双特征的

基本解释 (translations)

bicharacteristic

与双特征的相关的网络例句 [注：此内容来源于网络，仅供参考]

Through using Mythylene DinitrAmine as rude product, the knowledge of its reaction properties in different phases have been increased, Through using Mythylene BisAcetAmide as rude product, intermediates which include 1,3-Diacetyl -4,5-dihydroxy -1,3-diazacyclopentane and 1,3-Diacetyl- 4,5-diacetoxy-l,3-diaza cyclopentane have been obtained. 2,4,6,8-tetracetyl- 2,4,6,8-tetraaza bicyclo[3,3,0]octane which can be used to produce Bicyclo-HMX by nitrolysis was also produced. Through using Mythylene BisFormAmide as rude product, intermediates which include 1,3-Diformyl-4,5-dihydroxy- 1,3-diazacyclopentane and 1,3-Diformyl- 4,5-diacetoxy-l,3-diazacyclopentane have been abtained.

以亚甲基二硝胺为初始原料，加深了对亚甲基二硝胺在不同反应相反应特征的认识；以亚甲基二乙酰胺为初始原料，制备了中间体1，3-二乙酰基-4，5-二羟基-1，3-二氮杂环戊烷和1，3-二乙酰基-4，5-二乙酰氧基-1，3-二氮杂环戊烷，最终制备了可被直接硝解为双环HMX的2，4，6，8-四乙酰基-2，4，6，8-四氮杂双环[3，3，0]辛烷；以亚甲基二甲酰胺为初始原料，制备了中间体1，3-二甲酰基-4，5-二羟基-1，3-二氮杂环戊烷和1，3-二甲酰基-4，5-二乙酰氧基-1，3-二氮杂环戊烷。

On the basis of dual feature identification method, combined with small wave analysis, it effectively extracts failure features, analyzes the stability power failure vibration signal feature on the general Fourier atlas, analyzes the shock power failure vibration signal feature on the resonance modulating Fourier atlas, using small wave to analyze the shock failure vibration signal feature.

是一种在"双特征判别法"的基础上，结合小波分析，有效提取故障特征，进行诊断的"三特征判别法"，所述的故障信号"三特征判别法"就是：在常规傅立叶谱图上分析平稳功率故障振动信号特征，在共振解调傅立叶谱图上分析冲击功率故障振动信号特征，利用小波分析冲击故障振动信号特征。

It solves the problem that the unitary contour presentation can not correctly extract face contour in a face image which suffers from scale, rotation etc. The definition of the internal and external energy function is provided. At the same time, the global matching algorithm and local matching algorithm is given. The experiment shows that this presentation and the accompanying matching algorithm can be used to extract the face contour very well. So the image segmentation can be implemented by using it.②By analyzing the recognition principle of PCA method, we can conclude that the face images coming from different surrounding consist of different face image space. This is the essential reason that makes the generality of PCA method worse. Also, we give a measurement means to measure the distance from different face image space, so we can analyze face image space more conveniently.③We also construct various scale models and rotation pose models to detect the scale and rotating angle of face image to be recognized. The experiment results show that the detecting precision is very high. So it is good for face image feature extraction and face image representation.④Similarly, we construct local feature models of face image and utilize them to detect the local feature of face image. At the same time, we put forward a novel face image local feature detection algorithm, locating step by step. The experiment results show that this method can accurately detect the location of local face feature in a image.⑤A novel face image presentation model, dual attribute graph , is put forward. Firstly, it utilizes attribute graph to present the face image, then exact the local principal component coefficient and Gabor transform coefficient of thc pixels which corresponds to the nodes of the graph as the attribute of the nodes. This representation fully makes use of the statistical characteristic of the local face feature and utilizes Gabor transform to present the topographical structure of face image. So DAG has more general property.⑥Based on the DAG presentation, we give a DAG matching function and matching algorithm. During the design of the function and algorithm, the noise factor, e. g., lighting, scale and rotation pose are considered and tried to be eliminated. So the algorithm can give more general property.⑦A general face image recognition system is implemented. The experiment show the system can get better recognition performance under the noise surrounding of lighting, scale and rotation pose.

本文在上述研究的基础上，取得了如下主要研究成果：①构造了一个通用的人脸轮廓模型表示，解决了由于人脸图象尺度、旋转等因素而使得仅用单一轮廓表示无法正确提取人脸轮廓的问题，并给出了模型内、外能函数的定义，同时给出了模型的全局与局部匹配算法，实验表明，使用这种表示形式以及匹配算法，能够较好地提取人脸图象的轮廓，可实际用于人脸图象的分割；②深入分析了PCA方法的识别机制，得出不同成象条件下的人脸图象构成不同的人脸图象空间的结论，同时指出这也是造成PCA方法通用性较差的本质原因，并给出了不同人脸空间距离的一种度量方法，使用该度量方法能够直观地对人脸图象空间进行分析；③构造了各种尺度模板、旋转姿势模板以用于探测待识人脸图象的尺度、旋转角度，实验结果表明，探测精确度很高，从而有利于人脸图象特征提取，以及图象的有效表示；④构造了人脸图象的各局部特征模板，用于人脸图象局部特征的探测；同时提出了一种新的人脸图象局部特征探测法---逐步求精定位法，实验结果表明，使用这种方法能够精确地得到人脸图象各局部特征的位置；⑤提出了一种新的人脸图象表示法---双属性图表示法；利用属性图来表示人脸图象，并提取图节点对应图象位置的局部主成分特征系数以及Gabor变换系数作为图节点的属性，这种表示方法充分利用了人脸图象的局部特征的统计特性，并且使用Gabor变换来反映人脸图象的拓扑结构，从而使得双属性图表示法具有较强的通用性；⑥在双属性图表示的基础上，给出双属性图匹配函数及匹配算法，在函数及算法设计过程中，考虑并解决了光照、尺度、旋转姿势变化等因素对人脸图象识别的影响，使得匹配算法具有较强的通用性；⑦设计并实现了一个通用的人脸图象识别系统，实验结果表明，该系统在图象光照、尺度、旋转姿势情况下，得到了较好的识别效果。

The experimental results present that the three electrodes DBD is basically display filamentary discharge mode. The intermittent filament impulses of current wave of the comb-like electrode are unsymmetrical while that of the plate-plate electrode is symmetrical. And the multineedle-plate DBD displays diffuse conical mode.

实验结果表明：三种电极放电的形式不尽相同，但基本上以细丝放电为主要特征；在放电特性上，单面梳状电极DBD呈正负半周期内电流波形上加载非对称的电流脉冲群，双介质板电极DBD则是对称的电流脉冲群，而多针—介质平板电极放电电流波形上既加载了具有电晕放电特征的稀疏幅值大电流脉冲群，又加载了具有DBD放电特征的密集小幅值的电流脉冲群，表现为DBD和电晕放电相叠加的效果。

First local surrounding-line integral bispectrum feature is extracted from the bispectrum of one dimensional range profile of space target, then BP neural network is used for target identification so that the network weights will not be the local lowest value.

提出了基于局部围线积分双谱的空间目标识别算法，从空间目标距离像的双谱中提取出局部围线积分双谱特征。

Numerical results demonstrated that there are three kinds of the instability for the under-expanded supersonic jets according to their shock cell structure patterns:(1) the regular reflection shock cell with a single shear layer,(2) the Mach reflection shock cell with two shear layers and (3) the curved Mach stem with a relatively high expansion ratio.

计算结果表明欠膨胀超声速射流的失稳机制根据射流激波结构的特征可分为3种失稳模式：具有规则反射激波结构和单一剪切层特征的射流不稳定性；带有马赫反射激波结构和双剪切层特征的射流不稳定性；具有弯曲马赫杆和高度欠膨胀射流的不稳定性。

The main jobs of this paper are as followed: 1 The reuse of the frame design technology for aircraft assembly fixtures is researched. a frame line part library is built with the templet driven technology, the reuse of the frame line part come true by the tools for instantiation and instance modification. The design resources are effectively used, some repeating work is cut. 2 Two methods to obtain the assembly feature are proposed: the straight way by the Enumeration method and the indirect way by project features to the assembly plane. All of the assembly features of the frame and the adjustable bearings are obtained by these two methods which makes the frame automatic assembly technology for aircraft assembly fixtures come true. 3 The frame automatic assembly technology aircraft assembly fixtures based on assembly features is researched. A binary tree assembly model is used to express the assembly information of the frame for aircraft assembly fixtures, the automatic assembly between the frame, the aircraft and the adjustable bearing is completed within the three steps: distribute, obtain and evaluate assembly feature. Finally, the efficiency of the frame assembly design is proved. 4The frame interpart modeling technology for aircraft assembly fixtures is researched, the intersection methods are concluded and the arithmetic of the single-cut, double-cut and inter-cut intersection is proposed, the interpart fast modeling of the frame design for aircraft assembly fixture come true. 5Based on the researches mentioned before, a sub-system of frame fast design for aircraft assembly fixture is developed on CATIA. The sub-system is used to design the aircraft assembly fixtures in a large aeronautics corporation and make a good- effect.

论文的主要工作如下： 1研究了飞机装配型架骨架设计重用技术，在总结归纳骨架线框结构类型的基础上，应用模板驱动的方法建立了骨架线框库，通过骨架线框零件的实例化和离线编辑实现骨架线框的重用，有效利用设计资源，减少重复劳动； 2提出穷举几何对象的装配特征直接获取方法，遍历零件模型的几何对象，从中捕捉所需装配特征，该方法简捷、高效；提出向装配面投影的装配特征间接获取方法，该方法在现有特征基础上生成装配特征，解决了部分装配特征难以直接获取的问题； 3研究了基于装配特征的飞机装配型架骨架自动装配技术，采用一种二叉树装配模型表达骨架的装配关系，并通过装配特征的分配、获取和赋值三个步骤，实现了骨架分别与飞机产品和可调支承的自动装配，避免了繁琐的人工交互操作，提高了骨架设计的效率和规范化程度； 4研究了飞机装配型架骨架零件间建模技术，在总结归纳骨架元件相贯处理方式的基础上，提出了骨架元件单剪切相贯、双剪切相贯和互剪切相贯的实现算法，简化了骨架相贯处理的过程； 5基于以上研究，在CATIA平台上开发了飞机装配型架骨架快速设计子系统，并应用于某大型航空企业的装配型架设计，提高了设计效率和设计质量。

First, a non-negative tensor factorization algorithm is improved by imposing sparseness constraints on it. Secondly, the bispectral images of mechanical signals are obtained and stacked to form a third-order tensor. Thirdly, the improved algorithm is used to extract features, which are represented by a series of basis images from this tensor. Finally, coefficients indicating these basis images' weights in constituting original bispectral images are calculated for fault classification.

首先，改进已有的非负张量分解算法，加入稀疏度控制策略；其次，将机械振动信号的双谱图像堆叠为一个三阶张量；然后利用改进后的分解算法对该张量进行二次故障特征提取，得到代表局部特征的"基图像"；最后，通过计算得出基图像在构成原双谱图像中所占的权重，并将得到的权重向量用于故障分类。

The trophoblast blood flow spectrum could be easily detected with the guide of CDE.The ultrasonic findings were characterized by broad arterial flow spectrum,high diastolic component of the low resistance trophoblastic flow,RI＝0.40～0.51 with single or biphasic spectrum.The salpingian ring with high blood flow indicated early and complete salpingian pregnancy.

结果：①异位妊娠包块血流信号丰富，血管连续性好，能较完整显示血管床、血管网及范围广的低流速血流信号；②脉冲多普勒取样为滋养层周围性血流频谱，其特征为：频谱增宽、单相或双相持续存在、阻力降低(RI＝0.44±0.04)、舒张期血流丰富的动脉频谱；③具有鲜明丰富的滋养层周围性彩色血流频谱特征的&输卵管环&是早期输卵管妊娠的特征性表现，并提示是输卵管完整存在的标志。

In the fifth chapter,we study dipolarizations in some quadratic Lie algebras.Inthe first section,we obtain some results on the classification of dipolarizations in gen-eral quadratic Lie algebras,and prove that there exist dipolarizations in the solvablequadratic Lie algebras whose Cartan subalgebras consist of semisimple elements.

第五章讨论了某些二次李代数的双极化，在第一节中，我们给出了二次李代数的双极化的一些分类结果；特别证明Cartan子代数是由半单元组成的二次李代数上存在双极化，第二节确定了四维扩张Heisenberg代数的所有双极化，在第三节中，我们构造了2n+2维扩张Heisenberg代数的六类双极化，我们发现两个不同于半单李代数情形的有趣事实：（1）在扩张Heisenberg代数上同时存在对称和非对称双极化；（2）对应于扩张Heisenberg代数的双极化的特征元有的是半单的有的是幂零的。

与双特征的相关的网络解释 [注：此内容来源于网络，仅供参考]

a pair of oxen：双匹牛

4. noun (动物的)偶;(动物的)一对 | a pair of oxen : 双匹牛 | 5. noun (有共同特征的)一对人

bicharacteristic：双特征性的

双阴极管 bicathode tube | 双特征性的 bicharacteristic | 重铬酸盐 bichromate

bivalve：双壳类

同时, 地层中所产中-晚二叠世腮足类(maxilliped)、晚三叠世双壳类(bivalve)化石均具特提斯型化石特征. 可见, 飞弹南缘蛇绿混杂岩带作为西南日本古特提斯消亡后的缝合带, 完全可以与琼南缝合带相对比.

Diptera：双翅目

如双翅目(Diptera)实蝇科(Tephridae)的寡毛实蝇属Dacus幼虫和蛹,利用通常的形态分类技术进行鉴定,难度很大. 尽管近年来. 某些新技术促进了昆虫分类学的发展,如利用透射电镜和扫描电镜研究超微形态特征,

etiolation：黄化

[植物学]黄化(etiolation) 多数植物在黑暗中生长时呈现黄色和其他变态特征的现象. 植物在暗中不能合成叶绿素,显现出类胡萝卜素的黄色;节间伸长很快;叶片不能充分展开和生长;根系、维管束和机械组织不发达. 双子叶植物的黄化幼苗胚轴顶端弯曲成钩状,

ft：特征频率

利用发射极金属掩蔽进行内切腐蚀的方法研制成自对准InGaP/GaAs异质结双极晶体管 (HBT),其特征频率(ft)达到54GHz,最高振荡频率(fmax)达到71GHz,并且,这种方法工艺简单,成品率高.文中还对该结果进行了分析,提出了进一步提高频率特性的方法.

Diapsida：双弓类

虽然目前尚不清楚它的系统发育位置,但可以肯定,它属于双弓类(Diapsida)爬行动物,具有一些与陆相淡水爬行动物离龙类(Choristoderes)和海相幻龙类共有的特征,如平凹型体椎,3个荐椎,背肋肿大,四肢骨的下节(尺骨、挠骨和胫骨、腓骨)远远短于上节(肱骨和股骨),

Diphyes chamissonis：双生水母

秋季次之(2.23ind./m^3),冬季(1.82ind./m^3),夏季最低(0.88ind./m^3);其平面分布特征为近海高于外海;其数量变化首先来自优势种大西洋五角水母(Muggiaea atlantica)和双生水母(Diphyes chamissonis)的贡献,前者是近岸暖温种,

trenches：有腰带的风衣,通常为双排钮

--- longs 长风衣 | --- trenches 有腰带的风衣,通常为双排钮 | --- trois-quart "四分之三",长度不限,风格多样而随意,看不出有何特征

repeated zeroes of a characteristic function：特征函数的重零点

repeated twinning ==> 反复双晶 | repeated zeroes of a characteristic function ==> 特征函数的重零点 | repeated-flow turbine ==> 回流式汽轮机