Results 41 to 50 of about 5,206 (171)

A Comparative Study on Financial Performance and Financial Policy between China Shipbuilding Industry Group Power Co., Ltd and Camel Group Co., Ltd [PDF]

open access: yes, 2016
2009年,中国汽车销量达到1364万辆,同年美国汽车销量1060万辆,中国首次超越美国成为世界第一汽车销售市场,汽车电池是汽车必不可少的储能配件。本论文基于“利润-现金-价值-风险-成长”的财务管理理念,以财务报表为基础,对中国动力和骆驼股份两家中国最大的起动用铅酸电池厂家的财务绩效和财务政策进行比较研究,为利益相关者的决策提供依据。 本论文共8章,第一章为研究概述。第二章为行业分析。第三章为公司情况。第四章通过财务报表三维分析来分析财务状况的结构和趋势。第五章中运用五大类财务比率指标 ...
陈榴信
core  

Dual‐Stage Heat Treatment for Enhanced Hydrogen Storage Properties of Mg−Ni−Y Alloys

open access: yesRare Metals, EarlyView.
ABSTRACT Mg−Ni−Y alloy is considered to be one of the most promising hydrogen storage materials, but its high dehydrogenation energy barrier hinders its practical application. A dual‐stage heat treatment (490°C × 4 h + 550°C × 4 h) is applied to optimize the microstructure and hydrogen storage performance of a vacuum‐melted Mg94Ni3Y3 alloy.
You Lv   +6 more
wiley   +1 more source

面向并联环流最小化的垂直式矩阵型重力储能系统多机协调控制 [PDF]

open access: yes全球能源互联网
重力储能利用高度落差对固体重物储能介质进行升降,实现储能系统的充放电。和抽水蓄能相比,由于其具有不依赖水资源、选址灵活等特点,应用前景广泛。为提高重力储能系统的充放电运行效率,研究了面向多机并联功率环流最小化的垂直式矩阵型重力储能系统多机协调控制问题。首先,基于PSCAD/EMTDC构建垂直式矩阵型重力储能系统模型,分析了其充放电特性;其次,通过对重力储能系统多机并联运行时产生的机组间功率环流机理及抑制问题进行分析,提出了基于重力储能系统双层控制架构的多个机组间协调控制方法 ...
翟文超   +6 more
doaj   +1 more source

Oxygen Vacancy Engineering of Ultrafine ZnAl2O4 Nanoparticles as a Robust Protective Layer for Dendrite‐Free and Long‐Lifespan Aqueous Zn Metal Anodes

open access: yesRare Metals, EarlyView.
ABSTRACT Aqueous zinc‐ion batteries (AZIBs) hold great promise for safe and sustainable energy storage, but their commercialization is impeded by severe Zn dendrite growth and interfacial instability. To address these challenges, we propose a defect engineering strategy employing ultrafine ZnAl2O4 (ZAO) nanoparticles (∼5 nm) with oxygen vacancy defects
Yilun Ren   +9 more
wiley   +1 more source

分布式发电中的储能技术

open access: yesGaoya dianqi, 2003
简要介绍了分布式发电的现状,分析了储能在分布式发电中的作用。着重介绍了蓄电池储能、超导储能、超级电容器储能以及飞轮储能等储能形式,并分析了它们的技术现状及优缺点。
程华, 徐政
doaj  

Theoretical calculation of cathode catalyst and electrolyte in lithium air battery [PDF]

open access: yes, 2016
随着电动汽车的快速发展,寻找和开发具有高能量密度的新型锂二次电池显得至关重要,锂空气电池是目前研究最为活跃的体系之一。采用量子化学为主的理论方法,有助于深入认识和理解锂空气电池电化学界面的一些关键科学问题。本文从理论计算的角度出发,开展对于锂空气电池的正极催化剂材料及电解液等关键组件的研究。主要研究内容如下: 1.MnO晶体的(100)、(111)-Mn和(111)-O晶面对锂空气电池充放电过电势影响的机理研究。 在N掺杂石墨烯(NG)表面上均匀生长MnO晶体,该复合材料表现出了优异的OER催化性能 ...
雷鸣
core  

Ionic‐Liquid‐Assisted Synthesis of NiTe/CoTe Heterostructure With Te Vacancies in N, P, and F Co‐Doped Hollow Carbon Nanorods for Efficient Alkaline Hydrogen Evolution and High‐Performance Flexible Supercapacitors

open access: yesRare Metals, EarlyView.
ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi   +7 more
wiley   +1 more source

Study and Design of V2G system based on Grid-connected PV Power Generation [PDF]

open access: yes, 2016
随着分布式可再生能源渗透率的不断提高,光伏等可再生能源接入电网的方式更加多样。同时近年来电动汽车飞速发展,解决充电问题已成为当务之急。在减少大规模充电对电网产生影响的同时,将电动汽车作为储能单元参与电网的调峰调频有利于电网的安全经济运行。本文研究基于光伏发电的V2G系统,旨在增加新能源消纳并促进电动汽车的清洁化和低碳化。系统的最大创新点在于实现了光伏发电并网、电动汽车充电与V2G服务的分时复用。 针对家庭单相并网选取了双向两级式的电路拓扑,不仅结构简单而且易于控制。对双向全桥电路和Buck ...
孙纯鹏
core  

From Microstructure to Macroscopic Performance: A Comprehensive Study on Low‐K Oxide‐Doped BNT–LST–NN Ceramics for Energy Storage

open access: yesRare Metals, EarlyView.
ABSTRACT Dielectric ceramics are popular for energy storage materials because of their rapid charge–discharge characteristics, whereas their low energy density and efficiency hinder their miniaturization and integration. In this work, the energy storage performance is significantly enhanced through introducing Al2O3 and TiO2 into the 0.425(Bi0.5Na0.5 ...
Qiansi Zhang   +9 more
wiley   +1 more source

全球新型储能技术发展态势分析 [PDF]

open access: yes全球能源互联网
在落实“碳达峰、碳中和”目标过程中,储能对支撑以新能源为主体的新型电力系统负荷平衡起到重要作用,新型储能技术因建设周期短、选址灵活性高、调节能力强等优势受到更多关注。对比梳理了美国、欧盟、日本等主要国家/地区新型储能技术战略规划布局情况。针对新型储能技术中锂离子电池、钠离子电池、液流电池、金属空气电池、压缩空气储能、重力储能六大技术方向,利用文献计量和专利计量方法深度挖掘分析了国内外在该领域的前沿主题与创新能力。结果显示,中国在新型储能技术领域研发创新能力整体较强。从论文成果统计来看 ...
汤匀   +4 more
doaj   +1 more source

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