Retention of radium from thermal waters on sand filters and adsorbents

This study was focussed on laboratory experiences of retention of radium from one thermal water on sand filters and adsorbents, trying to find an easy method for the elimination in drinkable waters polluted with this natural radio-nuclide. A thermal water from Cantabria (Spain) was selected for this work. Retention experiences were made with columns of 35 mm of diameter containing 15 cm layers of washed river sand or 4 cm layers of zeolite A3, passing known volumes of thermal water at flows between 4 and 40 ml/min with control of the retained radium by determining the amount in the water after the treatment. The statistical analysis of data suggests that retention depends on the flow and the volume passed through the columns. As additional adsorbents were used kaolin and a clay rich in illite. Jar-test experiences were made agitating known weights of adsorbents with the selected thermal water, with addition of flocculants and determination of radium in filtrated water after the treatment. Data suggest that retention is related to the weight of adsorbent used, but important quantities of radium seem remain in solution for higher amounts of adsorbents, according to the statistical treatment of data. The elution of retained radium from columns or adsorbents, previously used in experiences, should be the aim of a future research.     

钢管倒棱机的设计研究

为了适应钢管制造业的发展 ,有必要设计先进的钢管倒棱机。为此 ,从国内外倒棱机的典型结构入手 ,阐述了倒棱机的整机布置方案、动力传动方式、夹紧装置类型、随动切削头设计及控制系统设计等技术发展现状。在分析对比各设计项目优缺点的基础上 ,指出对于高质量的钢管生产用倒棱机 ,宜采用移动床头箱平移钢管式布置方式、左右侧向抱管式夹紧装置、径向浮动切削头、PLC控制以及灵活选用动力传动方式等设计方案     

渐开线圆柱齿轮倒棱刀设计

介绍了渐开线圆柱齿轮倒棱刀的设计原理和设计方法,提出了使用CAD软件进行倒棱刀切削仿真的方法,提高了复杂倒棱刀设计效率;介绍了几种特殊的倒棱刀设计方法,解决了有齿端台阶、齿端倒角、变棱边倒棱等特殊要求的产品倒棱刀设计难题。     

Evaluation of Neutron Nuclear Data for Z>88 Minor Nuclides

Neutron nuclear data for 15 minor nuclides (Z>88) have been evaluated in the energy range of 10^?5 eV–20 MeV. Since only few experimental data are available, the present evaluation was mainly based on the systematics of the data from neighboring nuclides and also optical and statistical model calculations. The evaluations have been carried out for neutron cross sections of total, elastic scattering, inelastic scattering, (n, 2n), (n, 3n), (n, 4n), fission and capture reactions. In addition, angular and energy distributions of the emitted neutrons and average number of the emitted neutrons per fission were also evaluated. The results were compiled in the ENDF/B-V format and stored in the JENDL-3.     

一种新型薄层电阻率测井(TBRt)的评价方法及应用

新研制的5700测井系列中的薄层电阻率TBRt（Thin Bed Resistivity）测井不仅有足够的垂向分辨率（5cm）,而且有足够的径向探测深度（33～35cm）,它能够提供完全不受围岩影响的,包括薄层在内的可信赖的地层电阻率。而在常规仪器中这二者常是相互制约的。因此,TBRt仪器能在薄层评价中显出其独特的优势。本文阐述了TBRt测井仪器的基本原理和响应特征（垂向分辨率和径向探测深度）,并列举了在河南油田的应用实例。     

模块化方形零件全自动双边倒角机的设计

方形零件,手工双边倒角效率低、一致性差,采用模块化设计方法研制的方形零件双边自动倒角机,可以实现一定尺寸范围内方形零件双边自动倒角,能调整刀具位置从而方便调节工件的双边倒角量,实现倒角一致性。介绍了方形零件双边自动倒角机系统组成及模块划分,倒角机的动作方案和一些关键零部件的设计。通过对样机进行试验,能到达预期效果。     

Radium and Thorium Sorption by Monosodium Titanate (MST) and Modified MST (mMST)

To confirm performance assessment inputs for the Saltstone Facility at the Savannah River Site (SRS), a series of experiments were performed to examine the removal of Ra and Th by monosodium titanate (MST) and modified MST (mMST). The solubility of Th in the simulated high-level waste solutions was found to be extremely low; therefore, its removal by MST could not be measured. Radium was rapidly removed from the high-level waste simulant by both MST and mMST.     

基于PLC的倒角机自动控制系统设计与研究

针对手工倒角劳动强度高、加工效率低的现状,开发了一台自动倒角机,采用基于PLC的控制系统,对倒角工序进行顺序控制,实现连续循环加工,以提高生产效率.该系统可对细长棒料两端同时倒角,并且可以通过触摸屏设定工件直径和切削量,以满足不同直径工件的倒角要求.利用光电开关准确感应工件的位置,通过相关的控制程序自动补偿工件长度误差和送料定位误差,从而实现快速、高效与高精度的倒角.     

Tool path generation for chamfering drill holes of a pipe with constant width

When drilling circular holes into metal circular pipes, burr is generated at the hole entrance as well as at the hole exit. The burrs generated at the edge curves associated with the outer and inner pipe surfaces must be removed by constant chamfering. Geometrically, the two edge curves can be defined as cylinder-to-pipe intersection curves. In this paper, we employ differential geometric properties of the surface-to-surface intersection curves in order to generate an interference-free tool path with constant chamfering for a ball-end cutter. We demonstrate the effectiveness of our method by conducting experiments with physical pipe models.     

倒棱机床身进给伺服控制系统的改进

为了解决焊管生产线原倒棱机设备控制性能较差、故障率高的问题,对原倒棱机采用的变频器驱动普通三相异步电动机进给伺服控制系统进行了改造。新系统选用西门子S120控制器作为驱动单元、西门子伺服电机作为执行机构,设计了两侧床身进给伺服控制电气原理图,编写了S7-300PLC控制程序,利用DP总线通讯进行信号和数据传输,并对S120伺服控制系统进行了安装调试。实际使用结果表明,改进后的设备性能良好,运行平稳,提高了生产效率和产品质量。