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Fabrication and Characterization of Yarn-Based Temperature Sensor for Respiratory Monitoring 被引量:1
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作者 BAI Yunfeng XIE Erxiang +3 位作者 LI Qiao WANG Xi DING Hao ZHU Shigen 《Journal of Donghua University(English Edition)》 CAS 2022年第6期527-532,共6页
The development of wearable technologies promotes the research of flexible sensors.It is hoped that a flexible sensor can collect different physiological data,such as temperature and respiratory rate(RR).The temperatu... The development of wearable technologies promotes the research of flexible sensors.It is hoped that a flexible sensor can collect different physiological data,such as temperature and respiratory rate(RR).The temperature of the exhaled gas is generally higher than that in the air,and the periodic change of temperature is related to the respiratory rate.In this work,we use platinum fiber and spandex fiber to prepare yarn-based temperature sensor with high tensile performance through hollow spindle wrapping spinning technology.After the measurement,the sensitivity of the sensor can reach at least 3.18×10^(-3)℃^(-1).We use the sensor and ordinary fabric mask to prepare a sensor mask that can monitor human respiratory signals to explore the performance of the sensor in RR measurement.The experimental results show that when measuring human RR,the yarn-based temperature sensor can accurately distinguish different respiratory states such as normal breathing,deep breathing,and rapid breathing while speaking.It is suggested that yarn-based temperature sensors can be used in medical fields such as real-time respiratory detection and temperature measurement. 展开更多
关键词 flexible sensor yarn-based temperature sensor sensing mask respiratory measurement
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Research on Yarn Tension under Positive Guiding by Feed Rollers
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作者 丁彩红 唐军 《Journal of Donghua University(English Edition)》 EI CAS 2010年第1期41-45,共5页
In the carpet tufting machine,feed rollers are used to guide the yarns positively.After deducing the general Euler formula of yarn tension under positive guide of rollers,a conclusion is got that the tension of yarns ... In the carpet tufting machine,feed rollers are used to guide the yarns positively.After deducing the general Euler formula of yarn tension under positive guide of rollers,a conclusion is got that the tension of yarns at the output side of each roller tends to decrease one by one.Afterwards,a computing formula of wrap angle of yarn passing through the feed roller is deduced by application of triangle geometry method.By analyzing the effect of each parameter on the yarn tension,values of the space between rollers and the roller diameter are proposed for design reference,and relations between the yarn tension and the two key parameters,the friction coefficient of roller surface and the speed of rollers,are illustrated in detail.Consequently,a policy is drawn out to control the yarn tension.The results of this paper provide not only theory foundation for empirical settings of the operational parameters of tufting machine,but also theory support for further research on yarn tension-control methods. 展开更多
关键词 yarn tension Euler formula feed roller tufting machine
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The Mechanism of Eliminating Drafting Waves in Spinning
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作者 陈革 王幼江 李姝佳 《Journal of Donghua University(English Edition)》 EI CAS 2009年第2期154-158,共5页
The mechanism of the staple yarn's drafting waves during roller drafting is analyzed in this paper.It's concluded that the dynamic friction coefficient is greater than the static friction coefficient on the fr... The mechanism of the staple yarn's drafting waves during roller drafting is analyzed in this paper.It's concluded that the dynamic friction coefficient is greater than the static friction coefficient on the friction behavior of fibers,and the difference is largely responsible for the "stick-slip" motion of fibers which causes the drafting waves during drafting.In this paper,it's expected that when a high frequency undulating wave is imposed on the fiber strand in the drafting zone of roller system,the friction among fibers is dominated by the dynamic friction rather than the static friction,and thus the "stick-slip" motion will be eliminated.As a result,the fiber binding effect causing drafting waves can be significantly reduced.This hypothesis is verified by an experiment,and it can be applied in developing new spinning drafting device. 展开更多
关键词 SPINNING DRAFTING drafting waves floating fibers
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A Novel Design of Shedding Wheels for 3D Circular Loom
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作者 孙志宏 周申华 +2 位作者 毛立民 刘晟 袁建润 《Journal of Donghua University(English Edition)》 EI CAS 2011年第5期481-484,共4页
Three-dimensional(3D) circular loom is a textile machine to produce 3D tubular fiber composites reinforcement.The shedding wheels system is an important part of 3D circular loom to schedule the shedding order which ha... Three-dimensional(3D) circular loom is a textile machine to produce 3D tubular fiber composites reinforcement.The shedding wheels system is an important part of 3D circular loom to schedule the shedding order which has several types.A computer aided design system is proposed,which is implemented in SolidWorks,and provides a tool for practicing designers to design the sheddling wheel system more efficiently. 展开更多
关键词 shedding wheel Solid Works design table
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Correlation between the Surface Quality and the Lapping Parameters in Loose Abrasive Lapping
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作者 原一高 骆祎岚 朱世根 《Journal of Donghua University(English Edition)》 EI CAS 2011年第1期71-74,共4页
As one of the basic finishing operations,loose abrasive lapping is widely used in the surface finishing on metallic parts,non-metallic components,and engineering ceramics.During lapping,lapping parameters have a great... As one of the basic finishing operations,loose abrasive lapping is widely used in the surface finishing on metallic parts,non-metallic components,and engineering ceramics.During lapping,lapping parameters have a great influence on surface quality of machined workpiece.In order to provide an experimental basis for the selection of lapping parameters,effects of some important variables such as abrasive size,lapping load,and lapping speed,on surface roughness and residual surface stress of high speed steel workpiece via loose abrasive lapping were discussed in this paper.The results show that the work surface roughness increases with the increasing of abrasives size or decreasing lapping load,and does not change obviously with the lapping speed.Lapping can cause residual compressive stress in the surface layer of lapped workpiece,and the magnitude of residual surface stress becomes larger with increasing abrasive size,lapping load,and lapping speed. 展开更多
关键词 loose abrasive lapping surface roughness residual stress high speed steel
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Nanofriction characteristics of h-BN with electric field induced electrostatic interaction 被引量:1
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作者 Kemeng YU Kun ZOU +1 位作者 Haojie LANG Yitian PENG 《Friction》 SCIE EI CAS CSCD 2021年第6期1492-1503,共12页
The nanofriction properties of hexagonal boron nitride(h-BN)are vital for its application as a substrate for graphene devices and solid lubricants in micro-and nano-electromechanical devices.In this work,the nanofrict... The nanofriction properties of hexagonal boron nitride(h-BN)are vital for its application as a substrate for graphene devices and solid lubricants in micro-and nano-electromechanical devices.In this work,the nanofriction characteristics of h-BN on Si/SiO_(2) substrates with a bias voltage are explored using a conductive atomic force microscopy(AFM)tip sliding on the h-BN surface under different substrate bias voltages.The results show that the nanofriction on h-BN increases with an increase in the applied bias difference(V_(t–s))between the conductive tip and the substrate.The nanofriction under negative V_(t–s) is larger than that under positive V_(t–s).The variation in nanofriction is relevant to the electrostatic interaction caused by the charging effect.The electrostatic force between opposite charges localized on the conductive tip and at the SiO2/Si interface increases with an increase in V_(t–s).Owing to the characteristics of p-type silicon,a positive V_(t–s) will first cause depletion of majority carriers,which results in a difference of nanofriction under positive and negative V_(t–s).Our findings provide an approach for manipulating the nanofriction of 2D insulating material surfaces through an applied electric field,and are helpful for designing a substrate for graphene devices. 展开更多
关键词 nanofriction electrostatic interaction bias voltage H-BN atomic force microscopy
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