Results 81 to 90 of about 12,184 (174)

Synthesis and Modification of LiNixCoyMnzO2 Cathode Material for Li-ion Batteries [PDF]

open access: yes, 2015
LiNixCoyMnzO2正极材料因兼具镍酸锂、钴酸锂和锰酸锂的优点,具有容量较高、热稳定好、价格较低和环境污染小等优点,被认为是最有可能取代钴酸锂的新型正极材料之一。如何让LiNixCoyMnzO2正极材料在拥有更高能量密度的同时拥有更好的电化学性能和热稳定性是目前的研究热点之一。 本论文选取低Co含量的LiNi1/3Co1/3Mn1/3O2和LiNi0.5Co0.2Mn0.3O2为主要研究对象。采用共沉淀结合高温烧结法,优化一系列实验条件合成类球形LiNi1/3Co1/3Mn1/3O2正极材料 ...
蔡济钧
core  

生物炭对水稻-再生稻体系吸收土壤中Cd和Pb的影响

open access: yesShuitu Baochi Xuebao, 2020
以矿区周边Cd—Pb复合污染的农田土壤为供试材料,设置0,2.5%和5%(w/w)3个生物炭添加处理,通过盆栽试验探讨生物炭对再生稻吸收土壤中Cd和Pb的影响。结果表明,生物炭施加提高土壤pH和有机质含量,使Cd和Pb从移动性较强的弱酸提取态转化为较稳定的可还原态,且土壤CaCl2提取的有效态Cd和Pb含量分别降低33.23%~53.23%和66.52%~91.45%。同时,生物炭抑制Cd在头季和再生季水稻叶到糙米中的迁移,降低Pb从茎到叶和糙米的迁移,从而减少Cd和Pb在糙米中的累积;在5 ...
李荭荭   +5 more
doaj  

Constraints on timing of the early-paleoproterozoic magmatism and crustal evolution of the Oulongbuluke microcontinent: U-Pb and Lu-Hf isotope systematics of zircons from Mohe granitic pluton [PDF]

open access: yes, 2007
The Olongbuluke micro-continent is composed of a two-fold basement with cover strata. The lower basement is the medium-to high-grade Delingha complex (DC) and the Dakendaban Group, the upper is the low-grade Wandonggou Group.
Chen, N   +6 more
core  

Slackline no CIEJA: não é para melhorar o equilíbrio, é porque é...

open access: yesConexões, 2018
Contrariando a visão hegemônica que concebe a Educação Física na Educação de Jovens e Adultos como experiência formativa irrelevante ou destinada simplesmente a exercitar e relaxar os corpos com vistas a compensar os esforços laborais da população trabalhadora, relatamos uma experiência pedagógica realizada num Centro Integrado de Educação de Jovens e ...
Jacqueline Cristina Jesus Martins   +1 more
openaire   +2 more sources

湖北省罗田凤凰关混合岩浅色体的类型及其锆石U-Pb年龄 [PDF]

open access: yes, 1997
Based on the principle of refolding transecting and overprinting, and eliminating the refolding pseudomorph resulting from the effect of viscous folds, 8-generation leucosomes have been distinguished in the Fenghuangguan migmatites in Luotian, Hubei ...
Chang, XY, Deng, SX, Sun, M, Wang, JH
core  

脑小血管病患者运动功能及影像特征与运动诱发电位的相关性研究

open access: yesZhongguo cuzhong zazhi, 2020
黄莹,苏晓琳,王倩,张亚青,韩晶,陈思言,付学军,徐铅辉,郭毅
doaj   +1 more source

北碚区菜地规划区内不同土地利用方式下土壤铅、镉研究

open access: yesShuitu Baochi Xuebao, 2011
通过野外采样、室内测试及数理统计,对北碚区菜地规划区内前期不同土地利用方式下土壤的铅、镉进行研究。结果表明:(1)通过描述统计与方差分析得出不同土地利用方下铅和镉全量、有效态含量、生物有效性系数有不同程度的差异,土地利用方式对其有不同程度的影响。(2)在研究区内,车辆废气排放、肥料施用的差异是影响全量差异的可能因素,土壤pH值的差异、有效磷含量差异、铅与镉全量的差异是影响有效态含量差异的可能因素。全量的差异是影响生物有效性系数差异的主要因素。(3)以重庆市土壤铅、镉背景值为标准 ...
袁波   +4 more
doaj  

Experimental investigation of Phase Equilibria of Partial Ternary systems with Rhenium [PDF]

open access: yes, 2016
摘要 镍基高温合金具有高强度、优良的耐热性和良好的耐腐蚀性,被广泛应用于航空航天、国防军事、核能等重要领域。迄今为止,镍基高温合金的添加元素达到了十多种,熔点高、原子半径大的元素如Co,Re,Ru,Mo,W等的添加,能起到很好的固溶强化作用,改善高温力学性能。然而高熔点元素的过量添加导致拓扑密排相的产生,降低镍基高温合金的疲劳寿命、塑性、韧性等力学性能。相图作为合金设计的基础,能够很好的指导镍基高温合金的成分设计。然而,由于Re,Ru,W等元素价格贵,熔点高,对其进行实验研究比较困难。截至目前,由Co ...
杨晓锋
core  

Lembrar é fácil, difícil é esquecer

open access: yesEXILIUM Revista de Estudos da Contemporaneidade
This article discusses Palestinian memories and exiles due to migration. Six Brazilian-Palestinian women exercise their right to narrate their experiences and record their individual memories. Connected by the Nakba, these memories are also collective.
Ashjan Sadique Adi   +2 more
openaire   +1 more source

Tamanho é documento

open access: yesARS (São Paulo), 2017
Este texto, publicado na revista Critical Inquiry, em 2000, aborda as relações entre o Minimalismo e a arte contemporânea. O autor propõe a análise daquilo que entende como uma retórica da Arte Minimalista, vinculada a uma ideologia da pureza do espaço e da forma e a uma noção de transcendência que encontram seus antecedentes, em parte, no Puritanismo.
openaire   +4 more sources

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