高功率激光的光学特性测试

由于激光核聚变研究工作的需要,促进了高功率钕玻璃激光器系统的发展。为了评价高功率钕玻璃激光器系统的光束质量,我们对某些激光的光学特性进行了测试,其中包括激光束近场的能量空间分布,激光束远场的特性和发散角,激光束波前的畸变和相干性,激光光谱等。文中的测试结果是在激光器件输出单脉冲功率水平为10~(10)W和10~(11)W的情况下进行的。     

锥连续锥拟凹向量函数最大化问题有效解集的连通性

本文讨论了锥连续函数及锥最大下果的性质，在此基础上讨论了锥连续锥拟凹向量函数最大化问题有效解集的连通性，证明了当象集为锥凸集时锥有效解集是连通的。     

双波长全息干涉计量分析

本文分析和讨论了双波长全息干涉计量的单次曝光法和双曝光法。这两种方法都提供了用可见光得到相当于不可见的长波干涉的结果,其测量灵敏度和测量精度可以通过选择合适的工作波长而能得到调整。     

一类Navier-Stokes方程组的弱解

本文讨论了一类Ｎａｖｉｅｒ Ｓｔｏｋｅｓ型方程组初边值问题的可解性及解的性质，在解的存在性，正则性，渐进性，周期性等方面得到了某些新结果，进而将这些结果作了适当的应用．     

N,N''-不对称取代脲桥联的双磷化合物的初探

本文报导了N,N'-不对称取代脲桥联的, 含有λ^4p-λ^4p^-结构单元酸双磷化合物的合成结果, 试图观察不同取代基对这类双磷化合物的影响.     

二苯卡巴肼直接光度法测定钛合金中铬

在0.1—0.2N硫酸介质中,6价铬与二苯卡巴肼形成稳定的紫红色铬合物,于最大吸收550nm波长处比色测定是一个很成熟的方法,但用于钛合金中铬的测定时,由于钒、钼、铁等共存元素的干扰,须用铜铁试剂进行沉淀分离,使操作手续繁琐,准确度较差。本法经条件试验确定,于波长580nm处测定,此时基体钛、1％钒、1％钼、0.5％铁及2％锰等共存元素均不干扰铬的测定,可不用任何分离手续直接测定钛合金中的铬。又由于减少了硝酸银用量,可免除过滤     

激光等离子体3ω0/2谐波的时间、空间分辨与密度轮廓分布

本文从实验上观察到3_^ω0/2谐波时间空间分辨结构,并以两平台密度轮廓。驻波场密度调制、等离子磁声孤立波及细丝形成与崩塌模型,对观察结果进行了分析与讨论。     

LIMITED PROTEOLYSIS OF SNAKE MUSCLE FRUCTOSE 1, 6-BISPHOSPHATASE

Limited proteolysis of snake muscle fructose 1,6-bisphosphatase (EC. 3. 1. 3. 11) with subtilisin resulted in a larger fragment of 29,000 daltons and a smaller fragment of 7000 daltons, and limited tryptic digestion for fructose 1, 6-bisphosphatase mainly produced a 32,000 daltons fragment. Both of the modified enzymes have a 4 to 5 fold increase in activity at pH 9.2 as well as a twofold increase in activity at pH 7.5. At 6μM of AMP more than 90% of the activity was inhibited for the native enzyme but not for the modified enzymes. In case of subtilisin, only 50% of activity was inhibited and in case of trypsin, non inhibition was observed. Results indicated the cleavage sites for the two proteases were apparently different.The above results and the fact, as reported previeusly, that snake muscle fructose 1, 6-bisphosphatase modified with 5, 5'-dithiobis(2-nitrobenzoic acid) also caused a twofold increase in its activity lead us to propose that the catalytic site of snake muscle fructose 1, 6-bis-phosp     

锡铜合金负极材料的电化学性能

将碱性镀液中制备的锡-铜膜在不同温度下烧结，制得几种锡铜合金负极材料。研究表明，在200 ℃烧结的锡铜合金具有单斜Cu₆Sn₅(C2/c空间群)型结构，晶胞体积大。在充放电过程中结构稳定。在0.03～2.0 V电压区间，该样品第1循环的放电容量为503 mAh·g^-1，40次循环的容量衰减率为33%。随着充放电循环的进行，放电电压平台略有升高。电荷传递阻抗是控制样品放电过程的主要因素。原子力显微图像表明，样品的表面是由高120 nm、直径20～50 nm的圆柱状颗粒组成。     

The Climatic Fluctuation and Important Events of Holocene Megathermal in China

Data from various sources including the ice core, inland lakes , paleosols in loess and eolian sands, sea level fluctuations, paleozoological, archeological evidences especially palynology and bontanical studies of China are reviewed . Holocene Megathermal mainly appeared during 8. 5-3 ka BP and lasted for 5. 5 ka. There were several strong climatic fluctuations and cooling events during this period, e. g. it was an unstable temperature fluctuation phase during 8. 5-7. 2 ka BP and was accompanied with the increase of the precipitation as well as the northward and westward migration of the vegetation zone ; the rapid development of Neolithic Culture happened in this phase. It was a stable warm and wet phase from 7. 2 to 6 ka BP, i. e. Megathermal Maximum, when monsoon was rainfall almost throughout China, plants were unprecedentedly flourished, and the Yangshao Culture reached its climax. It is characterized by strong climatic fluctuation and adverse environment during 6-5 ka BP and the impact of strong