A new type of high-power electronic device gyroton on the corrugated resonator is described. In this device the spatial bunching of the electron beam does not occur;however, highly efficient conversion of electron bea...
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ISBN:
(纸本)9781424435005
A new type of high-power electronic device gyroton on the corrugated resonator is described. In this device the spatial bunching of the electron beam does not occur;however, highly efficient conversion of electron beam power into the power of the rotating electromagnetic field is possible. The electron beam entering the device is linear;due to its initial deviation from the was by the slowing TM11 wave, it then returns its longitudinal energy to the same wave with the efficiency of more than 88%.
The results of investigating the microwave generator with the goffered cavity are presented. Gyroton on the goffred resonator makes it possible to achieve efficiency 81%.
ISBN:
(纸本)1424401089
The results of investigating the microwave generator with the goffered cavity are presented. Gyroton on the goffred resonator makes it possible to achieve efficiency 81%.
作者：
Topolyuk, YuriyNASU
Dept Numer Methods Math Phys Pidstryhach Inst Appl Problems Mech & Math Lvov Ukraine Ivan Franko Natl Univ
Dept Programming Lvov Ukraine
An advanced method of constructing an analytical-numerical solution of the nonlinear antenna synthesis problem based on a given amplitude directivity pattern is considered. Using the method of least squares, the case ...
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ISBN:
(纸本)9798331506094;9798331506087
An advanced method of constructing an analytical-numerical solution of the nonlinear antenna synthesis problem based on a given amplitude directivity pattern is considered. Using the method of least squares, the case of obtaining an approximate analytical solution of the problem of non-convex minimization of functional for the case of isometric operator of direct problem is presented. numerical results are given that confirm the effectiveness of the proposed approach.
The impact of fertilizer application on soil aggregate stability is of increasing interest to soil scientists. Aggregate water stability depends primarily on soil organic matter. We studied silty loam and loamy sand a...
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The impact of fertilizer application on soil aggregate stability is of increasing interest to soil scientists. Aggregate water stability depends primarily on soil organic matter. We studied silty loam and loamy sand aggregates from three long-term fertilizer treatments (control, pig manure and NPK) which significantly altered the quantity of organic matter. A new approach to examining aggregate stability was used: soil aggregates were immersed in methanol-water solutions with methanol at 0, 20, 40 and 60% concentration (C), and non-disrupted aggregates were separated after 30minutes. The aggregate resistance R(C) against each solution was taken as the percentage of stable aggregates. Overall resistance of the aggregates was taken as the R-tot parameter given by the product of four R(C) values. The R(C) values of all aggregates were positively correlated with C. The R(60) values were independent of the applied fertilizer. The R(0) value for silty loam aggregates ranged from 28% (pig manure) to 7% (NPK), while that for loamy sand equalled 7-9% in all cases. The R(20) values were most effective at differentiating the soils and the fertilizer treatments. However, the R-tot value was a better indicator of aggregate stability. Greater differences in stabilities of aggregates were noted in loamy sand. Mineral fertilizer application seemed to decrease aggregate resistance in both soils. Total organic carbon and nitrogen content in all non-disrupted aggregates were negatively correlated with methanol concentration (C) of the solution applied for aggregate separation. The largest decrease was for the pig manure treatment, and the smallest was for the control. Porosity and pore size distributions of the aggregates were derived from micro-tomography and approximated to lognormal pore size distributions. Larger porosities and pores were found in water-stable aggregates than in methanol-stable aggregates. It seems that the dominant mechanisms for aggregate instability during fast
作者：
Gorcun, Omer FarukSimic, VladimirKundu, PradipOzbek, AsirKucukonder, HandeKadir Has Univ
Fac Econ Adm & Social Sci Dept Business Adm Cibali Ave Kadir Has St Fatih TR-34083 Istanbul Turkiye Univ Belgrade
Fac Transport & Traff Engn Vojvode Stepe 305 Belgrade 11010 Serbia Yuan Ze Univ
Coll Engn Dept Ind Engn & Management Yuandong Rd Taoyuan 320315 Taiwan Korea Univ
Coll Informat Dept Comp Sci & Engn 145 Anam Ro Seoul 02841 South Korea XIM Univ
Sch Comp Sci & Engn Bhubaneswar India Kirikkale Univ
Vocat Sch Kirikkale Comp Programming Kirikkale Turkiye Bartin Univ
Fac Econ & Adm Sci Dept Business Adm & Numer Methods Bartin Turkiye
According to reports from international bodies such as the World Health Organization and the United Nations, transportation is one of the leading contributors to environmental pollution and climate change. Electric ve...
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According to reports from international bodies such as the World Health Organization and the United Nations, transportation is one of the leading contributors to environmental pollution and climate change. Electric vehicles present a practical solution to reducing emissions, particularly for industrial users. However, industrial users' selection of electric vehicles involves different dynamics than individual users, making it a more complex process for companies. This paper aims to evaluate the selection criteria for electric vehicle fleets among industrial users using a novel multi-criteria decision-making framework based on interval-valued intuitionistic fuzzy sets. The model assesses various factors influencing industrial users' decisions and ranks the available electric vehicle options accordingly. The results indicate that driving range, purchase price, and charging time are the most influential factors in the decision-making process. Furthermore, the findings confirm that the Tesla Model S P100D is the most suitable option for industrial users, given its superior performance in these critical criteria.
New explicit one-step high-order numerical methods (Taylor series and Runge-Kutta methods) for singular initial value problems for second-order nonlinear ordinary differential equations are constructed. These methods ...
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New explicit one-step high-order numerical methods (Taylor series and Runge-Kutta methods) for singular initial value problems for second-order nonlinear ordinary differential equations are constructed. These methods allow to calculate an approximate solution in the neighborhood of a singular point x=0 with a high-order of accuracy. By the substitution of the independent variable, we transform the original singular initial value problem into a nonsingular one at an infinite interval. To solve this nonsingular problem, standard numerical methods with initial conditions obtained near a singular point can be used. The effectiveness of the presented approach is confirmed by numerical experiments.
作者：
Fumagalli, Luis Andre WerneckeRezende, Denis AlcidesGuimaraes, Thiago AndrePontificia Univ Catolica Parana PUCPR
R Imaculada Conceicao 1155 BR-80215901 Curitiba PR Brazil FAE Business Sch FAE
Av Visconde Guarapuava 3263 BR-80010100 Curitiba PR Brazil Depaul Univ
Sch Publ Serv Chicago IL 60604 USA USP Univ
Sao Paulo Brazil UFSC Univ
Informat Technol & Publ Private Strateg Planning Florianopolis SC Brazil UFPR Univ
Informat Technol Curitiba Parana Brazil Fed Univ Parana UFPR
Res Grp Technol Appl Optimizat GTAO Av Prefeito Lothario Meissner 632 Curitiba Parana Brazil UFPR Univ
Dept Gen & Appl Adm DAGA Curitiba Parana Brazil Univ Laval
Ctr Interuniv Rech Reseaux Entreprise Logist & Tr Fed Inst Educ Sci & Technol Parana IFPR Quebec City PQ Canada UFPR
Operat Res Grad Program Numer Methods Engn Area Concentrat Math Programming Curitiba Parana Brazil
Public transport was already one of the biggest issues for all municipalities where people are highly concentrated at the same space at the same time. With COVID-19 pandemic and social distancing consequences, mass tr...
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Public transport was already one of the biggest issues for all municipalities where people are highly concentrated at the same space at the same time. With COVID-19 pandemic and social distancing consequences, mass transportation is actually the main barrier for students and workers dependents of transport to go back to their daily routines with comfort and safety. Thus, the objective is to determine a demand control able to equalize the number of passengers in each car, respecting the COVID-19 social distancing protocols. The number of passengers in each time-ofday range were combined in four different models that included independent variables related to passenger's behavior indicating that almost 90% of all passengers are following a very strict and straight daily routine that can be coordinated and scheduled creating enough time space one from the other to avoid undesirable concentrations inside buses and bus stops. In conclusion, a very accurate urban management tool can arise from the study and may be able to solve not only the pandemic issues but also to improve local public services efficiency, to attract private investments and to improve citizen's quality of life.
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