3,211 research outputs found

    Feminist Collaboration in the Art Academy

    Get PDF
    Women\u27s activity in the visual arts both in and outside of the art institutions of Europe and the United States reveals a history of collaboration in artistic production and political activism This paper analyzes the effects of feminist collaboration upon the disciplines of art, the pedagogy of art, and the administration of art institutions. In Part I, the authors review the impact of feminist collaboration in art history, aesthetics, art criticism, and art production. Part II provides examples of collaborative experiences of women in higher education art institutions and in some art communities in the United States, Scandinavia, and Italy. Three conclusions emerged from the review: (a) Collaboration facilitated women\u27s entry into the visual arts; (b) collaborative dialogue has changed the academic structures of art criticism and art history, but collaboration has had a minimal effect in the areas of aesthetics and art production; and (c) collaboration has not resulted in a significant change in the administration or pedagogy of art institutions

    Control System Design Philosophy for Effective Operations and Maintenance

    Full text link
    A well-designed control system facilitates the functions of machine operation, maintenance and development. In addition, the overall effectiveness of the control system can be greatly enhanced by providing reliable mechanisms for coordination and communication, ensuring that these functions work in concert. For good operability, the information presented to operators should be consistent, easy to understand and customizable. A maintainable system is segmented appropriately, allowing a broken element to be quickly identified and repaired while leaving the balance of the system available. In a research and development environment, the control system must meet the frequently changing requirements of a variety of customers. This means the system must be flexible enough to allow for ongoing modifications with minimal disruptions to operations. Beyond the hardware and software elements of the control system, appropriate workflow processes must be in place to maximize system uptime and allow people to work efficiently. Processes that provide automatic electronic communication ensure that information is not lost and reaches its destination in a timely fashion. This paper discusses how these control system design and quality issues have been applied at the Thomas Jefferson National Accelerator Facility.Comment: ICALEPCS 200

    Stock Options: The Backdating Issue

    Get PDF
    [Excerpt] Employee stock options are contracts giving employees the right to buy the company’s common stock at a specified exercise price, at a specified time or during a specified period, and after a specified vesting period. The value of the option when granted lies in the prospect that the market price of the company’s stock will increase by the time the option is exercised (used to purchase stock). At the grant date for the options, rather than selecting an exercise price based on the current market price for the stock, officials at some companies have selected a prior date with a lower market price; that is, they backdated stock options to an earlier grant date. If this backdating occurred without public disclosure, the recipient of the stock options received increased compensation in violation of Securities and Exchange Commission (SEC) regulations, generally accepted accounting rules, and tax laws. Some backdating is said to involve “sloppiness,” not fraud. The backdating of stock options has imposed costs on shareholders, employees, bondholders, and taxpayers. A corporate official who has profited from undisclosed backdating of stock options may not be responsible or even knowledgeable of the backdating. “Nonqualified” stock options, which have no special tax criteria to meet, are the focus of the backdating controversy primarily because they can be granted in unlimited amounts. The magnitude of stock option grants grew dramatically in the 1990s, subsequent to passage of the Omnibus Budget Reconciliation Act of 1993, a stock market boom, and revised accounting rules. Recent corporate disclosure changes have reduced the opportunities and rewards for backdating stock options. Empirical studies about backdating have been done by academics and investigative journalists. Four recent regulatory actions may have reduced the backdating of stock options, but problems persist. On December 16, 2004, the Financial Accounting Standards Board issued new rules requiring companies to subtract the expense of options from their earnings. After August 29, 2002, the Sarbanes-Oxley Act required that companies notify the SEC within two business days after granting stock options. In 2003, the SEC required increased disclosure of stock option plans. The SEC issued enhanced option grant disclosure rules effective December 15, 2006. Policy options to further reduce backdating and other timing manipulation include changes in SEC regulations and a change in the tax law. The SEC, various state prosecutorial, and Department of Justice (DOJ) probes into backdating abuses are ongoing. In addition, many firms have mounted their own internal probes into possible abuses. By November 2007, the SEC’s investigation caseload had fallen from a peak of 160 to about 80, and the SEC had brought civil enforcement actions against seven companies and 26 former executives associated with 15 firms. And according to reports from the DOJ, there were at least 10 criminal filings against defendants for backdating. As of January 2, 2008, the only CEO to be convicted of charges related to backdating was Greg Reyes, former Brocade CEO. This report will be updated as issues develop or new legislation is introduced

    Using A Nameserver to Enhance Control System Efficiency

    Full text link
    The Thomas Jefferson National Accelerator Facility (Jefferson Lab) control system uses a nameserver to reduce system response time and to minimize the impact of client name resolution on front-end computers. The control system is based on the Experimental Physics and Industrial Control System (EPICS), which uses name-based broadcasts to initiate data communication. By default, when EPICS process variables (PV) are requested by client applications, all front-end computers receive the broadcasts and perform name resolution processing against local channel name lists. The nameserver is used to offload the name resolution task to a single node. This processing, formerly done on all front-end computers, is now done only by the nameserver. In a control system with heavily loaded front-end computers and high peak client connection loads, a significant performance improvement is seen. This paper describes the name server in more detail, and discusses the strengths and weaknesses of making name resolution a centralized service.Comment: ICALEPCS 200

    A comparative study of simulated and experimental results for an extruding elastomeric component

    Get PDF
    With ever advancing simulation techniques and algorithms being introduced to commercial software, the importance of validation remains a priority. An experimental rig was designed to study the effects of rubber extrusion consisting of a compression testing system and a transparent extrusion barrel, of similar geometry to that used in a forming process. Through visual and numerical comparison, the experimental results would be compared to those obtained through Finite Element Analysis (FEA). To remedy the convergence difficulties of the complexity of the simulation, due to large deformations, a recent Nonlinear Adaptive Remeshing boundary condition was applied to the model

    Design optimisation of swellable elastomeric seals using advanced material modelling and FEM simulations

    Get PDF
    Swellable elastomeric seal is a type of specifically engineered packer that swell upon contact with wellbore fluids. Such packers have been widely employed in various oil-&-gas and minerals applications including slimming of well design, zonal isolation, water shut-off, and multi-stage fracturing. Downhole conditions are difficult to be reproduced using physical testing environment, but feasible to be simulated in virtual environment using CAE software. A better understanding of packers’ mechanical behaviour in downhole conditions would provide a higher confidence and improvement of existing engineering design practices for manufacturing of packers. The numerical simulation can be incorporated into optimisation procedure searching for an optimal shape of packers with the goals to minimise the time to seal the borehole and maximise the contact pressure between the seal and borehole. Such an optimisation would facilitate the development of a packer with various designs optimised for different downhole conditions. The objective of this research project is to develop a design tool integrated into a CAE to implement parametric numerical studies using FEM simulation. However, development of such a CAE plugin is associated with a number of technical challenges specific to this class of multiphysics problems, which will be addressed and discussed in a poster

    Quarkonium Production in PHENIX

    Get PDF
    Quarkonia provide a sensitive probe of the properties of the hot dense medium created in high energy heavy ion collisions. Hard scattering processes result in the production of heavy quark pairs that interact with the collision medium during hadronization. These in medium interactions convey information about the fundamental properties of the medium itself and can be used to examine the modification of the QCD confining potential in the collision environment. Baseline measurements from the d+Au and p+p collision systems can be used to distinguish cold nuclear matter effects while measurements from heavy ion collision systems, Au+Au and Cu+Cu, can be used to quantify in-medium effects. PHENIX results for the production of the J/ψJ/\psi for a diverse set of collision systems and energies and for the Υ\Upsilon in p+p collisions are presented.Comment: 9 pages, 7 figures, Proceedings for Hard Probes 200

    Heavy Quarkonia Production in p+p Collisions from the PHENIX Experiment

    Get PDF
    Quarkonia provide a sensitive probe of the properties of the hot dense medium created in high energy heavy ion collisions. Hard scattering processes result in the production of heavy quark pairs that interact with the collision medium during hadronization. These in-medium interactions convey information about the fundamental properties of the medium itself and can be used to examine the modification of the QCD confining potential in the collision environment. Baseline measurements from p+p and d+Au collision systems are used to distinguish cold nuclear matter effects while measurements from heavy ion collision systems are used to quantify in-medium effects. The PHENIX experiment has the capability of detecting heavy quarkonia at 1.2<η<2.21.2<|\eta|<2.2 via the μ+μ\mu^+\mu^- decay channel and at η<0.35|\eta|<0.35 via the e+ee^+e^- decay channel. Recent runs have resulted in the collection of high statistics p+p data sets that provide an essential baseline reference for heavy ion measurements and allow for further critical evaluation of heavy quarkonia production mechanisms. The latest PHENIX results for the production of the J/ψJ/\psi in p+p collisions are presented and future prospects for ψ\psi', χc\chi_{c} and Υ\Upsilon measurements are discussed.Comment: 4 pages, 2 figures, Proceedings for Quark Matter 200
    corecore