145 results about "Extremely low frequency" patented technology

The present invention describes the use of a space-based Extremely Low Frequency (ELF) magnetic field detector in conjunction with ground-based network of ELF magnetic field detectors. In particular, a space based ELF detection system can be used to perform a wide area search and find precursor earthquake signals in both known and unknown earthquake zones, and a ground-based network of ELF detectors can be used to verify that the signals are indeed earthquake generated signals. The use of this invention will minimize cost and manpower necessary to effectuate an accurate and reliable earthquake detection system.

This is a new invention, including improvements upon existing inventions, which is safer, simpler to use, less invasive into a user's daily routine and provides a lower cost solution to existing pulsed magnetic field and related vibrational electromagnetic therapy devices. This invention (apparatus) is referred to as an EnergyWave Therapy Device to distinguish it from existing electromagnetic therapy devices. It operates non-invasively on a homeopathic level to improve sleep, encourage natural healing and reduce pain, swelling, and general discomfort. This is accomplished through different embodiments of the apparatus all of which generate Multiple Simultaneous Extremely Low Frequency (MSELF) energy waves which may be any combination of Alternating Polarity Magnetic Fields (APMF), narrowband near-coherent long-wavelength (580 nm to 980 nm) light emitting diodes (LEDs), or electrical vibrations transmitted through the medium of water using carbon rod electrodes. The MSELF vibrations are derived from a quartz crystal with a fundamental frequency less than one-half of one percent from a natural Fibonacci Sequence Number. The apparatus utilizes firmware operating in a microcontroller containing predefined, user selectable therapy programs either emulating natural Circadian Rhythms for sleep and rest, or other therapeutic programs, all of which contain Electromagnetic Field (EMF) dose limitations to prevent any possible overexposure. The microcontroller is also clocked at the same fundamental frequency generated by the Fibonacci Sequence Quartz Crystal. Additionally, the apparatus's unique application of an H-Bridge configuration power-driver with Pulse Width Modulation (PWM) capabilities supports a novel approach to supply two simultaneous therapeutic frequencies to either a copper-trace coil emitter integrated on the main Printed Circuit Board (PCB) or optional external energy emitters. The result is a more effective, lower energy, safer, lower cost, simpler to use, noninvasive, multi-modal, EnergyWave Therapy Device.

The invention discloses a self-adapting random resonance weak signal detection method, which achieves the self-adapting detection of weak periodic signal through combining a matching random resonance and an imposed signal induced random resonance. According to the theory of random resonance, firstly, numerical simulation is processed to receive correspondence between the noise intensity and the frequency of the best matching random resonance of a nonlinear bistable system in a range of extremely low frequency and under the condition of small-signal; and a high-frequency weak signal encountered in a project can be processed by using the change of normalized scale. For the detection of a weak signal with extremely low message-to-noise ratio and large noise intensity, the heights of voltage barriers of the bistable system can be changed by using the induced random resonance, thereby helping a weak eigenfrequency signal to fulfill the transition between voltage barriers, so that the bistable system reaches the random resonance state, thereby achieving the self-adapting detection of the weak periodic signal.

The invention discloses a track detecting system and method based on integrated navigation. The track detecting system and method accurately and rapidly detect a railway track. A wireless navigation base station is established in a GNSS signal shielding zone; an integrated navigation device receiving GNSS and / or wireless navigation signals is integrated into track detecting equipment; position drifting and posture drifting of a gyro sensor are eliminated through GNSS and / or wireless navigation, positioning and track plotting, and therefore the divergence problem of track detecting accuracy is solved; and a self-adaption smoothing compiling high-pass filter is adopted for eliminating influences such as changes of the slowly-changing track elevation with an extremely low frequency and a large value, changes of the filter-out gradient and superelevation on a curve of the gyro sensor; and the system integrates a displacement sensor, an inclination sensor, the gyro sensor and the like of the track detecting equipment, a mileage counter and the added integrated navigation device, a data fusion technology is adopted, track internal geometric parameters, coordinates, elevations and 150-300 m base length irregularity are independently detected, and the detecting speed is higher than 4 km / h, so that the bottleneck problems of track detecting in operation maintenance of high-speed and common-speed railways are solved.

The present invention is an extremely low frequency (ELF) microphone and acoustic measurement system capable of infrasound detection in a portable and easily deployable form factor. In one embodiment of the invention, an extremely low frequency electret microphone comprises a membrane, a backplate, and a backchamber. The backchamber is sealed to allow substantially no air exchange between the backchamber and outside the microphone. Compliance of the membrane may be less than ambient air compliance. The backplate may define a plurality of holes and a slot may be defined between an outer diameter of the backplate and an inner wall of the microphone. The locations and sizes of the holes, the size of the slot, and the volume of the backchamber may be selected such that membrane motion is substantially critically damped.

The present invention is an extremely low frequency (ELF) microphone and acoustic measurement system capable of infrasound detection in a portable and easily deployable form factor. In one embodiment of the invention, an extremely low frequency electret microphone comprises a membrane, a backplate, and a backchamber. The backchamber is sealed to allow substantially no air exchange between the backchamber and outside the microphone. Compliance of the membrane may be less than ambient air compliance. The backplate may define a plurality of holes and a slot may be defined between an outer diameter of the backplate and an inner wall of the microphone. The locations and sizes of the holes, the size of the slot, and the volume of the backchamber may be selected such that membrane motion is substantially critically damped.

The invention relates to an image visual characteristic extraction method based on sparse coding and belongs to the technical field of digital image processing of computers. The method comprises the following steps of: extracting low-level characteristics of a picture set; removing labels with extremely low frequency, and generating a label vector; generating a matrix W similar to the low-level characteristic to serve as a basis of manifold constraint, and essentially combining low-level visual characteristics and high-level textual characteristics; establishing a target function; and minimizing the target function, so as to obtain an optimal matrix consisting of sparse coding of the low-level characteristics of the picture set. According to the method, by the adoption of the sparse coding, hidden type information of the low-level visual characteristics and the high-level textual characteristics of an image is well mined, and a model has high robustness; according to the method, a maximization pool method is adopted, and a unique image visual characteristic vector of each picture is obtained; and moreover, the visual characteristics of a final image are simple and effective.

This is a new invention, which is safer, simpler to use, less invasive into a user's daily routine and provides a lower cost solution to existing pulsed magnetic field and related vibrational electromagnetic therapy devices to improve sleep, encourage natural healing and reduce pain. This is accomplished through Multiple Simultaneous Extremely Low Frequency (MSELF) energy waves. The MSELF energy waves are derived from a quartz crystal with a fundamental frequency less than one-half of one percent from a natural Fibonacci Sequence Number. The apparatus utilizes firmware operating in a microcontroller. emulating Circadian Rhythms. The microcontroller is also clocked by the Fibonacci Number Quartz Crystal. Additionally, the apparatus's unique application of an H-Bridge configuration power-driver with Pulse Width Modulation (PWM) capabilities supports a novel approach to supply two simultaneous therapeutic frequencies.

A purpose of the present invention is to provide a vibration damper which, in a specific temperature range around room temperature (-20 C to 20 C), shows extremely high vibration-damping (energy-attenuating) properties with respect to vibrations having a frequency not lower than low frequencies (several hertz), which can have vibration-damping performance that has been controlled at will so that the damper effectively functions not only in a low-temperature high-frequency range but also in an extremely-low-frequency specific range and in a specific temperature range, and which has a high degree of freedom of material design. The vibration damper is accomplished with a composition for vibration-damping materials which comprises a branched polymer (A) and a resin (B), the amount of the branched polymer (A) being 15-85 wt.% with respect to the total amount of the branched polymer (A) and the resin (B).

An antenna comprises a medium substrate and grounding units attached on the medium substrate. The antenna further comprises a metal structure attached on the medium substrate. The metal structure comprises an electromagnetic response unit, a metal open ring enclosing the electromagnetic response unit and a feeding point connected to an end of the metal open ring. The electromagnetic response unit comprises an electric-field coupling structure. This design increases the physical length of the antenna equivalently, so an RF antenna operating at an extremely low frequency can be designed within a very small space. This can eliminate the physical limitation imposed by the spatial area when the conventional antenna operates at a low frequency, and satisfy the requirements of miniaturization, a low operating frequency and broadband multi-mode services for the mobile phone antenna. Meanwhile, a solution of a lower cost is provided for design of the antenna of wireless communication apparatuses.

The invention discloses a device and method for producing nuisanceless bean sprouts by adopting an extremely-low-frequency pulsed electric field. The device comprises an extremely-low-frequency high-voltage pulse generator, wherein two poles of the extremely-low-frequency high-voltage pulse generator are respectively connected with a copper plate; the two parallel copper plates are used as electrodes; and a nonmetal bracket for holding seeds is arranged between the two copper plates. The method comprises the following steps of: cleaning and sterilizing bean seeds or peanut seeds to be planted, killing surface microorganisms, soaking for 3-24 hours in water, putting water-absorbed and germinating seeds in the extremely-low-frequency pulsed electric field for treatment; and culturing the treated seeds under the normal temperature till to be harvested, and obtaining the nuisanceless bean sprouts. The device and method disclosed by the invention have the advantages that the obtained seeds treated and cultured in the pulsed electric field germinate quickly, the fresh weight, the sprout length and the like of seedlings are greatly different from those of the seedlings which are not treated by the pulsed electric field, and the quality and the yield are greatly increased.

The invention discloses an extremely low frequency and magnetotelluric joint measurement method, and belongs to the technical field of deep resource detection. The extremely low frequency and magnetotelluric joint measurement method is specifically used for precise detection of deep geological formation and construction, and can be especially used for the detection of high-resolution electrical fine structures in deep 10km of oil and gas fields. The extremely low frequency and magnetotelluric joint measurement method is as follows: an electromagnetic wave is obtained by using a signal emissionsource of a WEM method, that is, variable frequency current is injected into the underground through a large emission power source, the generated electromagnetic wave is propagated upward to form a sky wave, the sky wave is propagated to an ionized layer, then is reflected by the ionized layer to an underground ore body and finally is propagated by an underground medium to the ground; and an array type WEM electromagnetic signal and an MT natural field electromagnetic signal are received in an oil and gas field, and a high-resolution electrical fine structure in the deep oil and gas field isobtained by joint measurement and data processing inversion interpretation of the WEM electromagnetic signal and the MT natural field electromagnetic signal. By adoption of the extremely low frequencyand magnetotelluric joint measurement method disclosed by the invention, the prediction precision of residual basin distribution in the ultra-deep mesoproterozoic erathem and neoproterozoic erathem can be improved, and a scientific basis is provided for the assessment of oil and gas resources within the depth range.

The invention provides a method of using extremely low frequency marine electromagnetic method to conduct marine oil and gas resources exploration. The method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration includes building an extremely low frequency launcher and a transmitting antenna, arranging a seafloor data collection station in a decided detected sea area, receiving signals of extremely low frequency electromagnetic signals after being reflected by seafloor mediums by using a seafloor electromagnetic signal collection station, figuring apparent resistivity and phases of the seafloor mediums according to the received electromagnetic signals, and getting construction conditions of seafloor oil and gas resources through inversion and geological interpretation. Compared with the marine magnetotelluric method, the method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration is high in measuring accuracy of electromagnetic signals and improves exploration accuracy. Compared with an existing marine artificial source electromagnetic method, the method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration saves a built-in emission source and reduces construction difficulties and saves construction cost. The method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration is an exploration method which combines advantages of the marine magnetotelluric method and advantages of the marine artificial source electromagnetic method.

A method for determining electrical properties of a submarine petroleum fluid-bearing formation (1) under overburden geological layers (2) of thickness (s) under a seafloor (3) of a sea (4),said method comprising the following steps:arranging one or more transmitter antennas (9) in said sea (4), andarranging one or more electromagnetic receivers (8) in said sea (4),said sea having a shallow sea depth (d) of 50-350 meters;using said transmitter antenna (9) transmitting electromagnetic signals (10) of one or more pulses (11) having frequency of very low frequency between 0.01 Hz and 0.10 Hz;using said receiver antennas (8) having an offset from said transmitter (9), for receiving propagated electromagnetic signals (12) due to said emitted; electromagnetic signals (10);analysing one or more components of said received signals (12) from receivers (8) having offsets between about 1 km and 12 km, whether said signals (12) differ significantly from a corresponding signal that would occur from a water-bearing formation (1), indicating a petroleum fluid-bearing formation (1).

The invention discloses a broadband magnetic sensor, belongs to an inductive magnetic sensor and solves the problem that the conventional magnetic sensor has extremely high noise in an extremely low frequency band. The broadband magnetic sensor comprises an induction coil, a high-frequency channel amplification circuit, a low-frequency channel amplification circuit, a low-pass filter, an operational amplifier, a voltage follower and a feedback circuit, wherein an output signal of the induction coil is respectively transmitted to the high-frequency channel amplification circuit and the low-frequency channel amplification circuit; the output end of the high-frequency channel amplification circuit is connected with a first switch; the output end of the low-frequency channel amplification circuit is connected with a second switch through the low-pass filter; central contacts of the first switch and the second switch are respectively connected with an inverse phase input end of the low-pass filter through a first input resistor and a second input resistor; and the output end of the operational amplifier is connected with the voltage follower and is connected with an induction signal input end of the induction coil through the feedback circuit. According to the broadband magnetic sensor, the low noise is amplified in the extremely low frequency band, the broadband magnetic sensor has flat amplitude-frequency characteristics and linear phase in wider frequency domains on two sides of the resonant frequency of the induction coil, and the application frequency range of the magnetic sensor is greatly widened.

The invention discloses a system using an extremely low frequency pulsed electric field to treat seeds, which comprises an extremely low frequency high voltage pulse generator, wherein a copper plate is respectively connected with two poles of the extremely low frequency high voltage pulse generator, the two copper plates are placed horizontally and serve as electrodes, and organic glass which is used for placing seeds is arranged between the two copper plates. A method which adopts the system to treat seeds includes the following steps: firstly, cleaning and sterilizing the seeds, killing surface microorganisms, and immersing the seeds in water for 3 to 24 hours; and then placing seeds which absorb water and germinate on the organic glass, and starting the extremely low frequency high voltage pulse generator to treat the seeds. According to the system using the extremely low frequency pulsed electric field to treat seeds and the treatment method, no pretreatment of seeds in any mode is required, only the extremely low frequency pulsed electric field is used for facilitating germination and growth of seeds, environmental pollution is avoided, nucleuses are not affected, chromosome variation of cells and environment hazards are avoided, the system and the method are simple and practical, and the effects are obvious.

A body shield (10) is disclosed for protecting a user from harmful thermal and electromagnetic radiation. The body shield includes a body portion (31) and a cover (32). The body portion has a multi-layered core (11) which is surrounded by an outer casing (12). The multi-layered core includes a first layer (14) of a magnetic metal alloy for shielding extremely low frequency electromagnetic radiation, a second layer (15) of a carbon based material for absorbing higher frequency electromagnetic radiation, and a third layer (16) of a non-magnetic material for conducting higher frequency electromagnetic radiation. The core may be incorporated into a body portion coupled to the device, a cover overlaying the device, or both.

The invention provides a novel frequency domain aviation extremely low frequency electromagnetic method. According to the method, an extremely low frequency electromagnetic signal which is transmitted by a ground high power launching pad is used. A launch vehicle takes a magnetic sensor to synchronously receive the magnetic signal of the launching pad above a target zone to identify a target. The method overcomes the disadvantages of shallow detection depth, heavy equipment, rigour construction demanding, high economic cost and the like of the existing frequency domain aviation electromagnetic method, takes into account the advantages of aviation extremely low frequency method and aviation natural electromagnetic field method, and has the advantages of deep detection depth, simple construction condition, portable equipment, high operability, low economic cost and the like.

The present invention belongs to the household daily necessary electronic product, in particular to an electronic pest-driving system driving the pests such as the rat and cockroach with a physic method. The electronic pest-driving device on the prior market has poor driving effect, which results in the certain adaptation of the pests such as the rat and the cockroach in the long-term application process. Based on the working principle of the prior electronic pest-driving device, the present invention proposes to adopt the single chip insertion-typed technology and the real-time clock chip and frequency-conversion technology to realize the digital electronic technology so as to produce the extremely-low-frequency electromagnetic wave, ultrasonic wave and the infrasonic wave having different frequencies and having no harm for the human body to drive the pests such as the rat and the cockroach. Through controlling the clock chip, the present invention produces the electromagnetic wave, the ultrasonic wave and the infrasonic wave in other frequent band after the system works for a period of time, thereby effectively resolving the problems of the prior electronic pest-driving device that the frequent point is limit and the effect is reduced due to the adaptation of the animal after the system is used for a period of time.

The invention discloses a nanosecond microwave narrow pulse modulator, and belongs to the field of microwave signal sources. The nanosecond microwave narrow pulse modulator comprises a time domain pulse generation module, a time domain pulse waveform modulation module, a microwave narrow pulse generation module and a microwave pulse waveform modulation module, wherein a modulation signal switch ratio of better than 80dB is ensured by using a microwave switch pre-modulation serial extremely low frequency mixing scheme; the nanosecond pulse width adjustment is achieved, the highest repetition frequency is 25 MHz, the modulation signal switch ratio is larger than 80dB, and the apparatus cost can be greatly reduced compared with purchasing a signal source specific pulse modulation option.

The invention discloses an acceleration sensor low frequency calibration platform and a usage method for the same. The acceleration sensor low frequency calibration platform comprises a disc type precision centrifuge, a linear guide rail and a sliding table; the linear guide rail is fixedly installed on a rotation plate of the disc type precision centrifuge through a guide rail support and overlaps with a diameter direction of the rotation plate of the disc type precision centrifuge; and the sliding table is installed on the linear guide rail and can perform reciprocating sliding along the linear guide rail. The invention provides a low frequency calibration device combining the centrifuge and the sliding table. A reference acceleration load is provided to the siding table through the centrifuge and a distance between the sliding table and the rotation center of the centrifuge is regulated through sliding of the sliding table so as to realize the fact that an acceleration load changes according to a sine rule. Finally, on the premise that the travel of the sliding table is not increased, the acceleration sensor low frequency calibration platform and the usage method for the same can achieve extremely low frequency and a large acceleration load and greatly improve signal-to-noise ratio of an output signal of a calibrated sensor.

A body shield (10) is disclosed for protecting a user from harmful thermal and electromagnetic radiation. The body shield includes a multi-layered core (11) which is surrounded by an outer casing (12). The multi-layered core includes a first layer (14) of a magnetic metal alloy for shielding extremely low frequency electromagnetic radiation, a second layer (15) of a carbon based material for absorbing higher frequency electromagnetic radiation, and a third layer (16) of a non-magnetic material for reflecting higher frequency electromagnetic radiation. The outer casing includes a thermal resistant top layer (18) and a thermal resistant bottom layer (19) sealed around its periphery to the top layer.

The invention discloses a navigation system for an underwater bathyscaph and a precise three-point positioning method. The navigation system comprises an extremely low frequency receiving and transmitting module, a GPS receiving and transmitting module, an electronic compass, a digital signal processing unit, an MEMS inertia measurement unit and a bathyscaph center computer. According to the invention, an MEMS gyroscope and an MEMS accelerometer are employed for forming a posture measurement unit, and form an inertial combination navigation positioning system with the electronic compass, and the inertial combination navigation positioning system cooperate with a control system. When the bathyscaph is located on a water surface, the bathyscaph is switched to a GPS mode, and obtains the position information through the GPS receiving and transmitting module; when the bathyscaph is located underwater, the GPS positioning data is invalid or DOP increases to a pre-determined threshold value,the bathyscaph is switched to a dead reckoning mode, and is located via a three-point positioning method of four extremely low frequency land base stations through combining with the characteristicsof extremely low frequency electromagnetic waves in a deep sea.

The invention discloses a combined wave energy collecting device. The device comprises a rack which is mounted in match with an offshore carrying platform, wherein a swinging rod which can swing in a reciprocating manner under the wave effect, a plurality of piezoelectric elastic beams which are uniformly distributed on a swinging circular arc of the swinging rod, and an electromagnetic generator which is driven by the swinging of the swinging rod, are arranged on the rack; a mass block is arranged on the end part, facing each piezoelectric elastic beam, of the swinging rod; a shifting sheet, which is arranged on each mass block, can be partially overlapped with the end part of each piezoelectric elastic beam and is used for shifting the corresponding piezoelectric elastic beam as the swinging of the swinging rod as well as impacting the corresponding piezoelectric elastic beam to cause high-frequency free vibrating. According to the combined wave energy collecting device, the electromagnetism and the piezoelectricity are combined to generate power, thus the wave vibration at extremely low frequency can be converted into high-speed rotating of the electromagnetic generator and the high-frequency vibrating of the piezoelectric elastic beams, and as a result, the high-power density output and high energy conservation efficiency can be achieved, namely, the device is able to fully utilize and collect wave energy.

The invention discloses a high-power signal emission control method based on a DDS. A DDS synthesis technology is adopted, synthesis of emitted signals is controlled by a program, a digital technology D-class high-frequency amplification module is adopted, and therefore the distortion degree of the signals is low. A PFC technology is designed, and therefore the power factor of the high-power emitted signals is increased and the emission efficiency of the high-power emitted signals is improved. A step wave generation module is designed, an intelligent emission control mode is adopted, the efficiency of switching between sine waves and step waves is high, intelligent software delay of the time of the rising edge and the falling edge of the high-power step square wave signals effectively retrains peak pulse interference, an extremely-low-frequency and high-power emission function is achieved, and the frequency phase is stable. The high-power step square wave signals suffer little peak pulse interference on an inductive load, and the efficiency of intelligent high-power emission is high.

After conventional tap water purification equipment, especially a water purifier with a ceramic filter element, is used for a period of time, a variety of impurities in the water are deposited on the surface of the filter element and in pores, resulting in poor water flow and reduced filtration capacity, so regular artificial cleaning needs to be conducted to restore normal water flow and filtration capacity; and the quality of drinking water for users is greatly affected. For conventional water purification equipment with the ceramic filter element, cutting off the water needs to be conducted, the machine is manually disassembled, and the filter element is taken out to be cleaned. The cleaning method is mainly based on artificial mechanical cleaning, which is time-consuming, labor-intensive and not thorough. In order to solve the problems that the existing water purification equipment can not be automatically cleaned and the safety of drinking water for the users can not be continuously guaranteed, the invention provides an intelligent self-cleaning ceramic water purifier. The water purifier can monitor the degree of use of the ceramic filter element inside the machine by itself. When the filter element needs to be cleaned, the period of using water by the users at extremely low frequency is intelligently selected and ultrasonic cavitation is used to clean the inside and outside and pores of the ceramic filter element.

The invention discloses a high-power extremely low frequency and ultralow frequency artificial source electromagnetic method for geological prospecting. In the method, a transmitting antenna is arranged in a region with extremely low electric conductivity; the qualified apparent resistivity of the region is in the range of 5,000 to 20,000 ohm m and the thickness of a high resistance layer of the region is in the range of 20 to 30km; the transmitting antenna is an extremely low frequency or ultralow frequency transmitting antenna, is erected in a low frame mode and has the length of not less than 60km; the transmitting antenna adopts a power grounding standard; grounding resistance is permanent; the resistance value of the grounding resistance is not more than 2 ohms; and a feeding transmitter has the power of not lower than 500kw, the frequency stability superior to 1*10<-8> and the current of 300 to 350A. For the artificial source electromagnetic method, a transmitted signal has high strength, the amplitude-phase is stable, the signal-to-noise ratio, anti-jamming capability, measurement accuracy and efficiency are high, the detection range is wide, measurement is simple and convenient, and conditions are provided for earthquake prediction, three-dimensional electromagnetic prospecting and development of an ocean resource detection technology.

The invention provides a time-frequency electromagnetic data collection device and method based on an extremely low frequency electromagnetic source. The high-power controllable current source emission control device provides high-power controllable alternating current for the extremely-low-frequency long-distance emission antenna, and the extremely-low-frequency long-distance emission antenna directly feeds the high-power controllable alternating current into the ground through grounding electrodes at the two ends of a grounding long wire. The ground time-frequency electromagnetic signal receiving and collecting device is in communication connection with an instrument vehicle arranged in the middle of a work area, and the instrument vehicle is provided with a computer for time-frequency electromagnetic collection, control, processing and data storage processing. And a computer on the instrument truck controls the ground time-frequency electromagnetic signal receiving and collecting device to collect time-frequency electromagnetic data. According to the method, the waveguide characteristic of the manually-transmitted extremely-low-frequency high-power alternating electromagnetic signals between the ground and the ionized layer is fully utilized, the signals are transmitted to a measurement work area thousands of kilometers away, the time-frequency electromagnetic data collection efficiency is improved, the signal-to-noise ratio of the time-frequency electromagnetic data is increased, and the operation cost is reduced.

A method and an apparatus for interfering with pathological cells survival processes, i.e. inducing directly or indirectly apoptosis, on living pathological cells, by using magnetic fields without adversely affecting normal cells. Static (S) and extremely low frequency (ELF) magnetic fields are used having low intensity comprised between 1 and 100 mT, preferably comprised between 1 and 30 mT. In particular SELF fields are used which are different sequences of S and / or ELF fields, i.e. S fields followed by ELF fields, ELF fields followed by S fields, S and ELF field together, as well as the presence of S or ELF fields alone, said ELF fields having a field frequency comprised between 1 and 1000 Hz. An apparatus for carrying out the method comprises means for generating static magnetic (S) fields crossing a working environment and / or means for generating electromagnetic extremely low frequency (ELF) fields over the working environment in addition to the S fields. Means are provided for modulating the S fields associated to the S fields generating means and varying the intensity of the S fields from 1 to 100 mT, preferably between 1 to 30 mT according to a predetermined function. Means may also be provided for modulating the ELF fields associated to the ELF fields generating means and imposing to the ELF fields a frequency between 1 and 1000 Hz with intensity comprised between 1 to 100 mT, preferably between 1 and 30 mT according to a predetermined function.

Disclosed is an extremely-low-frequency radio wave shielding test device. The device comprises a radio wave shielding cylinder and an in-cylinder test coil, the in-cylinder test coil is located in the radio wave shielding cylinder, the radio wave shielding cylinder comprises a first cylinder end cover, a second cylinder end cover, a thick-wall metal tube, screws, a dual hole cover and a shielding cover, the first cylinder end cover, the thick-wall metal tube and the second cylinder end cover are fixed into a whole through the screws to form a shielding cavity body portion of the extremely-low-frequency radio wave shielding test device, a disc support supporting a test solenoidal coil, a protective casing located outside the test solenoidal coil, the test solenoidal coil and a round tube used for winding of the test solenoidal coil are distributed in the in-cylinder test coil from outside to inside, a tube support and a test tube are arranged in a hole of the round tube, and the tube support is used for supporting the test tube. The extremely-low-frequency radio wave shielding test device is wide in shielding range, integrally airtight and high in shielding properties, good in shielding effect on medium and low frequency band radio waves, and applicable to professional laboratories.