Abstract: A high-sensitivity two-dimensional electron gas channel structure magnetic sensing matrix chip includes a magnetic sensing matrix, a shift register, and a back-end interface circuit. The magnetic sensing matrix includes several matrix units including substrate, buffer layer, channel layer, and barrier layer. A two-dimensional electron gas channel material heterojunction structure includes buffer layer, channel layer, and barrier layer on the substrate, and the horizontal Hall element and switching device are above the channel layer. The beneficial effects include a high sensitivity magnetic sensing matrix chip with two-dimensional electronic gas channel structure can be used for real-time, static and dynamic measurement of multi-dimensional magnetic field distribution under high temperature, high pressure, high radiation and other harsh environments to carry out structural and circuit innovation and production.

Abstract: An in vitro endothelial cell culture system for optimizing the pulsatile working mode of a continuous flow artificial heart belongs to the technical field of artificial organs. The system includes three parts: 1) a cell culture model on a microfluidic chip and an off-chip multielement aortic arch afterload fluid mechanics circulation loop; 2) devices for simulating the power source of a cardiovascular system: a fluid loading device is realized by a pulse blood pump, and an artificial heart device is connected in parallel to both ends of the pulse blood pump; and 3) a peripheral detection and feedback control system, comprising pressure and flow sensors, a fluorescence microscope, a CCD high-speed camera system and a proportional-integral-derivative feedback control system. The system can accurately simulate the real hemodynamics microenvironment of vascular endothelial cells in different parts of the aortic arch.