入2020-12/2021-03我院斜弱视门诊受检者,同一天用基于GMPE模块OCT与FCP两种方法测量客观眼球旋转度。FCP使用Adobe Photoshop软件手动定位测量黄斑中心凹-视盘中心夹角度数(FDA),基于GMPE模块OCT软件自动定位黄斑和视盘中心测量FDA。结果:纳入55例受检者,OCT测量FDA分别为右-6.6°±4.5°和左-8.8°±4.7°,FCP测量FDA分别为右-6.6°±4.7°和左-8.4°±4.1°,两种方法测量结果无差异(P_(右眼)=0.90,P_(左眼)=0.08)。外斜视患者OCT测量FDA分别为右-5.8°±4.9°和左-9.1°±4.5°,FCP测量FDA分别为右-5.7°±5.0°和左-8.6°±4.3°(P_(右眼)=0.75,P_(左眼)=0.15)。类似地,内斜视患者OCT测量FDA分别为右-9.0°±7.3°和左-11.3°±3.5°,而FCP测量FDA分别为右-10.0°±7.0°和左-10.1°±2.8°(P_(右眼)=0.21,P_(左眼)=0.10),两种测量方法在内外斜视患者中均无差异(P>0.05)。Pearson检验及Bland-Altman分析两种方法的结果高度相关一致(r_(右眼)=0.93,r_(左眼)=0.94,均P<0.01)。结论:基于GMPE模块OCT可用于客观眼球旋转度的测量,且可信度及重复度高,临床有望替代眼底彩色照相法。

关键词：客观眼球旋转度光学相干断层扫描(OCT) 眼底彩色照相 Adobe Photoshop软件

Comparison Between χ~2 and Bayesian Statistics with Considering the Redshift Dependence of Stretch and Color from JLA Data

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第9期71卷 1097-1108页

作者： ze zhao School of Physical Sciences University of Chinese Academy of Sciences CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Kavli Institute for Theoretical Physics China Chinese Academy of Sciences

In this work, we compare the impacts given by χ^2 statistics and Bayesian statistics. Bayesian statistics is a new statistical method proposed by [C. Ma, P. S. Corasaniti, and B. A. Bassett, arXiv:1603.08519[***](2016)]recently, which gives a fully account for the standard-candle parameter dependence of the data covariance matrix. For this two statistical methods, we explore the possible redshift-dependence of stretch-luminosity parameter α and colorluminosity parameter β by using redshift tomography. By constraining the ΛCDM model, we check the consistency of cosmology-fit results given by the SN sample of each redshift bin. We also adopt the linear parametrization to explore the possible evolution of α and β and the deceleration parameter q(z) for CPL, JBP, BA and Wang models. We find that:(i) Using the full JLA data, at high redshift α has a trend of decreasing at more than 1.5σ confidence level(CL),and β has a significant trend of decreasing at more than 19σ CL.(ii) Compared with χ^2 statistics(constant α, β) and Bayesian statistics(constant α, β), Bayesian statistics(linear α and β) yields a larger best-fit value of fractional matter density ?m0 from JLA+CMB+GC data, which is much closer to slightly deviates from the best-fit result given by other cosmological observations.(iii) The figure of merit(FoM) given by JLA+CMB+GC data from Bayesian statistics is also larger than the FoM from χ^2 statistics, which indicates that former statistics has a better accuracy.(iv) q(z) given by both statistical methods favor an eternal cosmic acceleration at 1σ CL.

关键词： cosmology dark energy observations cosmological parameters supernova

Diagnosing holographic type dark energy models with the Statefinder hierarchy, composite null diagnostic and w-w′pair

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2018年第3期61卷 65-76页

作者： ze zhao Shuang Wang CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Physical Science University of Chinese Academy of Sciences School of Astronomy and Space Science Sun Yat-Sen University

The main purpose of this work is to distinguish various holographic type dark energy （DE） models, including the AHDE, HDE, NADE, and RDE model, by using various diagnostic tools. The first diagnostic tool is the Statefinder hierarchy, in which the evolution of Statefinder hierarchy parmeter S3（1）（z） and S4（1）（z） are studied. The second is composite null diagnostic （CND）, in which the trajectories of {S（1）4, ∈} and {S4（1）, e} are investigated, where ∈ is the fractional growth parameter. The last is w-w′ analysis, where w is the equation of state for DE and the prime denotes derivative with respect to lna. In the analysis we consider two cases： varying current fractional DE density Ωde0 and varying DE model parameter C. We find that：（1） both the Statefinder S4（1） can lead to larger hierarchy and the CND have qualitative impact on AHDE, but only have quantitative impact on HDE. （2） S4（1） differences than S 4（1）, while the CND pair has a stronger ability to distinguish different models than the Statefinder hierarchy. （3） For the case of varying C, the {w, w′} pair has qualitative impact on AHDE; for the case of varying Ωde0, the {w, w′} pair only has quantitative impact; these results are different from the cases of HDE, RDE, and NADE, in which the {w, w′} pair only has quantitative impact on these models. In conclusion, compared with HDE, RDE, and NADE, the AHDE model can be easily distinguished by using these diagnostic tools.

关键词： dark energy cosmology cosmological constant

New Multipole Method for 3-D Capacitance Extraction

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2004年第4期19卷 544-549页

作者： zhao-ZhiYang ze-YiWang DepartmentofComputerScienceandTechnology TsinghuaUniversityBeijing100084P.R.China

This paper describes an efficient improvement of the multipole accelerated boundary element method for 3-D capacitance extraction. The overall relations between the positions of 2-D boundary elements are considered instead of only the relations between the center-points of the elements, and a new method of cube partitioning is introduced. Numerical results are presented to demonstrate that the method is accurate and has nearly linear computational growth as O(n), where n is the number of panels/boundary elements. The proposed method is more accurate and much faster than Fastcap.

关键词： 3-D interconnect parasitic capacitance extraction IBEM (indirect boundary element method) electronic design automation parasitic parameter extraction VLSI simulation verification

Evaluation of the early defoliation trait and identification of resistance genes through a comprehensive transcriptome analysis in pears

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 Integrative Agriculture 2023年第1期22卷 120-138页

作者： SHAN Yan-fei LI Meng-yan WANG run-ze LI Xiao-gang LIN Jing LI Jia-ming zhao Ke-jiao WU Jun College of Horticulture/State Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural UniversityNanjing 210095P.R.China Institute of Horticulture Jiangsu Academy of Agricultural Sciences/Jiangsu Key Laboratory for Horticultural Crop Genetic ImprovementNanjing 210095P.R.China

Early defoliation,which usually occurs during summer in pear trees,is gradually becoming a major problem that poses a serious threat to the pear industry in southern ***,there is no system for evaluating the responses of different cultivars to early defoliation,and our knowledge of the potential molecular regulation of the genes underlying this phenomenon is still *** this study,we conducted field investigations of 155 pear accessions to assess their resistance or susceptibility to early defoliation.A total of 126 accessions were found to be susceptible to early defoliation,and only 29 accessions were *** them,19 resistant accessions belong to the sand pear species(Pyrus pyrifolia).To identify the resistance genes related to early defoliation,the healthy and diseased samples of two sand pear accessions,namely,the resistant early defoliation accession‘Whasan’and the susceptible early defoliation accession‘Cuiguan’,were used to perform RNA *** with‘Cuiguan’,a total of 444 genes were uniquely differentially expressed in‘Whasan’.Combined with GO and KEGG enrichment analyses,we found that early defoliation was closely related to the stress ***,a weighted gene co-expression network analysis revealed a high correlation of WRKY and ethylene responsive factor(ERF)transcription factors with early defoliation *** study provides useful resistant germplasm resources and new insights into potentially essential genes that respond to early defoliation in pears,which may facilitate a better understanding of the resistance mechanism and molecular breeding of resistant pear cultivars.

关键词： pear early defoliation resistance and susceptibility evaluation RNA-seq WRKY ERF

CO_(2)geological sequestration potential of the low-rank coals in the southern margin of the Junggar Basin

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2023年第3期17卷 727-738页

作者： Qun zhao ze DENG Meng zhao Dexun LIU Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China PetroChina Southwest Oil&Gasfield Company Chengdu 610051China

Carbon capture,utilization,and storage(CCUS)is considered one of the most effective measures to achieve net-zero carbon emissions by 2050,and low-rank coal reservoirs are commonly recognized as potential CO_(2)storage sites for carbon *** evaluate the geological CO_(2)sequestration potential of the low-rank coal reservoirs in the southern margin of the Junggar Basin,multiple experiments were performed on coal samples from that area,including high-pressure mercury porosimetry,low-temperature N2 adsorption,overburden porosity and permeability measurements,and high-pressure CH4 and CO_(2)isothermal adsorption *** with the geological properties of the potential reservoir,including coal seam development and hydrodynamic characteristics,the areas between Santun River and Sigong River in the Junggar Basin were found to be suitable for CO_(2)***,the coal-bearing strata from Santun River to Sigong River can be defined as“potentially favorable areas for CO_(2)eequetfraiion”To better guide the future field test of CO_(2)storage in these areas,three CO_(2)sequestration modes were defined:1)the broad syncline and faulted anticline mode;2)the monoclinic mode;3)the syncline and strike-slip fault mode.

关键词： CO_(2)geological sequestration coalbed methane low-rank coal coal reservoir Junggar Basin

A review of composition evolution in Ni-based single crystal superalloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第9期44卷 76-95页

作者： Wanshun Xia Xinbao zhao Liang Yue ze Zhang Institute of Superalloys Science and Technology School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Center of Electron Miscroscopy Zhejiang UniversityHangzhou310027China

Due to the outstanding creep performance, nickel-based single crystal superalloys(Ni-SXs) are extensively applied in modern aero-engine and industrial gas turbine. Apart from the special single crystal structure which is disadvantageous to extension of creep cracks, Ni-SXs derive the creep strength from intrinsic two-phase microstructure(γ phase and γ’ phase). Main microstructural parameters including volume fraction of γ’ phase and the lattice misfit, and the formation and distribution of precipitated phase are determined by the compositions of alloys. Besides, the creep properties are greatly influenced by these microstructural parameters and precipitated phase. This review has summarized the relationships between different alloying elements and microstructures and indicated their influence on creep properties of Ni-SXs. In addition, with the improvements of experimental methods and characterization technique, some recent discoveries have provided additional evidence to support or challenge the pervious creep theories of superalloys. In view of these new discoveries, this review has provided some perspectives which can be referenced in future compositional design of Ni-SXs.

关键词： Nickel-based single crystal superalloys Composition Creep properties Refractory elements

Adsorption and Diffusion of Hydrogen Atom on Low-index Ag Planes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第10期24卷 1217-1223页

作者： ZHANG Jing DIAO zhao-Yu WANG ze-Xin Department of Chemistry Shandong Normal University Jinan 250014 China

The 5-parameter Morse potential （5-MP） of the interaction between H atom and Ag surfaces has been constructed. The adsorption and diffusion of H on Ag low-index surfaces are investigated with 5-MP in detail. The characteristics of critical points are obtained. The theoretical results show that H atom can only adsorb at the three-fold site on Ag（111 ）; the quasi-3-fold site and long-bridge site are stable adsorption sites on Ag（110） surface for the H atom, and at low coverage hydrogen predominantly occupies the quasi-3-fold site. This work predicts that the four-fold hollow site is the most stable adsorption state for H atom on Ag（100）. The results of this work are approved by the experimental and theoretical results.

关键词： H-Ag system 5-MP adsorption vibration low-index surfaces