α-Amino acids (αAA) are one of the most useful chiral building blocks for synthesis.Despite significant advances in synthetic methodology,the efficient synthesis of enantiopure αAAs carrying complex s
Copper-catalyzed highly efficient hydrosilylation reaction of enynoates was developed.Under simple reaction conditions,various di-,tri- and tetrasubstituted racemic allene products could be obtained i
The design and synthesis of π-conjugated organic molecules are one of the most important research contents of organic chemistry and are also a source of innovation for molecular materials and devices.
Bi nanosphere/GO composite was first synthesized by a simple one-step solvothermal method.Compared with bare Bi nanosphere,the nanohybrid exhibited highly enhanced and stable plasmonic photocatalytic
Transform of atmospheric dust particles is one of the key processes to modify the physical and chemical properties of dust particles during their travel in the atmosphere.To understand the transform,t
The problem of environmental pollution and energy shortage has become the two major problems faced by the sustainable development of human beings.Therefore,the development of friendly new energy has b
CO2 emissions mitigation from road construction activities is one of potential pathways to deal with climate change.Aiming to estimate the magnitude of CO2 emissions and identify the uncertainty from
采用X射线衍射仪、扫描电子显微镜、透射电子显微镜和力学拉伸实验等方法对轧态粉末冶金Ti-45Al-7Nb-0.3W合金板材的微观组织、力学性能及变形机制进行了研究.结果表明,合金板材在700℃时,屈服强度达到670MPa,抗拉强度达到874MPa,显示出良好的高温力学性能;合金韧脆转变温度(BDTT)处于800℃-850℃之间;当合金板材在BDTT以下变形时,变形组织中存在大量的位错和变形孪晶;当
类石墨烯二硫化钼因其类似于石墨烯的二维层状结构,独特的可调控带隙及其优异光电性能成为二维结构材料领域中新兴的研究热点.类石墨烯二硫化钼相比于零带隙的石墨烯而言在光电器件领域中更具发展前景.本文综述了类石墨烯二硫化钼的制备方法,并着重描述了其在摩擦、光电、催化吸附等方面的优异性能;最后对类石墨烯二硫化钼的发展前景作出了预测.
分布式能源大量、多点接入配电网,导致局部孤岛问题日益严重,给配电网运行安全和检修安全提出严峻挑战.对此本文研宄了一种主被动检测结合的配电网反孤岛装置,基于静止无功发生器(SVG)的主动反孤岛装置可向配电网发出无功电流扰动,快速改变配电网上孤岛运行频率,配合用户侧安装的被动检测隔离装置,采用基于快速离散傅里叶变换算法(FFT)的频率检测技术准确检测配电网侧频率偏移,超限后自动跳开并网开关,隔离用户和