Disentangled structural and vibrational characteristics of methylammonium halide perovskite MAPbBr3-xClx with x = 0 ~ 3 studied by X-Ray diffraction and Raman scattering

Naqvi Furqan Ul Hassan,Naqvi Furqan Ul Hassan,Kim Tae Heon,Ahn Chang Won,Hwang Younghun 한국물리학회 2022 Current Applied Physics Vol.44 No.-

Structural and vibrational characteristics of methylammonium(MA) halide perovskite MAPbBr3-xClx single crystals (x = 0–3) were investigated by using powder X-ray diffraction and Raman scattering experiments. The lattice constant in the cubic phase obtained from powder X-ray diffraction peaks at room temperature showed nearly a linear dependence as a function of composition. On the other hand, some of the Raman mode frequencies obtained from single crystals exhibited substantial changes in both frequency shifts and half widths over the investigated composition range. Especially, the MA torsional mode showed a significant change from 325 to 485 cm 1 and mode splitting as Cl was replaced by Br. This mode splitting was more clearly seen at low temperatures reflecting the symmetry lowering of the local structure. The contrast between the linear change in the lattice constant and the substantial change in the vibrational frequencies and half widths of the MA torsional mode in the intermediate composition range indicates the local heterogeneous environment for the MA cations caused by the substitutional disorder.

Sequence Analysis of Hypothetical Proteins from Helicobacter pylori 26695 to Identify Potential Virulence Factors

Naqvi, Ahmad Abu Turab,Anjum, Farah,Khan, Faez Iqbal,Islam, Asimul,Ahmad, Faizan,Hassan, Md. Imtaiyaz Korea Genome Organization 2016 Genomics & informatics Vol.14 No.3

Helicobacter pylori is a Gram-negative bacteria that is responsible for gastritis in human. Its spiral flagellated body helps in locomotion and colonization in the host environment. It is capable of living in the highly acidic environment of the stomach with the help of acid adaptive genes. The genome of H. pylori 26695 strain contains 1,555 coding genes that encode 1,445 proteins. Out of these, 340 proteins are characterized as hypothetical proteins (HP). This study involves extensive analysis of the HPs using an established pipeline which comprises various bioinformatics tools and databases to find out probable functions of the HPs and identification of virulence factors. After extensive analysis of all the 340 HPs, we found that 104 HPs are showing characteristic similarities with the proteins with known functions. Thus, on the basis of such similarities, we assigned probable functions to 104 HPs with high confidence and precision. All the predicted HPs contain representative members of diverse functional classes of proteins such as enzymes, transporters, binding proteins, regulatory proteins, proteins involved in cellular processes and other proteins with miscellaneous functions. Therefore, we classified 104 HPs into aforementioned functional groups. During the virulence factors analysis of the HPs, we found 11 HPs are showing significant virulence. The identification of virulence proteins with the help their predicted functions may pave the way for drug target estimation and development of effective drug to counter the activity of that protein.

Discriminating between intentional and unintentional gaze fixation using multimodal-based fuzzy logic algorithm for gaze tracking system with NIR camera sensor

Naqvi, Rizwan Ali,Park, Kang Ryoung SPIE - International Society for Optical Engineeri 2016 Optical engineering Vol.55 No.6

Effect of Superovulatory Regimens on Ovarian Response and Embryo Production in Fine Wool Sheep in Tropics

Naqvi, S.M.K.,Gulyani, R.,Pareek, S.R. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.5

Fine wool sheep (n=18) maintained in a tropical environment were allocated to three treatment groups. Estrus was induced with two injections of $PGF_{2{\alpha}}$ (10 mg. im) at 10 days interval. Superovulation treatment started 2 days prior to the second injection of $PGF_{2{\alpha}}$. Each ewe was treated with a total dose of 25 units FSH (Super-OV) i.m. every 12 hover 3 days; Group 2 were also injected i.m. with 200 IU PMSG at the first injection of FSH; Group 3 was treated as in Group 2 and also with GnRH ($4{\mu}g$ Buserelin) at the onset of estrus. The ewes in estrus were mated with a fertile ram. Ovarian examination and recovery of embryo and ova were performed at laparoscopy and laparotomy on day 3 or 4 after mating. Data for onset of estrus, duration of estrus, number of corpora lutea (CL), number of unnovulated large follicle (LF), embryo recovery rate, embryo quality and fertilization recorded for the 3 groups. Ewes in the Group 1 set in estrus later (p<0.05; $50.0{\pm}7.29h$) than the ewes in Group 2 ($24.5{\pm}3.58$) and 3 ($32.5{\pm}3.58h$). The duration of estrus, ovarian size and ovarian response (number of CL and LF) did not differ significantly (p>0.05) among the 3 groups. The proportion of ewes with a superovulatory response (${\geq}2$ CL) was the lowest (50%) in Group 1 treated with FSH alone but ova/embryo recovery (100%) and fertilization (100%) was significantly (p<0.05) higher than Group 2 (58.3 and 85.7%, respectively) and Group 3 (48.6 and 50%, respectively). It is concluded that in tropical fine wool sheep, there is no difference in the 3 treatments for yield of good quality embryos but ovarian response and ovulation rate increased on additional use of PMSG and GnRH respectively to FSH alone.

Finding Widespread Events with Simple Bitmaps

NAQVI, Syed Moeen Ali,YOON, MyungKeun Institute of Electronics, Information and Communic 2018 IEICE transactions on information and systems Vol.101e.d No.12

Multiple Softening of Low-Frequency Raman Modes of Tungsten-Bronze Lead Barium Niobate Relaxor Ferroelectric Single Crystals

Naqvi Furqan Ul Hassan,Ko Jae-Hyeon,Lim Ki-Soo 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.10

The vibrational properties of tetragonal tungsten-bronze lead barium niobate, Pb(1-x)}BaxNb2O6, with x = 0.5 were investigated by using Raman spectroscopy over a wide temperature range from room temperature to 550 °C. The Raman modes in the measured spectrum were divided into three spectral ranges, internal symmetric and antisymmetric vibrational modes of the oxygen octahedra and low-frequency external lattice modes. The temperature dependences of the Raman shifts showed anomalous changes at the ferroelectric phase transition temperature of ~350 °C. Especially, low-frequency modes below ~300 cm-1 commonly exhibited multiple softening upon heating toward the transition temperature, indicating that the lattice becomes softer on approaching the ferroelectric phase transition temperature.

A-site cation effect on optical phonon modes and thermal stability in lead-based perovskite bromide single crystals using Raman spectroscopy

Naqvi Furqan Ul Hassan,고재현,Kim Tae Heon,Ahn Chang Won,Hwang Younghun,Sheraz Mahshab,Kim Seungdo 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.3

Lead bromide perovskites have proven to exhibit high open-circuit voltage, which is a signifcant factor in enhancing the overall performance of a solar cell. Single crystals of FAPbBr3, MAPbBr3 and CsPbBr3 are synthesized by solvent evaporation method. This study investigates the thermal stability, photo physical properties, and optical phonon modes of lead bromide perovskites using various spectroscopic techniques. The thermal stability measurements prove CsPbBr3 to be more stable than two hybrid perovskites. Raman spectroscopic studies for all three perovskites are performed in a wide frequency range probing both low and high-frequency modes. Fitting analysis is done to know the exact comparison of the Raman shifts. The torsional mode shows large diference in frequency depending upon the cation. Correlation times are estimated to get more insights into the dynamics of cations and inorganic octahedral frameworks. The diference in vibrational modes upon substitution of cation, resulting in complex chemical interplay is investigated in detail

Comparative Perfonmance of Early and Late Maturing Nili Ravi Buffalo Heifers

Naqvi, A.N.,Shami, S.A. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.3

Age at maturity was studied in 661 Nili Ravi buffaloes maintained at six dairy farms in Pakistan. The mean age at maturity in the overall data from the six farms was $976.49{\pm}9.2$ days. Significantly lower mean age at maturity $(957.93{\pm}10.68\;days)$ was observed at Military Dairy Farm, Khyber Okara, Military Daiiy Farm, Punjnad and Livestock Research Station, National Agricultural Research Centre, Islamabad (Group I) compared to $(1015.26{\pm}17.39\;days)$ other three Military Dairy Farms, Peshawar, Nowshera and Rawalpindi (Group II). The advantages associated to early age at maturity were as following. Male and female calves were heavier $(38.35{\pm}0.17\;and\;31.84{\pm}15kg,\;respectively)$ in Group I as compared to $(29.27{\pm}0.26\;and\;26.27{\pm}0.26kg)$ in Group II. Milk yield per lactation was significantly higher in Group I $(1912{\pm}12\;lit.)$ as compared to $(1833.36{\pm}16.56\;lit.)$ in Group II. Lactation length was significantly longer $(284.41{\pm}1.23\;days)$ in Group I as compared to $(277.77{\pm}2.02\;days)$ in Group II. Dry period and service period were significantly shorter $(241.59{\pm}4.18\;and\;217.05{\pm}4.95\;days,\;respectively)$ in Group I as compared to $(306.39{\pm}78\;and\;280.95{\pm}9.32\;days)$ in Group II. The mean age at first calving and sex ratio were low ($1282.75{\pm}10.14$ days and 100 ♀ ♀:130.7 ♂ ♂) in Group I as compared to ($1308.7{\pm}16.44$ days and 100 ♀ ♀:152.15 ♂ ♂) in Group II but the differences were non significant.

A Case Study on the Relationship between Conductivity and Dissolved Solids to Evaluate the Potential for Reuse of Reclaimed Industrial Wastewater

Naqvi Sohail Ali,모경,김문일 대한토목학회 2012 KSCE Journal of Civil Engineering Vol.16 No.5

A case study was conducted to evaluate and identify the main materials and sources affecting the conductivity of reclaimed industrial wastewater for reuse. There were two suppliers (food production companies, S and M) and two users (pulp and paper making companies, P1 and P2). The user requirements for quality of the reclaimed water were conductivity <1,000 μS/cm and Volatile Suspended Solids (VSS) <10 mg/L. Conductivity of treated wastewater at M company varied from 872 to 1620 μS/cm, but the VSS was very stable over the year, with an average of 5 mg/L. According to the source tracking of M company, it was determined that the main materials affecting conductivity were TDS, Ca2+, and Na+. Electrical Conductivity (EC) measurement is sometimes the only practical method for the analysis of Total Dissolved Solids (TDS); therefore, developing this relationship would be helpful for company-to-company wastewater reuse. In this case study, the ratio of TDS to EC was in the range of 0.58-0.67, with a mean value of 0.64 and a very strong relationship at the effluent point. Even though the results were from only one industry, this conversion factor could be used to estimate TDS using EC measurements for similar industrial wastewater and could motivate further research for the direct use of treated industrial wastewater. This study is a first case study of company-to-company wastewater reuse.

Production of Crossbred Lambs through Artificial Insemination of Non-prolific Medium Size Malpura and Avikalin Ewes Using Fresh Diluted Semen of Prolific Micro Size Garole Rams

Naqvi, S.M.K.,Maurya, V.P.,Joshi, Anil,Sharma, R.C.,Mittal, J.P. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.5

Six adult Garole rams maintained under a semi-intensive system were used as semen donors for this study. Semen was collectied daily during the monsoon season with the help of an artificial vagina and examined for its quality characteristics. Ejaculates of thick consistency, rapid wave motion, ${\geq}80%$ motility and intense movement of motile spermatozoa were diluted at the rate of 1:1 with egg yolk McIllvaine glucose diluent at $30^{\circ}C$ in water bath. Estrus in ewes was detected by parading aproned rams of proven vigour at 12 h intervals. The ewes (54 Malpura and 23 Avikalin) in estrus were artificially inseminated with fresh diluted ram semen. The overall conception rate was 94.8%, (range 91.7 to 100%). The overall lambing percent was 80.5 with a range of 75.0 to 84.6%. There was no significant (p>0.05) difference in lambing and conception rate because of individual rams. Fertility was significantly lower (p<0.05) in ewes of less than two years and more than six years of age. Breed (Malpura and Avikalin) effect was not observed in conception and lambing rate (p>0.05). No significant difference (p>0.05) in birth weight and 12 month weight was observed between Garole${\times}$Avikalin and Garole${\times}$Malpura crossbred lambs but there was significant (p<0.05) difference at three month and six months body weight of both the crossbred lambs.