[en] By studying and applying a calibration model for soil radon concentration,a calibration method was established based on the residual gas in the soil. The application practice proved the validity of the method. (authors)

[en] In order to study the characteristics of the flow with periodically changing flow rate, method of characteristic (MOC) is used to establish the mathematical model. A numerical simulation code is programmed based on the mathematical model. The case that single-phase water flows adiabatically in a round channel with flow rate fluctuating is numerically simulated. The simulation results are compared with theoretical values and experimental results. It is shown that when the flow rate fluctuates in sine law with time, the pressure drop fluctuates with the same period, but there is a phase lag between the two. The numerical results of pressure drop curve in laminar condition accords well with theoretical analysis result; but the phase lag and pressure drop values in laminar flow differ from experimental values. Preliminary analysis is given to the difference

[en] Manipulator is a key part of mobile spent high active radioactive source (SHARS) conditioning equipment. Its stability will affect the successful operation of the conditioning equipment. Based on the failure analysis of ZC205B master slave hinged manipulator in cold test, this paper is intended to provide the identification and correction of the problems existing in the process of its operation, for the purpose of providing guidance on the future thermal test. (authors)

[en] A nicer lighting is a key of spent high activity radioactive sources (SHARS) conditioning. According to the lighting standard of CIE and the special needs of hot cell, in this paper, hot cell of SHARS conditioning facility is analysed, including optical design, luminaire layout and so on. So floodlight are adopted and lighting effect are validated. (authors)

[en] • One of principles of RW management is minimization and reduction: - Advance process and facilities should be reasonably applied to reduce the waste generation (''Law of the People's Republic of China on Prevention and Control of Radioactive Pollution'', 2003); - Operator of RW storage facilities should dispose or clear up solid waste timely (''Regulations on the safety of RW management'', 2011); • Reduction principle: - Control of generation; - Use of volume reduction technique; - Clearance of slightly contaminated material

[en] An effective spin-orbit coupling can be generated in a cold atom system by engineering atom-light interactions. In this Letter we study spin-1/2 and spin-1 Bose-Einstein condensates with Rashba spin-orbit coupling, and find that the condensate wave function will develop nontrivial structures. From numerical simulation we have identified two different phases. In one phase the ground state is a single plane wave, and often we find the system splits into domains and an array of vortices plays the role of a domain wall. In this phase, time-reversal symmetry is broken. In the other phase the condensate wave function is a standing wave, and it forms a spin stripe. The transition between them is driven by interactions between bosons. We also provide an analytical understanding of these results and determine the transition point between the two phases.

[en] Compared with borate concentrate cement solidification, microwave in-drum drying technology not only decreases greatly in volume, but also constrains radioactivity in a finite field. The study was designed therefore, including pre-test and pilot test. It comes out that it is feasible to dry the simulated borate concentrate by microwave in drum. During the microwave drying process, the outlet temperature can be an intuitionistic sign of subsequence feeding. In batched drying process, the first feed must be moderate to avoid microwave reflection; the less each subsequent feed is, the better the product's characters would be. Under the test condition, it is recommended that feed SBC or end drying when outlet temperature is in excess of 72 ℃; the first feed is recommended to be 2 kg SBC, and subsequent feeds can be l kg SBC each. (authors)

[en] Mixed substrate systems are often encountered in pharmaceutical, food, wastewater processes and chemical manufacturing industries. In wastewater treatment systems, a number of organic compounds are present at the same time. In these cases it is inevitable that the toxic, or inhibitory substrates will be found in mixtures with nontoxic, or conventional wastes. In the presence of alternative carbon sources, a number of possible substrate interactions can occur. Extensive studies on biodegradation of single components have been conducted. However, there is insufficient information on the performance of biological treatment facilities for the removal of a specific chemical from wastewater, consisting of a mixture of organic pollutants. There is a strong need for extensive studies of multisubstrate systems. A broad data base will help to understand the interaction and removal rates of organic compounds in mixtures. These studies will also help to establish control mechanisms that regulate the relative utilization rates of mixtures. In this paper emphasis will be given on a comprehensive review of mechanisms, experimental methods, and modeling studies for biodegradation of mixed substrates. 8 refs., 5 figs., 1 tab

[en] Experimental study was carried out on conditioning equipment developed for spent high activity radioactive source (SHARS) in order to meet the requirements of the safety of long term storage of SHARS. The experiment result shows the equipment meet the demands of the SHARS in excess of 3.7 x 10¹³ Bq(1000 Ci), and dose rate at the operation position is between 8.5 μSv/h and 16.5 μSv/h. (authors)

[en] Objective: To study the effect of hedyotic diffusa on spleen lymphocytes in tumor-bearing mices treated with radio- therapy. Methods: Electron microscope was used to observed ultrastructure of spleen. The proliferation and S phase of spleen lymphocytes were determined with flow cytometry and the natural killing activity were determined by means of ³H-TdR release assay. Results: Hedyotic diffusa could ameliorate spleenic ultrastructural injury, in tumor-bearing mices treated with radiotherapy, accelerate proliferation of spleen lymphocytes, and enhance their capacity to kill U14 cells. Conclusion: Hedyotic diffusa provided protection against radioactive injury for spleenic immunocytes in experimental mice. (authors)