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Quality Assessment of Surface and Drinking Water of Nakla Paurosova, Sherpur, Bangladesh

Advances in Microbiology 2019年第8期9卷 703-727页

作者： Sourav Sarker Shahin Mahmud Razia Sultana ritu biswas Partha Protim Sarkar Md. Abul Munayem Nur-E-Alam Md. Rayhan Ali Muhammad Wasim Md. Firoz Ali Md. Omar Faruque Fatematuz Zuhura Evamoni Department of Biotechnology and Genetic Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh Department of Biotechnology and Genetic Engineering Noakhali Science and Technology University Noakhali Bangladesh Department of Biotechnology and Genetic Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj Bangladesh Department of Biotechnology Bangladesh Agricultural University Mymensingh Bangladesh

Water is one of the most vital elements of ecosystem and human being, but unfortunately nowadays, the pollution of surface and drinking water is an alarming problem. The present work deals with the assessment of physicochemical and bacteriological profile of several pond, jar and tube-well water samples to ensure its suitability for using and drinking. Total 30 samples were randomly selected and collected from Nakla Paurosova of Sherpur district by following the standard procedure. Bacteriological analysis was carried out by following the standard bacteriological methods. Most of the surface water sampling points were polluted by dumping of waste, cattle wash and were not suitable for drinking or other domestic purposes. Among three heavy metals, only Iron was detected in six tube-well water samples, one was also positive to arsenic, rest of the water bodies were negative to all of these metals. In case of most of the water bodies, different physicochemical properties were below standard limit. In pond water, the Total Viable Count (TVC) ranged from 2.7 × 107 cfu/100ml to 4.4 × 1015 cfu/100ml and Total Coliform Count (TCC) were 3.4 × 105 cfu/100ml to 4.8 × 1013 cfu/100ml, where the mean concentration of Heterotrophic Plate Count (HPC) was 2.4 × 105 cfu/100ml and 1.8 × 105 cfu/100ml in jar and tube-well water respectively. On the other hand, the Total Coliform Count of supply water was 33 cfu/100ml and tube-well water was 14 cfu/100ml. Fecal coliform was detected in all of the pond water samples, four jar and three tube-well water too. E. coli was present in all pond water samples, and also detected in 80% supply and 50% tube-well water also. Shigella spp. was found in two pond water and in one supply water, where tube-well water was free from it. Salmonella spp. was also detected in 30% of pond and 20% of supply water, whereas absent in tube-well water. 50% of pond, 40% of supply and 30% of tube-well water were contaminated with Vibrio spp. The total counts of these

关键词： Physiochemical Parameters Bacterial Load Antibiogram Public Health Nakla Paurosova

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Preventive treatments for the invasion of Leucanthemum vulgare Lam.:exploring effects in rangeland ecosystems of Iran

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Journal of Mountain Science 2025年第1期22卷 246-259页

作者： Mehdi MOAMERI Sahar SAMADI KHANGHAH Ardavan GHORBANI Raoof MOSTAFAZADEH Abazar ESMALI OURI Asim biswas Department of Plant Sciences and Medicinal Plants Meshginshahr Faculty of AgricultureMember of Water Management Research CenterUniversity of Mohaghegh ArdabiliArdabil ***Iran Department of Range and Watershed management Faculty of Agriculture and Natural ResourcesUniversity of Mohaghegh ArdabiliArdabil ***Iran School of Environmental Sciences University of GuelphOntario N1G 2W1Canada

Invasive species are increasingly spreading,particularly in rangeland *** is essential to evaluate the effectiveness of different methods for controlling invasive plants in these *** study aimed to investigate the effects of three strategies-21-year grazing exclusion(21-YES),mowing-grazing in rotation in alternate years(MGRS),and moderate grazing(MGS)-on the change in cover,density,and biomass of Leucanthemum vulgare Lam.(Ox-eye Daisy=OED)and the plant *** accomplish this,three sites selected for each *** 2021,270 vegetation plots were sampled using a random systematic ***,we recorded the density and canopy cover of all growth forms(forbs,grasses,and ferns),the OED biomass,and the ground *** results indicated that MGS reduced OED density,OED canopy,and OED ***,this strategy demonstrated the highest density and canopy cover of the plant community(including total,forbs,grasses,and ferns).Additionally,the strongest correlation was observed between the total canopy and the OED density(R2=-0.91,-0.95,-0.94 in 21-YES,MGRS,and MGS,respectively),as well as between the total canopy and the OED canopy(R2=-0.51,-0.98,-0.97 in 21-YES,MGRS,and MGS,respectively).The MGS led to an increase in diversity *** general,the grazing strategy has proven to be effective in controlling the spread of invasive OED and has also resulted in an increase in canopy cover,density,and diversity indices of the plant *** study highlights the importance of ongoing management efforts to control invasive species,with moderate grazing potentially serving as a more practical,culturally accepted,and costeffective short-term control strategy for widespread rangeland weed infestations.

关键词： Grazing Leucanthemum vulgare Leucanthemum vulgare Canopy cover Growth forms Biomass

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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

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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

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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

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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

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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

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Assessing the role of active case detection on visceral leishmaniasis control:A case study

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International Journal of Biomathematics 2024年第7期17卷 111-142页

作者： Santanu biswas Department of Basic Science and Humanities University of Engineering Management Kolkata West BengalIndia

In this paper,we formulate and analyze a compartmental model of visceral leishmaniasis(VL).We validate our model by calibrating it to the yearly VL incidence data for India and *** proposed model's basic reproduction number(R_(0))has been derived and *** have proved the existence of backward bifurcation in our *** phenomenon of backward bifurcation has public health implications because the classical requirement of R_(0)<1,while necessary,is no longer sufficient for effective disease control(or elimination).In such a(backward bifurcation)situation,the initial sizes of the model's subpopulations(state variables)would determine the effectiveness of disease control or *** a result,it is the first attempt to represent and study VL disease dynamics using active case detection(ACD)as a control strategy,although a few experimental studies have been conducted to evaluate ACD in disease *** use sensitivity analysis to investigate the effects of the model's controllable parameters for the basic reproduction *** found that σ1,σ2,σ3(monitoring rate to infected individuals)have negative impacts on R_(0).The numerical result suggests that the ACD strategy can be useful for the VL elimination *** to a small increment in the monitoring rate,the dynamic behavior of infected individuals dramatically *** employment of ACD strategy may reduce more than 60-80%symptomatic and post kala-azar dermal leishmaniasis(PKDL)*** found that healthcare organizations should prioritize ACD in symptomatic and PKDL individuals over asymptomatic *** also observed that the use of only culling effect to the reservoirs is not beneficial to society in the control of VL,but spraying of insecticides and the use of treated bednets can be effective control strategies to curtail the outbreak of the disease.

关键词： Visceral leishmaniasis basic reproduction number backward bifurcation numerical simulation

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Anisotropic compressive deformation behavior of hot-rolled Mg-3Al-0.5Ce alloy

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Journal of Magnesium and Alloys 2024年第11期12卷 4646-4666页

作者： Prakash C.Gautam Somjeet biswas Light Metals and Alloys Research Lab Department of Metallurgical and Materials EngineeringIndian Institute of Technology Kharagpur Institut für Metallkunde und Materialphysik (IMM) Rheinisch-Westf?lische Technische Hoschule Aachen

This work investigates the anisotropic compressive deformation of hot-rolled Mg-3Al-0.5Ce alloy and correlates it with microstructure and ***-rolled alloy had elongated and equiaxed grains with long-aligned Al11Ce3precipitates within the grain boundaries along rolling direction （RD） and basal texture along normal direction （ND）.Analytical and crystal plasticity-based viscoplastic self-consistent predominant twin reorientation （VPSC-PTR） approaches were employed to simulate the flow curve and texture evolution for deeper insight into the deformation *** compression direction （CD）∥to RD and transverse direction （TD）,the basal texture was～⊥to CD which favored■extension twins （ET）.The ETs nucleate,broaden and engulf the parent matrices with strain,rotating the lattice by～86.4?about■axes to a geometrically hard orientation with c-axis～∥to CD,leading to sigmoidal flow and increasing stage-II strain hardening rate （SHR）.However,Al11Ce3weakened the basal texture intensity,reducing the stage-II strain hardening compared to the single-phase Mg alloy investigated *** presence of Al11Ce3intermetallics delayed the ET nucleation event,which initiates atε～*** ET fraction evolves to～0.85,lower than in the previous works on single phase Mg alloy.A reduction in the+ve SHR slope could be observed from ε=0.03 to 0.06,indicating increased slip activities in this portion of *** ε=0.1,decreasing stage-III SHR was observed due to basal?a?,and pyr?c+a?-I and II slip activities in the ET *** difference in the compressive behavior along RD and TD could not be observed due to Al11Ce3precipitate’s morphology with elongation along *** CD∥to ND,the compressive flow behavior was parabolic with decreasing SHR due to slip-based *** didn’t form,and the texture change was negligible,with initial and final textures having basal texture～∥to CD,the geometrically hard orientation.

关键词： Mg-3Al-0.5Ce alloy Compressive behavior Texture Extension twins Anisotropy Strain hardening

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Twinning mediated anisotropic fracture behavior in bioimplant grade hot-rolled pure magnesium

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Journal of Magnesium and Alloys 2024年第9期12卷 3806-3822页

作者： Prakash C.Gautam Somjeet biswas Light Metals and Alloys Research Lab Department of Metallurgical and Materials EngineeringInstitute of Technology KharagpurKharagpurWest Bengal 721302India Institut für Metallkunde und Materialphysik(IMM) Rheinisch-Westfälische Technische Hoschule AachenAachen 52074Germany

Bioimplant grade hot-rolled magnesium with equiaxed microstructure and basal texture was examined for fracture toughness(FT)anisotropy using fatigue pre-cracked single-edge notch bending specimens with the notch,an||,⊥and 45°to rolling direction(RD).Due to adequate crack-tip plasticity,the size-independent elastic-plastic fracture toughness(JIC)were *** JIC was ob-served due to different twin lamellae formation *** owing to the initial basal texture with{10¯10}and{11¯20}poles mostlyand⊥to *** out-of-plane tensile stresses activated the{10¯12}||10¯11||extension twins(ET)as usual with matrix-ET∑15b coincident site lattice boundary(CSLB)*** the in-plane tensile stress⊥to the crack-tip activated{10¯11}||10¯12||contraction twins(CT)that transform into{10¯11}-{10¯12}double twins(DT)with matrix-DT∑23b and∑15a *** an||RD,large DT lamellae fraction formed at∼30°and few ETs at∼30°and∼90°to the notch with crack growth mainly via the∑23b/∑15a CSLB interfaces during ***,significant DT and ET lamellae developed at∼0°and∼60°with cracking via the matrix-DT∑23b/∑15a and matrix-ET||15b CSLBs for an⊥*** DT and ET lamellae activated at∼15°,and the crack propagated through∑15b for an∼45°to *** JIC and the crack-tip plastic zone decreases,while the elastic component of the J-integral(Jel)and the ET formation increases from an||,⊥,to∼45°to *** strain incompatibility of matrices was higher with the geometrically hard ETs than ***,brittle interlamellar cracking occurred through the∑15b *** contrast,almost similar and higher crack-tip plasticity occurred in matrix and DT domains during crack propagation via||23b/||15a *** growth through∑23b/||15a led to high JIC,both∑15b and||23b/||15a led to moderate JIC,and∑15b least JIC for an||,⊥and 45°to RD,respectively.

关键词： Magnesium Elastic-plastic fracture toughness Twins Texture Strain incompatibility

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