Papers by Keyword: Overview

Abstract: The centrifuge model test could achieve the stress state equal to that of the prototype in the ultra-acceleration field formed by the centrifuge machine. Then the similitude theory could be used to obtain the displacement of the prototype and development process of plastic zone, acquiring the mechanism of instability and failure of the full-scale prototype. Based on the review of a large number of literatures and materials on centrifuge technologies. This paper introduced an overview of the development history of centrifuge equipments, techniques and data acquisition, some ignore factors have been pointed out, as well as some key problems which need to be further researched.

Abstract: This paper introduces the system structure of neural network in fault diagnosis, and summarizes some applications of neural network in fault diagnosis. The most commonly used neural network in fault diagnosis is BP network. The second is RBF network and the third is ART. For each neural network, the paper will discuss the neural network, and the introduce some applications. It also introduces the combination of neural networks and other techniques. In the last part, this paper points out the development trend of the neural network in fault diagnosis.

Abstract: Wind loads on buildings are evaluated by using codes and standards. They are based on wind tunnel tests, which are performed on an isolated model in open exposure. Measurements by several researchers have shown that wind loads on real objects are considerably different than those on an isolated building. Structures around building decrease or increase the forces on building. This effect is termed interference. Interference includes geometry, layout and orientation of surrounding objects. Further aspects are direction of the wind and terrain conditions. For this reason it is necessary to evaluate interference before planning. The aim of the article is to overview the recent research, comparison between an isolated building and a group of buildings, to name the interference parameters and explain how they modify the forces on building. Also attempt to provide general recommendations for elementary models because this problem has large number of variations, especially for complicated models where it is necessary to evaluate the specific type of building. These recommendations should be used by designers and planners of the buildings.

Abstract: As one of the important quality indicators of organic heat carrier, the determination method of Viscosity Parameter has been greatly developed in recent years. In this paper, the traditional and new measurement methods have been summarized and introduced. Then it analyzed the current status and the existing problems of the measurement methods of Viscosity Parameter in our country, and it also prospected the development of the measurement methods of Viscosity Parameter of organic heat carrier. The new measurement method in recent years can be expected to viscosity measurement methods in the field of organic heat carrier along the following direction of development: (1)The traditional measurement methods will be further development and application; (2)The optical measurement techniques will be the most promising method for real-time measurement of viscosity in the organic heat carrier; (3) By using the method of modern data acquisition and processing to improve the traditional organic heat carrier viscosity measurement technology.

Abstract: The article mainly argues with the latest progress of methodologies which is the introduction of a difluoromethylene unit into the organic compounds. It will also summarize the theoretical study of introducing gem-difluoromethylene group into the organic molecular. Firstly, it briefly reviews the function of difluoromethylation reaction; secondly, we start to study the recent development of introducing a CF₂ group in the organic synthesis. At last but not the least, we conclude the use of the new CF₂ unit in the syntheis of the molecular.

Abstract: Wireless sensor network is one of the three emerging technologies which have changed peoples life in the 21st century. More and more scholars at home and abroad are interested in wireless sensor network because of its vast potentials for future development. However, because of openness of the wireless sensor network, it is easily attacked by several network aspects. This paper will introduce the basic concept of wireless sensor network first and then present potential safety hazards on each protocol stack layer of the wireless sensor network from the perspective of layered network. An overview of the current popular means of defense on each protocol stack layer will also be summarized and the future research trend of attack and defense means of the wireless sensor network will be put forward finally in this paper.

Abstract: This paper presents a thorough review of optical voltage sensors (OVS) based on Pockels effect which contain many design schemes over the last decades. The principle and optical circuit of each scheme are described respectively, such as Integrated-optic Pockels cell, multi-segment OVS, quasi-reciprocal reflective OVS, dual-crystal OVS and OVS with special optical fiber. The main strengths and weaknesses in every scheme are analyzed. Finally, we summarized the remaining problems in OVS and the future research direction as well to improve the performance of OVS based on Pockels effect.

Abstract: Tourism industry has been put within potentially fragile environment such as coral reefs, mangroves, and polar areas, and has become one of the major factors shaping landscape and sea in coastal zones. In order to improve the sustainable development of coastal tourism, there is a need to focus on the negative effect of tourism on environment in coastal zone. The aim of this paper is to examine this prior researches related to this topic. The study revealed that the environmental impacts caused by tourism can be seemed as a complex system including diverse internal and external interacted factors, and the relationships between coastal tourism and environment adapts over time in different stages of coastal destination development.

Abstract: The traditional Behavior Selection Mechanism (BSM) has two problems: it can’t be achieved autonomously under uncertainty conditions; its selection is absence of diversity under the same conditions. Being inspirited by the research achievements in emotion mechanism application to affective calculation and reinforcement learning, emotion is applied to BSM research to settle its problems. An emotion-affected mechanism is suggested. It is design-based totally; there are not the corresponding academic supports on it. Therefore, there exist three problems: the necessary elements, which it should have had, have not involved in; its architectures and emotion models are different; in addition, systematic analysis and comparisons have not been conducted among them. The suggestions are offered that the emotion-affected behavior selection mechanism should start off with mining the internal consistency among relevant research results of emotion in microeconomics, psychology, ethology, etc. Meanwhile, comparative research method will be meaningful.