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Wyświetlanie 1-10 z 33
Autorzy:
Petrosillo, Nicola
Das, Koray
Spigaglia, Patrizia
Di Bella, Stefano
Di Carlo, Isidoro
Shelat, Vishal G.
Barbut, Frederic
Kluger, Yoram
Cherry-Bukowiec, Jill R.
Kim, Jae Il
Mazuski, John E.
Cocuz, Maria Elena
Caproli, Emanuele
Ferrada, Paula
Ivatury, Rao
To, Kathleen B.
Cook, Charles H.
Clanton, Jesse
Camacho-Ortiz, Adrian
Ghnnam, Wagih
Bala, Miklosh
Sartelli, Massimo
McFarland, Lynne V.
Gomes, Carlos Augusto
LaBarbera, Francis D.
Kelly, Ciaran P.
Raza, Mansoor
Fraga, Gustavo P.
Eckert, Catherine
Portela, Francisco
Ansaloni, Luca
Forrester, Joseph Derek
Malangoni, Mark A.
Sganga, Gabriele
Cui, Yunfeng
Lee, Jae Gil
Puri, Basant K.
Ray, Arnab
Frossard, Jean Louis
Biffl, Walter L.
Lee, Yeong Yeh
Furuya-Kanamori, Luis
Humphrey, Felicia
Brecher, Stephen M.
Abu-Zidan, Fikri M.
Herzog, Torsten
Gorrepati, Venkata
Alrahmani, Layan
Viale, Pierluigi
Karamarkovic, Aleksandar
Catena, Fausto
Coccolini, Federico
Cainzos, Miguel A.
Demetrashvili, Zaza
Lohsiriwat, Varut
Marwah, Sanjay
Augustin, Goran
Juang, Paul
Kim, Peter K.
Enani, Mushira Abdulaziz
Metan, Gokhan
Bhangu, Aneel
Timsit, Jean Francois
Tattevin, Pierre
Ordonez, Carlos A.
Ben-Ishay, Offir
Galeiras, Rita
Coimbra, Raul
Velmahos, George C.
Moore, Frederick Alan
Stewart, David B.
Faro, Mario
Di Saverio, Salomone
Eiland, Edward H.
Czepiel, Jacek
Uhl, Waldemar
Canterbury, Laura A.
Khanna, Sahil
Griffiths, Ewen A.
Nord, Carl Erik
Eckmann, Christian
Dumitru, Irina Magdalena
Trana, Cristian
Eltringham, Ian
Leppaniemi, Ari
Rems, Miran
Zahar, Jean Ralph
Vassallo, Angela
Chan, Shirley
Abdelsattar, Zaid M.
Isik, Arda
Sakakushev, Boris E.
Ahmed, Mohamed Hassan
van Goor, Harry
Urbanek, Libor
Moore, Ernest E.
Ko, Wen Chien
Pereira Junior, Gerson Alves
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Electrostatic Discharge Sensitivity and Resistivity Measurements of Al Nanothermites and Their Fuel and Oxidant Precursors
Autorzy:
Kelly, D.
Beland, P.
Brousseau, P.
Petre, C. F.
Tematy:
nanothermite
electrostatic discharge sensitivity
resonant acoustic mixing
nano aluminium
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:
https://bibliotekanauki.pl/articles/358130.pdf  Link otwiera się w nowym oknie
Opis:
The sensitivity of nanothermites to electrostatic discharge (ESD) has been noted by many authors. In the present work, nanothermites have been prepared using aluminium fuels with oxide (O-Al), palmitic acid (L-Al) and Viton (V-Al) passivation and CuO, Fe2O3 and MoO3 oxidants, as well as binary oxidant mixtures. Fuel- and oxidant-based ESD sensitivity trends of O-Al ≈ L-Al >> V-Al and MoO3 >> CuO ≈ Fe2O3 were observed with binary oxidants affording intermediate sensitivities. In the majority of cases, with the exception of high proportions of MoO3 oxidant, nanothermites containing V-Al fuel were the least sensitive to ESD at > 0.156 J. Resistivity measurements have been made for the fuels and oxidants and follow the trends V-Al >> O-Al ≈ L-Al and MoO3 >> Fe2O3 > CuO. V-Al resistivity of ca. 1011 Ω·cm exceeds that of the oxidants studied. An ESD sensitivity trend, based on a reduced proportion of spark current carried by the aluminium fuel, is proposed and was consistent with the observed ESD and resistivity data.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards an integrated Jurassic biostratigraphy for eastern Greenland
Autorzy:
Kelly, S. R. A.
Gregory, F. J.
Braham, W.
Strogen, D. P.
Whitham, A. G.
Tematy:
Jurassic
integrated biostratigraphy
ammonites
palynology
micropalaeontology
Greenland
Jur
biostratygrafia
amonity
palinologia
mikropaleontologia
Grenlandia
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2077318.pdf  Link otwiera się w nowym oknie
Opis:
The thick and relatively complete Jurassic succession of eastern Greenland provides a unique biostratigraphic record for the North Atlantic region. The main biostratigraphic control for the succession has been provided by molluscs, especially ammonites and to a lesser extent by bivalves and belemnites. The late John Callomon and colleagues recognised 93 Boreal ammonite-bearing horizons in the Mid to Late Jurassic. This provides a reliable backbone to the biostratigraphy of these strata, prompting a palynological colleague to comment that they are the “Policemen of Jurassic Stratigraphy”. Other biostratigraphically significant microfossil and palynological groups, can be calibrated against this standard, but on their own cannot achieve the same precision. The Early Jurassic of eastern Greenland does not have such fine control as later parts of the period. No single biostratigraphic group can be used successfully throughout the interval, and there are only three significant ammonite faunas during this period. Reliance on various different organisms is necessary to cope with the changing range of marine to non-marine environments. CASP field-work from 1990 to 2012 has resulted in the collection of much biostratigraphic material. In this article, published data are summarised together with previously unpublished data in the form of a unified table. The integrated chart shows detailed columns for the whole eastern Greenland Jurassic. It demonstrates the ammonite, palynological and microfossil events/biozones and horizons which are correlated by time. More limited information is available on belemnites, bivalves and macroflora. This is the first time such an integrated biostratigraphic scheme has been assembled for the Jurassic of eastern Greenland. It will be of value to the offshore oil-industry in the northern North Atlantic and on the Barents Shelf as well as to field geologists in Greenland.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boomerang and bones: refining the chronology of the Early Upper Paleolithic at Obłazowa Cave, Poland
Autorzy:
Casaccia, Nicole
Hublin, Jean-Jacques
Hajdinjak, Mateja
Benazzi, Stefano
Wacker, Lukas
Skoglund, Pontus
Tassoni, Laura
Nadachowski, Adam
Figus, Carla
Kraszewska, Anna
Skłucki, Jakub
Wiliams, Mia
Malegori, Cristina
Romandini, Mateo
Richards, Michael P.
Di Domenico, Giovanni
Tait, Frankie
Di Bernardo, Ginevra
Oliveri, Paolo
Talamo, Sahra
Sciutto, Giorgia
Kowal, Magda
Valde-Nowak, Paweł
Kelly, Monica
Picin Andrea
Vazzana, Antonino
Barrington, Christopher
Opis:
Beginning with the Early Aurignacian, Homo sapiens demonstrated an enhanced symbolic capacity, expanding artistic expressions from body decoration to portable art and aesthetically refined tools. These artistic endeavors, often intertwined with utilitarian purposes, have sparked debates regarding their symbolic versus functional roles. Among these remarkable artifacts is a complete mammoth tusk boomerang from Layer VIII of Obłazowa Cave, Poland, found in association with a human phalanx. Determining its precise chronology and cultural context is critical for understanding the emergence and variability of symbolic behaviors among early Homo sapiens groups in Europe. This study refines the chronology of the Early Upper Paleolithic occupation of Layer VIII at Obłazowa Cave through radiocarbon dating of several bones and the human fossil found near the ivory boomerang. Bayesian modeling places the site's main occupation phase between 42,810-38,550 cal BP (95,4% probability). The mammoth-ivory boomerang, calibrated to 42,290-39,280 cal BP with a 95.4% probability, emerges as one of Europe's oldest known examples of this complex tool, exemplifying technological and symbolic innovation at Obłazowa Cave. This multi-disciplinary research underscores the importance of integrating advanced methodologies to explore cultural practices during the Upper Paleolithic. The findings not only deepen our understanding of Homo sapiens' adaptive strategies but also highlight the nuanced interplay of technology, symbolism, and environmental interaction during the earliest phases of human dispersals in Central Europe.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 33

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