A novel dynamic trust model for network service

A novel dynamic trust model for network service is proposed. The corresponding relationship of trust evaluation and interval-valued intuitionistic fuzzy numbers are introduced in the computations,compounds,and general operations of experience of trust,neighbor recommendation trust and agency recommendation trust,which are based on trust demand attributes. Meanwhile,the trust attributes’ weight factors are determined by precise function proportion,while time series weight factors are defined by the inverse form of exponential distribution. And the trust service is finally distinguished by the result of general trust scoring function and psychological factors. Simulation results show that the model can effectively build trust relationship between entities and restrain attacks from malicious entities.     

城市森林生态服务功能价值评估研究进展

城市森林是城市生态系统的重要组成部分,城市森林生态系统服务功能价值评估是当前城市林业的研究热点,对城市的可持续发展具有重要的指导意义。回顾了城市森林的概念及其发展历程,详细讨论了城市森林生态系统服务功能的内涵、框架体系及其价值评估研究进展,并比较分析了各项服务功能的不同价值评估方法及相关研究情况,最后提出了城市森林生态系统服务功能价值评估研究的未来方向。     

基于AHP的城市绿地应急避难机能评价

以层次分析法为基础,对城市绿地应急避难场所进行实地考察,选取城市绿地应急避难能力为目标层(Z),场所的规划设计(B1)、基础设施条件(B2)、管理维护(B3)为准则层,并相应选取场地周边环境等18个因子为指标层(C),建立AHP评价模型。采用1～9标度法为各因子打分,求出各因子的相对权重和合成权重;邀请专家为避难场所打分,结合合成权重计算出避难场所的应急避难能力得分并划分等级;未达满分的应急避难场所要求要计算出各个因子的影响力并进行排序,找出薄弱环节加以改进。并以福州市温泉公园为例,计算出其综合应急能力为82.7分,属于A级;通过δ值的计算得出:温泉公园的周边环境、应急避难指挥中心、应急物质储备室、监控系统等方面需要进一步改善。     

沐川天然林与人工水杉林保水功能比较

通过对四川沐川县天然林、人工林（水杉林）枯落物蓄积量调查分析和持水特性的研究结果表明：枯落物蓄积量为天然林＞人工林（25.7 t·hm-2＞ 18.1 t·hm-2）,最大持水量为天然林＞人工林（75.0 t·hm-2 ＞47.0 t·hm-2）,最大持水率为天然林＞人工林,各时段吸水量、吸水速率表现为天然林＞人工林,有效拦蓄量表现为天然林＞人工林（28.6 t·hm-2＞ 17.0 t·hm-2）.总体分析可以看出,天然林落物层保水功能相对要比人工林好.     

泛素结合酶RAD6的结构与功能研究进展

泛素复合体对蛋白的修饰可以改变蛋白定位、活性和稳定性。泛素结合酶E2在其中起关键作用。RAD6是典型的泛素结合酶,在泛素复合体组装、DNA损伤修复、调控基因表达和细胞周期等生理过程中具有重要作用。本文综述了RAD6蛋白的结构、与其互作的泛素蛋白连接酶E3及其功能研究进展,并展望其在作物研究中的应用。     

禾草内生固氮菌的研究现状及应用前景

植物内生固氮菌是一类重要的固氮微生物资源,其潜在的可开发利用价值越来越受重视。本文综述了禾草内生固氮菌的研究动态、种质资源多样性、侵染途径、定殖方式、作用机理及发展前景,以期为内生固氮菌的进一步开发探究提供参考。     

FUNCTIONALITY OF VETERINARY IDENTIFICATION MICROCHIPS FOLLOWING LOW‐ (0.5 TESLA) AND HIGH‐FIELD (3 TESLA) MAGNETIC RESONANCE IMAGING

The ability to read patient identification microchips relies on the use of radiofrequency pulses. Since radiofrequency pulses also form an integral part of the magnetic resonance imaging (MRI) process, the possibility of loss of microchip function during MRI scanning is of concern. Previous clinical trials have shown microchip function to be unaffected by MR imaging using a field strength of 1 Tesla and 1.5. As veterinary MRI scanners range widely in field strength, this study was devised to determine whether exposure to lower or higher field strengths than 1 Tesla would affect the function of different types of microchip. In a phantom study, a total of 300 International Standards Organisation (ISO)‐approved microchips (100 each of three different types: ISO FDX‐B 1.4 × 9 mm, ISO FDX‐B 2.12 × 12 mm, ISO HDX 3.8 × 23 mm) were tested in a low field (0.5) and a high field scanner (3.0 Tesla). A total of 50 microchips of each type were tested in each scanner. The phantom was composed of a fluid‐filled freezer pack onto which a plastic pillow and a cardboard strip with affixed microchips were positioned. Following an MRI scan protocol simulating a head study, all of the microchips were accurately readable. Neither 0.5 nor 3 Tesla imaging affected microchip function in this study.     

Effects of Bacillus subtilis B10 spores on viability and biological functions of murine macrophages

This study was conducted to investigate the effects of Bacillus subtilis B10 spores on the viability and biological functions of murine macrophage. RAW 264.7 cells were stimulated both with and without B. subtilis B10 spores for 12 h. Then cell viability was determined to evaluate the cytotoxic effect of B. subtilis B10 spores to the cells, and the activities of acid phosphatase (ACP) and lactate dehydrogenase (LDH), the production of nitric oxide (NO) and inducible nitric oxide synthase (iNOS), and the secretion of inflammatory cytokines were measured to analyze the functions of macrophages. The results showed that B. subtilis B10 spores were not harmful to RAW 264.7 cells and they also strongly enhanced the activities of ACP and LDH (P < 0.01), remarkably increased NO and iNOS production (P < 0.01), and significantly stimulated the secretion of pro‐inflammatory cytokines, including tumor necrosis factor‐alpha (TNF‐α), interferon‐gamma (IFN‐γ), interleukin‐1 beta (IL‐1β), IL‐6, IL‐8 and IL‐12 (P < 0.01) while they reduced anti‐inflammatory cytokine IL‐10 (P < 0.01). The outcomes suggest that B. subtilis B10 spores are not only safe for murine macrophages, but also can activate these cells and enhance their immune function. The above findings suggest that B. subtilis B10 spores are potentially probiotic.     

酵母铬对围产后期奶牛抗氧化能力的影响

选用20头胎次相近和分娩期相近的中国荷斯坦奶牛,随机分为4组,对照组为基础日粮,3个处理组在基础日粮中分别添加3．0、6．0和9．0g／a的酵母铬。试验期为2周,从分娩当天持续到产后14d。结果表明,（1）与对照组相比,添加酵母铬可以提高血清中总抗氧化能力（T—AOC）,超氧化物歧化酶（SOD）和谷胱苷肽过氧化物酶（GSHPx）的活力（P〈0．01）,降低丙二醛的浓度;（2）酵母铬降低了皮质醇含量,提高了胰岛素活性。本试验条件下,发现基础日粮添加9．0g／d的酵母铬,使铬添加水平为0．8mgCr／kg时,效果较好。为研究在日粮中添加不同水平的酵母铬对围产后期奶牛抗氧化性能的影响提供依据。     

动物多功能通道装置设计制作与应用

针对动物在饲养过程中,对大型猛兽难以达到安全有效控制的特点,研制了一套实用型动物多功能通道装置,将其固定安装在动物笼舍出入口,让动物习惯性出入,必要时关闭两端栅门,调整压缩装置,对动物实施安全有效控制。本装置结构简单,使用方便,安全性好,各零部件由组合螺丝连接,可重复拆卸和安装,对大型猛兽体重测量、检查检疫、疾病诊治、串笼运输具有实用可靠的作用。本装置已获国家实用型发明专利,专利号：CN201220474789．0。