8,143 research outputs found
Effect of drying and storage on the content of provitamin A of orange fleshed sweet potato (Ipomoa batatas): direct sun radiations do not have significant impact
No full text[Introduction] Sweetpotato is an important crop that is widely consumed in sub-Saharan Africa. Sun drying of sweetpotatoes is a traditional practice: after drying on rocks crushed or sliced dried sweetpotato are stored in granaries; re-hydrated and boiled to be eaten like fresh roots, or milled into flour to make porridge. Orange
fleshed sweetpotato is being promoted in Africa to tackle vitamin A deficiency. There are inconsistent reports on the effect of sun-drying on pro-vitamin A retention. High losses have been reported which may be associated with the unsaturated instable provitamin A carotenoids easily degraded by light, oxygen and heat (Rodriguez Amaya 1997). This poster describes work to understand the effects of sun/solar drying and storage on pro-vitamin A retention
Coastal Carolina Completes Sun Belt SB Sweep of Eagles Sunday
No full textCoastal Carolina Completes Sun Belt SB Sweep of Eagles Sunday Chanticleers finish off a 4-0 win in conclusion of game two, then win 12-4 in game thre
Ab initio calculations predicting the existence of an oxidized calcium dihydrogen complex to store molecular hydrogen in densities up to 100 g/L
No full textWe propose a system that can store molecular hydrogen in densities up to similar to 100 g/L. Our ab initio calculations predict the existence of an oxidized calcium dihydrogen complex, which holds up to eight H(2), i.e., Ca(ion)(H(2))(8). The dihydrogen binding to the Ca is via a weak electron-donation mechanism from the occupied H(2) sigma orbital to the unoccupied, but bound, Ca 3d orbitals. Because of the high concentration of the hydrogen in such complexes, even in calcium-intercalated pillared graphite, one can obtain reversible hydrogen storage denser than that of liquid hydrogen, 70 g/L
Effect of spin state on the dihydrogen binding strength to transition metal centers in metal-organic frameworks
No full textIn several recent experimental studies, it has been found that exposed transition metal (TM) sites in metal-organic frameworks (MOFs) yield the largest binding to H-2 by about 10 kJ/mol. However, this binding is significantly smaller than what has been observed in the so-called Kubas molecules, also with exposed metal sites. Our ab initio calculations quantitatively account for the experimental findings and further show that the splitting and occupation of the spin orbitals in the MOF systems are the reasons for their unexpected small binding energies. We predict that the binding energy to H-2 in the MOF systems can be tuned between 10 and 50 kJ/mol by using early TM elements, namely, Sc, Ti, V, Cr, and Mn
CCU Evens Sun Belt SB Series With Eagles, Claims 5-4 Comeback Win
No full textCCU Evens Sun Belt SB Series With Eagles, Claims 5-4 Comeback Wi
Monolayer Kagome Metals AVSb
No full textRecently, layered kagome metals AVSb (A = K, Rb, and Cs) have emerged
as a fertile platform for exploring frustrated geometry, correlations, and
topology. Here, using first-principles and mean-field calculations, we
demonstrate that AVSb can crystallize in a mono-layered form, revealing
a range of properties that render the system unique. Most importantly, the
two-dimensional monolayer preserves intrinsically different symmetries from the
three-dimensional layered bulk, enforced by stoichiometry. Consequently, the
van Hove singularities, logarithmic divergences of electronic density of
states, are enriched, leading to a variety of competing instabilities such as
doublets of charge density waves and s-and d-wave superconductivity. We show
that the competition between orders can be fine-tuned in the monolayer via
electron-filling of the van Hove singularities. Thus, our results suggest the
monolayer kagome metal AVSb as a promising platform for designer
quantum phases.Comment: 6 figures + Supplementary Information, published versio
Correction: Thermoelectric properties of AMg<sub>2</sub>X<sub>2</sub>, AZn<sub>2</sub>Sb<sub>2</sub> (A = Ca, Sr, Ba; X = Sb, Bi), and Ba<sub>2</sub>ZnX<sub>2</sub> (X = Sb, Bi) Zintl compounds
No full textCorrection for ‘Thermoelectric properties of AMg2X2, AZn2Sb2 (A = Ca, Sr, Ba; X = Sb, Bi), and Ba2ZnX2 (X = Sb, Bi) Zintl compounds’ by Jifeng Sun et al., J. Mater. Chem. A, 2017, 5, 8499–8509.</p
SB-3CT treatment delays rod death in S334ter retina.
No full textConfocal micrographs of whole-mounts labeled with rhodopsin in saline-treated S334ter retina (A, C and E) and SB-3CT treated S334ter retina (B, D and F) at P30, P45 and P60 in the central (1mm away from optic disc) retina. Rod number per 1mm2 in SB-3CT treated S334ter retina was significantly higher than age matched saline-treated S334ter retina at P30, P45, and P60 (G). Data are presented as mean + SEM. The symbol * indicates p<0.05. P, postnatal, Scale bar = 100 um.</p
Optical properties of highly strained GaInAs/GaAs quantum wells grown by Sb assistance
No full textOptical properties of highly strained GaInAs/GaAs quantum wells (QWs) grown by molecular beam epitaxy with Sb assistance are investigated. The samples grown by Sb incorporation and Sb pre-deposition methods display high room-temperature photoluminescence (PL) intensity at extended long wavelength. This result is explained by the surfactant effects of Sb during the growth of GaInAs/GaAs QW systems. An abnormal S-shaped temperature dependence of the PL peak position is found in the In0.42Ga0.58As/GaAs triple QWs sample grown with Sb pre-deposition. By investigating the transmission electron microscope images and time-resolved PL spectra, it is found that the S-shaped temperature dependence of the PL peak position originates from the exciton localization effect brought by the Sb-rich clusters on the QW interface
Crystal structure and atomic arrangement of delta-phase Sb-Te binary alloy
No full textThe composition modulated Sb-Te binary thin films deposited by a RF sputtering method on SiO2/Si substrates annealed through a rapid thermal annealing process and conducted a high-resolution transmission electron microscopy (HR-TEM) study in order to investigate the atomic arrangement of the delta-phase Sb-Te binary alloys which contain Te from 16 to 37 at. %. Through the comparison with HR-TEM image and diffraction patterns viewed along (2110) and (10 10) direction, we have revealed that the delta-phase Sb-Te alloy crystallized into P (3) over bar m1 or R (3) over barm space group whether the number of layers is the multiple of three or not. We also expect from analogous Bi-Te system in earlier reports that as the Sb/Te ratio increases, total number of Sb layers in a unit cell increases. Therefore, based on above result, we suggested the atomic arrangement model composed of appropriate Sb-2 and Sb2Te3 layer and obtained simulated images of < 2110 > zone axis
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