论周国桢陶艺之东西合璧

周国桢的动物雕塑陶艺具有东西方文化融合的特质,在其艺术生涯的不同阶段有不同的表现,主要体现在早期西方雕塑手法与中国民间题材的融合,中期中国古代高温颜色釉与现代雕塑艺术抽象形式的结合,晚期东方大写意雕塑精神与西方写实主义雕塑功底之融合,以及中国书法艺术与泥条盘筑、泥片成型之技法的结合,从而不断创新现代陶艺语言。     

On some queueing models of time division multiple access communication system

In this paper we consider a general queueing model for a time division multiple access communication channel and establish the relationship between the steady-state probability distribution of the number of packets in the buffer at various observation epochs. These results are derived using the theory of embedded Markov chain and discrete state level crossing analysis. We also provide a table describing the relationship between the results given here and the results available in the literature.     

X射线荧光光谱法测定铁矿石的化学成分

应用X射线荧光光谱法测定铁矿石中铁等多种元素时,采用了熔融片制样,以消除矿物结构效应,降低基体效应的影响。并研究了熔样的条件,确定了仪器最佳参数,然后建立工作曲线。实验证明,本法快速、准确,能很好地对铁矿石进行测定,不仅大大缩短了分析时间,提高了工作效率,而且降低了劳动强度。     

海平面上宇宙射线电离量的测定及其影响因素的讨论

用自制的圆柱形钢壁充氩高气压电离室在三个不同海拔高度的湖面上,测量了宇宙射线电离量,进而外推出海平面上宇宙射线电离量值为(2.13±0.13)I。又根据在渤海海域的直接测量数据,与上述值比较,得出在渤海测量时所乘钢制船体的γ放射性影响为0.43I(相当于0.74μR/h)。对于测量中若干影响因素进行了初步分析和讨论,认为周围环境物质(例如钢制船体)中天然放射性核素的γ放射性和常压(1atm.)电离室室壁的α发射是影响海平面上宇宙射线电离量数据一致性的两个主要因素。     

制定我国新辐射防护规定中值得研究的几个问题

本文描述了制定新辐射防护规定时值得研究的几个问题。１．明确规定人为活动引起的天然辐射照射的控制要求，包括地下矿山和矿物提取工业的职业照射，喷气飞机机组人员的职业照射，以及居室中氡的照射。２．明确和加强当前辐射防护工作需要解决问题的内容，包括流出物的控制，下水道中放射性物质的控制和监测。讨论了应用ＢＳＳ豁免标准时的某些问题。３．吸取国际辐射防护的新经验，其中特别是ＩＣＲＰ的推荐书和ＩＡＥＡ的标准和导     

Solid solubility of hydrogen in Pb83Li17 alloy: A preliminary investigation

Lead–lithium alloy Pb₈₃Li₁₇ (0.6 wt.% lithium) is a potential candidate to be used as a neutron multiplier, tritium (fuel) breeder and heat transfer agent (coolant) in the International Thermonuclear Experimental Test Reactor (ITER). The tritium produced in the alloy could be soluble in the alloy or appear as a new phase. During reactor shut down condition, Pb₈₃Li₁₇ will be solidified and stored in a storage tank. Investigation on the solubility of tritium in solid Pb₈₃Li₁₇ is essential to quantify the trapped tritium in solid Pb₈₃Li₁₇ alloy to estimate the extent of radioactive contamination (with respect to tritium) and valuable tritium loss. Tritium being the isotope of hydrogen behaves more or less similar to hydrogen. In the present study solid-solubility of hydrogen in Pb₈₃Li₁₇ alloy has been investigated as a function of temperature and pressure. It was found that the hydrogen solubility increases with temperature (373–473 K) and follows the Sieverts law. Hydrogen solution enthalpy has been calculated using Seiverts constant and found to be −4.81 kJ/mole of hydrogen.     

Investigations on the level dyeing of fabrics in supercritical carbon dioxide

The level dyeing of fabrics in supercritical carbon dioxide was investigated by employing an improved beam (a perforated pipe on which the knitted or woven fabric/warp is wound around). The effects of system temperature, pressure, dyeing time, a time ratio of fluid circulation to static dyeing (R_time), different fabric layers wrapped around the beam, and the species and chemical structures of dyestuffs on leveling properties and color strength of polyester and cotton fabrics were observed. The results show that the leveling properties and color strength of fabrics were improved on the new beam, as well as with a favorably increased system temperature, pressure, dyeing time, and a time ratio of fluid circulation to static dyeing; while the leveling property and color strength decreased with fabric layers on the beam under an identical condition. Highly leveling results were obtained on polyester and cotton fabrics with disperse and reactive disperse dyes involving different chemical structures.     

储油罐人工检尺装置优化改进

针对坪北经理部储油罐人工检尺装置(以下简称量油管)在实际使用过程中出现的问题,对原有的量油管进行优化改造,成功推广应用新的量油管。改造后的量油管在使用过程中真实的反映储油罐中原油含水率、界位、液位的实际情况,以及储油罐中原油的实际品质,取得了较好的使用效果。     

基于四叉树直角坐标网格的运动界面追踪方法

运动界面的追踪是两相流模拟中需要解决的主要问题之一。基于四叉树直角坐标网格实现了Level set界面追踪方法和网格的局部自适应控制。通过模拟3个给定速度场（平移流场、旋转流场、剪切流场）的运动界面追踪问题,证明了自适应四叉树直角坐标网格与Level set方法结合的优势。