Search

Your search keyword '"Sosnowski, J."' showing total 383 results
Start Over Author "Sosnowski, J."
383 results on '"Sosnowski, J."'

1. New model of the pinning potential barrier in HTc superconductors

Author

Sosnowski, J.

Subjects
Condensed Matter - Superconductivity
Abstract

New model of the pinning potential barrier in multi-layered HTc superconductors has been presented, basing on geometrical approach to the capturing interaction of pancake type vortices with nano-scale defects. Using this model the transport current flow phenomena in these materials, especially current-voltage characteristics and critical current density, have been considered. Details of theoretical analysis are given, including derivation of basic mathematical equations describing the potential barrier in the function of transport current density and initial position of captured pancake vortex. Computer simulation has been performed then of influence of transport current amplitude on potential barrier height for various sizes of pinning centers and initial pancake vortex position as well as influence of fast neutrons irradiation on critical current of HTc layered superconductor.

Published
2016
Full Text
View/download PDF

2. Flux pinning on nano-sized defects and critical current in HTc superconductors

Author

Sosnowski, J.

Subjects
Condensed Matter - Superconductivity
Abstract

New results of the investigations critical current problems in the high temperature oxide superconductors are presented, basing on an analysis of the flux pinning on nano-sized centers. New model of the interaction pancake vortices with the nano-sized centers is proposed, while comparison of obtained results with others pinning forces approaches presented. The energy balance approach is applied, which leads to the appearance of the potential barrier determining the pancake vortices movement in the flux creep process. Various initial positions of the captured vortex have been analyzed, while variation of the screening currents for such configuration has been considered and initial calculations of the influence this effect on the current-voltage characteristics performed. The dependence of the critical current on the pinning centers parameters has been obtained while comparison with experimental data is given. Pinning force has been calculated and its temperature dependence, which is in qualitative agreement with an experiment. Critical current determines the magnetic induction profiles and therefore flux trapping, very important parameter from the point of view of an application HTc superconductors as permanent magnets. The influence of the critical current on the flux trapping in ceramic granular superconductors is calculated as well as influence of various other material parameters - grain radius, surface barrier, fulfillment of the ceramic with superconducting grains. Influence of the critical current on a.c. losses in second generation HTc tapes with magnetic substrate is discussed briefly too., Comment: 29 pages, 50 equations, 35 figures, 13 references

Published
2010

5. Morpho-physiological effects of Stymjod foliar application on Dactylis glomerata L

Author

Sosnowski, J., Jankowski, K., Truba, M., Novák, J., Zdun, E., and Skrzyczyńska, J.

Subjects
plant morphology, chlorophyll content, iodine, article, articles, food and beverages, photosynthetic activity
Abstract

The aim of the experiment was to study the effects of foliar application of a growth regulator containing iodine nanoparticles, with the trade name of Stymjod, on morphometrics, photosynthetic activity and chlorophyll content of Dactylis glomerate L. The following parameters were determined: the weight of fresh and dry matter of plants, leaves and roots, the number of shoots and leaves, potential (FV/Fm) and effective (F/Fm’) quantum efficiency of photosystem, photochemical (qP) and non-photochemical (qN) quenching, as well as chlorophyll a and chlorophyll b content in leaf blades. The pot experiment was carried out in a breeding room. Stymjod was applied at 1.5%, 3% and 4.5% concentrations in the spray solution. It is a nanotechnology-based growth regulator, with easily assimilable forms of mineral and organic ingredients, favorably affecting plant ontogenesis. Plants were treated twice with a single dose of 50 mL of spray per pot. They were sprayed till they were completely covered with the liquid. Distilled water was used to spray control plants. The results were statistically processed using analysis of variance, while the significance of the differences between means was determined with Tukey's test with P = 0.05. In the experiment it was found that different concentrations of Stymjod in the spray resulted in different response of plants. The best morphological effects were obtained using the concentration of the product exceeding 3%. In the test conditions Stymjod applied to D. glomerata increased the efficiency of the photosynthetic apparatus and the content of chlorophyll pigments.

Published
2020

16. Autodiagnostics for transputer systems

Author

Sosnowski, J., Derezinska, A., and Bluemke, I.

Subjects
Transputers -- Testing, Parallel processing -- Research, Computerized testing -- Methods
Published
1993

36. Influence of Nano-defects on Current-voltage Characteristics of HTc Superconductors

Author

Sosnowski, J.

Subjects
Critical current, Current-voltage characteristics, Condensed Matter::Superconductivity, Nano-sized defects, Vortex dynamics, HTc superconductors, irradiation effects in solids
Abstract

Theoretical analysis is presented of the influence on the current-voltage characteristics of the nanosized defects, which may be created by heavy ions irradiation or can arise in technological process, for instance during the winding procedure of the superconducting coil. Results of calculations, performed basing on developed model of the interaction of pancake type vortices appearing in HTc superconductors with nano-sized defects are presented. The energy balance for flux creep process is deduced and current-voltage characteristics calculated in the function of static magnetic field, in accordance with experimental behavior. This static analysis has been extended further on the case of the time-varying magnetic field in which existence of dynamical anomalies is predicted, according to our previous experimental data. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35112

Published
2013

37. THE EFFECTS OF SOIL CONDITIONERS ON TOTAL PROTEIN AND CRUDE FIBER CONCENTRATION IN SELECTED GRASS SPECIES.

Author

TRUBA, M., JANKOWSKI, K., WIŚNIEWSKA-KADŻAJAN, B., SOSNOWSKI, J., MALINOWSKA, E., and BARSZCZEWSKI, J.

Subjects
SOIL conditioners, GRASSES, FERTILIZERS, ORCHARD grass, LOLIUM perenne
Abstract

The aim of this study was to determine the influence of biological preparations and mineral fertilizers on total protein and crude fiber in Dactylis glomerata and Lolium perenne. The study was carried out in years 2011-2014 in three repetitions, on 3 m2 experimental plots. There were mineral, biological or both mineral and biological fertilization applied on the grass. Mineral fertilization included nitrogen, phosphorus, potassium. There were used three biological preparations named UGmax, Humus Active Papka and Eko-Użyźniacz in the studies. For both grass species Eko-Użyźniacz applied together with mineral fertilizers increased protein content in fodder. Application of Humus Active Papka with mineral fertilizers lowered crude fiber concentration in fodder. The highest concentration of total protein was in Dactylis glomerata and Lolium perenne from the plots where soil conditioners together with mineral fertilizers were applied. The most advantageous concentration of crude fiber was in Dactylis glomerata growing on the plot with Humus Active Papka together with mineral fertilizers applied, while in Lolium perenne on the plot with Eko-Użyźniacz applied, without mineral fertilizers. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

40. Influence of Radiation Induced Nano-defects on Critical Current of HTc Superconductors

Author

Sosnowski, J.

Subjects
Nano-Sized Defects, Condensed Matter::Superconductivity, Critical Current, Irradiation, Superconductors
Abstract

Superconductors, including HTc materials are more and more frequently used in modern nuclear physics devices. During the work of nuclear accelerators arises however the radiation of heavy ions or fast neutrons, which can reach the superconducting windings, creating nano-sized defects. It influences properties of superconductors. In the paper is given theoretical analysis of the influence of nano-defects on the critical current of HTc superconductors. New theoretical model of the critical current is proposed based on an analysis of the interaction of nano-defects acting as pinning centers with pancake vortices appearing in HTc superconductors. Nano-defects from one side destroy the structure of superconducting materials, which effect has negative meaning, while from other side anchorage of individual vortices or vortex lattice on defects will improve critical current. These both opposite phenomena are considered for HTc materials and also for A15 type superconductors, in which superconductivity is strongly related to state of ordering of transition metals as Nb, V in linear chains. The potential barrier against pancake vortices movement has been considered and calculations of an influence of sizes of nano-defects on current-voltage characteristics performed. Expression for an energy barrier allowed also to determine the time stability of the magnetic vortex structure and flowing current, which effect has especial meaning in the superconducting shields. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35418

Published
2012

50. IMPACT OF SOIL CONDITIONERS AND WEATHER ON LAWN COMPACTNESS.

Author

JANKOWSKI, K., SOSNOWSKI, J., TRUBA, M., SKRZYCZYŃSKA, J., MALINOWSKA, E., and WIŚNIEWSKA-KADŻAJAN, B.

Subjects
SOIL conditioners, TURFGRASSES, EFFECT of soil conditioners on plants, GARDEN fertilizers, COMPACT spaces (Topology), LOLIUM perenne, RED fescue
Abstract

The aim of this paper is to determine the effect of soil conditioners and one mineral fertilizer on turf, as well as their interaction with meteorological conditions in maintaining of lawn compactness. The field experiment was conducted in the experimental facility between 2013 and 2015. The following grass species were used in the experiment: Lolium perenne, Festuca rubra, and Poa pratensis. Another experimental factor tested in the research was soil conditioners. Between 2013 and 2015 an assessment of grass compactness based on the methods described by Domański (1998) was carried out. This assessment was conducted in three seasons: spring, summer, and autumn. Grass species tested in the experiment formed turf of different compactness, varying throughout seasons of the year and responding strongly to weather conditions. In drier periods red fescue had better turf, contrary to smooth meadow grass and perennial ryegrass, both of which had better turf in more humid conditions. Out of all the types of fertilizer Humus Active Papka affected turf compactness in the most favourable way although the response of individual grass species was not the same. From a practical point of view out of the grass species tested in the experiment Poa pratensis treated with Eko-Użyźniacz responded the most favourably. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results