一种新型功能性显影促进剂的合成及表征

合成了以2—氨基—5—巯基—1，3，4—噻二唑为吸附基团，4，4—二甲基—1—苯基—3—吡唑啉酮为增强基团的新型功能性显影促进剂，其结构经IR、^1H—NMR、MS和元素分析等得到确证．由于其结构的独特性，可望在促进显影的同时而不导致灰雾增大．可将其直接用来促进显影，或者将其与卤代成色剂母体反应得到DAR成色剂后再用于促进显影。     

叔丁胺的生产与发展

介绍了国内外叔丁胺的发展现状、主要生产方法和用途。建议国内和ＭＴＢＥ－ＨＣＮ工艺生产叔丁胺，以满足ＮＳ不断发展的需求。     

电子加速器生产医用同位素钼-99的发展现状与展望

99 Mo的衰变子体99m Tc是核医学领域中应用最广泛的放射性同位素,近年全球主要的99 Mo生产堆面临着非计划检修及关停退役等问题,导致其供应不稳定,因此多个发达国家已在积极开发99 Mo生产的替代性技术.本文介绍了多种利用粒子加速器代替反应堆生产99 Mo的技术路线,总结了电子加速器生产99 Mo的国内外研究进展...     

大功率速调管的技术现状和研究进展

本文介绍了大功率速调管的技术现状、发展动态和应用情况,介绍了我国在该领域开展的主要研究工作和取得的主要研究进展,并对速调管技术的发展进行了展望。     

正弦波速调管聚束理论及其应用

以正弦波速调管聚束理论为基础。详尽阐述了速调管聚束的具体实现方法,给出了相应的计算公式。实际应用该法,为NS-200加速器设计了聚束装置。     

同态加密的硬件卸载及其在隐私保护计算中的应用

同态加密可以满足计算外包、数据共享、数据交易等应用对隐私保护计算的需要,但是同态加密的高计算开销限制了它在实际生产中的应用.本文从硬件卸载的角度解决同态加密的高性能计算问题,基于Intel QAT加速卡实现了一个半同态加密的高性能异步卸载框架QHCS.QHCS通过重构同态加密应用的软件栈来实现高效的异步卸载,并通过引入...     

电子加速器房扩容技改的辐射屏蔽设计

介绍了电子加速器房扩容技巧的辐射屏蔽设计,计算和验证结果,技改方案包括：加速器升级;增设耳房式迷宫以安装回转式工件传送装置,在耳房内增设局部屏蔽砼块以增强屏蔽表能力,在加速器运行条件下现场环境辐射水平实测结果与计算机结果与基本相符。     

An upgraded high-velocity dust particle accelerator at Concordia College in Moorhead, Minnesota

In 1975, Concordia College in Moorhead, Minnesota acquired a 2 MeV dust particle accelerator from NASA/GSFC that was used to test the lunar ejecta and micrometeorite (LEAM) experiment flown on Apollo 17. This high-speed dust particle accelerator is still fully functional and is currently being upgraded. Improvements to the electronic detection system have been undertaken including a computer-based, data acquisition system and new particle detection sensor electronics. These sensors have additional amplifiers that extend the range of charge detection to 1×10⁻¹² C allowing for the detection of larger particles. Improvements to the vacuum system have also been made. The accelerator beam line is now pumped with an oil-free, turbomolecular pump reducing possible problems with hydrocarbon contamination. In this work, we describe the facility, and outline some of the recent improvements to the dust particle accelerator and discuss its capabilities and limitations. We also summarize some of the recent experiments conducted using the facility.     

ADS次临界反应堆的中子共轭方程

与临界反应堆相比,ADS次临界反应堆的外源中子和裂变中子的空间分布具有严重的不均匀性,对应的中子价值也不同。本工作对次临界反应堆的稳态输运方程作分群扩散近似,得到了多群方程,进一步推导出按堆芯功率归一化的中子共轭方程表达式和与功率相关的中子价值函数表达式,给出了次临界反应堆中子价值的物理意义。由稳态中子共轭方程组出发,给出了两种带外加中子源的次临界反应堆增殖因数的表达式。     

Synthesis of a Distributed Recording Circuit for a Time-of-Flight Velocity Meter with Adapation of the Setting Intervals of Sensors

A systematic technique is proposed for synthesizing a distributed recording circuit for a time-of-flight type of velocity measuring system. The technique is based on the criterion of minimum sum of methodic error in the indirect determination of the instantaneous velocity and the error of measurement of the average velocity along a portion of the path. The expressions obtained can be used to determine the optimal value of the intervals between neighboring sensors and to estimate the errors of measurement. It is shown that the interval between sensors should be variable, with an adaptation to the results of the measurement on the preceding interval along the path.