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Search Results: 1 - 10 of 138736 matches for " K. Chmielowiec "
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Fast, Parallel Algorithm for Multiplying Polynomials with Integer Coefficients
Andrzej Chmielowiec
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
Fractional Fourier Transform and Geometric Quantization
Witold Chmielowiec,Jerzy Kijowski
Physics , 2010, DOI: 10.1016/j.geomphys.2012.02.008
Abstract: Generalized Fourier transformation between the position and the momentum representation of a quantum state is constructed in a coordinate independent way. The only ingredient of this construction is the symplectic (canonical) geometry of the phase-space: no linear structure is necessary. It is shown that the "fractional Fourier transform" provides a simple example of this construction. As an application of this techniques we show that for any linear Hamiltonian system, its quantum dynamics can be obtained exactly as the lift of the corresponding classical dynamics by means of the above transformation. Moreover, it can be deduced from the free quantum evolution. This way new, unknown symmetries of the Schr\"odinger equation can be constructed. It is also argued that the above construction defines in a natural way a connection in the bundle of quantum states, with the base space describing all their possible representations. The non-flatness of this connection would be responsible for the non-existence of a quantum representation of the complete algebra of classical observables.
Hamiltonian description of radiation phenomena: Trautman-Bondi energy and corner conditions
Witold Chmielowiec,Jerzy Kijowski
Mathematics , 2008, DOI: 10.1016/S0034-4877(09)90028-3
Abstract: Cauchy initial value problem on a hyperboloid is proved to define a Hamiltonian system, provided the radiation data at null infinity are also taken into account, as a part of Cauchy data. The "Trautman-Bondi mass", supplemented by the "already radiated energy" assigned to radiation data, plays role of the Hamiltonian function. This approach leads to correct description of the corner conditions.
The Laughter of Ticklishness Is a Darwinian Feature Related to Empathy in Both Genders: Self-Esteem in Men and Sexism in Women  [PDF]
Verónica Juárez-Ramos, Elvira Salazar-López, María ángeles Rodríguez Artacho, K. Chmielowiec, A. Riquelme, J. Fernández-Gómez, A. I. Fernández-Ramirez, A. Vicente de Haro, A. Miranda, M. Caballero, B. Machado, Antonio González Hernández, Emilio Gómez Milán
Open Journal of Medical Psychology (OJMP) , 2014, DOI: 10.4236/ojmp.2014.31002
Abstract: The theory of false alarm for laughter could explain the involuntary laugh when someone is tickled. To put this hypothesis to the test, we handed out a questionnaire (180 items) with two hundred university students. Our main results are: In women who like being tickled, we discover components related to pleasure, erotism, feeling of affection, arousal, uncontrollability, domination, sexism and Darwinian (golden ratio) and psychological traits (empathy, low schizotypy and external locus of control) that are not present in the laughter at a stumble. The relation of both types of laughter with sense of humor is also differential. In men who like being tickled, we discover components related to masturbation, sexual fantasies, erotism, arousal, domination, sexist humour and Darwinian (square chin, feeling of masculinity) and psychological traits (empathic stress, low schizotypy, external locus of control and overall self-esteem). The relationship between being tickled and self-esteem shows a double aspect in men: It is positive in men who like being tickled and negative in men who do not like being tickled. For women there is not a relationship between self-esteem and tickling. Our conclusion is that laughter of ticklishness is a Darwinian feature related to empathy.

 

Levels of hematological parameters of pigs over the fattening period
Anna Chmielowiec-Korzeniowska, Marek Babicz, Magdalena Pyrz
Annales UMCS, Zootechnica , 2008, DOI: 10.2478/v10083-008-0010-6
Abstract: The study was conducted on 24 pigs. Blood for the hematological tests was collected four times over the fattening period. The examinations showed that the level of hematological indices is an animal age-dependent. Advancing pig age brought about a statistically significant increase of hematocrit, red cell count and blood platelet count. This effect was accompanied by a decline of mean cell hemoglobin (MCH) and mean cell hemoglobin concentration (MCHC) in a red blood cell. A change of place and nutrition made a stressor for the pigs investigated, thus in 11 week of animal age, that is a week following pigs transportation to the fattening house, a drastic change of red cell indices and white blood cells indices was noted. A significant decrease of the level of hemoglobin (HGB), mean cell hemoglobin (MCH) and lymphocytes were observed with a simultaneous increase of neutrophiles (Neu).
Air emission of merkaptans and other sulfur compounds from poultry farm
Anna Chmielowiec-Korzeniowska, Leszek Tymczyna, Renata Wi ch
Annales UMCS, Zootechnica , 2008, DOI: 10.2478/v10083-008-0006-2
Abstract: The air chromatographic analysis conducted at the poultry farm and its surrounding area aimed at determination of organic and inorganic sulfur compound concentration. The studies revealed the presence of air sulfur compounds of a markedly odourgenic nature, such as hydrogen sulfide, sulfides, disulfides and merkaptans. The average concentration of sulfur compounds (including unidentified ones) in the air of the hen house reached 73.06 μg·m 3. Besides, the increased gaseous pollutant level in the air was established. The content of the determined contaminants was subject to a sampling site and time, in that atmospheric air temperature. The concentration of the identified merkaptans sum exceeded the average reference values in the air for a calendar year.
Experimental Evaluation of Supercapacitor-Fuel Cell Hybrid Power Source for HY-IEL Scooter
Piotr Bujlo,Grzegorz Pasciak,Jacek Chmielowiec,Andrzej Sikora
Journal of Energy , 2013, DOI: 10.1155/2013/162457
Abstract: This paper presents the results of development of a hybrid fuel cell supercapacitor power system for vehicular applications that was developed and investigated at the Energy Sources Research Section of the Wroclaw Division of Electrotechnical Institute (IEL/OW). The hybrid power source consists of a polymer exchange membrane fuel cell (PEMFC) stack and an energy-type supercapacitor that supports the system in time of peak power demands. The developed system was installed in the HY-IEL electric scooter. The vehicle was equipped with auxiliary components (e.g., air compressor, hydrogen tank, and electromagnetic valves) needed for proper operation of the fuel cell stack, as well as electronic control circuits and a data storage unit that enabled on-line recording of system and vehicle operation parameters. Attention is focused on the system energy flow monitoring. The experimental part includes field test results of a vehicle powered with the fuel cell-supercapacitor system. Values of currents and voltages recorded for the system, as well as the vehicle’s velocity and hydrogen consumption rate, are presented versus time of the experiment. Operation of the hybrid power system is discussed and analysed based on the results of measurements obtained. 1. Introduction Hydrogen becomes a more reliable future energy carrier and its usage as fuel for fuel cells becomes a more and more probable future method for electric energy production. This statement can be supported by a large number of scientific papers that present the latest developments on fuel cell technology [1–3], innovative fuel cell stationary [4, 5], and mobile and automotive applications [6–8], as well as considerations on hydrogen economy prospects [9–11]. Polymer exchange membrane fuel cell (PEMFC) is the most promising fuel cell type for future commercialization and application. Although PEMFC has suitable parameters for the previously mentioned applications, among others low operating temperature and high current density, it cannot serve as the only energy source in the power system. Hybridization of power sources is needed to provide immediate power supply for auxiliary devices during the fuel cell start-up and to supply power during peak demands. The latter is important especially in the case of automotive applications where load changes are sudden and the power train requires an immediate power supply for a comfortable drive. There are literature reports concerning battery/fuel cell hybrid systems [12, 13]. Because the battery presents some drawbacks, such as low life cycle, long recharging
The Constrained Mean-Semivariance Portfolio Optimization Problem with the Support of a Novel Multiobjective Evolutionary Algorithm  [PDF]
K. Liagkouras, K. Metaxiotis
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.67B005
Abstract:

The paper addresses the constrained mean-semivariance portfolio optimization problem with the support of a novel multi-objective evolutionary algorithm (n-MOEA). The use of semivariance as the risk quantification measure and the real world constraints imposed to the model make the problem difficult to be solved with exact methods. Thanks to the exploratory mechanism, n-MOEA concentrates the search effort where is needed more and provides a well formed efficient frontier with the solutions spread across the whole frontier. We also provide evidence for the robustness of the produced non-dominated solutions by carrying out, out-of-sample testing during both bull and bear market conditions on FTSE-100.

Design of a Cantilever - Type Rotating Bending Fatigue Testing Machine  [PDF]
K. K. Alaneme
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1011078
Abstract: This research is centered on the design of a low–cost cantilever loading rotating bending fatigue testing machine using locally sourced materials. The design principle was based on the adaptation of the technical theory of bending of elastic beams. Design drawings were produced and components/materials selections were based on functionality, durability, cost and local availability. The major parts of the machine: the machine main frame, the rotating shaft, the bearing and the bearing housing, the specimen clamping system, pulleys, speed counter, electric motor, and dead weights; were fabricated and then assembled following the design specifications. The machine performance was evaluated using test specimens which were machined in conformity with standard procedures. It was observed that the machine has the potentials of generating reliable bending stress – number of cycles data; and the cost of design (171,000 Naira) was lower in comparison to that of rotating bending machines from abroad. Also the machine has the advantages of ease of operation and maintenance, and is safe for use.
Wireless Sensor Network Lifetime Enhancement Using Modified Clustering and Scheduling Algorithm  [PDF]
K. Ramesh, K. Somasundaram
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78154
Abstract: Random distribution of sensor nodes in large scale network leads redundant nodes in the application field. Sensor nodes are with irreplaceable battery in nature, which drains the energy due to?repeated collection of data and decreases network lifetime. Scheduling algorithms are the one way?of addressing this issue. In proposed method, an optimized sleep scheduling used to enhance the?network lifetime. While using the scheduling algorithm, the target coverage and data collection?must be maintained throughout the network. In-network, aggregation method also used to remove the unwanted information in the collected data in level. Modified clustering algorithm?highlights three cluster heads in each cluster which are separated by minimum distance between them.?The simulation results show the 20% improvement in network lifetime, 25% improvement in?throughput and 30% improvement in end to end delay.
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