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Tytuł:
Design of Honeycomb Structures Produced by Investment Casting
Autorzy:
Naplocha, K.
Dmitruk, A.
Mayer, P.
Kaczmar, J. W.
Powiązania:
https://bibliotekanauki.pl/articles/382969.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
investment casting
3D printing
honeycomb design
light structure
odlewnie
drukowanie 3d
projekt plaster miodu
plaster miodu
lekkie konstrukcje
Opis:
Investment casting combined with the additive manufacturing technology enables production of the thin-walled elements, that are geometrically complex, precise and can be easy commercialized. This paper presents design of aluminium alloy honeycombs, which are characterized with light structure, internal parallel oriented channels and suitable stiffness. Based on 3D printed pattern the mould was prepared from standard ceramic material subjected subsequently to appropriate heat treatment. Into created mould cavity with intricate and susceptible structure molten AC 44200 aluminium alloy was poured under low pressure. Properly designed gating system and selected process parameters enabled to limit the shrinkage voids, porosities and misruns. Compression examination performed in two directions showed different mechanisms of cell deformation. Characteristic plateau region of stress-strain curves allowed to determine absorbed energy per unit volume, which was 485 or 402 J/mm3 depending on load direction. Elaborated technology will be applied for the production of honeycomb based elements designated for energy absorption capability.
Źródło:
Archives of Foundry Engineering; 2019, 4; 76-80
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green propulsion research at TNO the Netherlands
Badania nad ekonapędem w TNO w Holandii
Autorzy:
Mayer, A.
Wieling, W.
Powiązania:
https://bibliotekanauki.pl/articles/36391787.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
green propulsion
monopropellant
bipropellant
hydrogen peroxide
nitromethane
napęd ekologiczny
nadtlenek wodoru
nitrometan
Opis:
This paper describes the recent theoretical and experimental research by the Netherlands Organisation for Applied Scientific Research (TNO) into green replacements for hydrazine, hydrazine derivatives and nitrogen tetroxide, as propellants for inspace propulsion. The goal of the study was to identify propellants that are capable of outperforming the current propellants for space propulsion and are significantly less hazardous for humans and the environment. Two types of propellants were investigated, being monopropellants and bipropellants. The first section of the paper discusses the propellant selection. Nitromethane was found to be the most promising monopropellant. As bipropellant, a combination of hydrogen peroxide (HP) and ethanol was selected, where the ethanol is rendered hypergolic with hydrogen peroxide. The second part of the paper describes the experimental verification of these propellants by means of engine testing. Initiation of the decomposition of nitromethane was found to be problematic, hypergolic ignition of the hydrogen peroxide and ethanol bipropellant however was successfully demonstrated.
W niniejszym artykule opisano wyniki najnowszych teoretycznych i eksperymentalnych badań Holenderskiej Organizacji Stosowanych Badań Naukowych (TNO) na rzecz ekologicznych zamienników hydrazyny, pochodnych hydrazyny i tetratlenku diazotu, jako materiałów do napędu rakietowego. Celem badań była identyfikacja materiałów napędowych, mogących osiągnąć lepsze wyniki niż obecne paliwa rakietowe i będąc jednocześnie mniej niebezpiecznymi dla ludzi i środowiska. Zadano dwa typy materiałów pędnych, tak zwane „monopropellant” i „bipropellant”. W pierwszej części artykułu omówiono wybór materiału pędnego. Nitrometan okazał się najbardziej obiecującym materiałem typu „monopropellant”. Jako „bipropellant” wybrano połączenie nadtlenku wodoru (HP) i etanolu, w którym etanol zmodyfikowano hypergolicznie nadtlenkiem wodoru. W drugiej część artykułu opisano eksperymentalną weryfikację zastosowania materiałów napędowych za pomocą testów silnika. Pomimo początkowych problemów z rozkładem nitrometanu, udowodniono hipergoliczny zapłon nadtlenku wodoru i zademonstrowano „bipropellant” etanolowy.
Źródło:
Transactions on Aerospace Research; 2018, 4 (253); 5-32
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PN-emissions with increased lube oil consumption of GDI car with/without GPF
Autorzy:
Czerwinski, J.
Comte, P.
Güdel, M.
Kurzwart, M.
Mayer, A.
Powiązania:
https://bibliotekanauki.pl/articles/245468.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
PN-emissions
road transport
combustion engine
air pollution
environmental protection
normy emisji
transport drogowy
silnik spalinowy
zanieczyszczenie powietrza
ochrona środowiska
Opis:
The particle number (PN) emissions are increasingly considered in the progressing exhaust gas legislation for onand off- road vehicles. The invisible nanoparticles penetrate like a gas into the living organisms and cause several health hazards. The present paper shows how the PN- and gaseous emissions of a modern GDI (Abbreviations see at the end of this paper) vehicle change, when there is an in-creased lube oil consumption. What are the potentials of a gasoline particle filter to reduce the emissions? The lube oil consumption was simulated by mixing 2% vol. lube oil into the fuel. A non-coated GPF was mounted at tailpipe, so only the filtration effects were indicated. The tests were performed at transient (WLTC) and at stationary (SSC) operating conditions. It has been shown that the increased lube oil consumption significantly increases the PN-emissions and the applied high quality GPF eliminates these emissions very efficiently.
Źródło:
Journal of KONES; 2017, 24, 1; 102-112
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of emissions of reactive substances NO2 and NH3 from passenger cars
Autorzy:
Czerwinski, J.
Comte, P.
Güdel, M.
Lemaire, J.
Mayer, A.
Heeb, N.
Berger, H.
Reutimann, F.
Powiązania:
https://bibliotekanauki.pl/articles/133799.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
exhaust emissions
reactive substances
NO2
NH3
emisje spalin
substancje reaktywne
Opis:
Public concern and complaints regarding ambient air in zones of dense traffic pertains to two compounds of nitrogen, nitrogen dioxide (NO2) and ammonia (NH3); both are toxic and strongly irritant, such that legal limitations are under discussion. This paper contributes to measuring methods as already in part proposed by GRPE subgroup WLTP-DTP (Worldwide Light Duty Test Procedures – Diesel Test Procedures) for NO2. Despite legally lowered NOx emission levels, lumping both, NO2 and NO, levels of NO2 have risen in cities and agglomerations as a result of both, deployed catalytic exhaust after-treatment devices and low sulphur Diesel fuels. In present tests two different combinations of NO2 measuring methods as proposed by WLTP were checked on Diesel cars for practicability in handling and accuracy. These integral, indirect methods (NO2 = NOx – NO) have been found as useful tools for estimate of NO2 and with use of appropriate analyzers a satisfactory accuracy was attained. Furthermore, attention was brought to ammonia (NH3) emitted by gasoline engines with three way catalysts (TWC) which ought not to be ignored while on the other hand SCR systems for Diesel engines are strictly regulated. Emission levels of more recent TWC turned out to be mostly below 20 ppm NH3. Vehicle of older technology exhibited significantly higher levels, about 10 times more. As chemical reactions depend on pressure and temperature (= i.e. flow condition in CVS-tunnel) as well as concentrations, doubts need to be considered on accuracy of results based on chemical reactive substances. Nevertheless, clear tendencies regarding changes of concentrations of NO2 and NH3 along the path-way could not be observed.
Źródło:
Combustion Engines; 2016, 55, 3; 24-33
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
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:
Study of soil aggregate breakdown dynamics under low dispersive ultrasonic energies with sedimentation and X-ray attenuation
Autorzy:
Schomakers, J.
Zehetner, F.
Mentler, A.
Ottner, F.
Mayer, H.
Powiązania:
https://bibliotekanauki.pl/articles/24254.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2015, 29, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of nanoparticle emissions of two gasoline cars MPI & DI at stationary part load operation
Emisja nanocząstek z dwóch pojazdów wyposażonych w silniki ZI – MPI i DI w warunkach stacjonarnych przy częściowym obciążeniu
Autorzy:
Czerwiński, J.
Comte, P.
Keller, A.
Mayer, A.
Powiązania:
https://bibliotekanauki.pl/articles/133666.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
nanoparticles
emission standards
ambient air limits
health benefits
nanocząstki
limity emisji
normy jakości powietrza
korzyści zdrowotne
Opis:
Starting from Euro 6 not only for diesel but also for gasoline vehicles, with direct injection technology (GDI) a solid particle number emissions limit of 6 × 1011#/km becomes effective. The limit was temporary extended for GDI 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 project GasOMeP (Gasoline Organic & Metal Particulates) metal-nanoparticles (including sub 20 nm) from gasoline cars are investigated for different engine technologies. In the present paper some results of basic investigations of nanoparticles from two gasoline cars – an older one with MPI and a never one with DI – are represented. The measurements were performed at vehicle tailpipe, with varying sampling conditions and with different SMPS-systems, which enabled the mobility scanning in different size ranges. The results show that the older vehicle with MPI emits high particle count concentrations. The size distributions are decisively bimodal with high numbers in nuclei mode. In this case, the particle counting below 10 nm yields important information. The emissions of the newer vehicle with DI show 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. A sampling with a strongly increased primary dilution has a clear influence on the indicated (higher) particle concentrations.
Począwszy od normy Euro 6 wprowadzone zostanie ograniczenie emisji cząstek stałych do 6 × 1011#/km nie tylko dla pojazdów wyposażonych w silniki ZS, ale także dla pojazdów z silnikami ZI z bezpośrednim wtryskiem paliwa (GDI). Dopuszczalna liczba cząstek stałych emitowanych przez pojazdy wyposażone w silniki GDI była tymczasowo zwiększona do 6 × 1012#/km. Cząstki metali, jak również substancje organiczne prawdopodobnie są powodem emisji bardzo małych cząstek stałych, przyczyniając się do zwiększenia liczby emitowanych cząstek stałych. W projekcie GasOMeP (cząstki organiczne i metalowe z silników benzynowych) badana jest emisja nanocząstek metali (również o średnicy < 20 nm) z samochodów wyposażonych w silniki benzynowe różnych generacji. W artykule przedstawiono wyniki badań emisji nanocząstek z dwóch samochodów wyposażonych w silniki benzynowe – starszy z wtryskiem MPI i nowszy z wtryskiem DI. Spaliny pobierano z układu wylotowego pojazdu przy różnych warunkach pomiarowych i z wykorzystaniem urządzeń do pomiaru emisji cząstek stałych o różnych zakresach pomiarowych. Wyniki badań wskazują, że stężenie cząstek stałych w spalinach starszego pojazdu z wtryskiem MPI jest duże. Rozkłady wielkości mają charakter bimodalny z dużymi wartościami w fazie nukleacji. Wtedy istotny jest pomiar liczby cząstek stałych o średnicy mniejszej niż 10 nm. Emisja z pojazdu z wtryskiem typu DI nie wykazuje typowego jednolitego kształtu rozkładu wymiarowego, również liczba cząstek stałych jest mniejsza niż z pojazdu starszego. Nie zauważono znaczącej emisji cząstek w fazie nukleacji, a stężenia cząstek najmniejszych o średnicy poniżej 10 nm są nieznaczne. Pobór próbki spalin przy zastosowaniu dużego współczynnika rozcieńczenia ma zauważalny wpływ na zwiększenie stężenia cząstek stałych.
Źródło:
Combustion Engines; 2014, 53, 3; 3-11
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:
NOX-reduction on HD-vehicles-low cost quality check
Autorzy:
Czerwinski, J.
Zimmerli, Y.
Mayer, A.
Heeb, N.
Berger, H.
D‘Urbano, G.
Powiązania:
https://bibliotekanauki.pl/articles/246300.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Diesel particle filter
regeneration of DPF
non-legislated emissions
selective catalytic reduction SCR
NOx-reduction
SCR-quality testing
on vehicle testing
Opis:
The NOx reduction of recent HD-vehicle is performed mostly by means of the selective catalytic reduction SCR. There are some manufactures and some applications of SCR as retrofit systems (mostly for the low emission zones LEZ and in combination with a DPF). In charge of Swiss authorities AFHB investigated several SCR-systems, or (DPF+SCR)-systems on HD-vehicles and proposed a simplified quality test procedure of those systems. This procedure can especially be useful for the admission of retrofit systems but it can also be helpful for the quality check of OEM-systems. In the present paper the test procedures will be described and some examples of specific results will be presented. As general conclusions it can be stated: – the foundations for the quality verification procedures of SCR-systems are established, – the SCR-systems are not active at lower temperatures < 200°C, – SCR-testing on vehicle is a simple & low-cost tool for quality check, – the overall average NOx reduction rate depends on the operating profile of the vehicle – for low-load, for cold operation and for interrupted operation (HEV) there are lower NOx reduction efficiencies.
Źródło:
Journal of KONES; 2013, 20, 2; 61-68
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
Tytuł:
Isotopic Re-Os age of molybdenite from the Szklarska Poręba Huta Quarry (Karkonosze, SW Poland)
Autorzy:
Mayer, W.
Creaser, R. A.
Mochnacka, K.
Oberc-Dziedzic, T.
Pieczka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2059392.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Karkonosze granite
hydrothermal mineralisation
Re/Os isotopic age
Opis:
New Re/Os isotopic data for molybdenite from the Szklarska Poręba Huta Quarry provide ages of 307 ± 2 Ma and 309 ± 2 Ma, respectively. The quarry is dominated by the porphyritic (“central”) and equigranular (“ridge”) varieties of the Karkonosze granite. Ore mineralisation hosted in aplogranite includes an assemblage of sulphides, sulphosalts, oxides and various rare phases. The molybdenite ages obtained are consistent with a previously published isotopic age of leucogranite (aplogranite?) from the same quarry and are only slightly older than a recently published, refined 2 6Pb/238U age of untreated zircons from the Szklarska Poręba Huta porphyritic granite. The age of the molybdenite corresponds moderately well to the younger stage of post-magmatic, pneumatolitic/hydrothermal activity of the Karkonosze granite (about 312 Ma).
Źródło:
Geological Quarterly; 2012, 56, 3; 505--512
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ore mineralization in the Miedzianka area (Karkonosze-Izera Massif, the Sudetes, Poland): new information
Autorzy:
Mochnacka, K.
Oberc-Dziedzic, T.
Mayer, W.
Pieczka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2086527.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Miedzianka
Ciechanowice
Przybkowice
Karkonosze-Izera Massif
ore deposits
mineral succession
geothermometry
Opis:
The Miedzianka mining district has been known for ages as a site of polymetallic ore deposits with copper and, later, uranium as the main commodities. Although recently uneconomic and hardly accessible, the Miedzianka ores attract Earth scientists due to the interesting and still controversial details of their ore structure, mineralogy and origin. Our examination of the ore mineralization from the Miedzianka district was based exclusively on samples collected from old mining dumps located in the vicinity of Miedzianka and Ciechanowice, and on samples from the only available outcrop in Przybkowice. In samples from the Miedzianka field, chalcopyrite, pyrite, galena, bornite, chalcocite, digenite, arsenopyrite, magnetite, sphalerite, tetrahedrite-tennantite, bornite, hematite, martite, pyrrhotite, ilmenite, cassiterite and covellite are hosted in quartz-mica schists and in coarse-grained quartz with chlorite. In the Ciechanowice field, the ore mineralization occurs mainly in strongly chloritized amphibolites occasionally intergrown with quartz and, rarely, with carbonates. Other host-rocks are quartz-chlorite schist and quartzites. Microscopic examination revealed the presence of chalcopyrite, pyrite, sphalerite, galena, tetrahedrite-tennantite, bismuthinite, native Bi, arsenopyrite, löllingite, cassiterite, cobaltite, gersdorffite, chalcocite, cassiterite, bornite, covellite, marcasite and pyrrhotite. Moreover, mawsonite and wittichenite were identified for the first time in the district. In barite veins cross-cutting the greenstones and greenschists in Przybkowice, we found previously-known chalcopyrite, chalcocite and galena. The composition of the hydrothermal fluids is suggested to evolved through a series of consecutive systems characterized, in turn, by Ti-Fe-Sn, Fe- As-S, Fe-Co-As-S, Cu-Zn-S and, finally, Cu-Pb-Sb-As-Bi compositions.
Źródło:
Mineralogia; 2012, 43, 3/4; 155--178
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results of sulphur isotope studies on sulfides from selected ore deposits and occurrences in the Karkonosze–Izera Massif (the Sudety Mts., Poland)
Autorzy:
Mayer, W.
Jędrysek, M.O.
Górka, M.
Drzewicki, W.
Mochnacka, K.
Pieczka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2086529.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Karkonosze-Izera Massif
sulphur isotope studies
polymetallic mineralization
Opis:
Preliminary sulphur isotope data are presented for selected ore deposits and occurrences in the Karkonosze-Izera Massif, namely, polymetallic mineralization sites at Budniki, Ciechanowice, Izerskie Garby and Sowia Dolina, and the pyrite deposit at Wieściszowice. The data reveal two populations of δ34S values: from 2.74 to 3.95‰ (pyrrhotites and pyrites in Sowia Dolina, and some pyrites in Wieściszowice) and from 0.79 to 1.8‰ (pyrites in Budniki, Ciechanowice and Izerskie Garby, and some pyrites from Wieściszowice). All of the data are indicative of endogenic sulphur typical of hydrothermal mineralization despite the genetic differences between the sites.
Źródło:
Mineralogia; 2012, 43, 3/4; 213--222
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of soil aggregate stability using low intensity ultrasonic vibrations
Autorzy:
Schomakers, J.
Mentler, A.
Steurer, T.
Klik, A.
Mayer, H.
Powiązania:
https://bibliotekanauki.pl/articles/24235.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil aggregate
stability
low intensity vibration
ultrasonic vibration
cavitation limit
carbon distribution
tillage
ultrasonic dispersion
ultrasonic method
Źródło:
International Agrophysics; 2011, 25, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on magnetite and pyrite mineralization, and on their early Palaeozoic ocean-floor host-rocks from the Leszczyniec Unit (West Sudetes, Poland)
Autorzy:
Oberc-Dziedzic, T.
Mochnacka, K.
Mayer, W.
Pieczka, A.
Creaser, R. A.
Góralski, M.
Powiązania:
https://bibliotekanauki.pl/articles/191471.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
magnetite and pyrite mineralization
metabasites
ocean-floor metamorphism
paragonite
Leszczyniec Unit
Sudetes
Polska
Opis:
The Leszczyniec Unit extends along the eastern margin of the Karkonosze-Izera Massif. It comprises the Early Palaeozoic, MORB-like Leszczyniec complex composed of metabasites, metagranites and metasedi- ments. The metabasites host magnetite mineralization encountered in Jarkowice, whereas near Wieściszowice village the pyrite deposit occurs in metasediments and metabasites. The common feature of both sites is the almost complete absence of the accompanying ore minerals. Basing on petrographic, mineralogical, geochemical and microstructural studies, it was found that the metabasic rocks, which host magnetite mineralization, were lava flows, whereas the protoliths of pyrite-bearing schists were basic and acid tuffites accompanied by ocean-floor basalts. The igneous rocks from the Leszczyniec Unit were subjected to the ocean-floor metamorphism, whereas the accompanying sediments were altered by hydrothermal fluids enriched in sulphur ions, which reacted with iron derived from the sediment and promoted crystallization of pyrite. The sources of hydrothermal fluids were adjacent magmatic centres. The estimated age ~480 Ma for pyrite (Re-Os method) is similar to the previously known ~500 Ma age of metabasites (U-Pb, zircon method) from the Leszczyniec Unit, which establishes a temporal link between pyrite accumulation and the ocean-floor environment. The rocks of the Leszczyniec Unit, first altered by the ocean-floor metamorphism and the hydrothermal fluids, were subsequently subjected to the regional metamorphism at 360–340 Ma and the two-stage deformations of various intensities, followed by the third stage of deformations which caused the reorientation of the regional foliation. The zones of ductile and brittle deformations connected with the second deformation event host the accumulations of magnetite formed at the expense of Fe-bearing rock-forming minerals or from iron supplied from adjacent sources. In the pyrite-bearing schists, mineral assemblages formed during the hydrothermal alteration have been subjected to recrystallization and were included into domains defining foliation and lineation, which formed during the first stage of deformation. Pyrite crystals were affected by both deformation stages. At the end of the second stage, the invasion of fluids led to the dissolution of pyrite crystals and to the filling of cracks in pyrite crystals with chalcopyrite and tennantite. This process was followed by the formation of quartz veins with minor amounts of ore minerals.
Źródło:
Annales Societatis Geologorum Poloniae; 2011, 81, No 2; 133-160
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
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