276 research outputs found

    Discovering the Dimensions and Components of Interpretive Narrations Related to the Surat al Isra of The Holy Quran

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    Recognition of the elements of the interpretive narrations by using scientific methods will open the way to a comprehensive understanding of the words of the Fourteen Infallibles S A This way in which accessing analyzing and discussing the most important subjects focused by the Holy Prophet S and the other infallibles A S prepares the ground for starting a discussion and hypothesizing This research tries to answer the question what dimensions and components the interpretive narrations of the S rat al-Isr of the Holy Qur an have and how they are distributed in the phrases Allocating about half of the narrations to the recognition of the true guides indicates that the necessity of giving insight and awareness with regard to the station of the prophets especially the Prophet of Islam S the Imamate and Ahl al-bayt A S was focused by the Infallible

    KIC 6951642: confirmed Kepler γ\gamma Doradus-δ\delta Scuti star with intermediate to fast rotation in a possible single-lined binary system

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    KIC 6951642 has been reported as a candidate hybrid pulsator of type-γ\gamma Doradus-δ\delta Scuti from observations of the first quarters of the Kepler mission. We aim to investigate the pulsating nature of KIC 6951642 and to search for the signature of rotation and/or activity in the light curves. We performed an iterative frequency search of both Fourier spectra, and searched for regular patterns in them. We applied spectrum synthesis to determine the atmospheric stellar parameters. Since KIC 6951642 was reported to belong to a spectroscopic binary system, we fitted the time delays derived from the light curves with the radial velocities obtained from published as well as new spectra in an attempt to improve the quality of the first orbit. Follow-up spectroscopy showed that KIC 6951642 is a fast-rotating F0-type star in a possible single-lined binary with a period of \sim4.8 yr. In the low-frequency regime, we identified the frequencies of 0.721 d1^{-1} as well as of 0.0087 d1^{-1}. We attribute the first frequency to stellar rotation and the second one to stellar activity with a cycle. We also detected gg modes, with the strongest mode located at 2.238 d1^{-1}, as well as three asymmetric multiplets (with a mean spacing of 0.675±\pm0.044 d1^{-1}). In the high-frequency regime, we detected frequencies of type-δ\delta Scuti, with the strongest mode located at 13.96 d1^{-1}, as well as seven asymmetric multiplets (with a mean spacing of 0.665±\pm0.084 d1^{-1}). We subsequently identified a few more frequencies that appear to be combinations of a gg or pp mode and one of the higher cited frequencies not due to pulsations. We propose that KIC 6951642 accommodates for a fast-rotating γ\gamma Dor-δ\delta Sct hybrid star with various rotationally split multiplets of gg and pp modes and that it also displays a cycle lasting years of (possible) stellar activity

    Cost-Efficient Scheduling for Deadline Constrained Grid Workflows

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    Cost optimization for workflow scheduling while meeting deadline is one of the fundamental problems in utility computing. In this paper, a two-phase cost-efficient scheduling algorithm called critical chain is presented. The proposed algorithm uses the concept of slack time in both phases. The first phase is deadline distribution over all tasks existing in the workflow which is done considering critical path properties of workflow graphs. Critical chain uses slack time to iteratively select most critical sequence of tasks and then assigns sub-deadlines to those tasks. In the second phase named mapping step, it tries to allocate a server to each task considering task's sub-deadline. In the mapping step, slack time priority in selecting ready task is used to reduce deadline violation. Furthermore, the algorithm tries to locally optimize the computation and communication costs of sequential tasks exploiting dynamic programming. After proposing the scheduling algorithm, three measures for the superiority of a scheduling algorithm are introduced, and the proposed algorithm is compared with other existing algorithms considering the measures. Results obtained from simulating various systems show that the proposed algorithm outperforms four well-known existing workflow scheduling algorithms

    KIC~8975515: a fast-rotating (γ\gamma Dor - δ\delta Sct) hybrid star with Rossby modes and a slower δ\delta Sct companion in a long-period orbit

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    {KIC~8975515 is a \emph{Kepler} double-lined spectroscopic binary system with hybrid pulsations. Two components have similar atmospheric properties (Teff_{\rm eff} \sim 7400~K), and one of them is a fast rotator (vsini=162v\sin i = 162 versus 32 km/s). Our aim is to study the \emph {Kepler} light curve in great detail in order to determine the frequencies of the pulsations, to search for regular spacing patterns in the Fourier spectrum, if any, and to discuss their origin in the context of binarity and fast rotation. In this paper, we study the properties of the stellar pulsations based on a careful analysis in the low-, intermediate- and high-frequency regions of the Fourier spectrum. This is done by performing repeated frequency-search analyses with successive prewhitenings of all the significant frequencies detected in the spectrum. Moreover, we searched for regular period spacings among the gg modes, as well as frequency splitting among the gg and pp modes. In the low-frequency regime, five regular period spacing patterns including one series of prograde gg modes and four series of retrograde rr modes were detected. The rr modes are well-distributed with respect to the harmonics of the rotational frequency of the fast-rotating star frotf_{\rm rot} = 1.647 d1^{-1}. The dominant gg mode is f2f_{2} = 2.37 d1^{-1}. The strongest p mode, at f1f_{1} = 13.97 d1^{-1}, forms a singlet. In the high-frequency region, we identified two multiplets of regularly split pp modes with mean frequency spacings of 0.42 d1^{-1} and 1.65 d1^{-1}. We detected some series of retrograde rr and prograde gg modes as well as two multiplets of pp modes with frequency spacings related to the stellar rotation of both components of the twin system KIC~8975515. We identified the fast-rotating component as a hybrid pulsator with rr modes and the slowly-rotating component as a δ\delta Sct pulsator.Comment: Accepted to publish on A \&

    Cataract Grading in Pure Senile Cataracts: Pentacam versus LOCS III

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    Purpose: To determine the diagnostic accuracy of Pentacam Cataract Grading Scale (PCGS) versus the Lens Opacities Classification System (LOCS III) in scaling pure age-related cataract. Methods: Between April 2016 and May 2017, eyes of 281 patients were evaluated for grading of lens opacity. We used LOCS III and PCGS. Patients with pure age-related cataract with no previous history of eye surgery, eye trauma, or chronic systemic disease between 50 and 95 years of age were included. The examination of the patients was done, using slit lamp and LOCS III grading chart. The second examination was done a week later, using Oculus Pentacam. Next, we graded them using a PNS grading score. Spearman’s rank correlation and a Bland-Altman Plot were implemented for analysis using MedCalc 14. 8.1. P < O.05 was considered as statistically significant. Results: Three hundred eyes were examined. Of them, 189 patients were male, and patients between 70 to 80 years old were the most common group. The correlation between grades of two methods was 0.47 (P < 0.001). Results of the Bland-Altman plot showed a moderate alignment between the two methods. Conclusion: The association between LOCSIII and PCGS is not so favorable, however, it is an economical and effective method to assess lens opacities is LOCSIII. PCGS can be used in early diagnosis. For a definitive diagnosis and appropriate therapeutic intervention, an ophthalmological examination is needed

    Diseño y desarrollo de un modelo y planificación óptima para la responsabilidad de la cadena de suministro con el medio ambiente

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    La gestión responsable de los flujos de retorno de productos en entornos de producción e inventario es un requisito cada vez mayor para las empresas. Esto puede atribuirse a motivaciones económicas, ambientales y / o regulatorias. El modelado matemático detales sistemas ha ayudado a los procesos de toma de decisiones y ha proporcionado una mejor comprensión del comportamiento de dichos entornos de producción e inventario. Este artículo revisa la literatura sobre el modelado de sistemas de inventario de logística inversa que se basan en la orden económica / cantidad de producción (EOQ / EPQ) y la configuración del tamaño de lote económico conjunto (JELS) para analizar sistemáticamente las matemáticas involucradas en la captura de las principales característicasde los procesos relacionados. La literatura se examina y clasifica de acuerdo con los problemas específicos que se enfrentan y los supuestos del modelo. Se presta especial atención a las cuestiones ambientales. Hay indicios de la necesidad de que las matemáticas de los modelos de logística inversa sigan las tendencias actuales en los modelos de cadena de suministro y inventario "ecológicos". La modelización de la eliminación de residuos, las emisiones de gases de efecto invernadero y el consumo de energía durante la producción se considera la prioridad más urgente para el futuro de los modelos de logística inversa. Se presenta un ejemplo ilustrativo para modelar modelos de inventario de logística inversa con implicaciones ambientale

    Diseño y desarrollo de un modelo y planificación óptima para la responsabilidad de la cadena de suministro con el medio ambiente

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    The responsible management of product return flows in production and inventory environments is a rapidly increasing requirement for companies. This can be attributed to economic, environmental and/or regulatory motivations. Mathematical modeling of such systems has assisted decision-making processes and provided a better understanding of the behavior of such production and inventory environments. This paper reviews the literature on the modeling of reverse logistics inventory systems based on the economic order/production quantity (EOQ/EPQ) and the joint economic lot size (JELS) settings to systematically analyze the mathematics involved in capturing the main characteristics of related processes. The literature is surveyed and classified according to the specific issues faced and modeling assumptions. Special attention is given to environmental issues. There are indications of the need for reverse logistics models' mathematics to follow current trends in ‘greening’ inventory and supply-chain models. The modeling of waste disposal, greenhouse-gas emissions, and energy consumption during production is considered as the most pressing priority for the future of reverse logistics models. An illustrative example for modeling reverse logistics inventory models with environmental implications is presented.La gestión responsable de los flujos de retorno de productos en entornos de producción e inventario es un requisito cada vez mayor para las empresas. Esto puede atribuirse a motivaciones económicas, ambientales y / o regulatorias. El modelado matemático de tales sistemas ha ayudado a los procesos de toma de decisiones y ha proporcionado una mejor comprensión del comportamiento de dichos entornos de producción e inventario. Este artículo revisa la literatura sobre el modelado de sistemas de inventario de logística inversa que se basan en la orden económica / cantidad de producción (EOQ / EPQ) y la configuración del tamaño de lote económico conjunto (JELS) para analizar sistemáticamente las matemáticas involucradas en la captura de las principales características de los procesos relacionados. La literatura se examina y clasifica de acuerdo con los problemas específicos que se enfrentan y los supuestos del modelo. Se presta especial atención a las cuestiones ambientales. Hay indicios de la necesidad de que las matemáticas de los modelos de logística inversa sigan las tendencias actuales en los modelos de cadena de suministro y inventario "ecológicos". La modelización de la eliminación de residuos, las emisiones de gases de efecto invernadero y el consumo de energía durante la producción se considera la prioridad más urgente para el futuro de los modelos de logística inversa. Se presenta un ejemplo ilustrativo para modelar modelos de inventario de logística inversa con implicaciones ambientales
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