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 388

会议视频 10

年份

2023 25

2022 33

2021 38

2020 35

2019 35

2018 19

2017 25

2016 20

2015 18

2014 23

2013 10

2012 7

2011 17

2010 7

2009 19

2008 18

2007 20

2006 4

2005 6

2003 2

展开︾

关键词

神经网络 3

三峡工程 2

光催化 2

冲刷防护 2

对策 2

现状 2

群桩基础 2

聚偏氟乙烯 2

2022全球工程前沿 1

3D打印 1

3D生物打印 1

Heterodera glycines 1

AI根技术 1

Anderson 模型 1

CO2管道；离岸CCUS；海底管道；管道腐蚀；管道断裂；泄漏监测 1

Cu(Inx 1

GDM过滤技术 1

Ga1–x)Se2 1

H7N9 1

展开︾

检索范围：

排序：展示方式：

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

HTML PDF 收藏

海洋桥梁波流力作用与基础冲刷问题及对策研究

李永乐,房忱,裘放,唐浩俊,胡勇,夏云峰,魏凯,吴联活,杨绍林,向琪芪

《中国工程科学》 2019年第21卷第3期页码 18-24 doi: 10.15302/J-SSCAE-2019.03.011

摘要：

随着海洋桥梁不断向深海延伸，桥梁基础波流力作用与基础冲刷问题已成为威胁桥梁安全的主要因素。为了确保海洋桥梁设计的合理性以及建设运营的安全性，本文系统地梳理了海洋桥梁在波流力作用与基础冲刷方面所面临的主要问题，进而有针对性地提出了海洋桥梁需要在高精度预测方法、环境预报和预警系统、环境多因素耦合作用、冲刷数值模拟技术、波浪力计算方法等方向发展。研究表明，波流力作用与基础冲刷研究是海洋桥梁安全的重要保障，研究从宏观管理、行业应用、学术技术三个层面对当前问题提出了对策。

关键词：海洋桥梁波流力基础冲刷

HTML PDF 收藏

Particle swarm optimization model to predict scour depth around a bridge pier

Shahaboddin SHAMSHIRBAND, Amir MOSAVI, Timon RABCZUK

《结构与土木工程前沿（英文）》 2020年第14卷第4期页码 855-866 doi: 10.1007/s11709-020-0619-2

摘要： Scour depth around bridge piers plays a vital role in the safety and stability of the bridges. The former approaches used in the prediction of scour depth are based on regression models or black box models in which the first one lacks enough accuracy while the later one does not provide a clear mathematical expression to easily employ it for other situations or cases. Therefore, this paper aims to develop new equations using particle swarm optimization as a metaheuristic approach to predict scour depth around bridge piers. To improve the efficiency of the proposed model, individual equations are derived for laboratory and field data. Moreover, sensitivity analysis is conducted to achieve the most effective parameters in the estimation of scour depth for both experimental and filed data sets. Comparing the results of the proposed model with those of existing regression-based equations reveal the superiority of the proposed method in terms of accuracy and uncertainty. Moreover, the ratio of pier width to flow depth and ratio of 50 (mean particle diameter) to flow depth for the laboratory and field data were recognized as the most effective parameters, respectively. The derived equations can be used as a suitable proxy to estimate scour depth in both experimental and prototype scales.

关键词： scour depth bridge design and construction particle swarm optimization computational mechanics artificial intelligence bridge pier

HTML PDF 收藏

人类诱导性多能干细胞稳定生产的最新进展 Review

Ikki Horiguchi, Masahiro Kino-oka

《工程（英文）》 2021年第7卷第2期页码 144-152 doi: 10.1016/j.eng.2021.01.001

摘要：

诱导性多能干细胞（iPSC）在许多方面，如再生医学和药物筛选方面，是理想的细胞来源，其开发前景广阔。但是，目前还没有一种有效的大规模生产系统来确保诱导性多能干细胞的稳定供应。本文综述了近年来为了实现诱导性多能干细胞的稳定生产所采取的方法。本文首先讨论了诱导性多能干细胞培养过程中需要控制的因素，如养分供应、废物清除和氧气供应。然后，介绍了基于黏附、悬浮和支架的诱导性多能干细胞培养系统的最新研究。本文还讨论了细胞培养阶段之后进行的过程，如灌装和冻存过程，由于细胞悬浮液在超低温保存培养基中存活率降低，所以其生产规模受到了限制。最后，我们总结了实现诱导性多能干细胞稳定生产的可能性，并强调了仍有待克服的局限性。本文表明为了获得最佳且稳定的大规模生产诱导性多能干细胞系统，运用多学科研究手段对研究影响细胞生长和质量的复杂因素是至关重要的。

关键词：诱导性多能干细胞细胞生产扩增灌装冻存

HTML PDF 收藏

考虑射流掺气的改进冲刷模型

Rafael Duarte,António Pinheiro,Anton J. Schleiss

《工程（英文）》 2016年第2卷第3期页码 294-301 doi: 10.1016/J.ENG.2016.03.003

摘要：

基于受高速射流冲击的水垫塘中掺气对岩块稳定性影响的系统试验研究，本文给出了一种基于物理特性冲刷模型的适应性研究成果。在综合冲刷模型中实现了对射流掺气模型的改进，使其得以再现有关冲刷形成的物理– 机械过程，其中涉及三相，即水、岩体和空气。改进方法考虑了因挟带气泡引起的掺气射流动量减少以及射流扩散剪切层的能量消耗。岩块从岩体脱离取决于掺气的时均压强系数及修正的最大动力冲击系数的组合，对于深水垫塘中的高速射流，该系数为定值0.2。上述改进模型的模拟结果与卡里巴大坝冲坑原型观测结果吻合良好。

关键词：掺气上举力岩体冲刷大坝安全高速射流岩块稳定性冲刷评估

HTML PDF 收藏

诱导性多潜能干细胞(iPS)研究：现状与展望

韩为东,赵亚力,付小兵

《中国工程科学》 2009年第11卷第5期页码 81-87

摘要：

通过特定的基因组合与转染可以将已分化的体细胞诱导重编程为多潜能干细胞（iPS），是近年来干细胞研究领域最令人瞩目的一项新的干细胞制造技术。与胚胎干细胞（ES）不同，iPS细胞的制造不需要毁损胚胎，因而不会涉及更多的伦理学问题。iPS的出现不仅为体细胞重编程去分化机制的研究注入了新的活力，而且为疾病发生发展相关机制研究与特异的细胞治疗，特别是再生医学带来新的曙光。目前，iPS的研究尚处于初级阶段，文章就iPS的研究现状与应用前景进行综述和展望。

关键词：体细胞重编程 iPS细胞

HTML PDF 收藏

苏通大桥索塔深水群桩基础冲刷防护工程的设计与施工

何平,管义军,张雄文,张群,周建华

《中国工程科学》 2009年第11卷第3期页码 44-50

摘要：

从苏通大桥深水群桩基础结构方案出发，分析了冲刷及防护对大桥安全性的影响，进而从防护工程理念、结构设计与施工、防护效果监测等方面阐述了苏通大桥基础冲刷难题的解决方法。

关键词：苏通大桥深水群桩冲刷防护设计与施工

HTML PDF 收藏

Assessment of novel nature-inspired fuzzy models for predicting long contraction scouring and related uncertainties

《结构与土木工程前沿（英文）》 2021年第15卷第3期页码 665-681 doi: 10.1007/s11709-021-0713-0

摘要： The scouring phenomenon is one of the major problems experienced in hydraulic engineering. In this study, an adaptive neuro-fuzzy inference system is hybridized with several evolutionary approaches, including the ant colony optimization, genetic algorithm, teaching-learning-based optimization, biogeographical-based optimization, and invasive weed optimization for estimating the long contraction scour depth. The proposed hybrid models are built using non-dimensional information collected from previous studies. The proposed hybrid intelligent models are evaluated using several statistical performance metrics and graphical presentations. Besides, the uncertainty of models, variables, and data are inspected. Based on the achieved modeling results, adaptive neuro-fuzzy inference system–biogeographic based optimization (ANFIS-BBO) provides superior prediction accuracy compared to others, with a maximum correlation coefficient (R_test = 0.923) and minimum root mean square error value (RMSE_test = 0.0193). Thus, the proposed ANFIS-BBO is a capable cost-effective method for predicting long contraction scouring, thus, contributing to the base knowledge of hydraulic structure sustainability.

关键词： long contraction scour prediction uncertainty ANFIS model meta-heuristic algorithm

HTML PDF 收藏

Treatment of gingival hyperplasia induced by cyclosporine A

MA Jingzhi, LI Ming, CAO Yingguang

《医学前沿（英文）》 2008年第2卷第3期页码 290-294 doi: 10.1007/s11684-008-0055-5

摘要： The clinical therapy for cyclosporine A (CsA)-induced gingival hyperplasia (GH) and the pathological changes in hyperplastic gingival tissues were investigated. Nine cases of CsA-induced GH after renal transplantation were subjected to periodontal non-surgical treatment and surgical treatment and were followed up. Gingival index (GI), dental plaque index (PLI) and GH degree (GHD) at different time points were measured. Under light and electron microscopy, the pathological changes in hyperplastic gingival tissues were observed. The CsA concentrations in gingival tissues and blood were determined by using fluorescence polarization immunoassay with TDFL monoclonal antibody. The results showed that GI, PLI and GHD in patients with GH declined after periodontal treatment. Two patients suffered from different degrees of GH during the 6 months to 54 months post-transplantation. Under transmission electron microscopy, fibroblasts in the hyperplastic gingival tissues were enlarged, cytoplasmic rough endoplasmic reticula were abundant and expanded slightly, and a few fibroblasts with early apoptotic changes were seen. The concentrations of CsA in hyperplastic gingival tissues were from 351.00 to 1345.47 ng/mL, which were significantly higher than in the blood of the same patients taken at the same time points. It was concluded that GI and PLI declined after periodontal treatment in combination with surgical treatment in patients taking CsA for a long time, but in some patients, GH recurred. The fact that the concentration of CsA in hyperplastic gingival tissues is higher than in blood awaits further studies.

关键词： post-transplantation Gingival cytoplasmic CsA-induced further

HTML PDF 收藏

Alluvial channel hydrodynamics around tandem piers with downward seepage

Rutuja CHAVAN, Wenxin HUAI, Bimlesh KUMAR

《结构与土木工程前沿（英文）》 2020年第14卷第6期页码 1445-1461 doi: 10.1007/s11709-020-0648-x

摘要： In this paper, we report the turbulent flow structures and the scour geometry around two piers with different diameters. An experiment was conducted on a non-uniform sand bed with two types of tandem arrangements, namely, pier (T1) with a 75 mm front and 90 mm rear, and pier (T2) with a 90 mm front and 75 mm rear, with and without-seepage flows, respectively. A strong wake region was observed behind the piers, but the vortex strength diminished with downward seepage. Streamwise velocity was found to be maximum near the bed downstream of the piers and at the edge of the scour hole upstream of the piers. Quadrant analysis was used to recognize the susceptible region for sediment entrainment and deposition. Upstream of the piers near the bed, the moments, turbulent kinetic energy (TKE), and TKE fluxes were found to decrease with downward seepage, in contrast to those in a plane mobile bed without piers. The reduction percentages of scour depth at the rear pier compared with the front one were approximately 40% for T1 and 60% for T2. Downward seepage also resulted in restrained growth of scouring with time.

关键词： scour seepage Strouhal number tandem arrangement turbulent characteristics

HTML PDF 收藏

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

HTML PDF 收藏

Influence of fluid-structure interaction on vortex induced vibration and lock-in phenomena in long span

Nazim Abdul NARIMAN

《结构与土木工程前沿（英文）》 2016年第10卷第4期页码 363-384 doi: 10.1007/s11709-016-0353-y

摘要： In this paper, deck models of a cable stayed bridge are generated in ABAQUS-finite element program once using only CFD model (one-way fluid-structure interaction) and another by using both the CFD model and the CSD model together (two-way fluid-structure interaction) in a co-simulation. Shedding frequencies for the associated wind velocities in the lock-in region are calculated in both approaches. The results are validated with Simiu and Scanlan results. The lift and drag coefficients are determined for the two approaches and the latter results are validated with the flat plate theory results by Munson and coauthors. A decrease in the critical wind velocity and the shedding frequencies considering two-way approach was determined compared to those obtained in the one-way approach. The results of the lift and drag forces in the two-way approach showed appreciable decrease in their values. It was concluded that the two-way approach predicts earlier vortex induced vibration for lower critical wind velocities and lock-in phenomena will appear at lower natural frequencies of the long span bridges. This helps the designers to efficiently plan and consider for the design and safety of the long span bridge against this type of vibration.

关键词： vortex-induced vibration fluid-structure interaction Strouhal number lock-in kinetic energy

HTML PDF 收藏

Formation of microporous polymeric membranes via thermally induced phase separation: A review

Min Liu,Shenghui Liu,Zhenliang Xu,Yongming Wei,Hu Yang

《化学科学与工程前沿（英文）》 2016年第10卷第1期页码 57-75 doi: 10.1007/s11705-016-1561-7

摘要： A review of recent research related to microporous polymeric membranes formed via thermally induced phase separation (TIPS) and the morphologies of these membranes is presented. A summary of polymers and suitable diluents that can be used to prepare these microporous membranes via TIPS are summarized. The effects of different kinds of polymer materials, diluent types, cooling conditions, extractants and additive agents on the morphology and performance of TIPS membranes are also discussed. Finally new developments in TIPS technology are summarized.

关键词： polymer microporous membrane thermally induced phase separation

HTML PDF 收藏

An overview of vortex-induced vibration (VIV) of bridge decks

Teng WU, Ahsan KAREEM

《结构与土木工程前沿（英文）》 2012年第6卷第4期页码 335-347 doi: 10.1007/s11709-012-0179-1

摘要： A brief overview of vortex-induced vibration (VIV) of circular cylinders is first given as most of VIV studies have been focused on this particular bluff cross-section. A critical literature review of VIV of bridge decks that highlights physical mechanisms central to VIV from a renewed perspective is provided. The discussion focuses on VIV of bridge decks from wind-tunnel experiments, full-scale observations, semi-empirical models and computational fluids dynamics (CFD) perspectives. Finally, a recently developed reduced order model (ROM) based on truncated Volterra series is introduced to model VIV of long-span bridges. This model captures successfully salient features of VIV at “lock-in” and unlike most phenomenological models offers physical significance of the model kernels.

关键词： vortex-induced vibration (VIV) Volterra series bridge

HTML PDF 收藏

Synthesis and ultraviolet/aggregation-induced emission investigation of novel tetraphenylvinyl hydrazone

《化学科学与工程前沿（英文）》 2023年第17卷第12期页码 2061-2073 doi: 10.1007/s11705-023-2366-0

摘要： Herein, three novel tetraphenylethylene hydrazone chemosensors TC12, SC16, and TC16 are prepared for the selective detection of F⁻. Two NH and one C=N units are incorporated into the sensors for better colorimetric responses, whereas the tetraphenyl unit is in charge of the aggregation-induced emission effect. Among them, compounds SC16 and TC16 form stable gels with some organic solvents. All the tetrahydrofuran/H₂O solutions of the three compounds exhibit aggregation-induced emission effect, whereby the fluorescence emission increases by varying degrees with the volume of poor solvent water. Moreover, good aggregation-induced emission effects are observed in the self-assembly of SC16 and TC16. As a sample chemosensor, TC12 in tetrahydrofuran responds to F⁻ selectively with high sensitivity, with the colorimetric and fluorometric detection limits of 8.25 × 10⁻⁷ mol·L^–1 and 2.69 × 10⁻⁷ mol·L^–1, respectively. The reversible gel-sol-gel phase transition and color changes indicate that both SC16-dimethyl sulfoxide and TC16-ethyl acetate gels specifically respond to F^– with good sensitivity. The detection results are well supported by ultraviolet-visible spectroscopy, fluorescent spectroscopy, and ¹H nuclear magnetic resonance. More importantly, the driving forces of gelation are visually clarified through the single crystal X-ray analysis of compound TOMe.

关键词： organogelator tetraphenylvinyldrazone single crystal aggregation-induced emission effect ion sensing