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Various investigators such as Khan ([1-4]), Khan and Ram [5], Chandra [6,7], Leindler [8], Mishra et al. [9], Mishra [10], Mittal et al. [11], Mittal, Rhoades and Mishra [12], Mittal and Mishra [13], Rhoades et al. [14] have determined the degree of approximation of 2π-periodic signals (functions) belonging to various classes Lip   , Lip r   Lip     , r t  , and W L of functions throu...

Bector et al., (1994) introduced the concept of univexity. Mishra (1998), Mishra and Reuda (2001) and Mishra et al., (2005) have applied and generalized these functions. Mathematical programming in complex spaces originated from Levinson’s discussion of linear problems (Levinson, 1966). Mishra and Reuda (2003) have generalized these upto first orders, second order with symmetric duality. Furthe...

We report on a theoretical study of spin-dependent electron transport through single-helical molecules connected by two nonmagnetic electrodes, and explain the experiment of significant spin-selective phenomenon observed in α-helical protein and the contradictory results between the protein and single-stranded DNA. Our results reveal that the α-helical protein is an efficient spin filter and th...

The aim of the present work has been directed to investigate the physico-chemical status of the soil at Majherdabri area of Jalpaiguri district, West Bengal, India. The soil samples have been collected using conventional method during summer (April) and winter (November). The samples collected from the adjacent forests serve as the control. The pH, organic C, available P, and K are determined b...

Different 3,4-dihydrobenzo[2,3-d] pyrimidine derivatives were synthesized by the condensation of substituted 1, 3cyclohexadienes and formamide, using inorganic solid supports under microwaves. Simple and commonly available compounds were used as starting materials in the reactions. The compounds were tested against different fungal and bacterial strains and found considerably effective.