81 research outputs found
A Linear Antenna Array Failure Correction with Null Steering using Firefly Algorithm
No full textThe element failure of digital beam forming array antenna systems used in defence equipment increases the side lobe power level which distorts the beam pattern of the antenna array. The problem of array failure correction becomes more complex when null steering conditions are required to be added. In this paper, the problem of linear antenna array failure has been addressed with multiple wide band null steering using firefly algorithm (FA) by controlling the amplitude and phase excitation of array elements. A fitness function in the form of template has been formulated to obtain the error between original (pre-failed) side lobe pattern and measured side lobe pattern and this error function has been minimized using FA. Numerical example of element failure correction of element failure of array along with multiple nulls is presented to show the capability of this flexible approach.Defence Science Journal, 2014, 64(2), pp. 136-142. DOI: http://dx.doi.org/10.14429/dsj.64.425
Adsorption study of N (-benzo[d]thiazol-2-yl)-1-(thiophene-2-yl) methanimine at mild steel/aqueous H2SO4 interface
No full textThis study reports microwave (MW) assisted synthesis of N (-benzo[d]thiazol-2-yl)-1-(thiophene-2-yl) methanimine (BTTM) in reasonably good yield and purity. The synthesized compound (BTTM) has been characterized by elemental analysis, IR and 1H NMR spectroscopy and examined for its corrosion inhibition activity for mild steel in aqueous H2SO4 medium using gravimetric and different electrochemical methods. The corrosion inhibition study was also performed at different temperatures to understand the effect of temperature on corrosion inhibiting potential of BTTM. The metal protecting ability of BTTM in acid solution was further examined by surface analyses; X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and contact angle measurement. The surface analyses reveal that the BTTM adsorbed on mild steel (MS) surface following ElAwady isotherm. Theoretical studies, viz. molecular orbital analysis and molecular dynamic (MD) modelling were also conducted to understand the inhibition mechanism completely.King Khalid University [11/1-349/2022/FIN -B/]; [R.G.P.2/224/43]Authors are thankful to their Institutions for providing platform to carry out this work. We are also thankful to our friends and colleagues who assisted this research work directly or indirectly. Author Manjeet Singh acknowledges the financial support received in the form of Research Promotion Grant MZU (11/1-349/2022/FIN -B/) to provide his contribution in this research. Authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding theoretical work of this study through research group under grant number R.G.P.2/224/43
Estimates of Genetic Parameters of First Lactation Traits in Crossbreed Hardhenu (Bos Taurus X Bos Indicus) Cattle
No full textEffect of Hydrological Properties on the Energy Shares of Reflected Waves at the Surface of a Partially Saturated Porous Solid
No full textCivil-Military Relations and Military Effectiveness in India
No full textThis chapter looks into India's civil-military relations and its impact on India's military effectiveness. It discusses the theory of civil-military relations and identifies that while Huntington's 'bjective control' best describes civil-military relations in India, it does not, contrary to Huntington's claim, maximize military effectiveness. Borrowing from Risa Brook's approach, the author analyses Indian military effectiveness by examining its four crucial determinants-weapons procurement, defence planning, integration and human resource development. He argues that the current structure of civil-military relations, more accurately described as an 'absent dialogue', has an adverse impact on its military effectiveness. While the Indian state has acknowledged some of these problems and has made some attempts at defence reforms, more forceful political intervention is required.</p
Plant Maturity in relation to Plant Development in Sorghum bicolor effected by charcoal rot
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