Keresés
117 találatból megjelenítve: 41-50
Cím: Mixed Coloured Permutations
Szerző: ;
Dátum: 2020
Feltöltve: 2023-02-16
(2020)
In this paper, we introduce mixed coloured permutations, permutations with certain coloured cycles, and study the enumerative properties of these combinatorial objects. We derive the generating function, closed forms, ...
Cím: Effect of Land Use on the Benthic Diatom Community of the Danube River in the Region of Budapest
Szerző: ; ; ; ; ; ; ; ; ; ; ;
Dátum: 2020
Feltöltve: 2023-02-16
(2020)
Urbanization significantly influences the ecosystems of rivers in various ways, including the so-called loading e ff ect of wastewater production. Benthic diatoms are used in ecological status assessments of waters. Beside ...
Cím: NDVI as a Proxy for Estimating Sedimentation and Vegetation Spread in Artificial Lakes—Monitoring of Spatial and Temporal Changes by Using Satellite Images Overarching Three Decades
Szerző: ; ; ; ;
Dátum: 2020
Feltöltve: 2023-02-16
(2020)
Observing wetland areas and monitoring changes are crucial to understand hydrological and ecological processes. Sedimentation-induced vegetation spread is a typical process in the succession of lakes endangering these ...
Cím: Laboratory experiments on the influence of stratification and a bottom sill on seiche damping
Szerző: ; ;
Dátum: 2021
Feltöltve: 2023-02-16
(2021)
The damping of water surface standing waves (seiche modes) and the associated excitation of baroclinic internal waves are studied experimentally in a quasi-two-layer laboratory setting with a topographic obstacle at the ...
Cím: A New Argument Against Cooling by Convective Air Eddies Formed Above Sunlit Zebra Stripes
Szerző: ; ; ;
Dátum: 2021
Feltöltve: 2023-02-16
(2021)
There is a long-lasting debate about the possible functions of zebra stripes. According to one hypothesis, periodical convective air eddies form over sunlit zebra stripes which cool the body. However, the formation of ...
Cím: Fluid Flow Model Applied for Environmental Problems at a Combined Sewer Structure
Szerző: ; ;
Dátum: 2021
Feltöltve: 2023-02-20
(2021)
A junction structure of the greatest combined sewers of Budapest (Hungary) was under hydrodynamic and water quality examinations. The selected junction performs an important role in the operation of a combined sewer overflow. ...
Cím: Bijective enumerations of ?-free 0–1 matrices
Szerző: ;
Dátum: 2018
Feltöltve: 2023-02-20
(2018)
We construct a new bijection between the set of n × k 0–1 matrices with no three 1’s forming a ? configuration and the set of ( n, k )-Callan sequences, a simple structure counted by poly-Bernoulli numbers. We give two ...
Cím: Some applications of S-restricted set partitions
Szerző: ;
Dátum: 2019
Feltöltve: 2023-02-20
(2019)
In the paper, the authors present several new relations and applications for the combinatorialsequence that counts the possible partitions of a finite set with the restriction that the size ofeach block is contained in a ...
Cím: Secondary Stochastic Processes and Storage Reservoir Optimization
Szerző: ; ;
Dátum: 2018
Feltöltve: 2023-02-20
(2018)
In the first two sections of the paper, stream flow is investigated on a probability theoretical basis. We will show that under some realistic conditions its probability distribution is of gamma type. In the model of the ...
Cím: Poly-Bernoulli Numbers and Eulerian Numbers
Szerző: ;
Dátum: 2018
Feltöltve: 2023-02-20
(2018)
In this note we prove, using combinatorial arguments, some new formulas connecting Poly-Bernoulli numbers with negative indices to Eulerian numbers.