检索结果-南通市图书馆

Hypoplastic constitutive modelling of the wetting induced creep of rockfill materials

Science China(Technological Sciences) 2012年第7期55卷 2066-2082页

作者： FU zhongzhi CHEN ShengShui LIU SiHong Geotechnical Engineering Department Nanjing Hydraulic Research InstituteNanjing 210024China Key Laboratory of Water Science and Engineering Ministry of Water ResourcesNanjing 210029China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China

Discrete element simulations of one-dimensional compression of breakable granular assemblies were performed to investigate the capability of the exponential compression equation suggested by *** relationship between the so-called solid hardness and the particle strength was studied so as to provide a physical background for the introduction of a time-dependent solid hardness.A hyperbolic flow rule,describing the relationship between the inclination of the strain path and the stress ratio during wetting,was proposed based on typical triaxial wetting experiments on two different rockfill *** flow rule was then extended and incorporated into the transformed stress based hypoplastic model to capture the direction of creep ***,a new density factor was introduced to the extended model to take into account the dependence of the magnitude of creep strains on the packing *** stiffness tensor given by the extended model was discussed and the flowchart for the integration of the constitutive equation was *** extended model was then embedded into a finite element program and used to simulate the triaxial compression and wetting experiments performed on the aforementioned rockfill *** agreement between the model predictions and the measured results lends sufficient credibility to the extended model in reproducing the stress-stain behaviour under loading and the creep behaviour during *** extended model and the finite element program were also used to investigate the deformation behaviour of an earth-rock dam at the end of construction and during first *** familiar phenomena such as the wetting induced settlement of the upstream shell and the movement of the dam crest towards the upstream were successfully captured by the numerical model,which confirms the feasibility of applying the extended model to dam engineering in the future.

关键词： rockfill materials wetting induced creep hypoplasticity constitutive model dam engineering

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

Molecular dynamics simulations of LiCl association and NaCl association in water by means of ABEEM/MM

引用

Science China Chemistry 2008年第12期51卷 1221-1230页

作者： LI Xin GONG LiDong YANG zhongzhi School of Chemistry and Chemical Engeering Liaoning Normal UniversityDalian 116029China

Constrained molecular dynamics simulations have been used to investigate the LiCl and NaCl ionic association in water in terms of atom-bond electronegativity equalization method fused into molecular mechanics (ABEEM/MM). The simulations make use of the seven-site fluctuating charge and flexible ABEEM-7P water model, based on which an ion-water interaction potential has been constructed. The mean force and the potential of mean force for LiCl and NaCl in water, the charge distributions, as well as the structural and dynamical properties of contact ion pair dissociation have been investigated. The results are reasonable and informative. For LiCl ion pair in water, the solvent-separated ion pair configurations are more stable than contact ion pair configurations. The calculated PMF for NaCl in water indicates that contact ion pair and solvent-separated ion pair configurations are of comparable stability.

关键词： atom-bond electronegativity equalization method fused into molecular mechanics (ABEEM/MM) molecular dynamics simulation ionic association

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

Accelerating the cryo-EM structure determination in RELION on GPU cluster

引用

Frontiers of Computer Science 2022年第3期16卷 21-39页

作者： Xin YOU Hailong YANG zhongzhi LUAN Depei QIAN Sino-German Joint Software Institute School of Computer Science and EngineeringBeihang UniversityBeijing 100191China State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi 214125

The cryo-electron microscopy(cryo-EM)is one of the most powerful technologies available today for structural *** RELION(Regularized Likelihood Optimization)implements a Bayesian algorithm for cryo-EM structure determination,which is one of the most widely used software in this *** researchers have devoted effort to improve the performance of RELION to satisfy the analysis for the ever-increasing volume of *** this paper,we focus on performance analysis of the most time-consuming computation steps in RELION and identify their performance bottlenecks for specific *** propose several performance optimization strategies to improve the overall performance of RELION,including optimization of expectation step,parallelization of maximization step,accelerating the computation of symmetries,and memory affinity *** experiment results show that our proposed optimizations achieve significant speedups of RELION across representative *** addition,we perform roofline model analysis to understand the effectiveness of our optimizations.

关键词： cryo-EM structure determination performance optimization GPU acceleration RELION

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

Food safety testing by negentropy-sorted kernel independent component analysis based on infrared spectroscopy

High-Confidence Computing

引用

High-Confidence Computing 2024年第3期4卷 25-31页

作者： Liu Jing Deng Limiao Han zhongzhi School of Science and Information Science Qingdao Agriculture UniversityQingdao 266109China

In the field of food safety testing,variety,brand,origin,and adulteration are four important *** this study,a novel food safety testing method based on infrared spectroscopy is proposed to investigate these *** transform infrared spectroscopy data are analyzed using negentropy-sorted kernel independent component analysis(NS-kICA)as the feature optimization *** rank the components,negentropy is performed to measure the non-Gaussian independent *** our experiment,the proposed method was run on four datasets to comprehensively investigate the variety,brand,origin,and adulteration of agricultural *** experimental results show that NS-kICA outperforms conventional feature selection *** support vector machine model outperforms the backpropagation artificial neural network and partial least squares *** combination of NS-kICA and support vector machine(SVM)is the best method for achieving high,stable,and efficient recognition *** findings are of great importance for food safety testing.

关键词： Food safety testing Infrared spectroscopy Independent component analysis Negentropy

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

Management strategies for allergic reaction following implantation of nickel-containing devices

引用

Journal of Interventional Medicine 2019年第3期2卷 139-140页

作者： zhongzhi Jia Department of Interventional Radiology The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical UniversityChangzhou213003China

Over the last thirty years,nickel-containing devices have been widely *** include inferior vena cava(IVC)filters,amplatzer occluders,vascular and non-vascular stents,and other endovascular and implantable *** to these nickel-containing devices has been well documented in the literature and has been reported to cause a major burden to the patients who have received nickelcontaining device ***,efforts for prevention,diagnosis,and management of hypersensitivity to nickel-containing devices are strongly encouraged.

关键词： Management strategies nickel-containing devices inferior vena cava

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

Adaptive associative classification with emerging frequent patterns

引用

High Technology Letters 2012年第1期18卷 38-44页

作者： Wang Xiaofeng Zhang Dapeng Shi zhongzhi The Key Laboratory of Intelligent Information Processing Institute of Computing TechnologyChinese Academy of SciencesBeijing 100190P.R.China Graduate University of Chinese Academy of Sciences Beijing 100049P.R.China Institute of Information Science and Engineering Yanshan UniversityQinhuangdao 066004P.R.China

In this paper, we propose an enhanced associative classification method by integrating the dynamic property in the process of associative classification. In the proposed method, we employ a support vector machine（SVM） based method to refine the discovered emerging ~equent patterns for classification rule extension for class label prediction. The empirical study shows that our method can be used to classify increasing resources efficiently and effectively.

关键词： associative classification rule frequent pattern mining emerging frequent pattern supportvector machine (SVM)

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

Tree-Indexed Markov Chains in Random Environment and Some of Their Strong Limit Properties

引用

Chinese Annals of Mathematics,Series B 2022年第4期43卷 621-642页

作者： Zhiyan SHI Bei WANG Weiguo YANG zhongzhi WANG School of Mathematical Sciences Jiangsu UniversityZhenjiang 212013JiangsuChina Faculty of Sciences Wuxi UniversityWuxi 214105JiangsuChina School of Mathematics&Physics Science and Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina

In this paper,the authors first introduce the tree-indexed Markov chains in random environment,which takes values on a general state ***,they prove the existence of this stochastic process,and develop a class of its equivalent *** on this property,some strong limit theorems including conditional entropy density are studied for the tree-indexed Markov chains in random environment.

关键词： Random environment Tree-indexed Markov chains Strong limit theorem Conditional entropy density

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

Improving multiprocessor performance with fine-grain coherence bypass

引用

Science China(Information Sciences) 2015年第1期58卷 84-98页

作者： WANG Hui WANG Rui LUAN zhongzhi QIAN XueHai QIAN DePei Sino-German Joint Software Institute School of Computer Science and EngineeringBeihang University University of Illinois Urbana-Champaign

Efficient and scalable cache coherence protocol is crucial to high-performance servers with sharedmemory. The directory-based cache coherence protocol is more desirable than the snooping-based protocol with respect to the scalability. However, even for the former protocol, scaling to a large number of cores is also challenging due to the additional area requirements of the directories. We observed that a significant percentage of the referenced memory blocks were only accessed by a single core(even in parallel applications) which could be considered as private memory blocks. An intuitive motivation from this observation is that memory blocks accessed by a single core do not require coherence maintenance. The issue is to identify the private block and track the change of its access pattern. We propose a novel hardware approach to(1) dynamically identify the shared memory blocks at the cache block level, and(2) bypass the coherence procedure for the private memory blocks. This approach increases the effectiveness of the directory-based approach and therefore improves the system performance. Experimental results showed that, our approach can on an average(1) avoid the coherence tracking of about 54% referenced memory blocks,(2) reduce the coherence overhead by 77%,(3) avoid 8% L2 cache misses, and(4) shorten the execution time of parallel applications by 13%.

关键词： many-core cache coherence private memory block fine-grain coherence high performance

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

青海省地方病防治机构实验室仪器设备档案的建立与管理

引用

医学动物防制 2019年第1期35卷 44-46页

作者：万惠赵忠智何建李胜柏吉祥贾慧霞祁芝珍魏柏青青海省地方病预防控制所

实验仪器设备档案逐渐成为实验室仪器设备管理的一个重要环节和组成部分,建立和完善实验室仪器设备档案管理对提高青海省地方病防治机构的地方病防治和科研水平具有举足轻重的作用。本文结合青海省地方病防治机构实验室仪器设备管理的... 详细信息

实验仪器设备档案逐渐成为实验室仪器设备管理的一个重要环节和组成部分,建立和完善实验室仪器设备档案管理对提高青海省地方病防治机构的地方病防治和科研水平具有举足轻重的作用。本文结合青海省地方病防治机构实验室仪器设备管理的实际工作情况,介绍了实验室仪器设备档案的建立、档案管理的基本内容,并提出了相应的管理措施。

关键词：实验室仪器设备档案管理

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

Coordinating workload balancing and power switching in renewable energy powered data center

引用

Frontiers of Computer Science 2016年第3期10卷 574-587页

作者： Xian LI Rui WANG zhongzhi LUAN Yi LIU Depei QIAN State Key Laboratory of Software Development Environment Beihang University Beijing 100191 China School of Computer Science and Engineering Beihang University Beijing 100191 China

There has been growing concern about energy consumption and environmental impact of datacenters. Some pioneers begin to power datacenters with renewable energy to offset carbon footprint. However, it is challenging to integrate intermittent renewable energy into datacenter power system. Grid-tied system is widely deployed in renewable energy powered datacenters. But the drawbacks （e.g. Harmonic dis- turbance and costliness） of grid tie inverter harass this design. Besides, the mixture of green load and brown load makes power management heavily depend on software measurement and monitoring, which often suffers inaccuracy. We propose DualPower, a novel power provisioning architecture that en- ables green datacenters to integrate renewable power supply without grid tie inverters. To optimize DualPower operation, we propose a specially designed power management frame- work to coordinate workload balancing with power supply switching. We evaluate three optimization schemes （LM, PS and JO） under different datacenter operation scenarios on our trace-driven simulation platform. The experimental results show that DualPower can be as efficient as grid-tied system and has good scalability. In contrast to previous works, Du- alPower integrates renewable power at lower cost and main- tains full availability of datacenter servers.

关键词： renewable energy green computing power pro-visioning power management

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

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：