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Syracuse, NY, United States

Cramariuc B.,Center for Science and Technology | Scarlet R.,Technical University Gheorghe Asachi | Manea L.R.,Technical University Gheorghe Asachi | Lupu I.G.,Technical University Gheorghe Asachi | And 2 more authors.
Journal of Electrostatics

In order to increase the control on the fiber diameter we propose in this paper a methodology to determine stability domains of the process in which the electrospun fiber diameter can be predetermined and also controlled by means of the polymer solution flow and the applied voltage. To define these stability domains we employ a combination of analytical expressions depending on the location along the traveling jet. In the vicinity of the nozzle we employ the expression which links the fiber diameter with the kinematic viscosity of the polymer solution, nozzle-collector distance, solution density, liquid flow, electric current and intensity of the electrostatic field. At larger distances from the nozzle, the fiber diameter can be expressed as a function of solution density, liquid flow, intensity of the applied electrostatic field and distance from the nozzle. Close to the collector the fiber diameter can be expressed with respect to the superficial tension of the polymer solution, dielectric permittivity, liquid flow and intensity of the electric current. Under specific constrains, the superposition of the plots obtained from these mathematical expressions will be used to determine the stability domain for the fiber diameter in which the diameter can be controlled by two process parameters, namely applied voltage and polymer solution flow. Through this approach the present paper can contribute to increased control of the electrospinning process and thus enhanced applicability. © 2013 Elsevier B.V. Source

Jayamohan J.,LBS Institute of Technology for Women | Mujeeb A.,Center for Science and Technology
2014 1st International Conference on Computational Systems and Communications, ICCSC 2014

Photoelasticity, an optical technique for experimental stress analysis, is widely used for 2-D and 3-D analysis of components for getting the information of principal stress difference and principal stress direction at every point in the domain. The recent developments in digital image processing have given birth to a separate branch of photoelasticity called digital photoelasticity. This method can be successfully employed to determine the stresses in structures with complicated shapes and loading. This paper gives a review of integrated photoelasticity and of its application for residual stress measurement in indeterminate structures. Significant reported methods on Photoelasticity for stress determination of indeterminate structures for the last 30 years has been analysed. © 2014 IEEE. Source

Placek B.,University at Albany | Placek B.,Center for Science and Technology | Knuth K.H.,University at Albany | Angerhausen D.,NASA
Publications of the Astronomical Society of the Pacific

Planets emit thermal radiation and reflect incident light that they receive from their host stars. As a planet orbits its host star the photometric variations associated with these two effects produce very similar phase curves. If observed through only a single bandpass, this leads to a degeneracy between certain planetary parameters that hinder the precise characterization of such planets. However, observing the same planet through two different bandpasses gives much more information about the planet. Here we develop a Bayesian methodology for combining photometry from both Kepler and the Transiting Exoplanet Survey Satellite. In addition, we demonstrate via simulations that one can disentangle the reflected and thermally emitted light from the atmosphere of a hot-Jupiter as well as more precisely constrain both the geometric albedo and day-side temperature of the planet. This methodology can further be employed using various combinations of photometry from the James Webb Space Telescope, the Characterizing ExOplanet Satellite, or the PLATO mission. © 2016. The Astronomical Society of the Pacific. All rights reserved. Source

Pathrose B.,Cochin University of Science and Technology | Nampoori V.P.N.,Cochin University of Science and Technology | Radhakrishnan P.,Cochin University of Science and Technology | Mujeeb A.,Center for Science and Technology
Journal of Fluorescence

The dual beam thermal lens technique is an effective method for the measurement of fluorescence quantum yield of dye solutions. The concentration-dependent quantum yield of a novel dye of triaminotriphenylmethane family in ethanol is studied using this technique. The absolute fluorescence quantum yield is measured and is observed that the reduction in the quantum yield is due to the non-radiative relaxation of the absorbed energy. © 2014 Springer Science+Business Media New York. Source

Manea L.R.,Technical University Gheorghe Asachi | Cramariuc B.,Center for Science and Technology | Caunii V.,Technical University Gheorghe Asachi | Sandu I.,Al. I. Cuza University
Materiale Plastice

The present context of the international studies identifies the electrospinning process as one of the key technologies for obtaing nanofibers. The dynamics of the studies connected to the implementation of this technology is given by the great diversity of the applications of the obtained nanofibers which start from filtering mediums and separating membranes to sensors and actuators, implants, structures for the controlled release of drugs up to the molecular photonics. This paper aims to present a new equipment for obtaining the nanofibers from polymer solutions by means of the electrospinning technology. The suggested equipment accomplishes the computerized control of the electrospinning technological parameters on starting from the idea of modularity and automatic control of the electrospinning process. The equipment allows the real time control for the electrospinning process based on determination of both jet characteristics and the obtained nanofibers properties. Source

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