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多入多出系统的空口测量 Review Articles

李俊1,2,漆一宏3,范峻4

《信息与电子工程前沿（英文）》 2021年第22卷第8期页码 1046-1058 doi: 10.1631/FITEE.2000230

摘要：对于第五代（5G）和更高集成度的无线系统，OTA测试可能是能够准确测量收发器性能的唯一可靠方法，可用于设备认证，并为设计验证和优化提供反馈。本文概述了评估OTA MIMO性能的3种主要方法，即多探头法（MPAC）、混响室加信道模拟器（RC+CE）方法和辐射两步法（RTS），目的是为5G及未来无线系统的无线性能测试提供有用指导。

关键词：空中（OTA）测试；无线性能测试；第五代（5G）及超5代；多入多出（MIMO）；多探头法（MPAC）；辐射两步法（RTS）；混响室加通道模拟器法（RC+CE）

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量子点细胞自动机中四值逻辑门的设计与模拟新概念 Research Articles

Alireza NAVIDI1, Reza SABBAGHI-NADOOSHAN2, Massoud DOUSTI1

《信息与电子工程前沿（英文）》 2021年第22卷第11期页码 1441-1550 doi: 10.1631/FITEE.2000590

摘要：该概念已在本团队专为四值QCA模型开发的量子点细胞自动模拟器（QCASim）中设定。设计了基本四值QCA逻辑门，如MIN、MAX和不同类型反相器（SQI，PQI，NQI和IQI），并通过QCASim验证。本文将例示QCASim如何通过其方便的CAD工具集快速而准确地工作。采用所设计的主要门电路设计了一个1×4译码器。基于QQCA设计的电路，取得最小延迟、最小面积和最低复杂度。

关键词：量子点细胞自动机（QCA）；四值逻辑；量子点细胞自动模拟器（QCASim）；四值QCA（QQCA）；四值译码器；四值门

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燃气轮机燃烧室效率模化试验中压力指数的研究

杨锐,王应时

《中国工程科学》 2003年第5卷第10期页码 83-87

摘要：

通过对2种不同类型的燃气轮机燃烧室的数值计算，研究了不同燃烧类型对燃气轮机燃烧室效率模化试验中压力指数选取的影响。结果表明，压力指数除受到燃料、余气系数等影响之外，燃烧类型也有很大影响。对于以碳氢化合物为燃料，化学反应控制类型燃烧室模化中N值相对较大，大致范围为1.6～2.0。当燃烧过程受扩散控制时， N值相对较小，大致范围为1.0～1.4。

关键词：燃烧室效率模化试验压力指数数值模拟

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基于碳纳米管场效应管的新型三元半加器及乘法器 Article

Sepehr TABRIZCHI,Nooshin AZIMI,Keivan NAVI

《信息与电子工程前沿（英文）》 2017年第18卷第3期页码 423-433 doi: 10.1631/FITEE.1500366

摘要：本文利用微纳技术和三元逻辑设计出了新型的半加器和乘法器。微纳技术和三元逻辑的采纳降低了元件功耗和面积，提升了元件运行速度。

关键词：碳纳米管场效应管设计；三元；半加器；乘法器；多值逻辑

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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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中国大陆典型水下隧道工程案例与技术

洪开荣

《工程（英文）》 2017年第3卷第6期页码 871-879 doi: 10.1016/j.eng.2017.12.007

摘要：文章按工法分类，简要介绍了我国水下隧道的发展历程与现状，同时结合典型水下隧道的工程案例，综述了包括盾构法、钻爆法、沉管法修建的我国几座主要水下隧道工程，以及在这些工程中的技术创新所解决的重难点问题，如地质综合预报、注浆加固方法与工艺、软弱地层超浅埋大断面隧道的设计与施工、限排降压换刀、孤石的探测与处理、高地震烈度区的水下隧道建设、沉管基槽高回淤的处理等；综合分析了现有的技术基础与建设能力，提出了对我国三大海峡通道（琼州海峡通道、渤海湾海峡通道、台湾海峡通道）的一些思考，并指出海峡通道建设还需进一步研究的问题。

关键词：水下隧道海峡通道盾构法沉管法钻爆法

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Effect of RC wall on the development of plastic rotation in the beams of RC frame structures

Amar KAHIL, Aghiles NEKMOUCHE, Said BOUKAIS, Mohand HAMIZI, Naceur Eddine HANNACHI

《结构与土木工程前沿（英文）》 2018年第12卷第3期页码 318-330 doi: 10.1007/s11709-017-0420-z

摘要：

The objective of this study is, to interpret the influence of reinforced concrete walls addition in reinforced concrete frame structures considering behavior laws that reflects the actual behavior of such structures, by means of Castem2000computer code (pushover analysis). A finite element model is proposed in this study, using the TAKEDA modified behavior model with Timoshenko beams elements. This model is validated initially on experimental model. Then the work has focused on the behavior of a RC frame with 3 levels and three bays to better visualize the behavior of plastic hinges. Once the plastic hinge control parameters are identified (plastic rotation, ultimate curvature), a strengthening by introduction of reinforced concrete walls (RC/wall) at the ends of the reinforced concrete frame (RC/frame) has been performed. The results show that these RC walls significantly improve the behavior, by a relocation of efforts towards the central part of the beams.

关键词： RC/frame RC/wall moment curvature plastic rotation plastic hinge pushover analysis global models

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核电人因工程领域的发展

杨孟琢

《中国工程科学》 2002年第4卷第8期页码 12-19

摘要：

核电人因工程是核工程技术的一个组成部分，是研究人机交互作用，把人的特点引入核电工程设计，获得安全和高效的工艺设备与系统的新兴工程技术领域。结合我国走过的道路，重点论述了核电人因工程领域的形成、进展以及发展方向，同时也介绍了作者提出的人的可靠性的综合分类理论和其它研究成果。

关键词：核电人因工程控制室系统人的可靠性综合分类法

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碳基固体氧化物燃料电池理论模拟概述

李家玉,王宝轩,陈美娜,李昂,方秀荣,宋策,林子敬

《中国工程科学》 2013年第15卷第2期页码 39-49

摘要：

主要对碳基固体氧化物燃料电池（SOFC）中三传二反的控制方程、不同尺度的不同物理场理论模型以及碳基燃料的重整、催化和硫化等方面进行概括总结。SOFC有可使用氢气、一氧化碳、甲烷和其他的碳氢化合物作为燃料进行电化学反应的燃料灵活性，但使用碳氢燃料需要解决诸如碳基燃料的重整、电极的催化、积碳和硫化等问题。电池内部反应气体的物质输运、电荷输运、能量输运、动量输运和化学及电化学反应状态均可以用偏微分方程来描述。运用这些电化学反应和输运的偏微分方程，结合材料的微观性质，可以建立SOFC的多尺度多物理场模型。通过理论模型研究材料微结构与性质、工作条件、几何构型等参数对电池性能的影响，对SOFC材料组成与电池堆结构进行定量分析和优化设计，可以加速SOFC技术的更快发展。

关键词：多尺度模拟结构性能优化重整反应催化硫化

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Experimental study on flexural behavior of ECC/RC composite beams with U-shaped ECC permanent formwork

Zhi QIAO, Zuanfeng PAN, Weichen XUE, Shaoping MENG

《结构与土木工程前沿（英文）》 2019年第13卷第5期页码 1271-1287 doi: 10.1007/s11709-019-0556-0

摘要： To enhance the durability of a reinforced concrete structure, engineered cementitious composite (ECC), which exhibits high tensile ductility and good crack control ability, is considered a promising alternative to conventional concrete. However, broad application of ECC is hindered by its high cost. This paper presents a new means to address this issue by introducing a composite beam with a U-shaped ECC permanent formwork and infill concrete. The flexural performance of the ECC/RC composite beam has been investigated experimentally with eight specimens. According to the test results, the failure of a composite beam with a U-shaped ECC formwork is initiated by the crushing of compressive concrete rather than debonding, even if the surface between the ECC and the concrete is smooth as-finished. Under the same reinforcement configurations, ECC/RC composite beams exhibit increases in flexural performance in terms of ductility, load-carrying capacity, and damage tolerance compared with the counterpart ordinary RC beam. Furthermore, a theoretical model based on the strip method is proposed to predict the moment-curvature responses of ECC/RC composite beams, and a simplified method based on the equivalent rectangular stress distribution approach has also evolved. The theoretical results are found to be in good agreement with the test data.

关键词： engineered cementitious composite (ECC) durability ECC/RC composite beam permanent formwork flexural performance theoretical method

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接触冲刷发展过程模拟研究

陈建生,刘建刚,焦月红

《中国工程科学》 2003年第5卷第7期页码 33-39

摘要：砾石层和砂砾石层的渗透性决定，以细砂的起动速度为判别标准，通过分时段的稳定流计算，接触面附近的细砂从出渗口开始流出，出渗口附近的渗透系数首先增大，然后逐步向内部发展，以垂直河岸方向的发展最为迅速，甚至形成贯通性集中渗漏通道

关键词：接触冲刷起动速度流网集中渗漏通道

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Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with

《结构与土木工程前沿（英文）》 2022年第16卷第1期页码 131-143 doi: 10.1007/s11709-021-0787-8

摘要： This paper studied the effect of incorporation of carbon nanotubes (CNTs) in carbon fiber reinforced polymer (CFRP) on strengthening of reinforced concrete (RC) beams. The RC beams were prepared, strengthened in flexure by externally bonded CFRP or CNTs-modified CFRP sheets, and tested under four-point loading. The experimental results showed the ability of the CNTs to delay the initiation of the cracks and to enhance the flexural capacity of the beams strengthened with CFRP. A nonlinear finite element (FE) model was built, validated, and used to study the effect of various parameters on the strengthening efficiency of CNTs-modified CFRP. The studied parameters included concrete strength, flexural reinforcement ratio, and CFRP sheet configuration. The numerical results showed that utilization of CNTs in CFRP production improved the flexural capacity of the strengthened beams for U-shape and underside-strip configurations. The enhancement was more pronounced in the case of U-shape than in the case of use of sheet strip covers on the underside of the beam. In case of using underside-strip, the longer or the wider the sheet, the higher was the flexural capacity of the beams. The flexural enhancement of RC beams by strengthening with CNTs-modified CFRP decreased with increasing the rebar diameter and was not affected by concrete strength.

关键词： RC beams flexural strengthening CFRP CNTs finite element

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Investigation of the interior RC beam-column joints under monotonic antisymmetrical load

Fei GAO, Zhiqiang TANG, Biao HU, Junbo CHEN, Hongping ZHU, Jian MA

《结构与土木工程前沿（英文）》 2019年第13卷第6期页码 1474-1494 doi: 10.1007/s11709-019-0572-0

摘要： The paper presents numerical findings of reinforced concrete interior beam-column joints under monotonic antisymmetrical load. The finite element models considered compression and tension damage were calibrated by test results in terms of the load-displacement, failure modes, and strains of longitudinal steel. The emphasis was put on studying the effects of hoop reinforcement ratio in joint core and the axial compression ratio on the responses of the joints. The results show that, in addition to the truss and strut-and-tie mechanisms, the confinement mechanism also existed in the joint core. A certain amount of stirrup is not only able to enhance the confinement in joint core, undertake a part of shear force and thus to increase the shear capacity, prevent the outward buckling of steel bars in column, improve the stress distribution in joint core, delay cracking and restrain the propagation of cracks, but also to increase the yield load, decrease the yield displacement of beam and improve the joint ductility. However, excessive horizontal stirrups contribute little to the joint performance. In a certain range, larger axial compression ratio is beneficial for the joint mechanical behavior, while it is negative when axial compression ratio is too large.

关键词： RC beam-column joint reinforcement ratio in joint core axial compression ratio finite element test

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现代混凝土结构环境模拟试验室技术

李云峰,吴胜兴

《中国工程科学》 2005年第7卷第2期页码 81-85

摘要：

为了在试验室人工模拟环境下进行混凝土早期特性、裂缝控制及耐久性的试验，需对混凝土结构环境模拟试验室技术进行研究。分析了环境模拟技术在诸多领域的成功应用，认为建设混凝土环境试验室是可行的。通过研究混凝土结构的环境模拟、试验设计、耦合环境的实现以及特种设备仪器的应用等关键技术，提出大型多功能自动控制混凝土环境试验室的建设方案，合理确定试验室的布局、功能、技术性能指标，并探讨了人工气候环境试验室设备

关键词：凝土结构环境试验耐久性裂缝控制人工气候

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Modeling of Ce(IV) transport through a dispersion flat combined liquid membrane with carrier P507

Liang PEI,Liming WANG,Zhanying MA

《环境科学与工程前沿（英文）》 2014年第8卷第4期页码 503-509 doi: 10.1007/s11783-013-0540-1

摘要： A mathematical model for the transport of Ce(IV) from hydrochloric acid solutions through dispersion flat combined liquid membrane (DFCLM) with contain 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester (P507) as the carrier, dissolved in kerosene as the membrane solution have been studied. This process of facilitated transport, based on membrane technology, is a variation on the conventional technique of solvent extraction and may be described mathematically using Fick’s second law. The equations for transport velocity are derived considering the diffusion of P507 and its metallic complexes through the liquid membrane. In this work, the system is considered to be in a transient state, and chemical reaction between Ce(IV) and the carrier to take place only at the solvent–aqueous interfaces. Model concentration profiles are obtained for the Ce(IV), from which extraction velocities are predicted. The experimental and simulated Ce(IV) extractions showed similar tendencies for a high Ce(IV) concentration and acidity case.The model results indicate that high initial Ce(IV) concentrations and acidity both have detrimental effects on Ce(IV) extraction and stripping. The diffusion coefficient of Ce(IV) in the membrane and the thickness of diffusion layer between feed phase and membrane phase are obtained and the values are 6.31 × 10 m ·s and 31.2 μm, respectively. The results are in good agreement with experimental results.

关键词： Dispersion flat combined liquid membrane (DFCLM) dispersion phase feed phase 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester Ce (IV)