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炭纤维底衬不锈钢气体测量源盒的研制 被引量:4
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作者 王世联 王军 +4 位作者 李奇 常印忠 樊元庆 陈占营 刘蜀疆 《核电子学与探测技术》 CAS CSCD 北大核心 2010年第1期27-30,38,共5页
描述了炭纤维底衬不锈钢气体源盒的研制和性能测试过程。在模拟计算气体源探测效率随几何形状变化的基础上,结合实际应用研制了炭纤维底衬不锈钢气体测量源盒,有效减小了源盒底部材质对气体氙同位素低能γ或X射线的吸收。对其进行性能... 描述了炭纤维底衬不锈钢气体源盒的研制和性能测试过程。在模拟计算气体源探测效率随几何形状变化的基础上,结合实际应用研制了炭纤维底衬不锈钢气体测量源盒,有效减小了源盒底部材质对气体氙同位素低能γ或X射线的吸收。对其进行性能测试表明,源盒在10pa至2.0atm压力范围内气密性良好,可用于气体样品的测量与研究。 展开更多
关键词 气体源盒 炭纤维 峰效率 吸收
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^(133)Ba活性炭滤盒自吸收修正方法研究 被引量:2
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作者 宋鑫鹏 夏文 +3 位作者 徐利军 陈克胜 李明 叶宏生 《同位素》 CAS 2019年第2期83-89,共7页
为了^(133)Ba滤盒体源活度的准确定值以及提高对碘监测仪探测效率刻度的准确性,本研究采用粒径为20~40目,堆积密度为0.47 g/cm^3的优质椰壳活性炭,对体源不同活性炭层厚度的自吸收修正进行研究。使用MCNP蒙卡模拟程序,计算面源在不同... 为了^(133)Ba滤盒体源活度的准确定值以及提高对碘监测仪探测效率刻度的准确性,本研究采用粒径为20~40目,堆积密度为0.47 g/cm^3的优质椰壳活性炭,对体源不同活性炭层厚度的自吸收修正进行研究。使用MCNP蒙卡模拟程序,计算面源在不同活性炭层厚度t下的探测效率ε_t,以及无填充介质时的探测效率ε_0,建立随活性炭层厚度变化的自吸收修正曲线F(t),并通过实验验证模拟计算结果的有效性。通过模拟计算与实验,得到了面源在不同活性炭层厚度下的活性炭自吸收修正因子F(t),结果表明,模拟计算与实验结果相差在1%左右符合。对于^(133)Ba的356 keVγ能点,得出滤盒中活性炭的自吸收修正因子F(t),给出了活性炭滤盒体源自吸收修正的技术方法,并采用自吸收修正因子F(t)对自制的^(133)Ba活性炭滤盒体源的自吸收修正进行了理论计算,与实验测量结果比较,两者在2%以内符合,可利用实验得到的自吸收修正曲线F(t)进行活性炭滤盒体源的自吸收修正。 展开更多
关键词 133Ba 活性炭 自吸收修正
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Design and Implementation of an FDP Chip 被引量:1
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作者 陈利光 王亚斌 +11 位作者 吴芳 来金梅 童家榕 张火文 屠睿 王建 王元 申秋实 余慧 黄均鼐 卢海舟 潘光华 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第4期713-718,共6页
A novel Fudan programmable logic chip (FDP) was designed and implemented with a SMIC 0. 18μm CMOS logic process. The new 3-LUT based logic cell circuit increases logic density about 11% compared with a traditional ... A novel Fudan programmable logic chip (FDP) was designed and implemented with a SMIC 0. 18μm CMOS logic process. The new 3-LUT based logic cell circuit increases logic density about 11% compared with a traditional 4-input LUT. The unique hierarchy routing fabrics and effective switch box optimize the routing wire segments and make it possible for different lengths to connect directly. The FDP contains 1,600 programmable logic cells, 160 programmable I/O, and 16kbit dual port block RAM. Its die size is 6. 104mm× 6. 620mm, with the package of QFP208. The hardware and software cooperation tests indicate that FDP chip works correctly and efficiently. 展开更多
关键词 FPGA programmable logic block programmable routing resource switch box
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光纤照明简介
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作者 李大友 《艺术科技》 1998年第1期47-52,共6页
关键词 光纤照明 源盒 技术参数 聚四氟乙烯 双色性 有效亮度 高层建筑 衰减率 最大长度 额定寿命
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长虹LMO2机芯典型维修流程图
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作者 罗华 《家庭电子》 2005年第11X期15-15,共1页
关键词 光栅 源盒 LMO2 屏幕 图像
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注射用替加环素中辅料乳糖杂蛋白研究 被引量:1
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作者 陈嘉璐 金鑫 +1 位作者 付龙 程刚 《中国处方药》 2021年第10期35-37,共3页
目的运用牛奶过敏源试剂盒法测定乳糖的杂蛋白含量。方法采用牛奶过敏源试剂盒规定的检测方法,分别对比日本WAKO和德国拜发公司生产的牛奶过敏源试剂盒。结果两种试剂盒均可检测出杂蛋白,日本试剂盒比德国试剂盒灵敏度高。结论所建立方... 目的运用牛奶过敏源试剂盒法测定乳糖的杂蛋白含量。方法采用牛奶过敏源试剂盒规定的检测方法,分别对比日本WAKO和德国拜发公司生产的牛奶过敏源试剂盒。结果两种试剂盒均可检测出杂蛋白,日本试剂盒比德国试剂盒灵敏度高。结论所建立方法准确、简便、检测成本低,可用于乳糖杂蛋白含量的测定。 展开更多
关键词 乳糖 杂蛋白含量 牛奶过敏试剂
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Effects of moxibustion on miRNA-133b,Pitx3/TH,and neurotransmitters in the midbrain of rats with diarrhea-predominant irritable bowel syndrome
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作者 CHEN Jinyu WANG Jiaojiao +6 位作者 ZOU Ling ZHU Shanshan LI Kuiwu LIAO Lumin RUAN Jingru CHU Haoran YANG Yanping 《Journal of Acupuncture and Tuina Science》 CSCD 2022年第6期433-445,共13页
Objective:To investigate the mechanism of moxibustion in the treatment of diarrhea-predominant irritable bowel syndrome(IBS-D),by observing the effects of moxibustion at Tianshu(ST25)and Shangjuxu(ST37)on microRNA-133... Objective:To investigate the mechanism of moxibustion in the treatment of diarrhea-predominant irritable bowel syndrome(IBS-D),by observing the effects of moxibustion at Tianshu(ST25)and Shangjuxu(ST37)on microRNA-133b(miRNA-133b),pituitary homeobox family factor 3(Pitx3)/tyrosine hydroxylase(TH),and neurotransmitters in the brain tissue of IBS-D rats.Methods:Healthy Sprague-Dawley rats were randomly divided into a normal group,a model group,a moxibustion group,and a Western medicine group,with 12 rats in each group.Except for the normal group,the IBS-D rat model was established by mother-offspring separation and acetic acid enema combined with restraint stress stimulation in all the other groups.No intervention was performed in the normal and model groups.Mild moxibustion was applied to both Tianshu(ST25)and Shangjuxu(ST37)in the moxibustion group.Rifaximin was given by gavage in the Western medicine group.The physical status of rats in each group was observed at different periods.After the intervention,hematoxylineosin staining was performed to observe the histopathological morphology of rat colon;enzyme-linked immunosorbent assay was used to measure the levels of dopamine(DA),noradrenaline(NE),and 5-hydroxytryptamine(5-HT)in plasma,colon,and midbrain tissue of rats;the relative expression levels of miRNA-133b,Pitx3 mRNA,and TH mRNA in the midbrain tissue were measured by real-time fluorescence quantitative polymerase chain reaction,and the relative expression levels of Pitx3 and TH proteins in the midbrain tissue were measured by Western blotting and immunofluorescence.Results:The body weights of rats among groups and at different time points were statistically different(P<0.01).The body weight of the normal group was higher than that of the other groups over time(P<0.01).After modeling,the minimum volume threshold of abdominal withdrawal reflex(AWR)was significantly lower(P<0.01)and the loose stool rate was significantly higher(P<0.01)in the model,moxibustion,and Western medicine groups compared with the normal group;the miRNA-133b expression in the midbrain tissue was significantly lower(P<0.01),the expression levels of Pitx3 and TH in the midbrain tissue were significantly higher(P<0.01),and the levels of DA,NE,and 5-HT in plasma,colon and midbrain tissue were significantly higher(P<0.01).After the intervention,the minimum volume threshold of AWR was significantly higher(P<0.01),the loose stool rate was significantly lower(P<0.01),the miRNA-133b expression was significantly increased(P<0.01 or P<0.05)and the expression levels of Pitx3 and TH were significantly decreased(P<0.01)in the midbrain tissue,the levels of DA,NE,and 5-HT in plasma,colon,and midbrain tissue were significantly reduced(P<0.01)in the moxibustion and Western medicine groups compared with the model group;the levels of 5-HT in the colon and midbrain tissue of the moxibustion group were significantly lower than those in the Western medicine group(P<0.05),and there was no statistical difference compared with the remaining groups(P>0.05).Linear correlation analysis showed that miRNA-133b was negatively correlated with Pitx3(r<0,P<0.01);Pitx3 with TH,TH with DA,and NE with 5-HT were positively correlated(r>0,P<0.01).Conclusion:Moxibustion at Tianshu(ST25)and Shangjuxu(ST37)improves diarrhea symptoms and visceral hypersensitivity in IBS-D rats.The mechanism may be related to up-regulating miRNA-133b,inhibiting Pitx3/TH,and reducing neurotransmitter expression levels in the midbrain tissue. 展开更多
关键词 Moxibustion Therapy Mild Moxibustion Irritable Bowel Syndrome DIARRHEA MicroRNA-133b Pituitary Homeobox Family Factor 3 Tyrosine Hydroxylase NEUROTRANSMITTER
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