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Parvez, Md.K.,Yoo, G.M.,Kim, J.H.,Ko, M.J.,Kim, S.R. North Holland 2010 Chemical physics letters Vol.495 No.1
Oxygen plasma and ion-beam treatments of nano-structured TiO<SUB>2</SUB> were carried out to enhance the efficiency of dye-sensitized solar cells (DSSCs). Relative changes in surface states and recombination reactions were examined. Comparative studies showed that the oxygen ion-beam treatment was more effective in reducing the number of oxygen vacancies in TiO<SUB>2</SUB> and the recombination reactions between TiO<SUB>2</SUB> conduction band electrons and I<SUB>3</SUB><SUP>-</SUP> ions in the electrolyte than the plasma treatment. Oxygen ion-beam treated TiO<SUB>2</SUB> film in the DSSC showed a 23mV increase in the open-circuit voltage (V<SUB>oc</SUB>) and an improvement in the photo-conversion efficiency from 5.05% to 6.64%.
Cospectral and hyper-energetic self complementary comparability graphs
Merajuddin,S. A. K. Kirmani,Parvez Ali,S. Pirzada 한국산업응용수학회 2007 Journal of the Korean Society for Industrial and A Vol.11 No.3
A graph G is self-complementary (sc) if it is isomorphic to its complement. G is perfect if for all induced subgraphs H of G, the chromatic number of H (denoted X(H)) equals the number of vertices in the largest clique in H (denoted w(H)). An sc graph which is also perfect is known as sc perfect graph. A comparability graph is an undirected graph if it can be oriented into transitive directed graph. An sc comparability (sec) is clearly a subclass of sc perfect graph. In this paper we show that no two non-isomorphic sec graphs with n vertices each, (n < 13) have same spectrum, and that the smallest positive integer for which there exists hyper-energetic sec graph is 13.
Cospectral and hyper-energetic self complementary comparability graphs
( Merajuddin ),( S. A. K. Kirmani ),( Parvez Ali ),( S. Pirzada ) 한국산업응용수학회(구 한국산업정보응용수학회) 2007 한국산업정보응용수학회 Vol.11 No.3
A graph G is self-complementary (sc) if it is isomorphic to its complement. G is perfect if for all induced subgraphs H of G, the chromatic number of H (denoted X(H)) equals the number of vertices in the largest clique in H (denoted w(H)). An sc graph which is also perfect is known as sc perfect graph. A comparability graph is an undirected graph if it can be oriented into transitive directed graph. An sc comparability (scc) is clearly a subclass of sc perfect graph. In this paper we show that no two non-isomorphic scc graphs with n vertices each, (n < 13) have same spectrum, and that the smallest positive integer for which there exists hyper-energetic scc graph is 13.
Production of Virus Free Seeds using Meristem Culture in Tomato Plant under Tropical Conditions
Alam M.F.,Banu M.L.A.,Swaraz A.M.,Parvez S.,Hossain M.,Khalekuzzaman M.,Ahsan N. The Korean Society of Plant Biotechnology 2004 Plant molecular biology and biotechnology research Vol.6 No.4
Protocol was established for production of virus free healthy seeds using meristem ($0.3-0.5\;\cal{mm}$ in size) culture and field management under net house condition in tomato. The isolated meristem was found well established in MS liquid medium containing $0.1\;\cal{mg}\;1^{-1}\;of\;GA_3$. For shoot and root development either from primary meristem or from nodal segment of meristem derived plants, semisolid MS medium having $0.5\;\cal{mg}\;1^{-1}$ of IBA was found most effective. The elimination of the studied viruses (ToMV, CMV, ToLCV) in meristem-derived plants was confirmed by DAS-ELISA test. For field management of the virus eradicated meristem-derived plants, use of net house was found very effective measures to check viral vector visit and eventually infection. The meristem-derived plants were vigor and high yielder than the native seed derived plants and produced healthy seeds. Due to stop vector visit, no viral symptoms were observed in both $R_1\;and\;R_2$ plants cultivated in net house condition. Starting of viral infestation was observed in $R_2$ generation when they were planted in open house condition without control of vector visit. Therefore, for management of viral diseases, use of virus free meristem derived plantlets and their subsequent cultivation in soil under net house condition without using any vector killing insecticide can be recommended for producing healthy seeds in tomato. The developed protocol for environmentally healthy tomato seed production in Bangladesh may be used in the countries having similar tropical like environment conducive for viral vector visit.