An approximately exponential behavior of the efficiency and the series resistance of solar cells has been deduced using numerical analysis of I-V characteristics.

Using numerical analysis and visual technology, the parameters of the known Rayleigh van der pol equation are discussed in detail The relation between the limit circle and chaos strange attractors is found

通过数值分析及科学可视化技术 ,对著名的 Rayleigh Van Der Pol方程的参数进行较详细的讨论 ,获得该方程的混沌吸引子与极限环的关系 .

In this paper, base on engineering practice, introduce the procedure of solving the stress and deformation of T beam using numerical analysis of finite element method, And the equivalent load application in the finite element method.

Through analysing the principles and characterisics of relieving grinding of hob, an accurate calcultion method of axial profile of grinding wheel for relieving ZC_1 wheel hob has been presented using numerical analysis, progressive progression and optimization etc, and a software on microcomputer with multiple functions has been worked out as well. These provide reliable theoretical bases for the manufacture of ZC_1 wheel hob with high precision.

The“interface withdrawal”across the α/β interface in Cu:Cu-Al diffusioncouples during quenching has been investigated. Using numerical analysis basedon the Fick's second law,the non-isothermal diffusion modeling across the α/βinterface was carried out in comparison with the experimental results.

The worst-case time delay of two and three parallel interconnect lines in 0.25 μm technology is estimated using numerical analysis, and simple empirical formulas for time delay have been derived, which take into account both the drive resistance and load capacitance.

Bifurcation diagrams developed using numerical analysis of the model have been drawn with two variable parameters, an exchange ratio, σ, and a volume ratio, κ.

Using numerical analysis we show that in a region of relatively low frequencies, when only one propagating wave exists in the wave conductor, one can formulate an analog of Saint-Venant's principle.

Further, in order to get the maximum annual sustainable yield, we optimize the harvesting using numerical analysis; in addition, we find that the harvesting timing affects the maximum annual sustainable yield.

The DEP forces for particles in a suspension were calculated using numerical analysis.

All of the methods attempt to approximate this relationship using numerical analysis methods.

The“interface withdrawal”across the α/β interface in Cu:Cu-Al diffusioncouples during quenching has been investigated.Using numerical analysis basedon the Fick's second law,the non-isothermal diffusion modeling across the α/βinterface was carried out in comparison with the experimental results.The distan-ce of interface withdrawal depends on the initial concentration profile at thehigh temperature,the diffusion annealing temperature,the diffusion coefficients,the cooling rate and the slope of the solves...

The“interface withdrawal”across the α/β interface in Cu:Cu-Al diffusioncouples during quenching has been investigated.Using numerical analysis basedon the Fick's second law,the non-isothermal diffusion modeling across the α/βinterface was carried out in comparison with the experimental results.The distan-ce of interface withdrawal depends on the initial concentration profile at thehigh temperature,the diffusion annealing temperature,the diffusion coefficients,the cooling rate and the slope of the solves curves in the phase diagram.Thewithdrawal effect influences the shape of the concentration profile and the inter-facial concentration.

In Sm-Co system, there are two kinds of important intermetallic compounds:SmCo_5 and Sm_2Co_17. SmCo_5, being CaCu_5 crystal structure, belongs to hexagonal system. Sm_2Co_17 is crystallized in two modifications, a low-temperature phase of the rhombohedral Th_2Zn_(17-)type structure, named as ;θ-phase; a high-temperature phase of the hexgonal Th_2Ni_(17-)type structure, named, as θ'.There is close relationship between θ,θ'and hexgonal type SmCo_5 in crystal structure. As soon as one third of Sm atom is replaced...

In Sm-Co system, there are two kinds of important intermetallic compounds:SmCo_5 and Sm_2Co_17. SmCo_5, being CaCu_5 crystal structure, belongs to hexagonal system. Sm_2Co_17 is crystallized in two modifications, a low-temperature phase of the rhombohedral Th_2Zn_(17-)type structure, named as ;θ-phase; a high-temperature phase of the hexgonal Th_2Ni_(17-)type structure, named, as θ'.There is close relationship between θ,θ'and hexgonal type SmCo_5 in crystal structure. As soon as one third of Sm atom is replaced by a couple of Co atoms in SmCo_5 and the replaced position is arranged as ABCABC....along the C axis the Th_2Zn_17 type of Sm_2Co_17 is formed. On the other hand if the replaced position is arranged as ABAB....along the C axis then Th_2Ni_(17-)type of Sm_2Co_17 is formed.According to the structural feature mentioned above it might be considered that two essential kinds of compound layers actually compose interphases SmCo_2(Φ),θ-Sm_2Co_17 andθ'-Sm_2Co_17 in Sm-Co system. One is SmCo_5 which is denoted as X. Another denoted as X' is Co_2Co_5 and derived from the X by replacing Sm with a couple of cobalt. It may be denoted as X_A', X_B' or X_C' respectively according to the replaced positions. The alternative of the replaced positions claims three different positions of Sm in hexagonal structure.By this method mentioned above the stoichiometric phases of SmCo_5, ;θ-Sm_2Co_17,and θ'-Sm_2Co_17 may be denoted as X, XXX_A'KXX_B'XXX_c' and XXX_A'XXX_B'. The pure Co which has the same structure of X may be denoted as X'.The Gibbs free energy expression of thermodynamic model in every phases of solution can be expressed according to the feature of crystal structure mentioned above.The Gibbs energy of φ phase, the composition of which ranges from pure Co(Co_2Co_5) to SmCo_5 can be denoted as following:G_(m~φ) is free energy of one mole of solutlon (Sm, Co_2)Co_5 is free energy of one mole of Co_2Co_5 is free energy of one mole of SmCo_5 I~φis the interaction parameter of one mole (Sm, Co_2)Co_5 solution y_x and y_x' are the mole fraction of either compound layer in φ phase, and Y_x+Y_x'=1.Because X' is formed by means of replacing one Sm atom X with a couple of Co atoms, according to the law of conservation of mass the following relations between X and the mole fraction of two compound layers y_x and y_x' should be obtained when the composition of solution is X (X' is supposed to be the mole atom fraction of Sm atom in the Solution of i phase in the following discussions).y_x=7X/(1+X) and y_x'=l—y_x (2)They demonstrate the relationship between chemical composition and structrual composition.The free energy of one mole atom can be demonstrated as:The Gibbs energy of θ and θ', the composition of which varies from SmCo_5 to Sm_2Co_17, may be demonstrated as following:i can be θandθ' in this equation. It is self-evident that as far as is concerned ,it shoul be when i is θ, it should be is concerned,it should be when i is θ, it should be when i is θ'. I~i is the interaction parameter of θ or θ'. This model is described by the system which is composed of two compound layers of XXX and XXX'.According to the feature of structure the relationship between chemical composition and structrual composition can be demonstrated as:The average Gibbs energy of one mole atom is:gy G_(Sm)~φ, G_(Co)~φ, G_(Sm)~θ and G_(Co)~θ of every phase. The calculation of phase equilibrium between φ and θ is carried out by the application of following equilibrium equations and experimental data:G_(Sm)~φ(X~φ,T)=G_(Sm)~θ(X~θT), G_(Co)~φ(X~φ,T)=G_(Co)~θ(X~θ,T)X~φ and X~θ in the equatiotis show the mole fraction of Sm in the solution when two phases are in equilibrium.By taking this parameter into equitions (3) and (6),and taking and as reference standard the curve of free energy can be drawn at different temperatures.By bringing this parameter into (7) and using numerical analysis method the equilibrium boundary can be calculated. Result shows that the model mentioned above is practical.

Experimental and theoretical results of Intense Relativistic Electron Beam (IREB) propagation in low pressure neutral gases are presented. For an electron beam of 660kV, 40kA, and 100ns in pulse width, FWHM, injected into a drift tube filled with H2 and N2,the pressure region in which IREB can be propagated efficiently is in P=(0.7-6.7)×102Pa, and a propagation efficiency up to 80% has been obtained. In very low pressure (P=13.3Pa), because of spatial charge effect the beam electrons are stagnated by a virtual...

Experimental and theoretical results of Intense Relativistic Electron Beam (IREB) propagation in low pressure neutral gases are presented. For an electron beam of 660kV, 40kA, and 100ns in pulse width, FWHM, injected into a drift tube filled with H2 and N2,the pressure region in which IREB can be propagated efficiently is in P=(0.7-6.7)×102Pa, and a propagation efficiency up to 80% has been obtained. In very low pressure (P=13.3Pa), because of spatial charge effect the beam electrons are stagnated by a virtual cathode and expand radially,and the propagation efficiency is low. At relatively high pressure, in addition to electromagnetic field and electron's Coulomb scattering by gas molecules, plasma instability would result in decrease of propagation efficiency. Simulations of charge neutralization using Monte-Carlo and current neutralization process using numerical analysis have been done, and explanations of experimental results have also been made.