Density function theory is employed to determine frequencies character of the complexes of M-Thymine(M=Ca+,Ca2+,Mg+and Mg2+) at B3LYP/6-311+G（2df,2p） level.The frequencies are changed obviously when tautomers act with the cations.It is mainly because cations take part in molecule’s vibrations and change the force constants and effective mass.

The following thermo-physical properties are determined for Al-34%Mg-6%Zn（in wt.%） and Al-28%Mg-14%Zn alloys used for thermal energy storage applications,such as the specific heat capacity including solid and liquid state;the mass density in the temperature range 30～500℃;the melting temperature and the latent heat of fusion.The properties are measured by differential scanning calorimetry（DSC） and H-90 type dilatometer.The test results show that the melting temperature and latent heat of fusion for the two alloys are 454℃,447℃ and 314.4kJ/kg,303.2kJ/kg,respectively.Their density heated from room temperature to melting temperature are decreased by（1.05%）,（1.09%）,respectively.Their specific heat capacity are growing with the temperature increasing before the beginning of phase change,and are 1368.5 J·kg-1·K-1,1203.6 J·kg-1·K-1 at 445℃,respectively.The change of specific heat capacity are great due to the existing of latent heat of fusion during the phase transformation process.The measured results mentioned above are credible from the points of view of comparing with the value of theory calculation and error analysis of data.The mechanism that the effect of alloy compositions and phases on these properties is discussed in this paper.

Polyvinyl alcohol-chitosan hydrogel is synthesized.The effects of the mass ratio of polyvinyl alcohol and chitosan,the volume of acetum,the concentration of crosslinker on swelling ration are studied and optimized using orthogonal experimental method.The results show that the swelling ration of hydrogel is biggest when gelled at 55℃ with a volume of acetum of 100mL,a polyvinyl alcohol to chitosan ratio of 2,and a concentration of crosslinker of 0.213mol/L.The swelling ration of polyvinyl alcohol-chitosan hydrogel increases when the mass ratio ofpolyvinyl alcohol and chitosan and the concentration of crosslinker reduce and the volume of acetum increases.

A TLCS fingerprinting is established for ethyl acetate extract of CDYH,which will do a great deal of good for the quality standard of CDYH.The ethyl acetate extract is chromatographed by TLC with benzene∶ethyl acetate∶methanol∶formic acid（5∶1∶1.5∶5drops） and its chromatography is scanned by CS9000 TLCS at λs= 275nm and λR=365nm or λ= 435nm.A good separating TLCS fingerprinting is established,four peaks of which are identified as berberine,caffeic acid,ferulic acid and rhein.The method is simple and rapid with good precision and reproducibility for quality control of this preparation.

Catalysis kinetics characterization of douchi fibrinolytic enzyme（DFE）is studied.The results show that:the relative molecular weight is 41 970,the optimal reaction pH is pH7.0,DFE’s activity is the stablest at the pH range of 78,relatively stable at the pH range of 8-10,0 under the pH 4;the optimal reaction comperature is 41 ℃,enzyme activity is higher at the comperature range of 37-45 ℃;the stability of conservation is best at 15 ℃;Hg2+could remarkably inhibit DFE’s activity,Fe3+and Li+ could enhance it.When casein is used as a substrate,the reaction catalyzed by DFE is inhibited by the substrate.

Negundo Chastetree Fruit ethanol extract can be a natural food antioxidants.Therefore the study of its resistance to antioxidant activites is valuable.The conditions of extracting 100g flavone sample from Negundo Chastetree Fruit by ethanol are 250 ml ethanol,60℃～65℃,and 60h.The extract of 100g Negundo Chastetree Fruit for 3 times are 2.44g,1.23g,and 0.84g and the contents of flavoneare 11.52%,(11.51%,)and 9.50% respectively.0.030% extract could decrease POV in oil to 8.05% within 9 days,while 0.120% extract makes different result.The POV in oil changes little,as 0.020%Gallic acid third fat is added.The experiment indicates that antioxidant activites of the extract from Negundo Chastetree Fruit is relevant to the content of flavone,so it can be concluded that flavone is the most important antioxiactive component of the extraction from Negundo Chastetree Fruit.

In this article,the function mechanism of strengthening disinfection of waste-water treatment plant and four kinds of disinfection methods are introduced.By comparative analysis on economy and technology of disinfection methods, disinfection sodium hypochlorite is thought of as the first disinfection method of effluent for the middle-scale or small-scale waste-water treatment plant.

By adding high molecular weight flocculants intohigh turbid concentration suspensions with Yellow-River sediments,and by using settling technique and image analysis technology.The paper discusses bridging flocculation mechanism and development trends of aggregate sizes under different concentration of high molecular weight polymer.Meanwhile,the effects of various concentrations on fractal structure of the sediments aggregates are analyzed,quantitatively,by using the parameter "fractal dimension" characterizing fractal properties.Conclusions are drawn as follows: ①Bridging flocculation mechanism is dominant and charge neutralization mechanism is secondary for flocculation functions of cationic polymers to sediments particles;②Sizes distributions of bridging flocculated silts aggregates present generalized normal distribution under different concentrations of the polymer.There are three regions for sizes distributions of silts aggregates at different flocculation stages;③There is an optimum value about the concentration of a high molecular weight polymer.Under the proper concentration,flocculation efficiencies are ideal: the structures of bridging flocculated aggregates are compact,their settling velocities are great,the residual turbidity of the supernatant is low under the quiescent settling experiment and the fractal dimension value is high. 

With the application of continuum theory of mixture,a fully coupled mathematical model and the governing differential equation of the coupled problem of temperature,seepage and stress fields for equivalent continuum media of fissured rock mass are established.A set of fully coupled finite element formulae are obtained by fully coupled methods,and a 2-D finite element program for solving the equation is developed.The calculation results given with calculation example well reveal the varied behaviour of displacement,pore pressure and temperature under coupled action of seepage,stress and temperature,which indicates the mathematical calculation model and numerical program developed are reasonable and practical.

Based on the tests of RC beams strengthened with hybrid fiber sheet(HFS),the influence and effectof strengthening with carbon/aramid fiber sheet(C/AFS) on flexural strength for RC beams are analyzed.The variation of cracking and ultimate load,stiffness,etc.is studied.The experimental and numerical results calculated with finite element method show that flexural strength and stiffness of RC beam strengthened with HFS are obviously improved.Hybrid strengthening method is of feasibility and high efficiency.

This paper presents an elastic nonlinear buckling of a truss-arch structure.The effects of the perfect and the imperfect truss-arch structures on the stability behavior of structure are theoretically investigated by using the large displacement method and Newton-Raphson iteration.Some conclusions of the truss-arch structures design are drawn from the numerical results obtained in the study.

In the paper,according to the principle of the non-linear FEM,based on the fiber model of beam structure and the geometric and material non-linearity of the CFST structures,an approach is presented for the ultimate load capacity analysis of CFST structures with dumbbell sections.Then the limit loads of CFST columns with dumbbell section are computed,and the results verify the validity and accuracy of the proposed method.With the comparison of the limit loads of CFST columns under various influential parameters,slender proportionlimit load curves are obtained.

According to the differential geometry theory and counter-analysis principle,this paper deduces the spiral curve arc-length base equation of higher degree from its total construction.Applying the theory about the modern mathematics and the survey adjustment,it analyses the astringent properties in the arc-length base equation of the spiral curve and advances a method—the iterative method to get the arc-length of the spiral curve directly and precisely.Applying the technologyical project on "p substitute for A",making a breakthrough at the old and trouble method—"parameter estimate method "0,getting the arc-length of the spiral curve,the new technological project is used in the highway.There are some conclusions in this paper: the history that no arc-length base equation for the spiral curves has been closed;it is important that the special characteristics of the arc-length base equation may be employed universally in the curve composing and positioning.

According to a section of the old cement concrete pavement project in National Road 206 route,this paper investigates,analyzes,and examines the operational conditions of this old pavement,and presents the effective additional spreading course structure on the old cement pavement,and design measures of the pavement drainage system and pavement structure drainage system through the comparison and choice of the project construction program,which have instructive meaning for the structure design of the additional spreading course of the aged cement concrete pavement

In order to solve the problem of B-spline curve modeling based on physically deforming with geometry constraints,a method of freedom degree transformation is presented.For certain geometry constraints,by transforming the constrained degrees of freedom,the solution of the reduced unconstrained degrees of freedom finite element is obtained.Examples are presented to show the efficiency of this method.

LogiX gear is a new gear based on new tooth profile theory.When used in non-circular gear,logiX toothprofile can enlarge the gears’application area.This paper,based on the undercut theory of conjugate tooth profile,according to undercut theory of logiX circular gear,deduces condition expressions of logiX tooth profile non-circular gear under the condition that undercut is avoided.It provides the foundation for the design of the gear with small number of teeth.

This paper introduces the concept and function of an intelligent garbage can and puts forward a component plan.An infrared sensing and controlling system and a wireless communication system based on Single Chip Micyoco,which can realize some functions such as move,are adopted.Compared to the intelligent garbage can which has been used,the new one has more functions and aptitudes.

The design means of the news publishing system in the resource repository of environmental engineering speciality have been introduced in this article.Mainly explained are the configuration and design of the database,the structure and flow chart of the system,the design and realizationof the system function module,and the issuance and optimizationof the system,The news publishing system adopts ASP technology to realize the publish function of the environmental news.It provides speed and convenient circumstances as an environmental information intercommunion.

A new heuristic approach is proposed for the automated optimization of neural network.It combines fast optimal brain surgeon,dynamic optimization of learning parameters and fast cross-validation.The fast optimal brain surgeon optimizes architecture of neural network automatically.The dynamic optimization of learning parameters is able to dynamically vary its learning parameters and select optimal learning parameters.The fast cross-validation provides improvements of avoiding overfitting problem effectively.Experimental results demonstrate that with the heuristic approach,considerable performance gains are obtained compared to the other algorithms.This includes better generalization,optimal network architecture,and faster learning. 

Structured method and object-oriented method are the most popular software development methods today.This paper compares them with examples,discusses the characteristics and disadvantages which mainly exist in maintenance of structured method and cognition of object-oriented method,then analyzes the feasibility of integrating them into one to develop software,and gives the conclusion that integrated method can take greater effect than single method in certain situation.

After a great deal of investigations on the principle of BP model and the structure of the neural network,this paper manages to demonstrate how to increase the convergent speed of the BP neural network by optimizing the input of the network.Further more,a creative optimization technique—length extension technique,is presented here to improve the performance of neural network.After lots of experiments,this paper successfully increases the convergent speed of the BP neural network.

According to the fact that the electronic screen just needs a frame "8"to denote the 10 numbers from 0 to 9,it is attemped to take the numbers as a whole to be put to the frame "8"and then recognized.This text is put forward accoding to the tradional recognition method,the beeline is used to project while bias used in tradional recognition method.Projection is made to each frame of the frame "8"according to the shell character of the digit,and hand-writing numbers are changed to standard seven segments frame numbers,which can predigest the distilling of the feature of the number.Compare to the tradional recognition method,this one can be carried out much more easily.Its validity is proved in our experiment.

This paper introduces the configuration,main characteristic,work principle and program point of 12 bit ADC TLC2543 which has 11 inputs.It discusses the interface means of TLC2543 and MCS-51 SCM,Composes the SPI operation by software,and lists the interface circuit and SCM assembler of TLC2543 and MCS-51 SCM.

The importance and complexity of DO and COD control in sewerage are analyzed.According to the characteristics of DO and COD,fuzzy control methods are applied in DO and COD control.Two fuzzy controllers with two inputs are designed respectively for DO and COD control.A fuzzy control system based on single chip is designed.Experiment results show that the control system can ensure quality of wastewater processed.

This paper is devoted to investigate a kind of lattice Nicholson’s blowflies model with delay,and prove the existence of traveling wavefronts by upper-lower solution and monotone iteration technique.

Since the special theory of relativity came out,probing time-space transformation which is different from classic theory of relativity has always been an interesting topic for the theory-circles.The theory of relativity has experienced strict practice and has had sound groundwork.In order to explore a new time-space transformation in the field of the theory of relativity,from the concept of negative energy,the paper summarizes the developing process of negative energy from a physically assistant computing device to a real existing physical concept.Through theoretical analysis,the author discovers that the idea of the mass of negative energy particles being negative breaks some physical fundamentals,such as the second Law of Newton.A conclusion is drawn that the mass of negative energy particles is positive,and its time-space is different from ordinary matter.It is found that energy emission will take place while the negative and the positive energy particles interact.