293,848 research outputs found

    On two-dimensional quantum gravity and quasiclassical integrable hierarchies

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    The main results for the two-dimensional quantum gravity, conjectured from the matrix model or integrable approach, are presented in the form to be compared with the world-sheet or Liouville approach. In spherical limit the integrable side for minimal string theories is completely formulated using simple manipulations with two polynomials, based on residue formulas from quasiclassical hierarchies. Explicit computations for particular models are performed and certain delicate issues of nontrivial relations among them are discussed. They concern the connections between different theories, obtained as expansions of basically the same stringy solution to dispersionless KP hierarchy in different backgrounds, characterized by nonvanishing background values of different times, being the simplest known example of change of the quantum numbers of physical observables, when moving to a different point in the moduli space of the theory.Comment: 20 pages, based on talk presented at the conference "Liouville field theory and statistical models", dedicated to the memory of Alexei Zamolodchikov, Moscow, June 200

    Rapid design of tool-wear condition monitoring systems for turning processes using novelty detection

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    Condition monitoring systems of manufacturing processes have been recognised in recent years as one of the key technologies that provide the competitive advantage in many manufacturing environments. It is capable of providing an essential means to reduce cost, increase productivity, improve quality and prevent damage to the machine or workpiece. Turning operations are considered one of the most common manufacturing processes in industry. It is used to manufacture different round objects such as shafts, spindles and pins. Despite recent development and intensive engineering research, the development of tool wear monitoring systems in turning is still ongoing challenge. In this paper, force signals are used for monitoring tool-wear in a feature fusion model. A novel approach for the design of condition monitoring systems for turning operations using novelty detection algorithm is presented. The results found prove that the developed system can be used for rapid design of condition monitoring systems for turning operations to predict tool-wear

    N=1 SUSY Conformal Block Recursive Relations

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    We present explicit recursive relations for the four-point superconformal block functions that are essentially particular contributions of the given conformal class to the four-point correlation function. The approach is based on the analytic properties of the superconformal blocks as functions of the conformal dimensions and the central charge of the superconformal algebra. The results are compared with the explicit analytic expressions obtained for special parameter values corresponding to the truncated operator product expansion. These recursive relations are an efficient tool for numerically studying the four-point correlation function in Super Conformal Field Theory in the framework of the bootstrap approach, similar to that in the case of the purely conformal symmetry.Comment: 12 pages, typos corrected, reference adde

    Air pollution and health indicators in a rapidly developing industrial port in the Sultanate of Oman

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    Background and Aims: Sohar Industrial Port (Sultanate of Oman), started to operate in 2006, containing many industries that may adversely contribute to the air quality and hence to the health status of the residents in its proximity. The study aim is to assess the health effects of air quality of the population living in the residential area around the industrial port. Methods: Health data for the area were obtained between January 1st 2006 and December 31st 2011 from the Ministry of Health, Oman. Exposure to air pollution was classified into exposure zones according to mixture methods such as, proximity, dispersion models and wind roses. Four exposure zones were developed, from High, Intermediate, Sohar city and Control zones. Age and gender standardized rates were calculated for respiratory, cardiovascular and allergic diseases in each exposure zone. Results: The crude rate ratios of respiratory diseases in the high, the intermediate and Sohar city were (1.91, 95% CI, 1.87, 1.95), (1.18, 95% CI, 1.15, 1.21) and (0.18, 95% CI, 0.18,0.19), respectively. For dermatitis, these rates were (2.16, 95% CI, 1.91,2.45) for the high exposure zone, (1.05, 95% CI, 0.91, 1.23) for the intermediate zone and (0.20, 95% CI, 0.17,0.23) for Sohar city. In addition, the high exposure zone showed an increasing yearly trend of the incidence rate from 2007 to 2009 in both respiratory diseases and dermatitis. Conclusion: Evidence of adverse health effects was found in the high and intermediate exposure zones. More rigorous modeling is underway, which will involve other diseases and confounders

    Knowledge management: Exploring the relationship between human capital and organisation structure capital

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    Human capital and its impact on the organisation structure capital are of paramount importance in the modern business organisations. This research in progress, which investigates and analyses the role that human capital plays in the determination of the organisation structure capital. The study is based on wide spectrum of current literature, which presents theoretical and practical research on the subject of study. Knowledge Management (KM) is systematic process based on models and technological integration, which helps in the development of the conceptual framework. It is assumed that KM leads to benefits for the organisation and provides a platform for future research. Also, it addresses KM impacts on human capital and the enhancement of organisational effectiveness. The procedure is established for the measurement of the effectiveness of knowledge management criteria. The study aims at large businesses in Syria. It is confirmed through the results and findings that models and processing of information through systematic structure is essential for the development of the manager’s capabilities which plays an important factor in defining the impact of human capital on the success of the organisation structure of a business

    Global well-posedness for the Schroedinger equation coupled to a nonlinear oscillator

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    The Schroedinger equation with the nonlinearity concentrated at a single point proves to be an interesting and important model for the analysis of long-time behavior of solutions, such as the asymptotic stability of solitary waves and properties of weak global attractors. In this note, we prove global well-posedness of this system in the energy space H\sp 1.Comment: 11 page

    Improving the anti-corrosion properties via surface modification for silicon dioxide by conductive polymer

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    The modification of silicon dioxide surface via polyaniline (PANI) prepared by in-situ polymerization method. PANI and PANI-SiO 2 were characterized using Fourier transform infrared; X-ray diffraction and digital multimeter was used to measure conductivities for samples. Morphology of the synthesized PANI and PANI-SiO2, were examined using scanning electron microscopy. Samples were then used as pigments through blended with acrylic paint and applied on the surface of carbon steel panels. Corrosion was evaluated for coating of carbon steel panels through; full immersion test, salt spray test and adhesion test up to standards; ASTMG 31, ASTM B117 and ASTM D3359 respectively. Corrosion rate and coating adhesion were calculated after finished exposed periods in acidic Medias. Digital camera also used for monitored corrosion visually on the surface of carbon steel specimens. The results revealed that acrylic paint pigmented by SiO2 modified by polyaniline, more efficiently in corrosion protection for carbon steel than each of PANI and SiO2

    Update on therapeutic options for Middle East Respiratory Syndrome Coronavirus (MERS-CoV)

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    This article is made available for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.INTRODUCTION: The Middle East Respiratory Syndrome Coronavirus (MERS-CoV) is an important emerging respiratory pathogen. MERS-CoV resulted in multiple hospital outbreaks within and outside the Arabian Peninsula. The disease has a high case fatality rate, with the need for a therapeutic option. Areas covered: In this review, we provide an overview of the progress in the development of therapeutic strategies for MERS. We searched PubMed, Embase, Cochrane, Scopus, and Google Scholar, using the following terms: 'MERS', 'MERS-CoV', 'Middle East respiratory syndrome' in combination with 'treatment' or 'therapy'. Expert commentary: There are multiple agents tried in vitro and in vivo. None of these agents were used in large clinical studies. Available clinical studies are limited to the use of the combination of interferon and other agents. These clinical studies are based solely on case reports and case series. There are no prospective or randomized trials. There is a need to have prospective and randomized clinical trials for the therapy of MERS-CoV. However, this strategy might be hampered by the sporadic cases outside the large hospital outbreaks
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