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Proposing two new methods to decrease lateral-torsional buckling in reduced beam section connections

Samira EBRAHIMI; Nasrin BAKHSHAYESH EGHBALI; Mohammad Mehdi AHMADI

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 12,   Pages 1581-1598 doi: 10.1007/s11709-022-0886-1

Abstract: : (1) RBS with stiffener (RBS-ST) and (2) RBS with reduced web (RW-RBS) connections.In the first connection (RBS-ST), a series of stiffeners is connected to the beam in the reduced flangeFive beam-to-column joints with three different connections, including RBS, RBS-ST, and RW-RBS connectionsAccording to the results, RBS-ST and RW-RBS connections can decrease or even eliminate lateral-torsionaldrift, while no strength degradation was observed in RBS-ST connection until 8% drift.

Keywords： RBS     RBS-ST     RW-RBS     lateral-torsional buckling     cyclic performance    

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Silk Roads for the 21st Century: Engineering Mega-Infrastructure for Development and Sustainability

Tony Marjoram

Frontiers of Engineering Management 2016, Volume 3, Issue 3,   Pages 187-196 doi: 10.15302/J-FEM-2016038

Abstract: Mega infrastructure such as the Silk Road Economic Belt and 21st Century Maritime Silk Road, the “One

Keywords： infrastructure     growth     development     sustainability     change     new Silk Roads    

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Digital manufacturing—the development direction of the manufacturing technology in the 21st century

XIONG You-lun, YIN Zhou-ping

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 125-130 doi: 10.1007/s11465-006-0021-3

Abstract: After introducing the concepts of digital manufacturing technology, the discipline framework of digital manufacturing is presented in the paper by discussing its basic concept, theory foundation, key technology and scientific problems in detail. As the core of the advanced manufacturing technology, digital manufacturing is gradually becoming the main manufacturing technology of the twenty-first century. Firstly, the main features of digital manufacturing are indicated and its key supporting technologies are investigated by grouping them into four levels related to product development, numerical control, production management, and enterprise collaboration, respectively. Moreover, the existing problems in the research on the multi-discipline theory foundation of digital manufacturing such as manufacturing informatics, computational manufacturing, and manufacturing intelligence, are also indicated. Then, the core scientific problems of digital manufacturing are discussed in depth, which focuses on digitization of manufacturing information, modeling of manufacturing constraints, high-speed and high-precision numerical control theory, and Internet-based collaboration and integration. Lastly, the development trends and application perspectives of digital manufacturing are concluded.

Keywords： development     foundation     multi-discipline     scientific     supporting    

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Livestock breeding for the 21st century: the promise of the editing revolution

Chris PROUDFOOT, Gus MCFARLANE, Bruce WHITELAW, Simon LILLICO

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 2,   Pages 129-135 doi: 10.15302/J-FASE-2019304

Abstract:

In recent years there has been a veritable explosion in the use of genome editors to create site-specific changes, both and , to the genomes of a multitude of species for both basic research and biotechnology. Livestock, which form a vital component of most societies, are no exception. While selective breeding has been hugely successful at enhancing some production traits, the rate of progress is often slow and is limited to variants that exist within the breeding population. Genome editing provides the potential to move traits between breeds, in a single generation, with no impact on existing productivity or to develop phenotypes that tackle intractable issues such as disease. As such, genome editors provide huge potential for ongoing livestock development programs in light of increased demand and disease challenge. This review will highlight some of the more notable agricultural applications of this technology in livestock.

Keywords： cattle     pig     sheep     chicken     aquaculture     CRISPR    

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Sustainable intensification of agriculture is key to feeding Africa in the 21st century

Shenggen FAN

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 4,   Pages 366-370 doi: 10.15302/J-FASE-2020342

Abstract:

Africa in facing numerous challenges in the 21st century in feeding its rapidly increasing population

Keywords： Africa     sustainable intensification     Agricultural Green Development     climate change     malnutrition    

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An Opinion on the Development of Oil and Gas Industry in the 21st Century

Chen Junwu

Strategic Study of CAE 2000, Volume 2, Issue 4,   Pages 21-24

Abstract:

The speed of international social-economic development closely depends upon the growth of world energy consumption, which in turn has to meet the stringent environmental protection policy that controls the total amount of greenhouse gas released to the atmosphere in the burning of fuel. In order to achieve the sustainable development of all nations, it is advisable to give an outlook to the future situation of world oil and gas industry as the representatives of the non-regenerable energy resources. This paper presents an opinion on the future development of oil and gas industry based on limited data published in literature together with controversial forecasts by different authors and covers four subjects： (1) the demand and supply of oil and gas in the new century; (2) the specifications of oil products to meet the environmental regulations; (3) the role of unconventional oil in the energy industry and (4) the brilliant future of natural gas.

Keywords： 21st centurey     petroleum     natural gas     oil and gas industry    

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Genomic Epidemiology of ST34 Monophasic Salmonella enterica Serovar Typhimurium from Clinical Patients Article

Yujiao Mu, Ruichao Li, Pengcheng Du, Pei Zhang, Yan Li, Shenghui Cui, Séamus Fanning, Li Bai

Engineering 2022, Volume 15, Issue 8,   Pages 34-44 doi: 10.1016/j.eng.2022.05.006

Abstract: prevalence, antimicrobial resistance (AMR) phenotypes, and population genomics of sequence type 34 (ST34A total of 100 ST34 S. 4,[5],12:i:- isolates were studied from 2008 to 2017 and found mostly

Keywords： Salmonella Typhimurium monophasic variant     ST34     Prevalence     Phylogenetic analysis     Chinese lineages    

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An Algorithm to compute damage from load in composites

DUNANT, Stéphane P. A. BORDAS, Pierre KERFRIDEN, Karen L. SCRIVENER, Timon RABCZUK

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 180-193 doi: 10.1007/s11709-011-0107-9

Abstract: We present a new method to model fracture of concrete based on energy minimisation. The concrete is considered on the mesoscale as composite consisting of cement paste, aggregates and micro pores. In this first step, the alkali-silica reaction is taken into account through damage mechanics though the process is more complex involving thermo-hygro-chemo-mechanical reaction. We use a non-local damage model that ensures the well-posedness of the boundary value problem (BVP). In contrast to existing methods, the interactions between degrees of freedom evolve with the damage evolutions. Numerical results are compared to analytical and experimental results and show good agreement.

Keywords： Concrete     damage     prediction     modelling     energy minimisation     ASR    

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Self-motions of 3-RPS manipulators

HUSTY, Stéphane CARO, Philippe WENGERY

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 1,   Pages 62-69 doi: 10.1007/s11465-013-0366-3

Abstract:

Recently a complete kinematic description of the 3-RPS parallel manipulator was obtained using algebraic constraint equations. It turned out that the workspace splits into two components describing two kinematically different operation modes. In this paper the algebraic description is used to give a complete analysis of all possible self-motions of this manipulator in both operation modes. Furthermore it is shown that a transition from one operation mode into the other in a self-motion is possible.

Keywords： 3-RPS-manipulator     singularity     self-motion    

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Science and Technology in Human's Living and Survival in the 21st Century

Jiang Zhenghua

Strategic Study of CAE 2002, Volume 4, Issue 4,   Pages 1-11

Abstract:

This article, from the angle of management, reviews the world history over the past century, studies the prospective progress in the new century, and discusses ways for promoting world peace and cooperation and realizing common development.

Keywords： 21st century     progress in science and technology     human's living and survival    

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Orienting the Forest Remote Sensing of the 21st Century in China

Zhao Xianwen

Strategic Study of CAE 1999, Volume 1, Issue 3,   Pages 16-21

Abstract:

In the light of the mentioned above, the forest remote sensing perspective of the 21 st century

Keywords： forestry     remote sensing     developing of sustainable forestry     forestry towards the 21 st century    

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Should medium-sized contractors still implement home-made information technologies on construction sites?

Conrad BOTON, Éric ST-PIERRE, Gabriel LEFEBVRE

Frontiers of Engineering Management 2020, Volume 7, Issue 1,   Pages 142-158 doi: 10.1007/s42524-019-0065-9

Abstract: Despite the increasing dissemination of the Building Information Modeling (BIM) approach, many firms are still far from BIM and are only starting to adopt information technologies. We conducted an ethnographic action research with an industrial partner that implements information technologies on its construction sites, with a strong preference for home-made applications. Results show that the development of such applications faces difficulties and that multiple iterations and versions are necessary before achieving the expected goals because the required competencies are lacking among internal development teams. Moreover, initial needs evolve considerably throughout the application’s development and evaluation process. However, notwithstanding the difficulties encountered during the different application development phases, the industrial partner believes the decision to be worthwhile because of the desire to have internal control over the project data and the need to consider certain specificities related to business processes.

Keywords： small- and medium-sized enterprises     mobile computing     mobile cloud computing     information technology for construction     construction site     ethnographic action research    

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The Challenge of Computing and Information Technology in the 21st Century

Wm. A. Wulf

Strategic Study of CAE 2000, Volume 2, Issue 10,   Pages 9-12

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Strengthening the Rise of the 21st-Century Maritime Silk Road Strategic Pivot

Zhang Dayong

Strategic Study of CAE 2016, Volume 18, Issue 2,   Pages 105-110 doi: 10.15302/J-SSCAE-2016.02.013

Abstract:

The strategic pivot of the 21st-Century Maritime Silk Road refers to China's policy of bolsteringThis paper also advances some policy recommendations for the 21st-Century Maritime Silk Road such as

Keywords： 21st-Century Maritime Silk Road     strategy pivot     economy and trade cooperation     science and technology    

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Factors, Areas of Cooperation and Mechanisms for International Cooperation in the Blue Economy of the 21st-Century

Chen Mingbao and Han Limin

Strategic Study of CAE 2016, Volume 18, Issue 2,   Pages 98-104 doi: 10.15302/J-SSCAE-2016.02.012

Abstract: The 21st-Century Maritime Silk Road and Economic Belt is an important platform for cooperation on the

Keywords： 21st-Century Maritime Silk Road     blue economy     driving factors     cooperative fields     cooperative mechanism    

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Title Author Date Type Operation

Proposing two new methods to decrease lateral-torsional buckling in reduced beam section connections

Samira EBRAHIMI; Nasrin BAKHSHAYESH EGHBALI; Mohammad Mehdi AHMADI

Journal Article

Silk Roads for the 21st Century: Engineering Mega-Infrastructure for Development and Sustainability

Tony Marjoram

Journal Article

Digital manufacturing—the development direction of the manufacturing technology in the 21st century

XIONG You-lun, YIN Zhou-ping

Journal Article

Livestock breeding for the 21st century: the promise of the editing revolution

Chris PROUDFOOT, Gus MCFARLANE, Bruce WHITELAW, Simon LILLICO

Journal Article

Sustainable intensification of agriculture is key to feeding Africa in the 21st century

Shenggen FAN

Journal Article

An Opinion on the Development of Oil and Gas Industry in the 21st Century

Chen Junwu

Journal Article

Genomic Epidemiology of ST34 Monophasic Salmonella enterica Serovar Typhimurium from Clinical Patients

Yujiao Mu, Ruichao Li, Pengcheng Du, Pei Zhang, Yan Li, Shenghui Cui, Séamus Fanning, Li Bai

Journal Article

An Algorithm to compute damage from load in composites

DUNANT, Stéphane P. A. BORDAS, Pierre KERFRIDEN, Karen L. SCRIVENER, Timon RABCZUK

Journal Article

Self-motions of 3-RPS manipulators

HUSTY, Stéphane CARO, Philippe WENGERY

Journal Article

Science and Technology in Human's Living and Survival in the 21st Century

Jiang Zhenghua

Journal Article

Orienting the Forest Remote Sensing of the 21st Century in China

Zhao Xianwen

Journal Article

Should medium-sized contractors still implement home-made information technologies on construction sites?

Conrad BOTON, Éric ST-PIERRE, Gabriel LEFEBVRE

Journal Article

The Challenge of Computing and Information Technology in the 21st Century

Wm. A. Wulf

Journal Article

Strengthening the Rise of the 21st-Century Maritime Silk Road Strategic Pivot

Zhang Dayong

Journal Article

Factors, Areas of Cooperation and Mechanisms for International Cooperation in the Blue Economy of the 21st-Century

Chen Mingbao and Han Limin

Journal Article