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铺设方式对新型土工织物排水效率影响的试验研究

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铁道科学与工程学报 2024年第4期21卷 1470-1481页

作者：郭一鹏张雄聂如松林闯陈洁金张永杰长沙理工大学土木工程学院湖南长沙410114 高速铁路建造技术国家工程研究中心湖南长沙410075 密苏里科技大学密苏里罗拉65409 中南大学土木工程学院湖南长沙410075 哈尔滨工业大学交通科学与工程学院黑龙江哈尔滨150090

新型土工织物是一种排水效率较高的土工材料,相比传统土工织物,能将路基内的水分更高效率、更大程度地排出。目前关于这种新型土工织物的排水机理已有一定研究,但关于其铺设方式对排水效率的影响还缺乏系统研究。鉴于此,基于新型土工织... 详细信息

新型土工织物是一种排水效率较高的土工材料,相比传统土工织物,能将路基内的水分更高效率、更大程度地排出。目前关于这种新型土工织物的排水机理已有一定研究,但关于其铺设方式对排水效率的影响还缺乏系统研究。鉴于此,基于新型土工织物的编织结构、排水方式和墨水消散试验,通过在砂土中铺设一层土工织物,开展不同铺设方式下的排水对比试验,研究新型土工织物不同铺设方式对排水量、砂土湿润锋,砂土含水率(体积、质量)的影响规律。研究结果表明:新型土工织物水平+垂直向上铺设、新型土工织物水平+垂直向下铺设、传统土工织物水平+垂直向下铺设收集到的水量分别较砂土自由排水多12.23%、10.41%和5.97%;新型土工织物排水效率受铺设方式的影响,新型土工织物水平+垂直向上铺设排水效率最大;新型土工织物水平+垂直向上铺设时,不仅增加了排水路径,还扩大了排水影响范围,使砂土形成一定的湿度差,产生的吸力差能驱使水分迁移,加之新型土工织物的毛细作用,更多的水分被导出;砂土自由排水时,自由水沿孔隙排出,砂土中铺设传统土工织物,虽增加了排水路径,加速了排水效率,但其是憎水材料,在非饱和环境下排水效率低。研究成果可为新型土工织物处治路基病害的设计、施工提供参考。

关键词：新型土工织物铺设方式排水效率排水量湿润锋含水率

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Heisenberg群中带奇异权的最优临界Hardy-Trudinger-Moser不等式

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纯粹数学与应用数学 2024年第1期40卷 27-43页

作者：蔺闯胡云云窦井波陕西师范大学数学与统计学院陕西西安710119

本文建立了Heisenberg群中有界域和一般无界域上带奇异权的最优临界Hardy-Trudinger-Moser不等式.克服临界Hardy不等式和奇异权函数带来的困难,利用带奇异权的Trudinger-Moser不等式和一些基本估计建立了有界域上一般的带奇异权的临界Ha... 详细信息

本文建立了Heisenberg群中有界域和一般无界域上带奇异权的最优临界Hardy-Trudinger-Moser不等式.克服临界Hardy不等式和奇异权函数带来的困难,利用带奇异权的Trudinger-Moser不等式和一些基本估计建立了有界域上一般的带奇异权的临界Hardy-Trudinger-Moser不等式,并通过选取适当的Moser函数得到了最佳常数.最后,利用分割积分区域的方法得到了一般无界域上带奇异权的最优临界Hardy-Trudinger-Moser不等式.

关键词： Heisenberg群奇异权函数 Trudinger-Moser不等式 Hardy-Trudinger-Moser不等式最佳常数

芯吸土工织物-泥岩混合土路基排水效果模拟研究

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市政技术 2024年第8期42卷 72-77页

作者：苏兴茂高文禄孙显奎林闯哈尔滨工业大学交通科学与工程学院黑龙江哈尔滨150090 长春润德投资集团有限公司吉林长春130000 长春建业集团股份有限公司吉林长春130000

通过数值模拟定量研究了芯吸土工织物-泥岩混合土路基的排水效果,提出了具有最佳排水效果时的芯吸土工织物基质吸力和边坡植被吸力。研究结果表明:芯吸土工织物可以有效降低泥岩混合土路基体积含水率;随着芯吸土工织物基质吸力和边坡植... 详细信息

通过数值模拟定量研究了芯吸土工织物-泥岩混合土路基的排水效果,提出了具有最佳排水效果时的芯吸土工织物基质吸力和边坡植被吸力。研究结果表明:芯吸土工织物可以有效降低泥岩混合土路基体积含水率;随着芯吸土工织物基质吸力和边坡植被吸力的增加,路基排水效果逐渐增强。相关结论有助于指导泥岩地区基础工程的建设。

关键词：路基泥岩混合土芯吸土工织物排水效果

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型材箍带零件快速精准成形辅助弯曲模块设计

Performance analyses of two-phase closed thermosyphons for road embankments in the high-latitude permafrost regions

科学与信息化 2024年第5期 126-128,132页

作者：朱方媛张骞文林闯中航西安飞机工业集团股份有限公司陕西西安 710089

卡箍通常用在管线管路敷设位置提供刚性支撑,起到固定管线管路,调整布线结构的作用.本文针对2项卡箍箍带零件传统成形工艺存在的成形不稳定和精度不准确的问题,结合T型材箍带零件大角度折弯的外形特征,设计了一套专用辅助弯曲成形模块.... 详细信息

卡箍通常用在管线管路敷设位置提供刚性支撑,起到固定管线管路,调整布线结构的作用.本文针对2项卡箍箍带零件传统成形工艺存在的成形不稳定和精度不准确的问题,结合T型材箍带零件大角度折弯的外形特征,设计了一套专用辅助弯曲成形模块.改进后箍带零件的生产周期缩短了70%,一次交检合格率提升58.33%.本文设计思路具有通用性,可推广应用于同类小型弯曲件手工成形的工艺优化.

关键词：方形卡箍箍带手工弯曲弯曲模块

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Journal of Mountain Science 2023年第11期20卷 3138-3153页

作者： WANG Guan-fu lin chuang ZHU Long FENG De-cheng XIN Yang-yang ZHANG Feng School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China Sunpower Tech.Co. Ltd.Nanjing 211100China

Two-phase closed thermosyphons(TPCTs)are widely used in infrastructure constructions in permafrost *** to different climatic conditions,the effectiveness of TPCT will also be different,especially in the extremely cold region of the Da Xing'anling *** this study,a series of three-dimensional finite element TPCT embankment models were established based on the ZhanglingMohe highway TPCT test section in Da Xing'anling Mountains,and the thermal characteristics and the cooling effect of the TPCTs were *** results indicated that the TPCTs installed in the northeastern high-latitude regions is effective in cooling and stabilizing the *** working cycle of the TPCTs is nearly 7 months,and the cooling range of the TPCTs can reach 3 m in this ***,due to the extremely low temperature,the TPCT generates a large radial gradient in the permafrost ***,by changing the climate conditions,the same type of TPCT embankment located in the Da Xing'anling Mountains,the Xiao Xing'anling Mountains,and the Qinghai-Tibet Plateau permafrost regions were *** on the comparison of the climate differences between the Qinghai-Tibet Plateau and Northeast China,the differences in the effectiveness of TPCTs were ***,the limitations of using existing TPCTs in high-latitude permafrost regions of China were discussed and the potential improvements of the TPCT in cold regions were presented.

关键词： Permafrost Highway embankment Two-phase closed thermosyphon Numerical simulation Climatic condition Cooling performance

Investigation on the properties of compacted silty clay subjected to electro-osmosis using bender element

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Research in Cold and Arid Regions 2023年第6期15卷 253-261页

作者： KangWei Tang chuang lin Hao Wang WeiJun Qin DeCheng Feng Feng Zhang School of Transportation Science and Engineering Harbin Institute of Technology73 Huanghe RoadHarbinHeilongjiang 150090China Laboratoire Navier/CERMES Ecole des Ponts ParisTech6 et 8 Avenue Blaise PascalCite DescartesChamps-sur-Marne77455 Marne La Vallee Cedex 2France Key Laboratory of Transportation Industry for Highway Construction and Maintenance Technology in Seasonal Frozen Soil Areas(Changchun) 4887 Xinglong RoadChangchunJinlin 130102China

The moisture content of subgrade soil in seasonally frozen regions is often higher than its optimum value,leading to a decline in mechanical properties and a reduction in subgrade bearing ***-osmosis has shown promise as a technology for controlling subgrade moisture,but significant heterogeneity has also been observed in treated *** study investigates the impact of electro-osmosis on soil stiffness through a series of bender element tests of compacted *** effects of dry density and supply voltage on the performance of electroosmosis treatment and the layered structure and anisotropy of the soil were *** results show that electro-osmosis treatment increased the shear wave velocity of the soil by 140% compared to untreated saturated soil and by 70% compared to soil with optimum water *** has also been found that layered compaction of soil resulted in a layered structure,with electro-osmosis having a more prominent impact on soil near the cathode,resulting in a more pronounced layered ***,electro-osmosis was found to enhance soil anisotropy,particularly near the *** the dry density and voltage levels can help improve soil *** findings provide insights into the potential use of electro-osmosis in improving soil stiffness,which could benefit various engineering applications.

关键词： Subgrade soil Electro-osmosis Bender element Layered structure Anisotropy

Multi-objective evaluation and optimization on trustworthy computing

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Science China(Information Sciences) 2016年第10期59卷 242-244页

作者： chuang lin Chao XUE Department of Computer Science & Technology Tsinghua University

TC(trustworthy computing)is *** the appearance of TCB in TCSEC in the1980s and the following TDI and TNI,to the establishment of TCPA and the reorganization of TCG in April 2003,discussion and research on TC have lasted more than 30 years both in academia and *** are plenty of achievements and understanding in the exploration of software and networking trustworthiness,and they have been continuously developing and evolving with the appearance of new technology and environment.

关键词： MOP Multi-objective evaluation and optimization on trustworthy computing Figure

Energy Efficient Speed Scaling and Task Scheduling for Distributed Computing Systems

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Chinese Journal of Electronics 2015年第3期24卷 468-473页

作者： HUANG Jiwei lin chuang CHENG Bo State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Department of Computer Science and Technology Tsinghua University

With the rapid development of the performance of computer systems, energy consumption has been increasing dramatically as well. Energy efficiency has been paid much attention, especially in large-scale distributed computing systems. We propose an effective approach for energy reduction, by dynamic speed scaling and task scheduling simultaneously. Markov models for distributed computing systems are proposed, and detailed analyses of the models are provided. Markov decision processes(MDP) are applied for problem formulation, and MDP algorithms for obtaining the optimal solutions are introduced. The efficacy of our approach is further validated by simulation experiments.

关键词： Energy efficiency Speed scaling Task scheduling Markov decision process Distributed computing system

On applying stochastic network calculus

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Frontiers of Computer Science 2013年第6期7卷 924-942页

作者： chuang lin Yiping DENG Yuming JIANG Department of Computer Science and Technology Tsinghua University Beijing 100084 China China Electric Equipment and Systems Engineering Ltd. Beijing 100084 China Department of Telematics Norwegian University of Science and Technology Trondheim NO-7491 Norway

Performance evaluation plays a crucial role in the design of network systems. Many theoretical tools, including queueing theory, effective bandwidth and network calculus, have been proposed to provide modeling mechanisms and resuits. While these theories have been widely adopted for performance evaluation, each has its own limitation. With that network systems have become more complex and harder to describe, where a lot of uncertainty and randomness exists, to make performance evaluation of such systems tractable, some compromise is often necessary and helpful. Stochas- tic network calculus （SNC） is such a theoretical tool. While SNC is a relatively new theory, it is gaining increasing interest and popularity. In the current SNC literature, much attention has been paid on the development of the theory itself. In addition, researchers have also started applying SNC to performance analysis of various types of systems in recent years. The aim of this paper is to provide a tutorial on the new theoretical tool. Specifically, various SNC traffic models and SNC server models are reviewed. The focus is on how to apply SNC, for which, four critical steps are formalized and discussed. In addition, a list of SNC application topics/areas, where there may exist huge research potential, is presented.

关键词： stochastic network calculus bound performance arrival curve service curve