查询词典 regular algebraic surface

At the same time, the four different genesis types of the sequence interfaces are divided: orogenic erosive sequence unconformity interface, uplift erosive sequence unconformity interface, transgression onlap sequence unconformity interface, exposural sequence unconformity interface; simultaneously the ten concrete mineral showing forms are summarized, i.e. paleo-weathering crust, drossy layer, river rejuvenation surface, paleo-karst surface, slope gravity current erosion surface, intrabasin turbid flow erosion surface, volcanic events surface, lithologic and lithofacies conversion surface, onlap surface and maximium sea flooding surface.

同时归纳出了4种不同的层序界面成因类型：造山侵蚀层序不整合界面、升隆侵蚀层序不整合界面、海侵上超层序不整合界面和暴露层序不整合界面等；同时总结出10种具体的物质表现形式，即：古风化壳、渣状层、河流回春作用面、古喀斯特作用面、斜坡重力流冲刷侵蚀面、盆地内浊流侵蚀面、火山事件作用面、岩性、岩相转换面、上超面和最大海泛面。

The differences between the edge of canopy gap and interior of forest and the differences between trunk surface temperature at the edge and surface temperature in the center of gap were also analyzed. The findings showed that there were high temperature regions on the east and north of middle vertical active surface of edge. So that the vertical active surface of edge is a new thermal active surface on the vicinage of canopy gap beyond soil surface on the interior of forest, soil surface on the gap, and forest canopy surface.

指出在林窗区域，受太阳直接照射的东侧和北侧林墙中部存在表面温度高值区，是林窗区域除林冠面、林窗地面、林内地面之外的新的第4热力作用面，对探讨林窗区域的热量传输、小气候形成以及林窗边缘植物的侧向生长等均有重要意义。

For the first time, a screw pile and pile driver system for preventing flood and rushing to deal with an emergency was manufactured. The screw piles of the system is different from screw drills used to sap, and it doesn't push soils out. Analyses, including the screw pile's structural strength analysis and the screw blade's welding analysis, were done by ANSYS, which showed that the screw pile's structural strength is enough and that the distort of the screw blade is small. Testing on the screw pile and pile driver system showed that the system performed stably and could meet the need of preventing flood and rushing to deal with an emergency. A mechanics model of interaction of a screw pile and soil was built, and expressions of torque of screw pile's cylindrical part on the condition of screw pile's crew part being driven into soil fully were gained, then the relation of the torque with screw pitch and out diameter of cylinder, which shows the torque decreases with the screw pitch increasing, and that the torque increases with the out diameter of cylinder increasing, which was according with the experiments of the screw pile's being driven into soils, and thus a screw pile with the best structure was chosen. Experiments of bionic surface showed that, on the condition of certain pressure on the surface, the protruding bionic surface can not reduce adhesion and resistance and that the corrugated bionic surface can reduce adhesion and resistance. An orthogonal experiment of the corrugated bionic surface was done with the factors including the width of protrusion, the space between two protrusions, the trolley's velocity and the vertical surface pressure and with the surface frictional coefficient as the experimental target, and some inclusions were drawn that the best combination of the factors was acquired and that the width of protrusion affected the surface frictional coefficient remarkably.

研制了防汛抢险螺旋桩机系统，提高了沉桩作业效率；利用ANSYS对桩体进行整体结构强度分析以及螺旋叶片的焊接分析，表明桩体结构强度足够，焊接过程中，螺旋叶片的变形小；对整个螺旋桩机系统进行试验，表明该系统性能可靠，工作稳定，作业效率高，能够满足防汛抢险沉桩作业基本需要；建立了螺旋桩桩土作用力学模型，得出螺旋桩沉桩过程中螺旋桩螺旋部分完全进入土体时螺旋桩圆柱部分所受扭矩以及扭矩与防汛抢险螺旋桩的螺旋导程和圆柱外径的关系曲线，表明螺旋桩螺旋部分完全进入土体时螺旋桩圆柱部分所受扭矩随着螺旋导程的增大而减小，随着圆柱外径的增大而增大，这与螺旋桩沉桩试验结论相符合，据此优选出最佳结构的螺旋桩；仿生曲面试验表明，尺寸较小的球冠突起型仿生曲面在一定压力作用下未能起到减粘降阻的作用，而尺寸较大的波纹型仿生曲面相对平板具有一定的减粘降阻作用；以波纹型仿生曲面突起宽度、波纹型仿生曲面两突起之间间距、台车的牵引速度以及叶片表面垂直载荷为因素，以曲面摩擦系数试验指标进行正交试验，寻求出在一定试验条件下最佳因素水平组合；波纹型仿生曲面突起宽度在本试验条件下对曲面摩擦系数影响显著，而其它几个因素对曲面摩擦系数影响均不显著；通过波纹型仿生曲面突起宽度和台车牵引速度的单因素试验，表明曲面摩擦系数随着仿生曲面突起宽度的增大而减小，而随着台车牵引速度的变化基本保持不变，和正交试验结果保持一致。

The meaningful regions obtained by range image segmentation correspond to the surface patches of 3D object.The 3D surface patches are then reconstructed by the algebraic surface fitting method;the surface parameters are estimated by solving generalized eigenvector problem. The geometric model of 3D object is constructed from reconstructed surface patches by using CAD geometric modeling tool GEOMOD.

首先通过编码光栅方法获取三维物体的深度图象，并采用数学形态学的方法加以分割，然后利用代数曲面拟合手段对分割后的三维曲面片进行重建，并使用CAD几何建模工具由重建的曲面片构成物体的几何模型。

This paper proves that the rolling sphere surface determined by two algebraic surfaces is also an algebraic surface.

摘要证明由两代数曲面所确定的滚球曲面仍是代数曲面。

A frame to construct a blending surface among quadrics with the algebraic tensor-product B-spline surfaces was presented. A C^1 continuous algebraic spline surface was obtained that very smoothly joined the given quadrics.

给出了一种应用代数张量积B样条曲面构造blending曲面的框架并详细讨论了二次代数曲面间blending曲面的构造方法。

If the surface isrepresented by an implicit algebraic equation,the mapping can be constructed bythe theory of parametrization of algebraic surfaces;If the surface is represented byan parametric equation,the parameter values on the parameter plane can be solvedby numerical method or Grobner Basis method.

若曲面由代数隐式方程给出，可通过代数曲面参数化理论构造映射；若曲面由参数方程给出，可通过数值方法或Grobner基方法求解参数型值点。

The main content reads as follows: Chapter 1 gives a survey on the three methods by which regular geometric modeling can be rended, including parametric curves/surfaces modeling method, algebraic curves/surfaces modeling method and subdivision. Moreover we introduce in greater detail about two means for subdivision which fit into two class: geometric subdivision and algebraic subdivision.

全文主要内容如下：第一章首先对CAGD中构造&规则几何形体&的三类造型方法：参数曲线、曲面造型方法，代数曲线、曲面造型方法及细分法——曲线、曲面的离散化造型方法，作了较系统的综述，并对两类主要的细分法——几何方法与代数方法，作了较详细的介绍。

The four types of sequence interfaces embody ten types, such as paleocrust of weathering, drossy layer, river rejuvenation, palaeokarstification surface, scouring and erosional surface of slope gravity flow, erosional surface of basin turbidity current, volcanism surface, transfer surface of lithologic characters or lithofacies, onlap surface and maximum flooding surface.

以此为基础，将右江盆地泥盆系—中三叠统划分为6个二级层序和49个二级层序。

Mounting the electricity nichrome wire in the internal surface of the ceramic fiber board,having five-surface heating-up ways of fornt surface,behind surface,left surface,right surface and under surface,good temperaure uniformity and the temperature rises quickly.

保温材料采用陶瓷纤维，保温效果好，节能50%以上。？把电炉丝镶嵌在陶瓷纤维板和内表面，可选择前、后、左、右、下五面加热方式，温度的均匀性好，升温速度快。

The changes of the HAF after liver injury may be related to the volume of blood loss, the intraabdominal pressure and the pneumoperitoneum duration.

肝撞击伤伴失血后肝动脉血流量的变化与失血量、气腹压力以及气腹持续时间等有密切联系。

Reneging on our commitments to the world's poor cannot be an austerity measure, she said.

放弃我们给世界上的穷国的承诺不能成为一种紧缩措施。