48 results about "Volume Curve" patented technology

A system and method for ventilating a lung in a living being by varying the peak inspiratory pressure. The peak inspiratory pressure may deviate about a mean that is chosen to correspond with a knee in a pressure-volume curve of the lung.

An apparatus and method for continuously monitoring selected parameters of reciprocating compressor cylinders is disclosed, the apparatus includes a plurality of sensors positioned to monitor selected parameters within the cylinder on either side of the piston, with the selected parameters including pressures on each side of the piston for each cycle, temperatures of the gas entering and exiting the cylinder, and vibrations of components such as a piston shaft within the cylinder. A calculator means in close proximity to the cylinder receives the signals from the sensors and analyzes the signals for each cycle of the piston. Output signals proportional to the monitored signals are transmitted to a remotely located computer. The output signals include pressure versus volume curves for each cylinder volume, horsepower consumed by the cylinder, inlet suction and outlet discharge gas temperatures of the gases moved through the cylinder, and compression and tension stress on the piston rod. Computer analyses compare monitored signals to pre-selected ranges of operating parameters to provide alarm signals to alert operators of the performance and mechanical conditions within the monitored reciprocating compressor cylinder. A method of operation for continuously monitoring selected parameters of reciprocating compressor cylinders is also disclosed.

The invention provides an automatic marking method for karaok vocal accompaniment. In the method, pitch, beat position and volume of a singer are compared with the original pitch, beat position and volume of the theme of a song to generate tone sensation score, rhythm sensation score and emotion score respectively, so as to obtain weighted total score in a weighted marking method. By using the method, the pitch, beat position and volume error of each section of the song sang by the singer can be exactly worked out, and a pitch curve and a volume curve can be obviously displayed, so that the singer can learn which part is sung incorrectly and which part needs to be enhanced. The invention also has the advantages of dual effects of teaching and entertainment, high practicability and technical advancement.

A fracture-vug type carbonate reservoir water breakthrough early warning method of the present invention relates to an oil well water breakthrough early warning method, and aims to determine the water invasion time timely, optimize a working system, prolong an oil well water-free oil production period, and improve the oil well recovery efficiency. The method of the present invention comprises the following the steps of S01 obtaining the oil pressure drop under different accumulative liquid volumes according to a matter balance equation, and drawing a relational graph of the oil well pressure drop and the accumulative liquid volume; S02 for the non-water breakthrough reservoir, if a oil well pressure drop and accumulative liquid volume curve deviates, explaining three possible phenomena: (1) the crude oil is degassed in a shaft or stratum; (2) a new reservoir is exploited; (3) the edge-bottom water begins to invade; S03 excluding the two situations that the crude oil is degassed in the shaft or stratum and the new reservoir is exploited to determine that the reservoir edge-bottom water begins to invade; S04 determining the water invasion time according to the relational graph of the oil well pressure drop and the accumulative liquid volume, and carrying out the water breakthrough early warning.

The invention discloses an extraction method for a reservoir characteristic curve based on a spatial information technology. The method comprehensively applies RS, GIS and GPS techniques and a digital elevation model. The method comprises the following steps: extracting a characteristic curve in a dead water level-normal pool level elevation scope based on remote-sensing image water information extraction and a GIS drawing technique, and extracting a characteristic curve in a normal pool level-maximum flood level elevation scope based on a GPS topographic surveying technique and a multi-source spatial data topography modeling technique. Compared with the present reservoir characteristic curve acquiring technique, the method disclosed by the invention has the advantages that a level-area and level-volume curve above the dead water level of the reservoir can be quickly, efficiently and accurately acquired, and the cost is low. Specific to the running reservoir, the method can conveniently check the original reservoir characteristic curve and has significance in reservoir flood preventing and power generation dispatching.

A process, system and device are provided for automatically recording pressure-vs.-volume curves during artificial respiration with a respirator. The inspiration pressure is increased during the supply of a breathing gas volume flow under the control of a control unit. The resulting breathing gas volume flow rate is detected and the volume is determined from the latter by integration. The control unit compares the breathing gas volume flow detected during the phase of expiration with a preselected set point and acts on an expiration valve (12) in the expiration line (8) by means of a controller in case of deviation from the set point in order to return the breathing gas volume flow to the set point.

The invention provides a method for matching the particle size of elastic microspheres used for profile controlling and flooding of an oil reservoir deep part with a pore throat. The method includes the steps that an oil reservoir pore throat diameter distribution parameter is obtained; according to the diameter of the pore throat, a diameter-variable pipe with the diameter same as that of the pore throat, and the breakthrough pressure and deformation migration ability of the elastic microspheres with a certain initial particle size in the diameter-variable pipe under the different-expanded-ratio conditions are measured; through a nuclepore membrane experiment, the filtering time and filtering volume of the elastic microspheres with a certain particle size are obtained after the elastic microspheres pass through nuclepore membranes different in pore diameter; a filtering-time and filtering-volume curve is drawn, and the matching range of the particle size of the microspheres obtained by the deformation migration of the elastic microspheres into one nuclepore membrane with the diameter of the pore throat, the elastic microspheres with corresponding particle size are selected, and profile controlling and flooding of deep part is designed and implemented. According to the method for matching the particle size of the elastic microspheres used for profile controlling and flooding of the oil reservoir deep part with the pore throat, by effectively blocking off the oil reservoir pore throat, the expansion of the water flooding sweep range is achieved, the temperature resistance, salt tolerance and block-off effects are good, the block-off effect of the deformation migration of the elastic microspheres are given play to, and no damage is caused to a reservoir.

The invention is directed method for measuring respiration using impedance pneumography over a duration of at least several minutes, several hours or over the duration of night sleep, the method comprising: using at least one electrode (11) configured to be in contact with an arm (2) of a human body (1) and at least one electrode (22) configured to be in skin contact with the thorax of a human body (1); defining impedance signal changes which relate to the respiratory volume changes or time-differentiated impedance signal changes which relate to the respiratory flow; and analysing variation over time in flow-time, volume-time, flow-volume curves, or derived numerical indices, or plain respiratory impedance signal or its time derivate over the duration of at least several minutes, several hours or over the duration of night sleep.

[Object] To provide a polypropylene resin composition for use in the formation of a microporous membrane having excellent heat resistance and low thermal shrinkage ratio.

[Solution] A polypropylene resin composition for use in the formation of a microporous membrane according to the present invention comprises as an essential component a propylene homopolymer (A) that satisfies the following requirements (1) to (4) and (7):

• • (1) the intrinsic viscosity [η] is 1 dl/g or more and less than 7 dl/g; (2) the mesopentad fraction ranges from 94.0% to 99.5%; (3) the integral elution volume during heating to 100° C. is 10% or less; (4) the melting point ranges from 153° C. to 167° C.; and (7) in an elution temperature-elution volume curve, the maximum peak has a peak top temperature in the range of 105° C. to 130° C. and a half-width of 7.0° C. or less.

The invention provides a volume adjusting method, a mobile terminal and a computer readable storage medium. The volume adjusting method comprises the steps of: when a terminal plays audio, collectingcurrent environment audio by using a microphone correlated with the terminal and determining the environment volume corresponding to the environment audio; searching for the output volume corresponding to the current environment volume from a pre-stored volume curve table according to a preset mapping relationship between environment volume and output volume; adjusting the current audio volume ofthe terminal according to the found output volume so that the terminal can play audio according to the adjusted audio volume. The method can adjust volume according to output volume corresponding to current environment volume, so that volume can be adjusted according to environment volume without manual operation of users, and the convenience and intelligence of volume adjustment are improved.

A fuel system for an internal combustion engine includes at least one first fuel pump and a pressure region into which the fuel pump pumps and which communicates with an elastic volume reservoir. The elastic volume reservoir has a characteristic pressure/volume curve, which is defined by at least two points. It is proposed that a first point is defined by a first volume at a first pressure that is somewhat greater than a vapor pressure of the fuel at ambient temperature, and that a second point is defined by a second volume and a second pressure in the pressure region that corresponds to a maximum pressure; the difference between the first and second volumes corresponds at least approximately and at least to a value by which the volume of the fuel in the pressure region decreases upon cooling down from a maximum temperature to ambient temperature.

The invention provides pellets of a saponified ethylene-vinyl acetate copolymer which are excellent in feedability, cause little fluctuation of extruder torque or discharge during molding, and yield shaped articles with high dimensional accuracy such as the high accuracy of form and thickness. The pellets of the invention are such that the differential curve representing the magnitude of change in the cumulative pore volume curve generated by measuring the fractional volume of surface pores by the mercury intrusion method has no peak within the pore diameter range of 1x102~1x104 Å.

The present invention is related to a magnesium oxide particle aggregate with the requirement of a first inflection point diameter is more than 0.30×10⁻⁶ to 0.60×10⁻⁶ m, a particle void volume is 0.50×10⁻³ to 0.90×10⁻³ m³·kg⁻¹, and a micropore volume is 0.04×10⁻³ to 0.11×10⁻³ m³·kg⁻¹ in the cumulative intrusion volume curve of said particle by having controlled particle aggregation structure so that the solid phase-solid phase reaction between magnesium oxide and the SiO₂ film on the surface can be appropriately controlled.

An object of the present invention is to provide a magnesium oxide particle aggregate having a controlled particle aggregation structure so that the solid phase-solid phase reaction between magnesium oxide and the SiO2 film on the surface can be appropriately controlled. The object can be achieved by a magnesium oxide particle aggregate characterized in that a first inflection point diameter is 0.30 x 10<-6> m or less, an interparticle void volume is 1.40 x 10<-3> to 2.20 x 10<-3> m<3>/kg and a particle void volume is 0.55 x 10<-3> to 0.80 x 10<-3> m<3>/kg in a cumulative intrusion volume curve of the particle aggregate.

A laryngeal mask airway (LMA) device includes an inflatable annular cuff, which, when disposed in free space, is characterized by a pressure-volume curve that represents the pressure in the cuff when inflated, from a deflated negative pressure, by different volumes of ambient-pressure air, which include a low-pressure volume that results in a low pressure of 10 cm H2O. The pressure-volume curve includes (a) a low-pressure-range average rate of change over a low-pressure volume interval between 1.0 and 1.2 times the low-pressure volume, (b) a medium-pressure-range average rate of change over a medium-pressure volume interval between 2.0 and 2.2 times the low-pressure volume, and (c) a medium pressure at a medium volume of the cuff equal to 2.0 times the low-pressure volume. The medium-pressure-range average rate of change is less than 0.5 times the low-pressure-range average rate of change, and the medium pressure is between 20 and 200 cm H2O.

The invention discloses a foundation settlement observation method. The foundation settlement observation method is characterized by observing the whole ballast bed region by adopting a mode that a stack loading mode is combined with a settlement observation plate and a multi-point displacement meter; an embedding method of the multi-point displacement meter comprises the following steps: drilling and embedding after carrying out accurate survey setting out in a survey point position; placing a PVC (Polyvinyl Chloride) pipe, a PVC joint and a single-point settlement unit in the opening of a hole in sequence according to an installation sequence, and threading a pulling rope; installing the PVC pipe, the PVC joint and the single-point settlement unit through which the pulling rope is threaded in the hole in sequence, and firmly connecting by using screws. According to the foundation settlement observation method disclosed by the invention, the whole ballast bed region is observed by adopting a mode that the stack loading mode is combined with the settlement observation plate and the multi-point displacement meter, curve-fitting prediction post-construction settlement is carried out according to an earth filling height-time-settlement volume curve graph, the settlement volumes of different earth filling regions can be determined, the observation is accurate, the foundation settlement observation method is used for guiding the design and the construction, so that reasonable engineering measures are ensured, and the investment is economical.