A Method of Determining Strengthening Design Ground-Motion Parameters for the Existing Building

At present, seismic strengthening design reference period of the existing building is usually equal to 50 years in China, sometime this is uneconomic and unreasonable. In this paper, determining principle of seismic strengthening design reference period for the existing building with different importance is presented. The seismic strengthening design level of the existing building is put forward. After the shape factor of intensity probability distribution function is used to represent the seismic hazard characteristic of different areas, the seismic hazard curve formula of design acceleration Amax and earthquake influence coefficient αmax are deduced according to the seismic hazard curve of intensity. The seismic strengthening design ground motion parameter for the existing building with different importance is researched in detail by use of hazard curve formula of seismic ground motion parameter based on seismic hazard characteristic zone. At last, the method and the calculation step are explained by a calculation example. The result shows that for the existing building with different design reference period, using same design parameter is unreasonable in different seismic hazard characteristic zone, and the method is more scientific than the code method.

Fast-Growing Pseudomalignant Osseous Tumour (Myositis Ossificans) of the Finger. A Case Report.

A case of pseudomalignant osseous tumour of the soft tissues of the finger is reported. The benign diagnosis is confirmed by the histologically characteristic zone phenomenon.

A COMPARISON OF HISTONES FROM CHICKEN TISSUES BY ZONE ELECTROPHORESIS IN STARCH GEL

Histories were extracted at pH 1.7 from washed nuclei of chicken erythrocytes, spleen, liver, and testis and compared by starch-gel electrophoresis at pH 5.0, ionic strength 0.020. Spleen and liver histories displayed the most complex electrophoretic patterns with 18 zones each and differed only in relative proportions of certain zones. Erythrocyte histone contained a characteristic zone while lacking a group present in spleen and liver histones. Testis histone with only seven zones differed markedly from the other three. These results were consistent with chromatograms of erythrocyte, spleen, and liver histones on sodium IRC-50. The suggested correlation of tissue-specific histones with cell differentiation is discussed.

The Reaction of the Urine in 120 Cases of Mental Disorder

Two methods are available to determine the reaction of a fluid. The first is the method of titration for acidity or alkalinity, in which a standard solution of acid or alkali is added until a certain change in the colour of a suitable indicator is detected. The second method is to determine the hydrogen-ion concentration present in the fluid. The latter is the only satisfactory method of measuring the reaction of a fluid. The hydrogen-ion concentration expresses the reaction of neutral, acid and alkaline solutions. The electrical is the standard method, but for clinical purposes is too intricate. The colorimetric method is less complicated. It is based upon the fact that each indicator has a characteristic zone of hydrogen-ion concentrations within which its colour changes occur. For details as to the theory and technique of this method, the reader may be referred to Clarke and Lubs (J. Bacteriol., 1917, ii), and Cole (Practical Physiological Chem., pp. 19–30).