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Synthesis and Characterization of Intergrowth Type Perovskite Oxide NdSr_2MnCrO_7
Devinder Singh 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
A new Ruddlesden-Popper phase NdSr_2MnCrO_7 has been prepared by the standard ceramic method. The powder X-ray diffraction studies suggest that the phase crystallizes with tetragonal unit cell in the space group I4/mmm. The electrical transport properties show that the phase is an electrical insulator and the electrical conduction in the phase occurs by a 3D variable range hopping mechanism. The magnetic studies suggest that the ferromagnetic interactions are dominant.
Devinder Singh,Sushma Sharma,Arun Mahajan,Suram Singh,Rajinder Singh 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.6
Intergrowth perovskite type complex oxides La0.8Ln0.2Sr2MnCrO7-δ (Ln=La, Nd, Gd, and Dy) have been synthesized by sol-gel method. Rietveld profile analysis shows that the phases crystallize with tetragonal unit cell in the space group I4/mmm. The unit cell parameters a and c decrease with decreasing effective ionic radius of the lanthanide ion. The magnetic studies suggest that the ferromagnetic interactions are dominant due to Mn3+–O–Mn4+ and Mn3+–O–Cr3+ double exchange interactions. Both Weiss constant (θ) and Curie temperature (TC) increase with decreasing ionic radius of lanthanide ion. It was found that the transport mechanism is dominated by Mott’s variable range hopping (VRH) model with an increase of Mott localization energy.
Singh, Devinder Korean Chemical Society 2011 대한화학회지 Vol.55 No.4
새로운 층상구조인 페로브스카이트 망가나이트 $La_{0.5}Sr_{1.5}Mn_{0.5}Cr_{0.5-x}Fe_xO_4$ (x=0.15, 0.3) 를 세라믹 방법에 의해 합성하였다. 분말 X-선 측정을 통하여 I4/mmm 의 정방정계 단위세포를 확인하였다. 전기전도도 측정을 통하여 부도체의 특성을 확인하였으며 전기전도도는 3D 홉핑 메커니즘에 의해 나타난다. 자기적 특성은 모두 반강자성의 특성을 보인다. The new layered perovskite manganites $La_{0.5}Sr_{1.5}Mn_{0.5}Cr_{0.5-x}Fe_xO_4$ (x=0.15, 0.3) have been prepared by standard ceramic method. The powder X-ray diffraction studies show that the phases crystallize with tetragonal unit cell in the space group I4/mmm. The electrical transport properties suggest that the phases show insulating behaviour and the electrical conduction in the phases occurs by a 3D variable range hopping mechanism. The magnetic properties suggest that both the phases are antiferromagnetic.
Devinder Singh,Madhu Bala 한국곤충학회 2011 Entomological Research Vol.41 No.2
Survival of larvae of known ages after 2 to 6 h of submersion under water was assessed by observing pupation and adult emergence in the cases of two blowflies of forensic importance, Chrysomya megacephala (Fabricius) and Chrysomya rufifacies (Macquart). Lowest survival occurred among 10-h-old larvae, which could not tolerate more than 2 h of submergence. Even with such a small period of submergence success of survival was only 33%. There were no survivors when 20- and 30-h-old larvae were submerged for more than 3 and 4 h, respectively. In the cases of 40-, 50-, 60- and 70-h-old larvae there were no survivors if submergence was more than 5 h. The results show that there is an inverse relationship between submergence period and survival rate: the longer the submergence period, the lesser is the survival rate. This study provides data that are potentially useful in estimating the minimum time since submergence (TSS) of a corpse during forensic investigations.
Devinder Pal Singh 한국유통과학회 2014 유통과학연구 Vol.12 No.1
Purpose - This study aims to examine the Indian consumers’mall shopping patronage with the application of theory of planned behavior (TPB). The research intends to extend the TPB components (attitude, self-efficacy, subjective norms) with the addition of self-image and study their effect on Indian consumers’ mall patronage intention. Research design, data and methodology - The research employed factor analysis to verify correct loading of items on corresponding factors and to confirm the applicability of constructs in the Indian context. The model was tested using stepwise regression analysis. Results –The results indicate a positive relationship between self-efficacy and intention to mall patronage. The findings show that self-image, attitude, self-efficacy, subjective norm significantly influence the mall patronage intention. Self-efficacy, which signifies self-competence and confidence in one’s ability as a mall shopper indicates that as the self-efficacy increases Indian consumers’ will eventually patronize malls. Conclusions – Self-image congruency plays a salient role in predicting mall-shopping patronage. The mall management should ensure that the mall marketing strategies incorporate it along with the other components of TPB to warrant decent footfall.
Antioxidants in the Prevention of Renal Disease
Devinder Singh,Rajnendrapal?aur,Vikas Chander,Kanwaljit Chopra 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.4
Reactive oxygen species (ROS) play a key role in the pathophysiological processes of renal diseases. The cel-lular damage is mediated by an alteration in the antioxidant status, which increases the concentration of ROS in the station-ary state (oxidative stress). Oxidative stress mediates a wide range of renal impairments, from acute renal failure, rhabdomy-olysis, obstructive nephropathy, hyperlipidemia, and glomerular damage to chronic renal failure and hemodialysis. Therefore,interventions favoring the scavenging and/or depuration of ROS (dietary and pharmacological antioxidants) should attenuateor prevent the oxidative stress, thereby mitigating against the subsequent renal damage.
Singh, Devinder,Sharma, Sushma,Mahajan, Arun,Singh, Suram,Singh, Rajinder Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.6
Intergrowth perovskite type complex oxides $La_{0.8}Ln_{0.2}Sr_2MnCrO_{7-{\delta}}$ (Ln=La, Nd, Gd, and Dy) have been synthesized by sol-gel method. Rietveld profile analysis shows that the phases crystallize with tetragonal unit cell in the space group I4/mmm. The unit cell parameters a and c decrease with decreasing effective ionic radius of the lanthanide ion. The magnetic studies suggest that the ferromagnetic interactions are dominant due to $Mn^{3+}$-O-$Mn^{4+}$ and $Mn^{3+}$-O-$Cr^{3+}$ double exchange interactions. Both Weiss constant (${\theta}$) and Curie temperature ($T_C$) increase with decreasing ionic radius of lanthanide ion. It was found that the transport mechanism is dominated by Mott's variable range hopping (VRH) model with an increase of Mott localization energy.
Singh, Devinder Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
A new Ruddlesden-Popper phase $NdSr_2MnCrO_7$ has been prepared by the standard ceramic method. The powder X-ray diffraction studies suggest that the phase crystallizes with tetragonal unit cell in the space group I4/mmm. The electrical transport properties show that the phase is an electrical insulator and the electrical conduction in the phase occurs by a 3D variable range hopping mechanism. The magnetic studies suggest that the ferromagnetic interactions are dominant.
Effect of Consumer Innovativeness on Online Buying Behavior in an Emerging Market
Devinder Pal Singh 한국유통과학회 2016 유통과학연구 Vol.14 No.7
Purpose – India is predicted to lead the world in online sales, but the behavioral range of online consumer has not been researched adequately. Moreover, the research on the role of psychological variables like consumer innovativeness in online purchase behavior has not been investigated. This paper aims to unravel the role of ‘consumer innovativeness’ in predicting online purchase intention. Further, this paper examines the effect of consumer innovativeness on ‘online information search’ and ‘attitude’ in online purchase areas. Research design, data, and methodology – This study uses factor analysis to confirm the convergent and discriminant validities from the adopted scales. Regression analysis was employed to test the various hypotheses in this study. Results – This study finds that consumer innovativeness affects positively ‘information search’, ‘attitude’ and ‘purchase intentions’ in online purchase circumstances. Conclusions – Consumer Innovativeness has emerged as a significant factor affecting online purchase intentions. It has also been confronted with an important variable affecting online information search and attitudes for online purchase.