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Rana, Bidyut Kumar,Mishra, Snehasis,Sarkar, Deblina,Mondal, Tapan Kumar,Seth, Saikat K.,Bertolasi, Valerio,Das Saha, Krishna,Bielawski, Christopher W.,Isab, Anvarhusein A.,Dinda, Joydev The Royal Society of Chemistry 2018 NEW JOURNAL OF CHEMISTRY Vol.42 No.13
<P>To elucidate the intrinsic biological activities displayed by platinum <I>versus</I> gold-based organometallic reagents, the isoelectronic and isostructural square planar complexes [Pt(C∩N)(C)Cl][PF6] (2) and [Au(C∩N)(C)Cl][PF6]2 (3), which are supported by a common N-heterocyclic carbene, 1-methyl-2-pyridin-2-yl-2<I>H</I>-imidazo[1,5-<I>a</I>]pyridin-4-ylidene (1), were synthesized. The complexes were characterized using a range of spectroscopic techniques as well as single crystal X-ray diffraction and a series of computational studies were also performed to gain additional insight into their fundamental electronic bonding structures. The cytotoxicities of the complexes were tested <I>in vitro</I> against non-small lung carcinoma (A549), colorectal carcinoma (HCT-116) and human hepatocellular carcinoma (HepG2) cell lines. The measured IC50 values showed that the Au(iii)-NHC complex is more potent than its Pt analogue.</P>
A. Mondal,S. Chatterjee,A. McDonald Tariang,L. Prince Raj,K. Debnath Techno-Press 2023 Advances in aircraft and spacecraft science Vol.10 No.2
Drag reduction is significant research in aircraft design due to its effect on the cost of operation and carbon footprint reduction. Aircraft currently use conventional solid winglets to reduce the induced drag, adding extra structural weight. Fluidic on-demand winglets can effectively reduce drag for low-speed flight regimes without adding any extra weight. These utilize the spanwise airflow from the wingtips using hydraulic actuators to create jets that negate tip vortices. This study develops a computational model to investigate fluidic on-demand winglets. The well-validated computational model is applied to investigate the effect of injection velocity and angle on the aerodynamic coefficients of a rectangular wing. Further, the turbulence parameters such as turbulent kinetic energy (TKE) and turbulent dissipation rate are studied in detail at various velocity injections and at an angle of 30°. The results show that the increase in injection velocity shifted the vortex core away from the wing tip and the increase in injection angle shifted the vortex core in the vertical direction. Further, it was found that a 30° injection is efficient among all injection velocities and highly efficient at a velocity ratio of 3. This technology can be adopted in any aircraft, effectively working at various angles of attack. The culmination of this study is that the implementation of fluidic winglets leads to a significant reduction in drag at low speeds for low aspect ratio wings.
Enhanced efficiency in dye-sensitized solar cells based on mesoporous titanium phosphate photoanode
Park, K.H.,Mondal, S.,Ghosh, S.,Das, S.,Bhaumik, A. Elsevier 2016 Microporous and mesoporous materials Vol.225 No.-
<P>A new bilayer-nanostructured photoanode with mesoporous titanium phosphate (MTP1) as overlayer and titanium dioxide (TiO2) as underlayer has been fabricated. Mesoporous titanium phosphate material with high surface area (442 m(2) g(-1)) has been synthesized hydrothermally by using a new tailor made gemini surfactant under acidic pH conditions. HR TEM and N-2 sorption analysis revealed the presence of disordered mesopores of dimension ca. 4.50 nm in MTP1 material. Open-circuit voltage decay (OCVD) spectroscopy is used to investigate the kinetic process of electron transport and recombination within TiO2/TiO2, MTP1/TiO2, or MTP1/MTP1 based DSSCs, revealing a faster electron transport rate and a lower recombination rate in the MTP1/TiO2 photoanode. The energy conversion efficiency of dye-sensitized solar cells (DSSCs) based on such a MTP1/TiO2 photoelectrode shows a significant enhancement (6.0%) compared to TiO2/TiO2 photoelectrode (5.5%) with similar thickness (similar to 7 mu m), suggesting the favorable electron transport rate in former. (C) 2016 Elsevier Inc. All rights reserved.</P>
Maxwelle-Wagner polarization in grain boundary segregated NiCuZn ferrite
R.A. Mondal,B.S. Murty,V.R.K. Murthy 한국물리학회 2014 Current Applied Physics Vol.14 No.12
The present work investigates the polarization response in polycrystalline Ni0.9yCuyZn0.1Fe1.98O4d (y ¼ 0, 0.1, 0.2, 0.3, 0.4, 0.5) ferrite synthesized by solidestate reaction method. X-ray diffraction analysis confirmed cubic spinel phase formation in the calcined samples. Sintered samples contain a continuous network of CuO-rich segregation along the grain boundaries for y 0.2. Dielectric spectra showed a relaxation peak for y 0.2 in the frequency range of 1 kHze1 MHz. This relaxation has been explained based on MaxwelleWagner polarization considering two-layer model in connection with two heterogeneous dielectric media.
Borun K. Mondal,Sukumar Devnath,Dinesh C. Shaha,Mohammed N.A.khan,최재석 한국수산과학회 2008 Fisheries and Aquatic Sciences Vol.11 No.2
Relationships between total length (TL) and fecundity, body weight and fecundity, ovary length and fecundity, and ovary weight and fecundity of hilsa shad, Tenualosa ilisha Hamilton, collected from Kuakata, Patuakhali, Bangladesh, were studied. During the sampling period, the fecundity of hilsa was found to range from 169,000 (fish TL=28.0 cm, weight=250 g) to 1,088,000 (fish TL=40.5 cm, weight=955 g) with a mean of 520±53×1,000. The number of eggs per gram of ovary for samples collected from the anterior, middle, and posterior regions of the ovary were also recorded, but no significant variation was found among ovary regions at the 5% level of significance. Fecundity increased with fish TL and weight. The regression equations obtained in arithmetic forms of relationships between TL and fecundity (F), body weight (BW) and fecundity, ovary length (OL) and fecundity, and ovary weight (OW) and fecundity were F=-887,896+ 40,511×TL (r=0.85), F=67,577+755.44×BW (r=0.85), F=-562,070+87,668×OL (r=0.75) and F=124,815+6,596.7×OW (r=0.84), respectively. The relationships between fecundity and TL, body weight, ovary length, and ovary weight were linear, and the ‘r’ values were highly significant (p<0.01). These results provide valuable data for the restoration of hilsa resources, which are economically important but have shown reduced productivity in nations adjacent to the Bay of Bengal.
BHATTACHARYYA, ANINDITA,MONDAL, ASHOK,PAL, A.K.,SINGH, NIKHITA The Korean Society for Computational and Applied M 2022 Journal of applied mathematics & informatics Vol.40 No.5-6
This article aims to study the dynamical behaviours of a two species model in which non-selective harvesting of a prey-predator system by using a reasonable catch-rate function instead of usual catch-per-unit-effort hypothesis is used. A system of two ordinary differential equations(ODE's) has been proposed and analyzed with the predator functional response to prey density is considered as Hassell-Varley type functional responses to study the dynamics of the system. Positivity and boundedness of the system are studied. We have discussed the existence of different equilibrium points and stability of the system at these equilibrium points. We also analysed the system undergoes a Hopf-bifurcation around interior equilibrium point for a various parametric values which has very significant ecological impacts in this work. Computer simulation are carried out to validate our analytical findings. The biological implications of analytical and numerical findings are discussed critically.
Enhancement of Tensile Properties of AZ91–Ca–Sb Magnesium Alloy with SiC Nanoparticles Additions
Sourav Ganguly,Smarajit Sarkar,A. K. Mondal 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
The present work investigates the effect of SiC nanoparticles (SiCnp) additions on the tensile properties of the squeeze-castAZ91 + 2.0Ca + 0.3Sb (wt%) alloy at ambient, 423 K and 473 K temperatures. All the AZ91 + 2.0Ca + 0.3Sb + xSiCnp [x = 0.5wt% (0.29 vol%), 1.0 wt% (0.58 vol%), and 2.0 wt% (1.16 vol%)] nanocomposites illustrate greater yield strength and ultimatetensile strength in contrast to the AZ91 + 2.0Ca + 0.3Sb alloy at all the temperatures employed. The yield strength, ultimatetensile strength and elastic modulus of both the alloy and the nanocomposites decline as the temperature increases, whereasthe work to fracture increases with a rise in temperature. Among the nanocomposites, the one comprising of 2.0SiCnp demonstratesthe best tensile properties. All the nanocomposites display superior strain hardening response than the alloy, andthe maximum strain hardening is perceived in the AZ91 + 2.0Ca + 0.3Sb + 2.0SiCnp nanocomposite. The improved tensileproperties of the nanocomposites are ascribed to the reduced grain size, the increase in dislocation density owing to Coefficientof Thermal Expansion (CTE) mismatch between the alloy and the SiC nanoparticles, the Orowan strengthening aswell as the presence of a relatively higher amount of Al2Caphase in the nanocomposites. The contribution to the improvementof strength of the nanocomposites in decreasing order of their influence are the strengthening due to CTE mismatch,the Hall–Petch strengthening, and Orowan strengthening. The fracture surfaces of the tensile specimens tested at 298 Kconfirmed the presence of transgranular cleavage fracture which remained unchanged at 473 K as well.
Kamal, A.H.M.,Uddin, K.H.,Islam, M.M.,Mondal, M.M.H. Asian Australasian Association of Animal Productio 1996 Animal Bioscience Vol.9 No.5
The studies on the prevalence of ixodid ticks during July 1991 to June 1992 in five thanas of Chittagong hilly area in Bangladesh revealed that 65.45% cattle and 44.4% goats were infested with Boophilus microplus, Rhipicephalus appendiculatus and Haemaphysallis bispinosa. Aside these, only 4.62% cattle were found infested with Amblyomma sp. The tick infestation was highest in summer and declined gradually through rainy season to lowest in winter.
Nisheeth Kr. Prasad,A. S. Pathak,S. Kundu,K. Mondal 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
The effect of deaeration, Cl−ion content and strong oxidizer on the active behavior of the high phosphorus pig iron (HPPI)samples was studied in 3.5% NaCl and 1 N HNO3solutions. Deaerating the 3.5% NaCl solution could effectively shift thecorrosion potential of the HPPI below the protective potential of the steel in seawater [− 0.778 V vs saturated calomelelectrode (SCE)], which has not been observed in the freely aerated 3.5% NaCl solution. Both the Cl−ion content and thedeaerated conditions restrict the formation of the stable iron phosphate on the surface and promote the dissolution of the pigiron as soluble iron phosphate hydrate (FePO4·2H2O). However, in the case of the freely aerated nitric acid solution, evenwith deaeration, the HPPI samples have shown more noble behavior as compared to the mild steel due to the strong oxidizingnature of nitric acid and the formation of a stable iron phosphate on the surface.