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Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

《结构与土木工程前沿（英文）》 2023年第17卷第4期页码 546-565 doi: 10.1007/s11709-023-0943-4

摘要： Scouring is one of the primary triggers of failure for bridges across rivers or seas. However, research concerning the scour mechanism of multi-wall foundations (MWFs) remains scarce, hindering the further application of MWFs. In this study, for the first time, the scouring effect caused by unidirectional flow around MWFs was examined numerically using FLOW-3D involving a large-eddy simulation. Initially, the applicability of the scouring model and input parameters was validated using a case study based on published measured data. Subsequently, the scouring effects of four MWFs with different wall arrangements and inflow angles, including the flow field analysis and scour pit and depth, were investigated thoroughly. It was found that the maximum scour depth of MWFs with an inflow angle of 0° was smaller than that of those with an inflow angle of 45°, regardless of the wall arrangement. Meanwhile, changing the inflow angle significantly affects the scour characteristics of MWFs arranged in parallel. In practical engineering, MWFs arranged in parallel are preferred considering the need for scouring resistance. However, a comparative analysis should be performed to consider comprehensively whether to adopt the form of a round wall arrangement when the inflow angle is not 0° or the inflow direction is changeable.

关键词： multi-wall foundation current-induced scour bridge foundation large-eddy simulation numerical analysis

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Eddy current measurement of the thickness of top Cu film of the multilayer interconnects in the integrated

Zilian QU,Yonggang MENG,Qian ZHAO

《机械工程前沿（英文）》 2015年第10卷第1期页码 1-6 doi: 10.1007/s11465-015-0325-2

摘要：

This paper proposes a new eddy current method, named equivalent unit method (EUM), for the thickness measurement of the top copper film of multilayer interconnects in the chemical mechanical polishing (CMP) process, which is an important step in the integrated circuit (IC) manufacturing. The influence of the underneath circuit layers on the eddy current is modeled and treated as an equivalent film thickness. By subtracting this equivalent film component, the accuracy of the thickness measurement of the top copper layer with an eddy current sensor is improved and the absolute error is 3 nm for sampler measurement.

关键词： CMP eddy current multilayer wafer Cu interconnects equivalent unit

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A dynamic procedure based on the scale-similarity hypotheses for large-eddy simulation

ZHOU Bing, CUI Guixiang, CHEN Naixiang

《能源前沿（英文）》 2007年第1卷第4期页码 468-472 doi: 10.1007/s11708-007-0069-z

摘要： Current dynamic procedures in large-eddy simulation treat the two subgrid-scale stresses in the Germano identity with the same subgrid base model. Thus to get the base model coefficient, the coefficient must be assumed to be consta

关键词： large-eddy simulation Germano identity coefficient subgrid-scale

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Large eddy simulation of turbulent buffet forces in flow induced vibration

XI Zhide, CHENG Bingde, LI Pengzhou

《能源前沿（英文）》 2008年第2卷第4期页码 524-527 doi: 10.1007/s11708-008-0099-x

摘要： The pressure pulse filter and Smagorinsky sub-grid stress model of the Large Eddy Simulation (LES) are introduced. The fluid field in the annular plenum between the pressure vessel and the core barrel of the1:5 model in the second phase of Qinshan Nuclear Power Plant is simulated, and the distribution of the total pressure in the space and time domains is obtained. The results show that the Power Spectrum Density (PSD) of LES from the calculation and the test are in the same quantity order. Thus, the pressure of LES can be a load to stimulate the barrel vibration.

关键词： Spectrum Density Smagorinsky sub-grid vibration calculation Qinshan Nuclear

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Large eddy simulation of a 660 MW utility boiler under variable load conditions

Haoshu SHEN, Yuxin WU, Minmin ZHOU, Hai ZHANG, Guangxi YUE, Junfu LYU

《能源前沿（英文）》 2021年第15卷第1期页码 124-131 doi: 10.1007/s11708-020-0659-2

摘要： Large eddy simulation (LES) has become a promising tool for pulverized coal combustion with the development of computational fluid dynamics (CFD) technologies in recent years. LES can better capture the unsteady features and turbulent structures of coal jet flame than Reynolds averaged Navier Stokes (RANS). The coal-fired power plants in China are now required to be operated in a wide load range and quickly respond to the electric grid. The boiler performance of variable loads should be evaluated in terms of flow, heat transfer, and combustion processes. In this paper, LES was applied to simulate a 660 MW ultra-supercritical boiler under BMCR (boiler maximum continue rate), 75%THA-100, and 50%THA-100 conditions. The predicted gas velocities agree well with the thermal calculation and the temperature error is less than 130 K. The simulation results show that the operation load has significant effects on the boiler performance. It is also proved that LES can provide guidance for the design and operation of advanced coal-fired boilers.

关键词： large eddy simulation ultra-supercritical boiler operation load

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基于分形图案蚀刻屏蔽金属提高磁耦合能量传输效率

Qing-feng LI,Shao-bo CHEN,Wei-ming WANG,Hong-wei HAO,Lu-ming LI

《信息与电子工程前沿（英文）》 2016年第17卷第1期页码 74-82 doi: 10.1631/FITEE.1500114

摘要：薄金属板通常位于磁耦合能量传输（MCET）系统的耦合路径中。金属中的涡流会降低能量传输效率，甚至可能带来安全隐患。本文介绍了在金属中使用蚀刻的分形图案来抑制涡流并提高效率。仿真和实验结果表明该方法非常有效。分形图案应满足三个特征，即，破坏金属边缘，在高强度磁场区域中进行蚀刻以及在厚度方向上贯穿金属进行蚀刻。不同的分形模式导致不同的结果。通过改变涡流分布，当金属表现出电阻效应时，分形图案槽可减少涡流损耗，而当金属表现出电感效应时，分形图案槽可抑制金属中的感应磁场。多层高电导率金属（例如Cu）中的分形图案缝隙显着降低了感应磁场强度。此外，随着蚀刻层数的增加，传递功率，传递效率，接收效率和涡流损耗都增加。这些结果可通过有效的能量传输和在金属屏蔽设备中的安全使用而使MCET受益。

关键词：分形几何；层状金属屏蔽；涡流效应；磁耦合能量传输

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瞬变电磁法用于检测与识别硐室爆破盲炮的可行性探讨

刘连生,梁龙华,吴吉洋,焦永斌,陆哲祥

《中国工程科学》 2014年第16卷第11期页码 107-112

摘要：

应用瞬变电磁法对硐室爆破盲炮的检测与识别进行了可行性研究。试验时先确立电磁背景场，然后在硐室中预置良性导体并测得电磁场后消除背景场，在爆破后再次进行瞬变电磁测量。通过对比爆破前后预置良性导体涡流场的变化，实现硐室爆破盲炮检测与识别的目的。试验结果表明，当铝箱目标体埋深不超过30 m时，瞬变电磁检测法可以明确地确定铝箱的位置；当铝箱埋深超过30 m后，铝箱形成的二次涡流场层次不明，不能确定铝箱的埋深与位置。

关键词：瞬变电磁法硐室爆破盲炮检测与识别涡流场目标体

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Effect of current density on groundwater arsenite removal performance using air cathode electrocoagulation

《环境科学与工程前沿（英文）》 2021年第15卷第6期 doi: 10.1007/s11783-021-1399-1

摘要：

• With the same charge, current density had little effect on As(III) removal in ACEC.

关键词： Electrocoagulation Air cathode Arsenic Current density Energy consumption

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EGG PRODUCTION IN CHINA: CURRENT STATUS AND OUTLOOK

Ning YANG

《农业科学与工程前沿（英文）》 2021年第8卷第1期页码 25-34 doi: 10.15302/J-FASE-2020363

摘要： Eggs are one of the most nutritious and affordable animal products worldwide. From 1985, egg production in China has retained the leading place in the world. A total of 33 Mt of eggs were produced in 2019 representing ˃ 40% of the world total production. Egg production in China is characterized by diversity in several aspects, including layer breeds, products and production systems. New breeds and synthetic lines are developed to improve the genetic potentials of egg production and feed efficiency of layers. In the past, layer farms were run mostly by small households with 100 to 1000 layers per farm. Over the past decades, egg production in China has developed toward standardization and expansion of production systems, and many of these modern intensive farms raise millions of layers. Although the Chinese egg products maintain strong competitiveness over other animal products and imported egg products, the egg industry will grow at a slower pace compared to the past. Chinese consumers are more concerned about the quality and safety of eggs and egg products, as well as the environmental issues related to animal production, which presents challenges for the Chinese egg industry.

关键词： poultry farms China diversity egg production trends

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基于迭代算法的有源电力滤波器谐波电流实时检测新方法

李自成,孙玉坤

《中国工程科学》 2006年第8卷第1期页码 46-50

摘要：

目前，已经提出了多种有源电力滤波器谐波及无功电流检测方法，尽管这些方法各有特点，但都存在着难以克服的问题，如计算量大，实时性差，检测精度不高等。文章在负载电流分析的基础上，提出了一种基于迭代算法的有源电力滤波器谐波电流实时检测方法，该方法具有计算量非常小，实时性好，检测精度高等特点。理论分析与仿真研究证实了该方法的正确性。

关键词：有源电力滤波器谐波电流有功电流无功电流

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EGG PRODUCTION IN CHINA: CURRENT STATUS AND OUTLOOK

《农业科学与工程前沿（英文）》 2021年第8卷第1期页码 25-34

摘要：

• China is now the largest egg production country worldwide

• Egg production in China is characterized by diversity in several aspects

• China is now capable of breeding new varieties, with more than 50% of the market share

• Policies have been implemented to ensure sustainable development of egg production

• Integrating crop-chicken-vegetable production system is established

Eggs are one of the most nutritious and affordable animal products worldwide. From 1985, egg production in China has retained the leading place in the world. A total of 33 Mt of eggs were produced in 2019 representing ˃ 40% of the world total production. Egg production in China is characterized by diversity in several aspects, including layer breeds, products and production systems. New breeds and synthetic lines are developed to improve the genetic potentials of egg production and feed efficiency of layers. In the past, layer farms were run mostly by small households with 100 to 1000 layers per farm. Over the past decades, egg production in China has developed toward standardization and expansion of production systems, and many of these modern intensive farms raise millions of layers. Although the Chinese egg products maintain strong competitiveness over other animal products and imported egg products, the egg industry will grow at a slower pace compared to the past. Chinese consumers are more concerned about the quality and safety of eggs and egg products, as well as the environmental issues related to animal production, which presents challenges for the Chinese egg industry.

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电力系统中对称和/或不对称故障的限流器阻抗优化新方法 None

Mahmoud MODARESI, Hamid LESANI

《信息与电子工程前沿（英文）》 2018年第19卷第2期页码 297-307 doi: 10.1631/FITEE.1601689

摘要：为给电力网络设计者选择故障限流器（fault current limiters，FCLs）的阻抗类型和阻值，提出一种基于其在网络中的位置计算最佳FCL阻值的新方法。

关键词：故障限流器（FCL）；FCL阻抗；短路电流；故障电流；电力系统

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Current situation and development of wind power in China

BAO Nengsheng, NI Weidou

《能源前沿（英文）》 2007年第1卷第4期页码 371-383 doi: 10.1007/s11708-007-0056-4

摘要： The current development of wind power in China was presented in this paper. Many regions such as Xinjiang Uygur Autonomous Region, Inner Mongolia Autonomous Region and southeast coastal region, etc. in China have abundant wind energ

关键词： Xinjiang current development Mongolia Autonomous southeast coastal Autonomous

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Circumcision of preschool boys in Baghdad, Iraq: prevalence, current practice and complications

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《医学前沿（英文）》 2013年第7卷第1期页码 122-125 doi: 10.1007/s11684-013-0242-x

摘要：

Circumcision is probably one of the most ancient surgical operations and has been performed more than any other operation. The aim of this study is to assess the prevalence of circumcision in preschool boys and to present an overview of the current practices and complications in Baghdad, Iraq. A statistical survey was conducted at the Central Teaching Hospital for Children in Baghdad, Iraq during the period April 2003 to October 2004. The survey consisted of structured interviews with the accompanying parents while waiting for their children’s routine appointments. A total of 4000 boys were included. 2 443 (61%) were circumcised and the prevalence of circumcision increased from 18% at 6 months of age to reach 92% at 6 years. Only 180 (7.4%) boys had a medical reason while the rest were circumcised for religious reasons. Parents were the only determinant in deciding the time and place of religious circumcision. Circumcision was performed by a doctor in 732 (30%) boys, by a nurse in 1276 (52%) and by a traditional circumciser in 435 (18%). Post-operative complications were encountered in 209 (8.5%) boys. Circumcision is an important surgical procedure that should be performed by trained medical staff in medical institutions. Circumcision performed by medical professionals caused significantly less complications.

关键词： circumcision children prevalence religious complications

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Effect of counter current gas phase on liquid film

Shujuan LUO, Huaizhi LI, Weiyang FEI, Yundong WANG

《化学科学与工程前沿（英文）》 2009年第3卷第2期页码 135-137 doi: 10.1007/s11705-009-0129-1

摘要： Liquid film flow is very important in many industrial applications. However, there are few reports about its characteristics on structured packings. Therefore, in this paper, liquid film phenomena were investigated experimentally to exploit new approaches for intensifying the performance of the structured packings. All experiments were performed at room temperature. Water and air were the working fluids. The effect of counter current gas phase on the liquid film was taken into consideration. A high speed camera, a non-intrusive measurement technique, was used. It is shown that both liquid and gas phases have strong effects on film characteristics. In the present work, liquid film width increased by 57% because of increasing liquid flow rate, while it decreased by 25% resulting from the counter current gas phase.

关键词： counter current liquid film two phases structured packings