Results 71 to 80 of about 1,876,387 (177)

Effect of iron content and potassium substitution in A$_{0.8}$Fe$_{1.6}$Se$_2$ (A = K, Rb, Tl) superconductors: a Raman-scattering investigation

, 2012
We have performed Raman-scattering measurements on high-quality single crystals of the superconductors K$_{0.8}$Fe$_{1.6}$Se$_2$ ($T_c$ = 32 K), Tl$_{0.5}$K$_{0.3}$Fe$_{1.6}$Se$_2$ ($T_c$ = 29 K), and Tl$_{0.5}$Rb$_{0.3}$Fe$_{1.6}$Se$_2$ ($T_c$ = 31 K ...
Chen, G. F., He, J. B., Liu, K., Normand, B., Wang, D. M., Xiao, J. H., Zhang, A. M., Zhang, Q. M.   +7 more
core   +1 more source

Pyramiding aphid resistance genes into the elite cowpea variety, Zaayura, using marker-assisted backcrossing

Heliyon
The cowpea aphid (Aphis cracivora) is a cosmopolitan insect pest that causes economic damage on cowpea. Although the pest persists at all the growth stages of the crop, in West Africa, aphids are the only major insect pests that farmers regularly control
Patrick Attamah, Francis Kusi, Alexander Wireko Kena, Frederick J. Awuku, Salim Lamini, Gloria Mensah, Mukhtaru Zackaria, Emmanuel Yaw Owusu, Richard Akromah   +8 more
doaj   +1 more source

Thallophilic Tl(i)–Tl(i) contacts mediated by Tl–aryl interactions. A computational study [PDF]

Dalton Transactions, 2016
Thallophilic interactions mediated by presence of coordinating anions provide 134 kJ mol−1 (M06-2X) electrostatic stabilisation.
Laura, Weston, Barnaby T, Pownall, Francis S, Mair, Joseph J W, McDouall   +3 more
openaire   +3 more sources

Pencil-Beam Single-point-fed Dirac Leaky-Wave Antenna on a Transmission-Line Grid

, 2016
Leaky-wave antennas (LWAs) are widely used as single-point-fed linear antenna arrays. The extension of LWAs to 2D implies that they can be used as single-point-fed 2D antenna arrays without requiring a complex feeding network.
Dorrah, Ayman H., Eleftheriades, George V.   +1 more
core   +1 more source

Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction

, 2005
We consider a two-level (TL) system with energy level separation Omega_0 inside a Josephson junction. The junction is shunted by a resistor R and is current I (or voltage V = RI) biased. If the TL system modulates the Josephson energy and/or is optically
A. Shnirman, G.-L. Ingold, I. Martin, K. K. Likharev, L. Bulaevskii   +4 more
core   +1 more source

Screening for bid-rigging - does it work? [PDF]

, 2016
This paper proposes a method to detect bid-rigging by applying mutually reinforcing screens to a road construction procurement data set from Switzerland in which no prior information about collusion was available.
Imhof, David, Karagök, Yavuz, Rutz, Samuel   +2 more
core  

Modelling adoption intensity of improved soybean production technologies in Ghana - a Generalized Poisson approach

Heliyon, 2020
Soybean is an important cash crop especially for farmers in the north of Ghana. However, cultivation of the commodity is dominated by smallholders equipped with traditional tools, coupled with low or no adoption of improved soybean production ...
Abass Mahama, Joseph A. Awuni, Franklin N. Mabe, Shaibu Baanni Azumah   +3 more
doaj   +1 more source

Historical analysis and visualization of the retreat of Findelengletscher, Switzerland, 1859–2010 [PDF]

, 2017
Since the end of the Little Ice Age around 1850, glaciers in Europe have strongly retreated. Thanks to early topographic surveys in Switzerland, accurate maps are available, which enable us to trace glacier changes back in time.
Huss, Matthias, Joerg, P.C., Rastner, P., Zemp, Michael   +3 more
core  

Accueil d’élèves allophones :: les enjeux socio-pédagogiques lors du passage d’une classe d’accueil à une classe ordinaire [PDF]

, 2018
Cette recherche s’inscrit dans le champ de la migration. Elle s’intéresse à l’accueil d’élèves migrants dans le cadre scolaire. Plus spécifiquement, ce travail porte un regard sur le passage que vivent les élèves allophones d’une structure d’accueil ...
Gerber, Yanick, Roulet, Régine
core  

Observation of Competing Order in a High-$T_{c}$ Superconductor with Femtosecond Optical Pulses

, 2007
We present studies of the photoexcited quasiparticle dynamics in Tl$_{2}$Ba$_{2}$Ca$_{2}$Cu$_{3}$O$_{y}$ (Tl-2223) using femtosecond optical techniques.
Averitt, R. D., Chia, Elbert E. M., Jo, In-Sun, Lee, S. -I., Oh, Kyu-Hwan, Talbayev, D., Taylor, A. J., Zhu, Jian-Xin   +7 more
core   +1 more source