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Sphenoid wing meningioma presenting as hemi-parkinsonism: Case report
Shah K,Rajshekhar V
Neurology India , 2004,
Abstract:
Statins: Cost analysis in Indian scenario from eight major clinical trials
Sanmukhani J,Shah V
Journal of Postgraduate Medicine , 2010,
Abstract: Background and Aims: Coronary heart disease (CHD) is the leading cause of death in India resulting in loss of young Indians. Statins have proved to reduce the CHD mortality in various clinical trials. The aim of the study is to find the cost-effectiveness ratio (CER) for each major coronary event averted and a coronary death avoided by use of statins in different clinical settings based on the data from the major clinical trials on statins. Materials and Methods: Using electronic database and as per our inclusion and exclusion criteria we selected the West of Scotland Coronary Prevention Study (WOSCOPS), the Air Force Coronary Atherosclerosis Prevention Study (AFCAPS) and the Anglo-Scandinavian Cardiac Outcomes Trial--Lipid Lowering Arm (ASCOT-LLA) study for primary prevention; the Cholesterol and Recurrent Events Trial (CARE), the Long-term Intervention with Pravastatin in Ischemic Disease (LIPID) Study and the Scandinavian Simvastatin Survival Study (4S) for secondary prevention and two studies, the Heart Protection Study (HPS) and the Pravastatin in elderly individuals at risk of vascular disease (PROSPER) study for high-risk patients. The results of these studies were used for cost-effectiveness analysis of statins in different patient groups. Statistical Analysis: Absolute risk reduction, Number Needed to Benefit (NNTB), NNTB/year for total sample and in subgroups of males, females and age >65 was derived. CER for branded and generic versions was calculated by using the prices of statins listed in Indian Drug Review Triple i. Results: Cost-effectiveness ratio (CER) in primary prevention studies i.e., the WOSCOPS, the AFCAPS and the ASCOT-LLA was Rs. 25.8 lacs, Rs. 23.8 lacs and Rs. 7.9 lacs per major coronary event averted respectively. CER in secondary prevention studies i.e., the CARE and the LIPID was approximately Rs. 20 lacs per major coronary event averted while it was Rs. 52.4 lacs and Rs. 37 lacs per coronary heart disease (CHD) death avoided. CER from the 4S was Rs. 6.9 lacs per major coronary event and Rs. 16.9 lacs per CHD death averted. CER in the HPS and the PROSPER study was Rs. 17.9 lacs and Rs. 27.1 lacs per major coronary event avoided in high-risk patients. Conclusion: Cost associated with the use of statins is higher in primary prevention as compared to secondary prevention. More studies are needed to confirm the cost-effectiveness of statins to make any decision for health policy.
Spin-Exchange-Relaxation-Free Magnetometry Using Elliptically-Polarized Light
V. Shah,M. V. Romalis
Physics , 2009,
Abstract: Spin-exchange relaxation free alkali-metal magnetometers typically operate in the regime of high optical density, presenting challenges for simple and efficient optical pumping and detection. We describe a high-sensitivity Rb magnetometer using a single elliptically-polarized off-resonant laser beam. Circular component of the light creates relatively uniform spin polarization while the linear component is used to measure optical rotation generated by the atoms. Modulation of the atomic spin direction with an oscillating magnetic field shifts the detected signal to high frequencies. Using a fiber-coupled DFB laser we achieve magnetic field sensitivity of 7 fT/$\sqrt{% \mathrm{Hz}}$ with a miniature $5\times5\times5$ mm Rb vapor cell.
Portfolio Management: Stock Ranking by Multiple Attribute Decision Making Methods  [PDF]
Haresh V. Dedania, Vipul R. Shah, Rajesh C. Sanghvi
Technology and Investment (TI) , 2015, DOI: 10.4236/ti.2015.64016
Abstract: An investor would like to build a balanced portfolio with stocks representing different sectors. Several researchers have attempted the portfolio selection problem by different methods. Many of these methods consider companies of different sectors together. However, it can be argued that the attributes affecting the company’s growth vary for different sectors. Therefore, it is advisable to compare a company with the companies of the same sector. There are many options for the selection of a stock from a particular sector. A stock ranking method is proposed by using MADM methods based on overall performance under a stochastic environment. Of many MADM methods, SAW, AHP, TOPSIS, and VIKOR are applied. Usually, Euclidean distances (2-norm) are considered in the implementation of TOPSIS and VIKOR methods. In this work, this norm is generalized to p-norm, where p > 1. The model is tested for 13 companies in the field of Information Technology sector (IT) listed on National Stock Exchange in India and 13 criteria as performance indicators of a company. A MATLAB GUI system is developed and the results are obtained for several values of p in case of TOPSIS and VIKOR methods besides other methods. As the result indicates, the ordering is not much affected by different values of p in certain range. Moreover, higher values of p have adverse effect on the ordering. The proposed model is able to provide better information on the overall performance of a particular stock in comparison with its peers. The results obtained by various methods clearly separate good companies from inferior companies though the exact ordering slightly differs.
Characterization of hydroxybenzoic acid chelating resins: equilibrium, kinetics, and isotherm profiles for Cd(II) and Pb(II) uptake
BHAVNA A. SHAH,AJAY V. SHAH,RITESH V. TAILOR
Journal of the Serbian Chemical Society , 2011,
Abstract: Chelating ion-exchange resins were synthesized by polycondensation of ortho/para hydroxybenzoic acid with resorcinol/catechol employing formaldehyde as cross-linking agent at 80±5 °C in DMF. The resins were characterized by FTIR and XRD. The uptake behaviour of synthesized resins for Cd(II) and Pb(II) ions have been studied depending on contact time, pH, metal ion concentration and temperature. The sorption data obtained at optimized conditions were analyzed by the Langmuir and Freundlich isotherms. Experimental data of all metal–resin system were best represented by the Freundlich isotherm. The maximum obtained sorption capacity for cadmium was 69.53 mg g-1 and 169.32 mg g-1 for Lead. The adsorption process follows first order kinetics and the specific rate constant Kr was obtained by the application of the Lagergan equation. Thermodynamic parameters Gads, Sads and Hads were calculated for the metal–resin systems. The external diffusion rate constant (KS) and the intra-particle diffusion rate constant (Kid) were calculated by the Spahn–Schlunder and Weber–Morris models, respectively. The sorption process was found to follow an intra-particle diffusion phenomenon.
Microscopic analysis of the superconducting quantum critical point: Finite temperature crossovers in transport near a pair-breaking quantum phase transition
N. Shah,A. V. Lopatin
Physics , 2007, DOI: 10.1103/PhysRevB.76.094511
Abstract: A microscopic analysis of the superconducting quantum critical point realized via a pair-breaking quantum phase transition is presented. Finite temperature crossovers are derived for the electrical conductivity, which is a key probe of superconducting fluctuations. By using the diagrammatic formalism for disordered systems, we are able to incorporate the interplay between fluctuating Cooper pairs and electrons, that is outside the scope of a time-dependent Ginzburg Landau or effective bosonic action formalism. It is essential to go beyond the standard approximation in order to capture the zero temperature correction which results purely from the (dynamic) quantum fluctuations and dictates the behavior of the conductivity in an entire low temperature quantum regime. All dynamic contributions are of the same order and conspire to add up to a negative total, thereby inhibiting the conductivity as a result of superconducting fluctuations. On the contrary, the classical and the intermediate regimes are dominated by the positive bosonic channel. Our theory is applicable in one, two and three dimensions and is relevant for experiments on superconducting nanowires, doubly-connected cylinders, thin films and bulk in the presence of magnetic impurities, magnetic field or other pair-breakers. A window of non-monotonic behavior is predicted to exist as either the temperature or the pair-breaking parameter is swept.
Overlay Structure for Large Scale Content Sharing: Leveraging Geography as the Basis for Routing Locality
Shah Asaduzzaman,Gregor v. Bochmann
Computer Science , 2009,
Abstract: In this paper we place our arguments on two related issues in the design of generalized structured peer-to-peer overlays. First, we argue that for the large-scale content-sharing applications, lookup and content transport functions need to be treated separately. Second, to create a location-based routing overlay suitable for content sharing and other applications, we argue that off-the-shelf geographic coordinates of Internet-connected hosts can be used as a basis. We then outline the design principles and present a design for the generalized routing overlay based on adaptive hierarchical partitioning of the geographical space.
GeoP2P: An adaptive peer-to-peer overlay for efficient search and update of spatial information
Shah Asaduzzaman,Gregor v. Bochmann
Computer Science , 2009,
Abstract: This paper proposes a fully decentralized peer-to-peer overlay structure GeoP2P, to facilitate geographic location based search and retrieval of information. Certain limitations of centralized geographic indexes favor peer-to-peer organization of the information, which, in addition to avoiding performance bottleneck, allows autonomy over local information. Peer-to-peer systems for geographic or multidimensional range queries built on existing DHTs suffer from the inaccuracy in linearization of the multidimensional space. Other overlay structures that are based on hierarchical partitioning of the search space are not scalable because they use special super-peers to represent the nodes in the hierarchy. GeoP2P partitions the search space hierarchically, maintains the overlay structure and performs the routing without the need of any super-peers. Although similar fully-decentralized overlays have been previously proposed, they lack the ability to dynamically grow and retract the partition hierarchy when the number of peers change. GeoP2P provides such adaptive features with minimum perturbation of the system state. Such adaptation makes both the routing delay and the state size of each peer logarithmic to the total number of peers, irrespective of the size of the multidimensional space. Our analysis also reveals that the overlay structure and the routing algorithm are generic and independent of several aspects of the partitioning hierarchy, such as the geometric shape of the zones or the dimensionality of the search space.
High Bandwidth Atomic Magnetometery with Continuous Quantum Non-demolition Measurements
V. Shah,G. Vasilakis,M. V. Romalis
Physics , 2009, DOI: 10.1103/PhysRevLett.104.013601
Abstract: We describe an experimental study of spin-projection noise in a high sensitivity alkali-metal magnetometer. We demonstrate a four-fold improvement in the measurement bandwidth of the magnetometer using continuous quantum non-demolition (QND) measurements. Operating in the scalar mode with a measurement volume of 2 cm^3 we achieve magnetic field sensitivity of 22 fT/Hz^(1/2) and a bandwidth of 1.9 kHz with a spin polarization of only 1%. Our experimental arrangement is naturally back-action evading and can be used to realize sub-fT sensitivity with a highly polarized spin-squeezed atomic vapor.
Stroboscopic back-action evasion in a dense alkali-metal vapor
G. Vasilakis,V. Shah,M. V. Romalis
Physics , 2010, DOI: 10.1103/PhysRevLett.106.143601
Abstract: We explore experimentally quantum non-demolition (QND) measurements of atomic spin in a hot potassium vapor in the presence of spin-exchange relaxation. We demonstrate a new technique for back-action evasion by stroboscopic modulation of the probe light. With this technique we study spin noise as a function of polarization for atoms with spin greater than 1/2 and obtain good agreement with a simple theoretical model. We point that in a system with fast spin-exchange, where the spin relaxation rate is changing with time, it is possible to improve the long-term sensitivity of atomic magnetometry by using QND measurements.
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