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Search Results: 1 - 10 of 224296 matches for " Punit R. Gandhi "
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Uncertainty Analysis for a Simple Thermal Expansion Experiment
Dimitri R. Dounas-Frazer,Geoff Z. Iwata,Punit R. Gandhi
Physics , 2012, DOI: 10.1119/1.4789875
Abstract: We describe a simple experiment for measuring the thermal expansion coefficient of a metal wire and discuss how the experiment can be used as a tool for exploring the interplay of measurement uncertainty and scientific models. In particular, we probe the regimes of applicability of three models of the wire: stiff and massless, elastic and massless, and elastic and massive. Using both analytical and empirical techniques, we present the conditions under which the wire's mass and elasticity can be neglected. By accounting for these effects, we measure nichrome's thermal expansion coefficient to be 17.1(1.3) ppm/K, which is consistent with the accepted value at the 8% level.
Teaching lab the Compass way: Engaging students in authentic research practices and guided self-reflection
Punit R. Gandhi,Jesse A. Livezey,Anna M. Zaniewski,Daniel L. Reinholz,Dimitri R. Dounas-Frazer
Physics , 2014,
Abstract: Aligning science instruction with authentic scientific practices is a national priority in education. In particular, undergraduate laboratory courses have been criticized as employing recipe-style activities with little emphasis on inquiry and design. This paper offers an alternative laboratory-style course, offered via the Compass Project at UC Berkeley. Using a model-based approach, undergraduate physics students engaged in authentic research practices by iteratively refining their experimental and theoretical designs. The course also promoted lifelong learning skills, such as persistence and organization, through a cycle of student self-reflection and personalized instructor feedback. This cycle is a strategy for providing students with sociocultural support, which is particularly important for students from underrepresented groups in the sciences. We document growth in students' understanding of scientific measurement and, drawing on student reflections, we suggest areas for future research focused on improving students' lifelong learning skills.
Localized states in periodically forced systems
Punit Gandhi,Cédric Beaume,Edgar Knobloch
Physics , 2014, DOI: 10.1103/PhysRevLett.114.034102
Abstract: The theory of stationary spatially localized states in dissipative systems driven by time-independent forcing is well developed. With time-periodic forcing related but time-dependent structures may result. These may consist of breathing localized states, or states that grow for a time via nucleation of new cells followed by cell annihilation for a different length of time, all depending on the nature of the forcing oscillation. A phase diagram is computed locating different types of dynamical behavior in the parameter space of the periodically forced quadratic-cubic Swift--Hohenberg equation. An explanation of the phenomena observed is offered, based on asymptotic arguments.
A new resonance mechanism in the Swift--Hohenberg equation with time-periodic forcing
Punit Gandhi,Cédric Beaume,Edgar Knobloch
Physics , 2014,
Abstract: The generalized Swift--Hohenberg equation with a quadratic-cubic nonlinearity is used to study the persistence and decay of localized patterns in the presence of time-periodic parametric forcing. A novel resonance phenomenon between the forcing period and the time required to nucleate one wavelength of the pattern outside the pinning region is identified. The resonance generates distinct regions in parameter space characterized by the net number of wavelengths gained or lost in one forcing cycle. These regions are well described by an asymptotic theory based on the wavelength nucleation/annihilation time near the boundaries of the pinning region. The resulting theory leads to predictions that are qualitatively correct and, in some cases, provide quantitative agreement with numerical simulations.
Periodic phase-locking and phase slips in active rotator systems
Punit Gandhi,Cédric Beaume,Edgar Knobloch
Physics , 2015,
Abstract: A system consisting of a large number of identical active rotators can be described by an Adler equation with time-dependent frequency. A series of resonances between the period of the frequency modulation and the time scale for the generation of a phase slip is identified. The resulting parameter space structure is determined using a combination of numerical continuation, time simulations and asymptotic methods. Regions with an integer number of phase slips per period are separated by regions with noninteger numbers of phase slips, and include canard trajectories that drift along unstable equilibria. Both high and low frequency modulations of the frequency are considered. An adiabatic description of the slow modulation regime is found to be accurate over a large range of modulation periods.
The Compass Project: Charting a New Course in Physics Education
Nathaniel Roth,Punit Gandhi,Gloria Lee,Joel Corbo
Physics , 2012,
Abstract: This article tells the story of the founding of the Compass Project at UC Berkeley and describes its impacts. The Compass Project is a self-formed group of graduate and undergraduate students in the physical sciences. Its goals are to improve undergraduate physics education, provide our members with opportunities for professional development, and increase retention of students, especially those from populations typically underrepresented in the physical sciences. Compass fosters a diverse, collaborative student community by providing a wide range of services, including a summer program, fall and spring semester courses, mentoring, a research lecture series, and other academic and social support.
Marketing of medical care.
Gandhi R
Journal of Postgraduate Medicine , 1993,
Abstract:
Automatization of Forest Fire Detection Using Geospatial Technique  [PDF]
Shaily R. Gandhi, Tarun P. Singh
Open Journal of Forestry (OJF) , 2014, DOI: 10.4236/ojf.2014.44036
Abstract:
Healthy forest is the vital resource to regulate climate at a regional and global level. Forest fire has been regarded as one of the major reasons for the loss of forest and degradation of the environment. Global warming is increasing its intensity at an alarming rate. Real-time fire detection is a necessity to avoid large scale losses. Remote sensing is a quick and cheap technique for detecting and monitoring forest fires on a large scale. Advance Very Radiometer Resolution (AVHRR) has been used already for a long period for fire detection. The use of Moderate Resolution Imaging Radio Spectrometer (MODIS) for fire detection has recently preceded AVHRR and a large number of fire products are being developed. MODIS based forest fire detection and monitoring system can solve the problem of real-time forest fire monitoring. The system facilitates data acquisition, processing, reporting and feedback on the fire location information in an automated manner. It provides location information at 1 × 1 kilometer resolution on the active fires which are present during the satellite overpass twice a day. The users are provided with the information on SMS alert with fire location details, email notification, and online visualization of fire locations on website automatically. The whole processes are automated and provide better accuracy for fire detection.
Augmenter of liver regeneration
Chandrashekhar R Gandhi
Fibrogenesis & Tissue Repair , 2012, DOI: 10.1186/1755-1536-5-10
Abstract: Following the discovery that the liver possesses a remarkable ability to regenerate, pursuit to identify factors that are involved in this phenomenon led to the discovery of many mitogens, co-mitogens, and inhibitors. Among them was a protein initially named hepatic stimulatory substance or hepatopoietin and now commonly known as ‘Augmenter of liver regeneration’ (ALR). ALR was subsequently purified, and cloned in rat, mouse, and human. Both native and cloned ALR augment liver regeneration following partial hepatectomy and prevent pathology of portacaval shunt surgery in animal models. ALR is produced and secreted exclusively by hepatocytes in the liver and stimulates synthesis of TNF-α, IL-6, and nitric oxide in Kupffer cells via a G-protein coupled receptor. ALR may also exert actions on hepatocytes in an autocrine manner. Interestingly, intracellular ALR was found to be a survival factor as its depletion causes rapid mitochondrial dysfunction and apoptotic/necrotic death of hepatocytes. In this regard, ALR exhibits significant homology with ERV1 protein (essential for respiration and viability found in the yeast, Saccharomyces cerevisiae). Thus it is not a surprise that ALR is expressed ubiquitously in all organs, and may have tissue-specific functions. Furthermore, post-translational modification of the 22 kDa native ALR protein to three high molecular weight species (38 to 42 kDa), and presence of ALR in mitochondria, cytosol, endoplasmic reticulum, and nucleus indicate that ALR may play an important role in various physiological functions in a cell. Current evidence indicates that ALR may be involved in mitochondrial oxidative phosphorylation, reduction of cytochrome c, and in regulation of the activities of certain proteins by its sulfhydryl oxidase activity as well as by inducing Fe/S maturation of proteins. Thus, although ALR appears to have multiple functions, the knowledge of its roles in various organs, even in the liver, is very inadequate. In this arti
Tropical triamcinolone acetonide in an indigenous orabase in oral lichen planus
Gandhi Vijay,Pandhi R
Indian Journal of Dermatology, Venereology and Leprology , 1996,
Abstract:
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