A study on the distribution of adsorbed nanoparticles

We use Monte Carlo simulation to calculate the distributions of particles under adsorption force near planar and cylindrical surfaces,respectively.Both hard sphere interaction and repulsive Yukawa (screened coulomb) interaction are employed in our simulations.We study the influence of the inter-particle potentials.The difference between the MC simulation results and the analytical results of ideal gas model shows that the interaction between particles plays an important role in the density distribution under external fields.Moreover,the 2-dimensional constructions of particles close to the surface are studied and show relations of the interaction between particles.These results may indicate us how to improve the methods of building nanoparticle coatings and nano-scale patterns.     

日本沼虾触角腺形态学的初步研究

本文对日本沼虾触角腺的形态学进行了初步研究 .日本沼虾的触角腺由体腔囊、迷路、原肾管和膀胱组成 .体腔囊细胞有许多足状突起 ,具有过滤功能 ;迷路占整个腺体的 4 / 5,其展开长度约 ( 10 0±10 ) cm;迷路细胞顶部具有发达的微绒毛、基部质膜内陷 .原肾管细胞的微绒毛短而不规则 ,基部质膜内陷却十分发达 ,原肾管的展开长度约 ( 4 0± 4 ) cm;膀胱细胞基部质膜也有内陷但无微绒毛 .上述结构是触角腺排泄功能和渗透压调节的重要基础     

高校职称系统晋职过程数学模型

本文利用职称状态矩阵，从动态决策的角度分析了高校职称系统晋职过程，运用模糊数学的方法给出了高校职称系统晋职过程的数学模型，为使用计算机管理系统评定职称提供了可靠依据．     

Neutrino oscillations and the early universe

The observational and theoretical status of neutrino oscillations in connection with solar and atmospheric neutrino anomalies is presented briefly. The effect of neutrino oscillations on the evolution of the early Universe is discussed in detail. A short review is given of the standard Big Bang Nucleosynthesis (BBN) and the influence of resonant and non-resonant neutrino oscillations on active neutrinos and on primordial synthesis of He-4. BBN cosmological constraints on neutrino oscillation parameters are discussed.     

Controlling the bugs

In late 1984, the Reagan administration proposed a Coordinated Framework for Regulation of Biotechnology. Its proposed regulatory approach appears less constraining than the deep concerns of the 1970s concerning the risk of biotechnology would have suggested. Several distinctive characteristics of the early period of biotechnology, particularly the role of the research community in developing the initial regulatory system and the extent of federal funding, explain this development. The administration’s proposal may attract substantial support. However, implementation may lead to conflicts and problems, especially concerning human germ-line gene therapy and environmental release of viable genetically engineered organisms.     

以微量元素为指标考察活心喷雾剂两种不同制备工艺

以微量元素Ｃｕ及Ｃｕ／Ｚｎ比值为指标，考察了活心喷雾剂两种不同制备工艺。结果表明：醇提工艺中Ｃｕ及Ｃｕ／Ｚｎ比值均明显高于水煎液，与以有效成分丹参酮ⅡＡ为指标考察工艺得出相同的结论。     

冷压与热压处理对YBa2Cu3O7-δ的结构相变和超导电性的影响

 本文研究了冷压（2.2~5.2 GPa）与热压（2.2 GPa,2.50~950 ℃）对YBa₂Cu₃O_7-δ的正交→四方相转变区和超导电性的影响。冷压保持其正交结构,但破坏了超导性,在98 K（失超点）到室温呈半导体特性,再在空气中烧结,可恢复液氮温区的零电阻状态。以Cu锅密封样品,热压处理至950 ℃,不发生Cu的析出。热压处理后,98 K（失超点）到室温呈半导体特性,再经通氧烧结,于86 K出现零电阻。热压处理过程,从450~950 ℃为正交→四方转变区。950 ℃为转变结束温度,大大高于氧气、空气、氮气、真空状态的温度。400 ℃附近为起始转变温度,低于氮气、氧气气氛的温度。因此相变区加宽。T_0-t结束温度升高,与Cu锅的抑制还原作用有密切关系。如降低高压淬火速率（<<10² ℃/s）,或随后辅以氧气氛中的后处理,将有利于获得既有高密度又有高T_c的YBa₂Cu₃O_7-δ超导体。     

Emulsion polymerization of vinyl acetate using a polymerizable surfactant. III. Mathematical model

A mathematical model was developed to aid in the further understanding of the growth of latex particles in the emulsion polymerization of vinyl acctate using a polymerizable surfactant, sodium dodecyl allyl sulfosuccinate (TREM LF-40). The model incorporates the main features of the system observed experimentally: copolymerization in the aqueous phase, at the particle surface, and chain transfer to TREM LF-40. The reactions at the particle/water interface and, more specifically, the chain transfer to TREM LF-40 leading to a decrease in the average number of radicals per particle, was found to be the most significant mechanism for explaining the difference in kinetic results found for TREM LF-40 and its nonpolymerizable counterpart. The copolymerization of vinyl acetate with TREM LF-40 was also shown to slow the overall polymerization rate. However, the copolymerization alone was not sufficient to account for the decreased polymerization rates observed experimentally. A combination of copolymerization and chain transfer to TREM LF-40 was found to provide a good fit of the experimental results. © 1993 John Wiley & Sons, Inc.     

复方有机锗兽用保健促长剂的研究和开发应用

复方有机锗（Ｇｅ－１３２）兽用保健促长剂（肥猪宝）是将有机锗（Ｇｅ－１３２）创造性地应用在动物饲养上，在总结国内外先进专利技术基础上，经反复实验，开发出新一代动物保健型促长剂。具有增强免疫功能，促进细胞分裂及组织生长等作用，且不同于传统添加剂多数含抗生素，维生素及动物激素等。其特点是抗病防病能力强，生长迅速，肉料比高，且能防治生猪腹泻。本产品经四家养猪场对照实验，效果显著，日平均多增重１９３克比国     

The role of Rh on a substituted Al Anderson heteropolymolybdate: Thermal and hydrotreating catalytic behavior

The influence of Rh heteroatom on the molybdenum reducibility in the Anderson-type heteropolyoxomolybdate structure of formula (NH₄)₃[RhMo₆O₂₄H₆]·7H₂O was investigated by means of TPR technique. With comparative purposes, the thermal behavior in non-reducing conditions was also carried out by means of TGA-DTA studies. The study was performed by XRD, SEM, EDAX and FTIR-Raman techniques. Results were related to those preliminary measurements over other XMo₆ Anderson phases. Likewise, Rh(III)-Al(III) formal replacement in the RhMo₆ structural arrangement was proved. The formation of a solid solution in a limited range of composition (up to 0.25 Rh) was established in order to explore the catalytic performance of γ-Al₂O₃ supported planar heteropolyoxomolybdate, aiming at optimizing the noble metal content in the catalytic system. Preliminary measurements of RhMo₆/γ-Al₂O₃ and (Rh, Al)Mo₆/γ-Al₂O₃ activity for HDS and HYD processes were also performed. These results were compared to those obtained for CoMo₆/γ-Al₂O₃ system in similar operating conditions and other conventional catalytic systems. The potentiality and scope of RhMo₆ catalytic system for the HDS and HYD processes were analyzed.