756 research outputs found

    Intermediate regimes in granular Brownian motion: Superdiffusion and subdiffusion

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    Brownian motion in a granular gas in a homogeneous cooling state is studied theoretically and by means of molecular dynamics. We use the simplest first-principle model for the impact-velocity dependent restitution coefficient, as it follows for the model of viscoelastic spheres. We reveal that for a wide range of initial conditions the ratio of granular temperatures of Brownian and bath particles demonstrates complicated non-monotonous behavior, which results in transition between different regimes of Brownian dynamics: It starts from the ballistic motion, switches later to superballistic one and turns at still later times into subdiffusion; eventually normal diffusion is achieved. Our theory agrees very well with the MD results, although extreme computational costs prevented to detect the final diffusion regime. Qualitatively, the reported intermediate diffusion regimes are generic for granular gases with any realistic dependence of the restitution coefficient on the impact velocity

    Electron-electron two stream instability in n-GaAs plasma embedded with a nanoparticle

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    Electron-electron two stream instability in many valley semiconductors like n-GaAs embedded with a nanoparticle has been studied in hydrodynamic regime. The ingredients of this study are the consideration of polar optical phonon as the dominant intravalley scattering mechanism and a drifted Maxwellian distribution for the carriers in each valley of the medium. A dispersion relation has been developed by the self consistent solution of the momentum transfer, continuity and Maxwell’s equations. Typical values of the parameters of n-GaAs at room temperature are considered for analyzing the dispersion relation of the electrostatic wave. Detail qualitative analysis of the convective instability of possible four modes of propagation reveals that the dispersion, propagation and gain profiles of all the four modes have been affected profoundly by the presence of a nanoparticle in the medium via electron plasma frequency of electron cloud present in the nanoparticle

    Moduli of parabolic sheaves and filtered Kronecker modules

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    We give functorial moduli construction of pure parabolic sheaves, in the sense of Alvarez-Consul and A. King, using the moduli of filtered Kronecker modules we introduced in our earlier work. We also use a version of S. G. Langton's result due to K. Yokogawa to deduce the projectivity of moduli of pure parabolic sheaves of maximal dimension. As an application of functorial moduli construction, we can get the morphisms at the level of moduli stacks.Comment: 27 pages, Some notations are changed for consistency, and relevant statements in Section 3 are correcte

    Proposal and Validation of Usability Model for Component Based Software System

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    Increasing demand of rapid and cost effective development of software system has increased the demand of Component Based Software Engineering (CBSE). In CBSE, software system is developed by using existing components. These components can be in-house components or third party components. To develop a Component Based Software System (CBSS), it is important to select the suitable component in such a manner that the components of the software system do not affect each other. To increase the acceptance of the CBSS among the users and the market value of the software industries, it is important to increase the usability of the CBSS. Several usability models have been proposed for traditional and object-oriented software system (OOSS), but there is no usability model for CBSS. Existing traditional and object-oriented models can’t be perfectly suitable for CBSS because of the unique characteristics of the components. This paper presents a usability model (UMCBSS) for CBSS. The proposed usability model is based on most significant usability factors. These factors are analysed from CBSS quality models. With the help of proposed model, usability is evaluated by using two different techniques i.e., centroid method and bisector method in MATLAB. Experimental results are also validated by using Center of Gravity (COG) and Mean-Max method. With the help of the proposed model, developers of the CBSS will be able to measure the usability of CBSS and to remove the usability flaws from the software system

    Prescription Based Recommender System for Diabetic Patients Using Efficient Map Reduce

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    Healthcare sector has been deprived of leveraging knowledge gained through data insights, due to manual processes and legacy record-keeping methods. Outdated methods for maintaining healthcare records have not been proven sufficient for treating chronic diseases like diabetes. Data analysis methods such as Recommendation System (RS) can serve as a boon for treating diabetes. RS leverages predictive analysis and provides clinicians with information needed to determine the treatments to patients. Prescription-based Health Recommender System (HRS) is proposed in this paper which aids in recommending treatments by learning from the treatments prescribed to other patients diagnosed with diabetes. An Advanced Density-Based Spatial Clustering of Applications with Noise (DBSCAN) clustering is also proposed to cluster the data for deriving recommendations by using winnowing algorithm as a similarity measure. A parallel processing of data is applied using map-reduce to increase the efficiency & scalability of clustering process for effective treatment of diabetes. This paper provides a good picture of how the Map Reduce can benefit in increasing the efficiency and scalability of the HRS using clustering

    Alternate Solution for effective Dust Suppression in Thermal Power Plant

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    Many thermal power plants use coal as their fuel. To handle the coal, each power station is equipped with a coal handling plant. The coal has to be sized, processed, and handled which should be done effectively and efficiently. While working in the coal handling plant the major factor which reduces staff efficiency is the working environment i.e. a dusty atmosphere. Lots of care is always taken to reduce dust emission. Generally all systems used in power station coal handling plants are wet dust suppression systems. In this paper the reasons for failure of these type of dust suppression system are discussed. The remedy for the improvement of this system is also given in this paper. The existing system can be easily modified by using ultrasonic system. The spray discharge should be proportional with dust emission. The solenoid valve should be open with proportion with quantity of dust generation. The possibility of such type of this system is discussed in this paper

    Submissive Osteoarthrectomy in Temporomandibular Joint Ankylosis- Subharti Experience

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    Objective: The purpose of this study is to assess the effectiveness of submissive osteoarthrectomy in temporomandibular  ankylosis patients.Patients and method: A total 15 patients (20 joints) were operated under general anaesthesia and in these 15 patients 5 were male and 10 were female. Out of these 15 patients 10 were suffering from unilateral TMJ ankylosis and 5 were with bilateral TMJ ankylosis. The age of the patients was ranged from 10-19 years with mean of 12.53 years. After exposure ankylotic mass a gap of 6mm was created to achieve the satisfactory mouth opening followed by interposing the temporalis myofacial flap and pedicled buccal fat pad between the cut ends of the bone.Result: All the patients were followed post-surgery for a minimum duration of 24 months. The mean post-operative mouth opening of the patients was 32.45 mm after 2 years with significant improvement in contralateral excursive and protrusive movements. In this case series no significant sign of heterotrophic calcification or reankylosis was noted and anatomical shape of the condyle was also achieved in all cases.Conclusion: Submissive osteoarthrectomy is a modification in surgical technique for the release of temporomandibular joint ankylosis has considerable results in terms of functional and esthetic outcome

    Review of the selection Criteria for energy auditor to identify the energy efficient projects

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    this study indicated the role of energy auditor to identify the energy efficient projects. Three main types of audits are: Preliminary, Single Purpose, and Comprehensive. Selecting the appropriate type of audit for your facility saves you time and money. Each type is distinguished by the level of detail and analysis required to complete the audit. The less detailed the audit, the less accurate the estimates of project costs and energy savings. Depending on your organization’s contracting requirements, the consultant who will conduct the energy audit and prepare the technical report can be selected either by sole source or competitive bid. The cost of an audit can be determined through price negotiations or competitive bidding. In either case, you must inform the bidders of the scope of the audit and its minimum reporting and analytical requirements, such as those contained in the Energy Commission’s feasibility study guide. This is to ensure that you are getting audit costs for comparable work
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