42results about How to "Little change in volume" patented technology

At least two metallic materials containing element such as silicon and tin, which has ability of insertion and desertion of lithium element, and optionally another metallic material containing element such as copper are molten to prepare a melt. The melt is rapidly cooled by strip-cast method at a cooling rate of more than 2x103 ° C. / sec and no more than 104 ° C. / sec to be cast. Further, the cast is milled and classified into alloy powder having an average particle size of 0.1 mum to 50 mum. The alloy powder and conductive agent are laminated with binder onto a collector to obtain a negative electrode for a secondary battery. The negative electrode is employed to obtain a lithium secondary battery having high electric charge and discharge capacity, and good property of charge and discharge cycle.

The invention relates to an ultrasonic diagnosis instrument with a RFID (radio frequency identification) function. The ultrasonic diagnosis instrument comprises a transducer and an ultrasonic diagnosis module, wherein the transducer is used for receiving control signals from the ultrasonic diagnosis module, and uploading the collected diagnosis information to the ultrasonic diagnosis module. The ultrasonic diagnosis instrument is characterized by also comprising a RFID receiving module, wherein the RFID receiving module is used for receiving radio frequency signals from a RFID label, demodulating and decoding the signals, and then uploading the signals to the ultrasonic diagnosis module. The ultrasonic diagnosis instrument has the characteristics that when writing-in is carried out on the RFID label in advance, enough time is provided for repeated proofreading, thus the identification information can be accurately written-in, and the reading-out accuracy from the RFID label is ensured; and when the object to be detected is detected (or diagnosed), the identification information of the detected object is read while diagnosing, long-time complicated entering operation is not required, the detection process is more fluent, the working efficiency of the ultrasonic diagnosis instrument with the RFID function is greatly improved, and the whole working efficiency is further improved.

The invention discloses a filling type investment casting wax based on lipophilic micron graphite and a preparation method thereof. A filler type investment casting wax based on lipophilic micron graphite comprises basic components, the basic components are composed of the following raw materials in mass percentage: 40-60% of paraffin wax, 6-10% of rosin or rosin resin, 3-10% of PE wax, 25-35% of petroleum resin, 5-15% of lipophilic micron graphite, and 0-0.5 wt% of pigments as basic components. At the same time, the preparation method of the filling type investment casting wax based on lipophilic micron graphite is also disclosed. The filling type investment casting wax of the present invention has moderate softening point, small penetration and linear shrinkage, high bending strength and small ash content, which can well meet the requirements of high dimensional accuracy and high surface quality of precision castings, and meet the requirements of actual production needs.

The present invention proposes a high-pressure-resistant visual window suitable for optical measurement of injectors with wide nozzle angles. The stepped surface is matched with the quartz glass window, the axis of the quartz glass window is not perpendicular to the axis of the constant volume bomb body, the centering O-ring is used to radially position the quartz glass window, a bypass hole is provided in the sleeve, and the quartz glass window The entire side of the shell is communicated with the cavity of the constant volume bomb body through the bypass hole opened on the sleeve to balance the air pressure on the bottom and side of the quartz glass. Several short bolts lock the quartz glass window tightly between the sleeve and the end cover. between. When using PLIF method to study the spray combustion characteristics of multi-hole injectors, it is difficult to measure the spray of wide nozzle angle injectors due to the limited window area of ​​constant volume bombs, and it is difficult to obtain the window intensity if the window area is too large Guaranteed technical issues, improve service life and safety factor.