parabola equation meaning in English

抛物线方程

There are some creations in this paper . first , the relationship among the physical property , crystal structure , preparation method and doping content is established to be a parabola equation . the extreme value of this equation determines the optimum doping content
本论文工作的创新点在于：从半导体发光材料的晶体结构出发，建立起材料的物理性能、晶体结构中原子配位数、最佳掺杂含量和制备方法之间的关系，归纳出材料掺杂的最佳掺杂含量的理论表达式。
The stress - strain curve of new - old concrete and hprrc , are suggested to be modeled by two sections : the ascending section of the stress - strain curve is simulated by cubic parabola equation and the descending section is simulated by rational fraction , where the theoretical value is in good agreement with the test value . the research results also provide a theoretical basis of earlier stage for improving crack resistance of new - old concrete interface
新一老硅及hprrc应力一应变全曲线建议采用两段式拟合:上升段采用三次抛物线方程模拟，下降段采用有理分式模拟，理论值与试验结果吻合较好。该研究成果为新老混凝土结合面抗裂能力的提高提供了前期的理论基础。