摘要:
A train control system for controlling trains traveling in a track network including tracks with signals associated therewith. The system includes an on-board track database, a positioning system and an on-board control system. The on-board control system receives position data and automatically brakes the train prior to encountering an upcoming signal based upon specified data points. The train is not automatically braked if certain conditions are met. A method for controlling a train traveling in a track network is also disclosed.
摘要:
A method for securing the chronological integrity of files prior to archiving of the files, involving an exchange between a client and a Time Source Provider, the method comprising the steps of: the client generating a Public and a Private Key pair; the client generating attributes of the to be archived files; encrypting the client's files utilizing the client's Public Key; transmitting the encrypted data attributes and key signature to said Time Source Provider; the Time Source Provider creating a TimeMap containing the current time, time calibration data, file attributes and client encryption key signature; and the Time Source Provider providing the client data and time map back to the client.
摘要:
A system and method for anticipating and controlling overspeed in a combined cycle turbine of the type having a gas turbine with a fuel flow control valve and a steam turbine with at least one steam control valve both disposed on a single shaft and having a heat recovery steam generator heated by said gas turbine and connected to supply steam to the steam control valve, the combined cycle turbine having a unified control system and driving a load. Below a preselected shaft speed the gas turbine fuel command signal controls power. Above the preselected shaft speed the steam turbine speed signal also controls power. Anticipation of overspeed under severe transient load changes, such as loss of electrical load, is provided by a power load unbalance system, wherein gas turbine power and steam turbine power responsive signals are summed after proportionately scaled power responsive signals exceed load by a preselected amount, whereby appropriate action is taken to reduce power before significant overspeed can occur.
摘要:
An improved combined cycle plant with a gas turbine, a steam turbine and a generator arranged in tandem on a single shaft system in the order aforementioned, including a single thrust bearing with rigidly coupled rotor members. A thrust bearing for the shaft system is supported in a bearing standard keyed to the foundation on the side of the steam turbine toward the gas turbine to restrain axial movement. The thrust bearing is preferably located in the compressor inlet of the gas turbine. The steam turbine comprises a first casing with the hihg pressure section supported in a bearing standard keyed to the foundation adjacent the thrust bearing. The second casing with the low pressure section is keyed to the foundation at its outlet in the center of the exhaust hood. In a preferred arrangement with a single flow low pressure turbine section, the second casing combines an intermediate pressure turbine section adjacent the generator receiving steam from the reheater. In a modified arrangement with a double flow low pressure section, the intermediate pressure turbine section turbine section is combined with the high pressure turbine section in the first casing.
摘要:
An electronic handheld talking translator including a speech synthesis integrated circuit device. The speech synthesis integrated circuit device includes a digital filter, a voiced/unvoiced excitation circuit, a speech parameter interpolator, an input parameter decoder, a digital-to-analog converter, a speaker and associated timing circuits. A non-volatile memory stores digital data representative of the correct spellings of selected words in a foreign language and the model vocal tract control data necessary to control the speech synthesis circuit in a manner to cause the selected words to be audibly pronounced by the translator.
摘要:
Phosphoric acid is prepared from phosphate rock and sulfuric acid by using a reaction train comprising a dissolving slurry and a crystallization slurry maintained at different sulfate levels. Both inter and intra vessel circulation are used at high rates to minimize reagent concentration gradients and temperature gradients and provide a suitable crystallization environment. Preferably, the intra vessel circulation is substantially in plug flow, as through a draft tube.
摘要:
A process control system capable of executing a function after initiation thereof by a user includes a computer having a memory and a processing unit. A security module stored in the memory of the computer and adapted to be executed on the processing unit of the computer analyzes security information to determine whether the function should be executed. The security information is collected contemporaneously with the initiation of the function and in association therewith.
摘要:
Edible seeds and nuts having been stored at low preserving temperatures are treated so as to produce a roasted, salted product wherein the salt is strongly held without the use of oil additives. The process utilizes temperature-conditioning storage, a heat treatment which expands surface cells, spray treatment with an unsaturated sodium chloride solution, followed by roasting.
摘要:
Improved method and apparatus for controlling thermal stress on component parts of a steam turbine while providing maximum loading and unloading rates during startup, shutdown, and other periods of load change. From monitored and derived quantities, a loading rate is calculated for each of a plurality of preselected turbine component parts and the lowest rate is selected for control. Simultaneously, and in concert with load change calculation and execution, the steam admission mode of the turbine is automatically directed to either the partial arc mode or the full arc mode as necessary to reduce stress as compared with a preselected and adaptive stress reference value.