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Latha, A.
- Performance Analysis on Modeling of Loop Heat Pipes Using Artificial Neural Networks
Authors
1 JNTUH College of Engineering, Hyderabad-500 085, IN
2 Infotech Enterprises Ltd., Hyderabad,500 081, IN
Source
Indian Journal of Science and Technology, Vol 3, No 4 (2010), Pagination: 463-467Abstract
The absence of mechanical moving parts, simplicity and robustness of loop heat pipes (LHPs) has prompted many satellite manufacturers to employ LHPs as primary thermal control systems. The acknowledgement of temperature dynamics of LHP plays a vital role in conception, optimization and control of the same. The overall thermal conductance varies not only with the power input, sink temperature and ambient conditions, but also with the previous history of its operation. In this connection, the present work is focused on a different approach for modeling LHPs. Experimental data for a vertical loop heat pipe made of copper, with two different working fluids, viz., water and ethanol for a range of heat inputs and fill ratios is collected from the literature. An artificial neural network (ANN) is trained with the collected test data and validated. Fully connected feed forward multilayer configuration (MLFFN) with momentum back propagation algorithm is adopted for the ANN. The MLFFN architecture consists of two input nodes representing the parameters heat input and fill ratio, and a single output node representing the thermal resistance of the LHP. The MLFFN predictions were validated within the domain of total available experimental data. This study also emphasizes that the understanding of the physical phenomena of LHP to be modeled by ANN is a prerequisite for getting acceptable results. As there is a serious limitation of conventional techniques for understanding the LHP physical phenomena and thermal behaviour, ANN approach appears to be very promising, if sufficient experimental data is available covering the entire range of system operation.Keywords
Loop Heat Pipes, Artificial Neural Network, ModellingReferences
- Khandekar S, Dollinger N and Groll M (2003) Understanding operational regimes of closed loop pulsating heat pipes: an experimental study. Appl. Therm. Engg. 23, 707-719.
- Riehel (2004) Characteristics of an open loop pulsating heat pipe. National Institute for Space Research. 2004-01-2509.
- Sen M and Yang KT (2000) Application of artificial neural networks and genetic algorithms in thermal engineering, CRC handbook of thermal engineering, pp: 620-661.
- Geochronology and Petrochemistry of the Dubha Granite, Sonbhadra District, Uttar Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Shillong- 793 01 1, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 4 (2005), Pagination: 459-467Abstract
The Rb-Sr isotopic systematics and petrochemistry of Dubha Granite occurring in the migmatite complex of Chhotanagpur Granite Gneiss Complex (CGGC) in parts of Sonbhadra district, Uttar Pradesh have been investigated.The Rb-Sr data on the whole rock samples (n=13) yields an isochron age of 17545±166 Ma with initial 87Sr/86Sr ratio of 0.7043±0.011.
The Dubha Granite is composed of quartz (34.2%), K-feldspar (37.4%), plagioclase (An2-40) (16.1%), biotite (9.6%), hornblende (1.9%), and accessory garnet, sphene, apatite, zircon, anatase, ilrnenite, magnetite, goethite, and chalcopyrite (0.8%). It is an anorogenic, metaluminous, ilmenite series, rift related granite, enriched in Ni, Cr, Co, V, Zn, Cu, Rb, Ba, Zr, Nb, Ce, U, Th and depleted in Sr and Y as compared to the normal granite. The Dubha Granites may have been generated by the anatexis of lower crustal material in the vicinity Son Narmada South Fault (SNSF).
Keywords
Geochronology, Petrochemistry, Dubha Granite, Sonbhadra, Uttar Pradesh.- Reinforcement of Communication Through Unconventional Methods of Advertising
Authors
1 KCT Business School, IN
Source
Data Mining and Knowledge Engineering, Vol 6, No 5 (2014), Pagination: 186-188Abstract
It is understood from the survey results that the average person is exposed to 3000 advertising message throughout the day when he is watching the television, reading the news paper, browsing the website & especially when he/she is in travelling, exposed to numerous advertising messages which ultimately leads confusion and reduced the brand recall. Hence now organizations are keen in finding innovative ways to gain the customer attraction in promoting their products & services.Unconventional methods of marketing have its own contribution in gaining the people attraction. The best ways of advertising a brand cause consumers to think about the brand while they are seeing the ad as well as thinking about it later.
Keywords
Unconventional Advertising, Promotion, Brand.- First Reported Occurrence of Igneous Activity in Palnad Basin:Evidence from Venkataramapuram, Nalgonda District, Telangana, India
Authors
1 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad-500016, IN
2 Regional Centre for Exploration and Research, AMD, Civil Lines, Nagpur-440001, IN