Micromagnetic simulation work was performed on permalloy asymmetric magnetic rings to observe its magnetic switching behavior. By controlling the lateral geometric features, the ring asymmetry, and the thickness of the film, a local vortex-free reversal Momelotinib clinical trial process and well-controlled

chirality of flux closure can be achieved. Furthermore, a domain wall trapping feature is also observed at the narrow arm of the asymmetric ring, which corresponds to the phenomenon that the magnetic domain wall does not annihilate until the magnetization in the wide arm reversed in a relatively large magnetic field. A phase diagram of the asymmetric ring switching behavior shows that the switching regimes (e.g., the domain wall propagation or nucleation annihilation) of the asymmetric rings and the domain wall pinning depend mainly on the film thickness. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3197413]“
“Ethylene-propylene-diene-monomer (EPDM) rubber is an important commercial polymer. The

vulcanization process significantly changes its thermal, mechanical, and vulcametric properties. This study was carried out to find optimum formulation of EPDM composite for a better application in automotive industry. Sixteen EPDM polymer samples having different 5-ethylidene www.selleckchem.com/products/DAPT-GSI-IX.html 2-norbornene (ENB) and ethylene contents were vulcanized with different types and compositions of pet-oxide and coagents. The mechanical and vulcametric properties of these samples were measured and compared. The

type of peroxide, coagent, and EPDM grade affected the mechanical, thermal, and vulcametric properties of the EPDM rubber to some extend. Use of aromatic peroxide and coagent increased the thermal stability slightly. Mechanical properties were changed very slightly with the change of peroxide type for the same content of peroxide and coagent. Scorch time and cure time decreased with initial increase of the peroxide content. EPDM compound vulcanized with BBPIB peroxide and TAC/S coagent has higher cure time than EPDM compound vulcanized with DMBPHa peroxide and TMPTMA coagent. Coran method was used for the modeling of experimental data. Velocity constant for the formation of peroxide radical and polymer radical were found for each case. SIS3 datasheet (C) 2009 Wiley Periodicals, Inc. Appl Polym Sci 112:1891-1896, 2009″
“The mechanical properties and electronic structure of diamondlike BC5 are studied by ab initio method. The results for elastic moduli, stress-strain relationships, and ideal strengths are presented. The calculated properties agree well with the existing experiments. BC5 possesses very large elastic moduli and ideal strengths, suggesting its intrinsical superhard nature. Its ideal tensile strengths are much larger than ideal shear strengths. Electronic structures show that strong covalent bond network through sp(3) hybridization is the origin of excellent mechanical properties of BC5.