日本泡沫经济分析及其对中国的启示

阐述了泡沫经济的概念及其成因,分析了日本泡沫经济形成的国际背景、产生的内部因素、主要表现形式以及泡沫破灭对日本的负面影响,探讨了日本泡沫经济对我国的启示.     

4G移动通信关键技术与面临的问题

本文主要对4G移动通信的关键技术进行了简要的论述,分析了4G的网络结构和4G的关键技术,在此基础上详细讨论了目前全球以及我国的4G技术进展及面临的问题,最后对4G的前景进行了预测.     

森林旅游景区公路建设中的环保问题研究

在介绍森林旅游景区公路建设与环境保护技术的研究现状的基础上，对景区公路建设的特点及其基本要求进行了归纳，分析了景区公路建设对环境可能造成的破坏影响，结合公路建设中选线、水土流失防治等方面的问题提出了森林旅游景区公路建设中环境保护技术措施，为森林旅游景区的公路建设与环境保护这两方面的协调发展提供了一些参考依据。     

中国出口企业现状分析

阐述了我国出口企业的现状,从国际、国内两个方面分析了造成出口企业现状的原因,并提出了相应的对策.     

论英汉思维模式差异与英语写作教学

由于英汉思维方式的不同，英汉语各自形成了自己独特的写作特点。本文从分析英汉思维方式的差异出发，对英汉写作的主要差异进行研究，并对英语写作教学提出一些意见和建议。     

Editor’s note

The coastal zone spans both land and water, extending landward up to the highest water line that occurs on shore during storms and seaward to the point at which storm waves no longer move sediments on the seafloor. The specific contact line between land and sea is the shoreline and adjacent land is considered     

Medical entity and attributes extraction system based on relation annotation

The abundant entities and entity-attribute relations in medical websites are important data resources for medical research. However, the medical websites are usually characterized of storing entity and attribute values in different pages. To extract those data records efficiently, we propose an automatic extraction system which is related to entity and attribute relations (attributes and values) of separate storage. Our system includes following modules: (1) rich-information interactive annotation page rendering; (2) separate storage attribute relations annotating; (3) annotated relations for pattern generating and data records extracting. This paper presents the relations about the attributes which are stored in many pages by effective annotation, then generates rules for data records extraction. The experiments show that the system can not only complete attribute relations of separate storage extraction, but also be compatible with regular relation extraction, while maintaining high accuracy.     

Syntheses,structure and photoluminescent properties of lanthanide oxalatosulfocarboxylate coordination polymers

Hydrothermal reactions of oxalic acid(H2ox) and 2-sulfobenzoic acid(H2L) with lanthanide oxide or hydroxide yielded five lanthanide oxalatosulfocarboxylates.They have a general formula [Ln2L2(ox)(H2O)6]n[Ln = La(1),Nd(2),Eu(3),Gd(4),Tb(5)].Their structures were characterized by single crystal X-ray diffraction,powder X-ray diffraction(PXRD),infrared(IR) spectroscopy,elemental analysis(EA),and thermogravimetric analysis(TGA).1-5 are isostructural coordination polymers and feature one-dimensional(1D) chains,which are extended into 3D supramolecular frameworks through inter-chain hydrogen bonds between coordinated H2O donors and oxygen acceptors from carboxylate,sulfonate and oxalate groups.In addition,the solid-state photoluminescence properties of the Nd(2),Eu(3) and Tb(5) derivatives have been measured at room temperature.The Eu and Tb-containing coordination polymers(CPs) exhibit intense red and green luminescence emissions,respectively,with lifetimes in the order of millisecond.     

Electrodeposition and characterization of thermoelectric Bi<Subscript>2</Subscript>Se<Subscript>3</Subscript> thin films

Bi₂Se₃ thin films were electrochemically deposited on Ti and indium tin oxide-coated glass substrates, respectively, at room temperature, using Bi(NO₃)₃·5H₂O and SeO₂ as starting materials in diluted HNO₃ solution. A conventional three-electrode cell was used with a platinum sheet as a counter electrode, and a saturated calomel electrode was used as a reference electrode. The films were annealed in argon atmosphere. The influence of cold isostatic pressing before annealing on the microstructure and thermoelectric properties of the films was investigated. X-ray diffraction analysis indicates that the film grown on the indium tin oxide-coated glass substrate is pure rhombohedral Bi₂Se₃, and the film grown on the Ti substrate consists of both rhombohedral and orthorhombic Bi₂Se₃.     

Study of two-section composite chain of beads under vertical vibration

We investigated the dynamic properties of a two-section composite chain of beads under vertical vibration.By analyzing the chain’s motion,including phase-shift,mean dilation,center-of-mass displacement,and energy,we found that with different bead arrangements,the chain behaved in different ways.We believe that interaction existing at the interface between bead sections provides the underlying cause.This interaction causes different energy in different arrangements,which leads to different dynamic characteristics.