搜索结果: 1-13 共查到“facet”相关记录13条 . 查询时间(0.093 秒)
An undiscovered facet of hydraulic redistribution driven by evaporation—a study from a Populus tomentosa plantation
Populus shallow root system drought stress lateral roots (LRs) Populus tomentosa EDHR
2023/12/6
Maintaining the activity and function of the shallow root system of plants is essential for withstanding drought stress, but the associated mechanism is poorly understood. By investigating sap flow in...
基于尺度空间技术的归一化Facet模型位场边界识别
边界识别 尺度空间函数 归一化Facet模型检测算子 位场
2019/2/27
边界识别是位场数据处理解释中的重要环节，传统边界识别方法通常不能均衡深、浅部地质体边界.基于尺度空间技术和归一化的Facet模型检测算子，本文开发了一种带通空间滤波和边缘检测相结合的边界识别方法，有效地提高位场数据边界识别的精度和可靠性.为了验证本文算法的有效性和稳定性，分析了不同尺度空间函数和检测算子对算法的影响，并且对比了传统边界识别方法的效果.理论模拟和实际数据分析表明，利用位场垂向二阶导数...
Continuum approach to self-similarity and scaling in morphological relaxation of a crystal with a facet
Continuum approach self-similarity and scaling morphological relaxation crystal with a facet
2015/10/16
The morphological relaxation of axisymmetric crystal surfaces with a single facet below the roughening transition temperature is studied analytically for diffusion-limited sDLd and attachment-detachme...
Facet evolution on supported nanostructures:Effect of finite height
Facet evolution nanostructures finite height
2015/10/16
The surface of a nanostructure relaxing on a substrate consists of a finite number of interacting steps and often involves the expansion of facets. Prior theoretical studies of facet evolution have fo...
针对存在复杂背景干扰和噪声情况下的红外弱小目标检测问题，提出了一种基于循环平移Contourlet变换和Facet模型多向梯度特性的检测方法。首先通过循环平移Contourlet变换，利用硬阈值对图像进行去噪，提高图像的信噪比和平滑性；然后设计了一种基于Facet模型多向梯度特性的中值滤波器，对去噪后的图像进行滤波，有效地抑制复杂背景和噪声；其次采用两级最大类间方差算法对滤波后的图像进行分割；最后...
L2 Reading Comprehension Test in the Persian Context：Language of Presentation as a Test Method Facet
L2 Reading Comprehension Test Persian Context Test Method Facet
2009/8/20
Test method facet has been considered as an important factor affecting the testee's performance
on a test. That is, a test used to assess a particular ability would yield different results when
diff...
基于Facet模型的边缘检测算法
影像测量系统 Facet模型 综合梯度算法
2009/8/11
使用CCD的影像测量系统进行精加工零件尺寸检测时，零件轮廓边缘的定位精度和处理速度是优先考虑的2个问题。该文介绍了一种基于Facet模型的综合梯度边缘检测算法，并针对其边缘定位精度低和执行效率低的问题，给出一种提高边缘定位精度的算法和加速计算Facet模型的算法。该改进算法使用动态阈值定位边缘以提高边缘定位精度，同时将Facet模型的二维卷积分解为2个一维卷积核，使算法的复杂度从 降低到 。通过对...
CT图像的分形特征和Facet边缘检测
边缘定位 边缘检测 CT图像
2009/7/24
Facet模型能够获得准确的图像边缘信息，但运用Facet模型对目标进行分割时，时间复杂度比较高。针对该问题，从CT图像目标特征的角度，将分形维数特征引入Facet模型。首先利用图像边缘分形维数较大的特点，获得大致的边缘候选点，然后对边缘候选点集运用Facet模型进行分割，得到边缘点的准确位置。实验结果表明，该方法不仅能获得准确的边缘，而且提高了处理速度。
弱小目标一般是图像局部区域的极值点。针对这个特点，依据二元三次函数的极值理论，该文提出了一种新的弱小目标候选点的检测方法。发展了一种新的图像局部灰度拟合模型，即Zernike-facet模型，模型参数的求解采用比最小二乘(LS)抗噪能力更强的总体最小二乘(TLS)算法。新检测方法通过Zernike-facet模型和TLS对原始图像中每一个像素的局部区域进行曲面拟合，然后在拟合曲面上提取极值点作为目...
Correction of post-traumatic kyphosis using intermediate facet joints as fulcrum in dorso-lumbar spine injuries
Dorso-lumbar spine Spinal injuries Spinal fracture Spinal fusion
2008/11/27
Background : Post traumatic kyphotic deformity are managed by different methods. Posterior stabilization of dorso-lumbar fractures with transpedicular screws and rods using intermediate facets as fulc...
Towards Multi-granularity Multi-facet E-book Retrieval
Towards Multi-granularity Multi-facet E-book Retrieval
2010/12/17
Generally speaking, digital libraries have multiple granularities of semantic units: book, chapter, page, paragraph and word. However,there are two limitations of current eBook retrieval systems:(1) t...
英国图书馆与信息注册协会2006年10月4日讯 在Facet出版社发行的重要新书中，来自9个国家和4大洲的25位作家发表了数字时代知识新素质。“数字化知识素质”讨论在逐渐充满数字技术的教育环境中学习者需要如何去装备。由苏格兰格拉斯哥大学信息技术学院院长艾伦•马丁和美国俄亥俄州博林格林州立大学教学、知识与技术中心创始理事长丹•马迪根（现任奖金聘用理事长）共同编辑。
Application of spatially resolved thermoreflectance for the study of facet heating in high power semiconductor lasers
thermoreflectance
2011/5/3
We have developed a new technique for monitoring the facet heating in semiconductor lasers and for correlating these measurements with the performance and reliability of the device. The method is base...