Abstract: The present invention provides a trabecular porous tantalum dental implant and a preparation method thereof. The trabecular porous tantalum dental implant provided by the present invention has a cylindrical structure, and sequentially includes a top functional area, a middle functional area and a bottom functional area from top to bottom. The top functional area has a compact structure. The middle functional area has a porous bionic trabecular structure. The bottom functional area has a compact structure. The trabecular porous tantalum dental implant is integrally prepared through an additive manufacturing technology by using pure tantalum or medical tantalum alloy powder as a raw material. The trabecular porous tantalum dental implant provided by the present invention has a high friction force, strength and modulus close to those of human bones, an excellent bone ingrowth effect, high implantation stability and long service life.

Abstract: The optimal construction quantity and site selection scheme of EV charging stations includes A parking points generated through simulation that acquires parking coordinates within city sub-regions based on relevant EV parameters and quantity q of charging stations to be constructed in the city. The target charging station is chosen and the selection model compiles constraint conditions for traveling balance and reserves site selection plans. Among site selection plans that satisfy constraint conditions, the user choses the construction quantity of charging stations with the lowest construction cost and determines the optimal site selection plan. The method to plan the optimal construction quantity and site selection scheme of EV charging stations as disclosed can effectively determine the optimal construction quantity and site selection plan for EV charging stations within a city.