助剂对Pd/树脂醚化催化剂催化性能的影响 Ⅰ.铝助剂的影响

研究了不同助剂对Ｐｄ／树脂醚化催化剂在临氢条件下对催化裂化汽油Ｃ５馏份与甲醇和Ｈ２反应的催化性能的影响。结果表明，在Ｐｄ／树脂醚化催化剂中引入Ｚｒ、Ｔｉ、Ｂ、Ｓｎ和Ａｌ等助剂后，都能改善催化剂的醚化、双键异构和二烯烃选择性加氢活性，其中以Ａｌ、Ｓｎ为最好。Ａｌ助剂的体积质量和负载方式对Ｐｄ－Ａｌ／树脂醚化催化剂的活性有影响。ＢＥＴ方法和Ｘ－射线荧光光谱分析（ＸＦＳＡ）表明，Ａｌ助剂对Ｐｄ－Ａｌ／树脂醚化催化剂的表面积、孔结构和Ｐｄ离子交换量影响较小。     

Reinterpreting the basic theorem of flagellar hydrodynamics

Lorentz [1] pioneered the representation of flows at very low Reynolds number by a surface distribution of stokeslets — whose strengths, nowadays, are computed by surface-velocity collocations. That method is here compared with a representation widely used in flagellar hydrodynamics, by a curvilinear distribution of stokeslets and dipoles along the flagellar centreline; with the velocity of each cross-section expressed as a centreline value of the combined fields of singularities beyond a certain cutoff distance. The latter is also a good representation, and offers moreover some computational advantages. This paper establishes the equivalence of the two representations, and identifies those properties of Stokes flows which make both the dipoles and the cutoff essential to that equivalence.     

对提高节目技术质量的意见和建议

随着电视事业的发展，电视这一特殊传播媒介越来越为人们所重视，电视观众对电视节目质和量的要求也越来越高。在这一前提下，中央电视台在一九九五年新增设了包括电影频道、文艺频道、体育频道、少儿军事农业科技频道、戏曲音乐频道共五个卫星频道，加上原先的一、二、四套节目，每天共有八个频道，总计约140多小时的节目量进行播出。在这种情况下，虽然技术系统也相应地增加了一些设备和人员，但仍无法完全满足编播部门如此迅猛的发展。因此，确保技术质量和进一步提高工作效率就成了当前一个突出的课题。     

Al,Ga取代Bi：DyIG薄膜的磁和磁光特性的研究

本文报道用热分解法在玻璃衬底上制备了Ａｌ和Ｇａ取代的Ｂｉ：ＤＹＩＧ薄膜，对其磁和磁光特性做了详细研究．Ａｌ和Ｇａ取代的薄膜均可获得好的矩形比和高的矫顽力．对于Ｂｉ１．２Ｄｙ１．８Ｆｅ５－ｘＭＸＯ１２（Ｍ＝Ａ１，ＧＺ）薄膜，Ａ１和Ｇ２的最佳替代成份分别为１．０和Ｇ．７；最佳晶化温度分别为７００ｏ℃和６７５℃．在波长５１０ｎｍ附近，法拉第旋转角可达８°／ｕｍ左右．光学吸收和品质因子的研究结果表明，Ａｌ和Ｇａ取代能够影响光学吸收和品质因子，其中Ｇａ取代对光学吸收和品质因子的影响较大．     

Psychosocial treatment of the addictions: General issues facing psychologists.

Treatment of the addictions is changing. Psychosocial treatment programs and research projects have changed the way helping professionals view, treat, and prevent drug abuse. This article reviews the contributions included in this special series; they encompass several general issues facing psychologists who conduct treatment, research, and teaching in the field of addictive behaviors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

激光在材料中感生的瞬态光声波和光热波

研究了锁模激光在材料中产生频率达GHz的光声波和相应探测技术,用回波分析法无损坏测量了薄材料的厚度。研究了激光在材料中感生的光热波,热沉测量可用于解释材料的破坏机理。     

用过滤工艺全面提高铸锭质量

探讨了过滤器孔径对6063铝合金铸锭组织和性能的影响规律。在此基础上指出,在过滤工艺恰当时,不仅可以减少铸锭中的夹杂物,而且可以有效地防止裂纹、羽毛晶等连续铸锭中的常见缺陷。