Element Calculations Research Articles

Creep Inverse Problem of the Power Reactor Fuel Assembly Elements Contact Interaction

Creep inverse task solution for parameters identification of Zr1Nb alloy creep law is considered. Zr1Nb alloy is commonly used as a structural material for power reactor core elements. Strength and reliability justification of the fuel assembly (FA) components, manufactured from Zr1Nb alloy, requires the knowledge of the relationship between the intensity of creep strain rate, temperature and stress intensity. However, FA elements analyses performed using the known coefficients for the Zr1Nb alloy creep law, are not consistent with the experimental data. In this paper the results of parameters identification Zr1Nb alloy creep law are shown. The results are obtained using the numerical and experimental investigations of contact interaction between fuel rod and spacer grid cell. Numerical experiments, performed using verified creep law, are close to the experimental data. The results of this research can be used for a wide spectrum of thermal strength calculations of FA elements manufactured from Zr1Nb alloy.

Конфігураційна взаємодія в зображенні вторинного квантування: основи й застосування аж до повної КВ

Mathematical formalism of the second quantization is applied to the configuration interaction (CI) method in quantum chemistry. Application of the Wick’s theorems for calculation of the matrix elements over configurations leads to a simple logical scheme which is valid for configurations of an arbitrary complexity and can be easily programmed.

Formation of optical beams with given intensity distribution in transverse plane for deposition and positioning of microscopic objects

We propose a procedure of calculation of diffractive optical elements (DOE) for formation of optical beams with a given intensity distribution in the transverse plane. We use the superposition of zero-order Bessel beams with certain parameters allowing us to calculate light fields possessing non-diffracting properties along an intercept of the optical axis. We present the experimental results proving the non-diffracting properties of such beams. We showed that such beams make it possible to deposit polystyrene microspheres with a diameter of 5 μm and to posit them at the given points.

X-ray microanalysis of uranium dioxide particles by using low electron beam energy

The elemental analysis results of the various size uranium dioxide fragments, performed with a scanning electron microscope (SEM) equipped by X-ray energy dispersive analyzer (INCA x-act, “Oxford Instruments”, Great Britain), are presented. The elemental composition calculation was carried out applying the pre-installed program based on the XPP matrix correction algorithm. It is shown that for the bulky UO2 samples, measured with the varied accelerating voltage in range of 6–20 kV, the uranium concentrations slightly differ (relative uncertainties doesn’t exceed ±2%). The composition of uranium dioxide particles sized up to 0.5 μm can be defined using beam energy of 6 keV with typical for bulky sample accuracy.

Sticker Systems Over Monoids

Molecular computing has gained many interests among researchers since Head introduced the first theoretical model for DNA based computation using the splicing operation in 1987. Another model for DNA computing was proposed by using the sticker operation which Adlemanused in his successful experiment for the computation of Hamiltonian paths in a graph: a double stranded DNA sequence is composed by prolonging to the left and to the right a sequence of (single or double) symbols by using given single stranded strings or even more complex dominoes with sticky ends, gluing these ends together with the sticky ends of the current sequence according to a complementarity relation. According to this sticker operation, a language generative mechanism, called a sticker system, can be defined: a set of (incomplete) double-stranded sequences (axioms) and a set of pairs of single or double-stranded complementary sequences are given. The initial sequences are prolonged to the left and to the right by using sequences from the latter set, respectively. The iterations of these prolongations produce “computations” of possibly arbitrary length. These processes stop when a complete double stranded sequence is obtained. Sticker systems will generate only regular languages without restrictions. Additional restrictions can be imposed on the matching pairs of strands to obtain more powerful languages. Several types of sticker systems are shown to have the same power as regular grammars; one type is found to represent all linear languages whereas another one is proved to be able to represent any recursively enumerable language. The main aim of this research is to introduce and study sticker systems over monoids in which with each sticker operation, an element of a monoid is associated and a complete double stranded sequence is considered to be valid if the computation of the associated elements of the monoid produces the neutral element. Moreover, the sticker system over monoids is defined in this study.

Research on Temporal Fire Distribution of Shipboard-Gun Neutralization Firing Anti-Shore

In order to satisfy the need of automatic decision-making while shipboard-gun oppressive fire to the shore, This paper research the problem of shipboard-gun temporal fire distribution .This paper put forward the elements of oppressive fire distribution and solve out the calculation of every oppressive fire distribution elements(such as quick-firing’s quantity, surveillance firing’s quantity, every quick-firing’s ammunition wastage, every surveillance firing’s ammunition wastage and firing occasion). It could provide technical support for the realization of automatic decision-making while shipboard-gun suppression firing anti-shore.

Optical manipulation of microobjects using binary diffractive elements

The paper describes the computation of binary diffractive optical elements (DOE) producing specific complex light patterns. The approach is based on amplitude and phase coding methods. The experimental complex light distributions are shown to agree with the computer simulation results. Due to the phase gradient this kind of light beams can be used for moving microscopic particles along a particular path. The light fields like that have been used successfully to trap and move tiny transparent polystyrol spheres 5 micrometer in diameter.

Based on ANASYS with Finite Element Analysis and Calculation of Cracked Pipeline

Pipeline in the entire oil and gas transportation industry play an important role and in the soil is corroded in order to produce the stress corrosion crack. The topic analyzes and calculates cracked pipeline with finite element method by use of ANSYS software mainly, and provides the theory basis for safety evaluation of pipeline.

Distributed generic approximate sparse inverses

The need for accuracy in the solution of linear systems derived from the discretization of partial differential equations leads to large sparse linear systems. The solution of sparse linear systems requires efficient scalable methods. Iterative solvers require efficient parallel preconditioning methods to solve effectively sparse linear systems. Herewith, a new parallel algorithm for the generic approximate sparse inverse matrix method for distributed memory systems is proposed. The computation of the distributed generic approximate sparse inverse matrix is based on a column-wise approach, which allows the separation to independent problems that can be handled in parallel without synchronization points or intermediate communications. This is achieved by reforming the generic approximate sparse inverse matrix algorithm and its process of computation with a new partial solution method for the computation of the nonzero elements of each column dictated by the approximate inverse sparsity pattern. Moreover, an algorithmic scheme is proposed for the efficient distribution of data amongst the available workstations, along with a load balancing scheme for problems with large standard deviation in the number of nonzero elements per column. Numerical results are presented for the proposed schemes for various model problems.

Ball Valve Seat Design Method Based on Finite Element Analysis and Calculation

The face of the valve seat sealing surface design, the finite element analysis and calculation of ball valve seat sealing surface and angle of the design method is studied. Through 3D CAD technology for ball valve design, guide 3D design model to finite element analysis software to calculate ,reveal the sealing load distribution of pressure in the valve seat sealing surface, sealing pressure values are obtained, through the valve seat sealing surface design Angle analysis, to obtain the optimal value of sealing surface angle.

RPV SUSY effects in $\tau^- \to e^-(\mu^-) K\bar{K}$ decays

In this paper, we investigate [Formula: see text] decays in the framework of the RPV SUSY model. We discuss the tree-level contribution of the sparticles [Formula: see text] and [Formula: see text] to these decay branching ratios. In the two channels, the [Formula: see text]-mediated channel is more sensitive to the parameter product [Formula: see text] than the [Formula: see text]-mediated channel to [Formula: see text]. And the parameter product [Formula: see text] is severely constrained to the order of [Formula: see text] by the experiment data with [Formula: see text], which is one order of magnitude more stringent than before. In the calculation of hadronic matrix elements, the resonant effects are large than those of nonresonant terms. Especially, the resonant contribution of scalar meson f(980) plays a dominate role in [Formula: see text]-mediated channel.

Problem of choosing an enterprise resource planning system and methods of its solution

This article presents a new approach to choosing ERP. The need for a special technique is caused by high value of error as a result of high costs of the systems and their strategic importance. This approach uses the modified Analytic Hierarchy Process (AHP) and fuzzy sets theory. Using the expert selection procedures allows to overcome the problem connected with the lack of statistical data from the past implemented projects. Application of the fuzzy assessments helps to solve the problems of ambiguity and subjectivity in construction of the pairwise comparisons matrix. Besides, the simplified procedure for filling the matrix allows the experts to avoid mistakes. It is based on the calculation of the matrix elements using the formulas based on just a few expert opinions. It is based on the calculation of the matrix elements using the formulas based on just a few expert opinions. The selection algorithm takes into account the strategic nature of such projects and allows to decompose the objectives of choice and improve determination of the significant criteria.

Finite Element Analysis of Magnetic Field of Magnetic Sealing Drive Device

Magnetic sealing drive torque is designed and calculated and analyzed, Magnetic circuit and whole structure of the drive are designed, simulating and analyzing to Magnetic circuit of Magnetic sealing drive by ANSYS software, Magnetic field distribution and the effect to torque in model is analyzed and researched. It is shown that the results between theoretical calculation and analysis of the finite element are quite close.

THE COMPLETE, TEMPERATURE RESOLVED EXPERIMENTAL SPECTRUM OF METHANOL (CH3OH) BETWEEN 560 AND 654 GHz

The complete spectrum of methanol (CH{sub 3}OH) has been characterized over a range of astrophysically significant temperatures in the 560.4-654.0 GHz spectral region. Absolute intensity calibration and analysis of 166 experimental spectra recorded over a slow 248-398 K temperature ramp provide a means for the simulation of the complete spectrum of methanol as a function of temperature. These results include contributions from v{sub t} = 3 and other higher states that are difficult to model via quantum mechanical (QM) techniques. They also contain contributions from the {sup 13}C isotopologue in terrestrial abundance. In contrast to our earlier work on semi-rigid species, such as ethyl cyanide and vinyl cyanide, significant intensity differences between these experimental values and those calculated by QM methods were found for many of the lines. Analysis of these differences shows the difficulty of the calculation of dipole matrix elements in the context of the internal rotation of the methanol molecule. These results are used to both provide catalogs in the usual line frequency, linestrength, and lower state energy format, as well as in a frequency point-by-point catalog that is particularly well suited for the characterization of blended lines.

Seepage Analysis of Plane Finite Element on Clay Core Dam of Laojunshan

Through calculation of the seepage finite element, the result shows that the anti-seepage effect of clay core and grouting curtain is obvious. The phreatic line of dam conforms to the general law, and seepage stability of the dam meets the requirements. The sensitivity analysis of the different curtain depth indicate that there is a inflexion on the relation curve of seepage discharge and curtain depth, and to deepen continually the curtain have less effect on the dam seepage discharge when the curtain more than 50m.

Calculation of overall equipment effectiveness weight by Taguchi method with simulation

Overall equipment effectiveness is a comprehensive performance measurement that is used to measure equipment effectiveness on the production line. Overall equipment effectiveness is a key performance indicator to measure the implementation of total productive maintenance. Nevertheless, as the time passes, the usage of overall equipment effectiveness is transformed to a system that analyses production data, to identify potential areas of improvement and support lean initiatives. Therefore, overall equipment effectiveness characteristically advances from being a base measure of efficiency as its initial purpose, to being a tool that improves effectiveness. Even though overall equipment effectiveness appears to be a complete performance measurement indicator, it still requires proper modification. Many researches related to overall equipment effectiveness improvement have used weighted overall equipment effectiveness to advance this performance measurement for production line use. Until now, only a few researches have been conducted by other researchers related to overall equipment effectiveness improvement. Several overall equipment effectiveness improvements have included the cost variable into the overall equipment effectiveness calculation; others have attempted to develop a new technique to set up the weights of overall equipment effectiveness. Since several researches of overall equipment effectiveness improvement have met with difficulty when determining the proper weight for each overall equipment effectiveness element, this research proposes a new procedure to cover this drawback. The baseline for weighting overall equipment effectiveness elements in this research refers to overall equipment effectiveness element characteristics that are obtained by a combined result of simulation and experiment, through the Taguchi method. The research outcome proves that this combination of methods gives a more accurate result for providing characteristic data of a production line related to overall equipment effectiveness and for obtaining a weight calculation of overall equipment effectiveness elements.

Turbine Rotor Tooth Head and Stress Analysis of Wedge

The turbine generator rotor and the wedge is an important part of the turbogenerator. In order to ensure the stability and reliability of the steam turbine during operation, it needs to calculate and analyze the strength of the generator rotor and the wedge. In this paper, we did the study of the turbine generator rotor and the strength of the wedge by finite element analysis. by using ANSYS software, when in operating speed and speeding, we compared to the results of the calculation of plane and solid elements, and found that the safety factor of the plane was lower. Based on the results of two calculations, we got the generator rotor structure modification and optimization of the structural design, which improve the strength of the generator rotor tooth head and wedge.

The Research on Cable Force Measurement Based on Degenerated Element with Frequency Method

At present, among the methods of cable force measurement, the frequency method is applied extensively for its mature theory and rapid and repeated operation procedure. Based on the theory of frequency method measurement, it generally uses the numerical method with beam element to analysis the parameters of cables under the given conditions. However, the conventional beam element is not able to simulate the bending stiffness in beams section. Therefore, it turns to degenerated beam element to simulate cables and the results agree well with the results based on beam element and formulas calculation, and it provides theoretical basis for the later cable force testing system.

Analysis of the Mechanical Properties of Cement Silo Structure

Cement silo belonging to special structure, widely used in the cement industry, cement production is essential in the process of building. With the development of society, advances in industrial, cement silo construction have been expanding. This is an update to a cement silo structure, using finite element analysis, calculation and analysis in the context of full and half given mechanical properties, with ANSYS simulation modeling in order to get weak cement silo structure location, and design improvements for the weak position.

Numerical Simulation Analysis on Interaction among Underground Structure, Shear Connectors and Retaining Piles

The method of retaining piles working as an anti-floating piles has advantages of lesser environmental impact, high utilization of resources and good in economic benefits, but the method effecting on underground structure was worthy of further study and exploitation. According to the practical underground projects, this paper has proposed three possible connections between underground structure, shear connectors and retaining piles. The analysis showed that the internal force and displacement of underground structural is affected distinctly by the method. In addition, characters and applicable ranges of the three different connections is introduced with the finite element analysis and calculation of stress and displacement of the main parts like base plate ,top plate ,and so on.