Synthesis of Zinc Tetraaminophthalocyanine Functionalized Graphene Nanosheets as an Enhanced Material for Sensitive Electrochemical Determination of Uric Acid

A new electrochemical sensor material has been fabricated via the non‐covalent functionalization of reduced graphene oxide (rGO) and soluble tetramino zincphthalocyanines (ZnPc‐NH₂). Immobilization of uricase onto the synthesized nanohybrids can evidently improve the electrocatalytic activity and selectivity. The obtained composite membrane possesses a great enhancement of electron transfer rate and excellent synergistic electrocatalytic effect toward uric acid (UA) oxidation under the working potential at 0.620 V vs. Ag/AgCl with a scan rate of 0.125 V/s. The effects of the experimental parameters on the electrochemical oxidation responses of UA were investigated and optimized in detail. Under the optimized conditions, the peak currents were proportional to the UA concentration in a range from 0.5 to 100 μmol/L with detection limit of 0.15 μmol/L. Moreover, the developed sensor was applied for UA determination in human urine samples with high accuracy and satisfactory recovery, which is envisioned to have promising applications in monitoring UA in clinical research.     

石油沥青质在烃中的稳定性研究

石油是以沥青质为分散相的非水胶体体系[1,2 ] 。研究认为 ,石油中沥青质的沉淀和絮凝 ,对石油开采及输送有十分重要的影响 [3]。提高沥青质在石油中的胶体稳定性 ,可强化石油加工过程中的重油减压蒸馏、催化裂化、减粘裂化及延迟焦化等过程[1,2 ] ,是提高炼厂轻质油收率、改善产品质量、提高综合经济效益的重要途径。国外关于沥青质在烃类介质中的稳定性研究报道较多 ,大多侧重于胶质对沥青质的稳定作用。由于胶质和沥青质均为由多种复杂结构分子组成的混和物 ,探讨胶质对沥青质的稳定机理极端困难 ,Chia-Lu Chang[4 ]等定量讨论了沥青质…     

安徽曜主信息网的发展

简要介绍了电信网面临的新形势。较全面地阐述了安徽省电信信息网的现状、不同的 IP传送技术和安徽电信信息网的发展思路以及宽带网的建设情况。     

成年人房室结及房室束的透射电镜观察

目的：了解成人房室结、房室不的超微结构。方法：用透射电镜观察２例男青房室结本部及房室束分叉部。结果：（１）Ｐ细胞少且散在，肌丝束短而少、无肌节形成，走向不规则；细胞器主为线粒体；（２）移行细胞约占９５％，细胞呈长带形，有分叉，互相交织成网；其线粒体丰富，常成堆分布；肌节长短不一；两细胞间有类属于缝隙连接；（３）房室结构的毛细血管和间质数量不及窦房结多；（４）房室束细胞不一；两细胞间有类属于缝隙连接     

三腔谐振腔渡越时间效应的小信号分析

 以小信号条件下入射相位为φ0的单个电子在驻波电场中的运动为基础,研究了电子束在三腔谐振腔π模驻波场中的渡越时间效应,导出了三腔谐振腔的电子负载电导的表达式,讨论了三腔谐振腔中束波能量交换情况。     

9MeV电子直线加速器X射线测量

高能工业CT采用9MeV电子加速器产生轫致辐射,利用高能X射线能够有效地穿透物质以及同物质对射线吸收和散射不同这一原理来检查物体内部缺陷或内部结构。加速器电子束的焦点、X射线的最高能量、X射线剂量及均匀性与工业CT成像的质量和速度密切相关;对探测器的电子线路部分进行的X射线屏蔽关系到探测器的使用寿命。X射线测量结果表明,所用9MeV电子直线加速器满足高能工业CT检测的要求。     

Fouling during constant flux crossflow microfiltration of pretreated whey. Influence of transmembrane pressure gradient

Pretreatment of whey by microfiltration (MF) has emerged as a necessary step in producing high purity whey protein concentrates. In the MF of pretreated whey using a Carbosep M14 membrane (pore diameter 0.14 μm), proteins and calcium phosphate aggregates were responsible for fouling, which increased according to the “complete blocking” filtration law and accounted for a progressive decrease of the active filtering area. An operating mode with dynamic counter pressure (recirculation of the permeate co-current to the retentate), as opposed to static counter pressure, allowed lower overall fouling, a longer time of operation and better protein recovery because of more evenly distributed fouling along the membrane tube. At shorter times of operation, fouling was greater under higher transmembrane pressure (TP), so that the less fouled areas under lower TP were forced to filter larger volumes and consequently became fouled more rapidly. This involved a movement of the effective filtering area along the membrane tube, as evidenced by the systematic evolution of fouling heterogeneity as measured by infra-red spectroscopy.     

多种自愈环容量的比较和配置算法研究

就不同的业务需求下如何经济地设计自愈环容量进行详细探讨，其中路由配置算法是自愈环的容量设计的关键。由此，先分析了特殊业务模型下的各种自愈环容量，然后提出两种实际应用中的双向环路由配置算法－－分割法和不分割法，将它们与过去文献中所提出的平衡法（Balance Algorithm)和指派法（Demand Routing ALgorithm)进行比较，并给出模拟试验的结果，显示了这两种配置算法在充分利用SHR带宽上的优越性。     

漫论毕业设计教案策划

针对当今高等学校理工类专业毕业设计的教案构建与策划，提出了关于把毕业设计时间进程安排成三个学期(毕业设计传统的时间安排一般为一个学期)的改革思想。并提出了关于毕业设计指导方法中的五个典型指导重点，四环节指导流程和多种多样指导形式的具体实施举措与办法。同时，依据我们多年来指导毕业设计的实践体验，结合我校电气工程及其自动化专业毕业设计改革与创新的实施情况，进行了总结研究。     

一种用于拉曼光谱研究的毛细管/双光纤传感器

:本文提出了一种用于拉曼光谱研究的新型毛细管/双光纤传感器,对传感器构型和特性进行了研究,并将其用于四氯化碳样品的研究。结果表明,毛细管传感器的信噪比和灵敏度较普通方法有较大提高