Determining a physical property of a fluid by: vibrating a vibratory transducer element in a fluid at a vibration frequency, wherein the vibratory transducer element comprises a fluid-contacting elongate member characterised by a width, a half width that is equal to half of the width, and a length that is greater than the width, wherein the half width is less than a propagation depth of a shear wave in the fluid at the vibration frequency; making a measurement of the vibration of the vibratory transducer element in the fluid at the vibration frequency; and determining, based on the measurement of the vibration, a physical property of the fluid such as a viscosity, a viscoelasticity, a density, a fluid stiffness, a loss tangent, a storage modulus, a loss modulus, or a yield stress.

An apparatus and a method arranged for measuring a rheological and/or interfacial property comprising: a pressure unit arranged for providing a quantity of a gas at a predetermined pressure to a surface of the fluid; a detection unit arranged for detecting a surface deformation of the fluid, due to the pressurized gas at a plurality of locations at the surface of the fluid; a reference register comprising reference data related to surface deformations of respective fluids, and related to known rheological and/or interfacial properties of the respective fluids; a determining unit arranged for: receiving the detected surface deformation from the detection unit; accessing the reference data of the reference register; determining respective correlations between the detected surface deformation, and the surface deformations of the respective fluids from the accessed reference data; and identifying a fluid of the respective fluids of the reference data based on a maximum correlation among the determined respective correlations; and an output unit arranged for outputting the rheological and/or interfacial property respectively corresponding with the fluid identified by the determining unit. A method for measuring a rheological and/or interfacial property of a fluid.

A method for determining at least one composition parameter of a urea-synthesis process stream comprising the step of measuring the density of said stream by means of a vibration density meter in contact with said stream and determining the ammonia/carbon dioxide molar ratio N/C of said stream on the basis of the density measured by said vibration density meter.

The present invention provides a method for quantitatively evaluating a blending degree of new- and old-asphalt based on recycled asphalt mortar. A linear viscoelastic area of the recycled asphalt mortar is tested and determined based on strain scanning; a rheological index of the recycled asphalt mortar is obtained based on frequency scanning; a difference between a rheological index of recycled asphalt mortar with complete blending of new asphalt and old asphalt and a rheological index of actually blended recycled asphalt mortar is compared; and a complex modulus deviation rate and the blending degree of new- and old-asphalt that are at a key frequency are calculated based on formulas

[00001]$\mathrm{MDI}=\frac{1}{N}{.Math.}_{i-1}^N.Math.\frac{G_{\mathrm{actual}\mathrm{blending}\left(f_i\right)}^{*}-G_{\mathrm{complete}\mathrm{blending}\left(f_i\right)}^{*}}{G_{\mathrm{complete}\mathrm{blending}\left(f_i\right)}^{*}}.Math.$

and DOB=1MDI, where MDI represents the complex modulus deviation rate; DOB represents the blending degree of new- and old-asphalt; N represents a number of parallel tests

[00002]$G_{\mathrm{actual}\mathrm{blending}\left(f_i\right)}^{*}$

represents a complex modulus of the recycled asphalt mortar with actual blending of the new asphalt and the old asphalt; and

[00003]$G_{\mathrm{complete}\mathrm{blending}<p></p>\; <div\; class="offcanvas\; offcanvas-end\; w-75"\; data-bs-scroll="false"\; data-turbo-permanent="true"\; id="chat">\; <turbo-frame\; loading="lazy"\; class="vstack\; h-100"\; id="sidebar\_chat"\; src="/chats"></turbo-frame>\; </div>\; <div\; class="toast-container\; position-fixed\; top-0\; end-0\; p-3"\; data-toast-container-target="container"></div>}^{}$