Time filter

Source Type

Nakhon Ratchasima, Thailand

The Suranaree University of Technology ) is in Nakhon Ratchasima, Thailand. The university was established on July 27, 1990, becoming fully operational in 1993.It is named after Thao Suranaree, the local heroine of Nakhon Ratchasima. It has been entitled as 1 of 9 National Research Universities of Thailand since 2009.Suranaree University of Technology is the first ever university in Thailand that initiated Trimester System for its educational management consisting of 13 weeks for each trimester providing enough time for students to concentrate on their study more effectively. It also enables the university to integrate cooperative education into every curriculum at an undergraduate level in which students can have hands-on experience at the workplace, full-time, and more time to enrich their practical knowledge and skills. It has recently been selected as an international satellite office of the World Association Cooperative Education .Suranaree University of Technology houses the National Synchrotron Research Center that enables advanced research on physics, materials science and related areas. The School of Physics has been ranked as the first in the country consecutively. In addition, the university has been recognized as one of the most productive institutions. It is the youngest institution among the nine National Research Universities of Thailand. Wikipedia.

A new method for improving fingerprint detections by a compression-based joint transform correlator (JTC) via wavelet filter is proposed. The simulation results show that the proposed method has advantages over the conventional compression-based JTC in that detection performance can be maximized to be higher than a classical JTC by using a smaller file size for the compressed-reference images. © 2010 Optical Society of America. Source

Widjaja J.,Suranaree University of Technology
Optics Communications

A new method for noisy face recognition by incorporating wavelet filter into compression-based joint transform correlator (JTC) is proposed. The simulation results show that the proposed method has advantages over the conventional compression-based JTC in that regardless of the contrast and the noise level of the target, the wavelet filter can optimize the recognition performance to be higher than the classical JTC, provided compressed references have high contrast. © 2011 Elsevier B.V. All rights reserved. Source

Flood A.E.,Suranaree University of Technology

This article analyzes a collection of recent research on a recently discovered feedback mechanism between the crystal growth rate and the surface features of the crystal, and the ramifications the mechanism has on crystallization in general and also on the design and analysis of industrial crystallizers. It has been found that growth under high supersaturations degrades the crystal surface, causing a roughening that is probably due to imperfect incorporation of growth clusters into the surface of the crystal. The effect becomes more pronounced under higher growth rate conditions, and for higher residence times under such conditions. The mechanism only occurs if the supersaturation is increased above a critical level known as the macroscopic roughening transition, although this level is typically quite low; for sucrose it has been measured as a relative supersaturation between 2.5 and 3.9% which is in the range used in many industrial crystallizations. The mechanism appears to be associated with the surface energy of the crystal, with the surface of high surface energy crystals being degraded at lower values of the supersaturation, and such crystals also have larger reductions in growth rate after the roughening has occurred. The mechanism also appears related to growth rate dispersion (GRD), since it gives a mechanism for variation in growth rates in batches of crystals, and also because GRD also appears to be more significant in species having a higher value of the surface energy. The mechanism also causes an increase in the impurity incorporation in the crystal, thus leading to reduced product crystal purities. The mechanism for the impurity incorporation is probably due to enhanced adsorption of impurity molecules due to large crystal surface areas (due to the roughening) and also larger numbers of adsorption sites. The mechanism also complicates measurement of crystal growth kinetics, and thus makes efficient design of industrial crystallization units more difficult. © The Royal Society of Chemistry. Source

Koonsrisuk A.,Suranaree University of Technology

Sloped solar chimney system is a solar chimney power plant with a sloped collector. Practically, the sloped collector can function as a chimney, then the chimney height can be reduced and the construction cost would be reduced also. A mathematical model based on the continuity, momentum, energy, and state equations is developed for the sloped solar chimney system in this study. The flow details inside a collector are included in the model. The mathematical model was solved numerically using an iterative technique. Then, the numerical simulation was performed using the commercial CFD package. The consistency of the predictions of the mathematical model and that of the CFD package justifies the validity of the proposed mathematical model. A detailed study of the plant characteristics is done. Results show that using a near-unity ratio of the collector inlet flow area and the collector exit flow area might cause some problems. In addition, the assumption that the density differences in the collector and that in the chimney are approximately equal is investigated. The study shows that this assumption provides a large overprediction of the results. The effects of the chimney height and the collector area on the plant performance are also illustrated. © 2012 Elsevier Ltd. Source

In the present paper the performance of solar chimney power plants based on second law analysis is investigated for various configurations. A comparison is made between the conventional solar chimney power plant (CSCPP) and the sloped solar chimney power plant (SSCPP). The appropriate entropy generation number and second-law efficiency for solar chimney power plants are proposed in this study. Results show that there is the optimum collector size that provides the minimum entropy generation and the maximum second-law efficiency. The second-law efficiency of both systems increases with the increasing of the system height. The study reveals the influence of various effects that change pressure and temperature of the systems. It was found that SSCPP is thermodynamically better than CSCPP for some configurations. The results obtained here are expected to provide information that will assist in improving the overall efficiency of the solar chimney power plant. © 2013 Elsevier Ltd. Source

Discover hidden collaborations