Design and fabrication of lutetium aluminum silicate glass and nanostructured glass for radiation detection

Flexible scintillating fiber plays an important role in X-ray radiation monitoring and high-resolution medical imaging, while construction of scintillating fiber derived from the commercial material system meet with limited success. Here, we report the design and successful fabrication of the Ce-activated lutetium aluminum silicate glass, nanostructured glass, and fiber, and explore their scintillating properties. The scintillating glass with optimized composition and optical properties is determined. The crystallization behavior of lutetium aluminum silicate glass is studied and the nanostructured glass embedded with orthorhombic Lu₂Si₂O₇ phase is successfully constructed for the first time. Importantly, the crystalline layer thickness of the nanostructured glass can be finely tuned and ~172.89% enhancement in the scintillating performance can be achieved. Furthermore, the fiber with large sized core is fabricated and its radiation response properties are tested. The results show that it exhibits high sensitivity and its scintillating emission is lineally dependent on the X-ray power, indicating the potential application for radiation detection.     

《新编鲁般营造正式》中的门尺法研究

《新编鲁般营造正式》中详细记载了门尺法的原理和应用,分析其应用规则,以此为线索解读民间传统匠人的营造技术和营造思想。     

海岸寓言二则

本文通过介绍两位大连本地作家的艺术作品,旨在展示海岸作为海陆交汇处各种生物栖息地的本来面目,也试图揭示这个地带从人与自然相互依存的关系到被压挤成为社会结构日益单一、界面粗暴的"线"的过程.     

高3618块火烧油层试验效果跟踪研究

利用动态分析、数值模拟等方法,跟踪分析高升油田高3618块火烧油层试验过程中火井注入压力、油井生产状况、油层含油饱和度及温度压力等变化规律,分析认为试验取得了一定效果.目前火井全部点火成功并处于高温氧化燃烧状态,地下火线逐步推进,油藏温场逐步建立,油井普遍受效并具有一定增油量,油藏含油饱和度变化显示重力泄油特点,注采井...     

基于数据挖掘的蒸汽吞吐井注采参数优化设计

针对高升油田高3块蒸汽吞吐开发效果越来越差,基于高3块稠油油藏地质条件和蒸汽吞吐开发生产动态资料,运用灰色关联分析方法对影响蒸汽吞吐周期产油量的7个主要因素进行敏感性分析,敏感程度由大到小依次为油层厚度、周期数、周期注汽量、注汽压力、注汽温度、注汽干度、焖井时间;运用多元二次逐步回归方法,建立了周期产油量与7个主要因素...     

卢作孚的科学教育思想与实践探析

卢作孚是我国近代著名的爱国实业家。纵观卢作孚的一生,可以发现他也是一位功勋卓著的教育家和科学传播者。在现有文献资料的基础上,分析了卢作孚科学教育思想的形成,归纳了卢作孚科学教育内容和实践,并从这两个方面出发,对卢作孚科学教育思想进行了评价。     

Superior self-paced memorization of digits in spite of a normal digit span: The structure of a memorist’s skill.

Over the last century many individuals with exceptional memory have been studied and tested in the laboratory. This article studies Chao Lu, who set a Guinness World Record by memorizing 67,890 decimals of pi. Chao Lu’s superior self-paced memorization of digits is shown through analyses of study times and verbal reports to be mediated by mnemonic encoding and retrieval processes. Furthermore, Chao Lu’s development of his superior memory for decimals of pi is consistent with his engagement in thousands of hours of memorization. In contrast to most other studied memorists, who have digit spans over 15 digits, Chao Lu exhibited a digit span in only the normal range. Implications for different types of memorization skills and associated practice activities are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Activation cross sections of the Yb(p,xn)Lu reaction for indirect production of the therapeutic radionuclide Yb

Activation cross sections of the ^natYb(p,xn)¹⁶⁹Lu reaction have been measured for the first time up to 70 MeV to investigate the production possibility of the radionuclide ¹⁶⁹Yb through decay of its parent ¹⁶⁹Lu. The cross sections were measured using the stacked foil irradiation technique and gamma spectrometry. The experimental data were compared with the results of the ALICE-IPPE theoretical model code. Different production routes were compared for the internal radiotherapy related radioisotope ¹⁶⁹Yb. Above 30 MeV proton energy the integral yield of the ^natYb(p,xn)¹⁶⁹Lu reaction is higher than that of the earlier investigated ¹⁶⁹Tm(p,n)¹⁶⁹Yb, ¹⁶⁹Tm(d,2n)¹⁶⁹Yb, ^natEr(α,xn)¹⁶⁹Yb, ^natYb(α,x)¹⁶⁹Lu and ^natHf(p,x)¹⁶⁹Lu reactions at the equivalent particle energies.     

潞安矿区构造裂隙分布特征的实测分析

在地下采矿工程中 ,构造裂隙分布特征对回采工作面顶板移动冒落规律与巷道的稳定性有很大影响 ,受区域地质构造控制的裂隙分布状况即裂隙组数、间距、倾角和展布方位 ,各组裂隙的相互关系决定着裂隙的发育程度 ,而裂隙的空间分布特征、发育程度及其裂隙分布与工作面布置或巷道轴向布置的匹配关系 ,将直接影响工作面的快速安全生产和巷道围岩收敛变形规律与维护稳定 ,通过潞安矿区三个矿井的构造裂隙现场实测 ,分析了不同矿井的构造裂隙优势展布方位 ,比较发育程度差异 ,为评价裂隙分布对巷道稳定性的影响程度奠定了坚实基础