Wyniki wyszukiwania - Biblioteka Nauki

1

The effect of the age of Scots pine (Pinus sylvestris L.) stands on the physical properties of seeds and the operating parameters of cleaning machines

100%

Kaliniewicz Z. , Rawa T. , Tylek P. , Markowski P. , Anders A. , Fura S.

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2013

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tom nr 16(1)

63--72

EN

Critical transport velocity, the thickness, width, length, the angle of sliding friction and weight of Scots pine seeds harvested from conservation seed stands were measured. Correlations were determined between the age of parent stands (124 to 180 years old) and the above parameters of Scots pine seeds. Significant correlations were found between the age of parents stands and the weight, dimensions and the angle of sliding friction of seeds. Such a correlation was not observed for critical transport velocity. The noted correlations were presented as first-order equations which show that among the studied seed properties, average seed weight changed to the highest degree – it decreased by ca. 15% as Scots pine trees grew older.

2

Symptomy uzależnienia studentów od Internetu a poziom ich kompetencji informatycznych

100%

Lis R.

Biuletyn Edukacji Medialnej

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2012

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nr 1

27-37

EN

The investigation confirms the hypothesis that some symptoms of Internet addiction are related to high levels of information competence of students. Then we deal with rational and advanced Internet use assisting our mental development. In the case of students with relatively weak results in studies and low level information competence, symptoms of internet addictions frequently occur, which result in negative emotions and motivations. This leads to internet addiction, which provides compensation for emotional and social deficits of student’s personality.

3

Correlation and interpretation of thermal properties of volcanic rocks from Austria

100%

Gegenhuber N. , Dertnig F.

Acta Geophysica

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2023

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tom Vol. 71, no. 3

1251--1258

EN

Thermal properties of rocks are of great importance not only for geothermal projects. The focus of petrophysical data presented here is laid mainly on volcanic rocks. Thermal properties include not only thermal conductivity but also heat production and heat capacity. A full range of dataset and analysis out of it is presented here. The target of this study is to deliver new insights in the thermal properties of volcanic rocks of Austria. The focus is laid on thermal conductivity—understanding of influencing factors and correlations with other properties, like compressional wave velocity, electrical resistivity or radiogenic heat production. Therefore, a set of data from various volcanic rocks of Austria is presented, analysed in detail and new correlations are presented. The correlations can be further applied on logging data to derive thermal properties in the field. These improved correlations and further interpretations can help in planning geothermal projects and can improve the output of simulations because of the better input data.

4

Heat transfer in plate heat exchanger channels: Experimental validation of selected correlation equations

100%

Cieśliński J. T. , Fiuk A. , Typiński K. , Siemieńczuk B.

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5

Alternative size and lifetime measurements for RHIC

100%

Pratt S.

Nukleonika

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2004

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tom Vol. 49,suppl.2

61-65

EN

Two-particle correlations based on the interference of identical particles have provided the chief means for determining the shape and lifetime of sources in relativistic heavy ion collisions (RHIC). Here, strong and Coulomb induced correlations are shown to provide similar information.

6

How to model BEC numerically?

100%

Utyuzh O. , Wilk G. , Włodarczyk Z.

Nukleonika

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2004

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tom Vol. 49,suppl.2

33-35

EN

A new method for numerical modelling of Bose-Einstein correlations observed in all kinds of multiparticle production processes is proposed.

7

Non-identical particle correlations in STAR

100%

Janik M. , Kisiel A. , Szarwas P.

Nukleonika

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2004

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tom Vol. 49,suppl.2

77-80

EN

Non-identical particle correlations offer new methods of probing the dynamics of heavy-ion collision. In STAR we have performed a correlation analysis of pion-kaon and pion-proton systems for square root sNN = 130 AGeV Au+Au collisions. The results show that average emission space-time points of pions, kaons and protons are not the same. These results are studied with the help of heavy-ion collision models. The asymmetries appear as a consequence of space-momentum correlations produced by transverse radial expansion of the system. The effects of emission time differences, coming from the decay of resonances are also investigated, and found to explain only part of the asymmetry.

8

BEC for photons and neutral pions

100%

Utyuzh O. , Wilk G.

Nukleonika

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2004

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tom Vol. 49,suppl.2

15-17

EN

The role of BEC for photons and neutral pions is briefly discussed and illustrated by means of a new method of numerical modelling of BEC proposed by us recently.

9

Proposition of numerical modelling of BEC

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Utyuzh O. , Wilk G. , Włodarczyk Z.

Nukleonika

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2006

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tom Vol. 51,suppl.3

105-108

EN

We propose an extension of the numerical method to model effect of Bose-Einstein correlations (BEC) observed in hadronization processes which allows for calculations not only the correlation functions C2(Qinv) (onedimensional), but also the corresponding C2(Qx,y,z) (i.e., three-dimensional). The method is based on the bunching of identical bosonic particles in elementary emitting cells (EEC) in phase space in a manner leading to proper Bose- Einstein form of distribution of energy (this was enough to calculate C2(Qinv)). To obtain C2(Qx,y,z) as well as one has to add to it the symmetrization of the multiparticle wave function to properly correlate space-time locations of produced particles with their energy-momentum characteristics.

10

Effect of hard processes on momentum correlations in pp and p(anti)p collisions

100%

Paić G. , Skowroński P.

Nukleonika

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2006

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tom Vol. 51,suppl.3

83-87

EN

The HBT radii extracted in pp and pp collisions at SPS and Tevatron show a clear correlation with the charged particle rapidity density. We propose to explain the correlation using a simple model where the distance from the initial hard parton-parton scattering to the hadronization point depends on the energy of the partons emitted. Since the particle multiplicity is correlated with the mean energy of the partons produced we can explain the experimental observations without invoking scenarios that assume a thermal fireball. The model has been applied with success to the existing experimental data both in the magnitude and the intensity of the correlation. The model has also been extended to pp collisions at the LHC energy of 14 TeV. The possibilities of a better insight into the string spatial development using 3D HBT analysis are discussed.

11

The evolution of correlation functions from low to high pT in PHENIX: from HBT to jets

100%

Mitchell J.

Nukleonika

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2006

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tom Vol. 51,suppl.3

79-81

EN

The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a survey of momentum correlations ranging from 200 MeV/c to 7 GeV/c in sNN = 200 GeV p+p, d+Au, Au+Au, and sNN = 62 GeV Au+Au collisions. The correlations are measured separately for like-sign and unlike-sign pairs. Comparisons of the properties of the near-side peak amplitude and width as a function of centrality and transverse momentum for each collision species are presented and discussed.

12

Macrofloral biostratigraphy of the Ottweiler Group in Saar-Lorraine and its consequences for Stephanian palynostratigraphy and geochronology

100%

Cleal C. J.

Studia Geologica Polonica

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2008

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tom Vol. 129

9-23

EN

A revised macrofloral biostratigraphy for the Stephanian Ottweiler Group of the Saar- Lorraine Coalfield places most of the succession in the upper Stephanian B Substage (Alethopteris zeilleri Zone). Only the Breitenbach Formation at the top of the Group indicates a position in the middle Stephanian C Substage (Sphenophyllum angustifolium Zone). These revised correlations now make the tonstein date for the Wahlschied Seam, one of the few reliable radiometric dates for the Stephanian Stage, compatible with the recently proposed Carboniferous time scales. It also explains the large time gap at the base of the Holz Conglomerate suggested by the radiometric dates. There is now little evidence that the palynological ST Zone extends lower than the Stephanian B Substage, and that there appears to be a gap in the palynological zonation between the lower Cantabrian and top of the Barruelian Substages.

13

Making science more interesting, easy to learn and (hopefully) enjoyable

88%

Arévalo-García E.

Edukacja Biologiczna i Środowiskowa

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2014

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nr 2

52-57

EN

Science is everywhere, it is part of every feature of our lives and it is known that plays an important role in influencing the activities of human beings. However there is a worldwide declining interest in the field. Herein we propose methods: analogies and metaphors, correlating science with everyday life, the role of science in daily life – to improve the way teachers explain scientific topics in order to help attract the attention of students to science. The use of these methods have already been effectively used in many countries, where students are being able to comprehend difficult and tricky subjects in a clear, understandable manner.

14

Microbial biomass versus soil fertility in forest sites

88%

Zwoliński J.

Polish Journal of Ecology

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2004

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tom Vol. 52, nr 4

553--561

EN

Soil chemistry, soil microbial biomass and mineralization rate of organic matter (OM) were estimated on plots, which were set up in Scots pine and Norway spruce forests in southern Poland. The aim of the study was to assess the relations between soil microbial biomass and chemical parameters associated with soil fertility. The size of microbial biomass was found to be significantly correlated with chemical parameters reflecting soil nutritional status (content of base cations, cation exchange capacity, base saturation) and organic matter quality (C[org] to macronutrients ratios). In addition, soil microbial biomass appeared to be strongly correlated with OM mineralization rate. These findings point out a distinct relationship between soil fertility and soil microbial biomass, suggesting that microbial biomass measurements provide a valid estimate of soil quality.

15

Identification of Statistical Relations between Tax Policies in Voivodship Capitals and Local Housing Market Development

88%

Zapotoczna M. , Cymerman J.

Barometr Regionalny. Analizy i prognozy

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2016

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nr 2(44)

173-185

EN

The authors seek the correlations between local council policies concerning residential property taxation and the growth of local housing markets in voivodship capitals in 2007–2013. The first part of the paper contains the analysis of the dynamics of changes in local property taxes followed by the evaluation of the development levels of local housing markets and their linear ordering by means of the property market development indicator. Then, in order to capture the similarities and identify trends on the local housing markets, the cities were classified into homogenous clusters. In the last stage of the analysis the authors evaluated the relevance of property tax rates adopted locally on the growth of local housing markets. The study results showed no statistically relevant correlation between the analysed phenomena — i.e., no effect of the local property tax rates on the decisons made by investors on the local housing markets.

PL

W artykule poszukiwano zależności pomiędzy prowadzoną przez władze lokalne polityką podatkową w zakresie podatku od nieruchomości mieszkaniowych a rozwojem rynków mieszkaniowych w miastach wojewódzkich w latach 2007–2013. W pierwszej części artykułu dokonano analizy dynamiki zmian wysokości uchwalanych stawek podatku od nieruchomości. Następnie dokonano oceny poziomu rozwoju rynków mieszkaniowych oraz uporządkowania liniowego przy wykorzystaniu względnego współczynnika poziomu rozwoju. Z kolei, w celu uchwycenia zbieżności oraz jednakowych tendencji na rynkach mieszkaniowych pogrupowano miasta w grupy jednorodne. Ostatnim etapem analizy była ocena istotność wpływu wysokości uchwalanych stawek podatku od nieruchomości mieszkaniowych na rozwój rynków mieszkaniowych. Uzyskane wyniki wykazały brak statystycznie istotnej zależności pomiędzy badanymi zjawiskami tzn. brak wpływu wysokości uchwalonych przez rady miast wysokości stawek na podejmowane przez inwestorów decyzje na rynku mieszkaniowym.

16

Heat transfer in plate heat exchanger channels: Experimental validation of selected correlation equations

88%

Cieśliński J. T. , Fiuk A. , Typiński K. , Siemieńczuk B.

Archives of Thermodynamics

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2016

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tom Vol. 37, no. 3

19--29

EN

This study is focused on experimental investigation of selected type of brazed plate heat exchanger (PHEx). The Wilson plot approach was applied in order to estimate heat transfer coefficients for the PHEx passages. The main aim of the paper was to experimentally check ability of several correlations published in the literature to predict heat transfer coefficients by comparison experimentally obtained data with appropriate predictions. The results obtained revealed that Hausen and Dittus-Boelter correlations underestimated heat transfer coefficient for the tested PHEx by an order of magnitude. The Aspen Plate code overestimated heat transfer coefficient by about 50%, while Muley-Manglik correlation overestimated it from 1% to 25%, dependent on the value of Reynolds number and hot or cold liquid side.

17

Strangeness conservation and pair correlations of neutral kaons with close momenta in inclusive processes

88%

Lyuboshitz V. , Lyuboshitz V.

Nukleonika

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2006

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tom Vol. 51,suppl.3

69-72

EN

The phenomenological structure of inclusive cross sections of the production of two neutral K-mesons in collisions of hadrons and nuclei is investigated taking into account the strangeness conservation in strong and electromagnetic interactions. The relations describing the dependence of the correlations of two short-lived and two long-lived neutral kaons KS0KS0, KL0KL0 and the correlations of “mixed” pairs KS0KL0 at small relative momenta upon the space-time parameters of the generation region of K0- and (anti)K0-mesons, which involve the contributions of Bose-statistics and S-wave strong final-state interaction, have been obtained. It is shown that under the strangeness conservation the correlation functions of the pairs KS0KS0 and KL0KL0, produced in the same inclusive process, coincide, and the difference between the correlation functions of the pairs KS0KS0 and KS0KL0 is conditioned by the production of the pairs of non-identical neutral kaons K0(anti)K0.

18

Quantitative Evidence for Direct Effects Between Earth-Ionosphere Schumann Resonances and Human Cerebral Cortical Activity

88%

Saroka K. S. , Persinger M. A.

International Letters of Chemistry, Physics and Astronomy

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2014

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tom Vol. 20, iss. 2

166--194

EN

The multiple quantitative similarities of basic frequencies, harmonics, magnetic field intensities, voltages, band widths, and energetic solutions that define the Schumann resonances within the separation between the earth and ionosphere and the activity within the human cerebral cortices suggest the capacity for direct interaction. The recent experimental demonstration of the representations of the Schumann resonances within the spectral densities of normal human quantitative electroencephalographic (QEEG) activity suggests a casual interaction. Calculations supported by correlations between amplitudes of the global Schumann resonances measured several thousands of km away (which were nearly identical to our local measurements) and the coherence and current densities or these frequency bands between cerebral hemispheres for a large population of human QEEG measures indicate that such interaction occurs. The energies are within the range that would allow information to be exchanged between cerebral and Schumann sources. The near-identical solution for current density from the increasing human population and background vertical electric fields suggests that changes in the former might determine the degree of coherence between the Schumann resonances. Direct comparisons of local Schumann measurements and brain activity exhibited powerful intermittent coherence within the first three harmonics. Implications of the contributions of solar transients, surface temperature, and rapidly developing technologies to modify the ionosphere‟s Schumann properties are considered.

19

Effect of austenitizing parameters on dissolution of carbides in gamma solution and chemical composition of matrix in the hardened steel of 2% C and 12% Cr type with additives of W, Mo, V

88%

Nykiel T. , Hryniewicz T.

Advances in Materials Science

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2003

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tom Vol. 3, nr 2(4)

49--60

EN

The NCWV/D3 tool steel was the subject of the study. In the course of the investigation carried out it was found that during austenitizing of the steel the carbides contents decreased from 24.84 wt% in the annealed state down to 13.33 wt% after austenitiz-ing at 1150 °C during 30 minutes. It was also stated that the carbides contents in the quenched steel after austenitizing in the temperature range from 900 to 1150 °C during 30 minutes may be determined from the relationship cb[wt%] = 28.60 - 0,46e 0.003T Dissolution of carbides during austenitizing brings about the increase of elements Cr, W, and V contents in austenite up to 7.27%, 1.06%, and 0.086%, respectively, after austenitizing at 1150 °C during 30 minutes. It was also noticed that there is a rectilinear correlation between the contents of dissolved carbides in austenite and the contents of Cr and W in matrix of the tool steel quenched after austenitizing in the temperature range from 900 to 1150 °C and constant time of 30 minutes.

20

Assessment of cereal seed shape with the use of sphericity factors

88%

Kaliniewicz Z. , Biedulska J. , Jadwisieńczak B.

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2015

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tom nr 18(4)

237--246

EN

Shape is one of the key discriminating factors in seeds. It plays a major role in seed cleaning and sorting, and it influences the bulk behavior of seeds. The shape of seeds can be described with the use of sphericity factors. In this study, the thickness, width, length and mass of principal cereal seeds (wheat, rye, barley, oats and triticale) were determined. The geometric parameters of seeds were used to calculate five sphericity factors for each seed type. The results of measurements and calculations were processed statistically by analysis of variance, correlation analysis and linear regression analysis. In the group of the analyzed cereal seeds, the lowest values were noted for sphericity factor K5 in the range of 0.046 to 0.275, and the highest values - for sphericity factor K3 in the range of 0.359 to 0.650. The shape of cereal seeds was mostly highly correlated with: thickness in barley seeds, width in wheat seeds, width and thickness in rye and triticale seeds, and length in oat seeds. All of the analyzed sphericity factors can be used interchangeably to describe the shape of cereal seeds, and the relationships between those factors can be described with linear equations.