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匹配条件: “Bhatt P” ,找到相关结果约200919条。
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Controls on Gosaikunda Lake Chemistry within Langtang National Park in High Himalaya, Nepal  [PDF]
Maya P. Bhatt, Seema Bhatt, Birgit Gaye
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.510094
Abstract: Surface water samples and lake bed sediments were collected and analyzed from Gosaikunda Lake within Langtang National Park (28°05'N, 85°25'E; 4380 m a.s.l.) in the central Himalayan region of Nepal during fall 2011. The major cations and anions in equivalents were present in the following order: \"\" and \"\", respectively. Sulfide oxidation coupled with carbonate dissolution and aluminosilicate dissolution appeared to be the dominant geochemical processes determining lake water dissolved ions. Sulfate concentration was much higher than the alkalinity which is
MRI Findings in Post-Operative Bilateral Posterior Ischemic Optic Neuropathy  [PDF]
Nirali P. Bhatt, Robert E. Morales, Michaela K. Mathews
Open Journal of Ophthalmology (OJOph) , 2013, DOI: 10.4236/ojoph.2013.33013
Abstract:

A 62-year-old female complained of vision loss following multiple abdominal surgeries for mesenteric ischemia. The patients visual acuity was no light perception (NLP) in the right eye and hand motion (HM) at 1 in the left eye. Both pupils were unreactive and no relative afferent pupillary defect was noted. Anterior segment and fundus examination were unremarkable. T1 and T2 weighted MRI imaging of the brain was normal but diffusion weighted imaging (DWI) revealed areas of bright signal within both intraorbital optic nerves, confirming the diagnosis of posterior ischemic optic neuropathy.

Polarization measurements of Vega-like stars
H. C. Bhatt,Manoj P
Physics , 2000,
Abstract: Optical linear polarization measurements are presented for about 30 Vega-like stars. These are then compared with the polarization observed for normal field stars. A significant fraction of the Vega-like stars are found to show polarization much in excess of that expected to be due to interstellar matter along the line of sight to the star. The excess polarization must be intrinsic to the star, caused by circumstellar scattering material that is distributed in a flattened disk. A correlation between infrared excess and optical polarization is found for the Vega-like stars.
Real-Time Bid Optimization for Group-Buying Ads
Raju Balakrishnan,Rushi P Bhatt
Computer Science , 2012,
Abstract: Group-buying ads seeking a minimum number of customers before the deal expiry are increasingly used by the daily-deal providers. Unlike the traditional web ads, the advertiser's profits for group-buying ads depends on the time to expiry and additional customers needed to satisfy the minimum group size. Since both these quantities are time-dependent, optimal bid amounts to maximize profits change with every impression. Consequently, traditional static bidding strategies are far from optimal. Instead, bid values need to be optimized in real-time to maximize expected bidder profits. This online optimization of deal profits is made possible by the advent of ad exchanges offering real-time (spot) bidding. To this end, we propose a real-time bidding strategy for group-buying deals based on the online optimization of bid values. We derive the expected bidder profit of deals as a function of the bid amounts, and dynamically vary bids to maximize profits. Further, to satisfy time constraints of the online bidding, we present methods of minimizing computation timings. Subsequently, we derive the real time ad selection, admissibility, and real time bidding of the traditional ads as the special cases of the proposed method. We evaluate the proposed bidding, selection and admission strategies on a multi-million click stream of 935 ads. The proposed real-time bidding, selection and admissibility show significant profit increases over the existing strategies. Further the experiments illustrate the robustness of the bidding and acceptable computation timings.
Neural Correlates of Effective Learning in Experienced Medical Decision-Makers
Jonathan Downar, Meghana Bhatt, P. Read Montague
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027768
Abstract: Accurate associative learning is often hindered by confirmation bias and success-chasing, which together can conspire to produce or solidify false beliefs in the decision-maker. We performed functional magnetic resonance imaging in 35 experienced physicians, while they learned to choose between two treatments in a series of virtual patient encounters. We estimated a learning model for each subject based on their observed behavior and this model divided clearly into high performers and low performers. The high performers showed small, but equal learning rates for both successes (positive outcomes) and failures (no response to the drug). In contrast, low performers showed very large and asymmetric learning rates, learning significantly more from successes than failures; a tendency that led to sub-optimal treatment choices. Consistently with these behavioral findings, high performers showed larger, more sustained BOLD responses to failed vs. successful outcomes in the dorsolateral prefrontal cortex and inferior parietal lobule while low performers displayed the opposite response profile. Furthermore, participants' learning asymmetry correlated with anticipatory activation in the nucleus accumbens at trial onset, well before outcome presentation. Subjects with anticipatory activation in the nucleus accumbens showed more success-chasing during learning. These results suggest that high performers' brains achieve better outcomes by attending to informative failures during training, rather than chasing the reward value of successes. The differential brain activations between high and low performers could potentially be developed into biomarkers to identify efficient learners on novel decision tasks, in medical or other contexts.
Synthesis and antibacterial assessment of N -[4-(4-substituted phenyl)-1,3-thiazol-2-yl]-1,3,5-triazin-2-amine
Gahtori P,Das A,Bhatt H
Indian Journal of Pharmaceutical Sciences , 2009,
Abstract: In a wide search program towards new and efficient antibacterial agents, we assessed the extent to which physicochemical properties can be exploited to promote antibacterial activity associated with a series of substituted s-triazine. The synthesized compounds (1a-12b) were subsequently screened for their in vitro antibacterial activity against three gram positive ( Bacillus subtilis, Bacillus cereus, Staphylococcus aureus ) and three Gram-negative microorganism ( Salmonella typhi, Escherichia coli, Klebsiella aerogenes ) by the broth dilution technique, recommended by European Committee for antimicrobial susceptibility testing with reference to streptomycin.
GIS in Epidemiology: Applications and Services
Bhatt Bindu M, Joshi Janak P
National Journal of Community Medicine , 2012,
Abstract: There is a growing understanding and appreciation regarding the power of health and health-related information in planning and implementing health programs. Given these points and the fact that most health information is tied in some way to geography, it is becoming increasingly important that health professionals, organizations, and communities create systems that empower them to really take advantage of the many different types of information that is available and that can be brought to bare on health issues and program management. There are countless layers or types of health and health-related data for a given population or place. GIS allow people to organize, visualize, and analyze these data layers more effectively. GIS and related spatial analysis methods provide a set of tools for describing and understanding the changing spatial organization of health care, for examining its relationship to health outcomes and access, and for exploring how the delivery of health care can be improved. Geographic information systems (GIS) provide ideal platforms for the convergence of disease-specific information and their analyses in relation to population settlements, surrounding social and health services and the natural environment. They are highly suitable for analysing epidemiological data, revealing trends and interrelationships that would be more difficult to discover in tabular format. Moreover GIS allows policy makers to easily visualize problems in relation to existing health and social services and the natural environment and so more effectively target resources. This study highlights the application and relevance of GIS for improving the efficiency of public health services.
Bilateral subthalamic nucleus stimulation for Parkinson's disease
Doshi P,Chhaya N,Bhatt M
Neurology India , 2003,
Abstract:
Circumstellar disks around Herbig Ae/Be stars: polarization, outflows and binary orbits
G. Maheswar,P. Manoj,H. C. Bhatt
Physics , 2002, DOI: 10.1051/0004-6361:20020458
Abstract: The geometrical relationship between the distribution of circumstellar matter, observed optical linear polarization, outflows and binary orbital plane in Herbig Ae/Be stars is investigated. Optical linear polarization measurements carried out for a number of Herbig Ae/Be stars that are either known to be in binary systems and/or have bipolar jets are presented in this paper. Available information on the position angles of polarization, outflows and binary companions for Herbig Ae/Be stars is compiled and analysed for any possible correlations. In $\approx 85%$ of the sources the outflow position angle is within $30^{\circ}$ of being parallel or perpendicular to the polarization position angle. In $\approx 81%$ of the sources the binary position angle is within $30^{\circ}$ of being parallel or perpendicular to the polarization position angle. Out of 15 sources with bipolar outflows, 10 sources have the binary position angle within $30^{\circ}$ of being perpendicular to the outflow position angle. These results favour those binary formation mechanisms in which the binary components and the disks around individual stars or circumbinary disks are coplanar.
Non-emission line young stars of intermediate mass
P. Manoj,G. Maheswar,H. C. Bhatt
Physics , 2002, DOI: 10.1046/j.1365-8711.2002.05540.x
Abstract: We present optical spectra of four intermediate mass candidate young stellar objects that have often been classified as Herbig Ae/Be stars. Typical Herbig Ae/Be emission features are not present in the spectra of these stars. Three of them, HD 36917, HD 36982 and HD 37062 are members of the young Orion Nebula Cluster (ONC). This association constrains their ages to be < 1 Myr. The lack of appreciable near infrared excess in them suggests the absence of hot dust close to the central star. But they do possess significant amounts of cold and extended dust component as revealed by the large excess emission observed at far infrared wavelengths. Fractional infrared luminosity $L_{ir}/L_{\star}$ and the dust masses computed from IRAS fluxes are systematically lower than that found for Herbig Ae/Be stars but higher than those for Vega-like stars. These stars may then represent the youngest examples of Vega phenomenon known so far. In contrast, the other star in our sample, HD 58647, is more likely to be a classical Be star as evident from the low $L_{ir}/L_{\star}$, scarcity of circumstellar dust, low polarization, presence of H$\alpha$ emission and near infrared excess and far infrared spectral energy distribution consistent with free-free emission similar to other well known classical Be stars.
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