Abstract: The present invention is directed to a tire having a tread comprising two shoulder portions and a center portion axially between the two shoulder portions, wherein at least one of the shoulder portions comprises a first rubber composition and the center portion comprises a second rubber composition different from said first rubber composition. The first rubber composition has a shear storage modulus which is at least 10% lower than the shear storage modulus of the second rubber composition, and the second rubber composition has a glass transition temperature which is at least 5% higher than the glass transition temperature of the first rubber composition.

Abstract: There is provided an apparatus and method, the apparatus comprising a power input and a switch isolation circuit to provide isolation between the power input and a protected switch responsive to a timing signal. The switch isolation circuit comprises a switch isolation charge store, and a buffer circuit to receive power from the switch isolation charge store and coupled between the timing signal and the protected switch. The switch isolation circuit is configured to, in response to the timing signal having the first value, operate in a powered mode in which the switch isolation charge store receives power from the power input; and, in response to the timing signal having the second value, operate in an isolation mode in which the switch isolation charge store is isolated from the power input.

Abstract: There are provided apparatuses and methods. The apparatus comprise a power input and a power output and a first isolation circuit comprising a charge store. The first isolation circuit is configured to switch between a first mode and a second mode at a switching frequency. In the first mode the charge store is coupled to the power input and is electrically isolated from an intermediate power node. In the second mode the charge store is coupled to the intermediate power node and is electrically isolated from the power input. The apparatus further comprises a second isolation circuit electrically coupled to the intermediate power node and the power output. The second isolation circuit is configured to output an output voltage at the power output. The second isolation circuit is configured to generate the output voltage by filtering the intermediate voltage signal to reduce signal components at the switching frequency.

Abstract: A process for producing an epitaxial layer of gallium nitride (GaN). A film of a dielectric whose thickness is about one monolayer is formed on a surface of a substrate. A continuous gallium nitride layer is then deposited on the dielectric film at a temperature sufficiently low to suppress island formation of the gallium nitride. The deposited gallium nitride layer is annealed at a temperature sufficiently high to promote island formation of the gallium nitride. An epitaxial regrowth with gallium nitride at the end of a spontaneous in situ formation of islands of gallium nitride then takes place. This method makes it possible to avoid having to use ex situ etching of masks by photolitographiy or chemical ethching techniques.

Abstract: The invention concerns a method for producing a gallium nitride (GaN) epitaxial layer characterised in that it consists in depositing on a substrate a dielectric layer acting as a mask and depositing on the masked gallium nitride, by epitaxial deposit, so as to induce the deposit of gallium nitride patterns and the anisotropic lateral growth of said patterns, the lateral growth being pursued until the different patterns coalesce. The deposit of the gallium nitride patterns can be carried out ex-situ by dielectric etching on in-situ by treating the substrate for coating it with a dielectric film whereof the thickness is of the order of one angstrom. The invention also concerns the gallium nitride layers obtained by said method.

Abstract: The invention concerns a method for producing a gallium nitride (GaN) epitaxial layer characterised in that it consists in depositing on a substrate a dielectric layer acting as a mask and depositing on the masked gallium nitride, by epitaxial deposit, so as to induce the deposit of gallium nitride patterns and the anisotropic lateral growth of said patterns, the lateral growth being pursued until the different patterns coalesce. The deposit of the gallium nitride patterns can be carried out ex-situ by dielectric etching or in-situ by treating the substrate for coating it with a dielectric film whereof the thickness is of the order of one angstrom. The invention also concerns the gallium nitride layers obtained by said method.

Abstract: Pressure-sensitive mark-recording systems of chromogens comprised of diphenylmethane derivatives in solution with selected diester solvents is disclosed as well as pressure-sensitive mark-recording systems comprised of (a) sheet material, (b) mark-forming components supported by the sheet material and arranged in juxtaposition but in unreactive condition, a chromogen, and an acid clay sensitizer for the chromogen, and (c) the solvent supported by the sheet material but separated from the sensitizing agent by a physical barrier which is rupturable on the application of a marking instrument to the sheet material.

Abstract: A pressure-sensitive mark-recording system comprising (a) sheet material, (b) mark-forming components supported by the sheet material and arranged in juxtaposition comprising a chromogen material and an acid clay sensitizing agent for the chromogenic material which produces a color from the chromogenic material when brought into contact with the chromogenic material in the presence of a solvent for the chromogenic material with the solvent supported by the sheet material but separated from its sensitizing agent by a physical barrier which is rupturable on the application of the marking instrument to the sheet material, the invention characterized in that the liquid solvent is a solvent comprised of a blend of aromatic hydrocarbon components in which at least one-half the carbon atoms are benzenoid or a mixture of such hydrocarbons, and a diester component.

Abstract: A rotary internal combustion motor comprises a toroidal chamber with symmetry of rotation to the rotor axis, in which pistons travel and comprising locking and unlocking means for making the said pistons alternately solid with the rotor and the housing. The locking means include arcuate formations on swivel pins which travel with the pistons and can engage complementary grooves on radially floating members on the housing and rotor.