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Transfer-based Approximate Dynamic Programmingfor Rolling Security-constrained Unit Commitment with Uncertainties

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Protection and Control of Modern Power Systems 2024年第5期9卷 42-53页

作者： Jianquan Zhu Kai Zeng Jiajun Chen Wenmeng Zhao Wenhao liu Wenkai Zhu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China Electric Power Research Institute China Southern Power GridGuangzhou 510700China

This paper studies the rolling security-constrained unit commitment(RSCUC)problem with AC power flow and *** this NP-hard problem,it is modeled as a Markov decision process,which is then solved by a transfer-based approximate dynamic programming(TADP)algorithm proposed in this *** from traditional approximate dynamic programming(ADP)algorithms,TADP can obtain the commitment states of most units in advance through a decision transfer technique,thus reducing the action space of TADP ***,compared with traditional ADP algorithms,which require to determine the commitment state of each unit,TADP only needs determine the unit with the smallest on-state probability among all on-state units,thus further reducing the action *** proposed algorithm can also prevent the iter-ative update of value functions and the reliance on rolling forecast information,which makes more sense in the rolling decision-making process of ***,nu-merical simulations are carried out on a modified IEEE 39-bus system and a real 2778-bus system to demonstrate the effectiveness of the proposed *** Terms-Rolling security-constrained unit com-mitment,approximate dynamic programming,decision transfer,probability-based decision priority criterion,uncertainty.

关键词： Rolling security-constrained unit com-mitment approximate dynamic programming decision transfer probability-based decision priority criterion uncertainty

General theory for designing phonon transport in alloyed/doped materials

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Chenhan liu Chao Wu Wei liu Yunshan Zhao Gang zhang Hongmin Yang Yunfei Chen Micro-and Nano-scale Thermal Measurement and Thermal Management Laboratory Key Laboratory of Numerical Simulation for Large Complex Systems Ministry of Education School of Energy and Mechanical Engineering Nanjing Normal University School of Electrical and Automation Engineering Nanjing Normal University Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy Science Institute of Physics Frontiers and Interdisciplinary Sciences School of Physics and Technology Nanjing Normal University Institute of High-Performance Computing Agency for Science Technology and ResearchSingapore Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical Engineering Southeast University

Alloying/doping is a widely used technique for improving the electrical, mechanical, and optical properties of ***, this technology induces significant distortions in the lattice structure, mass distribution, and potential field, greatly enhancing phonon scattering. Here, we introduce the concept of alloying/doping path and employ crystal symmetry, lattice deformation, and electron distribution to characterize it. Based on this new concept, the phonon thermal transport behavior in alloyed/doped materials can be well designed, and along different alloying/doping paths, the difference in thermal conductivity can be up to 45 times. On one hand, strategic alloying/doping that combines high crystal symmetry, large lattice contraction, and the same electron distribution suppresses phonon-phonon scattering phase space, induces phonon stiffening, and bolsters electronic structure symmetry, respectively. These synergistic effects significantly improve thermal conductivity. On the other hand, random alloying/doping has a low symmetry, leading to the typical “U” shape of alloying/doping level-dependent thermal conductivity. Our theory is corroborated in three-dimensional（3D） Si, 2D MoS2, and quasi-1D TiS3, affirming its efficacy and broad applicability in controlling phonon transport.

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Dopamine Inhibits the Expression of Hepatitis B Virus Surface and e Antigens by Activating the JAK/STAT Pathway and Upregulating Interferon-stimulated Gene 15 Expression

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Journal of Clinical and Translational Hepatology 2024年第5期12卷 443-456页

作者： Xiaoquan liu Xiuqing Pang Zhiping Wan Jinhua Zhao Zhiliang Gao Hong Deng Department of Infectious Diseases Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdongChina Guangdong Key Laboratory of Liver Disease Research Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou GuangdongChina Key Laboratory of Tropical Disease Control(Sun Yat-sen University) Ministry of EducationGuangzhouGuangdongChina

Background and Aims:Hepatitis B virus(HBV)infection is a major risk factor for cirrhosis and liver cancer,and its treatment continues to be *** previously demonstrated that a dopamine analog inhibited the packaging of pregenomic RNA into *** present study aimed to determine the effect of dopamine on the expressions of hepatitis B virus surface and e antigens(HBsAg and HBeAg,respectively)and to elucidate the underlying ***:We used dopamine-treated HBVinfected HepG2.2.15 and NTCP-G2 cells to monitor HBsAg and HBeAg expression *** analyzed interferon-stimulated gene 15(ISG15)expression in dopamine-treated *** knocked down ISG15 and then monitored HBsAg and HBeAg expression *** analyzed the expression of Janus kinase(JAK)/signal transducer and activator of transcription(STAT)pathway factors in dopamine-treated *** used dopamine hydrochloride-treated adeno-associated virus/HBV-infected mouse model to evaluate HBV DNA,HBsAg,and HBeAg *** virus was collected from HepAD38.7 cell culture ***:Dopamine inhibited HBsAg and HBeAg expression and upregulated ISG15 expression in HepG2.2.15 and HepG2-NTCP cell ***15 knockdown increased HBsAg and HBeAg expression in HepG2.2.15 ***-treated cells activated the JAK/STAT pathway,which upregulated ISG15 *** the adeno-associated virus-HBV murine infection model,dopamine downregulated HBsAg and HBeAg expression and activated the JAK-STAT/ISG15 ***:Dopamine inhibits the expression of HBsAg and HBeAg by activating the JAK/STAT pathway and upregulating ISG15 expression.

关键词： Hepatitis B virus Dopamine JAK-STAT/ISG15 axis HBV surface antigen HBV e antigen HepG2.2.15 cell line Human NTCP-expressing HepG2 cell line HepAD38 cell line

Highly Accurate Golden Section Search Algorithms and Fictitious Time Integration Method for Solving Nonlinear Eigenvalue Problems

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1317-1335页

作者： Chein-Shan liu Jian-Hung Shen Chung-Lun Kuo Yung-Wei Chen Center of Excellence for Ocean Engineering Taiwan Ocean UniversityKeelung202301TaiwanChina Department of Marine Engineering Taiwan Ocean UniversityKeelung202301TaiwanChina

This study sets up two new merit functions,which are minimized for the detection of real eigenvalue and complex eigenvalue to address nonlinear eigenvalue *** each eigen-parameter the vector variable is solved from a nonhomogeneous linear system obtained by reducing the number of eigen-equation one less,where one of the nonzero components of the eigenvector is normalized to the unit and moves the column containing that component to the right-hand side as a nonzero input vector.1D and 2D golden section search algorithms are employed to minimize the merit functions to locate real and complex ***,the real and complex eigenvectors can be computed very accurately.A simpler approach to the nonlinear eigenvalue problems is proposed,which implements a normalization condition for the uniqueness of the eigenvector into the eigenequation *** real eigenvalues can be computed by the fictitious time integration method(FTIM),which saves computational costs compared to the one-dimensional golden section search algorithm(1D GSSA).The simpler method is also combined with the Newton iterationmethod,which is convergent very *** the proposed methods are easily programmed to compute the eigenvalue and eigenvector with high accuracy and efficiency.

关键词： Nonlinear eigenvalue problem quadratic eigenvalue problem two new merit functions golden section search algorithm fictitious time integration method

Water and nitrogen footprint assessment of integrated agronomic practice management in a summer maize cropping system

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Journal of Integrative Agriculture 2024年第10期23卷 3610-3621页

作者： Ningning Yu Bingshuo Wang Baizhao Ren Bin Zhao Peng liu Jiwang zhang State Key Laboratory of Crop Biology and College of Agronomy Shandong Agricultural UniversityTai’an 271018China

The footprints of water and nitrogen(WF and NF)provide a comprehensive overview of the type and quantity of water consumption and reactive nitrogen(Nr)loss in crop *** this study,a field experiment over two years(2019 and 2020)compared three integrated agronomic practice management(IAPM)systems:An improved management system(T2),a high-yield production system(T3),and an integrated soil-crop management system(ISCM)using a local smallholder farmer’s practice system(T1)as control,to investigate the responses of WF,Nr losses,water use efficiency(WUE),and nitrogen use efficiency(NUE)to *** results showed that IAPM optimized water distribution and promoted water use by summer *** evapotranspiration over the whole maize growth period of IAPM increased,but yield increased more,leading to a significant increase in *** WUE of the T2,T3,and ISCM treatments was significantly greater than in the T1 treatment,in 2019 and 2020respectively,by 19.8-21.5,31.8-40.6,and 34.4-44.6%.The lowest WF was found in the ISCM treatment,which was 31.0%lower than that of the T1 *** addition,the ISCM treatment optimized soil total nitrogen(TN)distribution and significantly increased TN in the cultivated *** nitrogen fertilizer was applied in treatment T3,producing the highest maize yield,and resulting in the highest Nr *** contrast,the ISCM treatment used a reduced nitrogen fertilizer rate,sacrificing grain yield partly,which reduced Nr losses and eventually led to a significant increase in nitrogen use efficiency and nitrogen *** Nr level in the ISCM treatment was34.8%lower than in the T1 treatment while NUE was significantly higher than in the T1 treatment by 56.8-63.1%in2019 and 2020,*** yield,WUE,NUE,WF,and NF together,ISCM should be used as a more sustainable and clean system for sustainable production of summer maize.

关键词： integrated agronomic practice management water footprints nitrogen footprints water use efficiency nitrogen use efficiency yield

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Study on Spray and Combustion Characteristics of F-T Diesel Blending Oxygenated Fuel Based on Constant Volume Combustion Chamber

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Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Limin Geng Yang Zhao Fujia liu Shiyu Shan Nan Gao Zhao liu Hao Chen Shaanxi Key Laboratory of New Transportation Energy and Automotive Energy Saving， Chang'an University Research Institute of Highway Ministry of Transport

In this work， 20% of PODE and n-butanol are blended with F-T diesel by volume， respectively，referred to as FFP20 and FBU20. Based on the constant volume combustion chamber (CVCC)， the spray characteristics and combustion characteristics of diesel， F-T diesel， FP20 and FBU20 under high ambient temperature and pressure are studied by using high-speed photography combined with MATLAB image processing technology. Results show that the steady-state liquid spray tip penetration and spray projection area of FP20 and FBU20 are smaller than those of F-T diesel due to their good evaporation. Combustion characteristics studies show that compared to D100， the ignition delay and flame lift-off length of FT100 decrease by 22.9% and 43.6%， respectively. Compared to FT100， the flame lift-off length of FP20 and FBU20 increases by 36.8% and 44.1%， respectively. Due to the addition of high cetane number and high oxygen content PODE， the ignition delay of FP20 is shortened by 3.7%， and the ignition delay of FBU20 is prolonged by 40.1% due to the effect of high latent heat of vaporization and low cetane number of n-butanol. Compared to D100， the peak flame area of FT100 increases by 8.5%， while the peak flame luminosity decreases by 18.2%. Because PODE and n-butanol can improve evaporation and increase the oxygen content of fuel and then reduce the formation of soot， compared to FT100， the peak of flame area and flame luminosity of FP20 and FBU20 are decreased. The results of two-color method show that after adding PODE and n-butanol into F-T diesel fuel， the generation of soot and combustion temperature of the mixed fuel are reduced. Moreover， FP20 has higher oxygen content and better atomization characteristics， so the effect of reducing soot is better than that of FBU20.

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Coordinated Voltage Control of Distribution Network ConsideringMultiple Types of Electric Vehicles

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Energy Engineering 2024年第2期121卷 377-404页

作者： Liang liu Guangda Xu Yuan Zhao Yi Lu Yu Li Jing Gao State Grid Jibei Electric Power Research Institute(North China Electric Power Research Institute Co. Ltd.)Beijing100045China

The couple between the power network and the transportation network(TN)is deepening gradually with the increasing penetration rate of electric vehicles(EV),which also poses a great challenge to the traditional voltage control *** this paper,we propose a coordinated voltage control strategy for the active distribution networks considering multiple types of *** the first stage,the action of on-load tap changer and capacitor banks,etc.,are determined by optimal power flow calculation,and the node electricity price is also determined based on dynamic time-of-use tariff *** the second stage,multiple operating scenarios of multiple types of EVs such as cabs,private cars and buses are considered,and the scheduling results of each EV are solved by building an optimization model based on constraints such as queuing theory,Floyd-Warshall algorithm and traffic flow *** the third stage,the output power of photovoltaic and energy storage systems is fine-tuned in the normal control *** charging power of EVs is also regulated in the emergency control mode to reduce the voltage deviation,and the amount of regulation is calculated based on the fair voltage control mode of ***,we test the modified IEEE 33-bus distribution system coupled with the 24-bus Beijing *** simulation results show that the proposed scheme can mitigate voltage violations well.

关键词： Electric vehicle transportation network voltage control queuing theory

基于随机森林优化算法的城市群洪涝灾害韧性时空演变研究

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防灾减灾工程学报 2024年第4期44卷 784-791页

作者：孟晓静刘超曹莹雪田占陈磊西安建筑科技大学资源工程学院陕西西安710055 西部绿色建筑国家重点实验室陕西西安710055

为了提升城市应对灾害的能力,对城市洪涝灾害韧性进行研究。基于“驱动力-状态-响应(DSR)”模型建立城市洪涝灾害韧性评估指标体系,采用随机森林优化算法(RF)构建城市洪涝灾害韧性评估模型,通过均方根误差(RMSE)和决定系数(R2)评价模型... 详细信息

为了提升城市应对灾害的能力,对城市洪涝灾害韧性进行研究。基于“驱动力-状态-响应(DSR)”模型建立城市洪涝灾害韧性评估指标体系,采用随机森林优化算法(RF)构建城市洪涝灾害韧性评估模型,通过均方根误差(RMSE)和决定系数(R2)评价模型性能。以关中平原城市群为例,分析西安、宝鸡、咸阳、商洛、铜川、渭南、临汾、运城、平凉、天水、庆阳等11座城市2011~2020年的城市洪涝灾害韧性时空演变规律。结果表明:驱动力和状态对城市洪涝灾害韧性水平影响较大,响应对城市洪涝灾害韧性水平影响较小;在时间序列上,关中平原城市群各城市洪涝灾害韧性水平发展存在较大差异,但整体处于平稳上升的状态,其中铜川的城市洪涝灾害韧性水平提升最为明显;在空间格局上,城市群洪涝灾害韧性水平呈现出由核心城市向外围递减的空间结构特征,各城市的洪涝灾害韧性等级的空间分布存在不均衡的现象。研究结果可为关中平原城市群韧性城市建设提供指导。

关键词：城市洪涝灾害韧性时空演变 DSR模型随机森林算法

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Potential Benefits of Green Tea in Prostate Cancer Prevention and Treatment: A Comprehensive Review

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Chinese Journal of Integrative Medicine 2024年第11期30卷 1045-1055页

作者： liu Gui-hong YAO Ze-qin CHEN Guo-qiang LI Ya-lang LIANG Bing Department of Urology Sanya Central Hospital (The Third People's Hospital of Hainan Province) Department of Urology Yuzhou People's Hospital

Prostate cancer is a prevalent and debilitating disease that necessitates effective prevention and treatment strategies. Green tea, a well-known beverage derived from the Camellia sinensis plant, contains bioactive compounds with potential health benefits, including catechins and polyphenols. This comprehensive review aims to explore the potential benefits of green tea in prostate cancer prevention and treatment by examining existing literature. Green tea possesses antioxidant, anti-inflammatory, and anti-carcinogenic properties attributed to its catechins, particularly epigallocatechin gallate. Epidemiological studies have reported an inverse association between green tea consumption and prostate cancer risk, with potential protection against aggressive forms of the disease. Laboratory studies demonstrate that green tea components inhibit tumor growth, induce apoptosis, and modulate signaling pathways critical to prostate cancer development and progression. Clinical trials and human studies further support the potential benefits of green tea. Green tea consumption has been found to be associated with a reduction in prostate-specific antigen levels, tumor markers, and played a potential role in slowing disease progression. However, challenges remain, including optimal dosage determination, formulation standardization, and conducting large-scale, long-term clinical trials. The review suggests future research should focus on combinatorial approaches with conventional therapies and personalized medicine strategies to identify patient subgroups most likely to benefit from green tea interventions.

关键词： epigallocatechin gallate green tea prevention prostate cancer review treatment