Abstract: The present invention relates to improved dental compositions and methods for bleaching teeth. More specifically, this invention is directed towards hydrogen peroxide-containing compounds that are maintained at a substantially constant pH range of 6.0-10.0 during the tooth-bleaching procedure in the presence of a calcium chelating agent.

Abstract: A cannula valve arrangement made from a suitably resilient polymeric material including a body (10) having a substantially cylindrical cavity (16) for receiving a medical apparatus hub (32, 34) and a sleeve (14) having a bore (18) for receiving a cannula (28), which is open into the body cavity. A zone (20) of the body wall which defines the cavity (16) is convexly bulged from the body (10) and is adapted to snap from its convex shape into a concave shape in the body cavity (16) when pressed over-center into the body to close the bore (18) of the sleeve (14) to the cavity until again moved outwardly from the cavity (16).

Abstract: The present invention relates to improved dental compositions and methods for bleaching teeth. More specifically, this invention is directed towards hydrogen peroxide-containing compounds that are maintained at a substantially constant pH range of 6.0-10.0 during the tooth-bleaching procedure in the presence of a calcium chelating agent.

Abstract: The present invention relates to improved dental compositions and methods for bleaching teeth. More specifically, this invention is directed towards hydrogen peroxide-containing compounds that are maintained at a substantially constant pH range of 6.0-10.0 during the tooth-bleaching procedure in the presence of a calcium chelating agent.

Abstract: The present invention relates to improved dental compositions and methods for bleaching teeth. More specifically, this invention is directed towards hydrogen peroxide-containing compounds that are maintained at a substantially constant pH range of 6.0-10.0 during the tooth-bleaching procedure in the presence of a calcium chelating agent.

Abstract: The present invention relates to improved dental compositions and methods for bleaching teeth. More specifically, this invention is directed towards hydrogen peroxide-containing compounds that are maintained at a substantially constant pH range of 6.0-10.0 during the tooth-bleaching procedure in the presence of a calcium chelating agent.

Abstract: The present disclosure describes a system wherein a drug or other fluid to be delivered to a specific desired location within the body is stored in a reservoir that is directly displaced by a force to infuse the drug from the device into the patient. Several specific methods are used to displace the reservoir, including, generally, hydraulic displacement, mechanical screw-type displacement, and spring force displacement of the fluid reservoir.

Abstract: An ionic conductor has been developed which exhibits both hydrogen ion conductivity and electronic conductivity. The conductor is a perovskite-type oxide represented by the general formula: ABO3 where A consists of at least one element selected from the group consisting of Ba, Ca, Mg and Sr and B is Ce1-xMx where M is a multivalent dopant metal, preferably Eu or Tb, and x is greater than 0 and less than 1. It is particularly useful in processes in which hydrogen is separated from a hydrogen-containing gas, e.g. in conversion of natural gas, operation of hydrogen fuel cells, etc.

Abstract: According to the present invention there is provided a heat mode imaging element for making a lithographic printing plate having on a lithographic base with a hydrophilic surface a first layer including a polymer, soluble in an aqueous alkaline solution but not in water and less than 5% by weight versus the polymer, soluble in the aqueous alkaline solution of a hydrophilic polymer and a top layer on the same side of the lithographic base as the first layer which top layer is IR-sensitive and unpenetrable for or insoluble in an alkaline developer wherein said first layer and said top layer may be one and the same layer; characterized in that said top layer contains a compound selected from the group consisting of a polymer in an amount from 30 mg to 500 mg/m2, a triaryl methane dye and a phthalocyanine dye.

Abstract: A loudspeaker mounting plate having metal rods embedded in a body in such a way that both rigidity and internal damping are maximized. A circular hole is included to allow for the mounting of a loudspeaker. Two sets of metal rods are utilized, the first being placed partially under the loudspeakers frame for maximum surface hardness, and the second being used for bracing the width of the plate. The use of two materials with different properties results in a structure that is highly resistant to vibration.

Abstract: Adaptors for interchangeably connecting any of a plurality of clamping fixtures to various beam clamp assemblies include an adaptor block or body, a fastener attached to the adaptor block for releasably securing the adaptor block to a jaw of a beam clamp assembly, and a connector on the adaptor block for releasably attaching a workpiece clamping fixture to the adaptor block.

Abstract: A flexible steam cracking process for hydrocarbon feeds comprises injection of particles with an average size of between 0.02 mm and 4 mm, at a circulation rate in indirect transfer line exchangers (4) of 20 to 180 m/s, and in a sufficient quantity to limit the increase in temperature at the outlet to the exchangers (4) to a value of less than 100.degree. C. per month, into at least one point upstream of an indirect transfer line exchanger (4), cracking zone (2) remaining in communication with downstream means (6) for the treatment of cooled effluents. At least 70% by weight of the quantity of injected particles is introduced between the outlet to the cracking zone (2) and the tubes of the indirect transfer line exchanger (4). Chemical decoking is carried out in the tubes of the cracking zone at time intervals of less than 4 months by establishing accelerated coke gasification conditions, for example by injecting compounds which catalyse gasification by steam, or by decoking in air and/or steam.

Abstract: A facility and a process for steam cracking include controlled injection of solid particles into a transfer line exchanger (3). The particles are injected via injection lines, numbering between 1 and 8, just upstream of an impact-diffuser (6) comprising solid surfaces disposed on either side of the line for transfer of the cracked gases to the exchanger; this impact-diffuser is located in the inlet cone (2) of the exchanger, is permeable to the gases via a plurality of passages and at least 70% opaque viewed from the transfer line.

Abstract: A play structure building panel comprising of integrally connected spaced-apart curved parallel inner and outer panel walls joined by two side edges and end two end edges. One of the side edges and at one of the end edges have an integral connection means extending therefrom to mate with complementary connection receiving means on an identical panel. Accordingly, one of the side edges and one of the end edges of the panel also have the complementary connections means to receive the connection means extending from another identical panel. Therefore, any number of the panels may be connected to other identical panels along any of the side or end edges.

Abstract: Process for managing concurrent access permitting the successive input or storage of several slave devices (receiver/transmitter) in the field of action of a master device (emitter/reader) so as to render possible the exchange of data in two directions whilst guaranteeing coherent transmission between the master device and each slave device. This process is based on a double temporary address of the slave devices. Upon each command emitted by the reader, two values are transmitted, the first comprising the identification of the next free number and the second the number of the receiver to which the command is directed.

Abstract: A mechanism including a sustaining bar (112) directly engaging a row of damper supports (104); and a harmonic bar directly engaging a row of escapements (13) each of which is combined with one of the damper supports. Both bars (111, 112) are actuated by a common pedal (1) to which they are connected by a linkage system (18, 20, 5) linking the movement of the harmonic bar (111) to that of the sustaining bar (112) so that when the pedal is depressed beyond a so-called "harmonic" position in which the pedal is half-depressed, the sustaining function is applied to all the notes whose keys are depressed, and once the pedal has been fully depressed and is therefore in a so-called "forte" position, then very slightly released, all the escapements are in engagement with the harmonic bar.

Abstract: The present invention relates to improved dental compositions and methods for bleaching teeth. More specifically, this invention is directed towards hydrogen peroxide-containing compounds that are maintained at a substantially constant pH range of 6.0-10.0 during the tooth-bleaching procedure in the presence of a calcium chelating agent.