Geotechnical engineers need to study soil properties by conducting a number of field and laboratory tests. Processing geotechnical engineering laboratory test data is laborious and takes considerable time when doing i...
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Geotechnical engineers need to study soil properties by conducting a number of field and laboratory tests. Processing geotechnical engineering laboratory test data is laborious and takes considerable time when doing it manually. The present paper explains the need of a computer package to process geotechnical engineering laboratory data and the details of a computer program which is being developed for this use. The different stages of the program are explained with the laboratory tests considered with the help of flow charts. The use of the program is illustrated with an example. Possible improvements to the program are proposed.
A detailed assessment of the frequency-domain approach normally used for evaluation of convertor harmonics is presented, limitations and inaccuracies are identified, and the need for an improved method is established....
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A detailed assessment of the frequency-domain approach normally used for evaluation of convertor harmonics is presented, limitations and inaccuracies are identified, and the need for an improved method is established. The theoretical basis of a new method, which simulates the individual switching processes within each convertor, is described. The method uses a modified state-variable approach to automatically formulate the 3-phase network equations, which are then linked with the convertor equations to give a time-domain solution. The computer program developed is capable of analysing power systems with interconnected components of any desired configuration, and the simultaneous operation of several convertor loads may be studied. When the time-domain solution reaches a periodic condition, the harmonic components are evaluated using a special-purpose Fourier-analysis program. The computed results of selected cases are presented to demonstrate the inherent accuracy of the method and to show its potential usefulness for other applications
The sequence-specific assignment of resonances is still the most time-consuming procedure that is necessary as the first step in high-resolution NMR studies of proteins. In many cases a reliable three-dimensional (3D)...
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The sequence-specific assignment of resonances is still the most time-consuming procedure that is necessary as the first step in high-resolution NMR studies of proteins. In many cases a reliable three-dimensional (3D) structure of the protein is available, for example, from X-ray spectroscopy or homology modeling. Here we introduce the st2nmr program that uses the 3D structure and Nuclear Overhauser Effect spectroscopy (NOESY) peak list(s) to evaluate and optimize trial sequence-specific assignments of spin systems derived from correlation spectra to residues of the protein. A distance-dependent target function that scores trial assignments based on the presence of expected NOESY crosspeaks is optimized in a Monte Carlo fashion. The performance of the program st2nmr is tested on real NMR data of an alpha-helical (cytochrome c) and beta-sheet (lipocalin) protein using homology models and/or X-ray structures;it succeeded in completely reproducing the correct sequence-specific assignments in most cases using 2D and/or N-15/C-13 Nuclear Overhauser Effect (NOE) data. Additionally to amino acid residues the program can also handle ligands that are bound to the protein, such as heme, and can be used as a complementary tool to fully automated assignment procedures.(C) 2002 John Wiley Sons, Inc.
The analysis and optimal design of a microstrip sensor for measuring the water content of rubber latex is described. The microstrip structure consists of three layers: substrate, protective layer and semi-infinite lay...
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The analysis and optimal design of a microstrip sensor for measuring the water content of rubber latex is described. The microstrip structure consists of three layers: substrate, protective layer and semi-infinite layer of wet medium. A functional relationship has been developed between the attenuation and the water content of the latex, and close agreement has been found between the computed and experimental results. A computer program has also been developed which optimises the sensitivity for a given water content.
An efficient numerical approach, based on the boundary element method, for the analysis of electromagnetic field distributions in twodimensional tunnels with discontinuities such as L-bends, T-junctions, and cross-jun...
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An efficient numerical approach, based on the boundary element method, for the analysis of electromagnetic field distributions in twodimensional tunnels with discontinuities such as L-bends, T-junctions, and cross-junctions is described. The side walls of the tunnels are assumed to be lossy dielectric and the surface impedance approximation is used to determine the boundary condition on the side walls. A computer program has been developed for tunnels excited by a line current or a TE dominant mode. A comparison of the numerical results with the experimental results using microwave simulation shows a good agreement except in the vicinity of the inner wall of the output tunnel perpendicular to the excited tunnel.
Many observations in the biological field can adequately be fitted to an exponential regression equation, commonly in the form y = alpha + beta e(gamma x). However, the exact confidential limits of the parameters rema...
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Many observations in the biological field can adequately be fitted to an exponential regression equation, commonly in the form y = alpha + beta e(gamma x). However, the exact confidential limits of the parameters remain a problem. An algorithm to solve this problem is proposed here and tested with experimental data obtained from ventricular pressure measurements in isolated working small animal hearts. A subroutine based on this algorithm is written in Borland's Turbo-Pascal but easily portable to other languages. (C) 1997 Elsevier Science Ireland Ltd.
A suite of geological computer programs written in Mathematica is currently available both within the online repository for the Journal of Structural Geology as well as on the first author's website (http://***/us...
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A suite of geological computer programs written in Mathematica is currently available both within the online repository for the Journal of Structural Geology as well as on the first author's website (http://***/users/m/mookerje/***). The majority of these programs focus on three-dimensional strain analysis (e.g., determining best-fit strain ellipsoids, plotting elliptical data on either a Flinn or Hsu diagram, and determining error bounds for three-dimensional strain data). This program suite also includes a ternary diagram plotting program, a rose diagram program, an equal area and equal angle projections program, and an instructional program for creating two-dimensional strain path animations. The bulk of this paper focuses on a new method for determining a best-fit ellipsoid from arbitrarily oriented sectional ellipses and methods for determining appropriate error bounds for strain parameters and orientation data. This best-fit ellipsoid method utilizes a least-squares approach and minimizes the error associated with the two-dimensional data-ellipse matrix elements with the corresponding matrix elements from sectional ellipses through a general ellipsoid. Furthermore, a kernel density estimator is utilized to yield reliable error margins for the strain parameters, octahedral shear strain. Flinn's k-value, and Lode's ratio. By assuming a gamma distribution for the simulated principal axes orientations, more realistic error bounds can be estimated for these axes orientations. (C) 2011 Elsevier Ltd. All rights reserved.
A FORTRAN computer program is presented for the reduction to a lipoprotein size distribution of data from the analytical ultracentrifugal analysis of total low density lipoproteins at a density of 1·0.63 g/ml. It...
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A FORTRAN computer program is presented for the reduction to a lipoprotein size distribution of data from the analytical ultracentrifugal analysis of total low density lipoproteins at a density of 1·0.63 g/ml. It is a simple but versatile program using schlieren photographs reduced to x and y co-ordinates as the input. The program accommodates different rotor speeds, temperatures and background solution viscosities, and will accept up to five photographs taken at any time before or after the rotor has reached full speed. Output consists of a lipoprotein diameter distribution and a graph with log (Sf+5) as x-axis. Lipoprotein concentrations are also calculated.
We describe the Snob program for unsupervised learning as it has evolved from its beginning in the 1960s until its present form. Snob uses the minimum message length principle expounded in Wallace and Freeman (Wallace...
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We describe the Snob program for unsupervised learning as it has evolved from its beginning in the 1960s until its present form. Snob uses the minimum message length principle expounded in Wallace and Freeman (Wallace, C.S. and Freeman, P.R. (1987) Estimation and inference by Compact coding. J. Roy. Statist. Soc. Ser. B, 49, 240-252.) and we indicate how Snob estimates class parameters using the approach of that paper. We will survey the evolution of Snob from these beginnings to the state that it has reached as described by Wallace and Dowe (Wallace, C.S. and Dowe, D.L. (2000) MMM mixture modelling of multi-state, Poisson, Von Mises Circular and Gaussian distributions. Stat. Comput., 10, 73-83.) We pay particular attention to the revision of Snob in the 1980s where definite assignment of things to classes was abandoned.
This paper presents a software package developed to assess the economic profitability of an original way to produce renewable energy: the small scale gasification of willow cultivated as short rotation coppice (SRC) i...
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This paper presents a software package developed to assess the economic profitability of an original way to produce renewable energy: the small scale gasification of willow cultivated as short rotation coppice (SRC) in Belgium. The theoretical bases of the model (process hypotheses and economic indicators) are firstly presented together with the most relevant characteristics of the energy production route (SRC management and wood production, storage and conversion). A reference case is then defined which combines the most influencing parameters (reference interest rate, rotation length, subsidies, harvest mode, SRC yield, power of the electricity generator and annual production of electricity). A sensitivity analysis on these parameters highlighted that the project profitability, from the net present value point of view, is very sensitive to the reference interest rate, to the subsidies (of the conversion unit but probably also of any other kind of subsidies), to the SRC yield and to the generator power, all other parameters remaining constant. The rotation length has only a low influence, at least in the range of classic values (3 to 7 years). To harvest the wood in stems (with delayed chipping) seems also to be the most interesting option. (C) 2000 Elsevier Science Ltd. All rights reserved.
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