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A novel method to investigate voltage stability of IEEE-14 bus wind integrated system using PSAT

Satish KUMAR,Ashwani KUMAR,N. K. SHARMA

《能源前沿（英文）》 2020年第14卷第2期页码 410-418 doi: 10.1007/s11708-016-0440-8

摘要： The maximum demand of power utilization is increasing exponentially from base load to peak load in day to day life. This power demand may be either industrial usage or household applications. To meet this high maximum power demand by the consumer, one of the options is the integration of renewable energy resources with conventional power generation methods. In the present scenario, wind energy system is one of the methods to generate power in connection with the conventional power systems. When the load on the conventional grid system increases, various bus voltages of the system tend to decrease, causing serious voltage drop or voltage instability within the system. In view of this, identification of weak buses within the system has become necessary. This paper presents the line indices method to identify these weak buses, so that some corrective action may be taken to compensate for this drop in voltage. An attempt has been made to compensate these drops in voltages by integration of renewable energy systems. The wind energy system at one of the bus in the test system is integrated and the performance of the system is verified by calculating the power flow (PF) using the power system analysis tool box (PSAT) and line indices of the integrated test system. The PF and load flow results are used to calculate line indices for the IEEE-14 bus test system which is simulated on PSAT.

关键词： voltage stability line indices power system analysis tool box (PSAT) wind system line loading power flow (PF)

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Impact evaluation of large scale integration of electric vehicles on power grid

Rabah BOUDINA, Jie WANG, Mohamed BENBOUZID, Farid KHOUCHA, Mohamed BOUDOUR

《能源前沿（英文）》 2020年第14卷第2期页码 337-346 doi: 10.1007/s11708-018-0550-6

摘要： As the world witnesses a continual increase in the global energy demand, the task of meeting this demand is becoming more difficult due to the limitation in fuel resources as well as the greenhouse gases emitted which accelerate the climate change. As a result, introducing a policy that promotes renewable energy (RE) generation and integration is inevitable for sustainable development. In this endeavor, electrification of the transport sector rises as key point in reducing the accelerating environment degradation, by the deployment of new type of vehicles referred to as PHEV (plug-in hybrid electric vehicle). Besides being able to use two kinds of drives (the conventional internal combustion engine and the electric one) to increase the total efficiency, they come with a grid connection and interaction capability known as the vehicle-to-grid (V2G) that can play a supporting role for the whole power system by providing many ancillary services such as energy storage mean and power quality enhancer. Unfortunately, all these advantages do not come alone. The uncontrolled large scale EV integration may present a real challenge and source of possible failure and instability for the grid. In this work the large scale integration impact of EVs will be investigated in details. The results of power flow analysis and the dynamic response of the grid parameters variation are presented, taking the IEEE 14 bus system as a test grid system.

关键词： PHEV vehicle-to-grid (V2G) technical impact IEEE 14 bus power flow analysis

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基于最小速率保证的IEEE 802-16e公平调度算法

史俊财,胡爱群,关艳峰

《中国工程科学》 2008年第10卷第2期页码 54-59

摘要：

针对IEEE 802-16e协议的特点，提出了一种基于最小速率保证的IEEE 802-16e 公平调度（MTRFS）算法。

关键词： IEEE 802-16e 调度算法 QoS 公平

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使用IEEE 2030.5 标准在电网边缘进行可交易需求响应操作 Article

Javad Fattahi, Mikhak Samadi, Melike Erol-Kantarci, Henry Schriemer

《工程（英文）》 2020年第6卷第7期页码 801-811 doi: 10.1016/j.eng.2020.06.005

摘要：完整的基于实验室的实施（据我们所知）首次实现了全面的TDR案例，该案例完全符合电气与电子工程师协会（IEEE）2030.5标准，解决了网络安全智能能源规范（SEP）应用协议的互操作性。基于在较长时间内获取的一组智能电表数据，我们参与了多个TDR场景，并通过符合IEEE 2030.5标准的全功能实现证明了我们的方案可以在现实条件下将网络峰值功耗降低22%。

关键词：可交易需求响应 IEEE 2030.5 智能电网多代理系统邻域协调

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Special Issue for the 14th Global Chinese Chemical Engineering Symposium

《化学科学与工程前沿（英文）》 2023年第17卷第10期页码 1321-1322 doi: 10.1007/s11705-023-2351-7

摘要： Special Issue for the 14th Global Chinese Chemical Engineering Symposium

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Downregulation effects of beta-elemene on the levels of plasma endotoxin, serum TNF-alpha, and hepatic CD14

null

《医学前沿（英文）》 2011年第5卷第1期页码 101-105 doi: 10.1007/s11684-011-0111-4

摘要：

It has been demonstrated that β-elemene could protect against carbon tetrachloride (CCl₄)-induced liver fibrosis in our laboratory work, and the aim of this paper is to reveal the protective mechanisms of β-elemene. The hepatic fibrosis experimental model was induced by the hypodermical injection of CCl₄ in Wistar male rats. β-elemene was intraperitoneally administered into rats for 8 weeks (0.1 mL/100 g bodyweight per day), and plasma endotoxin content was assayed by biochemistry. The serum TNF-α level was detected using radioactive immunity. CD14 expression in rat livers was measured by immunohistochemistry and Western blot. The results showed that β-elemene can downregulate the levels of plasma endotoxins, serum TNF-α, and hepatic CD14 expression in rats with liver fibrosis. β-elemene plays an important role in downregulating the lipopolysaccharide signal transduction pathway, a significant pathway in hepatic fibrosis development.

关键词： liver fibrosis beta-elemene endotoxin CD14

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Heterologous expression of signal protein 14-3-3 in and the subsequent immune response in mice

ZHENG Meijuan, SHEN Jilong, LUO Qingli, XU Yuanhong

《医学前沿（英文）》 2008年第2卷第1期页码 95-99 doi: 10.1007/s11684-008-0017-y

摘要： Schistosomiasis japonica, a zoonosis caused by , is endemic to the Philippines and China. Several vaccine candidates have been identified and tested in different animal models, but it is still unclear which will be optimal for testing in the field. Therefore, new antigens and strategies are necessary for vaccine development against schistosomiasis japonica. The Sj14-3-3 gene was amplified and subcloned into the expression vector pPICZ?-B and transformed into X-33 by electroporation. Three transformants were induced with methanol. The cultural supernatant was collected and tested by SDS-PAGE and Western blotting. The protein of rSj14-3-3 was prepared and purified and BALB/c mice were immunized which was followed by a challenging infection. The immuno-protection was then evaluated. The Sj14-3-3 gene was expressed and secreted into the medium and its molecular weight was about 35000 as determined by SDS-PAGE. Western blotting showed that the protein had a high specificity against mouse-anti-Sj14-3-3 monoclonal antibody and rSj14-3-3 had a promising immune reactivity. The results of the immuno-protective experiments revealed that the worm reduction was 26.0%, 32.2%, and 36.8%, respectively. The number of eggs in liver tissue was reduced by 36.8%, 43.2%, and 46.1%, respectively. The recombinant Sj14-3-3 of eukaryotic expression in was successfully harvested. The molecular vaccine of Sj14-3-3 could partially induce resistance to the infection with in BALB/c mice. The recombinant protein Sj14-3-3 has promising immunological potentials for further approach to the diagnosis and development of molecular vaccine.

关键词： development challenging rSj14-3-3 resistance cultural supernatant

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Lightweight design of an electric bus body structure with analytical target cascading

《机械工程前沿（英文）》 2023年第18卷第1期 doi: 10.1007/s11465-022-0718-y

摘要： Lightweight designs of new-energy vehicles can reduce energy consumption, thereby improving driving mileage. In this study, a lightweight design of a newly developed multi-material electric bus body structure is examined in combination with analytical target cascading (ATC). By proposing an ATC-based two-level optimization strategy, the original lightweight design problem is decomposed into the system level and three subsystem levels. The system-level optimization model is related to mass minimization with all the structural modal frequency constraints, while each subsystem-level optimization model is related to the sub-structural performance objective with sub-structure mass constraints. To enhance the interaction between two-level systems, each subsystem-level objective is reformulated as a penalty-based function coordinated with the system-level objective. To guarantee the accuracy of the model-based analysis, a finite element model is validated through experimental modal test. A sequential quadratic programming algorithm is used to address the defined optimization problem for effective convergence. Compared with the initial design, the total mass is reduced by 49 kg, and the torsional stiffness is increased by 17.5%. In addition, the obtained design is also validated through strength analysis.

关键词： electric vehicle body in white (BIW) lightweight analytical target cascading (ATC)

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Intelligent algorithm for optimal meter placement and bus voltage estimation in ring main distribution

L. RAMESH, N. CHAKRABORTY, S. P. CHOWDHURY

《能源前沿（英文）》 2012年第6卷第1期页码 47-56 doi: 10.1007/s11708-011-0159-5

摘要： The advancement in power distribution system poses a great challenge to power engineering researchers on how to best monitor and estimate the state of the distribution network. This paper is executed in two stage processes. The first stage is to identify the optimal location for installation of monitoring instrument with minimal investment cost. The second stage is to estimate the bus voltage magnitude, where real time measurement is conducted and measured through identified meter location which is more essential for decision making in distribution supervisory control and data acquisition system (DSCADA). The hybrid intelligent technique is applied to execute the above two algorithms. The algorithms are tested with institute of electrical and electronics engineers (IEEE) and Tamil Nadu electricity board (TNEB) benchmark systems. The simulated results proves that the swarm tuned artificial neural network (ANN) estimator is best suited for accurate estimation of voltage with different noise levels.

关键词： artificial intelligence power distribution control state estimation

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全生命周期成本分析框架下的电动公交充电器部署和车队管理 Article

曾子凌, 王帅安, 曲小波

《工程（英文）》 2023年第21卷第2期页码 45-60 doi: 10.1016/j.eng.2022.07.019

摘要：

尽管城市交通电气化快速发展，但电池电动公交车（EB）车队的系统规划和管理进展却较为落后。本研究首先综述了影响电池电动系统的基本问题，包括充电站部署、电池尺寸、公交车调度和生命周期分析。目前，EB系统的规划和运行是按顺序进行的，公交车调度是在公交车队和基础设施部署完毕后进行的，这导致了资源利用率低和资源浪费。对此，本文提出了混合整数规划模型整合充电站部署和公交车队管理，以尽可能低的生命周期成本（LCC），包括所有权、运营、维护和排放费用，缩小最佳规划与运营之间的差距。引入了分支定价算法，以减少寻找最佳解决方案所需的计算工作量。本研究还通过分析真实案
例，与目前的公交运营策略和充电站布局相比，一条公交线路的LCC优化后可显著降低30.4%。提出的方法不仅可以进行生命周期分析，还可以为交通部门和运营商提供可靠的充电桩部署及单线和多线的公交调度计划，这两者都是未来具有高电气化普及率的交通系统中决策支持的关键要求，此研究也有助于推动可持续交通的发展。

关键词：电动公交车充电站部署电池尺寸公交车调度生命周期分析

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基于多跳双向认证的802.16Mesh网络SA管理机制

王兴建,胡爱群,黄玉划

《中国工程科学》 2006年第8卷第9期页码 69-73

摘要：

IEEE802.16-2004无线城域网（wireless-MAN）标准支持的多跳（Mesh）网络是一种树状网络和adhoc网络结合的新型网络。

关键词： IEEE80216 Mesh 节点多跳双向认证修正路由

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基于CAN总线的TT-FPS调度算法研究及其性能分析

吕伟杰,刘鲁源,王毅新

《中国工程科学》 2006年第8卷第5期页码 45-48

摘要：

针对CAN总线中消息在固定优先级调度（FPS）算法下传输不可预知、低优先级消息容易被阻塞的问题，提出了一种基于时间触发机制的固定优先级调度（TT-FPS）算法，给出了最糟糕响应时间的计算方法。然后以纯电动汽车消息系统为例进行了TT-FPS的性能分析，验证了TT-FPS 较FPS有更好的性能。

关键词： CAN总线 TT-FPS 最糟糕响应时间

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Prediction on CO uptake of recycled aggregate concrete”, Frontiers of Structural and Civil Engineering, 14

《结构与土木工程前沿（英文）》 2021年第15卷第6期页码 1504-1506 doi: 10.1007/s11709-021-0782-0

摘要： A methodology to compute the CO₂ uptake of recycled aggregate concrete is proposed in the commented paper. Besides some typos in several formulas, it is found that the approach to estimate the specific surface area of the recycled aggregates is not correct. This issue has some impact in the conclusions of the commented paper. Therefore, aiming to improve the understanding, accuracy and findings of the commented paper, an alternative approach to estimate the specific surface area of the recycled aggregates, as well as an erratum of the formulas and revised conclusions are suggested.

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Optimization of urban bus operation frequency under common route condition with rail transit

Bin YU, Sijia REN, Enze WU, Yifan ZHOU, Yunpeng WANG

《工程管理前沿（英文）》 2017年第4卷第4期页码 451-462 doi: 10.15302/J-FEM-2017036

摘要： The overlap of bus and rail transit routes is common in China. This overlap provides passengers multiple choices for one trip. However, the availability of multiple options would cause uncertainty in the travel distribution of passengers. Given that buses and rail transits are becoming increasingly common, this paper aims to present the overlapped operation condition of bus and rail transit using a bi-level model from the perspective of bus operators. Frequency optimization model is established in the upper-level model. A heuristic algorithm called shuffled complex evolution (SCE-UA) method is used to solve the established frequency optimization model, and three other heuristic methods are compared with SCE-UA. A lower-level Logit model based on Agent simulation is set for traffic mode split. Data on the transit system in Dalian city are chosen as an example to test the feasibility of the model and the algorithm. Results show that as the overlapped optimization of bus route and rail transit routes changed primary bus frequency, the use of SCE-UA to solve such problems has evident advantages and feasibility; furthermore, changed bus frequency would improve bus operations.

关键词： common route bus operation frequency bi-level model Agent simulation SCE-UA algorithm

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Prevalence of asthma symptoms in Golestan schoolchildren aged 6–7 and 13–14 years in Northeast Iran

null

《医学前沿（英文）》 2016年第10卷第3期页码 345-350 doi: 10.1007/s11684-016-0462-y

摘要：

Asthma is the most common chronic disease among children, and its incidences are often imminent among elementary schoolchildren. This study aimed to examine the prevalence of asthma symptoms in Golestan schoolchildren aged 6–7 and 13–14 years in Northeast Iran. The prevalence rate was compared according to age group (aged 6–7 years vs. aged 13–14 years) and gender (male vs. female). In this cross-sectional study, 1706 Iranian schoolchildren aged 6–7 and 13–14 years in Golestan Province were enrolled. Participants completed questionnaires between February and July 2014. Asthma symptoms were assessed using the questionnaire of the International Study of Asthma and Allergies in Childhood protocol in Persian. The logistic regression model was used to estimate the odds ratios (ORs) and 95% confidence intervals (CIs) of the asthma symptoms for each of the gender and age groups. The prevalence rates of “current asthma” symptoms and “asthma ever” in all the children were estimated as 9.5% and 7.5%, respectively. The prevalence of asthma (“asthma ever” and “wheezing in the past 12 months”) in junior high schoolchildren (aged 13–14 years) is higher than that in elementary schoolchildren (aged 6–7 years) (P <0.05). The prevalence of the severity of wheezing in girls is lower than that in boys (OR= 1.7, 95%CI= 1.06–2.96, P = 0.02). Asthma is still a major public health problem. This study shows that the prevalence of the asthma symptoms in boys is lower than that in girls in both age groups, and the severity of asthma in girls is higher than that in boys aged 13–14 years.

关键词： asthma asthma symptoms epidemiology childhood chronic disease