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Author : Marc Nerlove
Publisher : Unknown
Page : 130 pages
File Size : 53,9 Mb
Release : 1958
Category : Agricultural industries
ISBN : UIUC:30112019251187
Author : N. MacDonald
Publisher : Springer Science & Business Media
Page : 122 pages
File Size : 43,9 Mb
Release : 2013-03-08
Category : Mathematics
ISBN : 9783642931079
In many biological models it is necessary to allow the rates of change of the variables to depend on the past history, rather than only the current values, of the variables. The models may require discrete lags, with the use of delay-differential equations, or distributed lags, with the use of integro-differential equations. In these lecture notes I discuss the reasons for including lags, especially distributed lags, in biological models. These reasons may be inherent in the system studied, or may be the result of simplifying assumptions made in the model used. I examine some of the techniques available for studying the solution of the equations. A large proportion of the material presented relates to a special method that can be applied to a particular class of distributed lags. This method uses an extended set of ordinary differential equations. I examine the local stability of equilibrium points, and the existence and frequency of periodic solutions. I discuss the qualitative effects of lags, and how these differ according to the choice of discrete or distributed lag. The models studied are drawn from the population dynamiCS of single species (logistic growth, the chemostat) and of interacting pairs of species (predation, mutualism), from cell population dynamiCS (haemopoiesis) and from biochemical kinetics (the Goodwin oscillator). The last chapter is devoted to a population model employing difference equations. All these models include non-linear terms.
Author : Mr.Nurun N. Choudhry
Publisher : International Monetary Fund
Page : 22 pages
File Size : 51,9 Mb
Release : 1991-04-01
Category : Business & Economics
ISBN : 9781451976373
The paper provides empirical evidence on collection lags in major categories of government revenue and analyzes the estimated revenue-eroding effects of inflation within the standard model of inflationary finance. The evidence indicates a wide variation in collection lags among the categories of revenues. The estimated erosion of real fiscal revenue, although varied in the sample countries, appears to have substantially offset gains from the inflation tax, thereby severely restricting the use of this form of taxation in generating resources.
Author : Herschel Wray Little,Albert Leonard Meyers,United States. Bureau of Agricultural Economics
Publisher : Unknown
Page : 34 pages
File Size : 50,7 Mb
Release : 1943
Category : Agricultural prices
ISBN : CORNELL:31924013839638
Author : Anonim
Publisher : Unknown
Page : 128 pages
File Size : 42,6 Mb
Release : 2024-07-04
Category : Electronic
ISBN : 9789814477345
Author : Charles E. Shepard,Isidore Warshawsky
Publisher : Unknown
Page : 740 pages
File Size : 51,9 Mb
Release : 1952
Category : Amplifiers (Electronics)
ISBN : STANFORD:36105024831385
Basic electrical networks are described that compensate for the thermal time lag of thermocouple and resistance thermometer elements. For a given set of operating conditions, networks requiring no amplifiers can provide a thirtyfold reduction in effective time lag. This improvement is obtained without attenuation of the voltage signal, but does result in a large reduction in the amount of electric power available because of an increase in the output impedance of the network. Networks used commercially available amplifiers can provide a thousandfold reduction in the effective time lag without attenuation of the alternating voltage signal or or the available electric power, but the improvement is often obtained at the expense of loss of the zero-frequency signal. The completeness of compensation is limited by the extent of off-design operation required.
Author : United States. Congress. House. Committee on Agriculture. Subcommittee on Domestic Marketing and Consumer Relations
Publisher : Unknown
Page : 24 pages
File Size : 43,8 Mb
Release : 1975
Category : Agricultural prices
ISBN : UOM:39015078590307
Author : Anonim
Publisher : Stanford University
Page : 129 pages
File Size : 40,6 Mb
Release : 2024-07-04
Category : Electronic
ISBN : 8210379456XXX
Author : Ordway B. Gates,Albert A. Schy
Publisher : Unknown
Page : 46 pages
File Size : 46,6 Mb
Release : 1951
Category : Airplanes
ISBN : UOM:39015086495192
A method is presented for determining the control gearing and time lag necessary for determining a specified damping of the motions of an aircraft equipped with an autopilot having a constant-time-lag characteristics. The method is applied to a typical present-day airplane equipped with an autopilot sensitive to yawing acceleration. The types of motion predicted for this airplane-autopilot system by this method are compared with motions calculated by a step-by-step procedure.
Author : Og?uzto?reli
Publisher : Academic Press
Page : 320 pages
File Size : 53,8 Mb
Release : 1966-01-01
Category : Computers
ISBN : 9780080955308
Time-Lag Control Systems
Author : James L. Adams
Publisher : Unknown
Page : 84 pages
File Size : 43,8 Mb
Release : 1962
Category : Electronics
ISBN : UIUC:30112106636902
Author : United States. Patent Office
Publisher : Unknown
Page : 1360 pages
File Size : 46,8 Mb
Release : 1877
Category : Electronic
ISBN : UCAL:C2539705
Author : Anonim
Publisher : Unknown
Page : 556 pages
File Size : 53,9 Mb
Release : 2024-07-04
Category : Electronic
ISBN : DMM:057001323474
Author : Michael J. Pyrcz,Clayton V. Deutsch
Publisher : Oxford University Press
Page : 449 pages
File Size : 50,5 Mb
Release : 2014-04-16
Category : Mathematics
ISBN : 9780199358830
Published in 2002, the first edition of Geostatistical Reservoir Modeling brought the practice of petroleum geostatistics into a coherent framework, focusing on tools, techniques, examples, and guidance. It emphasized the interaction between geophysicists, geologists, and engineers, and was received well by professionals, academics, and both graduate and undergraduate students. In this revised second edition, Deutsch collaborates with co-author Michael Pyrcz to provide an expanded (in coverage and format), full color illustrated, more comprehensive treatment of the subject with a full update on the latest tools, methods, practice, and research in the field of petroleum Geostatistics. Key geostatistical concepts such as integration of geologic data and concepts, scale considerations, and uncertainty models receive greater attention, and new comprehensive sections are provided on preliminary geological modeling concepts, data inventory, conceptual model, problem formulation, large scale modeling, multiple point-based simulation and event-based modeling. Geostatistical methods are extensively illustrated through enhanced schematics, work flows and examples with discussion on method capabilities and selection. For example, this expanded second edition includes extensive discussion on the process of moving from an inventory of data and concepts through conceptual model to problem formulation to solve practical reservoir problems. A greater number of examples are included, with a set of practical geostatistical studies developed to illustrate the steps from data analysis and cleaning to post-processing, and ranking. New methods, which have developed in the field since the publication of the first edition, are discussed, such as models for integration of diverse data sources, multiple point-based simulation, event-based simulation, spatial bootstrap and methods to summarize geostatistical realizations.
Author : Hélder Rodrigues,José Herskovits,Christóvão Mota Soares,José Miranda Guedes,Aurelio Araujo,João Folgado,Filipa Moleiro,José Aguilar Madeira
Publisher : CRC Press
Page : 1078 pages
File Size : 46,6 Mb
Release : 2014-09-26
Category : Technology & Engineering
ISBN : 9781315732107
Optimization methodologies are fundamental instruments to tackle the complexity of today's engineering processes. Engineering Optimization 2014 is dedicated to optimization methods in engineering, and contains the papers presented at the 4th International Conference on Engineering Optimization (ENGOPT2014, Lisbon, Portugal, 8-11 September 2014). The book will be of interest to engineers, applied mathematicians, and computer scientists working on research, development and practical applications of optimization methods in engineering.