锂同位素在气溶胶特性示踪研究中的应用     

杨通在  王丽雄  姜涛  龙开明  刘雪梅  杨天丽 《中国科学院研究生院学报》2007,24(5):597-600

以热表面电离质谱计为分析手段，采用6Li稳定同位素示踪了爆炸过程中放射性气溶胶粒子悬浮、沉积和在毛细管中扩散行为。实验结果表明：爆炸后100h，气溶胶粒子悬浮份额占10-5；沉积量占绝大多数，且各部位沉积量存在明显差异；即使在无压力推动下，仍明显观察到了气溶胶粒子在毛细管中的扩散，对于d25μm×2cm 毛细管通道而言，穿透率为1.5×10-10 / h。研究结果对于正确评估放射性气溶胶粒子在爆炸过程中的行为有一定的价值。  相似文献   

Tumor Necrosis Factor-Α, Interleukin-6, C-Reactive Protein Levels and Insulin Resistance Associated with Type 2 Diabetes in Abdominal Obesity Women     

Surapon Tangvarasittichai  Suthap Pongthaisong  Orathai Tangvarasittichai 《Indian journal of clinical biochemistry : IJCB》2016,31(1):68-74

We aim to investigate the association between elevated tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) and high sensitivity-C-reactive protein (hs-CRP) with type 2 diabetes mellitus (T2DM) in abdominal obesity (AO) women subjects. A total of 428 AO subjects (age 48.4 ± 10.2 years), and 107 non-AO women subjects (age 48.8 ± 11.8 years) were enrolled for the all biochemistry testing, inflammatory cytokines, fasting insulin and Homeostasis Model Assessment of insulin resistance (HOMA-IR). Body mass index, waist circumference (WC), blood pressure (BP), plasma glucose (Glu), triglyceride (TG), insulin, HOMA-IR and inflammatory cytokines were significantly higher and lower total antioxidant capacity, HDL-C in AO subjects (p < 0.05). WC was significantly correlated with BP, Glu, TG, LDL-C, insulin, HOMA-IR, TNF-α, IL-6 and negative correlation with HDL-C in AO subjects. Elevation of TNF-α, IL-6, hs-CRP and insulin resistance were significantly associated with T2DM in AO subjects, after adjusting with insulin resistance, increased oxidative stress, elevated TG and reduced HDL-C by using multiple logistic regression analysis. In conclusions, elevation of inflammatory cytokines, oxidative stress and insulin resistance were associated with T2DM in AO women subjects. These inflammatory cytokines are positively associated with T2DM and may have a causal relation with an increased oxidative stress and insulin resistance in these AO women subjects.  相似文献   

聚2.6—萘二甲酸乙二酯的结晶行为     

安宝珠  关家玉  徐懋 《中国科学院研究生院学报》1991,(1)

用光学解偏振法测定了2.6—PEN的结晶速度的温度依赖性,得出其快结晶速度区域是在180℃至230℃之间,而在低于180℃或高于230℃的温度区域,结晶速度都是慢的。测定了不同结晶度试样的动态力学—温度谱,用以研究其结晶行为,得出α损耗峰随结晶度的变化。此外,将上述各实验结果与同法测定的PET的结果进行了对比,发现2.6～PEN与PET的结晶行为的相似性。  相似文献   

Carbohydrate Deficient Transferrin and Interleukin-6 as Predictors of Fibrosis in Alcohol Cirrhosis     

Hanumanthappa Nandeesha  Medha Rajappa  Tamilarasu Kadhiravan  Krishnamoorthy Srilatha  Kottyen Thazhath Harichandrakumar  Durgadevi Thyagarajan 《Indian journal of clinical biochemistry : IJCB》2016,31(1):117-120

The severity of alcoholic cirrhosis depends on the presence of liver inflammation and fibrogenesis. Previous studies have hypothesized that carbohydrate deficient transferrin can be used as marker of liver impairment in alcoholic liver disease patients. The present study was designed to assess whether carbohydrate deficient transferrin is associated with procollagen III peptide and predict fibrosis in alcohol cirrhosis patients. We enrolled 48 patients with alcoholic cirrhosis and 38 healthy controls. Serum carbohydrate deficient transferrin, procollagen III peptide and interleukin-6 levels were estimated in both groups. Serum carbohydrate deficient transferrin, procollagen III peptide and interleukin-6 were significantly increased in alcoholic cirrhosis patients compared to controls. Stepwise regression analysis showed that carbohydrate deficient transferrin (adjusted R² = 0.313, β = 0.362, p = 0.003) and interleukin-6 (adjusted R² = 0.194, β = 0.459, p = 0.001) were positively associated with procollagen III peptide when age, duration and amount of alcohol consumption were considered as covariates. We conclude that elevated carbohydrate deficient transferrin and interleukin-6 act as predictors of fibrosis in alcoholic cirrhosis.  相似文献   

面向IPv6的边界网关协议BGP4+探析     

丁雪莲  刘冬梅  任建平 《内蒙古科技与经济》2007,(14)

文章着重概述了BGP协议,并在此基础上探讨了GBGP4+协议与BGP4协议的区别,同时介绍了BGP4+协议的工作原理.  相似文献   

IPv6全球单播地址的分配情况统计     

刘宗琼 《科技广场》2007,(5):239-241

本文介绍了IPv6地址管理与分配策略,详细分析了全球IPv6地址分配情况,并对IPv6应用做了介绍。  相似文献   

IPv6特征分析及过渡策略     

温炎耿  何月梅 《中国科技信息》2006,(15):141-141,123

通过分析IPv6首标得出其主要特征及相对于IPv4的优势，介绍了IPv4向IPv6过渡的三种主要技术。  相似文献   

一种基于IPv6体系的内外网通信安全策略     

吴芳宇  李力  袁新治  黎敏  徐彤阳 《科技广场》2006,(1):106-107

本文针对IPv4体系下内外网络通信安全策略中的NAT技术在IPv6体系中不能适用的问题,提出了一种基于IPv6网络的内外网络通信安全策略,综合利用认证技术和IPv6体系中的扩展报头定义机制,从而保证了内外网络通信的安全性和高效性。  相似文献   

铑催化的1,6-烯炔环异构化反应研究（英文）     

童晓峰  张兆国  张绪穆 《中国科学院研究生院学报》2006,23(3):416-426

对铑催化的1,6-烯炔环异构化反应进行了研究，这类反应具有较广的底物适应范围，在转化过程中，卤素发生了分子内转移。这类反应提供了一条新的立体选择性合成具有α-氯烯基结构的丁内酯、丁内酰胺、四氢呋喃、吡喃以及五元碳环等分子的方法。发展了两种不同的催化剂体系，即阳离子催化剂体系和中性催化剂体系。阳离子催化剂体系仅能催化顺式烯炔底物的环异构化，相反中性催化剂体系不但能催化顺反烯炔底物的环异构化，而且具有更广的底物适应范围。利用各种烯炔异构体，通过合适的控制实验对反应机理进行了研究。提出了涉及π-烯丙基铑中间体的可能机理，并且利用该机理对一些反应现象进行了解释。最后利用Suzuki偶联反应对产物进行了衍生。  相似文献   

下一代互联网协议:IPV6     

刘红芝 《内蒙古科技与经济》2007,(13)

本文指出了下一代互联网协议IPV6 的产生、特征和优势,及从IPV4到IPV6过渡的几种技术,并对IPV6的应用及发展前景进行了分析.  相似文献