检索结果-南通市图书馆

DECOUPLED, ENERGY STABLE SCHEME FOR HYDRODYNAMIC ALLEN-CAHN PHASE FIELD MOVING CONTACT LINE MODEL

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2018年第5期36卷 661-681页

作者： rui chen Xiaofeng Yang Hui Zhang School of Science Beijing University of Posts and Telecommunications Beijing 100876 China Department of Mathematics University of South Carolina Columbia SC 29208 USA School of Mathematical Sciences Beijing Normal University Laboratory of Mathematics and Complex Systems Ministry of Education Beijing 100875 China

In this paper, we present an efficient energy stable scheme to solve a phase field model incorporating contact line condition. Instead of the usually used Cahn-Hilliard type phase equation, we adopt the Allen-Cahn type phase field model with the static contact line boundary condition that coupled with incompressible Navier-Stokes equations with Navier boundary condition. The projection method is used to deal with the Navier-Stokes equa- tions and an auxiliary function is introduced for the non-convex Ginzburg-Landau bulk potential. We show that the scheme is linear, decoupled and energy stable. Moreover, we prove that fully discrete scheme is also energy stable. An efficient finite element spatial discretization method is implemented to verify the accuracy and efficiency of proposed schemes. Numerical results show that the proposed scheme is very efficient and accurate.

关键词： Moving contact line Phase-field Navier-Stokes equations Allen-Cahn equation Finite element Energy stable scheme Linear element.

MICkNN:Multi-Instance Covering kNN Algorithm

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

Tsinghua Science and Technology 2013年第4期18卷 360-368页

作者： Shu Zhao chen rui Yanping Zhang Department of Computer Science and Technology and Key Lab of Intelligent Computing and Signal Processing Anhui University

Mining from ambiguous data is very important in data mining. This paper discusses one of the tasks for mining from ambiguous data known as multi-instance problem. In multi-instance problem, each pattern is a labeled bag that consists of a number of unlabeled instances. A bag is negative if all instances in it are negative. A bag is positive if it has at least one positive instance. Because the instances in the positive bag are not labeled, each positive bag is an ambiguous. The mining aim is to classify unseen bags. The main idea of existing multi-instance algorithms is to find true positive instances in positive bags and convert the multi-instance problem to the supervised problem, and get the labels of test bags according to predict the labels of unknown instances. In this paper, we aim at mining the multi-instance data from another point of view, i.e., excluding the false positive instances in positive bags and predicting the label of an entire unknown bag. We propose an algorithm called Multi-Instance Covering kNN （MICkNN） for mining from multi-instance data. Briefly, constructive covering algorithm is utilized to restructure the structure of the original multi-instance data at first. Then, the kNN algorithm is applied to discriminate the false positive instances. In the test stage, we label the tested bag directly according to the similarity between the unseen bag and sphere neighbors obtained from last two steps. Experimental results demonstrate the proposed algorithm is competitive with most of the state-of-the-art multi-instance methods both in classification accuracy and running time.

关键词： mining ambiguous data multi-instance classification constructive covering algorithm kNN algorithm

Opportunistic Vector Perturbation with Superposition Signalling

在线全文

学校读者我要写书评

暂无评论

China Communications 2015年第12期12卷 160-165页

作者： chen rui LI Changle LI Jiandong State Key Laboratory of Integrated Service Networks Xidian University

In this letter,we first put forward a new basic problem to the famous vector perturbation(VP) precoding that whether the extended constellation of VP could transmit more information ***,we propose an opportunistic vector perturbation(OVP) precoding with superposition signalling scheme,which is aimed at getting the performance of VP closer to capacity *** main idea is using subsequent recoverable data symbol vector to perturb currently transmitting data symbol vector *** and simulation results show that the proposed OVP can transmit more valid information bits than conventional VP at the same transmit power,modulation order and number of antennas.

关键词： transmit symbol opportunistic constellation perturbation subsequent closer downlink aimed antenna

禽白血病病毒p27蛋白单克隆抗体制备及抗原表位的鉴定

在线全文

学校读者我要写书评

暂无评论

动物医学进展 2025年第1期46卷 23-28页

作者：陈桂娥容芳苟鑫孙荣航李作生陈瑞爱岭南现代农业科学与技术广东省实验室肇庆分中心广东肇庆526238 华南农业大学生命科学学院广东广州510642 华南农业大学兽医学院广东广州510642 华农(肇庆)生物产业技术研究院有限公司广东肇庆526238 肇庆大华农生物药品有限公司广东肇庆526238

为制备禽白血病病毒(ALV)p27蛋白特异性单克隆抗体,利用原核表达系统表达并纯化ALV p27蛋白,将其作为免疫原免疫注射Balb/c小鼠,用杂交瘤细胞融合和ELISA等筛选出阳性单克隆抗体细胞,对制备的单克隆抗体的抗体亚型、效价及特异性进行鉴... 详细信息

为制备禽白血病病毒(ALV)p27蛋白特异性单克隆抗体,利用原核表达系统表达并纯化ALV p27蛋白,将其作为免疫原免疫注射Balb/c小鼠,用杂交瘤细胞融合和ELISA等筛选出阳性单克隆抗体细胞,对制备的单克隆抗体的抗体亚型、效价及特异性进行鉴定,将目的蛋白截短成4段,初步鉴定单克隆抗体识别的抗原表位区域。结果表明,共筛选出4株单克隆细胞,其抗体亚类皆为IgG1型,其中3A1抗体效价为1∶64000,3B2为1∶256000,5F1为1∶128000,5G2为1∶8000;4株单克隆抗体识别的抗原表位在1-60 aa之间。研究结果为进一步建立ALV相关免疫学检测方法提供了重要的材料。

关键词：禽白血病病毒 p27蛋白单克隆抗体抗原表位

Simulation of the Dendrite Morphology and Microsegregation in Solidification of Al–Cu–Mg Aluminum Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 173-181页

作者： rui chen Qing-Yan Xu Bai-cheng Liu Key Laboratory for Advanced Materials Processing Technology Ministry of Education School of Materials Science and Engineering Tsinghua University

Since most typical alloys in industrial applications are multicomponent with three or more components, and various CA models proposed in the past mainly focus on the binary alloys, a two-dimensional modified cellular automaton model allowing for the quantitatively predicting dendrite growth of multicomponent alloys in the low P6clet number regime is presented. The elimination of the mesh-induced anisotropy is achieved by adopting a modified virtual front tracking method. A new efficient method based on the lever rule is applied to calculate the solid fraction increment of the interfacial cells. The thermodynamic data such as liquidus temperature, the partition coefficients, and the slope of liquidus surface, needed for determining the dynamics of dendrite growth, are obtained by coupling with PanEngine. This model is applied to simulate the dendrite morphology and microsegregation of A1-Cu-Mg temary alloy both for single and multi- dendrites growth. The simulated results demonstrate that the difference of the concentration distribution profiles ahead of the dendrite tip for each alloying element mainly results from the different partition coefficients and solute diffusion coefficients. Comparison with the prediction of analytical model is carded out and it reveals the correctness of the model. Consequently, the difference in interdendritic microsegregation behavior of different components is analyzed.

关键词： Cellular automaton Multicomponent Dendrite growth Microsegregation

Functional tumor imaging based on inorganic nanomaterials

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2017年第11期60卷 1425-1438页

作者： Jiangfeng Du Xiao Zhang Liang Yan rui chen School of Radiation Medicine and Protection & School for Radiological and Interdisciplinary Sciences (RAD-X) Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions Soochow University CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics Chinese Academy of Sciences CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology of China College of Materials Sciences and Opto-Electronic Technology University of Chinese Academy of Sciences

Inorganic nanomaterials have attracted substantial research interest due to their unique intrinsic physicochemical properties. We highlighted recent advances in the applications of inorganic nanoparticles regarding their imaging efficacy, focusing on tumor-imaging nanomaterials such as metal-based and carbon-based nanomaterials and quantum dots. Inorganic nanoparticles gain excellent in vivo tumor-imaging functions based on their specific characteristics of strong near-infrared optical absorption and/or X-ray attenuation capability. The specific response signals from these novel nanornaterials can be captured using a series of imaging techniques, i.e., optical coherence tomography （OCT）, X-ray computed tomography （CT） imaging, two-photon luminescence （TPL）, photoacoustic tomography （PAT）, magnetic resonance imaging （MRI）, surface-enhanced Raman scattering （SERS） and positron emission tomography （PET）. In this review, we summarized the rapid development of inorganic nanomaterial applications using these analysis techniques and discussed the related safety issues of these materials.

关键词： imaging gold nanoparticles carbon nanotube graphene quantum dots toxicity

Ray-tracing simulations of whistler-mode wave propagation in different rescaled dipole magnetic fields

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2022年第6期6卷 555-562页

作者： YangGuang Ke QuanMing Lu XinLiang Gao HuaYue chen rui chen CAS Key Laboratory of Geoscience Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Hefei 230026China Collaborative Innovation Center of Astronautical Science and Technology Harbin 150001China

Kinetic simulation is a powerful tool to study the excitation and propagation of whistler-mode waves in the Earth’s inner *** method typically applies a scaled-down dipole magnetic field to save computational ***,it remains unknown whether whistler wave propagation in the scaled-down dipole field is consistent with that in the realistic dipole *** this work,we develop a ray-tracing code with a scalable dipole magnetic field to address this *** simulation results show that parallel whistler waves at different frequencies gradually become oblique after leaving the equator and propagate in different raypaths in a dipole magnetic *** their propagation,the higher frequency waves tend to have larger wave normal angles at the same *** with the wave propagation in a realistic dipole field,the wave raypath and wave normal remain the same,whereas the wave amplification or attenuation is smaller because of the shorter propagation time in a scaled-down dipole *** study provides significant guidance for kinetic simulations of whistler-mode waves.

关键词： whistler wave ray tracing propagation dipole magnetic field magnetosphere

全谷物及杂豆添加量在小鼠与人体间剂量换算分析

在线全文

学校读者我要写书评

暂无评论

食品科学 2025年第2期46卷 118-125页

作者：支莉朱益清赵亮星陈睿赵卿宇王超薛勇沈群国家粮食产业(青稞深加工)技术创新中心国家粮油标准测试研究中心中国农业大学食品科学与营养工程学院北京100083

适量摄入全谷物及杂豆可以改善糖代谢和脂代谢,但摄入量过高可能产生不利影响。由于缺乏相应的换算关系,小鼠饲料中的摄入量无法直接作为人群摄入量的参考。本文介绍小鼠饲料中常见的全谷物及杂豆的添加量,并通过等效系数法、比表面积... 详细信息

适量摄入全谷物及杂豆可以改善糖代谢和脂代谢,但摄入量过高可能产生不利影响。由于缺乏相应的换算关系,小鼠饲料中的摄入量无法直接作为人群摄入量的参考。本文介绍小鼠饲料中常见的全谷物及杂豆的添加量,并通过等效系数法、比表面积法、体型系数法、食物比重法、体表面积指数法、能量换算法和营养素换算法探讨了小鼠饲料中全谷物及杂豆添加量与人群膳食推荐量之间的剂量效应关系。研究表明,当人群全谷物及杂豆推荐摄入量为50~150 g时,相当于在每日进食量为3 g的小鼠饲料中添加5%~50%的全谷物及杂豆。对于小鼠而言,饲料中全谷物及杂豆的添加量超过50%可能存在过量摄入的风险。本研究为未来建立全谷物及杂豆在小鼠饲料添加量与人群推荐摄入量之间的换算关系提供了重要参考。

关键词：剂量换算全谷物杂豆体表面积

在线全文

学校读者我要写书评

暂无评论

考虑安全系数的汽车传动轴结构可靠性分析

汽车实用技术 2025年第1期50卷 56-59页

作者：胡全全陈睿肖俊豪陈前旭中车时代电动汽车股份有限公司货车研究院湖南株洲412000

合理地设计和选用汽车传动轴对保证整车动力系统可靠性非常重要。考虑安全系数的影响,建立传动轴应力极限状态的可靠性数模,将可靠性设计理论、一次二阶矩方法(FSOM)和Monte-Carlo仿真(MCS)数值模拟法相结合,计算了结构可靠度和可靠性... 详细信息

合理地设计和选用汽车传动轴对保证整车动力系统可靠性非常重要。考虑安全系数的影响,建立传动轴应力极限状态的可靠性数模,将可靠性设计理论、一次二阶矩方法(FSOM)和Monte-Carlo仿真(MCS)数值模拟法相结合,计算了结构可靠度和可靠性灵敏度。以某型汽车传动轴为算例,讨论汽车传动轴在安全系数影响下选用的可靠性,得到了汽车传动轴结构可靠性最大的影响因素,为汽车传动轴后续的结构选型及稳健优化设计提供了重要的参考价值。

关键词：汽车传动轴安全系数强度结构可靠度可靠性灵敏度

维普期刊数据库博看期刊