[en] The structure of pool-type fast breeder reactor (FBR) is quite simplified in order that the calculation model may both be reflecting the structural dynamic characteristics and convenient to compute it. A simple spring-mass system could be approximatively in effect replacing a complex structure. The vessel deformation and appointed dynamic fluid pressure suppositions are taken. The motion equation of the system under horizontal seismic ground motion can be obtained by means of virtual displacement principle. Finally, the seismic response of the structure is computed

[en] Forty two patients with coronary artery disease were studied by SPECT and planar methods with dipyridamole and rest Tc 99m-MIBI myocardial perfusion imaging. For SPECT, the sensitivity for identification of patients with coronary artery disease was 91%, and for planar methods, the sensitivity was 70%. Comparing dipyridamole with rest images, three kinds of defects were presented (persistent defect, reversible defect and defect in the rest imaging reduced in the dipyridamole imaging). The correlation between SPECT and planar methods was better than between SPECT and ECG. The agreement was 86% for the former and 78% for the latter. There were no serious side effects in the dipyridamole test

[en] The authors provided a personal computer program to simulate and analysis Rutherford Backscattering spectra. The algorithms of the simulation program assume a uniform sample and use a mathematical model that the sample is considered to be made up of many sub-layers. Detector resolution can be simulated by convolving the ideal spectrum with a Gaussian. The effects of straggling are difficult to compute efficiently. The Simulation program which has been proved to be precise is refitted to be a generator of RBS (GENRBS), and creates a set of standard data to fit the experimental data. The fitting parameters are the unknown quantitative results. A damping item and a parabola interpolation algorithm are added to the fitting program to increase the reliability and accuracy. The two programs have applied to backscattering experiments and the results have conformed to the experimental values

[en] Total or near total thyroidectomy combined with the radioactive ¹³¹I (RAI) therapy is recognized as an initial treatment modality in differentiated thyroid carcinoma (DTC)patients. Whole body ¹³¹I scan (WBS) is routinely performed before RAI, which is an effective mean for depicting residual thyroid tissues and distant metastases. An accurate interpretation of positive uptakes on pre-therapy whole body I-131 scan images is important to make an appropriate treatment plan for patients. Unfortunately, there are many false positive uptake lesions, which are difficult to diagnose and easy to be misdiagnosed. In the current study, we present a rare case with radioiodine uptake in the pelvic region and is finally diagnosed as mature cystic ovarian teratoma by pathology. (authors)

[en] Highlights: • Mn²⁺can greatly promote the Cr(VI) reduction by oxalic acid at pH < 5. • The reduction of Cr(VI) had an induction period followed by an auto-acceleration period. • The in situ generated Mn³⁺ might complex with oxalate and Cr(VI) to produce a ternary complex. • The ternary complex of oxalate and Cr(VI) can automatically accelerate the Cr(VI) reduction process. • This study provides an efficient way to remediate Cr(VI)-containing acid wastewater. - Abstract: In this study, we demonstrate that Mn²⁺ can greatly promote the Cr(VI) reduction by oxalic acid at pH < 5 via an induction period and a subsequent auto-acceleration process. The Cr(VI) reduction rate constant during the late auto-acceleration process was about 10 times that of the initial induction period. Characterization results revealed that this interesting two-step Cr(VI) reduction phenomenon was attributed to the in-situ generated Mn³⁺ by the oxidation of Mn²⁺ with Cr(VI) in the presence of oxalic acid during the induction period. The in-situ generated Mn³⁺ might complex with oxalate and Cr(VI) to produce a ternary complex, thus facilitating the electron transfer from oxalate to Cr(VI) to automatically accelerate the Cr(VI) reduction process. These findings shed insight into the possible roles of widely existed Mn ions (Mn²⁺ and Mn³⁺) and oxalic acid in the transformation of Cr(VI) in natural aquatic environment, and also provided an efficient way to remediate Cr(VI)-containing acid wastewater.

[en] A radiochemical procedure is developed for the determination of ²³⁷Np in soil with multi-collector inductively-coupled plasma mass spectrometry (MC-ICP-MS) and gamma-spectrometry. ²³⁹Np (milked from ²⁴³Am) was used as an isotopic tracer for chemical yield determination. The neptunium in the soil is separated by thenoyl-trifluoracetone extraction from 1 M HNO₃ solution after reducing Np to Np(IV) with ferrous sulfamate, and then purified with Dowex 1 x 2 anion exchange resin. ²³⁹Np in the resulting solution is measured with gamma-spectrometry for chemical yield determination while the ²³⁷Np is measured with MC-ICP-MS. Measurement results for soil samples are presented together with those for two reference samples. By comparing the determined value with the reference value of the ²³⁷Np activity concentration, the feasibility of the procedure was validated. (author)

[en] The N+H₂ reaction has attracted a great deal of attention from both the experimental and the theoretical community, and most of the attention has been paid to the first excited state N(²D) atoms in collisions with hydrogen molecules and the scalar properties of the reaction. In this paper, we study the stereo dynamical properties and calculate the reaction cross sections of the N(⁴S) + H₂ (v = 0, j = 0, 2, 5, 10) → NH(X³Σ⁻) + H using the quasi-classical trajectory (QCT) method on an accurate NH2 potential energy surface (PES) reported by Poveda and Varandas [Poveda L A and Varandas A J C 2005 Phys. Chem. Chem. Phys. 7 2867], in a collision energy range of 25 kcal·mol⁻¹−140 kcal·mol⁻¹. Results indicate that the reactant rotational excitation and initial collision energy both have a considerable influence on the distributions of the k—j' correlation, the k—k'—j' correlation and k—k' correlation. The differential cross section is found to be sensitive to collision energy. (atomic and molecular physics)

[en] Objective: To discuss the clinical application of transcatheter arterial embolization in the treatment of traumatic epistaxis. Methods: Transcatheter arterial embolization was performed in 15 patients with traumatic epistaxis, caused by injury or surgery, after they failed to respond to medication and nasal packing. Seldinger technique was adopted via the femoral access and the bleeding site was determined with carotid angiography, super-selective catheterization was then carried out to embolize the ruptured artery with gelfoam particles or polyvinyl alcohol (PVA) particles. The clinical data and the therapeutic results were analyzed. Results: Of 15 patients, the epistaxis was caused by injury in 9 and by surgery of nasal or paranasal sinus in 6. Gelfoam particle was used in 14 cases and PVA particle in one case. The procedure was accomplished in one manipulation in all patients. The nasal tampon was removed in 2-3 days after the treatment with no recurrence of bleeding. No serious complications occurred. Conclusions: Transcatheter arterial embolization is a safe and effective therapy for profuse epistaxis on which the conservative management exerts no effect, and the gelfoam particle is the embolization material of first choice. (authors)

[en] A new, efficient extraction chromatography method was developed for separating "2"3"9Np from "2"4"3Am in nitric acid solution. While "2"4"3Am in 0.1 M HNO_3 was loaded on the HDEHP extraction chromatographic column, "2"3"9Np passed through the column and was collected. "2"4"3Am was eluted from the column using 1 M HNO_3 and stocked for milking again. A process based on second-milking was recommended in the present work to prepare high purity "2"3"9Np tracer. The separation procedure is rapid and effective, and the radiochemical purity of "2"3"9Np higher than 99.98 % makes it is suitable for the preparation of "2"3"9Np tracer which can be used for determination of ultra level "2"3"7Np in the environment. (author)

[en] We report the results of self-consistent Monte Carlo simulations of the density distribution along the normal to the liquid-vapor interface of a dilute binary alloy of Tl in Ga. The results of the simulation are in agreement with those obtained from experimental studies reported by Yang et al. [Phys. Rev. E 67, 212103 (2003)]. In particular, our calculations reproduce the positions and relative amplitudes of the density strata in the liquid-vapor interface and the finding that the excess Tl forms a complete monolayer that is its outermost layer. The amplitudes of the density oscillations are overestimated by the simulations, which we attribute in part to the small size of the surface of the simulation sample and in part to residual inaccuracies in the pseudopotential employed