运用SPIN对开放授权协议OAuth 2.0的分析与验证

OAuth 2.0协议是一种开放授权协议,主要用于解决用户账号关联与资源共享问题。但是,其弱安全性导致各网络公司海量用户信息泄露,且OAuth 2.0传输数据采用的https通道效率低下,成为黑客攻击对象。提出采用http通道传输OAuth 2.0协议数据,基于Promale语言及Dolev-Yao攻击者模型对OAuth 2.0协议建模,运用SPIN进行模型检测。形式化分析结果表明,采用公钥加密体系对OAuth 2.0协议进行加密不安全。上述建模方法对类似的授权协议形式化分析有重要借鉴意义。     

基于图理论聚类和二值纹理分析技术的彩色文本图像二值化方法

为了有效地对彩色文本图像进行分割，提出了一种复杂背景下彩色图像中文本一背景分离的新方法。该方法首先应用颜色空间降维以及基于图理论的颜色聚类对彩色文本图像进行聚类，并对应于聚类结果获得一系列二值图像，这些二值图像以及它们之间的组合就构成了二值化的待选结果；然后对与游程直方图以及空间-尺寸分布相关的两类纹理特征进行分析，并结合线性判别分析分类器来从待选的二值图像中选取出具有最佳文本背景分离效果的二值图像。实验结果显示，该方法的：二值化效果比现有方法有显著提高，因而能更有效地对具有复杂背景的彩色文本图像进行分割。     

聚酯乳液涂层在棉织物转移印花上的应用

通过相转变乳化法制得聚酯乳液,检测了乳液粒径和机械稳定性。将该聚酯乳液涂层于棉织物,实现了分散染料对棉织物的热升华转移印花。测试了染料的转移率与皂洗前后织物上染料保留率,研究了氰胺树脂、水性氮丙啶高分子和交联剂EH对印花织物水洗牢度的影响。结果表明,聚酯乳液涂层有利于纯棉转移印花;涂层液中添加交联剂EH后,分散染料由纸向织物的平均染料转移率和皂洗前后织物上的平均保留率分别提高9.89%和34.99%。     

冰爽型吸湿排汗抗紫外线针织面料的生产

采用具有降温功能的冰凉乡仁维(ICE COOL)为原料,与棉进行交织生产新型针织面料,并通过功能性整理,使该面料具有吸湿排汗和抗紫外线功能.详述了该面料的编织工艺和染整工艺,并对该面料的降温、吸湿排汗和抗紫外线功能进行了测试,结果表明该面料的各项功能指标均满足设计要求,适合制作夏季户外运动服装.     

薄型抢险救援服内层非织造材料的制备及性能

以涤纶网眼基布、芳纶类纤网、阻燃黏胶纤维水刺布、PTFE微孔膜为基材,制备出2种薄型抢险救援服内层非织造材料,测试并比较2种内层非织造材料的表面形态、热稳定性能,以及拉伸、耐静水压、透湿、透气、隔热等性能,以期为薄型抢险救援服内层非织造材料的开发提供参考。     

Antioxidant capacities and total phenolic contents of 62 fruits

In order to supply new information on the antioxidant function of selected fruits for nutritionists and the general public, antioxidant activities and total phenolic contents of 62 fruits were evaluated using ferric reducing antioxidant power (FRAP) and Trolox equivalent antioxidant capacity (TEAC) assays as well as the Folin–Ciocalteu method, respectively. The correlations between the FRAP value and the TEAC value as well as total phenolic content were also assessed. The results showed that different fruits had diverse antioxidant capacities and the variation was very large, and seven fruits, Chinese date, pomegranate, guava, sweetsop, persimmon, Chinese wampee and plum, possessed the highest antioxidant capacities and total phenolic contents among tested fruits, and could be important dietary sources of natural antioxidants for prevention of diseases caused by oxidative stress.     

Post-traumatic stress disorder and smoking: a systematic review.

We conducted a systematic review of what is known about the relationship between post-traumatic stress disorder (PTSD) and smoking to guide research on underlying mechanisms and to facilitate the development of evidence-based tobacco treatments for this population of smokers. We searched Medline, PsychINFO, and the Cochrane Central Register of Controlled Trials and identified 45 studies for review that presented primary data on PTSD and smoking. Smoking rates were high among clinical samples with PTSD (40%-86%) as well as nonclinical populations with PTSD (34%-61%). Most studies showed a positive relationship between PTSD and smoking and nicotine dependence, with odds ratios ranging between 2.04 and 4.52. Findings also suggest that PTSD, rather than trauma exposure itself, is more influential for increasing risk of smoking. A small but growing literature has examined psychological factors related to smoking initiation and maintenance and the overlapping neurobiology of PTSD and nicotine dependence. Observational studies indicate that smokers with PTSD have lower quit rates than do smokers without PTSD. Yet a few tobacco cessation treatment trials in smokers with PTSD have achieved quit rates comparable with controlled trials of smokers without mental disorders. In conclusion, the evidence points to a causal relationship between PTSD and smoking that may be bidirectional. Specific PTSD symptoms may contribute to smoking and disrupt cessation attempts. Intervention studies that test behavioral and pharmacological interventions designed specifically for use in patients with PTSD are needed to reduce morbidity and mortality in this population.     

蛋清蛋白、大豆分离蛋白及其美拉德反应产物膜包裹对核桃仁脂质过氧化作用的比较研究

本文通过测定核桃油酸价、过氧化值、丙二醛含量、碘值和DPPH自由基清除率五个指标的变化研究比较蛋清蛋白膜、大豆分离蛋白膜及其与木糖美拉德反应产物膜包裹对核桃仁脂质过氧化的影响。结果表明,随着反应时间(0~8d)的增加,核桃仁酸价、过氧化值和丙二醛含量均呈现上升趋势,DPPH自由基清除率均呈现下降趋势,而碘值则变化不明显。加热第8d时,四种膜包裹核桃仁的酸价、过氧化值和丙二醛含量均小于未包膜的核桃仁,DPPH自由基清除率高于未包膜的核桃仁。四种膜包裹核桃仁的酸价无显著性差异(p0.05);而过氧化值中以蛋清蛋白膜组较高,且其余三组的无显著性差异(p0.05);四种膜包裹核桃仁的丙二醛含量均明显低于未包膜组,延缓丙二醛含量上升的效果依次为:大豆分离蛋白-木糖膜蛋清蛋白-木糖膜大豆分离蛋白膜蛋清蛋白膜;大豆分离蛋白-木糖膜包裹核桃仁保留的DPPH自由基清除率明显高于其它三种膜。综上所述,两种蛋白及其美拉德反应产物膜包裹均可延缓核桃仁脂质过氧化,综合各项指标其效果依次为:大豆分离蛋白-木糖膜蛋清蛋白-木糖膜大豆分离蛋白膜蛋清蛋白膜。     

细菌纤维素膜对木醋杆菌发酵生产广式米醋的影响

以分离自广式米醋生产车间的木醋杆菌RF4(Gluconacetobacter xylinus)为菌种进行表面发酵。研究了发酵过程中细菌纤维素膜对总酸度的影响,纤维素膜内与发酵液中乙醇脱氢酶活性差异,讨论了3种不同接种培养方式对总酸度、黏度及浑浊度的影响。结果表明,纤维素膜完整性对发酵总酸度有重要影响,纤维素膜内乙醇脱氢酶活性是发酵液中的8倍,达2.26×10-2U/g。含木醋杆菌纤维素膜接种并中途取出的接种培养方式总酸度最高,发酵12天后可达4.86 g/100 mL,且黏度及浑浊度都较低。     

鸭卵清溶菌酶的分离纯化及性质

通过硫酸铵的分级沉淀、CM-Sepharose阳离子交换层析、Superdex-200凝胶过滤层析等步骤,从鸭卵清中获得电泳纯的溶菌酶,该酶的比活力达到33687.26U/mg,纯化倍数为109.44,回收率为28.00%。测得该酶分子质量约为14.82kD,对溶壁微球菌的最适反应温度为50℃,最适pH值为7,且在50℃以下及pH5～9有较好的稳定性,同时在最适条件下测得其Km值为0.0864mg/mL。Fe2+、Mg2+、Mn2+等金属离子对该酶有较强的抑制作用,而Zn2+、Cu2+、Co2+对该酶有一定的激活作用。