The influence of high temperature on microstructural damage and residual properties of nano-silica-modified (NS-modified) self-consolidating engineering cementitious composites (SC-ECC) using response surface methodology (RSM)

2018 ◽  
Vol 192 ◽  
pp. 450-466 ◽  
Author(s):  
Bashar S. Mohammed ◽  
Bitrus Emmanuel Achara ◽  
Mohd Shahir Liew
Keyword(s):  
Response Surface Methodology ◽  
High Temperature ◽  
Response Surface ◽  
Cementitious Composites ◽  
Nano Silica ◽  
Microstructural Damage ◽  
Residual Properties

scholarly journals OPTIMIZATION OF TRIBOLOGICAL PROPERTIES OF AN EPOXY HYBRID POLYMER COMPOSITE REINFORCED WITH ZrB2 AND PTFE PARTICLES USING RESPONSE SURFACE METHODOLOGY FOR HIGH-TEMPERATURE TRIBOLOGICAL APPLICATIONS

2021 ◽  
Vol 55 (6) ◽  
Author(s):  
Aswathi A. Narayanan ◽  
R. S. Sudheesh
Keyword(s):  
Response Surface Methodology ◽  
High Temperature ◽  
Wear Rate ◽  
Response Surface ◽  
Tribological Properties ◽  
Epoxy Composites ◽  
Liner Material ◽  
Spherical Bearing ◽  
Pin On Disc ◽  
Hybrid Polymer Composite

Hybrid PTFE/epoxy composites are widely used as materials for self-lubricating spherical bearing which are used in a high-temperature environment. In the present work, zirconium diboride (ZrB2) particles are incorporated to enhance high-temperature tribological properties of PTFE/epoxy composites. Pin on disc experiment is conducted with the aid of design of experiments (DOE) using central composite-response surface methodology (RSM). Under a load of 40 N and 1.25 m/s sliding speed, the optimum content 5.95 vol% of PTFE and 5.05 vol% of ZrB2, yields an ultralow coefficient of friction (COF) in conjunction with a low wear rate of the composite. The addition of ultra-high-temperature ceramic ZrB2 particles and solid lubricant PTFE is found to enhance the thermal conductivity and improve the heat transfer thereby reducing contact temperature. The use of optimum composition of the composite is capable of reducing the wear rate and high local temperature due to friction, implying its potential use as a self-lubricating spherical bearing liner material.

Optimisation of high temperature puffing of potato cubes using response surface methodology

2004 ◽  
Vol 61 (2) ◽  
pp. 153-163 ◽  
Author(s):  
A.I Varnalis ◽  
J.G Brennan ◽  
D.B MacDougall ◽  
S.G Gilmour
Keyword(s):  
Response Surface Methodology ◽  
High Temperature ◽  
Response Surface

scholarly journals Hot, humid air decontamination of aircraft confirmed that high temperature and high humidity are critical for inactivation of infectious, enveloped ribonucleic acid (RNA) virus

2020 ◽  
Author(s):  
Tony L. Buhr ◽  
Alice A. Young ◽  
Erica Borgers-Klonkowski ◽  
Neil L. Kennihan ◽  
Harold K. Barnette ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
High Temperature ◽  
Relative Humidity ◽  
Response Surface ◽  
Ribonucleic Acid ◽  
Rna Virus ◽  
High Humidity ◽  
Humid Air ◽  
Enveloped Virus ◽  
Aircraft Performance

ABSTRACTAimsTo develop infectious (live/dead) enveloped virus test indicators and Response Surface Methodology (RSM) models that evaluate survival of an enveloped ribonucleic acid (RNA) virus on contaminated aircraft materials after exposure to hot, humid air (HHA).Methods and ResultsEnveloped RNA bacteriophage Phi6 (Φ6) was dried on wiring insulation, aircraft performance coating (APC), polypropylene, and nylon at ≥ 8 log10 plaque-forming units (PFU) test coupon-1. Only 2.4 log10 inactivation was measured on APC at 70°Celsius (°C), 5% relative humidity (RH) after 24 h. In contrast, HHA RSM models showed a 90% probability of a 7-log10 inactivation at ≥63°C, 90% RH after 1 h, and decontamination kinetics were similar across different materials. HHA decontamination of C-130 and C-17 aircraft showed >7 log10 and ≥5.9 log10 inactivation of enveloped virus on 100 and 110 test indicators, respectively, with a 1-h treatment, excluding ramp-up and ramp-down times.ConclusionsEnveloped RNA virus test indicators were successfully developed, lab tested for HHA decontamination, analyzed for RSM, and field-tested in aircraft demonstrations.Significance and Impact of the StudyThe utility of HHA decontamination was demonstrated after inactivating enveloped RNA virus on aircraft with a 1-h HHA treatment within aircraft temperature and RH limits.

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