Results 11 to 20 of about 141,082 (164)
Gaoya dianqi, 2021 采用脉冲电子注入式迁移管,对GIS中常见气体成分在低E/N值下的负离子迁移特性进行了研究,研究对象包括:O2、SO2、SOF2、SO2F2和SF6。在所研究E/N值范围内（0.264～1.168 Td）,结果表明:由于避免了传统离子门迁移管技术的电荷损失问题,离子电流信号强度大为提高;所研究气体对应的负离子迁移时间与迁移场强呈线性关系,迁移距离越长,迁移时间变化率越大。采用迁移距离和迁移时间差值法计算出的离子迁移速度,能有效消除离子起始加速阶段速度不稳定对稳定迁移速度的影响 ...
辛忠良 +4 more
doaj
Zhejiang Daxue xuebao. Lixue ban, 2018 采用密度泛函理论的B3LYP方法、微扰理论的MP2方法和自洽反应场(SCRF)理论的smd模型方法，研究了组氨酸分子3种最稳定构型的手性转变机理及水溶剂化效应.发现标题反应有a、b、c 3条通道，对于构型1和2,a是手性碳上的质子先以氨基为桥迁移，b是羟基异构后手性碳上的质子再以氨基为桥迁移，c是以羧基和氨基联合作桥实现质子迁移.对于构型3，a是质子只以氨基为桥迁移，b是质子顺次以羰基与氨基为桥迁移，c是质子顺次以羧基和氨基为桥迁移.计算表明：构型1和2的主反应通道都是b，决速步自由能垒分别为250 ...
WANGZuocheng(王佐成) +4 more
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, 2000 该文在介绍类比迁移的概念、阶段、影响类比迁移的因素, 以及研究类比迁移的意义的基础上, 主要介绍了类比迁移的三个重要理论: 结构映射理论、实用图式和示例理论 ...
曲衍立, 张梅玲
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Many existing rubrics for L2 argumentative writing prioritize form‐based linguistic accuracy and complexity while insufficiently addressing substantive argumentative rigor and effectiveness. This limitation is further complicated by cross‐cultural variation in rhetorical conventions and educational practices, which challenge the direct ...
Zihan Xu, Peiyun Liu
wiley +1 more source
AI foundation models in plant biology
New Phytologist, EarlyView.Foundation models decode genomes, engineer proteins, phenotype crops, and drive AI agents across plant biology. This figure was created in BioRender (BioRender.com/xcmmkel). Summary Rapid technological progress has enabled plant biologists to accumulate unprecedented volumes of multi‐scale, multi‐modal data, yet this abundance of data has intensified ...
Haopeng Yu
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Visible‐Light‐Excited Optical Thermometry in Ca3Sc2Si3O12: Er3+ via an Efficient Eu2+ Bridge
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Er3+ ions are promising for optical thermometry due to their thermally coupled levels. However, their parity‐forbidden transitions result in weak and narrowband absorption, which restricts excitation to infrared lasers (e.g., 808, 980, or 1550 nm). Moreover, the single emission center inherently limits temperature sensitivity. In this work, we
Yi Liu +6 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Deep skin infections and dense biofilm barriers caused by Propionibacterium acnes (P. acnes) remain significant challenges in recurrent acne vulgaris, exacerbated by the poor stratum corneum penetration of conventional therapies and rising antibiotic resistance.
Bingran Qi +3 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Through grain boundary segregation engineering, a crack‐free high‐strength CoCrNi medium‐entropy alloy (MEA) can be successfully fabricated via laser powder bed fusion (PBF‐LB). The influence of micron‐sized TiC particles on microstructural evolution, grain boundary segregation behavior, and mechanical properties was systematically ...
Cunliang Pan +9 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Nickel oxide (NiO)‐based electrodes with high theoretical specific capacitance can effectively increase the energy density of supercapacitors—the key factor limiting their practical deployment. However, several issues still restrict the production of advanced NiO‐based electrodes.
Ya‐Min Feng +10 more
wiley +1 more source