ACCELERATED AGING AND CHARACTERIZATION OF A PLASTICIZED POLY(ESTER URETHANE) BINDER

2007 ◽  
Author(s):  
DEBRA A. WROBLESKI ◽  
DAVID A. LANGLOIS ◽  
E. BRUCE ORLER ◽  
ANDREA LABOURIAU ◽  
MARIANA M. URIBE ◽  
...  
Keyword(s):  
Accelerated Aging

The Accelerated Aging Characterization of High Power LED

2012 ◽  
Vol 33 (11) ◽  
pp. 1236-1240 ◽  
Author(s):  
李艳菲 LI Yan-fei ◽  
张方辉 ZHANG Fang-hui ◽  
张静 ZHANG Jing
Keyword(s):  
High Power ◽  
Accelerated Aging ◽  
High Power Led

scholarly journals Preparation and Characterization of Composites Materials with Rubber Matrix and with Polyvinyl Chloride Addition (PVC)

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1978
Author(s):  
Dan Dobrotă ◽  
Valentin Petrescu ◽  
Cristinel Sabin Dimulescu ◽  
Mihaela Oleksik
Keyword(s):  
Substantial Reduction ◽  
Accelerated Aging ◽  
Mechanical Tests ◽  
Point Of View ◽  
Rubber Matrix ◽  
The Finite Element Method ◽  
Composites Materials ◽  
Before And After ◽  
Conveyor Belts

An important problem that arises at present refers to the increase in performances in the exploitation of the conveyor belts. Additionally, it is pursued to use some materials, which can be obtained by recycling rubber and PVC waste, in their structure. Thus, the research aimed at creating conveyor belts using materials obtained from the recycling of rubber and PVC waste. Under these conditions, conveyor belts were made that had in their structure two types of rubber and PVC, which was obtained by adding in certain proportions of reclaimed rubber and powder obtained from grinding rubber waste. In order to study the effect of adding PVC on properties, four types of conveyor belts were made, with the structure of rubber, PVC and textile reinforcement. These have been subjected to certain mechanical tests, also being analyzed from the point of view of the behavior of the accelerated aging. The results obtained showed that the addition of PVC lead to a decrease in tensile stress for the strips made, but also an increase in the tensile strain. Additionally, the elasticity tests performed before and after the accelerated aging showed that the presence of PVC in the structure of the conveyor belts determined a substantial reduction of the aging process of the rubber in the conveyor belts. Under these conditions, it has been established that the use of PVC in the structure of rubber matrix conveyor belts is beneficial if conveyor belts are to be produced that are less subject to mechanical stress, but that work in conditions that can cause accelerated aging of materials. An analysis with the finite element method (FEM) of the test samples was also performed.

scholarly journals Senescent cells expose and secrete an oxidized form of membrane-bound vimentin as revealed by a natural polyreactive antibody

2017 ◽  
Vol 114 (9) ◽  
pp. E1668-E1677 ◽  
Author(s):  
David Frescas ◽  
Christelle M. Roux ◽  
Semra Aygun-Sunar ◽  
Anatoli S. Gleiberman ◽  
Peter Krasnov ◽  
...  
Keyword(s):  
Cell Surface ◽  
Human Fibroblasts ◽  
Accelerated Aging ◽  
Lung Fibroblasts ◽  
Mouse Lung ◽  
Cell Surface Antigens ◽  
Cell Accumulation ◽  
Novel Biomarkers ◽  
Membrane Bound

Studying the phenomenon of cellular senescence has been hindered by the lack of senescence-specific markers. As such, detection of proteins informally associated with senescence accompanies the use of senescence-associated β-galactosidase as a collection of semiselective markers to monitor the presence of senescent cells. To identify novel biomarkers of senescence, we immunized BALB/c mice with senescent mouse lung fibroblasts and screened for antibodies that recognized senescence-associated cell-surface antigens by FACS analysis and a newly developed cell-based ELISA. The majority of antibodies that we isolated, cloned, and sequenced belonged to the IgM isotype of the innate immune system. In-depth characterization of one of these monoclonal, polyreactive natural antibodies, the IgM clone 9H4, revealed its ability to recognize the intermediate filament vimentin. By using 9H4, we observed that senescent primary human fibroblasts express vimentin on their cell surface, and MS analysis revealed a posttranslational modification on cysteine 328 (C328) by the oxidative adduct malondialdehyde (MDA). Moreover, elevated levels of secreted MDA-modified vimentin were detected in the plasma of aged senescence-accelerated mouse prone 8 mice, which are known to have deregulated reactive oxygen species metabolism and accelerated aging. Based on these findings, we hypothesize that humoral innate immunity may recognize senescent cells by the presence of membrane-bound MDA-vimentin, presumably as part of a senescence eradication mechanism that may become impaired with age and result in senescent cell accumulation.

Quantitative Characterization of Sulfide Corrosion Reaction in Transformer Oil

2014 ◽  
Vol 705 ◽  
pp. 60-63 ◽  
Author(s):  
Hong Song Lian ◽  
Dong Sheng Zheng ◽  
Jiang Yan Yan ◽  
Qing Min Li ◽  
Yong Zhou ◽  
...  
Keyword(s):  
Accelerated Aging ◽  
Degree Of Polymerization ◽  
Transformer Oil ◽  
Sulfur Concentration ◽  
Quantitative Characterization ◽  
Corrosion Reaction ◽  
Sulfide Corrosion

This paper discusses the quantitative characterization of Cu-Sulfide reaction in transformer oil. Accelerated aging tests are carried on both the corrosive and noncorrosive oil samples, and by analyzing the characteristics, such as sulfur concentration, weight of the oil, degree of polymerization (DP), quantitative characterization of the Cu-sulfide deposition is established.

scholarly journals NMR-Enhanced Crystallography Aids Open Metal-Organic Framework Discovery Using Solvent-Free Accelerated Aging

2019 ◽  
Author(s):  
Christopher A. O’Keefe ◽  
Cristina Mottillo ◽  
László Fábián ◽  
Tomislav Friscic ◽  
Robert W. Schurko
Keyword(s):  
Solid State Nmr ◽  
Metal Organic Framework ◽  
Accelerated Aging ◽  
Solvent Free ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
It Application ◽  
Organic Framework

NMR-enhanced crystallography enables the characterization of a novel cadmium-based, open metal-organic framework (MOF) from a solvent-free "accelerated aging" process. Whereas accelerated aging was devised as a clean, mild route for making MOFs, these results highlight how it application in materials discovery and characterization is aided by a combination of X-ray diffraction and solid-state NMR spectroscopy.<br>

scholarly journals Avoidance of accelerated aging in schizophrenia?: Clinical and biological characterization of an exceptionally high functioning individual

2018 ◽  
Vol 196 ◽  
pp. 45-52 ◽  
Author(s):  
Barton W. Palmer ◽  
Raeanne C. Moore ◽  
Lisa T. Eyler ◽  
Luz L. Pinto ◽  
Elyn R. Saks ◽  
...  
Keyword(s):  
Accelerated Aging ◽  
Biological Characterization ◽  
High Functioning

scholarly journals Study of the performance of adobe brick coated for sustainable construction in the Algerian Sahara

2018 ◽  
Vol 106 (4) ◽  
pp. 401
Author(s):  
Nadir Kerroum ◽  
Brahim Nouibat ◽  
Azzedine Benyahia ◽  
Ali Redjem
Keyword(s):  
Capillary Rise ◽  
Accelerated Aging ◽  
Sustainable Construction ◽  
Capillary Absorption ◽  
Accelerated Aging Test ◽  
Algerian Sahara ◽  
Aging Test ◽  
Coating Composition ◽  
The Ideal

This article describes a study conducted to determine the ideal both traditional and stabilized composition of adobe as a building material, and to further refine an appropriate choice of coating composition for extended durability of these constructions in adobe: choose the suitable coating that fits the most with its substrate. The constructions in Z’gueg El Hadjadj [Laghouat town, Algeria] consist of adobe walls but also plaster that serves as a coating for these brick walls. The degradation phenomena of the building are considered in the adobe-coated couple, and consequently in the suitability of their compositions. The compatibility of plasters with adobes remains a major factor in the restoration and conservation of earthen constructions. This paper examines the results of the experimental characterization of the behavior of coated bricks, which consists of studying in the laboratory the water resistance: the drying-wetting test and the capillary rise test, as well as the complementary accelerated aging test: the abrasion test. These tests will be supplemented by another test, that of the adhesion, to see the compatibility of the coatings with their supports. The results, compared below, led to the conclusion that for capillary absorption and adhesion tests, a homogeneous coating in 3 layers could give more conclusive results. The drying-wetting test is recommended especially for bulk and surface treated samples.

scholarly journals Characterization of polypropylene pipes during accelerated aging in air and water

1996 ◽  
Vol 15 (4) ◽  
pp. 347-361 ◽  
Author(s):  
I. Groff ◽  
R. Franzese ◽  
L.D. Landro ◽  
M.R. Pagano ◽  
M. Genoni
Keyword(s):  
Accelerated Aging ◽  
Aging In Air
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