168 results about "Density of air" patented technology

A method for calculating a high-altitude power curve for a wind turbine is provided, the method including the steps of determining a c_p-λ curve for a predetermined blade pitch angle of said wind turbine; calculating a first power curve without power limit based on the c_p-λ curve; and calculating the high-altitude power curve with power limit from said first power curve, thereby using a site air density.

A protecting case for protecting an electronic device includes a hollow main body. The electronic device is received in the main body. The main body is filled with gas having a density less than a density of air, to make the main body and the electronic device suspend in air while received in the main body.

A vehicle air conditioning system includes a compressor, a condenser, an evaporator, a humidity sensor and a controller. The compressor is configured to compress refrigerant and the condenser is fluidly coupled to the compressor to receive the refrigerant from the compressor. The evaporator is fluidly coupled to the condenser to receive the refrigerant from the condenser and fluidly coupled to the compressor to supply the refrigerant to the compressor. The humidity sensor is positioned proximate the evaporator to detect moisture density of air passing through the evaporator towards a vehicle passenger compartment. The controller is operatively coupled to the humidity sensor and the compressor to cycle the compressor on and off to maintain the moisture density in the air being cooled by the evaporator and sensed by the humidity sensor below a predetermined moisture density threshold.

A method for determining a pulmonary volume change includes: receiving a respiration event from a subject in an airflow chamber; interrupting the respiration event by an occlusion of the airflow chamber initiated at a first time instant and terminated at a second time instant subsequent to the first time instant; taking a plurality of measurements of airflow rate through the airflow chamber between the second time instant and a third time instant subsequent to the second time instant; and determining a pulmonary volume change substantially equal to a reduction of a pulmonary air volume by a pulmonary response air volume and a normal air volume, wherein the pulmonary volume change is related to a change in density of air in the airflow chamber.

The invention discloses a sea wind resource evaluation method based on a WRF mode. The sea wind resource evaluation method based on the WRF mode mainly comprises the steps of obtaining WRF numerical value weather forecast data and anemometer tower data, building a vertical shear model of wind, building a wind speed probability model, evaluating air density and evaluating wind power density and annual energy output. The sea wind resource evaluation method based on the WRF mode evaluates sea wind resources through the WRF numerical value weather forecast data, and effectively overcomes the defect that a traditional wind resource evaluation technology is low in accuracy.

The invention designs a numerical weather prediction-based early warning method for windage yaw flashover of a power transmission line. The method comprises the steps of firstly, performing grid point forecast wind velocity mapping processing by adopting an inverse distance weighted interpolation algorithm, and finishing a wind velocity component perpendicular to the line according to an included angle between a wind direction and a line route; secondly, calculating a minimum air gap between the line and a pole tower by applying a rigid straight bar method by taking a typical cup tower as an example; and finally, performing air density, humidity and precipitation correction on a gap breakdown voltage to obtain a flashover voltage value under a forecast weather condition, and comparing the flashover voltage with a system running voltage to finish graded early warning of the windage yaw flashover. The method has an important practical significance for wind prevention and disaster reduction work of a power grid.

The invention discloses a disc type three-phase magnetic gathering type transverse magnetic field permanent magnet motor which is used for solving the technical problem of low permanent magnet utilization rate of existing transverse magnetic field permanent magnet motors. The technical scheme includes that a combined bilateral stator structure is adopted, stators on two sides are staggered to form a mechanical angle of 360/2N, wherein the N refers to the number of motor poles, a stator on one side is provided with three phases which are distributed circumferentially, a stator of each phase consists of 'E'-shaped silicon steel and a winding, permanent magnets are circumferentially embedded in a disc-shaped permanent magnet panel and are distributed into three circles, polarities of two adjacent permanent magnets on the permanent magnet panel are opposite, and the permanent magnets, the permanent magnet panel and a motor shaft form a rotating portion of the permanent magnet motor. The permanent magnets and the 'E'-shaped silicon steel forms the disc type three-phase magnetic gathering type transverse magnetic field permanent magnet motor with different polarities and different power levels, so that utilization rate of the permanent magnets, magnetic flux density of air gaps and output torque are improved, and axial volume of the motor is reduced.

The invention provides a solid density measure method and a method for detecting density qualification of a target material. The solid density detection method comprises: providing a solid sample; measuring the mass of the solid sample in air as a first measure mass M0; submerging the solid sample in a liquid and measuring the mass of the solid sample in the liquid as a second measure mass M2; according to a formula of M0+rho<air>gV<sample>=M2+rho<liquid>gV<sample> to acquire the volume of the solid sample, wherein rho<air> is the density of air, rho<liquid> is the density of the liquid; and according to the volume of the solid sample and the real mass to acquire the density of the solid sample, wherein the real mass is M0+rho<air>gV<sample> or M2+rho<liquid>gV<sample>. The invention also provides the method for detecting the density of a target material is qualified. The solid density measure method disclosed by the invention is capable of improving the detection precision of the target material and improving the film plating quality in sputtering technology.

The invention discloses a fan power curve data preprocessing method based on outlier detection. According to the method, based on collected fan data comprising wind speed, active power, environment temperature, a pitch angle, etc. and real-time operating data obtained through a supervisory control (SCADA) system, outlier detection criteria are used to perform abnormal data cleaning, air density obtained through calculation is utilized to correct wind speed data, an outlier detection algorithm is used to detect and eliminate outliers in fan power curve data. According to the data preprocessingmethod, the outlier detection criteria guarantee the effectiveness of fan data information; wind speed correction guarantees the comparability of the fan data; and the outlier detection algorithm guarantees the reliability of final power curve data. The method is based on data driving, does not have a special requirement on data and is high in universality. Compared with the prior art, data credibility is higher, the process is more standard, and a high theoretical property and practicability are achieved.

The invention is applied to the technical field of air conditioners, provides an air conditioner, and aims to solve the problems of air conditioner performance attenuation and using effects reduction caused by the fact that air volume when an air conditioner is used for a region with low atmospheric pressure and air density is slightly smaller than actually required air volume in the prior art by virtue of linkage control of atmospheric pressure of a mounting site as well as a fan and a compressor. The air conditioner comprises a controller, an outdoor fan, a compressor and an atmospheric pressure feedback system for feeding back the atmospheric pressure of the mounting site, wherein the performance attenuation ratio of the air conditioner is calculated according to the atmospheric pressure of the mounting site, and the rotating speed of the outdoor fan and the output frequency of the compressor are corrected according to the performance attenuation ratio. The invention further provides a control method for the air conditioner. According to the air conditioner and the control method, the linkage control of the performance attenuation ratio as well as the wind speed of the outdoor fan and the output frequency of the compressor is realized according to the atmospheric pressure of the mounting site, so that the cooling and heating performance of the air conditioner running in a low-atmospheric pressure environment is prevented from being attenuated, and the air conditioner using effects of a user are improved.

A pressure support device implements compensation for variations in air density of its operating environment. A pressurized flow of breathable gas is generated for delivery to the airway of a subject. One or more parameters associated with the ambient environment of the pressure support device are determined. These parameters can include one or more of an ambient barometric air pressure, an ambient air temperature, or ambient air humidity. In some embodiments, one or more assumed parameters associated with the ambient environment of the pressure support device are determined based on typical sleeping conditions of the subject. An ambient air density of the ambient environment of the pressure support device is estimated based on one or more of the parameters and/or assumed parameters. A flow rate of the pressurized flow of breathable gas is adjusted based on the estimated ambient air density of the ambient environment of the pressure support device.

The invention discloses a Fe2-xTixO3/FTO photo-anode preparing technology and a treatment method capable of improving photocurrent density of a photo-anode. According to the Fe2-xTixO3/FTO photo-anode preparing technology, a photo-anode precursor is prepared in hydrothermal environment with solubility trivalent ferric salt and alkali metal nitrates serving as a titanium source in an organic titanium solution and FTO conductive glass serving as a carrier, and the treatment method is adopted for treating the precursor; through the photoelectricity test, it shows that after the photo-anode is prepared through the technology, the photocurrent density of Ar-Fe2-xTixO3/FTO is 2.6 0mA/cm<2> at 1.23eV, the photocurrent density of Air-Fe2O3/FTO is 0.12 mA/cm<2> at 1.23eV, and the photocurrent density is improved by more than 21 times. Therefore, according to the prepared photo-anode and the treatment method of the photo-anode, the advanced technical means with the low energy consumption and the efficient water decomposition is achieved, the good industrial application prospect is achieved, and the technology and the method can be used for relieving the global increasingly-strained energy supply situation at present.

A control for an engine having a variable valve actuation mechanism is provided. A map indicating a correlation among a rotational speed, a gauge pressure of an intake manifold, a lift amount of an intake valve, a phase of the intake valve and an intake air amount of the engine under a reference condition of a predetermined reference atmospheric pressure and a predetermined reference intake air temperature is defined. An intake air amount for the reference condition is determined as a reference intake air amount by referring to the map based on a current rotational speed, a current gauge pressure, a current lift amount and a current phase. The reference intake air amount is corrected with a ratio between an air density under a current condition of a current atmospheric pressure, a current intake air temperature and a current gauge pressure and an air density under the reference condition to calculate an intake air amount for the current condition.

The invention provides an air buoyancy correcting device used in mass measurement of a counterbalance, which is used for measuring and calculating the air buoyancy corrected value in the mass measurement of an E1 grade counterbalance. A cavity for accommodating the counterbalance is arranged in an enclosed box; a sound output device is arranged in the cavity; a sound pressure acquiring device is used for acquiring a sound pressure signal; a temperature sensor, a humidity sensor, a pressure sensor and a CO2 sensor which are arranged outside the cavity are used for acquiring corresponding air environment parameter values respectively; both a sound pressure signal value and an air environment parameter value are transmitted to a comprehensive signal acquiring and processing card; and a computer which is connected with the comprehensive signal acquiring and processing card is used for receiving, calculating and processing signal data provided by the comprehensive signal acquiring and processing card. The environmental air density and the counterbalance bulking value are calculated, so that the air buoyancy corrected value in the mass measurement of the counterbalance is obtained. In the invention, the counterbalance bulk measurement and the environmental air density measurement are realized integrally, so that the measuring steps are saved, the bulk and air density measuring results are obtained in the same environment, the influence of the environment on the measuring results is small, and the result accuracy is greatly increased.

The present invention provides a unidirectional condenser microphone unit that can suppress the occurrence of howling. In a unidirectional condenser microphone unit, a diaphragm 20 extended across a support ring 21 and a backplate 30 supported by an insulation cylinder 50 are arranged opposite each other via a spacer ring 40. A backside air chamber 31 is provided between the backplate 30 and the insulation cylinder 50. When the density of air is defined as ρ, sound velocity is defined as c, the effective vibration area of the diaphragm 20 is defined as S, and the volume of the backside air chamber 31 is defined as V, a stiffness s1 of the backside air chamber expressed by (ρ×c²×S²)/V is increased on the basis of the volume V of the backside air chamber to shift a resonance frequency of a unidirectional component contained in unidirectivity up to a frequency near a high-frequency reproduction limit.

The invention provides a natural ventilation air-cooling condenser, which belongs to the field of heat exchange, and in particular relates to an air-cooling condenser in an electric power plant taking air as a cooling medium. The conventional air-cooling condenser is high in power consumption, high in investment cost and poor in anti-wind capability. In the design, the air-cooling condenser is designed into a heat exchanging unit component which has a vertical windward side structure and combined with a natural ventilation tower to form the natural ventilation air-cooling condenser of which a heat exchanging component is arranged at the periphery of the lower part of the ventilation tower. Waste steams become water after entering the heat exchanging component and being subjected to heat exchange with the air outside a pipe. The density of the air which absorbs heat is reduced to generate a lift force, so the air ascends to the tower top in the natural ventilation tower and enters the high altitude, and natural circulation of the cold air and the hot air before and after the air-cooling condenser is realized. By the air-cooling condenser having the structure, the investment and the power consumption on a high platform and a fan in the conventional direct air-cooling technology are saved, the problem that the hot air circulation and the heavy wind in the conventional direct air-cooling technology endangers the safety economic operation of the electric power plant is eliminated, and the energy consumption cost of the electric power plant is reduced.

Pore creating material is added to waterproof-breathe freely membrane and catalyse membrane air diffusion pole of zinc air cell. Heating 5-30min under 70-250 deg.C makes thermal decomposition or thermal degradation of pore creating material so as to carry out pore creating for waterproof-breathe freely membrane and catalyse membrane. The pore creating material is carbowax, organic ammonium salt or compound of inorganic ammonium salt. The invention raises quality and discharging current density of air diffusion pole, and raises electrical property of zinc air cell.

An “air-data probe” system measures at least one component of freestream velocity by tracking the motion of a laser-induced breakdown (“LIB”) spark created in a freestream flow. Neutral density filters are positioned or deployed so that the brightness of the initial LIB spark doesn't over saturate the LIB sensor system. This allows for more consistent tracking of the LIB spark throughout the duration of the LIB spark, including the later stages where the LIB spark is not nearly as bright as the initial LIB spark, thereby allowing all or substantially all of the light generated by the LIB spark to reach the sensors. This provides for enhanced visibility and more accurate detection of the LIB spark over time and as air density changes.

A servo writer that writes servo information onto a disk of a hard disk drive. The servo writer can write servo information onto a disk of a hard disk drive while the disk is within an inner chamber of a housing. The rotating disk creates a flow of fluid within the inner chamber. The disk is rotated during the servo writing process. The density of a fluid medium within the inner chamber is controlled by a medium control system so that the density of the medium is less than the density of air at one atmosphere. Lowering the density decreases the amplitude of vibrational forces created by the flow of fluid. Decreasing the amplitude reduces errors in the servo writing process. The density can be reduced by pulling a vacuum within the inner chamber. The density can also be reduced by filling the inner chamber with a gas such as helium that has a lower density than air.

The invention relates to a digital crosswind sensor for monitoring the wind speed and the wind direction of crosswind, comprising a probe, a differential pressure sensor, a temperature sensor, a microprocessor and a signal conversion interface, wherein a differential pressure signal is sensed by the differential pressure sensor according to the air pressure change caused by ambient air flow of a part to be measured, converted into a corresponding air speed value according to a certain formula and transmitted to an upper computer through a signal conversion interface for display; the differential pressure sensor has the advantages of high sensitivity and high measurement precision due to the adoption of a micro-electronic chip; the temperature sensor is used for monitoring ambient temperature changes in real time and further converting the changes into an air density value under a corresponding condition so as to correct the air density value in real time, thereby overcoming the defect that the temperature sensor is greatly influenced by the ambient temperature and has lower measurement precision; the microprocessor has strong vibration and interference resistance by using a digital filtering algorithm; the signal conversion interface has good expansibility; and in addition, the used part is formed by assembling small-packaging low-power consumption electronic devices, and has small size and low power consumption.

The invention relates to a detecting method of a pressure container, in particular to a leakage detecting method of a hydrogen system for a coal-fired power generator. The leakage detecting method comprises the steps of replacing gas; vacuumizing; filling sulfur hexafluoride gas; detecting leakage of the hydrogen system for the generator by a sulfur hexafluoride gas leakage detector and marking the leakage points; and decompressing. The leakage detecting method of the hydrogen system for the coal-fired power generator is combined with the sulfur hexafluoride gas leakage detector to detect the leakage of the hydrogen system for the generator by means of the characteristics of sulfur hexafluoride gas, in particular the characteristic of inertia of the sulfur hexafluoride gas and density of the sulfur hexafluoride gas that is greater than the density of air. Compared with the prior art, the method of the invention is good in safety and has high leakage detection precision, and the sulfur hexafluoride gas after leakage detection can be recycled, thereby reducing the cost of leakage detection.

The invention provides a method for measuring an air density in weight mass measurement and a method for correcting a mass measurement result, which belong to the measurement field. The method comprises the following steps that: parameters of air surrounding a weight are firstly measured, then the air parameters are used for obtaining an air density, the air parameters include temperature, humidity and pressure and also include a content of carbon dioxide (CO2). By adopting a way that a plurality of temperature collecting points and at least two humidity collecting points are arranged inside a wind cap, the temperature and the humidity gradient parameters above a balance in the wind cap are obtained, so an accurate value of the air temperature and the accurate air humidity can be calculated to further obtain an accurate value of the air density; and the measurement of the CO2 content is further added in the method, and the influence factor of the CO2 is considered in the test result, so the test result is more accurate.