检索结果-南通市图书馆

Spatio-temporal variation of hydrological drought under climate change during the period 1960–2013 in the Hexi Corridor, China

引用

Journal of Arid Land 2016年第2期8卷 157-171页

作者： GAO liming Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of SciencesLanzhou 730000China Gansu Data Engineering and Technology Research Center for Resources and Environment Lanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

In recent years, climate change has been aggravated in many regions of the wodd. The Hexi Corridor is located in the semiarid climate zone of Northwest China, which is parUculady affected by climate change. Climate change has led to the spatial and temporal variations of temperature and precipitation, which may result in hydrological drought and water shortage. Thus, it is necessary to explore and assess the drought characteristics of river systems in this area. The patterns of hydrological drought in the Hexi Corridor were identified using the streamflow drought index （SDI） and standardized precipitation index at 12-month timescale （SPI12） from 1960 to 2013. The evolution of drought was obtained by the Mann-Kendall test and wavelet transform method. The results showed that both the mean annual SDI and SPI12 series in the Hexi Corridor exhibited an increasing trend during the study period. According to the results of wavelet analysis, we divided the study period into two segments, i.e. before and after 1990. Before 1990, the occurrence of droughts showing decreased SDI and SPI12 was concentrated in the northern part of the corridor and shifted to the eastern part of the corridor after 1990. The probability of drought after 1990 in Shule River basin decreased while increased in Shiyang River basin. The wavelet analysis results showed that Shiyang River basin will be the first area to go through the next drought period. Additionally, the relationships between drought pattern and climate indices were analyzed. The enhanced westedy winds and increased precipitation and glacier runoff were the main reasons of wet trend in the Hexi Corridor. However, the uneven spatial variations of precipitation, temperature and glacier runoff led to the difference of hydrological drought variations between the Shule, Heihe and Shiyang River basins.

关键词： Hcxi Corridor , sUramflow drought index standardized precipitation index westerly index glacier runoff temperature

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

Pharmacokinetics of monoclonal antibodies ]nd Fc-fusion proteins

引用

Protein & Cell 2018年第1期9卷 15-32页

作者： liming Liu Department of Pharmacokinetics Pharrnacodynamics and Drug Metabolism MRL West Point PA 19486 USA

There are many factors that can influence the pharma- cokinetics （PK） of a mAb or Fc-fusion molecule with the primary determinant being FcRn-mediatad recycling. Through Fab or Fc engineering, IgG-FcRn interaction can be used to generate a variety of therapeutic anti. bodies with significantly enhanced half-life or ability to remove unwanted antigen from circulation, Glycosyla- tion of a mAb or *** protein can have a significant impact on the PK of these molecules, mAb charge can be important and variants with pl values of 1-2 unit difference are likely to impact PK with lower pl values being favorable for a longer ***. Most mAbs display target mediated drug disposition （TMOO）, which can have significant consequences on the study designs of preclinical and clinical studies. The PK of mAb can also be influenced by anti-drug antibody （ADA） response and *** binding, which require careful consideration during the discovery stage, mAbs are primarily absor- bed through the lymphatics via convection and can be conveniently administered by the subcutaneous （sc） route in large doses/volumes with co-formulation of hyaluronidase. The human PK of a mAb can be rea- sonably estimated using cynomolgus monkey data and allometric scaling methods.

关键词： monoclonal antibody (mAb) Fc-fusionprotein pharmacokineUcs FcRn target-mediated drugdisposition (TMDD) glycosylation anti-drug antibody (ADA)human PK prediction

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

FEM Analysis on Acoustic Performance of Wall Flow Diesel Particulate Filters

引用

Chinese Journal of Mechanical Engineering 2011年第4期24卷 701-706页

作者： GAO Wenzhi FENG liming State Key Laboratory of Engines Tianjin University Tianjin 300072 China

Diesel powered vehicles, in compliance with the more strict exhaust emission standards such as Euro V, is likely to require a diesel particulate filter （DPF）. A DPF used on a vehicle will affect the acoustic emission of the diesel engine, so it is important to investigate the sound propagation rule in DPF and further to propose the optimum DPF design. However, due to the geometrical complexity of the DPF, the traditional analysis method, such as analytical method, can not assess the acoustic performance of DPF accurately in medium and high frequency band. In this paper, a combined approach of finite element analysis and viscosity correction is proposed to predict acoustic performance of DPF. A simplified model of the full DPF is established and is used to analyze the sound propagation characteristic of the DPF. The distribution of the sound pressure and velocity, the transmission matrix of the DPF are obtained using the finite element method. In addition, the method of the viscosity correction is used in the transmission matrix of the DPF to evaluate the acoustic performance of DPF. Based on the FEM computation and the viscosity correction, the transmission losses under the rated load and idle condition of a diesel engine are calculated. The calculation results show that DPF can effectively attenuate exhaust noise, and sound attenuation increase with the rise of the frequency. Sound attenuation is better under rated condition than idle condition of diesel engine, particularly in frequency above 1 000 Hz.

关键词： diesel particulate filter acoustic performance FEM model viscosity correction

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

Coalescence of pore columns by domain switching

引用

Acta Mechanica Sinica 2006年第3期22卷 207-216页

作者： liming Geng Wei Yang Department of Engineering Mechanics Tsinghua University Beijing 100084 China

The present paper studies the coalescence of pore columns in ferroelectric ceramics driven by back and forth domain switching under cyclic electric field. A finite element method that incorporates mass transfer capacity is formulated to simulate the evolution of point defects subjected to the kinetics of pore surface diffusion and domain wall migration. The merge of point defects provides a mechanism for the vacancy agglomeration that leads to the formation of large pores or microcracks.

关键词： Point defect Ferroelectrics Domain switch Coalescence Structural evolution Finite element

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

Textile-Based Thermoelectric Generators and Their Applications

引用

Energy & Environmental Materials 2020年第1期3卷 67-79页

作者： liming Wang Kun Zhang Key Laboratory of Textile Science&Technology of Ministry of Education College of TextilesDonghua UniversityShanghai China

With the rapid development of Internet of Things and miniaturized electronics, the demand for wearable power sources with high reliability and long duty cycle promotes the exploration of wearable thermoelectric generators(TEGs). In particular, textile-based TEGs that can perpetually convert the ubiquitous temperature gradient between human body and ambience into electrical energy have attracted intensive attention to *** lightweight and three-dimensional deformable TEGs comprised of fibers, filaments, yarns, or fabrics offer unique merits as wearable power source in comparison with conventional TEGs. In this review, we systematically summarize the state-of-the-art strategies for textile-based TEGs, including the structure design, fabrication, device performance, and application. Existing critical issues and future research emphasis are also discussed.

关键词： architecture passive sensing peltier cooling textile thermoelectric generator

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

Asymptotic analysis of multi-valley dark soliton solutions in defocusing coupled Hirota equations

引用

Communications in Theoretical Physics 2023年第11期75卷 38-48页

作者： Ziwei Jiang liming Ling Department of Mathematics South China University of TechnologyGuangzhou 510641China

We construct uniform expressions of such dark soliton solutions encompassing both single-valley and double-valley dark solitons for the defocusing coupled Hirota equation with high-order nonlinear effects utilizing the uniform Darboux transformation,in addition to proposing a sufficient condition for the existence of the above dark soliton ***,the asymptotic analysis we perform reveals that collisions for single-valley dark solitons typically exhibit elastic behavior;however,collisions for double-valley dark solitons are generally *** light of this,we further propose a sufficient condition for the elastic collisions of double-valley dark soliton *** results offer valuable insights into the dynamics of dark soliton solutions in the defocusing coupled Hirota equation and can contribute to the advancement of studies in nonlinear optics.

关键词： coupled Hirota equation uniform Darboux transformation dark soliton solution asymptotic analysis

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

Sharpness of the paired 660-km discontinuity beneath the Izu-Bonin area

引用

Earth and Planetary Physics 2020年第6期4卷 627-638页

作者： liming Wang XiaoBo He Department of Marine Sciences Zhejiang UniversityZhoushan Zhejiang 316021China Marine Acoustics and Remote Sensing Laboratory Zhejiang Ocean UniversityZhoushan Zhejiang 316022China

The 660-km discontinuity that separates the Earth's upper and lower mantle has primarily been attributed to phase changes in olivine and other *** the sharpness is essential for predicting the composition of the mantle and for understanding its dynamic *** this study,we used S-to-P conversions from the 660-km interface,termed S660P,arriving in the P-wave coda from one earthquake in the Izu–Bonin subduction zone recorded by stations in *** S660P signals were of high quality,providing us an unprecedented opportunity to resolve the sharpness of the *** study demonstrated,based on the impedance contrast given by the IASP91 model,that the discontinuity has a transitional thickness of^5 *** addition,we observed a prominent arrival right after the S660P,which was best explained by S-to-P conversions from a deeper discontinuity at a depth of^720 km with a transitional thickness of^20 km,termed *** 720-km discontinuity is most likely the result of a phase transition from majoritic garnet to perovskite in the segregated oceanic crust(mainly the mid-oceanic ridge basalt composition)at the uppermost lower mantle beneath this *** inferred phase changes are also consistent with predictions from mineral physics experiments.

关键词： 660-km discontinuity S-to-P conversions Izu-Bonin sharpness mid-oceanic ridge basalt

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

Automorphism groups of finite-dimensional special odd Hamiltonian superalgebras in prime characteristic

引用

Frontiers of Mathematics in China 2012年第5期7卷 907-918页

作者： liming TANG Wende LIU Department of Mathematics Harbin Institute of Technology Harbin 150006 China School of Mathematical Sciences Harbin Normal University Harbin 150025 China

This paper is devoted to a study of the automorphism groups of three series of finite-dimensional special odd Hamiltonian superalgebras g over a field of prime characteristic. Our aim is to characterize the connections between the automorphism groups of g and the automorphism groups of the corresponding underlying superalgebras. Precisely speaking, we embed the former into the later. Moreover, we determine the images of the normal series of the automorphism groups and homogeneous automorphism groups of g under the embedded mapping.

关键词： Special odd Hamiltonian superalgebras automorphism group

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

Recent advances in the rational design of single-atom catalysts for electrochemical CO_(2) reduction

引用

Nano Research 2022年第11期15卷 9747-9763页

作者： Huoliang Gu Jing Wu liming Zhang Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200438China

Electrochemical CO_(2) reduction(CO_(2)R)represents a sustainable way to store intermittent renewable energies and produce carbon-neutral fuels,yet the energy efficiency remains a huge bottleneck owning to its sluggish kinetics and complex reaction *** active,selective,and robust electrocatalysts are strongly demanded to accelerate CO_(2) conversion and deploy this technology to practical *** this review,we focus on single-atom catalysts(SACs),a unique category of electrocatalysts with atomically dispersed metal active sites,which have shown distinctive performances in CO_(2)R and offer an ideal platform for in-depth mechanistic studies at the atomic *** various SACs with attractive CO_(2)R performances have been reported,the relationship between electronic/geometric structure of SACs and the corresponding electrocatalytic performance still needs to be discussed with *** we take a broad overview on the recent progress in understanding the structure–function correlation of SACs in CO_(2)R,with the purpose of providing deep insights and guiding the future rational design of ***,we provide the fundamental understandings of CO_(2)R on SACs,following different reaction ***,we describe the progresses in the development of well-defined SACs and the mechanistic studies on the influences from particular structural parameters,such as first-shell and second-sphere coordination,conductive supports and interface with a secondary ***,some perspectives are highlighted on the path towards efficient CO_(2)R on SACs.

关键词： single-atom catalysts electrochemical CO_(2)reduction structure-function correlation rational design

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

Transmission Efficiency of Different Shielding Structures in Wireless Power Transfer Systems for Electric Vehicles

引用

CSEE Journal of Power and Energy Systems 2021年第6期7卷 1247-1255页

作者： Jianchao Li Fanghui Yin liming Wang Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteTsinghua UniversityShenzhen 518055China the Graduate School at Shenzhen Tsinghua UniversityShenzhen 518055China

Wireless Power Transfer(WPT)charging systems can cause eddy loss on the steel part and the chassis of an Electric Vehicle(EV).To study different shielding structures’influence on the transmission efficiency of a WPT system,boundary conditions and assumptions of the WPT model in a quasistationary electromagnetic field were established and a finite element method(FEM)was *** shielding effectiveness of ferrite plate and annular aluminum plate were investigated as well as their effects on the coupling coefficient of *** was found that,the setting of ferrite core enhanced the transmission field strength,improved the coupling between two coils,and increased transmit power as well as the actual eddy *** actual necessary shielding-area was not confined into the samesize area but distributed around the edge of the *** arranging specialized size annular aluminum plates between the chassis and ferrite core,the eddy loss can be effectively shielded and an optimal transmission efficiency can breached with an acceptable coupling coefficient *** optimized ferrite bar structure and its EMC characteristics were also *** was also found that with equal volume,the optimized ferrite bar structure had better performance in EMC and coupling enhancement than the full ferrite plate.

关键词： Coupling co-efficiency eddy loss FEM magnetic shielding WPT

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：