scholarly journals Effects of Water Absorption on Fatigue Properties of SMC Material and Its Degradation Mechanism.

1993 ◽  
Vol 42 (475) ◽  
pp. 398-404 ◽  
Author(s):  
Hiroshi HASHIMOTO ◽  
Yuji KIMURA ◽  
Takayoshi YAGASAKI
Keyword(s):  
Water Absorption ◽  
Degradation Mechanism ◽  
Fatigue Properties

Coating Adhesion Effects on Fiber Strength and Fatigue Properties

1986 ◽  
Vol 88 ◽  
Author(s):  
Bolesh J. Skutnik ◽  
Barbara D. Munsey ◽  
Carol T. Brucker
Keyword(s):  
Water Absorption ◽  
Protective Coatings ◽  
Fiber Strength ◽  
Polymeric Materials ◽  
Fused Silica ◽  
Fatigue Properties ◽  
Static Fatigue ◽  
Strong Positive Correlation ◽  
Water Permeation ◽  
Lap Shear

ABSTRACTOrganic/polymeric materials remain the most prevalent protective coatings for optical fibers. Many studies have chronicled significant differences inn the levels of protection against moisture and other adverse environments by such coatings. Recently an attempt was made to identify those coating properties which correlate with these protective characteristics. Water absorption and adhesion between the coating and fused silica were proposed to correlate the best.In this study a series of coatings have been prepared with varying levels of adhesion to fused silica substrates, without significant differences in water absorption or in water permeation properties. The tensile strength, static fatigue and dynamic fatigue properties of the coated fibers were measured and correlated with the lap shear strengths of correspondingly coated slides. As the adhesion of the coating/silica glass interface increases, the corresponding fiber's strength and fatigue properties improve also.The strong positive correlation between the coating's adhesion and the fiber's strength/fatigue properties will be reported for a number of coating/fiber combinations. Effects on lifetime predictability will also be addressed.

Structures of c-di-GMP/cGAMP degrading phosphodiesterase VcEAL: identification of a novel conformational switch and its implication

2019 ◽  
Vol 476 (21) ◽  
pp. 3333-3353 ◽  
Author(s):  
Malti Yadav ◽  
Kamalendu Pal ◽  
Udayaditya Sen
Keyword(s):  
Active Site ◽  
Metal Binding ◽  
Metal Ion ◽  
Triosephosphate Isomerase ◽  
Catalytic Mechanism ◽  
Degradation Mechanism ◽  
Structural Basis ◽  
Conserved Residues ◽  
Phosphodiester Bond ◽  
Cyclic Dinucleotides

Cyclic dinucleotides (CDNs) have emerged as the central molecules that aid bacteria to adapt and thrive in changing environmental conditions. Therefore, tight regulation of intracellular CDN concentration by counteracting the action of dinucleotide cyclases and phosphodiesterases (PDEs) is critical. Here, we demonstrate that a putative stand-alone EAL domain PDE from Vibrio cholerae (VcEAL) is capable to degrade both the second messenger c-di-GMP and hybrid 3′3′-cyclic GMP–AMP (cGAMP). To unveil their degradation mechanism, we have determined high-resolution crystal structures of VcEAL with Ca2+, c-di-GMP-Ca2+, 5′-pGpG-Ca2+ and cGAMP-Ca2+, the latter provides the first structural basis of cGAMP hydrolysis. Structural studies reveal a typical triosephosphate isomerase barrel-fold with substrate c-di-GMP/cGAMP bound in an extended conformation. Highly conserved residues specifically bind the guanine base of c-di-GMP/cGAMP in the G2 site while the semi-conserved nature of residues at the G1 site could act as a specificity determinant. Two metal ions, co-ordinated with six stubbornly conserved residues and two non-bridging scissile phosphate oxygens of c-di-GMP/cGAMP, activate a water molecule for an in-line attack on the phosphodiester bond, supporting two-metal ion-based catalytic mechanism. PDE activity and biofilm assays of several prudently designed mutants collectively demonstrate that VcEAL active site is charge and size optimized. Intriguingly, in VcEAL-5′-pGpG-Ca2+ structure, β5–α5 loop adopts a novel conformation that along with conserved E131 creates a new metal-binding site. This novel conformation along with several subtle changes in the active site designate VcEAL-5′-pGpG-Ca2+ structure quite different from other 5′-pGpG bound structures reported earlier.

Effect of ink and paperboard characteristics on flexographic print quality based on print density

TAPPI Journal ◽  
2011 ◽  
Vol 10 (9) ◽  
pp. 7-13
Author(s):  
KHODADAD MALMIRCHEGINI ◽  
FARSHAD SARKHOSH RAHMANI
Keyword(s):  
Water Absorption ◽  
Significant Influence ◽  
Particle Diameter ◽  
Print Quality ◽  
Printing Technology ◽  
Plastic Films ◽  
Printing Inks ◽  
Packaging Industry ◽  
Solids Content ◽  
Density Results

Flexography is an evolving printing technology that is suitable for printing on coated and uncoated paperboard and board, nonporous substrates including metalized and paperboard foils, and plastic films used especially in the packaging industry. This study evaluated the effect of paperboard and ink characteristics on flexographic print density in paperboard. Three commercial paperboards from different companies were prepared: brown kraft from Thailand, white kraft from Spain, and test liner from Iran. Four samples of process print inks from Iran were used in this investigation. Paperboard properties, such as roughness and water absorption, and ink characteristics, including solids content, PH and particle diameter, were measured. The inks were printed on paperboards using a roll no.15 applicator with a blade metering device, and the print densities were measured. Results showed that solids content, pH, and particle diameter of printing inks influenced print density, while the roughness and water absorption of the three types of paperboard had no significant influence on print density. Results also illustrated that two levels of ink viscosity (25–30 and 50–55 mPa·s) were insignificant to print density.

Effect of Texture and {10-12} Twin on the Low Cycle Fatigue Properties of Rolled AZ31 Mg Alloy

2013 ◽  
Vol 51 (5) ◽  
pp. 325-332 ◽  
Author(s):  
Sung Hyuk Park ◽  
Seong-Gu Hong ◽  
Chong Soo Lee ◽  
Ha Sik Kim
Keyword(s):  
Low Cycle Fatigue ◽  
Mg Alloy ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Az31 Mg Alloy

Effects of Natural Fiber Reinforcement on Water Absorption of Compressed Stabilized Earth Blocks

2012 ◽  
Vol 2 (11) ◽  
pp. 165-167
Author(s):  
B.O .Ugwuishiwu B.O .Ugwuishiwu ◽  
◽  
B.O. Mama B.O. Mama ◽  
N. M Okoye N. M Okoye
Keyword(s):  
Water Absorption ◽  
Natural Fiber ◽  
Fiber Reinforcement ◽  
Earth Blocks

Influence of Water Absorption on The Selected Properties of Hemp Hurds Composites

2015 ◽  
Vol 10 (1) ◽  
pp. 123-132
Author(s):  
Lucia Kidalova ◽  
Nadezda Stevulova ◽  
Eva Terpakova
Keyword(s):  
Water Absorption ◽  
Influence Of Water
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