射流式单重态氧发生器的工作稳定性实验

 实验研究了BHP的化学稳定性以及射流式SOG稳定工作的判据,为射流式SOG的研究提供了实验依据。通过理论研究和实验数据的综合分析,给出了单排孔进气结构射流式单重态氧发生器稳定工作的判据vg/vj≤2。提高射流式SOG的BHP驱动压力,以提高射流的速度是提高Cl₂摩尔流量也即单重态氧发生量的有效手段。     

氨基酰化酶与Cu(Ⅱ)相互作用的谱学研究

通过顺磁共振法、可见光谱法及酶活性测量研究从猪肾中提纯的氨基酰化酶（Aminoacylase,简称ACY）在pH4.0条件下与外加的Cu(Ⅱ）离子存在直接相互作用。结果发现：外加Cu(Ⅱ）离子进入ACY活性中心位点,取代了活性中心位点的Zn(Ⅱ）,使酶活性下降。随着pH变化生成的两种构型酶衍生物在溶液中可相互转化。     

沉痛悼念著名力学家、中国力学学会第二任理事长钱令希院士

著名力学家、中国力学学会第二任理事长、中国科学院院士钱令希教授,因病医治无效,于2009年4月20日10时零1分在大连逝世,享年93岁.     

Novel method for synthesis of titanium silicalite-1 (TS-1)

Titanium silicalite-1 (TS-1) was easily synthesized using inorganic silicon and titanium source, tetrapropylammonium bromide (TPABr) or TPAOH as templating molecule, NH3· H2O, HDA or TEAOH etc. as base sources. In this system, TPA cations (come from TPABr or TPAOH) served as tern-plating agents to direct the MFI structure. NH3H2O, TEAOH or HDA etc. provides the alkalinity necessary for crystallization. X-ray diffraction, UV-Vis, ER spectroscopies, SEM, 29 Si MAS NMR showed that the zeolites obtained possessed all the structural characteristics of TS-1, and titanium atoms were introduced into the framework in TS-1. This material was proved to have high crystallinity and high catalytic activity to allyl chloride epoxidation and propylene epoxidation. All the samples synthesized had similar catalytic properties with a standard TS-1 through compared inorganic reactant system with organic synthesis system using propylene epoxidation. The effects of silicon source and TPABr/SiO2 ratio were discussed.     

空间接触问题的参变量方法

本文借助于参变量方法给出了空间接触问题的解法.空间接触单元刚度矩阵是通过接触压力和摩擦力的惩罚函数表示式而引入的.两种空间接触本构关系(圆锥型和棱锥型)可以类似于弹塑性问题的模型得到,一定的数学技巧可使惩罚因子最后得以消去,而获得参变量线性互补问题.两个实例证明了这个方法的有效性.     

Development and validation of a three-dimensional,wave-current coupled model on unstructured meshes

Using unstructured meshes provides great flexibility for modeling the flow in complex geomorphology of tidal creeks,barriers and islands,with refined grid resolution in regions of interest and not elsewhere.In this paper,an unstructured three-dimensional fully coupled wave-current model is developed.Firstly,a parallel,unstructured wave module is developed.Variations in wave properties are governed by a wave energy equation that includes wave-current interactions and dissipation representative of wave breaki...     

Acid-base cooperativity of heterogeneous catalyst containing acidic framework and sterically hindered base for aldol condensation

A bifunctional heterogeneous catalyst containing two mutually incompatible acidic and basic sites,which exhibits cooperative catalytic behavior in the aldol condensation of acetone and various aldehydes,was synthesized by postgrafting of 1,5,7- triazabicyclo[4.4.0]dec-5-ene(TBD,a sterically hindered organic base) onto Al-MCM-41 molecular sieve.     

氧碘化学激光器增益谱线的实验研究

 利用可调谐二极管激光器为探测光源, 直接测量了氧碘化学激光器的增益谱线的精细结构及其各谱线所占比例。同时用碘原子吸收池标定了六条谱线。     

氧碘化学激光器UR-90腔光束质量研究

 概括了光束质量的表示方法, 由衍射极限倍数的定义出发, 提出重点在于选取光斑直径, 而且可把光斑测量归结到电子测试仪对剪切电平的测量上。给出了电子测试仪的测试原理, 由所测光斑直径计算了氧碘化学激光器U R290腔的光束质量指标—衍射极限倍数, 达到了1.2～1.6倍衍射极限, 最后进行了误差讨论。     

丝蛋白分子的红外光谱研究

本文记录并研究了桑蚕丝、柞蚕丝、天蚕丝和天柞杂交蚕丝等几类共42种蚕丝样品的红外光谱,确定了柞丝类和桑丝类两大类蚕丝样品在红外光谱方面的差别。从而为鉴别蚕丝样品的种类建立起一种简便易行的方法。通过对各类样品的红外光谱数据处理,计算了某些谱带的相对强度比,获得了一些半定量的规律性结果。