用阈探测器活化法测量50MeV/u重离子实验靶区的中子注量率、能谱和中子产额

用阈探测器中子活化法测量了50MeV/u ~(12)C离子实验靶区的次级中子平均注量率、角分布、粗略能谱,并估算了重离子反应的中子产额。     

低温向上倾斜管内Taylor泡初始形成位置分布的实验研究

An experimental study was carried out to understand the phenomena of the boiling flow of liquid nitrogen in inclined tubes with closed bottom by using the high speed digital camera. The tubes in the experiment are 0.018 m and 0.014 m in inner diameter and 1.0 m in length. The range of the inclination angles is 0-45° from the vertical. The statistical method is employed to analyze the experimental data. The experiment was focused on the effect of the inclination angle on the initial position distribution of Taylor bubbles. The formation criterion of Taylor bubbles was confirmed by analyzing the images of Taylor bubbles. The experimental results show that the initial position of Taylor bubble increased first, and then decreased with the increasing inclination angle, with the maximum at 30°. The standard deviation of the initial position of Taylor bubble in tubes was different with different inner diameters. The lognormal shape was fitted to the measured the initial position distributions of Taylor bubbles in the cryogenic tubes.     

14MeV中子活化分析灵敏度的测定

我们利用600kV中子发生器,自制快速跑兔系统和高纯锗探测器(体积为75cm~3),对三个样品中的15种元素的14MeV中子活化分析灵敏度进行了测定。在本实验中灵敏度计算公式为:     

75 MeV/u~(12)C离子束在辐射生物实验区产生的中子角分布

本文应用Ａｌ为阈探测器在兰州重离子研究装置（ＨＩＲＦＬ）的辐照终端上研究了７５ＭｅＶ／ｕ１２Ｃ离子束在辐射生物实验区产生的能量大于６ＭｅＶ的中子角分布。实验中束流经２４μｍ的Ｎｉ窗及由１０μｍ镀金的Ｍｙｌａｒ膜组成的平行板电离室后进入实验区,７个２０ｍｍ×５ｍｍ的阈探测器放置在距Ｎｉ窗２５ｃｍ处的不同角度上（６．５°～３６．０°）,束流强度为３ｎＡ,活化样品测量用高纯锗探测器。结果表明,实验区产生的中子具有明显的前冲分布,测得的中子注量率分布,在与束流方向夹角６．５°～３６．０°范围内,大致呈指数衰减。这为进一步开展的重离子治癌研究提供了辐射防护的实验依据。     

非线性拱梁分载法

提出了弹塑性拱梁分载法,它可以对拱坝承载能力(包括超载系数和坝体强度储备系数)进行计算,还可以模拟拱坝的破坏过程。根据提出的数学—力学模型,编制了相应的计算程序,并应用于李家峡拱坝和白云江周边缝拱坝的应力分析。     

废钢铁降本增效工作的几点措施

为摆脱困境,包钢废钢公司通过合理组织安排生产,加强内部废钢铁管理,开拓市场,改善加工设备等一系列措施以达到降低成本,提高企业经济效益的目的。     

山东省栖霞市泥石流灾害的 成生环境及危险性趋势分区评价

栖霞市是地质灾害多发区,主要地质灾害有泥石流、崩塌和滑坡,尤其是泥石流灾害频发,其 形成主要受自然地理环境、地质条件和人类经济活动影响。因而在地质灾害调查成果基础上,将泥石流 的发育频度、面积密度和规模进行了分级,采用袭扰系数法对区内泥石流灾害的危险性趋势进行了分区 评价,确定了泥石流灾害的高危区、中危区和低危区,为泥石流灾害防治提供了科学依据。     

同轴旋转分层流燃烧器一次风扩展角_的实验研究

运用CCD摄像机对同轴旋转分层流低NOx燃烧器出口空气动力特性进行了可视化研究,并对采集的图像和数据进行了一系列处理.对一次风扩展角α进行了定义,分析了一、二次风量比以及一、二次风叶片的位置对一次风扩展角α的影响,并对其变化规律进行了研究,为同轴旋转分层流燃烧器分层机理的研究打下了基础.     

预测小Eötvös数液-液分离流的压力梯度和平均界面含水率

The segregated flow pattern, which occurs in a 26.1 mm diameter, horizontal, stainless steel test section, is investigated. Pressure gradient and in situ phase distribution data were obtained for different combinations of phase superficial velocities ranging from 0.05 m.s^-1 to 0,96 m.s^-1. For the current small Eoetvoes number liquid-liquid system （EOD=4.77）, the dominant effect of interfacial tension and wall-wetting properties of the liquids over the gravity is considered. The approach introduces the closure relationship for the case of turbulent flow m a rough pipe, and attempts to modify the two-fluid model to account for the curved interface. In present flow rates range, wave amplitudes were found small, while interfacial mixing was observed. An adjustable definition for hydraulic diame- ters of two fluids and interfacial friction factor is adopted. The predicted pressure gradient and in situ phase distribution data have been compared with present experimental data and those reported in the literature.     

双喷嘴矩形导流管喷动床脱硫性能的研究

针对半干法烟气脱硫方法,提出了一种新型的双喷嘴矩形导流管喷动床半干法烟气脱硫装置。在不同的钙硫摩尔比、静床层高度、表观气速、绝热饱和温差下,以消石灰为脱硫剂,研究了该装置的脱硫性能,并与未加导流管的双喷嘴矩形喷动床的脱硫性能进行了比较;研究了不同脱硫剂流量下导流管喷动床的喷动压降。实验结果表明:脱硫率与钙硫摩尔比、静床层高度成正比,与绝热饱和温差、表观气速成反比;喷动压降与脱硫剂流量成反比。并最终得出了实验条件下双喷嘴矩形导流管喷动床的最佳操作范围和脱硫率关联式。