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Interface of Korean Culture and the Contours of Sacred-space
Das,A. K. 한국박물관학회 2008 博物館學報 Vol.- No.14·15
In the year 2006 the UNESCO conducted a world-wide survey particularly in areas known for the traditional way of life specifically in the Asia-Pacific region to collect data on the dying traditions. The data bank on this aspect would reveal a large body of traditions in Asia both tangible and intangible are either dying or struggling for survival. In India. China. Korea and the countries of South-east Asia many a form of arts and crafts. traditions. customs. rites . rituals. songs . dances. performances. ceremonies. languages and dialects so on and so forth are fast on the wane. The change is inevitable in terms of social. cultural and economic development. It is part and parcel of human life and history. Yet certain value and finer sides of life needs continuity to sustain cultural identity. In this context the relevance of the heritage conservation has been accepted world over. The stipulations of the UNESCO Conventions on the Safeguard of Tangible and the Intangible Human Heritage' (2003) are a matter of great concern to the modern and traditional societies. ll In this context it may be mentioned that the tangible heritages have been well looked after in highly industrialized countries like Korea and Japan in East Asia. However. preservation of intangible heritage here needs some attention. National cultural identity inherent in ways of human life is represented by the tangible and the intangible elements that are subjected to change. However. the significance of the intangible heritage lies in the fact that it carry forward past to the present in a dynamic form.
Papita Das Saha,Shamik Chowdhury,Siddhartha Datta,Shyamal K Sanyal 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.8
The feasibility of applying natural, untreated clayey soil as low-cost alternative adsorbent for Pb(II) removal from aqueous solutions was investigated with a batch experimental set-up. Experiments were carried out as a function of initial solution pH (1-8), contact time (10-360 min), initial Pb(II) concentration (20-100 mg L−1), adsorbent dose (0.5-5 g) and temperature (303-333 K). Adsorption equilibrium data were well described by the Langmuir isotherm with maximum adsorption capacity of 121.86 mg g−1 at 303 K. Adsorption of Pb(II) followed pseudo-second-order kinetics. Gibbs free energy (ΔG0) was spontaneous for all interactions, and the adsorption process exhibited exothermic enthalpy values. The adsorbent was easily regenerated by using 0.1M HNO3 solution and was reused for five sorptiondesorption cycles without any considerable loss in adsorption capacity. It could be concluded that clayey soil may be used as an inexpensive and effective adsorbent without any treatment or any other modification for the removal of Pb(II)ions from aqueous solutions.
( Venugopalan vijayalatha ),( Subhash K Tripathi ),( Pradip Nahar ),( P Pardha Saradhi ),( Rakha H Das ),( Hemant K Gautam ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.2
Canthaxanthin (cx) is a potent antioxidant that is chemically synthesized at the industrial scale and has imperative applications in the cosmetic and feed industries. An orange pigmented mesophilic bacterium, designated as K44, was isolated from soil samples of Kargil, India. Biochemical tests, 16S rRNA gene sequencing, and FAME analysis of the bacterium indicated it to belong in the genus Dietzia and is distinct from human isolates. The strain showed 98% 16S rRNA gene sequence homology with Dietzia maris DSM 43102. High-performance liquid chromatography profile of the pigments isolated from K44 showed two major peaks absorbing at 465.3 and 475 nm. The liquid chromatography-mass spectrometry (LC-MS) analysis of both these peaks revealed their m/z to be 564. The molecular weights, LC-MS/MS fragmentation patterns, and λ max of these fractions corresponded to all-trans- (475 nm) and 9-cis-(465.3 nm) cx isomers. The antioxidant activities of cis- and trans-cx isomers isolated from this bacterium were found to differ, where the cis-isomer showed higher free radical, superoxide radical, and reactive oxygen species scavenging activities than the alltrans- isomer, suggesting that 9-cis-cx is more effective as an antioxidant than the all-trans-cx.
Some results on the Laplacian spread of a graph
Chen, X.,Ch. Das, K. North Holland [etc.] 2016 Linear algebra and its applications Vol.505 No.-
<P>The Laplacian spread of a graph G with n vertices is defined to be s(L)(G) = mu(1)(G) mu(n-1)(G), where mu(1)(G), mu(n-1)(G) are the largest and the second smallest Laplacian eigenvalues of G, respectively. It is conjectured that s(L) (G) <= n - 1. In this paper, we first establish a new sharp upper bound for s(L) (G), and then use it to prove that the conjecture is true for t-quasi regular graphs when t <= root n - 3 + 2/n. We also present some other partial solutions for this conjecture; in particular, we show that the conjecture holds for K-3-free graphs. Finally, we give several sharp lower bounds for s(L)(G) as well. (C) 2016 Elsevier Inc. All rights reserved.</P>
Reverse Bias Leakage Current Mechanism of AlGaN/InGaN/GaN Heterostructure
Apurba Chakraborty,Saptarsi Ghosh,Partha Mukhopadhyay,Sanjay K. Jana,Syed Mukulika Dinara,Ankush Bag,Mihir K. Mahata,Rahul Kumar,Subhashis Das,Palash Das,Dhrubes Biswas 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.2
The reverse bias leakage current mechanism of AlGaN/InGaN/GaNheterostructure is investigated by current-voltage measurement intemperature range from 298 K to 423 K. The Higher electric field acrossthe AlGaN barrier layer of AlGaN/InGaN/GaN double heterostructuredue to higher polarization charge is found to be responsible for strongFowler-Nordheim (FN) tunnelling in the electric field higher than3.66 MV/cm. For electric field less than 3.56 MV/cm, the reverse biasleakage current is also found to follow the trap assisted Frenkel-Poole(FP) emission in low negative bias region. Analysis of reverse FPemission yielded the barrier height of trap energy level of 0.34 eV withrespect to Fermi level.
Highly Efficient Photocatalytic Studies on Bi36 Fe2 O57 Ceramic Synthesized by Chemical Route
Manish Kumar Verma,Vinod Kumar,Upakar Patel,Vishnu Shankar Rai,Anup Kumar,Arup Kumar De,Aditya Kumar Prajapati,Dinesh Prajapati,Kedar Sahoo,Tapas Das,N. B. Singh,K. D. Mandal 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.5
Bi36 Fe2 O57 (BFO) polycrystalline ceramic was synthesized by economical chemical route. The single-phase formation of BFO ceramic was confirmed by powder X-ray diffraction studies. Nanosized formation of BFO ceramics established by XRD and TEM analysis. The bimodal distribution of grain size is observed with size ranging from 50 to 600 nm. It observed that the Bi36 Fe2 O57 photocatalyst exhibited higher catalytic activity for the degradation of Methylene Blue (MB) under visible-light irradiation The oxidation state of elements present in the BFO ceramic, was confirmed by XPS studies. The pseudocapacitive nature of BFO ceramic was observed by cyclic Voltammetry. The dielectric constant of BFO ceramic was found 375 at 1 kHz at 300 K. The dielectric loss was found 0.51 at 100 kHz and 300 K.
Remoteness and distance eigenvalues of a graph
Lin, H.,Das, K.Ch.,Wu, B. North Holland ; Elsevier Science Ltd 2016 Discrete Applied Mathematics Vol.215 No.-
<P>Let G be a connected graph of order n with diameter d. Remoteness rho of G is the maximum average distance from a vertex to all others and partial derivative(1) >= ... >= partial derivative(n) are the distance eigenvalues of G. Aouchiche and Hansen (0000), Aouchiche and Hansen conjectured that rho + partial derivative(3) > 0 when d >= 3 and rho + partial derivative(left perpendicular7d//right perpendicular) > 0. In this paper, we confirm these two conjectures. Furthermore, we give lower bounds on partial derivative(n) + rho and partial derivative(1) - rho when G not congruent to K-n and the extremal graphs are characterized. (C) 2016 Elsevier B.V. All rights reserved.</P>
Upper bounds on the (signless) Laplacian eigenvalues of graphs
Das, K.Ch.,Liu, M.,Shan, H. North Holland [etc.] 2014 Linear algebra and its applications Vol.459 No.-
Let G be a simple graph of order n with vertex set V={v<SUB>1</SUB>,v<SUB>2</SUB>,...,v<SUB>n</SUB>}. Also let μ<SUB>1</SUB>(G)≥μ<SUB>2</SUB>(G)≥...≥μ<SUB>n-1</SUB>(G)≥μ<SUB>n</SUB>(G)=0 and q<SUB>1</SUB>(G)≥q<SUB>2</SUB>(G)≥...≥q<SUB>n</SUB>(G)≥0 be the Laplacian eigenvalues and signless Laplacian eigenvalues of G, respectively. In this paper we obtain μ<SUB>i</SUB>(G)@?i-1+min<SUB>U'i</SUB>@?max@?{|N<SUB>H</SUB>(v<SUB>k</SUB>)@?N<SUB>H</SUB>(v<SUB>j</SUB>)|:v<SUB>k</SUB>v<SUB>j</SUB>@?E(H)}, where N<SUB>H</SUB>(v<SUB>k</SUB>) is the set of neighbors of vertex v<SUB>k</SUB> in V(H)=V(G)\U<SUB>i</SUB>, U<SUB>i</SUB> is any (i-1)-subset of V(G) (here, we agree that i@?{1,...,n-1} and μ<SUB>i</SUB>(G)@?i-1 if E(H)=&n.diameter;). For any graph G, this bound does not exceed the order of G. Moreover, we prove thatmax@?{μ<SUB>i</SUB>(G),q<SUB>i</SUB>(G)}@?maxi@?k@?n@?{d<SUB>G</SUB>(v<SUB>k</SUB>)+@?v<SUB>j</SUB>@?N<SUB>G</SUB>(v<SUB>k</SUB>)@?Nd<SUB>G</SUB>(v<SUB>j</SUB>)d<SUB>G</SUB>(v<SUB>k</SUB>)}@?2d<SUB>G</SUB>(v<SUB>i</SUB>), where d<SUB>G</SUB>(v<SUB>i</SUB>) is the i-th largest degree of G and N={v<SUB>i</SUB>,v<SUB>i+1</SUB>,...,v<SUB>n</SUB>}.
Das, Subhasish,Teja, K. Charan,Mukherjee, Sandip,Seal, Soma,Sah, Rajesh Kumar,Duary, Buddhadeb,Kim, Ki-Hyun,Bhattacharya, Satya Sundar Elsevier 2018 Environmental research Vol.161 No.-
<P><B>Abstract</B></P> <P>Carlinoside is a unique compound well-known for its excellent curative potential in hepatitis. There is a substantial research gap regarding the medicinal use of carlinoside, as its concentrations are greatly variable (depending on locality). We cultivated <I>Cajanus cajan</I> using vermicompost as a major organic amendment at two locations (Sonitpur and Birbhum) with different soil types, but identical climate conditions. Sonitpur soils were richer in soil organic C (SOC), enzyme activation, and N/P content than Birbhum. However, vermi-treatment improved many soil properties (bulk density, water retention, pH, N/P/K, and enzyme activity) to narrow the locational gap in soil quality by 15–28%. We also recorded a many-fold increment in SOC storage capacities in both locations, which was significantly correlated with carlinoside, total phenol, and flavonoid contents in <I>Cajanus</I> leaves. This significantly up-regulated the carlinoside induced expression of the bilirubin-solubilizing UGT1A1enzyme in HepG2 cell and rat liver. Leaf extracts of vermicompost-aided plants could cure hepatitis in affected rat livers and in the HepG2 cell line. Accordingly, vermi-treatment is an effective route for the growth of <I>Cajanus</I> as a cash crop for biomedical applications and can produce a concurrent improvement in soil quality.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Soil organic C primarily induces carlinoside biosynthesis in <I>Cajanus cajan</I>. </LI> <LI> Vermicompost elevates the medicinal value of <I>Cajanus cajan</I> against hepatitis. </LI> <LI> Vermi-treated <I>Cajanus</I> yield carlinoside stably irrespective of growing location. </LI> <LI> Vermi-treated leaf extracts expedited bilirubin solubilization in rat liver. </LI> </UL> </P>