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Preparation of Chitin-PLA laminated composite for implantable application

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Bioactive Materials 2017年第4期2卷 199-207页

作者： Romana Nasrin shanta biswas Taslim Ur Rashid Sanjida Afrin Rumana Akhter Jahan Papia Haque Mohammed Mizanur Rahman Department of Applied Chemistry and Chemical Engineering Faculty of Engineering and TechnologyUniversity of DhakaDhaka 1000Bangladesh Centre for Advanced Research in Sciences University of DhakaDhaka 1000Bangladesh

The present study explores the possibilities of using locally available inexpensive waste prawn shell derived chitin reinforced and bioabsorbable polylactic acid(PLA)laminated composites to develop new materials with excellent mechanical and thermal properties for implantable application such as in bone or dental *** at different concentration(1e20%of PLA)reinforced PLA films(CTP)were fabricated by solvent casting process and laminated chitin-PLA composites(LCTP)were prepared by laminating PLA film(obtained by hot press method)with CTP also by hot press method at 160*** effect of variation of chitin concentration on the resulting laminated composite's behavior was *** detailed physico-mechanical,surface morphology and thermal were assessed with different characterization technique such as FT-IR,XRD,SEM and *** FTIR spectra showed the characteristic peaks for chitin and PLA in the *** images showed an excellent dispersion of chitin in the films and *** analysis(TGA)showed that the complete degradation of chitin,PLA film,5%chitin reinforced PLA film(CTP2)and LCTP are 98%,95%,87%and 98%respectively at temperature of 500*** tensile strength of the LCTP was found 25.09 MPa which is significantly higher than pure PLA film(18.55 MPa)and CTP2 film(8.83 MPa).After lamination of pure PLA and CTP2 film,the composite(LCTP)yielded 0.265e1.061%water absorption from 30 min to 24 h immerse in water that is much lower than PLA and *** increased mechanical properties of the laminated films with the increase of chitin content indicated good dispersion of chitin into PLA and strong interfacial actions between the polymer and *** improvement of mechanical properties and the results of antimicrobial and cytotoxicity of the composites also evaluated and revealed the composite would be a suitable candidate for implant application in biomedical sector.

关键词： Chitin PLA LCTP composite Biomedical application Bone implants

Optimal control strategies for preventing hepatitis B infection and reducing chronic liver cirrhosis incidence

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Infectious Disease Modelling 2020年第1期5卷 91-110页

作者： Mst.shanta Khatun Md.Haider Ali biswas Mathematics Discipline Science Engineering and Technology SchoolKhulna UniversityKhulna9208Bangladesh

Advanced liver cirrhosis has become life-threatening among non-communicable diseases ***,the terminal stage of liver diseases in which the liver develops scarring as a result of various long-term continuous *** liver diseases,viral hepatitis is the major risk factor for chronic cirrhosis *** present paper demonstrates a compartmental model of chronic disease liver cirrhosis describing the transmission dynamics of this *** the Pontryagin’s maximum principle,the optimal control policies such as vaccination for hepatitis B virus and treatment of other causes of cirrhosis are adopted as control *** target of this study is to minimize the number of infected and liver cirrhotic individuals as well as the associated cost of the *** this purpose,the optimal control strategies are employed according to the underlying causes behind this *** goal is to find the strategy of preventing hepatitis B infection which is considered one of the leading causes of cirrhosis and consequently,reduction of the chronic cirrhosis *** analysis is also performed to observe the effective control among the two control *** model is investigated both analytically and numerically and the numerical simulations are carried out to illustrate the analytical *** analysis reveals that both the vaccination and treatment could be the most fruitful way to reduce the incidence of chronic liver cirrhosis.

关键词： Liver cirrhosis Hepatitis B infection Vaccination and treatment Optimal control Maximum principle Efficiency analysis

Building a resilient future:collaborative sustainability regulation

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Clean Energy 2024年第3期8卷 223-237页

作者： Jovita shanta Job Shivi Khanna Christ University BangaloreIndia School of Business and Management Christ University BangaloreIndia

The challenge of sustainability lies in achieving a balance between satisfying present needs and protecting resources for future generations with an emphasis on its three pillars-environmental,social and *** study explored sustainable development encompassing environmental,social and governance aspects along with sustainability reporting through various sustainability frameworks.A systematic review of literature for the period 2010-23 on major worldwide sustainability frameworks was conducted,by offering insights into enhancing reporting mechanisms for a sustainable *** data related to sustainability reports were obtained from the Sustainability Accounting Standards Board and International Integrated Reporting Council,which helped in examining sector and year variations across *** results reflected that mandatory sustainability disclosures help to meet the United Nations Sustainable Development Goals and global sustainability frameworks help to set standards,disseminate information and promote *** of investment,company action and sustainability organizations can lead to a sustainable global *** adoption of sustainability reporting can help organizations by fostering a proper understanding of sustainability practices,improving transparency and identifying potential business opportunities in sectors with lower *** paper provided insights into sustainability reporting published across various countries in both advanced as well as emerging and developing *** analysis showed which sectors and time periods have had the most sustainability reports and which areas needed to be targeted for action to advance sustainable development.

关键词： Environmental,Social and Governance(ESG) Sustainable Development Goals Sustainability Reporting Developing economies Advanced economies

Interpretation of residual gravity anomaly caused by simple shaped bodies using very fast simulated annealing global optimization

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Geoscience Frontiers 2015年第6期6卷 875-893页

作者： Arkoprovo biswas Department of Earth and Environmental Sciences Indian Institute of Science Education and Research(IISER) Bhopal

A very fast simulated annealing（VFSA） global optimization is used to interpret residual gravity ***,VFSA optimization yields a large number of best-fitted models in a vast model space;the nature of uncertainty in the interpretation is also examined simultaneously in the present *** results of VFSA optimization reveal that various parameters show a number of equivalent solutions when shape of the target body is not known and shape factor ＇q＇ is also optimized together with other model *** study reveals that amplitude coefficient k is strongly dependent on shape *** shows that there is a multi-model type uncertainty between these two model parameters derived from the analysis of ***,the appraised values of shape factor from various VFSA runs clearly indicate whether the subsurface structure is sphere,horizontal or vertical cylinder type ***,the exact shape factor（1.5 for sphere,1.0 for horizontal cylinder and 0.5 for vertical cylinder）is fixed and optimization process is *** fixing the shape factor,analysis of uncertainty and cross-plots shows a well-defined uni-model *** mean model computed after fixing the shape factor gives the utmost consistent *** of noise-free and noisy synthetic data as well as field data demonstrates the efficacy of the approach.

关键词： Gravity anomaly Idealized body Uncertainty VFSA Subsurface structure Ore exploration

Impact of density of coating agent on antibacterial activity of silver nanoparticle impregnated plasma treated activated carbon

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Journal of Environmental Sciences 2018年第5期30卷 136-144页

作者： Pritam biswas Rajdip BANDyopadhyaya Department of Chemical Engineering Indian Institute of Technology Bombay

To use stabilized nanoparticles（NPs） in water as disinfectants over a very long period, the amount of coating agent（for NP stabilization） needs to be optimized. To this end, silver nanoparticles（Ag-NPs） with two different coating densities of tri-sodium citrate（12.05 and46.17 molecules/nm2, respectively）, yet of very similar particle size（29 and 27 nm, respectively）were synthesized. Both sets of citrate capped NPs were then separately impregnated on plasma treated activated carbon（AC）, with similar Ag loading of 0.8 and 0.82 wt.%, respectively. On passing contaminated water（containing 10~4 CFU Escherichia coli/m L of water） through a continuous flow-column packed with Ag/AC, zero cell concentration was achieved in 22 and 39 min, with Ag-NPs（impregnated on AC, named as Ag/AC） having lower and higher coating density, respectively. Therefore, even on ensuring similar Ag-NP size and loading, there is a significant difference in antibacterial performance based on citrate coating density in Ag/*** is observed in lower coating density case, due to both：（i） higher Ag~＋ ion release from Ag-NP and（ii） stronger binding of individual Ag-NPs on AC. The latter ensures that, Ag-NP does not detach from the AC surface for a long duration. TGA-DSC shows that Ag-NPs with a low coating density bind to AC with 4.55 times higher adsorption energy, compared to Ag/AC with a high coating density, implying stronger binding. Therefore, coating density is an important parameter for achieving higher antibacterial efficacy, translating into a faster decontamination rate in experiments, over a long period of flow-column operation.

关键词： Silver nanoparticles Activated carbon Escherichia coliCitrate coating Coating density Water disinfection

Construction of Bode Envelopes Using REP Based Range Finding Algorithms

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International Journal of Automation and computing 2011年第1期8卷 112-121页

作者： P.S.V.Nataraj shanta Sondur IDP in Systems and Control Engineering Indian Institute of Technology Bombay Vivekanand Education Society's Institute of Technology

The frequency domain analysis of systems is an important topic in control theory. Powerful graphical tools exist in classic control, such as the Nyquist plot, Bode plots, and Nichols chart. These methods have been widely used to evaluate the frequency domain behavior of system. A literature survey shows that various approaches are available for the computation of the frequency response of control systems under different types of parametric dependencies, such as affine, multi-linear, polynomial, etc. However, there is a lack of tools in the literature to construct the Bode envelopes for the general nonlinear type of parametric dependencies. In this paper, we address the problem of computation of the envelope of Bode frequency response of a non-rational transfer function with nonlinear parametric uncertainties varying over a box. We propose two techniques to compute the Bode envelopes：first, based on the natural interval extensions （NIE） combined with uniform subdivision and second, based on the existing Taylor model combined with subdivision strategy. We also propose the algorithms to further speed up both methods through extrapolation techniques.

关键词： Bode envelope asymptotic expansion extrapolation methods rep interval analysis approximation technique.

Quaternary alluvial fan dynamics of the Jaldhaka basin

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Journal of Mountain Science 2022年第8期19卷 2160-2179页

作者： Adrija RAHA Mery biswas Department of Geography Presidency University86/1 College StreetKolkata-700073West BengalIndia

Across the Himalayan foreland area,alluvial fans respond to fluvial depositional landforms created by active tectonics and are incorporated within hydro-sediment *** tributary of the master stream has its water and sediment to discharge,which assists in initiating several mesolevel fans in response to the active tectonics in Jaldhaka *** the mountain front,active MBT(Main Boundary Thrust),MFT(Main Frontal Thrust)and lineaments(parallel and transverse to Himalaya)have governed the tectonically active Quaternary foreland area where numerous meso-level fans have *** study aims to estimate the tectonic activeness of each meso-fan using the morphotectonic *** tributaries of the Jaldhaka River are permuted to the recent tectonism or neotectonics to form each meso fan with its basin displaying the varying degree of their activeness and aggradation *** methods like technique for order performance by similarity to ideal solution(TOPSIS)and VIKOR(Vlse Kriterijumska Optimizacija Kompromisno Resenje)that specify multicriteria optimization and compromise solution,in Serbian have ranked the Fan 2 as mostly active and Fan 4 is comparatively tectonically *** hydro-sediment characteristics reveal the topographic spatial dynamics of Fan 4 where lobe 3 has elevated from *** XRD analysis specifies the scientific key in response to the dominance of dolomite in the aggraded elevated bed sediments carried by the Rohtikhola *** conceptual fan models of Fan 2and 4 display the fan development phases through four *** has clearly defined the extension of the fan lobes of Fan 2 and *** is summarized that within a common climatic zone and similar neo-tectonic setting,meso-level fans have differential morphotectonic signatures with dynamic aggradation processes.

关键词： Himalaya Tectonic activeness Fan dynamics Hydro sediment interaction

High performance in Zintl thermoelectrics via reduction in crystal field splitting energy

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Science China Materials 2024年第10期67卷 3424-3425页

作者： Anustoop Das Kanishka biswas New Chemistry Unit School of Advanced Materials and International Centre for Materials ScienceJawaharlal Nehru Centre for Advanced Scientific Research(JNCASR)Jakkur P.O.Bangalore 560064India

Sustainable thermoelectric materials open an avenue of emission-free as well as fast-responding recycling of energy in terms of heat to *** efficiency(η)of such conversion is primarily guided by the dimensionless the... 详细信息

关键词： splitting energy crystal

Dark Energy Accretion onto Van der Waal's Black Hole

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Communications in Theoretical Physics 2019年第2期71卷 209-219页

作者： Sandip Dutta Ritabrata biswas Department of Mathematics The University of BurdwanGolapbag Academic ComplexBurdwan-713104Purba Bard-dhamanWest BengalIndia

We consider the most general static spherically symmetric black hole metric. The accretion of the fluid flow around the Van der Waal's black hole is investigated and we calculate the fluid's four-velocity, the critical point and the speed of sound during the accretion process. We also analyze the nature of the universe's density and the mass of the black hole during accretion of the fluid flow. The density of the fluid flow is also taken into account. We observe that the mass is related to redshift. We compare the accreting power of the Van der Waal's black hole with Schwarzschild black hole for different accreting fluid.

关键词： black hole physics thermodynamics accretion disc extended Chaplygin gas