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Impacts of opening baffle of city road tunnels on natural ventilation performance

Weixiao YANG, Jincheng XING, Jianxing LI, Jihong LING, Haixian HAO, Zhiqiang YAN

《结构与土木工程前沿（英文）》 2013年 第7卷 第1期   页码 55-61 doi: 10.1007/s11709-013-0194-x

摘要： Based on the opening baffle mode for natural ventilation of city road tunnels, this paper studies the impacts of opening baffle on natural ventilation performance by verifying numerical simulation through model tests. By analyzing the impacts of installation angle, dimension, location, and quantity of opening baffle on ventilation performance, the paper reached the conclusions as follows: 1) When installation angle is larger than 45° and tunnel ventilation is well operated, the baffle exhaust could increase by at least 30% compared to when there is no baffle. 2) The baffle reaches its optimal performance when the length of the baffle is equal to the width of the city road tunnels. 3) Baffle exhaust could increase by 30% when it is installed in the downstream of openings. 4) The performance of a single baffle is better than that of multiple baffles.

关键词： city road tunnel     numerical simulation     baffle     top opening     natural ventilation    

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Liquid metal printing opening the way for energy conservation in semiconductor manufacturing industry

《能源前沿（英文）》 2022年 第16卷 第4期   页码 542-547 doi: 10.1007/s11708-022-0834-8

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Two-dimensional modeling of sintering of a powder layer on top of nonporous substrate

Tiebing CHEN, Yuwen ZHANG,

《机械工程前沿（英文）》 2010年 第5卷 第2期   页码 143-148 doi: 10.1007/s11465-010-0006-0

摘要： Selective laser sintering (SLS) of a two-component metal powder layer on the top of multiple sintered layers by a moving Gaussian laser beam is modeled. The loose metal powder layer is composed of a powder mixture with significantly different melting points. The physical model that accounts the shrinkage induced by melting is described by using a temperature-transforming model. The effects of the porosity and the thickness of the atop loose powder layer with different numbers of the existing sintered metal powder layers below on the sintering process are numerically investigated. The present work will provide a better understanding to simulate much more complicated three-dimensional SLS process.

关键词： laser     sintering     melting     solidification     heat transfer    

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The most influential “Top 10 Events” in carbon neutrality and climate change in 2022

《能源前沿（英文）》 2023年 第17卷 第1期   页码 1-4 doi: 10.1007/s11708-023-0869-5

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Lateral-torsional buckling capacity assessment of web opening steel girders by artificial neural networks

Yasser SHARIFI,Sajjad TOHIDI

《结构与土木工程前沿（英文）》 2014年 第8卷 第2期   页码 167-177 doi: 10.1007/s11709-014-0236-z

摘要： Bridge girders exposed to aggressive environmental conditions are subject to time-variant changes in resistance. There is therefore a need for evaluation procedures that produce accurate predictions of the load-carrying capacity and reliability of bridge structures to allow rational decisions to be made about repair, rehabilitation and expected life-cycle costs. This study deals with the stability of damaged steel I-beams with web opening subjected to bending loads. A three-dimensional (3D) finite element (FE) model using ABAQUS for the elastic flexural torsional analysis of I-beams has been used to assess the effect of web opening on the lateral buckling moment capacity. Artificial neural network (ANN) approach has been also employed to derive empirical formulae for predicting the lateral-torsional buckling moment capacity of deteriorated steel I-beams with different sizes of rectangular web opening using obtained FE results. It is found out that the proposed formulae can accurately predict residual lateral buckling capacities of doubly-symmetric steel I-beams with rectangular web opening. Hence, the results of this study can be used for better prediction of buckling life of web opening of steel beams by practice engineers.

关键词： steel I-beams     lateral-torsional buckling     finite element (FE) method     artificial neural network (ANN) approach    

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Improvement of part-load performance of gas turbine by adjusting compressor inlet air temperature and IGV opening

《能源前沿（英文）》 2022年 第16卷 第6期   页码 1000-1016 doi: 10.1007/s11708-021-0746-z

摘要： A novel adjusting method for improving gas turbine (GT) efficiency and surge margin (SM) under part-load conditions is proposed. This method adopts the inlet air heating technology, which uses the waste heat of low-grade heat source and the inlet guide vane (IGV) opening adjustment. Moreover, the regulation rules of the compressor inlet air temperature and the IGV opening are studied comprehensively to optimize GT performance. A model and calculation method for an equilibrium running line is adopted based on the characteristic curves of the compressor and turbine. The equilibrium running lines calculated through the calculation method involve three part-load conditions and three IGV openings with different inlet air temperatures. The results show that there is an optimal matching relationship between IGV opening and inlet air temperature. For the best GT performance of a given load, the IGV could be adjusted according to inlet air temperature. In addition, inlet air heating has a considerable potential for the improvement of part-load performance of GT due to the increase in compressor efficiency, combustion efficiency, and turbine efficiency as well as turbine inlet temperature, when inlet air temperature is lower than the optimal value with different IGV openings. Further, when the IGV is in a full opening state and an optimal inlet air temperature is achieved by using the inlet air heating technology, GT efficiency and SM can be obviously higher than other IGV openings. The IGV can be left unadjusted, even when the load is as low as 50%. These findings indicate that inlet air heating has a great potential to replace the IGV to regulate load because GT efficiency and SM can be remarkably improved, which is different from the traditional viewpoints.

关键词： inlet air temperature     inlet guide vane (IGV) opening     part-load     equilibrium running line     gas turbine (GT) efficiency     surge margin (SM)    

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Analysis of catchment evapotranspiration at different scales using bottom-up and top-down approaches

Xiangyu XU, Dawen YANG,

《结构与土木工程前沿（英文）》 2010年 第4卷 第1期   页码 65-77 doi: 10.1007/s11709-010-0002-9

摘要： Physically-based hydrological models are used to predict catchment water balance through detailed simulation of hydrological processes at small temporal and spatial scales. However, annual catchment water balance can also be easily and simply predicted using lumped conceptual model. Comparison between physically-based hydrological models and lumped conceptual models can help us understand the dominant factors on catchment water balance at different scales. In this paper, a distributed physically-based hydrological model (i.e., bottom-up approach) and a simple water-energy balance model (i.e., top-down approach) are used to predict actual evapotranspiration in nine sub-catchments, and the whole basin of the Luan River in northern China. Both simulations give very close values of annual evapotranspiration and show the same complementary relationship between actual and potential evapotranspiration at annual time scale. From the analysis at different time scales through comparison of the top-down and the bottom-up methods, it is shown that the annual catchment evapotranspiration is controlled mainly by annual precipitation and potential evapotranspiration, and the variability of soil water and vegetation becomes more important at a smaller time scale in the study areas. It is also known that the relationship between potential and actual evapotranspiration shows a highly nonlinear relationship at the annual and catchment scale but can be simplified to a linear relationship at hourly temporal and hillslope scales, which is commonly used in the physically-based hydrological models.

关键词： catchment evapotranspiration     distributed hydrological model     water-energy balance model     top-down and bottom-up approaches    

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Weakening behavior of waterproof performance in joints of shield tunnels under adjacent constructions

《结构与土木工程前沿（英文）》   页码 884-900 doi: 10.1007/s11709-022-0912-3

摘要： Groundwater leakage in shield tunnels poses a threat to the safety and durability of tunnel structures. Disturbance of adjacent constructions during the operation of shield tunnels frequently occurs in China, leading to deformation of tunnel lining and leakage in joints. Understanding the impact of adjacent constructions on the waterproofing performance of the lining is critical for the protection of shield tunnels. In this study, the weakening behavior of waterproof performance was investigated in the joints of shield tunnels under transverse deformation induced by adjacent construction. First, the relationship between the joint opening and transverse deformation under three typical adjacent constructions (upper loading, upper excavation, and side excavation) was investigated via elaborate numerical simulations. Subsequently, the evolution of the waterproof performance of a common gasket with a joint opening was examined by establishing a coupled Eulerian–Lagrangian model of joint seepage, and a formula describing the relationship between waterproof performance and joint opening was proposed. Finally, the weakening law of waterproofing performance was investigated based on the results of the aforementioned studies. It was determined that the joints with the greatest decline in waterproof performance were located at the tunnel shoulder in the upper loading case, tunnel crown in the upper excavation case, and tunnel shoulder in the side excavation case. When the waterproof performance of these joints decreased to 50% and 30%, the transverse deformations were 60 and 90 mm under upper loading, 90 and 140 mm under upper excavation, and 45 and 70 mm under side excavation, respectively. The results provide a straightforward reference for setting a controlled deformation standard considering the waterproof performance.

关键词： shield tunnel     waterproof performance     horizontal transverse deformation     joint opening     weakening behavior    

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气体分布板开孔结构对流化床干燥性能的影响

刘巍,汤文成

《中国工程科学》 2006年 第8卷 第2期   页码 47-50

摘要：

针对惰性粒子流化床干燥器，以洗衣粉悬浮液为对象，先后进行了气体分布板开直孔和开斜孔的流化干燥实验。通过测定干燥器的流体力学特性曲线，以及在相同进料量、进风温度、进风速度或惰性粒子直径条件下的体积传热系数曲线和热效率曲线，考察和分析了气体分布板两种不同的开孔结构对干燥器流体力学和传热性能的影响。结果表明，气体分布板开斜孔的床内气流阻力要高于开直孔的气流阻力，但其体积传热系数和热效率相对较高，即斜孔较直孔更加有利于床内传热。在此基础上，对惰性粒子流化床干燥器的生产调节措施进行了初步探讨。

关键词： 气体分布板     开孔结构     惰性粒子     流化床     干燥性能    

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我国综采放顶煤开采技术及其展望

赵经彻

《中国工程科学》 2001年 第3卷 第4期   页码 9-16

摘要：

介绍了20世纪80年代中期以来对我国煤炭工业有重大影响的综采放顶煤开采技术的概况；论述了我国科技人员在该项技术进步中在顶煤可放性评价、岩（煤）运动规律及支架围岩关系、提高回收率的技术和工艺、安全控制、大功率成套设备研制等方面的创造性贡献；对综采放顶煤技术的发展趋势作出了评价。

关键词： 煤炭开采     综采放顶煤     顶板管理     资源回收率     煤矿安全    

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Development of clean energy and environmental technologies to address humanity’s top problems

Geoff G. X. Wang

《化学科学与工程前沿（英文）》 2012年 第6卷 第1期   页码 1-2 doi: 10.1007/s11705-011-1145-5

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GENOME EDITING: A GROUND BREAKING RESEARCH HAS BEEN RANKED TOP 10 ENGINEERING FRONTS FROM 2017 TO 2021

《农业科学与工程前沿（英文）》 2022年 第9卷 第2期   页码 309-311 doi: 10.15302/J-FASE-2022440

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近六年《麻省理工科技评论》“全球十大突破性技术”解析与启示

屠海令,孙棕檀,姚源,徐源

《中国工程科学》 2017年 第19卷 第5期   页码 85-91 doi: 10.15302/J-SSCAE-2017.05.015

摘要：

《麻省理工科技评论》自2001年起每年发布“全球十大突破性技术”，关注技术的商业应用潜力及其对人类生活和社会的重大影响。本文从技术影响类型、技术领域等角度入手，对《麻省理工科技评论》近六年发布的60项突破性技术进行深入理解和分析，为准确把握未来产业动态和科技趋势提供借鉴。

关键词： 科技评论     “全球十大突破性技术”     商业     产业     社会    

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Top-geoherbs of traditional Chinese medicine: common trait, quality characteristics and formation

Luqi Huang, Lanping Guo, Chaoyi Ma, Wei Gao, Qingjun Yuan

《医学前沿（英文）》 2011年 第5卷 第2期   页码 185-194 doi: 10.1007/s11684-011-0141-y

摘要： Top-geoherbs used in China are always featured with high qualities, and they grow in specified areas with specific environment. Recently, researches on top-geoherbs have attracted increasing attention in China and other countries. In order to have a thorough knowledge of top-geoherbs, this article reviews the concept, historical evolution, common trait and quality characteristics of top-geoherbs, and explains the forming mechanism including genetic mechanism and environmental mechanism. In addition, it introduces the influence of human factors on the quality of top-geoherbs. Finally, it proposes some problems that should be paid attention to in the researches on top-geoherbs.

关键词： top-geoherbs     common trait     quality characteristics     formation     biological mechanism    

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标题 作者 时间 类型 操作

Impacts of opening baffle of city road tunnels on natural ventilation performance

Weixiao YANG, Jincheng XING, Jianxing LI, Jihong LING, Haixian HAO, Zhiqiang YAN

期刊论文

Liquid metal printing opening the way for energy conservation in semiconductor manufacturing industry

期刊论文

Two-dimensional modeling of sintering of a powder layer on top of nonporous substrate

Tiebing CHEN, Yuwen ZHANG,

期刊论文

The most influential “Top 10 Events” in carbon neutrality and climate change in 2022

期刊论文

Lateral-torsional buckling capacity assessment of web opening steel girders by artificial neural networks

Yasser SHARIFI,Sajjad TOHIDI

期刊论文

Improvement of part-load performance of gas turbine by adjusting compressor inlet air temperature and IGV opening

期刊论文

Analysis of catchment evapotranspiration at different scales using bottom-up and top-down approaches

Xiangyu XU, Dawen YANG,

期刊论文

优秀论文尤须在权威刊物上发表——《中国工程科学》“学位论文精选”开栏寄语

null

期刊论文

Weakening behavior of waterproof performance in joints of shield tunnels under adjacent constructions

期刊论文

气体分布板开孔结构对流化床干燥性能的影响

刘巍,汤文成

期刊论文

我国综采放顶煤开采技术及其展望

赵经彻

期刊论文

Development of clean energy and environmental technologies to address humanity’s top problems

Geoff G. X. Wang

期刊论文

GENOME EDITING: A GROUND BREAKING RESEARCH HAS BEEN RANKED TOP 10 ENGINEERING FRONTS FROM 2017 TO 2021

期刊论文

近六年《麻省理工科技评论》“全球十大突破性技术”解析与启示

屠海令,孙棕檀,姚源,徐源

期刊论文

Top-geoherbs of traditional Chinese medicine: common trait, quality characteristics and formation

Luqi Huang, Lanping Guo, Chaoyi Ma, Wei Gao, Qingjun Yuan

期刊论文