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Tytuł:
Volodymyr Zelenskyi’s political image during the Russian-Ukrainian war: an initial analysis
Autorzy:
Trushevych, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/2128091.pdf
Data publikacji:
2022-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
political image
Volodymyr Zelenskyi
war
image
rating
President of Ukraine
Opis:
Political image is formed in the mass consciousness, and has the kind of a stereotype, emotionally colored image of a political leader. Political image has a purely integral essence and is derived from the psychological, physiological and intellectual characteristics of the leader, aimed at the object of image perception. The image of a political leader is the essence and objective unit of communicative interaction in the system «political leader – the masses». He feels the interaction of various factors, which can be conventionally referred to as communication filters. At the same time, the essence of an effective image-making process is to see and take into account these barriers in time and achieve the greatest perception of the leader’s image. The specificity of a political leader in society is that citizens usually form their ideas about politicians not as a result of direct contact with them, but on the basis of symbolic politician representation in the media. Ideology and programs as the subject basis of political communication between leaders and the masses are increasingly being replaced by the image of a politician being created and promulgated in the media. The presence of a political leader in the media occurs as a necessary condition for his positioning in the political space. The formation of the leader political image during the war helps not only to achieve the political goals of the politician himself, but also affects the course of hostilities and the availability of world community support. The article attempts to analyze the political image of the President of Ukraine Volodymyr Zelenskyi during the Russian-Ukrainian war and his influence on the war course. The author’s attention is focused on determining the image micro roles of the President, analyzing the impact of his image and rhetoric on the support of the world community and the decisions of the authorities of different countries. The author also explores how Ukrainians’ support for their president has changed since the beginning of the war. The author determines from which elements the image of a modern politician is built. Existing and additional micro roles of Volodymyr Zelenskyi image have been studied. The micro role of the President of Ukraine image among Ukrainians and at the international level is indicated. A content analysis of the President’s speeches in the British Parliament and the US Congress was performed. The impact of these speeches on the assistance to the Ukrainian army is analyzed. An increase in the level of support for the president by Ukrainians themselves since the beginning of the war has been revealed. The change in the image of the President of Ukraine among the international community and the level of support are shown.
Źródło:
Reality of Politics; 2022, 22; 81-95
2082-3959
Pojawia się w:
Reality of Politics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial Analysis of the Surface Layer of AVGI Cast Iron Subject to Abrasion
Autorzy:
Jakubus, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/2127510.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vermicular cast iron
abrasion resistance
austempering
abrasion of cast iron
surface layer
AVGI
żeliwo wermikularne
odporność na ścieranie
hartowanie
ścieralność
warstwa wierzchnia
Opis:
The article presents the results of research on the abrasion resistance of cast iron with vermicular graphite in the as-cast state and after austempering (the latter material is referred to as AVGI – Austempered Vermicular Graphite Iron). Austenitization was carried out at the temperature values of either 900°C or 960°C, and austempering at the temperature values of either 290°C and or 390°C. Both the austenitization and the austempering time was equal to 90 minutes. The change of the pearlitic-ferritic matrix to the ausferritic one resulted in an increase in mechanical properties. Abrasion tests were conducted by means of the T-01M pin-on-disc tribometer. The counter-sample (i.e. the disc) was made of the JT6500 friction material. Each sample was subject to abrasion over a sliding distance of 4000 m. The weight losses of both samples and counter-samples were determined by the gravimetric method. It was found that the vermicular cast iron austenitized at 900°C and austempered at 290°C was characterized by the lowest wear among the evaluated cast iron types. The geometric structure of the surface layer after the dry friction test exhibited irregular noticeable grooves, distinct oriented abrasion traces, plastic flow of the material, microcracks, and pits generated by tearing out the abraded material. The largest surface roughness was found for the AVGI cast iron heat-treated according to the variant 3 (Tγ =900 ºC; Tpi = 390°C), while the smallest one occurred in AVGI cast iron subject to either the variant 2 (Tγ =960 ºC; Tpi = 290°C) or the variant 4 (Tγ =900 ºC; Tpi = 290°C) of heat treatment and was equal to either 2.5 μm or 2.66 μm, respectively. It can be seen that the surface roughness decreases with the decrease in the austempering temperature.
Źródło:
Archives of Foundry Engineering; 2022, 22, 2; 50--56
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial analysis of the tracking performance of the GOOSE GNSS Software-Defined Receiver
Autorzy:
Galas, Roman
Kunzi, Florian
Adolfs, Marjolijn
Overbeck, Matthias
Felber, Wolfgang
Powiązania:
https://bibliotekanauki.pl/articles/1819198.pdf
Data publikacji:
2020
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
local ionospheric perturbations
scintillations
single autonomous GNSS monitoring station
continuously monitoring GNSS ground systems
autonomous power management
real-time processing
software-defined receiver
Opis:
The GOOSE (GNSS Receiver with open software interface) Software-Defined Receiver has been developed at the Fraunhofer Institute for Integrated Circuits (IIS) in Nürnberg, Germany. The main motivation for the development of this platform was to control the receiver at all stages, from digital signal processing to the PVT domain, and to enable controlled feedback to the hardware. Besides having access to all raw data including correlation values, the GOOSE receiver also enables for example tight- or ultra-tight integration with an inertial navigation system or other dead reckoning systems, as these kinds of architectures require access to the acquisition and tracking loops. In this paper, the tracking performance of the GOOSE platform was evaluated and compared to a reference receiver (Septentrio PolaRx5S). Several long data sessions were recorded on a “zero baseline” in which both receivers used the same precise geodetic antenna that was also developed at Fraunhofer IIS. The measurements were performed in a harsh environment (obstructions, multipath, possible interferences), as well as on a site with an unobstructed sky view. Quality and performance analyses were performed using raw measurements (in the domain of primary observables) of three civil GPS signals: L1CA, L2CM, and L5. The data were processed using the “zeroEdit” module of the TUB-NavSolutions academic software for education and research. The quality of the raw observables and tracking performance were described by the following parameters: number of cycle slips detected, number of un-correctable cycle slips, number of loss of locks of the signals, number of single epoch data gaps, and the length of carrier phase arcs. The presentation is illustrated with some numerical examples.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 63 (135); 113-120
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Time Spent by Doctors on Medical Documentation- Initial Analysis and Preliminary Study
Autorzy:
Lorkowski, Jacek
Grzegorowska, Oliwia
Powiązania:
https://bibliotekanauki.pl/articles/1194245.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
working time
medical law
medical records
patterns
templates
bureaucracy
indirect
costs
direct costs
Opis:
The aim of the article is evaluation of time needed to spend on filling medical records by Polish surgeons. An anonymous questionnaire concerning time needed to spend on creating particular parts of medical documentation affecting one patient was filled by 80 doctors (40 specialists and 40 residents). 100% of respondents stated that the time spent on medical records is excessive. In the whole study the group time spent on records of one patient was as follows: without patterns and medical secretary 75.62 min (SD 7,4), with patterns – 53.3 min (SD 6.8), with help of medical secretary 36.72 min (SD 5.1). Results in the resident group were as follows: without patterns and medical secretary 110 min (SD 12.4), with patterns – 69.87 min (SD 9.4), with help of medical secretary 46.15 min (SD 6.5). In conclusion, taking legal, formal and logistics measures, could help to reduce the time spent on administrative procedures while generating medical documentation.
Źródło:
Edukacja Ekonomistów i Menedżerów; 2020, 58, 4
1734-087X
Pojawia się w:
Edukacja Ekonomistów i Menedżerów
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying AIM-9X on MiG-29 : Initial Analysis of MiG-29 Weapon System Modernizations
Autorzy:
Grzesik, N.
Powiązania:
https://bibliotekanauki.pl/articles/403741.pdf
Data publikacji:
2012
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
mechanical engineering
aviation
guided missile
missile launcher adapter
mechanic and electric adaptations
Opis:
Author, in this article, describes technical realizability of assembly AIM-9X missile on MiG-29, gives also in the introduction information about aircraft modernizations necessity. Second and third part of the article consist of technical, physical and operating data of AIM-9X air to air missile, LAU-129A/A missile launcher and missile launcher adapter. Fourth part contains mechanical and electric adaptations. Fifth part includes description of weapon control system and blocks locations. Conclusions end the publication. This article is integral part of author’s scientific research and cooperation with Armament Market Analyzing Office of Ministry of Defense.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2012, 3, 1 (7); 83-90
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The initial analysis of the aerodynamic characteristics of a 3D printed model of an aircraft
Autorzy:
Lusiak, T.
Babel, R.
Powiązania:
https://bibliotekanauki.pl/articles/246283.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
air transport
simulation
wind tunnel
experimental analysis
gyroplane
Opis:
The aerodynamic research into models of an aircraft aims at creating the main characteristics of aerodynamic forces and moments and the aerodynamic characteristics of coefficients of aerodynamic forces and moments, based on real dimensions. The method of 3D printing was used to create a model of an aircraft. The model with the previously set printing parameters and commands for a 3D printer, in the right order, was imported into MakerBot Print. The final stage was printing the model. The printed components of the model of an aircraft were imperfect due to the incorrectly set printing parameters. The model with the previously set printing parameters and commands for a 3D printer, in the right order, was imported into MakerBot Print. The final stage was printing the model. The printed components of the model of an aircraft were imperfect due to the incorrectly set printing parameters. The printing parameters were corrected in the next printing sessions so the surfaces of the components were good enough and grinding was unnecessary. Some excess material was removed in each of the printed components, and the slots were cleaned. Then, the individual models were put together. The article describes the technique of creating a model of an aircraft to map its exact geometry for experimental wind tunnel research. 3D printing enables us to experimentally investigate a created geometry, in particular to investigate further prior to releasing an aircraft to service. The 3D model employs the model created in line with the previous CFD analysis.
Źródło:
Journal of KONES; 2018, 25, 4; 255-262
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial Analysis of Helicopter Impact on Hospital Helipads
Wstępna analiza oddziaływania na otoczenie śmigłowców na lądowiskach przyszpitalnych
Autorzy:
Krzymień, Wiesław
Cieślak, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/36406803.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
helipads
helicopter noise
ground tests
lądowiska wyniesione
hałas śmigłowca
badania naziemne
Opis:
The need to quickly provide assistance to victims of accidents or seriously ill has created the need for the construction of helipads at selected hospitals. Their operation and the conditions of use are governed by regulation of the Ministry of Health on Hospital Emergency Ward (SOR) and rules required by the Civil Aviation Authority. The direct vicinity of the helipads causes impact of landing and departing helicopters on buildings, people and hospital equipment as well as the construction of the airfield. This article presents vibroacoustic impact of helicopters on helipads’ measurement methods and the results of the preliminary measurements to estimate the impact of Helicopter Air Rescue (LPR) on adjacent buildings and surroundings.
Potrzeba szybkiego udzielania pomocy poszkodowanym w wypadkach lub ciężko chorym stworzyło potrzebę budowy lądowisk przy wybranych szpitalach - ich działanie i warunki eksploatacji reguluje Rozporządzenie MZ w sprawie szpitalnego oddziału ratunkowego (SOR) oraz przepisy wymagane przez Urząd Lotnictwa Cywilnego. Bezpośrednie sąsiedztwo lądowisk powoduje oddziaływanie lądujących i startujących śmigłowców na budynki oraz na ludzi i sprzęt szpitalny a także na konstrukcję lądowiska. W artykule przedstawiono czynniki oddziaływania wibroakustycznego śmigłowców na lądowiskach wyniesionych, metody pomiarowe oraz wyniki wstępnych pomiarów mające na celu oszacowanie wpływu śmigłowców Lotniczego Pogotowia Ratunkowego (LPR) na sąsiadujące budynki i otoczenie.
Źródło:
Transactions on Aerospace Research; 2019, 3 (256); 14-23
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial numerical analysis of a small electric vehicle
Autorzy:
Kącki, J.
Augustynowicz, A.
Prażnowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/245031.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibrations
car chassis
finite element method
dynamic modelling
suspension
Opis:
This article presents a concept of a two-seat urban electric vehicle, whose model was developed in the FEM Nastran-in-Cad software. The performed simulations formed an optimization tool applied for the purpose of a study involving the distribution of the vehicle mass and its impact on the strength parameters of the body. The study focuses on the impact of the vertical road characteristics on the stress transferred through the vehicle’s body throughout drive conditions. In addition, a quasi-static analysis was performed with regard to the deformation of the load-bearing elements resulting from external impact forces with various magnitude and contact angle. In the article, the authors focused on the study of the impact of vertical road characteristics on the stress that is transferred through the vehicle body, as it occurs in driving conditions. The simulations presented in the article focus on the procedures applied during the analytical and numerical analysis with the purpose of developing an environment to test the structural components of the vehicle in terms of its response to vertical road roughness. The analysed system examined the impact of the road surface on the occurrence of stress and displacement in the structure of the body of the designed vehicle.
Źródło:
Journal of KONES; 2017, 24, 2; 107-116
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pozyskiwanie i wstępna analiza wielospektralnych danych satelitarnych do celów rozpoznawania hydrometeorów
Acquisition and initial analysis of multispectral satellite data for recognition of hydrometeors
Autorzy:
Jasiński, J.
Kroszczyński, K.
Pietrek, S.
Winnicki, I.
Powiązania:
https://bibliotekanauki.pl/articles/209949.pdf
Data publikacji:
2011
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
meteorologia
wielospektralne dane satelitarne
hydrometeory
meteorology
multispectral satellite data
hydrometeors
Opis:
Na Wydziale Inżynierii Lądowej i Geodezji Wojskowej Akademii Technicznej działa system odbioru cyfrowych meteorologicznych danych satelitarnych, które wykorzystywane są do prowadzenia wielospektralnych analiz dla potrzeb określenia właściwości hydrometeorów. Artykuł przedstawia wyniki wstępnych analiz zobrazowań satelitarnych pozyskiwanych w kilku kanałach spektralnych w powiązaniu z opracowanym przez autorów oprogramowaniem do łącznego przetwarzania danych satelitarnych i danych z mezoskalowych numerycznych modeli prognoz pogody.
Meteorological satellite data reception system run at the Faculty of Civil Engineering and Geodesy of the Military University of Technology provides digital data that enables multispectral analyses for determining the properties of hydrometeors. The paper presents initial elements of analyses of satellite imagery received in a few spectral channels in relation with software developed at the Faculty for combined processing of satellite data and data of mesoscale numerical weather forecasting models.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 3; 185-195
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Academic Discipline at a Crossroads. The Different Approaches to Teaching Literature in Warsaw and in Vilnius in the years 1811‒1830 — an Initial Analysis
Autorzy:
Markowska, Helena
Powiązania:
https://bibliotekanauki.pl/articles/579294.pdf
Data publikacji:
2016
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
University of Warsaw
Vilnius University
literary studies
literary criticism
comparative studies
comparative literature
Opis:
The article’s goal is to reflect on the perception of literary studies as an academic discipline in the 19th century Poland in the twenties and the thirties. The answer to this question may be found in lectures given in that time period at the University of Warsaw and at Vilnius University. The author analyzes excerpts of works by L. Borowski, E. Słowacki, L. Osiński and K. Brodziński in which they define the object of their studies and extrapolate on their methodological tenets. The analysis concludes with an attempt at defining the foremost tendencies in Polish literary studies of the time period, especially in regards to the relationship between the history of literature, literary theory and literary criticism.
Źródło:
Zagadnienia Rodzajów Literackich; 2016, 59/120 z. 4; 35-46
0084-4446
Pojawia się w:
Zagadnienia Rodzajów Literackich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Legislation in the Czech Republic in 2014 – a quantitative overview
Ustawodawstwo w Republice Czeskiej w 2014 roku – analiza ilościowa
Autorzy:
Novák, František
Powiązania:
https://bibliotekanauki.pl/articles/2006887.pdf
Data publikacji:
2016
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
statistical descriptive analysis
initial analysis
quantitative
description of the legislation
opis statystyczny
analiza wstępna
ilościowy opis
ustawodawstwa
Opis:
This study aims at presenting the results of a basic statistical description and initial analysis of the legislation in the Czech Republic in 2014. It offers a fundamental quantitative description of the composition of Czech legislation, particularly its formal typology and structure, including the sector structure and the information about fundamental changes in this structure as they occurred in 2014.
Celem niniejszego opracowania jest prezentacja wyników podstawowego opisu statystycznego i wstępnej analizy ustawodawstwa Republiki Czeskiej w roku 2014. Przedstawiony został opis ilościowy ustawodawstwa czeskiego, zwłaszcza jego formalnej typologii i struktury, w tym struktury sektorowej oraz informacje dotyczące zasadniczych zmian w tej strukturze zaistniałych w 2014 roku.
Źródło:
Krytyka Prawa. Niezależne Studia nad Prawem; 2016, 8, 2; 102-125
2080-1084
2450-7938
Pojawia się w:
Krytyka Prawa. Niezależne Studia nad Prawem
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The initial analysis of the ability for the generative propagation and the level of self-incompatibility of inbred lines of Chinese cabbage (Brassica rapa ssp. pekinensis)
Autorzy:
Kaminski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2089.pdf
Data publikacji:
2013
Wydawca:
Instytut Ogrodnictwa
Tematy:
Chinese cabbage
Brassica rapa var.pekinensis
seed development
self-incompatibility
generative propagation
inbred line
Źródło:
Journal of Horticultural Research; 2013, 21, 2
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial analysis of the accuracy of position determination using ASG-EUPOS NAVGEO (RTK VRS) service
Wstępna analiza dokładności wyznaczania pozycji przy wykorzystaniu serwisu ASG-EUPOS-NAVGEO (RTK VRS)
Autorzy:
Uradziński, M.
Doskocz, A.
Powiązania:
https://bibliotekanauki.pl/articles/385380.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
GNSS
ASG-EUPOS
pomiary RTK
RTK technique surveying
Opis:
ASG-EUPOS system, as a part of Project EUPOS (European Position Determination System), is a new multifunctional system of precise satellite positioning in Poland. It makes GNSS corrections and raw observations collected at 116 reference stations accessible to the users, what provides precise real time positioning, post-processing and supports navigation in the whole area of Poland. This new system, which is based on reference stations network including EUREF-POL, POLREF and EUVN points, accomplishes ETRF89 reference system. One of the most accurate real time positioning services provided by ASG-EUPOS is NAVGEO service, which is RTK VRS network solution. It enables streaming of RTCM corrections for mobile users by using the latest mobile communication technologies such as GPRS or UMTS in any area covered by a cell-phone network. Noting great potential of RTK technique (enabling positioning to centimeter accuracy), authors decided to put NAVGEO service into test as a potential tool for map and geographical databases updating. Our approach of testing the performance of this service is based on field experiments and the analysis of both the accuracy and availability of RTK data using mobile wireless transmissions. We investigate the advantages and disadvantages of this service. Experiments were conducted on the test marks which were determined by static occupation (below centimeter level of accuracy) under different conditions (opened areas and covered by trees and buildings). All the tests were performed in the various periods of time using the latest Topcon HyperPro GPS/GLONASS receivers.
System ASG-EUPOS, stanowiący część projektu EUPOS (European Position Determination System), jest nowym wielofunkcyjnym systemem precyzyjnego satelitarnego pozycjonowania w Polsce. ASG-EUPOS udostępnia użytkownikom poprawki GNSS i surowe obserwacje rejestrowane przez 116 stacji referencyjnych, co zapewnia: precyzyjne pozycjonowanie w czasie rzeczywistym, postprocessing i wspomaga nawigację na całym obszarze kraju. W skład systemu ASG-EUPOS weszły punkty wcześniej zrealizowanych sieci: EUREF-POL, POLREF oraz EUVN zapewniające praktyczną realizację układu ETRF89 w Polsce. Jednym z serwisów zapewniającym pozycjonowanie w czasie rzeczywistym z najwyższą dokładnością jest serwis NAVGEO, który wykorzystuje technikę RTK VRS (Virtual Reference Station). Serwis NAVGEO udostępnia poprawki w formacie RTCM użytkownikom przy wykorzystaniu najnowszych technologii telekomunikacyjnych takich jak GPRS, UMTS bądź G3 na obszarze pokrycia sygnałem sieci telefonii komórkowych. Zważywszy na ogromny potencjał techniki RTK, zapewniającej centymetrową dokładność wyznaczania pozycji, autorzy zdecydowali się na przeprowadzenie testów w zakresie jej wykorzystania do tworzenia i aktualizacji baz danych map cyfrowych. Przeprowadzone testy działania serwisu NAVGEO oparto na pomiarach terenowych. Następnie wyniki pomiarów poddano analizie zarówno w zakresie dokładności pozycjonowania techniką RTK, jak i dostępności poprawek przesyłanych z wykorzystaniem transmisji bezprzewodowej. Eksperymenty pomiarowe przeprowadzono na lokalnej sieci testowej 30 punktów pomiarowych, których współrzędne wzorcowe wyznaczono techniką pomiarów statycznych z dokładnością milimetrową. Punkty pomiarowe zlokalizowano w różnych warunkach terenowych: otwarta przestrzeń (pełna dostępność sfery niebieskiej), tereny zadrzewione oraz w sąsiedztwie budynków. Pozycjonowanie techniką RTK wykonano w dwóch sesjach pomiarowych, przed wegetacją drzew oraz z występującymi już liśćmi na koronach drzew, przy wykorzystaniu najnowszych odbiorników Topcon HyperPro GNSS.
Źródło:
Geomatics and Environmental Engineering; 2010, 4, 4; 113-118
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie systemu MES ANSYS® AUTODYN® do analizy zbiornika specjalnego
Taking computer physics to the initial analysis of the special container with the use of the ANSYS® AUTODYN® system
Autorzy:
Flis, L.
Powiązania:
https://bibliotekanauki.pl/articles/386853.pdf
Data publikacji:
2008
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
ANSYS Autodyn
zbiornik specjalny
eksplozja
ANSYS® AUTODYN®
special container
destruction
Opis:
W artykule przedstawiono próbę symulowania przebiegu destrukcji zbiornika przeznaczonego do transportu materiałów wybuchowych po eksplozji w jego wnętrzu. Przedstawiono cele do osiągnięcia i możliwości ich zrealizowania. Zaprezentowano wstępne wyniki symulacji komputerowej niszczenia zbiornika specjalnego. Określono wytyczne do dalszej pracy, szczególnie pod kątem weryfikacji wyników symulacji. Do zadań symulacyjnych wykorzystano najnowsze oprogramowanie (obliczenia explicit) ANSYS® AUTODYN® dedykowane dla zadań dynamiki nieliniowej.
In the article the initial approach of the author was showed to simulate the destruction course of the container intended to the explosives transportation after the explosion into his interior. The aims were presented in reaching them and possibilities of their realizing. Initial results of the computer simulation of the destruction of the special container were described. One qualified guidelines to the further work especially considering the validation of simulation results. To stimulatory subjects one used the latest software of the explicit type ANSYS® AUTODYN® dedicated for assignments of the non-linear dynamics.
Źródło:
Acta Mechanica et Automatica; 2008, 2, 1; 21-26
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępna analiza wpływu wybranych czynników zewnętrznych i parametrów eksploatacyjnych transportowego samolotu odrzutowego na zużycie paliwa
Impact of selected environmental and flight data parameters on fuel consumption of the jet transport aircraft – initial analysis
Autorzy:
Sklorz, R.
Puzio, Ł.
Brodny, J.
Powiązania:
https://bibliotekanauki.pl/articles/113023.pdf
Data publikacji:
2017
Wydawca:
STE GROUP
Tematy:
transportowy samolot odrzutowy
zużycie paliwa
parametry lotu
fazy lotu
jet transport aircraft
fuel consumption
flight data parameters
flight phases
Opis:
Celem wszystkich przedsiębiorstw jest osiągniecie jak najwyższej efektywności ekonomicznej. Dotyczy to także przewoźników lotniczych. Jednym z obszarów, w którym istnieją możliwości poprawy tej efektywności jest zmniejszenie kosztów eksploatacji posiadanych środków technicznych, głównie samolotów. W tym zakresie oczywistym wydaje się zmniejszenie zużycia paliwa przez samoloty. Aby w procesie tym osiągnąć zadowalające wyniki konieczne jest zidentyfikowanie czynników zewnętrznych oraz parametrów eksploatacyjnych mających największy wpływ na to zużycie. W artykule przedstawiono wstępną analizę wpływu tych wielkości na zużycie paliwa transportowego samolotu odrzutowego. W tym celu dokonano analizy poszczególnych faz lotu samolotu z uwzględnieniem czynników mających najistotniejszy wpływ na zużycie paliwa. Przedstawiono także najważniejsze parametry pracy samolotu rejestrowane w czasie jego lotu oraz dokonano wstępnej analizy ich wpływu na zużycie paliwa. Przedstawione opracowanie należy potraktować jako wstępne do bardziej zaawansowanych analiz optymalizacyjnych zużycia paliwa w samolotach odrzutowych.
Every enterprise aims at maximizing economic yield, including air carrier enterprises. Optimization of direct operating costs related to aircraft operation is a key contributor to economic yield. Fuel consumption constitutes the biggest single direct operating cost for all air carriers, therefore its optimization is of utmost importance. Identification of environmental factors and flight data parameters affecting it is crucial. This article presents initial analysis of selected environmental factors and flight data parameters influencing fuel consumption for distinctively selected flight phases. Analysis given below should be treated as preliminary, giving introduction to the more advanced elaborations.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2017, 6, 6; 209-221
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępne badania speleomykologiczne w odkrytej kopalni w Srebrnej Górze
Initial speleomycological analysis of a newly dicovered mine in Srebrna Góra (Lower Silesia, Poland)
Autorzy:
Pusz, W.
Kita, W.
Grzeszczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/122133.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
speleomykologia
grzyby owadobójcze
historyczna kopalnia
Srebrna Góra
speleomycology
entomopathogenic fungi
historical mine
Opis:
Pojęcie „speleomykologia” zostało użyte przez autorów w literaturze światowej po raz pierwszy w roku 2014. Oznacza ono całość badań naukowych mających na celu poznanie mykocenozy jaskiń i innych obiektów podziemnych (sztolnie, kopalnie, bunkry, tunele itp.). Speleomykologia obejmuje badania składu gatunkowego oraz liczebności zarodników i innych organów tworzących kolonie grzybów zasiedlających skały, wodę, powietrze, a także obecną w jaskiniach materię organiczną (Pusz i in., 2014). Celem wstępnych badań speleomykologicznych prowadzonych w odkrytej kopalni w Srebrnej Górze była ocena zanieczyszczenia mikrobiologicznego powietrza – zarówno przez grzyby i ich zarodniki oraz inne mikroorganizmy.
Speleomycology is a new scientific branch of mycology concentrating on research of fungi present in caves and other underground objects such as adits, mines, bunkers, tunnels, etc. The aim of this preliminary study was to examine a newly discovered mine in Srebrna Góra. Initial aeromycological analysis has been conducted. Also, presence of entomopathogenic fungi was surveyed in terms of colonies count and their biodiversity. Both aeromycological analysis and survey concerning entomopathogenic fungi showed that cosmopolitan and non-specific fungi species were present in the underground object. It is worth noting that many of the found fungi might be present in the hypogean environment due to being brought there by the explorators.
Źródło:
Hereditas Minariorum; 2015, 2; 175-176
2391-9450
2450-4114
Pojawia się w:
Hereditas Minariorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of Mortality Changes in Selected European Countries in The Period 1960-2006
Autorzy:
Denkowska, Sabina
Papież, Monika
Powiązania:
https://bibliotekanauki.pl/articles/465830.pdf
Data publikacji:
2010
Wydawca:
Główny Urząd Statystyczny
Tematy:
mortality
graduated initial rate of mortality cluster analysis
Opis:
Demographic changes which took place in the 20th century clearly reveal progressive ageing of whole societies. This phenomenon influences the risk connected with calculating the products of insurance companies and pension funds, where calculated mortality is one of the most important factors. The paper presents the analysis of mortality changes in male and female populations in selected countries from Central Europe (the Czech Republic, Hungary, Poland and Slovakia) and from Western Europe (France, Italy, Spain and Sweden) in the period 1960-2006. The analysis of the mortality changes has been carried out with the use of variables proposed in 2007 by J. P. Morgan in his work Life Metrics - A toolkit for measuring and managing longevity and mortality risks. The data used for the analysis have been obtained from www.mortality.org. The van Broekhoven algorithm has been applied for smoothing crude mortality rates across different ages. The analysis of mortality changes in selected European countries in the period 1960-2006 has shown considerable differences in the changes of initial mortality rate. Apart from obvious differences in male and female mortality, significant differences in the dynamics of mortality between Western and Central European countries were revealed. The most significant differences in the change of graduated initial mortality rate have been observed for people above 40-45 from Central and Western European countries. The period of most striking disproportions in the change of graduated initial mortality rate were the years 1970-1990, which seems to be the result of the socioeconomic policy in Central European countries.
Źródło:
Statistics in Transition new series; 2010, 11, 3; 136-157
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adult education: A critical analysis of initial assessment procedures in community learning in the United Kingdom
Autorzy:
Zychowicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2194698.pdf
Data publikacji:
2022-12-30
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
adult and community education
initial assessment
Language Literacy Numeracy
needs analysis
Opis:
This article aims to examine and make recommendations to the initial assessment procedures in Adult Education context in the United Kingdom. Teachers and learners are constantly making opinions about their development, and formative assessment is one of the tools used to recognise it. In Adult Education, in addition to formative assessment, learners are expected to undergo initial assessment, testing their level of knowledge/abilities in Language, Literacy or Numeracy. Within the Adult Education context, there are several initial assessment methods available. However, it is the providers who decide which methods are most appropriate for their learners, as different methods may be appropriate in different areas. This research project focuses on an Adult Education provider based in the Midlands, United Kingdom, and offers findings that test and sometimes refute the current theory about initial assessment. Two research methods were employed to achieve the aim and objectives. Firstly, secondary data was researched. Secondly, the qualitative primary data was collected using in-depth focus groups. The research included both practitioners and learners who either conducted or experienced needs analysis processes in the adult learning context. The findings and recommendations of this article propose the use of a more ethical and reliable way of conducting initial assessment in the Adult and Community Learning context.
Źródło:
Kultura-Społeczeństwo-Edukacja; 2022, 22, 2; 55-71
2300-0422
Pojawia się w:
Kultura-Społeczeństwo-Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of initial and boundary conditions influence on the crew of tracked vehicle and the ground
Autorzy:
Barnat, W.
Panowicz, R.
Niezgoda, T.
Dybcio, P.
Powiązania:
https://bibliotekanauki.pl/articles/243703.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
hull design
tracked vehicle
Opis:
The problem of vehicle's impact resistance is broadly discussed in many articles and standardizations concerning special structures. In this paper, the numerical analysis results of an armoured vehicle loaded with blast wave are presented. Effects of ground proximity such as wave reflection are also taken into account. What is more, the tracking system was also included in calculations. The ground was modelled using Mie-Grüneisen equation of state. In the research an ALE coupling algorithm was used to model interaction between fluid (Euler domain) and structure (Lagrange domain). Euler description is used for air and blast wave propagation modelling, whereas structure is described by Lagrange equations of mass, momentum and energy conservation. The ALE coupling algorithm is implemented in MSC Dytran software. The problem was solved using explicit integration of movement equations over time. The research showed that ground and wheels considerably affect the simulation results. The pressure impulse on the vehicle's bottom increased by 40 per cent compared to the model in which these effects were not considered. Furthermore, the quality of the results increased as the solution obtained is more physical. Proposed method is a useful tool in hull design process. As well as that, the method will be further developed to include more detailed model of the vehicle.
Źródło:
Journal of KONES; 2011, 18, 1; 31-38
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the calcium sulfate hemihydrate content by regression analysis using the initial setting time
Autorzy:
Li, Bing
Powiązania:
https://bibliotekanauki.pl/articles/231074.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gips
modyfikacja
czas wiązania
analiza regresji
hemihydrat siarczanu wapnia
gypsum
modification
setting time
regression analysis
calcium sulfate hemihydrate
Opis:
In this paper, we randomly select 75 sets data of calcium sulfate hemihydrate (CSH) content and initial setting time, and the traditional test method of CSH and analyses initial setting time was used by complexometric titration. So the close relationship between them was studied in depth, which classification fitting data to be analyzed by regression analysis. The result shows that this regression analysis method can accurately determine CSH content in modified industrial by-product gypsum. The determination method has the advantages of simplification and rapid operation. As well as, the XRF quantitative analytical method was used to test the CSH content, which verified the accuracy of regression analysis method. The results also show that this method has high accuracy, and can simplify the traditional experimental process. The method developed is easier and more convenient and has broad prospects in application.
Źródło:
Archives of Civil Engineering; 2020, 66, 2; 421-437
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Thinking in Initial Teacher Education: Secondary Data Analysis from Ahelo GS Feasibility Study in Slovakia
Autorzy:
Šukolová, Denisa
Nedelová, Magdaléna
Powiązania:
https://bibliotekanauki.pl/articles/1997815.pdf
Data publikacji:
2017-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
critical thinking
initial teacher education
assessment
development
Opis:
The study presents a secondary analysis of the “Assessment of Higher Education Learning Outcomes, Generic Skills Strand”, the international study of critical thinking skills (OECD, 2012). National secondary analyses include a comparison of student teachers (n = 110) and students of other study programmes (n = 413) in critical thinking and investigates a potential relation of contextual characteristics with their critical thinking performance. Performance Task and Multiple Choice Questions were used to measure critical thinking skills and a Contextual Questionnaire was used to collect socio-demographic data, and subjectively evaluated characteristics related to test-taking motivation and coursework. The main results showed that student teachers scored lower in critical thinking performance than students of other study programmes.
Źródło:
The New Educational Review; 2017, 49; 19-29
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the material’s stiffness on stress-shielding in osseointegrated implants for bone-anchored prostheses: a numerical analysis and initial benchmark data
Autorzy:
Prochor, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/27324152.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Young’s modulus
bone mass
bone remodelling
osseointegration
bone-anchored prosthesis
moduł Younga
masa kostna
przebudowa kości
osteointegracja
proteza zakotwiczona w kości
Opis:
This study attempted to establish the link between design of implants for bone-anchored prostheses and stress-shielding, affecting the stability of the bone-implant coupling using numerical approach. The objectives were to share a numerical model capable to evaluate the long-term stability of implants and to use this model to extract data sets showing how shape and material stiffness of threaded, press-fit and modular press-fit implants affect stress-shielding intensity. Methods: Three designs were considered: threaded, press-fit and modular press-fit. The effect of shape and material stiffness of each design on stress-shielding intensity was assessed using Young’s modulus (10 to 210 GPa). Furthermore, the impact of the diameter of percutaneous part (10 to 18 mm) and thickness of medullar part (5 to 1 mm) was investigated for the modular press-fit implant. Results: The threaded design generated 4% more bone mass loss at the distal femur but an overall loss of bone mass was by 5% lower to press-fit design. The influence of Young’s modulus on bone mass changes was noticeable for modular press-fit implant, depending on diameter of percutaneous or medullary part. A 20 GPa change of stiffness caused a bone mass change from 0.65% up to 2.45% and from 0.07% up to 0.32% for percutaneous parts with 18 mm and 10 mm diameter, respectively. Conclusions: Results suggested that threaded implant provides greater stability despite an increased bone loss at the distal femur. Altogether, this work provided an initial model that could be applied in subsequent studies on the long-term stability of current and upcoming implants.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 2; 69--81
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of initial geometrical imperfections in stability analysis of thin-walled structures
Modelowanie początkowych imperfekcji geometrycznych w zagadnieniach stateczności konstrukcji cienkościennych
Autorzy:
Rzeszut, K.
Garstecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/279456.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
stability analysis
initial geometric imperfections
thin walled beams
stability of cold-formed bars
Opis:
Imperfections are modeled using actual values measured in situ. The method proposed in the paper is based on the concept of developing the imperfections in series of eigenmodes, using a limited number of most critical eigenmodes. Error minimization of this representation is performed. The method is applied to the nonlinear stability analysis of structures made of steel thin-walled cold-formed sigma profiles. FEM with shell elements and the Riks method are used. Numerical examples illustrate the influence of initial imperfections on post buckling behavior of structures.
W pracy przedstawiono metodę modelowania początkowych imperfekcji geometrycznych na podstawie rzeczywistych imperfekcji pomierzonych "in situ". Zaproponowana metoda polega na automatycznym tworzeniu sygnału imperfekcji w postaci serii funkcji własnych uzyskanych z liniowej analizy stateczności. Do modelowania imperfekcji użyto niewielkiej liczby najbardziej niekorzystnych postaci własnych. Efektywność metody analizowano ze względu na liczbę punktów pomiaru oraz sposób ich rozmieszczenia na długości pręta, minimalizując błąd aproksymacji. W dalszej części pracy, propopnowana metoda została zastosowana do nieliniowej analizy stateczności z uwzględnieniem imperfekcji prętów cienkościennych typu "Sigma". Do rozwiązania problemu nieliniowej analizy stateczności zastosowano metodę Riks'a. Przykłady numeryczne ilustrują wpływ początkowych imperfekcji geometrycznych na pokrytyczne zachowanie konstrukcji.
Źródło:
Journal of Theoretical and Applied Mechanics; 2009, 47, 3; 667-684
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complementary analysis of the initial value problem for a system of o.d.e. modelling the immune system after vaccinations
Autorzy:
Foryś, Urszula
Żołek, Norbert
Powiązania:
https://bibliotekanauki.pl/articles/1208222.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
VT-complex
antibody
antigen
B-cell
plasma cell
stationary state
stability
ordinary differential equations
lymphocyte
phase space
Opis:
Complementary analysis of a model of the human immune system after a series of vaccinations, proposed in [7] and studied in [6], is presented. It is shown that all coordinates of every solution have at most two extremal values. The theoretical results are compared with experimental data.
Źródło:
Applicationes Mathematicae; 2000, 27, 1; 103-111
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza symulacyjna wpływu prędkości początkowej na stan przepływów wtórnych występujących w kadzi wirowo-osadowej
Analysis of initial velocity influence on a state of secondary flows occurring in a centrifugal-settling vat
Autorzy:
Jakubowski, M.
Wojtasik, I.
Powiązania:
https://bibliotekanauki.pl/articles/2070517.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
prędkość początkowa
klarowanie brzeczki
kadź wirowo-osadowa
initial velocity
wort clarification
centrifugal-settling vat
Opis:
Operacja kłarowania brzeczki piwnej w kadzi wirowo-osadowej realizowana jest poprzez styczne napełnianie zbiornika. W dostępnej literaturze występują rozbieżności dotyczące optymalnej wartości prędkości napełniania. Praca przedstawia analizę wyników modelowania ruchu ptynu w zbiorniku kadzi wirowo-osadowej dla wybranych wartości prędkości początkowych. Analiza dotyczyła wpływu maksymalnej wartości prędkości początkowej na występowanie i kinetykę przepływów wtórnych.
Ctearing beer wort operation in a centrifugal-settling vat is realized by tangential tankege. Discrepancies between the optima] filling veloci-ties occurred in available literaturę. A scope of this work comprises the analysis of fluid flow modeling in a centrifugal-settling vat for the se-iected initial velocity values. The analysis regards an influence of ma-xima] initiat veiocity on secondary flows' kinetic.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 4; 56-57
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie diagnozy potrzeb i potencjału wspólnoty samorządowej w zakresie planowania usług społecznych
Analysis of the initial period of diagnosing the needs and potential of the local government community in the field of planning social services
Autorzy:
Sordyl-Lipnicka, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/28411667.pdf
Data publikacji:
2023-04-28
Wydawca:
Akademia Pedagogiki Specjalnej im. Marii Grzegorzewskiej. Wydawnictwo APS
Tematy:
usługi społeczne
diagnoza
centra usług społecznych
praca socjalna
social services
diagnosis
social services centres
social work
Opis:
Centrum Usług Społecznych (CUS) jako jednostka tworzona fakultatywnie przez władze samorządowe staje się jedną z nowych form organizacyjnych usług społecznych wykraczających poza zakres pomocy społecznej. Do głównych zadań centrum usług społecznych należy koordynacja usług społecznych świadczonych przez określone podmioty na danym obszarze. W tym celu szczególnie istotne jest programowanie usług społecznych czy planowanie organizowania społeczności lokalnej. Jednak by było to możliwe, gminy powinny wywiązać się z obowiązku stworzenia diagnozy potrzeb i potencjału wspólnoty samorządowej w zakresie usług społecznych jako jednego z głównych filarów działalności CUS. Odpowiednio przygotowana diagnoza jest podstawą dla planowania i podejmowania działań oraz szacowania ich kosztów. Celem artykułu jest analiza działań podejmowanych przez centra usług społecznych w Polsce w ramach przygotowania i opracowania diagnozy.
The Social Services Centre (SSC) as a unit created optionally by local government authorities is becoming one of the new organizational forms of social services that go beyond the scope of social assistance. The main tasks of the social services centre include the coordination of social services provided by specific entities in a given area. For this purpose, it is particularly important to program social services or plan the organization of the local community. However, to make it possible, communes should fulfil their obligation to diagnose the needs and potential of the local government community in the field of social services, as one of the main pillars of the SSC activity. A properly made diagnosis is the basis for planning, taking actions and estimating their costs. The aim of the article is to analyse the activities undertaken by social services centres in Poland as part of the preparation and development of a diagnosis.
Źródło:
Praca Socjalna; 2023, 38(1); 121-135
0860-3480
Pojawia się w:
Praca Socjalna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of cable dome under various initial conditions
Autorzy:
Cauner, P.
Kmeť, S.
Powiązania:
https://bibliotekanauki.pl/articles/104237.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
cable dome
active member
stiffness
tensegrity
Opis:
The paper focuses on the numerical analysis of Levy cable dome under two various initial conditions. Experimental device of cable dome is equipped with 7×7 wire ropes with diameter ɸ 6 mm. Nevertheless, it is completely changed for 1×19 wire ropes single strand with diameter ɸ 4 mm. The interchange could lead to creation of more adaptive structure for further static and dynamic analyses. Furthermore, it is essential to stress out that force gauges will improve accordingly.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 1; 5-12
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustical Analysis of Enclosure as Initial Approach to Vehicle Induced Noise Analysis Comparatevely Using STFT and Wavelets
Autorzy:
Błażejewski, A.
Kozioł, P.
Łuczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/176551.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modal analysis
short-time Fourier transform
wavelet transform
acoustic signal processing
Opis:
It is assumed in the paper that the signals in the enclosure in a transient period are similar to a noise induced by vehicles, tracks, cars, etc. passing by. The components of such signals usually points out specific dynamic processes running during the observation or measurements. In order to choose the best method of analysis of these phenomena, an acoustic field in a closed space with a sound source inside is created. Acoustic modes of this space influence the sound field. Analytically, the modal analyses describe the above mentioned phenomena. The experimental measurements were conducted in the room that might comprise the closed space with known boundary conditions and the sound source Br¨uel & Kjær Omni-directional type 4292 inside. To record sound signals before the field’s steady state was reached, the microphone type 4349 and the 4-channel frontend 3590 had been used. The obtained signals have been analysed by using two approaches, i.e. Fourier and the wavelet analysis, with the emphasis on their efficiency and the capability to recognise important details of the signal. The results obtained for the enclosure might lead to the formulation of a methodology for an extended investigation of a rail track or vehicles dynamics.
Źródło:
Archives of Acoustics; 2014, 39, 3; 385-394
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial Results of Nonhierarchical Cluster Methods Use for Low Flow Grouping
Autorzy:
Cupak, A.
Powiązania:
https://bibliotekanauki.pl/articles/123583.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
low flow
K-means method
nonhierarchical cluster analysis
Opis:
In the paper the possibility of using statistical method for data agglomeration, i.e. nonhierarchical cluster analysis for low flow grouping was made. The study material included daily flows from the multi-year period of 1963–1983 collected for 19 catchments, located in the upper Vistula basin. Regions with the same flow were determined with the use of nonhierarchical cluster analysis (K-means). Groups were characterized by low flow and selected physiographic and meteorological features of the catchments. The procedure of catchments assigning to the clusters was started from two clusters and finished at five. The next moving and assigning of catchments into clusters resulted in a cluster in which there was only one catchment (for five clusters). Another objects’ delineation did not give an objective effects, based on which it was difficult to determine a clear criterion of assigning each catchments into the clusters. The last step involved development of the models reflecting correlation and regression relationships. The identified clusters comprised catchments similar in terms of unit runoff, watercourse length, mean precipitation, median altitude, mean catchment slope, watercourse staff gauge zero, area covered by coniferous forests, arable lands, and soils.
Źródło:
Journal of Ecological Engineering; 2017, 18, 2; 44-50
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The picture of financial condition of Polish listed companies in 1995-2010 on the base of their cash flows initial evaluation
Autorzy:
Śnieżek, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/658150.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
cash flows initial evaluation
entities performance
nature of net cash flows
analysis of cash flows
solvency
sectional streams of net cash flows
cash flow statement
financial statements analysis
Opis:
This article addresses the issue of the specificity and significance of the distribution of net cash flows from operating, investing and financing activities in determining of entities financial condition, especially in times of economic crisis. The author’s subject of interest is the variety of entity performance initial evaluation on the base of sectional streams of net cash flows. In the article the author presents results of the research based on polish listed companies cash flows, in the years 1995–2010 and provides initial conclusions from the study.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 257
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical training of future teachers – a comparative analysis of Singapore and Slovakia
Autorzy:
Punčová, Alexandra
Jablonský, Tomáš
Powiązania:
https://bibliotekanauki.pl/articles/1932502.pdf
Data publikacji:
2020-12-30
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Chełmie
Tematy:
Initial teacher education
Practicum
Singapore
Slovakia
Opis:
Pedagogical practice is the most important and useful part of university studies; it is an integral part of teacher training. Due to the fact that Slovak pupils achieve average to below average results in international studies, and the education of the younger generation is the task of the teacher, the paper deals with practical training of future teachers in Singapore – one of the best education systems in the world. It describes the practical training of students in Singapore, compares it with the practical training of Slovak students, and offers incentives for innovation in the current education system.
Źródło:
Scientific Bulletin of Chełm - Section of Pedagogy; 2020, 1; 59-70
2084-6770
Pojawia się w:
Scientific Bulletin of Chełm - Section of Pedagogy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic analysis of the control stage of a high speed steam turbine
Autorzy:
Sławiński, D.
Zakrzewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/175498.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
control stage
residual stresses
initial displacement blade
vibrations blade
Opis:
This paper analyzes the possibility of resonances within a control stage of a high speed turbine. An original method for steady state operation is used for the analysis of the stiffness matrix representing: initial displacement blade (nominal shape blade obtained by nominal working point of turbine) and residual stresses following local crossing yield plastic strain. In the analysis there has been found a possibility of occurance of the resonance frequency, and mistuning by showing the safe working ranges. The calculation used the 3D modal and harmonic analysis within computational solid dynamics (CSD) and the results were compared with the 0D data from literature. After local crossing of yields stresses, on the basis of the harmonic analysis, there has been shown operation of the blade in the resonance point. Before crossing the yield stresses the blade is working in mistuning and a safe point.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 41-49
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk level analysis in the selected (initial) stage of the project life cycle
Autorzy:
Borecki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1841395.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
project management
risk management
life cycle
power engineering
electrical grid
Opis:
This paper focuses on the analysis of selected risks as part of investments in the power engineering at the initial (tender) stage of the life cycle in the context of the method of project management by the Contractor. The study was carried out on the basis of an analysis of over 500 tenders in the power engineering, from the last 5 years, taking into account future forecast data. The analysis carried out in this article was aimed at achieving specific and unique goals and results aimed at creating a useful product, which is the Contractor’s offer in the power engineering, taking into account the most significant risks. The result of this article is to support the project team in implementing risk management in the project at the tender stage. For this purpose, the risks with their basic parameters were defined, which allowed for the development of a risk matrix taking into account the data obtained in the tender procedures of leading electric power distributors. Based on the proposed risk quantification criteria, a list of remedial actions was prepared for all risk types listed in this article. In addition, the aspects of possible elimination/reduction of the impact of the most significant risks that occur at the analyzed stage of the investment life cycle were developed.
Źródło:
Management and Production Engineering Review; 2020, 11, 4; 104-112
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research Analysis of Selection Criteria at the Initial Stage of Swimming Training of Primary School Junior Students
Autorzy:
Eider, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1054746.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
junior primary school
selection in competitive swimming
Opis:
This article serves as a review of literature dedicated to the issue of selection criteria at the initial stage of swimming training of children in junior grades of primary school. Research methods used by the reviewed authors were varied. Only in some cases the overall anthropometric examination was used. This paper presents research results of multiple authors concerned with the swimming initiation age, basic somatic features (height and body mass), physical (motor) fitness, and physical function as major criteria for selection. The literature presented in this article lacks, however, information about potential correlations between the sports skills and measurements of motor skills and somatic features of children who are at an initial stage of competitive swimming. Therefore, this issue has not been discussed in the article.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2015, 11, 3; 55-62
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Problems Faced by the Fresh IPE Graduates at Their Initial Career
Autorzy:
Rahman, Md. Asfakur
Islam, Md. Tasminul
Powiązania:
https://bibliotekanauki.pl/articles/1162853.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Career
Graduates
IPE
Kaizen
Suggestions etc
Opis:
Department of Industrial & Production Engineering started its glorious journey from 2006 in Rajshahi University of Engineering & Technology. Since then approximately 250 students graduated and continuously enhancing the global quality of the department through leading discovery and innovation. Despite their shines in career, some problems come their way and make them realize that they should be more careful about them in their University life. In order to get the regarding information, we surveyed about 100 graduates of IPE from different series. They are now working in different sectors with a different designation. Their experience about their career life will help us to find out the problems faced by the fresh IPE graduates as well as it will help us to solve the problems in our University life. We analyzed the data & build methodology through the brainstorming process & finally achieved our result. This will provide a way to overcome the problems faced by the fresh IPE graduates in their initial career.
Źródło:
World Scientific News; 2018, 110; 56-71
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of “Hot” Drawing Process of Trip Steel Wires at Different Initial Temperatures
Autorzy:
Wiewiórowska, S.
Muskalski, Z.
Siemiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/354578.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TRIP steel
“hot” drawing process
wires
Opis:
In the work the results of preliminary research of the „hot” drawing process of TRIP steel wires at different initial temperatures has been shown. The study is expected to find whether the „hot” drawing process, and so the increase in the temperature of the material being drawn, will block the transformation of retained austenite into martensite and, as a consequence, influence the properties of drawn wire.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1991-1994
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imperfections in calculations of guyed lattice masts
Autorzy:
Matuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/230906.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maszt z odciągami
analiza statyczna
imperfekcja geometryczna
imperfekcja początkowa
guyed mast
static analysis
geometric imperfection
initial imperfection
Opis:
Influence of geometric imperfections of mast shaft in form of initial mast span curvatures both on internal forces status in the structure elements as well as on those elements effort, which is particularly important at the design stage, was analysed based on an example of certain specific mast. The calculations were performed taking into account L/1000 imperfections equal to the permissible assembly deviations as per [1], and L/500 equal to initial imperfections as for uniform built-up columns according to [2]. Remarks and final conclusions have practical meaning and can be useful in design practice.
Źródło:
Archives of Civil Engineering; 2014, 60, 4; 409-420
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of buckling response of the deck panel in axial compression
Autorzy:
Ozguc, O.
Powiązania:
https://bibliotekanauki.pl/articles/258946.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
buckling failure
non-linear finite element analysis
deck panel
initial imperfection
collapse mechanism
Opis:
In this work, buckling strength assessment of a deck of a double hull oil tanker is carried out using the non-linear finite element code ADVANCE ABAQUS. The comparisons are performed with the Det Norske Veritas (DNV-GL) PULS (Panel Ultimate Limit State) buckling code for the stiffened panels, DNV-GL Classification Notes (CN) No.30.1 and the DNV-GL Ship Rules. The case studied corresponds to axial compression. Two levels of imperfection tolerances are analyzed, in accordance with the specifications in the DNV-GL Instruction to Surveyors (IS) and the DNV-GL Classification Notes No. 30.1. Both “as built” and DNV–GL Rule “net” dimensions are analyzed. The strength values from ADVANCE ABAQUS and PULS are very close. DNV-GL CN 30.1 is in conservative side, but the strength differences between the “as built” and “net” dimension cases are consistent with the finite element analysis results. This paper gives a brief description of the background for the stiffened panel models used in PULS, and comparison against non-linear FE analysis, and DNV-GL Classification Society Rules. The finite element code ADVANCE ABAQUS is employed in a non-linear buckling analysis of a stiffened deck panel on a double skin tanker that is subjected to a Condition Assessment Program (CAP) hull survey. The aim of the analyses has been to validate and compare the buckling capacity estimates obtained from PULS, DNV-GL Classification Notes No.30.1 (CN 30.1) and the DNV-GL Ship Rules.
Źródło:
Polish Maritime Research; 2018, 4; 98-105
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control of delay-differential inclusions with multivalued initial conditions in infinite dimensions
Autorzy:
Mordukhovich, B. S.
Wang, D.
Wang, L.
Powiązania:
https://bibliotekanauki.pl/articles/969562.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
discrete approximations
optimal control
variational analysis
endpoint constraints
delay-differential inclusions
multivalued initial conditions
extended Euler-Lagrange formalism
generalized differentiation
Banach and Asplund spaces
necessary optimality conditions
Opis:
This paper is devoted to the study of a general class of optimal control problems described by delay-differential inclusions with infinite-dimensional state spaces, endpoints constraints, and multivalued initial conditions. To the best of our knowledge, problems of this type have not been considered in the literature, except for some particular cases when either the state space is finite-dimensional or there is no delay in the dynamics. We develop the method of discrete approximations to derive necessary optimality conditions in the extended Euler-Lagrange form by using advanced tools of variational analysis and generalized differentiation in infinite dimensions. This method consists of the three major parts: (a) constructing a well-posed sequence of discrete-time problems that approximate in an appropriate sense the original continuous-time problem of dynamic optimization; (b) deriving necessary optimality conditions for the approximating discrete-time problems by reducing them to infinite-dimensional problems of mathematical programming and employing then generalized differential calculus; (c) passing finally to the limit in the obtained results for discrete approximations to establish necessary conditions for the given optimal solutions to the original problem. This method is fully realized in the delay-differential systems under consideration.
Źródło:
Control and Cybernetics; 2008, 37, 2; 393-428
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An algebraic analysis approach to 2-D discrete problems
Autorzy:
Przeworska-Rolewicz, D.
Wysocki, H.
Powiązania:
https://bibliotekanauki.pl/articles/206798.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
analiza algebraiczna
operator początkowy
operator różnicowy
2D systems
algebraic analysis
backward shift
difference operator
forward shift
initial operator
right inverse
right invertible operator
Opis:
A model of algebraic analysis for the 2-index sequences (of the type 2-D) is considered. For difference operators of the form D{x_m,n}:= {x_m+1,n+1 - A_m,nX_m,n} the right inverses and the corresponding initial operators are constructed. Having already known the initial operators, one can determine solutions of the corresponding initial value problems.
Źródło:
Control and Cybernetics; 2001, 30, 2; 149-158
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The d-bar formalism for the modified Veselov-Novikov equation on the half-plane
Autorzy:
Hwang, Guenbo
Moon, Byungsoo
Powiązania:
https://bibliotekanauki.pl/articles/2048897.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
initial-boundary value
integrable nonlinear PDE
spectral analysis
d-bar
Opis:
We study the modified Veselov–Novikov equation (mVN) posed on the half-plane via the Fokas method, considered as an extension of the inverse scattering transform for boundary value problems. The mVN equation is one of the most natural (2+1)-dimensional generalization of the (1+1)-dimensional modified Korteweg-de Vries equation in the sense as to how the Novikov–Veselov equation is related to the Korteweg–de Vries equation. In this paper, by means of the Fokas method, we present the so-called global relation for the mVN equation, which is an algebraic equation coupled with the spectral functions, and the d-bar formalism, also known as Pompieu’s formula. In addition, we characterize the d-bar derivatives and the relevant jumps across certain domains of the complex plane in terms of the spectral functions.
Źródło:
Opuscula Mathematica; 2022, 42, 2; 179-217
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What Determines the Success of an IPO? Analysis of IPO Underpricing on the Warsaw Stock Exchange
Autorzy:
Małachowski, Paweł
Gadowska dos Santos, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/1356521.pdf
Data publikacji:
2021-01-21
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Ekonomicznych
Tematy:
IPO underpricing
stock exchange debut
initial rate of return
Opis:
This article aimed to analyse the factors that influence the level of underpricing of an initial public offering (IPO) on the Warsaw Stock Exchange (WSE), based on the example of 101 companies debuting on the main market between 2010 and 2019. We discuss the theories that explain IPO underpricing and the research conducted so far on the Polish market. In the main part of the article, we present the results of our study aimed at identifying and characterising the hitherto-unrecognised factors determining IPO underpricing, which is a contribution to the current research on WSE trends. Our findings point to three variables that influence the level of underpricing: the involvement of private equity or venture capital funds in the transaction, the rate of return of the WSE Index in the 6 months before the IPO, and the amount of capital offered during the debut.
Źródło:
Central European Economic Journal; 2021, 8, 55; 1 - 14
2543-6821
Pojawia się w:
Central European Economic Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of the Tvergaard parameters at low initial stress triaxiality for S235JR steel
Autorzy:
Kossakowski, P. G.
Powiązania:
https://bibliotekanauki.pl/articles/260394.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Tvergaard parameters
Gurson-Tvergaard-Needleman material model
GTN
S235JR steel
Opis:
This paper discusses the influence of the Tvergaard parameters, qi, which are basic constants of the Gurson-Tvergaard- Needleman (GTN) material model, on the numerically simulated load-carrying capacity of tensile elements made of S235JR steel. The elements were considered to be under static tension at low initial stress triaxiality σm/σe = 1/3. Two sets of the Tvergaard parameters qi were analyzed: those typical of structural steels and those dependent on material strength properties. The results showed that the Tvergaard parameters, qi, had influence on the load-carrying capacity of tensile elements at low initial stress triaxiality. They affected the strength curves and the changes in the void volume fractions determined for S235JR steel elements
Źródło:
Polish Maritime Research; 2014, 4; 100-107
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of selected properties of asphalt concrete with synthetic wax
Autorzy:
Mazurek, G.
Iwański, M.
Powiązania:
https://bibliotekanauki.pl/articles/202091.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
initial yield strength
synthetic wax
Prony Series
pseudo-strain
viscoplastic deformation
granica plastyczności
wosk syntetyczny
szereg Prony
Opis:
This article discusses the issue of viscoplastic deformation that usually occurs in road pavements, especially in the summer season in Poland. The evaluation of viscoplastic deformations was performed on the example of the asphalt concrete designated for the binding course layer (AC16W). Additionally, the bitumen used for manufacturing asphalt concrete samples was modified with two types of synthetic waxes widely applied in the warm mix asphalt technology. These waxes varied in molecular weight, which affected their softening point results. Before decomposition of the total strain into elastic and viscoplastic part, oscillatory tests in the linear viscoelastic region were required. The generalized Maxwell model was used to describe the behavior of asphalt concrete in the linear viscoelastic range. Using the elasto-viscoelastic correspondence principle, described by Schapery, the initial yield strength stress was evaluated. The pseudostrain variable turned out to be useful for estimating the onset of viscoplastic strains occurring in road pavement. Such engineering procedure approach could result in faster approximation of the yield strength level during the design of pavement structures. It will also allow for differentiation of mixtures in terms of their susceptibility to permanent deformation and of their sensitivity to traffic induced overloading.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 217-228
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of ventilation regimes of the oblique wedge-shaped surface piercing hydrofoil during initial water entry process
Autorzy:
Ghadimi, P.
Javanmardi, N.
Powiązania:
https://bibliotekanauki.pl/articles/258736.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
emi-submerged propeller
wedge water entry
ventilation pattern
free surface profile
Opis:
The suction side of a surface piercing hydrofoil, as a section of a Surface Piercing Propeller (SPP), is usually exposed to three phases of flow consisting air, water, and vapour. Hence, ventilation and cavitation pattern of such section during the initial phase of water entry plays an essential role for the propeller’s operational curves. Accordingly, in the current paper a numerical simulation of a simple surface piercing hydrofoil in the form of an oblique wedge is conducted in three-phase environment by using the coupled URANS and VOF equations. The obtained results are validated against water entry experiments and super-cavitation tunnel test data. The resulting pressure curves and free surface profiles of the wedge water entry are presented for different velocity ratios ranging from 0.12 to 0.64. Nondimensional forces and efficiency relations are defined in order to present the wedge water entry characteristics. Congruent patterns are observed between the performance curves of the propeller and the wedge in different fully ventilated or partially cavitated operation modes. The transition trend from fully ventilated to partially cavitated operation of the surface piercing section of a SPP is studied and analyzed through wedge’s performance during the transitional period.
Źródło:
Polish Maritime Research; 2018, 1; 24-34
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępne imperfekcje łukowe w analizie połaciowych stężeń poprzecznych
Analysis of the horizontal roof bracings in terms of the initial bow imperfection
Autorzy:
Niewiadomski, L.
Zamorowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2068024.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska
Tematy:
stężenia
imperfekcje
hala stalowa
concentrations
imperfections
steel hall
Opis:
W artykule zaprezentowano autorski sposób wyznaczania obciążenia stabilizującego dla stężeń, zastępującego wstępne wygięcia górnych pasów w modelu przestrzennym. Praktyczne zastosowanie tego sposobu przedstawiono na przykładzie obliczeń jednonawowej hali stalowej. Uzyskane wyniki porównano z wynikami otrzymanymi dla przestrzennych konstrukcji z imperfekcjami geometrycznymi, analizowanymi za pomocą geometrycznie nieliniowego modelu obliczeniowego oraz z wynikami dla płaskiego, normowego modelu obliczeniowego stężeń.
The author’s approach has been presented in this paper for the determination of the stabilizing load for bracing systems. Such an approach allows replacing the pre-bending of the upper flanges in the 3D model. An example of a practical application of this approach has been presented in this paper for a single-nave hall. The obtained results were compared to the geometrical non-linear calculations of 3D construction model with the geometrical imperfections and to the 2D calculation of the bracing systems model based on codes.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2017, 23 (173); 231-244
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Judicial Independence in Kosovo. A Critical Analysis of Select Provisions of the Law on Courts
Autorzy:
Xhemajli, Haxhi
Halili, Xhevdet
Kilgallon, Tristin M.
Powiązania:
https://bibliotekanauki.pl/articles/1038107.pdf
Data publikacji:
2020
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
law on courts
judicial independence
initial training
corruption
judicial compensation
protection
Opis:
As the Republic of Kosovo continues to develop as independent state, the world watches closely. Of particular interest to many is whether Kosovo will truly embrace the rule of law or whether it’s growth will continue to be hampered by the long shadow of corruption. As the judiciary plays a central role in ensuring the rule of law is implemented and followed, it is critical that judges are free to exercise their judicial power freely and without fear of recourse from other members of the government, or the public. To this end, the newly revised Law on Courts is a key piece of legislation, as it specifies the qualifications, rights, and duties of the judges. This paper will analyze key provisions of the Law on Courts, paying special attention to how they impact judicial independence.
Źródło:
Academicus International Scientific Journal; 2020, 22; 127-140
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Searching for optimal prestressing of steel bar structures based on sensitivity analysis
Autorzy:
Yurchenko, V. V.
Peleshko, I. D.
Powiązania:
https://bibliotekanauki.pl/articles/230774.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optymalizacja parametryczna
element zbędny
siła sprężająca początkowa
sprężenie optymalne
analiza wrażliwości
metoda rzutowania gradientowego
parametric optimization
redundant member
initial prestressing force
optimal prestressing
sensitivity analysis
gradient projection method
Opis:
The paper considers parametric optimization problems for the steel bar structures formulated as nonlinear programming ones with variable unknown cross-sectional sizes of the structural members, as well as initial prestressing forces introduced into the specified redundant members of the structure. The system of constraints covers load-bearing capacity constraints for all the design sections of the structural members subjected to all the design load combinations at ultimate limit state, as well as displacement constraints for the specified nodes of the bar system, subjected to all design load combinations at serviceability limit state. The method of the objective function gradient projection onto the active constraints surface with simultaneous correction of the constraints violations has been used to solve the parametric optimization problem. A numerical technique to determine the optimal number of the redundant members to introduce the initial prestressing forces has been offered for high-order statically indeterminate bar structures. It reduces the dimension for the design variable vector of unknown initial prestressing forces for considered optimization problems.
Źródło:
Archives of Civil Engineering; 2020, 66, 3; 525-540
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of air jets velocity attenuation at special initial conditions
Autorzy:
Voznyak, Orest
Spodyniuk, Nadiia
Savchenko, Olena
Dovbush, Oleksandr
Kasynets, Mariana
Datsko, Oleksandra
Powiązania:
https://bibliotekanauki.pl/articles/2146736.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
air distribution
swirl jet
rectangular jet
compact jet
flat jet
dystrybucja powietrza
strumień powietrza
Opis:
The article is devoted to solving the significant problem of efficiency increasing of air distribution in the premise by swirl air jet. The aim of the article is to decrease coefficient of velocity attenuation due to intensification of initial turbulence of different air streams leakage from the air distributor and to obtain of analytical equations for calculation of air distribution in a room to ensure the normative indoor air parameters. Effect of flow twisting results in a reduction of the velocity attenuation coefficient by 2.4 times. The regression analysis testified that the attenuation coefficient of the swirl air jet is more affected by the angle of the twisting plates inclination and less affected by the angle of change of the air flow direction. The attenuation coefficient of all types of rectangular air jets is more influenced by the the ratio of the sides of slit b/l and the angle of change of the air flow direction is also less affected. To minimize the attenuation factor, it is effective to use air distributors at smaller swivel plates inclination angles for swirl air jets and a smaller slit size ratio for all types of rectangular air jets.
Źródło:
Diagnostyka; 2022, 23, 3; art. no 2022308
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 76

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