96 research outputs found
GRB 081203A: Swift UVOT captures the earliest ultraviolet spectrum of a gamma-ray burst
No full textWe present the earliest ultraviolet (UV) spectrum of a gamma-ray burst (GRB) as observed with the Swift Ultra-Violet/Optical Telescope (UVOT). The GRB 081203A spectrum was observed for 50 s with the UV-grism starting 251 s after the Swift-Burst-Alert-Telescope (BAT) trigger. During this time, the GRB was ≈13.4 mag (u filter) and was still rising to its peak optical brightness. In the UV-grism spectrum, we find a damped Lyα line, Lyβ and the Lyman continuum break at a redshift z= 2.05 ± 0.01. A model fit to the Lyman absorption implies a gas column density of log NH i= 22.0 ± 0.1 cm−2, which is typical of GRB host galaxies with damped Lyα absorbers. This observation of GRB 081203A demonstrates that for brighter GRBs (v≈ 14 mag) with moderate redshift (0.5 < z < 3.5) the UVOT is able to provide redshifts, and probe for damped Lyα absorbers within 4–6 min from the time of the Swift-BAT trigger
Features of formation of the Judges Corps: experience of Uzbekistan and foreign countries
No full textThis article presents a comparative legal analysis of the procedure for the election and appointment of judges in the Republic of Uzbekistan, their legal foundations, similar and distinctive aspects, as well as the specific features of the formation of the judiciary in developed foreign states, and the author has given relevant recommendations and proposals
Improving the organizational and legal framework for financing investment projects in the account of syndicated loans
No full textThis article examines the organizational and legal basis of syndicated lending in Uzbekistan for comparisons with international practice, identifies the existing problems. Formed conclusions and suggestions of the author to improve syndicated lending
Observations on the origin, treatment and cure of asiatic cholera and cholera morbus : The result of an experience of forty five years during a residence in Asia, Europe and America
No full textCollection Chagnon
Prediction of the chemical shrinkage of Portland cement
No full textChemical shrinkage is one of the main reasons leading to the early age deformation of concrete. Hence, the prediction of chemical shrinkage is an important issue for evaluating the deformation of concrete and its influence on the durability of concrete structures. There is still room to improve the accuracy for predicting the chemical shrinkage of cement, because some empirical assumptions were involved in traditional methods such as Paulini equation. In this study a discrete algorithm was proposed to deal with the stoichiometry’s conversion of tricalcium aluminate (C3A) and (tetracalcium aluminoferrite) C4AF with ongoing hydration of cement. Based on this discrete algorithm, the volume evolution of phases in cement paste and the chemical shrinkage of cement were calculated. The chemical shrinkage of cement in W/C 0.3 and W/C 0.4 were simulated using this method and compared with the results of experiments and Paulini equation. It was found that the calculated chemical shrinkage of cement in W/C 0.3 and 0.4 are in good agreement with experiments, respectively. In comparison with Paulini equation, the proposed method was more accurate for predicting the chemical shrinkage of Portland cement, because the nonlinear relationship between the chemical shrinkage and degree of hydration of cement can be simulated by dealing with the stoichiometry’s conversion of C3A and C4AF with ongoing hydration
Some aspects of interaction amplitudes of D branes carrying worldvolume fluxes
No full textWe report a systematic study of the stringy interaction between two sets of Dp branes placed parallel at a separation in the presence of two worldvolume fluxes for each set. We focus in this paper on that the two fluxes on one set have the same structure as those on the other set but they in general differ in values, which can be both electric or both magnetic or one electric and one magnetic. We compute the respective stringy interaction amplitude and find that the presence of electric fluxes gives rise to the open string pair production while that of magnetic ones to the open string tachyon mode. The interplay of these two leads to the open string pair production enhancement in certain cases when one flux is electric and the other is magnetic. In particular, we find that this enhancement occurs even when the electric flux and the magnetic one share one common field strength index which is impossible in the one-flux case studied previously by the present author and his collaborator in [17]. This type of enhancement may have realistic physical applications, say, as a means to explore the existence of extra dimensions
Sturen op waarde in Rotterdam: Afwegen en verbinden in de nieuwe realiteit van stedelijke gebiedsontwikkeling
No full textEssay tot stand gekomen in het kader van de samenwerking tussen het cluster Stadsontwikkeling van de gemeente Rotterdam en de faculteit Bouwkunde, Technische Universiteit Delft. De gevolgen van de crisis hebben in Nederland het vermogen van gemeenten om te sturen in de ontwikkeling van de stad flink aangetast. Vele gemeenten ondergaan een rigoureuze bezuinigingsoperatie - zo ook in Rotterdam. Actief grondbeleid moet in de havenstad steeds meer plaats maken voor een faciliterend stedelijk ontwikkelingsbeleid en dito manier van werken. Maar wat betekent dit nu concreet? Uit dit onderzoek blijkt dat de gemeente een lerende organisatie moet worden. Via nieuwe maar deels ook bestaande competenties, bevoegdheden en instrumenten moet zij andere actoren kunnen verleiden te investeren in projecten die zich richten op zowel de fysieke als de economische en sociale stedelijke structuren van de stad. Deze projecten, die veelal een gebiedsgerichte en intersectorale aanpak vergen, zijn het meest kansrijk om grote financiële en maatschappelijke waarde te creëren. Het vermogen om hier als gemeente een (zelf)bewuste, sturende rol in te spelen hebben wij daarom sturen op waarde genoemd.Real Estate and HousingArchitectur
Genetic variability in grapevine clones of 'Muscat of Alexandria'
No full text[EN] Among grapevine cultivars, the `Muscat¿ family includes several widespread types that share a characteristic pronounced floral aroma and a typical `Muscat¿ flavor. `Muscat blanc à petits grains¿ and `Muscat of Alexandria¿ are the most representative and ancient cultivars. The grapevine cultivar `Muscat of Alexandria¿ is of great importance within the Valencia and Vinos de Alicante PDOs (Protected Designations of Origin, a prestigious Spanish regional product classification). Fruits from these cultivars are the basis of various appreciated wines, also being consumed as table grapes or used for raisin production. We used a set of selected simple sequence repeat (SSR) markers to confirm the identity of different clones of `Muscat of Alexandria¿, some of them showing differential ampelographic traits. Additionally, we found intravarietal genetic variability using amplified fragment length polymorphism (AFLP) markers. Now, more accurate genotyping has been conducted by GBS (genotyping by sequencing). The GBS generated 2-4 million reads per sample, 85% of which were mapped to the reference genome developed by the French-Italian consortium (Vitis vinifera IGGP 12×). Around 40,000 SNPs were identified, with a coverage greater than 10×. Polymorphisms between and within the analyzed clones were found. Experimental validations of the identified SNPs will provide markers to fingerprint these clones accurately. They will be also suitable for association studies or to develop molecular markers useful in selection programs.This study was partially supported by project PRPCGL2015-70843-R co-funded with FEDER Funds.Esteras Gómez, C.; Peiró Barber, RM.; Soler, J.; Martínez-Gil, F.; Ruiz, J.; Picó Sirvent, MB.; Gisbert Domenech, MC. (2019). Genetic variability in grapevine clones of 'Muscat of Alexandria'. Acta Horticulturae. 1248:77-80. https://doi.org/10.17660/ActaHortic.2019.1248.11S7780124
Prediction of the chemical shrinkage of Portland cement
No full textChemical shrinkage is one of the main reasons leading to the early age deformation of concrete. Hence, the prediction of chemical shrinkage is an important issue for evaluating the deformation of concrete and its influence on the durability of concrete structures. There is still room to improve the accuracy for predicting the chemical shrinkage of cement, because some empirical assumptions were involved in traditional methods such as Paulini equation. In this study a discrete algorithm was proposed to deal with the stoichiometry’s conversion of tricalcium aluminate (C3A) and (tetracalcium aluminoferrite) C4AF with ongoing hydration of cement. Based on this discrete algorithm, the volume evolution of phases in cement paste and the chemical shrinkage of cement were calculated. The chemical shrinkage of cement in W/C 0.3 and W/C 0.4 were simulated using this method and compared with the results of experiments and Paulini equation. It was found that the calculated chemical shrinkage of cement in W/C 0.3 and 0.4 are in good agreement with experiments, respectively. In comparison with Paulini equation, the proposed method was more accurate for predicting the chemical shrinkage of Portland cement, because the nonlinear relationship between the chemical shrinkage and degree of hydration of cement can be simulated by dealing with the stoichiometry’s conversion of C3A and C4AF with ongoing hydration.Materials and Environmen
SNP calling using genotype model selection on high-throughput sequencing data
No full textMotivation: A review of the available single nucleotide polymorphism (SNP) calling procedures for Illumina high-throughput sequencing (HTS) platform data reveals that most rely mainly on base-calling and mapping qualities as sources of error when calling SNPs. Thus, errors not involved in base-calling or alignment, such as those in genomic sample preparation, are not accounted for.Results: A novel method of consensus and SNP calling, Genotype Model Selection (GeMS), is given which accounts for the errors that occur during the preparation of the genomic sample. Simulations and real data analyses indicate that GeMS has the best performance balance of sensitivity and positive predictive value among the tested SNP callers. © The Author 2012. Published by Oxford University Press. All rights reserved.National Science Foundation (DBI0646024 to X.C. and N.Y.); National Institutes of Health (R01GM070795 to J.Z. and S.Z.); National Natural Science Foundation of China (30870572 to X.S., X.Z., J.X. and K.N.)
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