Evaluation of Helical CT Scanning in Judging the Invasion and Metastasis of Gastric Carcinoma

To determine the accuracy of triphase enhanced helical CT in judging the invasion and metastasis of gastric carcinoma, and to discuss the relation between imaging signs and pathological findings. Methods: Triphase enhanced helical CT scanning was performed in 46 patients with gastric carcinoma. Imaging findings were compared with postoperative pathologic results. Results: (1) The accuracy of helical CT for diagnosing involvement of tunica serosa, lymph node metastasis and distant metastasis was 84.8%, 87.0% and 100~ respectively. (2) CT signs of serosal involvement, lymph node metastasis and distant metastasis were in good accordance with pathological findings (P<0.05). Conclusion: Triphase enhanced helical CT scans can comprehensively and precisely reflect the pathologic characteristics of gastric carcinoma, thus it is a reliable technique for the diagnosis of this disease.

Finite Nuclei in a Relativistic mean—Field Theory with quadratic Couplings

A quadratic scalar and vector coupling model proposed recently has been applied to finite nuclei.The calculated results are compared with those of the derivative scalar coupling (DSC) model and the nonlinear Walecka model The results show that the spin-orbit splittings are improved considerably by quadratic couplings in contrast to the DSC model However,the binding energy per nucleon,rms charge radius,as well as the spin-orbit splittings in the quadratic model are still small compared with those given by the nonlinear Walecka model and the experimental data.

Effects of Density—Dependent Bag Constant and Strange Star Rotation

With the emphasis on the effects of the density-dependent bag constant and the rotation of strange star the limiting mass of strange star is calculated. The obtained results show that the limiting mass and the corresponding radius of strange star increase as the rotation frequency increases, and tend to be lowered when the density-dependent bag constant is considered.

Application of CyboCon Advanced Adjustment and Control Software Package in Delayed Coking Unit

This article refers to application of the CyboCon software package based upon the model-free adaptive control (MFA) in the 800-kt/a delayed coking unit to realize an advanced adjustment and control strategy for the temperature control of the heater. Operation tests have revealed the convenience in operating system and simplicity in maintenance, leading to good economic benefits.

Silicomolybdennm Blne Colorimetric Determination of Available Si in Calcareons Soils

This paper deals with the determination of available Si content in calcareous soils with Mo blue colori-metric analysis method. The experimental results showed that two acid reagents of sodium acetate bufferingsolution （pH 4） and 0.025 mol/L citric acid generally had a strong ability of extracting soil available Si, andtheir soil filtrates were colorless. On the contrary , two alkaline extractants of 20 mg/mL sodium carbonateand 0.5 mol/L sodium bicarbonate only got a relevantly lower soil available Si and their extracts appeareddeep color of organic and other pigments, which could be decolorized by adding certain amounts of P-freeactivated charcoal （about 0.1 g/g soil）. In the procedure of Mo blue colorimetry,adding proper amount ofoxalic acid and K（SbO）C4H4O6 could eliminate the interference of P to Si and Si to P, respectively. Theconcentration of acids was not the major factor suppressing the interferences between P and Si in the colori-metric analysis. In the medium of 0.2-0.8 mole H￣+ /L sulfuric acid, the intensity of the silicomolybdate bltiecolor did not vary with acidity, no matter whether （NH4）2Fe（SO4）2 or ascorbic acid was used as reductivereagent. About 10 minutes was needed to form a fully blue complex at 20-25℃. After 30 minutes, the bluecolor would slowly change intn light onet and hence, the colorimetric process should be finished within a shorttime.