1,561 research outputs found
InAs-AlSb quantum wells in tilted magnetic fields
InAs-AlSb quantum wells are investigated by transport experiments in magnetic
fields tilted with respect to the sample normal. Using the coincidence method
we find for magnetic fields up to 28 T that the spin splitting can be as large
as 5 times the Landau splitting. We find a value of the g-factor of about 13.
For small even-integer filling factors the corresponding minima in the
Shubnikov-de Haas oscillations cannot be tuned into maxima for arbitrary tilt
angles. This indicates the anti-crossing of neighboring Landau and spin levels.
Furthermore we find for particular tilt angles a crossover from even-integer
dominated Shubnikov-de Haas minima to odd-integer minima as a function of
magnetic field
Influence of various training systems on yield and quality of Muscat Hamburg grapes
Effect of different training systems on the performance of Muscat Hamburg was studied as regards yield and quality for six years. Although the space allotted and fertilizer applied per vine were the same, the vines trained on bower system gave yields five times as high (9.0 kg/vine) as those trained on head system (1.8 kg/vine). Unilateral Kniffin, unilateral telephone, bilateral telephone and bilateral Kniffin gave yields of 5.4, 5.6, 5.8 and 6.7 kg/vine, respectively. There was no measurable effect on quality of fruit.Der Einfluß verschiedener Erziehungssysteme auf Ertrag und Qualität der RebsorteMuskat HamburgIn einem sechsjährigen Versuch wurde der Einfluß verschiedener Erziehungssysteme auf die Ertrags- und Qualitätsleistung von Muskat Hamburg verfolgt. Obwohl die Fläche und die Düngergabe je Rebe durchweg gleich waren, erbrachten die Reben bei Pergolaerziehung im Durchschnitt den fünffachen Ertrag wie bei Kopferziehung (9,0 kg/Rebe gegenüber 1,8 kg). Bei einseitiger Kniffin-, einseitiger „Telephon"-, zweiseitiger „Telephon"- bzw. zweiseitiger Kniffin-Erziehung wurden Durchschnittserträge von 5,4, 5,6, 5,8 bzw. 6,7 kg/Rebe erzielt. Ein meßbarer Einfluß der Erziehungsform auf die Beerenqualität lag nicht vor
Effect of plant density on vine growth, yield, fruit quality and nutrient status in Perlette grapevines
Studies on the effect of plant density on vine growth, nutrient status, yield and quality of the grape cv. Perlette were carried out during 1980, 1981 and 1982. Vine growth measured in terms of shoot length, trunk girth and pruning weight as weil as the level of the nutrient elements N, P, K, Fe, Mn, Zn and carbohydrates were highest at the maximum spacing i. e. 3.0 x 3.0 m and decreased with an increase in the plant density. Most of the nutrients were high either in early spring or during the rainy season. The average yields per vine and per ha were highest at 3.0 x 3.0 m and 2.0 x 2.0 m spacing, respectively. No significant differences were observed in the various quality parameters of the fruit under various plant densities. Under the prevailing agro-climatic conditions optimum yield per ha of Perlette grapes trained on head system can be obtained by planting the vines at 2.0 x 2.0 m spacing
Electronic modulation of infrared emissivity in graphene plasmonic resonators
Electronic control of blackbody emission from graphene plasmonic resonators
on a silicon nitride substrate is demonstrated at temperatures up to 250 C. It
is shown that the graphene resonators produce antenna-coupled blackbody
radiation, manifest as narrow spectral emission peaks in the mid-IR. By
continuously varying the nanoresonators carrier density, the frequency and
intensity of these spectral features can be modulated via an electrostatic
gate. We describe these phenomena as plasmonically enhanced radiative emission
originating both from loss channels associated with plasmon decay in the
graphene sheet and from vibrational modes in the SiNx.Comment: 17 pages, 6 figure
lntrogression of Bacterial Leaf Blight Resistance Gene from Oryza Minuta J.B. Presl. Ex C. B. Presl. into New Rice Type (Oryza sativa L.)
F1 Hybrids, backcross progenies, advanced introgression lines (2n=24) and monosomic alien addition lines or MAALs (2n=25) were successfully produced following embryo rescue between an elite new plant type (NPT) breeding line of Oryza sativa (2n=24, AA) and a wild species, O. minuta (2n=48, BBCC). F1 hybrids performance were intermediate between the parents. The F1 hybrids had 36 chromosomes indicating having 12 chromosome A from O. sativa and 12 B and 12 C from O. minuta. THE BACK CROSS progenies had different chromosome number indicating abnormal meiosis of the hybrids and back cross progenies. Plant with 2n=24 and 25 chromosomes were obtained in BC4FI. The hybrids and backcross progenies were susceptible to bacterial leaf blight (BB). However, several of the 2n=24 plants derived resistant plant to bacterial leaf blight race 1 of the Philippines races. The gene is different from introgressed gene intio rice from O. longistaminata ( Xa21) and from O. Minuta Acc. 101141 I Key words: Oryza minuta, MAALS, Bacterial leaf bligh
Experimental Demonstration of >230{\deg} Phase Modulation in Gate-Tunable Graphene-Gold Reconfigurable Mid-Infrared Metasurfaces
Metasurfaces offer significant potential to control far-field light
propagation through the engineering of amplitude, polarization, and phase at an
interface. We report here phase modulation of an electronically reconfigurable
metasurface and demonstrate its utility for mid-infrared beam steering. Using a
gate-tunable graphene-gold resonator geometry, we demonstrate highly tunable
reflected phase at multiple wavelengths and show up to 237{\deg} phase
modulation range at an operating wavelength of 8.50 {\mu}m. We observe a smooth
monotonic modulation of phase with applied voltage from 0{\deg} to 206{\deg} at
a wavelength of 8.70 {\mu}m. Based on these experimental data, we demonstrate
with antenna array calculations an average beam steering efficiency of 50% for
reflected light for angles up to 30{\deg}, relative to an ideal metasurface,
confirming the suitability of this geometry for reconfigurable mid-infrared
beam steering devices
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