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A program FOR THE COMPUTATION OF POWER AND DETERMINATION OF SAMPLE-SIZE IN HIERARCHICAL EXPERIMENTAL-DESIGNS

computer METHODS AND programS IN BIOMEDICINE 1989年第3期29卷 179-190页

作者： JEANPRETRE, N KRAFTSIK, R UNIV LAUSANNE INST ANAT RUE BUGNON 9 CH-1005 LAUSANNE SWITZERLAND

We have devised a program that allows computation of the power of F-test, and hence determination of appropriate sample and subsample sizes, in the context of the one-way hierarchical analysis of variance with fixed effects. The power at a fixed alternative is an increasing function of the sample size and of the subsample size. The program makes it easy to obtain the power of F-test for a range of values of sample and subsample sizes, and therefore the appropriate sizes based on a desired power. The program can be used for the ''ordinary'' case of the one-way analysis of variance, as well as for hierarchical analysis of variance with two stages of sampling. Examples are given of the practical use of the program.

关键词： Power Sample size Hierarchical analysis of variance computer program Two-stage sampling

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The application of an empirical design model in the development of facultative pond design criteria for Turkey

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ENVIRONMENTAL TECHNOLOGY 2000年第12期21卷 1363-1369页

作者： Gulsen, H Turan, M Altay, A Istanbul Tech Univ Fac Civil Engn Dept Environm Engn TR-80626 Istanbul Turkey

The wastewater treatment systems of a city in Turkey differ from each other depending on various factors such as population, economy, wastewater characteristics, topography, climatic conditions, urbanisation and cost of land. The construction and operation of the stabilisation ponds in all cities of Turkey are very easy due to the cheaper cost of the land and hot and mild climates. In this study, a computer model based on the Wehner-Wilhelm equation, developed by Thirumurthi, is used and for this application;first-order reaction rate (k(p)) and dimensionless dispersion coefficient (D) must be determined. Also, some parameters such as temperature, solar radiation, organic loading, altitude, turbidity. and hydraulic retention time are also required. The BOD, removal in the winter for 2m of pond depth was found 50%, and 52%, in the southern region (Sanliurfa), the northern region (Samsun), and the western region (Balikesir), respectively. No result could be given for the eastern region (Erzurum) in Winter, since wastewater in the pond was frozen. Generally, the BOD, removal was found to be 90-92% in the Summer for all provinces, and also 55-70% in the southern region, and 40-55% in the northern region in Winter during the 20 days of retention time when dimensionless dispersion coefficient and oxygenation factor are 0.2 and 1.5, respectively. The optimum effluent quality of the pond was obtained as 15-25 days of the retention time, 1-2 m of pond depth, and 0.2 dimensionless dispersion coefficient.

关键词： facultative pond retention time pond depth BOD5 removal computer program

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HITRAN 2012 refractive indices

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JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2013年 130卷 373-380页

作者： Massie, S. T. Hervig, M. Natl Ctr Atmospher Res Boulder CO 80307 USA GATS Inc Driggs ID 83422 USA

The HITRAN 2012 compilation of the real and imaginary refractive indices of the materials in aerosols and cloud particles is reviewed. Additions to HITRAN 2012 focus upon materials that are absorptive (i.e. minerals, burning vegetation, brown carbon, desert dust, and volcanic ash). The HITRAN-RI program, created to facilitate usage of the indices, is discussed. The HITRAN-RI program inter-compares the indices of different data sets and calculates optical properties (i.e. extinction, scattering, absorption, single scattering albedo, backscattering, and asymmetry parameter) for user specified size distributions and particle types. The instructional component of HITRAN-RI introduces the user to Mie calculations for spheres and coated spheres, and applies various mixing rules by which one calculates the effective indices of a multi-component particle. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Refractive indices Absorptive indices computer program

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HEATING IN TRANSFORMER CORES DUE TO RADIAL LEAKAGE-FLUX .2. COMPUTED RESULTS

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1977年第12期124卷 1181-1186页

作者： CARPENTER, CJ SHARPLES, KO DJUROVIC, M CITY UNIV LONDON DEPT ELECT ENGN LONDON EC1V 4PB ENGLAND ELEKTROTEHNICKI FAK TITOGRAD YUGOSLAVIA

The experimental loss and flux-density distributions, given in the companion paper for two full-scale transformer core-leg models, are compared with theoretical results obtained by computer. The computer program provides a 3-dimensional solution of the leakage flux distribution, both outside and inside the core. The flux penetration into the core leg is calculated using an anisotropic-core model, which gives the loss distribution due to the currents induced in the laminations. The predicted and measured flux-density distributions are in good agreement. Predicted loss distributions are consistent with those obtained from rates of rise of temperature, but measurement difficulties limit the accuracy of the comparison.

关键词： loss distribution radial leakage flux heating power transformers Transformers and reactors electrical engineering computing laminations magnetic leakage transformer cores Power engineering computing leakage flux distribution computer program flux penetration

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A design procedure for vegetative filter strips using VFSMOD-W

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TRANSACTIONS OF THE ASAE 2004年第6期47卷 1933-1941页

作者： Muñoz-Carpena, R Parsons, JE Univ Florida Dept Agr & Biol Engn IFAS TREC Homestead FL 33031 USA N Carolina State Univ Dept Biol & Agr Engn Raleigh NC 27695 USA

Although vegetative filter strips (VFS) are a common BMP used for runoff sediment control, there is currently no widely accepted objective design criteria available to select optimal construction characteristics (filter length, width, slope, vegetation) needed to achieve a desired sediment reduction. A design procedure for VFS using VFSMOD- W is presented. VFSMOD, the main component of VFSMOD-W is afield-scale, mechanistic, storm-based model developed to route the incoming hydrograph and sedigraph from an adjacent field through a VFS and to calculate the resulting outflow, infiltration, and sediment trapping efficiency. A front-end model, UH, was developed and added to VFSMOD-W to generate the necessary source area design inputs for VFSMOD. For each design storm, UH generates a rainfall hyetograph, a runoff hydrograph, and sediment loss from the source area using a combination of the NRCS curve number method, the unit hydrograph, and the modified Universal Soil Loss Equation based on topography, land use, and soil type. With these inputs, a set of response curves, i.e., sediment and runoff reduction vs. filter construction characteristics, can be developed from VFSMOD-W outputs for a given design scenario. To illustrate this procedure, a design case was presented where the goal was to obtain a 75% runoff sediment reduction for conditions similar to those of the North Carolina Piedmont region. In addition to two soil types present in the area, the range of conditions used in the analysis included two design alternatives (one concentrating field runoff in a narrower filter), four design storms with 1 to 10 year return periods, and buffer lengths ranging from 1 to 100 m. For the range of design storms considered, the optimal filter lengths obtained were 1 to 4 m for the sandy clay soil and 8 to 44 m for the clay. The results show that in some cases current environmental regulations pertaining to filter lengths in the area will not be sufficient. This application case c

关键词： computer program hydrology design modeling sediment TMDL vegetative filter strips VFSMOD water quality

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ECOLOG-II - A REAL-TIME ACOUSTIC-SIGNAL PROCESSING SYSTEM FOR FISH STOCK ASSESSMENT

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ULTRASONICS 1990年第4期28卷 256-265页

作者： STEPNOWSKI, A MITCHELL, RS Seastar Instruments Ltd Argo Building Bedford Institute of Oceanography Dartmouth Nova Scotia Canada B2Y 3Y9

A new real-time signal processing sonar system (ECOLOG II) has been developed. Even though the system is compact it is capable of performing in real time all basic functions required for acoustic fisheries stock assessment, including simultaneous echo integration and target strength estimation. The system incorporates a precision echo sounder and a powerful internal processor connected to a host personal computer workstation. The system is flexible so that the same hardware may be used for various operating modes. All user control and operation of the sounder/processor is done with the host workstation. The workstation also provides post processing, data storage and various graphics presentation of output data.

关键词： acoustic signal processing computer program stock assessment

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Modular simulation of fluidized bed reactors

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CHEMICAL ENGINEERING & TECHNOLOGY 2004年第2期27卷 123-129页

作者： Jafari, R Sotudeh-Gharebagh, R Mostoufi, N Univ Tehran Dept Chem Engn Proc Design & Simulat Res Ctr Fac Engn Tehran Iran

Simulation of chemical processes involving nonideal reactors is essential for process design, optimization, control and scale-up. Various industrial process simulation programs are available for chemical process simulation. Most of these programs are being developed based on the sequential modular approach. They contain only standard ideal reactors but provide no module for nonideal reactors, e.g., fluidized bed reactors. In this study, a new model is developed for the simulation of fluidized bed reactors by sequential modular approach. In the proposed model the bed is divided into several serial sections and the flow of the gas is considered as plug flow through the bubbles and perfectly mixed through the emulsion phase. In order to simulate the performance of these reactors, the hydrodynamic and reaction submodels should be integrated together in the medium and facilities provided by industrial simulators to obtain a simulation model. The performance of the proposed simulation model is tested against the experimental data reported in the literature for various gas-solid systems and a wide range of superficial gas velocities. It is shown that this model provides acceptable results in predicting the performance of the fluidized bed reactors. The results of this study can easily be used by industrial simulators to enhance their abilities to simulate the fluidized bed reactor properly.

关键词： computer program Reactors, Fluidized bed Simulation

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Evaluation of absorption cycles with respect to COP and economics

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INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 1996年第1期19卷 19-24页

作者： Summerer, F Technische Universität München Physik Department Institut E19 James-Franck-Straße 1 85748 Garching Germany

The calculation of the performance of absorption heat pump cycles or the comparison of different types of machine cannot be done in a reasonable way without considering the first cost of the machine and especially the cost of the heat exchangers, as their area and particularly the distribution of the area between the respective components of the heat pump determine the COP. Therefore it makes sense only to compare machines that are optimized in this respect. A good way to evaluate cycles is to calculate the maximum COP in terms of the total cost of the heat exchangers. For that purpose a computer program was developed for different absorption heat pump cycles with water as refrigerant. The calculation method is simple and thus the result reliable. The program is suitable for evaluating double-lift, single-, double- and some triple-effect cycles, each one with different absorption fluids and with different options, such as different solution flows (parallel, serial), different types of absorber (spray- or falling-film absorber), and different types of generator (pool- or falling-film generator). With this instrument different cycles or similar cycles with different features can be compared. An economically significant estimation of the performance of a cycle working under defined conditions is possible.

关键词： absorption cycles performance economy evaluation computer program

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Determination of interfacial tension from the profile of a pendant drop using computer-aided image processing .2. Experimental

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JOURNAL OF COLLOID AND INTERFACE SCIENCE 1996年第1期184卷 77-91页

作者： Song, BH Springer, J TECH UNIV BERLIN INST CHEM TECHFACHGEBIET MAKROMOL CHEMD-10623 BERLINGERMANY

The reliability of the method described in the preceding paper (B. Song and J. Springer, J, Colloid Interface Sci. 183, in press, 1996) for the determination of surface and interfacial tension (IFT) of liquid-fluid systems from the profile of a pendant drop has been studied experimentally, Influences on the resultant IFT values from factors such as the location of the drop profile and illumination conditions are considered, The reproducibility and accuracy of the measurement method were examined by measuring the time dependence of polyethylene glycol (PEG600)/air and water/air systems and by determining the temperature dependence of the polyethylene glycol (PEG6000)/N-2 and LD (low-density) polyethylene/N-2 systems, The effect of drop vibrations on the accuracy of the method is discussed. (C) 1996 Academic Press, Inc.

关键词： pendant-drop method surface tension, interfacial tension time and temperature dependence of interfacial tension profile detection and optimization error analysis computer program

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TGSA-flex:: Extending the capabilities of the topo-geometrical superposition algorithm to handle flexible molecules

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JOURNAL OF COMPUTATIONAL CHEMISTRY 2004年第2期25卷 153-159页

作者： Gironés, X Carbó-Dorca, R Univ Girona Inst Computat Chem Girona 17071 Spain

In this work, an extension of the already studied Topo-Geometrical Superposition Approach (TGSA) is presented. TGSA, a general-purpose, fast, automatic, and, user-intuitive, three-dimensional molecular alignment procedure, was originally designed to superpose rigid molecules simply based on atomic numbers, molecular coordinates, and connectivity. The algorithm is further developed to enable handling rotations around single bonds;in this way, common structural features, which were not properly aligned due to conformational causes, can be brought together, thus improving the molecular similarity picture of the final alignment. The Present procedure, implemented in Fortran 90 and named TGSA-Flex, is deeply detailed and tested over four molecular sets: amino acids, nordihydroguaiaretic acid (NDGA) derivatives, HIV-1 protease inhibitors, and 1-[2-hydroxyethoxy methyl]-6-(phenylthio)thymine (HEPT) derivatives. TGSA-Flex performance is evaluated by means of computational time, number of superposed atoms (also comparing it with respect to the rigid approach), and index of fit between the compared structures.

关键词： molecular superposition flexible alignment flexibility rotary bonds Topo-Geometrical Approach TGSA computer program

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