检索结果-南通市图书馆

A New High-Efficiency Experimental Design for Optimizing Various Flow Velocities Testing in Extremely Aggressive Formation Water

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第8期32卷 944-950页

作者： Yang Zhao Shu-Yun Cao Tao Zhang jun-feng xie Da-Ke Xu Fu-Hui Wang Shenyang National Laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819China State Key Laboratory of Separation Membranes and Membrane Processes School of Material Science and EngineeringTianjin Polytechnic UniversityTianjin 300387China Petrochina Tarim Oilfield Company Shihua RoadKorla 841000China

Compared to the traditional one-by-one method,a new high-efficiency method is used to characterize large numbers of regulations varying ***,bump-shaped electrodes are designed using the computational fluid dynamics model,and the effect of the height and placement of these electrodes is *** experimental feasibility is certified by weight loss *** indicate that flow velocities of different bump-shaped electrode surfaces are significant ***,each surface can be analyzed independently;the thickness loss of each electrode surface is consistent with that using one-by-one method,which can effectively improve the experimental efficiency 12 times.

关键词： Bump-shaped electrodes High efficiency Computational fluid dynamics(CFD) Weight loss

Corrosion Performance of High Strength 15Cr Martensitic Stainless Steel in Severe Environments

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2014年第8期21卷 774-780页

作者： Xiang-hong L Fu-xiang ZHANG Xiang-tong YANG jun-feng xie Guo-xian ZHAO Yan XUE School of Materials Science and Engineering Xi'an Shiyou University Petroleum Engineering Institute Petrochina Tarim Oilfield Company Xi'an Maurer Petroleum Engineering Laboratory Co.Ltd.

High pressure and high temperature corrosion performance of high strength 15 Cr martensitic stainless steel was studied in different severe environments—live acid（10%HCl＋1.5%HF＋3%HAc＋5.1% corrosion inhibitor）,spent acid and formation water containing *** results show that the corrosion of high strength 15 Cr martensitic stainless steel in live acid is most serious,and the uniform corrosion rate is far greater than those in spent acid and formation water containing CO2 corrosion environments,but all of them can be acceptable for *** corrosion inhibitor displays a good matching ability with the high strength 15 Cr martensitic stainless steel in terms of decreasing the uniform corrosion rate,which changes mainly the anodic process of high strength 15 Cr martensitic stainless *** corrosion potential moves to the positive direction,thus the corrosion current density decreases *** are some different degrees of pitting of high strength 15 Cr martensitic stainless steel after corrosion tests in live acid,spent acid and formation water containing CO2,and the pitting density aggravates significantly and the maximum pit depth decreases in the corrosion sequence.

关键词： high strength 15Cr martensitic stainless steel live acid spent acid CO2 corrosion

Caching resource sharing in radio access networks： a game theoretic approach

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2016年第12期17卷 1253-1265页

作者： jun-feng xie Ren-chao xie Tao HUANG Jiang LIU F. Richard YU Yun-jie LIU State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Advanced Innovation Center for Future Internet Technology Beijing University of Technology Beijing 100124 China Department of Systems and Computer Engineering Carleton University Ottawa ON KIS 5B6 Canada

Deployment of caching in wireless networks has been considered an effective method to cope with the challenge brought on by the explosive wireless traffic. Although some research has been conducted on caching in cellular networks, most of the previous works have focused on performance optimization for content caching. To the best of our knowledge, the problem of caching resource sharing for multiple service provider servers （SPSs） has been largely ignored. In this paper, by assuming that the caching capability is deployed in the base station of a radio access network, we consider the problem of caching resource sharing for multiple SPSs competing for the caching space. We formulate this problem as an oligopoly market model and use a dynamic non-cooperative game to obtain the optimal amount of caching space needed by the SPSs. In the dynamic game, the SPSs gradually and iteratively adjust their strategies based on their previous strategies and the information given by the base station. Then through rigorous mathematical analysis, the Nash equilibrium and stability condition of the dynamic game are proven. Finally, simulation results are presented to show the performance of the proposed dynamic caching resource allocation scheme.

关键词： Video caching Oligopoly market Game theory Nash equilibrium Stability analysis

Observation of topological charge transformations in acoustic vortex using passive periodic systems

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 140-147页

作者： Di-Chao Chen xie Liu Changqing Xu Da-Jian Wu Ying Cheng Xiao-jun Liu School of Physics and Technology Nanjing Normal University Key Laboratory of Modern Acoustics School of Physics Nanjing University

Vortex transmutation utilizes a periodic system, which not only enables the alteration of the topological charge(TC) of unstable input vortices but also facilitates their transformation into stable structures. This approach is crucial for investigating the characteristics of vortices in various wave systems. Here, we achieve acoustic vortex TC transmutation by employing a welldesigned dual-structured plate external system(DPES). The interactions between the acoustic vortex and the finite-order discrete rotational symmetry lead to the transformation of its topological charge when complete rotational symmetry is broken to Nthorder discrete symmetry. Our results experimentally demonstrate the acoustic vortex TC transmutation based on passive artificial structures, enabling numerous applications in particle manipulation and information multiplexing as well as advancing our understanding and control over free-space acoustic vortices.

关键词： acoustic vortex topological charge transformation artificial structure

经椎旁肌间隙入路椎弓根螺钉固定结合硫酸钙治疗单一椎体胸腰椎骨折

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国组织工程研究 2017年第19期21卷 2986-2992页

作者：占方彪王诗军程军冯世龙谢鲤钟李波张友重庆三峡中心医院骨科重庆市404000 北京大学第一医院骨科北京市100034

背景:胸腰椎骨折是脊柱最常见的骨折类型,传统的后正中入路对椎旁肌的广泛剥离与牵拉,椎旁肌缺血和失神经支配,导致术后腰背肌萎缩,并产生顽固性的腰背痛。而微创手术治疗越来越被广大的骨科医生所接受。目的:探讨经椎旁肌间隙椎弓根螺... 详细信息

背景:胸腰椎骨折是脊柱最常见的骨折类型,传统的后正中入路对椎旁肌的广泛剥离与牵拉,椎旁肌缺血和失神经支配,导致术后腰背肌萎缩,并产生顽固性的腰背痛。而微创手术治疗越来越被广大的骨科医生所接受。目的:探讨经椎旁肌间隙椎弓根螺钉内固定结合可注射硫酸钙骨水泥治疗单一椎体胸腰椎骨折的临床疗效。方法:回顾性分析获得完整随访资料的52例单一椎体胸腰椎骨折不伴有神经损伤患者,根据手术入路分为2组。观察组28例,采用后路经椎旁肌间隙入路短节段椎弓根螺钉固定结合伤椎硫酸钙植入;对照组24例,采用传统后正中入路短节段椎弓根螺钉固定结合伤椎硫酸钙植入。比较2组患者的手术时间、手术出血量、住院时间:观察2组患者术前及术后1周、3个月时腰背部疼痛情况;观察2组患者术前、术后下地前和末次随访时X射线片上伤椎前缘高度百分比;记录2组患者手术并发症及内固定松动、断裂情况。结果与结论:(1)52例患者均获得随访,随访时间16-24个月;(2)观察组手术时间、手术出血量及住院时间均少于对照组,差异均有显著性意义(P0.05);(5)结果提示,在严格掌握手术适应证的前提下,经椎旁肌间隙入路椎弓根螺钉固定结合硫酸钙治疗单一椎体胸腰椎骨折安全可靠,可即刻恢复伤椎前缘高度,减轻疼痛,远期疗效满意。和传统后正中入路手术相比,手术时间更短,术中出血量更少。

关键词：胸椎腰椎硫酸钙骨折愈合组织工程骨科植入物脊柱植入物胸腰椎骨折椎弓根钉椎旁肌微创

吡咯列酮对重症急性胰腺炎大鼠肺组织中ICAM-1表达的影响

在线全文

学校读者我要写书评

暂无评论

世界华人消化杂志 2009年第7期17卷 667-671页

作者：谢俊锋刘志坚白爱平姜景平范海青陈江谢勇徐萍南昌大学第一附属医院消化内科江西省南昌市330006 上海交通大学附属第一人民医院松江分院消化科上海市201600

目的:探讨PPARγ激动剂吡咯列酮对重症急性胰腺炎大鼠肺组织ICAM-1表达的影响及其意义.方法:将54只健康雄性SD大鼠随机分为假手术组(A组)、SAP组(B组)、吡格列酮治疗组(C组),n=18,制作SAP模型,通过免疫组织化学方法动态观察3组大鼠肺组... 详细信息

目的:探讨PPARγ激动剂吡咯列酮对重症急性胰腺炎大鼠肺组织ICAM-1表达的影响及其意义.方法:将54只健康雄性SD大鼠随机分为假手术组(A组)、SAP组(B组)、吡格列酮治疗组(C组),n=18,制作SAP模型,通过免疫组织化学方法动态观察3组大鼠肺组织中ICAM-1的表达,同时观察肺组织病理及髓过氧化物酶(MPO)的改变.结果:A组大鼠肺组织出现明显的充血水肿和中性粒细胞增多,而T组肺部炎症反应明显减轻.T组肺组织MPO明显低于A组(6h:5.12±0.71vs6.03±0.63,P<0.05;12h:5.20±0.66vs8.05±0.62,P<0.01).从造模3h起,A组大鼠肺部ICAM-1即持续上调,呈时间依赖性,3,6,12h表达分别为0.82±0.23,1.03±0.31,1.40±0.58,12h与3h比较差异有统计学意义(P<0.05);T组ICAM-1在3,6,12h表达分别为0.62±0.18,0.75±0.27,0.78±0.31,12h明显低于A组(P<0.05);C组呈弱阳性表达,并随时间推移而消失.结论:SAP合并肺损伤时,肺组织中ICAM-1过度表达,中性粒细胞大量浸润,吡格列酮对其的表达有抑制作用.

关键词：重症急性胰腺炎肺损伤吡格列酮细胞间黏附分子-l

Hypoxia-preconditioned bone marrow-derived mesenchymal stem cells protect neurons from cardiac arrest-induced pyroptosis

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

Neural Regeneration Research 2025年第4期20卷 1103-1123页

作者： Xiahong Tang Nan Zheng Qingming Lin Yan You Zheng Gong Yangping Zhuang Jiali Wu Yu Wang Hanlin Huang jun Ke feng Chen Shengli Clinical Medical College of Fujian Medical University Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Emergency Fujian Provincial HospitalFuzhouFujian ProvinceChina Fujian Provincial Key Laboratory of Emergency Medicine FuzhouFujian ProvinceChina The Second Department of Intensive Care Unit Fujian Provincial Hospital South BranchFuzhouFujian ProvinceChina

Cardiac arrest can lead to severe neurological impairment as a result of inflammation,mitochondrial dysfunction,and post-cardiopulmonary resuscitation neurological *** preconditioning has been shown to improve migration and survival of bone marrow–derived mesenchymal stem cells and reduce pyroptosis after cardiac arrest,but the specific mechanisms by which hypoxia-preconditioned bone marrow–derived mesenchymal stem cells protect against brain injury after cardiac arrest are *** this end,we established an in vitro co-culture model of bone marrow–derived mesenchymal stem cells and oxygen–glucose deprived primary neurons and found that hypoxic preconditioning enhanced the protective effect of bone marrow stromal stem cells against neuronal pyroptosis,possibly through inhibition of the MAPK and nuclear factor κB ***,we transplanted hypoxia-preconditioned bone marrow–derived mesenchymal stem cells into the lateral ventricle after the return of spontaneous circulation in an 8-minute cardiac arrest rat model induced by *** results showed that hypoxia-preconditioned bone marrow–derived mesenchymal stem cells significantly reduced cardiac arrest–induced neuronal pyroptosis,oxidative stress,and mitochondrial damage,whereas knockdown of the liver isoform of phosphofructokinase in bone marrow–derived mesenchymal stem cells inhibited these *** conclude,hypoxia-preconditioned bone marrow–derived mesenchymal stem cells offer a promising therapeutic approach for neuronal injury following cardiac arrest,and their beneficial effects are potentially associated with increased expression of the liver isoform of phosphofructokinase following hypoxic preconditioning.

关键词： bone marrow–derived mesenchymal stem cells cardiac arrest cardiac resuscitation hypoxic preconditioning liver isoform of phosphofructokinase mitochondria neuroinflammation oxidative stress pyroptosis reactive oxygen species

在线全文

学校读者我要写书评

暂无评论

高挥发分烟煤的热解、燃烧特性研究

燃料化学学报 2002年第1期30卷 41-44页

作者：刘生玉田亚峻尤先峰谢克昌国家C1化学化工重点实验室山西省煤科学重点实验室太原理工大学矿业工程学院山西太原030024

采用固定床热解反应器、热解红外联用仪 (Py FTIR)和热重分析仪 ,考察了高挥发分烟煤的热解、燃烧特性 ,实验结果表明 ,高挥发分烟煤在热解过程中放出大量烃类气体 ,从燃烧试验看 ,明显分为热解段和燃烧段 ,且热解段挥发分的释放非常... 详细信息

采用固定床热解反应器、热解红外联用仪 (Py FTIR)和热重分析仪 ,考察了高挥发分烟煤的热解、燃烧特性 ,实验结果表明 ,高挥发分烟煤在热解过程中放出大量烃类气体 ,从燃烧试验看 ,明显分为热解段和燃烧段 ,且热解段挥发分的释放非常迅速 ,从而揭示出高挥发分烟煤燃烧过程中产生大量黑烟的原因。

关键词：高挥发分烟煤热解燃烧热重分析固定床热解反应器

A Deep Model for Partial Multi-label Image Classification with Curriculum-based Disambiguation

在线全文

学校读者我要写书评

暂无评论

Machine Intelligence Research 2024年第4期21卷 801-814页

作者： feng Sun Ming-Kun xie Sheng-jun Huang MIIT Key Laboratory of Pattern Analysis and Machine Intelligence College of Computer Science and TechnologyNanjing University of AeronauticsandAstronauticsNanjing211106China

In this paper,we study the partial multi-label(PML)image classification problem,where each image is annotated with a candidate label set consisting of multiple relevant labels and other noisy *** PML methods typically design a disambiguation strategy to filter out noisy labels by utilizing prior knowledge with extra assumptions,which unfortunately is unavailable in many real ***,because the objective function for disambiguation is usually elaborately designed on the whole training set,it can hardly be optimized in a deep model with stochastic gradient descent(SGD)on *** this paper,for the first time,we propose a deep model for PML to enhance the representation and discrimination *** the one hand,we propose a novel curriculum-based disambiguation strategy to progressively identify ground-truth labels by incorporating the varied difficulties of different *** the other hand,consistency regularization is introduced for model training to balance fitting identified easy labels and exploiting potential relevant *** experimental results on the commonly used benchmark datasets show that the proposed method significantlyoutperforms the SOTA methods.

关键词： Partial multi-label image classification curriculum-based disambiguation consistency regularization label difficulty candidatelabel set.