26 research outputs found

    对河北省城镇居民贫困线的测算

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    贫困线的确定是正确反映一个国家和地区贫困状况的重要问题,因而得到众多学者的关注,提出了许多测算方法。本文利用扩展的线性支出法对河北省城镇居民的贫困线进行实证分析

    核废物所含剩余能量的综合利用

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    核反应堆产生的核废物带有大量的剩余能量,目前其不仅很少被利用,而且造成存放的困难。文章探讨了综合利用核废物的剩余核衰变能发电、发光和其它应用途径。简介了各种核衰变能发电机制、自发光光源的制作方法和同位素热源用于制氢及融解重油的应用设想,报道了有关辐射伏特效应发电机制研究结果

    辐射伏特效应核衰变能直接发电机制研究

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    本工作旨在通过对辐射伏特效应核衰变能直接发电机制的研究,探索一条综合利用核反应堆产生的放射性同位素的剩余能量,开发国内空白、国际尖端的高能高效航天及民用核电源的新途径。在理论上改进了利用辐射伏特效应实现带电粒子动能到电能的转换的物理思想,提出利用半导..

    辐射伏特效应用于核衰变能发电的初步研究

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    提出了利用半导体探测器的PN结内建电场收集辐射诱发电离空穴对,进而实现从核衰变能的电能转换的全新技术路线.成功地模拟了这一转换过程。在不加任何外场情况下,实现了对239Pu发射α粒子产生的电离电子空穴对高达94%的收集率和对90Sr-90Y发射β粒子产生的电离电子空穴对的72%收集率。实验能量转换率达12.2%(对β粒子)和16%(对α粒子)。The ladio-voltaic effect occuring in semiconductor elements was investigated for the tyansfer of radioisotopic decgy energy to electric power.The energy conversion processes were displayed in our experiments. It was shown that the collection ratio is 94% and 72% for the electron-hole pairs ionized by a particles from a 238pu source and by βparticles from a 90Sr source respectively. The energy conversion efficiency was about 16% for a particles and 12.2% for 0 particles.中国科学院青年基金,中国科学院兰州分院择优基金,中国科学院近代物理研究所所长基

    色谱法测定四氯化硅中微量硅-氢键化合物

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    <正> 光通信研究中,光纤含氢氧基量,对光的衰耗有着极为严重的影响。作为制作光纤的主要原料(四氯化硅)中存在的含氢化合物是氢氧基形成的重要原因之一。因此研究含氢化合物的测定方法,便成为光通信研究中的一个重要课题。文献虽对色谱法测定四氯化硅中含氢化合物的测定方法有过报导,但要求的条件很严,对仪器也有腐蚀问题,加之测定灵敏度也不理想,故有必要研究新的测定方法

    冷却储存环主环磁铁的准直测量

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    采用激光跟踪仪及配套带软件Insight对兰州重离子加速器冷却储存环主环磁铁进行了安装和准直。首先建立全局坐标系,用来确定从源体到实验环各子系统的理论原点的位置;而各个子系统又分别以各自的理论原点为基础建立局部坐标系,用来安装定位本系统内的各个元件;对各个子系统中的每一个元件还采用了元件坐标系。准直测量时,先在每块磁铁上焊接8个测量基准;然后对磁铁上的基准进行测量,以确定其在元件坐标系中的位置;再架设激光跟踪仪,测量主环控制网点,恢复主环局部坐标系,根据元件在主环局部坐标系中的位置及理论坐标,计算出相关的变换参数;转入元件坐标系,采用激光跟踪仪及Insight软件显示实时测量坐标及其与理论值之差,其精度达到0.15mm

    用于半导体探测器研制的数字影像显微系统

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    光学显微检测在半导体探测器研制的多个环节具有重要意义。利用较低价单元、部件组装了一套数字影像光学显微系统,性能与国外中档产品相当,性价比卓越。该系统拥有微机控制的高清晰数字摄影装置,配置大屏幕监视器,搭载高倍干系物镜,分辨率达到0.2μm,可以进行明暗场、偏光、干涉观测。它可以方便的用于缺陷、沾污控制,图形检测,表面光洁度检验,材料鉴定等方面,还可用于测试、封装、修理等精细操作。通过观察焊点的表面形貌,钎料合金的显微结构,可以鉴定焊点质量。如果结合多光束干涉技术可用于表面起伏的精细测量。论文叙述了该系统在半导体探测器研制上的应用,详述了其建造细节

    Method for liver tissue metabolic profiling based on liquid chromatography

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    Hepatocellular carcinoma (HCC) is one of the most frequent malignancy worldwide. Evaluation of tissue metabolites is with significant value in HCC study which can provide more direct information of metabolic disorder compared with biofluids. A protocol for the metabolic profiling of liver tissue was developed based on ultra-performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (UPLC Q-TOF/MS). According to the design of experiment (DOE), methanol/water (4:1, v:v) was selected as the optimal extraction solvent. The established method was validated with a linearity over the 10–5000 ng/mL for internal standards (IS) and got an average correlation coefficient of 0.9986. The intra-day and inter-day RSD for most endogenous compounds were below 15% and the recovery of IS was from 84.8% to 109.1%. After method validation, this method was applied to HCC study. Liver tissue samples were collected from HCC patients and each sample group involved carcinoma tissue, adjacent noncancerous tissue and distal noncancerous tissue, respectively. The data demonstrated that noncancerous tissues from the adjacent and distal were nearly identical, but were greatly different from the carcinoma tissue. After the removal of missing values, totally 880 significantly changed ions between the carcinoma tissue and distal noncancerous tissue group were filtered out. 44 metabolites in the ESI positive mode and 65 in the negative mode were identified by databases and some of them were further confirmed by authentic standard samples. Several important metabolic pathways were clarified. The result proved that the established method was adequate for liver and other tissues metabolic profiling analysis.Hepatocellular carcinoma (HCC) is one of the most frequent malignancy worldwide. Evaluation of tissue metabolites is with significant value in HCC study which can provide more direct information of metabolic disorder compared with biofluids. A protocol for the metabolic profiling of liver tissue was developed based on ultra-performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (UPLC Q-TOF/MS). According to the design of experiment (DOE), methanol/water (4:1, v:v) was selected as the optimal extraction solvent. The established method was validated with a linearity over the 10–5000 ng/mL for internal standards (IS) and got an average correlation coefficient of 0.9986. The intra-day and inter-day RSD for most endogenous compounds were below 15% and the recovery of IS was from 84.8% to 109.1%. After method validation, this method was applied to HCC study. Liver tissue samples were collected from HCC patients and each sample group involved carcinoma tissue, adjacent noncancerous tissue and distal noncancerous tissue, respectively. The data demonstrated that noncancerous tissues from the adjacent and distal were nearly identical, but were greatly different from the carcinoma tissue. After the removal of missing values, totally 880 significantly changed ions between the carcinoma tissue and distal noncancerous tissue group were filtered out. 44 metabolites in the ESI positive mode and 65 in the negative mode were identified by databases and some of them were further confirmed by authentic standard samples. Several important metabolic pathways were clarified. The result proved that the established method was adequate for liver and other tissues metabolic profiling analysis
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