Abstract:
A manufacture method of a three dimensional (3D) braided composite tube with a throat section includes: providing an assembled mandrel comprising an upper mandrel and a lower mandrel, and braiding an 3D braided inner layer on the upper mandrel; winding fiber yarns to form a fiber yarn layer over the 3D braided inner layer; tightening the 3D braided inner layer to the assembled mandrel by an appropriate tension force when winding; and infiltrating resin and increasing temperature to cure the resin for obtaining a composite tube with a narrower throat section. The present invention takes advantage of winding fiber yarn outer layer to keep the radius of the throat of the 3D braided inner layer to meet design requirement. Additionally, the hoop strength of the throat section is increased so that the metal shell can be made thinner to reduce the weight of the rocket nozzle.
Abstract:
A detecting device and a detecting method for monitoring a battery module are provided. The battery module is electrically connected to a load and includes a first battery unit, a second battery unit and a connecting device. The connecting device connects the positive electrode of the first battery unit to the negative electrode of the second battery unit. The detecting device includes a shunt, a voltage detecting module and a control module. The shunt is serial connected between the battery module and the load to measures the load current. The voltage detecting module measures the voltage difference across the connecting device between the positive electrode and the negative electrode. The control module computes the equivalent resistance across the connecting device between the positive electrode and the negative electrode according to the load current and the voltage difference. Therefore, the hazard caused by aging of the electric circuit can be prevented by monitoring the equivalent resistance, which infers the change of the assembly quality.
Abstract:
The invention provides a robotic arm for transporting a substrate in an ultrahigh vacuum including a carrier module and a drive module. The drive module includes a magnetic coupling, a first transmission module, a second transmission module, and a third transmission module. The magnetic coupling includes an inner shaft and an outer shaft. The first transmission module drives the first active unit of the magnetic coupling to turn a first passive unit of the inner shaft by magnetic force. The second transmission module drives the second active unit of the magnetic coupling to turn a second passive unit of the outer shaft by magnetic force. The third transmission module drives the magnetic coupling and the carrier module to perform vertical movement. The carrier module will achieve rotational motion or extending motion when the inner shaft and the outer shaft are driven by the first transmission module and the second transmission module of the drive module.
Abstract:
Disclosed is an electronic seal for sealing a door. The door is equipped with a latch. The electronic seal includes a plug and a socket. The plug can be inserted in the socket through the latch. Thus, the door is sealed by the electronic seal. The door cannot be opened without breaking the electric seal. The electronic seal records any event of breakage.
Abstract:
Disclosed is an apparatus for measuring the state of charge of a battery pack via measuring an open circuit voltage. The apparatus includes a voltage measurement unit electrically connected to the battery pack, a current sensor electrically connected to the battery pack, a current measurement unit electrically connected to the current sensor, and a processor electrically connected to the voltage measurement unit and the current measurement unit. The processor measures the voltage and current of the battery pack via the voltage measurement unit and the current measurement unit.
Abstract:
A hydraulic brake system includes a body with cavities, a vacuum brake booster port, a first caliber port and a channel system defined therein. An accumulator is located in a first one of the cavities. A first proportional solenoid valve is located in a second one of the cavities. A traction control valve is located in a third one of the cavities. The channel system is connected to the accumulator, the first proportional solenoid valve and the traction control valve via the first, second and third cavities. The channel system is further connected to the vacuum brake booster port and the first caliber port. The vacuum brake booster port, the accumulator, the first proportional solenoid valve, the traction control valve and the channel system are used together to control brake fluid to exert a first baking force on the first caliber port.
Abstract:
Disclosed is a method form making a thermo-stable and transparent resin. In the method, at first, polyborosiloxane is syhthesized by hydrolyzing and condensing a boron-containing compound, used as a precursor, and a silane compound. Then, epoxy group-containing polyborosiloxane is synthesized by grafting an epoxy group to the polyborosiloxane. Finally, an epoxy/PGB composite is synthesized by reacting the epoxy group-containing polyborosiloxane with epoxy for consolidation, thus providing a homogenous, stable, net-shaped composite.
Abstract:
A pedestrian detector includes an image-taking mechanism and an image analyzer. The image-taking mechanism is provided on a vehicle and used to take an image in front of the vehicle. The image analyzer is connected to the image-taking mechanism and used to receive the image from the image-taking mechanism and analyze the image to determine whether the image conforms to a pedestrian to determine whether there is a pedestrian in front of the vehicle.
Abstract:
The present invention relates to a facile method of preparing 1,4-bis(chlorodifluoromethyl)benzene, comprising the steps of: (A) providing a reactant liquid of 1,4-bis(difluoromethyl)benzene; optionally (B) providing a light source for UV radiation; and (C) introducing chlorine gas into the reactant liquid at a temperature of 50-90° C. under a pressure above 1 atm to obtain 1,4-Bis(chlorodifluoromethyl)benzene. The invented facile method can be utilized in a batch process or a continuous process for effective production of 1,4-bis(chlorodifluoromethyl)benzene.
Abstract:
Disclosed is an efficient and inexpensive method for making an effective shock-absorptive material from a micro- or nano-colloidal solution. The method includes the steps of providing a liquid mixture via mixing silicon dioxide grains, poly ethylene glycol and an additive evenly, providing a colloidal solution-based raw material via heating the liquid mixture to evaporating and removing the additive, providing a colloidal solution-based mixture via adding a cross-linking agent into the colloidal solution-based raw material, and molding the colloidal solution-based mixture into a shock-absorptive plastic material via filling the colloidal solution-based mixture in a mold and casting ultraviolet light onto the mold or heating the mold to heat and cure the colloidal solution-based mixture.