scholarly journals Effective Reusable Cleanroom Garments and Evaluation of Garment Life

2021 ◽  
Author(s):  
Tim Eaton ◽  
William Whyte
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Test Methods ◽  
Performance Parameters ◽  
Visual Examination ◽  
Contamination Control ◽  
Fold Reduction ◽  
Physical Tests ◽  
Low Dispersion ◽  
Scanning Electron

Cleanroom garments are used to control the airborne dispersion of contamination from people into the cleanroom. The effectiveness of the garment in controlling the dispersion of contamination is a function of the fabric and design of garments, and test methods used to ascertain the effectiveness of garments are discussed in this article. These test methods can be used when choosing garments for use in a cleanroom but were used in this article to determine the deterioration of garments through use. Cleanroom garments were subjected to increasing numbers of decontamination cycles, which included sterilisation by gamma radiation, up to a maximum of 70. At defined number of decontamination cycles, the garment’s fabric was compared to a new fabric by visual examination, by a scanning electron microscope, and by physical tests of key performance parameters. It was concluded that the performance of the fabric remained acceptable up to 50 decontamination cycles. This conclusion was supported by the low dispersion rate of particles and microbe-carrying particles in a dispersal chamber from personnel wearing the garments. After 50 decontamination cycles, a low dispersion rate of 0.2/s of microbe-carrying particles from personnel wearing the garments was obtained and a 194-fold reduction in the microbial dispersion rate compared to cleanroom undergarments. Key words: cleanroom garments, garment life, contamination control

scholarly journals Effect of Particle Size on the Wear Property of Magnetorheological Fluid

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Qiuxiang Zhang ◽  
Xinhua Liu ◽  
Yankun Ren ◽  
Lifeng Wang ◽  
Yuan Hu
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Magnetorheological Fluid ◽  
Test Methods ◽  
Wear Property ◽  
Preparation Process ◽  
Before And After ◽  
Effect Of Particle Size ◽  
Scanning Electron

Aiming to study the effect of particle size on the wear property of magnetorheological fluid (MRF), experiment materials, preparation process, and test methods are elaborated, and three different MRF samples consisting of particles of different size are prepared. Test experiments are carried out and the effect of particle size on the wear property of MRF is discussed. Moreover, the microstructures of particles extracted from MRF obtained before and after the wear experiments are observed by scanning electron microscope (SEM). Experimental results show that the particle size has a significant effect on wear property of MRF. Furthermore, the MRF with particles of 1.5–2.8 μm diameter on average is good for the requirement of engineering applications.

Study and Improvement of Oilfield Sewage Corrosion Test Methods

2013 ◽  
Vol 838-841 ◽  
pp. 2488-2493
Author(s):  
Kun Jiao ◽  
Cheng Tun Qu ◽  
Bo Yang ◽  
Xie Qian
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Corrosion Test ◽  
Water Injection ◽  
Test Methods ◽  
Water Tank ◽  
Test Device ◽  
Corrosion Rates ◽  
Scanning Electron ◽  
Static Corrosion

The corrosion status and results in a certain water injection station in Shanbei oilfield were monitored and evaluated by flow corrosion test (FCT) (with homemade corrosion test device), static corrosion test (SCT), and water tank corrosion test (WTCT). The coupons after corrosion tests were observed by Scanning Electron Microscope (SEM). It was found that: the corrosion rates of SCT, FCT and WTCT were 0.0469~0.0552 mm/a, 0.5126~0.5299 mm/a, and 0.3250~0.3414 mm/a respectively; the corrosion rates SCT were much smaller than actual. The severity of pitting corrosion, pointed corrosion and other forms of local corrosion cannot be reflected by SCT. The corrosion rates and behaviors tested by homemade corrosion test device are more close and similar to the real.

Analysis of the Mechanism of Fracture of Silicone Metacarpophalangeal Prostheses

2008 ◽  
Vol 34 (1) ◽  
pp. 18-24 ◽  
Author(s):  
T. J. JOYCE
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Crack Propagation ◽  
Visual Examination ◽  
Fatigue Process ◽  
Dorsal Aspect ◽  
Distal Stem ◽  
Scanning Electron

Eleven fractured Sutter metacarpophalangeal prostheses were obtained from the hands of three patients. All of the implants had fractured at the junction of the distal stem and the hinge. After visual examination, the fracture faces were prepared and viewed using a scanning electron microscope. These images indicated that fracture was initiated by abrasion on the dorsal aspect of the distal stem of the prostheses, close to the hinge. Crack propagation was shown to be due to a fatigue process. Once a crack started, its direction of travel could be followed, using topographical features common to engineering fracture analyses. Propagation was from radial to ulnar and from dorsal to palmar.

Aging Evaluation and Online Monitoring of Composite Insulators

2014 ◽  
Vol 521 ◽  
pp. 309-312
Author(s):  
Jun Wu ◽  
Zheng Zheng ◽  
Hong Bo Chen ◽  
Huan Bai ◽  
Dao Chun Huang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Thermal Imaging ◽  
Online Monitoring ◽  
Visual Examination ◽  
Monitoring Method ◽  
Infrared Thermal Imaging ◽  
On Line ◽  
Sem Test ◽  
Scanning Electron

To evaluate the aging characteristics and study online monitoring method of composite insulators, four 220kV composite insulators of the same type were tested by visual examination, hydrophobicity tests, infrared thermal imaging tests and scanning electron microscope (SEM) tests. The results show that the infrared thermal imaging tests can effectively detect the broken insulators on-line and the SEM test is feasible to evaluate the aging degree of composite insulators.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

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