3,480 research outputs found

    Tests of the D√ė calorimeter response in 2‚Äď150 GeV beams

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    At the heart of the D√ė detector, which recently started its maiden data run at the Fermilab Tevatron ppŐĄ collider, is a finely segmented hermetic large angle liquid argon calorimeter. We present here results from the latest test beam studies of the calorimeter in 1991. Modules from the central calorimeter, end calorimeter, and the inter‚Äźcryostat detector were included in this run. New results on resolution, uniformity, and linearity will be presented with electron and pion beams of various energies. Special emphasis will be placed on first results from the innovative technique of using scintillator sampling in the intermediate rapidity region to improve uniformity and hermeticity.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87713/2/1685_1.pd

    Superfluid and Fermi liquid phases of Bose-Fermi mixtures in optical lattices

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    We describe interacting mixtures of ultracold bosonic and fermionic atoms in harmonically confined optical lattices. For a suitable choice of parameters we study the emergence of superfluid and Fermi liquid (non-insulating) regions out of Bose-Mott and Fermi-band insulators, due to finite Boson and Fermion hopping. We obtain the shell structure for the system and show that angular momentum can be transferred to the non-insulating regions from Laguerre-Gaussian beams, which combined with Bragg spectroscopy can reveal all superfluid and Fermi liquid shells.Comment: 4 pages, 2 figure

    Nutritional Status and Menarcheal Age of Rural Adolescent Girls of Salboni Block of Paschim Medinipur, West Bengal, India

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    Age at menarche is a significant indicator of growth and sexual maturation in girls. During adolescence, anthropometry provides a tool for monitoring and evaluating the hormone-mediated changes in growth and reproductive maturation. Menarche is defined as the first menstrual period. It is considered to be the most obvious sign of puberty in girls. It has been regarded in many cultures as a transitional step to womanhood. This is a cross-sectional study which is done on 1009 school girls who belonged to Salboni block of district Paschim Medinipur of West Bengal, India. To study effect of nutrition on age at menarche, different anthropometric measurements were applied. The study had been done on 10-19 adolescents school girls (1009). For this study, different types of anthropometric measurements were taken like weight and height. Height is measured through anthropometric rod, and weight by a weighing machine. Triceps and biceps Skinfolds are taken by skinfold caliper. Structured questionnaires were followed to know details of socio-economic status. Height was measured to the nearest 0.1 cm and weight to the nearest 0.5 kg. Each subject was weighed with minimum clothing and no footwear. Among studied sample, 896 girls had experienced menarche. Their mean age at menarche was 11.88 years (1.23). To compare anthropometric variable premenarchel and postmenarcheal girls that mean anthropometric measurement of premenarcheal girls more higher than post menarcheal girls in studied girls minimum age at menarche is 9 years and maximum age at menarche was 17 years. Body mass index increased progressively from 13 years to 19 years of age where overall increase was 1.89 kg/m2 from 10 to 19 years which was statistically significant with age (F=17.3, P<0.001), percent body fat was statistically significant with age (F=38.7, P<0.001). Nutritional status was better in postmenarcheal girls than in premenarcheal girls. The study represents typical differential rates of positive change in different body composition measures after the attainment of menarche

    Superfluid and Mott Insulating shells of bosons in harmonically confined optical lattices

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    Weakly interacting atomic or molecular bosons in quantum degenerate regime and trapped in harmonically confined optical lattices, exhibit a wedding cake structure consisting of insulating (Mott) shells. It is shown that superfluid regions emerge between Mott shells as a result of fluctuations due to finite hopping. It is found that the order parameter equation in the superfluid regions is not of the Gross-Pitaeviskii type except near the insulator to superfluid boundaries. The excitation spectra in the Mott and superfluid regions are obtained, and it is shown that the superfluid shells posses low energy sound modes with spatially dependent sound velocity described by a local index of refraction directly related to the local superfluid density. Lastly, the Berezinskii-Kosterlitz-Thouless transition and vortex-antivortex pairs are discussed in thin (wide) superfluid shells (rings) limited by three (two) dimensional Mott regions.Comment: 11 pages, 9 figures

    Correlating Integrative Complexity With System Modularity

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    Modularity is the degree to which a system is made up of relatively independent but interacting elements. Modularization is not necessarily a means of reducing intrinsic complexity of the system, but it is a means of effectively redistributing the total complexity across the system. High degree of modularization enable reductionist strategies of system development and is an effective mechanism for complexity redistribution that can be better managed by system developers by enabling design encapsulation. In this paper, we introduce a complexity attribution framework to enable consistent complexity accounting and management procedure and show that integrative complexity has a strong inverse relationship with system modularity and its implication on complexity management for engineered system design and development.Korea (South). Ministry of Education, Science and Technology (MEST) (National Research Foundation of Korea. NRF-2016R1D1A1A09916273

    High-Throughput Computing on High-Performance Platforms: A Case Study

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    The computing systems used by LHC experiments has historically consisted of the federation of hundreds to thousands of distributed resources, ranging from small to mid-size resource. In spite of the impressive scale of the existing distributed computing solutions, the federation of small to mid-size resources will be insufficient to meet projected future demands. This paper is a case study of how the ATLAS experiment has embraced Titan---a DOE leadership facility in conjunction with traditional distributed high- throughput computing to reach sustained production scales of approximately 52M core-hours a years. The three main contributions of this paper are: (i) a critical evaluation of design and operational considerations to support the sustained, scalable and production usage of Titan; (ii) a preliminary characterization of a next generation executor for PanDA to support new workloads and advanced execution modes; and (iii) early lessons for how current and future experimental and observational systems can be integrated with production supercomputers and other platforms in a general and extensible manner

    Substrate‚ÄźControlled Divergent Synthesis of Enaminones and Pyrroles from Indolizines and Nitroso Compounds

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    It is imperative to learn new synthetic transformations to succeed in drug discovery and development. We report the substrate‚Äźdriven synthesis of ő≤‚Äźenaminones and N‚Äźaryl pyrroles from indolizines and nitrosoarenes; aryl‚Äźsubstituted indolizines lead to ő≤‚Äźenaminones in a regio‚Äź and diastereoselective manner, whereas alkyl‚Äźsubstituted indolizines produce tetrasubstituted pyrroles. All products contain a pyridine unit, the second most abundant ring (after phenyl) in the FDA Orange Book. In both cases, the reactions proceed at room temperature without any catalyst. Moreover, both types of products can be obtained in one pot from commercial materials as well as at a gram scale. It is worthy of note that the regioselectivity of the ő≤‚Äźenaminones is inaccessible by the standard literature methods and their utility has been exemplified in the synthesis of diverse heterocycles. We have made every endeavor to put forward the corresponding reaction mechanisms based on thorough experimental work.This work was generously supported by the Spanish Ministerio de Ciencia, Innovaci√≥n y Universidades (MICIU; grant no. CTQ2017-88171-P), the Generalitat Valenciana (GV; grant no. AICO/2017/007), and the Instituto de S√≠ntesis Org√°nica (ISO). M.J.G.-S. is grateful to the ISO for a predoctoral grant (contract no. I-PAS-11/16)
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