A blood coagulation test device includes: a container into which a test-object blood is placed; a stirring part for stirring the test-object blood in the container; an elastic body being connected to the stirring part and capable of deforming in response to a force received through stirring of the test-object blood from the stirring part; a control unit for transmitting a predetermined rotary motion to the stirring part and causing the stirring part to rotate in a reciprocating manner in a circumferential direction by rotating the elastic body in a reciprocating manner about an axis of the stirring part as a rotation axis and controlling the reciprocating rotation at a position separated by a predetermined diameter from the rotational axis; and a measurement unit for measuring a rotation angle pertaining to the reciprocating rotation of the stirring part.

Provided are a method and device for improving a response speed in a measurement of viscosity of a fluid and obtaining a continuous smooth measurement graph. A viscometer includes a machine part that generates a shear rate in a sample, a machine drive, a shear rate changing means that outputs a target shear rate of the machine part, and a displacement detection sensor that measures displacement of the machine part, and performs feedback control to control a driving force of the machine drive so that an output value of the displacement detection sensor corresponds to the target shear rate and measures a viscosity of a sample, wherein a feedback gain is simply set for each measurement according to an optimum design or target shear rate.

An apparatus for measuring blood coagulation data, and a use method and calibration method thereof are disclosed. The apparatus comprises: a movable support part (101), a fixed support part (102), a connection part (103), a rotary shaft (104), a magnet (105), a Hall element (106), and a processing unit (107). One end of the movable support part (101) is fixedly connected to the rotary shaft (104), and the other end of the movable support part (101) is connected to the fixed support part (102) by means of the connection part (103); the movable support part (101) is fixedly connected to the magnet (105); the rotary shaft (104) is able to rotate relative to the fixed support part (102) under the driving force of measured blood and drive the movable support part (101) to rotate; the movable support part (101) is able to move the magnet (105) to cause a change in the magnetic field of the magnet (105); the Hall element (106) is connected to the processing unit (107); the Hall element (106) is used for outputting a measurement electric signal according to the magnetic field change of the magnet (105); and the processing unit (107) is used for determining blood coagulation data of the measured blood according to the measurement electric signal. The present apparatus can improve the accuracy in measurement of blood coagulation data.

The invention relates to a process for determining the degree of branching of modified polymers wherein the polymers are modified in the sense that their degree of branching after polymerization was increased once more, wherein the modified polymers are treated with a polar transformation mixture comprising a compound of general formula (I)
R.sup.1SSR.sup.1 (I)
wherein the Mooney viscosity (ML 1+4 at 100? C.) of the polymers is determined before and after the treatment with the polar transformation mixture and the degree of branching is determined.

A fluid density measurement device (8) that includes a housing (54), defining a chamber (18) and an aperture; a resonator (10) having length that is at least 5 times greater than its smallest diameter and having a longitudinal axis and a nodal plane, transverse to the longitudinal axis. The resonator further includes tube (44) having a first end and a second end; a second-end closure (52), closing the second end; and a drive rod (48) centrally attached to the second-end closure and extending to the tube first end. Further, the device includes a resonator transducer assembly (22) and the resonator is sealingly joined to the aperture at the nodal plane, so that an enclosed portion (10A) extends into the chamber and an exposed portion (10B) extends outside of the chamber, and wherein the chamber tends to assume the temperature of the exposed resonator portion, causing the resonator to be isothermal.

A method and a device for the measurement of one or more fluid-mechanically effective parameters of a fluid, with a fluid pump which comprises a delivery element which is mounted in a magnet bearing, and the delivery element of the fluid pump is excited into an oscillation by way of an excitation device, wherein the oscillation parameters as well as, as the case may be, the oscillation behaviour is measured, and parameters of the fluid are determined from this.

The present application relates generally rheometers. In one aspect, misalignment of the air cylinder with respect to the cross-head is accommodated using a flexible coupling between the air cylinder and the cross-head so as to prevent binding and stuttering of the machine due to misalignment.

Apparatuses and methods are disclosed for the analysing of non-Newtonian fluids and determining parameters to characterise the relationship between shear stresses and shear rates, i.e. the parameters of one or more rheological models of viscosity. A plurality of viscosity measurements are made in a fluid using one or more vibratory transducers operating at a plurality of frequencies. Parameters for the fluid are determined based on the measured viscosity values and the frequencies of vibration at which the viscosity measurements were obtained.

Measuring device for measuring an elasticity and a viscosity of a medium, having a first measuring device part having a volume for receiving the medium to be measured, and a second measuring device part that protrudes into the volume, wherein the first measuring device part in relation to the second measuring device part is sealed by way of a gas flow seal, and wherein the first measuring device part in relation to the second measuring device part is movable in a rotating movement about a predefined axis.

A method and a device for the measurement of fluid-mechanically effective parameters of a fluid, with a fluid pump which comprises a delivery element (2) which is mounted in a magnet bearing (10, 10a, 11, 11a), according to the invention, envisages the delivery element (2) of the fluid pump being excited into an oscillation by way of an excitation device (16, 44), wherein the oscillation parameters as well as, as the case may be, the oscillation behavior is measured, and parameters of the fluid are determined from this.