Long Island University

About: Long Island University is a education organization based out in Brookville, New York, United States. It is known for research contribution in the topics: Population & Context (language use). The organization has 2647 authors who have published 4924 publications receiving 108757 citations.

Perturbed disks get shocked. Binary black hole merger effects on accretion disks

Abstract: The merger process of a binary black hole system can have a strong impact on a circumbinary disk. In the present work we study the effect of both central mass reduction (due to the energy loss through gravitational waves) and a possible black hole recoil (due to asymmetric emission of gravitational radiation). For the mass reduction case and recoil directed along the disk's angular momentum, oscillations are induced in the disk which then modulate the internal energy and bremsstrahlung luminosities. On the other hand, when the recoil direction has a component orthogonal to the disk's angular momentum, the disk's dynamics are strongly impacted, giving rise to relativistic shocks. The shock heating leaves its signature in our proxies for radiation, the total internal energy and bremsstrahlung luminosity. Interestingly, for cases where the kick velocity is below the smallest orbital velocity in the disk (a likely scenario in real active galactic nuclei), we observe a common, characteristic pattern in the internal energy of the disk. Variations in kick velocity simply provide a phase offset in the characteristic pattern implying that observations of such a signature could yield a measure of the kick velocity through electromagnetic signals alone.

Gonadal effects of vasectomy and vasoligation.

Abstract: During a 28-week study, vasectomy and vasoligation of immature male Wistar rats revealed that there was a significant decrease in urinary 17-ketosteroid in the vasectomized group at week 15; at week 28 there were significant decreases in the weights of the testes of the test groups, as compared to those receiving sham operations, with maximum alterations in the vasectomized rats. Small, soft discolored testes with cysts in the cauda epididymis and vas deferens regions occurred frequently in the test groups. The output of 17-ketosteroid in the urine and the findings in the testes indicate significant alterations in the morphology and function of the testes and suggest the need for caution and extensive investigations in man before recommending vasectomy as a simple, innocuous, "physiologic" means to ensure conception control.

A socio‐technical framework for quality assessment of computer information systems

Abstract: The emergence of total quality management and the ISO 9000 suite of standards has allowed a re‐think of how (and why) the post‐implementation evaluation of computer systems is to be carried out Traditional performance measurement, modeling and analysis techniques – while not discredited – have been tempered with a more holistic ideology This article recommends a socio‐technical approach to determining the quality of a computer information system In this context, two postulates have been proposed and tested by field survey of expert systems in the insurance industry in North America Postulate one focuses on a multidimensional concept of IS quality comprising the characteristics of task, technology, people and organization Postulate two deals with differences in assessments of these characteristics according to stakeholder groups: managers, developers, and users Summarizes the key findings of these postulates in the context of the TQM and ISO 9000 philosophies

Pharmacokinetics of Antimony in Children Treated for Leishmaniasis with Meglumine Antimoniate

Abstract: Background. In some settings, the response to pentavalent antimonial therapy for leishmaniasis may be lower in children than in adults. We hypothesized that there are age-dependent pharmacokinetic differences of potential clinical relevance. Methods. We compared the pharmacokinetics of antimony (Sb) in adults and 2 groups of children 3–6 years old who had cutaneous leishmaniasis treated with intramuscular meglumine antimoniate. Adults ( ) and the n p 9 first group of children ( ) received 20 mg Sb/kg/day for 20 days; the second group of children ( ) n p 9