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Aasif Helal,Muhammad Usman,Md. Eyasin Arafat,Mahmoud M Abdelnaby 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
The conversion of epoxides to cyclic carbonates is one of the most common CO2 fixation reactions. Metalorganicframeworks (MOFs), due to their porosity, easily tunable properties and Lewis acidic sites, areextensively used in heterogeneous catalysis. In this paper, we report the derivatization of the metalorganicframework (MOF) UiO-66 (University of Oslo) with allyloxy groups to give UiO-66-BAT(BAT = bisallyloxyterephthalate). The catalyst was characterized by PXRD, BET, IR, SEM, digestion NMRand CO2 adsorption. UiO-66-BAT had a good CO2 uptake of 84 cc/g at 273K and a Qst value of 27.5 kJ mol 1. Due to the affinity of the allyloxy group toward CO2 and the proximity of the zirconium Lewis acid sites,we applied UiO-66-BAT as a catalyst for the conversion of epoxides to cyclic carbonates by using CO2. Weshowed that UiO-66-BAT converts propylene oxide (PO) to its corresponding cyclic carbonates at 50 C, a5 bar pressure, and a 6 h reaction time with a 95% yield. UiO-66-BAT also gave a good yield in theconversion of numerous aliphatic and aromatic epoxides. The catalysts exhibited a good recyclability forup to 9 cycles.
Integration of the Indian Stock Market: at the angle of Time-Frequency
( Aasif Shah ),( Malabika Deo ) 세종대학교 경제통합연구소 2016 Journal of Economic Integration Vol.31 No.1
This paper uses wavelet correlation and cross correlation techniques to examine the integration between Indian and Asia Pacific equity markets. In the sense that both time and frequency domains can be taken into consideration, wavelets have been emerged as a perfect trade-off. Our results show that the Indian market is correlated with Asia Pacific markets largely on lower frequencies or longer time horizons implying that diversification opportunities for investors are more likely to exist at higher frequencies or shorter time horizons. The cross correlation result also reveals lead-lag relationship on lower frequencies which suggests investment strategies for investors operating in Indian market facing sudden changes in Asia Pacific markets.
Aasif Shah,Malabika Deo,Wayne King 대외경제정책연구원 2015 East Asian Economic Review Vol.19 No.2
Multi-scale representations are effective in characterising the time-frequency characteristics of financial return series. They have the capability to reveal the properties not evident with typical time domain analysis. Given the aforesaid, this study derives crucial insights from multi scale analysis to investigate the co- movements between Indian and emerging Asian equity markets using wavelet correlation and wavelet coherence measures. It is reported that the Indian equity market is strongly integrated with Asian equity markets at lower frequency scales and relatively less blended at higher frequencies. On the other hand the results from cross correlations suggest that the lead-lag relationship becomes substantial as we turn to lower frequency scales and finally, wavelet coherence demonstrates that this correlation eventually grows strong in the interim of the crises period at lower frequency scales. Overall the findings are relevant and have strong policy and practical implications.
Fluorescence Sensing Properties of 2-(2'-Hydroxyphenyl)quinoline and Derivatives
Helal, Aasif,Lee, Sang-Hoon,Ren, Wen Xiu,Cho, Chan-Sik,Kim, Hong-Seok Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.5
Novel chemosensors based on 2-(2'-hydroxyphenyl)quinoline were prepared and evaluated for sensing metal cations. The photophysical properties of chemosensors 1-3 were examined and their ion-selectivity was evaluated by measuring their fluorescent emission responses to alkali, alkaline earth, and transition metal ions. Chemosensors 1, 2 and 3 show ratiometric and enhanced fluorescence changes with transitional metals that are efficient fluorescence quenchers, especially 3 has a high binding constant with $Hg^{+2}$ in $CH_3CN$.
Dabbawala, Aasif A.,Alhassan, Saeed M.,Mishra, Dinesh K.,Jegal, Jonggeon,Hwang, Jin-Soo Elsevier 2018 Molecular catalysis Vol.454 No.-
<P>Mesoporous sulfated titania (MST), a solid acid catalyst has been prepared in one step by organic template free straightforward hydrolysis of titanium oxysulfate and subsequent calcination at different temperatures. The resultant nano-sized MST catalysts showed remarkable catalytic performances in solvent free cyclodehydration of sorbitol as compared to sulfated TiO2 prepared by conventional method. The catalyst activity of MST catalysts varied with calcination temperature and MST-450 (calcined at 450 degrees C) exhibited highest catalytic activity and isosorbide selectivity. The MST-450 catalyzed this dehydration reaction at comparatively lower reaction temperature and produced isosorbide with high selectivity in short reaction time. The complete conversion of sorbitol with 70% isosorbide selectivity was achieved in 2 h at 180 degrees C. The high catalytic activity of MST catalyst attributes to its high specific surface area, large pore size and hence facile diffusion of reactants into the pores and ease to access acid sites. Moreover, the effects of calcination temperature, sulfur content, catalyst amount, reaction temperature and reaction time on conversion and selectivity were studied and the catalyst was also reused.</P>
Impact of Lockdown on Air Pollutants during COVID-19 at Patna, India
Mohammed Aasif Sulaiman,Mohammad Masroor Zafar,Nishat Afshan,Anupma Kumari 한국대기환경학회 2021 Asian Journal of Atmospheric Environment (AJAE) Vol.15 No.4
Many countries shut their borders, imposed nationwide lockdown, and restricted several anthropogenic activities to arrest the spread of COVID-19. In the present study, the concentration of several air pollutants (PM10, PM2.5, NO2, NH3, SO2, CO and O3) during different phases of lockdown from monitoring stations of Patna was analyzed to assess the effect of lockdown restriction on air quality. Reduction in PM2.5, NH3, NO2, PM10 and CO concentration was observed by 59.79%, 58.2%, 49.49%, 39.57% and 24.04%, respectively during the lockdown period. National Air Quality Index (NAQI) value in the year 2020 had been observed to lower by 57.88% compared to the year 2019, during the same period. A more significant fall in the concentration of air pollutants was observed during the early phase of post-lockdown compared to the late stages of postlockdown. The study reflects the significance of restriction on anthropogenic activities in improving air quality and provides clues for future action plans for improving air quality.
Shahzad, M. Aasif,Nisa, M.,Sarwar, M. Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.7
The study was conducted to evaluate enzose (corn dextrose), a corn milling byproduct, as substitute for corn grain as energy in growing lambs. Five iso-caloric and iso-nitrogenous diets were formulated. The control diet (E0) had no enzose whereas enzose replaced 20, 40, 60 and 80% corn grain in E20, E40, E60 and E80 diets on the basis of energy supply, respectively. Fifty growing lambs were divided into 5 groups, 10 animals in each, in a randomized complete block design. Nutrients (dry matter, crude protein, neutral detergent fiber and acid detergent fibre) intake and digestibilities increased with gradual replacement of corn grain by enzose. Lambs fed E80 diet also retained higher nitrogen (N) than those fed E0 diet. Plasma glucose, $T_3$ and $T_4$ increased while urea N decreased in lambs receiving higher enzose content. Maximum weight gain was recorded in lambs fed diets containing maximum concentration of E as a replacement for corn grains. A better feed conversion ratio was recorded in lambs fed E80 compared with those fed E0 diet. The study suggests that enzose can be used as an economical feed ingredient to replace corn grain upto 80%, without any adverse effects on growth performance of growing lambs.
Engaging with the Local Narrative of Hagiography in Kashmir
Muhammad Maroof Shah Aasif Shah 부산대학교 한국민족문화연구소 2013 Localities Vol.- No.3
Local narratives when they contradict dominant episteme of the age may not be academically respectable. They may be discussed as something curious or interesting or for purely historical reasons or as a species of antique collections dumped into the wastebasket of history. And when these are about local beliefs and mythopoetic experiences they are more incredible to the scholarly. And historians today are trained not to take note of local narratives at face value and somehow appropriate their queerness. Often people’s gullibility or hagiographer’s zeal or faith is invoked to explain what appears to be scandalous to reason or received understanding of science. Once upon a time the world of angels, fairies and djinns were part of experience or explanatory framework to which people naturally subscribed. But in the secular age it is no longer a case. All these things appear relics of a bygone age of faith. Today hagiographers too have mostly succumbed to the fashions of the age and write as if ordinary stories of ordinary men. Engaging with traditional hagiographic accounts in the face of all these epistemic shifts resulting in either skewed reading in light of what appears as distorting mirror of rationalist framework and casting doubts on the claims of hagiographers may well be questioned on account of greater sensitivity shown, in the postmodern era, to other forms of rationality that better accommodate local narrative not fitting in the Grand Narratives of Enlightenment and Secular Humanism. Taking the test case of local narrative of belief in saints and their miraculous performances in Kashmir we argue that modernist historiography as practized in Kashmir seems to be guilty of epistemic violence while applying modernist tools to a traditional culture.