[en] Objective: To explore the changes of plasma ET-1 and serum NSE, NPY levels both before and after treatment in patients with acute cerebral infarction and their significance. Methods: Plasma ET-1 and serum NSE, NPY levels were measured with RIA in 32 patients with acute cerebral infarction both before and after treatment as well as in 35 controls. Results: Before treatment plasma ET-1 and serum NSE, NPY levels were significantly higher than those in controls (P<0.01). After for 3 months of treatment,the levels dropped markedly, but still remained significant higher (P<0.05). Conclusion: Changes of plasma ET-1 and serum NSE, NPY contents both before and after treatment might be of prognostic importance in patients with acute cerebral infarction. (authors)

[en] The high-purity nitric acid and hydrochloric acid were prepared by high-speed countercurrent chromatography (HSCCC), using the 0.25 mol/L tri-octyl-phosphorous oxide in heptane as the stationary phase, and the normal nitric acid and hydrochloric acid were used as mobile phase. The results show that the uranium contained in the acid purified is reduced to lower than 1 pg/mL, which is close to the content of uranium in the high-purity water and the high-purity acid prepared by isothermal evaporation and sub-boil distillation. (authors)

[en] Extraction of Am(III) and Ln(III) from NaClO₄ medium has been investigated with di(2-ethylhexyl) dithiophosphoric acid, di(2-ethylhexyl) monothiophosphoric acid, di(2-ethylhexyl) monothiophosphinic acid, octylphenyl dithiophosphinic acid and 11 kinds of dialkyl dithiophosphinic acids (alkyl = hexyl, heptyl, octyl, nonyl, 2-ethylhexyl, 1-methylheptyl, phenyl, chlorophenyl, methylphenyl, 2,5-dimethylphenyl, and 3,5-dichloro-4-methylphenyl) in xylene. The effect of chemical structures of those extractants on separation capability has been studied. The relationship between the slope value of the lg D - pH and extraction conditions can be described as: lg S = a lg(C_HA/C_M^S/4) + b. In the presence of macro amounts of Eu(ClO₄)₃, the formula, lg SF_Am/Eu = B - 2 lg(C_HL - D_Eu/(D_Eu + 1)C_Eu), can well describe the relationship between separation factor and the extraction condition. A high separation factor (SF_Am/Eu = 2500) is obtained by solvent extraction from 1 mol/L NaNO₃ solution with 0.5 mol/L di(2-ethylhexyl) dithiophosphinic acid in toluene. (orig.)

[en] We have discussed constitution and the application in atom-molecule physics of nuclear data acquisition and processing system based on networking

[en] Applying the network technology to combine together many independent subsystems of nuclear data acquisition and processing system based on the PC computers and with different functions, a new type of nuclear data acquisition and processing system with multi function and networking topology has been developed. The optimum mode of combination, the principle of operation and the method of realization for this system were discussed and the first results of the application of this system in the study of cluster features on a 2.5 MeV Van de Graff accelerator were presented. (authors)

[en] A intelligent and real time measurement and control microcomputer system for measuring magnetic fields with NMR method was discussed and the principle and technology for building this system were given in this paper. (authors)

[en] The authors an effective Lorentz-violating electrodynamics model via static de Sitter metric which is deviated from Minkowski metric by a minuscule amount depending on the cosmological constant. The authors obtain electromagnetic field equations via the vierbein decomposition of tensors. In addition, as an application of the electromagnetic field equations obtained, the authors get the solutions of electrostatic field and magnetostatic field due to a point charge and a circular current loop respectively. The authors also make some discussion on the implication of the Lorentz violation effect in our electromagnetic theory. (authors)

[en] Highlights: • VLE data for (R13I1 + R290) system were measured at four temperatures. • Experiments were based on the vapor-recirculation method. • VLE data were correlated using PR–vdW and PR–HV–NRTL models. • Zeotropic behavior can be found. - Abstract: In this paper, the (vapor + liquid) equilibrium data for (R13I1 + R290) were measured by a vapor-recirculation apparatus at temperatures from (258.150 to 283.150) K. The VLE data were correlated by the Peng–Robinson equation of state with two different models, the van der Waals mixing rule, and the Huron–Vidal mixing rule involving the NRTL activity coefficient model. Good agreements were found between the calculated data and the experimental data. The maximum average absolute relative deviation of pressure (AARD p) was 0.48%, while the maximum average absolute deviation of composition (AAD y) was 0.0040. Meanwhile, zeotropic behavior can be found for the measured system in this study. The total combined standard uncertainties for temperature, pressure and composition measurements were ±5 mK, ±0.0005 MPa and ±0.005, respectively

[en] The present work is much motivated by finding an explicit way in the construction of the Jack symmetric function, which is the spectrum generating function for the Calogero-Sutherland (CS) model. To accomplish this work, the hidden Virasoro structure in the CS model is much explored. In particular, we found that the Virasoro singular vectors form a skew hierarchy in the CS model. Literally, skew is analogous to coset, but here specifically refer to the operation on the Young tableaux. In fact, based on the construction of the Virasoro singular vectors, this hierarchical structure can be used to give a complete construction of the CS states, i.e. the Jack symmetric functions, recursively. The construction is given both in operator formalism as well as in integral representation. This new integral representation for the Jack symmetric functions may shed some insights on the spectrum constructions for the other integrable systems. (general)

[en] Objective: This study retrospectively analyzed the efficacy and toxicity profile of hyperfractionated intensity-modulated radiotherapy (HF-IMRT) for locally recurrent nasopharyngeal carcinoma (NPC). Methods: Twenty-eight locally recurrent patients of NPC were enrolled,23 male and 5 female with a median of 51 years (range 25-74 years). All patients had a median recurrent time of 17.5 months and received HF-IMRT with a total dosage of 60-70 Gy, each consisting of 1.2 Gy per fraction, each of the 2 fractions were spaced 6 hours apart and lasting for 5 days. Twenty-five patients received concurrent chemotherapy of nedaplatin or two agent regimen, 4 patients received Ad-p53 gene therapy and 6 patients received target therapy of EGFR monoclon antibody. Results: The complete response and partial response rates were 89% (25/28) and 11% (3/28) after being treated by HF-IMRT for 3 months. The median followup time was 27.5 months. The 1, 2, 3-year overall survival rates, locoregional recurrence-free survival rates and progression-free survival rates were 100%, 91%, 80%; 100%, 80%, 55%; 88%, 65%, 55%, respectively. Three patient were observed to develop severe nasopharyngeal necrosis but recover after treatment, no patients experienced hemorrhage of nasopharynx. Multivariate analysis indicated that the poor prognostic factors included tumor stages (T₃-T₄) (P = 0.00) and no chemotherapy (P = 0.04). Conclusion: HF-IMRT is feasible for locally recurrent nasopharyngeal carcinoma with satisfactory local control and controllable adverse reaction,it is worth further clinical studies. (authors)