Abstract: Disclosed is a preparation method for triphenylchloromethane, comprising the following steps: adding hydrochloric acid or a mixture of hydrochloric acid and Lewis acid to a mixture of triphenylmethanol and an organic solvent; stirring for reaction; removing the water layer after the completion of reaction to obtain an organic solution containing triphenylchloromethane. In the method, the conversion rate of triphenylmethanol is almost quantitative to be above 99%, and the content of triphenylchloromethane in the product obtained is above 99%. The operation is simple, and no waste gas is generated. Therefore, the method is environmentally friendly and suitable for industrialized production and can achieve better economic benefits.

Abstract: A method for training a multimedia recommendation model is provided. The method includes: iteratively training a plurality of multimedia recommendation models with the same model structure; determining, based on a first association model determined at an ith model determination of a first multimedia recommendation model, a second association model corresponding to the first multimedia recommendation model determined at a (i+1)th model determination; and determining, based on model parameters of the first multimedia recommendation model and the second association model, a target model parameter of the first multimedia recommendation model, wherein the model parameter of each of the plurality of multimedia recommendation models is a weight parameter.

Abstract: A sound transmission holder transmits a sound signal output by a sound generating unit of an. The sound transmission holder includes a frame body, a first bridging portion, a second bridging portion and an accommodating portion. The frame body has a hollow portion. The frame body includes a first section, a second section and a third section. The first bridging portion and the second bridging portion are respectively disposed on the first section and the second section and abut against a casing of the electronic device to position the frame body. The accommodating portion is disposed on the third section and accommodates the sound generating unit. The sound signal is guided to the first bridging portion and the second bridging portion via the hollow portion.

Abstract: A metal workpiece indentation marking device, comprising a frame, a striking head, an automatic marking die, a gripper and a two-dimensional moving mechanism, wherein the top of the striking head is connected to the frame; the striking head can move up and down; the automatic marking die is fixedly disposed at the bottom of the striking head; a clamping jaw for clamping a metal workpiece is disposed at the top of the gripper; the gripper can move back and forth or left and right under the action of the two-dimensional moving mechanism, such that a position to be marked at the top of the metal workpiece can be located under the automatic marking die.

Abstract: A torsion shaft structure based multi-link all-electric servo synchronous bending machine, comprising a machine frame, a lower die fixedly connected to the machine frame and used for bending, a slider capable of moving up and down along the machine frame, and an upper die fixedly connected to the slider and cooperating with the lower die to perform bending, wherein the slider is left-right symmetrically connected to drive mechanisms for driving the slider to realize a transmission ratio adjustable motion.

Abstract: A method manages microservices. A number of processors identifies configuration information for a set of assemblies. The number of processors configures a set of namespaces in a computer system for the set of assemblies using a first set of permissions needed to set up the set of namespaces using the configuration information. The number of processors installs the set of assemblies using a second set of permissions using the configuration information. The second set of permissions has a lower level than the first set of permissions.

Abstract: A sound transmission holder transmits a sound signal output by a sound generating unit of an. The sound transmission holder includes a frame body, a first bridging portion, a second bridging portion and an accommodating portion. The frame body has a hollow portion. The frame body includes a first section, a second section and a third section. The first bridging portion and the second bridging portion are respectively disposed on the first section and the second section and abut against a casing of the electronic device to position the frame body. The accommodating portion is disposed on the third section and accommodates the sound generating unit. The sound signal is guided to the first bridging portion and the second bridging portion via the hollow portion.

Abstract: A motor, a compressor and a refrigeration device are provided. The motor has a stator and a rotor. The stator has a stator core and a winding. The stator core is provided with multiple stator protruding teeth. The winding are wound on the teeth. The rotor has a rotor core and a permanent magnet. The permanent magnet is arranged on the rotor core. A ratio of the number of the stator protruding teeth to the number of phases of the winding is adaptable to adjust the strength of a demagnetization reverse magnetic field generated by energizing the winding.

Abstract: The present invention discloses an error unbiased approximate multiplier for normalized floating-point numbers and an implementation method of the error unbiased approximate multiplier. The error unbiased approximate multiplier includes a symbol and exponent bit module, a mantissa approximation module and a normalization module, wherein the symbol and exponent bit module processes symbolic operation and exponent bit operation of the floating-point numbers; the mantissa approximation module obtains a mantissa approximation result under different accuracy requirements by summing a result of multilevel error correction modules; and the normalization module adjusts an exponent bit according to the operation result of the mantissa and processes the overflow of the exponent bit to obtain the final product result.

Abstract: A method and a device for transaction clearing are used to increase clearing flexibility and reduce server load pressure. The method includes receiving first clearing requests transmitted by a quantity N of terminals, where N>1 (201); according to the first clearing requests, acquiring transaction data of the quantity N of terminals from a database (202); initializing a cache queue, and loading the transaction data into the cache queue (203); reading the transaction data in the cache queue, and performing a clearing process on the transaction data (204); and writing a clearing result into the database and feeding back the terminals with an execution result of the first clearing requests (205).

Abstract: The present invention relates to a method for constructing a nanodrug with adhesion in small intestine, including activating a basic amino acid with a small molecular catalyst, adding a polysaccharide solution and reacting to obtain an amphiphilic polymer; then adding a drug solution and mixing uniformly, to obtain drug-loaded nanoparticles including a hydrophilic portion that is the basic amino acid and a hydrophobic portion that is the polysaccharide and drug, wherein the drug has radioprotective effect or can inhibit ionizing radiation-induced cell death; and adding the drug-loaded nanoparticles to a dopamine solution to obtain a nanodrug including the basic amino acid and polydopamine on the surface after the reaction. The present invention provides an oral nanodrug with adhesion in intestinal tract, and the nanodrug has good biocompatibility, adhesion in small intestine and mucus barrier penetration ability, and can withstand the acid and alkali environment in the gastrointestinal tract.

Abstract: A torsion shaft structure based multi-link all-electric servo synchronous bending machine, comprising a machine frame, a lower die fixedly connected to the machine frame and used for bending, a slider capable of moving up and down along the machine frame, and an upper die fixedly connected to the slider and cooperating with the lower die to perform bending, wherein the slider is left-right symmetrically connected to drive mechanisms for driving the slider to realize a transmission ratio adjustable motion.

Abstract: A pump assembly, fluid machinery, and a heat exchange device. The pump assembly includes: a lower flange; a lower friction-reducing ring; a cylinder, the lower friction-reducing ring being disposed inside the cylinder, and the lower flange being disposed below the cylinder; and a piston assembly arranged inside the cylinder and includes a piston sleeve and a piston slidably arranged inside the piston sleeve. The lower friction-reducing ring has a central hole. A position-limiting protrusion is disposed on a surface of the piston sleeve, which faces the lower flange. The limiting protrusion extends into the central hole of the lower friction-reducing ring, fits and is limited by the lower flange.

Abstract: The disclosure provides a mixed rendering system and a mixed rendering method. The mixed rendering system includes a client device configured to perform: determining at least one user-interactable object of a virtual environment; rendering the at least one user-interactable object; receiving a background scene frame of the virtual environment; blending the at least one rendered user-interactable object with the background scene frame as a visual content of the virtual environment; and providing the visual content of the virtual environment.

Abstract: Some embodiments of a disclosure provide a piston limiting structure, a compressor, and a heat exchange apparatus. The piston limiting structure includes: a cylinder, having a piston hole perpendicular to an axial direction of the cylinder and penetrating the cylinder, wherein a projection of the piston hole in a penetrating direction is circular; a piston, disposed in the piston hole and slid in the piston hole, wherein a side wall of the piston is provided with a limiting surface, and the limiting surface does not penetrate two ends of the side wall of the piston along an axial length of the piston; and a limiting member, wherein the cylinder is provided with a limiting hole penetrating from an outer wall of the cylinder to the piston hole, the limiting member is mounted in the limiting hole , and the limiting member abuts against the limiting surface.

Abstract: Provided is a piston limiting structure, including: a cylinder, a piston, and a flange provided with a limiting piece, the cylinder has a piston hole perpendicular to an axial direction of the cylinder and penetrating through the cylinder, and a projection of the piston hole in a penetrating direction is circular; the piston is disposed in the piston hole in a form-fit manner and is slid in the piston hole in a reciprocating manner, a side wall of the piston is provided with a thrust groove, a bottom surface of the thrust groove forms a thrust surface on the side wall of the piston, and the thrust groove does not penetrate through two ends of the side wall of the piston along an axial length of the piston; and the limiting piece abuts against the thrust surface.

Abstract: A precision compensation mechanism of a full-automatic bidirectional flanging machine comprises an upper die X-direction fine adjustment assembly, an upper die Y-direction fine adjustment assembly, a lower die X-direction fine adjustment assembly and a lower die Y-direction fine adjustment assembly, wherein the fine adjustment assemblies each comprise N adjusting threaded sleeves, N adjusting screws and a threaded sleeve rotation driving device; wherein the N adjusting threaded sleeves are threaded into an upper opening or a lower opening of a C-shaped flanging beam along the length direction of an upper die or a lower die; the outer wall surfaces of the N adjusting threaded sleeves are threaded into the upper opening or the lower opening of the C-shaped flanging beam to form N screw thread pairs I with the thread pitch of P1.

Abstract: A high-precision heavy-load numerically-controlled flanging machine comprises a machine frame, an edge pressing assembly, a flanging beam and a flanging beam transmission mechanism that comprises an inclined slide rail, an inertia block and two crank-connecting rod mechanisms; the flanging beam is provided with a driving inclined plane; the inclined slide rail is mounted on the machine frame; the inertia block is provided with two non-parallel inclined planes, wherein one inclined plane of the inertia block is slidably mounted on the inclined slide rail to form a sliding pair I, and the other inclined plane of the inertia block is in sliding fit with the driving inclined plane of the flanging beam to form a sliding pair II; cranks of the two crank-connecting rod mechanisms are hinged on the machine frame.

Abstract: A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.

Abstract: A waterproofing structure is disposed between a first assembling component and a second assembling component of an electronic device. The second assembling component is detachably installed on the first assembling component. The waterproofing structure includes a sealing component, an abutting component and a sliding component. The sealing component is located between the first assembling component and the second assembling component. The abutting component is fixed on the second assembling component. The sliding component is slidably installed on the first assembling component. When the sliding component slides along a first direction, the sliding component forces the abutting component to drive the second assembling component to move toward the first assembling component, so that the sealing component is pressed by the first assembling component and the second assembling component.