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RISS 인기검색어
- 검색키워드
- 저자 : O.S. Panwar (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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On Strongly Irresolute Mappings
Chae,GyuIhn,K.K. Dube,O.S. Panwar 울산대학교 1985 연구논문집 Vol.16 No.1
Strongly irresolute 함수라는 새로운 함수를 도입하여, 성질 및 기본적인 대수적 성질을 연구한다. 더우기, 알려진 s-연결성, s-조밀성 등과의 관계를 갖는 성질들을 알아본다. In this note, a mapping ∫: X→Y is introduced to be strongly irresolute iff ∫(scl A)⊂∫(A) for all subsets A of X, where scl A means the semi-closure[1]of A in X. Some characterizations of these mappings are established and some of its basic algebraic properties are investigated. Further, some of its properties related to other known concepts, viz., scompactness, are discussed.
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On mappings with strongly semi-closed graphs
Chae, Gyu Ihn,Dube.K.K,Panwar, O.S 울산대학교 1984 연구논문집 Vol.15 No.2
우리는 strongly 반폐그래프라는, 새로운 약화된 폐그래프를 정의하여, 그 성질과 이미 알려진 여러 약화된 폐그래프들의 성질과 비교하고, 새로 도입된 이 개념은 폐그래프와는 독립적임을 보인다. 여러 사상들이 Strongly 반폐그래프를 가질 때 성질을 알아보고 그 개념을 이용 Semi-T₁공간, semi-T₂공간들의 성질을 알아본다. A mapping f : X→Y has a strongly semi-closed graph iff for each(x,y) G(f), there exist semi-open sets U and V containing x, y, respectively, such that (U×scl V)∩G(f)= . This type of graph is weaker than a strongly-closed graph [12] and is stronger than a semi-closed graph [7]. However, it is independent of a closed graph. Several known mappings may fail to have a strongly semi-closed graph and similarly, a mapping having a strongly semi-closed graph need not be a certain type of mappings. Conditions under which a certain mapping has a strongly semi-closed graph and conditions under which range or/and domain of a mapping having a strongly semi-closed graph become semi-T₁or/and semi-T₂are obtained.
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A NOTE ON WEAKLY IRRESOLUTE MAPPINGS
Chae, Gyu-Ihn,Dube, K.K.,Panwar, O.S. The Youngnam Mathematical Society Korea 1985 East Asian mathematical journal Vol.1 No.-
A mapping f: X$\rightarrow$Y is introduced to be weakly irresolute if, for each x $\varepsilon$ X and each semi-neighborhood V of f(x), there exists a semi-neighborhood U of x in X such that $f(U){\subset}scl(V)$. It will be shown that a mapping f: X$\rightarrow$Y is weakly irresolute iff(if and only if) $f^{-1}(V){\subset}sint(f^{_1}(scl(V)))$ for each semiopen subset V of Y. The relationship between mappings described in [3,5, 6,8] and a weakly irresolute mapping. will be investigated and it will be shown that every irresolute retract of a $T_2$-space is semiclosed.
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Effect of Metallic Interfacial Layers on the Properties of Diamond-Like Carbon Thin Films
Neeraj Dwivedi,Sushil Kumar,Sreekumar C,Saurabh Dayal,C. M. S. Rauthan,O.S. Panwar 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
Diamond like carbon (DLC) thin films with metallic interfacial layers of aluminum and nickel-chromium (Al and Ni-Cr) were grown using a low cost hybrid technique involving a resistive heating thermal evapo-rator and radio frequency plasma enhanced chemical vapor deposition techniques. Stress, hardness, elastic modulus, bonding, phase, and electrical conductivity of these films were investigated. Introduction of interfacial Al and Ni-Cr layers in DLC led to drastic improvement of its conductivity along with a signifi-cant reduction in residual stress but with some reduction of hardness and the elastic modulus. The struc-tural and surface properties of thin films were studied using X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy techniques.
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Structural and Nano-Mechanical Properties of Nanostructured Diamond-Like Carbon Thin Films
Saurabh Dayal,Sushil Kumar,Neeraj Dwivedi,Sreekumar Chockalingam,C. M. S. Rauthan,O.S. Panwar 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
The effect of self bias on structural and nano-mechanical properties of nanostructured diamond-like carbon (ns-DLC) thin films is explored. These films are grown at different negative self biases ranging from −100 V to −200 V using radio frequency (13.56 MHz) plasma enhanced chemical vapor deposition technique. The generation of nanostructured morphology at room temperature in these films is confirmed by scanning electron microscopy, whereas change in microstructure produced by varying the self biases is confirmed by Raman analysis. These ns-DLC films exhibit very high hardness, which varied from 16 GPa to 31 GPa. With the help of load versus displacement curves, various other important nano-mechanical parameters such as elastic modulus, elastic recovery etc are also estimated. The nano-mechanical properties are further correlated with the Raman and SEM analyses. Owing to their versatile nano-mechanical properties, these ns-DLC films may find application as hard and protective coatings.
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