On the dependence of the condensation coefficient on surface curvature

It is concluded that there is as yet no adequate theoretical solution for the size dependence of the condensation coefficient, the Okuyama-Zung approach to this problem being discounted.     

Thermodynamic characteristics of a biological organism: Information value of a gene and of a protein as a measure of the efficiency and as an index of selective pressure

Summary For the treatment of the information exchanged by the biological system and the external world, the concept of information amount is not sufficient because of their remoteness from equilibrium states. Further explanations are, in fact, necessary about the effects of the reception of the message,i.e. its information value that is then necessary to define for each case. We have, therefore, defined the information value of a gene and of a protein and analysed a sample of about hundred genes looking for some significative regularity in the frequency of usage of codons and amino acids allowing us to individualize the salient characteristics of a translated sequence of codons. We have found that the most used amino acids have, on the average, a low information value and, for each amino acid type, the most used codons have a lower information value. Moreover, we can say that the composition in amino acids or in codons of a sequence useful for the biological systems is such that more frequent mutations cause the smaller variation in the phenotype. All that shows that our definitions well describe the system of transmission and reception of the information value in a biological organism and that they can be considered as an index of its efficiency,i.e. of its ability to minimize the effects of the mutation of the genotype on the phenotype. To speed up publication, the authors of this paper have agreed to not receive the proofs for correction.     

Quadrupole interaction of tantalum impurities in bismuth metal

The time differential perturbed angular correlation technique has been used in the measurement of the electric quadrupole interaction of Ta impuritiy in bismuth metal. The interaction frequencies at 293, 400 and 500 K have been observed to be 288±1.5, 266.9±3 and 244.5±4.3 MHz respectively. The electric field gradient at 293 K is 4.75±0.3 × 10¹⁷ V/cm² with the temperature coefficientB=2.2±0.2 × 10⁻⁵ (K)^−3/2.     

Theoretical prediction of maxima in association constants for complex formation between flavin mononucleotide and indoleacetate in the presence of polyelectrolytes

The effects of ionene polymers (6,3-ionene, 6,6-ionene, 6,8-ionene, and 6,12-ionene) with various charge densities upon association constants K for the complexation between flavin mononucleotide and indoleacetate have been studied. Except for 6,12-ionene, K increases with increasing polymer concentration then passes through a maximum, and declines at high polymer concentrations. The value of the maximum K increases in the order 6,8-ionene > 6,3-ionene > 6,6-ionene. In contrast, 6,12-ionene gives only a monotone increasing curve with increasing polymer concentration. These curves are analyzed using the theory of the partition coefficient proposed in the previous paper. The types of the curves that the theory predicts are classified in greater detail than in the previous paper, and examples are given. © 1993 John Wiley & Sons, Inc.     

Electronic-structure calculations for complex crystals

Summary We discuss some new ideas for improving first-principle muffin-tin orbital-type electronic-structure calculations for complex crystals such as ternary and multinary compounds. The new ideas include construction of generalized muffin-tin orbitals and energy-dependent double MTO basis sets, cellular decomposition based on strongly overlapping atomic spheres and evaluation of matrix elements in the residual interstitial region by extrapolation. Supported in part by the Office of Naval Research, Contract Number N00014-79-C-0814.     

Recent advancements of moiré and microscopic moiré interferometry for thermal deformation analyses of microelectronics devices

Moiré and microscopic moiré interferometry are reviewed as they are applied to thermal deformation analyses of microelectronics devices. Applications to diverse problems are illustrated to demonstrate wide applicability of the methods. The whole-field displacement information, with various sensitivity and resolution scales, is ideally suited for the deformation study of a broad range of problems in deformation analyses of microelectronics devices.     

The method eliminating nearfield effect for measurement sound absorption coefficient

The numerical simulation is used in this work to study the nearfieldradiation pressure of a piston projector,the smooth effect on the pressure fieldby using a“big”receiver and the influence of the nearfield and in the transitionregion on measurement of sound absorption coefficient.The result indicatesthat the big error would appear when using usual absorption coefficientmeasurement method.According to the reason causing the error,the methodeliminating nearfield effect (MENE) is proposed and some digital results aregiven for a/λ=3,9 and b=0,0.5a,a(a and b are the transducer and re-ceiver radii respectively).The calculation results show that the method not onlywidens measurement range in nearfield,but also gives accurate results.     

用电子探针定量分析超轻元素中的几个问题

碳，硼，氮及氧等元素在电子探针分析中常称之为超轻元素，这些元素的定量分析还存在许多包括测量和定量修正方面的困难。本文就质量吸收系数的不准确，超轻元素谱线的化学位移，及重元素的Ｌ，Ｍ及Ｎ系谱线对其干扰等方面的问题进行研究和讨论，并分别提出了解决这些问题的方法。选择合适的标样是获得准确定量分析结果的关键。     

葡萄糖在KRPB生理缓冲溶液中电还原反应的研究

葡萄糖在ＫＲＰＢ生理缓冲溶液中电还原反应的研究朱庆存，姜力夫，郁章玉，陈常峰，周正宇（曲阜师范大学，电化学研究所，曲阜２７３１６５）关键词：葡萄糖，扩散系数，磷酸盐生理溶液。本文从葡萄糖在铂电极上的电氧化还原峰电流与ｐＨ值的线性关系，扩散系数与葡萄糖...