One-cycle Technique Based Adjustable Ac Source

By using one-cycle control theory, a novel voltage source inverter is proposed. The conventional one-cycle control technique needs that the integrator is reset instantaneously. But it is very difficult to realize with hardware due to the finite time constant of the reset circuitry. Therefore, based on the one-cycle technique, the paper gives a new control scheme to resolve the problem with dual switched integrator, and the performance of the integrators is close to ideal. The paper also uses the dc offset to implement the voltage measurement. Furthermore, the amplitude and frequency of the output voltage are effectively adjustable. The one-cycle control technique not only provides fast dynamic response, but also can admirably suppress the perturbation yielded by dc source and abate the undesired harmonic contents. Simulation studies were performed to prove the proposed scheme. The results show that the one-cycle control based voltage source inverter makes good use of dc source that is 92.8% and THD is only O. 255 9%.     

Mechanism and Progress About Protein Crystal Growth by Atomic Force Microscopy

Atomic Force Microscopy(AFM) plays a very important role in researching crystal growth mechanism, especially protein crystals. The principle of AFM for protein crystal examination is briefly described as well as the importance of research on protein crystal growth, known growth mechanisms including 2-D steps nucleation, spiral dislocation, normal growth, 3-D nucleation and anisotropic development, and latest progress about eucommia antifungal protein(EAFP) and Trichosanthin(TCS) protein crystal growth mechanism, respectively. Finally, protein growth under microgravity environment is also expounded here and their development tendency and practical prospect.     

Ecological Technology Strategy-the Typologic Analysis and Research of Double-Skin Facade

As a renovation envelope, double-skin facade has the characteristics of environmental function and unique aesthetic effect. In this paper, the composition and functional characteristics of double skin facade is introduced briefly, its development history and a detailed typologic analysis combined with typical cases is reviewed. It is pointed out that the double skin facade has a bright future in 21~(st) century and the function and aesthetics are the footstone for its typologic research.     

Water model study on flow optimization of five streams L-type tundish

In this paper, the water model method is used to optimize the flow behavior of asymmetrical five streams L-type tundish in a steelmaking plant. The results show that the optimization plan is set up with turbulence suppressor T+ vice guide wall D2+ main guide wall with three holes (D1a) which consists of top two holes with 25° inclination and one hole with 30° inclination below. With this plan, the time which the colorants reach to the outlets increases, the difference of response time in all outlets decreases, the peak concentration of the RTD reduces, the existence time of high concentration liquid steel extends, and the ratio of dead zone in each streams reduces.     

Exploration of the Sustainability Design for Industrial Building

Within the domain of comprehensive architecture, the general instructive principles for the sustainability design are applicable to that of industrial building. Based on the analysis of excellent precedents, in this paper, some useful experiences are summarized. It is pointed out that the sustainability design is feasible and should be compulsive for industrial building.     

Acoustic Evaluation of the Concert Hall Based on Simulated Impulse Responses

The impulse responses and other acoustical parameters of Huangpu Teenager Palace were measured. Meanwhile, the acoustical simulation based on software ODEON was carried out as well. The parameters based on computer simulation are compared with the measured ones. This case study shows that the auralization technique based on computer simulation can be used for predicting the acoustical quality of a hall at its design stage.     

Methods and Techniques to Enhance the Production of Secondary Metabolites in Hairy Roots

Hairy roots culture is a new means to gain the plant secondary metabolites. How to enhance the production of secondary metabolites in hairy roots becomes a new hotspot recently. The authors summarize recent trends and results about the increase of the production of secondary metabolites in medicinal plant hairy roots. The change of culture conditions and the application of biotechnologies can enhance the production of secondary metabolites in hairy roots.     

Application of Multivariate Statistics in Early-warning of Corporation Financial Crisis

This paper is focused on early warning of corporation financial crisis for the China's household electric appliance manufacturers in stock market. Firstly, using company's open-disclosed annual statements as data resource, the financial indexes system is constructed. Secondary, adopting the multivariable statistical analysis method, such as cluster, discriminate and principle component analysis, the multivariate models for the empirical study on early warning of financial crisis by making use of SPSS statistical software are set up. The corporation might discover the financial affairs crisis that shall probably arise beforehand by using the financial affairs crisis early warning system. This study and analysis may serve as reference for domestic industries and enterprises.     

Enterprise Culture and Enterprise Credit in Enterprise Core Competitive Force

Based on the content of enterprise culture and enterprise credit, it is pointed out that the enterprise culture related to the enterprise core competitive force.In this paper, from the viewpoint of combining theory with practice, the intension, function and mutual relations between them are described and their significance in the market competition as well.The potential things,which the enterprise staffs are seeking for, from its inherent mind and the enterprise theory are the enterprise culture which becomes the enterprise core competitive force in its actual sense.The enterprise credit, as the enterprise culture in its ideological sphere, is an essential factor, which greatly affects the enterprise core competitive force.At last the authors provide some good suggestions on how to cultivate enterprise credit and to build enterprise culture.     

File Intertransmission Based on WinSock Component

WinSock is a group of API,which is used to transmit data and exchange information on Internet,the Socket Application programme impoldered by users may communicate with other Socket Application programes by Internet. Delphi provides Socket components,which sustains the TCP/IP protocol and makes the Internet programming acquiring much more flexibility.This paper probes that how to realize transmission of files in any format under nonblocking mode between clients and servers by means of Socket components of Delphi.