Diastereoselective cycloadditions of chiral homoallylic alcohols with benzonitrile oxide

The first diastereoselective cycloaddition of a nitrile oxide with a homoallylic alcohol is discussed. The reaction of benzonitrile oxide with the magnesium alkoxides of chiral homoallylic alcohols has been shown to proceed with good diastereoselectivity, favoring the syn isomer of the resulting 2-isoxazoline.     

Polyolefin-supported recoverable/reusable Cr(III)-salen catalysts

The design of functional soluble polyolefins for use as supports for salen ligands and metal complexes is described. Examples and applications that use both polyisobutylene (PIB)- and polyethylene (PE(Olig))-bound recoverable/recyclable salen ligands/metal complexes are detailed. In the case of using PIB as a support, the polymer-bound complexes can be recovered through the use of latent biphasic or a thermomorphic mixed solvent systems. In the case of PE(Olig)-supported complexes, the thermomorphic PE(Olig)-bound salen species can be dissolved in "hot" solvents and quantitatively recovered as solids upon cooling to room temperature. Both the PIB- and PE(Olig)-bound salen catalysts were shown to catalyze the ring-opening of epoxides with various nucleophiles. Both sorts of polyolefin-bound catalysts can be recycled and reused with no observed loss in activity. However, limitations of catalyst concentration make chiral versions of these complexes uncompetitive in comparison to conventional chiral salen catalysts that can be used in neat substrate at higher concentration to produce high enantioselectivity in the ring-opening products. The preparation of a PIB-bound "half-salen" catalyst was also briefly examined.     

一种新型固体Q开关Cr4＋∶YAG的实验研究

对一种适用于Ｎｄ３＋∶ＹＡＧ激光系统的新型被动Ｑ开关掺铬钇铝石镏石（Ｃｒ４＋∶ＹＡＧ）进行了实验研究，得到单脉冲能量为１４５ｍＪ、脉宽为３０～４０ｎｓ、效率接近１％、动静比达４０％以上的结果。     

预脉冲灯泵钛宝石可调谐激光器

利用预脉冲技术,可减小氙灯放电初始阻抗,使主放电电流脉冲前沿变陡,脉冲包络变窄,峰值变高,泵浦能量集中,有利于灯泵钛宝石激光输出。试验证明,在低能量（４７Ｊ）注入时,电光转换效率提高１８％,输出９５０ｍＪ;在高能量（１１６Ｊ）注入时,效率提高５％,输出能量１８１０ｍＪ。该激光器可调谐范围为６９５～９４０ｎｍ。     

RESEARCH PROGRESS OF LOCKED-IN STRESS IN ROCKS1)

封闭应力对岩石力学特性的影响不容忽视。从陈宗基提出岩石的封闭应力定义以来,研究的学者较少。本文从前人对封闭应力的定义出发,结合岩石力学发展现状,对封闭应力概念进行了拓展,提出了新的定义。将岩石力学研究中符合封闭应力定义的应力形式进行了归纳和分类,总结了各类封闭应力的变化规律及其计算公式,讨论了封闭应力与地下工程开挖之间存在的关联性及其影响的表达形式。本文对于推动封闭应力的深入研究具有积极意义,将为解释深部岩石力学特殊现象提供新的途径。     

基于GRIN透镜微小角位移的测量技术研究

根据1/2波节自聚焦（GRIN）透镜中光的传输特性,提出了一种新颖的测量微小角位移的模型,通过对模型中光线传输和几何关系的理论分析,推导了待测角位移与光耦合效率之间的传递函数.针对模型对测量范围的限制,提出了一种可行的拓宽测量范围的方法.研究结果表明,该模型不但测量范围宽,而且测量准确度高,线性度好.     

A g-C3N4-coated paper-based separator for sodium metal batteries

Journal of Solid State Electrochemistry - A paper-based membrane coated by graphitic carbon nitride (g-C3N4) is prepared via a dip-coating method and used as a separator for sodium metal batteries...     

最优数棱镜组及棱镜耦合扩束支腔计算

本文给出扩束棱镜组的最优数计算和取定公式,可使其单程透过率取得接近最大值的较大值。给出使棱镜耦合扩束支腔的单程损耗基本一致的简便计算方法,可省去繁琐的数值求解运算。     

大学物理实验“课程思政”的探索与实践——以“金属杨氏模量的测定”为例

在立德树人视域下,江南大学理学院物理实验中心开展了大学物理实验"课程思政"的探索与实践,逐步建立了在实验中思政、在思政中创新、在创新中树人的教学改革模式,取得了丰硕的实践成果.以"金属杨氏模量的测定"为例,呈现了实践课程渗透课程思政,并将之落到实处的具体实施方案.