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Search Results: 1 - 10 of 392591 matches for " Sarasij R C "
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Chiral tilt texture domains in two dimensions
Sarasij R. C.,Madan Rao
Physics , 2007,
Abstract: We study the shape and texture of finite domains comprising chiral/achiral molecules carrying a tilt field embedded in a 2-dimensional surface. Using a combination of simulations and {\it exact} variational calculations, we determine the equilibrium (mean field) phase diagram in the achiral and chiral cases. We find a variety of novel shapes and textures including a {\it spontaneously broken chiral texture} when the molecules are achiral. We show that chiral tilt-domains nucleating in a region of two-phase coexistence, {\it repel} each other, thereby preventing coalescence and further growth. Our work has implications for tilt texture domains in phospholipid monolayers and giant unilamellar vesicles (GUVs), nucleating domains of Sm-C$^*$ in Sm-A films, and chiral emulsions in Sm-A films.
Active Fusion and Fission Processes on a Fluid Membrane
Madan Rao,Sarasij R C
Quantitative Biology , 2000, DOI: 10.1103/PhysRevLett.87.128101
Abstract: We investigate the steady states and dynamical instabilities resulting from ``particles'' depositing on (fusion) and pinching off (fission) a fluid membrane. These particles could be either small lipid vesicles or isolated proteins. In the stable case, such fusion/fission events suppress long wavelength fluctuations of the membrane. In the unstable case, the membrane shoots out long tubular structures reminiscent of endosomal compartments or folded structures as in internal membranes like the endoplasmic reticulum or Golgi. We argue that these fusion/fission events should be strongly affected by tension.
Tilt Texture Domains on a Membrane and Chirality induced Budding
R. C Sarasij,Madan Rao
Quantitative Biology , 2001, DOI: 10.1103/PhysRevLett.88.088101
Abstract: We study the equilibrium conformations of a lipid domain on a planar fluid membrane where the domain is decorated by a vector field representing the tilt of the stiff fatty acid chains of the lipid molecules, while the surrounding membrane is fluid and structureless. The inclusion of chirality in the bulk of the domain induces a novel budding of the membrane, which preempts the budding induced by a decrease in interfacial tension.
Application of Compressive Sampling in Computer Based Monitoring of Power Systems
Sarasij Das,Tarlochan Sidhu
Advances in Computer Engineering , 2014, DOI: 10.1155/2014/524740
Abstract: Shannon’s Nyquist theorem has always dictated the conventional signal acquisition policies. Power system is not an exception to this. As per this theory, the sampling rate must be at least twice the maximum frequency present in the signal. Recently, compressive sampling (CS) theory has shown that the signals can be reconstructed from samples obtained at sub-Nyquist rate. Signal reconstruction in this theory is exact for “sparse signals” and is near exact for compressible signals provided certain conditions are satisfied. CS theory has already been applied in communication, medical imaging, MRI, radar imaging, remote sensing, computational biology, machine learning, geophysical data analysis, and so forth. CS is comparatively new in the area of computer based power system monitoring. In this paper, subareas of computer based power system monitoring where compressive sampling theory has been applied are reviewed. At first, an overview of CS is presented and then the relevant literature specific to power systems is discussed. 1. Introduction Operation of electric power system has become increasingly complex due to high load growth, increasing market pressure, increasing interconnections of transmission lines, and penetration of variable renewable energy sources. As a result, system operators are forced to operate power grids near their operating limits. The occurrence of major blackouts in many power systems around the world has necessitated the use of better system monitoring and control methodologies. The analysis of the August 14, 2003, blackout has shown that the problems developed hours before the system collapse. If the system operators were aware of the overall worsening system conditions that were developing, certain actions could have been taken. Better system monitoring is only possible if the operator has better knowledge about the grid. As a result, power utilities are looking for new computer based smart devices and smart solutions for grid monitoring and control. An overview of smart grids can be found in [1, 2]. Computer technologies are being used to make traditional power generation, transmission, and distribution systems more efficient. Phasor Measurement Unit (PMU) based Wide Area Measurement Systems (WAMS) are being installed to monitor power system dynamics accurately. Communication networks are being upgraded to allow two way communications and send more and more information to control centers. Utilities are installing wireless smart meters [3, 4] with communication facilities in distribution systems. In [5], different smart grid
Urban Water Management: Best Practice Cases  [PDF]
C. R. Ramakrishnaiah
Current Urban Studies (CUS) , 2014, DOI: 10.4236/cus.2014.22009
Abstract:

Current water resources management practices in most developing countries result in unnecessarily high economic and environmental costs. The magnitude and consequences of such costs have spurred the emergence of a global consensus on principles for improving water resource management. India will face an acute scarcity of water by 2025, more than most nations in the developing world. There is compelling evidence that improved water resources policies can have major impacts. In a number of cases in developed and developing countries pricing and tariff combined with regulations have produced savings of 20% to 30% and more. Improving water management will require that developing countries address the major constraints that currently undermine the allocation and efficient use of their water resources. Experiences in both developing and developed countries, as presented in this article, showed that improved policies for conservation and reallocation can have major benefits. The concerned authorities should look for various alternatives such as rainwater harvesting, recycling of wastewater, reducing un-accounted water and other options. Rainwater harvesting should be made compulsory; wastewater reuse has to be made with dual water supply system for new layouts. As the suburbs in the city are increasing day by day, rainwater harvesting would be able to serve the city for much longer time.

Health of Nurses with Leadership and Management Functions: An Integrative Review  [PDF]
C. Gonnelli, R. Raffagnino
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.610010
Abstract: The purpose of this paper is to present findings of an integrative literature review related to health and wellbeing of nurses with leadership and management functions and its associated factors, in order to provide the best available evidence on this topic. A large body of knowledge related to nursing health and well-being exists, but little we know about this topic in a nurse leadership and management role. It is a complex role in nursing that implies both clinical and leadership knowledge and abilities. A comprehensive search of electronic databases, focusing on articles published in English and Italian languages during 2009-2018, was completed. A three-step approach was used and from the original 1345 studies, 17 papers were included in this systematic literature review. Two independent reviewers analyzed these papers for critical appraisal on methodological quality and their topics. Narrative synthesis of the empirical literature allowed highlighting the most important results related to the topic investigated. This integrative review has shown that nurse leader and manager roles are stressful mainly for its specific functions and job demands. Directions for future high-quality research are suggested both to deepen the relative importance of the specific risk and protective health factors in nursing leadership roles.
Using Microgripper in Development of Automatic Adhesive Glue Transferring and Binding Microassembly System  [PDF]
R. J. CHANG, C. C. CHEN
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.21001
Abstract: A system using microgripper for gluing and adhesive bonding in automatic microassembly was designed, implemented, and tested. The development of system is guided by axiomatic design principle. With a compliant PU microgripper, regional-edge-statistics (RES) algorithm, and PD controller, a visual-servoing system was implemented for gripping micro object, gluing adhesive, and operating adhesive bonding. The RES algorithm estimated and tracked a gripper’s centroid to implement a visual-servoing control in the microassembly operation. The main specifications of the system are: gripping range of 60~80μm, working space of 7mm×5.74mm×15mm, system bandwidth of 15Hz. In the performance test, a copper rod with diameter 60μm was automatically gripped and transported for transferring glue and bonding. The 60μm copper rod was dipped into a glue container and moved, pressed and bonding to a copper rod of 380μm. The amount of binding glue was estimated about 5.7nl.
Depression in Chronic Kidney Disease and Hemodialysis Patients  [PDF]
C. P. Andrade, R. C. Sesso
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.311146
Abstract: Depression is the most common psychiatric condition in Chronic Kidney Disease (CKD), but there are few studies that analyzed this condition in patients in different phases of disease. This article aims to evaluated depression in CKD patients, comparing patients in different phases of disease. Methods: We evaluated 134 patients with CKD submitted to conservative ambulatory treatment, and 36 patients with end-stage renal disease undergoing hemodialysis (HD). To evaluate depression, we used the Beck Depression Inventory (BDI), and the Beck Depression Inventory—SF (BDI-SF), a subscale that allows evaluate only the cognitive aspects of depression. Functional capacity was evaluated using the Karnofsky Performance Scale, and clinical and sociodemographic variables were also investigated. Results: Using BDI, depression was identified in 37.3% of patients in conservative treatment and in 41.6% in HD patients (p > 0.05). This percentage reduced when the BDI-SF was used, to 11.1% in conservative CKD patients and 13.8% in HD patients (p > 0.05). Depression was associated with marital status, professional activity, income, comorbidities and functional capacity. Discussion: We observed high prevalence of depression in patients with CKD undergoing conservative or hemodialysis treatment. Depression was associated with some clinical and sociodemografic variables and with functional capacity.
A Motor Management Strategy for Optimising Energy Use and Reducing Life Cycle Costs  [PDF]
V. Dlamini, R. C. Bansal, R. Naidoo
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24060
Abstract: With increasing energy costs and renewed focus on using energy in ways that support the environment, a structured approach is required to ensure that energy is used efficiently. A comprehensive motor management strategy to reduce motor life cycle costs while increasing reliability is presented. The application of energy management principles is combined with benefits that can
be obtained from using energy-efficiency motors. An economic model for determining the optimal time a motor should be replaced with a higher efficiency motor is proposed. The strategy presented incorporates benefits that can be obtained from using in-situ motor efficiency estimation and condition monitoring techniques as part of a motor management system.
Fast Finite Difference Solutions of the Three Dimensional Poisson’s Equation in Cylindrical Coordinates  [PDF]
Alemayehu Shiferaw, R. C. Mittal
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.34045
Abstract:

In this work, the three-dimensional Poisson’s equation in cylindrical coordinates system with the Dirichlet’s boundary conditions in a portion of a cylinder for is solved directly, by extending the method of Hockney. The Poisson equation is approximated by second-order finite differences and the resulting large algebraic system of linear equations is treated systematically in order to get a block tri-diagonal system. The accuracy of this method is tested for some Poisson’s equations with known analytical solutions and the numerical results obtained show that the method produces accurate results.

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