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Extreme exposure of fluoride and arsenic contamination in shallow coastal aquifers of the Ganges delta,transboundary of the Indo-Bangladesh region

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Geoscience Frontiers 2024年第1期15卷 286-303页

作者： Dipankar Ruidas Subodh Chandra Pal tanmoy biswas Asish Saha Abu Reza Md.Towfiqul Islam Department of Geography The University of BurdwanPurba BardhamanWest Bengal 713104India Department of Disaster Management Begum Rokeya UniversityRangpur 5400Bangladesh Department of Development Studies Daffodil International UniversityDhaka 1216Bangladesh

Globally,shallow aquifer groundwater(GW)has been severely affected in recent decades for both geogenic and anthropogenic *** hydro-geochemical characteristics of the GW change inconsistently with the addition of unwanted inorganic trace elements into the GW aquifer of the Indo-Bangladesh delta region(IBDR),such as arsenic(As)along with fluoride(F-)*** GW can have a negative impact on drinking water supplies and agricultural *** pollution can have serious adverse effects on the environment and human ***,the GW quality of this region is deteriorating progressively,and human health threatening by various life-threatening ***,the current study concentrated on the GW quality evaluation and prediction of possible health issues in the IBDR due to elevated contamination of As along with F-within GW aquifers by considering sixteen *** survey-based statistical methods such as entropy quality index(EWQI)combined with health risk index(HRI)was implemented for evaluating the As and F-sensitivity with the help of correlation testing and principal component *** study's outcome explains that a substantial portion of the IBDR has been vastly experiencing inferior GW quality,environmental issues,and health-related problems in dry and wet seasons,correspondingly for As and *** diagram verified the suitability of water that almost 55%of GW across the study area’s aquifers are unfit for drinking as well as cultivation of *** analysis and the Monte Carlo simulation method were also applied to assess the contaminant's concentration level and probable health risk *** present study concludes that the elevated exposure of As and F-pollution has to be monitored regularly and prevent unwanted GW contamination through implementing sustainable approaches and policies to fulfil the sustainable development goal 6(SDG-6)till 2030,ensuring the most basic human right of clean,safe,and hy

关键词： Indo-Bangladesh delta Entropy quality index Health risk index Monte Carlo simulation SDG-6

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磁极旋转式新型变磁通永磁同步电机弱磁性能分析

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电工技术学报 2020年第15期35卷 3182-3190页

作者：刘细平肖娟娟徐慧 tanmoy biswas 黄朝志江西理工大学电气工程与自动化学院赣州341000

针对永磁同步电机内部磁场难以调节的问题,提出一种磁极旋转式新型变磁通永磁同步电机。深入分析该新型变磁通电机的弱磁原理,通过虚拟样机技术对调磁装置进行动力学分析,获得弹簧形变长度和齿轮旋转角度随转速变化的规律;采用有限元分... 详细信息

针对永磁同步电机内部磁场难以调节的问题,提出一种磁极旋转式新型变磁通永磁同步电机。深入分析该新型变磁通电机的弱磁原理,通过虚拟样机技术对调磁装置进行动力学分析,获得弹簧形变长度和齿轮旋转角度随转速变化的规律;采用有限元分析技术对永磁体不同旋转角度的感应电动势、气隙磁通密度、绕组磁链和调磁特性等进行数值分析。仿真结果表明,通过设计合理的调磁装置,在离心力作用下,齿轮旋转角度范围为0~45°,电机具有良好的弱磁扩速性能。试制样机验证了理论分析的有效性。

关键词：机械调磁装置永磁同步电机旋转磁极电磁特性有限元分析

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Stand Alone Home Electricity Supply System Using Solar Energy

Stand Alone Home Electricity Supply System Using Solar Energ...

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作者： tanmoy biswas 江西理工大学

学位级别：硕士

Now a day's electricity is one of the basic necessities of *** the demand of electricity is thriving day by day,there is need to exploit renewable sources of *** the home appliances,my thesis "stand alone home electricity supply system using solar energy" will help to power extraction from solar panel the utilizing that power for the electricity requirement of *** is one of those regions where the electricity crisis in *** 20%of the total population have no access to electricity in Bangladesh and most of those people are in the rural and coastal *** electricity need is the biggest problems for their *** situation is very alarming in *** is one of the most basic rights and needs of human and *** government and NGOs recently have taken few projects to overcome these ***,the beneficiaries of those projects are mainly the urban community but not rural and coastal *** develop a nation,it is very essential to upgrade their urban and rural community *** solving the very basic light energy,especially in rural,isolated and the coastal community of Bangladesh,it was proposed to develop standalone solar *** renewable resources are the most effective for sustainable development of society and economically effective for small-scale power *** design,optimization and implementation of the proposed system,Chittagong coastal region,Bangladesh have chosen where renewable energy sources are mostly *** system is designed with reverse osmosis process using renewable energy(solar)for rural or coastal *** software used for power generation simulation and use proteus software for *** simulated results shown that(standalone solar system)renewable energy system are the most economical for rural area in ***,the proposed system mainly designs for rural,remote and coastal *** is really h

关键词： PV panels Solar cell Charge Controller Remote Area Connection Battery and Inverter

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Green Degumming of Silk by Enzyme Extracted from Natural Sources

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Journal of Materials Science and Chemical Engineering 2020年第8期8卷 30-40页

作者： Mahbubur Rahman Asim Bhowmik Sudipta Das Kartick Chowhan tanmoy biswas Department of Textile Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh

The main objective of this work is to degum the silk with natural enzyme in lieu of conventional degumming to make it sustainable. Fibroin and sericin are the main composition of silk. Sericin provides a harsh and stiff effect of silk and decreases the valuable property like luster and whiteness and also leads to uneven dyeing. It is necessary to remove this sericin for the better post processing of silk. The removal process of sericin from silk is called degumming. Usually degumming process is done by using chemicals like soda (Na2CO3), detergent and other chemical staffs. But these chemicals are lethal to the environment. So, if such component found that can be substitute the fatal components and give the same required result or very close then that would be considered as an asset. This work deals with the different enzymes extracted from natural sources such as papaya skin, pineapple skin and guava leaf with variation of enzyme concentrations such as 10 (%), 15 (%) & 20 (%) as well as 35°C 45°C & 55°C temperatures that influence the degumming efficiency. By analyzing the various samples on the basis of degumming efficiency and other tests such as tensile strength, water vapor permeability, pilling and abrasion, crease recovery, whiteness test and spot test are done by standard method, it is found that the enzyme extracted from papaya skin shows the best degumming efficiency 15.9 (%) and other tests also show the good result at 15 (%) concentration and 45°C temperature whereas degumming efficiency 16.6 (%) for conventional process. From this work, it can be concluded that enzyme extracted from papaya skin can be substituted of conventional degumming which is also ecofriendly.

关键词： Degumming Silk Enzyme Pineapple Skin Ecofriendly

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