Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "cross-section" wg kryterium: Temat


Tytuł:
Wyznaczenie naprężeń normalnych w przekrojach komina żelbetowego czteroprzewodowego
The determination of normal stresses in cross-section of the four-flue reinforced concrete chimney
Autorzy:
Borzęcki, K.
Słowik, M.
Powiązania:
https://bibliotekanauki.pl/articles/390306.pdf
Data publikacji:
2008
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
normal stresses
reinforced concrete chimney
full cross-section
cross section weakened by openings
Opis:
W niniejszej pracy zaprezentowano analityczny sposób wyznaczenia naprężeń w kominie czteroprzewodowym o przekroju złożonym z wycinków pierścieni. Przeanalizowano cztery modele obliczeniowe komina: układ przewodów pełny i z otworami ustawiony na kształt rombu w stosunku do przepływu wiatru oraz układ przewodów pełny i z otworami ustawiony na kształt kwadratu w stosunku do przepływu wiatru. Przy wykonywaniu obliczeń wykorzystano prace M. Lachmana [1] i [2], w których podane są dane wyjściowe do obliczeń kominów wieloprzewodowych.
In the paper the way of calculation of compressive stresses in the cross-section of a four-flue reinforced concrete chimney has been presented. Two types of cross section have been considered: the full cross section and the cross section weakened by openings. The analysis described in the paper refers to the chimney arrangement in diamond shape in relation to wind flow.
Źródło:
Budownictwo i Architektura; 2008, 3, 2; 97-118
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anatomy of contaminated aquifers of an industrial site : insights from the stable isotope compositions of waters and dissolved inorganic carbon
Autorzy:
Vennemann, T. W.
Angloher-Reichelt, S.
Powiązania:
https://bibliotekanauki.pl/articles/2058959.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
isotope compositions
inorganic carbon
geological cross-section
Opis:
The hydrogen and oxygen isotopes of water and the carbon isotope composition of dissolved inorganic carbon (DIC) from different aquifers at an industrial site, highly contaminated by organic pollutants representing residues of the former gas production, have been used as natural tracers to characterize the hydrologic system. On the basis of their stable isotope compositions as well as the seasonal variations, different groups of waters (precipitation, surface waters, groundwaters and mineral waters) as well as seasonably variable processes of mixing between these waters can clearly be distinguished. In addition, reservoir effects and infiltration rates can be estimated. In the northern part of the site an influence of uprising mineral waters within the Quaternary aquifers, presumably along a fault zone, can be recognized. Marginal infiltration from the Neckar River in the east and surface water infiltration adjacent to a steep hill on the western edge of the site with an infiltration rate of about one month can also be resolved through the seasonal variation. Quaternary aquifers closer to the centre of the site show no seasonal variations, except for one bore hole close to a for mermill channel and an other bore hole adjacent to a rain water channel. Distinct carbon isotope compositions and concentrations of DIC for these different groups of waters reflect variable influence of different components of the natural carbon cycle: dissolution of marine carbonates in the mineral waters, biogenic, soil-derived CO2 in ground- and surface waters, as well as additional influence of atmospheric CO2 for the surface waters. Many Quaternary aquifer waters have, how ever, distinctly lower δ13CDIC values and higher DIC concentrations compared to those expected for natural waters. Given the location of contaminated groundwaters at this site but also in the industrially well-developed valley out side of this site, the most likely source for the low δ13CDIC values is a biodegradation of anthropogenic organic substances, in particular the taroils at the site.
Źródło:
Geological Quarterly; 2005, 49, 2; 113-126
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wage Flexibility across EMU Members: How Endogenous is the Currency Union?
Autorzy:
Buscher, Herbert
Gabrisch, Hubert
Powiązania:
https://bibliotekanauki.pl/articles/659699.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
convergence
wage dynamics
European Union
cross section estimates
Opis:
Abstract. The authors test whether the introduction of a common currency and the single monetary policy in the European Monetary Union might have increased the need for nominal wage flexibility. They try to find out whether wage dynamics between euro member countries became more synchronized through the adoption of the common currency. They run a model of endogenously induced changes of bilateral correlation coefficients of wage dynamics, where trade intensity, sector specialization and financial integration are assumed to be the driving forces for endogeneity on the labor markets. They use a panel data structure to allow for cross-section weights for country-pair observations. Regressions are with instrument variables in order to disentangle exogenous from endogenous influences. They apply these techniques to the dynamics of nominal wages, real wages and unit labor costs. They find evidence of persistent asymmetries in nominal wage formation, despite a single currency and monetary policy, which is responsible for diverging unit labor costs and emerging trade imbalances among the EMU member countries.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2010, 241
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of structural damage in vibroacoustic analysis
Autorzy:
Rychlik, A.
Powiązania:
https://bibliotekanauki.pl/articles/247382.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
damage to the cross-section of a sample
diagnostic signal for identifying damage to the cross-section of a sample
inertia
Opis:
Supports are one of the most popular structural elements in engineering. They have a wide range of applications, including in pressure gauge connectors, fixtures for photovoltaic and solar panels, and traffic signs. Supports are also used in highly complex engineering projects such as airplane wings or rotor blades. Monitoring methods for detecting and predicting the condition of support structures have become an important area of research. Structural damage to machines and machine parts can be prevented through early detection of fatigue cracks with the use of non-destructive methods. The paper proposes a method for detecting fatigue cracks along the cross-sectional area of a specimen based on selected parameters of the vibration signal. The diagnostic signal for analyses of specimen cross-sectional area was vibration acceleration, which was described with the use of the following parameters: changes in amplitude and waveform (FFT), RMS amplitude, changes in the amplitude of a vibrating sample, and changes in the phase angle of a vibrating sample. In the test stand, cross-sectional damage was caused by forces of inertia acting on the specimen. The results of the study indicate that all of the analysed parameters can be used to detect the loss of structural continuity (mechanical and fatigue cracks) in an object. An analysis of changes in the amplitude of a vibrating sample was the fastest and most comprehensive source of information.
Źródło:
Journal of KONES; 2016, 23, 1; 279-287
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kopuły i ich geometria
The geometry of domes
Autorzy:
Kornak, A.
Powiązania:
https://bibliotekanauki.pl/articles/134839.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
dome
geometry
cross section
base
criterion of geometric complexity
Opis:
This article is focused on design of traditional historical domes. Outstanding works of architecture such as: the dome of Hagia Sophia, dome of the dome of the rock mosque, the dome of Florence Cathedral, the dome of Basil's Cathedral in Moscow, as well as less famous – Greek-Catholic Church of St. Michael the Archangel in Krowica Sama have been analyzed. According to the criterion of geometrical complexity we created the table in which the individual structures were systematized. The table also includes information on historical period, building materials, technology and dimensions for all examples. The paper aims to summarize the changes that took place in terms of how to construct and demonstrate the appropriateness of use of this type of solution, which led to the conclusion that each of new solutions is based on already existing one.
Źródło:
Technical Issues; 2016, 3; 60-66
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron elastic collisions with C3F6 molecule
Autorzy:
Możejko, P.
Szmytkowski, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/1954668.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
electron scattering
elastic cross section
hexafluoropropene
independent atom method
Opis:
We report calculations of differential and integral cross sections for intermediate- and high-energy (50-1000eV) elastic collisions of electrons with hexafluoropropene (C3F6) molecules. The calculations have been carried out using the independent atom model with static-polarization model potential. The present results are compared with elastic cross sections estimated from total and ionization experiments. Agreement between present calculations and the "experiment" is good for energies above 70eV.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 171-178
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Sampling Spacing on the Accuracy of Volume of a Medium-Size Gully
Autorzy:
Jun, Luo
Bin, Zhang
Du, Zhengpin
Zheng, Jilin
Liu, Hui
Qin, Fachao
Deng, Qinchun
Powiązania:
https://bibliotekanauki.pl/articles/123269.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
three modes
sampling spacing
gully volume
gully cross-section
Opis:
Accurate morphological parameters are key to understand the process and mechanism of gully erosion, but little information exists regarding the accuracy of gully volume influenced by sampling spacing. In order to assess the influence of sampling spacing on volume of medium gully under the condition of different shapes of gully cross-sections, as well as to provide information for proposed surveys, a MultiStation was utilized to obtain the point cloud of a Uand V-shaped gully. The coordinates were subsequently rarefied to a certain sampling spacing, and the gully volumes of three modes (Mode 1 only including rarefied terrain points; Mode 2 including detailed terrain and rarefied terrain points; Mode 3 including the rarefied detailed terrain points and terrain points with a given sampling spacing) were calculated in ArcGIS. The results showed that the error of gully volume increased non-monotonously with sampling spacing increased, and that the detail points had greater influence on the gully volume of a U-shaped than a V-shaped gully. As to Mode 1 and 2, the relative error (RE) of U-shaped gully volume increased faster with sampling spacing increasing, and presented high positive correlation. However, in the case of a V-shaped gully, a middle positive correlation for Mode 1 can be observed, and the RE was below 3% for Mode 2. For Mode 3, an increase in the sampling spacing of the terrain led to the larger RE, average RE, and variance of absolute error. If extremely high accuracy (2.5% of RE) is required, sampling spacing is less than 0.5 m; if high accuracy (5% of RE) is set, the sampling spacing of terrain points is below 0.8 m for a U-shaped gully, while the corresponding sampling spacing of terrain points and detail points are 2.0 m and 1.85 m, 3.0 m and 1.80 m, and 4.0 m and 0.75 m for a V-shaped gully. The shape of the gully’s cross-section, as well as the exact location of the shoulder line will affect the accuracy of the gully’s volume. This study will increase the efficiency of detail survey in the field for medium gully.
Źródło:
Journal of Ecological Engineering; 2019, 20, 11; 109-121
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Components for differential cross-section with taking into account the polarization effects in elastic electron-deuteron scattering
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1066249.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cross-section
deuteron
deuteron wave function
electron-deuteron scattering
Opis:
The components for differential cross-section was considered with taking into account the polarization effects in elastic electron-deuteron scattering. These characteristics are analyzed for angle of electron scattering θ = 70º and different momentums. The angular-momentum dependence of values components for differential cross-section have been evaluated in 3D format. The wave function of the deuteron in the coordinate representation for the Reid93 potential was applied to numerical calculations.
Źródło:
World Scientific News; 2019, 131; 279-286
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cross- section and material optimization of an automotive chassis using FEA
Autorzy:
Mangole, Hidaitulla
Powiązania:
https://bibliotekanauki.pl/articles/1182428.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Automotive ladder chassis
FEA
Material and cross- section optimization
Opis:
The objective of this project is to seek out best material and most fitted cross-section for an Eicher E2 Truck ladder chassis with the constraints of most shear stress, equivalent stress and deflection of the chassis under maximum load condition. In present the Ladder chassis that are uses for creating buses and trucks are C and that I cross section sort, that area unit product of Steel alloy (Austenitic). In Asian country variety of passengers travel within the bus isn't uniform, excess passengers area unit movement within the buses daily as a result of that there are unit forever prospects of being failure/fracture within the chassis/frame. So Chassis with high strength cross section is required to attenuate the failures together with issue of safety in design. Within the present work, we have taken higher strength because the main issue, that the dimensions of an existing vehicle chassis of an Eicher E2 (Model no.11.10) Truck is taken for analysis with materials specifically ASTM A710 Steel, ASTM A302 steel and metal Alloy 6063-T6 subjected to constant load. Vehicle chassis are modelled by considering two different cross-sections specifically C and Rectangular Box (Hollow) sort cross sections.
Źródło:
World Scientific News; 2017, 69; 98-110
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the cross-section shape in the capillaries on the wetting properties demonstrated by the calculated wetting angles
Autorzy:
Hartge, K.H.
Bachmann, J.
Woche, S.K.
Powiązania:
https://bibliotekanauki.pl/articles/26605.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
capillary cross section
wetting property
capillary rise
wetting angle
Źródło:
International Agrophysics; 2004, 18, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the application of elliptic cross-section matrices for axial high gradient magnetic separation: key considerations for optimization
Autorzy:
Zheng, Xiayu
Wang, Yuhua
Lu, Dongfang
Li, Xudong
Powiązania:
https://bibliotekanauki.pl/articles/110325.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
elliptic matrices
expanded capture models
capture cross section
overlapping
Opis:
To reveal the key optimization considerations for the application of elliptic cross-section matrices in axial high gradient magnetic separation (HGMS), the performance of circular and elliptic matrices was investigated experimentally and theoretically, providing that the short axis of elliptic matrix was equal to the diameter of circular matrix. Three schemes were adopted to investigate the performance matrices with ratio of long axis to short axis λ of 1 (circular matrix), 1.6 and 2. Under the same matrix unit number, hematite recovery of elliptic matrices could be 5~20% higher than that of circular matrices. For the case that the separation space was fully filled under the same matrix unit spacing, elliptic matrices showed higher and lower hematite recovery in low and relatively high magnetic field. The particle capture cross section area of elliptic matrix could be 1.4~1.8 times larger than that of circular matrix. Analyses with particle capture models showed that higher hematite recovery was ascribed to the larger particle capture cross section of the elliptic matrices and overlapping of the capture cross section was responsible for the lower hematite recovery of elliptic matrices in relatively high magnetic field. For substitution of circular matrices with elliptic matrices in axial HGMS, overlapping of capture cross section of target particles should be taken into consideration.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 655-666
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probing measurements of the Meyer hardness index of radial, tangential and cross section of various types of wood
Autorzy:
Koczan, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/24072400.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
beech
birch
oak
pine
merbau
tangential section
radial section
cross section
Meyer hardness index
Opis:
The Meyer index is a power exponent appearing in Meyer hardness power law, which describes the dependence of the indenting force on the diameter of the indentation caused by the ball (or alternatively a cylinder). A perfectly plastic material should have a Meyer hardness index of 2 and a perfectly elastic material of 3. Previous research by the author and co-workers indicated that the Meyer index of beech wood is 2.5 and for metals aluminum 2.25, copper 2.0. This gave rise to the hypothesis that the hardness index of each wood is about 2.5. It was decided to verify this hypothesis for different types of wood, different anatomical cross-sectional directions. Research on such diversity must therefore be of a probing nature. Nevertheless, these probing measurements indicate that different types of wood in given sectional planes have similar Meyer indexes, but in each section it is a different value. The measured mean value in the radial section was 2.41, in the tangential section 2.28 and in the cross section 1.98. Thus, the initial hypothesis of the value 2.5 was confirmed only for the radial section, and for the tangential and cross sections, new values of 2.25 and 2.0 were hypothesized. Only the extreme values of the Meyer indexes (on the radial and cross section) turned out to be statistically significantly different.
Pomiary sondażowe wskaźnika twardości Meyera przekroju promieniowego, stycznego i poprzecznego różnych rodzajów drewna. Wskaźnik Meyera jest to wykładnik potęgi w zależności siły wgniatającej od średnicy wcisku pochodzącego od kulki. Materiał idealnie plastyczny winien mieć wskaźnik twardości Meyera równy 2, a idealnie sprężysty wartość 3. Dotychczasowe badania autora i współpracowników wskazały, że wskaźnik Meyera drewna bukowego wynosi 2.5, aluminium 2.25, zaś miedzi 2.0. Zrodziło to przypuszczenie, że wskaźnik twardości każdego drewna wynosi około 2.5. Postanowiono zweryfikować tą hipotezę dla różnych rodzajów drewna na różnych płaszczyznach anatomicznych przekroju. Badania takiej różnorodności musiały mieć zatem charakter sondażowy. Niemniej te badania sondażowe wskazały, że różne rodzaje drewna w danych płaszczyznach przekroju mają zbliżone wskaźniki Meyera, ale w każdym przekroju jest to inna wartość. Zmierzona wartość średnia w przekroju promieniowym wyniosła 2.41, w stycznym 2.28 i poprzecznym 1.98. Zatem wyjściowa hipoteza wartości 2.5 potwierdziła się tylko dla przekroju promieniowego, zaś dla przekroju stycznego i poprzecznego powstały hipotezy nowych wartości 2.25 i 2.0. Jedynie skrajne wartości wskaźników Meyera (na przekroju promieniowym i poprzecznym) okazały się statystycznie istotnie różne.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2023, 121; 21--27
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wymiarowanie przekrojów poziomych kominów żelbetowych w stanie granicznym nośności wg PN-EN - algorytm obliczeniowy
Calculation of horizontal cross-section of concrete chimney at ultimate limit state according to PN-EN - computational algorithm
Autorzy:
Poński, M.
Powiązania:
https://bibliotekanauki.pl/articles/2068307.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska
Tematy:
kominy żelbetowe
wymiarowanie
algorytm
concrete chimneys
cross-section calculating
algorithm
Opis:
W pracy przedstawiono metodę wymiarowania pierścieniowych żelbetowych przekrojów poziomych w stanie granicznym nośności przez podanie zasad budowania odpowiednich nomogramów dla dowolnego gatunku stali zbrojeniowej. Zaprezentowano algorytm obliczeniowy oraz przykład liczbowy.
In the paper calculation method of horizontal cross-section of concrete chimney at ultimate limit state is presented. The principles of building a suitable nomograms for any grade of steel are shown. Calculation algorithm and a numerical example are given.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2016, 22 (172); 275-285
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propozycja klasyfikacji konstrukcji kopułowych
An attempt to the classification of structures of domes
Autorzy:
Kornak, A.
Powiązania:
https://bibliotekanauki.pl/articles/134811.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
dome
criterion of geometric complexity
cross section
base
Renaissance
baroque
Opis:
This article is focused on considerations of taxonomic methodology of traditional historical design, and is a development of the article entitled "The geometry of domes." A basic parameter referred to in the analysis is the criterion of geometric complexity. On this basis every object was analyzed and classified according to the adopted category. The dimensions and construction material were also given. The practical use of the proposed method is illustrated in examples by the outstanding works of architecture such as: the Church of Santa Maria degli Angeli in Florence, the chapel of San Pietro in Montorio Basilica of St. Peter in Rome, the Church of Santa Maria della Consolazione at Todi, Il Redentore in Venice, Church of s. Ivo in Rome. Those selected objects are European provenience and come from the Renaissance and Baroque. According to the above parameters the table in which the individual structures were systematized was created. It aims to compare the changes taking place in the field of geometry, size and the way of constructing the objects. Analysis, which were made, lead to the obvious conclusion that each following geometric solution are is based on the existing achievements.
Źródło:
Technical Issues; 2016, 1; 44-51
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cross-Sectional Area Discontinuities in Closed Hard-Walled Ducts on Frequency of Longitudinal Modes
Autorzy:
Meissner, M.
Powiązania:
https://bibliotekanauki.pl/articles/177934.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
longitudinal duct modes
discontinuity in duct cross-section
contraction ratio
Opis:
A simple analytical method is developed to estimate frequencies of longitudinal modes in closed hard-walled ducts with discontinuities in a cross-sectional area. The approach adopted is based on a general expression for the acoustic impedance for a plane wave motion in a duct and conditions of impedance continuity at duct discontinuities. Formulae for mode frequencies in a form of transcendental equations were found for one, two and three discontinuities in a duct cross-section. An accuracy of the method was checked by a comparison of analytic predictions with calculation data obtained by use of numerical implementation based on the forced oscillator method with a finite difference algorithm.
Źródło:
Archives of Acoustics; 2010, 35, 3; 421-435
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies