low frequency

In the paper, three field circuit ground protections with low frequency voltage injection which have been used are introduced.

The properties of high frequency hydraulic shaking table are high speed, easy to install and having huge force in low frequency.

On the contrary, the SCS summer monsoon tends to be weak when the inactive state is dominant for the low frequency oscillation.

This work is of great significance to understand the outer orientation technology with low-frequency electromagnetic waves.

A sound with a high frequency is said to be high-pitched and a sound with a low frequency is low-pitched.

Quite a few of the low-frequency oscillations reported at home and abroad are due to large disturbances.

however , evidence is accumulating that exposure to extremely low frequency electromagnetic field may produce a lot of biological effects.

Finally, watermark is embedded in the low frequency coefficients of every sub-block.

The company is specialized in producing high-, low-frequency transformers, coils and inductors Rectifier-owned enterprises.

Experiment shows that the system has a good effect for compensating the low frequency disturbance of the environmental magnetic field.

Phase dependent latency effects are believed to be a result of the phase-sensitive low-frequency neurons.

These antennae are small enough to be mobile, but they are not quite big enough to catch all of the low-frequency radio waves.

Compared with the injected S signal technique, this method is called low frequency AC signal injection method.

Harmonic wavelet analysis was applied to the non-linear vibration signal analysis in the low frequency segment of a cracked rotor.

Birds, for example, are said to be able to hear low frequency sounds bouncing off mountains hundreds of kilometres away.

Dimensionality reduction techniques applied to the item space tend to have the same effect by eliminating low-frequency items.

The forced resonance mechanism is one of many reasons of power system low frequency oscillation.

This paper gives the result of an experimental study and analyses about pump jet low frequency line spectra.

All he does is put mice on a platform that buzzes at such a low frequency that some people cannot even feel it.

The main low frequency noise source is AC noise. Filtering the AC noise by means of analog will introduce much signal delay.

he discovered that the whistle with a pea in it issued to all Fench gendarmes produced a whole range of low-frequency sounds.

The second part, our purpose is to design very low frequency filters and oscillators which can be applied to the design of biomedical chip.

and point out that it may fail when applied to system where multiple weakly damped low frequency oscillation modes coexist.

See the waves of light propagating across the page from high to low frequency. The light appears polarized and includes all wavelengths.

A low frequency full bridge converter, cascaded behind the proposed circuit, can be used to operate HID lamps and makes the lamp work well.

since the dwt coefficients have the property of energy conservation in the low frequency part , it is suitable for data compression.

The particles-impact damper can be applied to the vibration control of nonlinear systems with low frequency and dense modes.

This amplifier can be applied to the low frequency intelligent instruments and industrial control system.

In many power electronic applications ferrite cores of magnetic components are biased with a DC or low-frequency premagnetization.

The amplitude of the signal was modulated in our system and the low frequency background noise isolated by an electrical filter.

The invention relates to a laser spot collector with low frequency and narrow pulse for a laser transmitter.

An apparatus for use in low frequency vibration energy harvesting (VEH) and with actuators requiring a low deflection force.

This paper introduces the structure and principle of a novel low-frequency electronic pulse therapeutic apparatus.

The direction of the low frequency current with maximum frequency was also WSW.

In sound recording, a low frequency noise usually produced by regular variations in the speed of a system's mechanical component.

Waveform distortion of super low frequency standard shaker is an important factor which influences the calibration precision.

Among the signals we have got, including those of Ertan Hydropower Station, it is hard to explain the exceptional signal at low frequency.

Of particular interest are waves that simulate low-frequency motions and that help to establish and maintain the equatorial current system.

Measuring ferromagnetic component volt-ampere characteristic in low frequency condition can offset deficiency of power-frequency experiment.

How to adopt reasonable vibration mitigation measures to minimize the impact of low frequency vibrations is an urgent problem to be solved.

Used in this paper is to design a general low-frequency differential transformer signal generator.

A low-frequency sine wave current source is widely used in fields of grounding grid fault diagnosis, communication, radar, etc.

Integrating twice with a second-order modulator, instead of just once, is a great way to minimize low-frequency quantization noise.

Hardware resources are often allocated based on a worst-case scenario that may happen with a low frequency.

Helmholtz resonator has a good noise eliminating performance at low frequency. So it has been widely used on low frequency noise reduction.

It was found that the low-frequency noise is much different even with little change in the device structures.

The gradient generation coil assembly is stiffened to suppress low frequency vibration of the gradient generation coil assembly.

Low frequency oscillation is an important problem which always affects the security and stabilization of power system.

abstract: Objective: To investigate the curative effectiveness of low-frequency electrical stimulation for dysphagia after stoke.

Linear Technology announces the LTC6991, a simple, accurate low frequency clock specifically designed for long duration timing applications.

The prediction result was finally acquired by synthesizing the forecast values of the low frequency signal and high frequency signal.

Simulation results show that the SSSC damping controller can damp inter-area mode low frequency oscillation in power system effectively.

The experimental results show that the increasing of low-frequency noise and the voltage peak - peak random is the main failure mode.

Long-wavelength static correction is a low-frequency correction due to the amount of construction.

For low frequency and logic measurement, any ground connection from scope ground to circuit ground is OK, the probe ground may be left open.

Today's microchips operate by means of low-frequency radio waves that target them.

An equivalent simplification method was proposed for analyzing low frequency oscillation in identical multi-machine power systems.

It is called delta sleep because of the presence of high amplitude, low frequency delta waves that are seen to occur in the EEG.

There's a systemic gap, Varian points out, between the low-frequency data employed by governments and the high-frequency data of business.

The KM-4 is a dynamic kick drum microphone with a neodymium capsule designed to provide a deep and powerful low frequency response.

This article reviews the progress in research on the application of low-frequency ultrasound-enhanced thrombolysis in cerebral infarction.

inversion cavities can improve the low frequency sound insulation character of present sound-isolating and decoupled tiles apparently.

The volume may include a region obliquely oriented relative to the diaphragm to support a low frequency response of the speaker.

Low frequency trading data is far from enough for this kind of researches.

Low frequency noise is one of the most important factors in infrared detectors for space remote sensing applications.

Elephants can produce low-frequency vocalizations called "rumbles, " which are barely audible to the human ear.

The units incorporate a low frequency amplifier module capable of delivering 300 watts rms to the internal components.

Secondly, compared with low - frequency behavior, in high - frequency behavior, children do better in trait identification.

The mask acts as a low frequency spatial filter whose effect is to enhance rendition of fine detail.

The main experimental problems are also analyzed with such ultra-low-frequency measurements.

In load cell applications, this stop-band rejection is useful to reject low frequency mechanical vibrations of the load cell.

The low-frequency noise of propeller has constituted the main part of radiated noise of middle or high-speed marine.

And the researchers found an excess of low frequency CNV deletions - where part of the genome is missing - in shorter people.

These natural geomagnetic waves are being replaced by artificially created very low frequency (VLF) ground waves coming from GWEN Towers.

Resonator transducer using fluid vibration inner chamber is a typical low-frequency and deep-submergence transmitter.

The characteristics of the dispersive relation and the propagation of plasma low frequency noise are discussed in details.

Nano spinel ferrite has excellent low-frequency electromagnetic absorption properties.

The design method of an active SAW filter module with low frequency and high stopband rejection is introduced in this paper.

Methods The patients were scanned by high-low frequency probe with compression. All cases were confirmed by operation and pathematology.

GUARDIAN overcomes the challenges of low frequency self-noise providing greater productivity and improved data quality.

Compared to Fourier algorithm, this algorithm can accurately calculate the magnitude of low-frequency fault components.

is a bass reflex subwoofer designed to compliment the full range models in the Programme series providing low frequency reinforcement.

The radiation efficiency of the radiation modes falls off very rapidly with increasing modes order at low frequency.

BBN has developed the ARTS array vehicle concept specifically to address the formidable problems of low-frequency active sonar sources.

It reveals the probability and conditions of extra-low frequency oscillation and double frequency oscillation in power systems.

Secondly, core technology of double-fed induction generator is excitation control technique of low frequency Inverter.

The main experimental problems are analyzed with the ultra-low-frequency measurements.

Study on low-frequency inverter technology possess important scientific significance.

The MX-118B's bandpass enclosure design provides for uniform low frequency reproduction without the need for a crossover.

The conventional method has the disadvantage of suppressing effective low-frequency signals as well as surface wave.

Low frequency URLs are vulnerable to piggyback attack as well as popular and focused overload attacks.

We model preheating the reservoir with low frequency current using two horizontal electrodes, before injecting steam.

ADSL splitters take a role of separating low-frequency audio signals from high-frequency signals.

Wave frequency components are larger than low frequency components in line tension response and vessel surge motion response.

For fast metal removal (roughing cuts), high amperage, low frequency, high capacitance, and minimum gap voltage are required.

The traditional methods to measure the relationships among return, volatility and trading volume are base on the low-frequency data.

As far as the vibrancy frequency of offshore platform is concerned, offshore platform is regarded as a low frequency structure.

Entire performance turns worse when Erhu skins got defective; especially the ratio of low frequency sound is too high. It sounds muffled.

ECG signal is a weak low frequency non-stationary signal, and possessing random character and noisy setting strong character.

Applicable to connection of speakers in various sound engineering projects. It transmits low frequency and sound signal.

The low frequency ion noise has negative influence on detectability in radar application and data rates in communication system.

Then, it can be used to eliminate low frequency oscillation between interarea of a power system.

The main reason of inclined pipe fracture was low frequency stress fatigue failure at temperature field.

The invention discloses a low-frequency magnetic therapy apparatus and a method for using the same.

Then, by using chaos theory, chaotic forecasting models are established to forecast the low frequency and high frequency parts respectively.

The team has already shown that low-frequency magnetic pulses can inhibit false memories, also by temporarily inhibiting the left ATL.

Highly accurate detection of feeble and low frequency signals become realizable with the PWM sensing technique.

The cable of cable-driven manipulators undergoes global motion combination with local low-frequency vibration.

In this paper, the effects of the rigid body motions and low frequency surface errors on the image quality were analyzed.

And the cathode heat appearance to also flap to concuss to have influence to the low frequency.

Before scalar quantization to the low frequency sub-band of wavelet image, normalization was performed firstly.

The researching development on the characteristics of low frequency loudspeakers is expounded.

Dynamic characteristics of the portal frame are also identified from the WPT of low frequency signals.

The diaphragm mass is determined with the compliance of the suspension in mind so that the desired low frequency resonance is achieved.

This paper introduces anew type of fire pump inspection: low-frequency automatic inspection test water technology.

This allows the ear nerve to be tempered, low-frequency noise damage, there is a certain subduction.

Packaging - Complete, filled transport packages and unit loads - Vibration tests at fixed low frequency.

To predict the major sources of low-frequency noise and reduce it are recent difficulties in researching the vehicle interior noise.

Dominant frequency of each measuring point Belongs to low-frequency.

Although the passive UHF tags than low frequency labels are more susceptible to RF interference.

cause high frequency noise but downstream of the exhaust jet the larger eddies create low frequency noise.

The low-frequency and low-voltage load reduction control strategy of power system stability control system is analyzed.

The low frequency model is assigned to the local surface region as its average reflectance for radiosity calculation.

Celestial gravitational wave source and the exploration to low frequency gravitational wave have also been discussed.

Applying the new techniques to the resonators of low frequency filters, satisfied results are being obtained.

The chorus effect modulates the original sound by a sinusoid low frequency oscillator (LFO).

The circuit employs chopper technique which can effectively reduce the low frequency noise and amplify the weak signals.

This design adopted a filter of a RC to come to in addition to these direct currents and low frequency weight.

We have studied rapidly measuring soil moisture content with low frequency electromagnetic wave.

The C-10 is equipped with an underslung low-frequency laser to pinpoint targets of such strikes.

Low frequency high power ultrasound is a recent addition to the list of methods for arterial angioplasty.

Moreover, some unknown low-frequency oscillation phenomena often happen in the process of the power system operation.

The results in this thesis provide a new method to solve problems of interaction effects and low frequency oscillation in power system.

The necessary information on the low frequency range can be obtained by wavelet analysis on the monitoring data.

All the induced dc and low-frequency errors have been lumped together as EOS .

The results show that inner hair cells is sensitive to low frequency, which produces to the environment adaption.

In this paper, the low-frequency oscillation model is proposed considering hydro-turbines and speed governors.

The low frequency continuous noise is achieved by calculating random continuous forces of propeller.

Importation of low-frequency, high-frequency, ultrasonic and ultra-short wave equipment is governed by the regulation of "602" .

Aerodynamic noise is the main noise and shows low-frequency characteristics.

To research the value of ultrasonography high-frequency and low-frequency probe combined to diagnose acute appendicitis.

So the combination with the volume of stage coupling controls the amplitude modulation of low frequency.

There is inadequate evidence in experimental animals for the carcinogenicity of extremely low-frequency magnetic fields.

With expansion of interconnected power grids, low frequency oscillation can hardly be avoided.

It decomposes the original image to area of low frequency and high frequency and then transforms it with different fusion rules.

Secondly encodes the magnitude of nonzero wavelet coefficients at low frequency subband in bit plane order.

Rail systems in Germany, Austria, Switzerland, Sweden and Norway all use electrical power at low frequency.

RF (or microwave) signals have switching considerations that differ from those for DC or low frequency AC signals.

The overlap of cloud layer and shadow was repaired to remove by the method of high and low frequency compensating.

The giant magnetostrictive actuator has the features of big output strain force, rapid responsibility and low frequency.

Finally curve fitting was executed on the global motion vector that has been filtered with Kalman filter to remove the low frequency noise.

Frictional heating generated by low-frequency ultrasound makes cracks in solids visible to IR cameras.

the peak of vibration response of vulnerable parts can decreased at low frequency ratio by increasing mass ratio.

blanket on the health hazards from extremely low frequency electromagnetic fields.

By using this apparatus, the calibration of low frequency vibrating sensor is solved in theoretical and practical aspect.

Working parameters of low-frequency radiation similar with negative gradient zone.

The watermark was embedded in the low-frequency coefficients by quantization modulation.

The interior low frequency noise of passenger car has direct influence on its comfort.

In recent experiments, Low-Frequency Active (LFA) system has detected submarines at long ranges.

A very low frequency of transmittance to visceral tissue was confirmed in pigs, but not in sheep.

A DWT Blind digital watermarking embedding and detection method by trembling 3rd-order DWT coefficient of low frequency energy is presented.

Model ST Damping Spring Vibration has two advantage, low frequency as steel spring one and large damp as rubber one.

Two modes in a hybrid thermoacoustic engine, high frequency mode and low frequency mode, have been reported in Ref. 1.

The low frequency radiation of common mode current is greater than a same length square differential mode.

The car pare low frequency vibration; High frequency vibration; Cancellation measure.

According to the resonance mechanism, power disturbance of prime mover can arouse power system forced low frequency oscillations.

The performance of Low Frequency and Clearness are better when giving the Erhu skin soaking treatment.

The low frequency loudspeakers and other acoustic elements are not shown in FIG. 6.

And it's difficulty to be effectively enhanced according to the traditional sound insulation mass law in the low frequency part.

Adding the airspace can improve the sound absorption properties under low frequency.

The installation consists of several low-frequency speakers, each of which is paired with a laser transmitter.

This lot covers an advanced communication system that can transmit or receive audio data by modulating low frequency magnetostatic signals.

The stabilizing effect of hot-electron and line-tying on the low-frequency plasma interchange mode is analysed.

This circuit is restricted to low frequency operation by the lamp time constant.

From this spectrum, one or more low-frequency signal components that are characteristic of the sample being interrogated are identified.

Secondly, all wavelet coefficients of low frequency subband are retained.

The high frequency signals and the low frequency are forecasted with least square support vector machines.

Active control technology has great advantage in the elimination of low-frequency noise.

The performance in low frequency can be improved by. . .

This content is updated with low frequency and is shared for many users, and so content in the News area is categorized as static content.

RESULTS: The low frequency electro-magnetic field could make the patients positive slow potential elevated.

Power system of the "three lines of defense" concept put forward, more enhanced low-frequency-low-voltage load shedding equipment status.

The low-frequency vibration grinding system has the features of easy realization, low cost and brief operation.

Note: Fast gating of sustained low frequency signals can result in "chattering. "

But hearing tests revealed that they struggled with high and low frequency sounds.

The denoised image is obtained through inverse wavelet transform by the low frequency image and the high frequency images.

Seismic response are characterized by high amplitude and low frequency.

The image details are not influenced, because the frequency of the low frequency signal filtered is more less than the frame frequency.

Application of low- frequency pulse oil recovery technique .

In this paper, we analysis the low-frequency phenomena from the viewpoint of damping torques.

The ocean has properties that allow low-frequency sound to basically move globally.

Unlike low frequency data, high frequency data has the calendar effects and long memory volatility.

The paper concerns low-frequency summer monsoon in the Southern Hemisphere.

Especially for the low frequency, it is two orders of magnitude more than the frequency domain analysis.

As a less variable and more accurate estimator, the TSRV method has robustness in the choice of low frequency sampling rate in practice.

Centralized computer which low-frequency-low-voltage load shedding equipment more rapid development momentum, the market is very good.

the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz).

The inverter runs at low frequency when driving fan can play a very good effect at saving energy.

QS28 large size of the subwoofer with the horn is a high level when the replay surplus designed low-frequency energy.

Some products on the market do have problem with distortions in the low-frequency range.

Conventional CDMA's system always have low frequency utilization ratio which is thanks to multi-access interference.

It is necessary for the Aviation Static Inverter with high frequency link to replace the Aviation Static Inverter with low frequency link.

Objective To observe the effect of low frequency ultrasound therapy on lumbago from soft tissues injury.

For the operational risk with low frequency but high danger, we use POTmethod of Extreme Value Theory.

Low-frequency traces and long-offset traces are typical targets for muting.

Then, for low frequency sub-image, average coefficient is adopted.

Extremely low-frequency magnetic fields are possibly carcinogenic to humans (Group 2B).

The accumulator play an important role in low frequency domain but not effective in high frequency domain. T. . .

Low-frequency harmonics are reduced using line reactors.

For low frequency fusion, it is used to combine with bases on domain pixel correlation and regional variance.

However, it is necessary to depreciate to low frequency customers in the mid of program time horizon.

Purpose: Used in circuit of DC or low frequency AC.

It also shows that the method based on SYSNOISE can predicate the low-frequency scattering characters of underwater targets effectively.

Results reveal that there are significant low frequency oscillations with 30-60 day period over the SCS region.

In some cases trialled, the low frequency content of music signals became excessively boosted.

This low frequency rate in your plane of existence corresponds to the vibration of fear.

Step motor speed is seen in low frequency vibration phenomenon.

The main research content is how to improve the performance of the low frequency feed.

A low frequency amplifier module delivering 300 watts rms to the internal components.

Male elephants find fertile females by using these low frequency sounds.

group C received low-frequency electrical stimulation and biofeedback in addition.

It is designed to detect the low-frequency radio pulses emitted by lightning strikes.

The abnormal colours of seedlings turned a low frequency .

A new type of low-frequency vibration-tapping machine is introduced.

It is observed that a resonant interaction takes place at low frequency when the shells are very close to each other.

The DLX-218B is a straight forward, no nonsense 18-inch bass double reflex subwoofer with exceptional low frequency response.

SUBWOOFER: Only sounds in the low-frequency range are output.

Study on subjective annoyance and control method of indoor low-level and low-frequency noise and it's control.

Putting forward a method of low-frequency current extraction on the base of damped complex wavelet. 5.

From the past study, these messages generally are low frequency and pure tone vibration.

The common bore plank will cause to keep on of the Votex flow, creation low frequency.

SUB-18 subwoofer is a high frequency speaker system, ideal for two ultra-low frequency-matching device.

The SVP-X18B is a straight forward, no nonsense 18-inch bass reflex subwoofer with exceptional low frequency response.

The SI-18BX is a straight forward, no nonsense 18-inch bass reflex subwoofer with exceptional low frequency response.

The low frequency 2DPSK inductive communication system is a kind of wireless digital communication system.

Thus research has been going on for some time in the area of low frequency active (LFA) towed array sonar.

So blue whales and fin whales produce very low-frequency sounds that can travel over very long ranges.

In this paper, the current-injected EIT at low frequency has been studied in the following aspects.

LFA is based on the fact that very low frequency sound [100-1000 Hz] can travel great distances and detect quiet submarines.

In addition, learning by rote, the low frequency of input and grammar-translation teaching method also lead to lexical errors.

the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves.

Application of low frequency signal to imaging anhydrite based on modeling.

When bigger grid is used, the FEM curve overlaps theoretical curve in low frequency, errors occur in high frequency.

But for materials where you have vibrations, acoustic vibrations, those are low frequency.

Some CNVs are common, but others are rare or occur with low frequency among humans.

The filter can remove high-frequency jitter effectively and keeping low-frequency movement at the same time.

Helps eliminate stage rumble or other low-frequency room noise such as that coming from heating, ventilation, or cooling( HVAC) systems.

In addition, the low-frequency noise caused by crosscorrelation imaging conditions also puzzles the practicality of reverse time migration.

Physiological signals cant be transmitted through telephone networks because they are full of ultra low frequency components.

Watson was in fact listening to very low-frequency radio emissions caused by nature.