Pub Date : 2020-10-01DOI: 10.21608/jest.2020.116592
{"title":"ENHANCING THE FRICTIONAL PERFORMANCE OF SPORT GLOVES","authors":"","doi":"10.21608/jest.2020.116592","DOIUrl":"https://doi.org/10.21608/jest.2020.116592","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"259 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123092224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.21608/jest.2020.110830
{"title":"PROPER MATERIAL SELECTION OF MEDICAL GLOVES","authors":"","doi":"10.21608/jest.2020.110830","DOIUrl":"https://doi.org/10.21608/jest.2020.110830","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121318149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.21608/jest.2020.118065
{"title":"FRICTION AND WEAR OF POLYMERIC COMPOSITES FILLED BY OILS","authors":"","doi":"10.21608/jest.2020.118065","DOIUrl":"https://doi.org/10.21608/jest.2020.118065","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123848474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.21608/jest.2020.118063
{"title":"EFFECT OF DISPERSING LITHIUM GREASE BY ALUMINUM OXIDE NANOPARTICLES AND CARBON NANOTUBES","authors":"","doi":"10.21608/jest.2020.118063","DOIUrl":"https://doi.org/10.21608/jest.2020.118063","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134430142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.21608/jest.2020.78801
{"title":"ELECTROSTATIC CHARGE GENERATED FROM SLIDING ON POLYETHYLENE TURF","authors":"","doi":"10.21608/jest.2020.78801","DOIUrl":"https://doi.org/10.21608/jest.2020.78801","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133147370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.21608/jest.2021.189027
The present study deals to evaluate the effect of mixing lithium grease by paraffin oil that dispersed with silicon dioxide (SiO2) nanoparticles and carbon nanotubes (CNT) on the lubricating properties of deep drawing process. Friction and wear tests were conducted by the reciprocating sliding of bearing steel ball on aluminum (Al) sheet lubricated by the mixture. It was found that friction coefficient displayed by the grease dispersed by CNT/ SiO2 displayed the highest values followed by SiO2. Minimum values were observed when carbon nanotubes were added at 0.4 and 0.6 wt. %. The morphology of worn surface is analyzed by optical microscopy for measuring the wear scare width as an indication for the wear rate. Minimum wear values were displayed by grease mixed by 50 % wight content of paraffin oil. Further increase in SiO2 content significantly increased wear due to their abrasive action. It was observed that combination of CNT/ SiO2 significantly increases of friction and wear. That can be explained on the bases that agglomeration of CNT increased their layers and shear stress. SiO2 showed relatively lower increase in friction due to the ball bearing effect of the nanoparticles.
{"title":"TRIBOLOGICAL PERFORMANCE OF LITHIUM GREASE DISPERSED BY SILCA NANO PARTICLES AND CARBON NANOTUBES","authors":"","doi":"10.21608/jest.2021.189027","DOIUrl":"https://doi.org/10.21608/jest.2021.189027","url":null,"abstract":"The present study deals to evaluate the effect of mixing lithium grease by paraffin oil that dispersed with silicon dioxide (SiO2) nanoparticles and carbon nanotubes (CNT) on the lubricating properties of deep drawing process. Friction and wear tests were conducted by the reciprocating sliding of bearing steel ball on aluminum (Al) sheet lubricated by the mixture. It was found that friction coefficient displayed by the grease dispersed by CNT/ SiO2 displayed the highest values followed by SiO2. Minimum values were observed when carbon nanotubes were added at 0.4 and 0.6 wt. %. The morphology of worn surface is analyzed by optical microscopy for measuring the wear scare width as an indication for the wear rate. Minimum wear values were displayed by grease mixed by 50 % wight content of paraffin oil. Further increase in SiO2 content significantly increased wear due to their abrasive action. It was observed that combination of CNT/ SiO2 significantly increases of friction and wear. That can be explained on the bases that agglomeration of CNT increased their layers and shear stress. SiO2 showed relatively lower increase in friction due to the ball bearing effect of the nanoparticles.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129685069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.21608/jest.2021.169065
{"title":"TRIBOLOGICAL BEHAVIOR OF ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE NANOCOMPOSITES","authors":"","doi":"10.21608/jest.2021.169065","DOIUrl":"https://doi.org/10.21608/jest.2021.169065","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131766920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.21608/jest.2021.169062
Badran
The present work discusses the electrostatic charges (ESC) generated on the surface of the protective equipment of people working in the medical care such as uniform, gloves, disposable gowns and eye drape to control their effectiveness to protect the wearer from viruses such as Covid-19. The experimental observations showed that ESC generated from contact and separation of the doctor uniform and doctor gown slightly increased with increasing the applied load. Sliding generated relatively higher ESC than that observed in contact and separation. It is known that negative ESC generated on the gown is preferable to repel the viruses of negative charge such as Covid-19. The relatively high negative ESC gained by the gown can protect the doctor from infection. After contact and separation of latex gloves and gown, latex gloves gained relatively higher positive ESC that represents higher risk of attracting the negative charged viruses into the gloves and increases the possibility to infect other persons. Based on that, latex gloves should be replaced by PE (polyethylene) gloves to gain relatively lower values of ESC. It is known the gowns gained negative ESC are able to provide protection for the wearer against infection. In addition to that, contact and separation as well as sliding of doctor gown and patient gown generated negative ESC on the doctor gown. Polypropylene (PP) gown ensures the repulsion of the negative charged viruses including Covid-19 away. Finally, ESC generated on the medical cloth surfaces generate electric field that could ionize the air around the charged surfaces. Surfaces of negative ESC generate electric field that can ionize the air by negative ESC able to repel the viruses away of the surface.
{"title":"ELECTROSTATIC CHARGES GENERATED ON THE MEDICAL CLOTHES","authors":"Badran","doi":"10.21608/jest.2021.169062","DOIUrl":"https://doi.org/10.21608/jest.2021.169062","url":null,"abstract":"The present work discusses the electrostatic charges (ESC) generated on the surface of the protective equipment of people working in the medical care such as uniform, gloves, disposable gowns and eye drape to control their effectiveness to protect the wearer from viruses such as Covid-19. The experimental observations showed that ESC generated from contact and separation of the doctor uniform and doctor gown slightly increased with increasing the applied load. Sliding generated relatively higher ESC than that observed in contact and separation. It is known that negative ESC generated on the gown is preferable to repel the viruses of negative charge such as Covid-19. The relatively high negative ESC gained by the gown can protect the doctor from infection. After contact and separation of latex gloves and gown, latex gloves gained relatively higher positive ESC that represents higher risk of attracting the negative charged viruses into the gloves and increases the possibility to infect other persons. Based on that, latex gloves should be replaced by PE (polyethylene) gloves to gain relatively lower values of ESC. It is known the gowns gained negative ESC are able to provide protection for the wearer against infection. In addition to that, contact and separation as well as sliding of doctor gown and patient gown generated negative ESC on the doctor gown. Polypropylene (PP) gown ensures the repulsion of the negative charged viruses including Covid-19 away. Finally, ESC generated on the medical cloth surfaces generate electric field that could ionize the air around the charged surfaces. Surfaces of negative ESC generate electric field that can ionize the air by negative ESC able to repel the viruses away of the surface.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117127790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.21608/jest.2021.169557
{"title":"INFLUENCE OF ELECTROSTATIC CHARGE ON FRICTION OF GRIPPER IN HANDLING MATERIAL","authors":"","doi":"10.21608/jest.2021.169557","DOIUrl":"https://doi.org/10.21608/jest.2021.169557","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114216268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.21608/jest.2021.169060
{"title":"PROPER MATERIAL SELECTION OF MEDICAL SAFETY GOGGLES","authors":"","doi":"10.21608/jest.2021.169060","DOIUrl":"https://doi.org/10.21608/jest.2021.169060","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132557262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：