In this paper each kind of equipment was systematically introduced,and the factors to affect the carbon preparation are in detail narrated.Synthesis of Multiwall carbon nanotubes by CVD Method need the following main equipment: fixed catalytic bed,boiling catalytic bed,spray catalytic bed,two-temperature fluidized catalytic bed,etc.The main influencing factors are the catalyst,the reaction gases,pyrolysis temperature,reaction time and so on.

H2C2O4·2H2O and ZnO used as raw materials,nanometer ZnO was prepared with rheological phase reaction method.The optimal preparation conditions were decided by orthogonal test.The precursor(ZnC2O4·2H2O) was synthesized by rheological phase reaction at 60℃.After 3h in 450℃,the precursor decomposed into nanometer ZnO.Precursor’s constitution and decomposition was characterized by FR-IR and TG-DTA,and substance phase and grain size of nanometer ZnO by XRD and TEM.According to the experimental result...

Al₂O₃-SiO₂-CaF₂ glass powder was prepared by liquid synthesis with AlCl₃、Na₂SiO₃、CaCl₂and NaF as starting-reagents.The influences of starting-reagents proportion on characteristics of the powders were studied by XRD、EDAX and TEM methods.The results show that reactant proportion has no effect on the chemical elements,SIZE appearance,size and crystal state of the powders,but it has great effect on relative content of chemical elements.The powders all have different proportional elements containin...

Sodium alginate-chitosan compound hydrogel used as carrier,to embed beer yeast,the influence of Such factors as the concentration of sodium alginate,immobilized time,the concentration of chitosan and tectorial membrane time on fermentation of immobilized beer yeast is studied and the flavor substance made by sodium alginate-chitosan immobilized beer yeast by 7964E type mass spectrum is analysed.The result shows that the flavor substance accords with ZhuJiang Beer,Kingway Beer and HeineKen.

This paper has studied atomic evolution and manipulation of two-level atoms in a high-Q micro-cavity,and has specially studied atomic evolution after introducing a π pulse for the first atom.It is shown that,the π pulse leads not only to the reverse of atomic evolution,but it also leads to the recurrence of the first atom evolution in the evolution of the second atom.Therefore,this shows an effective way to manipulate the atomic evolution,and quantum information transfer.We have also proposed a ...

The problem of robust stabilization for nonlinear control systems with infinite delay is discussed.Some conditions of robust exponential stability are obtained by utilizing Lozinskii’≥measure and differential inequality.

This paper deals with a problem of robust H∞ control for uncertain impulsive systems with multi-delay.A H∞ controller is presented in terms of linear matrix inequalities such that the closed-loop system is asymptotically stable and satisfies the H∞ control conditions for all admissible uncertainties.A numerical example illustrates the theoretical results.

The guaranteed cost robust control(GCC) problem is studied regarding a class of nonlinear systems with time-delay and uncertainty.Based on the LMI and Lyapunov stability theory,the existing conditions of the guaranteed cost controllers are given,which make the closed-loop systems stable for all admissible uncertainties,guaranteeing the cost bounded in a limitation.At last,some examples are presented to illustrate the validity of this approach.

The energy of graph G with n vertices is defined as the sum of the absolute values of all the eigenvalues of the graph.In this paper we discuss the relation of the energy of Bn,d and its diameter,and the Hosoya index is also discussed.

The traditional approach to gradient to search for the cost function’s extreme in the independent component analysis was based on kurtosis.The path we are looking for is crucial to the convergence of the algorithm.In the Kuicnet algorithm,after replacing the gradient of the cost function with its scaling we obtained a new ICA algorithm.Adjusting the path of the gradient timely in the iterative process,it accelerates the convergence.The simulation illustrates the effectiveness.

In view of the contradiction between the serious air pollution and the goal of less air pollution that people wish to achieve,this research,based on extension theory,solves a regional SO2 concentration contradiction problem.It builds the kernel model of the problem according to the framework of extension strategy generating system.It analyzes the various factors that affect regional SO2 concentration and their interactive causality by correlative net.It generates various strategies to solve the ...

This paper applied the basic principles of value engineering to integrally analyze the dynamic,economic and emission characteristics of engines supplied with ethanol-diesel blend fuel with different blended ratio of ethanol-diesel.It proposed an evaluation method for blended ratio of ethanol-diesel according to value coefficient which reflected the performance-value ratio.Evaluation results indicate that 15% blended ratio of ethanol-diesel is best for ratio of performance-value.

In order to resolve the problem of long assistant machining time,miniaturized EDM device with electrode direct driving mechanism has been designed,using an ultrasonic motor as its driver.The analysis of vibration modal is accomplished by using ANSYS.Further more,the optimal vibration modal and driving frequency have been implemented by animate function of ANSYS.The test of the whole system has been conducted,and the feasibility of the system has been verified.

With the BD6201,Rohm’s new product,this paper designed a 3-phase Brushless DC motor controller which can easily produce 3phase half/full-PWM square wave and sine wave,Which can meet the driving requirments of 3-phase Brushless DC motors.The controller can be applied to controlling air conditioner compressors and fans.

The characters of Zigbee Technology combined with wireless sensor network,the advantages of wireless sensor network based on Zigbee Technology are analyzed,and its application in the intelligent home network is presented.

Online/Offline signatures are used in a particular scenario where the signer must respond quickly once the message to be signed is presented.This paper presents two online/offline signature schemes from bilinear pairings.Without the random oracle assumption,these two schemes are proved secure.Furthermore,without increasing the overall computation,the new schemes’ online computation requires only about one fourth of that of the old schemes

Based on the development of the University Graduation Project(Thesis) MIS,this paper goes further into the theory of present optimizing technologies and methods,analyzes how to precisely use these technologies and methods,and uses relative tools to make quantitative analysis of them and the results after optimization.

A new approach to LED color image segmentation based on Gaussian function was proposed.By using color component value and carring on the filter through the Gaussian function template,the two value image of the useful numerical information could be attained directly.It changed the traditional methods of analysing after transfering color image to gray image.It fully used the color information.Facts show that this approach is fast and simple,that it can meet real-time demand,and that the segmentation effect is nice,so it is an efficient new algorithm.

The Identification of pointer meters’results on the basis of image processing is critical for pointer meters’ automatic checkup.For the angle method owns the shortcoming of imprecise result identification the image is proecessed after the pretreatment of the meters outfit image.Binary image extracted the useful imformation,with improved Hildtch thin to process binary image.Then,least square method is used to approximate meter head scales and pointer.On this basis,the method to combinate scale value considered as basis value with distance approach is proposed.The experiment concerned testifies the feasibility of the approach and shows that it has applied significance in the auto-examination of pointer meters.

In view of the present situation of the domestic single soccer lottery ticket,this paper designed the system based on the J2ME single soccer lottery ticket payment by handset.The system directly submits the customer bank information in the handset so that the large quantity of lottery tickets can be paid directly and the jot bonus can be returned automatically.The use of encryption strengthens the secret and the security of the data.

In order to guarantee the quality of driven pile and increase the efficiency of pile driving,one dimensional stress wave theory is adopted to analye the interaction mechanism of the system of hammer-pile-soil and establish the simplified model of dynamic pile driving,and analytical solution of penetration is presented in the thesis.It can quantitatively analyze affection of impact force,force duration time and penetration by some parameters including weight and drop height of the hammer mass,stiffness and thickness of cushion,and weight of cap cushion.According to curves of driving pile,the wave equation method is used to select optimum pile driving hammers and components of pile driving system.The Case studies indicate that estimated values are well consistent with measured one,which proves that the method is precise and effective.This method can provide valuable reference for optimum design and construction of pile foundation.

Based on the appropriate type of the element,material constitutive model,failure criterion and model of cracking and crushing,nonlinear FEA software ANSYS is used to analyse the nonlinear finite elements on the working mechanism of the concrete filled steel tubular column-beam joint with the column tube discontinuous in joint zone.The crack form and mechanical properties of the joint are studied.The calculation results show good agreement between the experimental and analytical results.

The finite element analysis of the single-span reinforced masonry structure supported on frame is carried on using the computer program of ANSYS.The transfer members with popular materials and geometric size are arranged according to the orthogonal rules.Based on the results of the audio-visual analysis and the variance analysis for the inner forces of transfer members,mechanical characteristics of the transfer beam structure are investigated and the most important factors affecting the inner forces of transfer members are ascertained.The approximate calculated formulas of the inner forces are given,which provides a theoretical reference for the design of the reinforced masonry structure supported on frame.

In view of the disease very lihely to be got by the steel bridge deck surfacing,the reasons for it are analyzed.The epoxy to meet the requirements of the cohesive course is presented in accordance with the cohesive role of the deck surfacing course and steel plate between the up and down deck surfacing course,and the epoxy bitumen concrete for the deck surfacing course is presented in accordance with the deck surfacing materials to have enough strength and toughness.It is argued that constructio...

La defense in Paris is a well-known CBD in the world.After 40 years of development,it has reached a remarkable scale,being especially successful in the system of pedestrian and roadway dimensional-dividing.The article first analyses the development of this dimensional system,then studies the organization of the dimensional roadway and dimensional pedestrian and the transferred system.This experience is valuable for the development of CBD in our country.

The intensive construction of public space at metro stations can facilitate the concentration of urban space.As for the development models of constructing public space at metro stations,four main patterns are presented including transferring system integration,pedestrian system networking,urban space three-dimension,and urban function combination.