A measuring device, in particular a measuring device of the type of a rheometer, and a method determines properties of a viscoelastic material, which has been introduced or can be introduced into a temperature-regulated sample space between an upper chamber half provided with a sensor and a lower chamber half that can be rotated relative to the upper chamber half. The lower chamber half is driven or can be driven by a motor and is connected with at least one slip ring (that creates an electric path into the interior of the sample space on the lower chamber half, so that the lower chamber half can be rotated, with reference to the upper chamber half, about an angle of rotation over 360°.

A performance evaluation method for elastic material including rubber or elastomer, the method includes a step of applying a strain to a test piece made of the elastic material to form at least one void inside the test piece, a step of obtaining projected images of the test piece by irradiating the test piece with X-rays at a plurality of times after the at least one void is formed, and a step of obtaining a volume change of the at least one void between the plurality of times based on the projected images, as one of indexes of performance.

A viscometer for inline determination of the viscosity of a fluid includes a drive device and a measuring device including a housing and a chamber. The drive device includes a housing in which a stator is arranged. The stator has and having a plurality of coil cores delimited by an end face, and carrying a concentrated winding, and being a bearing and drive stator with which the rotor is magnetically driven without contact and magnetically levitated without contact with respect to the stator. A control device actuates the stator and determines the viscosity based on an operating parameter of the electromagnetic rotary drive.

A viscosity measurement unit includes a first stage having a first surface, a second stage having a second surface and configured to rotate with the second surface which is opposed and in proximity to the first surface, a motor including a motor body and a shaft that is an output shaft of the motor body and configured to rotate synchronously with the second stage, a fixed member arranged to rotatably support the shaft and the motor body, and a strain gauge unit fixed to the fixed member and configured to be biased by a contact of the motor body when the motor body rotates in a first direction with respect to the fixed member.

A process for evaluating rheological characteristics of an injectable gel including measuring the flexibility, wherein the flexibility is evaluated by measuring the strain at the crossover point of the amplitude sweep. The process may include subjecting an injectable gel to oscillating mechanical stresses to determine G′ and G″ as a function of strain (γ) in an amplitude sweep, determining the crossover point as the point at which G′ and G″ have the same value, determining the strain γ.sub.cross at the crossover point, and determining the flexibility of the injectable gel as γ.sub.cross or proportional to γ.sub.cross. Further, a method of comparison of dermal fillers by measuring their flexibility and a method of evaluation of dermal filler behavior in human skin by measuring the flexibility.

A method for determining the sticky point of powder samples includes introducing a sample into a first measuring part, placing a second measuring part above the first measuring part to delimit a sample chamber, using a motor to drive the measuring parts relative to one another, using a force application unit to exert a force on the sample normal to a rotational plane of the measuring parts, using a measuring unit to record a torque or shear stress of the sample between the measuring parts, using a temperature-control unit or oven to apply a temperature profile to the sample while measuring the torque or shear stress, and supplying recorded measured values of the torque or shear stress and the sample temperature at measuring points to an evaluation unit. The evaluation unit determines the sticky point from the measured values of the torque or shear stress and the temperature.

A viscosity measuring method and apparatus including (1) a step in which a plunger having an outer radius R.sub.i is immersed into a sample in a container having an inner radius R.sub.0, by an initial depth L.sub.0; (2) a step in which the plunger is further immersed at a velocity v.sub.p1 by a distance ΔL.sub.1, and a force applied to the plunger is measured; (3) a step in which a peak value F.sub.T1 of the force is obtained; (4) a step in which the plunger is returned to the initial depth L.sub.0; (5) a step in which the plunger is further immersed at a velocity v.sub.p2 by a distance ΔL.sub.2, and a force applied to the plunger is measured; (6) a step in which a peak value F.sub.T2 of the force is obtained; (7) a step in which a flow behavior index n is obtained.

Disclosed is an ethylene polymer having a viscosity-average molecular weight (Mv) of 3,000,000 or more and 15,000,000 or less.

In-line viscosity measurement systems and related methods may be useful in measuring the viscosity of a fluid in a flow path and, more specifically, in-line measuring the viscosity of a drilling fluid when integrated with drilling systems. For example, a method may include drilling a wellbore penetrating a subterranean formation while circulating a drilling fluid through the wellbore; measuring the viscosity of the drilling fluid with an in-line viscometer system after the drilling fluid has circulated through the wellbore, the in-line viscometer systems comprising either: (1) a two coaxial cylinder configuration, (2) a parallel plates configuration, or (3) a combination thereof positioned to allow for the drilling fluid to flow between the coaxial cylinders or parallel plates.

A rheometer apparatus and methods of use are provided. In one embodiment, the rheometer includes a sleeve having an interior space; a cylindrical bob disposed within the interior space of the sleeve and coupled to a first end of a bob shaft; a cross-spring pivot coupled to a second end of the bob shaft; an arm coupled to and projecting radially from the cylindrical bob; and a linear actuator coupled to the arm. In some embodiments, the rheometer apparatus may facilitate more accurate gel shear strength measurements and/or may be correlated with existing rheometer measurements.