Application of newly developed fibre orientation measurement techniques for needle-punched nonwoven

New structural characteristics based on tracer fibre and Lindsley’s techniques to measure the fibre orientation in X, Yand Z directions of needle-punched nonwoven have been investigated. The results are verified with variable cylinder speed,punch density and needle depth penetration. It is evident that measured structural characteristics and fabric tensile strengthshow very good correlation in machine direction but poor correlation in cross-direction

Effect of fibre orientation on mechanical and functional properties of needle-punched nonwoven

An attempt has been made to study the effect of fibre orientation, measured by the structural characteristics, onmechanical and functional properties of needle-punched nonwoven by varying the carding machine and punchingparameters. It is observed that all measured physical, mechanical and functional properties of nonwovens have strongcorrelation with the proposed structural characteristics. Cylinder speed, punch density and needle depth penetration havesignificant effect on fabric thickness, air permeability, pore diameter, filtration efficiency and pressure drop

Filtration performance of needle-punched nonwoven air filter media through dyeing process

Viscose fibre has been dyed with various dye concentrations and the needle-punched nonwoven fabrics are prepared using the dyed fibre, keeping machine parameters the same. The physical properties, such as tenacity & bursting strength, and functional performance properties, such as mean flow pore size, filtration efficiency & pressure drop, are measured. It is found that the dyeing plays a big role in altering the overall performance of the needle-punched nonwoven. The tenacity of the needle-punched nonwoven fabric is reduced as dye concentration is increased. Filtration efficiency is measured for three different sizes of particles, namely 3µm, 5µm, and 10µm. For all three cases, the filtration efficiency is increased initially till 3% dye concentration and beyond that it is reduced.

Quantification of binder fibres in needle-punched nonwoven and its influence on physical-mechanical-functional properties of an air filter media

A nonwoven filter (viscose fibres) with an optimal design has been developed by controlling the binder fibres (fibres in the vertical direction) in the needle-punched nonwoven. Box and Behnken design in conjunction with 3D surface analysis has been used to study the effect of punch density, needle penetration depth and stroke frequency, considering the percentage of binder fibres in the overall structure on thickness, tenacity, air permeability and filtration efficiency of the filter. In this work, all the above properties are explained in the light of the considered structural index ‘percentage of binder fibres’. It is observed that the percentage of binder fibres increases with the increase of all three considered punching parameters. The thickness and tenacity are found to be decreased and increased respectively, with the increase of binder fibre percentage. The air permeability initially decreases and then increases with the increase in the percentage of binder fibres, whereas the filtration efficiency shows the opposite trend

She: A History of Adventure and its Misogynist Attack on Early Feminism

This essay analyzes the gender-based socio-political implications of H. Rider Haggard’s She: A History of Adventure, which engages with the historical context of Victorian Britain. This essay argues that the novel, which functions as a misogynist political tool, implicitly strives to assault the progressive emergence of early first-wave feminism in Victorian Britain. In doing so, Haggard’s novel attacks the values of two particular activists, as well as the following specific aspects of nineteenth-century feminism: a belief in the equal worth of women and men; opposition to social constructions of femininity that portray certain women as immoral or promiscuous; and opposition to a political structure that discriminates against women and renders them subservient to patriarchal interests. Near the end of the essay, a gender-based theme identified by Sandra Gilbert and Susan Guhar is explored in relation to Haggard’s novel. In the process of analyzing the novel and its relationship with systemic gender-based oppression, this essay addresses the broad issue of the extent to which literature reflects human culture

Effect of fibre orientation on mechanical and functional properties of needle-punched nonwoven

321-328An attempt has been made to study the effect of fibre orientation, measured by the structural characteristics, on mechanical and functional properties of needle-punched nonwoven by varying the carding machine and punching parameters. It is observed that all measured physical, mechanical and functional properties of nonwovens have strong correlation with the proposed structural characteristics. Cylinder speed, punch density and needle depth penetration have significant effect on fabric thickness, air permeability, pore diameter, filtration efficiency and pressure drop

Application of newly developed fibre orientation measurement techniques for needle-punched nonwoven

131-140New structural characteristics based on tracer fibre and Lindsley’s techniques to measure the fibre orientation in X, Y and Z directions of needle-punched nonwoven have been investigated. The results are verified with variable cylinder speed, punch density and needle depth penetration. It is evident that measured structural characteristics and fabric tensile strength show very good correlation in machine direction but poor correlation in cross-direction

Filtration performance of needle-punched nonwoven air filter media through dyeing process

417-423Viscose fibre has been dyed with various dye concentrations and the needle-punched nonwoven fabrics are prepared using the dyed fibre, keeping machine parameters the same. The physical properties, such as tenacity & bursting strength, and functional performance properties, such as mean flow pore size, filtration efficiency & pressure drop, are measured. It is found that the dyeing plays a big role in altering the overall performance of the needle-punched nonwoven. The tenacity of the needle-punched nonwoven fabric is reduced as dye concentration is increased. Filtration efficiency is measured for three different sizes of particles, namely 3μm, 5μm, and 10μm. For all three cases, the filtration efficiency is increased initially till 3% dye concentration and beyond that it is reduced

Quantification of binder fibres in needle-punched nonwoven and its influence on physical-mechanical-functional properties of an air filter media

204-217A nonwoven filter (viscose fibres) with an optimal design has been developed by controlling the binder fibres (fibres in the vertical direction) in the needle-punched nonwoven. Box and Behnken design in conjunction with 3D surface analysis hasbeen used to study the effect of punch density, needle penetration depth and stroke frequency, considering the percentage of binder fibres in the overall structure on thickness, tenacity, air permeability and filtration efficiency of the filter. In this work, all the above properties are explained in the light of the considered structural index ‘percentage of binder fibres’. It is observed that the percentage of binder fibres increases with the increase of all three considered punching parameters. The thickness and tenacity are found to be decreased and increased respectively, with the increase of binder fibre percentage. The air permeability initially decreases and then increases with the increase in the percentage of binder fibres, whereas the filtration efficiency showsthe opposite trend

The Promise of Teleconsultation in the Era of Pandemic: A Case from Bangladesh

Item not available in this repository.Background:In 2016, the Government of Bangladesh (GoB) established a teleconsultation service called Shastho Batayon to increase access to physicians. During COVID-19 pandemic, health care access became limited due to movement restrictions. In response, GoB made Shastho Batayon toll free, publicized the number through media, increased the number of call center doctors, introduced automated messages on COVID-19 preventive measures, and developed a scoring system to classify risk groups for COVID-19. Objectives and Methods:In this case report, we describe how an existing national teleconsultation service can be utilized in a low- and middle-income country to address primary health care needs during a public health emergency. We conducted secondary analysis of Shastho Batayon service data from January to April 2020. Results:The total calls for doctor's consultation increased during the pandemic. Prepandemic, Shastho Batayon received less than 20,000 calls per month. In March 2020, when the first cases of COVID-19 were confirmed, Shastho Batayon services received 60,811 calls for doctor's consultation, which increased to 125,660 calls in April, 2020. The doctor's consultation for primary care has increased for all conditions. Shastho Batayon services screened 28,944 patients with the influenza-like illness or COVID-19-like symptoms in March and April, 2020, provided preventive measures, advice, and referral to designated hospitals based on a national guideline. Conclusions:In public health emergencies such as COVID-19 pandemic, teleconsultation services can help provide prevention guidelines, debunk misinformation, identify risk categories, and refer people to appropriate service and facilities in a timely manner. , , andhttps://doi.org/10.1089/tmj.2021.052