107 results about "Gas constant" patented technology

A leak tester which detects leakage of a gas from a measured object, the leak tester including a source of a pressurized gas which supplies the pressurized gas, a differential pressure detecting section which detects a pressure difference between the pressure of a gas in the measured object and the pressure of a pressurized gas supplied by the source of the pressurized gas, and a pressure adjusting section which makes the pressure of the pressurized gas supplied by the source of the pressurized gas constant.

An internal exhaust gas recirculation amount estimation system calculates an in-cylinder temperature at an exhaust valve closure timing, an in-cylinder pressure at the exhaust valve closure timing, and a gas constant corresponding to a change in a composition of exhaust gas, based on an air-fuel mixture ratio. An exhaust valve closure timing in-cylinder residual gas amount is calculated based on at least the in-cylinder temperature, the in-cylinder pressure, and the gas constant. Also calculated is a valve overlap period blow-back gas amount, which is defined as a quantity of gas flow from one of intake and exhaust ports via a combustion chamber to the other port during a valve overlap period. An internal exhaust gas recirculation amount is calculated based on the exhaust valve closure timing in-cylinder residual gas amount and the valve overlap period blow-back gas amount.

A fluid supply apparatus with a plurality of flow lines branching out from one regulator for adjustment of pressure, the flow lines being arranged in parallel, wherein a measure is taken that the operation, that is, opening or closing of one flow passage will have no transient effect on the steady flow of the other flow passages. For this purpose, each flow passage is provided with a time delay-type mass flow controller MFC so that when one closed fluid passage is opened, the mass flow controller on that flow passage reaches a set flow rate Qs in a specific delay time DELTAt from the starting point. Also provided are a method and an apparatus for the above in which a plurality of gas types can be controlled in flow rate with high precision by one pressure-type flow control system. To that end, a formula for calculating the flow rate of a gas is theoretically derived that flows with a pressure ratio not higher than the critical pressure ratio. From that formula, the flow factor is defined, so that the formula may be applied to a number of gas types using flow factors. The method includes calculating the flow rate Qc of a gas passing through an orifice according to formula Qc=KP1 (K=constant) with a pressure P1 on an upstream side of the orifice set at twice or more higher than pressure P2 on a downstream side, wherein the flow factor FF for each kind of gas is calculated as follows: <paragraph lvl="0"><in-line-formula>FF=(k/gammas){2/(kappa+1)}1/(kappa-1)[kappa/{(kappa+1)R}]½</in-line-formula>and wherein, if the calculated flow rate of gas type A is QA, and, when gas type B is allowed to flow through the same orifice under the same pressure on the upstream side and at the same temperature on the upstream side, the flow rate QB is calculated as follows: <paragraph lvl="0"><in-line-formula>QB=(FFB/FFA)QA </in-line-formula>where gammas=concentration of gas in standard state; kappa=ratio of specific heat of gas; R=constant of gas; K=proportional constant not depending on the type of gas; FFA=flow factor of gas type A; and FFB=flow factor of gas type B.

The invention relates to a coal bed gas high pressure desorption meter, while the prior coal bed gas high pressure constant temperature adsorption instruments utilizes coal powder samples to test coal bed gas constant temperature adsorption parameters, and the coal bed gas desorption test generally utilizes normal-pressure desorption instruments, to test the parameters of drilling well coal core, such as coal bed gas content and adsorption time and the like. The coal bed gas high pressure desorption meter comprises an automatic temperature control water bath apparatus, a stainless steel mechanical device, and an image and pressure data acquisition system, wherein the stainless steel mechanical device comprises a gas collection cylinder, a sample cylinder, a gas regulation cylinder, a frame, a high pressure pipeline and a valve, the cylinder is fixed on the frame, the frame and the cylinder are arranged in the automatic temperature control water bath device, and the frame is connected with a lifting machine. The invention can effectively simulate reservoir bed conditions and discharge-mining working systems, realize the switch between gas-solid two-phase system and gas-liquid-solid three-phase system under high pressure condition, the desorption, gas collection and measurement processes under high pressure water injection conditions, effectively observe the desorption of coal bed gas, and test the parameters such as desorption pressure, desorption quantity and lost gas quantity and the like.

A high-performance proton exchanging film fuel battery system flow which is used in vehicle and ship includes fuel battery, air system flow, hydrogen gas system flow and cooling part flow. The air system flow element includes: air filter, air supply arrangement (direct current speed governing fan or air compressor), air damp conversion device equipped with water separater, radiator; the hydrogen gas system flow includes: high-pressure hydrogen gas tank, normally closed two-position two-way solenoid valve, hydrogen gas high-pressure decompressor, hydrogen gas constant pressure arrangement, hydrogen gas humidifying device, hydrogen gas reflux pump, hydrogen gas water separater, two-position three-way solenoid valve; the cooling system element includes: water tank, direct current speed governing pump and radiator. The structure of the invention is simple, the efficiency is high, service life is long, and it fits for proton exchanging film fuel battery system flow which is used in vehicle and ship.

A cellulose acetate propionate film has a density νe of entanglement points of a polymer chain of cellulose acetate propionate represented by the following expression (A) of from 0.3 to 2.0 moles/dm³:

νe=E_R′/3RT_R   (A)

wherein R represents a gas constant; E_R′ represents a storage elastic modulus in a rubbery state plateau upon measurement of a dynamic viscoelasticity; and T_R represents a temperature in the rubbery state plateau.

An aspect of the invention provides a method for operating a workable homogeneous charge compressed ignition engine in which a compression ignition operation is performed by spark ignition to shorten a load input time and a load cutoff time. In the homogeneous charge compressed ignition engine operating method, a mixture gas is burned by compression ignition in a combustion chamber, and fuel and air are previously mixed to produce the mixture gas. The homogeneous charge compressed ignition engine includes a spark ignition device 53 which performs spark ignition to the mixture gas. A temperature controller 35 substantially keeps an intake air temperature of the mixture gas constant. A spark ignition operation, a spark-assist compression ignition operation in which spark ignition is supplementarily used, and a non-spark compression ignition operation in which the spark ignition is not used are switched according to magnitude of a load.

The invention relates to an ultrasonic coal wall temperature measurement method and a device thereof. An ultrasonic sensor is arranged at a designated point of a coal mine, a single-chip microcomputer circuit is utilized to control the ultrasonic sensor to transmit ultrasonic signals, and the sensor also receives the reflected signals and triggers the external interrupt of a single-chip microcomputer by an ultrasonic receiving circuit to obtain the time of flight of the ultrasonic signals between the round trip. On the premise of knowing the coal wall distance, data are processed by the single-chip microcomputer according to a gas constant and an adiabatic exponent of the signal flight environment to obtain the measurement result of the coal wall temperature, and the result is displayed by a digital display. The measurement device is composed of the ultrasonic sensor, the single-chip microcomputer circuit, the ultrasonic transmitting circuit, the ultrasonic receiving circuit and the digital display. The ultrasonic sensor is connected with the ultrasonic transmitting circuit and the ultrasonic receiving circuit simultaneously, an external interrupt port of the single-chip microcomputer circuit is connected with the ultrasonic receiving circuit, and an output interface of the single-chip microcomputer circuit is connected with the digital display.

A gas delivery system, having a gas identification, by which a gas supplied to the gas delivery system is identified, a blender, blending oxygen and the gas to provide a gas mixture with an oxygen flow rate set up by an operator, and at least one flow sensor, to measure a flow rate of the gas mixture. The blender is driven by an actuator motor to various blender positions with the blender positions being calibrated based on the specific heat ratio and the gas constant of the gas. The flow sensor can be installed at the inspiratory circuit, the proximal circuit and the expiratory circuit of the gas delivery system. The flow sensor output is corrected based on the actual conditions, including the temperature, pressure and humidity, and characteristics of the gas mixture.

The present invention provides a soldering inhibitor composition and condensate thereof, which has excellent developing performance, excellent resolving capability, excellent heat-resisting quantity and excellent resistance to plating needed by a pc board, a package substrate, a module base plate necessarily, and can provide a base plate with little curing shrinkage and no-warp.The soldering inhibitor composition is characterized in that: the solidified crosslink density computed by formula (1) being 2*103-1.2*104mol/m3, and glass transition temperature being more than 100 EDG C, n=E' min/3 PhiRT(1).In the formula, n being crosslink density, E' min being minimum value of the storage elastic modulus E', Phi being modified coefficient approximate 1, R being gas constant, T being absolute temperature of E' min.

The invention relates to an experiment device and method for the gas adsorption and desorption of large rock samples with different sizes. In the experiment device, a gas cylinder is communicated with a gas constant-pressure device, the gas constant-pressure device and a vacuum-pumping device are merged and connected to a main pipeline through a three-way valve, and the main pipeline is communicated with a gas inlet of a core holding unit through a core holding unit inlet valve; the core holding unit is arranged in a constant-temperature heating device; and a metering pump is connected with the core holding unit, and applies surrounding rock and axial compression to core samples in a core holding unit sample chamber. The experiment device not only implements the experiment requirements, but also achieves the effects of simple structure, low cost and easy operation; and when the experiment device is adopted for carrying out experiments, experiment results are more accurate and closer to the adsorption desorption of actual rock masses, and gas adsorption and desorption experiments of cores under the conditions of different sizes, different temperatures and different pressures can be performed in one experiment device.

The invention discloses a method for measuring the circulation area of complex profile hole, main contents of which are that the air pressure P₁^* in front of the workpiece profile hole to be measured is adjusted to the supercritical pressure ratio, namely not less than 2 times of atmospheric pressure P_o in order to ensure that air passes through the profile hole at a critical speed, and the air after further expansion is discharged into the atmosphere through an exhaust pipe. Measuring the air pressure P₁^* in front of the profile hole, the air temperature T₁^* and the air flow Ga through a pipeline, calculating the coefficient m of the air through the air adiabatic index K and the gas constant R, and substituting these data into the flow equation of compressible flow to calculate the circulation area of the complex profile hole to be measured. Compared with the prior art method of measuring the area of the profile hole with the air power, the method disclosed by the invention, which measures the circulation area of the complex profile hole with the supercritical pressure ratio, has the advantages of the high measurement precision, the large measurement range, the strong commonality of a measuring device and the convenient operation, and solves the problem of precise measurement of the circulation area of the complex profile hole with the small circulation area.

The invention relates to an in-situ test system and method while drilling for coal seam gas content in an underground coal mine, and belongs to the technical field of coal mine safety. The in-situ test method while drilling comprises the steps that a special coring drill bit is connected with a coal core storage tube, and then connected with a special drill pipe and connected with a clamping device on a drilling rig; high-pressure water or compressed air is connected with a tail drill pipe through a special water tail, in the drilling process, the drill bit is replaced without removing the drill pipe, the coal core is directly drilled, and the coal core is cooled by the cold air, so that the internal moisture of the coal core is solidified, and gas dissipation of the coal core is prevented; and the coal core is sent to a laboratory, after the temperature of the coal core is raised, the solidified moisture is converted into a liquid state, the gas dissipates from the coal core storage tube, the natural gas content and the gas content after pulverization in the coal core storage tube are measured, and the gas content of the coal seam is calculated by combining industrial analysis, porosity and adsorption gas constants.

The invention relates to a gas constant ultra-low density transmission, purification, pressuring and generation device, which comprises a gas constant ultra-low density bank connecting the gas outlet. Wherein, the gas constant ultra-low density bank via the air adsorption control valve is connected to the air adsorption tube; the gas outlet of gas constant ultra-low density bank is connected to the compressor of dual-channel pressuring device; the upper channel of compressor is connected to the gas inlet tube of motor; and the lower channel of compressor via the gas inlet control valve is connected to the gas constant ultra-low density bank. The invention uses the under-well air and the reflux rare gas to adjust the gas density to under the burning point. It has safe transmission and via the dual-channel pressuring device, the gas has been purified before entering the motor and the density is high than 16%. And the gas is mixed inside the cylinder, than enters the motor to be burned to confirm the safe operation.

In a processing apparatus, a process gas including a source gas (TiCl₄, NH₃) and an inert gas (N₂) is supplied into a process chamber (2). A pressure meter (6) detects a pressure in the process chamber (2) so as to control an amount of flow of the process gas supplied to the process chamber (2) based on a result of the detection. A source gas is purged by the inert gas. By maintaining the amount of flow of the source gas constant and controlling the amount of flow of the inert gas, an amount of flow the entire process gas is controlled so as to maintain a pressure in the process chamber (2) constant. Since a time spent on evacuation of the source gas is reduced, a time for switching the source gas is reduced. Additionally, a temperature of a surface of a substrate during processing can be maintained constant.

Method for determining a temperature in a pressurized flow path of a gas turbine (10) comprising the steps of sending an acoustic signal from an acoustic signal emitting transducer (20, 21) across a section of the pressurized flow path, detecting the acoustic signal with a receiving transducer (20, 21), measuring the time needed by the acoustic signal to travel from the acoustic signal emitting transducer (20, 21) to the receiving transducer (20, 21), calculating the speed of sound, and calculating the temperature as a function of the speed of sound, the heat capacity ratio (kappa) and a specific gas constant (R spec ) of the gas flowing in the pressurized flow path. Gas turbine with a processor and transducers arranged to carry out such a method is disclosed.

The method involves measuring values of pressure and absolute temperature inside a free space (60) of a thermal insulation layer (6) at two instants during closing of inert gas i.e. nitrogen, intake and discharge valves (601, 602) or stable usage conditions of an insulated storage tank (20) e.g. membrane tank, to calculate layer's average pressure and temperature. Actual porosity of liquid/gas proof barrier is calculated based on specific formula comprising parameters such as rate of change of pressure inside the space, volume of the space, molar mass of inert gas and perfect gas constant.

An internal EGR control device for an internal combustion engine, which is capable of properly controlling an internal EGR amount, while causing conditions of burned gases to be reflected thereon in controlling the internal EGR by changing valve-closing timing of an exhaust valve. An internal EGR control device sets a target internal EGR amount EGRINCMD as a target of the internal EGR amount according to detected operating conditions of an internal combustion engine, and a target internal EGR amount EGRINC is determined by correcting the target internal EGR amount based on a gas state equation, using obtained temperature and pressure of exhaust gases, and a calculated gas constant R. Then, according to the corrected target internal EGR amount EGRINC, the valve-closing timing of an exhaust valve is calculated, and a variable valve mechanism is controlled based on the calculated valve-closing timing of the exhaust valve.

The invention discloses an instrument for analyzing active calcium in a calcium-series auxiliary agent for steelmaking; the instrument comprises a reaction system device, a measuring system and a sealing liquid system device, and is characterized in that a controllable sampling rod in a reaction system can be used for controlling the reaction speed of a sample and a solution, and the sealing property is good; a gas burette has a double-layer structure, thus being good in thermostatical effect and eliminating the influence of environment to gas volume; the gas burette has two reading ways due to two scale units; and the bottom of a leveling bottle in the sealing liquid system is provided with an overflow hole, so that reverse acting force influence to the gas volume caused by the discharged liquid stored in the leveling bottle can be eliminated, and the accuracy of gas volume measurement is guaranteed. Furthermore, the instrument is also used for series experiments such as molar gas constant determination and the like of physics and chemical laboratories in colleges and universities; and the instrument has the characteristics of being wide in applicability, easy to popularize in the metallurgical industry, low in analysis cost, simple, convenient and rapid to operate, etc.

The invention discloses a simulation device of condensate gas constant volume depletion in a dense porous medium and an experiment method. The device comprises a constant volume condensate gas reservoir module, a pressure supply module and an oil and gas separation module, wherein in the constant volume condensate gas reservoir module, a core to be tested is placed in a constant volume full diameter kettle, an end cap is provided with an inlet hole, an outlet hole and a pressure monitoring hole, and a first connecting pipe line is connected to the inlet hole and a center of a circle of a bottom surface of the core to be tested; the pressure supply module includes a constant pressure constant speed displacement pump which is connected to one ends of a condensate gas intermediate container and a high pressure separator gas intermediate container, and the other ends of the condensate gas intermediate container and the high pressure separator gas intermediate container are connected to the inlet hole through the first connecting pipe line; and the oil and gas separation module includes a back pressure pump, a back pressure valve, an oil and gas separator and a gas meter which are connected successively, and an inlet end of the back pressure valve is connected to the outlet hole through a second connecting pipe line. The device and the method have advantages that changes of an oil and gas phase in a depletion process of a condensate gas reservoir in fractured tight reservoir can be simulated, and an oil and gas state under a condensate gas reservoir condition can be maximumly restored.

The invention relates to a gas constant pressure capacity tester used for hydride quantitative analysis. The gas constant pressure capacity tester includes a constant pressure controller, a comb tube, graduated tubes, a constant pressure funnel and a reaction container. Specifically, the comb tube includes an upper comb tube and a lower comb tube that are vertically symmetrical and are connected by the graduated tubes. The upper comb tube and the lower comb tube are respectively connected to the constant pressure funnel and the constant pressure controller. The constant pressure funnel and the reaction container are in sealed connection so as to form a sealed system. The gas constant pressure capacity tester provided in the invention has the advantages of easy manufacturing, high accuracy, convenient operation, and good repeatability, etc., and can make a hydride quantitative analysis method simple, accurate, and rapid.

The invention discloses an absolute water potential calculation method suitable for grain condition monitoring. The absolute water potential calculation method comprises the following steps that: temperature and humidity measurement devices are arranged at multiple measurement points in the granary space so as to acquire the temperature value t and the humidity value M of the grain of the measurement points; and the absolute water potential value E<g> of the grain of each measurement point is calculated: E<g>=RT<alpha>ln(EAH<g>)=[8.31x(t+273)xln(EAH<g>x133.3)]/18, wherein R is the universal gas constant 8.31J/Mol, T<alpha> is absolute temperature of the grain, and EAH<g> is the balance absolute humidity value of the grain and the unit is mmHg. The invention also provides an absolute water potential cloud atlas generation method suitable for grain condition monitoring. The absolute water potential values of multiple prediction points on a prediction section are calculated by using an interpolation algorithm based on the absolute water potential value E<g> of the grain of the measurement points; and an absolute water potential cloud atlas on the prediction section is drawn. The moisture and thermodynamic parameters of the grain bulk are fused to obtain an absolute water potential field and form the cloud atlas so that multiple complex physical fields of the grain bulk can be integrated in one atlas to be expressed in a unified way, and thus analysis of the current state of the grain bulk and the historical evolution rule is facilitated.