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Teleparallel Energy-momentum Distribution of Locally Rotationally Symmetric Spacetimes
M. Jamil Amir,Tahir Nazir 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.9
In this paper, we explore the energy-momentum distribution of locally rotationally symmetric(LRS) spacetimes in the context of the teleparallel theory of gravity by considering the three metrics,I, II and III, representing the whole class of LRS sapcetimes. In this regard, we use the teleparallelversions of the Einstein, Landau-Lifshitz, Bergmann-Thomson, and M¨oller prescriptions. Theresults show that the momentum density components for the Einstein, Bergmann-Thomson, andM¨oller prescriptions turn out to be same in all cases of the metrics I, II and III, but are differentfrom those of the Landau- Lifshitz prescription, while the energy components remain the same forthese three prescriptions only in all possible cases of the metrics I and II. We mention here thatthe M¨oller energy-momentum distribution is independent of the coupling constant ; that is, theseresults are valid for any teleparallel models.
최재민,정다함,조은애,전봉현,박세연,유재혁,M. Nazir Tahir,정선호 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
An efficient new material for removal of mercury from water was prepared by the chemicallyfunctionalization of silica gel. Various monolayers were grafted on the silica gel surface to attachterminal alkynyl groups. All modified surfaces were characterized by XPS, ATR-IR and elemental analysiswhile Hg2+ concentrations were determined by ICP-OES. The Hg2+ adsorption reached equilibriumwithin 2 h with maximum adsorption capacities of 174.3 mg g 1 for alkynyl monolayers functionalizedsilica gel. Due to relatively lower price of silica gel, it can be efficiently used after functionalization onlarge scale to remove Hg2+ ions from the wastewater.