19,309 research outputs found

    Flux Tube Model Signals for Baryon Correlations in Heavy Ion Collisions

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    The flux tube model offers a pictorial description of what happens during the deconfinement phase transition in QCD. The 3-point vertices of a flux tube network lead to formation of baryons upon hadronisation. Therefore, correlations in the baryon number distribution at the last scattering surface are related to the preceding pattern of the flux tube vertices, and provide a signature of the nearby deconfinement phase transition. I discuss the nature of the expected signal, which should be observable in heavy ion collisions at RHIC and LHC.Comment: LaTeX, 9 pages, 5 figures, (v2) Several arguments expanded for clarity, (v3) Minor typesetting changes, published versio

    EFFECT OF SLIP VELOCITY ON THE PERFORMANCE OF A SHORT BEARING LUBRICATED WITH A MAGNETIC FLUID

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    This paper aims at analyzing the effect of velocity slip on the behavior of a magnetic fluid based infinitely short hydrodynamic slider bearing. Solving the Reynolds’ equation, the expression for pressure distribution is obtained. In turn, this leads to the calculation of the load carrying capacity. Further, the friction is also computed. It is observed that the magnetization paves the way for an overall improved performance of the bearing system. However the magnetic fluid lubricant fails to alter the friction. It is established that the slip parameter needs to be kept at minimum to achieve better performance of the bearing system, although the effect of the slip parameter on the load carrying capacity is in most situations, negligible. It is found that for large values of the aspect ratio, the effect of slip is increasingly significant. Of course, the aspect ratio plays a crucial role in this improved performance. Lastly, it is established that the bearing can support a load even in the absence of flow, which does not happen in the case of a conventional lubricant

    EFFECT OF SLIP VELOCITY ON THE PERFORMANCE OF A SHORT BEARING LUBRICATED WITH A MAGNETIC FLUID

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    This paper aims at analyzing the effect of velocity slip on the behavior of a magnetic fluid based infinitely short hydrodynamic slider bearing. Solving the Reynolds’ equation, the expression for pressure distribution is obtained. In turn, this leads to the calculation of the load carrying capacity. Further, the friction is also computed. It is observed that the magnetization paves the way for an overall improved performance of the bearing system. However the magnetic fluid lubricant fails to alter the friction. It is established that the slip parameter needs to be kept at minimum to achieve better performance of the bearing system, although the effect of the slip parameter on the load carrying capacity is in most situations, negligible. It is found that for large values of the aspect ratio, the effect of slip is increasingly significant. Of course, the aspect ratio plays a crucial role in this improved performance. Lastly, it is established that the bearing can support a load even in the absence of flow, which does not happen in the case of a conventional lubricant

    NVA: A Value Addition Measure For Capital Project Evaluation

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    Corporate financial objective of stockholder wealth maximization and use of discounted cash flow methods for evaluation of capital projects are two of the well-accepted tenets of financial management. Present project evaluation methods, including the Net Present Value (NPV) technique, do not fully meet the stockholder wealth maximization criteria. This paper attempts to scrutinize the relevance of the NPV method in achieving the wealth maximization objective and suggests an alternative value addition measure, named Net Value Added (NVA). In the NPV method, all cash flows pertaining to a project are lumped together and discounted with one single rate, the weighted average cost of capital. The NVA method advocates that a project’s residual (net of its debt servicing) cash flows that belong to stockholders should be classified on the basis of their end-use, viz., equity servicing, capital maintenance, and value creating surplus cash flows.  As the risks associated with each of these three stockholders’ cash flows are not the same, they are separately discounted at appropriate rate depending upon the associated risk. Power of time (n) is assigned only to real risk-free rate of return and inflation premium to discount equity servicing and capital maintenance cash flows that are subject to exponential growth over time but not to the risk premium

    Strong Non Split Block Domination in Graphs

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    For any graph G=( V,E ), the block graph B(G) is a graph whose set of vertices is the union of the set of blocks of G in which two vertices are adjacent if and only if the corresponding blocks of G are adjacent. A dominating set D of a graph B(G) is a strong non split block dominating set if the induced sub graph ?V[B(G) ]-D? is complete. The strong non split block domination number? ??_(snsb ) (G) of G is the minimum cardinality of strong non split block dominating set of G. In this paper, we study graph theoretic properties of ? ??_(snsb ) (G) and many bounds were obtain in terms of elements of G and its relationship with other domination parameters were found. DOI: 10.17762/ijritcc2321-8169.150712

    Split Middle Domination in Graphs

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    The middle graph of a graph G, denoted by M(G) is a graph whose vertex set is V(G)?E(G) and two vertices are adjacent if they are adjacent edges of G or one is a vertex and other is an edge incident with it. A dominating set D of M(G) is called split dominating set of M(G) if the induced subgraph ?V[M(G) ]-D? is disconnected. The minimum cardinality of D is called the split middle domination number of G and is denoted by? ??_SM (G). In this paper many bound on ? ??_SM (G) were obtained in terms of the vertices, edges and many other different parameters of G but not in terms of the elements of M(G). Further its relation with other different parameters are also developed

    Evaluation of Diuretic Activity of Aqueous and Methanol Extracts of Lepidium sativum Garden Cress (Cruciferae) in Rats

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    Purpose: The present study was undertaken to investigate diuretic effect of aqueous and methanol extracts of the dried seeds of Lepidium sativum in normal rats.Method: Aqueous and methanol extracts of L. sativum seeds were administered to experimental rats orally at doses of 50 and 100 mg/kg p.o. Hydrochlorothiazide (10 mg/kg) was used as positive control instudy. The diuretic effect of the extracts was evaluated by measuring urine volume, sodium and potassium content, conductivity and pH.Result: Urine volume was significantly increased by the two doses of aqueous and methanol extracts in comparison to control group. While the excretion of sodium was also increased by both extracts, potassium excretion was only increased by the aqueous extract at a dose of 100 mg/kg. There was no significant change in the conductivity and pH of urine after administration of the L. sativum extracts. The diuretic effect of the extracts was comparable to that of the reference standard (hydrochlorothiazide) and the methanol had the additional advantage of a potassium-conserving effect.Conclusion: We can conclude that aqueous and methanol extracts of L. sativum produced notable diuretic effect which appeared to be comparable to that produced by the reference diuretic HCTZ. The present study provides a quantitative basis for explaining the folkloric use of L. sativum as a diuretic agent in Moroccan population

    Affective problems and decline in cognitive state in older adults: a systematic review and meta-analysis

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    Evidence suggests that affective problems, such as depression and anxiety, increase risk for late-life dementia. However, the extent to which affective problems influence cognitive decline, even many years prior to clinical diagnosis of dementia, is not clear. The present study systematically reviews and synthesises the evidence for the association between affective problems and decline in cognitive state (i.e. decline in non-specific cognitive function) in older adults. An electronic search of PubMed, PsycInfo and ScienceDirect was conducted to identify studies of the association between depression and anxiety separately and decline in cognitive state. Key inclusion criteria were prospective, longitudinal designs with a minimum follow-up period of one year. Data extraction and methodological quality assessment using the STROBE checklist were conducted independently by two raters. A total of 34 studies (n=71,244) met eligibility criteria, with 32 studies measuring depression (n=68,793), and 5 measuring anxiety (n=4,698). A multi-level meta-analysis revealed that depression assessed as a binary predictor (OR=1.36, 95% CIs: 1.05-1.76, p=.02) or a continuous predictor (B=-0.008, 95% CIs: -0.015, -0.002, p=.012; OR=0.992, 95% CIs: 0.985-0.998) was significantly associated with decline in cognitive state. The number of anxiety studies were insufficient for meta-analysis and are instead described in a narrative review. Results of the present study improve current understanding of the temporal nature of the association between affective problems and decline in cognitive state. They also suggest that cognitive function need to be monitored closely in individuals with affective disorders, as these individuals may be at a particular risk of greater cognitive decline

    A study of histopathological spectrum of central nervous system lesions at a tertiary health care center of South Gujarat, India

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    Background: Central nervous system lesions can have varied aetiology like infectious, inflammatory and neoplastic. Establishing an accurate aetiology is essential for timely diagnosis and neurosurgical intervention. The annual incidence of tumours of CNS ranges from 10 to 17 per 100,000 people for intracranial tumours and 1 to 2 per 100,000 people for intraspinal tumours; the majority of these are primary tumours, and only one fourth to one half are metastastic. The present study attempts to provide preliminary data on morphological patterns of intracranial lesions and to study clinicopathological spectrum.Methods: The present study was carried out at a tertiary care center from January 2015 to September 2017. A total of 65 cases of CNS lesions were analyzed. In case of CNS tumours reporting were done according to WHO criteria for classification and grading.Results: Out of 65 cases studied, 51 cases (78.46%) were of neoplastic lesions and 14 cases (21.54%) of non-neoplastic lesions. Among 14 cases of non-neoplastic lesions 2 cases were of reactive/cystic lesions, 4 cases  were of infective lesions, and 8 cases were of congenital lesions. In the present study, out of 51 neoplastic cases most common cases were of astrocytoma.Conclusions: The exact histopathological diagnosis of Central Nervous system lesions is essential to predict the prognosis and treatment. Management strategies and prognosis of tumours depends on the correlation of factors like the types, grades of tumours, its location, size and stage of development

    Jyotismati Taila and Ashtamangal Ghrita Nasya in the management of Mental Retardation - A Comparative Study

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    Mental retardation is still elusive to researchers due to multidimensionality of psychological, medical, educational and social aspects, which alters mental functions and capability. Mental sub capability divided in 4 categories, Mild, Moderate, Severe and Profound. Chief aim of management of mental retardation is to make child more capable of performing common activities of everyday life by positive improvement in mental sub-capability. Mental retardation required multidimensional management approach. Present study focused on medicinal intervention, particularly analysis of comparative effectiveness of selected drug formulations (Astamangalghrita and Jyotismatitaila) from classical text of Ayurveda. Study design with the aims to compare the effectiveness of Jyotismatitaila and Astamangal Ghrita Nasya on Mental retardation. Assessment were based on Mental Status Score and IQ score taken before starting of treatment and after completion of treatment in both group. Obtained data was analyzed statistically. In this study, from result we conclude that both drugs are effective to improve Mental Status parameter and in IQ, but higher percentage and significance wise Jyotismati Taila had better result than Astamangal Ghrita Nasya
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