2224 results about "Wave crest" patented technology

A flexible stent with excellent trackability and expandability comprises a plurality of radially expandable annular members 1 arranged in an axial direction thereof, and connecting elements 2 for connecting adjoining two annular members 1, adjoining annular members 1, 1 being connected by one or more of the connecting elements 2. The annular members 1 are radially expandable and each annular member 1 comprises two waved elements 11, 12 that repeatedly meander in parallel with or substantially parallel with each other and are coupled by coupling elements 13 at intermediate portions between wave crests and wave troughs of the waved elements 11, 12. The stent is excellent in trackability, which in turn makes it possible to pass through three-dimensionally meandering lumens. The stent is excellent in radial strength, substantially free from shortening and easy to provide a lateral hole.

The invention discloses a spiral waveform cutting metal wire as well as a manufacturing method and equipment thereof. The metal wire is a spiral waveform metal wire formed by rotating a periodic waveform metal wire along an axial center line, a wave crest and a wave trough of the metal wire are distributed along the axial center line, and a spiral diameter of the metal wire is equal to a wave height. The spiral waveform cutting metal wire disclosed by the invention can provide better mortar abrasive carrying capability in the process of cutting a rigid material through a stereostructure of the spiral waveform cutting metal wire, and the abrasive is not easily stripped from a cutting wire, therefore, the production speed and efficiency of technical processing of cutting and slicing silicon materials, precious stones and the like are greatly improved, and the surface quality of the sliced materials can be also improved.

The invention relates to a worm-type plastic corrugated pipe grooving machine. Function of conveying plastic corrugated pipes is completed by a worm curve fixed on a cutter bar of a grooving cutter; the functions of cutting and grooving are realized by one alloy cutter head arranged at the terminal of the worm curve, the worm curve is meshed with wave crests of the plastic corrugated pipes, the plastic corrugated pipes advance for one pitch when being pushed by the worm curve once the cutter bar rotates for a circle, namely the plastic corrugated pipes advance to the next wave crest from the current wave crest, the alloy cutter head arranged at the terminal of the worm curve carries out grooving on the current wave crest for once, the alloy cutter head arranged at the terminal of the worm curve is vertical to axes of the plastic corrugated pipes to ensure that a blade is in a cutting interval while the plastic corrugated pipes do not axially move, the plastic corrugated pipes continuously axially move along with rotation of the cutter bar, and the blade carries out grooving on the wave crest one by one. The grooving machine provided by the invention has simple mechanical structure, no independent pipe conveying device or electronic and electrical inductive control system is required, grooving position is accurate, grooving quality is greatly improved, and rejection rate is greatly reduced while grooving efficiency is greatly improved.

The invention provides a method for detecting an R wave crest of an electrocardiosignal. The method takes point to point difference vector as a base characteristic. The base characteristic has translational and rotational invariance and can overcome influences of baseline drift of the electrocardiosignal. Meanwhile, logarithm polar coordinate conversion is carried out on the difference vector to measure similarity of waveforms. The measurement is sensitive to morphological characteristics of the adjacent waveforms, can capture the whole contour information of the waveforms at the same time, and has robustness on waveform swing. In addition, the method can effectively eliminate influences of interference signals by setting appropriate thresholds. The method for converting the point to point similarity measurement into measurement of waveforms of the points accurately identifies and detects the R wave crest of the electrocardiosignal. The method is applied to related electrocardiogram analytical instruments, can accurately identify the R wave crest in the electrocardiosignal, and is favorable for improving detection and analysis capabilities of electrocardiogram analytical equipment.

The present invention relates to a wave energy conversion device (1), for use in relatively shallow water, which has a base portion (2) for anchoring to the bed of a body of water (6) and an upstanding flap portion (8) pivotally connected (12) to the base portion. The flap portion is biased to the vertical and oscillates, backwards and forwards about the vertical in response to wave motion acting on its faces. Power extraction means extract energy from the movement of the flap portion. When the base portion (2) is anchored to the bed of a body of water (6) with the flap portion (8) facing the wave motion, the base portion (2) and the flap portion (8) extend vertically through at least the entire depth of the water, to present a substantially continuous surface to the wave motion throughout the full depth of water from the wave crest to the sea bed. A plurality of devices can be interconnected to form one system. The distance between the plurality of flaps is dependent on the wavelength.

A taut mooring system for use on a mobile offshore jack-up platform while it is in an elevated operating condition. The elevated operating condition is with the hull jacked up a safe distance above the highest anticipated wave crests, on vertically movable legs which extend to the ocean floor. The mooring system consists of: radially spaced mooring line attachment means on the structure of the platform; suction piles that are radially spaced around the platform, consistent with the radial spacing of the mooring line attachment means; and taut mooring lines which radially connect the suction piles to the attachment means. The flexibility of the taut mooring system provides the ability to coact with the platform's free standing storm resistance capabilities, yielding enhanced capabilities that will enable the platform to safely resist storm induced forces that the platform would not normally be capable of withstanding, and to enable the platform to be used with longer legs in deeper water.

The invention discloses a heart rate variability analyzing method based on an amplitude spectrum and instruments. The method comprises the following steps that a human body autonomic nervous function monitor is installed, after amplification, filtering and analog-digital conversion are carried out on electrocardio signals collected by an electrocardio electrode slice, an RR interval time sequence is built, the QRS waveform of the electrocardio signals has the features of large amplitude, short time limit, steep waveform and easy recognition, the key for obtaining HRV signals is that the R wave of an electrocardiogram is accurately calibrated, and according to the morphological characteristic of an R wave picture, the wave crest of the R wave is the maximum positive value in a single signal period; the instruments included in the method comprise a preamplifier module used for amplifying the electrocardio signals, a filter module, an A/D conversion module, an R crest positioning module, a signal pseudo crest pseudo differential eliminating module, an RR sequence forming module, an interpolation module and a display module which are sequentially connected, the preamplifier module is connected with the electrocardio electrode slice through a guide line, and the electrode slice is arranged on the surface of the human body skin and used for collecting the electrocardio signals of the human body.

The invention discloses a monitoring method for time reversal damage to no-datum Lamb wave of an engineering structure. The monitoring method comprises the following steps of: distributing a group of excitation/sensing arrays on a structure to be monitored; building detection channels, and collecting Lamb wave response signals of all excitation/sensing channels; intercepting the response signals, and then conducting time reversal to obtain time reversal structure response signals; loading the time reversal structure response signals onto corresponding excitation, and collecting time reversal focusing structure response signals on the corresponding sensing; and in the time reversal focusing structure response signals of all the detection channels, extracting the occurrence time difference of focusing main wave crest and sidelobe signals, taking the occurrence time difference as a characteristic parameter, calculating to obtain the position and approximate range of the damage by adopting an ellipse positioning method, and analyzing and judging the health condition of the structure to be detected. With the method, the wave packet extension and signal aliasing caused by frequency dispersion can be eliminated, no-datum active positioning and detection to the Lamb wave can be realized, and the healthy monitoring practicalization of the structure can be benefited.

The invention discloses an automatic assembling machine for a door handle. The automatic assembling machine comprises a disc rotation mechanism, wherein the disc rotation mechanism is composed of a turntable and a turntable driving mechanism which is connected with the turntable; a plurality of jigs are uniformly distributed on the periphery outer side of the turntable at equal intervals; a snap spring automatic feeding mechanism, a first gasket feeding mechanism, a second gasket feeding mechanism, a wave crest gasket feeding mechanism, a locking meson feeding mechanism and a torsional spring feeding mechanism are sequentially arranged in the rotation direction of the turntable; a handled square rod feeding mechanism for automatically pressing a handled square rod in the corresponding jig is arranged on one side of the torsional spring feeding mechanism; a belt conveying mechanism is arranged on one side of the square rod feeding mechanism; and a blanking manipulator is arranged between the belt conveying mechanism and the turntable. According to the automatic assembling machine for the door handle, with the adoption of disc rotation, parts of the door handle are sequentially assembled on the corresponding jigs in a disc, so that the working efficiency of door handle assembly and the quality of a product are improved, the automation degree is high with automatic completion of the whole assembling process, and the labor cost is lowered.

The invention discloses a dielectrophoresis demulsification mechanism-based novel crude oil electric dehydration and desalination method and dielectrophoresis demulsification mechanism-based novel crude oil electric dehydration and desalination equipment. The core part of the equipment is an electrode component which may consist of vertically suspended corrugated-plate-shaped electrodes installed with the wave crests and wave troughs of each two adjacent electrodes corresponding one by one respectively, or may consist of corrugated-plate-shaped electrodes and flat-plate-shaped electrodes, which are combined alternately and arranged vertically, wherein the surface of each electrode is coated with a compact insulation layer. When a high-voltage current is applied onto the electrode component, horizontal and non-uniform electric fields are generated between electrode plates to arouse the dielectrophoresis agglomeration of dispersed phase water particles in crude oil emulsion. The method and the equipment disclosed by the invention can meet the dehydration and desalination requirements of crude oil emulsions with different water content, particularly the agglomeration growth and fine dehydration and desalination requirements of dispersed phase small water particles in crude oil emulsion of oil refineries. In addition, the method and the equipment help greatly reduce the use amount of chemical demulsification agent, reduce overall operation cost and improve economic benefit of the oil refineries.

The invention discloses a full-waveform laser radar echo data gaussian decomposition method based on a genetic algorithm. The method is mainly formed by five steps including echo denoising, initial wave crest extracting, initial parameter estimating, waveform fitting and precision judging; when the precision of initial fitting meets the requirements, second fitting is not carried out, when the precision of the initial fitting does not meet the requirements, iteration fitting is carried out, and in each iteration, the fitting precision is improved by a method of increasing a gaussian component until a stopping condition is met; a gaussian function is used for fitting echo data of a full-waveform laser radar; and a gaussian filter method is adopted to filter noise of the echo data of the full-wave form laser radar, the number of initial gaussian components is confirmed by extracting a peak value point, an initial parameter range is estimated, fitting and precision adjusting are carried out on the echo data of the full-waveform laser through the genetic algorithm, an echo gaussian decomposition software system based on the genetic algorithm is manufactured, and echo decomposition operation is simplified.

The invention discloses a detection circuit and method for a zero crossing point of an alternating current power supply. A half-wave shaping circuit is formed by a current limiting resistor and a light-emitting diode, a cathode of a protective diode is connected with the current limiting resistor, and the other end of the current limiting resistor is connected with an input end of the alternating current power supply; and a photistor collector is connected with a singlechip and a direct current power supply through another light-emitting diode. The singlechip firstly detects twice level trip interruption time t1 and t3 of a previous alternating current power supply positive half-wave, calculates a previous wave crest moment t2, then detects the twice level trip interruption time t4 and t6 of a next alternating current power supply positive half-wave and a wave crest time t5 at the time to obtain an alternating current power supply period, and outputs a control signal to control a thyristor to be accurately triggered with a next zero crossing point moment as a benchmark. The detection circuit and method for the zero crossing point of the alternating current power supply enhance the driving capacity of a voltage without other gate circuits, has no requirements on amplitude and frequency of the alternating current power supply and no limits on a working voltage of the light-emitting diode and can allow a voltage value of the alternating current power supply to fluctuate in a large range.

A corrugate fin of an evaporator includes wave crest portions, wave trough portions, and flat connection portions connecting together the wave crest portions and the wave trough portions. Opposite end portions of a cutout extend to corresponding connection portions located at opposite ends of the wave crest portion and the wave trough portion. A projection projecting inward is formed integrally with end portions of the connection portions, the end portions of the connection portions corresponding to opposite ends of the cutout. The projection extends between the end portions of the connection portions located at the opposite ends of the wave crest portion and the wave trough portion. The projection projects inward in a shape resembling a lying letter V. The evaporator exhibits excellent drainage of condensed water and enables high work efficiency in manufacture thereof.

The invention provides a low-Ag hypo eutectic Sn-Cu-Ag lead-free solder the components of which are 0.5 to 0.65wt percent of Cu, 0.1 to 0.45wt percent of Ag, 0.001 to 0.1wt percent of Ni, 0.001 to 0.3wt percent of Sb, 0.001 to 0.2wt percent of Bi and/or In, 0 to 0.01wt percent of P, 0 to 0.03wt percent of Ge and the rest is Sn. The solder is further characterized in that (1) the content of Ag in the solder of Cu plus Ag is less than 1wt percent is not more than 0.45wt percent; (2) the gross of the microelements like Ni, Sb, Bi, In, P, and Ge, etc., that are added is not more than 0.5wt percent. The solder has the advantages of low cost and excellent oxidation, wettability and overflow resistances, can remarkably reduce the waste of the solder, improve the forming of the welding point, remarkably reduce the connecting defects of braze welding. The solder can replace a Sn-Cu-Ag hypo eutectic material and is suitable for the wave crest welding, dip soldering as well as manual welding and reflow soldering for electric products.

The invention relates to a reluctance brushless multipolar rotational transformer. And the external circular surface of a rotor is uniformly provided with P wave crests and P wave throughs, where these wave crests and wave throughs are smoothly interlinked to compose the wavy external circular surface of the rotor, and excitation, sine and cosine windings are positive phase-to-negative phase connected in series. As a constant voltage alternating current passes through the excitation winding, the sine and cosine windings output voltages whose electromotive force amplitudes make p sine and cosine variations with the rotation angle of the rotor. And the invention has characters of simple structure, convenient to make, and especially applied to the rotor position sensor of a brushless DC motor.

A heat exchanger assembled from multiple heat exchanging tubes. Each of the multiple heat exchanging tubes is formed as a flattened tube of 0.5 mm in thickness by press work or bending work of a stainless steel plate member having a thickness of 0.1 mm. Each of the multiple heat exchanging tubes is structured to have multiple lines of sequential wave crests and multiple lines of sequential wave troughs formed on each of flattened faces of the heat exchanging tube. The multiple lines of the sequential wave crests and the multiple lines of the sequential wave troughs are arranged to have a preset angle γ relative to a main stream of an air flow. The lines of the sequential wave crests and the lines of the sequential wave troughs are symmetrically folded back about folding lines arranged at a preset interval W along the main stream of the air flow.

The invention belongs to the technical field of space time self-adaptation processing and particularly relates to an airborne radar space time self-adaptation processing method with sparse representation. The method comprises the steps that (1) the sparsity of the clutter spectrum is used, and a high-resolution estimation method based on sparse representation is used for estimating the clutter spectrum power spectrum; (2) a clutter wave crest curve fitting method based on an RANSAC method is used for removing fake peaks in the clutter spectrum obtained based on sparse representation; and (3) the clutter wave power spectrum with the fake peaks removed is used for estimating a clutter covariance matrix (CCM) and an aerial carrier flying parameter stably. Compared with a traditional STAP algorithm, the method has good clutter rejection performance under a small sample condition, and convergence speed is obviously improved.