The invention relates to a semiconductor laser with a distributed reflector comprising a semiconductor junction, one of whose semi-transparent mirrors is a split face of the semiconductor in which is integrated a light emitting junction with epitaxial layers. The active layer of this junction is coupled to a waveguide integrated in a dielectric medium, on one face of which is engraved a grating forming a distributed reflector playing the part of the second mirror. The reflector, when functioning...

Multiple stations exchange information without central supervision. Stations requiring a cycle of access time on a shared time-divided bus participate in a cyclic access resolution process. The station having highest priority for a next bus cycle indicates its precedence to the other stations, and assumes exclusive use of the bus in the next cycle. The bus may comprise separate sections for data and response communications. Separate access resolution processes are conducted relative to each sect...

A heater for heating liquids such as water in an aquarium comprises a water-impermeable housing including a heating section for immersion in the water. Within the heating section of the housing is a flexible, distributed planar heating element. The housing is resistant to breakage from mechanical and operating abuse and has a high heat transfer coefficient and high heat distortion temperature. To prevent the housing from melting when a control element of the heater malfunctions, preferably the a...

A distributed charge for use in producing a very sharp impulse for seismic prospecting comprises a series of lump explosive charges placed preferably of the order of at least 20 feet apart in a fluid in a well, connected with novel timed fuses. These fuses are each made of a short top section of a small diameter detonating linear explosive and a considerably longer, lower section which is a non-detonating linear deflagrator, terminating in a blasting cap inserted in the next lower lump explosive...

A filter operable in a microwave frequency band comprises a conductive closed housing having a bottom wall, an upper wall and side walls between said bottom wall and the upper wall, a plurality of resonators fixed on a straight line on the bottom wall inside of the housing, one end of each resonator being grounded to the bottom wall and the other end of each resonator being free standing, each resonator having at least an elongated center conductor and a dielectric body covering the center condu...

A computer-implemented method uses out-of-band notifications to reduce overhead associated with notifying a client process of events that have occurred at a server process in a computer system employing a request-response protocol. Initially, a notification transmission connection is established between the client process and the server process using the request-response protocol. Thereafter, notifications are transmitted from the client process to the server process using the connection, and wi...

A pre-compiler program for operation with a conventional object oriented compiler program modifies the original source code to add new statements which adapt the source code for multiple processor operation.

A system for controlling the operation of a laboratory with a fume hood having a sash. The system includes an intelligent occupancy monitor mechanism. The system includes an intelligent sash closure mechanism. The producing mechanism and the controlling mechanism form a fully distributed intelligent non-hierarchical architecture. The system includes a network to which the producing mechanism and the controlling mechanism are connected to communicate with each other. A method for controlling air ...

The present invention provides a method and system in a telecommunications network for restoring network element failures or network link failures in case not all network elements possess distributed restoration capabilities, for example during an introduction-phase of the distributed restoration system, or in case a network consists of different kinds of network elements provided by different providers, i.e. a multivendor network. The distributed restoration of network elements which do not pos...

An object present on a first computer is replicated on a second computer. The object includes pointers to program code within the memory space of the first computer. Data elements of said object are stored in a message which is transmitted from the first computer to the second computer. The message is received at the second computer, creating a dummy object which is named and dimensioned to correspond to the object, but which does not include the data values on the second computer. The data valu...