9results about How to "Prevent narrowing" patented technology

The present invention discloses a signal power control circuit of a communication system device, which relates to the field of communication technology and includes a first resistor, a second resistor, a third potentiometer, a fourth resistor, a fifth resistor, a first operational amplifier, a first pin, and a second pin. The present invention can perform amplitude limiting detection and adjustment on the amplification of communication signals.

The utility model discloses a multi -way valve with high accuracy flow control structure relates to valve technical field, including valve body, the valve body includes the casing, one end of casing is fixedly connected with sealed positioning section, and the water inlet telescopic section is inserted to one end of sealed positioning section, and the inboard wall of sealed positioning section is equipped with the joint interface, and the taper filter is clamped, the cavity of casing is fixedly connected with valve seat through the mouth opening, the valve core is clamped in valve seat, and the top of casing is fixedly connected with main motor. The utility model provides valve body, on the basis of realizing the filtration and avoiding the influence precision, and at the same time, under the condition of not with the pipeline dismounting, the filtration assembly is convenient to take out and clean, so that the existing multi -way valve is led to the key component easy wear and tear, block and affect control precision because of lacking filtration assembly, and filtration assembly dismounting and cleaning need to dismount the valve as a whole, and the problem of complicated and laborious operation.

A comprehensive repairing platform for missing books comprises a base station, and a flattening unit and a punching unit are arranged on the base station. The flattening unit comprises a first supporting frame, a pushing pressing rod is arranged on the first supporting frame in a threaded connection mode, and a pressing plate is rotationally arranged on the lower portion of the pushing pressing rod. A punching unit is arranged on the side edge of the flattening unit and comprises a second supporting frame, a plurality of limiting holes are formed in a second cross beam in an array mode, punching needle tubes are arranged in the limiting holes in a sliding mode, and ball bearings are arranged on the upper portions of the punching needle tubes. A second pressing plate is further hinged to the second cross beam. According to the utility model, the book can be fully flattened, so that a sufficient space is reserved for supplementing missing pages, and the corners of the repaired book are neat; the secondary packaging mode through punching is also convenient for re-sealing and repairing, and the implementation mode can prevent the edge of the book from being cut and the book from being narrowed.

This invention discloses a sterically hindered hydrophilic nano-silica, its preparation method, and its applications, belonging to the field of shale oil and gas storage modification and production enhancement technology. The sterically hindered hydrophilic nano-silica is modified with ethylene oxide and aniline. The nano-silica has a particle size of 2-5 nm, the mass percentage of ethylene oxide to nano-silica is 1.5-3:1, and the mass percentage of aniline to nano-silica is 0.8-3:1. The prepared hydrophilic nano-silica can be used in the preparation of reagents to reduce fracturing fluid damage. This hydrophilic nano-silica competes with polymers for adsorption, reducing polymer adsorption blockage and thus reducing fracture damage.

The application discloses a temperature control method and device of a semiconductor device, equipment and a storage medium, and relates to the technical field of temperature control, and comprises the following steps: based on the slit cavity observation band brightness of the edge infrared observation annular area of a rapid thermal processing furnace and the surface emissivity of a wafer, the equivalent radiation temperature of the slit cavity observation band brightness is calculated; the equivalent temperature of the inner edge of a quartz bell jar is solved; based on the equivalent radiation temperature and the equivalent temperature of the inner edge of the quartz bell jar, the net radiation incident heat power transmitted from the annular slit radiation cavity of the rapid thermal processing furnace to the wafer edge band of the wafer is calculated; and based on the net radiation incident heat power, the target lamp area power replacement vector of the rapid thermal processing furnace is solved. The application can improve the initiative and accuracy of wafer edge temperature control.

The invention relates to a micro-groove type power device with low warping stress, which is characterized in that any micro-groove type cell comprises a first type of groove unit and a second type of groove unit; a first type of conductive polycrystalline silicon and an insulating dielectric layer in the groove are arranged in each first type of groove, the second type of conductive polycrystalline silicon is in ohmic contact with front-side first electrode metal located above the front side of the semiconductor substrate, and the first type of conductive polycrystalline silicon is electrically connected with front-side second electrode metal located above the front side of the semiconductor substrate. And the second type of conductive polycrystalline silicon is insulated and isolated from the first electrode metal on the front surface through the insulating dielectric layer in the groove. According to the invention, the stress in the processing process of the micro-groove type power device can be reduced, the photoetching sleeve deviation of the contact hole caused by warping is avoided, and high-consistency threshold voltage and saturation voltage drop are obtained.

The utility model discloses a metal pipe fitting quick dismounting type connector, which belongs to the technical field of quick dismounting connectors, and comprises a quick dismounting female head and a quick dismounting male head, one side of the quick dismounting female head is provided with a connecting plug, a plurality of balls are arranged in the circumferential direction of the connecting plug, the outer side of the quick dismounting female head is sleeved with a ring sleeve which is reset through a reset spring, and the ring sleeve can limit the positions of the balls; one side of the quick release male head is provided with an annular groove matched with the ball, and the other side of the quick release male head is provided with an outer hexagon nut. A symmetrical valve body structure is matched with a limiting column to ensure that a fluid channel is always coaxial and unblocked, and channel narrowing caused by different elastic forces of springs on the two sides is avoided; and the multiple sealing ring layout enhances the sealing reliability under the complex working condition.

This embodiment relates to a refrigerator with a light source in the storage compartment, providing a technical solution that provides a light source while avoiding a reduction in the volume of the storage compartment and a narrowing of the airflow path. The refrigerator of this embodiment includes: an airflow forming member disposed in the storage compartment to form an airflow path for cold air; a light source disposed in a region opposite to the airflow path on the storage compartment side surface of the airflow forming member; and a covering member installed in the region opposite to the airflow path on the storage compartment side surface of the airflow forming member, covering the light source from the storage compartment side.