Man-made plutonium in environment — possible serious hazard for living species

It is pointed out that, contrary to the situation with natural Rn, the growing concentration of man-made Pu in environment — natural water soil plants and food — can provide the serious danger for all kind of animals and especially for mankind. Really, as it was established recently, element Pu is accumulated in human body during all the life and the dangerous concentration estimated to be 10⁻¹² – 10⁻¹³ grapm Pu per gram of human tissues. Unfortunately up to now there are no simple nonexpensive methods of Pu determination at the level of sensitivity 10⁻¹⁴ – 10¹⁵ g/g which can provide the determination of Pu even in 0.2 g of human tissue. We warn that now the average concentration of Pu in human body is not less than 10⁻¹⁴ g/g and much higher for some “hot” regions in Europe and Asia. We propose to discuss the problem of organizing world net exploration of Pu in environment — similarly to Rn exploration program — and personnel Pu monitoring for inhibitions of Pu damaged regions. Our approach to the problem is based on chemical separation of Pu, on determination of Plutonium by high fission cross section with thermal neutrons ²³⁹Pu(n,f) reaction and by control of possible admixture of ²³⁵U isotope by ²³⁸U(γ, f) reaction in Pu preparations. The problem of increasing of sensitivity of Pu analysis up to 10⁻¹⁴ – 10⁻¹⁵ g/g is discussed in detail.     

Absolute Continuity of Measures in the Class of Markov and Semi-Markov Processes of Diffusion Type

The property of absolute continuity of measures in the class of one-dimensional semi-Markov processes of diffusion type is investigated. The measure of such a process can be composed of two measures. The first one is a distribution of a random track, and the second one is a conditional distribution of a time run along the track. The desired density is represented in the form of product of two corresponding densities.     

First results of the CAKE experiment

We present the preliminary results of the cosmic abundances below the knee energies (CAKE) experiment for the study of the primary cosmic-ray composition and for the search of exotic particles in the primary cosmic radiation. CAKE uses CR39^® and Lexan nuclear track detectors, which were calibrated with beams of 158 AGeV Pb ions and 1 AGeV Fe ions at the CERN and BNL accelerators, respectively. Results based on the analysis of a first data sample are shown.     

北京谱仪触发效率的测量

介绍了用实验测量北京谱仪触发判选系统触发效率的方法．着重介绍触发条件表的设置，事例选择和触发效率的计算，给出各触发条件和不同类型事例的触发效率．     

江苏省第十五届运动会高校部田径比赛(甲组)战况分析及其思考

近年来全国高校试办高水平运动队已形成了一定的规模，然而在大学生运动会比赛中，有很多省份对特招运动员比赛不加限制，江苏就是其中之一。特招运动员与普通学生同场进行比赛的模式有待改变，只有把两者分开，才能体现目前大学生真正的体育竞技水平。     

计算机系统在田径比赛中的应用

随着计算机技术在体育领域的广泛应用，河北省研制开发了田径比赛计算机系统。经过多年的完善、更新，并结合不断出现的新技术、新设备，现已成为利用网络技术的多用户系统。本文着重介绍了这套系统的结构、功能及特点，并提出尚待解决的问题。     

罐盖圆边直径与卷边叠接率关系浅析

在番茄酱罐头生产现场经大量测试６５＃圆罐罐盖圆边数据，借助高速封口机进行密封试验，采用正交多项式回归方法建立了罐盖圆边直径与叠接率的关系回归方程。该方法通过生产实践证实效果良好，并以此为基础提出了一种罐盖圆边最佳常数，以供预测和优化不同罐径的罐盖的圆边参数。     

双嘧达莫治疗上呼吸道感染126例疗效观察

上呼吸道感染是最为常见的病毒感染性疾病。研究表明双嘧达莫对多种ＲＮＡ病毒及某些ＤＮＡ病毒的增殖有明显抑制作用。本文报道了应用双达莫治疗上呼吸道感染１２６例，并与甲烯土霉素加病毒灵治疗上呼吸道感染作对照。结果，双嘧达莫治疗组在退热、减轻症状、缩短病程等方面明显优于甲烯土霉素加病毒灵对照组。说明双嘧达莫治疗上呼吸道感染具有疗效好、毒副作用小、经济实用，值得进一步推广。     

田径教学方法的选择与运用

本文结合多年田径教学经验,提出了教学手段的选用要具有的科学性、系统性、针对性、实效性、趣味性。     

试论高校课余田径训练的科学化

从当前高校运动员的实际情况出发，探讨课余训练的客观规律性。文中指出：提高高校课余训练的科学化程度要运用辩证法的观点、运动心理学原理以及运动生理学原理来指导训练，注重提高教练员指导训练的思想与技术本身的科学化水平和职业道德与教育心理科学的水准。