检索结果-南通市图书馆

基于改进遗传算法的主动配电网优化定价策略研究

在线全文

学校读者我要写书评

暂无评论

电测与仪表 2024年第7期61卷 116-122页

作者：谢虎杨占杰张伟何超林谢型浪潘睿南方电网数字电网研究院有限公司广州510670 南方电网深圳数字电网研究院有限公司广东深圳518000

由于传统的主动配电网优化定价策略没有设置等式和不等式约束条件,使电力定价超过设定的最高限值,降低了定价效率,基于此,研究了一种基于改进遗传算法的主动配电网优化定价策略。首先将最优的机组有功费用和无功费用作为目标建立目标函... 详细信息

由于传统的主动配电网优化定价策略没有设置等式和不等式约束条件,使电力定价超过设定的最高限值,降低了定价效率,基于此,研究了一种基于改进遗传算法的主动配电网优化定价策略。首先将最优的机组有功费用和无功费用作为目标建立目标函数,即定价优化策略模型,然后设置其等式约束条件和不等式约束条件,使电力定价不超过设定的最高限值,最后在约束条件下利用改进后的遗传算法对最优定价策略模型进行求解,获取最优定价。实验结果表明,所研究方法在大于设定的价格下限0.5元/(kW·h)的基础上,定价更高一点,基于电力企业角度,说明所研究方法优化后的主动配电网定价更为合理,并且定价效率较高。

关键词：线性化最优潮流主动配电网电力价格优化策略改进遗传算法

在线全文

学校读者我要写书评

暂无评论

ESG信息披露与企业价值提升

盐城工学院学报（社会科学版） 2024年第2期37卷 40-45页

作者：夏克礼何朝林安徽工程大学数理与金融学院安徽芜湖241000

在ESG理念下,企业长期价值的增加取决于其环境价值、社会价值与治理能力的全方位提升,但源于理念认知和目标取向的差异性,企业在ESG实践中仍存在较多权衡问题和发展困境。基于ESG理念发展逻辑,选取沪深A股2010—2020年所有上市公司为研... 详细信息

在ESG理念下,企业长期价值的增加取决于其环境价值、社会价值与治理能力的全方位提升,但源于理念认知和目标取向的差异性,企业在ESG实践中仍存在较多权衡问题和发展困境。基于ESG理念发展逻辑,选取沪深A股2010—2020年所有上市公司为研究样本,实证检验ESG信息披露助力企业价值增值的作用路径。结果表明,良好的ESG信息披露显著提升企业价值;ESG信息披露能够通过提高机构投资者持股比例、提高雇员质量和增加创新投入促进企业价值提升。异质性分析发现,在高度法治化程度地区、高多元化经营行业、强外部监督环境,ESG信息披露促进企业价值提升的效果更明显。研究指出,通过“渐进式变革”提高市场与企业ESG认知水平,解构ESG发展理念,从而实现企业价值创造方式转型和可持续发展。

关键词： ESG信息披露企业价值提升中介效应调节效应

基于多区域全分布算法的主动配电网动态经济调度方法

在线全文

学校读者我要写书评

暂无评论

电测与仪表 2024年第8期61卷 143-149,156页

作者：杨占杰谢虎张伟何超林谢型浪宋学清南方电网数字电网研究院有限公司广州510670 南方电网深圳数字电网研究院有限公司广州510670

由于传统方法在进行主动配电网动态经济调度过程中,没有对目标函数内状态变量存在的越界情况进行处理,主动配电网电压超越上限,从而导致调度效果不佳,因此,提出基于多区域全分布算法的主动配电网动态经济调度方法。利用多区域全分布算... 详细信息

由于传统方法在进行主动配电网动态经济调度过程中,没有对目标函数内状态变量存在的越界情况进行处理,主动配电网电压超越上限,从而导致调度效果不佳,因此,提出基于多区域全分布算法的主动配电网动态经济调度方法。利用多区域全分布算法实施机会约束规划,根据规划结果,建立对应的多目标模型,通过罚函数形式对目标函数内状态变量存在的越界情况进行处理,避免主动配电网电压超越上限,使电压在上限之内。根据柴油机发电爬坡方面、线路传输方面、主网与区域配电网最大交互传输功率方面和储能单元方面,通过蒙特卡罗模拟方法对经济调度时的约束条件进行选取,改进传统粒子群算法,并利用改进结果对模型进行求解,从而实现动态性经济调度的目的。仿真实验结果表明,该方法的调度结果是有效、动态的,并且调度精度较高,调度时间较短,适用于主动配电网的光伏与风电等的调度,继续精进后有良好的应用前景。

关键词：多区域全分布算法目标函数燃料成本动态经济调度分布式电源主动配电网

在线全文

学校读者我要写书评

暂无评论

投资者收益外推行为与股票错误定价

安徽工程大学学报 2024年第3期39卷 76-85页

作者：唐良玲高艺嘉何朝林安徽工程大学经济与管理学院安徽芜湖241000

以2000-2021年沪深A股上市公司股票数据为样本,研究投资者收益外推行为与股票错误定价的关系,进一步探讨投资者不同程度的收益外推行为对股票错误定价影响的差异性及经济状态的调节效应。研究发现,投资者收益外推行为助推了股票错误定价... 详细信息

以2000-2021年沪深A股上市公司股票数据为样本,研究投资者收益外推行为与股票错误定价的关系,进一步探讨投资者不同程度的收益外推行为对股票错误定价影响的差异性及经济状态的调节效应。研究发现,投资者收益外推行为助推了股票错误定价;投资者外推收益率的赋权越大,对股票错误定价的影响也越强;经济状态对投资者收益外推行为与股票错误定价的关系有调节作用,特别是在经济上行期时,经济状态推动了投资者收益外推行为,导致股票高估程度更大,而又变相缓解了股票价值的低估程度。研究不但丰富了资产定价理论,而且为金融市场稳定发展提供了经验证据。

关键词：投资者收益外推行为外推收益率股票错误定价经济状态

A modified 3D mean strain energy density criterion for predicting shale mixed-mode Ⅰ/Ⅲ fracture toughness

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2411-2428页

作者： Kun Zheng chaolin Wang Yu Zhao Jing Bi Haifeng Liu College of Civil Engineering Guizhou UniversityGuiyang550025China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The fracture toughness of rocks is a critical fracturing parameter in geo-energy exploitation playing a significant role in fracture mechanics and hydraulic *** edge-notched disk bending(ENDB)specimens are employed to measure the entire range of mixed-modeⅠ/Ⅲfracture toughness of Longmaxi *** theoretically interpret the fracture mechanisms,this research first introduces the detailed derivations of three established fracture *** distinguishing the volumetric and distortional strain energy densities,an improved three-dimensional mean strain energy density(MSED)criterion is *** the critical volumetric to distortional MSED ratio decreases,the transition from tensiondominated fracture to shear-dominated fracture is *** results indicate that both peak load and applied energy increase significantly with the transition from pure mode I(i.e.,tension)to pure modeⅢ(i.e.,torsion or tearing)since mode-Ⅲcracking happens in a twisted manner and mode-Ⅰcracking occurs in a coplanar *** macroscopic fracture signatures are consistent with those of triaxial hydraulic *** average ratio of pure mode-Ⅲfracture toughness to pure mode-Ⅰfracture toughness is 0.68,indicating that the obtained mode-Ⅲfracture resistance for a tensionbased loading system is apparent rather than *** to the three mainstream fracture criteria,the present fracture criterion exhibits greater competitiveness and can successfully evaluate and predict mixed-modeⅠ/Ⅲfracture toughness of distinct materials and loading methods.

关键词： Longmaxi shale Hydraulic fracturing Fracture mechanisms Fracture criteria Mixed-modeⅠ/Ⅲfracture toughness Edge-notched disk bending

NMR-based analysis of the effect of moisture migration on sandstone pore structure under alternating wetting and drying conditions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2024年第8期34卷 1135-1150页

作者： Huasu Wang Jing Bi Yu Zhao chaolin Wang Jiabao Ma College of Civil Engineering Guizhou UniversityGuiyang 550025China

The wetting-drying(W-D)cycle is a type of water–rock *** pore structure of rock,such as shape,size,distribution and pore throat,affects fluid storage and *** theory and experimental research on the evolution characteristics of pore damage during the wet-dry erosion process are highly important for determining W-D *** mass and velocity of liquid migration are related to the pore size,porosity,fluid properties,*** data show that the water absorption quality and velocity in rocks decrease with the number of wet-dry *** the same test time,the mass and velocity of the SI water absorption method are smaller than those of the FI *** these two conditions,the amount and rate of water absorption represent the degree of water–rock *** the pore evolution during the wet-dry cycling,an equation describing the motion of liquid in porous media was derived based on the imbibition-type separation *** experimental data are in excellent agreement with the calculated values of the *** characteristics can affect the area and degree of rock deterioration as well as the development rate of pores and *** on the interaction between permeability and pores,quantitative analysis of the weakening process(local damage)of rocks under W-D cycles can provide good reference indicators for evaluating the stability of geotechnical engineering.

关键词： W-D cycle Capillary absorption Pore characteristic Fractal theory Dynamic damage model

Numerical Study of Flow Features Around Submerged Circular and Square Piles at Flat and Scoured Beds Using OpenFOAM

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第4期23卷 897-914页

作者： WANG chaolin WU Guoxiang WANG Dianhe DU Shengtao ZHANG Zhiyong JIN heng ZHU David Z. LIANG Bingchen Donghai Academy School of Civil&Environmental Engineering and Geography ScienceNingbo UniversityNingbo 315211China Key Laboratory of Estuary and Coast of Zhejiang Province and Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020China Shandong Provincial Key Laboratory of Ocean Engineering and College of EngineeringOcean University of ChinaQingdao 266100China Shandong Water Conservancy Vocational College Rizhao 276826China School of Mechanical and Energy Engineering Ningbotech UniversityNingbo 315211China

Elucidating the flow features around piles in local scouring processes is crucial for studies of local scouring mechanisms and scour depth *** study details the flow turbulence characteristics of two submerged piles that are determined by solving the Navier-Stokes equations with the improved delayed detached eddy simulation *** model is verified by comparing experimental and numerical results for hydrodynamic parameters with the literature for both square-crossing piles(SCPs)and circular-crossing piles(CCPs).Original topographies of flat and scoured beds(i.e.,the initial and equilibrium scouring stages)are based on experimental results obtained by the authors in the present *** and CCP flow features in the scouring process are *** results indicate that during the scouring process,the time-averaged drag coefficient and root mean square(rms)of the lift coefficient increase linearly in the CCP test,while the rms of the lift coefficient in the SCP test decreases ***,the minimum pressure coefficient is always located in the upstream corners in the SCP case but moves from 72.5°to 79.5°when the scour hole is completely developed in the CCP *** flow behind the pile,which is generated by separated boundary layers above the top face of the pile,can reach the sand bed and turn the separated shear layers into patches of small vortices in the near-wake ***,the high shear stress zones are mainly at the scour edges under scoured-bed conditions.

关键词： flat bed scoured bed local scour OpenFOAM bed shear stress

Iron-induced NaTi（PO）with regulated electronic structure enables freshwater harvesting based on rocking-chair desalination battery

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： Yuliang Wu Chen Ling chaolin Li Wenhui Wang School of Civil and Environmental Engineering Harbin Institute of Technology School of Environment and Resources Taiyuan University of Science and Technology State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Despite the promising potential of NaTi2（PO4）3as desalination battery electrode,its mediocre seawater desalination capacity and durability fail to meet the requirements of practical ***,the substitution of Ti by Fe in NaTi2（PO4）3(NT2-xFxP),which possesses a stronger electronegativity relative to Ti,can regulate the electronic structure,thus facilitating charge transfer and ion diffusion during the desalination *** kinetic and thermodynamic facilitation of NT2-xFxP is clarified by the electrochemical analyses and DFT ***,the additional redox center and solid-solution reaction mechanism induced by Fe-dopant further contribute to a superior desalination performance of NT2-xFxP in different seawater *** from the multifunctional effect of Fe-dopant,the optimal NT1.7F0.3P delivers a large salt removal capacity(173.6 mg g-1) with an ultrahigh salt removal rate (8.48 mg g-1min-1),and maintains 96.6%of desalination capacity after 500cycles in natural ***,the assembled NT1.7F0.3P||NaFeHCF rocking-chair desalination battery （RCDB） demonstrates a higher desalination performance than that of reported RCDB systems,and can desalinate natural seawater to freshwater standards under continuous desalination mode for the first time in RCDB *** work provides a facile but effective strategy to modulate the electronic structure of NaTi2（PO4）3for RCDB,and exploits a new perspective for developing scalable RCDB devices for continuous desalinating real seawater to freshwater.

关键词：

Recent innovations in laser additive manufacturing of titanium alloys

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第3期6卷 2-37页

作者： Jinlong Su Fulin Jiang Jie Teng Lequn Chen Ming Yan Guillermo Requena Lai-Chang Zhang Y Morris Wang Ilya V Okulov Hongmei Zhu chaolin Tan College of Materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China Singapore Institute of Manufacturing Technology(SIM Tech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Institute of Materials Research German Aerospace Center(DLR)Linder Höhe51147 CologneGermany Centre for Advanced Materials and Manufacturing Edith Cowan University270 Joondalup DriveJoondalupPerthWestern Australia 6027Australia Department of Materials Science and Engineering University of CaliforniaLos AngelesCA 900095United States of America Leibniz Institute for Materials Engineering-IWT Badgasteiner Str.328359 BremenGermany Faculty of Production Engineering University of BremenBadgasteiner Str.128359 BremenGermany Key Laboratory of Hunan Province of Equipment Safety Service Technology under Extreme Environment University of South ChinaHengyangPeople’s Republic of China RWTH Aachen University Metallic Structures and Materials Systems for Aerospace EngineeringD-52062 AachenGermany

Titanium(Ti)alloys are widely used in high-tech fields like aerospace and biomedical *** additive manufacturing(LAM),as an innovative technology,is the key driver for the development of Ti *** the significant advancements in LAM of Ti alloys,there remain challenges that need further research and development *** recap the potential of LAM high-performance Ti alloy,this article systematically reviews LAM Ti alloys with up-to-date information on process,materials,and *** feasible solutions to advance LAM Ti alloys are reviewed,including intelligent process parameters optimization,LAM process innovation with auxiliary fields and novel Ti alloys customization for *** auxiliary energy fields(***,acoustic,mechanical deformation and magnetic fields)can affect the melt pool dynamics and solidification behaviour during LAM of Ti alloys,altering microstructures and mechanical *** kinds of novel Ti alloys customized for LAM,like peritecticα-Ti,eutectoid(α+β)-Ti,hybrid(α+β)-Ti,isomorphousβ-Ti and eutecticβ-Ti alloys are reviewed in ***,machine learning in accelerating the LAM process optimization and new materials development is also *** review summarizes the material properties and performance envelops and benchmarks the research achievements in LAM of Ti *** addition,the perspectives and further trends in LAM of Ti alloys are also highlighted.

关键词： additive manufacturing titanium alloys auxiliary field machine learning aerospace materials lightweight materials novel alloys