Advanced Materials Research Vols. 129-131

Abstract: New shear and extensional viscosity models based on Fredrickson kinetic equation coupled with Dewitt constitutive equation were established to predict viscosities of polymer melts. The experimental data of 125°C LDPE and LDPE filled with 35% glass beads reported from references were compared with the model predictions. The predictions showed good agreement with the measurements. The models are simple and easy to use. Because they contain no structure parameter, they are capable to describe the viscosities of pure polymer and polymer composites.

Abstract: Size, shape and processing of the inorganic fillers are important for improving properties of nanocomposites. In this paper, a novel nanofiller containing mesoporous silica(MS) and fibrous sepiolite(SE) was prepared by in situ deposition method. EP/MS-SE nanocomposite was obtained by adding MS-SE to epoxy resin(EP) matrix. Morphologies and mechanical properties of the new ternary nanocomposite were investigated. For purpose of comparison, the corresponding binary nanocomposites, i.e., EP modified with either MS or SE, were tested as well. The test results of mechanical properties show that MS improves the strength of EP and SE obviously enhances the toughness of EP, but oM-MS exhibits synergistic effect on toughening and reinforcing of EP at the same time. Dynamic mechanical analysis revealed that the glass transition temperature and storage modulus of the EP/MS-SE nanocomposite was higher than those of pure EP.

Abstract: Various mixtures of different lubricants and preparation methods were investigated in order to find the best lubricant mixture for effervescent tablets. Methods: Lubrication effectiveness in two methods of granulation of standard effervescent formulation was tested by using mixtures of various percents of different lubricants. L- Leucine, Polyethylen glycol 6000 and SLS were used as lubricant. The hardness, disintegration time and abrasion for tablets which produced from each formulation were determined. All formulations were investigated for transparency and tastelessness after their complete disintegration of tablets in 200 ml of water. Results: The results show the best lubrication results were obtained by using a mixture of 2% w/w of L- Leucine and 3% w/w of PEG 6000 by ethanol granulation method.

Abstract: Facing the ends warping of refrigerators door, a refrigerator door is simulated using finite element theory and ANSYS software. The enclosed of finite element model and geometric model are established to conduct computing. The results show that simulated values of end warping are significantly greater than the given value of company technique standard. Several structural design schemes are proposed on the basis of production practice and theory analysis. The only one scheme of design improvement is chosen to compute using ANSYS, the results show the values of warping ends are significantly reduced and can meet the production requirements. The reasonable of finite element analysis is proven effectively through long time production.

Abstract: The irregular surface roughness morphology due to ultrasonic method was used approach for increasing the high surface area of substrate and catalyst. The purpose of this paper is to show the ultrasonic and nickel electroplating methods for NiO automotive catalyst development on FeCrAl substrate. The process began with pretreatment of FeCrAl using SiC and/or Al2O3 solution agitating by ultrasonic and followed with nickel electroplating. The oxidation test was conducted for developing the NiO. The physical morphology structure of the presence NiO on the FeCrAl substrate was analyzed using scanning electron microscope (SEM) in combination with energy dispersive X-ray spectroscopy (EDS). The cross sectional observation show the NiO catalyst completely existed on the FeCrAl. The ultrasonic method increases the irregular surface roughness morphology on FeCrAl substrate that influenced the homogeneous and stability of nickel electroplating and NiO surface area development.

Abstract: Virtual enterprises not only help to improve the competitiveness of enterprises but also increase the risks that enterprises face. This paper studies the methods and indexes for enterprise risk evaluation and steps of virtual enterprise risk identification and adjustment, constructs a local optimization model and global optimization model of virtual enterprise risk based on minimum risk loss and finally gives a risk control framework of virtual enterprise. Virtual enterprise is also called virtual organization or dynamic alliance, etc, and it refers to a dynamic alliance of multiple enterprises taking information network technology as support to integrate their respective core competences and resources for catering for fast-changing market opportunities. Virtual enterprise brings advantages of flexibility and quick reaction, etc, but we can not neglect its risks and losses brought by the risks due to uncertainty of external market environment and its complexity and even these risks and losses will lead to its abortion. Under the circumstances, we need to carry out effective identification and control of virtual enterprise risks to ensure the successful establishment and operation of virtual enterprises.

Abstract: .IT services outsourcing motives aroused the concern of many scholars at home and abroad, the paper-driven and theory-driven decision-making both summed up the IT services outsourcing motives. By comparing a variety of IT service outsourcing motivation theory, this paper argues the perspective of resource-based IT services outsourcing motives greater rationality. On this basis, it puts forward the enterprise of resources and flexible resources of rigid concepts. Alternative resource dependence theory, two kinds of resources, service outsourcing are discussed motivation. Finally, the outsourcing of IT services at different stages of life cycle development strategies.

Abstract: As the internet and related technology matured gradually, it indicates a new era of electronic business. This article is developed with ASP and Access Data Base technology, including the realization of the design of shopping website home page module and design of customer and Merchant function module; the develop and management of website backstage function, including management of registered customers, merchants and administrator user, setting to the management of the viewing, modification and publication of products. Detailed research is also made to the development and design of the Data base. The electronic shopping website built based on ASP.NET is B2C and C2C type electronic business website in combination. The merchant shop keeping module is clear and easy to operate. The customer shopping trading procedure is convenient and easy to understand. These are the trend of the current e-business development. As the information industry develops quickly, internet and related technology gradually matured. These all promote the electronic business development, and acknowledged people of this new industry. E-business is applied to many areas to different extend, bring new opportunity to all countries worldwide. In this article, the electronic business model is mainly targeted on the synthesis of C2C (small scale, small amount trade person to person or small service to person) and B2C (adding commodities at backstage, and trade at front stage). The e- business platform discussed is mainly to provide the buyer and seller a only trade platform, to enable the seller to publish commodities selling online, and the buyer to choose the commodities to purchase. The website needs to guarantee the authenticity of the information published by both buyers and sellers, along with safe, convenient shopping and trading procedure. Currently the website hopes to attract large amount of user with free service. Later special service will be promoted to make profit, improve the e-business, win user’s trust, and increase trade amount. However, there are some question to face in current electronic business websites, like the bottle-neck of online trade, only honest trade and trading amount both increase will draw more companies to take part in electronic business websites, and lead to develop and prosperity of this business.

Abstract: The measure to improve the performance of the wireless network channel is of great significance to the building in the wireless network. Due to IPv6 Agreement is the agreement for the next generation network and the core of it, IPHC header compression technology provides IPv6 basic headers and expanding headers with a good support, so we adopt IPHC header compression scheme which groups the data that need to transmitting, introduce retransmission mechanism and header request mechanism to make IPHC have much compression effect on headers. But IPHC header compression scheme is hard on signal channel, it required that loss rate of transportation link is a little lower. In order to let IPHC better adapt to wireless link, compression based on link state is offered: Using simple portioned Markov model to check channel error rate, adopting RTS/CTS access mechanism to search for link state. Apply OPNET simulation software to imitate and finally achieve the desired target. In past two decades, computer network got rapid development, with the application of computers wider and wider. But because of being limited by areas and time, users couldn’t surf on the Internet, communicate with each other, and transport messages at any time and at any place. In this case, the wireless network developed, wireless network technology also produced therewith. Computer wireless network technology included IEEE802.11 collection [1], bluetooth technology, infrared technology, and broadband wireless technology afterwards and so on. Wireless communication technology contained CDMA, GSM, etc [2-5]. According to access ways, wireless access technology was divided into fixed wireless access technology and mobile wireless access technology with many small parts. Wireless access system consisted of wireless base station, wireless base station controller, operation maintenance center and user units. User units which contained single units and multiunits were connected directly with user terminals. Base station, which provided signal-sending and signal-receiving services for users in one district, was controlled by the controller called center station facility to provide an interface with base station side and operation maintenance center, wireless signal channel control and base station monitor, complete the connection of exchanges and routers. Operation control centre is responsible for operating and maintaining wireless access system machines and managing daily network operations.

Abstract: The article focuses on the research of a reliable data transmission extension protocol -- UDT based on UDP, the related implementation method and transmission control method of multimedia data real-time and reliable transmission, the improvement to algorithm of its related methods in specific applications; as well as the improvement to AIMD (Additive Increase and Multiplicative Decrease) congestion controlling algorithm, proposing DAIMD congestion controlling algorithm; the sending rate increment is changed from the constant quantity to the variable quantity which continuously reduces with the continuous increase of the sending rates, so it not only makes a more rational use of limited network bandwidth, also reduces the larger oscillation in the network data transmission; the improvement of validation mechanisms, propose validation mechanisms based on the combination of time and data packets numbers, and improve the efficiency of data transmission. When the multimedia data network transmits, the transmitter and receiver need to identify a network transmission protocol. According to the above analysis, UDP is a simple transmission level protocol, non-connection-oriented, and itself does not provide data retransmission and confirmation, therefore adopting UDP as the network transmission protocol can improve the data transmission efficiency, besides UDP supports the webcast function, suitable for multimedia data network transmission [1]. However, the characteristic of multimedia data network transmission requests the network transmission protocol can handle the phenomenon of delay and vibration in the transmission process; can handle bursting multimedia data transmission; can judge the network condition according to the reception quality of the receiver and the sender can make the appropriate response; can ensure the reliability of multimedia data network transmission and so on. Features of UDP its own design make it deal with such situations not very well, also UDP limits the sending data packet size each time; when the multimedia data network transmits, a video data often exceed this limit. Therefore, according to the previous analysis of multimedia data network transmission characteristics and technical requirements, this article studies the reliable data transmission extension protocol -- UDT based on UDP, and improves the related algorithm and control mechanism in the protocol to make it more suitable for the multimedia data network transmission in the embedded video surveillance system.