IOSR-JAP   Volume-5 ~ Issue-2 ~ Nov–Dec 2013

Paper Type	:	Research Paper
Title	:	Thermo-physical properties of selected oil samples as predictor of marine engines life span
Country	:	Nigeria
Authors	:	Evans, U. F., Okore, E. O & Edem, E.
	:	10.9790/4861-0520106
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Abstract: The break down of hydrodynamic regime of lubricants especially at higher operating temperature promotes direct metal-to-metal contact between surfaces. This often results in wear and tear, overheating and fatigue on the sliding surfaces of engines. This paper determines the actual viscosities of six oil samples (Mobil oil, Abro oil, Con oil, Tonimas oil, Oando oil and Total oil) using their coefficient of viscosities and specific heat capacities obtained in the laboratory. The results indicate that Mobil oil is the most appropriate for oil marine engines; closely followed by Tonimas oil, and Total oil. The results also reveal that Con Oil, Oando Oil and Abro Oil have low viscosities at higher temperatures. This thermo-physical property may render these oils very unstable for marine engines, especially for international voyage.

Key words: Hydrodynamic, lubricants, marine engine, viscosity, temperature and overheating.

[1] Fasina, O. O. & Colley, Z. Viscosity and specific heat of vegetable oils as a function of temperature. International Journal of Food Properties, 11(4), 2008. 738–746

[2] Bienkowski, K. Coolants and Lubricants: The Truth. Manufacturing Engineering. 1993.

[3] Smith D. "Oil's Well That Ends Well, Part 2", Sport Rider, 2009. retrieved 2013-03-20.

[4] Dmitri, K. Classification of Lubricating oil. Substance and Technology: Knowledge Source on Materials engineering. 2012.

[5] Schlosberg, R. H., Chu, J. W., Knudsen, G. A., Suciu, E. N. & Aldrich, H. S. High stability esters for synthetic lubricant applications, Lubrication Engineering, 2001. 21-26.

[6] Lawrence, M. All about motor oil. California Scientific. 2011. Retrieved 2013-03-20.

[7] JASO, Motorcycle Four Cycle Gasoline Engine Oil Application Manual. JASO Engine Oil Standards Implementation Panel. May 2011.

[8] Mihara, H., Ishiguro, T., Fukano, H., Taniuchi, S., & Ogino, K. Effect of crystallization temperature on its crystallization. IV. The influence of Tripalmitoglycerol (PPP) on the crystallization of 1,3-dipalmitoyl 2-oleoyl glycerol (POP) and 1, 2-dioleoyl-3-palmitoyl glycerol. Journal of Oleo Science. 56(5), 2007. 223-230.

[9] Eze, S.O., Alakali, J. S., Ngadi, M. O, Njoku P. C. & Ayuk A. A. Rheological properties of crude palm oil. International Reviews of Chemical Engineering 2(5), 2010. 598-605.

Paper Type	:	Research Paper
Title	:	X-Ray Line Profile Analysis of Chemically Deposited Nanostructured PBS Films
Country	:	India
Authors	:	Bhaskarjyoti Baruah, Lakhi Saikia, Mothura Nath Bora, Kanak Ch. Sarma
	:	10.9790/4861-0520713
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Abstract: Nanocrystalline films of PbS have been deposited on glass sustrates at room temperature by CBD method. The structural parameters of PbS films have been studied by X-ray line profile analysis using Williamson Hall and Modified Williamson Hall method. The crystallite sizes are found in between 4.99-53.9 nm, strain in the films in the range of 7.4x10-4 – 2.82 x 10-3 and dislocation densities are found to be very high ~ 1015-1016 m-2.

Keywords: Chemical Bath Deposition, Dislocation density, Dislocation contrast factor, MWH plot, WH plot

[1] I Ka, D Ma, M A El Khakani, J Nanopart Res 13(2011), 2269–2274

[2] T. L. Remadevi, K. C. Preetha, J Mater Sci: Mater Electron 23(2012), 2017–2023 [3] P.K. Nair, V.M. Garcia, A.B. Hernandez, M.T.S. Nair, J. Appl. Phys. 24(1991), 1466-1472

[4] M. A. Barote, A. A. Yadav T. V. Chavan E. U. Masumdar, Digest Journal of Nanomaterials and Biostructures, 6(2011), 979 – 990

[5] S. Kaci, A. Keffous, M. Trari, H. Menari, A. Manseri, B. Mahmoudi, L. Guerbous, Optics Communications, 283 (2010), 3355–3360

[6] R Devi, P Purkayastha, P K Kalita, B K Sarma, Bull. Mater. Sci., 30(2007), 123–128

[7] S. Kaci, A. Keffous, M. Trari, O. Fellahi, H. Menari, A. Manseri, L. Guerbous, Journal of Luminescence, 130 (2010), 1849–1856

[8] M.M. Abbas, A. Ab-M. Shehab, N-A. Hassan, A-K. Al-Samuraee, Thin Solid Films, 519 (2011), 4917–4922

[9] Diwaker Kumar, Garima Agarwal, Balram Tripathi, Devendra Vyas, Vaibhav Kulshrestha, Journal of Alloys and Compounds, 484 (2009), 463–466

[10] N. Choudhury, B.K. Sarma,Thin Solid Films, 519 (2011), 2132–2134

Paper Type	:	Research Paper
Title	:	Optical Studies on Eritrean Quartz
Country	:	Ethiopia
Authors	:	Taku Roop Krishen, Beraki Woldehaimanot, Chauvan Mukul
	:	10.9790/4861-0521418
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Abstract: A detailed geological history of quartz and industrial minerals present in different localities of Eritrea is given. Well-grown transparent quartz crystals reflecting the hexagonal crystallographic features and isolated, irregular shaped small milky quartz stones are found in western suburb of Asmara and the area between Molebso and Zara in central northern Eritrea. Mechanism of formation of growth features observed on the habit faces of transparent quartz crystals is briefly explained. Micro-topographical studies carried out on these crystals indicate that to begin with, they grow and develop under high supersaturating conditions. Most of the milky quartz stones are observed to be generally randomly scattered and devoid of gold. However, few such specimens having yellow colored dots on their surfaces contain gold particles. Energy dispersion of Xray analysis (EDAX) indicates high content of gold to the tune of 48% present in such samples. Commercial implications related to quartz bearing gold are discussed. It is proposed that gold exists in large quantity in quartz veins deep beneath the surface of earth in this region.

Keywords: Gold, Quartz, Crystal, Habit, EDAX.

[1] Beraki Woldehaimanot, Tectonic and geochemical characterization of volcanic and granitoids from the madobha belt, Northern Eritrea, J. Afri. Sciences. 30, 4,2000, 817-31

[2] John, Rakovan and A Jaszezak, Multiple length scale growth spirals on metamorphic graphite [001] surfaces studied by atomic force microscopy, Amer. Miner 87, 2002,17-24

[3] M.S.Joshi and P.N.Kotru, Role of micro crystals in the growth and Development of Prism faces of cultured quartz, Kristall und Technik, 12,1, 1977,13-25

[4] M.S.Joshi and B.K. Paul, Surface structures of trigonal bipyramidal faces of natural quartz, Amer.Miner, 62, 1977, 122-126

[5] P.N.Kotru, On the Dissolution of Grown Synthetic quartz inside autoclaves, Kristall und Technik,13,1, 1978,35-41

[6] P.N.Kotru, S.K.Kachroo, and K.K.Raina, Twinning in Hydrothermally grown quartz as revealed by etch structures, Crystal. Res. and Technol, 20, 1, 1985, 27-37

[7] I, Sunagawa, Characterization of crystal surfaces by optical microscopy, Fortschr. Miner, 52, 1975,515

[8] I, Sunagawa, Crystal Growth and Characterization, Proc.ISSCG-2, Spring School Japan, Oxford, 1975,347

[9] R. K.Takoo, Mechanism of various Growth Morphologies of Kutch quartz crystals, Cryst, Res, Technol,21,1,1986,145-150

[10] M.S.Joshi and R.K Taku, Development of (120) faces of natural topaz, Amer.Miner. 57,1972, 1884-89