Preparation and Blood Compatibility of Oxidized-chitosan Films

Chitosan membrane was modified by the selective oxidization of chitosan molecules on its surface with NO2 gas. FTIR spectra indicated there were plenty of -COOH and -COO groups on the modified membrane surface. The SEM study showed the modified membrane surface was rough rather than smooth as chitosan membrane. All antithrombosis test, hemolysis test and blood cell morphology observation with SEM revealed that modified chitosan membranes have superior blood compatibility to chitosan.     

Solvothermal synthesis of hollow Eu2O3 microspheres using carbon template-assisted method

This work presents a sol-gel carbon sphere template-assisted method of hollow Eu₂O₃ microspheres preparation. X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), as well as photoluminescence (PL) were used to characterise the products. The formation of hollow structure Eu₂O₃ microspheres can be assigned to a sol-gel carbon template. Furthermore, this work may confirm that the precursor sol-gel can be loaded onto the inner as well as the outer surface of carbon templates similarly as ions and nanocrystals. The presented method can afford a simple and efficient technique to obtain a series of hollow structure inorganic materials with high productivity.     

Study on Chemiluminescence Reactions of Lucigenin and Reductants by Flow Injection Analysis

Preceding studies involved two kinds of chemiluminescence (CL) reactions of Lucigenin(Lu ),one was the reaction of Lu with H=O, catalyzed by metal ions, the other was that ofLu with organic reductants such as glucose, uric acid and so on.We found that Mo (Ill),V (11 ),U (ill),W (ill),Cr (11 ),Ti (ill) and Fe (11 ), whichwere produced on-line by passing Mo (VI),V (V ),U (VI), W (VI), Cr (VI,lll),Ti (N) andFe (ill) through a micro Jones column', can react with Lu to generate strong …     

Transient energy density distribution of a rod under high-frequency excitation

Energy finite element analysis (EFEA) is an efficient way to solve high-frequency structural dynamics response problems. Up to now, EFEA has been used to deal with time-independent vibration problems. However, it is still necessary to understand the time dependent details of energy density distribution of a structure. To study the transient response of a rod under high-frequency sinusoidal excitation, the transient energy density governing equation for a rod is presented. The governing equation is solved, and the solution is verified using an analytical method. Example application to a rod is presented to illustrate the feasibility.     

用于超级电容器的锰钴氧化物/碳纤维材料

The development of high-performance supercapacitor electrode materials is imperative to alleviate the ongoing energy crisis. Numerous transition metals (oxides) have been studied as electrode materials for supercapacitors owing to their low cost, environmental-friendliness, and excellent electrochemical performance. Among the developed binary transition metal oxides, manganese cobalt oxides typically show high theoretical capacitance and stable electrochemical performance, and are widely used in the electrode materials of supercapacitors. However, the poor conductivity and active material utilization of manganese cobalt oxide-based electrode materials limit their potential capacitance application. Cotton is mainly composed of organic carbon-containing materials, which can be transformed to carbon fibers after calcination. The resultant carbonaceous material exhibits a large specific surface area and good conductivity. Such advantages could potentially suppress the negative effects caused by the poor conductivity and small specific surface area of manganese cobalt oxides, thereby improving the electrochemical performance. Herein, we firstly deposited manganese cobalt oxides on cotton by a simple hydrothermal method, yielding a composite of manganese cobalt oxides and carbon fibers via subsequent calcination, to improve the electrochemical performance of the electrode material. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA), and electrochemical characterizations were used to investigate the physical, chemical, and electrochemical properties of the prepared samples. The fabricated manganese cobalt oxides in the composite were uniformly dispersed on the carbon fiber surface, which increased the contact between the interface of the electrode material and electrolyte, and enhanced electrode material utilization. The electrode material was confirmed to have well contacted with the electrolyte during a contact angle test. Hence, a pseudo-capacitance reaction completely occurred on the manganese cobalt oxide material. Moreover, the addition of carbon fibers reduced the resistance of the material, resulting in excellent capacitive performance. The capacitance of the prepared composite was 854 F∙g^-1 at a current density of 2 A∙g^-1. The capacitance was maintained at 72.3% after 2000 cycles at a current density of 2 A∙g^-1. These results indicate that the manganese cobalt oxide and carbon fiber composite is a promising electrode material for high-performance supercapacitors. The findings presented herein provide a strategy for coupling with carbon materials to enhance the performance of supercapacitor electrode materials based on manganese cobalt oxides. Thus, novel insights into the design of high-performance supercapacitors for energy management are provided.     

Remark on stability of rarefaction waves to the one‐dimensional compressible Navier–Stokes equations with density‐dependent viscosity coefficient

In this paper, we study one‐dimensional compressible isentropic Navier–Stokes equations with density‐dependent viscosity. We can obtain the asymptotic stability of rarefaction waves for the compressible isentropic Navier–Stokes equations when the power of viscosity coefficient , which enlarge the range of α in the article [Jiu Q, Wang Y, Xin ZP, Communication in Partial Differential Equations 2011; 36: 602‐634]. Copyright © 2013 John Wiley & Sons, Ltd.     

Three Unusual New Sesquiterpenes from Alpinia oxyphylla

Two new norcadinene sesquiterpenes oxyphyllones C and D ( 1 and 2 , resp.), and one new 1,10‐secoguaiane sesquiterpene, (+)‐mandassidion ( 3 ), together with two known compounds, oxyphyllenodiol B ( 4 ) and (1R,2R)‐p‐menth‐3‐ene‐1,2‐diol ( 5 ), were isolated from the fruits of Alpinia oxyphylla. Their structures were determined on the basis of spectroscopic analysis, including 2D‐NMR spectroscopic techniques. Compounds 1, 2 , and 3 exhibited no cytotoxicity against three cancer cell lines.     

电离辐射技术在甲壳素/壳聚糖改性中的应用

电离辐射技术作为一种材料改性的重要手段在天然高分子甲壳素／壳聚糖的开发研究方向有许多独特的优点,本文在甲壳素／壳聚糖的辐射加工及辐射改性的甲壳素／壳聚糖的应用两方面综述了该领域的最新进展。     

棱镜夹具设计

阐述了夹具设计的意义和加工方法的选择原则。介绍了夹具上盘的加工方法和对夹具设计的要求 ,并通过对半五角棱镜和斯米特屋脊棱镜的夹具设计实例 ,讨论了一般夹具的设计思想、依据和步聚     

N-(O,S-二甲基硫代磷酰基)α-L-氨基酸酯的合成及其杀虫活性

从α-L-氨基酸酯在摩尔级高产率制备了光学纯N-(O,S-二甲基硫代磷酰基)α-L-氨基酸酯. 利用IR,1H-NMR,摩尔旋光鉴定了结构特征,利用生物测试法研究了杀虫活性.4 种活性氨基酸杀虫剂在0.01% ～0.001% 浓度内,它们对两令棉铃虫的触杀死亡率为100% ～80% ,胃杀死亡率为95% ～50% ,而且杀虫活性有随活性氨基酸杀虫剂分子中R-基团碳链增长而增强的趋势.