Results 31 to 40 of about 1,202,036 (168)

Application‐Grade TiAl Single Crystal With Excellent Room‐Temperature Plasticity and Strength Prepared by Seeded Electromagnetic Confinement Directional Solidification

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT In this study, a newly developed seeded electromagnetic confinement directional solidification (EMCDS) technique was employed to fabricate large‐scale TiAl single crystal ingots with a diameter of 32 mm, overcoming the long‐standing size limitations that have hindered their industrial application.
Wei Wang   +9 more
wiley   +1 more source

Cu‐Based Catalysts Design Toward Electrochemical CO2 Reduction to Valuable Multi‐Carbons Products

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Electrochemical reduction of CO2 to multi‐carbon products (e.g., C2+, ethene, ethanol, etc.) not only effectively decreases the CO2 concentration in atmosphere but also shows great potential economic benefits due to these exploitable value‐added products. The Cu‐based catalysts have caught much attention in CO2 electroreduction due to the good
Li‐Qing Li   +5 more
wiley   +1 more source

小麦新品种川育12产量构成及丰产稳产性分析

open access: yes, 1995
采用成对比较假设测验,通径分析及S•A•Eberhart—W•L•Russell方法,分析了小麦新品种川育12在四川、云南、贵州三省46个不同地点的产量、产量构成因素及其稳定性。结果表明:川育12属高产稳产型品种,增产潜力大.适应性广。产量与单位面积穗数、穗粒数、千粒重的多元回归方程为:y=-1968.150+195.063X1+45.240X2十24.408X3。单位面积穗数对产量的效应最大,偏相关系数r1y=0.8663,通径系数P01=0.9800,其次是穗粒数,偏相关系数及通径系数分别为0 ...
吴瑜
core  

根修剪对黄土旱塬冬小麦群体结构、土壤水分及产量形成的影响

open access: yesShuitu Baochi Xuebao, 2008
通过田间试验研究了返青期不同程度根修剪处理对冬小麦群体结构、土壤水分及产量形成的影响.结果表明,不同程度根修剪处理均减少了小麦的群体数量,改善了群体结构,从而使得根修剪处理花期时的透光率显著大于对照.根修剪处理还使小麦对土壤水分的消耗显著减少,花期时根修剪处理小区的土壤含水量均显著高于对照.土壤水分的改善促进了小麦的生理活性,使根修剪处理小麦的花期光合速率均显著大于对照.成熟期时小剪根处理对籽粒产量没有显著影响,但由于显著减少了水分消耗,因此,提高了小麦的水分利用效率 ...
马守臣   +4 more
doaj  

Pre‐Formation of LiF‐Rich Interfaces on Prelithiated Si/C Anodes for High‐Energy Lithium‐Ion Batteries

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Prelithiation is effective for compensating active lithium‐ion (Li+) loss in silicon (Si)‐based battery electrode materials. However, owing to the dynamic growth of the solid electrolyte interface (SEI), capacity fading remains the biggest challenge for the industrialization of Si electrodes.
Wen‐Jie He   +9 more
wiley   +1 more source

混合遗传算法在气田产量构成优化模型中的应用

open access: yes, 2006
在气田开发规划产量构成优化模型的基础上,引入一种单目标模型的改进遗传算法,把无约束优化中的直接解法Powell方法作为一个与选择、交叉和变异平行的算子嵌入到基本遗传算法中;并利用了一种新的退火精确罚函数法处理约束条件,运用MATLAB6.0编写算法程序,选取开发规划产量构成优化模型中的定成本产量最大模型,实例分析该算法在气田开发规划产量构成优化模型中的具体应用 ...
邓勇, 刘志斌, 凡哲元
core  

强力霉素生产中氢化产物的控制分析——薄层-比色法

open access: yes四川大学学报. 自然科学版, 1980
强力霉素(简称α-体)生产中氢化产物是较为复杂的.其中不仅有未反应的原料甲烯土霉素,而且还有副产物如强力霉素的差相异构体——β-强力霉素(简称β-体)和结构未知的氢化产物(生产上习称“前沿”).因此,氢化工艺中的耗氢量并不能反映α-体的产量.若采用强力霉素的成品分析法——生物效价法则因这些杂质不仅含量高,而且又有一定的生物活性,故使该法也不能应用.若采用薄层层折法检查,虽能查出这些杂质是否存在,但难于对α-体含量直接进行测定.为了掌握氢化进程 ...
邹文铨   +3 more
doaj  

Comparative Evaluation of Chemical and Physical Expansive Agents in Cemented Paste Backfill: Expansion Behavior, Mechanical Response, and Microstructural Mechanisms

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT This study presents an assessment of four representative expansive additives—calcium sulphoaluminate–calcium oxide, magnesium oxide, sodium lauryl sulfate, and sodium abietate—and their effects on the expansion behavior, mechanical development, and microstructural characteristics of cemented paste backfill (CPB).
Lijie Guo   +5 more
wiley   +1 more source

新疆科技论文专利成果产出分析研究

open access: yes, 2013
通过SCI、EI、 ISTP、CSCD等文献检索系统等数据对研究机构及科研人员学术成果进行统计分析,完成了: (1)十五年间主要科技论文产出时间、作者、机构、学科、期刊、发文类型、语种、作者国内外合作、论文影响力及变化分析; (2)1997-2006年科技专利产出的时间、作者、机构、学科及变化分析; (3)1997-2006年科技成果及获科技进步奖的时间、机构、学科、影响力及其变化统计分析; (4)建立多指标综合评价模型,选取10项反映机构科研产出数量和质量典型指标,对1997 ...
贺西安   +12 more
core  

Mechanism for measuring weight and jump value

open access: yes, 2007
本实用新型公开一种称重和打跳动值测量机构,为举升式结构,由举升机构、径向定位机构、旋转驱动机构、轴向定位机构、输送线和机架组成,其中:机架上表面设有输送线,举升机构与旋转驱动机构和径向定位机构相连,并安装在机架底部;轴向定位机构安装在机架上、位于待检产品的左右两端。采用本实用新型可实现待检产品在输送线上五个自由度的精确定位和绕水平轴转动的角度控制 ...
高英美   +5 more
core   +1 more source

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