125 results about "Sinistral and dextral" patented technology

A disc replacement spinal interbody fusion device is provided having a central sleeve with oppositely left and right-hand threaded axial bores with different diameters. Circumferential threaded apertures are located on the sleeve and open into the sleeve bores. The device has two opposing plates which are oval-shaped and centrally, axially bored. Each plate has a perpendicular shaft with an axial bore which communicates with the shaft bore. The first shaft has external left-hand threads and the second shaft has external right-hand threads, each to mate with different bores of the sleeve. The outside diameter of the first shaft is smaller than the inside diameter of the second shaft, allowing the two shafts to axially engage. The spinal interbody fusion device operates like a turnbuckle, vertically expanding when the sleeve is rotated in one direction and retracting when the sleeve is rotated in the opposite direction. The assembled device defines an open channel axially. Once the fusion device is set at its proper height, set screws are threaded into circumferential apertures of the sleeve to compress against the shaft threads of each plate to maintain a fixed height. In situ, axial loading of the spinal column upon the fusion device creates a bending moment manifested by a flexing action of the plates to generate opposing axial directional forces which replicate the physiological function of shock absorption, load bearing and load transmission.

The information signals are transferred to end users, customers, or service subscribers using at least two signal sources, generally satellites, and polarized radiation. Two polarization modes are employed, with the preferred modes being left-hand and right-hand circularly polarized radiation, although other polarization modes may be employed. The total number of channels can be divided among the polarization modes and transferred to end users either through the use of polarization switching in the receivers to selectively switch between the satellites, or by switching elements in the satellites (sources) to switch between polarization modes used for transmission.

A balancing valve for the engineering machine with 8-50 tons of lifting weight is composed of main valve and pilot valve. The said main valve consists of cylindrical valve body and main valve core. The said pilot valve is positioned in the main valve core. The core of pilot valve is linked to main valve core via springs. The main valve core is linked to valve body via more springs with different spriral directions and rigidities. Its advantages include correct, sensitive and reliable control, and preventing the burble dropping down of load.

The invention belongs to the technical field of electromagnetic wave polarization detection, and particularly discloses an efficient microwave polarization detection device based on a photonic spin Hall effect. For the detection device, electromagnetic wave to be detected is decomposed into left-hand circularly polarized beam and right-hand circularly polarized beam through the efficient photonic spin Hall effect, the module values and phases of the left-hand circularly polarized beam and right-hand circularly polarized beam are respectively measured, and backstepping is carried out to obtain the polarization of the electromagnetic wave to be detected. The photonic spin Hall effect is realized through linear geometry Berry phase gradient of total-reflection type meta-surface with a spin structure. Compared with the traditional polarization detection manner (linear polarization loudspeakers opposite to each other are used for directly measuring x component and y component of electromagnetic wave), the efficient microwave polarization detection device has the advantages that higher convenience and quickness are achieved, the errors are few, and the stability is better. The operating frequency of the device is 10-14GHz, and the structure constants of meta-atoms are scaled in equal proportion or redesigned, so that the operating frequency can be applied to other operating frequency ranges.

The invention relates to a single-layer planar chirality metal structure circular polarizer which belongs to electromagnetic wave devices, and belongs to the technical field of electromagnetic waves of optics, terahertz, microwaves and other frequency bands. The circular polarizer is formed by a single-layer metal structure with planar chirality, and the functions of the circular polarizer are achieved on the basis of a one-way mode switching principle. The circular polarizer is easy to machine and integrate, thin, small in size and compact in structure, has high efficiency of screening on left-hand and right-hand circular polarization electromagnetic waves, and is low in device absorption loss and high in transmittance. By changing the design of the size and the structural design of the circular polarizer, the circular polarization function can be achieved at different electromagnetic frequency bands such as optics, terahertz and microwaves. The circular polarizer can achieve low-cost and large-area manufacturing, and has important application in the fields of optical microscopy, three-dimensional display, laser technologies, communication, radar and the like.

The invention relates to a thread cartridge balanced valve which is applicable to a working condition with a mutative load and especially engineering machinery which requires load downlink controlling and makes an effect on balancing the load gravity and the load speed. The thread cartridge balanced valve comprises a valve body and a valve core, wherein the valve core is connected with the valve body through a spring set composed of a plurality of springs which are embedded with each other by screwing leftwards and rightwards respectively and have different rigidity to form a multi-load sensitive entirety. The valve core integrates the functions of the existing main valve core and the existing pilot valve core; the reaction speeds are completely consistent so that load is more stable during the descending process and no low-frequency shaking phenomenon occurs, thus guaranteeing the safe reliability of a system; and when a hose decompresses, the main valve core can automatically and rapidly close an oil channel between a main oil port B and a main oil port A, prevent the stall speed of the load from descending, and serve as a hydraulic lock.

The invention discloses an all-fiber current transformer and a method thereof, aiming to overcome the defects that a traditional electromagnetic current transformer is easily subjected to electromagnetic interference and has complicated insulation structure, magnetic saturation existence and the like. The technical scheme of the invention comprises the following steps of: demodulating light output by a light source into X-axis polarized light and Y-axis polarized light by a Y-branch integrated optical phase modulator; converting into sinistral circular polarized light and dextral circular polarized light in a lambda/4 retarder; generating a magnetic field by a current in a lead due to the faraday effect; returning the two beams carrying faraday effect phase information to the Y-branch integrated optical phase modulator to intervene when beams in optical fiber is transmitted around the lead; and enabling an interference result to enter a subsequent treatment system from the optical fiber coupler to acquire the faraday effect phase information at the measuring point. The invention avoids the hidden danger of ferromagnetic resonance and magnetic saturation by adopting the optical fiber as a sensing medium and has a series of advantages of high detection accuracy, good environmental suitability, and the like.

This invention belongs to pharmacy field, it relates optical pure mei pu ta fen and its preparation method and application. Racemation mei pu ta fen is splited by optical pure tartaric acid evolving object to get optical pure monomer, enantiomeric excess testing is done through capillary electrophoresis method, their e.e.valude are both excess 99 percent. Laevorotation and dextrorotation mei put a fen absolute configuration is decided by single crystal X-diffraction method as S and R. the R(+)mei pu ta fen has srong activity in analgesia activity testing, but S(-)mei pu ta fen has more stronger activity in acetylcholine esterase restrain activity testing, analgesic medicine and senile dementia medicine can be further prepared.

The invention relates to a device and method for realizing photoinduced rotation based on double-beam light trap, belonging to the technical field of optical micro-control systems. The device is composed of two light beam adjusting systems, a sample cell, an illumination system and a rotating speed measuring system. The two light beam adjusting systems respectively generate leftward-rotation circularly polarized light and rightward-rotation circularly polarized light which are the same in power but different in wavelengths, the two beams of circularly polarized light are input at the two sides of the sample cell and aligned to capture and rotate particles of birefringence material, the illumination system under the sample cell provides illumination, and the rotating speed measuring system over the sample cell is used to observe and measure the rotating speed of the particles of the birefringence material. The device and method have the advantages of higher control precision, higher rotating speed of the particles and higher stability.

The invention relates to a disposable thread forming numerical control grinder for a micro milling cutter for a printed circuit board, which comprises a feeding mechanism, a grinding thread mechanism, an unloading mechanism and a worktable switching shaft. The grinding thread mechanism consists of a grinding left-hand thread mechanism and a grinding right-hand thread mechanism, the grindings of the left-hand thread and the right-hand thread are switched by using the worktable switching shaft when a milling cutter is machined, then a numerical control program memorized in the numerical controlgrinder is pressed, and a manipulator lays the grinded milling cutters on a tray in order; and the grinding left-hand thread mechanism mainly comprises an X1-axis linear slide rail, a Y1-axis linear slide rail, a left-hand angle adjusting plate, a grinding main shaft and a diamond abrasive wheel, while the grinding right-hand thread mechanism mainly comprises an X-axis linear slide rail, a Y-axislinear slide rail, a right-hand angle adjusting plate, a grinding main shaft and a diamond abrasive wheel, wherein the four linear slide rails are provided with a servo motor and a ball screw respectively. When producing the micro milling cutters, the disposable thread forming numerical control grinder can not only reduce production cost and improve working efficiency and product percent of pass,but also save labor and time and is convenient to operate.

An optical magnification system comprises two Pancharatnam lenses, and provides a first magnification for left-hand circularly polarized light and a second magnification different from the first magnification for right-hand circularly polarized light. An optical magnification system comprises two lenses, each having different focal lengths for left-handed and right-handed circularly polarized light, respectively, and configured to provide a first magnification for left-handed circularly polarized light and a second magnification different from the first magnification for right-handed circularly polarized light.

The invention discloses an arbitrary column vector light generating device and an arbitrary column vector light generating method based on orthogonal polarization modulation. The arbitrary column vector light generating device comprises a linearly polarized light generating module, an orthogonal polarization modulation module and a light intensity detection module, wherein the linearly polarized light generating module is used for generating linearly polarized incident light satisfying requirements; the orthogonal polarization modulation module is used for performing orthogonal polarization modulation on the linearly polarized incident light to obtain column vector light in an arbitrary polarization state; and the light intensity detection module is used for detecting the obtained column vector light. According to the arbitrary column vector light generating device, left-handed circularly polarized vortex light and right-handed circularly polarized vortex light synthesizing the columnvector light are generated by means of two vortex light generating devices respectively, and the column vector light in an arbitrary polarization state can be obtained through modulating a phase difference between phase diagrams loaded on the two vortex light generating devices; the arbitrary column vector light generating device has the advantages of simple and reasonable light path and high repeatability; and the entire device just needs one beam of light to realize the generation of the column vector light, the energy utilization rate is high, the generated light beam is more stable and thequality is higher.

The invention relates to an automatic turnover bed which comprises bed surfaces, rotating shafts, conveyor belts and a supporting rod, wherein the conveyor belts are arranged on the bed surfaces, anda human body can be turned through the translation of the conveyor belts; one rotating shaft is respectively arranged at the outer side of each bed surface, and a friction pulley is arranged on each rotating shaft; two fixed shafts are arranged at the inner side of each bed surface, and a bearing and a roller are arranged on each fixed shaft; a plurality of short conveyor belts are sleeved on therollers and the friction pulleys; the middle parts of the two bed surfaces are connected together through a hinge, and a gap exists; the lower surfaces of the two fixed shafts at the inner side of the bed surface are connected with the supporting rod, and the lower surface of the supporting rod is connected with a sliding nut; the sliding nut is installed on a guide screw with left-handed and right-handed threads; the bed surfaces can descend to form a V shape or ascend through the open and close movement of the sliding nut; and when the bed surfaces ascend or descend, the two rotating shaftsat the outer side can horizontally slide in a slotted hole.

A wavelength-modulating polarized surface plasma sensor is composed of laser device, polarizer, sensing part, 1/4 wave plate, analyzer, photoelectric converter, phase-locked amplifier, computer and signal generator. The laser beam is converted to linear polarized beam by polarizer and them going to reflection surface of sensing part. The reflected beam is converted to left-hand turning and right-hand turning circular polarized beams by 1/4 wave plate; then the beams are converted to linear polarized beam by analyzer. After it is converted to electric signal, it is outputted to computer via phase-locked amplifier to display result. The signals from signal generator are used for modulating the wavelength of laser beam while inputting it to phase-locked amplifier for demodulating it. Its advantages are low hite noise and high resolution.

The invention discloses a method for preparing nebivolol hydrochloride. An L-nebivolol hydrochloride with four chiral centers and a D-nebivolol hydrochloride with four chiral centers are obtained through carrying out processes of bromination, a wittig reaction, a reduction reaction, a hydrolysis reaction, a condensation reaction, a chiral inversion reaction, a ring-opening addition reaction, a hydrogenation debenzylation reaction, salt forming and the like on raw materials consisting of a simple achiral compound and a cheap chiral aldehyde with only one chiral center. The process of the invention, which has the advantages of cheap and easily available raw material, mild reaction condition, and no pollution to environment, is suitable for the industrialization production.

The invention relates to a hyperspectral image detection system capable of simultaneously acquiring left-hand and right-hand circular polarization components of a target. The system includes a pre-positioned collimation system, a double-refraction beam splitting system, an imaging lens and an image acquisition and processing system that are sequentially arranged in the direction of incoming rays. According to the invention, a double-channel circular polarization detection system is adopted to simultaneously acquire an interference figure of the left-hand and right-hand circular polarization components of a target, the detection system improves the capability of acquiring a difference circular polarization spectral image as compared with the single-channel polarization imaging spectrometer only capable of detecting a single linear polarization component, avoids quiver noise as compared with the sequence acquisition technology adopting a rotary component, can be used for acquiring the circular polarization spectral image of the target within a wide band range from the ultraviolet band to the infrared band, and has potential application values in the fields of space exploration, earth remote sensing, machine vision, biomedical diagnosis and the like.

A measuring system for measuring the dichroism of the magneto-optical circular polarization with adjustable measuring geometry is provided, whose structure is that: a femtosecond laser excites the white light of the ultra-continuous spectrum, and divides the light by a monochrometer, which forms a monochromatic light whose wavelength can be adjustable. The monochromatic light can polarize through a purified Glan-Taylor prism with the extinction coefficient of 10 <5>; a lantern fly modulator, whose optical axis is 45degree angled with the optical axis of the Glan-Taylor prism to make the light become the circularly polarized light with the alternative variation of the sinistrality and the dextrorotation; a sample, which is put on the center of the cryogenic magnet; The circularly polarized light focuses on the sample, and the reflex reflected from the sample is focuses on the first LED detector; a phase-locking amplifier, whose reference signal is provided by the lantern fly modulator used for testing the difference of light intensity between the sinistrality and the dextrorotation of the circularly polarized light. The invention can not only test the frequency spectrum of the dichroism of the magneto-optical circular polarization of the materials, magnetic density and temperature dependence, but also can test the magnetocrystalline anisotropy of the magnetic semiconductor.

A polarization converter and polarization conversion systems are provided. The polarization converter and polarization conversion systems include a patterned polarization grating with left hand and right hand polarization grating domains. The polarization grating domains are configured to diffract incident non-polarized light into beams having left and right circular polarization states.

The invention relates to a self-centering four-jaw chuck, which comprises a chuck body, a group of clamping jaws consisting of four clamping jaws, and lead screws corresponding to the clamping jaws one by one, wherein bonded blocks at the front end of a positioning shaft on the chuck body are slidably connected with annular spacing grooves of the lead screws. The self-centering four-jaw chuck is characterized in that two opposite lead screws of the lead screws are set to be an integrated single lead screw; threads at both ends of the single lead screw are set to be levorotatory and dextrorotary respectively; and threads on the clamping jaws and the correspondingly meshed lead screws are set to be levorotatory and dextrorotary. The self-centering four-jaw chuck has the advantages that the self-centering four-jaw chuck is modified on the basis of the prior chuck structure, has a simple structure, can clamp various parts with different shapes, has independent and single two jaws, and realizes free centering and fine adjustment; the self-centering function of the two opposite jaws can be realized by adjusting the single integrated lead screw; asymmetric workpieces can be clamped as long as the eccentric distance of the asymmetric workpieces and the screw pitch of the lead screws are multiple proportional, so that automatic centering is realized; and the work efficiency can be improved by 30 percent during processing.

A self-centering chuck is provided for accurately fixing the position of workpieces on tables. The chuck has a basic body with guide grooves, a threaded spindle with right-handed and left-handed external threads and a centrally arranged groove, two slides screwed onto an external thread each with a clamping jaw each in the head area and with sliding blocks in the foot area. The slides are guided axially in the guide grooves and on the threaded spindle. The threaded spindle is centered in a central piece and can be fixed and locked on the basic body and on the central piece by fastening means guided in the groove. The clamping jaws arranged on the head side on the slides have clamping surfaces on both sides and can be used on both sides. The slides can be screwed on both sides onto left-handed and right-handed external threads of the threaded spindle.

The invention belongs to the technical field of aerators and relates to a waterwheel-type aerator with a device for preventing hot air from being reflowed in a waterproof cover. A motor is vertically arranged and a cooling fan is arranged at the upper end of the motor; a fan cover is arranged outside the cooling fan; the waterproof cover is arranged outside the motor; a separation device for preventing the hot air of the motor from being upwards reflowed into the fan cover of the motor is arranged between the waterproof cover and the motor, so that the hot air formed by carrying out heat exchange on cooling air and a heat radiation fin is not reflowed back to the fan cover of the motor; the temperature of the motor is greatly reduced and the load is increased by utilizing a function that the size of a buckling-type impeller is adjustable, so that the aerator can work at a high frequency point. The waterwheel-type aerator manufactured by the buckling-type impeller utilizes leftward spire and rightward spire to form an impeller with blades which are staggered in a ladder shape to form a spiral shape, so that a water flow formed by a flow pushing effect is dispersed in a splay shape when the aerator works and the oxygenation effect is easy to express.

The invention provides a profile cutting machine which comprises a box type platform; a bracket and a power switch are arranged on the box type platform; the bracket is provided with a rack through a hinged shaft; a motor is arranged at the rear end of the rack; a shaft is arranged at the front end of the rack; a belt pulley is arranged at one end of the shaft; a grinding wheel seat board and a grinding wheel pressing board are arranged at the other end of the shaft; a grinding wheel disc is arranged between the grinding wheel seat board and the grinding wheel pressing plate; the belt pulley is connected with the motor by a belt; a clamp I and a clamp II are arranged on the box type platform, and are respectively meshed with a left-hand threaded and a right-hand thread on a screw. The profile cutting machine has the advantages that the length of a cantilever of the motor part at the front end is increased, and the two ends of the motor have enough force to ensure that the cutting machine cannot fall off automatically when being in non-work state, so that the unsafe factor of the operation is eliminated; the clamps of the clamping part are driven by the screw with the left-hand thread and the right-hand thread, and when the large-area profile is cut, the profile is guaranteed to be adjusted to an optimal cutting point to be fixed, so that the working efficiency is improved greatly.

The invention relates to a photovoltaic solar cell panel cleaning device and belongs to the field of photovoltaic power generation operation and maintenance. A multiple-row solar cell panel cleaning robot comprises a cleaning part arranged on the surface of a solar cell panel, a walking device arranged on the solar cell panel and a spanning device arranged on the side of the walking device. The walking-spanning device is characterized in that the walking-spanning device comprises a left spanning wheel set unit and a right spanning wheel set unit, the left spanning wheel set unit and the right spanning wheel set unit are arranged on the left side and the right side of the walking device, a motor is arranged between the left spanning wheel set unit and the right spanning wheel set unit and is connected with a T-shaped reverser through a coupling, and two output shafts of the T-shaped reverser in the horizontal direction respectively output rotation speeds consistent in rotation direction and respectively drive a leftward-screwed ball screw and a rightward-screwed ball screw which are connected to rotate so as to drive sliding block connecting plates arranged on the ball screws to perform reciprocating motion and achieve simultaneous extension of the left spanning wheel set unit and the right spanning wheel set unit respectively connected with the sliding block connecting plates.

A biodegradable polyester microparticle or microsphere for controlling the release of medicine is prepared from levo-and dextro-cubic polyblock polylactide through cooling method, solvent voltilizing method, or non-solvent depositing method.