Abstract: Embodiments provide a foldable chair frame, it includes an intermediate connecting device including a main body, a block, a first rotating piece and a second rotating piece, the block being provided in an inner cavity of the main body and capable to slide up and down along the inner cavity, the first rotating piece and the second rotating piece being pivoted in an opening groove of the main body and capable to rotate around a pivot point; a plurality of leg tubes pivoted to a periphery of the intermediate connecting device through the first rotating piece; a plurality of front seat tubes and backrest tubes pivoted to the periphery of the intermediate connecting device through the second rotating piece. The present disclosure connects each tube to the intermediate connecting device to make the foldable chair more stable.

Abstract: Embodiments provide a foldable chair frame, it includes an intermediate connecting device including a main body, a block, a first rotating piece and a second rotating piece, the block being provided in an inner cavity of the main body and capable to slide up and down along the inner cavity, the first rotating piece and the second rotating piece being pivoted in an opening groove of the main body and capable to rotate around a pivot point; a plurality of leg tubes pivoted to a periphery of the intermediate connecting device through the first rotating piece; a plurality of front seat tubes and backrest tubes pivoted to the periphery of the intermediate connecting device through the second rotating piece. The present disclosure connects each tube to the intermediate connecting device to make the foldable chair more stable.

Abstract: An upgraded quay crane system and an operation process, wherein a conventional quay crane girder is upgraded into a double-trapezoid four-track girder (1). An upper trolley (2) travels on upper trolley running tracks (a16) on an inner side of the double-trapezoid four-track girder (1), a lower trolley (3) is suspended upside down on lower trolley running tracks (a8) on an outer side of the double-trapezoid four-track girder (1), and a container (5) hoisted by the upper trolley (2) via a hoist (4) is able to pass through the lower trolley (3). The present quay crane system improves on the conventional quay crane having a single operation trolley by adding one more operation trolley on the outer side of the original quay crane girder. The two trolleys are vertically disposed, and the space structure for the lower trolley is cleverly designed, such that the two trolleys can operate independently without interfering with each other.

Abstract: The invention is a novel lower-trolley system, comprising a lower trolley (3), a lower-trolley hoisting system, and a lower-trolley travelling system. The lower trolley (3), the lower-trolley hoisting system and the lower-trolley travelling system are all arranged on a quay crane; the lower-trolley hoisting system drives a hoist (14) of the lower trolley (3) to rise and fall, and the lower-trolley travelling system pulls the lower trolley (3) to make same travel in the direction of a double-trapezoid four-track girder (1) of the quay crane; and the lower trolley (3) is hung upside down on outer-side tracks (15) of the double-trapezoid four-track girder (1), and a container (12) hoisted by an upper trolley (2) can pass through the lower trolley (3).

Abstract: A high electron mobility transistor (HEMT) device is provided. The HEMT device includes a substrate layer, a buffer layer, a barrier layer, and a metallic electrode layer sequentially arranged in that order from bottom to top. The metallic electrode layer includes a source electrode, a gate electrode and a drain electrode sequentially arranged in that order from left to right. The barrier layer may include m number of fluorine-doped regions arranged in sequence, where m is a positive integer and m?2. The HEMT device can realize a relative stability of transconductance in a large range of a gate-source-bias through mutual compensation of transconductances in the fluorine-doped regions with different fluorine-ion concentrations of the barrier layer under the gate electrode, and the HEMT device has a good linearity without the need of excessive adjustments of material structure and device.

Abstract: A folding bedstead and a folding bed comprising same. The folding bedstead comprises a bed surface support frame and a support leg frame. The bed surface support frame comprises intermediate connecting pieces and support units symmetrically arranged at two ends of the intermediate connecting pieces. Each support unit comprises straight connecting tubes pivoted to the intermediate connecting pieces and a U-shaped bed frame tube pivoted at outer ends of the straight connecting tubes. The bed surface support frame is a closed planar frame in an unfolded state. The leg support frame comprises an intermediate leg frame, lateral leg frames, and outer leg frames, wherein the intermediate leg frame is arranged on the intermediate connecting pieces, the lateral leg frames are arranged on the straight connecting tubes in a folding manner, and the outer leg frames are arranged on the U-shaped bed frame tubes in a folding manner.

Abstract: A folding bedstead and a folding bed comprising same. The folding bedstead comprises a bed surface support frame and a support leg frame. The bed surface support frame comprises intermediate connecting pieces and support units symmetrically arranged at two ends of the intermediate connecting pieces. Each support unit comprises straight connecting tubes pivoted to the intermediate connecting pieces and a U-shaped bed frame tube pivoted at outer ends of the straight connecting tubes. The bed surface support frame is a closed planar frame in an unfolded state. The leg support frame comprises an intermediate leg frame, lateral leg frames, and outer leg frames, wherein the intermediate leg frame is arranged on the intermediate connecting pieces, the lateral leg frames are arranged on the straight connecting tubes in a folding manner, and the outer leg frames are arranged on the U-shaped bed frame tubes in a folding manner.

Abstract: A foldable handcart comprises a handcart frame comprising a bottom frame, a front frame, a rear frame and side frames. The bottom frame comprises two longitudinal beams and a supporting beam arranged in-between. Each longitudinal beam has two ends separately pivoted to the front and rear frames and comprises a front longitudinal beam part and a rear longitudinal beam part, which are pivoted to two ends of a longitudinal beam limiting part and can be folded downwards or be limited upwards to form the linear longitudinal beam. Each side frame comprises two first oblique beams having first ends pivoted together and second ends separately pivoted to the front and rear frames. In the unfolded state, each front longitudinal beam part and the corresponding rear longitudinal beam part form one linear longitudinal beam and form a triangular supporting structure together with the two first oblique beams of the corresponding side frame.

Abstract: A folding chair having a side table, including a folding chair frame and a folding table frame that is foldably linked with the folding chair frame, a plurality of support connectors are provided on the upper end of the folding table frame, and the plurality of support connectors are in the same horizontal plane to support tabletop when the folding table frame is in an unfolded state. The independent folding chair frame and folding table frame are provided. A plurality of support connectors is provided on the upper end of the folding table frame so as to place tabletop. It is implemented by providing the side table and chair frame independently. The side table is provided with a relatively large size, which has relatively more items being placed. The folding chair frame and the folding table frame are formed in a folding linkage to achieve unified folding.

Abstract: The present disclosure provides a method for characterizing ohmic contact electrode performance of a semiconductor device. The method comprises: preparing two sets of testing patterns on a semiconductor device; testing resistance values of the two sets of testing patterns respectively; calculating a sheet resistance of an ohmic contact area according to the obtained resistance values; and evaluating the ohmic contact electrode performance of the semiconductor device according to the sheet resistance of the ohmic contact electrode.

Abstract: A multifunctional grandstand chair includes a chair frame, a cushion movably arranged on the chair frame, and backrest cloth. The chair frame includes a base frame, a backrest tube and two foot supports, which are respectively pivoted to two sides of the base frame and capable of being inwards folded onto the base frame or outwards unfolded to support the base frame. The multifunctional grandstand chair further includes fixed connecting pieces connected between the base frame and the foot supports to limit the maximum unfolding angle of the foot supports. When the multifunctional grandstand chair needs to be transformed into a grandstand chair structure, the foot supports are folded onto the base frame. When the multifunctional grandstand chair needs to be transformed into a common chair, the foot supports are unfolded to be supported on the ground.

Abstract: A foldable handcart comprises a handcart frame comprising a bottom frame, a front frame, a rear frame and side frames. The bottom frame comprises two longitudinal beams and a supporting beam arranged in-between. Each longitudinal beam has two ends separately pivoted to the front and rear frames and comprises a front longitudinal beam part and a rear longitudinal beam part, which are pivoted to two ends of a longitudinal beam limiting part and can be folded downwards or be limited upwards to form the linear longitudinal beam. Each side frame comprises two first oblique beams having first ends pivoted together and second ends separately pivoted to the front and rear frames. In the unfolded state, each front longitudinal beam part and the corresponding rear longitudinal beam part form one linear longitudinal beam and form a triangular supporting structure together with the two first oblique beams of the corresponding side frame.

Abstract: A folding chair comprises a seat frame, a front leg bracket and a rear leg bracket, wherein the seat frame comprises at least two support tubes, and the front leg bracket and the rear leg bracket are articulated crosswise to form a foldable support structure. The rear leg bracket and the front leg bracket each have two upper ends corresponding to the two support tubes. The two upper ends of the rear leg bracket are pivoted to the two support tubes respectively. The two upper ends of the front leg bracket are slidably connected to the two support tubes respectively, are limited to first positions of the two support tubes when the foldable support structure is in an unfolded state, and to slide along the two support tubes away from the upper ends of the rear leg bracket when the foldable support structure in the unfolded state is gradually folded.

Abstract: A multifunctional grandstand chair includes a chair frame, a cushion movably arranged on the chair frame, and backrest cloth. The chair frame includes a base frame, a backrest tube and two foot supports, which are respectively pivoted to two sides of the base frame and capable of being inwards folded onto the base frame or outwards unfolded to support the base frame. The multifunctional grandstand chair further includes fixed connecting pieces connected between the base frame and the foot supports to limit the maximum unfolding angle of the foot supports. When the multifunctional grandstand chair needs to be transformed into a grandstand chair structure, the foot supports are folded onto the base frame. When the multifunctional grandstand chair needs to be transformed into a common chair, the foot supports are unfolded to be supported on the ground.

Abstract: A collapsible butterfly chair comprises a support frame and a chair cover. The support frame comprises two first side support rods, two second side support rods, two front crossed rods hinged together in crossed mode, two rear crossed rods hinged together in a crossed mode, and two support rods. The first side support rods and the second side support rods are hinged together in a crossed mode and separately arranged on two opposite side vertical faces. Two sliding sleeves are slidably arranged on the two first side support rods in a sleeving mode separately. The lower ends of the support rods are hinged to the sliding sleeves. The upper ends of the support rods are hinged to the upper ends of the second side support rods.

Abstract: A collapsible butterfly chair comprises a support frame and a chair cover. The support frame comprises two first side support rods, two second side support rods, two front crossed rods hinged together in crossed mode, two rear crossed rods hinged together in a crossed mode, and two support rods. The first side support rods and the second side support rods are hinged together in a crossed mode and separately arranged on two opposite side vertical faces. Two sliding sleeves are slidably arranged on the two first side support rods in a sleeving mode separately. The lower ends of the support rods are hinged to the sliding sleeves. The upper ends of the support rods are hinged to the upper ends of the second side support rods.

Abstract: The present disclosure provides a method for characterizing ohmic contact electrode performance of a semiconductor device. The method comprises: preparing two sets of testing patterns on a semiconductor device; testing resistance values of the two sets of testing patterns respectively; calculating a sheet resistance of an ohmic contact area according to the obtained resistance values; and evaluating the ohmic contact electrode performance of the semiconductor device according to the sheet resistance of the ohmic contact electrode.

Abstract: The invention discloses a double folding chair with rotation angles. The double folding chair comprises four backrest pipes and two armrest pipes, wherein the a wrest pipes and the backrest pipes form a folding chair frame, rotation-angle transverse-bracing pipes are arranged between the two backrest pipes in the middle so that a flare angle can be formed between two chair backs, and intermediate connecting pieces which can rotate coaxially are arranged on a front support of the folding chair frame so as to be matched with the rotation-angle transverse-bracing pipes. Since the flare angle can be formed between two chair bodies, chair users can communicate conveniently, and the double folding chair has the advantages of being reasonable in structure, good in user experience etc.

Abstract: The invention discloses a strap-type folding chair comprising a backrest and a chair seat, wherein the backrest can be adjusted to be in a sitting state or a lying state relative to the chair seat and is provided with a back side, the back side is provided with a strap with an initial end and a final end, the strap penetrates through fixing belts at the top of the backrest, the initial end and the final end of the strap are connected to a chair frame respectively, and at least one end of the strap is connected with the chair frame through a release buckle. By combining the strap with the chair fixing points, the strap-type folding chair can be carried on the back in various forms and has the advantages of being reasonable in structure, high in adaptability, and the like.