32results about How to "Good attenuation" patented technology

A filter arrangement for use in a multiband dual-mode mobile phone. In particular, the mobile phone is operable in a W-CDMA mode and a band-reject filter comprising at least a series and a shunt acoustic-wave resonators is used to create a deep notch at the receive frequency band. The band-reject filter further includes a plurality of inductive elements for matching static capacitance of the resonators at the passband frequency. The mobile phone is also operable in 1800 and 1900 GSM bands. The band-reject filter is operatively connected to a harmonic trap in order to eliminate the third harmonic of these GSM bands. The mobile phone is also operable in the lower GSM band, for which a harmonic filter can share an antenna path with the band-reject filter.

The invention provides an air buffer device used for eliminating underwater near-distance explosion shock waves. The air buffer device comprises a counterweight, a gas ejector pipe, a maze type bubble channel and a flexible gasbag, wherein both the lower end and the upper end of the maze type bubble channel are open; the lower end of the maze type bubble channel is fixedly arranged on the gas ejector pipe, and the upper portion of the maze type bubble channel is connected with the flexible gasbag; the gas ejector pipe is connected with the counterweight; a gas ejecting hole of the gas ejector pipe is positioned inside the maze type bubble channel; and floating force, generated in water, of the flexible gasbag is greater than gravity, borne in water, of the maze type bubble channel. According to the air buffer device provided by the invention, air buffers which are staggered front and rear are formed in the vertical direction, and sudden change of wave impedance between an air medium and a surrounding water medium is utilized, so that a pressure peak value of shock waves can be attenuated by 90% or more, and therefore, safety of nearby hydraulic structures and other protected targets is protected, and the air buffer device has the advantages of being good in energy dissipation effect, energy-saving, environmentally friendly, and the like.

The invention provides an underwater blasting impact wave protection device which can effectively protect a target against damage of underwater blasting impact waves. The underwater blasting impact wave protection device is characterized by comprising a bamboo raft isolating layer, a plurality of connecting pieces and a plurality of additional weights; bamboo poles with the water content higher than 40% are bundled to be in a stacked bamboo raft shape, in the same row, vertical bamboo joints of adjacent bamboo poles are staggered, and the bamboo poles in adjacent rows are staggered; the upperends of the connecting pieces are fixed to the bottom of the bamboo raft isolating layer; and the additional weights are installed at the lower ends of the multiple connecting pieces, the total gravity is larger than buoyancy of the bamboo raft isolating layer in water, and bamboo barrels in the bamboo poles are not cracked.

The invention relates to an entogastric lingering floating slow-release tablet for treating the malignant tumor of the gastrointestinal tract, which contains three active components: tegafur, gimeracil and oteracil potassium; the entogastric lingering floating slow-release tablet also contains a hydrophilic gel skeleton material, a medicine release regulation material, a foaming agent, a floating aid, a diluting agent and a lubricant; and the mole ratio of the three active components of the tegafur to the gimeracil to the oteracil potassium is 1:0.2-8:0.2-8, and the three active components account for 25-50% according to the weight percent of the tablet. The preparation can quickly float after oral administration and float above the gastric juice for a long time, and the medicines are stably, slowly and durably released, thereby generating a permanent killing function to the malignant tumor of the gastrointestinal tract. The preparation is a dosage form with the characteristics of high bioavailability, low toxic or side effect, targeting and slow release. The preparation can be applied to a patient suffering from the malignant tumor of the gastrointestinal tract.

The invention provides Salmonella typimurium S496. The Salmonella typimurium S496 is characterized by lacking an rfbB gene and an rffG gene; a pagL gene is replaced by an arabinose-regulatory-sequence-containing rfbB gene with a changed SD sequence and a changed initiation codon, and the nucleotide sequence of the arabinose-regulatory-sequence-containing rfbB gene with the changed SD sequence and the changed initiation codon is shown as SEQ ID No.1; the classification of the attenuation strain is named as the Salmonella typimurium S496, the Salmonella typimurium S496 is collected in the China Center For Type Culture Collection (CCTCC), the collection number is CCTCC M2015562, and the collection time is September 21st, 2015. The invention further provides a method for constructing the Salmonella typimurium S496. Meanwhile, the invention provides an application of the strain or the attenuation strain constructed with the construction method in vaccine.

The invention relates to the technical field of dust concentration measurement, and particularly discloses an optical-fiber dust concentration measurement apparatus. The optical-fiber dust concentration measurement apparatus successively comprises a light source part, an input optical fiber, a measurement part, an output optical fiber, a signal conversion part and a data processing part. The measurement part comprises a beam splitter, a first measurement area consisting of a first transmitting end, a first attenuation area, a first receiving end and a first connecting rod, and a second measurement area consisting of a second transmitting end, a second attenuation area, a second receiving end and a second connecting rod. Laser is divided by the beam splitter into a first optical path and a second optical path and then enters the first measurement area and the second measurement area to be measured, and after the measurement, an optical signal is outputted by virtue of the output optical fiber to the signal conversion part to be converted into an electric signal, and the data processing part calculates a laser attenuation coefficient by virtue of the received electric signal. By utilizing the dual-optical-path measurement and differential operation method, a measurement error is eliminated, and the measurement precision is improved.

The invention provides a toxicity-reducing processing technology of traditional Chinese medicine decoction pieces. The traditional Chinese medicine decoction pieces are semen strychni, the toxicity-reducing processing technology includes the following steps that (1) soaking, raw semen strychni is successively soaked by an alkali solution and an acid solution, outer skin of the semen strychni is removed after the semen strychni is soaked by clean water; (2) slicing, the semen strychni after outer skin of the semen strychni is removed is sliced, dried, mixed with sand, and buried through sand bags; (3) semen strychni slices buried through the sand bags are put into a muffle furnace for heating; and (4) heated materials are taken out for cooling to an indoor temperature, the semen strychni slices are taken out, washed by the clean water, and dried for standby using. According to the toxicity-reducing processing technology, the semen strychni is heated more evenly in the process of heating, changing of inner structure is more conducive to transmission and diffusion of heat in the interior part, and thus the direct contact area between heat and toxic substances is enlarged, direct transformation of the toxic substances is facilitated, and the detoxification effect of the semen strychni is further improved, and therefore, an important role in further improving the application value of the semen strychni is played.

The invention provides a built-in permanent magnet driving motor of an electric automobile and an electromagnetic vibration weakening method thereof. The built-in permanent magnet driving motor comprises a permanent magnet rotor which is disposed in a stator in a sleeving manner and is coaxially arranged with the stator, and an armature winding is arranged on the stator; the permanent magnet rotorcomprises a rotor core and permanent magnets, a rotor groove is formed in the rotor iron core, a permanent magnet is placed in the rotor groove, 2p rotor magnetic poles are formed on the rotor iron core by the permanent magnet, the pole arc width corresponding to one rotor magnetic pole in the rotor magnetic poles is different from the pole arc widths corresponding to other 2p-1 rotor magnetic poles, and the pole arc widths of the other 2p-1 rotor magnetic poles are the same; and magnetic flux on the permanent magnet rotor enters the stator along an air gap between the stator and the permanent magnet rotor, formed main magnetic flux acts with a magnetic field generated by an armature winding on the stator, and the motor generates torque. Through the novel rotor magnetic pole segmentationmethod, the cogging torque, the tooth harmonic electromotive force and the torque pulsation of the built-in permanent magnet motor can be greatly weakened, so that the electromagnetic vibration of thebuilt-in permanent magnet motor is effectively weakened.

The invention provides an underwater blasting impact wave protection device which can effectively protect a target against damage of underwater blasting impact waves. The underwater blasting impact wave protection device is characterized by comprising a bamboo raft isolating layer, a plurality of connecting pieces and a plurality of additional weights; bamboo poles with the water content higher than 40% are bundled to be in a stacked bamboo raft shape, in the same row, vertical bamboo joints of adjacent bamboo poles are staggered, and the bamboo poles in adjacent rows are staggered; the upperends of the connecting pieces are fixed to the bottom of the bamboo raft isolating layer; and the additional weights are installed at the lower ends of the multiple connecting pieces, the total gravity is larger than buoyancy of the bamboo raft isolating layer in water, and bamboo barrels in the bamboo poles are not cracked.

The invention provides attenuated salmonella choleraesuis (S.Cholerasuis S1209). The attenuated salmonella choleraesuis is characterized by deleting a wzx gene, having the class name of S.Cholerasuis S1209, and being collected in China Center for Type Culture Collection on October 22, 2015, with the collection number of CCTCC M 2015631. The invention further provides a preparation method of the attenuated salmonella choleraesuis (S.Cholerasuis S1209) and application thereof to vaccines.

The invention discloses a photosensitive polypropylene material and a preparation method thereof. Novel photosensitive functional polypropylene is added into the polypropylene material, azo groups contained in the polypropylene material can generate conformational change under specific illumination, the azo groups are matched with polar groups to well weaken the bonding strength of dirt on the surface of polypropylene, so that polypropylene is easy to clean. In addition, a lubricant and an anti-static agent added into the photosensitive easy-to-clean polypropylene material also have a remarkable effect on dirt and dust adsorbed by static electricity, so that the polypropylene material is easier to clean. The preparation method provided by the invention has the advantages of simple and easily available raw materials, few reaction steps, low process condition requirements, high reaction yield and low cost, and can be used for large-scale industrial production.

The invention discloses an unequal tooth width combined permanent magnet synchronous motor and an electromagnetic vibration weakening method thereof. The unequal tooth width combined permanent magnetsynchronous motor comprises a stator, a permanent magnet rotor and armature windings, the stator sleeves the permanent magnet rotor, and the permanent magnet rotor is coaxially arranged with the stator. The stator comprises stator slots, stator teeth and a stator yoke part, the stator yoke part is annular, the stator teeth are uniformly distributed along the circumference of the stator yoke part.The stator slots are arranged between the stator teeth, and the armature windings are arranged in the stator slots. The width of at least one stator tooth in the stator teeth is different from the widths of other stator teeth, and the widths of other stator teeth are the same. According to the invention, the cogging torque and the tooth harmonic electromotive force of the permanent magnet motor are greatly reduced by adopting the stator with the unequal tooth width combined structure, so that the motor can have smaller torque pulsation; the torque ripple weakening effect equivalent to that ofa stator skewed slot can be achieved by changing the width of the motor stator tooth, and the torque ripple is weakened by replacing a stator skewed slot or rotor skewed pole method in the industry.

The invention relates to a preparation method and use of a tripterine-chitosan oligosaccharide coupled drug. The preparation method can effectively solve problems of large toxic and side effects, poor water solubility and a short biological half-life period of tripterine. A technical scheme to be solved is as follows: the tripterine-chitosan oligosaccharide coupled drug has a structural formula as follows, wherein, a molecular weight of chitosan oligosaccharide (CSO) is 320-3,200 Da, the acetyl content z is 0.1-0.8 (%), and x+y+z is 1-20. The preparation method has mild reaction conditions, strong controllability and high yield, water solubility of a final product is good, the prepared coupled drug has a good toxicity-reducing effect and the preparation method of the tripterine-chitosan oligosaccharide coupled drug is an innovation.

The invention relates to aeromonas veronii, which is preserved in China Center for Type Culture Collection (CCTCC) on July 24th, 2019, and a preservation number of the aeromonas veronii is CCTCC NO: M2019580. The virulence of the aeromonas veronii mutant strain is greatly reduced, a good attenuating effect is achieved, and possibility is provided for preparing aeromonas veronii attenuated live vaccines.

The invention belongs to the technical field of manufacturing of ignition and boosting apparatuses. A polyhedral energy-accumulating metal blasting fuse comprises an inner flux core and a circular-tube metal outer layer coated outside, wherein the metal outer layer is provided with one or more groove structures; the cross section of each groove has a circular-arc structure or an angular structure or a stepped structure or other structures of irregular shapes; the depth of each groove is smaller than or equal to a half of the outer diameter of the metal blasting fuse; and the length of each groove is larger than that of a superposed part between two laterally parallel metal blasting fuses. A method for laterally boosting by using the polyhedral energy-accumulating metal blasting fuse comprises the following steps of: arranging the cylindrical surface of a boosted metal blasted fuse in the groove surface of a metal blasting fuse playing a role in boosting; and binding with an adhesive tape and a leg wire, wherein the length of a superposed part between the adhesive tape and the leg wire is more than 1 centimeter. The polyhedral energy-accumulating metal blasting fuse can be directly subjected to lateral parallel boosting without any auxiliary component, has the advantages of reliable ignition, easiness, convenience and rapidness for connection and no need of accessories, and is suitable for lateral direct parallel connection of blasting fuses of different sizes and different explosive charging densities.

The invention provides a method and system for generating combination of different pole-arc coefficients of magnetic poles for weakening inherent shaft voltage. The method comprises the following steps: acquiring pole slot matching data of a built-in permanent magnet synchronous motor; obtaining a Fourier expansion of the magnetomotive force according to the distribution of the magnetomotive force along the circumference of the air gap under different pole arc coefficient combinations of the magnetic poles; obtaining a magnetomotive force Fourier decomposition coefficient related to a natural axis voltage fundamental wave according to the obtained pole slot matching data and a magnetomotive force Fourier expansion; and taking the Fourier decomposition coefficient value of the magnetomotive force as zero as a target to obtain a pole-arc coefficient combination capable of weakening the intrinsic axis voltage. The method and system are applied to the built-in permanent magnet synchronous motor, the inherent shaft voltage of the built-in permanent magnet synchronous motor is weakened, and the operation reliability of a motor system is improved.

The invention relates to a high polymer gravel protection device for eliminating underwater near-field blasting shock waves. The device comprises a high polymer, wire meshes, gravel and steel plates, the gravel is filled between the wire meshes to form a protection body, then the high polymer is poured to form a protection mechanism, the steel plates are pre-buried on both sides of the protection mechanism, lifting lugs are formed at the two ends of the steel plate extending out of the protection mechanism, and lifting holes are formed in the lifting lugs. The sudden change of wave impedance between a high polymer gravel protection mechanism and a surrounding water medium and sealed bubble diffuse reflection shock waves on the irregular surface of the gravel and in a high polymer material are utilized, the shock wave impulse and total energy are well weakened, the gravel is fixed through the wire meshes, the plastic deformation capacity of the protection mechanism is improved, the protection mechanism is not broken and falls off in the shock wave action process is ensured, the effective action time in the shock wave protection process is prolonged, so that hydraulic structures and other protected targets in an adjacent water area are protected from being damaged by underwater blasting shock waves.

The present invention provides a rotor pole segmented permanent magnet synchronous motor and its electromagnetic vibration weakening method, comprising a stator, a permanent magnet rotor and an armature winding, the permanent magnet rotor includes a rotor core and a permanent magnet, wherein the permanent The magnetic rotor is set inside the stator and arranged coaxially with the stator. The armature winding is arranged on the stator; the permanent magnet rotor is divided into two sections along the axial direction. For installation, 2p permanent magnets are placed on the surface of each section of the rotor, where p is the number of pole pairs of the motor. Among the permanent magnets, the pole arc width corresponding to one permanent magnet is different from the pole arc width corresponding to other permanent magnets. The other 2p‑1 permanent magnets have the same polar arc width. The invention can realize the suppression of the torque ripple and electromagnetic vibration of the surface-mounted permanent magnet motor under the condition of the non-inclined chute, and has low input cost.

The present disclosure discloses a method for weakening the electromagnetic vibration of a permanent magnet drive motor of an electric vehicle, which includes setting stator slots between the stator teeth, and armature windings are placed in the stator slots; there is at least one stator slot width in the stator slots The width of other stator slots is different from that of other stator slots, and the width of other stator slots is the same; the stator slot adopts a straight slot structure, the total slot width and pitch ratio of the motor remain unchanged, and the total slot area of ​​​​the motor remains unchanged; it has different widths The circumferential angle of the stator slot and the circumferential angle of other stator slots with the same width are given by K t OK, and change K t value such that G n = 0; G n is the influence of stator slot distribution on cogging torque, K t is the ratio of the width of other stator slots with the same width to the width of a stator slot with a different width. By changing the width of the stator slot of the motor, the torque ripple weakening effect equivalent to that of the stator skew can be achieved, which can replace the stator skew or rotor skew in the industry to weaken the torque ripple.

The invention provides an air buffer device used for eliminating underwater near-distance explosion shock waves. The air buffer device comprises a counterweight, a gas ejector pipe, a maze type bubble channel and a flexible gasbag, wherein both the lower end and the upper end of the maze type bubble channel are open; the lower end of the maze type bubble channel is fixedly arranged on the gas ejector pipe, and the upper portion of the maze type bubble channel is connected with the flexible gasbag; the gas ejector pipe is connected with the counterweight; a gas ejecting hole of the gas ejector pipe is positioned inside the maze type bubble channel; and floating force, generated in water, of the flexible gasbag is greater than gravity, borne in water, of the maze type bubble channel. According to the air buffer device provided by the invention, air buffers which are staggered front and rear are formed in the vertical direction, and sudden change of wave impedance between an air medium and a surrounding water medium is utilized, so that a pressure peak value of shock waves can be attenuated by 90% or more, and therefore, safety of nearby hydraulic structures and other protected targets is protected, and the air buffer device has the advantages of being good in energy dissipation effect, energy-saving, environmentally friendly, and the like.

The invention discloses a smoked membrane structure. The smoked membrane structure comprises transparent base materials and a PVA (polyvinyl acetate) layer covering the inner sides of the transparentbase materials, wherein the transparent base materials are membranes made of a high-transparency material. The non-polarized light passing rate of PVA arranged on the smoked membrane structure is 50%,and the polarized light passing rate of PVA as high as about 85%. Therefore, the attractive effect of integral black can be realized when light sources such as a TFT (thin film transistor) screen andthe like are switched off; when the light sources are switched on, the smoked membrane structure does not have obvious attenuation effect on polarized light emitted from the light sources, extra-loadadded to the light sources such as the TFT screen and the like is smaller, high probability of damage caused by long-term high-load and even over-load operation of the light sources such as the TFT screen and the like can be avoided better, and the service life of the light sources is relatively prolonged; besides, because of no need of high-load operation, electric power is saved, and the lightsources are more environmentally friendly.

The disclosure discloses a permanent magnet synchronous motor with unequal tooth width combination and its electromagnetic vibration weakening method, a stator, a permanent magnet rotor and an armature winding. The permanent magnet rotor is sleeved inside the stator and arranged coaxially with the stator; The stator includes stator slots, stator teeth and a stator yoke, the stator yoke is annular, the stator teeth are evenly distributed along the circumference of the stator yoke, stator slots are arranged between the stator teeth, and the stator slots are placed Armature winding; among the stator teeth, at least one stator tooth has a width different from that of other stator teeth, and the other stator teeth have the same width. The present disclosure greatly reduces the cogging torque and tooth harmonic electromotive force of the permanent magnet motor by adopting the stator with unequal tooth width combination structure, so that the motor can have smaller torque ripple; by changing the width of the stator teeth of the motor, that is The torque ripple weakening effect equivalent to that of the stator skew can be achieved, and the torque ripple can be weakened by replacing the stator skew or rotor skew in the industry.

The invention provides attenuated salmonella choleraesuis (S.Cholerasuis S1209). The attenuated salmonella choleraesuis is characterized by deleting a wzx gene, having the class name of S.Cholerasuis S1209, and being collected in China Center for Type Culture Collection on October 22, 2015, with the collection number of CCTCC M 2015631. The invention further provides a preparation method of the attenuated salmonella choleraesuis (S.Cholerasuis S1209) and application thereof to vaccines.

The present invention provides an attenuated strain of Salmonella typhimurium S496, characterized in that the attenuated Salmonella typhimurium S496 is deleted from its own rfbB gene and rffG gene; the pagL gene is replaced by a change containing the arabinose regulatory sequence The rfbB gene with the SD sequence and the start codon changed, the nucleotide sequence of the rfbB gene with the SD sequence and the start codon changed as shown in SEQ ID No.1 containing the arabinose regulatory sequence; the attenuated The classification of the strain is named Salmonella typimurium S496, and it is preserved in the China Center for Type Culture Collection, with the preservation number CCTCC M 2015562, and the preservation time is September 21, 2015. The invention also provides a construction method of the attenuated Salmonella typhimurium. The present invention also provides the application of the above-mentioned bacterial strain or the attenuated bacterial strain constructed by the above-mentioned construction method in vaccines.

The invention provides a strain of attenuated salmonella choleraesuis (S. Choleraesuis S1210) which is characterized in that the attenuated salmonella choleraesuis (S. Choleraesuis S1210) is lack of a wbaD gene, is classified and named as S. Choleraesuis S1210, and is preserved in the China center for type culture collection, wherein the preservation number is CCTCC M 2015632, and the preservation time is October 22, 2015. The invention further provides a method for preparing the attenuated salmonella choleraesuis (S. Choleraesuis S1210) and application of the attenuated salmonella choleraesuis (S. Choleraesuis S1210) to vaccine.

The present invention relates to Aeromonas victorii, which was preserved in the China Center for Type Culture Collection, referred to as CCTCC, on July 24, 2019, and the preservation number is CCTCC NO: M 2019580. The virulence of the mutant strain of Vernerundii of the present application is greatly reduced, and a good attenuation effect is achieved, which provides a possibility for making a live attenuated vaccine of Aeromonas vernerii.

The invention discloses an electromagnetic vibration weakening method for a permanent magnet driving motor of an electric automobile. The method comprises: stator grooves are disposed between stator teeth, and armature windings are disposed in the stator grooves; the width of at least one stator slot in the stator slots is different from the widths of other stator slots, and the widths of other stator slots are the same; the stator slots adopt straight slot structures, the ratio of the total slot width to the pitch of the motor is kept unchanged, and the total slot area of the motor is kept unchanged; the circumferential angles of the stator slots with different widths and the circumferential angles of the other stator slots with the same width are determined by Kt, and the value of Kt ischanged to enable Gn to be equal to 0; and Gn is the influence of the distribution of the stator slots on the cogging torque, and Kt is the ratio of the widths of other stator slots with the same width to the widths of stator slots with different widths. The torque ripple weakening effect equivalent to that of a stator skewed slot can be achieved by changing the width of a motor stator slot, and the torque ripple weakening effect can be achieved by replacing a stator skewed slot or rotor skewed pole method in the industry.

The invention discloses an active and passive combined fixed-wing aircraft gust mitigation control method, which belongs to the technical field of aircraft control. First construct the two-dimensional coordinate system OZX, the wing is divided into the inner wing and the full-motion wingtip, discretize the wing in OZX, and list the vibration differential equations of the inner wing and the full-motion wingtip; through the aerodynamic coefficient matrix The aerodynamic force acting on the inner wing, and calculate the discrete gust; Substitute the model of aerodynamic force and gust into the vibration differential equation, eliminate the shear force and combine to obtain the dynamic equation of the whole machine in the form of a large matrix, and transform it into the aircraft gust response dynamics Equation; select the acceleration and displacement of the center of mass of the fixed-wing aircraft wing as the objective function of the optimal control design, calculate the deformation of the wing, and verify the efficiency of gust mitigation. The present invention reduces the required rudder deflection angle under the same gust strength and overload requirements, increases the efficiency of gust mitigation, and has a good weakening effect on the overload and deformation of the wing tip.

The invention discloses a permanent magnet synchronous motor with unevenly segmented rotor magnetic poles and an optimal setting method thereof. Including the rotor, stator and armature windings, the permanent magnets of the rotor are distributed axially symmetrically and divided into N sections, and the offset angles and stacking thicknesses of the permanent magnet rings in the axially asymmetric positions are different. The torque function sets the offset angle and stack thickness of each segment of the permanent magnet ring; the stator is provided with a plurality of stator slots, and is an iron core structure in which semi-closed slots and closed slots are mixed and stacked in proportion. The invention can not only obtain smaller cogging torque than the traditional segmented inclined pole, but also offset the axial unbalanced magnetic pull force by adopting the axially symmetrical structure, and reduce the noise and vibration of the motor. In this case, the overall performance of the motor is greatly improved.