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电动汽车充电站群电能质量协同监测技术

机械设计与制造 2024年第6期400卷 21-25页

作者：李宏胜武光华柳长发郭世萍国网河北省电力有限公司营销服务中心河北石家庄050000

为解决现有电能质量监测技术存在的监测范围小、精度低的问题,优化设计电动汽车充电站群电能质量协同监测技术。根据电动汽车充电站群的组成结构,构建充电站群模型,模拟充电过程。针对电能质量指标配置相应的电能质量监测点,协同采集与... 详细信息

为解决现有电能质量监测技术存在的监测范围小、精度低的问题,优化设计电动汽车充电站群电能质量协同监测技术。根据电动汽车充电站群的组成结构,构建充电站群模型,模拟充电过程。针对电能质量指标配置相应的电能质量监测点,协同采集与处理电动汽车充电站群暂态信号,通过对扰动、谐波/间谐、电压偏差、频率偏差等指标的计算,得出电能质量的协同监测结果。通过与现有监测技术的对比,所设计监测技术的监测范围扩大了1306.24m^(2),且监测误差更低。

关键词：电动汽车充电站充电站群电能电能质量协同监测技术

Pricing permanent convertible bonds in EVG model

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Applied Mathematics(A Journal of Chinese Universities) 2012年第3期27卷 268-280页

作者： YANG Xiao-feng YU Jin-ping HUANG Wen-li li sheng-hong Department of Mathematics Zhejiang UniversityHangzhou 310027China Department of Mathematics Zhejiang University of Science and TechnologyHangzhou 310023 China

By considering the failure of normal distribution and continuous assumption in financial modeling, this paper attempts to apply the Exponential Variance Gamma （EVG） model into the pricing framework of permanent convertible bonds with call clause. Following framework of Gapeev ＆ Kiihn（2005）, we obtain an explicit solution to the bond price and optimal stopping strategies, which shows that the new pricing framework is quite different from the continuous model and even the Jump Diffusion model. Compared with the numerical calculation, the closed form results price convertible bonds quickly and accurately.

关键词： convertible bond call clause variance gamma process.

Pricing VIX options in a 3/2 plus jumps model

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Applied Mathematics(A Journal of Chinese Universities) 2018年第3期33卷 323-334页

作者： TAN Xiao-yu WANG Cheng-xiang HUANG Wen-li li sheng-hong Department of Mathematics Zhejiang University China Academy of Financial Research Zhejiang University of Finance and Economics

This paper proposes and makes a study of a new model(called the 3/2 plus jumps model) for VIX option pricing. The model allows the mean-reversion speed and volatility of volatility to be highly sensitive to the actual level of VIX. In particular, the positive volatility skew is addressed by the 3/2 plus jumps model. Daily calibration is used to prove that the proposed model preserves its validity and reliability for both in-sample and out-of-sample *** results show that the models are capable of fitting the market price while generating positive volatility skew.

关键词： pricing VIX options 3/2 plus jumps model positive volatility skew

Boosting reversible charging of li-ion batteries at low temperatures by a synergy of propylene carbonate-based electrolyte and defective graphite

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Nano Research 2024年第3期17卷 1491-1499页

作者： Yingqiang Wu Jiao Zhang Jinli liu li sheng Bo Zhang limin Wang Siqi Shi li Wang hong Xu Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences(CAS)Changchun 130022China China National Quality Supervision and Inspection Center for Industrial Explosive Materials Nanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Materials Genome InstituteShanghai UniversityShanghai 200444China

Propylene carbonate(PC)-based electrolytes have exhibited significant advantages in boosting the low-temperature discharging of graphite-based li-ion ***,it is still unclear whether they can improve the charging property and suppress lithium *** this topic is challenging due to the problem of electrochemical *** overcome this issue,we introduced graphite with phase *** results show that the pouch-type full batteries using PC-based electrolyte exhibit steady performance over 500 cycles and can be reversibly charged over 30 times at-20℃ with an average Coulombic efficiency of 99.95%,while the corresponding value for the conventional ethylene carbonate(EC)-based electrolyte sample is only 31.20%.This indicates that the use of PC-based electrolyte significantly suppresses lithium plating during low-temperature *** further demonstrate that the improved performance is mainly attributed to the unique solvation structure,where PF-6more anions participate in solvation,leading to the formation of a stable F-rich solid state electrolyte interface on the graphite surface and a lower reduction tendency of li+*** work inspires new ideas for the design of PC-based electrolytes for low-temperature charging and fast-charging batteries.

关键词： lithium-ion batteries graphite propylene carbonate low-temperature charging

Optimal investment with transaction costs based on exponential utility function:a parabolic double obstacle problem

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Applied Mathematics(A Journal of Chinese Universities) 2011年第4期26卷 483-492页

作者： BAO Qun-fang YANG Jing-yang SUN Chao li sheng-hong Department of Mathematics Zhejiang University Hangzhou 310027 China Jingdezhen Ceramic Institute Jiangxi 333403 China

This paper concerns optimal investment problem with proportional transaction costs and finite time horizon based on exponential utility function. Using a partial differential equation approach, we reveal that the problem is equivalent to a parabolic double obstacle problem involving two free boundaries that correspond to the optimal buying and selling policies. Numerical examples are obtained by the binomial method.

关键词： Optimal investment transaction costs double obstacle problem stochastic control exponential utility function.

Synthesis and Crystal Structure of (2S,2'S,4'R)-2-(1-Hydroxy-1-ethylpropyl)-1-[(1'-p-tosyl-4'-hydroxypyrrolidin-2'-yl)methyl]pyrrolidine

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1203-1208页

作者： FU Yu-Qin DING li-Na ZHANG sheng-hong TAO Jing-Chao ZHU Yu Department of Chemistry New Drug Research ＆ Development Center Zhengzhou University Zhengzhou 450052 China

The title compound （2S,2＇S,4＇R）-2-（1-hydroxy-1-ethylpropyl）-1-[（1＇-p-tosyl-4＇- hydroxypyrolidin-2＇-yl）methyl]pyrrolidine synthesized by using （2S,4R）-4-hydroxy-L-proline and L-proline as the main materials was characterized through IR, ^1H NMR, ^13C NMR and HRMS spectra as well as single-crystal X-ray diffraction analysis. There is one equivalent ethanol involved in the crystal （C23H40N2O5S, Mr = 456.63）. The crystal belongs to the triclinic system, space group P1, a = 6.5628（13）, b = 8.4228（17）, c = 11.957（2）°A, α= 80.54（3）,β= 83.19（3）, γ= 89.89（3）°, V= 647.3（2） °A^3, Z = 1, D, = 1.171 g/cm^3, λ（MoKα） = 0.71073°A,β = 0.158 mm^-1, F（000） = 248, the final R = 0.0465 and wR = 0.1336 for 1769 observed reflections with I〉 2σ（I）. The adjacent molecules of compound 5 are linked through intermolecular hydrogen bonds formed by the secondary hydroxy group of one molecule with the tertiary hydroxy group of another one, and the molecular chains are further linked by ethanol through two kinds of hydrogen bonds with two molecules from different chains respectively to form a supramolecular structure.

关键词： proline derivative chiral amino alcohol synthesis crystal structure

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贵州地区居住建筑采暖现状与可行性分析

遵义师范学院学报 2024年第2期26卷 70-73页

作者：何鸣刘晶蒲爽李生红遵义师范学院工学院贵州遵义563006

作者分析了贵州地区不同城市的气候特点,通过调查目前居住建筑采暖现状,从能源利用、环境保护、初投资及运行成本、人员热舒适性等方面分析了集中供暖与局部供暖的优缺点,提出了因地制宜适合不同气候分区的采暖方案。

关键词：居住建筑集中供暖局部供暖

A New Approach to VC Routing in ATM Networks

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Wuhan University Journal of Natural Sciences 2000年第3期5卷 329-333页

作者： li sheng-hong Du Xin-hua Zhu hong-wen liu Ze-min Department of Electronic Engineering Shanghai Jiaotong University Shanghai 200030 China Department of Radio Engineering Beijing University of Posts and Telecommunications Beijing 100088 China

A new ant-algorithm-based routing approach is proposed for the VC routing problem with considering the comprehensive effect between the resource utilization and the load balance in ATM networks. In the approach, the backup paths are calculated first, and then an ant algorithm based on the ability of ants to find the shortest path between their nest and the food source during their searching food, is constructed to optimize the VC global route. Simulation results show that the proposed approach can realize VC routing effectively according to the current traffic states in the networks and the user-specified delay requirements.

关键词： ATM networks virtual channel (VC) ant algorithm routing

A generalization of exotic options pricing formulae

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第4期7卷 584-590页

作者： li Shu-jin li sheng-hong Department of Mathematics Zhejiang University Hangzhou 310027 China Department ofFoundatton Jiangsu Teachers University of Technology Changzhou 213015 China

Exotic options, or “path-dependent” options are options whose payoff depends on the behavior of the price of the underlying between 0 and the maturity, rather than merely on the final price of the underlying, such as compound options, reset options and so on. In this paper, a generalization of the Geske formula for compound call options is obtained in the case of time-dependent volatility and time-dependent interest rate by applying martingale methods and the change of numeraire or the change of probability measure. An analytic formula for the reset call options with predetermined dates is also derived in the case by using the same approach. In contrast to partial differential equation (PDE) approach, our approach is simpler.

关键词： Risk-neutral measure Compound options Change of probability measure Numeraire Girsanov's theorem