62results about How to "Overcome adverse effects" patented technology

The present invention relates to a palladium-based supported hydrogenation catalyst and a preparation method and application thereof. The catalyst is prepared by the following method: impregnating an Al2O3-containing carrier with an organic solution containing a bipyridine derivative having hydroxy group, optionally drying followed by impregnating with a mixed solution containing the main active component palladium ions and the auxiliary active component Mn+ ions, where M is one selected from Ag, Au, Ni, Pb and Cu; and then optionally drying, and calcining to obtain the catalyst. The preparation method provided by the present invention allows Pd atoms and M atoms to be highly uniformly dispersed on the carrier, which overcomes the adverse impact of the surface tension of the impregnation solution and the solvation effect on the dispersibility of active components. The palladium-based supported hydrogenation catalyst provided by the present invention has excellent hydrogenation activity, ethylene selectivity and anti-coking performance, and can be used in a selective hydrogenation process of C2 fraction.

A rolling moulding method for preparing large plastic product features that the rotating and swinging 360 deg. apparatus and the special mould with flow-damping structure (semispherical bosses, spherical bosses or step bosses) are used. Its product features high thickness, uniformity and strength.

The invention discloses a film bulk acoustic wave resonator, comprising a growth substrate, a piezoelectric film, a top electrode and a bottom electrode, wherein the piezoelectric film is epitaxiallygrown on the growth substrate, the top electrode is prepared on an upper surface of the piezoelectric film, a lower guide hole is deeply etched on the growth substrate, and the lower guide hole penetrates through the growth substrate and the piezoelectric film; and a back surface of the growth substrate is etched to form a hollow cavity, and the bottom electrode is prepared on a lower surface of the growth substrate. The invention further provides a preparation method of the film bulk acoustic wave resonator. The film bulk acoustic wave resonator disclosed by the invention is simple in structure, is unlikely to collapse, can well improve the quality of the piezoelectric film, and will become a solution suitable for radio frequency filters in high frequency and high power occasions in the future.

The Raman laser with simple compact structure includes pump system of diode laser end face, laser cavity composed of coated laser input / output cavity mirrors, independent laser gain crystal placed in laser cavity, Raman frequency shift crystal and turning Q unit for laser. Output Raman laser is obtained from laser in quasi continuous operation. Laser gain crystal is Nd:YVO4 crystal, doping Nd3+ laser crystal or doping Yb3+:YAG etc. laser crystals, which generate laser oscillations with wavelengths near to 1.34 micro or 1.06 micro. Raman frequency shift crystal is prepared from one piece of single crystal as Raman active medium. Here, the Raman frequency shift crystal is undoped YVO4 crystal etc. in the invention, laser gain crystal and Raman frequency shift crystal are independent from each other so as to raise output power and beam quality of laser since heat effect does not occur.

The invention discloses a steel casing installation device and installation method at complex terrains. The steel casing installation device at the complex terrains comprises a guide frame and a vibrating sinking device. The guide frame comprises an inner frame body and an outer frame body which are nested from the inner side to the outer side. The cross sections of the inner frame body and the outer frame body are both of square shapes. Four corners of the top face and the bottom face of the inner frame body are fixed to the center points of the four edges of the top face and the bottom faceof the outer frame body correspondingly to form a triangular area in an enclosed manner. Each triangular area is internally provided with a positioning rod, one ends of the positioning rods are fixedto the corners of the outer frame body, the other ends of the positioning rods are provided with mechanical pressing mechanisms, and rod bodies of the positioning rods are perpendicular to and fixed to the edges of the inner frame body. The vibrating sinking device comprises a crane and a vibrating hammer arranged at the hanging end of the crane. According to the steel casing installation device and installation method at the complex terrains, a casing and the guide frame are arranged, the problem of penetrating through the complex terrains is effectively solved, the control precision of installation of the casing is further enhanced, adverse influences of the geological factor on installation of the casing are overcome, and the steel casing installation device is high in applicability andinstallation precision.

A suspension assembly of an axle / suspension system for a heavy-duty vehicle is mounted on the heavy-duty vehicle frame or sub-frame via a beam of the suspension assembly which is pivotally connected to a hanger connected to the vehicle frame. The pivotal connection includes the hanger, the beam, a bushing assembly and a fastener group, and a textured feature formed in at least one of at least a portion of the hanger, at least a portion of the bushing assembly, or at least a portion of the fastening means so that the textured feature inhibits relative movement of the bushing assembly with respect to the hanger.

A suspension assembly of an axle / suspension system for a heavy-duty vehicle is mounted on the heavy-duty vehicle frame or sub-frame via a beam of the suspension assembly which is pivotally connected to a hanger connected to the vehicle frame. The pivotal connection includes the hanger, the beam, a bushing assembly and a fastener group, and a textured feature formed in at least one of at least a portion of the hanger, at least a portion of the bushing assembly, or at least a portion of the fastening means so that the textured feature inhibits relative movement of the bushing assembly with respect to the hanger.

The invention relates to the electromotor, the stator iron core is mounted on the electromotor, the three phase symmetry winding is mounted on the stator iron core, the permanent magnet is fixed on the rotor iron core. The generator rotor of the invention is mounted with one loop slop locating on the half of the width. Two sides of the loop slop are mounted with the slop along the direction of the axis on the rotor, and these slops are collocated distantly along the sides of the loop slot, the slop along the axis is the adopting pole constructed by the rotor iron core soft iron. The permanent magnet are fixed on the slot along the axis, thereinto, each permanent magnet N poles located in the slot along the axis on the side of the loop slot point at the centre of the a circle of the rotor, and the S pole of each permanent magnets located on the other side of the loop slot point at the centre of the circle of the rotor, so the magnet direction formed is the magnetization along the axis.

The invention provides a method for improving the preparation yield of an FBAR filter and the FBAR filter. The method comprises the following steps: generating a piezoelectric film on a first substrate, and forming at least one first electrode; forming a support layer, etching the support layer to form a first support layer cavity, and forming a first bonding layer on one side of the support layer; forming at least one mark point on the second bonding layer on one side of the bonding substrate and forming a first through hole penetrating through the bonding substrate on the bonding substrate;bonding and connecting the first bonding layer and the second bonding layer, removing the first substrate, and forming a top electrode and an electrode up-leading structure connected with the first electrode on one side, far away from the first electrode, of the piezoelectric film, so as to form the FBAR filter. In the preparation process, a sacrificial layer is not required to be used, the integrity of the piezoelectric film is kept, and the structural design that the holes are formed in the bonding substrate is stable in structure and not easy to collapse, so that the quality of the piezoelectric film can be well improved.