A method for generating a highly distinctive signature of a certain diamond, the method may include generating, based on one or more images of the certain diamond, a certain diamond signature of the certain diamond; finding, out of a group of reference diamonds, other diamonds having other diamond signatures; wherein the finding comprises calculating similarities between the certain diamond signature and reference diamond signatures of the reference diamonds of the group; and generating a new certain diamond signature that significantly differs from signatures of the other diamonds.

Hundreds of thousands of concrete bridges and hundreds of billions of tons of concrete require characterization with time for corrosion. Accordingly, protocols for rapid testing and improved field characterization systems that automatically triangulate electrical resistivity and half-cell corrosion potential measurements would be beneficial allowing discrete/periodic mapping of a structure to be performed as well as addressing testing for asphalt covered concrete. Further, it is the low frequency impedance of rebar in concrete that correlates to corrosion state but these are normally time consuming vulnerable to noise. Hence, it would be beneficial to provide a means of making low frequency electrical resistivity measurements rapidly. Further, prior art techniques for electrical rebar measurements require electrical connection be made to the rebar which increases measurement complexity/disruption/repair/cost even when no corrosion is identified. Beneficially a method of determining the state of a rebar without electrical contact is taught.

A spectroscopic measuring device includes a halogen lamp as a light source, a lens of an irradiating system, a mirror, and a spectrometer. The lens of the irradiating optical system emits light from the halogen lamp to a measurement object. The mirror is an optical member, and the mirror is arranged coaxial with the lens and conducts detecting light between the halogen lamp and the measurement object, to the spectrometer. The spectrometer is an analyzing part and analyzes material of the measurement object on the basis of the light received via the mirror. The light from the halogen lamp to the measurement object passes through the peripheral part of the optical axis of the lens, and the light to be received by the spectrometer passes through the center part of the optical axis of the lens, at the position of the mirror.

This invention is test equipment for determining a concrete's compressive strength class and characteristic equivalent cube compressive strength value while the concrete is in its fresh concrete period.

This invention is test equipment for determining a concrete's compressive strength class and characteristic equivalent cube compressive strength value while the concrete is in its fresh concrete period.

An optical measurement system comprising a vessel for non-invasively testing a sample material composition in-situ and in real time. The test chamber is configured to hold a sample material composition for a wellbore. The optical measurement system is configured to provide in-situ monitoring of the sample material composition in real time and at high temperature and high pressure. Dimensional and geometrical changes occurring within the sample material composition are monitored using the optical measurement system. The system further performs goniometry on a sample.

A sensor device includes a housing having a hole allowing substances to pass from an exterior of the housing to an interior of the housing, and a printed circuit board having a humidity sensor and at least one electronic component. The sensor device also includes a tube comprising a waterproof material, wherein a first end of the tube surrounds the humidity sensor, wherein a first seal is formed by between the first end of the tube and the printed circuit board, wherein a second end of the tube is located proximate the hole. The sensor device also includes a waterproof, breathable material layer disposed between the second end of the tube and the hole, wherein a second seal is formed between the material layer and the housing, wherein a third seal is formed between the material layer and the second end of the tube. The hole and the material layer allow water vapor to pass from the exterior to the humidity sensor. The first, second, and third seals prevent the water vapor from reaching the at least one electronic component.

A concrete temperature stress testing machine system including: a concrete temperature stress testing machine and a walk-in environment simulation laboratory system; and the walk-in environment simulation laboratory system includes a walk-in environment simulation laboratory, a host control cabinet, a compressor set room, an environment room control cabinet and a computer. The concrete temperature stress testing machine achieves the temperature deformation self-compensation by using the combination of different proportions of invar and No. 45 steel, an embedded type directly measuring deformation technology of the concrete temperature stress testing is achieved by the fit between the upper and side embedded parts, the embedded rod and the extending rod. The concrete temperature stress testing machine system according to embodiments of the present disclosure may compensate the impact of the temperature deformation by itself and directly measure the true deformation of concrete, thereby having high accuracy, good long-term stability, easy operation and other advantages.

Methods for using electron diffraction holography to investigate a sample, according to the present disclosure include the initial steps of emitting a plurality of electrons toward the sample, forming the plurality of electrons into a first electron beam and a second electron beam, and modifying the focal properties of at least one of the two beams such that the two beams have different focal planes. Once the two beams have different focal planes, the methods include focusing the first electron beam such that it has a focal plane at or near the sample, and focusing the second electron beam so that it is incident on the sample, and has a focal plane in the diffraction plane. An interference pattern of the first electron beam and the diffracted second electron beam is then detected in the diffraction plane, and then used to generate a diffraction holograph.

A quality evaluation method has a step of producing a silicon for evaluation in which a single crystal silicon is grown to extend radially from a core wire 9 while polycrystalline silicon is grown in a reactor 20; and a step of performing an evaluation using the single crystal silicon.