Results 21 to 30 of about 500,009 (287)
Dynamic Accumulation of the Quaternary Shale Biogas in Sanhu Area of the Qaidam Basin, China
Energies, 2022 Biogas resources in the Sanhu area of the Qaidam Basin have great potential, but there are few studies on biogas from shale, especially on the accumulation conditions of shale biogas. The study of biogas accumulation conditions of quaternary shale in the
Zeyu Shao +8 more
doaj +1 more source
Palladium-Catalyzed Asymmetric Conjugate Addition of Arylboronic Acids to Five-, Six-, and Seven-Membered β-Substituted Cyclic Enones: Enantioselective Construction of All-Carbon Quaternary Stereocenters [PDF]
, 2011 The first enantioselective Pd-catalyzed construction of all-carbon quaternary stereocenters via 1,4-addition of arylboronic acids to β-substituted cyclic enones is reported. Reaction of a wide range of arylboronic acids and cyclic enones using a catalyst
Gatti, Michele +3 more
core +2 more sources
Geosciences, 2019 Tana di Badalucco cave is located in Imperia (Liguria, Italy), not far from the French border. This site is scarcely known and it has never been studied accurately, even though different archaeological excavations have returned really important elements,
Eleonora Sessa +6 more
doaj +1 more source
On the identity of broad-shelled mussels (Mollusca, Bivalvia, Mytilus) from the Dutch delta region [PDF]
, 2011 Late Quaternary (Eemian) deposits of the Netherlands contain shells that resemble those of living Mytilus galloprovincialis. Similar broad-shelled mytilids also occur in estuaries of the southwestern Netherlands together with slender individuals typical ...
Bos, M.M. +9 more
core +3 more sources
Additive Quaternary Codes Related to Exceptional Linear Quaternary Codes [PDF]
IEEE Transactions on Information Theory, 2020 We study additive quaternary codes whose parameters are close to those of the extended cyclic [12; 6; 6]4-code or to the quaternary linear codes generated by the elliptic quadric in PG(3; 4) or its dual. In particular we characterize those codes in the category of additive codes and construct some additive codes whose parameters are better than those ...
Jurgen Bierbrauer +2 more
openaire +2 more sources
Analysis of the gain distribution across the active region of InGaAs-InAlGaAs multiple quantum well lasers [PDF]
, 2005 Spectral gain measurements for two InGaAs-InAlGaAs multiple width quantum well structures, with inverse-configured active regions, have been presented. One structure consisted of wide quantum wells near the p-side and narrow quantum wells near the n-side
Ironside, C.N., Jain, M., Roberts, J.
core +1 more source
Geologica Acta, 2019 Proboscia barboi and Proboscia curvirostris are two important diatom biostratigraphic markers from the high latitudes of the North Pacific and North Atlantic Oceans, dating back to the Pliocene-Pleistocene time.
J. Andrade +3 more
doaj +1 more source
Late Quaternary history of Lammefjorden, north-west Sjælland, Denmark
GEUS Bulletin, 2020 Lammefjorden is a reclaimed fjord in north-west Sjælland, Denmark. Sediment cores from the area were collected to study its development after the last deglaciation, in particular the sea-level history.
Ole Bennike +2 more
doaj +1 more source
THE ITALIAN QUATERNARY VOLCANISM
Alpine and Mediterranean Quaternary, 2023 The peninsular and insular Italy are punctuated by Quaternary volcanoes and their rocks constitute an important aliquot of the Italian Quaternary sedimentary successions. Also away from volcanoes themselves, volcanic ash layers are a common and frequent feature of the Quaternary records, which provide us with potential relevant stratigraphic and ...
Stefano Branca1 +35 more
openaire +5 more sources
Polarization-Engineering in III-V Nitride Heterostructures: New Opportunities For Device Design [PDF]
, 2010 The role of spontaneous and piezoelectric polarization in III-V nitride heterostructure devices is discussed. Problems as well as opportunities in incorporating polarization in abrupt and graded heterojunctions composed of binary, ternary, and quaternary
Albert +14 more
core +1 more source