资源类型

期刊论文 91

年份

2022 9

2021 7

2020 3

2019 5

2018 3

2016 2

2015 2

2014 2

2013 2

2012 13

2011 10

2010 9

2009 5

2008 2

2007 4

2006 1

2005 2

2004 3

2003 3

2002 1

展开 ︾

关键词

水库 4

三峡工程 3

裂缝 3

三峡库区 2

人工智能 2

低渗透 2

储层 2

储层预测 2

压裂 2

普光气田 2

水平井 2

油气勘探 2

CAN总线 1

Lipschitz非线性系统；动态输出反馈控制；事件触发控制；全局渐近稳定 1

Pareto 优于关系 1

Pareto 强度值 1

SCE-UA算法 1

copula 1

一致性；自触发控制；分布式模型预测控制 1

展开 ︾

检索范围：

排序： 展示方式：

Features of seismic hazard in large dam projects and strong motion monitoring of large dams

Martin WIELAND,

《结构与土木工程前沿（英文）》 2010年 第4卷 第1期   页码 56-64 doi: 10.1007/s11709-010-0005-6

摘要： Earthquakes can affect large dam projects in many different ways. Usually, design engineers are focussing on ground shaking and neglect the other aspects. The May 12, 2008 Wenchuan earthquake has damaged 1803 dams and reservoirs, and 403 hydropower plants with an installed capacity of 3.3GW. Among these dams were the 132-m-high Shapai RCC arch dam and the 156-m-high Zipingpu concrete face rockfill dam. These recently completed dams are dam types which, up to now, have not experienced strong ground shaking. The widespread mass movements have caused substantial damage to dams and surface powerhouses in Sichuan. The different features of earthquake hazard are presented, i.e., ground shaking, faulting and mass movements. It is proposed to prepare project-specific safety plans for all dams, which consist of a matrix where the possible hazards and the corresponding countermeasures are listed. The earthquake behaviors of the Sefid Rud, Zipingpu and Shapai dams, which, in the past, have experienced strong ground shaking from nearby earthquakes, are discussed. Finally, the need for strong motion instrumentation of large dams is discussed. It is proposed that major dams with large damage potential, dams located in areas of high seismicity, and dams showing signs of abnormal behavior be equipped with strong motion instruments.

关键词： seismic hazard     arch dam     concrete face rockfill dam     strong motion instrumentation     reservoir-triggered seismicity     Wenchuan earthquake    

HTML PDF 收藏

Porous ultrathin-shell microcapsules designed by microfluidics for selective permeation and stimuli-triggered

《化学科学与工程前沿（英文）》   页码 1643-1650 doi: 10.1007/s11705-022-2201-z

摘要： Microcapsules are versatile delivery vehicles and widely used in various areas. Generally, microcapsules with solid shells lack selective permeation and only exhibit a simple release mode. Here, we use ultrathin-shell water-in-oil-in-water double emulsions as templates and design porous ultrathin-shell microcapsules for selective permeation and multiple stimuli-triggered release. After preparation of double emulsions by microfluidic devices, negatively charged shellac nanoparticles dispersed in the inner water core electrostatically complex with positively charged telechelic α,ω-diamino functionalized polydimethylsiloxane polymers dissolved in the middle oil shell at the water/oil interface, thus forming a porous shell of shellac nanoparticles cross-linked by telechelic polymers. Subsequently, the double emulsions become porous microcapsules upon evaporation of the middle oil phase. The porous ultrathin-shell microcapsules exhibit excellent properties, including tunable size, selective permeation and stimuli-triggered release. Small molecules or particles can diffuse across the shell, while large molecules or particles are encapsulated in the core, and release of the encapsulated cargos can be triggered by osmotic shock or a pH change. Due to their unique performance, porous ultrathin-shell microcapsules present promising platforms for various applications, such as drug delivery.

关键词： microcapsule     emulsion     microfluidics     selective permeation     stimuli-triggered release    

HTML PDF 收藏

Chemically triggered life control of “smart” hydrogels through click and declick reactions

《化学科学与工程前沿（英文）》 2022年 第16卷 第9期   页码 1399-1406 doi: 10.1007/s11705-022-2149-z

摘要： The degradation of polymeric materials is recognized as one of the goals to be fulfilled for the sustainable economy. In this study, a novel methodology was presented to synthesize multiple highly cross-linked polymers (i.e., hydrogels) through amine–thiol scrambling under mild conditions. Amine-terminated poly(ethylene glycol) (PEG-NH2) was reacted with the representative conjugate acceptors to synthesize hydrogels in organic and aqueous solutions, respectively. The materials above exhibited high water-swelling properties, distributed porous structures, as well as prominent mechanical strengths. It is noteworthy that the mentioned hydrogels could be degraded efficiently in hours to release the original coupling partner, which were induced by ethylene diamine at ambient temperature through amine-amine metathesis. The recovered PEG-NH2 reagent could be employed again to regenerate hydrogels. Due to the multiple architectures and functions in polymeric synthesis, degradation and regeneration, a new generation of “smart” materials is revealed.

关键词： hydrogels     degradation     synthesis     regeneration    

HTML PDF 收藏

Immune response triggered by the ablation of hepatocellular carcinoma with nanosecond pulsed electric

Jianpeng Liu, Xinhua Chen, Shusen Zheng

《医学前沿（英文）》 2021年 第15卷 第2期   页码 170-177 doi: 10.1007/s11684-020-0747-z

摘要： Nanosecond pulsed electric field (nsPEF) is a novel, nonthermal, and minimally invasive modality that can ablate solid tumors by inducing apoptosis. Recent animal experiments show that nsPEF can induce the immunogenic cell death of hepatocellular carcinoma (HCC) and stimulate the host’s immune response to kill residual tumor cells and decrease distant metastatic tumors. nsPEF-induced immunity is of great clinical importance because the nonthermal ablation may enhance the immune memory, which can prevent HCC recurrence and metastasis. This review summarized the most advanced research on the effect of nsPEF. The possible mechanisms of how locoregional nsPEF ablation enhances the systemic anticancer immune responses were illustrated. nsPEF stimulates the host immune system to boost stimulation and prevail suppression. Also, nsPEF increases the dendritic cell loading and inhibits the regulatory responses, thereby improving immune stimulation and limiting immunosuppression in HCC-bearing hosts. Therefore, nsPEF has excellent potential for HCC treatment.

关键词： nanosecond pulsed electric fields (nsPEF)     hepatocellular carcinoma (HCC)     immune response     recurrence     metastasis    

HTML PDF 收藏

一类Lipschitz非线性系统的事件触发动态输出反馈控制 Research Article

刘智倩,楼旭阳,贾佳佳

《信息与电子工程前沿（英文）》 2022年 第23卷 第11期   页码 1684-1699 doi: 10.1631/FITEE.2100552

摘要：

本文研究一类Lipschitz非线性系统的动态输出反馈控制问题。首先，针对该系统设计了一个连续时间控制器，并且给出了系统稳定的充分条件。其次，针对该Lipschitz非线性系统提出一种新的事件触发机制，在该触发机制中引入了新的事件触发条件，并构建了事件触发控制下的闭环混杂系统。在混杂系统框架下建立了闭环系统稳定的充分条件。此外，给出了最小事件间隔的上界，以避免Zeno现象。最后，通过在神经网络系统和基因调控网络系统中的数值仿真验证了理论结果及所提方法的优越性。

关键词： Lipschitz非线性系统；动态输出反馈控制；事件触发控制；全局渐近稳定    

HTML PDF 收藏

中国火山岩油气藏控制因素及分布规律

侯连华,朱如凯,赵霞,庞正炼,罗霞,毛治国

《中国工程科学》 2012年 第14卷 第6期   页码 77-86

摘要：

中国沉积盆地内主要发育石炭—二叠系、侏罗—白垩系和古近—新近系3套火山岩，火山岩大面积分布，烃源岩与火山岩伴生，形成良好的生储盖组合。东部盆地以中酸性岩为主，主要发育原生型火山岩储层；西部盆地以中基性岩为主，主要发育风化壳型储层，火山岩风化壳储层物性好于原生型储层物性，各种岩性、岩相均能形成有效储层。东部盆地主要发育岩性、断层—岩性油气藏；西部盆地主要发育地层型、构造—地层型、构造—岩性—地层复合型油气藏。松辽盆地深层持续沉降型断陷控制天然气区域分布，生烃断槽控制断陷内天然气分布，近邻生烃断槽的断裂构造带是天然气富集区带，优质火山岩储层控制天然气富集；新疆北部石炭系残留生烃凹陷控制油气平面分布，风化壳规模控制油气富集程度和规模，风化壳地层型有效圈闭控制油气成藏，正向构造背景控制油气运聚。指出中国火山岩有利勘探面积36万km2，预测火山岩中总资源量60亿t油当量以上，勘探潜力大。

关键词： 火山岩储层     火成岩油气藏     成藏控制因素     油气藏分布规律    

HTML PDF 收藏

On the seismic stability analysis of reinforced rock slope and optimization of prestressed cables

Wenbo ZHENG, Xiaoying ZHUANG, Yongchang CAI

《结构与土木工程前沿（英文）》 2012年 第6卷 第2期   页码 132-146 doi: 10.1007/s11709-012-0152-z

摘要： The evaluation of the seismic stability of high rock slopes is of vital importance to ensure the safe operation of the hydropower stations. In this paper, an equivalent pseudo-static force analysis based on the finite element method is developed to evaluate the seismic stability of reinforced rock slopes where the prestressed cables are modeled by the bar elements applied with nodal forces and bounded only at the anchored parts. The method is applied to analyze a high rock slope in south-west China and the optimization of cables. The stabilization effects of prestressed cables on the seismic stability of the slope are studied, the simulations of the concrete heading are discussed and the potential failure modes of the shear concrete plug are compared. Based on this, the optimization of cables is studied including the anchor spacing and inclined angles.

关键词： high rock slope     reinforced system     optimization     prestressed cable     seismicity    

HTML PDF 收藏

CAN总线时间触发机制的实现

吕伟杰,,刘鲁源,王毅新

《中国工程科学》 2005年 第7卷 第9期   页码 40-43

摘要：

分析了CAN总线的时间触发机制，基于8052单片机和CAN控制器SJA1000设计了时间触发机制的实现方案，给出了网络中基本周期中可传输的最大消息数目及可调度分析方法。以汽车引擎控制系统为例进行的实验结果表明，利用CAN总线时间触发机制不仅可以有效地管理消息的传输，而且提高了总线带宽利用率。

关键词： 时间触发     时间同步     CAN总线     分布式控制系统    

HTML PDF 收藏

长江三峡库区水库诱发地震的研究

李砰,李愿军,杨美娥

《中国工程科学》 2005年 第7卷 第6期   页码 14-20

摘要：

中国长江三峡工程于2003年6月1日正式下闸蓄水，6月7日起突然在湖北省巴东县城北信陵镇沿江一线发生了2000多次密集的小震群，引起了大家的严重关切，在未来的几年内随着二期和三期工程的完工，水位将提高到156m和175m，是否会诱发更大更强的地震？根据地震构造的观点分析了库区东段几条活动断裂的分布、交汇关系和孕震能力，认为巴东和秭归可能为两个潜在震源区，蓄水后有引发5.5级左右的地震可能，地震烈度可达VII°～VIII°；并可能诱发库区内众多滑坡体的复活，导致严重的地质灾害。

关键词： 长江三峡水库     水库诱发地震     地质灾害    

HTML PDF 收藏

Evaluation of seismic reliability of gravity dam-reservoir-inhomogeneous foundation coupled system

Hamid Taghavi GANJI, Mohammad ALEMBAGHERI, Mohammad Houshmand KHANEGHAHI

《结构与土木工程前沿（英文）》 2019年 第13卷 第3期   页码 701-715 doi: 10.1007/s11709-018-0507-1

摘要： The seismic performance of gravity dam-reservoir-foundation coupled system is investigated utilizing probabilistic approach. In this research, the uncertainties associated with modeling parameters are incorporated in nonlinear response history simulations to realistically quantify their effects on the seismic performance of the system. The methodology is applied to Pine Flat gravity dam and the foundation is considered to be inhomogeneous assuming a constant spatial geometry but with various rock material properties. The sources of uncertainty are taken into account in the reliability analysis using Latin Hypercube Sampling procedure. The effects of the deconvolution process, number of samples, and foundation inhomogeneity are investigated.

关键词： gravity dams     dam-reservoir-foundation interaction     seismic reliability     inhomogeneous foundation     earthquake deconvolution    

HTML PDF 收藏

In-plane transversal normal stresses in the concrete face of CFRD induced by the first-dam reservoir

Neftalí SARMIENTO-SOLANO, Miguel P. ROMO

《结构与土木工程前沿（英文）》 2018年 第12卷 第1期   页码 81-91 doi: 10.1007/s11709-016-0378-2

摘要： To evaluate the effects of dam height, valley narrowness and width of concrete slabs on the first-dam reservoir filling in-plane transversal normal stresses in the concrete face of CFRD´s, 3D finite difference analyses were carried out. Behavior of rockfill dams considered in this study was defined from the monitoring of a number of 3D sets of pressure cells and extensometers installed in three large dams in Mexico. The 3D analyses results show that high in-plane transversal compressive stresses develop within the concrete panels located in the central concrete face zone upon dam reservoir filling loading. Likewise, in-plane induced tensile transversal stresses in the zones near the abutments increase the potential of slabs cracking and damaging the waterstops in-between the vertical and perimetral joints. From the results of the 3D finite difference analyses, a simple method to estimate in-plane normal stresses in the concrete face is advanced and through comparisons with the results of a 3D case numerical study, its accuracy assessed.

关键词： concrete face     CFR dams     reservoir filling     slab in-plane stresses    

HTML PDF 收藏

Spatio-temporal variations of water quality in Yuqiao Reservoir Basin, North China

Yuan XU,Ruqin XIE,Yuqiu WANG,Jian SHA

《环境科学与工程前沿（英文）》 2015年 第9卷 第4期   页码 649-664 doi: 10.1007/s11783-014-0702-9

摘要： Fuzzy comprehensive assessment and multivariate statistical techniques including cluster analysis, discriminant analysis, principal component analysis, and factor analysis were applied to analyze the water quality status of Yuqiao Reservoir Basin, North China, for assessing its spatio-temporal variations and identifying potential pollution sources. In this paper, we considered data for 14 water quality parameters collected during 1990–2004 at 7 water quality monitoring sites. The results of fuzzy comprehensive assessment revealed that water quality in Yuqiao Reservoir Basin showed a downtrend from 1990 to 2001 with fluctuation, and a slowly upward trend after 2001. The major water quality belonged to Class III and IV. Besides, hierarchical cluster analysis divided 7 monitoring sites into two groups (Group A and B), and 12 months into three periods (low-flow (LF), normal-flow (NF), and high-flow (HF) period). Temp, pH, SS, T-har, DO, NO -N and TP were identified as significant variables affecting spatial variations, and Temp, pH and NO -N were identified as significant variables affecting temporal variations by discriminant analysis. Factor analysis identified four latent pollution sources for water quality variations: nutrient pollution, organic pollution, inorganic pollution, and natural pollution. Moreover, for Group A regions, pollution inputs mainly came from domestic wastewater and industrial sewage. For Group B regions, it is more likely that water pollution resulted from the combined effects of domestic wastewater, hospital wastewater, agriculture runoff, and fishpond discharge, as well as the incoming water from upstream.

关键词： Fuzzy comprehensive assessment     multivariate statistical analysis     water quality    

HTML PDF 收藏

无线传感网络环境下基于信息新鲜度约束的事件触发卡尔曼一致性滤波算法 Research Articles

王蕊1,李雅辉1,孙辉1,张友民2

《信息与电子工程前沿（英文）》 2021年 第22卷 第1期   页码 1-140 doi: 10.1631/FITEE.2000206

摘要： 提出一种新的基于无线传感网络的事件触发卡尔曼一致性滤波（ET-KCF）算法。该算法基于信息新鲜度，通过计算采样信息的信息年龄（age of information，AoI）度量信息的新鲜度。该算法集成传统的事件触发机制、信息新鲜度计算方法和卡尔曼一致性滤波（KCF）算法，可以更有效地估计飞机舱内的污染物浓度。该方法还考虑了数据包丢失和通信路径丢失对信息传输的影响，提出一种基于AoI约束的ET-KCF阈值选择方法，将每个数据包的AoI与系统最小平均AoI比较。该方法减少了对过期信息的传输，大大降低了网络能耗。最后，利用李雅普诺夫稳定性理论和矩阵理论证明了算法的收敛性。仿真结果表明，与现有KCF算法相比，该算法具有更好的容错性，与其他ET-KCF算法相比，其功耗更低。

关键词： 分布式卡尔曼一致性滤波；事件触发机制；信息年龄（AoI）；稳定性分析；能量优化    

HTML PDF 收藏

Improved “cure on demand” of aromatic bismaleimide with thiol triggered by retro-Diels-Alder reaction

Vincent Froidevaux, Mélanie Decostanzi, Abdelatif Manseri, Sylvain Caillol, Bernard Boutevin, Rémi Auvergne

《化学科学与工程前沿（英文）》 2021年 第15卷 第2期   页码 330-339 doi: 10.1007/s11705-020-1929-6

摘要： This study focuses on the synthesis of new liquid aromatic bismaleimide monomers in order to improve self-curing on demand (SCOD) systems previously based on aliphatic bismaleimides. These SCOD systems are based on Diels-Alder (DA)/retro-DA reactions. The syntheses of new different aromatic bismaleimides with ester and amide bonds are presented. These maleimides have been protected using DA reaction and characterized by H NMR analysis to determine protection rate and diastereomer ratios. The retro-DA reactions of both aromatic and aliphatic DA adducts in presence of thiol molecules were studied. Kinetic analysis was monitored by H NMR and compared to model study. Finally, both aromatic and aliphatic bismaleimides-based polymers were synthesized with 2-mercaptoethyl ether and thermal properties of polymers were compared. The glass transition temperature values ranged from –20 °C to 14 °C and very good thermal stabilities were observed (up to 300 °C).

关键词： thiol-ene polymerization     self-curing on demand     thia-michael addition     Diels-Alder     maleimide    

HTML PDF 收藏

Al-NaOH复合液态金属——一种具有热和气动特性且快速响应的水触发材料 Article

袁博, 孙旭阳, 刘静

《工程（英文）》 2020年 第6卷 第12期   页码 1454-1462 doi: 10.1016/j.eng.2019.08.020

摘要：

水触发材料因其操作简单、驱动柔和、成本低廉、环境友好等诸多优点受到越来越多的关注。但是，大多数此类材料通常具有较长的反应时间，并且需要严格的保存条件，这限制了它们在实践中的适应性。本研究提出并证明了一种基于Al-NaOH复合共晶镓-铟（eGaIn）合金的新型水触发材料，该材料具有快速响应性和可变形性。一旦加入水，制成的材料将在短短几秒钟内随着气体的产生而升温40 ℃，这表明它具有用作热驱动器和气动驱动器的巨大潜力。此外，研究还测试了新材料的可重复使用性和降解能力。并据此设计了双层结构的智能绷带，其内部填充了Al-NaOH复合eGaIn，而BiInSn则作为外部支撑材料。实验显示，厚度为2 mm的片状结构经过冷却处理后能够支撑1.8 kg的重物，这比常用的玻璃纤维高分子绷带的承重能力要好得多。同时，研究还使用Al-NaOH复合eGaIn制作了水触发球形机器人的原型，该原型在特定的外部刺激下实现了滚动和弹跳行为。这些发现表明，当前材料在开发未来的可穿戴设备、软驱动器和软机器人方面具有潜在价值。

关键词： 液体金属     水触发材料     自热材料     软驱动器    

HTML PDF 收藏

标题 作者 时间 类型 操作

Features of seismic hazard in large dam projects and strong motion monitoring of large dams

Martin WIELAND,

期刊论文

Porous ultrathin-shell microcapsules designed by microfluidics for selective permeation and stimuli-triggered

期刊论文

Chemically triggered life control of “smart” hydrogels through click and declick reactions

期刊论文

Immune response triggered by the ablation of hepatocellular carcinoma with nanosecond pulsed electric

Jianpeng Liu, Xinhua Chen, Shusen Zheng

期刊论文

一类Lipschitz非线性系统的事件触发动态输出反馈控制

刘智倩,楼旭阳,贾佳佳

期刊论文

中国火山岩油气藏控制因素及分布规律

侯连华,朱如凯,赵霞,庞正炼,罗霞,毛治国

期刊论文

On the seismic stability analysis of reinforced rock slope and optimization of prestressed cables

Wenbo ZHENG, Xiaoying ZHUANG, Yongchang CAI

期刊论文

CAN总线时间触发机制的实现

吕伟杰,,刘鲁源,王毅新

期刊论文

长江三峡库区水库诱发地震的研究

李砰,李愿军,杨美娥

期刊论文

Evaluation of seismic reliability of gravity dam-reservoir-inhomogeneous foundation coupled system

Hamid Taghavi GANJI, Mohammad ALEMBAGHERI, Mohammad Houshmand KHANEGHAHI

期刊论文

In-plane transversal normal stresses in the concrete face of CFRD induced by the first-dam reservoir

Neftalí SARMIENTO-SOLANO, Miguel P. ROMO

期刊论文

Spatio-temporal variations of water quality in Yuqiao Reservoir Basin, North China

Yuan XU,Ruqin XIE,Yuqiu WANG,Jian SHA

期刊论文

无线传感网络环境下基于信息新鲜度约束的事件触发卡尔曼一致性滤波算法

王蕊1,李雅辉1,孙辉1,张友民2

期刊论文

Improved “cure on demand” of aromatic bismaleimide with thiol triggered by retro-Diels-Alder reaction

Vincent Froidevaux, Mélanie Decostanzi, Abdelatif Manseri, Sylvain Caillol, Bernard Boutevin, Rémi Auvergne

期刊论文

Al-NaOH复合液态金属——一种具有热和气动特性且快速响应的水触发材料

袁博, 孙旭阳, 刘静

期刊论文