Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2008, 29(2):87-91,110. DOI: 10.7535/hbkd.2008yx02001
Abstract:This paper studies robust passive stability problems for time-varying delay non-linear systems through Takagi-Sugeno (T-S) fuzzy model approach. Based on Lyapunov-Krasovskii function, a sufficient condition in terms of linear matrix inequalities for the solvability of the problems is presented, which is dependent on the size of the delay. A numerical example is given to illustrate the effectiveness of the theoretical result.
2008, 29(2):92-95. DOI: 10.7535/hbkd.2008yx02002
Abstract:This paper introduces on spaces homogeneous type Triebel-Lizorkin space [AKF·]β,∞p which is defined by Lipschitz function and Calderon-Zygmund singular integral operator T, and it introduces two commutators Cf,Caf which are decided by fractional integral operator Iαf(x).It also proves their boundedness on Lebesgue function spaces.
2008, 29(2):96-100. DOI: 10.7535/hbkd.2008yx02003
Abstract:By using a fixed point theorem in a cone,the sufficient conditions of the existence of positive solution for high-order BVPs with all derivatives are provided.Firstly the associated Green''s function is given.Then the growth conditions are imposed on the nonlinear term which ensure the existence of positive solution to the problems.
2008, 29(2):101-103,148. DOI: 10.7535/hbkd.2008yx02004
Abstract:The present study of singular integral operator is basically with standard kernel.This paper declines the condition of kernel to Dini-type condition and obtains some weighted norm inequalities for the singular integral operator with Dini-type kernel.
2008, 29(2):104-110. DOI: 10.7535/hbkd.2008yx02005
Abstract:In view of the shortcomings of poor structure features and systematicness of current fuzziness metric, by combining fuzziness characteristic function with fuzziness-synthesizing operator, we establish F+S fuzziness metric model,and give tectonic models of the fuzziness characteristic function based on quasi-linear function and synthesizing operator model based on measure theory. Further,we apply F+S fuzziness measure into comprehensive evaluation. The results show that F+S fuzziness measure system has good operability, and can effectively merge the decision consciousness into the information processing, so it can be widely used in many fields such as artificial intelligence, optimizations in complex manufacturing systems.
2008, 29(2):111-114. DOI: 10.7535/hbkd.2008yx02006
Abstract:Dyson''s equation with two defects in quasi-1D wire is derived by using Green''s function method.The transmission coefficients and the reflection coefficients are given with the two lowest normal modes.The transmission coefficients relate with both the intrasubband Green''s function and the intersubband Green''s function.
2008, 29(2):115-118,172. DOI: 10.7535/hbkd.2008yx02007
Abstract:In this paper, the new experimental scheme to measure the gravitational constant G among big objects is introduced. Firstly, the overall arrangement of the new experimental scheme is presented. Then, the anticipated observation value is analyzed, which shows the displacement of the small object''s shadow on the screen. Finally, the error in the new experimental scheme is analyzed and the method to reduce the error is put forward.
2008, 29(2):119-123,145. DOI: 10.7535/hbkd.2008yx02008
Abstract:Based on the structure of the round cage filter, a fluid dynamic model is set up. This paper makes theoretical and experimental researches on its filtering performance, including velocity spread and filtration resistance in the cross section and channels. The study shows that the theoretical values and actual values of its performance are in high uniformity. The velocities in the channel are not in linear relation with the distance to the entrance,the velocities at each cross section are in inverse-parabolic curve status along the length of the channels.This model can play an important role in improving the filtering performance of the round cage filter.
2008, 29(2):124-127,136. DOI: 10.7535/hbkd.2008yx02009
Abstract:The vibration differential equation of bridge structure is converted into the general format of PIM (precise integration method) in order to identify the moving load of bridge structure and to analyse the effect of various parameters on the identification. The HPD-S format of PIM for moving load identification is then obtained. by using Matlab numerical technique, the effects of some primary parameters,such as measurement noise, mode number, vehicle speed and sampling frequency,are discussed. Numerical results show that the method is not sensitive to the number of modes,whereas it is sensitive to sampling frequency.And the measurement noise and vehicle speed are identified as the two main obstacles leading to erroneous results. With a good choice of these parameters, it can identify moving load effectively, which is a good guide for engineering application.
2008, 29(2):128-132. DOI: 10.7535/hbkd.2008yx02010
Abstract:Density functional theory (DFT) is employed to investigate atomic layer deposition (ALD) mechanism of hafnium oxide (HfO2) and alumina (Al2O3) on silicon surface. The ALD process using HfCl4and Al(CH3)3as precursors in this study involves two alternate deposited half-reaction:1) HfCl4with Al—OH surface sites, and 2) Al(CH3)3with Hf—OH surface sites. Both half-reaction proceed through an analogous trapping-mediated mechanism. The intrinsic reaction coordinate studies also show both of them proceed the same transition state and reaction path of HCl elimination regardless of the surface cluster size. In addition, if the surface temperature is raised, the desorption of intermediates in reaction 1) will be enhanced while the activation energy will be decreased, and the activation energy of reaction 2) will be basically unchanged.
2008, 29(2):133-136. DOI: 10.7535/hbkd.2008yx02011
Abstract:The water solution radical copolymerization of methylacrylic acid and sodium p-styrene sulfonate is studied with potassium persulfate and sodium bisulfite as the initiator. The effects of monomer concentrations, initiator concentrations and reaction temperatures on copolymerization rates, determined by the dilatometer method, are inspected, and the results indicate that the copolymerization rates increase with the incretement of monomer concentrations, initiator concentrations and reaction temperatures. The copolymerization dynamic relationship is obtained, and the apparent activation energy is 58.97kJ/mol.
2008, 29(2):137-145. DOI: 10.7535/hbkd.2008yx02012
Abstract:Based on the basic physical chemical experiment of first order reaction, this paper gives detailed analysis of six data processing models. Through analysis of different data processing models, the data processing and mapping can be simplified, the error of mapping can be minimized, and level of expericements and the accuracy of data processing results can be improved.
2008, 29(2):146-148. DOI: 10.7535/hbkd.2008yx02013
Abstract:Bis(diphenylmethy1)7(R)-glutaroy lamino-3-hydroxyceph-3-em-4-carboxylate 1(S)-oxde is used as starting material to react with dichlorotriphenyl phosphine for synthesis of diphenylmethyl 7(R)-amino-3-chloroceph-3-em-4-carboxylate HCl salt by using“one pot” technology.Cefacor is synthesized by using phenylglycin chloride HCl salt as acylation reagent. The structure of cefacor is confirmed by IR,NMR and MS.
2008, 29(2):149-151,168. DOI: 10.7535/hbkd.2008yx02014
Abstract:Cold-formed steel is a widely applied material, and its rolling quality is decided by pass. Available pass design mainly depends on empirical formula and empirical parameter, so the designed pass often needs actual correction. The method proposed in this paper can provide theoretical basis for design pass and decrease abundant redundancy data. The contact characteristic finite strip of characteristic finite strip can better ananlyze the deformation process of steel strip,which provides instructive effect to the intelligence of pass design.
2008, 29(2):152-157,176. DOI: 10.7535/hbkd.2008yx02015
Abstract:By using ASP.Net technology, a CAPP and MES integrated information management system based on the browser/server(B/S) three-layer network structure is developed. The structure, functions and characteristics of the system are introduced. It proves in the practical application that manufacturing information is integrated and shared between departments in an enterprise, and it is a better manufacturing information management system.
2008, 29(2):158-160. DOI: 10.7535/hbkd.2008yx02016
Abstract:With the density of FPGAs increasing, the need for larger configuration storage is also increasing. This paper introduces several modes of the FPGAs configuration, then proposes a scheme of using MaxII CPLD and Flash memory to configure FPGAs, finally produces the system scheme, hardware schematic and software flow.
2008, 29(2):161-164. DOI: 10.7535/hbkd.2008yx02017
Abstract:The paper analyzed the present situation of software quality and the factors influencing software quality. Then it discussed the influence of organization form on the development of software, and put forward methods for increasing software quality.
2008, 29(2):165-168. DOI: 10.7535/hbkd.2008yx02018
Abstract:This paper focuses on a nonlinear system. First, the fuzzy inference modeling method based on the data of input-output is applied to first-order nonlinear system, and a mathematical model is deduced. Then, the important tool, variable-universe adaptive fuzzy control method is used in the model directly. Finally the simulation experiments are carried out on different inference inputs, and compared with the standard fuzzy control. The results indicate the variable-universe adaptive fuzzy control based on the fuzzy inference model is widely applied with real-time and quick response.
2008, 29(2):169-172. DOI: 10.7535/hbkd.2008yx02019
Abstract:According to topographic and geomorphologic characteristics of the cities in northern plain,the river water level,the rainfall centralization and the rainwater mouth on accepting water situation in summer,some key elements are analyzed in several municipal rainwater pipe network designs,such as inlet time,catchment area,runoff coefficient, recurrence interval,flood velocity of flow,and the rainwater accepting well.The methods of choosing the best fetching value are proposed in order to achieve the goal of optimizing design.
2008, 29(2):173-176. DOI: 10.7535/hbkd.2008yx02020
Abstract:A random survey in six districts of Tianjin City on residents and formaldehyde test of houses that have been decorated for a year and resided,shows that formaldehyde pollution is very serious in decorated houses with a 100% occurrence in the specimens.Only 14% of the surveyed houses are up to the national standard.The ocourrence of respiratory diseases is on an obvious increase accompanied by uncomfortable feelings to different extent,and rarely with some allergies,Green decoration,indoor greenization and suspended residence are some of the basic means to prevent indoor formaldehyde harm to the largest extent.