HPLC测定包覆火药中的DNT及其迁移速率常数

用高效液相色谱法测定包覆火药中２，４－二硝基甲苯含量，样品用甲醇超声提取，在ＬｉｃｈｒｏｓｏｒｂＲＰ－１８，５μｍ柱上进行分析流动相甲醇－水（６０：４０Ｖ／Ｖ），检测波长２５４ｎｍ，方法的平均回收率９９．３％，相对标准偏差１．０％．关于迁移速率常数的估算，在恒温烘箱中，使包覆火药中２，４－二硝基甲苯加速向单基药膜扩散，间隔不同时间取出，测定其含量，进而按动力学方法得出常温（２５℃）下包覆火药中２，４－二硝基甲苯的迁移速率常数为１．４７×１０－９ｍ２／ｓ．     

评岛尾永康的《中国化学史》

文章对于日本学者撰写的第一部《中国化学史》进行了分析评论，认为该书具有的主要特点是：（１）时代性，概括了直到１９９２年以前的最新研究成果；（２）严谨性，运用文献丰富，以求得出严密结论；（３）辩驳性，注意从不同见解的争论中进行阐述，自然得出结论；（４）社会性，注意把化学发展置于整个社会中考察，揭示深层动因；（５）比较性，注意把中国化学发展置于世界范围考察，体现中国的特点和作用；（６）形象性，运用相当丰富的图片进行叙述，具体、生动；（７）日本视野性，以日本学者特有的角度阐述中国化学发展，具有独到之处。文章还指出了该书一些需要改进和提高之处。     

磺化二氯苯醚菊酯的结构鉴定

二氯苯醚菊酯磺化粗产物经衍生化反就后和到其苄基硫脲衍生物，通过对该衍生物的结构分析，最终确定了磺化物的确切结构。     

K-rich lamellar exsolution in clinopyroxene： Constraint on the depth of peridotite source at Zhimafang

The oriented lamellar K-rich exsolutions within clinopyroxene host were recognized in garnet peridotite massif at Zhimafang in the Sulu ultrahigh pressure metamorphic terrane, eastern China. EMP and TEM analyses revealed that the composition and the index of electron diffraction for this exsolution are corresponding with phlogopite, and the shape is the lamellae with 1 μm in width and 5 to 30 μm in length. Moreover, the topotaxy is that the (001) of K-rich exsolution parallels to (I00) of the clinopyroxene host. The electron diffraction analyzing shows the exsolution is of a 1M polymorphism. The high-resolution lattice fringe image displays the stack features along [001], which only a layer mineral shows. We conclude that the clinopyroxene with IM and K-rich exsolution was probably derived from mantle depths over 240 km, thus resulting from decompressional exsolution in the initial stage of slab exhumation.     

Special IR properties of palladium nanoparticles and their aggregations in CO molecular probe infrared spectroscopy

Dispersed Pd nanoparticles (Pdn) have been synthesized by reducing H2PdCI4 with ethanol, and stabilized using poly(vinylpyrrolidone) (PVP). The Pdn is applied to the glassy carbon substrate to form a thin film, and then the potential cyclic scanning at 50 mV.s^-1 from -0.25 to 1.25 V was carried out for about 30 min to form the aggregations of Pdn (Pdn^ag). FTIR spectroscopy of both transmission and reflection modes was employed to study CO adsorption on Pdn and Pdn^ag in both solidlliquid and solidlgas interfaces. It has been revealed that CO adsorption on Pdn film yields two IRbands near 1964 and 1906 cm-1, which are assigned to IR absorption of CO bonded on asymmetric and symmetric bridge sites, respectively. In contrast to the IR properties of CO adsorbed on Pdn, only species of CO bonded on asymmetric bridge sites was determined on Pdn^ag, and the direction of the IR band near 1963 cm^-1 is completely inverted. The full width at half-maximum (FWHM) of the COB^as band near 1964 cm^-1 is measured to be 14 cm^-1 on Pdn film, while it is 24 cm^-1 on Pdn^ag film. The results of the present study demonstrated that the inverting of the IR band direction is a general phenomenon that is closely related to the interaction between nanoparticles in aggregation of Pdn.     

Splenic cellular responses in vitro after tumour-immunization

Résumé L'incorporation de³Htdr, en l'absence de PHA, a obtenu un niveau élevé chez les animaux immunisés. Les cellules témoins montrèrent une radioactivité faible, à moins qu'elles n'aient été stimulées par la PHA. Les cellules spléniques des souris immunisées ne présentèrent aucune stimulation significative par l'utilisation d'une dose optimum de PHA.     

Computer simulation of flow fields for quenching medium

Using finite element method (FEM), the complex flow fields of quenching medium in a quenching tank are calculated for the cases with and without a work-piece in it. The influence of the flow homogenization device on the flow fields is studied. The computer simulation results are in consistency with the actual measurement results. According to the simulated results, the structure of the quenching tank and the flow homogenization device are optimized and more uniform flow fields are obtained.     

Thermodynamic characterization of two novel spin-crossover complexes

Spin-crossover complexes are of great interest to the scientists because of their potential application in molecular-based electronic devices. Some octahedral metal compounds with 3dn (4 ≤ n ≤ 7) configuration can induce a spin state conversion through a fine tuning condition (temperature, pressure, light irradiation, etc.). If the conversion occurs reversibly with a hystersis loop and color change, it will make the system possessing memory effect. The memory effect can be magnified and the …     

A weak El Nio event in 2002 detected by the astronomical observation

Using the length-of-day (LOD) data series derived from astronomical observations made by various modern space techniques, southern oscillation index (SOI) and anomalies of sea surface temperature (SST) in tropical Pacific Ocean, the inter-annual components of these data series are obtained by the technique of band filtering from January 1962 to October 2002. It is found that a new ENSO event has already occurred in 2002 and been detected by the interannual LOD. It is shown by the wavelet analysis that the component with a period of about 4-6 years and the quasi-biennial component are out of phase during 2001-2002, which consequently suggests that the new ENSO event cannot be a strong one.