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833 results about "Specific volume" patented technology

In thermodynamics, the specific volume of a substance is the ratio of the substance's volume to its mass. It is the reciprocal of density and an intrinsic property of matter as well. Specific volume is defined as the number of cubic meters occupied by one kilogram of a particular substance. The standard unit is the cubic meter per kilogram (m³/kg). v=V/m=ρ⁻¹ Specific volume for an ideal gas is also equal to the gas constant (R) multiplied by the temperature and then divided by the pressure multiplied by molar mass of that ideal gas.

Method and apparatus for determining the hematocrit of a blood sample utilizing the intrinsic pigmentation of hemoglobin contained within the red blood cells

A method for determining the hematocrit of a blood sample is provided that includes the steps of: 1) depositing the sample into an analysis chamber operable to quiescently hold the sample for analysis, the chamber defined by the interior surfaces of first and second panels and a height extending there between, wherein both panels are transparent, and the height is such that at least some of the red blood cells within the sample contact both interior surfaces of the panels and one or more lacunae within the quiescent sample extend between the interior surfaces; 2) imaging at least a portion of the quiescent sample, which sample portion contains the red blood cells and one or more lacunae to determine an optical density of the imaged portion of the sample on a per image unit basis; 3) selecting and averaging the optical density values of the image units aligned with the red blood cells contacting the interior surfaces, and assigning an upper boundary value of 100% to the average optical density value of those image units; 4) selecting the optical density values of the image units aligned with the one or more lacunae, and assigning a lower boundary value of 0% to the optical density values of those image units; and 5) determining the hematocrit of the sample by assigning relative values to the optical density value of each image of the imaged sample portion as a function of the upper and lower boundary values, and averaging the relative values.
Owner:ABBOTT POINT CARE

Method and device for monitoring radio-frequency exposure in a magnetic resonance measurement

In a method and device for monitoring the physiologically effective radio-frequency exposure in at least one specific volume region of an examination subject in a magnetic resonance data acquisition scan in a magnetic resonance system, the magnetic resonance system having a radio-frequency antenna structure with a number of individually controllable radio-frequency signal channels for generation of radio-frequency field distributions in an examination volume including the examination subject, amplitude values are acquired that respectively represent, at specific acquisition points in time, a signal amplitude of the radio-frequency signals emitted or to be emitted via the radio-frequency signal channels in the course of the magnetic resonance measurement. Also, phase values are acquired that represent the phases of the appertaining radio-frequency signals at these points in time. Local exposure values are then determined on the basis of the amplitude values and phase values, these local exposure values respectively representing a physiological exposure that the radio-frequency pulses cause at the examination subject at a specific location at a specific time. Based on this, exposure control values are determined that are compared with predetermined exposure limit values. When an exposure limit values is reached or exceeded, a control signal is output.
Owner:SIEMENS HEALTHCARE GMBH

Powder metallurgy tantalum powder and/or niobium powder and preparing method thereof

The invention provides a preparing method of powder metallurgy tantalum powder and/or niobium powder. The method comprises the steps that (1) heat treatment sintering is conducted, wherein heat treatment sintering is conducted on raw tantalum powder and/or the niobium powder and after sintering is accomplished, cooling is conducted and then passivation is conducted so that a sintered block can be obtained; (2) hydrogenation and powder preparation are conducted, wherein the sintered block obtained through heat treatment is hydrogenated and powder is prepared so that the hydrogenated tantalum powder and/or the hydrogenated niobium powder can be obtained; (3) dehydrogenation and oxygen reduction are conducted, wherein reducibility metal is added to the hydrogenated tantalum powder and/or the niobium powder so that dehydrogenating and deoxygenating heat treatment can be conducted, and therefore a mixture of reducibility metallic oxide, residue reducibility metal, dehydrogenated and deoxidized tantalum powder and/or the niobium powder can be obtained; (4) acid pickling and impurity removal are conducted, wherein acid pickling and drying are conducted on a mixture obtained through dehydrogenation and oxygen reduction so that the tantalum powder and/or the niobium powder suitable for powder metallurgy can be obtained. The method is suitable for recycling and treating the waste tantalum powder and/or the niobium powder generated in the process of production of the high-specific-volume tantalum powder and/or the niobium powder for a capacitor so that the tantalum powder and/or the niobium powder suitable for powder metallurgy can be prepared, investment of needed devices is small, the adaptive capacity to raw materials is strong, the technological process is short, and the safety coefficient of the treatment process is high.
Owner:NINGXIA ORIENT TANTALUM IND
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