8,635 research outputs found

    Ground-state energy and stability limit of small 3He drops

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    Small and stable drops of 3He atoms can only exist above a minimum number of particles, due to the combination of the 3He atom Fermi statistics and its light mass. An accurate estimation of this minimum number using microscopic theory has been difficult due to the inhomogeneous and fermionic nature of these systems. We present a diffusion Monte Carlo calculation of 3He drops with sizes near the minimum in order to determine the stability threshold. The results show that the minimum self-bound drop is formed by N=30 atoms with preferred orbitals for open shells corresponding to maximum value of the spin.Comment: 5 pages, 4 figure

    Combined measurement of the inclusive diffractive cross section at HERA

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    A combination is presented of the inclusive diffractive cross sections measured by the H1 and ZEUS Collaborations at HERA. The analysis concentrates on deep inelastic scattering data selected with the Large Rapidity Gap technique. The data span three orders of magnitude in negative four-momentum transfer squared, Q2. Correlations of systematic uncertainties are taken into account by the combination method, resulting in improved precision

    Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method

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    The determination of the longitudinal spin Seebeck effect (LSSE) coefficient is currently plagued by a large uncertainty due to the poor reproducibility of the experimental conditions used in its measurement. In this work we present a detailed analysis of two different methods used for the determination of the LSSE coefficient. We have performed LSSE experiments in different laboratories, by using different setups and employing both the temperature difference method and the heat flux method. We found that the lack of reproducibility can be mainly attributed to the thermal contact resistance between the sample and the thermal baths which generate the temperature gradient. Due to the variation of the thermal resistance, we found that the scaling of the LSSE voltage to the heat flux through the sample rather than to the temperature difference across the sample greatly reduces the uncertainty. The characteristics of a single YIG/Pt LSSE device obtained with two different setups was (1.143±0.007)⋅10−7(1.143\pm0.007)\cdot 10^{-7} Vm/W and (1.101±0.015)⋅10−7(1.101\pm0.015)\cdot 10^{-7} Vm/W with the heat flux method and (2.313±0.017)⋅10−7(2.313\pm0.017)\cdot 10^{-7} V/K and (4.956±0.005)⋅10−7(4.956\pm0.005)\cdot 10^{-7} V/K with the temperature difference method. This shows that systematic errors can be considerably reduced with the heat flux method.Comment: PDFLaTeX, 10 pages, 6 figure

    Nutrigenetic Effect of Moringa oleifera Seed Meal on the Biological Growth Programme of Young Broiler Chickens.

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    A Nutrigenetic study of the effects of graded levels (0%, 5% and 10%) of undecorticated undefatted Moringa oleifera Seed Meal (UUMOSM) on the biological growth programme of 48 young broilers of two genotypes (Marshall and Arbor Acres) was conducted. Rates of change (%) of Body Weight (WTR), Length (BLR) and Girth (BGR), and Lengths of Shank (SLR), Thigh (TLR), Wing (WLR) and Keel (KLR) between 1 and 4 weeks age were measured. The effect of Genotype and Diet on growth rate was defined by fitting a univariate General Linear Model, while the strength of relationship between traits was examined by use of Pearson's bivariate correlation method. Only BLR was significantly (P<0.05) affected by genotype, while diet significantly (P<0.05) determined WTR, BGR, TLR, WLR, and KLR. Significant (P<0.05) effects of Genotype x Diet interaction on WTR, BLR, BGR, WLR and KLR were observed. The level of correlation between trait rates varied with increasing levels of UUMOSM in both genotypes; exhibiting a direct, inverse, parabola or inverted parabola shaped relationship curve. These results showed that subtle variations in dietary levels of UUMOSM significantly influence the biological growth programme of young broilers, with implications for size and interrelationship of body parts, including shape/conformation. They further showed that substructures within populations such as clusters with non-overlapping nutritional habits (voluntary or forced) influence overall population estimates of inter-trait relationships. The transcriptomic (gene expression) and metabonomic correlates of the phenomenon reported here will be examined in further studies and should yield evidence of underlying mechanisms.Keywords: Moringa oleifera seed meal, Broiler, Growth rate, Correlationand Regression

    Equation of state description of the dark energy transition between quintessence and phantom regimes

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    The dark energy crossing of the cosmological constant boundary (the transition between the quintessence and phantom regimes) is described in terms of the implicitly defined dark energy equation of state. The generalizations of the models explicitly constructed to exhibit the crossing provide the insight into the cancellation mechanism which makes the transition possible.Comment: 3 pages, talk given at TAUP200

    Bone accumulation by leopards in the Late Pleistocene in the Moncayo Massif (Zaragoza, NE Spain)

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    Eating habits of Panthera pardus are well known. When there are caves in its territory, prey accumulates inside them. This helps to prevent its kill from being stolen by other predators like hyenas. Although the leopard is an accumulator of bones in caves, few studies have been conducted on existing lairs. There are, however, examples of fossil vertebrate sites whose main collecting agent is the leopard. During the Late Pleistocene, the leopard was a common carnivore in European faunal associations. Here we present a new locality of Quaternary mammals with a scarce human presence, the cave of Los Rincones (province of Zaragoza, Spain); we show the leopard to be the main accumulator of the bones in the cave, while there are no interactions between humans and leopards. For this purpose, a taphonomic analysis is performed on different bone-layers of the cave


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    Penelitian ini dilatarbelakangi oleh kurangnya pemahaman, penerimaan, dan sikap orang tua terhadap hambatan yang dihadapi anak. Hal ini berdampak pada kemampuan keluarga dalam memberikan layanan intervensi dini di rumah. Tujuan dari penelitian ini adalah untuk merumuskan program intervensi dini bersumber daya keluarga yang akan menjadi pedoman orang tua dalam melaksanakan intervensi. Penelitian ini menggunakan pendekatan kualitatif dengan metode deskriptif. Subjek dalam penelitian ini adalah satu keluarga yang memiliki anak Cerebral Palsy dengan hambatan komunikasi di Ciamis. Teknik pengumpulan data yang digunakan adalah observasi, wawancara, dan studi dokumentasi. Hasil penelitian menunjukkan bahwa: 1) anak memiliki hambatan komunikasi yang pencapaian perkembangan komunikasi verbalnya setara dengan anak usia 2-3 tahun dan usia kalender saat ini 5 tahun. 2) rendahnya tingkat pemahaman orangtua terhadap hambatan anak. 3). Rumusan program intervensi dini bersumber daya keluarga ini berdasarkan kondisi objektif serta kebutuhan keluarga dan anak. 4). tingkat pemahaman orang tua mengenai hambatan anak meningkat serta terjadi perubahan sikap dan perilaku orang tua kepada anak;--- The study was motivated by the lack of understanding, acceptance as well as the attitude of the parents toward their child’s obstacles. It somehow has an impact on family’s capacity to give early intervention support at home. This study was aimed at formulating an early intervention program to the child. The study used descriptive qualitative method involving a single family having a child suffering from Cerebral Palsy causing communication barrier at Ciamis. The techniques used in collecting the data were observations, interviews, and document analysis. The study revealed several findings as follows: 1) the child had communication barrier which made her communication verbal developmental stage was equal to 2-3 years old children. 2) The lack of understanding, acceptance and attitude of the parents toward their child’s communication barrier as well as the support in delivering early intervention at home. 3) The early intervention family-based program’s formulation was based on the objective condition as well as the needs’ of both the child and the parents. 4) The level understanding parents of the barriers to child increase and a change in attitudes and behavior of parents to child

    Communication: Vibrational and vibronic coherences in the two dimensional spectroscopy of coupled electron-nuclear motion

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    We theoretically investigate the photon-echo spectroscopy of coupled electron-nuclear quantum dynamics. Two situations are treated. In the first case, the Born-Oppenheimer (adiabatic) approximation holds. It is then possible to interpret the two-dimensional (2D) spectra in terms of vibrational motion taking place in different electronic states. In particular, pure vibrational coherences which are related to oscillations in the time-dependent third-order polarization can be identified. This concept fails in the second case, where strong non-adiabatic coupling leads to the breakdown of the Born-Oppenheimer-approximation. Then, the 2D-spectra reveal a complicated vibronic structure and vibrational coherences cannot be disentangled from the electronic motion

    Absolute properties of the binary system BB Pegasi

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    We present a ground based photometry of the low-temperature contact binary BB Peg. We collected all times of mid-eclipses available in literature and combined them with those obtained in this study. Analyses of the data indicate a period increase of 3.0(1) x 10^{-8} days/yr. This period increase of BB Peg can be interpreted in terms of the mass transfer 2.4 x 10^{-8} Ms yr^{-1} from the less massive to the more massive component. The physical parameters have been determined as Mc = 1.42 Ms, Mh = 0.53 Ms, Rc = 1.29 Rs, Rh = 0.83 Rs, Lc = 1.86 Ls, and Lh = 0.94 Ls through simultaneous solution of light and of the radial velocity curves. The orbital parameters of the third body, that orbits the contact system in an eccentric orbit, were obtained from the period variation analysis. The system is compared to the similar binaries in the Hertzsprung-Russell and Mass-Radius diagram.Comment: 17 pages, 3 figures, accepted for Astronomical Journa
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