Leakage tests for Am solid sources used for liquid xenon detector monitoring

Experimental tests are described to check solid ²⁴¹Am radioactive sources used to monitor operation of liquid xenon detectors. In particular, radioactive leakage was tested in extreme temperature conditions following immersion in liquid nitrogen for different time periods. No radioactivity loss was detected from the sources considered. The paper describes the source characteristics, test methods and results obtained.     

低温日用光泽透明釉的研制

研制了一种以硅灰石、锂辉石为主要助熔剂，烧结温度在1150℃的低温日用光泽透明釉，性能达到了国家标准。文章通过对其烧成过程和显微结构观测，探讨了其烧成机理，以及助熔剂在成釉过程中的作用。     

Cryobank of plant genetic resources in Russian Academy of Sciences

Cryopreservation is the most reliable method for long-term storage of plant genetic resources. A review of cell injury by ice crystals and dehydration during a freeze–thaw cycle is given. For successful regeneration of plants and cultures after cryopreservation of their cells, the development of reliable cryopreservation procedure is required including preliminary cultivation, treatment by cryoprotectors, freezing by different methods, thawing and recultivation. Up to now 27 cell lines successfully resumed their growth after storage in liquid nitrogen and preserved their specific features and biosynthetic potential. Besides, shoot tips of 40 cultivars of potato, rose, strawberry and raspberry regenerated plants both in vitro and in vivo after cryopreservation. The longest storage duration was 25 years. Now in liquid nitrogen we continuously store 24 cell strains of rare medicinal plants, shoot tips of seven cultivars of strawberry and raspberry and seeds of 250 endangered plant species collected over all Russian territory.     

Cryogenic electronic memory infrastructure for physically related “continuity of care records” of frozen cells

This paper describes low-temperature electronics for cryogenic applications, especially for a new technique for living-cell storage near liquid-nitrogen temperatures. Central is the reliable coupling of a sample carrier to cryo-tolerant electronics, particularly memory devices storing continuity of care records, lab workflows, and other useful documentation. We present (1) a two-year study of the performance and data retention of Flash-Memory devices in a controlled cryogenic environment, (2) a cryogenic multiplexer allowing multiple, cold Flash-Memories to share a communication channel, and (3) results for radio frequency identification tags immersed in liquid nitrogen.     

四川电网水电厂一次调频试验的探讨

中国部分省市电网目前正在分批开展发电机组的一次调频试验工作，实现水轮发电机组一次调频功能的主体是水轮机微机调速器。文中依据大量电站试验结果，详细叙述了水轮机调速器如何实现一次调频功能、一次调频对调速器的参数要求以及一次调频试验中需要注意的事项等。     

电子信息工程专业人才培养模式的研究与实践

人才培养模式体现在培养目标和培养内容上，结合实际介绍了我院电子信息工程专业的人才培养目标和课程体系设置的研究与实践。     

ns-200中子发生器束流脉冲化技术研究及束流传输模拟计算

在ns-200中子发生器上开展了束流脉冲化技术研究工作,采用正弦波速调管聚束方法设计了束流脉冲化系统,研制了高频电源系统、脉冲测量系统和远程自动控制系统.运用LEADS软件,进行了束流传输的模拟计算,并显示了束流传输包络曲线.整机安装调试获得了半高宽小于3.5ns、峰值电流大于1mA的聚束脉冲,束流稳定,各项指标达到技术要求.目前,已长期投入脉冲运行,完成了多个物理实验.     

充气飞行时间探测方法分析

本工作涉及充气飞行时间探测器的工作原理和实验测量结果。在不同能量(64、48和33MeV)下，利用充气飞行时间探测方法对同量异位素³⁶S和³⁶Cl进行鉴别，并与用传统的ΔE－E方法在相同能量下的鉴别结果进行比较。实验结果表明，在入射能量较高（E_i＞40MeV）时，ΔE－E法的鉴别能力比充气飞行时间法的稍好些；在E_i＜40MeV时，充气飞行时间法的鉴别能力比ΔE－E法的好，入射能量为20～40MeV时，充气飞行时间法能明显将³⁶S和³⁶Cl区分出来。