43results about How to "Reduce air density" patented technology

An engine system and method are disclosed for controlling pre-ignition of an alcohol fuel. In one embodiment, the fuel injection timing is adjusted to cause the fuel to avoid combustion chamber surfaces. In another embodiment, the fuel injection timing is adjusted to spray the fuel directly onto the piston surface to cool the piston. Also disclosed is a cylinder cleaning cycle in which engine knock is purposely caused for one to hundreds of engine cycles by adjusting the fuel content away from alcohol toward gasoline. Further measures to cause knock which are disclosed: adjusting spark timing, intake boost, exhaust gas fraction in the cylinder, cam timing, and transmission gear ratio.

The screen is exempt from variation in brightness due to uneven temperature distribution. The color liquid crystal display unit has a color display panel of transmissive type and a backlight unit placed behind the color display panel. The backlight unit has a plurality of LEDs connected in series, the drive unit to drive the LEDs in correspondence with the LEDs, and the temperature sensor to detect the temperature of LEDs. The groups of LEDs are arranged in regions where the display unit has the same temperature. The drive unit controls current to be supplied to LEDs in response to temperature detected by the temperature sensor so that the LEDs retain the constant brightness even when the LEDs fluctuate in temperature.

The invention relates to a control method for realizing an overload autopilot by using an accelerometer. The control method comprises the following steps of: firstly, calculating a functional relation between the attitude angular rate and the overload of a missile body under an inertial coordinate system; secondly, obtaining a damping circuit grain Kg and a stable circuit gain KA of the overload autopilot at a characteristic point of a missile track by adopting a root locus method of a classical control theory; and finally, constructing a damping circuit by using an accelerometer signal under the missile body coordinate system according to the result obtained in the first step and realizing the overload autopilot by using the accelerometer. According to the control method disclosed by the invention, aiming at the dynamic characteristic of a guide missile, by using the function relation between the overload and the angular rate and using a method of constructing the damping circuit by repeatedly using the accelerometer through the overload autopilot, the mathematical simulation validation can be carried out and a corresponding engineering realization scheme is provided.

One aspect of the present invention can include an electric connection box having a circuit board, a case inside of which said circuit board is housed, a plurality of fitting depressions capable of being fitted with an external electrical component, positioned on a side wall of the case opposing a board surface of the circuit board. Further, an air path inside of said case is defined by the plurality of fitting depressions positioned as an arrayed side by side with a spacing in between, and the air path circulates the air up and down between the plurality of fitting depressions, and an inlet positioned in the case and in communication with the air path, an exhaust outlet is positioned in the case in communication with the air path and positioned above said inlet, and a heat generating component is positioned in the air path.

Methods and systems are provided for regulating airflow through a charge air cooler integrated in an intake assembly. In one example, an engine intake assembly comprises a plenum having an integrated charge air cooler (CAC), a first header seal positioned around a circumference of a first CAC header, and a first rotatably movable seal positioned in a bypass passage of the plenum. The first movable seal interfaces via sliding contact with the first header seal and adjusting a position of the first movable seal may vary the amount of airflow through the bypass passage.

Disclosed is a method for producing a blade for a turbomachine, which method comprises:

• • providing a blade root, having a first platform region, from a first material;
  • providing on the first platform region at least one capsule that is filled with a metallic and/or ceramic powder that comprises at least one second material which is different from the first material, for producing a blade airfoil having a second platform region;
  • producing and shaping a blade airfoil from the capsule that is filled with the powder by at least one thermal input method, thereby connecting the blade root to the blade airfoil in respective platform regions.

Also disclosed is a blade which is obtainable and/or obtained by this method.

The invention provides an adjustable sub vacuum earplug, and relates to the field of sound-proof devices. The earplug comprises a sound-proof shell, a speaking diaphragm and an air pump cylinder, wherein the sound-proof shell is internally provided with a cavity, a sound transmission channel is formed in the sound-proof shell, and the sound transmission channel is communicated with the cavity; the speaking diaphragm is packaged on the sound transmission path of the sound transmission channel; the air pump cylinder is communicated with the cavity and used for pumping or restoring partial air in the cavity. According to the adjustable sub vacuum earplug, the air density state in the earplug is adjusted easily, tension degree change of the speaking diaphragm is matched, and on one hand, the sound insulation and noise reducing effect of the earplug can be enhanced to protect hearing; one the other hand, the sound insulation and noise reducing effect of the earplug can be reduced to ensure the communication ability of a wearer, and a sound insulation state and a communication state are switched according to needs.

A helicopter tail rotor pitch-range altering device is disclosed. The device is incorporated into the existing helicopter tail rotor pitch-change control system of a helicopter and automatically alters the amount of tail rotor pitch available from the helicopter's tail rotor pitch-change control system based on changes in density altitude. The device comprises an ambient air density sensing device and a movable member located within or located in proximity to the helicopter tail rotor pitch-change flight control system. In one embodiment, a sealed bellows is connected directly to a movable member within the helicopter tail rotor pitch-change control system. As density altitude changes, the length of the bellows changes accordingly and moves the movable member within the helicopter's tail rotor pitch-change control system providing a varying tail rotor pitch-range based on density altitude.

The invention discloses a light emitting diode with a nitrogen polar surface n-type electron barrier layer. The light emitting diode comprises a substrate, a nitrogen polar nitride layer, a polarity reversal nitride layer, an n-type nitride ohmic contact layer, the n-type nitrogen polar surface electron barrier layer, a non-doped superlattice structure layer, a multi-quantum well active layer and a p-type nitride ohmic contact layer distributed from bottom to top in sequence; and an n-type electrode and a p-type electrode are respectively arranged on the n-type nitride ohmic contact layer and the p-type nitride ohmic contact layer. The nitrogen polar surface n-type electron blocking layer can limit spatially the number of electrons entering an active region; and since a traditional p-type doped electron barrier layer is removed, the injection rate of the holes can be increased, the number of the holes and the number of the electrons injected into the active region are kept at a balanced level, and the probability of electron and hole radiation recombination luminescence in the active region can be improved, so that the performance of the light emitting diode is improved.

The invention discloses a natural ventilation countercurrent type cooling tower air energy power generation device. The natural ventilation countercurrent type cooling tower air energy power generation device comprises an air inlet system and an air energy power generation device body. The power generation device is characterized in that air is directly introduced into a tower barrel of a cooling tower in winter or in a low-temperature environment, and due to the difference between the inner air density and the outer air density of the tower, the air outside the tower is accelerated to flow into the tower barrel, and power generated by air flowing is utilized for power generation. The power generation device has the beneficial effects that the air energy is utilized for power generation, so that the power generating capacity is increased; the suction force of the cooling tower is reduced, and the icing degree of the cooling tower in winter or in the low-temperature environment is improved; and the power consumption of a circulating cooling water system is reduced.

A device and a method for reducing wind resistance power of a large geotechnical centrifuge are provided. A semicircular tube cylindrical cooling device is installed between an internal side of a high-speed rotor system and a cylindrical shell. A serpentine top semicircular tube cooling plate is provided right above a hanging basket, and return helium gas inlet holes are opened at a center of the top semicircular tube cooling plate. A helium gas in a helium gas storage tank passes through helium gas outlets on the helium gas inlet pipes, and enters a centrifuge chamber from a bottom sealing plate. The helium gas is used to replace air in the centrifuge chamber to reduce the wind resistance power and corresponding energy consumption. No vacuuming is required, so sealing requirements are lower. Heat dissipation equipment is placed inside the centrifuge chamber, and a helium gas circulation wind duct is added to improve heat exchange coefficient and heat dissipation effect. A special vibration isolation gasket is used, in such a manner that the vibration transmitted to the top bearing system support device by the main shaft is separated from the centrifuge chamber, thereby avoiding resonance of the centrifuge chamber and the main shaft, and ensuring safety of the centrifuge chamber. The present invention is more economical when operating at an acceleration of below 1500 g, and can maintain the temperature below 45° C.

The disclosure provides a near-space real-time in-site wind speed and direction sensor based on wind pressure prediction. The sensor comprises a housing in a cylindrical shape, a top cover arranged above the housing, n differential pressure amplifying structures, windward-zone differential pressure detection devices, and air-out differential pressure detection devices. The n differential pressureamplifying structures are used for amplifying the differential pressure of wind fluid, wherein the n is larger than or equal to 3; the differential pressure amplifying structures have hollow tube shapes with the thin middle parts and two thick ends and are arranged along different cross sections of the housing; circular holes are formed at connection parts between the two ends of the differentialpressure amplifying structures and the cylindrical wall of the housing; and the differential pressure amplifying structures includes windward zones, middle sections, and air-out zones. The windward-zone differential pressure detection devices are arranged at the windward zones by differential pressure detecting tubes and are used for measuring the differential pressures in the windward zones. Theair-out differential pressure detection devices arranged in the air-out zones by the differential pressure detecting tubes are used for measuring the differential pressures in the air-out zones. And then the wind speed and wind direction of near space are calculated based on the pressure differences in the windward zones and the air-out zones. Therefore, a technical problem that the wind speed anddirection measurement of the near space is affected by the temperature and height greatly in the prior art can be solved.

The invention provides a membrane building structure. The membrane building structure comprises a first membrane material, a second membrane material and a middle supporting piece. The first membrane material and the second membrane material are arranged at intervals, and an interlayer is arranged between the first membrane material and the second membrane material; and the middle supporting piece is arranged between the first membrane material and the second membrane material and used for preventing the first membrane material and the second membrane material from being attached to each other. According to the membrane building structure, the structure is simple, the negative pressure interlayer is arranged between the two membrane materials, air in the interlayer is rarefied, therefore heat transmission between the interior and the exterior of a membrane building caused by the air heat conduction effect is greatly reduced, in summer, a large amount of external heat input into the membrane building can be effectively reduced, and in winter, outward conduction of heat in the building can be effectively reduced. Therefore, energy consumption is reduced, and the membrane building structure is more economical and environment-friendly.

The invention discloses a papain monitoring and early warning device which comprises an automatic biochemical analyzer, an experiment table is fixedly arranged at the top of the automatic biochemical analyzer, a first telescopic rod is fixedly arranged at the top of the experiment table, and a top plate is fixedly arranged at the top of the output end of the first telescopic rod. The papain milk vessel and the enzyme activity detector are arranged, the enzyme activity detector is used for detecting the enzyme activity of papain in papain milk in the papain milk vessel, and then the temperature in the lampshade is observed through the temperature monitor; the temperature monitor and the gas thermometer are matched for monitoring internal and external temperatures, so that the milk heating temperature in the papain milk vessel by the alcohol lamp is obtained, and the situation that the papain milk in the papain milk vessel is heated to disappear due to the fact that the temperature is too high when the enzyme activity degree is continuously detected is prevented; the continuity and the stability of the papain during continuous monitoring are improved.