222results about How to "Speed up the descent" patented technology

A method for reducing vortex promotion of a rotor blade used in high core PR fans comprises shifting a curvature distribution of a blade section immediately adjacent to the hub such that a major turning of the suction side of the section is located near a trailing edge of the blade.

Multi-drop communications channels can have significantly deep notches in their frequency response causing a corresponding limitation of the effective data transmission rate. A special time-ordered coding method is described which results in the emitted spectrum of the data stream transmitted into the channel having a notch at the same frequency as the notch in the channel frequency response, permitting channel receivers to successfully decode the transmitted data stream. The described coding method may be applied at various multiples of the channel notch frequency to support different throughput rates, and may be combined with other coding techniques such as group or vector signaling codes.

A two piece dual mode earplug including an integrally molded elongated member having a nose end and an open rear end and a channel extending through. An integrally molded insert member is formed with a base portion and a rod portion and with the rod portion seated within the open rear end of the elongated member and includes an attenuation filter integrally molded as part of the rod portion and includes first and second openings located on each side of a chamber and with the size and length of the openings together with the chamber providing attenuation of impulse noise. The insert member also includes the base portion integrally molded to have a third opening larger than the first and second openings in the rod portion and with the first, second and third openings together forming a passageway through the insert member to the channel extending through the elongated member.

A balanced filter suitable for a reduction of the filter size. The balanced filter comprises strip-line resonators (SL1a, SL1b) constituting resonance electrodes on the unbalanced side, strip-line resonators (SL2a, SL2b) disposed in adjacently opposed relation to the strip-lines on the unbalanced side and constituting resonance electrodes on the balanced side, strip-line resonators (SL3a, SL3b) disposed in adjacently opposed relation to the strip-lines on the balanced side and constituting stage constituting resonance electrodes, and impedance elements (Z) coupling the resonance electrodes on the balanced side to the stage constituting resonance electrodes.

A band elimination filter includes an input terminal and an output terminal. A capacitor is coupled between a first terminal connected to the input terminal and a second terminal connected to the output terminal. The first terminal is grounded only via a first grounding point. The second terminal is grounded only via a second grounding point. A first acoustic resonator is connected between the first terminal and the first grounding point and a second acoustic resonator is connected between the second terminal and the second grounding point.

A signal processing apparatus includes an input circuit to receive an input signal, and a high-pass filter responsive to the input circuit. The high-pass filter includes M taps to filter precursor intersymbol interference (ISI), one main tap and N taps to filter postcursor ISI. Each of n taps of the N taps is limited to a range of between −1 and 0. The signal processing apparatus includes a decision feedback equalizer. The decision feedback equalizer includes a decision circuit responsive to the high-pass filter, and a feedback filter responsive to the decision circuit. The decision circuit is responsive to the feedback filter.

The invention discloses a main winch rapid-descent and confluent return oil regeneration system of a rotary drilling rig, which includes a main winch motor, a brake, a main valve and a pilot handle, wherein the pilot handle is communicated with the main valve through an oil path, and a special balance valve block for return oil regeneration is connected between the main winch motor and the main valve through pipelines and is controlled and adjusted by a control device. The invention improves the efficiency, accelerates the descent of the main winch, shortens the pore-forming subsidiary operation time, and improves the pore-forming efficiency. The main winch utilizes the own gravity to do work in the descent process, so that an engine is not required to run with full power but run at an idle speed, thereby saving the fuel oil and reducing the CO2 emission from a main unit; braking and speed adjusting control signals come from the pilot handle, so that the system controllability is better in comparison with the original form that motor +BVD balance valve control signals come from the inside of a BVD balance valve, the problem that the winch slides downwards in a stalled state is basically solved, and the damage to a drilling stem and a drilling rig caused by the fall-off of the drilling stem can be effectively prevented.

An extended underwater electromagnetic transducer is provided with an electrically insulated transmission line typically connected to a transmitter or receiver or transceiver system. The transmission line allows near-field communications with another transmitter or receiver or transceiver system. The transmission line provided is relatively long, the through water signal path length can be significantly reduced.

A duplexer includes an antenna terminal, a first filter connected to the antenna terminal, and a second filter connected to the antenna terminal. At least one of the first filter and the second filter is a ladder type filter in which a parallel resonator and multiple series resonators are included, one or more first inductors are respectively connected in parallel with one or more series resonators out of the multiple series resonators, and one of the one or more first inductors is connected in parallel with one of the multiple series resonators that is arranged closest to the antenna terminal.

Aspects provide methods for controlling user equipment operation in a wireless communications network configured to support communication with the user equipment according to a communication mode which utilises repetition of messaging; computer program products and network nodes operable to perform those methods. One method comprises: determining a modulation and coding regime to be used by the user equipment; identifying a repetition regime to be implemented by the user equipment in conjunction with the modulation and coding regime; and communicating an indication of the determined modulation and coding regime and identified repetition regime to the user equipment. Aspects recognise that when implementing a coverage enhanced region within a network it is possible that fixed repetition levels can be defined for CE-MTC UE. Those fixed repetition levels can be implemented by a network and recognise differences between the CE-MTC UE radio condition. That is to say, the number of repetitions used may correspond to radio condition being experienced at a machine-type communication device: those in poorer coverage regions will be selected to receive a greater number of repetitions than those in a better radio coverage region. The granularity of such repetition levels may subject to a given operator's implementation of a coverage enhanced region. The first aspect recognises that it is possible to implement varying repetition levels for user equipment operating in the coverage enhanced region supported by a network access node. Those varying repetition levels can be configured at the network access node; for example, an eNodeB.

An electromagnetic interference (EMI) filter or frequency filters (e.g. bandpass or band reject filters) in which a capacitor has an inductance cancellation loop. Inductive coupling between capacitors can allow undesired high frequencies to propagate across a filter. This is particularly a concern when the capacitors are oriented in parallel. In the present invention, the inductance cancellation loop is disposed adjacent to one capacitor so that mutual inductance between the capacitors is reduced. The attenuation of the filter at high frequencies is thereby increased. The loop can increase voltage attenuation of an EMI filter by about 20 dB. In another aspect, inductors in the filter are oriented horizontally relative to a circuitboard. Horizontal orientation reduces leakage inductance coupling between the inductors and circuitboard traces, and between the inductor and capacitors, thereby preventing unwanted propagation of high frequencies. Both measures in combination can provide a voltage attenuation increase of 30 dB.

A method to prepare recombinant influenza viruses comprising a mutant M2 protein which has a deletion of two or more residues in the cytoplasmic tail and is attenuated in vivo, is provided, as well the resulting virus and vaccines with the virus.