A method for testing the internal structure of a refractory part, has the following steps: a) by a transmission antenna, sending at least one electromagnetic wave, termed a pulse, into the refractory part to be tested; b) by a reception antenna, receiving the pulse after reflection thereof by a reflecting zone of the refractory part; c) analyzing the time offset between the two preceding steps in order to deduce the position, in the refractory part, of the reflecting zone, the pulse having a duration less than or equal to 0.5 nanoseconds.

A ceramic body for dental prosthesis can suppress a variation in quality in the sole ceramic body for dental prosthesis due to expansion of its diameter. The ceramic body for dental prosthesis is made of a ceramic material, is shaped to have a circular planar shape and a disk-like external shape, and has a diameter of 50 mm or more. The method for manufacturing this ceramic body for dental prosthesis includes: preparing a ceramic material; shaping the ceramic material by press shaping or by a machine tool; temporarily sintering the ceramic material at a temperature from a sintering temperature that provides theoretical density 700 C. or more to the sintering temperature 100 C. or less; and shaping the ceramic material to have a circular planar shape and a disk-like external shape so as to prepare the ceramic body for dental prosthesis having a diameter of 50 mm or more.

Some aspects of what is described here relate to analyzing a well cement slurry. In some aspects, a well cement slurry is mixed in a mixer under a plurality of conditions. The plurality of conditions correspond to a plurality of distinct Reynolds number values for the well cement slurry in the mixer. Power number values associated with mixing the well cement slurry in the mixer under the plurality of conditions are identified. Each power number value is based on an amount of energy used to mix the well cement slurry under a respective one of the plurality of conditions. Values for parameters of a functional relationship between power number and Reynolds number are identified based on the power number values and the Reynolds number values for the plurality of conditions.

The present invention relates to a system and a method for measuring the thickness of refractories comprising a heat flux measuring device (10) for measuring the flow of heat flowing from a hot face to a cold face of the refractory, a core (11) surrounded by a thermally insulating jacket (12) comprising, in which the core (11) conducts, between a first (11a) and a second (11b) face, heat from the hot face of the refractory to the cold face of the refractory; and a measuring apparatus (20) configured to: continuously measure the temperature on the first face of the core and on the second face of the core; determining the heat flux flowing through the heat flow measuring device (10) and determining the thickness of the refractory material by means of equivalent thermal conductivity of the refractory material.

The disclosure describes techniques for detecting a crack or defect in a material. The technique may include applying an electrical signal to a first electrode pair electrically coupled to the material. The technique also may include, while applying the electrical signal to the first electrode pair, determining a measured voltage between a second, different electrode pair. At least one electrode of the second, different electrode pair is electrically coupled to the material. The technique may further include determining a corrected measured voltage by suppressing a thermally induced voltage from the measured voltage and determining whether the material includes a crack or other defect based on the corrected measured voltage.

Disclosed herein are green bodies comprising at least one ceramic-forming powder; at least one binder; and at least one cross-linked starch present in an amount of at least about 20% by weight as a super addition. Further disclosed herein is a method of making a porous ceramic body comprising mixing at least one ceramic-forming powder, at least one solvent such as water, at least one binder, and at least one cross-linked starch present in an amount of about 20% by weight as a super addition to form a batch composition; extruding the batch composition to form a green body; drying the green body; and firing the green body to form a porous ceramic body. Also disclosed herein are methods of screening a green body for making a porous ceramic body.

A non-destructive testing method for flexural strength of fine ceramic, an apparatus, and a storage medium, including adjusting an uncut intact fine ceramic test sample to an ultrasonic testing position, and fixing the test sample; adjusting an ultrasonic testing instrument, controlling and adjusting the positions of ultrasonic testing probes of the ultrasonic testing instrument until the ultrasonic testing probes, the fine ceramic test sample and the resiling direction are located on the same plane, performing ultrasonic testing on the test sample, and collecting ultrasonic testing data of the test sample; adjusting the position of the fine ceramic test sample until a resilience testing rod and the test sample are located on the same plane and fixed, performing resilience testing on the test sample, and collecting resilience testing data of the test sample; and building a data model, or substituting testing data into the pre-built data model.

Some aspects of what is described here relate to analyzing a well cement slurry. In some aspects, a well cement slurry is mixed in a mixer under a plurality of conditions. The plurality of conditions correspond to a plurality of distinct Reynolds number values for the well cement slurry in the mixer. Power number values associated with mixing the well cement slurry in the mixer under the plurality of conditions are identified. Each power number value is based on an amount of energy used to mix the well cement slurry under a respective one of the plurality of conditions. Values for parameters of a functional relationship between power number and Reynolds number are identified based on the power number values and the Reynolds number values for the plurality of conditions.

Methods and systems of analyzing and quantifying a surface acidity on a low surface area sample are disclosed. The methods include analyzing a quantity of an effluent molecular probe desorption from a temperature programmed desorption (TPD) process and system, by employing a mass spectroscopy (MS) system. The molecular probe is chemically adsorbed on a clean surface of the sample before the TPD process. The sample has a surface area to mass ratio of less than 5 m.sup.2/g. In some embodiments, the total surface area analyzed in the method can be as low as 3 m.sup.2.

The present disclosure relates to a material testing system for use in testing material strength of various gas turbine engine components. The material testing system provides a load force onto portions of gas turbine engine components.