Jordan University of Science and Technology

About: Jordan University of Science and Technology is a education organization based out in Irbid, Irbid, Jordan. It is known for research contribution in the topics: Population & Medicine. The organization has 7582 authors who have published 13166 publications receiving 298158 citations. The organization is also known as: JUST.

Properties of tire rubber ash mortar

Abstract: The present study explores the effect of tire rubber ash (TRA) filler on different properties of Portland cement mortar. The properties investigated include air content, setting time, compressive and flexural strength, freezing and thawing damage, and chloride-ion penetration. The TRA was obtained by incinerating bulk quantities of tire rubber chips in an oven at a controlled temperature of 850 °C for 72 h. The TRA filler was utilized as partial replacement of sand in mortar mixtures at four levels: 2.5%, 5%, 7.5%, and 10% by weight. The water to cementitious materials ratio used in the mortar mixtures was 0.65. The test results showed that TRA could be used as a partial replacement of sand in mortar mixtures to produce workable mortar. The air content of the fresh mortar decreased with increasing TRA content. The initial and final setting time of fresh paste increased with increasing TRA content. The mortar containing different TRA replacement levels showed higher compressive strength at various curing periods up to the age of 90 days compared with control mortar. Also, the flexural strength of the TRA mortar was higher than that of control mortar. The mortar containing 5% and 10% TRA showed higher resistance to freezing and thawing damage and chloride-ion penetration than that of control mortar.

Effects of acute and repeated treatment with the biased mu opioid receptor agonist TRV130 (oliceridine) on measures of antinociception, gastrointestinal function, and abuse liability in rodents.

Abstract: Rationale:TRV130 (oliceridine; N-[(3-methoxythiophen-2-yl)methyl]-2-[(9R)-9-pyridin-2-yl-6-oxaspiro[4.5]decan-9-yl]ethanamine) is a novel mu opioid receptor (MOR) agonist that preferentially activa...

A Quantitative Investigation of the Acceptable Risk Levels of Object-Oriented Metrics in Open-Source Systems

Abstract: Object-oriented metrics have been validated empirically as measures of design complexity. These metrics can be used to mitigate potential problems in the software complexity. However, there are few studies that were conducted to formulate the guidelines, represented as threshold values, to interpret the complexity of the software design using metrics. Classes can be clustered into low and high risk levels using threshold values. In this paper, we use a statistical model, derived from the logistic regression, to identify threshold values for the Chidamber and Kemerer (CK) metrics. The methodology is validated empirically on a large open-source system-the Eclipse project. The empirical results indicate that the CK metrics have threshold effects at various risk levels. We have validated the use of these thresholds on the next release of the Eclipse project-Version 2.1-using decision trees. In addition, the selected threshold values were more accurate than those were selected based on either intuitive perspectives or on data distribution parameters. Furthermore, the proposed model can be exploited to find the risk level for an arbitrary threshold value. These findings suggest that there is a relationship between risk levels and object-oriented metrics and that risk levels can be used to identify threshold effects.