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Search results for: spring characteristic
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Insights into the flow characteristics during hydraulic fracturing
PublicationThis paper presents a numerical model to study fracture propagation during water-based hydraulic fracturing. To address the computational challenges associated with the numerical model, the proposed approach employs a set of overlapping spheres arranged in a monolayer to construct a porous specimen containing pre-existing cracks. The fluid-filled cracks represent various stages of initiation and propagation of fluid-driven fracture....
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Bifractal receiver operating characteristic curves: a formula for generating receiver operating characteristic curves in credit-scoring contexts
PublicationThis paper formulates a mathematical model for generating receiver operating characteristic (ROC) curves without underlying data. Credit scoring practitioners know that the Gini coefficient usually drops if it is only calculated on cases above the cutoff. This fact is not a mathematical necessity, however, as it is theoretically possible to get an ROC curve that keeps the same Gini coefficient no matter how big a share of lowest...
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Combustion characteristics and retention-emission of selenium during co-firing of torrefied biomass and its blends with high ash coal
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Characteristics of Anthropogenic Pollution in the Atmospheric Air of South-Western Svalbard (Hornsund, Spring 2019)
PublicationThe character of atmospheric pollution and its impact on surface waters may vary substantially in space, and hence, we add a potentially important location for the studies of atmospheric air pollution to the map of the High Arctic. We have investigated the anthropogenic particle characteristics and selected persistent organic pollutant concentrations, in a priorly unmonitored location in the Arctic (Svalbard), exposed to a climatic...
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Jumping Wave Characteristic during Low Plasticity Burnishing Process
PublicationDuring the low plasticity burnishing process of soft materials such as carbon steel with a hardness of up to 40 HRC (Rockwell grade) a raised structure of the material known as the Jumping Wave forms in front of the tool roll. This phenomenon significantly disturbs the burnishing process, but is very poorly described in the literature. This article presents studies of this phenomenon on the example of burnished 1.0562 steel. The...
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Effect of a characteristic length on crack spacing in a reinforced concrete bar under tension
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Effect of a characteristic length on crack spacing in a reinforced concrete bar under tension.
PublicationW artykule przedstawiono wyniki numerycznej obliczenia rozstawu rys w pręcie żelbetowym poddanemu rozciąganiu. Obliczenia wykonano przy zastosowaniu sprężysto-plastycznego modelu rozszerzonego o długość charakterystyczna mikrostruktury przy pomocy teorii nielokalnej.
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Laboratory investigations of the flow characteristics during intrapertonealperfusional chemotherapy in hyperthermia - preliminary results.
PublicationW pracy przedstawiono program laboratoryjnych badań procesu perfuzji dootrzewnowej oraz wstępne wyniki pomiarów. Omówiono konstrukcję stanowiska badawczego, analizując jego podobieństwa i różnice względem rzeczywistej jamy brzusznej człowieka. Przedstawiono orientacyjne wyniki pomiarów, pozwalające pozytywnie ocenić celowość podjętych badań.
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<p><strong><em>Navicula fontana sp. nov</em></strong><strong>., a new freshwater diatom from a limnocrenic spring in Central Poland</strong></p>
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Curing characteristics, mechanical properties and morphology of butyl rubber filled with ground tire rubber (GTR)
PublicationThe results on testing application of ground tire rubber (GTR), as potential filler for butyl rubber, are pre- sented. The GTR content variation, within the range of 10–90 phr, was studied with respect to the vulcanization process, static mechanical properties (tensile strength, elongation-at-break, hardness and resilience), dynamic mechanical properties and the morphology of the obtained vulcanizates. Butyl rubber was characterized...
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Technological features of forming the quality characteristics of the surface layer during diamond smoothing in the integrated processing
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Curing characteristics, mechanical and thermal properties of reclaimed ground tire rubber cured with various vulcanizing systems
PublicationGround tire rubber was thermo-mechanical reclaimed at 120 °C using a co-rotating twin screw extruder. The effect of vulcanizing system type on curing characteristics, static mechanical properties (tensile strength, elongation-at-break, hardness and resilience), dynamic mechanical properties and thermal properties of reclaimed ground tire rubber was investigated. Reclaimed rubber was cured using different types of vulcanization...
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Road mortality of pond-breeding amphibians during spring migrations in the Mazurian Lakeland, NE Poland
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Entrance and exit conditions of teeth during circular sawing.
PublicationW pracy przedstawiono analizę rozkładu czasowego i przestrzennego geometrycznych warunków wejścia i wyjścia ostrzy piły przy przecinaniu piłami tarczowymi.
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Characteristics of the Jerusalem Artichoke
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Characteristics of the Hydrophytes Method
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Trolleybus infrastructure characteristics
PublicationW publikacji przedstawiono nowoczesne rozwiązania infrastruktury trolejbusowej stosowane w krajach Unii Europejskiej
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Trolleybus Fleet Characteristics
PublicationW pracy przedstawiono nowoczesne rozwiązania taboru trolejbusowego stosowane w Europie
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Characteristics of Electrorheological Fluids
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Characteristics of the topology of the Internet
PublicationRozdział dotyczy charakterystyki topologii Internetu. Ukazuje zagrożenia wynikające z bezskalowego charakteru sieci. Opisuje naturę ataku - destrukcyjnego działania mającego na celu wyeliminowanie ważnego elementu sieci. Przedstawia reguły doboru tras, pozwalające ustanawiać ścieżki realizacji połączeń omijające określone węzły sieci, narażone na atak.
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The Impact of Range of Motion on Applied Force Characteristics and Electromyographic Activity during Repeated Sets of Bench Press Exercise
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An approach to determining tinnitus acoustical characteristic
PublicationFor many treatment methods, accurate estimation of Tinnitus(ringing in ears) concerning sound type, level, and bandwidth or frequency is inevitable. The proposed way of obtaining Tinnitus parameters is described in this paper. The method employs sound synthesis, aimed at obtaining sound which is closest to perceived Tinnitus. The proposed method assumes running a designed application on a multimedia PC provided with a special graphical...
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On the characteristic and stability of iron diet supplements
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On the Characteristic Graph of a Discrete Symmetric Channel
PublicationWe present some characterizations of characteristic graphs of row and/or column symmetric channels. We also give a polynomial-time algorithm that decides whether there exists a discrete symmetric channel whose characteristic graph is equal to a given input graph. In addition, we show several applications of our results.
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Characteristics of the conductivity of polyurethane nanocomposite
PublicationW opracowaniu tym przedstawiono właściwości mechaniczne oraz przewodnictwo jonowe otrzymanych nanokompozytów poliuretanowych. KOmpozyty te były otrzymane przy wykorzystaniu wytłaczarki dwuślimakowej. POddano je badaniom wytrzymałościowym, spektroskopii impedancyjnej, spektroskopii w podczerwieni oraz badaniom dynamiczno - mechanicznym (DMA)
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Rotordynamic characteristics of a chamber seal
PublicationThe paper presents the results of numerical and experimental investigations into pressure forces generated in a turbine labyrinth seal of a modernized type. The experiments were performed on a single-stage air model turbine of the impulse type. The experiments were performed on a single-stage air model turbine of the impulse type. The experimental data were compared with theoretical results obtained by means of CFD Fluent Code....
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Performance Characteristics of a Micro-Turbine
PublicationIn the paper a design of a multi-stage micro-turbine with partial admission of all the stages is described in detail and the results of particular experimental investigations and numerical calculations are shown, followed by conclusions. The co-generative micro-power plant with the HFE7100 as a working medium was designed and built for experimental investigations. The values of the main cycle parameters were as follows:heat output:...
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Third sector characteristics and importance
PublicationThis article aims to present a brief overview of existing definitions and specific characteristics of the third sector. It also highlights the basic functions of NGOs as an important institutional and organizational actor in the global political and economic landscape.
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Bioterrorism — characteristics and possibilities of prevention
PublicationIn the paper bioterrorist threats have been presented. Historical background and possible methods of attacks have been described. The most dangerous pathogens and disease entities have been classified. Selected methods of detection and identification of biological weapon have been presented. The wireless system for threats monitoring — developed at Gdansk University of Technology — has been described.
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Dynamic characteristics of interaperitoneal perfusion.
PublicationPrzedstawiono wyniki badań laboratoryjnych perfuzyjnego przepływu przez model jamy brzusznej człowieka. Szczególną uwagę zwrócono na techniczne aspekty modelu oraz wyników badań. Omówiono technikę pomiarową oraz przeanalizowano rezultaty pod kątem teorii przepływów przez zbiorniki i reaktory.
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Charakterystyka stopu Ł83 wytworzonego metodami odlewania i natryskiwania cieplnego = Characteristic of the Ł83 alloy fabricated by casting and thermal spraying methods
PublicationPrzedstawiono mikrostrukturę i twardość stopu łożyskowego Ł83 wytworzonego metodami natryskiwania cieplnego i odlewania odśrodkowego. W tym aspekcie dokonano analizy przydatności metody natryskiwania w produkcji łożysk ślizgowych.
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THE EFFECT OF WOOD DRYING METHOD ON THE GRANULARITY OF SAWDUST OBTAINED DURING THE SAWING PROCESS USING THE FRAME SAWING MACHINE
PublicationThe experimental results of the study focused on the effect of drying processes of warm air drying at the temperature of 6580°C and warm air-steam mixture drying at the temperature of 105°C of pine and beech wood to the size of sawdust grains created by cutting using RPW 15M frame saw is presented in the paper. Particle size analysis of dry sawdust was performed using two methods - screening method and optical method based on...
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Operating conditions-induced changes in product yield and characteristics during thermal-conversion of peanut shell to biochar in relation to economic analysis
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The prediction method of the shear angle in the cutting zone during wood sawing
PublicationW artykule opisano metodę przewidywania kąta ścinania w strefie skrawania dla przypadku przecinania drewna. Kąt ścinania był określany z wykorzystaniem współczesnej mechaniki pękania. Nieliniowe równanie opisujące tą wielkość było rozwiązywane numerycznie za pomocą metody iteracyjnej Newton-Raphson. Otrzymane wyniki obliczeń wykazują możliwość rozszerzenia obszaru modelowania efektów energetycznych procesu przecinania drewna nawet...
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On the characteristic impedance definition in microstrip and coplanar lines
PublicationW niniejszej pracy rozważono definicję impedancji charakterystycznej dla bezstratnych linii mikropaskowych i koplanarnych. Wykazano, że ze względu na znaczne wartości prądu przesunięcia związanego z podłużną składową pola elektrycznego, definicja impedancji staje się niejednoznaczna. W rezultacie może to przyczyniać się do istotnych błędów powstających już na etapie projektowania układów. Pokazano, iż efekt ten jest szczególnie...
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A method of nonlinearities of transformer no-load characteristic modelling
PublicationA way in which changes of the no-load characteristic are taken into account in the mathematical model of the transformer is presented. Changes of saturation within core of transformer are presented as a combined non-linear flux curve. Analysis of magnetization of the transformer core and simulation of no-load state for distribution transformer of 30 kVA power rating and 15.75/0.4 kV/kV (especially supplying VLV) transformation...
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Effect of sewage sludge properties on the biochar characteristic
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Characteristic of Injuries and Rehabilitation to Professional Rugby Players
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Influence of feed rate on the granularity and homogenity of oak sawdust obtained during the sawing process on the frame sawing machine PRW15M
PublicationOpisano wpływ prędkości posuwu na skład granulometryczny i jednorodność trocin dębowych otrzymanych podczas procesu przecinania na pilarce ramowej PRW15M. Wykazano, że otrzymane trociny mogą być wykorzystane w produkcji produktów drewnopochodnych w ilości 75% dla posuwu 0.36 m/min i 82% przy posuwie 1.67 m/min. Pozostałe trociny stanowią odpad.
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Association between mental health, psychological characteristics, and motivational functions of volunteerism among Polish and Ukrainian volunteers during the Russo-Ukrainian War
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Testing of the Superconducting Magnets Frequency Characteristics
PublicationPrzedstawiono zagadnienia związane z opracowaniem systemu do wyznaczania impedancji uzwojeń magnesów nadprzewodzących w funkcji częstotliwości. Omówiono strukturę sprzętową systemu, oprogramowanie oraz sposób wyznaczania parametrów badanego uzwojenia. Pokazano przykładowe wyniki uzyskane przy użyciu omawianego systemu w GSI w Darmstadt.
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The modyfication of the dynamic characteristics of vibratory conveyor
PublicationThe vibratory conveyors are used in the industry for continuous transportation of loose substances on distance up to 20meters. These conveyors are often suspended on expensive and massive frames, which are softly vibroisolated from the ground. As a result, they transfer significant dynamic forces on the ground. In case of 5 - 20 meter-long devices, the biggest construction problems are proper vibrations of the panel caused by bilateral...
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Performance Characteristics of a Micro-turbine, International
Publication. In the paper a design of a multi-stage micro-turbine with partial admission of all the stages is described in detail and the results of particular experimental investigations and numerical calculations are shown, followed by conclusions. The co-generative micro-power plant with the HFE7100 as a working medium was designed and built for experimental investigations. The values of the main cycle parameters were as follows:- heat...
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UNDECLARED WORK IN POLAND CHARACTERISTICS AND PREVALENCE
PublicationThis article aims to present the significance and prevalence of the phenomenon of undeclared work. First, we discuss the definitional issues of this phenomenon. Then, we present previous estimates on shadow economy and undeclared work in Poland, based on statistics provided by Central Statistical Office and other research entities. Our analysis covers the years 2000–2014. In the last part of the article, we use data from the Labour...
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SUBSOIL CHARACTERISTICS OF THE VISTULA RIVER DIKES
PublicationThe results of CPTU tests are used to determine the strength parameters of a dike subsoil. Stress state and stress history of the subsoil under the flood embankment was evaluated with CPTU and DMT tests. Normally consolidated soil was found under the central part of the dike, while the subsoil near the dike toe is found to be overconsolidated. Due to consolidation the undrained shear strength of the subsoil under the central part...
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The influence of magnetic core on frequency characteristics
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The stationarity characteristics of electrochemical current noise
PublicationPrzedstawiono rezultaty analizy szumu elektrochemicznego generowanego podczas korozji stali 0H18N9 w roztworze 0.1 M H2SO4+0,006 M Cl-. Rejestry uzyskano w warunkach potencjostatycznych. W szumie zaobserwowano trendy i sygnały przejściowe, charakterystyczne dla korozji wżerowej. Trend został usunięty za pomocą aproksymacji wielomianem trzeciego stopnia. Analiza statystyczna wykazała niestacjonarny bądź słabo stacjonarny charakter...
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Determination of CWR track's durability characteristics
PublicationW pracy przedstawiono wyniki badań nad wyznaczaniem sił osiowych w szynie kolejowej z zastosowaniem metody wymuszonych przemieszczeń poprzecznych. Badania przeprowadzone na stacjonarnym stanowisku badawczym wykazały, że siłę podłużną w szynie można znacznie dokładniej określić na podstawie zmiany nie pionowej, lecz poziomej siły poprzecznej. Pozwoliło to właściwie ukierunkować prace nad określaniem sił osiowych w szynach toru...
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Characteristic of factors influencing the proper course of folliculogenesis in mammals
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Material characteristic of an innovative stent for the treatment of urethral stenosis
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