Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 1564

会议视频 28

会议信息 2

年份

2024 1

2023 63

2022 119

2021 107

2020 80

2019 113

2018 89

2017 88

2016 66

2015 88

2014 86

2013 66

2012 80

2011 71

2010 79

2009 51

2008 74

2007 87

2006 36

2005 24

展开︾

关键词

风险分析 9

能源 7

分析 4

可持续发展 4

对策 4

影响因素 4

数值模拟 4

有限元 4

隧道 4

ANSYS 3

COVID-19 3

“一带一路” 3

农业科学 3

抗击疫情 3

数值分析 3

环境 3

营养健康 3

裂缝 3

2035年 2

展开︾

检索范围：

排序：展示方式：

Confined masonry as practical seismic construction alternative–the experience from the 2014 Cephalonia Earthquake

Fillitsa KARANTONI, Stavroula PANTAZOPOULOU, Athanasios GANAS

《结构与土木工程前沿（英文）》 2018年第12卷第3期页码 270-290 doi: 10.1007/s11709-017-0390-1

摘要：

During August 1953 three strong earthquakes of magnitude ranging from 6.3 to 7.2 shook the Ionian Island of Cephalonia (Kefalonia), Greece, and destroyed almost the entire building stock of the Island which consisted primarily of traditional unreinforced masonry (URM) houses. The authorities went on to restructuring of the building stock, using a structural system that is most like what is known today as confined masonry. They designed about 14 types of one- to two-storey buildings providing the engineers with detailed construction plans. These buildings are known as “Arogi” buildings (Arogi in Greek meaning Aid). On the 24th of January and 3rd of February 2014, two earthquakes of magnitude 6.1 and 6.0 struck the island, causing significant soil damages, developing excessively high ground accelerations. Surprisingly, no damage was reported in the “Arogi” buildings. The seismic behavior of the buildings is examined by FEM linear analysis and it is compared to that of URM structures. Computed results illustrate that the displacements of identical URM buildings would be about twice the magnitudes observed in the corresponding “Arogi” ones, with the implication that the earthquake sequence of 2014 would have caused critical damage should the type of structure be of the URM type. Furthermore, it is illustrated that this low cost alternative method of construction is a very effective means of producing earthquake resilient structures, whereas further reduction of seismic displacement may be achieved in the order of 50% with commensurate effects on damage potential, when reinforced slabs are used to replace the timber roofs.

关键词： Cephalonia confined masonry comparative FEM analysis unreinforced masonry seismic damage

HTML PDF 收藏

FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

《机械工程前沿（英文）》 2015年第10卷第4期页码 373-379 doi: 10.1007/s11465-015-0371-9

摘要：

Fiber metal laminates have many advantages over traditional laminates (e.g., any type of fiber and resin material can be placed anywhere between the metallic layers without risk of failure of the composite fabric sheets). Furthermore, the process requirements to strictly control the temperature and punch force in fiber metal laminates are also less stringent than those in traditional laminates. To further explore the novel method, this study conducts a finite element method-based (FEM-based) strain analysis on multilayer blanks by using the 3A method. Different forming modes such as wrinkling and fracture are discussed by using experimental and numerical studies. Hydroforming is used for multilayer forming. The Barlat 2000 yield criteria and DYNAFORM/LS-DYNA are used for the simulations. Optimal process parameters are determined on the basis of fixed die-binder gap and variable cavity pressure. The results of this study will enhance the knowledge on the mechanics of multilayer structures formed by using the 3A method and expand its commercial applications.

关键词： finite element method (FEM) strain analysis multilayer sheet forming

HTML PDF 收藏

The Development and Comparative Analysis of Engineering Project Management Modes

Ji-wei Zhu,Li-nan Zhou,Ming-yuan Yu,Zhao Zhai

《工程管理前沿（英文）》 2015年第2卷第4期页码 351-358 doi: 10.15302/J-FEM-2015060

摘要： Engineering project management is the whole process of project construction management activities up to the point of achieving the goals of engineering construction, which adopts the means of planning, organizing, leading, and controlling. In addition, engineering project management modes are the works of project management and the technical guarantee of project success. For the quality and efficient transformation demands of the Chinese construction industry in the process of marketization, internationalization and informatization, based on the connotation and development path of engineering project management modes, the 16 main and new kinds of project management modes both domestically and abroad are divided into trading mode, financing mode and management mode. These have led to comparative analysis and brief commentary. Finally, it will be pointed out that the engineering project management modes move throughout the whole management process, the combined model and the expansion development of financing model. This work will provide reference for project participants to choose the appropriate project management modes and better understand building company transformation.

关键词： engineering projects management mode comparative analysis development trend

HTML PDF 收藏

Last Planner System and Scrum: Comparative analysis and suggestions for adjustments

Roshan POUDEL, Borja GARCIA de SOTO, Eder MARTINEZ

《工程管理前沿（英文）》 2020年第7卷第3期页码 359-372 doi: 10.1007/s42524-020-0117-1

摘要： This study provides a critical review of the concepts of Agile, Lean, Scrum, and Last Planner System (LPS). A comparative analysis is conducted between LPS and Scrum to expand LPS by considering Scrum’s best practices. Eight dimensions, namely, 1) origins, 2) main purpose, 3) overall system/framework process, 4) tools or artifacts maintained by the team, 5) team composition and main roles, 6) regular events or team meetings, 7) metrics/dashboards, and 8) approach to learning, are evaluated. After analyzing side by side the eight dimensions, it was found that many aspects from Scrum already exist in LPS in the same or similar form. However, the authors identify four main elements from Scrum that can be leveraged to improve the LPS benchmark, such as considering the Scrum “Increment” concept into LPS, having a clear definition of roles and responsibilities, or adding an equivalent to a Scrum Master to have a designated “rule keeper” in LPS. These opportunities to be considered in new LPS benchmarks need to be tested and validated with real applications. To the best of the authors’ knowledge, this work is the first to comprehensively compare Scrum (Agile) and LPS (Lean) and could be seen as a contribution toward the evolution of the Last Planner System for the academic and industrial environments.

关键词： Lean Construction Last Planner System Agile Scrum comparative analysis AEC projects project teams

HTML PDF 收藏

Comparative lipidomic analysis of

Bin QIAO, Hong-Chi TIAN, Ying-Jin YUAN

《化学科学与工程前沿（英文）》 2012年第6卷第4期页码 461-469 doi: 10.1007/s11705-012-1223-3

摘要： Variations in the composition and level of phospholipids (PLs) in yeast cells during industrial ethanol fermentation processes were analyzed. A comparative lipidomic method was used to investigate the changes in total cellular PLs during continuous and fed-batch/batch processes. The phospholipid metabolism in yeast changed during both processes, mainly due to the presence of long-chain poly unsaturated fatty acids (PUFA) that contained phosphatidyglycerol (PG), phosphatidylethanolamine (PE) and phosphatidylserine (PS). The complexity of the media affected the growth of the yeast and the membrane composition. Yeast incorporated lots of exogenous saturated and PUFAs from the feedstock during the fermentations. During the continuous fermentation, there was an increase in PLs with shorter chains as the fermentation progressed and early in process there were more long-chains. During the fed-batch/batch process, the PG species increased as the fermentation progressed. This is probably due to an inositol deficiency in the earlier part of the fermentation.

关键词： lipidomics systems biology phospholipids stirred-tank saccharomyces cerevisiae biorefinery engineering

HTML PDF 收藏

Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

《结构与土木工程前沿（英文）》 2015年第9卷第4期页码 478-490 doi: 10.1007/s11709-015-0317-7

摘要： This paper presents a simple and efficient approach for predicting the plastic limit loads in cracked plane-strain structures. We use two levels of mesh repartitioning for the finite element limit analysis. The master level handles an adaptive primal-mesh process through a dissipation-based indicator. The slave level performs the subdivision of each triangle into three sub-triangles and constitutes a dual mesh from a pair of two adjacent sub-triangles shared by common edges of the primal mesh. Applying a strain smoothing projection to the strain rates on the dual mesh, the incompressibility constraint and the flow rule constraint are imposed over the edge-based smoothing domains and everywhere in the problem domain. The limit analysis problem is recast into the compact form of a second-order cone programming (SOCP) for the purpose of exploiting interior-point solvers. The present method retains a low number of optimization variables. It offers a convenient way for designing and solving the large-scale optimization problems effectively. Several benchmark examples are given to show the simplicity and effectiveness of the present method.

关键词： cracked structure limit analysis von Mises criterion edge-based strain smoothing second-order cone programming adaptive

HTML PDF 收藏

A comparative thermodynamic analysis of Kalina and ORC cycles for hot dry rock: a prospect study in the

Xuelin ZHANG, Tong ZHANG, Xiaodai XUE, Yang SI, Xuemin ZHANG, Shengwei MEI

《能源前沿（英文）》 2020年第14卷第4期页码 889-900 doi: 10.1007/s11708-020-0704-1

摘要： Hot dry rock is a new type of geothermal resource which has a promising application prospect in China. This paper conducted a comparative research on performance evaluation of two eligible bottoming cycles for a hot dry rock power plant in the Gonghe Basin. Based on the given heat production conditions, a Kalina cycle and three organic Rankine cycles were tested respectively with different ammonia-water mixtures of seven ammonia mass fractions and nine eco-friendly working fluids. The results show that the optimal ammonia mass fraction is 82% for the proposed bottoming Kalina cycle in view of maximum net power output. Thermodynamic analysis suggests that wet fluids should be supercritical while dry fluids should be saturated at the inlet of turbine, respectively. The maximum net power output of the organic Rankine cycle with dry fluids expanding from saturated state is higher than that of the other organic Rankine cycle combinations, and is far higher than the maximum net power output in all tested Kalina cycle cases. Under the given heat production conditions of hot dry rock resource in the Gonghe Basin, the saturated organic Rankine cycle with the dry fluid butane as working fluid generates the largest amount of net power.

关键词： hot dry rock Kalina cycle organic Rankine cycle thermodynamic analysis

HTML PDF 收藏

用有限元强度折减法进行边坡稳定分析

郑颖人,赵尚毅,张鲁渝

《中国工程科学》 2002年第4卷第10期页码 57-61

摘要：

通过对边坡非线性有限元模型进行强度折减，使边坡达到不稳定状态时，非线性有限元静力计算将不收敛，此时的折减系数就是稳定安全系数，同时可得到边坡破坏时的滑动面。传统条分法无法获得岩质边坡的滑动面与稳定安全系数。该方法开创了求岩质边坡滑动面与稳定安全系数的先例。文章对此法的计算精度以及影响因素进行了分析。算例表明采用摩尔-库仑等面积圆屈服准则求得的稳定安全系数与简化Bishop法的误差为3%～8%，与Spencer法的误差为1%～4%，证实了其实用于工程的可行性。

关键词：边坡稳定分析有限元强度折减法屈服准则

HTML PDF 收藏

Carbon footprint assessment for the waste management sector: A comparative analysis of China and Japan

Lu SUN, Zhaoling LI, Minoru FUJII, Yasuaki HIJIOKA, Tsuyoshi FUJITA

《能源前沿（英文）》 2018年第12卷第3期页码 400-410 doi: 10.1007/s11708-018-0565-z

摘要：

Waste management is becoming a crucial issue in modern society owing to rapid urbanization and the increasing generation of municipal solid waste (MSW). This paper evaluates the carbon footprint of the waste management sector to identify direct and indirect carbon emissions, waste recycling carbon emission using a hybrid life cycle assessment and input-output analysis. China and Japan was selected as case study areas to highlight the effects of different industries on waste management. The results show that the life cycle carbon footprints for waste treatment are 59.01 million tons in China and 7.01 million tons in Japan. The gap between these footprints is caused by the different waste management systems and treatment processes used in the two countries. For indirect carbon footprints, China’s material carbon footprint and depreciation carbon footprint are much higher than those of Japan, whereas the purchased electricity and heat carbon footprint in China is half that of Japan. China and Japan have similar direct energy consumption carbon footprints. However, CO₂emissions from MSW treatment processes in China (46.46 million tons) is significantly higher than that in Japan (2.72 million tons). The corresponding effects of waste recycling on CO₂ emission reductions are considerable, up to 181.37 million tons for China and 96.76 million tons for Japan. Besides, measures were further proposed for optimizing waste management systems in the two countries. In addition, it is argued that the advanced experience that developed countries have in waste management issues can provide scientific support for waste treatment in developing countries such as China.

关键词： waste management waste recycling carbon footprint hybrid LCA

HTML PDF 收藏

Correlation of chloride diffusion coefficient and microstructure parameters in concrete: A comparativeanalysis using NMR, MIP, and X-CT

Yurong ZHANG, Shengxuan XU, Yanhong GAO, Jie GUO, Yinghui CAO, Junzhi ZHANG

《结构与土木工程前沿（英文）》 2020年第14卷第6期页码 1509-1519 doi: 10.1007/s11709-020-0681-9

摘要： Permeability is a major indicator of concrete durability, and depends primarily on the microstructure characteristics of concrete, including its porosity and pore size distribution. In this study, a variety of concrete samples were prepared to investigate their microstructure characteristics via nuclear magnetic resonance (NMR), mercury intrusion porosimetry (MIP), and X-ray computed tomography (X-CT). Furthermore, the chloride diffusion coefficient of concrete was measured to explore its correlation with the microstructure of the concrete samples. Results show that the proportion of pores with diameters<1000 nm obtained by NMR exceeds that obtained by MIP, although the difference in the total porosity determined by both methods is minimal. X-CT measurements obtained a relatively small porosity; however, this likely reflects the distribution of large pores more accurately. A strong correlation is observed between the chloride diffusion coefficient and the porosity or contributive porosity of pores with sizes<1000 nm. Moreover, microstructure parameters measured via NMR reveal a lower correlation coefficient versus the chloride diffusion coefficient relative to the parameters determined via MIP, as NMR can measure non-connected as well as connected pores. In addition, when analyzing pores with sizes>50 µm, X-CT obtains the maximal contributive porosity, followed by MIP and NMR.

关键词： permeability microstructure NMR MIP X-CT

HTML PDF 收藏

Comparative analysis of impact of human occupancy on indoor microbiomes

《环境科学与工程前沿（英文）》 2021年第15卷第5期 doi: 10.1007/s11783-020-1383-1

摘要：

• Exposure to indoor microbiomes is a public health concern in educational facilities.

关键词： Built environment Indoor microbiome Occupant Building Sequencing

HTML PDF 收藏

An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis

M. H. NGUYEN-THOI,L. Le-ANH,V. Ho-HUU,H. Dang-TRUNG,T. NGUYEN-THOI

《结构与土木工程前沿（英文）》 2015年第9卷第4期页码 341-358 doi: 10.1007/s11709-015-0302-1

摘要： A cell-based smoothed discrete shear gap method (CS-FEM-DSG3) was recently proposed and proven to be robust for free vibration analyses of Reissner-Mindlin shell. The method improves significantly the accuracy of the solution due to softening effect of the cell-based strain smoothing technique. In addition, due to using only three-node triangular elements generated automatically, the CS-FEM-DSG3 can be applied flexibly for arbitrary complicated geometric domains. However so far, the CS-FEM-DSG3 has been only developed for analyzing intact structures without possessing internal cracks. The paper hence tries to extend the CS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells by integrating the original CS-FEM-DSG3 with discontinuous and crack−tip singular enrichment functions of the extended finite element method (XFEM) to give a so-called extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3). The accuracy and reliability of the novel XCS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells are investigated through solving three numerical examples and comparing with commercial software ANSYS.

关键词： cracked Reissner-Mindlin shell free vibration analysis cell-based smoothed discrete shear gap method (CS-FEM-DSG3) extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) smoothed finite element methods (SFEM)

HTML PDF 收藏

“中国南方喀斯特”的世界自然遗产价值对比分析

熊康宁,肖时珍,刘子琦,陈品冬

《中国工程科学》 2008年第10卷第4期页码 17-28

摘要：

从地质地貌特征与演化历史方面，结合世界遗产第viii条评价标准，将“中国南方喀斯特”第一批三个遗产地置于全球视角进行对比研究，揭示其全球显著价值：云南石林形成演化历史最复杂，石柱的形态最丰富，代表一种独特的石林形成演化机制；荔波锥状喀斯特锥峰单体最典型，地貌组合形态最丰富，代表典型的锥状喀斯特地貌特征，反映出大陆热带—亚热带锥状喀斯特的地质演化模式与过程；武隆峡谷喀斯特完整地展示了整个峡谷喀斯特发育演化系统，例证了正在进行的新构造运动背景下峡谷喀斯特系统的演化过程。因此，第一批遗产地代表中国南方喀斯特地区自古生代以来长期、多期演化历史；代表地球热带 —亚热带典型的锥状、石林和峡谷喀斯特地貌特征、形成演化机制及正在进行的地质过程；代表地球三大喀斯特片区之最大片区的独特的自然地理特征。

关键词：世界遗产对比研究中国南方喀斯特

HTML PDF 收藏

医学专业目录设置的国际比较及对策研究

余中光,张鹏俊,张知新,王辰

《中国工程科学》 2020年第22卷第1期页码 139-145 doi: 10.15302/J-SSCAE-2020.01.018

摘要：

医学专业目录设置对于促进医学学科发展、培养合格的医学人才具有重要意义，在高等院校实施一流学科建设的背景下，健全、科学的专业目录显得尤为重要。为助力我国医学学科发展，本文运用文献分析法梳理了我国医学专业设置现状，系统比较了中国、美国、英国的医学专业目录类别与特点。研究发现，当前我国医学专业目录设置存在专业目录不统一、专业设置数量和内容相对滞后、临床医学专业过早专科化、与住院医师规范化培训专业目录衔接不畅等问题；建议采取统一医学专业目录、丰富学科内涵、体现交叉学科特点、建立规范的医学专业准入和退出机制等举措，推进医学专业目录与国际接轨，为培养合格、规范的医学人才提供路径指引。

关键词：医学专业目录临床医学比较分析

HTML PDF 收藏

Maximum entropy based finite element analysis of porous media

Emad NOROUZI, Hesam MOSLEMZADEH, Soheil MOHAMMADI

《结构与土木工程前沿（英文）》 2019年第13卷第2期页码 364-379 doi: 10.1007/s11709-018-0470-x

摘要： The maximum entropy theory has been used in a wide variety of physical, mathematical and engineering applications in the past few years. However, its application in numerical methods, especially in developing new shape functions, has attracted much interest in recent years. These shape functions possess the potential for performing better than the conventional basis functions in problems with randomly generated coarse meshes. In this paper, the maximum entropy theory is adopted to spatially discretize the deformation variable of the governing coupled equations of porous media. This is in line with the well-known fact that higher-order shape functions can provide more stable solutions in porous problems. Some of the benchmark problems in deformable porous media are solved with the developed approach and the results are compared with available references.

关键词： maximum entropy FEM fully coupled multi-phase system porous media