Theoretical Analysis of the Effect of Mediator on the Reaction of the Enzyme Electrode

ＴｈｅｏｒｅｔｉｃａｌＡｎａｌｙｓｉｓｏｆｔｈｅＥｆｆｅｃｔｏｆＭｅｄｉａｔｏｒｏｎｔｈｅＲｅａｃｔｉｏｎｏｆｔｈｅＥｎｚｙｍｅＥｌｅｃｔｒｏｄｅＺＨＯＵＤｉｎｇ；ＹＵＸｉｕｊｕａｎ（周定，于秀娟）（Ｄｅｐｔ．ｏｆＡｐｐｌｉｅｄＣｈｅｍｉｓｔｒｙ，Ｈ...     

On the Angular Distribution of the Representative Points of Bases of Human Protein Coding Sequences

1IntroductionInlll,Zhangetaldealtwith1487humancodingsequences.Theyplot'tedtherepresent4tivepointSofthosesequencesinaCartesiancoordinatesystem.Theyfoundthatallthepointsarewithinaregulartetrahedronand,furthermore,allthepointSexceptonedistributeintheinscribedsphereofthetetrahedron.Theyalsoobservedtheradialdistributionofthosepoints.SofartheangulardistributionoftherepresentativepointSofbasesofhumlancodingsequenceshasnotbeeninvestigatedyet.Inthispaper,weproposeadiagranunaticmethodtoshowtheangular…     

Iteration of the Composition of Entire Functions

Let P(x) be entire and g(x) = λe^x, λ∈C- {0｝. If f= P(g) has no wandering domain, then nei-ther does h = g(P). The normal sets of h = g(P) and f= P(g) have no Baker domain at the same time.     

Study of the Characteristics of Piezoelectric Elements

ＳｔｕｄｙｏｆｔｈｅＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＰｉｅｚｏｅｌｅｃｔｒｉｃ　ＥｌｅｍｅｎｔｓＳＵＮＬｉｎｉｎｇ；ＡＮＨｕｉ；ＣＡＩＨｅｇａｏ（孙立宁，安辉，蔡鹤皋）（ＲｏｂｏｔＲｅｓｅａｒｃｈｉｎｓｔｉｔｕｔｅ，Ｈａｒｂｉｎｉｎｓｔｉｔｕｔｅｏ...     

Study of the Hole Wall Soil’s Capacity by the Action of the Bearing Device of Rodless Drilling Rig

In order to ensure the bearing device of rodless drilling rig to press stably against the hole wall, it has to analyze the contact between the soil pore wall and the bearing device to study whether the soil pore will shear failure. This paper uses the method to calculate the additional stress of any point in soil mechanics to get the three-dimensional stress state of any point of the soil pore under the support plate, and use the numerical analysis method to calculate the shear stress and its relative intensity. Under the circumstances of maximum torque and maximum pressure, ABAQUS is used to make a finite element analysis of the capacity of the soil pore. The results of numerical analysis and FEA indicate that in the condition of the support plate will not deform; the contact area between the soil pore and the support plate is rectangular; in the force process, the soil under the ends of the support plate have the trend of yield, while it meets the condition of Mohr-Coulomb not to yield generally.     

Amelioration of the mineral compositions and microstructures of the special ore sinters

Ｆｌｕｏｒｉｎｅ ｂｅａｒｉｎｇｍａｇｎｅｔｉｔｅｃｏｎｃｅｎｔｒａｔｅ ,ｖａｎａｄｉｕｍ ｔｉｔａｎｏｍａｇｎｅｔｉｔｅｃｏｎｃｅｎｔｒａｔｅａｎｄｓｉｄｅｒｉｔｅａｒｅｔｈｅｔｈｒｅｅｆａｍｏｕｓｏｒｅｓｗｈｉｃｈａｒｅｖｅｒｙｈａｒｄｔｏｂｅｓｉｎｔｅｒｅｄ .Ｆｌｕｏｒｉｎｅａｎｄｔｉｔａｎｉｕｍｉｎｔｈｅｍａｇｎｅｔｉｔｅｃｏｎｃｅｎｔｒａｔｅｈａｖｅｎｅｇａｔｉｖｅｉｍｐａｃｔｏｎｔｈｅｍｉｎｅｒａｌｃｏｍｐｏｓｉｔｉｏｎａｎｄｍｉｃｒｏｓｔｒｕｃｔｕｒｅｏｆｔｈｅｓｉｎｔｅｒ.Ｔｈｅａ…     

Effect of the column height on the performance of liquid–solid fluidized bed for the separation of coarse slime

A liquid–solid fluidized bed separator, used for the separation of coarse slime, was developed. Test particles sized in the range from 0.25 to 0.5, 0.5 to 1.0, and 0.25 to 1.0 mm were separated in the liquid–solid fluidized bed. Beds with column heights of 1200, 1500, and 1800 mm were tried. The clean coal and the tailings were subsequently analyzed by float–sink testing. The results showed that the ash and yield of clean coal both decreased with increasing column height, for all three size fractions, and that the ash of the clean coal obtained from tests on the broader size fraction was less than that from the narrower sized fractions. The separation density decreased with increasing column height. The lowest E value was seen for a column height of 1500 mm, for which conditions the separation density was 1.45 g/cm³. The E value was 0.084 for the 0.25–0.5 mm fraction but the corresponding separation density was 1.48 g/cm³, and the E value 0.089, for the broader 0.25–1.0 mm fraction.     

Fluvial Processes in the Meandering Reach of the Lower Wei River During the Course of Degradation

This paper presents an analysis of the changes of the longitudinal and lateral profiles in the meander- ing reach of the Lower Wei River over the period from October 1973 to October 1976 during the course of degradation.Analysis results indicated that retrogressive erosion and subsequent downstream erosion occurred in the reach due to the lowering in the Tongguan elevation and the inflowing water carrying low sediment con- centrations.At the end of the degradation,the main channel widths of the majority of sections were increased by 70 to 110 percent,and the elevation differences between the main channel and the floodplain were de- creased slightly by 2 to 45 percent,which caused a decrease in the water stage under the same discharge,the formation of a channd with relatively wide and shallow cross-sectional profiles,and an increase of 50 to 150 percent in the geomorphological coefficients.Therefore,the degradation in this reach was mainly characterized by channel widening,not by channel undercutting.     

Simulation of the influence of the baffle on flowing field in the anode baking ring furnace

In an anode baking horizontal flue ring furnace, the temperature distribution is one of the key factors influencing the quality of baked anode and is closely correlated with the gas flow. To understand the gas flow distribution in the flue, Navier-Stokes equation with “k-ε“ two-equation turbulence model was adopted and the simulation on the gas flow was performed. The numerical simulation results showed that the even direction of gas flow should be considered in the design of flue baffles and the gas flow distribution was really uneven in the flue in practical use. By adjusting the number and location of flue baffles rationally, the even distribution of gas flow can be improved obviously.     

Determination of the solvation film thickness of dispersed particles with the method of Einstein viscosity equation

The dispersion of a solid particle in a liquid may lead to the formation of solvation film on the particle surface, which can strongly increase the repulsive force between particles and thus strongly affect the stability of dispersions. The solvation film thickness, which varies with the variation of the property of suspension particles and solutions, is one of the most important parameters of the solvation film, and is also one of the most difficult parameters that can be measured accurately. In this paper, a method, based on the Einstein viscosity equation of dispersions, for determining the solvation film thickness of particles is developed. This method was tested on two kinds of silica spherical powders （namely M1 and M2） dispersed in ethyl alcohol, in water, and in a water-ethyl alcohol mixture （1：1 by volume） through measuring the relative viscosity of dispersions of the particles as a function of the volume fraction of the dry particles in the dispersion, and of the specific surface area and the density of the particles. The calculated solvation film thicknesses on M1 are 7.48, 18.65 and 23.74 nm in alcohol, water and the water-ethyl alcohol mixture, 12.41, 12.71 and 13.13 nm on M2 in alcohol, water and the water-ethyl alcohol mixture, respectively.     

Derivation of the general equation of the kinetics of phase transformation with nucleation and growth mechanism

The fundamentals of a new method of theoretically studying the kinetics of the phase transformation with nudeation and growth mechanism are demonstrated.Startingfromfinite,heterogeneous system,the survival probability of the individual sites for the given annealing time can be calculated by the present treatment,so that the kinetics equation under general conditions can be derived.In comparison to the classical treatment,the new derivations are not only rigorous and transparent,but also can be used to deal with the non-homogeneous systems and the non-steady process.Also the problems concerning the interference of more than one simultaneously occurring transformations and the correlation between different sites can be studied.     

First-Principles Study of the High-Temperature Behaviors of the Willemite-Ⅱ and Post-Phenacite Phases of Silicon Nitride

The structural and elastic properties of the recently-discovered wⅡ- and δ-Si_3N_4 are investigated through the plane-wave pseudo-potential method within ultrasoft pseudopotentials.The elastic constants show that wⅡ- and δ-Si_3N_4 are mechanically stable in the pressure ranges of 0-50 GPa and 40-50 GPa,respectively.The α→wⅡ phase transition can be observed at 18.6 GPa and 300 K.The β→δ phase transformation occurs at pressures of 29.6,32.1,35.9,39.6,41.8,and 44.1 GPa when the temperatures are100,200,300,400,500,and 600 K,respectively.The results show that the interactions among the N-2s,Si-3s,3p bands(lower valence band) and the Si-3p,N-2p bands(upper valence band) play an important role in the stabilities of the wⅡ and S phases.Moreover,several thermodynamic parameters(thermal expansion,free energy,bulk modulus and heat capacity) of δ-Si_3N_4 are also obtained.Some interesting features are found in these properties.δ-Si_3N_4 is predicted to be a negative thermal expansion material.The adiabatic bulk modulus decreases with applied pressure,but a majority of materials show the opposite trend.Further experimental investigations with higher precisions may be required to determine the fundamental properties of wⅡ- andδ-Si_3N_4.     

Study of Interrelation on the Frature Geochemistry and the Field of Structural Stress in the Structural System of Metallogenesis at Malage Orefield of the Gejiu Mine Area, Yunnan

This paper deals with a study of interrelation on the fracture geochemistry and thestructural stress field in the structural system of metallogenesis using the methods of the multivariate statistical analysis and the finite element on the basis of the analysis of the generation and evolution of structural systems and the structural system of metallogenesis in the Malage orefield, and revealed that the whole processes of the petrogenesis and the metallogenesis including the emplacement of magma, the infiltration of ore-bearing thermal fiuids, the precipitation of metallogenic materials and the formation of deposit are driven and controlled by the dynamic evol(?)tion of the structural stress field, so as to provide a basis of the theory for the prognoses of location and quantity of the hidden deposit.     

Validation of the numerical simulation of fluid flow in the continuous casting tundish

The 3-dimensional fluid flow in a water model of the continuous casting tundish is simulated with the k-ε two-equation turbulence model. The methods to decide the size of wall-adjacent grids and the effects of residuals and mesh size on the simulation accuracy are discussed. The current investigation concludes that the following condition should be satisfied to get accurate enough simulation results: (1) If the dimension of the domain is in the order of cubic meters, the average size of cells in the mesh system should be at least smaller than 30 mm; (2) The normalized non-scaled residual should be reached at least smaller than 10^-4.     

Study of vehicle accident reconstruction based on the information of the tire marks

The tire mark is the important legacy information left at the accident scene. Based on the vehicle collision dynamics model, this study provided an optimized algorithm with vehicle final location and other related information for the tire marks. When the tire marks simulation results fit the real one well, the state of vehicle can be understood as the real state in the accident. Based on above, the vehicle velocity and direction are decided. According to the velocity and direction of the vehicle, the complete accident process can be simulated. With the help of the Pc-Crash software, the method has been applied in typical collision accident cases analysis. The reconstruction results will provide the scientific and numerical references for vehicle collision accidents analyzing and appraising.     

Response of flood discharging capacity to the deterioration of the lower Yellow River

1IntroductionAnalluvialriverisacomplicatedsystem.Itsbedconfigurationadjustscontinu-ouslywiththeprocessofscourandsiltingofthechanneltomeetthevariationsofflowandsedimentloadaswellastheinfluencesofhumanactivities.Asafeedback,theflowdischargingcapacityisthenaffectedbytheadjustmentsofchannelconfiguration.Nu-merousstudieshavebeenconductedonthefunctionalrelationshipbetweenthedynamicconditionsofflow-sedimentloadandthechannelconfiguration.Forexample,Qian(1965)establishedaformulaforchannelmorphologycon…     

Theoretical Analysis of the Application of Immobilized Cells to the Continuous Fermentation Process

This paper theoretically studies the continuous immobilized cell (IMC) fer mentation system. A kinetic model of IMC is established, and the relational expressions between production rate, substrate concentration, biomass concentration and dilution rate in the IMC continuous stirred tank reactor (CSTR) are derived. These equations and some numerical calculations show that as compared with the free cell system the IMC system has many advantages: high production rate, steady operation, and being independent of the dilution rote. They also indicate that the diffusion of substrate is a constraint to the production of metablite.