Effect of bromization on the properties of a series of sub-stituted 1,8,15,22-tetra(2,4-ditertbutylphenoxy) phthalocyanines

As a novel kind of functional dyes, phthalocyanines and metallophthalocyanines have been attracting the at-tention of many scientists for many years. Recently, the chemistry of Pcs has been undergoing a renaissance because Pcs and many of their derivatives exhibit theirproperties for potential application in materials science[1,2 One of the main questions in the field of phthalocya-nines research is to modify the molecular structure re-placing the benzene-spherical hydrogen atoms by various s…     

Information for Authors

The Journal of Zhejiang University SCIENCE is edited by an international board of distinguished Chinese and foreign scientists, and is aimed to present the latest developments and achievements in scientific research in China and overseas to the world‘s scientific circles, especially to stimulate and promote academic exchange between Chinese scientists and between them and their foreign counterparts everywhere.     

The Ray Wu Society for Life Sciences

The Ray Wu Society for Life Sciences (RWS) is anon-profit professional society of Chinese-American andChinese life scientists with the goal to promote scientific communication among the scientists between USA andChina and the life science research in China. The mem-bers of the RWS, now numbered more than 300, are agroup of elite biologists who have reached the level ofassistant professor or equivalent in their careers and areexperts of their respective fields including molecular bi-olog…     

Structure and collaboration relationship analysis in a scientific collaboration network

We construct a weighted network of scientific collaboration in computational geometry and study the statistical properties of the network. In addition, we introduce a parameter called the collaboration relationship parameter to measure the collaboration between scientists. The collaboration relationship parameter of two scientists depends not only on the connection weights between the nodes, but also on the network’s structure. The stability of the network’s structure in terms of different edge removal strategies is also studied. According to the parameter, we find that a community structure exists in this type of network.     

Graphene-based hybrid materials and their applications in energy storage and conversion

Graphene attracts more and more scientists and researchers owing to its superior electronic,thermal,and mechanical properties.For material scientists,graphene is a kind of versatile building blocks,and considerable progress has been made in recent years.Graphene-based hybrid materials have been prepared by incorporating inorganic species and/or cross-linking of organic species through covalent and/or noncovalent interactions.The graphene-based hybrid materials show improved or excellent performance in various fields.In this review,we summarize the synthesis of graphene and graphene-based hybrid materials,and their applications in energy storage and conversion.     

Liquid fragility——A key togoing deep into materials of glassy states

“Liquid fragility“ is a concept that has been widely used in the investigation on the glass community,though it was presented less than two decades ago. The concept enables the comparison between the glass-forming liquids with different dynamic characters by using a general criterion, in which the temperature scale is reduced by the glass transition temperature. In order to illuminate the significance of the concept in the fields of the glass transition,structural relaxation process and the structure of supercooled liquids, the accomplished progress and the faced challenges are summarized from different aspects such as on the correlation between dynamics and thermodynamic characters of condensed matters, on the energy landscape, on the nonexponential relaxation and on the theoretical model of microstructure and medium-range order. The tendency of investigation in “liquid fragility“ is also evaluated.     

JZUS opens this new column＂Science Letters＂

Since Jan. 2004, JZUS has launched this new column “Science Letters“ and we welcome scientists all over the world to publish their latest research notes in less than 3-4 pages.     

Nano-Structured Carbide-Derived Carbon Films and Their Tribology

Carbide-derived carbon （CDC） is a form of carbon produced by reacting metal carbides, such as SiC or TiC, with halogens at temperatures high enough to produce fast kinetics, but too low to permit the rearrangement of the carbon atoms into an equilibrium graphitic structure. The structure of CDC is derivative of the original carbide structure and contains nanoscale porosity and both sp2 and sp3 bonded carbon in a variety of nanoscale structures. CDC can be produced as a thin film on hard carbides to improve their tribological performance. CDC coatings are distinguished by their low friction coefficients and high wear resistance in many important industrial environments and by their resistance to spallation and delamination. The tribology of CDC coatings on SiC surfaces is described in detail.     

Investigation on the Structure of Chute - feed and Card Auto - leveller and Their Selection of Technological Processes

Based on the structure of chute - feed and autoleveHer, an analysis of their working principle and the verification of their practical production results have been carried out. Finally, the future investigation direetiom of chute - feed and card autuleveller are put forward.     

The Relationship between Polarographic Reduction Potentials and Discharge Properties of Disperse Dyes

The half-wave potentials of disperse dyes with different structures are measured, the relationship between half-wave potentials and their discharge properties is discussed, then their effect factors are studied, such as the chemical structure types and substituents of disperse dyes and technological parameters. The results indicate that the halfwave potentials of disperse dyes when reduced could be used to characterize their reducing and discharge properties.     

Lamins and their genes

The nuclear lamina is an important nuclear structure. The studies on its peptides lamins and genes have made substantial progress in recent years. In this paper, the new achievements in studies of new lamin members and their functions, lamin genes and their origin and differentiation, are reviewed and discussed. Some research areas that deserve to be investigated further are put forward.     

Novel Strategies for Preparation and Characterization of Functional Polymer-metal Nanocomposites for Electrochemical Applications

1 Introduction The synthesis and characterization of Metal NanoParticles (MNPs) has attracted great interest of scientists and technologists within the last years due their unique physical and chemical properties,which substantially differ from those of both bulk material and single atoms.These properties provide various practical applications of MNPs including catalysis-and electrocatalysis-based processes,which occur in,for example,fuel cells of different types or in various sensing devices (e.g.amperometric sensors and biosensors).The main drawback,which still limits their wide applications,is insufficient stability of MNPs dealing with their high trend to aggregate.Coalescence of MNPs results in the loss of their nanometric size and special properties.Stabilization of MNPs in polymeric matrices of different types has been proven to be one of the most promising strategies to prevent their aggregation and to save their properties[1].The Polymer-Stabilized MNPs (PSMNPs) and the polymer-metal nanocomposite materials on their base start to find wide applications in various fields of science and technology.     

A Kind of Braided-Lie Structures

We introduce a family of braided Lie algebras.They are Lie algebras in the unifying Yetter Drinfeld Long module categoryJJMQQ where J and Q are Hopf algebras.We study their structure and the braided Lie structure of an algebra A in JJM QQ.     

Preparation of Highly Luminescent Nanocomposite by Chelating Copolymer

1 Introduction Quantum-confined semiconductor nanocrystallite, which diameters are less than their bulk exciton diameter, have been the focus of much investigation recently~([1-4]).Because the difference in crystalline structure and size of semiconductor materials lead to considerable change in the effective masses of electrons and holes in their electronic bands, thus, their size and structure of crystalline of semiconductor nanocrystallinites is an important factor for determining their opti…     

Video Structure Analysis

Video structure analysis is a basic requirement for most content-based video editing and processing systems. This paper presents a fast video structure analysis method based on image segmentation in each frame, with region matching between frames. The structure analysis decomposes the video into several moving objects, including information about their colors, positions, shapes, movements, and lifetimes. The method also supports user interactions to improve the results. The result shows that this method is fast and stable and can complete video analyzinq interactivelv.     

Pd–Ni–P metallic glass nanoparticles for nonenzymatic glucose sensing

Metallic glass nanoparticles hold great promise as nonenzymatic glucose sensors due to their rich low-coordinated active sites and high biocompatibility. However,their non-periodic atomic structure and unclear structure-property relationship pose significant challenges for realizing and optimizing their sensing performance. In this work, Pd–Ni–P metallic glass nanoparticles with variable compositions were successfully prepared as nonenzymatic glucose sensors via a laser-evaporated inertgas conde...     

Advances in identification and application of tumor antigen inducing anti-cancer responses

Tumor antigen is one of the important bases of tumor immunotherapy . With the discovery of novel tumor antigens, interest in specific immunotherapy for treatment of malignancies has increased substantially. Nowadays more and more scientists paid close attention to various tumor antigens with their roles or/and applications in anti-cancer immune responses, immune tolerance, tumor markers,     

Implementation Methods of Computer Aided Design-Drawing and Drawing Management for Plate Cutting-Machine

The implementation methods of computer aided design, drawing and drawing management for plate cutting-machine are discussed. The system structure for plate cutting-machine design is put forward firstly, then some key technologies and their implementation methods are introduced, which include the structure management of graphics, the unification of graph and design calculation, information share of part, assemble and drawing management system, and movement simulation of key components.     

Three-dimensional recon- struction and analysis of structure characteristics on senile plaques of Alzheimer’s disease

Alzheimer‘s disease is a progressive neurodegenerative disorder characterized by the presence of senile plaques primarily composed of amyloid β in brain. Abnor-mal secretion and aggregation of amyloid β are the key events in pathogenesis of Alzheimer‘s disease. Reduction of amyloid β production and inhibition of amyloid β aggregation to form senile plaques are hopeful strategies for the treatment and prevention of Alzheimer‘s disease. In the present study, the silver and immunohistochemical staining methods were applied to discover senile plaques in the hippocampus of Alzheimer‘s disease patients, and then images were processed and three-dimensionally reconstructed by Matlab and AVS software. The structure characteristics of senile plaques were measured through correlation function calculation and fractal dimension by a computer-aided method. Diffuse plaque had no amyloid center, but classic plaque presented compact central core structure; two types of plaques were both of porous structure, but the sizes of their pores were significantly different. Furthermore, there was difference in fractal dimension value between the diffuse plaque and classic plaque in the two staining methods. The comparison of structure characteristics between two types of plaques indicated that they developed independently. Establishment of the methods for reconstructing the three-dimensional structure of senile plaque and analyzing their structure characteristics is helpful for further study on the aggregation mechanism of senile plaque.     

Thermoelectric properties of porous (Bi0.15Sb0.85)2Te3 thermoelectric materials

In order to obtain thermoelectric materials with high figure of merit, the concept of Hollow (Vacuum) Quantum Structure or Effect and related thermoelectric materials design were proposed. To demonstrate the theory, the materials of (Bi_0.15Sb_0.85)₂Te₃ with porous structure have been fabricated. Their thermoelectric properties and the microstructure were investigated and compared with their density structure. It was found that the porous structure could improve their properties greatly.