On homogenization of electromagnetic crystals formed by uniaxial resonant scatterers

Dispersion properties of electromagnetic crystals formed by small uniaxial resonant scatterers (magnetic or electric) are studied using the local field approach. The goal of the study is to determine the conditions under which the homogenization of such crystals can be made. Therefore the consideration is limited by the frequency region where the wavelength in the host medium is larger than the lattice periods. It is demonstrated that together with known restriction for the homogenization related with the large values of the material parameters there is an additional restriction related with their small absolute values. From the other hand, the homogenization becomes allowed in both cases of large and small material parameters for special directions of propagation. Two unusual effects inherent to the crystals under consideration are revealed: flat isofrequency contour which allows subwavelength imaging using canalization regime and birefringence of extraordinary modes which can be used for beam splitting.Comment: 16 pages, 12 figures, submitted to PR

Dyeing of chemically modified cotton fabric

35-40The effect of concentration of three different N-methylol acrylamide derivatives, pH of finishing bath, curing temperature and type of catalyst on the extent of reaction of N-methylolated derivatives with cotton fabric has been studied with a view to obtain good fabric performance with better resiliency. The reactive compounds used were bis(N-methylol-2-carbamoylethyl) butylamine (I), N-(N,N-dimethylol-2- carbamoylethyl)diethylamine (II) and N-(N, N-dimethylol-2-carbamoylethyl) dimethylamine (III). The chemically modified cotton fabric was dyed with an acid dye (Polar Red RS) which has no affinity for cotton. Factors affecting the dyeability have also been studied. It is observed that the colour strength and dry crease recovery of the dyed finished fabric increase with the increase in the concentration of reactive compounds and dye. The colour strength of the dyed modified fabrics is higher for reactive compound II followed by I and III. Higher crease recovery values obtained in case of compound III are attributed to the formation of complex crosslinked cellulose which reduces reactivity towards dyeing

Triple antibiotic paste and simvastatin in the treatment of non-vital primary molars with inflammatory root resorption: A randomized control trial

  Aim: This study aimed to compare the success rate of pulp therapy of non-vital primary molars with inflammatory root resorption when treated using triple antibiotic mix or simvastatin as a component in the root filling material. Methodology: Lesion Sterilization and tissue repair was employed in the treatment of 30 non-vital primary molars exhibiting inflammatory root resorption and furcation radiolucency. The molars included in the study were randomly allocated into 2 equal groups. All root canals were instrumented 1mm from the radiographic apex, and an obturation mix was used to fill the canals to avoid the hollow tube effect. Triple antibiotic paste (TAP) was prepared by mixing ciprofloxacin, cefixime, and metronidazole in a 1:1:1 ratio. It was used as the active agent in group I and mixed with zinc oxide powder and polyethylene glycol + propylene glycol as a vehicle to prepare a filling material. For group II, simvastatin was used as the active agent alone. Following pulp therapy, all teeth were restored with stainless steel crowns, 1-week postoperative. Clinical evaluation was carried out at 1 week postoperative, then at 3, 6, and 12 months while radiographic evaluation was carried out at 6 and 12 months using predetermined criteria.&nbsp