A5012124851- Hydrology and Drought Analysis
- Climate variability and models
- Hydrology and Watershed Management Studies
- Analytic Number Theory Research
- Rings, Modules, and Algebras
- Coding theory and cryptography
- Meteorological Phenomena and Simulations
- advanced mathematical theories
- Limits and Structures in Graph Theory
- Flood Risk Assessment and Management
- Mathematical Approximation and Integration
- Hydrology and Sediment Transport Processes
- Atmospheric and Environmental Gas Dynamics
- Advanced Topology and Set Theory
- Mathematical Dynamics and Fractals
- Functional Equations Stability Results
- Commutative Algebra and Its Applications
- Mathematical functions and polynomials
- Meromorphic and Entire Functions
- Climate change impacts on agriculture
- graph theory and CDMA systems
- Polynomial and algebraic computation
- Advanced Algebra and Geometry
- Financial Risk and Volatility Modeling
- Advanced Algebra and Logic
Adam Mickiewicz University in Poznań
2005-2022
Polish Academy of Sciences
2004-2010
Instytut Środowiska Rolniczego i Leśnego Polskiej Akademii Nauk
2010
Abstract Results of a study on change detection in hydrological time series annual maximum river flow are presented. Out more than thousand long made available by the Global Runoff Data Centre (GRDC) Koblenz, Germany, worldwide data set consisting 195 daily mean records was selected, based such criteria as length series, currency, lack gaps and missing values, adequate geographical distribution, priority to smaller catchments. The analysis flows does not support hypothesis ubiquitous growth...
CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 31:51-58 (2006) - doi:10.3354/cr031051 Precipitation extremes in changing climate of Europe Zbigniew W. Kundzewicz1,2,*, Maciej Radziejewski1,3, Iwona Pinskwar1 1Research Centre for Agricultural and Forest Environment, Polish Academy Sciences, Bukowska 19, 60809 Poznan, Poland 2Potsdam Institute Impact Research, Telegrafenberg,...
Abstract. Multi-model ensemble climate projections in the ENSEMBLES Project of EU allowed authors to quantify selected extreme-weather indices for Poland, importance impacts on systems and sectors. Among were: number days a year with high value heat index; maximum minimum temperatures; length vegetation period; consecutive dry days. Agricultural, hydrological, human health were applied evaluate changing risk weather extremes Poland three To achieve this, model-based simulations compared two...
Abstract One of the important practical problems in analysis long time series hydrological records is evaluation detectability trends. This not a trivial task, especially where change weak, while natural variability considerable (e.g. case river flow records). The results study run-up effect allow experts to assess how strong (gradual trend or abrupt jump) must be and it take order detected by statistical tests. A set generated, trend-free data mimicking records, has been contaminated...
Abstract Detection of nonstationarity in series flow records is vast scientific and practical significance. In order to develop guidance as the choice an appropriate test, among many candidates, one has recourse analysis a controlled trend artificially introduced generated data mimicking river observations. Raw good quality were normalized de-seasonalized subsequently transformed Fourier spectral domain. Keeping power spectrum preserved, phase was subjected randomization. After...
CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 31:35-49 (2006) - doi:10.3354/cr031035 Defining dry/wet spells for point observations, observed area averages, and regional climate model gridboxes in Europe Lars Bärring1,2,*, Tom Holt3, Maj-Lena Linderson1, Maciej Radziejewski4,5, Marco Moriondo6, Jean P. Palutikof7 1Department of Physical Geography Ecosystems Analysis,...
We investigate weakly half-factorial sets in finite abelian groups, a concept introduced by J. Śliwa to study sets. fully characterize given group, and determine the maximum cardinality of such set. This leads several new results on sets; particular we solve problem W. Narkiewicz some special cases. also arithmetical consequences weakly-half-factoriality terms factorization lengths block monoids.
We show that the error term of counting function sums two squares has oscillations logarithmic frequency and size x1/2(log x)−3/2−ε. do by showing a theorem on for terms rather general class real functions. If Mellin transform f(x) singularity at ρ=β+iγ, γ≠0, with principal summand form (s−ρ)−b(log(s−ρ))ch(s), h(ρ)≠0, we obtain xβ(log x)b−1−ε. also apply this result to other arithmetical functions related squares.
The investigation of certain counting functions elements with given factorization properties in the ring integers an algebraic number field gives rise to combinatorial problems class group. In this paper a constant arising from inve
We study ``forbidden'' conductors,i.e. numbers $q>0$ satisfying algebraic criteria introduced by J. Kaczorowski, A. Perelli and M. Radziejewski, that cannot be conductors of $L$-functionsof degree $2$ from the extended Selberg class. show setof forbidden $q$ is dense in interval $(0,4)$, solving a problemposed [6]. also find positive pointsof accumulation rational $q$.
We study "forbidden" conductors, i.e. numbers q > 0 satisfying algebraic criteria introduced by J. Kaczorowski, A. Perelli and M. Radziejewski [Acta Arith. 210 (2023), 1-21], that cannot be conductors of L-functions degree 2 from the extended Selberg class. show set forbidden is dense in interval (0,4), solving a problem posed 1-21]. also find positive points accumulation rational q.
We improve the lower bound for $V(T)$, number of sign changes error term $\psi(x)-x$ in Prime Number Theorem interval $[1,T]$ large $T$. show that \[ \liminf_{T\to\infty}\frac{V(T)}{\log T}\geq\frac{\gamma_{0}}{\pi}+\frac{1}{60} \] where $\gamma_{0}=14.13\ldots$ is imaginary part lowest-lying non-trivial zero Riemann zeta-function. The result based on a new density estimate zeros associated $k$-function, over $4\cdot10^{21}$ times better than previously known estimates this type.