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Wyświetlanie 1-10 z 26
Tytuł:
Positron Annihilation in Cotton Cellulose
Autorzy:
Golonka, P.
Mayer, J.
Dryzek, E.
Powiązania:
https://bibliotekanauki.pl/articles/2024232.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
42.70.Jk
Opis:
The changes of the cotton fibre microstructure as a result of annealing at temperatures from 20ºC to 300ºC were investigated by positron lifetime spectroscopy and differential scanning calorimetry. The aim of the paper was to examine the cotton cellulose thermal degradation process.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 363-367
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement Accuracy Investigation of Touch Trigger Probe with Five-Axis Machine Tools
Badania dokładności pomiarów elektrostykową sondą przełączającą na obrabiarkach pięcioosiowych
Autorzy:
Rahman, M. M.
Mayer, J. R. R.
Powiązania:
https://bibliotekanauki.pl/articles/139534.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
probing
machine tool
touch probe
repeatability
measurement inaccuracy
sondowanie
obrabiarka
sonda stykowa
powtarzalność
niedokładność pomiaru
Opis:
The touch trigger probe plays an important role in modern metrology because of its robust and compact design with crash protection, long life and excellent repeatability. Aside from coordinate measuring machines (CMM), touch trigger probes are used for workpiece location on a machine tool and for the accuracy assessment of the machine tools. As a result, the accuracy of the measurement is a matter of interest to the users. The touch trigger probe itself as well as the measuring surface, the machine tool, measuring environment etc. contribute to measurement inaccuracies. The paper presents the effect of surface irregularities, surface wetness due to cutting fluid and probing direction on probing accuracy on a machine tool.
Elektrostykowe sondy przełączające grają istotną rolę we współczesnej metrologii z uwagi na ich zwartą i silną konstrukcję, odporność na uszkodzenia, długowieczność i doskonałą powtarzalność. Obok zastosowań we współrzędnościowych maszynach pomiarowych (CMM), sondy te są wykorzystywane do wyznaczenia położenia przedmiotu obrabianego na obrabiarce i oceny dokładności obrabiarek. Tak więc, dokładność pomiaru jest sprawą istotną dla użytkowników. Do powstawania niedokładności pomiaru przyczynia się sama sonda, a także powierzchnia pomiarowa, obrabiarka, środowisko pomiarowe itp. W artykule przedstawiono wpływ nierówności powierzchni, wilgotności powierzchni powodowanej obecnością chłodziwa i kierunku sondowania na dokładność pomiaru na obrabiarce.
Źródło:
Archive of Mechanical Engineering; 2016, LXIII, 4; 495-510
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A preconditioned solution scheme for the computation of compressible flow in turbomachinery at arbitrary mach numbers
Autorzy:
Anker, J. E.
Mayer, J. F.
Stetter, H.
Powiązania:
https://bibliotekanauki.pl/articles/1986683.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
preconditioning
non-reflecting boundary condition
Mach number independency
turbomachinery flow
Opis:
A preconditioned solution scheme for the computation of compressible flow in turbomachinery at arbitrary Mach numbers is presented. The preconditioning technique used is applied to a state-of-the-art explicit, time-marching Navier-Stokes code which originally was developed for compressible, high-speed turbomachinery applications. It combines the ideas of low Mach number preconditioning and artificial compressibility method into a unified approach where principally fluids with arbitrary equations of state can be simulated. As shown by the test cases presented, it allows the code to simulate flows efficiently and accurately independent of the Mach number. A description of the Navier-Stokes equations for rotating coordinate systems, along with the solution scheme and the details of the preconditioning method is given. Since turbomachinery computations are often performed on truncated domains, the solution scheme should be used in conjunction with non-reflecting boundary conditions. A change in the time-dependency of the equations due to preconditioning necessitates a modification of the boundary conditions. Thus, a derivation of the appropriate boundary conditions for the presented preconditioned scheme was performed and the resultant equations are given in this paper. The effectiveness of the new boundary conditions is demonstrated by comparing them with both boundary conditions that use the standard one-dimensional characteristic approach and the original boundary conditions for the non-preconditioned case.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 143-176
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Axis location and scale factors estimation for three-axis machines from periodic performance checks with laser distance measurements - risks and opportunities
Autorzy:
Nafi, A.
Łoś, A.
Mayer, J.R.R.
Powiązania:
https://bibliotekanauki.pl/articles/99577.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
CMM
calibration
performance
diagnostic
Opis:
Users of coordinate measuring machine and large gantry machines need to ensure the volumetric performance of their machines in order to inspect, or machine, mechanical parts with precision. In the case of CMMs, the ASME B89.4.10360.2-2008 document imposes seven directions for a volumetric check. These directions offer some redundancy for axis location (out-of-squarenesses) and scale factor estimation. The paper looks at the opportunity of using the data for immediate machine correction and the risks involved. In particular, the fact of using test data for calibration and verification, the potential contamination from non-modelled motion errors and the representativity of the estimated parameters are considered. Experimental results obtained using laser interferometry on a LEGEX CMMs are used to present the main concepts.
Źródło:
Journal of Machine Engineering; 2010, 10, 4; 89-99
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast Stochastic Reorientations in Nematic PAA and PAP
Autorzy:
Podsiadły, R.
Mayer, J.
Janik, J. A.
Krawczyk, J.
Stanek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1963251.pdf
Data publikacji:
1997-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
35.20.Yh
24.50.Fq
61.30.Eb
Opis:
Incoherent quasielastic neutron scattering spectra were measured for nematic para-azoxyanisole (PAA) and para-azoxyphenetole (PAP) with the energy resolution of ca. 30 μ eV, at Dubna IBR-2 reactor. Data processing contained a careful background subtraction and the multiple scattering correction. The corrected spectra were subjected to a reorientational model fitting procedure. For PAA, a model of two convoluted reorientations - that of benzene rings coupled with the terminals and that of the whole molecule around the long molecular axis - gave a fairly good description of the quasielastic neutron scattering spectrum. For PAP, introducing a third motion - interconformational jumps in the ethoxy terminals - in addition to motions suggested for PAA, gave a good agreement with the measured quasielastic neutron scattering spectrum.
Źródło:
Acta Physica Polonica A; 1997, 91, 3; 513-518
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Udarność kompozytowych powłok z tkaniną aramidową na podłożu stalowym
Autorzy:
Mayer, P.
Pach, J.
Powiązania:
https://bibliotekanauki.pl/articles/1190016.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
powłoka kompozytowa
powłoka polimerowa
podłoże stalowe
odporność na uderzenia
powłoka wielowarstwowa
composite coating
polymer coating
steel
impact resistant of coatings
multilayer coating
Opis:
The article presents the results of impact composite coatings on the thermoplastic matrix with varying amounts of aramid fabrics. To prepare composite coatings applied thermoplastic copolymer of SBS (styrenebutadiene- styrene) with a linear chain, trade name Kraton. To reinforcement selected aramid fabric (Twaron 1210 fiber), a plain weave and a weight of 175 g / m2. As the base polymer coatings used steel sheet with a thickness of 1.0 mm marked with DC01 according to EN 10027-1: 2007. It is a quality steel alloy designed for cold-rolled products. Steel substrate were washed in a solution of water and detergent, and then degreased with acetone. First step was compressed at 180 ° C for 3 minutes without load, and then three minutes with a load of 2 MPa. SBS copolymer film having a thickness of 800 μm. The films again were compressed with fabrics on steel substrate, using the same compression parameters as in the case of a single film. Obtained four reinforced with fabric layers differing in number of layers of fabric and two SBS copolymer coating with different thickness. Impact resistance test consisted of placing the sample of 100 x 100 mm in the base device, and then leaving from the height of 1 meter, a weight of 2 kg terminated spherical indenter having a diameter of 20 mm. All samples from a single impact energy of 19.62 J were subjected to microscopic analysis. The first step was to determine the number of impact, after which the steel substrate coating has been without a break. Then carried out research on coatings by measuring the amount of impact, which was interrupted after the structure of the coating and the steel substrate. As a result of the study, there was no linear relationship between the thickness of coatings and their impact resistance. A significant influence on the resulting damage after an impact is the amount of fabric coating.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2016, 4, 1; 6--10
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of fuel tracing on nanoparticles from a Diesel engine
Autorzy:
Czerwinski, J.
Mayer, A.
Wischer, A.
Powiązania:
https://bibliotekanauki.pl/articles/134232.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
diesel
emissions
nanoparticles
size distribution
composition of particles
silnik spalinowy
emisja
nanocząstki
rozkład wielkości
skład cząstek
Opis:
Nanoparticles from a HD-Diesel engine and their composition were investigated in the present paper. Three variants of fuel additivities were applied to allow the balances of certain tracer-substances after the tests: 2% of additives-free lube oil; 2% of market lube oil with additive package and Fe-based regeneration additive (FBC) with 40 ppm Fe. The analysed SMPS particle size distributions indicated that by blending of the market lube oil to the fuel the combined effects of metals or metal oxides from the additive packages and of the heavy HC’s from the lube oil matrix contribute the most to the increase of nuclei mode. From the masses of Fe, Zn and Ca, which were introduced with the fuel, only parts were found as integral masses at all ELPI-stages – Fe 43.5%, Zn 36.6%, Ca 65.5%. The majority of mass of some metals, or metal oxides emissions on ELPI-stages (up to 80%) is in the size ranges below 100 nm.
Źródło:
Combustion Engines; 2015, 54, 1; 3-10
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoparticle research on four gasoline cars
Autorzy:
Czerwinski, J.
Comte, P.
Mayer, A.
Powiązania:
https://bibliotekanauki.pl/articles/247977.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
gasoline cars
combustion engine
nanoparticles measurements (NP)
NP fluctuation
Opis:
The invisible nanoparticles (NP) from combustion processes penetrate easily into the human body through the respiratory and olfactory ways and carry numerous harmful health effects potentials. NP count concentrations are limited in EU for Diesel passenger cars since 2013 and for gasoline cars with direct injection (GDI) since 2014. The limit for GDI was temporary extended to 6 x 1012 #/km. Nuclei of metals as well as organics are suspected to significantly contribute especially to the ultrafine particle size fractions, and thus to the particle number concentration. In the present paper, some results of investigations of nanoparticles from four gasoline cars – an older one with MPI and three never with DI – are represented. The measurements were performed at vehicle tailpipe and in CVS-tunnel. The results show that the older vehicle with MPI emits high particle count concentrations. The size distributions of this vehicle are decisively bimodal with high numbers in nuclei mode. The emissions of the newer vehicles with DI show sometimes no typical uniform shape of particle size distributions and are at lower level, than for the older vehicle. There is no visible nuclei mode and the ultrafine particle concentrations below 10 nm are insignificant. Some of the newer, low-emitting vehicles show at constant speed operation a periodical fluctuation of the NPemissions. Increased NP-emissions at cold start were confirmed.
Źródło:
Journal of KONES; 2014, 21, 1; 49-57
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of the 2-stroke aerosol in the exhaust sampling system
Autorzy:
Czerwinski, J.
Comte, P.
Mayer, A.
Reutimann, F.
Powiązania:
https://bibliotekanauki.pl/articles/247914.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
scooters
two-stroke direct injection
carburettor
2-stroke aerosol
nanoparticulate emissions
Opis:
Nanoparticle emissions of two 2-stroke scooters were investigated along the exhaust- and CVS-system (Constant Volume Sampling) with closed and with open line (cone). Due to their technology, the scooters produce different kind of aerosol (state of oxidation & SOF-content) and in addition to that they were operated with and without oxidation catalyst. The scooters represent a modern technology with direct injection TSDI* ) (two stroke direct injection) and with carburettor. The tests were performed at two constant speeds of the vehicles (20 km/h & 40 km/h) according to the measuring procedures, which were established in the previous research in the Swiss Scooter Network. The nanoparticulate emissions were measured by means of SMPS (CPC) and NanoMet (abbreviations see at the end of this paper). The most important results are: - the changes of the PSD's of the aerosol along the exhaust and CVS-system are connected to the average gas temperature and PC-concentration, which result after the different dilution steps and cooling down in the connecting pipe, - in the "open" variant of exhaust gas extraction there is a dilution step with unfiltered ambient air directly after tailpipe. This causes a stop of agglomeration, reduction of diffusion loses and increased background NPconcentration. There is also lower post oxidation of CO & HC. In some cases spontaneous condensates due to the temperature drop are supposed, - with the "closed" variant there is a stronger reduction of SMPS PC's along the gas way, than with the open variant. This is to explain with the higher temperatures and concentrations in the closed system, which enable more intense thermophoresis - and diffusion losses, - the NP-concentrations measured with "open" variant are always higher, - most intense oxidation is observed with Peugeot Carb: due to the SAS, rich tuning and a relatively high temperature level there are oxidation effects already without catalyst (temp. approx. 350 centigrade). With catalyst the temperature is in the range of 400centigrade and the oxidation is so intense, that the particles are nearly eliminated. The type of sampling: "open", or "closed" as well as the sampling position in the exhaust installation have significant influence on the measured nanoparticles emission results.
Źródło:
Journal of KONES; 2012, 19, 2; 109-119
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 26

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