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Development and advances in modular multilevel converter based HVDC projects in China

《工程管理前沿（英文）》页码 183-189 doi: 10.1007/s42524-022-0248-7

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关键词： high voltage direct current power converter power systems renewable energy ultra-high voltage

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Behavior and strength of headed stud shear connectors in ultra-high performance concrete of composite

Jianan QI, Yuqing HU, Jingquan WANG, Wenchao LI

《结构与土木工程前沿（英文）》 2019年第13卷第5期页码 1138-1149 doi: 10.1007/s11709-019-0542-6

摘要： This study presents an experimental and numerical investigation on the static behavior of headed stud shear connectors in ultra-high performance concrete (UHPC) of composite bridges. Four push-out specimens were tested. It was found that no cracking, crushing or splitting was observed on the concrete slab, indicating that UHPC slab exhibited good performance and could resist the high force transferred from the headed studs. The numerical and experimental results indicated that the shear capacity is supposed to be composed of two parts stud shank shear contribution and concrete wedge block shear contribution. The stiffness increment of a stud in UHPC was at least 60% higher than that in normal strength concrete. Even if the stud height was reduced from 6 to 2 , there was no reduction in the shear strength of a stud. Short stud shear connectors with an aspect ratio as small as 2 could develop full strength in UHPC slabs. An empirical load-slip equation taking into account stud diameter was proposed to predict the load-slip response of a stud. The reliability and accuracy of the proposed load-slip equation was verified by the experimental and numerical load-slip curves.

关键词： ultra-high performance concrete studs shear strength FE analysis push-out test

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300m 级特高拱坝建设关键技术与实践

王仁坤

《工程（英文）》 2016年第2卷第3期页码 350-359 doi: 10.1016/J.ENG.2016.03.012

摘要：

中国于2000 年成功建设二滩拱坝( 高240 m）以来，至2014 年年底已建成7 座坝高超过200 m 的特高拱坝，其中锦屏一级拱坝（高305 m）、小湾拱坝（高294.5 m）、溪洛渡拱坝（高285.5 m）不仅坝高达300 m 级，而且因地质条件复杂，水推力巨大，抗震要求高，在安全控制技术等方面取得了新的突破。本文主要阐述300 m 级特高拱坝的基础可利用岩体及合理建基面、体形优化设计、安全设计准则、抗震研究与抗震措施、复杂地基的典型处理、混凝土及施工期温控防裂等关键技术。

关键词：特高拱坝优化设计整体安全抗震安全混凝土温控

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超高性能混凝土钢纤维-基体界面黏结性能研究综述 Review

邓毓琳, 张祖华, 史才军, 吴泽媚, 张超慧

《工程（英文）》 2023年第22卷第3期页码 215-232 doi: 10.1016/j.eng.2021.11.019

摘要：

超高性能混凝土（UHPC）是一种相对较新的水泥混凝土复合材料，由于其优异的机械强度和耐久性，在基础设施建设中具有巨大的应用潜力。钢纤维与基体的界面黏结性能是决定UHPC其他力学性能的主要因素，包括抗拉、抗折、抗压强度和破坏模式（断裂行为）。本文通过讨论并比较多种纤维拉拔测试方法和分析模型，全面综述了UHPC的纤维-基体黏结行为的研究进展；详细确定并讨论了影响纤维-基体黏结的参数，包括纤维的几何形状和方向、表面处理、基体的组成和强度。最后，基于现有研究，对未来UHPC增强方法和测试细节提出了建议。

关键词：超高性能混凝土界面黏结钢纤维拉拔行为

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One-step synthesis of structurally stable CO2-philic membranes with ultra-high PEO loading for enhanced

Bin Zhu,Shanshan He,Yadong Wu,Songwei Li,Lu Shao,

《工程（英文）》 doi: 10.1016/j.eng.2022.03.016

摘要： Membrane technology has been considered a promising strategy for carbon capture to mitigate the effects of increasing atmospheric CO2 levels because CO2-philic membranes have demonstrated significant application potential, especially, for CO2/light gas separation. In this regard, poly(ethylene oxide) (PEO), which is a representative CO2-philic material, has attracted extensive research attention owing to its specific dipole–quadrupole interaction with CO2. Herein, we report a facile one-step synthesis protocol via the in situ polymerization of highly flexible polyethylene glycol to overcome the limitations of PEO, including high crystallinity and poor mechanical strength. The robust structure derived from intricate entanglements between short PEO chains and the polymer matrix enables an extremely high loading of linear polyethylene glycol (up to 90 wt%). Consequently, the separation performance easily surpasses the upper-bound limit. Moreover, the high structural stability allows for the concurrent increase of CO2 permeability and CO2/light gas selectivity at high feed pressure (up to 20 bar). This study provides a promising strategy to simultaneously improve the toughness and gas separation properties of all-polymeric membranes, demonstrating significant potential for industrial carbon capture and gas purification.

关键词： Membrane separation Gas separation CO 2 capture CO 2 -philic membrane Poly(ethylene oxide)

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探索新强韧化机制开拓超高强度钢新领域

赵振业,李志,刘天琦,朱杰远

《中国工程科学》 2003年第5卷第9期页码 39-42

摘要：

论述了超细化马氏体板条，共格沉淀新强化相（Laves相），M₂C碳化物和残余—逆转变奥氏体向马氏体相变诱发塑性等强韧化机理，用超纯洁熔炼、超均匀化及控制相变等工艺，获得一种低碳-14Cr-12Co-5Mo-Me新型超高强度、高塑性、高韧性不锈钢。

关键词：超高强度不锈钢马氏体板条强韧化机理

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一种超高强度钢构件抗疲劳实验研究

赵振业,宋德玉,李向斌,杨树勋,马新闻

《中国工程科学》 2005年第7卷第10期页码 51-55

摘要：

提出了超高强度钢“无应力集中”抗疲劳概念。喷丸、孔挤压、螺纹滚压等表面层组织再造改性造成的残余压应力和高位错密度胞状结构将裂纹推移至亚表面萌生并阻滞其扩展，回复不同应力集中处的疲劳强度至接近钢的固有疲劳强度，形成“无应力集中”表面完整性状态。“无应力集中”抗疲劳概念表述为构件表面形成完整的接近于钢固有疲劳强度的等疲劳强度包络。

关键词：超高强度钢抗疲劳应力集中表面完整性

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PD pattern recognition based on multi-fractal dimension in GIS

ZHANG Xiaoxing, YAO Yao, TANG Ju, ZHOU Qian, XU Zhongrong

《机械工程前沿（英文）》 2008年第3卷第3期页码 270-275 doi: 10.1007/s11465-008-0042-1

摘要： This paper designs four types of gas insulated substation (GIS) defect models based on partial discharge (PD) characteristics and its defections. The GIS gray intensity images are constructed based on the mass specimens gathered by the ultra-high frequency and high-speed sampling systems. The multi-fractal dimension is founded on the box-counting dimension and multi-fractal theories. The GIS gray intensity images distillation methods, based on multi-fractal characteristics, is put forward. The box-counting dimension, multi-fractal dimension, and discharge centrobaric characteristics of the PD images are also extracted. The characteristic variables are then classified by the radial basis function (RBF) network. Identified results show that the methods can effectively elevate the discrimination of the four types of defects in GIS.

关键词： substation high-speed discharge centrobaric network ultra-high frequency

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水射流技术在石油工程中的应用及前景展望

沈忠厚,李根生,王瑞和

《中国工程科学》 2002年第4卷第12期页码 60-65

摘要：

论述了水射流技术在我国石油工程中的研究和应用情况。应用实验方法建立了淹没非自由射流压力及水功率衰减计算模型，建立了以井底获得最大水功率，优选水力参数设计的新方法和新模型。应用瞬态流理论及水声学原理建立了两种谐振腔的基本关系式和结构数学模型。建立了在钻井双向应力作用下，岩石裂纹发展方向模型。介绍了研制的3种新型高效钻头，即加长喷嘴牙轮钻头、自振射流钻头和射流及机械联合破岩钻头。展望了水射流技术在超高压射流钻井、稠油及低渗油藏开采、提高采收率等方面的应用前景。

关键词：水射流技术石油钻井油气开采高压和超高压射流

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特高压输电工程（英文）

2022年12月10日

关键词： 2021全球十大工程成就

Piezoresistive pressure sensor with high sensitivity for medical application using peninsula-island structure

Tingzhong XU, Hongyan WANG, Yong XIA, Zhiming ZHAO, Mimi HUANG, Jiuhong WANG, Libo ZHAO, Yulong ZHAO, Zhuangde JIANG

《机械工程前沿（英文）》 2017年第12卷第4期页码 546-553 doi: 10.1007/s11465-017-0447-9

摘要：

A novel micro-electromechanical systems piezoresistive pressure sensor with a diagonally positioned peninsula-island structure has high sensitivity for ultra-low-pressure measurement. The pressure sensor was designed with a working range of 0–500 Pa and had a high sensitivity of 0.06 mV·V⁻¹·Pa⁻¹. The trade-off between high sensitivity and linearity was alleviated. Moreover, the influence of the installation angle on the sensing chip output was analyzed, and an application experiment of the sensor was conducted using the built pipettor test platform. Findings indicated that the proposed pressure sensor had sufficient resolution ability and accuracy to detect the pressure variation in the pipettor chamber. Therefore, the proposed pressure sensor has strong potential for medical equipment application.

关键词： MEMS low pressure sensor peninsula-island ultra-high sensitivity medical application

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特高压输电工程（中文）

2022年12月07日

关键词： 2021全球十大工程成就

Recent advances toward high voltage, EC-free electrolytes for graphite-based Li-ion battery

Tong Zhang, Elie Paillard

《化学科学与工程前沿（英文）》 2018年第12卷第3期页码 577-591 doi: 10.1007/s11705-018-1758-z

摘要：

Lithium-ion batteries are a key technology in today’s world and improving their performances requires, in many cases, the use of cathodes operating above the anodic stability of state-of-the-art electrolytes based on ethylene carbonate (EC) mixtures. EC, however, is a crucial component of electrolytes, due to its excellent ability to allow graphite anode operation–also required for high energy density batteries–by stabilizing the electrode/electrolyte interface. In the last years, many alternative electrolytes, aiming at allowing high voltage battery operation, have been proposed. However, often, graphite electrode operation is not well demonstrated in these electrolytes. Thus, we review here the high voltage, EC-free alternative electrolytes, focusing on those allowing the steady operation of graphite anodes. This review covers electrolyte compositions, with the widespread use of additives, the change in main lithium salt, the effect of anion (or Li salt) concentration, but also reports on graphite protection strategies, by coatings or artificial solid electrolyte interphase (SEI) or by use of water-soluble binder for electrode processing as these can also enable the use of graphite in electrolytes with suboptimal intrinsic SEI formation ability.

关键词： lithium-ion electrolyte solid electrolyte interphase additives high voltage graphite

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Parameter identification of interconnected power system frequency after trip-out of high voltage transmission

Xuzhan ZHOU,Shanshan LIU,Mingkun WANG,Yiping DAI,Yaohua TANG

《能源前沿（英文）》 2014年第8卷第3期页码 386-393 doi: 10.1007/s11708-014-0323-9

摘要： Accurate modeling and parameters of high voltage (HV) grid are critical for stability research of system frequency. In this paper, simulation modeling of the system frequency was conducted of an interconnected power system with HV transmission lines in China. Based on recorded tripping data of the HV transmission lines, system parameters were identified by using genetic algorithm (GA). The favorable agreement between simulation results and recorded data verifies the validity of gird models and the accuracy of system parameters. The results of this paper can provide reference for the stability research of HV power grid.

关键词： high voltage (HV) grid frequency stability parameter identification primary frequency regulation (PFR)

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我国数字创意技术的发展现状与展望

邓磊,王妙辉,范雷东,袁圆,王振中

《中国工程科学》 2020年第22卷第2期页码 63-70 doi: 10.15302/J-SSCAE-2020.02.009

摘要：

数字创意产业作为国家“十三五”规划确定的战略性新兴产业之一，以全球数字化和网络化为背景，以文化创意、内容生产、版权利用为发展核心，通过融合渗透带动周边产业集群的发展。相关产业发展壮大的基础性支撑在于数字创意技术与创新设计，而这又是我国产业发展的薄弱环节，且面临未来发展路径的缺失状态。本文结合产业数据调研结果，系统梳理了我国数字创意技术中的使能技术、应用技术和终端设备技术的发展现状，总结了超高清视频、三维声、虚拟现实 / 增强现实（VR/AR）、数字内容生产和创新设计软件等具体方向存在的问题与短板。研究表明，设立数字创意技术国家科技重大专项，建设数字创意技术国家工程研究中心，提高数字创意技术人才培养质量，积极参与国际合作并扩大中国文化的影响力，将有力推动我国数字创意技术的中长期发展。

关键词：数字创意文化创意创新设计超高清视频虚拟现实