Thermocycling simulates the temperature dynamics in the oral environment. With direct bonding, thermocycling reduces the bond strength of orthodontic adhesives to tooth structure. The purpose of this study was to evaluate the shear bond strengths (SBS) of one direct and two indirect bonding methods/adhesives after thermocycling. Sixty human premolars were divided into three groups. Teeth in gro...

Research on chlorine-free conversions of P4 into organophosphorus compounds (OPCs) has a long track record, but methods that allow desirable, direct P-C bond formations have only recently emerged. These include the use of metal organyls, carbenes, carboradicals, and photochemical approaches. The versatile product scope enables the preparation of both industrially relevant organophosphorus compo...

We report an unexpected temperature dependence of the electron-spin-resonance linewidth DHPP for the silicon D-center resonance in polycrystalline silicon. Distinct temperature dependences were found in asprepared and hydrogen-passivated polycrystalline silicon. This observation invalidates the identification of this resonance with a static dangling bond, and changes the perspective on similar ...

This thesis examines the packaging of high-temperature SiC power electronic devices. Current-voltage measurements were conducted on as-received and packaged SiC power devices. The planar structure was introduced and developed as a substitution for traditional wire-bonding vertical structure. The planar structure was applied to a high temperature (>250C) SiC power device. Based on the current-vo...

A palladium-pivalic acid cocatalyst system has been developed that exhibits unprecedented reactivity in direct arylation. This reactivity is illustrated with the first examples of high yielding direct metalation-arylation reactions of a completely unactivated arene, benzene. Experimental and computational evidence indicates that the pivalate anion is a key component in the palladation/C-H bond ...

The interlayer bonding strength is an essential property of geogrid-reinforced asphalt. To study the characteristics asphalt, direct shear and oblique tests were carried out in laboratory. interlaminar asphalt was lower than that unreinforced carbon–carbon sample highest, second, carbon–glass lowest. stiffness geogrid affects strength. strengths AC-20C samples higher AC-13C samples. almost same...