A numerical model, in the form of a computer program, for tracing the behaviour of high performance concrete (HPC) columns exposed to fire is presented. The three stages, associated with the thermal and structural ana...
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A numerical model, in the form of a computer program, for tracing the behaviour of high performance concrete (HPC) columns exposed to fire is presented. The three stages, associated with the thermal and structural analysis, for the calculation of fire resistance of columns are explained. A simplified approach is proposed to account for spalling under fire conditions. The use of the computer program for tracing the response of an HPC column from the initial pre-loading stage to collapse, due to fire, is demonstrated. The validity of the numerical model used in the program is established by comparing the predictions from the computer program with results from full-scale fire resistance tests. Details of fire resistance experiments carried out on HPC columns, together with results, are presented. The computer program can be used to predict the fire resistance of HPC columns for any value of the significant parameters, such as load, section dimensions, fiber reinforcement, column length, concrete strength, aggregate type, and fiber reinforcement. (C) 2003 Elsevier Ltd. All rights reserved.
Predicting crystal habits under the influence of additives by means of molecular modeling software (e.g., Cerius(2)) requires additionally models in order to find the final crystal habit. Here, Periodic Bond Chains (P...
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Predicting crystal habits under the influence of additives by means of molecular modeling software (e.g., Cerius(2)) requires additionally models in order to find the final crystal habit. Here, Periodic Bond Chains (PBC-vectors), are used to improve the results of one of these model approaches, the build-in approach [1,2]. The build-in approach does not always produce the desired results. A computer program was developed to find the PBCs and to investigate their changes as a result of the presence of additives. This approach is verified using the examples of benzophenone with different additives. Furthermore, the results are discussed and problems are highlighted.
Industrial processes are naturally multivariable in nature. A comparison of multivariable decentralized controllers has been performed and a multivariable four interconnected water tank system, which exhibits a RHP (R...
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Industrial processes are naturally multivariable in nature. A comparison of multivariable decentralized controllers has been performed and a multivariable four interconnected water tank system, which exhibits a RHP (Right Half Plane) zero is considered for decentralized control. The characteristics of a four-tank system are discussed and a decentralized PI (Proportional-Integral) controller is designed for the system based on various control algorithms. The algorithms are simulated using MATLAB and the performances are compared for reference tracking, disturbance rejection and model uncertainty cases. The comparison of the results show that the controllers based on Gershgorin band and Ideal relay method are suitable for the control of a four-tank system.
A computer program for advanced heart rate variability (HRV) analysis is presented. The program calculates all the commonly used time- and frequency-domain measures of HRV as well as the nonlinear Poincare plot. In fr...
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A computer program for advanced heart rate variability (HRV) analysis is presented. The program calculates all the commonly used time- and frequency-domain measures of HRV as well as the nonlinear Poincare plot. In frequency-domain analysis parametric and nonparametric spectrum estimates are calculated. The program generates an informative printable report sheet which can be exported to various file formats including the portable document format (PDF). Results can also be saved as an ASCII file from which they can be imported to a spreadsheet program such as the Microsoft(R) Excel(R). Together with a modern heart rate monitor capable of recording RR intervals this freely distributed program forms a complete tow-cost HRV measuring and analysis system. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
The article describes a Windows program to estimate the expected value and sampling distribution function of the adverse impact ratio for general multistage selections. The results of the program can also be used to p...
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The article describes a Windows program to estimate the expected value and sampling distribution function of the adverse impact ratio for general multistage selections. The results of the program can also be used to predict the risk that a future selection decision will result in an outcome that reflects the presence of adverse impact. The method therefore provides the selection practitioner with a valuable tool to screen intended selection scenarios in terms of their potential to address the adverse impact problem.
1. Resolving conicts 87 2. Logic with visualization 88 3. Birth of heterogeneous logic 92 3.1. Enlarging the audience 94 3.2. Applying the ideas 95 3.3. Laying out a mathematical framework 97 4. Case study for heterog...
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1. Resolving conicts 87 2. Logic with visualization 88 3. Birth of heterogeneous logic 92 3.1. Enlarging the audience 94 3.2. Applying the ideas 95 3.3. Laying out a mathematical framework 97 4. Case study for heterogeneity 101 5. Interdisciplinary research 104
MOP-UP is a web-based application that enables efficient searching of nucleic acid or amino-acid alignments for sequences or motifs that are unique to a subset of the members represented in the alignment. This has app...
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MOP-UP is a web-based application that enables efficient searching of nucleic acid or amino-acid alignments for sequences or motifs that are unique to a subset of the members represented in the alignment. This has applications in the design of assays that aim to detect particular strains or species. Since molecular-based characterisation of microbes is becoming increasingly important, MOP-UP can aid microbiologists in finding the best loci on which to base such assays. The program is accessible at: http://***/srmd/bioinformatics/tools/***.
Purpose: The idea for this project was born by the necessity to offer medical students an easy approach to the theoretical basics of magnetic resonance imaging. The aim was to simulate the features and functions of su...
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Purpose: The idea for this project was born by the necessity to offer medical students an easy approach to the theoretical basics of magnetic resonance imaging. The aim was to simulate the features and functions of such a scanner on a commercially available computer by means of a computer program. Materials and Methods: The simulation was programmed in pure Java under the GNU General Public License and is freely available for a commercially available computer with Windows, Macintosh or Linux operating system. The graphic user interface is oriented to a real scanner. In an external program parameter, images for the proton density and the relaxation times T1 and T2 are calculated on the basis of clinical examinations. From this, the image calculation is carried out in the simulation program pixel by pixel on the basis of a pulse sequence chosen and modified by the user. The images can be stored and printed. In addition, it is possible to display and modify k-space images. Results: Seven classes of pulse sequences are implemented and up to 14 relevant sequence parameters, such as repetition time and echo time, can be altered. Aliasing and motion artifacts can be simulated. As the image calculation only takes a few seconds, interactive working is possible. Conclusion: The simulation has been used in the university education for more than 1 year, successfully illustrating the dependence of the MR images on the measuring parameters. This should facititate the approach of students to the understanding MR imaging in the future.
Corrosion and/or aggression are common problems arising in pipelines transporting terrestrial waters. The kinetics and severity of such events depend on both the quality of the water being transported and the material...
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Corrosion and/or aggression are common problems arising in pipelines transporting terrestrial waters. The kinetics and severity of such events depend on both the quality of the water being transported and the material properties of the pipeline. Irrespective of the nature of the problem, its solution (or at least its minimisation) is strongly linked to control of pH, calcium concentration and carbonate chemistry of the water (stabilisation). However, application of such chemistry to water treatment problems is complex and time consuming. Various numerical, graphical and computer techniques have been developed to address this, but these are either of insufficient accuracy, too time consuming or lacking in generality. In this paper algorithms are presented for solving a broad spectrum of problems related to control of mineral precipitation/aggression, pH and chemical dosing in water treatment. These have been incorporated into a computer software package, STASOFT, which offers the requisite framework for use in water treatment. Various stabilisation problems pertinent to water supply are addressed.
The Ice Progressive Stress (IPS) method fulfils international requirements and has been included by IEEE in the Position Paper of accepted ice test procedures [2]. The present paper analyses the repeatability of the t...
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ISBN:
(纸本)0780384474
The Ice Progressive Stress (IPS) method fulfils international requirements and has been included by IEEE in the Position Paper of accepted ice test procedures [2]. The present paper analyses the repeatability of the test results of 400 kV voltage class line cap-and-pin/long rod insulators and circuit breakers. The results of the tests of nine different types of full-scale insulator strings and three different types of full-scale T-formed circuit breakers are analyzed. The analysis of the repeatability showed that the results are repeatable in terms of the variation of the different test parameters. The statistical test results in the form of 50% flashover voltage and standard deviation are completely applicable for the statistical dimensioning (availability calculations) using specially developed computer program. Examples are presented in the paper.
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