96 results about "500 kHz" patented technology

Tumors in portions of a subject's body that have a longitudinal axis (e.g., the torso, head, and arm) can be treated with TTFields by affixing first and second sets of electrodes at respective positions that are longitudinally prior to and subsequent to a target region. An AC voltage with a frequency of 100-500 kHz is applied between these sets of electrodes. This imposes an AC electric field with field lines that run through the target region longitudinally. The field strength is at least 1 V/cm in at least a portion of the target region. In some embodiments, this approach is combined with the application of AC electric fields through the target region in a lateral direction (e.g., front to back and/or side to side) in order to apply AC electric fields with different orientations to the target region.

A cleaning method capable of processing at room temperatures without conducting heating, uses little chemicals and water, and does not require special devices or materials. The chemical cleaning processes and rinse processes employ pure water or ultrapure water in a semiconductor wet cleaning process, rinse water or chemicals which suppresses formation of surface oxide films, removes particles and prevent their redeposition, and aids in the hydrogen termination of the silicon atoms. The cleaning method of the resent invention includes cleaning which is conducted using pure water containing ozone, cleaning conducted using a cleaning liquid containing HF, H2O, and surfactant, while applying vibration having a frequency of 500 kHz or more, cleaning conducted using pure water containing ozone, cleaning conducted using a cleaning liquid containing HF and H2O in order to remove oxide films, and cleaning which is conducted using pure water. After cleaning a material to be cleaned using chemicals, rinsing is conducted using pure water or ultrapure water containing hydrogen gas in an amount of 0.5 ppm or more and containing oxygen gas in an amount of 100 ppb or less.

Cancer cells can be synchronized to the G2/M phase by delivering an anti-microtubule agent (e.g., paclitaxel or another taxane) to the cancer cells, and applying an alternating electric field with a frequency between 100 and 500 kHz to the cancer cells, wherein at least a portion of the applying step is performed simultaneously with at least a portion of the delivering step. This synchronization can be taken advantage of by treating the cancer cells with radiation therapy after the combined action of the delivering step and the applying step has increased a proportion of cancer cells that are in the G2/M phase. The optimal frequency and field strength will depend on the particular type of cancer cell being treated. For certain cancers, this frequency will be between 125 and 250 kHz (e.g., 200 kHz) and the field strength will be at least 1 V/cm.

A sensor is provided for the detection of a marker in a sample in which the sensor includes a high frequency 500 kHz-1 GHz piezoelectric ceramic resonator, with the system measuring resonant frequency change. In one embodiment, the piezoelectric sensor operates in the thickness extensional (TE) mode, with the high frequency and TE mode permitting fabrication of an exceptionally small size sensor capable of being arrayed in a handheld unit.

A self-tuning resonator for use in a transmitter apparatus for inducing alternating currents in a buried conductor. The resonator is dynamically tuned at frequencies below 500 kHz by exploiting the inherent voltage-variability of net capacitance in multilayer ceramic capacitors. The transmitter apparatus provides improved efficiency and induced output power suitable for use in a man-portable locator system, providing a very high magnetic field output from a physically small battery-powered resonator at frequencies under 500 kHz. The resonator exhibits a very low equivalent series resistance (ESR) and is adaptively retuned to a predetermined resonant frequency responsive to any changes in resonance arising from phenomena such as component heating, thereby supporting very high tank circuit currents from battery-powered source to produce very high magnetic flux output.

The invention discloses a low-temperature sintered high-permeability NiCuZn ferrite material for a wire wound chip inductor and a preparation method of the ferrite material. The ferrite material comprises the following main components based on oxide content: 40.5 to 49.6 moles percent of Fe2O3, 30 to 47 moles percent of ZnO, 5 to 20 moles percent of CuO and the balance of NiO. The preparation method comprises the following steps of: (1) mixing raw materials, (2) performing primary sanding, (3) performing primary spray drying and granulation, (4) pre-sintering, (5) adding trace elements, (6) performing secondary sanding, (7) performing secondary spray drying and granulation, (8) molding and (9) sintering. By adding auxiliary components such as NaCO3, B2O3, Ta2O5 and the like, the sintering temperature is greatly reduced, the sintering temperature is below 900 DEG C, the high-frequency electromagnetic performance of the material is greatly improved, the sintering density of the material is improved, the mechanical strength of the material is improved, and the manufacturing process requirement of the wire wound chip inductor is met; and on the other hand, energy is saved, and the producing and manufacturing costs are greatly reduced. The initial permeability of the material is 2,850; the specific loss coefficient of the material is less than 5.5*10<-6> under the test conditions of 100 kHz and 0.25mT; and the specific loss coefficient of the material is less than 25.6*10<-6> under the test conditions of 500 kHz and 0.25mT.

A non-invasive hand-held treatment imaging probe for treatment of acute blood flow disturbances and states of low blood perfusion. The treatment imaging probe is operable to emit high intensity therapeutic mechanical acoustic waves while under ultrasonic imaging guidance. The probe has a substantially rigid application surface, sized to enable seating within a rib space of a patient (i.e. for cardiac applications), comprising the combination of an engagement face of an ultrasonic imaging transducer and an application end of a high powered therapeutic actuator operable in about the 1-500 kHz (and preferably 1-150 kHz) range. Treatment imaging probe can be used as an adjunct to thrombolytic therapy in the treatment of acute thrombotic vascular obstructions, such as in acute myocardial infarction, or alternatively to enhance localized delivery of angiogenic agents or other useful medications to targeted vascular regions.

The invention relates to a sensor device for monitoring the transient voltage of a broadband integral type power grid, which is characterized in that the sensor device is connected with a sensor (1), a grounded resistor (2), a voltage follower (3), an integral circuit (4), an opposite-phase amplifying circuit (5), a filter circuit (6), an over-voltage protecting circuit (7) and an impedance matching circuit (8) connected in sequence to form a signal circuit (9); the signal circuit (9) is connected with a PCI (Peripheral Component Interconnect) capture card through a transmission cable (11); the filter circuit (6) is connected with the PCI capture card through a transmission cable (11); the filter circuit (6) is connected with the PCI capture card through a transmission cable (12) after through a triggering circuit (10); the sensor (1) is a high-frequency current magnet balance Hall sensor, wherein the frequency band trait thereof is selected between DC and 500 kHz(-3dB), the load impedance thereof is selected between 50 and 160 omega, and the operating voltage thereof is DC12V. The design only comprises some electronic elements; the sensor device has the advantages of lower cost, smaller volume, and more convenience for spot installation without considering floor space.

The tumor treating thermotherapeutic alternate magnetic field system in medical equipment field includes alternate power source system, magnetic field generating system, magnetic path system thermotherapeutic temperature measuring and feeding back system, alternate magnetic field strength measuring and feeding back system, treating bed system, shielding system and central operation and control system. The alternate magnetic field system has power source output frequency of 1-500 KHz, magnetic conductor made of soft magnetic material of high magnetic conductivity, cross section area of the magnetic conductor gap in 10-1000 sq cm, fixed or adjustable gap of 5-60 cm, and magnetic field strength inside the gap of 1-50 kA/m. Owing to magnetic path system comprising magnetic conductor and gap, the treating part of the alternate magnetic field system has homogeneous magnetic field distribution, high heating efficiency and reasonable heating mode.

An ice protection system and method capable of anti-icing and de-icing aerodynamic structures and surfaces is provided comprising a Resistive Heat Coat (RHC) controller and a heating device. The RHC controller comprises a RHC power circuit topology having a processor and a buck converter. The RHC controller further comprises a RHC control algorithm. The heating device comprises a plurality of resistive heating elements, such as CNT-based resistive heaters. The ice protection systems and methods disclosed can achieve an efficiency of 98% or greater while employing a direct current (DC) power supply and “hard switching” with a switching frequency of at least 500 kHz.

The invention relates to a low frequency strong magnetic field shield material, which is composed of a single layer or multiple layers high conductivity material and a ferromagnetism material. The shield material is combined by the high conductivity material and the ferromagnetism material according to different orders, layers and thicknesses. The ferromagnetism material is performed with heat processing during the process for preparing the shield material. Considering the easy generation of magnetic saturation phenomenon of high magnetic permeability ferromagnetism material under strong magnetic field environment, a highly resistance magnetic saturation material is selected to reduce the strong magnetic field, then the high magnetic permeability material is employed to shield attenuated magnetic field, The high conductivity material is employed as a magnetic barrier layer between the highly resistance magnetic saturation material and the high magnetic permeability material layer, and the low frequency strong magnetic field shield material can partially shield the alternating magnetic field. According to the invention, the thickness of the shield material is about 0.2mm, the shield efficiency of the low frequency strong magnetic field at 10 kHz-500 kHz can reach 40 dB, and a technical problem that how to increase the shield efficiency of the low frequency strong magnetic field under the condition that the shield material allowanced thickness is limited can be solved.

This invention is a kind of method used to detect the component of human body. In order to solve problems of limitation of the method of detecting the body component of human body, this invention discloses a kind of detecting method. The procedures are as follow: age and sex are inputted into the microprocessor; body height and weight are measured by hypsometer and weighing scale, then inputted into the microprocessor through A/D converter. The biological resistance between right hand and left foot, left hand and right foot of the examiner measured fewer than 50 KHz, 250 KHz, 500 KHz by the resistance measuring system are inputted into the microprocessor, and then we can get the results of the person examined by the empirical formula solidified in the microprocessor. This invention is designed according to the Chinese people, it can quickly measure and computer the exact data of the several bogy components.

The invention discloses a medium-frequency ultrasonic atomizing spray head with polarizing in radial thickness direction. The integral vibration direction of the spray head is the axial direction. The medium-frequency ultrasonic atomizing spray head with polarizing in radial thickness direction is characterized in that a piezoelectric ceramic crystal pile consists of four piezoelectric ceramics with polarizing in the radial thickness direction, and the axial thickness w of the piezoelectric ceramic is greater than the radial thickness t; the axial deformation is greater than the radial deformation when the piezoelectric ceramic crystal pile vibrates, and the working frequency of the piezoelectric ceramic can reach 300 KHz to 500 KHz. The medium-frequency ultrasonic atomizing spray head with polarizing in radial thickness direction has the advantages that smaller mist droplets can be obtained, and the chemical structure of nutrient liquid is not damaged; the SiC (silicon carbide) ceramic crystal pile is used as a front cover plate and a back cover plate, thereby overcoming the defect that the working efficiency cannot be higher than 120 KHz when the traditional longitudinal composite type piezoelectric transducer adopts the metal material to form the front cover plate and the back cover. The spray head can be applied to the filed of atomizing culturing.

System, method, and computer program product embodiments are provided that can support touch interaction on a projective capacitive (PCAP) display system in the presence of water contamination. According to an embodiment, a system includes a touchscreen coupled to a controller. The controller determines the presence of water contamination on the touchscreen, and obtains measurements during a mixed-mode measurement frame that includes a self-mode measurement and a mutual-mode measurement. Based on the measurements obtained, the controller determines a touch on the touchscreen in the presence of the water contamination on the touchscreen. In some embodiments, the self-mode measurement includes measurements collected at a both lower and a higher drive frequency, the higher drive frequency may be in the frequency range of 100 kHz to 500 kHz. In another embodiment, the self-mode measurement includes simultaneously measuring both horizontal-electrodes and vertical-electrodes.

A wireless detonator is provided with: a detonation part; a control part for the detonation part, the control part being connected to the detonation part; a tube for accommodating the detonation part and the control part; and a detonation-side antenna used by the control part for wireless communication and capable of being used for sending and receiving without separately having a transmission-only antenna and a reception-only antenna; the detonation-side antenna being a soft magnetic body coil antenna, and the control part receiving, via the detonation-side antenna, a transmission signal at an operating frequency of 100-500 KHz.

The invention belongs to the technical field of soft magnetic ferrite materials. A manganese zinc ferrite material is formed by main components and additives. According to a mass percent of a substance, and calculated by oxides, the main components comprise: 70-72.5% of Fe2O3, 4.5-5.5% of ZnO, 1.5-3.5% of NiO, 1-2% of Sm2O3, and the balance of Mn3O4. The manganese zinc ferrite material has the following beneficial effects: an initial permeability is 3500+(-)25%, and the valley point power loss within a temperature area in 25-140 DEG C is up to 270 kw/m<3>, TC is greater than 270 DEG C. The power loss is less than 280 kw/m<3> under the conditions of 500 KHZ, 50 mT, and 100 DEG C, and the power loss is less than 480 kw/m<3> under the conditions of 1 MHZ, 30 mT, and 100 DEG C.

Disclosed is a high-frequency large-power silicon carbide MOSFET module. The high-frequency large-power silicon carbide MOSFET module comprises a heat dissipation substrate, a shell and a circuit structure packaged into the shell. The shell comprises an outer shell and an outer cover covering the outer shell. The circuit structure comprises a power terminal, a signal terminal, an insulating ceramic substrate, a silicon carbide MOSFET chip and a silicon carbide SBD chip. The insulating ceramic substrate is welded to the heat dissipation substrate through high-temperature reflow soldering, and the silicon carbide MOSFET chip and the silicon carbide SBD chip are welded to the insulating ceramic substrate, connected with the circuit structure etched on the insulating ceramic substrate and connected with each other through an aluminum wire. At least three power terminals are welded to corresponding positions of the insulating ceramic substrate. The high-frequency large-power silicon carbide MOSFET module can be applied to the application field with the switching frequency larger than 500 kHz and the output power larger than 100 kW.

The invention discloses a high frequency manganese-zinc soft magnetic ferrite material and a preparation method and applications thereof. The high frequency material comprises a main component and anauxiliary component; the main component comprises Fe2O3, MnO, ZnO, and NiO; and the auxiliary component comprises Ca2CO3, V2O5, Nb2O5, K2CO3, Co2O3, and SnO2. By introducing nickel(II) oxide into themain formula, a quaternary formula system is formed, namely a nickel zinc ferrite system is added into a manganese-zinc ferrite system, the grain size and resistance can be well controlled, thus the high frequency loss is reduced, the high frequency material has a high saturation flux density and a high Curie temperature and is suitable for being used in a high frequency environment (500 KHz to 1MHz). By controlling the pre-burning temperature, sintering temperature, and particle size of powder, the saturation flux density is increased, and the functional loss is reduced.

The invention discloses an intelligent human body composition scale based on double-frequency bioelectrical impedance measurement and cloud computing. The intelligent human body composition scale comprises an electronic scale detection system (10), wherein the electronic scale detection system (10) comprises a main control panel (11), a double-frequency bioelectrical impedance detection unit (12) and an electrode slice (13); the electrode slice (13) is electrically connected with the double-frequency bioelectrical impedance detection unit (12); the double-frequency bioelectrical impedance detection unit (12) is electrically connected with the main control panel (11); an electronic scale data transmission module (20) is electrically connected with the main control panel (11); the double-frequency bioelectrical impedance detection unit (12) comprises two frequency generators which are separately connected with the electrode slice (13); one frequency generator generates 500 KHz high frequency, and the other frequency generator generates 50 KHz low frequency; through the time-division measurement of human body impedance under the conditions of 500 KHz high frequency and 50 KHz low frequency, the intracellular fluid characteristic and the extracellular fluid characteristic of a human body can be fully distinguished from each other, and the correlation between the measurement result of the intelligent human body composition scale and a professional direct testing result can be remarkably improved.