Thermodynamic characterization of two novel spin-crossover complexes

Spin-crossover complexes are of great interest to the scientists because of their potential application in molecular-based electronic devices. Some octahedral metal compounds with 3dn (4 ≤ n ≤ 7) configuration can induce a spin state conversion through a fine tuning condition (temperature, pressure, light irradiation, etc.). If the conversion occurs reversibly with a hystersis loop and color change, it will make the system possessing memory effect. The memory effect can be magnified and the …     

Electronic connection to the interior of a mesoporous insulator with nanowires of crystalline RuO2

Highly porous materials such as mesoporous oxides are of technological interest for catalytic, sensing and remediation applications: the mesopores (of size 2-50 nm) permit ingress by molecules and guests that are physically excluded from microporous materials. Connecting the interior of porous materials with a nanoscale or 'molecular' wire would allow the direct electronic control (and monitoring) of chemical reactions and the creation of nanostructures for high-density electronic materials. The challenge is to create an electronic pathway (that is, a wire) within a mesoporous platform without greatly occluding its free volume and reactive surface area. Here we report the synthesis of an electronically conductive mesoporous composite--by the cryogenic decomposition of RuO4--on the nanoscale network of a partially densified silica aerogel. The composite consists of a three-dimensional web of interconnected (approximately 4-nm in diameter) crystallites of RuO2, supported conformally on the nanoscopic silica network. The resulting monolithic (RuO2//SiO2) composite retains the free volume of the aerogel and exhibits pure electronic conductivity. In addition to acting as a wired mesoporous platform, the RuO2-wired silica aerogel behaves as a porous catalytic electrode for the oxidation of chloride to molecular chlorine.     

控制器与对象同时摄动的鲁棒控制问题:多输入多输出系统

研究了多输入多输出线性时不变系统中控制器与对象同时以加性未建模动态模式摄动的鲁棒控制问题,给出了基于线性矩阵不等式的控制器设计方法,而且把类似的方法用于传统的鲁棒性能问题得出了更好的充分条件。     

基于粗糙集理论的人工神经网络故障诊断系统

在故障诊断神经网络模型的基础上,以粗糙集理论中的信息系统属性值表为主要工具,将复杂的神经网络分层的简并剔除其中不必要的属性,克服了网络规模过于庞大及分类识别速度慢等缺点,取得了减少分类过程中的模式匹配搜索量的良好效果,并给出基于粗糙集理论的分层发掘神经网络模型结构及算法,结果表明该系统对工程应用具有一定的参考价值。     

放归鳄蜥昼间活动时间分配的初步研究

2006年5—9月,采用焦点取样法和全事件观察法对放归鳄蜥的昼间活动时间分配进行了初步研究.结果表明:在放归鳄蜥昼间活动时间分配中,在穴占61.02%±30.56%、静栖占36.72%±19.71%、运动占1.55%±0.96%、摄食占0.12%±0.08%、其他行为占0.59%±0.16%.晴天和阴天条件下放归鳄蜥的在穴、静栖、运动、摄食活动时间存在显著性差异(P﹤0.05);圈养鳄蜥和放归鳄蜥的在穴、静栖、摄食活动存在显著性差异(P﹤0.05);雌、雄及亚成体放归鳄蜥间的在穴、静栖、运动活动存在显著性差异(P﹤0.05).结果也表明,长期人工饲养对鳄蜥的摄食活动产生了较大影响.     

无人值守设备远程无线监测系统设计

阐述了以GSM网络为平台,利用SMS短消息技术实现对无人值守设备的远程无线监测.同时,提出了一种以Internet网络为依托,实现WEB网页数据发布的通信模式.介绍了系统组成、结构设计及其软硬件实现.其设计方法具有一定的通用性和先进性,可广泛应用于各领域的无人监测系统中.     

Experimental investigation of incremental reactivity of di-tert-butyl peroxide

Large quantities of di-tert-butyl peroxide (DTBP) have been emitted into the troposphere due to human activities. Its role in the atmospheric photochemical reaction has not been understood. This study presents the results of the photochemical reactions of DTBP and NOx, which have been simulated in a self-made smog chamber under the temperature of (29±1)℃. Both the wall decays of ozone and NO2 could be neglected, compared to the results in simulative experiments. The effective intensity of UV light used in the experiments was 1.28×10-3 s-1, which was expressed by the rate constant of NO2 photolysis in purified air. The reaction mechanism was proposed according to our results and reports of other researchers. The maximum values of incremental reactivity (IR) in the three simulative ex- periments were 9.53×10-2, 5.23×10-2 and 3.78×10-2, respectively. The incremental reactivity decreased with the increase of initial concentrations of DTBP. The IR value of DTBP obtained in this study was comparable to that of acetylene reported in our previous research.     

中国-东盟架构下西南边疆民族地区职业教育品牌战略思考

在中国—东盟架构下,中国西南边疆民族地区职业教育品牌战略要定位于:为该地区培养大量适应中国—东盟自由贸易区市场需求的优秀国际型职业人才,同时敢于竞争邻国的职业教育服务市场,使该地区的职业教育走上区域性国际品牌战略发展的大道。     

组织学习方式与案例研究

对国际知名的学习型组织深入的案例研究表明,基于组织学习来源和方向的组织学习方式存在着多种形式:实验学习、提升能力、标竿学习、不断改良。有的企业在某一阶段只侧重使用其中的一种学习方式,而有的企业则同时使用多种学习方式。而不同的企业之所以使用的组织学习方式不同,是源于各企业的经营战略、企业文化、资源状况以及企业的特性等因素的差异。