二次的

Applyingthe sufficient and necessary condition of biquadratic Bézier patch being non-negative,a method is presented to see whether two points are the closest points between twobiquadratic NURBS surfaces when the two points are respectively on the two surfaces. Based on the method, the surface split algorithm is improved while the surfaces arebiquadratic NURBS surfaces.

本文利用双二次 Bézier 曲面为非负的充要条件，提出了分别位于两张双二次 NURBS 曲面上的点是否为这两张曲面间距离最近的点的判别方法，并由此在双二次 NURBS 曲面的场合对计算最短距离的曲面分割法作了改进。

Fluxgate sensors have the second harmonic voltage amplitude with the magnetic field strength is proportional to the adoption of second harmonic filter through phase-sensitive detector rectifier, to achieve full-wave rectifier, low-pass filter in through the phase-sensitive detector after the second harmonic into a smooth DC signal, on the one hand to the back of the circuit, on the one hand, the magnetic flux through the door to feedback regulation, the opposite magnetic field generated with the measured magnetic field, so that the work has always been zero fluxgate magnetic field, thus ensuring the most high-precision fluxgate.

磁通门传感器产生的二次谐波电压幅值与磁场强度成正比，二次谐波通过通过滤波器再通过相敏检波器整流，实现全波整流，在通过低通滤波器将相敏检波后的二次谐波转化成平滑的直流信号，一方面送到后面的电路进行，一方面通过反馈调节送到磁通门中，产生与被测磁场相反的磁场，使磁通门始终工作零磁场下，从而保证磁通门的最高精度。关键词：磁通门磁力仪，相敏检波器，磁场

All quadrilateral mesh automatic generation for regular quadric surfaces based on Auto CAD AME;2. Represent Quadric Surfaces Using NURBS and Calculate the Control Vertecs and Weights;3. Through study,the property is found out that planes cutting edgewise quadric curve and quadric intersections from the quadric surfaces become the harmonic division.

文中采用了射影几何的方法，证明了画法几何中关于两个二次曲面相交的著名的复切定理和蒙日定理，通过研究得出了周切线平面和交线平面成调和分割的性质，同时还得出了处于复切的二次曲面必存在相公切的二次曲面的性

The second-order linear homogeneous differential equations in differential equation theory occupies an important position, but the second order differential equation has no general solution method, most of the solutions of these equations is difficult to obtain analytical expressions and even some impossible to obtain the solution of the form, and the second order differential equation solving is divided into homogeneous and inhomogeneous problems.

二阶线性齐次微分方程在微分方程理论中占有重要位置，但二阶变系数微分方程却没有一般的求解方法，大多数这类方程很难求得解的分析表达式甚至有的根本不可能求得其解的分析形式，并且二阶变系数微分方程的求解又分为齐次的和非齐次的问题。

Yongkang Hefa Tools Co.,Ltd.is a manufacturcr specializing in producing Auxiliary Air valves and carbon canisters of motorcycle,leisure vehicle,universal gasoline engine and automobile with Japanese technologies.it has obtained ISO9001:2000 certification and has several patents such as unspillable reed valve,combined gulp cylinder head ,ctc.or company is located in Baiyun Industry Area,Yongkang,a city of hardware in China with comfortable environment and convenient transportation With the first-class production ﹠ test equipment and abundant test methods,we have already gained the ability to establish a complete process line from rough machining to entire assembly.

永康市合发工具有限公司是一家专业生产摩托车、休闲运动车、通用汽油机、汽车用二次空气阀总成、碳罐的企业。公司引进了日本技术，。。。参考价格/报价： 0元/只永康市合发工具有限公司是一家专业生产摩托车、休闲运动车、通用汽油机、汽车用二次空气阀总成、碳罐的企业。公司引进了日本技术，通过 ISO ：9001：2000国际质量管理体系认证，并且拥有多项专利技术，如：无泄漏簧片阀，连体补气缸头等，具备年产二次空气阀200万套的能力。

The advantages of the simple twice zymotechnics lie in the characters of the cultivation materials, the growth of mycelia, the control of plant diseases and insect pests, the output of Volvariella Volvacea and the production cost. All these indicate that simple twice zymotechnics is a relatively reasonable compost treatment in Volvariella Volvacea cultivation.

简易二次发酵法的栽培材料理化性状、草菇菌丝生长、病虫害控制和草菇的产量、生产成本等，都比自然堆沤发酵法和常规二次发酵法有较大的优势，表明简易二次发酵法是草菇栽培中较理想的一种培养基处理方法。

The paper analyse some protection exception report of the abnormalities of voltage secondary circuit, and points out the influence of two-point earth fault in secondary circuit and current electromagnetic induction of earth fault in power system.

本文通过分析多起由于TV二次回路异常造成的保护事故，指出目前针对TV二次回路两点接地和系统接地故障电流电磁感应对电压二次回路的影响，制定的各项反措在实际实施过程中，不能完全杜绝类似事故的发生。

Compared with common quadratic elements, this kind of interpolation method achieves the same accuracy by adding a rotation degree of freedom on every vertex without using midpoints of edges or interior points. Whether consider from the running time or the space that data occupied, this sort of element is more effective than 8-nodes quadrilateral.

和一般的二次单元相比较，这种插值方法不需要使用单元边中点或者内部节点进行插值，仅在每个顶点上增加一个转角自由度就可以得到和二次元相当的精度；无论从运算时间还是数据所占用的空间来考虑，这类单元的计算花费均大大低于八节点四边形二次单元。

When the swirl variable device is part-opened, because swirl has some effect on the second injection, second injection timing has distinctly effect on fuel consumption, and the fuel consumption change fluctuantly with twice injection timing. When the tumble variable device is adopted, second injection timing also has effect on fuel consumption, but there is only one point that the fuel consumption is lowest. When the load is bigger, the second injection point where the fuel consumption is lowest is earlier than the smaller load.

在可变涡流结构中，当阀片处于非全开状态时，由于涡流运动对二次喷油的作用，二次喷油正时对发动机的比油耗存在明显影响，发动机比油耗随喷油正时改变呈较明显的波动状；在可变滚流结构中，二次喷油正时对发动机比油耗同样存在影响，但最低油耗点只有一个，当负荷较大时，最低比油耗所对应的喷油正时要更早一些。

Pathological changes in biological tissues usually cause changes in their microstructure. Since the second harmonic generation signal is highly sensitive to the sym...

介绍二次谐波成像的发展现状，生物组织中二次谐波信号的产生机理，二次谐波成像的实现手段及其在生物医学领域的应用。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。