Results 31 to 40 of about 351,202 (156)
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Transition metal‐based amorphous/crystalline (a/c) heterostructured catalysts have garnered significant attention due to their exceptional activity, stability, and cost‐effectiveness. However, the precise synergistic regulation of interfacial composition and phase states remains challenging.
Haoran Li +3 more
wiley +1 more source
四川大学学报. 自然科学版, 1994 用ＭＮＤＯ方法研究了硝基烷烃分子中α－Ｈ原子的［１，３］迁移反应。用Ｐｕｌａｙ方法优化了反应物和产物的平衡几何构型，算得了反应途径，获得了过渡态，由虚振动模式对过渡态进行了确证。计算了该反应的热力学参量，进一步论证了该反应发生的可能性及和反应历程。
唐作华 +5 more
doaj
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Transition metal carbides demonstrate exceptional mechanical properties but confront a critical hardness–toughness trade‐off. Spinodal decomposition‐mediated phase separation is an effective approach to enhance mechanical properties in carbide ceramics through high‐temperature treatment.
Zhi‐Xuan Zhang +6 more
wiley +1 more source
四川大学学报. 自然科学版, 2006 对HCO(2A’)自由基与NO(2πu)在单线态势能面上的反应进行了量子化学研究.分别在B3LYP/6-311++G(3df,3pd)和MP2/6-311++G(3df,3pd)水平优化了反应势能面上各驻点的几何结构,获得相应的振动频率和零点振动能.在QCISD(T)/6?311++G(3df,3pd)水平精确计算了各驻点的能量.通过内禀反应坐标计算确认了所有过渡态,用过渡态理论计算了反应速率常数.确定了反应机理,理论预测的优势产物是与实验相吻合的HNO(1A’)和CO(1Σg+).
张金生, 陈卓, 李明
doaj
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT The design of nanoparticles confined in hollow N‐doped carbon structures is crucial for improving the oxygen reduction reaction (ORR) kinetics, yet achieving this remains a significant challenge. In this work, hollow porous nitrogen‐doped carbon encapsulated FeP/Fe2P (H‐FeP/Fe2P) were successfully constructed via a templating method combined ...
Li‐Xia Wang +8 more
wiley +1 more source
Haiyang gongcheng zhuangbei yu jishu, 2014 对采用非自控组合水翼系统的双体小水线面水翼复合船(HYSWATH)模型进行了浮态及阻力性能的试验研究,测量并分析了模型的吃水,纵倾角,阻力随航速,水翼位置和攻角变化的规律.试验结果表明HYSWATH模型在体航,过渡和翼航等不同航行状态时的纵倾角都比较小,说明非自控组合水翼系统可以保证HYSWATH模型在整个航行过程中的浮态;同时,前水翼的位置和攻角的变化对HYSWATH模型的阻力性能和船模进入翼航状态的速度影响很大,并能改善过渡状态时船舶的阻力性能.
刘亚东
doaj
Ecological Solutions and Evidence, Volume 6, Issue 2, April–June 2025.Pioneer grass species rapidly colonized the site within 1 year following land reclamation, with a grass‐to‐shrub transition concurrently with dike construction, indicating a clear trajectory of species establishment and development in a newly formed saltmarsh.
Deyi Yin +4 more
wiley +1 more source
含酯氧基手性方酰胺基醇催化前手性酮不对称还原反应机理的计算研究
四川大学学报. 自然科学版, 2003 用量子化学半经验方法AM1对含酯氧基手性方酰胺基醇催化苯乙酮不对称还原的反应机理进行了计算研究,提出了合理的反应机理.结果表明,还原产物的手性是由口恶唑硼烷/硼烷/苯乙酮加合物及相继的六元环过渡态所决定的.根据过渡态理论,计算得到反映立体选择性大小的理论e.e.值.
任译, 杨静, 刘玉明, 谢如刚
doaj
Integrative Conservation, Volume 3, Issue 4, Page 312-329, December 2024.Biosphere reserves aim to protect global biodiversity alongside social and economic development. In the Cape Floristic Region, biosphere reserves are an effective conservation approach to protect arthropods against habitat transformation in this biodiverse region.
Michael J. Samways +3 more
wiley +1 more source
Poverty &Public Policy, Volume 16, Issue 4, Page 309-322, December 2024.ABSTRACT In Canada, eligibility for provincial income assistance requires applicants and recipients to pass a means test—they must have income and assets below a specified level. The “good policy” argument argues that strict means tests ensure those with sufficient income or assets cannot access nor continue on income assistance, keeping caseloads low.
Gillian Petit, Lindsay Tedds
wiley +1 more source