[en] The inverted-annular flow film boiling heat transfer experimental data of water have successfully been obtained in an φ 15 x 1.5 tube at low pressure by hot patch technology. Effects of experimental parameters on the heat transfer coefficient are analysed and the data is also compared with some existed film boiling correlations, but none of these correlations are found satisfactory. Finally, a physical model of film boiling heat transfer for the inverted-annular flow is presented

[en] RELAP5/MOD3 code is used to analyze 4 x 4 fuel-assemble test's small break loss of coolant accident. The results show emergency core cooling system for the tests can ensure the test core safety, not influence High Flux Engineering Reactor

[en] Compared with Pressurized Water Reactors, Pulse Reactors show two characters: One is fuel elements with U-Z_rH_X, the other is operation under the condition of low temperature, low pressure and natural circulation. These make it necessary that special analysis tools be used for Pulse Reactors. The author will introduce the steady-state thermal-hydraulic analysis methodology of Pulse Reactors first, then calculate steady-state thermal-hydraulic behavior of a 1 MW Pulse Reactor. At last, comparing the calculated results with foreign results and experimental data, show that this methodology is feasible

[en] The several thermal hydraulic design codes used for the pulse reactor developed by Nuclear Power Institute of China (NPIC) independently are presented. They are the natural circulation flow analysis code (MC-FLOW), the core thermal hydraulic analysis code (MC-THAS) and the pulsed reactor transient analysis code (MC-TRAN). These codes can meet the requirements and are verified on the basis of the prototype pulsed reactor. The verification shows these codes can be used for the engineering design of Xi'an pulsed reactor with full confidence

[en] A set of new constitutive relations appropriate to Inverted Annular Film Boiling regime has been developed based on Aritomi's experiment using Freon-113. Conservation equations for two-fluid model together with proposed constitutive relations were solved numerically by the two-phase flow analyzer MINCS which had been developed at Japan Atomic Energy Research Institute. Calculated results for the Aritomi's test were in good agreement with the experimental results. The proposed model were applied to the analysis of Stewart's experiment using water for verification. A better agreement between calculated and experimental results was also obtained at relatively low pressure condition. The effects of liquid inlet subcooling, pressure and flow rate on wall heat transfer coefficient were discussed. (author)

[en] A code RCS-I (Reactor Core Simulator) for reactor core 3D physics-thermal hydraulics couple calculation is introduced. The neutronics model in the code is an advanced coarse nodal Green's function method, and the thermal hydraulics model is a subchannel analysis method. By using several feedbacks, the code can more really describe the burnup feature of a core. It has criticality, burnup, poisoning, load trace and refueling calculating functions, and can be used in the power reactor and research reactor design

[en] Laser cladded NiCrBSi alloy coating was fabricated on the surface of a 42CrMo roll using a 6 kW fiber laser. The effects of the laser power, scanning speed and feeding rate on the cladding layer form, size, dilution rate, microstructure, and hardness of coating were studied by using optical microscopy (OM), scanning electron microscopy (SEM) and a microhardness tester. The results show that the microstructure, size, dilution rate and hardness of the cladding layer had changed with an increase in laser power, powder feeding rate and scanning speed. The appropriate parameters of the laser cladding experiment are as follows: the laser power is 2000 W, powder feed rate 20 g × min${}^{-<!--\; ???\; -->1}$, the scanning speed 4 mm × s${}^{-<!--\; ???\; -->1}$. The cladding layer and the substrate exhibit good metallurgical bonding under the above processing parameters. The microstructure of the cladding layer is fine, the dilution rate is 9.8 wt.-%, and the microhardness of the cladding layer is 710.7 HV.

[en] Thyroid cancer account approximately 1.3%-1.5% of cancers all over the body, the attack rate is raising up recently. Most operation is subtotal thyroidectomy at the first time, because thyroid cancer was regarded as thyroid nodule usually account 90.5%. Operation one more time with leftover cancer rate about 41.3%, and with lymphonodi cervicales deadexis about 72.8%. Most patient reluctancy operation again in view of complication with hypoparathyroidism and injure of recurrent nerve. The efficacy of radioiodine ablation can eliminate the minimum cancer which concealed in remained thyroid glandular tissue, and cut down the recurrence rate of thyroid cancer, and destroy metastasis, in favour of long-term follow-up. A great quantity of literature report about 60% with 1.11GBq ¹³¹I and 90% with retreatment with 1.11 GBq ¹³¹I in patients with differentiated thyroid cancer undergoing subtotal thyroidectomy, ¹³¹I treatment can shorten length of stay, and decrease radiation effect, and cut down side effect and economy burden, as far as possible to achieve therapeutic efficacy. (authors)

[en] Objective: To explore various conditions of teen-age hyperthyroidism with ¹³¹I therapy. Methods: 46 patients were administrated with ¹³¹I, the changes of T₃ and T₄ level of serum were tested by radioimmunoassay. The improvement of clinical symptoms has been observed in 46 cases with teen-age hyperthyroidism by ¹³¹I before and after treatment. Results: 39 of 46 (84%) has been proved complete responses (CR), partial responses (PR) 7 cases. 3 months later; we found that 39 patients have hypothyroidism symptoms, T₃ and T₄ level of serum decreased. There are significance increases of TSH 23 percent patients. Conclusion: It has been proved that treatment of teen-age hyperthyroidism by ¹³¹I is effective and safe

[en] Objective: To investigate the difference in the pass rate of intensity-modulated radiation therapy (IMRT) planning in patients with different tumors and its value in determining pass rate thresholds. Methods: A total of 35 verified IMRT plans for each of esophageal cancer, nasopharyngeal carcinoma, breast cancer, cervical cancer, and lung cancer were selected consecutively, and a one-way analysis of variance was used to investigate the difference in pass rate. A single pass rate threshold was used to test all IMRT plans, and the pass rate thresholds of IMRT plans for different tumors were calculated based on normal distribution law. Results: There was a significant difference in the means between the 5 groups of data (F = 35.83, P < 0.01), and there was also a significant difference between any two groups (P = 0.000). There were statistically significant differences between nasopharyngeal carcinoma group and other four groups (P = 0.000). The difference was not only significant between the breast cancer group and the esophageal cancer group (P = 0.001), but also between the breast cancer group and the lung cancer group (P = 0.033). The calculated results of each threshold were 93.37%, 89.34%, 97.68%, 95.99%, and 95.42%, respectively. Conclusions: Different thresholds should be used for IMRT plans for different tumors, and the normal distribution law can be used to calculate the threshold. (authors)