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In this paper we used seven 4 months old China experimental miniature pigs(CEMP) as experimental animals,and radioimmunoassay and biochemicalassay to studythe effect of compound sodium chloride powder(CSCP)on high temperature(30~33℃),persistent 4 hours transport stress piglets. The result was that CSCP made serumtotaI protein of high temperature transport CEMP be higher than that of the controlgroup(P<0.01).BIood urea nitrogen(BUN)value had lowered in the experimentalgroup constantly(P<0.05), the... In this paper we used seven 4 months old China experimental miniature pigs(CEMP) as experimental animals,and radioimmunoassay and biochemicalassay to studythe effect of compound sodium chloride powder(CSCP)on high temperature(30~33℃),persistent 4 hours transport stress piglets. The result was that CSCP made serumtotaI protein of high temperature transport CEMP be higher than that of the controlgroup(P<0.01).BIood urea nitrogen(BUN)value had lowered in the experimentalgroup constantly(P<0.05), the activities of serum creatine kinase(CK),lactate dehy-drogenase(LDH),aspartate aminotransferase(AST) and concentrations of cortisol,blood lactic acid were not statistically different(P>0.05) in the experimental groupin whole experiments.It is concluded that CSCP effect blood biochemical parameters,and keep acid base balance, and so CSCP can control stress. 本试验以4个月龄中国实验用小型猪7头为实验动物,用放射免疫分析和生化分析法,探讨服用复方氯化钠散对仔猪高气温(30~33℃),持续4h运输应激的防治作用及其机理。结果服用复方氯化钠散使高气温送输小型猪血清总蛋白含量增加(P<0.01),血清尿素氮(BUN)下降(P<0.05),使血清肌酸激酶(CK)、乳酸脱氢酶(LDH)、天门冬氨酸转氨酶(AST)、血清皮质醇和血液乳酸含量,在整个实验过程中变化不大(P>0.05)。表明复方氯化钠散可通过这些途径或方面,对仔猪高气温运输应激产生防治作用。 The theoretical models of a program NDHEXB for fast reactor burnup calculations isdescribed.The numerical results of China Experimental Fast Reactor(CEFR)are given and com-pared with the results of the code CITATION,They are about same,In the program NDHEXB,the neutron diffusion equation is solved by a nodal expansion method in hexagonal geometry andthe burnup equation by a kind of numerical methods for differential equations. 描述了快堆燃耗计算程序NDHEXB的理论模型,并给出了中国实验快堆(CEFR)的计算结果。结果表明NDHEXB具有良好的计算效率与精度。在NDHEXB程序中,采用六角形几何下的节块展开法求解中子扩散方程,利用常微分方程的一种数值方法——梯形法求解燃耗方程。 When sodium is used as a coolant in China Experimental Fast Reactor, the lithium content in sodium has an effect on the nuclear property of reactor. A method has been developed to determine the trace lithium in sodium metal at the level of less than ten parts per million. About 0. 4 g sodium is placed into a high-purity tantalum crucible, then it is placed in a stainless-steel still to distill at 360C under vacuum (0. 01 Pa). After the sodium has been removed, the residue is dissolved by nitric acid (1... When sodium is used as a coolant in China Experimental Fast Reactor, the lithium content in sodium has an effect on the nuclear property of reactor. A method has been developed to determine the trace lithium in sodium metal at the level of less than ten parts per million. About 0. 4 g sodium is placed into a high-purity tantalum crucible, then it is placed in a stainless-steel still to distill at 360C under vacuum (0. 01 Pa). After the sodium has been removed, the residue is dissolved by nitric acid (1 : 2) and analyzed with Graphite Furnace Atomic Absorption Spectroscopy at 671. 0 nm wavelength. The distillation conditions, working conditions of the instrument and interferences from matrix sodium, acid and concomitant elements have been studied. Standard addition experiments are carried out with lithium chloride and lithium nitrate. The percentage recoveries are 96.8% and 97. 4% respectively. The relative standard deviation is less than +5%. The method has been used to determine lithium content in high pure sodium and industrial grade sodium. 快堆用钠冷却剂中锂的含量对堆的核性能有较大影响,为了检测核级钠中锂的含量,建立了真空蒸馏-石墨炉原子吸收光谱法测定金属钠中微量锂的方法。在氩气氛下取4.0g左右钠于钽坩埚中,在360℃及0.01Pa真空度下蒸馏除钠,残渣用硝酸(1:2)溶解后,在671.0nm波长处,用石墨炉原子吸收光谱法测定锂。实验中对蒸馏条件、石墨炉原子吸收测试条件及来自于基体钠、酸及共存元素的干扰等进行了一系列研究,用氯化锂和硝酸锂做加钠回收实验,回收率分别为96.8%及97.4%,相对标准偏差小于5%。该方法满足了核级钠中杂质锂(<1×10~(-5))的质量监测要求,达到了国际上同类分析方法的水平,已用于国产工业钠原料和净化后的高纯钠中锂含量的分析。
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