1,209 research outputs found

    Classifying Control Variables

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    Interviews with 68 managers from 20 Fortune 500 firms were used to discern control variables that managers use to control production and evaluate management performance. It was concluded that financial accounting variables tend to be the most used and as a corollary, the control variables do not serve very well in evaluating progress toward long- term goals. Discussion suggests that accounting variables are most appealing because of their appearance of validity and legitimacy

    Modeling earnings behavior

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    The differences between the economic rate of return measure and the accounting rate of return measure are explored. The economic rate is based on expectation where the accounting rate is based on actual events. The accounting system filters return data by averaging and other processes to create a slow rate of reversion

    Autonomous greenhouse gas measurement system for analysis of gas migration on landfill sites

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    This paper describes the design, development and validation of an autonomous gas sensing platform prototype for monitoring of the greenhouse gases, methane (CH4) and carbon dioxide (CO2). The deployment undertaken for validation of the developed prototype monitored landfill gas migration to perimeter borehole wells on a landfill site. Target gas concentrations were captured via infrared gas sensors tuned for each target gas and data reported to an offsite data collection point at 12 hour intervals. This bespoke platform and the accompanying data recording and interface software provide a flexible alternative to the presently employed labor intensive, manual monitoring routines. This successful trial brought about a change in the management of the trial sites gas extraction system

    Intra-Pelvic Migration of Sliding Hip Screw During Osteosynthesis of Hip Fracture: A Rare Avoidable Intraoperative Complication.

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    Hip fractures, which are common among old patients, are classified into two groups: intracapsular and extracapsular fractures. Extracapsular fractures can be treated with extramedullary implants [e.g. dynamic hip screw (DHS)] or intramedullary nails. Dynamic hip screw is the treatment of choice in stable pertrochanteric fractures. Intrapelvic migration of the sliding screw is a very rare complication

    Pseudospectral discretization of nonlinear delay equations: new prospects for numerical bifurcation analysis

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    We apply the pseudospectral discretization approach to nonlinear delay models described by delay differential equations, renewal equations or systems of coupled renewal equations and delay differential equations. The aim is to derive ordinary differential equations and to investigate the stability and bifurcation of equilibria of the original model by available software packages for continuation and bifurcation for ordinary differential equations. Theoretical and numerical results confirm the effectiveness and the versatility of the approach, opening a new perspective for the bifurcation analysis of delay equations, in particular coupled renewal and delay differential equations

    Cytomegalovirus Retinitis in an Immunocompromised Infant: A Case Report and Review of the Literature

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    Purpose: To describe a case of bilateral cytomegalovirus retinitis (CMVR) in an immunocompromised infant. Methods: A 4-month-old male infant with severe combined immunodeficiency syndrome was examined for the presence of CMVR. Ocular involvement was recorded and monitored by digital imaging. Results: The child had bilateral CMVR, with a fine granular pattern, present both in the peripheral retina and posterior pole. There was no vitritis. The active areas of retinitis progressively resolved with intravenous ganciclovir treatment. At the 3-month follow-up examination, no recurrence was observed. Conclusion: Ganciclovir treatment was effective in this case. The prognosis depends on rapid institution of effective antiviral therapy and on a patient’s systemic immunocompetence

    Esculetin provides neuroprotection against mutant huntingtin-induced toxicity in huntington’s disease models

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    Huntington’s disease (HD) is a neurodegenerative disorder caused by an abnormal CAG trinucleotide repeat expansion within exon 1 of the huntingtin (HTT) gene. This mutation leads to the production of mutant HTT (mHTT) protein which triggers neuronal death through several mechanisms. Here, we investigated the neuroprotective effects of esculetin (ESC), a bioactive phenolic compound, in an inducible PC12 model and a transgenic Drosophila melanogaster model of HD, both of which express mHTT fragments. ESC partially inhibited the progression of mHTT aggregation and reduced neuronal death through its ability to counteract the oxidative stress and mitochondria impairment elicited by mHTT in the PC12 model. The ability of ESC to counteract neuronal death was also confirmed in the transgenic Drosophila model. Although ESC did not modify the lifespan of the transgenic Drosophila, it still seemed to have a positive impact on the HD phenotype of this model. Based on our findings, ESC may be further studied as a potential neuroprotective agent in a rodent transgenic model of HD

    Rhinolithiasis-an unsual cause for a common symptom

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    Dihedral f-tilings of the sphere by rhombi and triangles

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    We classify, up to an isomorphism, the class of all dihedral f-tilings of S^2, whose prototiles are a spherical triangle and a spherical rhombus. The equiangular case was considered and classified in Ana M. Breda and Altino F. Santos, Dihedral f-tilings of the sphere by spherical triangles and equiangular well-centered quadrangles. Here we complete the classification considering the case of non-equiangular rhombi
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