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Wyszukujesz frazę "tuf" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Effect of volcanic tuff on the engineering properties of compressed earth block
Autorzy:
Edris, W. F.
Jaradat, Y.
Al Azzam, A. O.
Al Naji, H. M.
Abuzmero, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/1818488.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
volcanic tuff
lime
interlocking
fibres
compressed earth block
tuf wulkaniczny
wapno
blokowanie
włókna
Opis:
Purpose: of this paper is to investigate the durability and the mechanical properties, including compressive and flexural strengths, of the locally compressed earth blocks manufactured from soil in Irbid, Jordan. Moreover, effect of volcanic tuff as new stabilizer material on properties of compressed earth block (CEB). Compressed earth block is a technique that was created to solve environmental and economic problems in construction sector. It is widespread in many countries around the world but hasn't been used in Jordan yet. Design/methodology/approach: 9 mixtures were carried out. One of this mixture is the control mix, beside other mixtures were performed by replacing soil with 40%, 10%, 10%, of sand, volcanic tuff, and lime respectively. In addition, polypropylene fibre was used. After 28 days of curing, the CEB were dried in oven at 105°C for 24 hours then tested. Findings: Show that absorption and erosion were decreased when the lime used in the soil. On the other hand, the fibres presence significantly improved the durability and mechanical properties in all mixtures. Moreover, the higher compressive strength was obtained in the mixtures which contain lime only while the higher tensile strength was obtained in the mixtures which contain lime with sand replacement. The using of volcanic tuffs produced average compressive strength values. The reason is that in the presence of lime and pozzolana (volcanic tuff) reactions take place at low and slow rate at early ages. Research limitations/implications: volcanic tuff can produce favourable compressive strengths at later ages and this is a point of interest in the future work. Originality/value: Searching for a new material as stabilizer material that improves the properties of the compressed earth block (CEB).
Źródło:
Archives of Materials Science and Engineering; 2020, 106, 1; 5--16
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kopalnia Schwarze Minna
Schwarze Minna
Autorzy:
Maciejak, K.
Maciejak, M.
Powiązania:
https://bibliotekanauki.pl/articles/122235.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
historia górnictwa
węgiel brunatny
tuf
Sichów
Dolny Śląsk
mining history
lignite
tuff
Lower Silesia
Opis:
Autorzy omawiają rozwój niewielkiego ośrodka górniczego „Schwarze Minna” pod Sichowem pomiędzy Złotoryją a Jaworem. Przyczynkiem do powstania artykułu było utworzenie się w 2013 r. koło wsi owalnego zapadliska. Rejon Sichowa, zwłaszcza przy krawędzi uskoku brzeżnego sudeckiego, znany był w przeszłości z eksploatacji rud żelaza, miedzi, ołowiu i barytu. Jednak działalność ta nie sięgała aż do wschodnich granic miejscowości. Badania terenowe, kwerenda kartograficzna i biblioteczna pozwoliły na odtworzenie nieznanej szerzej karty z historii górnictwa węgla brunatnego w tej części Dolnego Śląska.
The Schwarze Minna coal mine was opened between 1854 and 1855 and functioned for a period of at least 10 years. Initially lignite was mined; its deposit was, however, disturbed by tertiary basaltic volcanism. Once the lack of profitability of mining coal has been determined, as the deposit was established to be irregular and highly nodular, the mining company initiated an attempt to extract and market ground trass-like volcanic tuff as affordable building material of good quality and a substitute for mortar. The discovery of coal and fossil remains in volcanic tuffs between Chroślice and Sichów was of certain significance in the XIX century’s geology, and was researched as such by established scholars of that age who contributed to furthering the geological knowledge about that particular part of Lower Silesia.
Źródło:
Hereditas Minariorum; 2015, 2; 85-98
2391-9450
2450-4114
Pojawia się w:
Hereditas Minariorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of malacological analysis in local and regional palaeoenvironmental reconstructions - a study from the Holocene of Łapsze Niżne (Podhale, southern Poland)
Autorzy:
Alexandrowicz, W. P.
Szymanek, M.
Rybska, E.
Powiązania:
https://bibliotekanauki.pl/articles/139354.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
calcareous tufa
peat
molluscs
environment
Holocene
Podhale
southern Poland
martwica wapienna
tuf wapienny
torf
mięczaki
środowisko
holocen
Polska Południowa
Opis:
This malacological analysis was conducted at a site with peat and calcareous tufas in Łapsze Niżne, Podhale (southern Poland). The study was carried out in 6 main and several complementary sections, in which 37 mollusc species were recognized represented by almost 11 000 specimens. The study enabled the reconstruction of environmental changes during the accumulation of the Holocene deposits (from the Boreal Phase till present). Conclusions drawn from these reconstructions were compared with results of malacological and palynological studies from other sites in Podhale. As a result, regional environmental reconstructions for the Holocene of the area were made. The specific composition, ecological structure and succession of molluscan assemblages from Łapsze Niżne indicate a significant role for local factors, thus demonstrating the variability of environmental conditions within a geographic region.
Źródło:
Acta Geologica Polonica; 2018, 68, 1; 89-105
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potencjał geoturystyczny wybranych obiektów Ojcowskiego Parku Narodowego i jego otuliny
Geotouristic potential of selected objects in the Ojców National Park and its protected zone area (S Poland)
Autorzy:
Dzięgiel, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/20204843.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geoturystyka
Oksford górnojurajski
skalisty wapień
kras
tuf wapienny
less
geotourism
Upper Jurassic Oxfordian rocky limestone
karst
calcareous tufa
loess
Opis:
In this paper, two scenic caves, five selected karst rock forms, and five rock outcrops situated in the Ojców National Park and its protected zone area are the subject of comparative research, considered as very essential examples of geotouristic potential. Most of their karst forms differ between each other. These include Łokietek and Ciemna (Dark) cave, Kraków Gate, Rękawica and Igła Deotymy rock-cliff at Ojców, Duży Pochylec rock-cliff in Skała, and Maczuga Herkulesa rocky tower at Pieskowa Skała. Apart from them, outcrops of Quaternary calcareous tufa and rock falls at Ojców, an abrasion surface cutting Upper Jurassic limestones and covered with Cretaceous limestones and marls, Pleistocene loess at Januszowice, and the Duże Skałki (Big Rocks) former quarry of Upper Jurassic limestone at Czajowice were also studied. All of them are situated in the Silesian-Kraków Monocline. The caves, rock-cliffs and Maczuga Herkulesa rocky tower developed in the Upper Jurassic Oxfordian massive limestone. Their karst forms are diverse and picturesque. The other objects selected for research are also very interesting and important examples, displaying products of very complex geological processes. The comparative geotouristic potential evaluation of all 12 objects was made to meet tourists', educators' and investors' expectations and needs to increase their geotouristic development level. The statistical data of the annual number of visitors at the described two caves is also discussed. In general, interest in them as geotouristic abiotic nature objects has been growing regularly until today. They have become very widely known in Poland. Moreover, the Łokietek Cave, Kraków Gate rock-cliff and Maczuga Herkulesa rocky tower have become very popular worldwide.
Źródło:
Przegląd Geologiczny; 2023, 71, 3; 113-131
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of phytoplasmas related to ‘Candidatus Phytoplasma asteris’ subgroup rpI-L in Iran
Autorzy:
Vali-Sichani, F.
Bahar, M.
Zirak, L.
Powiązania:
https://bibliotekanauki.pl/articles/66181.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phytoplasma
disease symptom
plant
disease
polymerase chain reaction
seed
Candidatus Phytoplasma asteris
rpI-L subgroup
rp gene
tuf gene
Iran
Opis:
In two of Iran's central provinces, several herbaceous plants showing phytoplasma disease symptoms were collected to detect 'Canididatus Phytoplasma asteris'-related phytoplasmas. Confirmation of an association of phytoplasmas with diseased plants was done using polymerase chain reaction (PCR) assays having the phytoplasma universal primer pairs P1/P7 followed by R16F2n/ R16R2 in nested PCR. Then, for detection of 'Ca. P. asteris', DNA samples were subjected to amplification of rp and tuf genes using specific primer pairs rp(I)F1A/rp(I)R1A and fTufAy/rTufAy, respectively. Restriction fragment length polymorphism or RFLP analyses of rp gene fragments using Tsp509I restriction enzyme as well as sequence analyses indicated that 'Ca. P. asteris'-related phytoplasmas associated with carrot, niger seed and scallion plants in these regions, belong to the rpI-L subgroup. This research is the first report of carrot, niger seed, and scallion infection with phytoplasmas belonging to the rpI-L subgroup.
Źródło:
Journal of Plant Protection Research; 2014, 54, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Promieniotwórczość naturalna skał paleozoicznych z rejonu Krzeszowic
Natural radioactivity of the Paleozoic rocks from the area of Krzeszowice (southern Poland)
Autorzy:
Malczewski, D.
Badera, J.
Lizurek, G.
Mirkowski, Z.
Dorda, J.
Powiązania:
https://bibliotekanauki.pl/articles/2074494.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
skała paleozoiczna
tuf wulkaniczny
promieniotwórczość naturalna
badanie in situ
Paleozoic rocks
tuff
melaphyre
porphyry
diabase
limestone
natural radioactivity
in situ gamma-ray spectrometry
Krzeszowice
Polska
Opis:
In this paper results of natural radioactivity of 40K, 208Tl, 212Pb, 212Bi, 214Pb, 214Bi and 228Ac in common rocks raw materials mined in the Krakow vicinity measured in situ using a portable gamma-ray spectrometry are presented. The study area occupies the SE edge of regional geologic unit called Krakow–Lubliniec Zone. Most Upper Paleozoic rocks exposed in this area like tuff, porphyry, limestone, dolomite, diabase and melaphyre have great economic importance and are used in building and road construction industry. The activity concentrations of 40K for the measured Paleozoic rocks ranged from 53 Bq/kg (Carboniferous limestone) to 3150 Bq/kg (Permian tuff). The activity concentrations associated with 228Ac (232Th) varied from about 7 Bq/kg (Carboniferous limestone) to 56 Bq/kg (Permian tuff), whereas activity concentrations of 226Ra (238U) ranged from 19 Bq/kg (Devonian dolomite) to 43 Bq/kg (Devonian limestone). Besides, the natural radioactivity of the Jurassic limestones (widespread in this region) was measured for comparision with Devonian and Carboniferous limestones.
Źródło:
Przegląd Geologiczny; 2006, 54, 9; 815-822
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magmatic episodes in the Holy Cross Mountains, Poland – a new contribution from multi-age zircon populations
Epizody magmowe w Górach Świętokrzyskich – nowe dane o populacjach cyrkonu różnego wieku
Autorzy:
Krzemińska, Ewa
Krzemiński, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/2061589.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
U-Pb geochronology
zircon
antecrysts
xenocrysts
diabase
lamprophyre
tuff
Łysogóry region
Kielce Region
geochronologia U-Pb
cyrkon
antekryształy
ksenokryształy
diabazy
lamprofiry
tuf
region łysogórski
region kielecki
Opis:
This contribution reports on new U-Pb zircon age data from magmatic rocks from the Holy Cross Mountains (HCM) of Poland. The analyzed samples were taken from lamprophyre and diabase veins of Podkranów and Janowice-2 as well as from tuff horizon of Kielce Beds (Ludlow). Internal morphologies have been investigated by SEM-BSE and cathodoluminescence images and they have been used as a guide for the selection of genetically various type of grains, e.g. potential auto-, ante- and xenocrysts, that were analyzed by ion microprobe. The U-Pb age of the magmatic events at 414.2 ±6.6 Ma (Kielce tuff), 322 ±12 Ma (Podkranów, lamprophyre), and 300±10 Ma (Janowice-2, diabase) confirmed the time frame of known magmatic activity reported within the HCM, as determined by 40Ar/39Ar geochronology in previous studies. The zircon investigation revealed also multiple populations with record of an earlier pulse of magma system (antecrysts), as well as abundant xenocrysts.
W artykule przedstawiono nowe oznaczenia wieku U-Pb cyrkonu w skałach magmowych z obszaru Gór Świętokrzyskich (HCM). Próbki pobrano z żył lamprofiru i diabazu z Podkranowa i Janowic-2 oraz z poziomu tufu w warstwach kieleckich (ludlow). Morfologię i wewnętrzne cechy budowy ziaren zbadano za pomocą obrazów SEM-BSE i katodoluminescencji SEM, stosując je jako przewodnik do selekcji genetycznie różnych typów ziaren, potencjalnych auto-, ante- i ksenokryształów, które były analizowane na mikrosondzie jonowej. Wiek U-Pb epizodów magmowych, 414,2 ±6,6 Ma (Kielce, tuf), 322 ±12 Ma (Podkranów, lamprofir) i 300 ±10 Ma (Janowice-2, diabaz), potwierdza znane z wcześniejszych publikacji ramy czasowe aktywności magmowej na obszarze HCM oznaczone metodą 40Ar/39Ar. Badania wieku U-Pb cyrkonu ujawniły także szereg populacji z zapisem wcześniejszych impulsów magmowych (antekryształy) i licznych ksenokryształów.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2019, 474; 43--57
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność cech fizycznych i chemicznych wód źródlanych w zlewni Zagórzańskiego Potoku (Pogórze Spisko-Gubałowskie)
Variability of physical and chemical properties of spring water in the Zagórzański Stream catchment (Spisko-Gubałowskie Foothills)
Autorzy:
Czarny, Gabriela
Pociask-Karteczka, Joanna
Nieckarz, Zenon
Powiązania:
https://bibliotekanauki.pl/articles/2076173.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
tuf wapienny
zbiorowiska Cratoneurion
wody gruntowe
izotopy promieniotwórcze
Holocen
hydroturystyka
ochrona przyrody
Podhale
Karpaty
calcareous tufa
Cratoneurion commutati
groundwater
radioactive isotops
Holocene
hydro-tourism
nature protection
Podhale Basin
Carpathian Mountains
Opis:
The aim of the paper is to examine the variability of physical and chemical characteristics of two springs located in the Zagórzański Stream catchment (Spisko-Gubałowskie Foothills, Podhale region). Calcareous tufa occurs at one of the investigated springs. Field studies were conducted once a month from 25th March 2017 to 28thFebruary 2018. Water of the studied springs represents the bicarbonate-calcium-magnesium type during almost the whole year. The chemical composition of both springs is characterized by seasonal variability. The highest concentrations of most ions occurred in the summer, when the rainfall was the lowest and during winter drought; while the lowest concentration - in the period of increased rainfall. The variability of physical and chemical parameters of the spring with tufa is smaller than the other one. The spring with calcareous tufa stands out by the higher concentration of Mg2+ and SO42- and the presence of radon. The unique landscape values of the surroundings and hydrogeochemical features of the spring with calcareous tufa favour this place as an interesting hydro-tourism attraction in the Bukowina Tatrzańska region.
Źródło:
Przegląd Geologiczny; 2021, 69, 3; 150--160
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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