Petraz, Gilberto Luigi

The present application provides a wall detection instrument, the wall detection instrument including: a housing, the housing being provided with a marking hole, the marking hole penetrating through opposite two sides of the housing; a distance measurement module, the distance measurement module being installed in the housing, the distance measurement module being configured to measure a distance from a target position to the wall detection instrument; and a detection module, the detection module being mounted in the housing and adjacent to the marking hole, the detection module being configured to detect a hidden object in a solid medium.

The present application discloses a seat frame and a seat unit. the seat frame includes a movable seat frame (100), the movable seat frame (100) includes a first side frame (110), a linkage mechanism (120), and an armrest member (130), the first side frame (110) includes a first longitudinal beam (111) and a main support member (112) connected to a lower end of the first longitudinal beam (111); the first longitudinal beam (111) is provided extending along a front-rear direction, the main support member (112) is configured to support on the ground; the linkage mechanism (120) is provided on a side of the first longitudinal beam (111) facing the linkage mechanism (120), and is configured to transform between a sitting position and a reclining position; the armrest member (130) is fixedly connected to a side of the first side frame (110) away from the linkage mechanism (120). In the present application, by the main support member (112) of the first side frame (110) supporting on the ground, the first longitudinal beam (111) being connected to the main support member (112) causes the first side frame (110) to provide a stable supporting effect on the linkage mechanism (120) and the armrest member (130), thereby replacing a design of using the armrest member (130) to support on the ground in traditional products, and further causing the overall seat frame to be more stable, effectively reducing occurrence of shaking, and further optimizing a consumer's user experience.

A modular multilevel converter (MMC) includes a phase leg (PL) including a upper arm (UA) and a lower arm (LA) connected in series, wherein the upper arm (UA) includes a plurality of arms (A1 to Am) connected in parallel, wherein one of the arms (A1 to Am) includes a chain link (CL) and an arm inductor (AI) connected in series, wherein the chain link (CL) includes a plurality of submodules (SM) connected in series, and wherein each submodule (SM) includes a half-bridge circuit (HB) or a full-bridge circuit (FB).

This disclosure relates to a power transformer (200). The power transformer (200) includes a first winding (210), a second winding (220), and a core structure (230). An isolating structure (26) provided with an insulating material or a semi-conductive material to separate the first winding (210) and the second winding (220) and to cover part of the core structure (230).

The present invention provides a polyamide composite material and an application thereof. The polyamide composite material includes, in parts by mass, the following components: 35-82 parts of a polyamide resin, 5-45 parts of a reinforcing material, and 5-25 parts of an organic phosphonate flame retardant. A water-soluble acid value of the organic phosphonate flame retardant is 0.1-0.3 mg KOH/g. According to the present invention, by adopting an organic phosphonate flame retardant with a low acid value, occurrence of dialkylphosphinic acid released during decomposition in a high-temperature process can be slowed down, so that the quantity of mold deposits produced by the polyamide composite material in an injection molding process is significantly reduced, thereby improving injection molding production efficiency. Meanwhile, the polyamide composite material has a significantly reduced content of water-boiling precipitates, and excellent heat and humidity resistance stability, which prolongs its service life under hot and humid conditions.

The present invention provides a polymer additive and a preparation method therefor, and a polymer composition containing the same. The preparation method includes: allowing an aqueous solution of a hypophosphite and an antioxidant to carry out a free radical reaction with ethylene in the presence of an initiator to obtain an aqueous solution of a diethylphosphinate; mixing the aqueous solution of the diethylphosphinate, an aqueous solution of a metal salt, and an alkali solution to carry out a reaction under a condition of a pH value of 3.5-3.8 to obtain a diethylphosphinate metal salt slurry; and mixing and stirring the diethylphosphinate metal salt slurry and a flocculant to obtain a diethylphosphinate metal salt flocculate, and performing filtering, washing, and drying to obtain the polymer additive. According to the present invention, through the design of the preparation method, the polymer additive with a low acid value and high thermal stability can be obtained. When used as a flame retardant to prepare the polymer composition, the polymer additive can reduce mold scale during injection molding and enable the polymer composition to have less water boiling precipitate, thereby improving the stability of the polymer composition under damp-heat conditions.

The present invention provides a polymer additive, and a preparation method and an application thereof. The preparation method comprises the following steps: subjecting an aqueous hypophosphorous acid solution and an antioxidant to a free radical reaction with ethylene under the action of an initiator to obtain an aqueous diethylphosphinic acid solution; subjecting the aqueous diethylphosphinic acid solution, sulfuric acid, and a metal hydroxide to a reaction, followed by adding an alkaline solution to obtain a diethylphosphinate slurry with a pH value of 3.8-4.2; and mixing the diethylphosphinate slurry with a flocculant and stirring to obtain a diethylphosphinate flocculate, followed by filtering, washing, and drying to obtain the polymer additive. According to the present invention, through the design of the preparation method, a polymer additive with a low acid value can be obtained. When used as a flame retardant in preparation of a polymer material, the polymer additive can inhibit auxiliary precipitation during high-temperature processing, reduce mold deposits, and enable a prepared polymer composition to have a lower content of water-boiling precipitates, thereby improving its service life under hot and humid conditions.

The bone fixation screw (10) for spinal implantation features an elongated body (11) that extends between two opposite ends: the first end (14) and the second end (16). The elongated body (11) is designed with a first threaded portion (13) at the first end (14), a second threaded portion (15) at the second end (16) and a nonthreaded intermediate portion (17) with constant diameter (D) between said threaded portions (13, 15). Additionally, there is a fixation kit (30) that includes multiple fixing screws (10) and several screw-to-rod connection elements (20, 60).

The present invention provides an aliphatic polyester, a polyester composition containing the same, and use thereof. The aliphatic polyester includes a dicarboxylic acid residue and a diol residue; the dicarboxylic acid residue includes the following residues: a1) based on a total molar percentage content of a1) and a2) as 100 mol%, 61.2-69 mol% of a succinic acid residue; and a2) based on the total molar percentage content of a1) and a2) as 100 mol%, 31-38.8 mol% of a sebacic acid residue; and the diol residue is selected from a 1,4-butanediol residue with a molar content at least equal to that of the dicarboxylic acid residue. In the present invention, the aliphatic polyester has good uniformity in terms of transverse and longitudinal tear resistance, high tensile strength, and a short biological disintegration period under home composting conditions, thereby meeting home composting requirements.

The present invention provides an aliphatic polyester and use thereof. The aliphatic polyester includes a dicarboxylic acid residue and a diol residue; the dicarboxylic acid residue includes the following residues: a1), based on a total molar percentage content of a1) and a2) as 100 mol%, 65-90 mol% of a succinic acid residue; and a2), based on the total molar percentage content of a1) and a2) as 100 mol%, 10-35 mol% of a sebacic acid residue; the diol residue is selected from a 1,4-butanediol residue with a molar content at least equal to that of the dicarboxylic acid residue; and the aliphatic polyester includes an oligomer with a number-average molecular weight < 1,000 as measured by gel permeation chromatography (GPC), and a mass percentage content of the oligomer with the number-average molecular weight < 1,000 as measured by GPC in the aliphatic polyester is 0.08-3.5 wt%. A packaging film prepared from the aliphatic polyester possesses both good food contact performance and unwinding performance.