康山金矿地质地球化学特征及其成因

康山金矿产在豫西熊耳山古隆起区的结晶基底太华群和盖层中元古界熊耳群地层接触界面附近，矿体严格受构造破碎蚀变带控制。流体包裹体，稳定同位素等研究表明，成矿物质来自太华群变质岩，成矿流体的性质与变质热液截然不同，而与花岗岩浆热液相近似。该矿床的形成与燕山期发生的同构造－花岗岩浆期热液活动有关，金沉淀成矿阶段有大气水的混入。     

APPLICATION OF SITE-SPECIFIC NATURAL ISOTOPE FRACTIONATION (SNIF-NMR) OF HYDROGEN TO THE CHARACTERIZATION OF EUROPEAN BEERS

More than one hundred samples of European beers have been investigated by the new SNIF-NMR method which is based on 2H NMR at the natural abundance level and enables site-specific natural isotope fractionation factors in ethanol to be determined. The relative (R) and absolute (D/H)_i, parameters are shown to be characteristic of the country where the beers are brewed and the observed variations are explained in terms of cereal composition, water resource, and manufacturing processing (fermentation, yeast, temperature cycle). These new parameters find analytical and mechanistic applications in the identification of a beer and in the investigation of a fermentation process.     

Relationship of hydrocarbon and source-rock in Nos.3-5 tectonic belts of the Lenghu area, northern Qaidam Basin

Based on analyses of the components of crude oil hydrocarbons and carbon isotopes, the content of normal alkane de-creased from 49.00% to 20.10% when moving from the No.3 to No.5 tectonic belt of the Lenghu area of the Qaidam Basin, while cycloalkanes increased from 30.00% to 52.20% and aromatic and branch chain alkanes increased gradually as well. The maturity of sterane in crude oil is higher than that of its source-rock, which shows that the hydrocarbons were generated from a deep source-rock of high maturity around the tectonic belts of the Lenghu area. The analysis of the characteristics of carbon isotopes also shows that these isotopes of hydrocarbon compounds in the No.4 and No.5 tectonic belt are apparently heavier than those in the No.3 belt. The results of our research show that the hydrocarbons in the No.3 tectonic belt are mainly from a relatively rich sapropelic substance, while the hydrocarbons in the No.4 and No.5 tectonic belt originated mainly from organic matter of a rela-tively rich humic type substance.     

Leakage tests for Am solid sources used for liquid xenon detector monitoring

Experimental tests are described to check solid ²⁴¹Am radioactive sources used to monitor operation of liquid xenon detectors. In particular, radioactive leakage was tested in extreme temperature conditions following immersion in liquid nitrogen for different time periods. No radioactivity loss was detected from the sources considered. The paper describes the source characteristics, test methods and results obtained.     

钯钇合金膜分离器的氕氘分离系数测定

文章设计钯钇合金膜氢同位素分离器，并系统研究分离系数与温度、分流比、气体流速等因素间的关系。研究结果表明：分离系数随温度的增加而下降，在573～723K范围内，对于66.2%H2-33.8%D₂气体，当进料流速为5L/min、分流比为0.1时，分离系数由2.09下降至1.85；而当分流比为0.2时，分离系数由1.74下降至1.52。随着分流比的增大，分离系数逐渐降低。在573K下，进料流量为5L/min时，对于15.0%H2-85.0%D₂，当分流比由0.050增大至0.534时，分离系数由2.43降低至1.35；对于66.2%H2-33.8%D₂，当分流比由0.050上升至0.688时，分离系数由2.87下降至1.30。对于一定的分离过程，原料气体流速存在最佳值，达到该值时，分离系数最大。     

制氧机闲置的氪、氙回收设备的恢复利用

将三套全提取空气分离设备的氪氙系统进行组合,实现互联、互替,从而解决了其中一套氪氙系统设备因缺陷而不能生产的问题。     

高流速下钯上氢氘的排代研究

在钯氘化物上进行了高流速下氢氘的排代实验。结果表明，氘的排代效率随排代时间的增大而增加；与低压、低流速相比，高流速下排代压力的增加部分弥补了流速增大对氢氘交换速率的影响，因此仍可以得到较高的氘回收率。     

土壤样品的微波消解及其痕量铀的分析

对3个土壤样和2个放射性河床沉积物的国家标准物质进行了微波消解，又采用TOPO萃取和液体荧光法分析了样品中的铀含量，并将分析结果与国家标准方法GB11220．2-89的分析结果进行了比较。结果表明，微波消解法与国家标准方法一样，均不能实现土壤的全部消解，但与国家标准方法相比较，微波消解速度快，所需试剂量少，且易于实现定量控制，铀回收率高，分析精度高。对不溶物进行X射线能谱分析发现，其主要组成为铝、钛及过渡金属的氟化物或氧化物。同位素质谱分析表明，国家标准物质GBW08304中的^234U，^235U均比天然丰度低，另一个国家标准物质GBW08304a中铀的同位素分布与天然组成基本一致。     

离心机流场非稳态过程的初步数值模拟

摘要：从非稳态线性离心机流场运动方程出发，利用有限体积法，采用交错网格得到离散方程。通过数值求解得到了存在温度驱动情况下，离心机内形成小扰动流场的过程。从形成小扰动流场的非稳态过程可以看出扰动流场在开始和稳定阶段的影响因素不同，从温度引起的轴向压强的不平衡引起流动逐渐过渡到压强分布不同而引起的轴向环流。数值模拟为更好地研究离心机内流场的非稳态过程提供了依据。