4,514 research outputs found

    Dynamical pattern formation during growth of a dual-species Bose-Einstein condensate

    Get PDF
    We simulate the growth of a dual species Bose-Einstein condensate using a Gross-Pitaevskii equation with an additional gain term giving rise to the growth. Such growth occurs during simultaneous evaporative cooling of a mixture of two gases. The ground state of a dual condensate is normally either a miscible mixture, or an immiscible phase with two spatially separated components. In a cigar trap the ground state typically consists of one component in the center, and the other component flanking it. Our simulations show that when the condensates are formed in a cigar trap and the mixture is phase separated, then the final state upon the end of the growth is generally far from the true ground state of the system. Instead it consists of multiple, interleaved bubbles of the two species. Such a pattern was observed recently in an experiment by Wieman's group at JILA, and our simulations are in good qualitative agreement with the experiment. We explain the pattern formation as due to the onset of modulation instability during growth, and study the dependence of the final state pattern on various parameters of the system

    Foreign Body Reaction to Hyaluronic Acid (Restylane®): An Adverse Outcome of Lip Augmentation

    Get PDF
    Non-animal source hyaluronic acid (Restylane®) is a relatively new redefining dermal filler that is being employed with increasing frequency in the fields of dermatology and cosmetic/facial plastic surgery. We report a case of a 74-year-old woman who presented with a firm submucosal nodule of the lower lip, which clinically was thought to represent a benign neoplasm. An excisional biopsy revealed the presence of multiple cyst-like vacuolated areas surrounded by granulomatous tissue composed predominantly of histiocytes and foamy macrophages, consistent with a foreign body reaction. Subsequent to the pathology findings, the patient acknowledged that she had received injections of Restylane® to the lips approximately 6 months before discovering the nodule. She had not mentioned this to her dentist or oral and maxillofacial surgeon to whom she had been referred because she believed that these two events were not related. Although hyaluronic acid-based dermal fillers reportedly have a low incidence of long term side effects, clinicians should be aware of the possible development of foreign body reactions to these injectable agents

    Cryogenic Tunnel Pressure Measurements on a Supercritical Airfoil for Several Shock Buffet Conditions

    Get PDF
    Steady and unsteady experimental data are presented for several fixed geometry conditions from a test in the NASA Langley 0.3-Meter Transonic Cryogenic Tunnel. The purpose of this test was to obtain unsteady data for transonic conditions on a fixed and pitching supercritical airfoil at high Reynolds numbers. Data and brief analyses for several of the fixed geometry test conditions will be presented here. These are at Reynolds numbers from 6 x 10(exp 6) to 35 x 10(exp 6) bases on chord length, and span a limited range of Mach numbers and angles of attack just below and at the onset of shock buffet. Reynolds scaling effects appear in both the steady pressure data and in the onset of shock buffet at Reynolds numbers of 15 x 10(exp 6) and 3O x 10(exp 6) per chord length

    Why Exempting Negligent Doctors May Reduce Suicide: An Empirical Analysis

    Get PDF
    This Article is the first to empirically analyze the impact of tort liability on suicide. Counter-intuitively, our analysis shows that suicide rates increase when potential tort liability is expanded to include psychiatrists—the very defendants who would seem best able to prevent suicide. Using a fifty-state panel regression for 1981 to 2013, we find that states which allowed psychiatrists (but not other doctors) to be liable for malpractice resulting in suicide experienced a 9.3% increase in suicides. On the other hand, and more intuitively, holding non-psychiatrist doctors liable de-creases suicide by 10.7%. These countervailing effects can be explained by psychiatrists facing liability choosing not to work with patients at high risk for suicide, whereas other doctors do not have that ability and instead avoid liability by providing better care. The Article makes important contributions to the law of proximate cause and to the more general phenomenon of regulatory avoidance. Traditionally, one could not be liable for malpractice that caused another’s suicide—the suicide was considered a superseding and intervening cause. About half of states retain the old common law rule. Others have created exceptions for psychiatrists only or for all doctors, and some have abandoned the old rule entirely. Our findings suggest that expanding liability for psychiatrists may have an adverse effect. Accordingly, this Article suggests that the best policy might be to retain or revive the traditional no-liability-for-suicide rule for mental health specialists. The implications are enormous: over 40,000 people in the United States die each year from suicide

    Interfaith Inquiry: Learning From Community-Based Research, Pluralism, and Student-Faculty Collaboration

    Get PDF
    Abstract On Catholic college campuses, community outreach and inter-faith cooperation occurs most often under the direction of Student Life Offices, often with strong leadership provided by Campus Ministry. Within this more traditional approach, students learn a great deal about the value of both enterprises, though their learning remains largely undocumented, unassessed and, without the benefit of earned credit hours, unrewarded. A team of faculty and students at Loras College in Dubuque, Iowa are in the process of a following a different approach. After five years of coordinating interfaith conversations and scripture study with centers of worship throughout the Dubuque area, including Christian churches, Jewish Temple, and the local mosque, faculty and student interns created a survey designed to gauge attitudes toward religion throughout the city. By working not only with places of worship but also with local government and businesses, faculty and students are collecting responses that can provide data on each site as well as information on more general, community-wide trends. At this early stage in the process, the group has completed surveys of five institutions, and although that number is too small to reveal conclusive evidence about religious attitudes in this Midwestern town of 60,000, it has been sufficient to disclose the type of learning students are experiencing throughout the project
    corecore