4,703 research outputs found

    Investigation of wrought steel railway car wheels : part I, tests of strength properties of wrought steel car wheels

    Get PDF
    Cover title.Prepared as part of an investigation conducted by the Engineering Experiment Station, University of Illinois at Urbana-Champaign

    A radiation-hard dual-channel 12-bit 40 MS/s ADC prototype for the ATLAS liquid argon calorimeter readout electronics upgrade at the CERN LHC

    Full text link
    The readout electronics upgrade for the ATLAS Liquid Argon Calorimeters at the CERN Large Hadron Collider requires a radiation-hard ADC. The design of a radiation-hard dual-channel 12-bit 40 MS/s pipeline ADC for this use is presented. The design consists of two pipeline A/D channels each with four Multiplying Digital-to-Analog Converters followed by 8-bit Successive-Approximation-Register analog-to-digital converters. The custom design, fabricated in a commercial 130 nm CMOS process, shows a performance of 67.9 dB SNDR at 10 MHz for a single channel at 40 MS/s, with a latency of 87.5 ns (to first bit read out), while its total power consumption is 50 mW/channel. The chip uses two power supply voltages: 1.2 and 2.5 V. The sensitivity to single event effects during irradiation is measured and determined to meet the system requirements

    Justifying Public Decisions in Arctic Oil and Gas Development: American and Russian Approaches

    Get PDF
    Government resource decisions in the Arctic typically involve complex issues; multiple criteria are used to choose among alternatives. This complexity is even greater with petroleum development because of concerns about national energy security, environmental impacts, and economic development. Two decision-aiding techniques may help decision makers clarify their decisions to themselves, the stakeholders, and the general public. The Russian qualitative technique seeks to reduce the number of criteria and find alternative options that may be better than the initial ones. The Western quantitative technique seeks to measure the decision maker's judgement about the utility and certainty of each option. These techniques are applied to two case studies: a decision about gas pipeline routing on the Yamal Peninsula, Russia, and a tool for evaluating applications for development permits on the North Slope of Alaska. The qualitative method is easier to use and may be the best model for people who use numbers infrequently or want to make a claim based on rights. The quantitative method did well at preserving detail and incorporating uncertainty. Both approaches helped to reduce the apparent complexity of the decisions.Les décisions gouvernementales concernant les ressources dans l'Arctique mettent le plus souvent en jeu des questions complexes; un grand nombre de critères sont utilisés en vue de choisir parmi différentes options. Cette complexité s'accroît dans le cas de l'exploitation pétrolière en raison des problèmes entourant la sécurité nationale de l'énergie, les retombées environnementales et le développement économique. Deux techniques d'aide à la décision peuvent inciter les décideurs à clarifier leurs décisions pour eux-mêmes, pour les parties intéressées et pour le grand public. La technique qualitative russe cherche à réduire le nombre de critères et à trouver des solutions de rechange qui pourraient être meilleures que les mesures initiales. La technique quantitative occidentale cherche à mesurer le jugement du décideur sur l'utilité et la certitude de chaque option. Ces techniques sont appliquées à deux études de cas: une décision concernant le tracé d'un gazoduc dans la presqu'île de Iamal en Russie, et un outil permettant d'évaluer les demandes de permis d'exploitation sur le versant Nord de l'Alaska. La méthode qualitative est plus facile à utiliser et peut être le meilleur modèle pour des individus qui n'ont pas l'habitude des chiffres ou qui veulent établir une revendication fondée sur des droits. La méthode quantitative réussit bien à préserver le détail et à intégrer l'incertitude. Les deux approches aidaient à réduire la complexité apparente des décisions

    Justifying Public Decisions in Arctic Oil and Gas Development: American and Russian Approaches

    Get PDF
    Government resource decisions in the Arctic typically involve complex issues; multiple criteria are used to choose among alternatives. This complexity is even greater with petroleum development because of concerns about national energy security, environmental impacts, and economic development. Two decision-aiding techniques may help decision makers clarify their decisions to themselves, the stakeholders, and the general public. The Russian qualitative technique seeks to reduce the number of criteria and find alternative options that may be better than the initial ones. The Western quantitative technique seeks to measure the decision maker* s judgement about the utility and certainty of each option. These techniques are applied to two case studies: a decision about gas pipeline routing on the Yamal Peninsula, Russia, and a tool for evaluating applications for development permits on the North Slope of Alaska. The qualitative method is easier to use and may be the best model for people who use numbers infrequently or want to make a claim based on rights. The quantitative method did well at preserving detail and incorporating uncertainty. Both approaches helped to reduce the apparent complexity of the decisions

    Justifying Public Decisions in Arctic Oil and Gas Development: American and Russian Approaches

    Get PDF
    Government resource decisions in the Arctic typically involve complex issues; multiple criteria are used to choose among alternatives. This complexity is even greater with petroleum development because of concerns about national energy security, environmental impacts, and economic development. Two decision-aiding techniques may help decision makers clarify their decisions to themselves, the stakeholders, and the general public. The Russian qualitative technique seeks to reduce the number of criteria and find alternative options that may be better than the initial ones. The Western quantitative technique seeks to measure the decision maker* s judgement about the utility and certainty of each option. These techniques are applied to two case studies: a decision about gas pipeline routing on the Yamal Peninsula, Russia, and a tool for evaluating applications for development permits on the North Slope of Alaska. The qualitative method is easier to use and may be the best model for people who use numbers infrequently or want to make a claim based on rights. The quantitative method did well at preserving detail and incorporating uncertainty. Both approaches helped to reduce the apparent complexity of the decisions

    Clinic outcomes of the Pathway to Care Model: A cross-sectional survey of adolescent depression in Malawi

    Get PDF
    Background: Depression is one of the leading contributors to the global burden of disease and often has an onset during adolescence. While effective treatments are available, many low-income countries, such as Malawi, lack appropriately trained health providers in community health settings, and this limits access to effective mental healthcare for young people with depression. To address this need, a Canadian-developed youth depression Pathway to Care Model, linking school-based mental health literacy interventions to training of community healthcare providers, was adapted for use in Malawi and successfully applied.Methods: A sample of healthcare providers (N = 25) from community health clinics (N = 9) were trained in the use of comprehensive, systematic clinical interventions, addressing the identification, diagnosis, and treatment of depression in youth who had been referred from schools where mental health literacy interventions had been implemented. Referral outcomes were obtained using a standardised clinical record form.Results: Over 120 clinical outcome forms were available for analysis. Seventy percent of youth referred by their teachers were diagnosed with depression. Most youth diagnosed with depression identified physical symptoms as their primary difficulty. Available standardised outcome measures applied by clinicians indicated that, overall, youth showed positive outcomes as a result of treatment.Conclusions: Community healthcare providers in Malawi were trained in the identification, diagnosis, and treatment of youth depression. When this training was applied in usual clinical care to youth referred from schools, it led to generally favourable clinical outcomes. To our knowledge, this is the first demonstration of a clinically feasible intervention that results in positive outcomes for young people with depression in Malawi, and it may provide a useful model to replicate elsewhere in sub-Saharan Africa

    The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1

    Get PDF
    A key goal of the Stage IV dark energy experiments Euclid, LSST and WFIRST is to measure the growth of structure with cosmic time from weak lensing analysis over large regions of the sky. Weak lensing cosmology will be challenging: in addition to highly accurate galaxy shape measurements, statistically robust and accurate photometric redshift (photo-z) estimates for billions of faint galaxies will be needed in order to reconstruct the three-dimensional matter distribution. Here we present an overview of and initial results from the Complete Calibration of the Color-Redshift Relation (C3R2) survey, designed specifically to calibrate the empirical galaxy color-redshift relation to the Euclid depth. These redshifts will also be important for the calibrations of LSST and WFIRST. The C3R2 survey is obtaining multiplexed observations with Keck (DEIMOS, LRIS, and MOSFIRE), the Gran Telescopio Canarias (GTC; OSIRIS), and the Very Large Telescope (VLT; FORS2 and KMOS) of a targeted sample of galaxies most important for the redshift calibration. We focus spectroscopic efforts on under-sampled regions of galaxy color space identified in previous work in order to minimize the number of spectroscopic redshifts needed to map the color-redshift relation to the required accuracy. Here we present the C3R2 survey strategy and initial results, including the 1283 high confidence redshifts obtained in the 2016A semester and released as Data Release 1.Comment: Accepted to ApJ. 11 pages, 5 figures. Redshifts can be found at http://c3r2.ipac.caltech.edu/c3r2_DR1_mrt.tx
    corecore