DAV (France)

In recent years, Silicene has attracted great interest in various fields but does not fit well in the field of thermoelectrics due to the absence of electronic band gap. Nevertheless, hydrogenation of silicene (SiH) delocalize the free electrons and induces gap widening (2.19 eV), but its thermoelectric performance is still limited due to the larger band gap. Thermoelectric performance can be effectively improved using strain engineering, which allows modulation of crystal as well as electronic energy levels of a material. We studied the effect of biaxial tensile strain on structure, stability and thermoelectric properties of SiH monolayer. Taking clue regarding the stability from phonon dispersion, tensile strain upto 14% is incorporated and results are discussed. The distortion of crystal structure with strain manipulates the characteristics of electronic band structure such that there is an indirect to direct band gap transition along with decrease in band gap, effective mass and relaxation time of carriers. As a result, the Seebeck coefficient falls and attains minimum value at 14% strain while electrical conductivity and electronic thermal conductivity shows increasing trend and maximize at 14% strain. Another crucial consequence of strain is that tensile strain led to a considerable decrease in lattice thermal conductivity. At a strain of 14%, the lattice thermal conductivity at 700 K (0.28) decreased by approximately 43% compared to its unstrained counterpart (0.49 K), which is highly beneficial for achieving high ZT. To assess the efficiency of thermoelectric conversion, the ZT is computed, revealing an increase from 1.66 in the unstrained state to 2.83 at a strain of 14% and a temperature of 700 K. The calculations unveil a nearly twofold increase in ZT with the implementation of strain engineering, underscoring its effectiveness in augmenting the efficiency of thermoelectric devices.

Abstract Phenyldiazenyl moiety has been utilized both as a protective and activating group to synthesize C-1-substituted tetrahydroisoquinolines via lithiation–substitution strategy. This reaction sequence involves generation of α-amino carbanions, derived from N-phenyldiazenyl tetrahydroisoquinolines, followed by coupling with various electrophiles, e.g., aldehyde, ketones, alkyl halide, oxiranes, isocyanates, and with in situ generated arynes. Deprotection of the protecting group was carried out under acidic conditions to afford the desired α-substituted products in moderate to good yields. So, triazene as a protecting/directing group and its compatibility with strong bases provide a good synthetic utility for the synthesis of a variety of α-substituted secondary amines via lithiation substitution reaction.

The kinetic studies of Ninhydrin (120 ppm) and Asparagine (100-1000-ppm) were undertaken at different temperatures viz.75 o C, 85 o C and 95 o C. The reaction of complexation was found to be of first order.The average rate of reaction for 120 ppm of Ninhydrin and 100 ppm of Asparagine was found to be 0.8529 x 10 -2 min -1 0.9394 x 10 -2 min -1 and 1.0830 x 10 -2 min -1 at 75 o C, 85 o C and 95 o C respectively.Similarly for Ninhydrin 120 ppm and Asparagine concentration of 1000 ppm the rate constant of complexation at 75 o C, 85 o C and 95 o C was observed to be 1.7919 x 10 -2 min -1 , 2.7047 x 10 -2 min -1 and 2.7818 x 10 -2 min -1 , respectively.

The exploration of an anthranilic acid based Schiff base SB as a "Turn-ON" fluorescent probe for the detection of highly toxic selenite (SeIV) and arsenite (AsIII) species in an aqueous medium is described. The selectivity of SB towards SeIV and AsIII in the presence of other ions was investigated by some spectrofluorimetric and 1H NMR spectroscopic experiments. The studies revealed the interaction between SB and AsIII via the deprotonation of phenolic -OH, which enhanced the conjugation in phenolate ion and in turn enhanced the emission response. The SB has analytical prospects for the quantification of AsIII and SeIV with good sensitivity (LODs; 5.15 ppb for SeIV and 3.12 ppb for AsIII calculated by S/N = 3σ/K). Furthermore, it can be used to evaluate real and synthetic samples for the presence of SeIV and AsIII species as well as the fabrication of on-spot recognition devices (in the form of silica gels SB@SiO2 and silica coated TLC aluminium strips SB@SiO2@Al).

The element of regionalism in Hindi novels is very old. Novels that have an overall depiction of the life of a particular state are called regional novels. Regional novels are often called character-oriented, While in these novels, the focus of the author is not so much on the characters as it is about presenting the culture of that region. That is why some people call these a novel without a hero, and consider the region as important as hero. In the present communication a detailed description of public life depicted in these regional Hindi novels.

Ancillarisation plays a significant role in achieving higher levels of economic growth on the one hand and employment generation especially among micro, small and medium enterprises on the other. Intellectual property is a product of the mind.

Cytogenetical investigations on a spontaneous male sterile mutant isolated from the inbred lines of white flowered variety of Petunia axillaris (Lam.) B.S.P., revealed a digenic pattern of inheritance of the mutant character. The original mutant as well as those obtained subsequently in F2 and F3 generations showed unimpaired female fertility and resembled in morphology the male fertile sibs, except for the small, shrivelled empty anthers.Microsporogenesis in the sterile paints was apparently normal upto the liberation of microspores from the tetrads, which degenerated subsequently resulting in complete absence of pollen grains in the anthers. In addition, male sterility was found to be invariably associated with atypical behaviour of tapetum, characterised by prolonged nuclear divisions and untimely degeneration as a result of conversion from glandular to periplasmodial type.