摘要:
A combination of silicon processing technology advances and increased understanding of the mechanisms underlying phosphene generation in human retinas by surface electrical stimulation has now made it possible to conceive of a chronically implantable retinal prosthesis for the blind which will restore some useful vision to patients over at least several degrees of their former field of view. These thin, strong, and flexible epiretinal devices are constructed of or encapsulated in known biocompatible materials which will have a long working life in the eye's saline environment. The function of the implants is to electrically stimulate the ganglion cell layer at the surface of the retina using controlled current sources. Due to the exceptionally low mass of the implant and its flexible, nearly planar form, patient discomfort and fluid drag caused by the implant minimized. These physical atttributes also substantially reduce the potential of harm to the most delicate structure of the eye, the retina, and therefore enhance the long term safety and biocompatibility of the device. Since no micro-cables are required to be attached to the device, and its overall form and edges are rounded, the device is not expected to stress the retina during chronic implantation. A provision is also made for nutrients to reach the retinal cells underneath the device to assure their long-term health.
摘要:
A process for the preparation of an amorphous, vulcanizable, elastomeric copolymer by copolymerization of ethylene and at least one .alpha.-olefin having from 3 to 10 carbon atoms e.g. propylene and optionally in the presence of at least one non-conjugated diene, using as catalyst a transition metal composition which is the product of reacting a transition metal complex of the general formulaR.sub.m MX.sub.p (1)with a substantially inert matrix material having a hydroxylic surface which is free from adsorbed water, where M is a transition metal of Groups IVA to VIA of the Periodic Table of the Elements, R is a hydrocarbon group or substituted hydrocarbon group, X is a monovalent ligand and m and p are integers, m having a value from 2 to the highest valency of the metal M, and p having a value from 0 to 2 less than the valency of the metal M, the copolymerization being effected in a diluent comprising the .alpha.-olefin or mixture of .alpha.-olefins which is in liquid form under the prevailing polymerization conditions.
摘要:
A system, method and computer program product for extracting information from a telecommunications invoice is provided. According to an exemplary embodiment of the present invention, a method may include: receiving a telecommunications invoice data stream in a first data format; analyzing the telecommunications invoice data stream to determine the first data format; modeling the telecommunications invoice data stream; and mapping the modeled telecommunications invoice data stream to a normalized data format. According to another exemplary embodiment of the present invention, the method may include: where the modeling of the telecommunications invoice data stream may further include any of: creating a model for the first data format; modeling the telecommunications invoice data stream according to the model; and/or modeling the telecommunications invoice data stream with an intelligent adapter.
摘要:
Polymerization of ethylene using a transition metal hydrocarbyl complex, especially zirconium tetrabenzyl, supported on alumina consisting of substantially spherical particles having diameters in the range 20-150 .mu.m. The particulate polymer produced by the process contains substantially no "fines" (i.e. particles
摘要:
A microelectromechanical system (MEMS) includes a conductor with improved reliability. The conductor flexes with a moving member in the MEMS device, and the improved reliability is achieved through material selections that provides increased fatigue resistance, reduced crack propagation, and/or mechanisms for improved live at a given strain level. The conductor may include a single material, or may include layers of different materials.
摘要:
Disclosed is a data processing system and a method of managing a queue 130 of items for processing in which the expected time an item will spend on the queue 130 is calculated 209 when an item is received to be placed on a queue 130. If this exceeds an upper limit, then the item is rejected 213 and the queue 130 is purged 215 of all items. An indication is provided to the sources of the items that were purged that this has occurred. In this way, it is possible to detect the difference between a queue 130 which is longer, but dynamic, and one which is shorter, but static. The method is applied to management of requests for a communications link between local and remote systems.
摘要:
A system, method and computer program product for extracting information from a telecommunications invoice is provided. According to an exemplary embodiment of the present invention, a method may include: receiving a telecommunications invoice data stream in a first data format; analyzing the telecommunications invoice data stream to determine the first data format; modeling the telecommunications invoice data stream; and mapping the modeled telecommunications invoice data stream to a normalized data format. According to another exemplary embodiment of the present invention, the method may include: where the modeling of the telecommunications invoice data stream may further include any of: creating a model for the first data format; modeling the telecommunications invoice data stream according to the model; and/or modeling the telecommunications invoice data stream with an intelligent adapter.
摘要:
Disclosed is a communication server that includes a message transfer unit that transfers messages sent between a first user communicating under a first communication system and a second user communicating under a second communication system. For example, the communication systems could each comprise a plurality of mobile wireless transceivers and a plurality of land-based transceivers that are used by emergency-response organizations. These communication systems may be incapable of communicating directly with each other. The communication server also includes a translator connected to the message transfer unit. The translator translates messages sent from the first communication system into a format compatible with the second communication system and vice versa. The communication server also has a voice-over-Internet-protocol (VoIP) unit connected to the message transfer unit, so that messages are transmitted through the communication server in a VoIP format. Thus, messages are transferred between the communication systems using discrete Internet protocol addresses.
摘要:
Transition metal compositions which are the products of reacting a transition metal complex of the formula RmMXp with a substantially inert matrix material having a hydroxylic surface which is free from adsorbed water, wherein M is a transition metal of Groups IVA to VIA, R is a hydrocarbon group, X is a monovalent ligand and m and p are integers, m having a value from 2 to the highest valency of the metal M and p having a value of from 0 to 2 less than the valency of the metal M, except when M is a metal of Group VIA, when p is 0. When present, ligand X is preferably halogen. The compositions are useful as initiators, particularly for the polymerization of olefinically unsaturated monomers, for example ethylene and propylene.