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Seismic behavior of cantilever wall embedded in dry and saturated sand

Sanku KONAI, Aniruddha SENGUPTA, Kousik DEB

《结构与土木工程前沿（英文）》 2020年第14卷第3期页码 690-705 doi: 10.1007/s11709-020-0615-6

摘要： The embedded cantilever retaining walls are often required for excavation to construct the underground facilities. Significant numbers of numerical and experimental studies have been performed to understand the behavior of embedded cantilever retaining walls under static condition. However, very limited studies have been conducted on the behavior of embedded retaining walls under seismic condition. In this paper, the behavior of a small scale model embedded cantilever retaining wall in dry and saturated sand under seismic loading condition is investigated by shake table tests in the laboratory and numerically using software FLAC2D. The embedded cantilever walls are subjected to sinusoidal dynamic motions. The behaviors of the cantilever walls in terms of lateral displacement and bending moment are studied with the variation of the two important design parameters, peak amplitude of the base motions and excavation depth. The variation of the pore water pressures within the sand is also observed in the cases of saturated sand. The maximum lateral displacement of a cantilever wall due to seismic loading is below 1% of the total height of the wall in dry sand, but in case of saturated sand, it can go up to 12.75% of the total height of the wall.

关键词： embedded cantilever wall shake table test FLAC2D seismic loading saturated and dry sand

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Torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic half-space

Dazhi WU,Lu YU

《结构与土木工程前沿（英文）》 2015年第9卷第2期页码 194-202 doi: 10.1007/s11709-015-0292-z

摘要： Considering the interactions between an embedded foundation and saturated soil, the torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic medium are analyzed in this paper. Both a rigid foundation and an elastic foundation are considered. Assuming both the side surface and the bottom surface of the foundation are perfectly bonded to soil, the reaction torques that the side soil and bottom soil acting on the foundation can be gained from basic dynamic equations of the poroelastic medium. According to the dynamic equilibrium equations of a foundation under harmonic torque, the torsional vibrations of an embedded cylindrical foundation are presented. Besides, the angular amplitude of the foundation, the equivalent stiffness and damping coefficients of the soil are expressed explicitly. Selected examples are presented to investigate the influence of relevant parameters on the torsional vibrations.

关键词： embedded foundation saturated soil rigid foundation elastic foundation torsional vibration

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Shear strength model of the reinforced concrete beams with embedded through-section strengthening bars

Linh Van Hong BUI; Phuoc Trong NGUYEN

《结构与土木工程前沿（英文）》 2022年第16卷第7期页码 843-857 doi: 10.1007/s11709-022-0834-0

摘要： In this study, finite element (FE) analysis is utilized to investigate the shear capacity of reinforced concrete (RC) beams strengthened with embedded through-section (ETS) bars. Effects of critical variables on the beam shear strength, including the compressive strength of concrete, stiffness ratio between ETS bars and steel stirrups, and use of ETS strengthening system alone, are parametrically investigated. A promising method based on the bond mechanism between ETS strengthening and concrete is then proposed for predicting the shear resistance forces of the strengthened beams. An expression for the maximum bond stress of the ETS bars to concrete is developed. This new expression eliminates the difficulty in the search and selection of appropriate bond parameters from adhesion tests. The results obtained from the FE models and analytical models are validated by comparison with those measured from the experiments. Consequently, the model proposed in this study demonstrates better performance and more accuracy for prediction of the beam shear-carrying capacity than those of existing models. The results obtained from this study can also serve researchers and engineers in selection of the proper shear strength models for design of ETS-strengthened RC beams.

关键词： embedded through-section strengthening fiber-reinforced polymer finite element shear strength model bond mechanism

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基于灰色系统理论的时序数据挖掘技术

刘斌,刘思峰,党耀国

《中国工程科学》 2003年第5卷第9期页码 32-35

摘要：

阐述了嵌入知识的数据挖掘思想和数据挖掘技术现状，结合灰色系统理论首次提出了时序数据挖掘的灰色系统方法集（GDMS），并以灰色系统中的GM（1,1）模型为例，介绍了其具体算法。应用此算法对上海市2002～2005年的上网户数进行了预测。

关键词：灰色系统嵌入知识 GDMS 预测

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Heat-spreading analysis of a heat sink base embedded with a heat pipe

B. V. BORGMEYER, H. B. MA,

《能源前沿（英文）》 2010年第4卷第2期页码 143-148 doi: 10.1007/s11708-010-0013-1

摘要： A simplified model predicting the heat transfer performance of a heat sink base with a high thermal conductivity was developed. Numerical analysis was performed using the commercial software FLUENT. The investigation indicates that for heat sink bases with a high effective thermal conductivity, such as the base embedded with a typical heat pipe, the entire heat sink can be modeled as a flat plate with a uniform temperature and an effective convection heat transfer coefficient. This simplified model can be used to determine the heat transfer performance of a heat sink embedded with a typical heat pipe or vapor chamber.

关键词： heat pipe heat sink microprocessor heat removal

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Preparation of nZVI embedded modified mesoporous carbon for catalytic persulfate to degradation of reactive

《环境科学与工程前沿（英文）》 2021年第15卷第5期 doi: 10.1007/s11783-020-1372-4

摘要：

• The MCNZVI is prepared as an interesting material for PS activation.

关键词： MCNZVI Core-shell structure Reactive Black 5 Persulfate Mechanism

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Immobilization and characterization of the mycelia-embedded polylysine-alginate beads and their decolorization

《化学科学与工程前沿（英文）》 2023年第17卷第12期页码 2001-2013 doi: 10.1007/s11705-023-2341-9

摘要： Liquid fermented fungal mycelia with decolorization capability have potential applications in scale-up. In this work, the Lactarius deliciosus mycelia were immobilized on -polylysine-alginate beads, and the decolorization effects of -polylysine-alginate beads were demonstrated along with Coomassie brilliant blue G-250 as a model dye. Morphology observation confirmed the beads had an exterior film and interior capsule with honeycomb microstructures suitable for mycelia growth. It was manifested that the maximum decolorization efficiency for mycelia was 98.5% at a removal rate of 0.68 mg·L^‒1·h after 3 days. In comparison, the decolorization efficiency of the immobilized mycelia reached the maximum value of 97.3% at a removal rate of 6.1 mg·L^‒1·h after 8 h. The enzyme activities of lignin peroxidase and laccase tested in the immobilized mycelia were significantly higher than in that of the free ones, such as the lignin peroxidase had the highest enzyme activity of 77.6 ± 7.4 U·L^‒1 in the former, while of 27.4 ± 8.7 U·L^‒1 in the latter. The immobilization of L. deliciosus mycelia could improve the decolorization of Coomassie brilliant blue G-250 efficiently. The prepared -polylysine-alginate beads embedded with L. deliciosus mycelia have very good reusability and a great potential in decolorizing analog dyes.

关键词： Lactarius deliciosus mycelia immobilization decolorization polylysine-alginate beads Coomassie brilliant blue G-250

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嵌入式Internet控制系统的设计与分析

宗群,李然,王波

《中国工程科学》 2005年第7卷第5期页码 53-56

摘要：

对嵌入式Internet控制系统设计的相关问题进行了研究，包括系统需求、系统结构、设计与实现方法等，在此基础上建立了具有嵌入式Internet节点的控制系统，实现了其在电梯远程监控系统（REMS）中的应用，通过测试证明可以很好的满足实际需要。

关键词：嵌入式Internet控制系统 REMS DS80C400 JAVA TINI

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Spatial embedded reinforcement of 20-node block element for analysis PC bridges

LONG Peiheng, DU Xianting, CHEN Weizhen

《结构与土木工程前沿（英文）》 2008年第2卷第3期页码 274-280 doi: 10.1007/s11709-008-0039-1

摘要： The formula for the contribution of prestressed reinforcement on embedded reinforcement element is derived according to the mechanical behavior of PC bridges and the foundational principle of finite element method. Mechanical concept is definite and examples validate the calculation results. Reinforcement element model allows generating a finite element mesh without taking into consideration the layout of reinforcements. Furthermore, the prestressing tendon may pass through the concrete elements in an arbitrary manner. It is an effective approach that the no-node loads are diverted from the tendons to the adjacent concrete elements. A useful arithmetic analysis of the spatial curved tendon PC Bridges is provided.

关键词： arithmetic analysis calculation prestressed reinforcement mechanical arbitrary

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Ultrafine Fe-modulated Ni nanoparticles embedded within nitrogen-doped carbon from Zr-MOFs-confined conversion

《化学科学与工程前沿（英文）》 2022年第16卷第7期页码 1114-1124 doi: 10.1007/s11705-021-2087-1

摘要： Improvement of the low-cost transition metal electrocatalyst used in sluggish oxygen evolution reaction is a significant but challenging problem. In this study, ultrafine Fe-modulated Ni nanoparticles embedded in a porous Ni-doped carbon matrix were produced by the pyrolysis of zirconium metal-organic-frameworks, in which 2,2′-bipyridine-5,5′-dicarboxylate operating as a ligand can coordinate with Ni²⁺ and Fe³⁺. This strategy allows formation of Fe-modulated Ni nanoparticles with a uniform dimension of about 2 nm which can be ascribed to the spatial blocking effect of ZrO₂. This unique catalyst displays an efficient oxygen evolution reaction electrocatalytic activity with a low overpotential of 372 mV at 10 mA·cm^–2 and a small Tafel slope of 84.4 mV·dec^–1 in alkaline media. More importantly, it shows superior durability and structural stability after 43 h in a chronoamperometry test. Meanwhile, it shows excellent cycling stability during 4000 cyclic voltammetry cycles. This research offers a new insight into the construction of uniform nanoscale transition metals and their alloys as highly efficient and durable electrocatalysts.

关键词： metal-organic framework pyrolysis ultrafine Fe-modulated Ni nanoparticles oxygen evolution reaction

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Managing obsolescence of embedded hardware and software in secure and trusted systems

Zachary A. COLLIER, James H. LAMBERT

《工程管理前沿（英文）》 2020年第7卷第2期页码 172-181 doi: 10.1007/s42524-019-0032-5

摘要： Obsolescence of integrated systems which contain hardware and software is a problem that affects multiple industries and can occur for many reasons, including technological, economic, organizational, and social factors. It is especially acute in products and systems that have long life cycles, where a high rate of technological innovation of the subcomponents result in a mismatch in life cycles between the components and the systems. While several approaches for obsolescence forecasting exist, they often require data that may not be available. This paper describes an approach using non-probabilistic scenarios coupled with decision analysis to investigate how particular scenarios influence priority setting for products and systems. Scenarios are generated from a list of emergent and future conditions related to obsolescence. The key result is an identification of the most and least disruptive scenarios to the decision maker’s priorities. An example is presented related to the selection of technologies for energy islanding, which demonstrates the methodology using six obsolescence scenarios. The paper should be of broad interest to scholars and practitioners engaged with enterprise risk management and similar challenges of large-scale systems.

关键词： enterprise risk management diminishing manufacturing sources and material shortages scenario-based preferences systems engineering deep uncertainty product life cycle

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嵌入式Internet 中Nagle 算法及其应用研究

王宝宝,余世明,王振宇

《中国工程科学》 2014年第16卷第2期页码 101-105

摘要：

嵌入式Internet 中使用短帧数据包，使得网络带宽的利用率极低，拥塞发生的可能性加大。标准transmission control protocol（TCP）协议中应用Nagle 算法减少短帧数量。通过ARM7 32 位micro control unit（MCU）和上位机personal computer（PC）构建嵌入式Internet 网络，分析Nagle 算法的原理和工作机制。针对嵌入式系统中Nagle 算法和上位机延迟确认策略交互产生的暂时性“死锁”问题，提出了在不修改Nagle算法的基础上，通过提高采样频率或者填充缓冲区的方法来避免暂时性“死锁”。测试表明，该方案是有效可行的。

关键词： Nagle算法死锁延迟确认策略 ARM7 嵌入式Internet

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面向异构集成应用的“片上”嵌入式冷却技术的研究进展 Review

Srikanth Rangarajan, Scott Schiffres, Bahgat Sammakia

《工程（英文）》 2023年第26卷第7期页码 185-197 doi: 10.1016/j.eng.2022.10.019

摘要：

The electronics packaging community strongly believes that Moore’s law will continue for another few years due to recent technological efforts to build heterogeneously integrated packages. Heterogeneous integration (HI) can be at the chip level (a single chip with multiple hotspots), in multi-chip modules, or in vertically stacked three-dimensional (3D) integrated circuits. Flux values have increased exponentially with a simultaneous reduction in chip size and a significant increase in performance, leading to increased heat dissipation. The electronics industry and the academic research community have examined various solutions to tackle skyrocketing thermal-management challenges. Embedded cooling eliminates most sequential conduction resistance from the chip to the ambient, unlike separable cold plates/heat sinks. Although embedding the cooling solution onto an electronic chip results in a high heat transfer potential, technological risks and complexity are still associated with the implementation of these technologies and with uncertainty regarding which technologies will be adopted. This manuscript discusses recent advances in embedded cooling, fluid selection considerations, and conventional, immersion, and additive manufacturing-based embedded cooling technologies.

关键词：电子冷却嵌入式冷却浸入式冷却

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Developing a power monitoring and protection system for the junction boxes of an experimental seafloor

Jun WANG,De-jun LI,Can-jun YANG,Zhi-feng ZHANG,Bo JIN,Yan-hu CHEN

《信息与电子工程前沿（英文）》 2015年第16卷第12期页码 1034-1045 doi: 10.1631/FITEE.1500099

摘要： A power monitoring and protection system based on an embedded processor was designed for the junction boxes (JBs) of an experimental seafloor observatory network in China. The system exhibits high reliability, fast response, and high real-time performance. A two-step power management method which uses metal-oxide-semiconductor field-effect transistors (MOSFETs) and a mechanical contactor in series was adopted to generate a reliable power switch, to limit surge currents and to facilitate automatic protection. Grounding fault diagnosis and environmental monitoring were conducted by designing a grounding fault detection circuit and by using selected sensors, respectively. The data collected from the JBs must be time-stamped for analysis and for correlation with other events and data. A highly precise system time, which is necessary for synchronizing the times within and across nodes, was generated through the IEEE 1588 (precision clock synchronization protocol for networked measurement and control systems) time synchronization method. In this method, time packets were exchanged between the grandmaster clock at the shore station and the slave clock module of the system. All the sections were verified individually in the laboratory prior to a sea trial. Finally, a subsystem for power monitoring and protection was integrated into the complete node system, installed in a frame, and deployed in the South China Sea. Results of the laboratory and sea trial experiments demonstrated that the developed system was effective, stable, reliable, and suitable for continuous deep-sea operation.

关键词： Power monitoring and protection Embedded processor Seafloor observatory network IEEE 1588 Junction boxes

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面向工业过程监控的嵌入式轻型图形用户界面构件库与人机功效优化方法 Research Articles

Da-peng TAN, Shu-ting CHEN, Guan-jun BAO, Li-bin ZHANG

《信息与电子工程前沿（英文）》 2018年第19卷第5期页码 604-625 doi: 10.1631/FITEE.1601660

摘要：面向工业过程监控的嵌入式轻型图形用户界面（GUI）构件库开发具有较高难度，当前方法在实时任务处理与人机功效等方面存在不足。针对上述问题，提出一种基于嵌入式Qt技术（Qt/E）的轻型GUI构件库设计方法。根据工业过程监控需求，建立构件库实体—关系（E-R）模型，定义系统功能构架与模块数据耦合关系。考虑嵌入式目标系统差异，搭建交叉编译环境以实现Qt/E共享库文件的按需裁剪。基于信号—槽通信接口，提出一种无需回调指针的消息映射方法，优化系统上下文切换性能。结合多线程控制技术，面向数据采集、计算与显示的并行任务处理能力得到强化，从而提高系统实时性与鲁棒性。通过滚动页面方法优化人机交互过程，并利用工业心理学方法验证系统人机功效性能。数值实例模拟与工业现场实验结果表明，与Windows-CE-GUI和Android-GUI相比：实时读写正确率分别提高26%与29%；构件库最小可裁减至900 kB，并可支持12种嵌入式硬件平台；系统平均会话切换时间可控制在0.6 s以内，关键人机功效指标可满足不同工业应用需求。

关键词：嵌入式轻型图形用户界面（GUI）；嵌入式Qt技术（Qt/E）；工业过程监控；多线程；人机功效

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标题作者时间类型操作

Seismic behavior of cantilever wall embedded in dry and saturated sand

Sanku KONAI, Aniruddha SENGUPTA, Kousik DEB

期刊论文

Torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic half-space

Dazhi WU,Lu YU

期刊论文

Shear strength model of the reinforced concrete beams with embedded through-section strengthening bars

Linh Van Hong BUI; Phuoc Trong NGUYEN

期刊论文