Results 101 to 110 of about 865,036 (193)

An Elementary Study of a Class of Dynamic Systems with Two Time Delays

Cubo, 2012
An elementary analysis is developed to determine the stability region of a certain class of ordinary differential equations with two delays. Our analysis is based on determining stability switches first where an eigenvalue is pure complex, and then ...
Akio Matsumoto, Ferenc Szidarovszky
doaj  

Orbital Evolution of Compact White Dwarf Binaries

, 2012
The new-found prevalence of extremely low mass (ELM ...
Badenes, Bildsten, Brown, Brown, D'Antona, David L. Kaplan, Deloye, Eisenstein, Hansen, Israel, Justin D. R. Steinfadt, Kalirai, Kasliwal, Kawka, Kilic, Kilic, Kilic, Kilic, Kilic, Kilic, Kulkarni, Landau, Lars Bildsten, Levitan, Marsh, Marsh, Marsh, Mullally, Nomoto, Paczyński, Papaloizou, Parsons, Paxton, Roelofs, Shen, Steinfadt, Steinfadt, Strohmayer, Strohmayer, Strohmayer, Tutukov, van Kerkwijk, van Kerkwijk, Vennes   +43 more
core   +1 more source

Thermal degradation assessment, impact strength, and hardness of combination epoxy and polystyrene powder composite

Kuwait Journal of Science
The present study investigates the reactions of polystyrene and epoxy/polystyrene powder composites, exploring different weight percentages (8%, 12%, and 16%) of polystyrene during decomposition under highly elevated temperatures within a nitrogen ...
Jubier N.J., Al-Jorani K.R., Ali A.A.
doaj   +1 more source

Ferrocene and Ferrocenium Modified Clays and Their Styrene and EVA Composites [PDF]

, 2007
In this work, ferrocene- and ferrocenium-containing salts were employed to modify montmorillonite. X-ray measurements show an increase in the interlayer spacing upon clay modification, which means that the larger and more organophilic cations were ...
Manzi-Nshuti, Charles, Wilkie, Charles A.   +1 more
core   +1 more source

Toughening epoxy resins with soluble hyperbranched poly (aryl ether ketone): enhanced mechanical properties and thermal stability

Advanced Manufacturing: Polymer & Composites Science
The limited toughness of epoxy resins (EP) significantly hinders their application. While hyperbranched polymers are commonly employed as toughening agents, their poor solubility often leads to drawbacks, including a marked reduction in glass transition ...
Xiyan Li, Feng Bao, Shuang’er Li, Tang Zhu, Jiali Yu, Qing Zhang, Huichao Liu, Caizhen Zhu, Jian Xu   +8 more
doaj   +1 more source

Remarkable improvement in drilling fluid properties with graphitic-carbon nitride for enhanced wellbore stability

Heliyon
This study examines the viability of using graphitic-Carbon Nitride (g-C3N4) nanomaterial as shale stabilizer drilling fluid additive having applications in the oil and gas wells drilling.
Anwar Ahmed, Erum Pervaiz, Iftikhar Ahmed, Tayyaba Noor   +3 more
doaj   +1 more source

The Stability of Heavy Objects with Multiple Contacts [PDF]

, 1995
In both robot grasping and robot locomotion, we wish to hold objects stably in the presence of gravity. We present a derivation of second-order stability conditions for a supported heavy object, employing the tool of Stratified Morse theory.
Burdick, Joel, Mason, Richard, Rimon, Elon   +2 more
core  

The Effects of Mixed Robinia pseudoacacia and Quercus variabilis Plantation on Soil Bacterial Community Structure and Nitrogen-Cycling Gene Abundance in the Southern Taihang Mountain Foothills

Microorganisms
Mixed forests often increase their stability and species richness in comparison to pure stands. However, a comprehensive understanding of the effects of mixed forests on soil properties, bacterial community diversity, and soil nitrogen cycling remains ...
Yi Yang, Jing Chen, Yiwei Zheng, Rui Jiang, Yuqiang Sang, Jinsong Zhang   +5 more
doaj   +1 more source

Printability assessment and mechanical properties of filament-free 3D printed polyether-ether-ketone (PEEK) composites

Journal of Materials Research and Technology
The study focuses on the novel development and printability of hydroxyapatite/magnesium-orthosilicate (HAp/Mg2SiO4) reinforced PEEK composites using filament-free 3D printing (3DP) and an evaluation of its mechanical properties toward advancing ...
Praveen Jeyachandran, Si Jian Hui, Lionel Yan Jin Lee, Balamurugan Vellayappan, Jerry Ying Hsi Fuh, James Thomas Patrick Decourcy Hallinan, A Senthil Kumar, Naresh Kumar   +7 more
doaj   +1 more source

Outstanding thermal stability of cold-rolled Al–Y alloy revealed using in-situ synchrotron X-ray diffraction and ex-situ microscopy

Journal of Materials Research and Technology
This paper describes the main results from an experimental investigation into the thermal stability of a cold-rolled Al–Y alloy. Tensile tests performed on specimens of the alloy and pure Al in annealed states reveal superior anti-softening properties of
Mengmeng Wang, Junjie Wu, Shuang Yang, Marko Knezevic, Zhongjia Huang, Yu Zhao, Tong Liu, Baoxiang Shen, Jun Wang   +8 more
doaj   +1 more source