pencil of conic curves

The concept of base of pencil of conic curves is proposed,and the computational.

为此,提出了二次曲线束基的概念,给出了不同条件下利用二次曲线束求解二次曲线的具体计算方法。

Study on Secondary Seismic Acquisition in Southern Steep Zone in Biyang Depression;

泌阳凹陷南部陡坡带二次采集方法研究

Througn designing three axial slots in internal threaded portion and optimizing nib structure,a design was made on the injection mould with a two-step ejecting mechanism with non-rotating.

对笔尖内螺纹部分设计三段轴向开槽,优化笔尖结构,设计了二次推出不带旋转机构的自动脱螺纹注塑模。

Reheating Process for the Semi-solid A356 Alloy;

半固态A356合金的二次加热工艺研究

Detection of the Reheating State of Semisolid Hypoeutectic Al-Si Alloy;

半固态亚共晶铝硅合金二次加热状态检测

The effects of processing parameters of semi-solid billets preparation,reheating temperature and holding time on the semi-solid slurry microstructure of AlSi7MgBe alloy by liquidus semi-continuous casting were studied.

采用近液相线半连续铸造技术制备AlSi7MgBe合金半固态坯料,研究制坯工艺以及二次加热温度和保温时间对半固态浆料微观组织的影响,通过组织与性能分析对AlSi7MgBe合金的半固态触变成形性进行了研究。