摘要：As defined in a decree issued in the spring of 583,the three heads or sanzhang system,designed to be implemented chiefly in the old Northern Qi area in Shandong,basically followed the Northern Qi version of 564,with slight *** the setting up of a system of xiang heads(xiangzheng乡正)who would hear disputes among the common people,as recommended in Su Wei’s memorial of the same year,the judicial position of xiangzheng coexisted with the administrative positions of the three-heads(or two-heads)*** xiangli(乡里)system announced in the edict of 589 targeted the territory previously under the Chen dynasty;it was basically a continuation of the xiangli system of rural control originally based on a Han dynasty model and followed since then in the south under the Eastern Jin and the Southern *** the reform of the bureaucratic system in 607,the xiangli system centered on xiangzheng and lizhang became the basic system of rural administration under the Sui *** the course of its design and creation,the system had to take into account the institutions already existing in the target area and the question of ***“inconsistency”or“regional variation”was built into the ***,in actual practice there was a tendency toward convergence that led to uniformity of *** Chinese history,the coexistence of regional variation and uniformity was a marked feature of the formation and implementation of different systems.

摘要：In this paper, a new illumination system with ultra high performance (UHP) lamp is proposed for projection display. Parabolic reflector (PR) and compound parabolic retro-reflector (CPR) were jointly used to collect and collimate the light generated from UHP lamp. A polarization converter system (PCS) was used to increase the light efficiency of the projection display system. A beam transformer between PCS and 2f imaging systems was directly used to make the illumination meet the requirement of projection display system. With the consideration of the loss of reflection, the light efficiency in this projection display system was estimated to be 15.6%.

摘要：In clinical magnetic resonance imaging （MRI）, the design of the radiofrequency （RF） coil is very important. For certain applications, the appropriate coil can produce an improved image quality. However, it is difficult to achieve a uniform B1 field and a high signal-to-noise ratio （SNR） simultaneously. In this article, we design an interventional transmitter-and-receiver RF coil for cerebral surgery. This coil adopts a disassembly structure that can be assembled and disassembled repeatedly on the cerebral surgery gantry to reduce the amount of interference from the MRI during surgery. The simulation results and the imaging experiments demonstrate that this coil can produce a uniform RF field, a high SNR, and a large imaging range to meet the requirements of the cerebral surgery.