1) discriminant of quadratic form
二次型的判别式
2) Secondary
二次
1.
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
3) two-step ejecting
二次推出
1.
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。
4) reheating
二次加热
1.
Reheating Process for the Semi-solid A356 Alloy;
半固态A356合金的二次加热工艺研究
2.
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
3.
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。
5) secondary crack
二次裂纹
6) secondary dedusting
二次除尘
1.
The contact pattern of boiler auxiliary machinery was modified with the adoption of layer-by-layer coal charging technology,realizing secondary dedusting,improving the heat efficiency and reliability of boiler.
采用分层给煤技术,改造锅炉辅机连接方式,实现二次除尘,提高锅炉热效率和可靠性。
2.
Appropriate choice of top draft hood type is a key point for the modification project of secondary dedusting of converter off-gas at Xingtai Steelmaking Plant.
正确选定顶吸罩类型是邢钢转炉二次除尘改造治理的关键。
7) second cooling
二次冷却
1.
The article discusses about the solidification thickness calculated with mathematical models on the basis of thermal balance equations at second cooling area as well as the realization of computer programs.
根据热平衡方程,讨论了二次冷却区的凝壳厚度计算模型和计算机程序实现。
8) secondary hydrocarbon generation
二次生烃
1.
Control role of primary hydrocarbon temperature-increasing velocity of organic matter to the secondary hydrocarbon generation;
有机质初次生烃升温速率对二次生烃的控制作用
2.
Discussion on hydrocarbon generation potential and secondary hydrocarbon generation of organic matter from Permo-Carboniferous coal measures in the southern North China;
南华北地区石炭-二叠纪煤系生烃潜力与二次生烃探讨
3.
Researches on secondary hydrocarbon generation in Southwest of Jianghan Basin and its effects on hydrocarbon accumulations;
江汉盆地西南缘二次生烃及其对油气成藏的影响
9) quadratic curves
二次曲线
1.
The Circle Interpolator based on the algebra figuring, if we change only a few preset constants in the register, we can directly Interpolate a quadratic curves.
基于代数演算法的圆弧插补器,只要改变相应的几个寄存器的予置常数,就可直接插补非圆二次曲线。
2.
Furthermore,it can represent the elliptic curves,parabola and other quadratic curves without using rational form.
给出了一种基于三角函数的类三次参数曲线,该曲线不仅具有类似于三次Bézier曲线的诸多性质,而且无需有理形式即可精确地表示椭圆、抛物线等二次曲线。
3.
In this paper, we discuss question to find solution for a function different equation,several quadratic curves geometry properties are obtained.
本文通过对一个泛函微分方程解的讨论,给出一类二次曲线的几何性质。
10) secondary sand
二次加砂
1.
Some technologies were used at well Niu103 and Niu106, such as low temperature water - base fracturing fluid, prepad liquid nitrogen and mixed affusing liquid nitrogen with fracturing fluid to cleanup, secondary sand fractu.
针对三塘湖盆地牛圈湖特低渗透油藏地质特征,建立试验区,实施提前注水提高地层压力,油井压裂投产的开发技术对策,在牛103、牛106井采用低温水基压裂液、前置液氮和拌注液氮助排、二次加砂压裂等工艺,通过压裂获得显著的增产效果。
补充资料：二次型
| 二次型 quadratic form 线性代数的主要内容之一。起源于解析几何中二次曲线、二次曲面标准方程的研究。设aij取自数域F且aij＝a ji(i，j＝1，2，…，n)，则F上x1，…，xn的二次齐式f(x1，…，xn)＝  ，称为F上n元二次型，简记为 f，它有矩阵表示f（x1…xn）＝（x1…xn）A(x1…xn )′。A＝（aij）n＝A′由f唯一确定，称为f的矩阵；A的秩称为f的秩。一个只含平方项的二次型称为标准二次型。设P是F上的可逆矩阵，f经变量的可逆代换（x1…xn）＝（y1…yn）P′得到的二次型是g(y1…yn），则称g与f等价。每个二次型等价于一个标准二次型。秩为r的复二次型等价于 ＋…＋ ，从而互不等价的n元复二次型共有n＋1类。每个秩r的实二次型有唯一的标准形 ＋…＋ －…－ ，从而互不等价的n元实二次型共有（n＋1）（n＋2）类。与y1＋…＋yn等价的实二次型称为正定二次型，十分有用。二次型理论在几何、物理等学科有广泛应用。通过坐标的正交变换所得标准形称为主轴形式，它是解析几何问题的自然推广。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条