检索结果-南通市图书馆

RELAXED ASYNCHRONOUS ITERATIONS FOR THE LINEAR COMPLEMENTARITY PROBLEM

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2002年第1期20卷 97-112页

作者： Zhong-zhi bai yu-guang Huang LSEC ICMSECAcademy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China Oxford University Computing Laboratory Wolfson BuildingParks RoadOxford OX1 3QDU.K.

Presents a class of relaxed asynchronous parallel multisplitting iterative methods for solving the linear complementarity problem on multiprocessor systems. Establishment of the methods; Convergence theories; Numerica... 详细信息

关键词： linear complementarity problem matrix multisplitting relaxation method asynchronous iteration convergence theory

Dipole-moment-induced effect on contact electrification for triboelectric nanogenerators

在线全文

学校读者我要写书评

暂无评论

Nano Research 2014年第7期7卷 990-997页

作者： Peng bai Guang Zhu yu sheng Zhou Sihong Wang Jusheng Ma Gong Zhang Zhong Lin Wang School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332-0245 USA Department of Mechanical Engineering Tsinghua University Beijing 100084 China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing China

Triboelectric nanogenerators （TENGs） have been demonstrated as an effective way to harvest mechanical energy to drive small electronics. The density of triboelectric charges generated on contact surfaces between two distinct materials is a critical factor for dictating the output power. We demonstrate an approach to effectively tune the triboelectric properties of materials by taking advantage of the dipole moment in polarized polyvinylidene fluoride （PVDF）, leading to substantial enhancement of the output power density of the TENG. The output voltage ranged from 72 V to 215 V under a constant contact force of 50 N. This work not only provides a new method of enhancing output power of TENGs, but also offers an insight into charge transfer in contact electrification by investigating dipole-moment-induced effects on the electrical output of TENGs.

关键词： triboelectricnanogenerator modulation dipole moment

Netrin-1:the new tumor markers in renal clear cell carcinoma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2015年第6期8卷 488-492页

作者： bai-sheng Gong Qiang Feng Uropoiesis Surgical Department Sichuan Academy of Medical Sciences Sichuan Province People's Hospital

Objective:To explore the expression of Netrin-1 protein in human renal clear cell carcinoma(RCCC) and the relationships between *** and ***:72 cases of RCCC admitted in our hospital from 2008 June to 2009 June and their adjacent tissues were selected for *** included 30 cases in stage Ⅰ-Ⅱ.42 cases in stage Ⅲ-Ⅳ;9 cases in grade Ⅰ.9 cases in grade Ⅱ.40 cases in grade Ⅲ and 14 cases in grade Ⅳ.All cases were followed up for more than 5 *** analysis lines were made by Kaplan—Meier method and the difference between groups was tested by the Log-rank *** expression of Netrin-1 protein was detected by immunohistochemistry staining and its clinical significance was ***:Renal clear cell carcinoma:51 cases in high expression of Netrin-1and 21 cases in low expression,normal tissues:12 cases in high expression of Netrin-1and 60 cases in low expression,the difference between the two groups is significant(x^2=42.921,P<0.01).The difference of the expression of Netrin-lin Fuhrman grade and AJCC clinical stage is significant(x^2=8.000.x^2=6.203:P<0.05).The 5-year survival rate in low protein expression group and in high protein expression group was 79% (17/21) and 62% (32/51).The survival curve had different trend,with no significant difference between groups(x^2=1.360.P=0.245).Conclusions:Netrin-1 protein plays an important role in the development of *** might be a new specific tumor marker of *** might become a new target in treatment of RCCC.

关键词： Netrin-1 Renal clear cell carcinoma

The China Seismological Reference Model project

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2023年第5期7卷 521-532页

作者： LianXing Wen sheng yu Department of Geosciences State University of New York at Stony BrookStony BrookNY 11794USA Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Department of Earth Sciences National Natural Science Foundation of ChinaBeijing 100085China

The importance of developing high-resolution seismic models to improve understanding of tectonic processes and enhance seismic hazard mitigation programs,along with the rapid expansion of seismic coverage in China,called for a seismological reference model to be established in *** China Seismological Reference Model(CSRM)project was initiated by the National Natural Science Foundation of China with two primary goals:(1)the CSRM would serve as a primary source for the current state of seismological research in China,and(2)the seismic data and constraints used to construct the CSRM would be used as a backbone open-access cyberinfrastructure for future research in *** CSRM project was also intended to promote data exchange and scientific collaboration in seismology in ***,two parallel efforts of the project are being pursued:(1)construction of the CSRM,and(2)development of a CSRM product *** CSRM is jointly constrained by various types of seismic constraints extracted from the seismic data recorded at 4511 seismic stations in continental China following a top-down approach,with the seismic structures in the shallower part of the Earth constrained *** of the CSRM involves three preparation steps:(1)building datasets of various seismic constraints from the seismic data,(2)developing a method to incorporate the constraints of surface wave observations from regional earthquakes into the inversion of the seismic structure,and(3)constructing high-resolution pre-CSRM seismic models of the velocity structure in the shallow crust and the Pn-velocity structure in the uppermost *** the final process,the CSRM will be constructed by jointly inverting all the seismic constraints using the pre-CSRM models as starting models or a priori *** CSRM product center(http://***)archives and distributes three types of products:CSRM models,the Level 1 original seismic data used to extract seismic constraints

关键词： China Seismological Reference Model seismic structure seismic hazard tectonics continental China

On the Efficiency of a CFD-Based Full Convolution Neural Network for the Post-Processing of Field Data

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2021年第1期17卷 39-47页

作者： sheng bai Feng Bao Fengzhi Zhao School of Computer and Information Technology Northeast Petroleum UniversityDaqing163318China

The present study aims to improve the efficiency of typical procedures used for post-processing flow field data by applying a neural-network *** a problem of aircraft design as the workhorse,a regression calculation model for processing the flow data of a FCN-VGG19 aircraft is elaborated based on VGGNet(Visual Geometry Group Net)and FCN(Fully Convolutional Network)*** shown by the results,the model displays a strong fitting ability,and there is almost no over-fitting in ***,the model has good accuracy and *** different input data and different grids,the model basically achieves convergence,showing good *** is shown that the proposed simulation regression model based on FCN has great potential in typical problems of computational fluid dynamics(CFD)and related data processing.

关键词： CFD aircraft design FCN processing of flow field data regression calculation model

Understanding travel behavior adjustment under COVID-19

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Transportation Research 2022年第1期2卷 152-166页

作者： Wenbin Yao Jinqiang yu Ying Yang Nuo Chen sheng Jin Youwei Hu Congcong bai Institute of Intelligent Transportation Systems Zhejiang UniversityHangzhouChina Center for Balance Architecture Zhejiang UniversityHangzhouChina Alibaba Cloud Computing Co.Ltd. HangzhouChina School of Behavioural and Health Sciences Australian Catholic UniversitySydneyAustralia Pengcheng Laboratory ShenzhenChina

The outbreak and spreading of the COVID-19 pandemic have had a significant impact on transportation *** analyzing the impact of the pandemic on the transportation system,the impact of the pandemic on the social economy can be reflected to a certain extent,and the effect of anti-pandemic policy implementation can also be *** addition,the analysis results are expected to provide support for policy ***,most of the relevant studies analyze the impact of the pandemic on the overall transportation system from the macro perspective,while few studies quantitatively analyze the impact of the pandemic on individual spatiotemporal travel *** on the license plate recognition(LPR)data,this paper analyzes the spatiotemporal travel patterns of travelers in each stage of the pandemic progress,quantifies the change of travelers'spatiotemporal behaviors,and analyzes the adjustment of travelers'behaviors under the influence of the *** are three different behavior adjustment strategies under the influence of the pandemic,and the behavior adjustment is related to the individual's past travel *** paper quantitatively assesses the impact of the COVID-19 pandemic on individual travel *** the method proposed in this paper can be used to quantitatively assess the impact of any long-term emergency on individual micro travel behavior.

关键词： COVID-19 Travel pattern Travel behavior adjustment Prefix-span algorithm Random forest

Unanswered questions in unsaturated soil mechanics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2013年第5期56卷 1257-1272页

作者： sheng DaiChao ZHANG sheng yu ZhiWu School of Civil Engineering Central South University The University of Newcastle

The last two to three decades have seen significant advances in the mechanics of unsaturated *** is now widely recognized that the fundamental principles in soil mechanics must cover both saturated and unsaturated ***,there is still a great deal of uncertainties in the geotechnical community about how soil mechanics principles well-established for saturated soils can be extended to unsaturated *** is even wide skepticism about the necessity of such extension in engineering *** paper discusses some common pitfalls related to the fundamental principles that govern the volume change,shear strength and hydromechanical behaviour of unsaturated *** also attempts to address the issue of engineering relevance of unsaturated soil mechanics.

关键词： unsaturated soils constitutive modeling volume change shear strength engineering applications

Synthesis of High Molecular Weight Polyethylene and E-MA Copolymers Using Iminopyridine Ni(Ⅱ) and Pd(Ⅱ) Complexes Containing a Flexible Backbone and Rigid Axial Substituents

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第2期41卷 233-239页

作者： yu-Dan Liao Qi Cai sheng-yu Dai School of Chemical and Environmental Engineering Anhui Polytechnic UniversityWuhu241000China Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationAnhui UniversityHefei230601China

Suppressing the chain transfer reactions during polymerization in late-transition metal-catalyzed olefin polymerization systems is the key to obtaining high molecular weight polyolefin materials. In this work, two efficient strategies(“sandwich” and rotation-restricted strategies)to retard chain transfer reactions in ethylene(co)polymerization were employed for the iminopyridyl system. Herein, a family of iminopyridyl Ni(Ⅱ)and Pd(Ⅱ) complexes with a flexible backbone and rigid axial bulky aryl substituents were designed, synthesized and characterized. In ethylene polymerization, the iminopyridyl Ni(Ⅱ) and Pd(Ⅱ) catalysts using the two strategies exhibited reasonable activities and generated highly branched polyethylenes with high molecular weights, where catalysts with dibenzosuberyl substituents exhibited significantly higher activities and produced higher molecular weight polyethylene than catalysts with 8-arylnaphthalenyl substituent. A similar trend of activities and molecular weights was also found in the copolymerization of ethylene with MA using the Pd(Ⅱ) catalysts. Moreover, highly branched E-MA copolymers with moderate to high molecular weights and high incorporation ratios(up to 17.4 mol%) were generated with the two Pd(Ⅱ) catalysts. Most interestingly, as compared with the dibenzhydryl Ni(Ⅱ) and Pd(Ⅱ) catalysts, the catalysts using the two strategies exhibited a superior ability to retard the chain transfer reactions and generated polymers and copolymers with 1-2 orders of magnitude higher molecular weights during ethylene(co)polymerization.

关键词： Ni(Ⅱ)and Pd(Ⅱ) Suppressing chain transfer High molecular weight Ethylene(co)polymerization

Global Stability of a Mumps Transmission Model with Quarantine Measure

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2021年第4期37卷 665-672页

作者： yu-zhen bai Xiao-jing WANG Song-bai GUO School of Science Beijing University of Civil Engineering and ArchitectureBeijing102616China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing100190China

In this paper,a model of mumps transmission with quarantine measure is proposed and then the control reproduction number Rc of the model is *** model admits a unique endemic equilibrium P*if and only if Rc>1,while the disease-free equilibrium P0 always *** using the technique of constructing Lyapunov functions and the generalized Lyapunov-LaSalle theorem,we first show that the equilibrium P0 is globally asymptotically stable(GAS)if Rc≤1;second,we prove that the equilibrium P*is GAS if Rc>*** results reveal that mumps can be eliminated from the community for Rc≤1 and it will be persistent for Rc>1,and quarantine measure can also effectively control the mumps transmission.

关键词： mumps transmission model control reproduction number quarantine measure global stability