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Modified Differential Transform Method (DTM) Simulation of Hydromagnetic Multi-Physical Flow Phenomena from a Rotating Disk

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World Journal of Mechanics 2011年第5期1卷 217-230页

作者： Mohammad Mehdi Rashidi Esmael Erfani Osman Anwar Bég swapan kumar Ghosh 不详

A similarity solution for the steady hydromagnetic convective heat and mass transfer with slip flow from a spinning disk with viscous dissipation and Ohmic heating yields a system of non-linear, coupled, ordinary differential equations. These equations are analytically solved by applying a newly developed method namely the DTM-Padé technique which is a combination of the Differential Transform Method (DTM) and the Padé approximation. A full analytical solution is presented, as a benchmark for alternative numerical solutions. DTM-Padé is implemented without requiring linearization, discretization, or perturbation, and holds significant potential for solving strongly nonlinear differential equations which arise frequently in fluid dynamics. The regime studied is shown to be controlled by the slip parameter (γ), magnetohydrodynamic body force parameter (M), Eckert (viscous heating) number (Ec), Schmidt number (Sc), Soret number (Sr), Dufour number (Du) and Prandtl number (Pr). The influence of selected parameters on the evolution of dimensionless velocity, temperature and concentration distributions is studied graphically. Increasing magnetic field (M) is found to significantly inhibit the radial (f) and tangential (g) velocities, but to accentuate the axial velocity field (h);furthermore temperature (θ) and concentration (φ) are both enhanced with increasing M. Increasing Soret number (Sr) acts to boost the dimensionless concentration (φ). Temperatures are significantly elevated in the boundary layer regime with a rise in Eckert number (Ec). Excellent correlation between the DTM-Padé technique and numerical (shooting) solutions is achieved. The model has important applications in industrial energy systems, process mechanical engineering, electromagnetic materials processing and electro-conductive chemical transport processes.

关键词： Differential Transform Method Padé Approximants Thermal-Diffusion Heat Transfer Soret Effect Boundary-Layers Hydromagnetics Slip Dissipation Electromagnetic Processing of Materials

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RNAi-Mediated Silencing of ITPK Gene Reduces Phytic Acid Content,Alters Transcripts of Phytic Acid Biosynthetic Genes,and Modulates Mineral Distribution in Rice Seeds

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Rice science 2020年第4期27卷 315-328页

作者： Aritra KARMAKAR Sananda BHATTACHARYA Shinjini SENGUPTA Nusrat ALI Sailendra Nath SARKAR Karabi DATTA swapan K.DATTA Laboratory of Translational Research on Transgenic Crops Department of BotanyUniversity of CalcuttaKolkata 700019West BengalIndia Plant Nutrition Department Centre Mondial de I’Innovation RoullierSaint Malo 35400France

Phytic acid is the principal storage form of phosphorus in plant seeds and an essential signalling molecule in several regulatory processes of plant ***,it is known as an anti-nutrient compound owing to its potent chelating ***,reducing the phytic acid content in crops is *** involving regulation of MIPS and IPK1 genes to generate low phytate rice have been reported ***,the functional significance of OsITPK and the effect of its down-regulation on phytic acid content and the associated pleiotropic effects on rice have not yet been *** this study,tissue specific RNA interference(RNAi)-mediated down-regulation of a major ITPK homolog(OsITP5/6K-1)resulted in 46.2%decrease in phytic acid content of T2 transgenic seeds with a subsequent 3-fold enhancement in the inorganic phosphorus *** of OsITP5/6K-1 altered the transcript levels of essential phytic acid pathway genes,without significantly affecting the transcript levels of other OsITPK ***,the mapping of elements through X-ray microfluorescence analysis revealed significant changes in the spatial distribution pattern and translocation of elements in low phytate ***,low phytate polished seeds exhibited 1.3-fold and 1.6-fold enhancement in iron and zinc content in the grain endosperm,*** of OsITP5/6K-1 also altered the amino acid and myo-inositol content of the transgenic *** results successfully established that RNAi-mediated silencing of OsITP5/6K-1 gene significantly reduced the phytate levels in seeds without hampering the germination potential of seeds and plant *** present study provided an insight into the mechanism of phytic acid biosynthesis pathway.

关键词： inositol triphosphate kinase-1 phytic acid mineral content RNA interference silencing X-ray microfluorescence

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Economic impact of traumatic spinal cord injuries in the United States

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Neuroimmunology and Neuroinflammation 2019年第7期6卷 1-11页

作者： Christopher H.Merritt Matthew A.Taylor Caleb J.Yelton swapan K.ray Department of Pathology Microbiologyand ImmunologyUniversity of South Carolina School of MedicineColumbiaSC 29209USA

Individuals having sustained traumatic spinal cord injury(TSCI)in the United States are living longer as compared to historical trends,thanks to an ever-evolving understanding of the nature of this *** this,multiple barriers to care for TSCI patients remain including variations in government-issued veteran insurance,privatized insurance,and among uninsured *** United States alone experiences 12,000 new TSCI cases every year,many of these are found to occur in a growing proportion of elderly *** is crucial to understand both the short-term direct costs as wells as the long-term rehabilitation costs required by these TSCI *** lifetime financial burden for those having sustained a TSCI can be immense for patients,insurance companies,and hospital systems *** those with TSCI,re-hospitalization rates are high,leading to increased healthcare resource utilization within this specific patient *** can quickly balloon into hundreds of thousands of dollars and cause a profound financial burden for these *** review article seeks to communicate an understanding of the current financial landscape surrounding TSCI *** authors will also examine the costs of acute emergency room surgical care such as American spinal injury association grade,hospital length of stay,as well as the timing delay between injury and surgical ***-term costs associated with TSCI such as rehabilitation,care of secondary comorbidities,and post-injury employment prospects will be examined as *** costs will be framed from the patient's perspective as well as from both the hospital and insurance company's *** is hoped a complete understanding as to what makes TSCI such a medically and financially burdensome injury will allow for improved healthcare resource utilization in this population.

关键词： Traumatic spinal cord injury healthcare resource American spinal injury association grade hospital length of stay rehabilitation post-injury employment

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Larvicidal and irritant activities of hexane leaf extracts of Citrus sinensis against dengue vector Aedes aegypti L.

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Asian Pacific Journal of Tropical Biomedicine 2012年第2期2卷 152-155页

作者： Radhika Warikoo Ankita ray Jasdeep Kaur Sandhu Roopa Sanial Naim Wahab Sarita kumar Department of Zoology Acharya Narendra Dev CollegeUniversity of Delhi

Objective:To assess the larvicidal and irritant activities of the hexane extracts of leaves of Citrus sinensis(***)against the early fourth instars and female adults of Aedes aegypti(***).Methods:The larvicidal potential of the prepared leaf extract was evaluated against early fourth instar larvae of *** using WHO *** mortality counts were made after 24 h and LC_(50)and LG_(50)values were *** efficacy of extract as mosquito irritant was assessed by contact irritancy ***-impregnated paper was placed on a glass plate over which a perspex funnel with a hole on the top was kept *** female adult,3-day old unfed/blood-fed,was released inside the *** 3 min of acclimatization time,the time taken for the first take-off and total number of flights undertaken during 15 min were ***:The citrus leaf extracts from hexane possessed moderate larvicidal efficiency against dengue *** bioassays resulted in an LC_(50)and LC_(90)value of 446.84 and 1370.96 ppm,respectively after 24 h of ***,the extracts were proved to be remarkable irritant against adults ***,more pronounced effects being observed on blood-fed females than unfed *** extract-impregnated paper was thus proved to be 7-11 times more irritable as compared with the control ***:The hexane extracts from *** leaves are proved to be reasonably larvicidal But remarkably irritant against dengue *** studies are needed to identify the possible role of extract as adulticide,oviposition deterrent and ovicidal *** isolation of active ingredient from the extract could help in formulating strategies for mosquito control.

关键词： Citrus Hexane Larvicide Irritancy Take-offs Citrus sinensis Aedes aegypti Larvicidal activity Irritant activity Dengue vector Mosquito control

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Effects of Hall Current and Ion-Slip on Unsteady MHD Couette Flow

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Open Journal of Fluid Dynamics 2012年第1期2卷 1-13页

作者： Nirmal Ghara Sovan Lal Maji Sanatan Das Rabindranath Jana swapan kumar Ghosh Department of Applied Mathematics Vidyasagar University Midnapore India Department of Mathematics Narajole Raj College Narajole India

The unsteady MHD Couette flow of an incompressible viscous electrically conducting fluid between two infinite non- conducting horizontal porous plates under the boundary layer approximations has been studied with the consideration of both Hall currents and ion-slip. An analytical solution of the governing equations describing the flow is obtained by the Laplace transform method. It is seen that the primary velocity decreases while the magnitude of secondary velocity increases with increase in Hall parameter. It is also seen that both the primary velocity and the magnitude of secondary velocity decrease with increase in ion-slip parameter. It is observed that a thin boundary layer is formed near the stationary plate for large values of squared Hartmann number and Reynolds number. The thickness of this boundary layer increases with increase in either Hall parameter or ion-slip parameter.

关键词： MHD Couette Flow Porous Plate Hall Current Ion-Slip Hartmann Number and Reynolds Number

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Combined Effects of Hall Current and Rotation on Unsteady Couette Flow in a Porous Channel

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World Journal of Mechanics 2011年第3期1卷 87-99页

作者： Sankar Guchhait Sanatan Das R. N. Jana swapan kumar Ghosh 不详

The combined influences of Hall currents and rotation on the MHD Couette flow of a viscous incompressible electrically conducting fluid between two infinite horizontal parallel porous plates channel in a rotating system in the presence of a uniform transverse magnetic field have been carried out. The solutions for the velocity field as well as shear stresses have been obtained for small time as well as for large times by Laplace transform technique. It is found that for large times the Hall currents accelerates primary flow whereas it retards secondary flow while the rotation retards the primary flow whereas it accelerates the secondary flow. It is also found that the velocity components converge more rapidly for small time solution than the general solution. The asymptotic behavior of the solution is analyzed for small as well as large values of magnetic parameter M2, rotation parameter K2 and Reynolds number Re. It is observed that a thin boundary layer is formed near the moving plate of the channel and the thicknesses of the layer increases with increase in either Hall parameter m or Reynolds number Re while it decreases with increase in Hartmann number M. It is interesting to note that for large values of M2 , the boundary layer thickness is independent of the rotation parameter.

关键词： MHD Couette Flow Hall Current Hartmann Number Rotation Parameter Reynolds Number And Boundary Layer

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Promising light converting BaMoO_4:Er^(3+)-Tm^(3+)-Yb^(3+) phosphors for display and optical temperature sensing

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Journal of Rare Earths 2018年第12期36卷 1256-1263页

作者： Abhishek kumar Soni Vineet kumar Rai Chemistry Division Bhabha Atomic Research Centre Laser and Spectroscopy Laboratory Department of Applied Physics Indian Institute of Technology (Indian School of Mines)

Er-Tm3+-Ybtri-doped BaMoOphosphors were synthesized by co-precipitation technique and characterized by X-ray diffraction analysis, absorption study and field emission scanning electron microscopy analysis. Upconversion as well as downconversion luminescence studies were performed by using near infrared(980 nm) and ultraviolet(380 nm) excitations. Energy level diagram, pump power dependence and colour coordinate study were utilized to describe the multicolor upconversion emission properties. Under single 980 nm diode laser excitation the dual mode sensing behaviour is realized via Stark sublevels and thermally coupled energy levels of the Tm3+ and Erions in the prepared tri-doped phosphors. A comparative fluorescence intensity ratio analysis for integrated emission intensities arising from the Stark sublevels {~1 G4(a)) and ~1 G4(b))} and thermally coupled energy levels {~2 Hand 4 S3/2} of the Tm3+ and Er3+ ions, respectively was carried out in the prepared tri-doped BaMoOphosphors. The maximum sensitivity for thermally coupled energy levels of the Er3+ and Stark sublevels of the Tm3+ ion was reported. The developed phosphors could be useful in the display devices and optical thermo metric applications.

关键词： Phosphor Optical temperature sensing Stark sublevels Thermally coupled energy levels Rare earths

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Defect induced room-temperature ferromagnetism and enhanced photocatalytic activity in Ni-doped ZnO synthesized by electrodeposition

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Chinese Physics B 2020年第10期29卷 566-572页

作者： Deepika Raju kumar Ritesh kumar Kamdeo Prasad Yadav Pratyush Vaibhav Seema Sharma Rakesh kumar Singh Santosh kumar College o f Commerce Arts and SciencePatna.BiharIndia Jaypee University o f Engineering and Technology GunaMadhya PradeshIndia Anugrah Narayan College PatnaBiharIndia Aryabhatta Knowledge University PatnaBiharIndia

Zn0.90Ni0.10O nanoparticles have been synthesized by single-bath two-electrode electrodeposition at constant voltage. X-ray diffraction, UV vis and photoluminescence studies reveal that a single-phase polycrystalline hcp wurtzite crystal structure of ZnO is evolved. The material consists of a large number of defects such as oxygen vacancy (Ov) and zinc interstitial (Zi). The magnetization study reveals that the sample exhibits room-temperature global ferromagnetism and the ferromagnetic ordering seems to be defect induced via bound magnetic polaron mechanism, and double exchange is also expected to have played role. Interesting optoelectronic properties have been found in the synthesized sample and the material seems to be a potential candidate to be used as a UV sensor. Such a transition metal doped ZnO based dilute magnetic semiconducting system exhibiting room-temperature ferromagnetism is likely to be first of its kind in the sense that such materials have not yet been reported to be synthesized by the simple method of electrodeposition to the best of our knowledge on the basis of ample literature review.

关键词： dilute magnetic semiconductors(DMS) bound magnetic polaron photoluminescence ferromagnetism

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1-Way Multihead Quantum Finite State Automata

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Applied Mathematics 2016年第9期7卷 1005-1022页

作者： Debayan Ganguly Kingshuk Chatterjee kumar Sankar ray Electronics and Communication Sciences Unit Indian Statistical Institute Kolkata India

1-way multihead quantum finite state automata (1QFA(k)) can be thought of modified version of 1-way quantum finite state automata (1QFA) and k-letter quantum finite state automata (k-letter QFA) respectively. It has been shown by Moore and Crutchfield as well as Konadacs and Watrous that 1QFA can’t accept all regular language. In this paper, we show different language recognizing capabilities of our model 1-way multihead QFAs. New results presented in this paper are the following ones: 1) We show that newly introduced 1-way 2-head quantum finite state automaton (1QFA(2)) structure can accept all unary regular languages. 2) A language which can’t be accepted by 1-way deterministic 2-head finite state automaton (1DFA((2)) can be accepted by 1QFA(2) with bounded error. 3) 1QFA(2) is more powerful than 1-way reversible 2-head finite state automaton (1RMFA(2)) with respect to recognition of language.

关键词： 1-Way Quantum Finite State Automaton (1QFA) k-Letter Quantum Finite State Automata (k-Letter QFA) 1-Way Multihead Quantum Finite State Automaton (1QFA(k)) 1-Way Deterministic 2-Head Finite State Automaton (1DFA((2)) 1-Way Reversible Multihead Finite State Automaton (1RMFA(k))

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Study of Type-B QPOs Observed in Black Hole X-ray Binary Swift J1728.9-3613

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Research in Astronomy and Astrophysics 2024年第3期24卷 1-9页

作者： Raj kumar Astrophysical Sciences Division Bhabha Atomic Research CentreMumbai 400085India Homi Bhabha National Institute Mumbai 400094India

We report the detection of type-B quasi-periodic oscillation(QPO)of the black hole X-ray binary Swift J1728.9-3613 observed by NICER during the 2019 outburst.A type-B QPO was observed for the first two days and it disappeared as flux increased,but again appeared at∼7.70 Hz when flux was dramatically *** source was found in the soft intermediate state during these *** further studied the energy dependence of the *** found that QPO was observed only for a higher energy range implying that the origin of QPO is possibly due to the corona emitting higher energy photons by the inverse Compton *** variation of spectral parameters can be explained with the disk truncation *** fractional rms was found to be monotonically increased with *** phase lag spectrum followed the“U-shaped”*** rms and phase lag spectrum are modeled and explained with the single-component Comptonization model vkompthdk.

关键词： X-rays binaries-accretion-accretion disks-X-rays individual (Swift J1728.9-3613)

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