2013
37
2
2
99
Korovkin type aproximation theorem through
statistical lacunary summability
2
2
Korovkin type approximation theorems are useful tools to check whether a given sequence of positive linear operators on of all continuous functions on the real interval is an approximation process. That is, these theorems exhibit a variety of test functions which assure that the approximation property holds on the whole space if it holds for them. Such a property was discovered by Korovkin in 1953 for the functions and in the space as well as for the functions 1, cos and sin in the space of all continuous 2πperiodic functions on the real line. In this paper, we use the notion of statistical lacunary summability to improve the result of [Ann. Univ. Ferrara, 57(2) (2011) 373381] by using the test functions in place of and We apply the classical Baskakov operator to construct an example in support of our main result.
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99
102


M.
Mursaleen
Department of Mathematics, Aligarh Muslim University, Aligarh 202002, India
Department of Mathematics, Aligarh Muslim
India


R.
Ahmad
Department of Mathematics, Aligarh Muslim University, Aligarh 202002, India
Department of Mathematics, Aligarh Muslim
India
Statistical convergence
statistical lacunary summability
positive linear operator
Korovkin type approximation theorem
[[1] Fridy, J. A. (1985). On statistical convergence. Analysis, 5, 301313. ##[2] Fridy, J. A. & Orhan, C. (1993). Lacunary statistical convergence. Pacific J. Math., 160, 4351. ##[3] Mursaleen, M. & Alotaibi, A. (2011). Statistical lacunary summability and a Korovkin type approximation theorem. Ann. Univ. Ferrara, 57(2), 373381. ##[4] Korovkin, P. P. (1953). Convergence of linear positive operators in the spaces of continuous functions (Russian). Doklady Akad. Nauk. SSSR (N.S.). 90, 961964. ##[5] Korovkin, P. P. (1960). Linear Operators and Approximation Theory. Delhi. Hindustan Publ. Corp. ##[6] Anastassiou, G. A., Mursaleen, M. & Mohiuddine, S. A. (2011). Some approximation theorems for functions of two variables through almost convergence of double sequences. Jour. Comput. Analy. Appl., 13(1), 3740. ##[7] Mohiuddine, S. A. (2011). An application of almost convergence in approximation theorems. Appl. Math. Lett., 24, 18561860. ##[8] Patterson, R. & Savas, E. (2005). Korovkin and Weierstass approximation via lacunary statistical sequences. J. Math. Stat., 1(2), 165167. ##[9] Edely, O. H. H., Mohiuddine, S. A. & Noman, A. K. (2010). Korovkin type approximation theorems obtained through generalized statistical convergence. Appl. Math. Lett., 23, 13821387. ##[10] Mursaleen, M. & Alotaibi, A. (2011). Statistical summability and approximation by de la Vall ePoussin mean. Appl. Math. Lett., 24, 320324. ##[11] Mursaleen, M., Karakaya, V., Ert rk, M. & G rsoy, F. (2012). Weighted statistical convergence and its application to Korovkin type approximation theorem. Appl. Math. Comput., 218, 91329137. ##[12] Srivastava, H. M., Mursaleen, M. & Khan, A. (2012). Generalized equistatistical convergence of positive linear operators and associated approximation theorems. Math. Comput. Modelling, 55, 20402051. ##[13] Belen, C., Mursaleen, M. & Yildirim, M. (2012). Statistical Asummability of double sequences and a Korovkin type approximation theorem. Bull. Korean Math. Soc., 49(4), 851861. ##[14] Mursaleen, M. & Alotaibi, A. (2012). Korovkin type approximation theorem for functions of two variables through statistical Asummability. Adv. Difference Equ., 2012:65, doi:10.1186/16871847201265. ##[15] Boyanov, B. D. & Veselinov, V. M. (1970). A note on the approximation of functions in an infinite interval by linear positive operators. Bull. Math. Soc. Sci. Math. Roum., 14(62) 913. ##[16] Becker, M. (1978). Global approximation theorems for SzaszMirakjan and Baskakov operators in polynomial weight spaces. Indiana Univ. Math. J., 27(1), 127142. ##[17] Srivastava, H. M., Mursaleen, M. & Khan, A. (2012). Generalized equistatistical convergence of positive linear operators and associated approximation theorems, Math. Comput. Modelling, 55, 20402051. ##[18] Mohiuddine, S. A., Alotaibi, A. & Mursaleen, M. (2012). Statistical summability (C; 1) and a Korovkin type approximation theorem. Jour. Ineq. Appl., 2012:172, doi:10.1186/1029242X2012172. ##[19] Mursaleen, M. & Alotaibi, A. (2013). Korovkin type approximation theorem for statistical Asummability of double sequences. Jour. Comput. Anal. Appl., 15(6), 10361045. ##[20] Mursaleen, M. & Kilicman, A. (2013). Korovkin second theorem via Bstatistical Asummability, Abstract Appl. Anal., Volume 2013, Article ID 598963, 6 pages, doi:10.1155/2013/598963. ##[21] Edely, O. H. H., Mursaleen, M. & Khan, A. (2013). Approximation for periodic functions via weighted statistical convergence. Appl. Math. Comput., 219, 82318236.##]
On fuzzy subhyperspaces of hypervector spaces
2
2
The purpose of this paper is the study of subhyperspaces of a hypervector space investigating some of their properties. In this regard, the notion of a normal fuzzy subhyperspace of hypervector space is introduced. Using it, we construct new fuzzy subhyperspaces. We also show that, under certain conditions, a fuzzy subhyperspace of a hypervector space is twovalued and takes the values 0 and 1.
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103
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K.
Hila
Department of Mathematics & Computer Science, Faculty of
Natural SciencesUniversity of Gjirokastra, Albania
Department of Mathematics & Computer
Albania


K.
Naka
Department of Mathematics & Computer Science, Faculty of
Natural SciencesUniversity of Gjirokastra, Albania
Department of Mathematics & Computer
Albania
Hypervector space
subhyperspace
fuzzy hypervector space
normal fuzzy subhyperspace
[[1] Marty, F. (1934). Sur une generalization de la notion de group, in Proceedings of the 8th Congress Math. Scandinaves (1934). Stockholm, Sweden. ##[2] Corsini, P. (1993). Prolegomena of hypergroup theory. Italy: Aviani editor, Udine, 2nd edition, 1993. ##[3] Scafati Tallini, M. (1988). hypermodules and hypervector spaces. (Italian) Riv. Mat. Pura Appl., 3, 3948. ##[4] Zadeh, L. A. (1965). Fuzzy sets. Information and Control, 8(3), 338353. ##[5] Rosenfeld, A. (1971). Fuzzy groups. J. Math. Anal. Appl., 35(3), 512517. ##[6] Corsini, P. & Leoreanu, V. (2003). Applications of hyperstructure theory. Advances in Mathematics, The Netherlands: Kluwer Academic Publishers, Dordrecht 2003. ##[7] Nanda, S. (1991). Fuzzy linear spaces over valued fields. Fuzzy Sets and Systems, 42(3), 351354. ##[8] Katsaras, A. K. & Liu, D. B. (1977). Fuzzy vector spaces and fuzzy topological vector spaces. J. Math. Anal. Appl., 58(1), 135146. ##[9] Kumar, R. (1992). Fuzzy vector spaces and fuzzy cosets. Fuzzy Sets and Systems, 45, 109116. ##[10] Kumar, R. (1993). On the dimension of a fuzzy subspace. Fuzzy Sets and Systems, 54, 229234. ##[11] Lubczonok, P. (1990). Fuzzy vector spaces. Fuzzy Sets and Systems, 38, 329343. ##[12] Lubczonok, P. & Murali, V. (2002). On flags and fuzzy subspaces of vector spaces. Fuzzy Sets and Systems, 125, 201207. ##[13] Nanda, S. (1986). Fuzzy fields and fuzzy linear spaces. Fuzzy Sets and Systems, 19, 8994. ##[14] Hedayati, H. (1984). On properties of fuzzy subspaces of vector spaces. Ratio Mathematica, 19, 110. ##[15] Ameri, R.(2005). Fuzzy Hypervector Spaces over Valued Fields. Iranian Journal of Fuzzy Systems, 2, 3747. ##[16] Ameri, R. & Dehghan, O. R. (2010). Fuzzy basis of fuzzy hypervector spaces. Iranian Journal of Fuzzy Systems 7(3), 97113. ##[17] Ameri, R. & Dehghan, O. R. (2011). Fuzzy hypervector spaces based on fuzzy singletons. Computers and Mathematics with Applications, 61(10), 29332943. ##[18] Ameri, R. & Dehghan, O. R. (2008). Fuzzy Hypervector Spaces. Advances in Fuzzy Systems, Vol. 2008, Article ID 295649, 9 pages. ##[19] Ameri, R. (2002). Fuzzy (Co)norm hypervector spaces, in Proceedings of the 8th International Congress in Algebraic Hyperstructures and Applications (7179). Greece: Samotraki, September 2002. ##[20] Ameri, R. & Zahedi, M. M. (1997). Hypergroup and join spaces induced by a fuzzy subset. Pure Mathematics and Applications, 8, 155168. ##[21] Ameri, R. & Zahedi, M. M. (1996). Fuzzy subhypermodules over fuzzy hyperrings, in Proceedings of the 6th International Congress in Algebraic Hyperstructures and Applications (114). Prague, Czech Republic: Democritus University, September 1996. ##[22] Ameri, R. & Dehghan, O. R. (2008). On Dimension of Hypervector Spaces. European Journal of Pure and Applied Mathematics, 1(2), 3250. ##[23] Davvaz, B. (2001). Fuzzy submodules. Fuzzy Sets and Systems, 117(3), 477484. ##[24] Davvaz, B. (1999). Fuzzy groups. Fuzzy Sets and Systems, 101(1), 191195. ##[25] Corsini, P. & Leoreanu, V. (2002). Fuzzy sets and join spaces associated with rough sets. Rendiconti del Circolo Matematico di Palermo 51(3), 527536. ##[26] Corsini, P. & Tofan, I. (1997). On fuzzy hypergroups. Pure Mathematics and Applications, 8(1), 2937. ##[27] Scafati Tallini, M. (1990). Hypervector Spaces, Proceedings of the Fourth International Congress on Algebraic Hyperstructures and Applications, Xanthi, Greece (167174). ##[28] Scafati Tallini, M. (1991). Matroidal Hypervector Spaces. Journal of Geometry, 42, 132140. ##[29] Scafati Tallini, M. (1994). Weak Hypervector Spaces and Norms in such Spaces, Proceedings of the Fifth International Congress on Algebraic Hyperstructures and Applications, Jasi, Rumania: Hadronic Press, Florida, USA: Palm Harbor (199206). ##[30] Scafati Tallini, M. (2003). Characterization of remarkable hypervector spaces, Proceedings of the 8th International Congress on Algebraic Hyperstructures and Applications, Samothraki, Greece, September 19, 2002. Xanthi: Spanidis Press. (231237). ##[31] Scafati Tallini, M. (1991). Spazi ipervettoriali fortemente distributivi a sinistra. Rend, Mat. Univ. Roma, (VII) 11, 116. ##[32] Scafati Tallini, M. (1993). La categoria degli spazi ipervettoriali. Quaderno Sem Mat. Univ: Roma, no (110), 117. ##[33] Scafati Tallini, M. (1993). Spazi ipervettoriali deboli e norme in tali spazi. Quaderno Sem Mat. Univ: Roma, 117. ##[34] Scafati Tallini, M. (1994). La categoria degli spazi ipervettoriali. Rivista di Mat. Pura e Applicata, Univ. Udine, 15, 97109. ##[35] Scafati Tallini, M. (1996). Strutture algebriche multivoche e strutture geometriche. Quaderno Sem. Mat. Univ. Roma, 123. ##[36] Scafati Tallini, M. (1996). Sottospazi, spazi quozienti, omomorfismi tra spazi ipervettoriali. Rivista di Mat. Pura e Applicata Univ. Udine, 18, 7184. ##[37] Vougiuklis, T. (1994). HvVector Spaces, Proceedings of the Fifth International Congress on Algebraic Hyperstructures and Applications, Jasi, Rumania: Hadronic Press, Florida, USA: Palm Harbor (181190).##]
Soliton solutions to a few coupled nonlinear
wave equations by tanh method
2
2
In this paper, tanh method is applied to obtain exact solutions for two systems of nonlinear wave equations, namely, two component evolutionary system of homogeneous KdV equations of order 3 (type I as well as type II). Moreover, traveling wave hypothesis is used to obtain sech solution of type II coupled KdV system, in a more general setting. The results show that this method presents exact solutions compared with other methods and it is a powerful tool for solving systems of nonlinear PDEs.
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109
115


A. J. M.
Jawad
Computer Engineering Department, AlRafidian University College, 00964 Baghdad, Iraq
Computer Engineering Department, AlRafidian
Iraq


M. D.
Petkovic
University of Niš, Faculty of Science and Mathematics Department of
Computer Science Višegradska 33, 18000 Niš, Serbia
University of Niš, Faculty of Science
Serbia


A.
Biswas
Department of Mathematical Sciences Delaware State University, Dover, DE 199012277, USA
Department of Mathematical Sciences Delaware
United States
Tanh method
nonlinear system of PDES
exact Solutions
Characterizations of semigroups by the properties
of their fuzzy ideals
2
2
Generalizing the notions of fuzzy left (right) ideal, fuzzy quasiideal, and fuzzy biideal, the notions of fuzzy left (right) ideal, fuzzy quasiideal and fuzzy biideal of semigroups are defined. Regular, intra regular and semisimple semigroups are characterized by the properties of these fuzzy ideals.
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117
131


M.
Shabir
Department of Mathematics, QuaidiAzam University, Islamabad, Pakistan
Department of Mathematics, QuaidiAzam University
Pakistan


M.
Ali
Department of Mathematics, QuaidiAzam University, Islamabad, Pakistan
Department of Mathematics, QuaidiAzam University
Pakistan
fuzzy ideal
fuzzy quasiideal
fuzzy biideal
regular semigroups
intra regular semigroups
semisimple semigroups
Coupled Nstructures and its application in BCK/BCIalgebras
2
2
Coupled Nstructures are introduced, and its application is discussed in BCK/BCI algebras. The notions of a coupled Nsubalgerba, a coupled Nideal and a coupled NC ideal are introduced, and their relations are investigated. Characterizations of a coupled Nideal and a coupled NCideal are discussed. Conditions for a coupled Nsubalgerba to be a coupled Nideal are considered.
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133
140


Y.
Bae Jun
Department of Mathematics Education, Gyeongsang ational University, Jinju(=Chinju) 660701, Korea
Department of Mathematics Education, Gyeongsang
Korea


Shin Ahn
S.
Department of Mathematics Education, Dongguk University, Seoul 100715, Korea
Department of Mathematics Education, Dongguk
Korea


D. R.
Prince Williams
Department of Information Technology, College of Applied Sciences,
Post Box: 135, Sohar311, Sultanate of Oman
Department of Information Technology, College
Oman
Coupled Nstructure
coupled Nsubalgerba
coupled Nideal
coupled NC ideal
Analyzing land cover changes of Osmancik (Corum, Turkey)
basin with landsat TM images
2
2
This research involves land cover changes of Osmancik Basin. The basin, is located in the northern part of Turkey, between 40o 48’  41o 40’ north latitudes and 34o 41’  35o 04’ east longitudes. The aim of this study is to research the permanent effects of human activities on natural land cover change. For this purpose, satellite images which enclose 1987  2010 periods are used as data. Erdas Imagine 10.0 software was used to analyse these images by using data images (Landsat TM) processing techniques. Land cover change nomenclature is made due to Corine (Coordination of Information on the Environment) Class 2 (Urban fabric, Forest, Shrub and/or herbaceous vegetation association, Heterogeneous areas, Inlands wetlands) and Class 3 (Rice fields). All images were independently classified using the supervised classification method of maximum likelihood algorithm. As a result, a period of over 20 years deforestation was calculated 62 % from 66663, 1 to 25266, 2 hectares between 1987 and 2010. In the same period, urban fabric changing was observed 190 % from 1949, 8 to 5671, 8 hectares. On the contrary, Inland wetlands have increased from 429, 4 to 1641, 6 hectares because of the built up new big dam named Obruk.
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141
146


A.
Karatepe
Sakarya University, Faculty of Arts and Sciences, Department of Geography,
Esentepe Campus, Serdivan, 54187 Sakarya, Turkey
Sakarya University, Faculty of Arts and Sciences,
Turkey


C.
Ikiel
Sakarya University, Faculty of Arts and Sciences, Department of Geography,
Esentepe Campus, Serdivan, 54187 Sakarya, Turkey
Sakarya University, Faculty of Arts and Sciences,
Turkey
Land cover change
Corine
Landsat TM
remote sensing (RS)
Osmancik Basin
Geochemical characterization and petrogenesis of NiatJal
amphibolites, southeast Kohistan, Pakistan
2
2
The Kamila Amphibolite Unit (KAU) of southeast Kohistan, Pakistan, represents a thick sequence of metavolcanics which is underlined by the maficultramafic rocks of the Spat Complex along the MMT (Main Mantle Thrust). The metavolcanics of KAU are intruded by diorites, granitoids and tronjhemites of the Thak intusive complex. KAU is subdivided into four distinct units; Babusar, Niat and Jal amphibolites from south to north with a thin slice of Sumal amphibolites within NiatJal amphibolites. Niat and Jal amphibolites generally show strong foliation and alternating bands of mafic and felsic compositions. Niat amphibolites are generally fine to medium grained and composed of amphibole (hornblende and actinolite) and substantial quartz with subordinate plagioclase, epidote and chlorite. Magnetite, sphene, muscovite, and apatite occur as accessory minerals. The Jal amphibolites are fine grained and melanocratic and generally comprised of hornblende and plagioclase with subordinate quartz and sericite. Epidote and sphene occur as accessory minerals. Twenty six samples from both groups have been analyzed for whole rock geochemistry. The studied amphibolites fall in tholeiite group and show enrichment in HFS elements and depletion in LIL elements. Spider diagrams and MgO versus Zr plot show heterogeneous compositional patterns, with three distinct patterns: primitive, less evolved and more evolved. Average concentration of TiO2 (1.99 wt% for Niat amphibolites and 1.56 wt% for Jal amphibolites) and K2O (0.14 wt% for Niat amphibolites and 0.20 wt% for Jal amphibolites) exhibit MORB like composition whereas average Y/Nb ratio (8.9 for Niat amphibolites and 8.4 for Jal amphibolites) are close to NMORB. Zr/Y vs Zr plot characterized the studied rocks as MORB and they fall in the ocean floor basalt (OFB) field on the triangular Ti/100, Zr, Y*3 diagram.
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147
159


M.
Ahmed Khan
Continental Laboratories Ltd.3601A, 21st Street NE, Calgary, Canada
Continental Laboratories Ltd.3601A, 21st
Pakistan


S. U.
Rehman
Department of Earth Sciences, University of Sargodha, Sargodha, 41000, Pakistan
Department of Earth Sciences, University
Pakistan


K.
Mehmood
Department of Earth Sciences, University of Sargodha, Sargodha, 41000, Pakistan
Department of Earth Sciences, University
Pakistan


M.
Asif Khan
NCE Geology, Peshawar University, Peshawar, Pakistan
NCE Geology, Peshawar University, Peshawar,
Pakistan


N.
Ahsan
Institute of Geology, University of Punjab, Lahore
Institute of Geology, University of Punjab,
Pakistan
Kohistan island arc
Kamila amphibolites unit
Niat aphibolites
Jal amphibolites
Effect of ±5ºC difference from physiologic temperature on surface area, volume, and surfacetovolume ratio of transformed cells
2
2
Information on the relationship between culture temperature and changes in the cell's area, volume and area to volume (S/V) ratio is lacking. Cancerous epitheliallike cell lines SW480, SW742 and T47D were cultured at 32, 37 and 42°C for 48hr. Digital images of cells were analyzed using software Imaged. Observed surface area, volume changes, and surface area to volume (S/V) ratio were significantly different at 32, 37 and 42°C in the three celllines tested (P<0.05). S/V ratios for all three cell lines at 37°C were significantly greater than that of at 42°C (P=0.0001).
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161
164


M.
RezaeiTavirani
Proteomics Research Center, Faculty of Paramedical Sciences, Shahid Beheshti
University of Medical Sciences, Tehran, Iran
Proteomics Research Center, Faculty of Paramedical
Iran


s.
Kalantari1
Proteomics Research Center, Faculty of Paramedical Sciences, Shahid Beheshti
University of Medical Sciences, Tehran, Iran
Proteomics Research Center, Faculty of Paramedical
Iran


S.
Hessami Tackallou
Department of Biology, Islamic Azad University, Garmsar Branch, Garmsar, Iran
Department of Biology, Islamic Azad University,
Iran


R.
Rastmanesh
Human Nutrition Department, Faculty of Nutrition, Shahid Beheshti
University of Medical Sciences, Tehran, Iran
Human Nutrition Department, Faculty of Nutrition,
Iran
Structure of spin polarized strange quark star in the
presence of magnetic field at finite temperature
2
2
In this paper, the thermodynamic properties of spin polarized strange quark matter at finite temperature in the presence of a strong magnetic field using MIT bag model have been calculated. We have also computed the equation of state of spin polarized strange quark matter in the presence of strong magnetic field and finally, using this equation of state, the structure of spin polarized strange quark star at different temperatures and magnetic fields has been investigated.
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165
171


G. H.
Bordbar
Department of Physics, Shiraz University, Shiraz 71454, Iran
Department of Physics, Shiraz University,
Iran


F.
Kayanikhoo
Department of Physics, Shiraz University, Shiraz 71454, Iran
Department of Physics, Shiraz University,
Iran


H.
Bahri
Department of Physics, Shiraz University, Shiraz 71454, Iran
Department of Physics, Shiraz University,
Iran
Quark matter
quark star
structure
finite temperature
Isolation and characterization of a heavy metal resistant
Comamonas sp. from industrial effluents
2
2
In this study, eight bacterial isolates showing a suitable resistance to heavy metals were obtained from electroplating effluents. The isolates were grown on nutrient agar including 1 mM of each heavy metal of cobalt (Co), chromium (Cr), mercury (Hg), zinc (Zn) and copper (Cu). The minimum inhibitory concentrations (MICs) of the isolates were determined using different concentrations of heavy metals (15 mM) by broth dilution method. One of the isolates showed higher MICs of 5, 5, 4, 3 and 3 mM when grown on Co, Cr, Hg, Zn and Cu, respectively and selected for further study. The bacterial identity was determined by various biochemical and physiological experiments. The optimum temperature and pH for the growth of the strain were 30˚C and 7, respectively. The isolate was resistant to ampicillin, cephalotin, amikacin and gentamicin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate belongs to the genus Comamonas with 99% similarity to Comamonas testosteroni; it was then designated as Comamonas sp. HM_AF12. Atomic absorption spectrometer analysis showed that 80% of chromium was removed from 5 mg/L of chromium solution after 1 h. The results suggest that Comamonas sp. HM_AF12 obtained from effluent owing to its high resistance to toxic heavy metals has great potential to be employed for bioremediation of chromium contaminated effluents.
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173
179


M.
Ghane
Department of Biology, Faculty of Science, Islamic Azad University Islamshahr Branch, Islamshahr, Iran
Department of Biology, Faculty of Science,
Iran


F.
Tabandeh
Department of Industrial and Environmental Biotechnology, National Institute of
Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
Department of Industrial and Environmental
Iran


M.
Bandehpour
Faculty of Medical Sciences, Cellular& Molecullar Research Center, Shahid Beheshti University, Iran
Faculty of Medical Sciences, Cellular&
Iran


Mo.
Ghane
Department of Chemistry, Faculty of Science, Islamic Azad University Islamshahr Branch, Islamshahr, Iran
Department of Chemistry, Faculty of Science,
Iran
heavy metals
Comamonas
multiple resistances
industrial effluent
bioremediation
An investigation on effects of annealing on magnetic properties of NiFeWS electrodeposited coatings in tri sodium citrate bath
2
2
In the present investigation electrodeposited NiFeWS nano crystalline thin films were prepared in tri sodium citrate bath at bath temperature of 40˚C. Annealing of the electro deposited thin film was performed at 200˚ C temperature for one hour. Xray diffraction technique (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Xray spectroscopy (EDAX), Vickers Hardness Test (VHN), and Vibrating Sample Magnetometer (VSM) were utilized to study the asdeposited and annealing effects on the structural and magnetic properties of the film. Xray diffraction (XRD) result indicated that the asdeposited film had crystalline size of 31 nm. Annealing treatment of the coatings produced the enhanced crystalline size of 26.6 nm. Due to the improvement of soft magnetic properties in the 200˚C annealed film, the saturation magnetization is enhanced by 88 × 103 emu/ cm2 (coercivity decreased to 14.6 Oe) compared with the case of asdeposited film at bath temperature of 40˚C. The magnetic flux density (Bs) of the annealed film was enhanced by 0.6328 Tesla. Hardness of the annealed film increased from 143 VHN to 151 VHN. This shows that the soft magnetic properties of NiFeWS thin films are greatly enhanced by annealing at 200˚C which can be used in MEMS applications.
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181
187


R.
Kannan
Department of Physics, KSR College of Engineering, Tiruchengode637215, Tamil Nadu, India
Department of Physics, KSR College of Engineering,
India
rkannan80@gmail.com


S.
Ganesan
Department of Physics, Government College of Technology, Coimbatore641001, Tamil Nadu, India
Department of Physics, Government College
India


T. M.
Selvakumari
Department of Physics, Angel College of Engineering & Technology, Tirupur641665, Tamil Nadu, India
Department of Physics, Angel College of Engineerin
India
Tri sodium citrate
coating
annealing treatment
soft magnetic properties and hardness
Stable isotopes geochemistry of the bauxite horizons
in the Dehdasht area, southwest Iran
2
2
The karstbauxite deposits of the Dehdasht region in the southwest of Iran, are situated unconformably between Cenomanian and Santonian shallow marine limestones. The white, gray, black, pisolitic, red and yellow bauxites are the main horizons in these deposits from bottom to top. In this study, the combinations of oxygen, hydrogen, carbon and sulfur isotopes of the main bauxite units were utilized to trace bauxitization processes, climatic and environmental conditions. The δ18O and δD values of boehmite and kaolinite minerals, not only suggest a likely inheritance relation between them, but also suggests no remarkable climate changes during occurrence of bauxite horizons in Cretaceous. The δ18O values of about 7 ‰ and 8 ‰ inferred for the waters at the time of kaolinite crystallization and achieved kaolinization paleotemperature more than 30˚C, represent low paleolatitude location of the study area during the Cretaceous. The negative δ13C values from the carbonate matrix of bauxitebearing minerals, as low as 25 ‰, indicate carbon derivation from the biodegradation of organic matter under aerobic and anaerobic conditions. The positive δ34S values of pyrites reveale sulfatelimiting conditionduring diagenesis that is consistent with biological fractionation of sulfur in a closed system by sulfatereducing bacteria.
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189
197


A.
Zarasvandi
Department of Geology, Shahid Chamran University (SCU), Ahvaz, Iran
Department of Geology, Shahid Chamran University
Iran


A.
Foroughinia
Department of Geology, Shahid Chamran University (SCU), Ahvaz, Iran
Department of Geology, Shahid Chamran University
Iran


H.
Pourkaseb
Department of Geology, Shahid Chamran University (SCU), Ahvaz, Iran
Department of Geology, Shahid Chamran University
Iran


A.
Charchi
Department of Geology, Shahid Chamran University (SCU), Ahvaz, Iran
Department of Geology, Shahid Chamran University
Iran
Bauxite
stable isotope
climate
sulfatereducing bacteria
Dehdasht
Iran