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Shailesh Kumar,Monoj Kumar Mondal 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.6
CO2 solubility data are important for the efficient design and operation of the acid gas CO2 capture process using aqueous amine mixture. 2-(Diethylamino)ethanol (DEEA) solvent can be manufactured from renewable sources like agricultural products/residue, and 1,6-hexamethyldiamine (HMDA) solvents have higher absorption capacity as well as reaction rate with CO2 than conventional amine‐based solvents. The equilibrium solubility of CO2 into aqueous binary mixture of DEEA and HMDA was investigated in the temperature range of 303.13-333.13 K and inlet CO2 partial pressure in the range of 10.133-20.265 kPa. Total concentration of aqueous amine mixtures in the range of 1.0-3.0 kmol/m3 and mole fraction of HMDA in total amine mixture in the range of 0.05-0.20 were taken in this work. CO2 absorption experiment was performed using semi-batch operated laboratory scale bubble column to measure equilibrium solubility of CO2 in amine mixture, and CO2 absorbed amount in saturated carbonated amine mixture was analyzed by precipitation-titration method using BaCl2. Maximum equilibrium CO2 solubility in aqueous amine mixture was observed at 0.2 of HMDA mole fraction in total amine mixture with 1.0 kmol/m3 total amine concentration. New solubility data of CO2 in DEEA+HMDA aqueous mixtures in the current study was compared with solubility data available in previous studies conducted by various researchers. The study shows that the new absorbent as a mixture of DEEA+HMDA is feasible for CO2 removal from coal-fired power plant stack gas streams.
Selection of efficient absorbent for CO2 capture from gases containing low CO2
Shailesh Kumar,Monoj Kumar Mondal 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2
Amine-based absorption processes are widely used in natural gas processing, but recently they have been considered for CO2 capture from flue gas emitted from thermal power plants. The main issue of amine used in the CO2 capture process is the high cost of solvent regeneration. So, this issue can be solved by using efficient amine absorbent. The amine type absorbents employed in the experimentation were an aqueous blend of 2-(Diethylamino)ethanol (DEEA) with different types of diamine activators such as piperazine (PZ), 2-(2-aminoethylamino)ethanol (AEEA), hexamethylenediamine (HMDA), ethylenediamine (EDA), and 3-(Dimethylamino)-1-propylamine (DMAPA). An absorption experiment was performed to evaluate the CO2 absorption performance in terms of CO2 loading, absorption capacity, and absorption rate. The experiment was performed to assess the CO2 desorption performance in terms of desorption capacity, desorption rate, cyclic capacity, and regeneration efficiency. From the results of absorptiondesorption and comparison with benchmark amine absorbent MEA, the aqueous blend of DEEA and HMDA indicated the best performance for CO2 capture applications among all the tested amine blends.
Non-Newtonian power-law flow across a confined triangular bluff body in a channel
Amit Kumar Dhiman,Shailesh Kumar 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
Wall effects on the flow of incompressible non-Newtonian power-law fluids across an equilateral triangular cylinder confined in a horizontal plane channel have been investigated for the range of conditions: Reynolds number,Re=1-40, power-law index, n=0.4-1.8 (covering shear-thinning, Newtonian and shear-thickening behaviors) and blockage ratio=0.125-0.5. Extensive numerical results on flow pattern, wake/recirculation length, individual and overall drag coefficients, variation of pressure coefficient on the surface of the triangular cylinder and so forth are reported to elucidate the combined effect of power-law index, blockage ratio and Reynolds number. The size of vortices decreases with an increase in the value of the blockage ratio and/or power-law index. For a fixed value of the Reynolds number, individual and overall drags decrease with decrease in power-law index and/or blockage ratio in steady confined flow regime. Simple correlations of wake length and drag are also obtained for the range of settings considered.
Patel Priya,Singh Shailesh,Patel Arvind Kumar,Kumar Bhupendra,Singh Arvind Kumar,Kumar Dinesh 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Parthenium hysterophorus L. (Asteraceae) is a toxic weed of agricultural farms, pastures and wastelands with a pan-tropical distribution. The weed causes a reduction in crop production of agricultural fields and severe health problems in humans. The Mexican beetle, Zygogramma bicolorata Pallister (Coleoptera: Chrysomelidae) is among the most promising candidates for the weed biocontrol. However, no previous study has evaluated assimilation of nutrients in this beetle. In the present study, feeding attributes and assimilation of nutrients by larvae of Z. bicolorata were assessed on the weed. Results revealed that the first larval instars of Z. bicolorata exhibited lowest consumption rates, and accumulated minimum concentrations of glucose, proteins and triglycerides in their body. They showed compensatory feeding, and displayed highest food utilization efficiencies and developmental rates. In contrast, the fourth larval instars exhibited higher food consumption rates and conversion efficiencies, but displayed lowest developmental rates. Accumulation of food reserves was also recorded maximum for the fourth larval instars. Overall, the findings may aid current mass-rearing efforts for Z. bicolorata in laboratories, but field trials are still needed to strengthen the present findings.
Kumar, Santosh,Shah, Priyank N.,Kang, Beom-Goo,Min, Joon-Keun,Hwang, Woon Sung,Sung, Ik Kyung,Shah, Shailesh R.,Murthy, Chivukula N.,Ahn, Seonyoung,Chang, Taihyun,Lee, Jae-Suk Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of polymer science Part A, Polymer chemist Vol.48 No.12
<P>A new methodology is successfully used for the concurrent synthesis of three different copolymers; diblock, triblock, and three-armed star-block copolymers of styrene and isoprene via the living anionic polymerization with control over the molecular weight and weight fractions of each block. The room temperature polymerization process has resulted in the well defined linear and radial block copolymers, when the living di-block of poly(styrene-b-isoprene) was coupled using cheap and readily available malonyl chloride as a novel coupling agent giving nearly 100% yield. The resulting block copolymers have narrow polydispersity index (PDI = 1.01–1.09) with a good agreement between the calculated and the observed molecular weights. The results are further supported by fractionation of the block copolymers by reversed-phase temperature gradient interaction chromatography (RP-TGIC) technique followed by size exclusion chromatography (SEC). © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2636–2641, 2010</P> <B>Graphic Abstract</B> <P>The three different block copolymers, di-, tri-, and three-armed star-block of styrene and isoprene were synthesized with a control in terms of their molecular weight and weight fractions through a new methodology using living anionic polymerization. Because of the abstraction of hydrogen from the active methylene group of MC by the living diblock, a new tri-functional coupling agent (MC-1) is generated in situ, and this coupling agent allows the formation of star-block copolymer as well. <img src='wiley_img_2010/0887624X-2010-48-12-POLA24044-gra001.gif' alt='wiley_img_2010/0887624X-2010-48-12-POLA24044-gra001'> </P>
Shailesh Ramakant Hadgaonkar,Ashok Kumar Shyam,Kunal Chandrakant Shah,Ketan Shripad Khurjekar,Parag Kantilal Sancheti 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.5
Osteoblastomas are bone forming lesions arising mainly from posterior elements of the vertebra. They are commonly encountered in the cervical and lumbar regions. We present a case of a thoracic osteoblastoma which is extra osseous and is not communicating with any part of the vertebra present intraforaminally. This is a rare presentation of an osteoblastoma. Imaging studies do not accurately diagnose the osteiod lesion. The size of the lesion and cortical erosion seen on the computed tomography scan help in differentiating the osteoid osteoma and osteoblastoma, but they are less sensitive and specific. Thus a histopathology is the investigation of choice to diagnose the osteoblastoma. Early and adequate removal of mass prevents malignant transformation, metastasis, and recurrence. In our case we excised the pars interarticularis unilaterally, removed the osteoid mass intact, and performed unilateral instrumented fusion. There was no recurrence and solid fusion was seen at 3 years follow up.
Mechanistic Pathway forthe Formation of Radial Polystyrenes Using Diacyl Chloride
Kumar, Santosh,Shah, Priyank N.,Ahn, Seonyoung,Hwang, Woon Sung,Sung, Ik Kyung,Shah, Shailesh R.,Murthy, C. N.,Chang, Taihyun,Lee, Jae-Suk American ChemicalSociety 2012 Macromolecules Vol.45 No.6
<P>An efficient and useful synthetic route for the synthesisof linear and star polystyrenes (PS) is described, employing livinganionic polymerization to link living polystyryl anions to inexpensiveand readily available malonyl chloride and other coupling agents withhigher functionality that were generated <I>in situ</I> atroom temperature. The polymers prepared in this way were analyzedand characterized by size-exclusion chromatography (SEC), temperaturegradient interaction chromatography (TGIC) and matrix-assisted laserdesorption/ionization time-of-flight mass spectrometry (MALDI–TOFMS). It was observed that with the increase in molecular weight ofthe living PS, the number of arms and weight fraction of higher armpolymers decrease significantly.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2012/mamobx.2012.45.issue-6/ma3002142/production/images/medium/ma-2012-002142_0005.gif'></P>
A note on generalized derivations as a Jordan homomorphisms
Arusha Chandrasekhar,Shailesh Kumar Tiwari 대한수학회 2020 대한수학회보 Vol.57 No.3
Let $R$ be a prime ring of characteristic different from $2$. Suppose that $F$, $G$, $H$ and $T$ are generalized derivations of $R$. Let $U$ be the Utumi quotient ring of $R$ and $C$ be the center of $U$, called the extended centroid of $R$ and let $f(x_1,\ldots,x_n)$ be a non central multilinear polynomial over $C$. If \begin{align*} &\ F(f(r_1,\ldots,r_n))G(f(r_1,\ldots,r_n))-f(r_1,\ldots,r_n)T(f(r_1,\ldots,r_n))\\ =&\ H(f(r_1,\ldots,r_n)^2) \end{align*} for all $r_1, \ldots, r_n \in R$, then we describe all possible forms of $F$, $G$, $H$ and $T$.
A NOTE ON GENERALIZED DERIVATIONS AS A JORDAN HOMOMORPHISMS
Chandrasekhar, Arusha,Tiwari, Shailesh Kumar Korean Mathematical Society 2020 대한수학회보 Vol.57 No.3
Let R be a prime ring of characteristic different from 2. Suppose that F, G, H and T are generalized derivations of R. Let U be the Utumi quotient ring of R and C be the center of U, called the extended centroid of R and let f(x<sub>1</sub>, …, x<sub>n</sub>) be a non central multilinear polynomial over C. If F(f(r<sub>1</sub>, …, r<sub>n</sub>))G(f(r<sub>1</sub>, …, r<sub>n</sub>)) - f(r<sub>1</sub>, …, r<sub>n</sub>)T(f(r<sub>1</sub>, …, r<sub>n</sub>)) = H(f(r<sub>1</sub>, …, r<sub>n</sub>)<sup>2</sup>) for all r<sub>1</sub>, …, r<sub>n</sub> ∈ R, then we describe all possible forms of F, G, H and T.