Results 31 to 40 of about 659 (154)
Fushe yanjiu yu fushe gongyi xuebao硅橡胶因其优异的性能被广泛应用于核工业、航空航天等辐射环境，但辐射会导致其性能退化。本研究提出将香豆素基前荧光氮氧自由基（PC343）引入硅橡胶基体中，以同步实现辐射老化的防护与灵敏监测。通过溶胀法将PC343均匀引入硅橡胶（SR-P）中。电子顺磁共振波谱分析证实PC343能与硅橡胶被辐照后产生的自由基发生反应，展现出清除自由基的能力；气体红外分析进一步证明PC343能减少烷烃气体生成（吸收剂量1 kGy的SR-P烷烃产量较纯硅橡胶降低约40%），具有良好的辐射老化防护功能；荧光光谱显示 ...
黄 镇东 +6 more
doaj +1 more source
Clinical nursing care for Yttrium-90 resin microsphere selective internal radiation therapy on patients with hepatocellular carcinoma [PDF]
To summarize the perioperative nursing experiences of 8 patients with hepatocellular carcinoma (HCC) who received Yttrium-90 resin microsphere selective internal radiation therapy (90Y-SIRT) at the Affiliated Hospital of Southwest Medical University. Key
Bo LI, Jiangshan SHI, Lanting XU
core +1 more source
Current progress and the development of food contaminants standards in China [PDF]
, 2020 Food contaminant standards are an important way to control food contamination and ensure food safety. After more than 30 years of development, our food contaminant standards have been continuously improved, which have played an important role in ...
Yi SHAO, Yongning WU
core +1 more source
Cell Proliferation, Volume 57, Issue 4, April 2024.Our study reveals that MSCs derived from human adipose tissue exhibit cellular nuclear decondensation, reduced heterochromatin, thinning of the nuclear lamina, and increased expression of inflammatory regulatory factors in response to inflammatory factors stimuli.
Yunpeng Chu +11 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2020 目的探讨鸢尾苷元(tectorigenin)对辐射损伤小鼠造血系统的防护效果。方法雄性昆明小鼠随机分为5组,即正常对照组、辐照模型组和鸢尾苷元低、中、高剂量给药组。各给药组辐照前灌胃给药3d,对照组、模型组给予等体积溶媒。于第4d,除对照组外,其余各组小鼠均接受4Gy X射线全身性照射1次。辐照后继续灌胃,分别于第7、14、21、28d麻醉后经心脏采血,取胸腺、脾及骨髓,计算脏器指数,进行血常规、骨髓有核细胞数和DNA含量检测。结果鸢尾苷元给药组小鼠外周血白细胞、血小板 ...
王金凤 +5 more
doaj
Dianci bileiqi, 2022 防雷金属网主要用于碳纤维复合材料(CFRP)蒙皮雷电直接效应的防护，同时金属网和CFRP共同对高强度辐射场(HIRF)产生屏蔽效果。通过有限元仿真的方法，提取铺设有防雷金属网的CFRP蒙皮单元进行精细建模，设计二端同轴传输线屏蔽模型，采用S参数计算屏蔽效能(SE)。计算分析在HIRF环境下，铺设有防雷金属网CFRP蒙皮的SE。结果表明：1)防雷金属网在较低频段有较好的SE,随着频率增大，孔缝效应导致SE明显下降。当信号超过800 MHz时，SE低于40 dB,40 G时SE仅为6 dB左右；2 ...
王昭, 杜哲, 段雁超, 张培培
doaj
Investigation and Analysis of Radiation Dose and Typical Values in Adult Computed Tomography Examinations [PDF]
Objective: This study aimed to investigate the radiation dose levels and typical values of computed tomography (CT) devices in our unit, providing a basis for optimizing radiation protection.
Bin ZHANG +8 more
core +1 more source
Dianci bileiqi, 2021 针对舰船桅杆和高塔上的同轴线缆近距离耦合雷电电磁脉冲的问题,通过对同轴耦合理论的分析,建立同轴线缆近距离耦合雷电电磁脉冲的实验模型。采用组合波发生器模拟8/20μs雷电流波形,用长1 m直径16 mm的金属棒模拟雷电通道并作为辐射源,改变同轴线缆的长度以及距辐射源的距离进行试验。得出以下结论:同轴线缆近距离耦合雷电波时,线缆终端所得的电压波形仍为双指数波,在0.1～0.4μs有强烈的阻尼震荡,当线缆终端开路或接匹配电阻时,上升沿时间较短,约为1μs;当线缆终端屏蔽层接地时,上升沿时间变长,约为10μs ...
李祥超, 储蕾, 文巧莉, 欧阳文
doaj
The design and development for X-ray absorption spectrum measurement system [PDF]
, 2016 组织光学是生物医学光子学的理论基础，组织光学特性参数的测量是其最重要也最艰难的任务，生物组织在不同生理状态下的成分会发生变化，健康与病变组织对光的吸收和散射不同，其光学参数也会随着光的波长而变化，测定组织在不同生理状态下的光学参数就可以对疾病进行诊断甚至前期诊断，进而及时进行治疗。制约组织光学发展的一个很重要的因素就是，所用光源（紫外到红外波段）对组织的穿透能力有限，无法实现较深部位的探测，而X射线具有良好的穿透能力，因此把组织光学推广到X射线范围不失为一种疾病诊断的有效途径 ...
胡波
core
International Comparison Results of Personal Dose Equivalent Hp(0.07) and Hp(3) in Beta Radiation [PDF]
To establish the national primary standard for beta radiation tissue absorbed dose and to achieve international equivalence, the National Institute of Metrology (NIM) of China participated in the BIPM KCDB: EURAMET.RI(I)-S16 comparison that organized by ...
ZHANG Xuan1, 2, HUANG Jianwei1, LI Dehong1, , LIU Chuanfeng1, ZHANG Jian1, YANG Zhijun1, YANG Yang1
core +1 more source