Abstract: The present disclosure provides a dynamic true triaxial electromagnetic Hopkinson bar system, including a central cubic box, a horizontal cruciform support platform, and a central support platform, wherein the central cubic box is disposed in the center of the upper surface of the central support platform; the central cubic box and the horizontal cruciform support platform form an orthogonal coordinate system for precisely positioning and centering the dynamic true triaxial electromagnetic Hopkinson bar system; the confining-pressure loading systems, electromagnetic pulse generators, circular bulges, square bars, and self-lubricating square bar fixation and support frames in the directions X, Y, and Z are respectively symmetrically arranged by taking the central cubic box as a symmetric center; and the systems in the directions X, Y, and Z together construct the dynamic true triaxial electromagnetic Hopkinson bar system.

Abstract: A shear testing system and method of thermo-seepage-mechanical field and engineering disturbance coupling under deep and complex condition are provided. The shear testing system can be used in conjunction with an axial pressure application device to simplify the structure, save costs, and facilitate a triaxial confining pressure—temperature—axial pressure—torsional shear coupled test on a rock specimen. The shear testing system can achieve the following three purposes. First, the shear testing system can convert an axial pressure into a torsional shear force through a transmission mechanism of a power conversion assembly. Second, the shear testing system can apply an axial pressure to the rock specimen fixed between two specimen fixing heads, through a pressure shaft of an axial pressure mechanism. Third, the shear testing system can apply a triaxial confining pressure and a temperature field to the rock specimen.

Abstract: The present disclosure provides a thermal-stress-pore pressure coupled electromagnetic loading triaxial Hopkinson bar system and test method, the system mainly consists of an electromagnetic pulse generation system, a servo-controlled axial pressure loading system, a servo-controlled confining pressure loading system, a thermal control system, a pore pressure loading system, a bar system, and a data monitoring and acquisition system. Based on the conventional Hopkinson bar, the present disclosure creatively introduces a real-time loading and control system for confining pressure, thermal, and pore pressure, aiming to solve the technical problem that the existing test apparatus cannot be used to study dynamic response of deep rock mass under the coupling effect of thermal-stress-pore pressure and dynamic disturbance during dynamic impact loading.

Abstract: A uniaxial bidirectional synchronous control electromagnetic loaded dynamic shear test system and method, a test apparatus thereof including a support platform, a loading bar system, an electromagnetic pulse generation system, a servo-controlled normal pressure loading system, and a data monitoring and acquisition system. The test apparatus can be used to conduct a dynamic shear test research on a rock-like material under a constant normal pressure close to an actual operating condition, and can also be applied to carry out dynamic shear tests on intact rock-like test specimens in various sizes or jointed rock-like test specimens containing a single structural surface to study dynamic shear mechanical property and shear failure behavior under strain rate of 101?103 s?1, thereby providing an important theoretical and technical support for the design, construction, protection, and safety and stability evaluation of geotechnical engineering, structural engineering.

Abstract: A two-volume cryoablation cell apparatus and an ablation method thereof for LA-ICP-MS analysis of a fluid inclusion are provided. The two-volume cryoablation cell apparatus includes an ablation cell base having a square metal substrate and a metal abutment disposed on the metal substrate and shaped as a hollow cylinder; a cryogenic component including a cryogenic stage disposed on an axis of the metal abutment and configured to hold a sample; a small-volume ablation cell positioned above the cryogenic stage and in contact with an upper surface of the sample during use, wherein the small-volume ablation cell is of a hollow cylindrical shape with a transparent closed upper portion and an open lower portion; and an ablation cell cover body capable of being buckled on an upper opening of the metal abutment during use and configured to seal the sample within the metal abutment.

Abstract: A two-volume cryoablation cell apparatus and an ablation method thereof for LA-ICP-MS analysis of a fluid inclusion are provided. The two-volume cryoablation cell apparatus includes an ablation cell base having a square metal substrate and a metal abutment disposed on the metal substrate and shaped as a hollow cylinder; a cryogenic component including a cryogenic stage disposed on an axis of the metal abutment and configured to hold a sample; a small-volume ablation cell positioned above the cryogenic stage and in contact with an upper surface of the sample during use, wherein the small-volume ablation cell is of a hollow cylindrical shape with a transparent closed upper portion and an open lower portion; and an ablation cell cover body capable of being buckled on an upper opening of the metal abutment during use and configured to seal the sample within the metal abutment.

Abstract: An HVLP spray gun includes a coaxial combination air valve assembly 30 for controlling total air flow as well as pattern air flow which is frictionally retained in the gun body 12.