1,078 research outputs found

    Measurement of the W charge asymmetry in production with jets using 5 inverse-femtobarns of data measured at sqrt(s)=7 TeV with CMS

    Full text link
    A measurement of the electron charge asymmetry in p+→W production in association with jets at sqrt{s}=7 TeV is presented. The dataset corresponds to an integrated luminosity of L=5fb^-1 recorded by the CMS detector in proton-proton collisions at the LHC. The sample represents a large increase in statistical precision with respect to previous CMS results and describes a first study of charge asymmetry measured in p+p→W+1 jet events. Full comparisons to previous results and theoretical predictions are provided and recommendations for extending the analysis to produce valuable input for future PDF models are made

    The Significance of the Ancient Standing Stones, Villages, Tombs on Orkney Island

    Get PDF
    The Orkney Islands make up an archipelago north of Scotland. A collection of ancient stone structures believed to predate the pyramids of Egypt and the golden age of China is found in this remote corner of the globe. Archaeological evidence from these islands is consistent in several ways with the biblical account in Genesis 11:1-9 that describes an advanced civilization at Babel in Mesopotamia, the confusion of languages, and the dispersion of groups of people throughout the world. Descendants of these dispersed people very likely built the advanced Orcadian civilization that prospered over 4000 years ago

    Using digital logs to reduce academic misdemeanour by students in digital forensic assessments

    Get PDF
    Identifying academic misdemeanours and actual applied effort in student assessments involving practical work can be problematic. For instance, it can be difficult to assess the actual effort that a student applied, the sequence and method applied, and whether there was any form of collusion or collaboration. In this paper we propose a system of using digital logs generated by selected software tools (such as FTK- Forensic Toolkit and EnCase), for the purpose of identifying the effort and sequence of events that students followed to complete their learning activities, (say, arriving at conclusions relating to an assessment question) and thereby determining whether it is likely that an academic misdemeanour may have occurred. The paper elaborates on an assessment exercise conducted with a cohort of 67 students in a specific class of disciplinary learning, highlighting the process that students have to follow, and then proceeds to show in some details how selected logging facilities can be used to provide evidence that students may have committed an academic misdemeanour

    Podcast PD

    Get PDF
    Reports of police corruption are becoming more and more common in American media. In this podcast, we will discuss the distrust between the police and the community, some of the causes of the problem, and will address ways to resolve it. Throughout the duration of the podcast, we will provide the viewpoint of both sides and try to explain why they feel the way they do. To get the community’s input, our group decided to poll random students across campus to get a better understanding on their view of the police state in the US. For the police’s side, we decided to interview an officer for his input on why these controversial stories are being displayed all over the media, and asked what he thinks should be done to improve the relationship between the two parties. By including the thoughts of the opposing sides, as well as using data from some of the instances reported in the media, we hope that our listeners will gain a better understanding of the issue and proactively try to improve the relationship between the community and the police

    Setting Priorities for Space Research: Opportunities and Imperatives

    Get PDF
    This report represents the first phase of a study by a task group convened by the Space Studies Board to ascertain whether it should attempt to develop a methodology for recommending priorities among the various initiatives in space research (that is, scientific activities concerned with phenomena in space or utilizing observations from space). The report argues that such priority statements by the space research community are both necessary and desirable and would contribute to the formulation and implementation of public policy. The report advocates the establishment of priorities to enhance effective management of the nation's scientific research program in space. It argues that scientific objectives and purposes should determine how and under what circumstances scientific research should be done. The report does not take a position on the controversy between advocates of manned space exploration and those who favor the exclusive use of unmanned space vehicles. Nor does the report address questions about the value or appropriateness of Space Station Freedom or proposals to establish a permanent manned Moon base or to undertake a manned mission to Mars. These issues lie beyond the charge to the task group

    Synthesis of 2,6-trans- and 3,3,6-Trisubstituted Tetrahydropyran-4-ones from Maitland-Japp Derived 2H-Dihydropyran-4-ones: A Total Synthesis of Diospongin B

    Get PDF
    6-Substituted-2H-dihydropyran-4-one products of the Maitland-Japp reaction have been converted into tetrahydropyrans containing uncommon substitution patterns. Treatment of 6-substituted-2H-dihydropyran-4-ones with carbon nucleophiles led to the formation of tetrahydropyran rings with the 2,6-trans-stereochemical arrangement. Reaction of the same 6-substituted-2H-dihydropyran-4-ones with l-Selectride led to the formation of 3,6-disubstituted tetrahydropyran rings, while trapping of the intermediate enolate with carbon electrophiles in turn led to the formation 3,3,6-trisubstituted tetrahydropyran rings. The relative stereochemical configuration of the new substituents was controlled by the stereoelectronic preference for pseudo-axial addition of the nucleophile and trapping of the enolate from the opposite face. Application of these methods led to a synthesis of the potent anti-osteoporotic diarylheptanoid natural product diospongin B

    Polyanionic Ligand Platforms for Methyl- and Dimethylaluminum Arrays

    Get PDF
    Trimethylaluminum finds widespread applications in chemical and materials synthesis, most prominently in its partially hydrolyzed form of methylalumoxane (MAO), which is used as a cocatalyst in the polymerization of olefins. This work investigates the sequential reactions of trimethylaluminum with hexaprotic phosphazenes (RNH)6P3N3 (=XH6) equipped with substituents R of varied steric bulk including tert-butyl (1H6), cyclohexyl (2H6), isopropyl (3H6), isobutyl (4H6), ethyl (5H6), propyl (6H6), methyl (7H6), and benzyl (8H6). Similar to MAO, the resulting complexes of polyanionic phosphazenates [XHn]n−6 accommodate multinuclear arrays of [AlMe2]+ and [AlMe]2+. Reactions were monitored by 31P NMR spectroscopy, and structures were determined by single-crystal X-ray diffraction. They included 1H4(AlMe2)2, 1H3(AlMe2)3, 2H3(AlMe2)3, 3(AlMe2)4AlMe, 4H­(AlMe2)5, 4(AlMe2)6, {5H­(AlMe2)4}2AlMe, 5(AlMe2)6, 6(AlMe2)6, {7(AlMe2)4AlMe}2, and 8(AlMe2)6. The study shows that subtle variations of the steric properties of the R groups influence the reaction pathways, levels of aggregation, and fluxional behavior. While [AlMe2]+ is the primary product of the metalation, [AlMe]2+ is utilized to alleviate overcrowding or to aid aggregation. At the later stages of metalation, [AlMe2]+ groups start to scramble around congested sites. The ligands proved to be very robust and extremely flexible, offering a unique platform to study complex multinuclear metal arrangements

    Designing Second-Screening Experiences for Social Co-Selection and Critical Co-Viewing of Reality TV

    Get PDF
    Public commentary related to reality TV can be overwhelmed by thoughtless reactions and negative sentiments, which often problematically reinforce the cultural stereotyping typically employed in such media. We describe the design and month-long evaluation of a mobile "second-screening" application, Screenr, which uses co-voting and live textual tagging to encourage more critical co-viewing in these contexts. Our findings highlight how Screenr supported interrogation of the production qualities and claims of shows, promoted critical discourse around the motivations of programmes, and engaged participants in reflecting on their own assumptions and views. We situate our results within the context of existing second-screening co-viewing work, discuss implications for such technologies to support critical engagement with socio-political media, and provide design implications for future digital technologies in this domain