[en] Nuclear Medicine in China was established in 1956, when the first course, Biomedical Applications of Isotopes, was offered in our country by the Peking Union Medical College (PUMC). In 1958, several courses in Clinical Nuclear Medicine brought up the first generation of Nuclear Medicine physicians in China. ^99mTc and ^113mIn generators were supplied in 1972. The first gamma camera was imported in 1972 and the first homemade gamma camera was installed in 1977. The Chinese Journal of Nuclear Medicine commenced publication in 1981. The first single photon emission computed tomography (SPECT) camera was imported in 1983. At present, there are 800 Nuclear Medicine departments in China with a total of 6,000 staff. Beijing and Shanghai each have a cyclotron of 30 MeV, imported from Belgium, consequently gallium-68, thallium-201, indium-111, iodine-123 are all available for production. There is currently one operating PET camera facility in China, in the Shandong province. A second PET/cyclotron facility is currently being developed in the Nuclear Medicine Department, Huashan Hospital, Shanghai Medical University. The most common clinical Nuclear Medicine applications are in oncological, cardiovascular, cerebrovascular and neuropsychiatric disorders

No abstract available

No abstract available

[en] This patent describes a method of fabricating an article comprising a quantity of a re-solidified copper-containing superconductive oxide, the method it comprises: providing a quantity of oxide-containing precursor material; and heating the precursor material such that at least a portion of the precursor material becomes a liquid, and causing resolidification of the liquid precursor material such that the resolidified material comprises elongate crystallites, associated with the crystallites being a long axis and an aspect ratio, the long axis being at least 10 μm and the aspect ratio being at least 10:1

[en] In order to analyze and study the factors about Logistics distribution system, solve the problems of out of stock on the production line and improve the efficiency of the assembly line. Using the method of industrial engineering, put forward the optimization scheme of distribution system. The simulation model of logistics distribution system for engine assembly line was build based on Witness software. The optimization plan is efficient to improve Logistics distribution efficiency, production of assembly line efficiency and reduce the storage of production line. Based on the study of the modeling and simulation of engine production logistics distribution system, the result reflects some influence factors about production logistics system, which has reference value to improving the efficiency of the production line. (Author)

[en] This paper describes a method of fabricating a body that comprises a superconductive oxide of nominal composition Ba_2-zM_1-yX_x+yCu₃O_7+δ where M is selected from the group consisting of Y Eu, La, and combinations thereof, the optional X is different from Ba and M and is selected from the group consisting of the elements of atomic number 57-71, Sc, Ca and Sr, with 0 ≤ x + y ≤ 1 and 0 ≤ δ ≤ 0.5, and with Ba and M being at least 50% unsubstituted. It comprises: providing a quantity of precursor material comprising an oxide of one or more of Ba, Cu, M and X, associated with the precursor material is a phase diagram comprising a solid-liquid region and a liquid regions, and a solidus temperature; heating the precursor material such that at least a portion thereof is at a temperature above the solidus temperature and is a liquid; cooling at least a part of the liquid precursor material to a temperature below the solidus temperature such that re-solidified precursor material results, the rate of cooling selected such that at least a substantial portion of the re-solidified precursor material comprise elongate grains, associated with a given elongate grain being a long axis and an aspect ratio, at least a substantial fraction of the elongate grains measuring at least about 10 μm along the long axis and having an aspect ratio of at least 10:1: and heat treating the re-solidified precursor material in an oxygen-containing atmosphere such that the superconductive oxide is produced from the re-solidified precursor material

[en] Alternation of austenitization and austenite + ferrite two-phase decomposition treatment in a cyclic thermal treatment allows the achievement of ultra-fine grain size in steels containing 8-12% Ni. The grain refinement leads to a substantial improvement in cryogenic mechanical properties. The ductile-brittle transition temperature of a ferritic Fe-12Ni-0.25Ti alloy was suppressed to below liquid helium temperature by this grain refinement procedure; the transition temperature of commercial ''9Ni'' cryogenic steel was similarly reduced by combining the grain refinement with a final temper which introduces a small admixture of retained austenite

[en] A nickel-free Fe-12 Mn-0.2 Ti alloy steel was investigated for cryogenic applications. The systematic control of the grain size and the microstructural distribution of the retained γ phase was made through α + γ heat treatments in combination with mechanical working. Substantial improvements of important low temperature mechanical properties were obtained by these processings. Our results indicated a good possibility of developing a new, inexpensive cryogenic steel

[en] The presence of retained austenite suppresses the ductile-brittle transition temperature of the 9Ni steel (containing 0.1 percent carbon) in both impact testing and fracture toughness testing. However, in an interstitial-free Fe--8Ni--2Mn--0.25Ti steel, the benefit of retained austenite is seen only in impact testing, and little improvement in fracture toughness is observed. The stabilities of retained austenite in both alloy systems are compared in terms of chemical compositions and strain rate. The implications on the role of retained austenite are discussed

[en] The recent discovery of the YBa/sub 2/Cu/sub 3/O/sub 7-δ/ type high T/sub c/ superconductors simulated worldwide R and D interest in this field. However, the relatively low critical current density (J/sub c/) in the polycrystalline, bulk superconductors (as well as its significant deterioration in weak magnetic fields) has been a major roadblock to the rapid advancement toward applications. In this paper, the authors investigate the effect of processing and microstructural control on J/sub c/ of the superconductor. Improved J/sub c/ values of -- 3100 A/cm/sup 2/ at 77K with somewhat reduced field dependence have been obtained through appropriate microstructural modifications