Photosynthesis and Water-Use Characteristics in Indian Mangroves

Paramita Nandy 한국식물학회 2005 Journal of Plant Biology Vol.48 No.2

Pervaporative recovery of tetrahydrofuran from water with plasticized and filled polyvinylchloride membranes

Paramita Das,Samit Kumar Ray 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-

Plasticized polyvinyl chloride (PPVC) membranes were prepared by incorporating 20, 25 and 30 wt% ofdioctyl phthalate (DOP) plasticizer in the matrix of PVC. Filled PPVC membranes were prepared byincorporating 1, 2 and 3 wt% bentonite clay in the PPVC membrane containing 25 wt% of DOP. Themembranes were characterized by FTIR, DTA-TG, XRD, SEM and mechanical properties. Thesemembranes were used for sorption and pervaporation of 1–18 wt% tetrahydrofuran (THF) in water. Thepreferential sorption of the organophilic membranes were analyzed in terms of thermodynamicinteraction parameters. The permeability and the diffusion coefficient of the solvents were determined.

Mathematical modeling of supercritical carbon dioxide extraction of methyl eugenol from tuberose flowers

Paramita Bhattacharjee,Probir Kumar Ghosh 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.5

Methyl eugenol-rich extracts from dried tuberose flowers (Polianthes tuberosa L.) of Calcutta single variety were obtained using supercritical carbon dioxide (SC-CO2) extraction. The optimized conditions for highest yield of methyl eugenol were 50 oC, 300 bar, 135 min with 1 L min−1 flow rate of gaseous CO2. Solubilities of methyl eugenol under different SC-CO2 extraction conditions were evaluated by Hildebrand solubility parameter and Chrastil equation. The extraction curve of methyl eugenol followed plug flow model. Steady state extraction occurred up to 100min, followed by unsteady state. Release of methyl eugenol from tuberose flowers followed first-order kinetics (Peppas model) and non-Fickian diffusion. Packed bed characterization was carried out using dimensionless numbers of mass transfer, considering steady and unsteady states of extraction. These findings could be used in the development of the pilot plant and commercial scale extraction of methyl eugenol from floral matrices.

Accounting Earnings Response Coefficient: Is the Earning Response Coefficient Better or Not

PARAMITA, Ratna Wijayanti Daniar,FADAH, Isti,TOBING, Diana Sulianti K.,SUROSO, Imam Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10

The study aims to compare whether using Earnings Response Coefficient (ERC) is better than using the new concept of Accounting Earnings Response Coefficient (AERC) in determining the earnings quality response coefficient value. Also, the study seeks to explain the effect of company characteristics and corporate governance on AERC through voluntary disclosure and information asymmetry. Research samples include 69 manufacturing companies listed on the Indonesian Stock Exchange over the period 2014-2017. The data come from annual reports, stock market prices, CSPI, EPS, stock returns and market returns. The research model is tested using the structural equation model (SEM) with partial least square (PLS). The results showed the value of the earnings response coefficient produced by AERC and ERC was different. Earnings quality resulting from AERC regression by adding CFO values better reflects the actual earnings quality. These results are consistent with the concept built from the proposition about earnings quality at AERC, that quality earnings are informative accounting earnings. The theoretical findings of this study provide an explanation that operational cash flow plays a role in evaluating earnings quality, while providing reinforcement that the ERC regression model fails to detect stock market reactions to information relevant to the aggregated values of accounting earnings.

Photosynthesis and Water-Use Efficiency of Some Mangroves from Sundarbans, India

Nandy, Paramita,Ghose, Monoranjan 한국식물학회 2001 Journal of Plant Biology Vol.44 No.4

We studied seasonal fluctuations in the rates of photosynthesis, transpiration, PAR, and stomatal conductance for 16 species of true mangroves from the Sundarbans region of West Bengal. Soil salinity and pH were also measured. Leaf temperatures were almost always higher than the ambient temperature. We observed considerable seasonal (summer vs winter) as well as interspecific variations in photosynthesis, with the highest rates occurring in Heritiera fomes (13.21μ㏖ m^-2 s^-1) and Avicennia marina (11.8μ㏖ m^-2 s^-1), and the lowest in Nypa fruticans (1.56μ㏖ m^-2 s^-1) and Ceriops decandra (2.32μ㏖ m^-2 s^-1). In many species, an abrupt rise in leaf temperature retarded the photosynthetic process. In winter, the rate of transpiration and stomatal conductance reached their maxima in A. marina (4.83m㏖ m^-2 s^-1 and 124.23 m㏖ m^-2 s^-1, respectively) and their mimima in Excoecaria agallocha (1.85m㏖ m^-2 s^-1 and 49.19m㏖ m^-2 s^-1, respectively). In contrast, the maximum summer readings were recorded in E. agallocha (6.07m㏖ m^-2 s^-1 and 192.74m㏖ m^-2 s^-1 respectively).

Horizontal pullout capacity of a group of two vertical plate anchors in clay

Bhattacharya, Paramita,Kumar, Jyant Techno-Press 2013 Geomechanics & engineering Vol.5 No.4

The horizontal pullout capacity of a group of two vertical strip plate anchors, placed along the same vertical plane, in a fully cohesive soil has been computed by using the lower bound finite element limit analysis. The effect of spacing between the plate anchors on the magnitude of total group failure load ($P_{uT}$) has been evaluated. An increase of soil cohesion with depth has also been incorporated in the analysis. For a weightless medium, the total pullout resistance of the group becomes maximum corresponding to a certain optimum spacing between the anchor plates which has been found to vary generally between 0.5B and B; where B is the width of the anchor plate. As compared to a single plate anchor, the increase in the pullout resistance for a group of two anchors becomes greater at a higher embedment ratio. The effect of soil unit weight has also been analyzed. It is noted that the interference effect on the pullout resistance increases further with an increase in the unit weight of soil mass.

Pullout capacity of shallow inclined anchor in anisotropic and nonhomogeneous undrained clay

Bhattacharya, Paramita Techno-Press 2017 Geomechanics & engineering Vol.13 No.5

This study aimed to find out the pullout capacity of inclined strip anchor plate embedded in anisotropic and nonhomogeneous fully saturated cohesive soil in undrained condition. The ultimate pullout load has been found out by using numerical lower bound finite element analysis with linear programming. The undrained pullout capacity of anchor plate of width B is determined for different embedment ratios (H/B) varying from 3 to 7 and various inclination of anchor plates ranging from $0^{\circ}$ to $90^{\circ}$ with an interval of $15^{\circ}$. In case of anisotropic fully saturated clay the variation of cohesion with direction has been considered by varying the ratio of the cohesion along vertical direction ($c_v$) to the cohesion along horizontal direction ($c_h$). In case of nonhomogeneous clay the cohesion of the undrained clay has been considered to be increased with depth below ground surface keeping $c_v/c_h=1$. The results are presented in terms of pullout capacity factor ($F_{c0}=p_u/c_H$) where $p_u$ is the ultimate pullout stress along the anchor plate at failure and $c_H$ is the cohesion in horizontal direction at the level of the middle point of the anchor plate. It is observed that the pullout capacity factor increases with an increase in anisotropic cohesion ratio ($c_v/c_h$) whereas the pullout capacity factor decreases with an increase in undrained cohesion of the soil with depth.

Improvement in uplift capacity of horizontal circular anchor plate in undrained clay by granular column

Bhattacharya, Paramita,Roy, Anamitra Techno-Press 2016 Geomechanics & engineering Vol.10 No.5

A numerical study has been conducted to examine the improvement achieved in the ultimate pullout capacity of horizontal circular anchor plates embedded in undrained clay, by constructing granular columns of varying diameter over the anchor plates. The analysis has been carried out by using lower bound theorem of limit analysis and finite elements in combination with linear programming. The improvement in uplifting capacity of anchor plate is expressed in terms of an efficiency factor (${\xi}$). The efficiency factor (${\xi}$) has been defined as the ratio of ultimate vertical pullout capacity of anchor plate having diameter D embedded in soft clay reinforced by granular column to the vertical pullout capacity of the anchor plate with same diameter D embedded in soft clay only. The variation of efficiency factor (${\xi}$) for different embedment ratios and different diameter of granular column has been studied considering a wide range of softness of clay and different value of soil internal friction angle (${\phi}$) of the granular material. It is observed that ${\xi}$ increases with an increase in diameter of the granular column ($D_t$) and increase in friction angle of granular material. Also, the effectiveness of the usage of granular column increases with decrease in cohesion of the clay.

Uplift capacity of horizontal anchor plate embedded near to the cohesionless slope by limit analysis

Bhattacharya, Paramita,Sahoo, Sagarika Techno-Press 2017 Geomechanics & engineering Vol.13 No.4

The effect of nearby cohesionless sloping ground on the uplift capacity of horizontal strip plate anchor embedded in sand deposit with horizontal ground surface has been studied numerically. The numerical analysis has been carried out by using the lower bound theorem of limit analysis with finite elements and linear optimization. The results have been presented in the form of non-dimensional uplift capacity factor of anchor plate by changing its distance from the slope crest for different slope angles, embedment ratios and angles of soil internal friction. It has been found that the decrease in horizontal distance between the edge of the anchor plate and the slope crest causes a continuous decrease in uplift capacity of anchor plate. The optimum distance is that distance between slope crest and anchor plate below which uplift capacity of an anchor plate has been found to decrease with a decrease in normalized crest distance from the anchor plate in presence of nearby sloping ground. The normalized optimum distance between the slope crest and the anchor plate has been found to increase with an increase in slope angle, embedment ratio and soil internal friction angle.

Tetra Primer ARMS PCR Optimization to Detect Single Nucleotide Polymorphisms of the CYP2E1 Gene

Suhda, Saihas,Paramita, Dewi Kartikawati,Fachiroh, Jajah Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.7

Single nucleotide polymorphism (SNP) detection has been used extensively for genetic association studies of diseases including cancer. For mass, yet accurate and more economic SNP detection we have optimized tetra primer amplification refractory mutation system polymerase chain reaction (ARMS PCR) to detect three SNPs in the cytochrome P450 2E1 (CYP2E1) gene locus; i.e. rs3813865, rs2070672 and rs3813867. The optimization system strategies used were (1) designing inner and outer primers; (2) determining of their optimum primer concentration ratios; and (3) determining of the optimum PCR annealing temperature. The tetra primer ARMS PCR result could be directly observed using agarose gel electrophoresis. The method succesfully determined three SNPs in CYP2E1 locus, the results being consistent with validation using DNA sequencing and restriction fragment length polymorphisms (RFLP).