Use of mini-computers for large scale structural analysis programs

One of the major new developments in computing technology is the mini-computer. This paper presents the results of the implementation of the ANSYS computer program (a large-scale structural analysis system) on a mini-computer.The implementation of ANSYS started with an evaluation of the existing and proposed mini-computer hardware and software systems, relative to a set of criteria derived from the structural software requirements.After benchmarking several systems to compare the claimed performances with the actual performance, the system which most nearly met the requirements for the ANSYS program was selected and ordered.The configuration chosen for this development machine is illustrated and variations from the development configuration which would be desirable for a production environment are discussed.The results of the implementation of ANSYS on the selected mini-computer system are presented. Included in the presentation are run times, run costs, accuracy of results and computer storage requirements.Finally, this paper discusses the future directions which will be pursued in this development effort. Included are discussions of the interface between the mini-computer and a larger central computer, the limits on problem size imposed by core memory and solution time and suggestions for the improvement of the performance of structural problems in a mini-computer environment.     

The optical (free-carrier) absorption of a hole-electron plasma in silicon

The near-IR absorption of a heavily injected silicon p-i-n diode has been measured. This is thought to be the first comprehensive measurement of the free-carrier absorption of a hole-electron plasma, and it behaves as expected with temperature, injection level and wavelength.

However, the absolute value of the absorption is higher than can be accounted for by ionized impurity scattering mechanisms by a factor of about 2.     

Multifocal Best's vitelliform dystrophy

Three members of a family had multifocal, macular and extramacular--Best's vitelliform dystrophy. The lesion in one patient was observed over a ten-year period. A striking symmetry of locale and evolution of these lesions is noted between the eyes of a patient as well as among the three members of the family. The pseudohypopyon of the vitelliform cyst and the vitelliform deposits showed fluorescence before fluorescein injection. A hypofluorescent halo surrounded most lesions.     

THE ORIGIN, DISTRIBUTION AND COMPOSITION OF LATERITE

The term laterite means a red rock or red earth deposit. Laterites are formed by the decomposition of different kind of rocks, under conditions yielding aluminum and iron hydroxides. The different theories of origin are discussed, as well as the chemical process of laterization, and the geographic distribution of this peculiar type of clay.     

快中子探测器的效率刻度

本文叙述了用n-p散射方法刻度快中子探测器效率的基本原理、实验方法和测量结果。400 keV氘束轰击T-Ti靶,由T(d,n)~He反应得到15.2 MeV的中子,散射体是一个圆柱塑料闪烁体(φ2.2×3cm),飞行距离2m,时间分辨率约1.5ns,效率测量的能区范围为1—14MeV,对多次散射和几何条件作了修正,总的误差约2%。     

Results of cemented metal-backed acetabular components: a 10-year-average follow-up study

We have developed a computer program for the rapid assessment of the primary structure differences between a protein of unknown sequence and a homologous known protein. Both proteins are reduced, alkylated, and digested with the same hydrolytic agent. The unfractionated peptide mixtures are submitted to automatic sequence analysis. Based on the knowledge of the reference sequence, the program utilizes the analysis data to identify all the potential peptides present in the two mixtures, determining their primary structure, homology degree, and molecular weight calculated both as integer MH+ and average mass variables. These fingerprints allow the user to easily identify the structural differences between the two proteins and clarify possible doubts by a mass spectrometric analysis of the two mixtures. In order to verify the utility of the program, we provide an application example using the already reported data of two homologous proteins.