我国甘蔗杀菌剂登记现状、研究进展及发展建议

我国甘蔗种植面积大,病害发生种类多,为害严重,农药防治仍然是主要措施。但目前甘蔗杀菌剂登记产品只有1个,最大残留限量标准只有1种。近年来,国内利用杀菌剂防治甘蔗病害取得重要进展。建议加快甘蔗杀菌剂登记速度,制定更多杀菌剂在甘蔗中的最大残留限量标准。     

AutoCAD二次开发在公路路产登记中的应用

AutoCAD是广大工程设计人员普遍使用的绘图软件,结合专业特点,通过AutoCAD内嵌的Visual LISP语言进行二次开发可以方便地增加CAD命令,从而提高工作效率,本文通过应用实例对AutoCAD在公路路产登记工作上的应用进行了探讨,并充分说明在工程设计工作中结合本专业要求开发一定功能的Visual LISP程序可以有效降低工作人员的劳动强度,从而使AutoCAD不仅仅是绘图工具,而真正成为设计人员得心应手的高效设计平台。     

Versatile spectral methods for point set matching

This work is concerned with the problem of point set matching over features extracted from images. A novel approach to the problem is proposed which leverages different techniques from the literature. It combines a number of similarity metrics that quantify measures of correspondence between the two sets of features and introduces a non-iterative algorithm for feature matching based on spectral methods. The flexibility of the technique allows its straightforward application in a number of diverse scenarios, thus overcoming domain-specific limitations of known techniques. The proposed approach is tested in a number of heterogeneous case studies: of synthetic nature; drawn from experimental biological data; and taken from known benchmarks in computer vision.     

A survey on image mosaicing techniques

Image mosaicing, the process of obtaining a wider field-of-view of a scene from a sequence of partial views, has been an attractive research area because of its wide range of applications, including motion detection, resolution enhancement, monitoring global land usage, and medical imaging. A number of image mosaicing algorithms have been proposed over the last two decades. This paper provides an in-depth survey of the existing image mosaicing algorithms by classifying them into several groups. For each group, the fundamental concepts are first explained and then the modifications made to the basic concepts by different researchers are explained. Furthermore, this paper also discusses the advantages and disadvantages of all the mosaicing groups.     

Intrinsic Shape Matching by Planned Landmark Sampling

Recently, the problem of intrinsic shape matching has received a lot of attention. A number of algorithms have been proposed, among which random‐sampling‐based techniques have been particularly successful due to their generality and efficiency. We introduce a new sampling‐based shape matching algorithm that uses a planning step to find optimized “landmark” points. These points are matched first in order to maximize the information gained and thus minimize the sampling costs. Our approach makes three main contributions: First, the new technique leads to a significant improvement in performance, which we demonstrate on a number of benchmark scenarios. Second, our technique does not require any keypoint detection. This is often a significant limitation for models that do not show sufficient surface features. Third, we examine the actual numerical degrees of freedom of the matching problem for a given piece of geometry. In contrast to previous results, our estimates take into account unprecise geodesics and potentially numerically unfavorable geometry of general topology, giving a more realistic complexity estimate.     

Virtually Documented Environments: A New Interface Paradigm for Task-oriented Access to Information

We present a suitable virtually documented environment system providing the user with high level interaction possibilities. The system is dedicated to applications where the operator needs to have his hands free in order to access information, carry out measurements and/or operate on a device (e.g. maintenance, instruction). The system merges video images acquired through a head-mounted video camera with synthetic data (multimedia documents including CAD models and text) and presents these merged images to the operator. Registration techniques allow the operator to visualise information properly correlated to the real world: this is an essential aspect in order to achieve a feeling of presence in a real environment. We increase the sense of immersion through high level Human-Computer Interaction (HCI) allowing hands-free access to information through vocal commands as well as multimodal interaction associating speech and gesture. In this way, the user can access information and manipulate it in a very natural manner. We discuss the construction of the documentation system and the requested functionalities which led to the system architecture.     

A combined alignment and registration scheme of lesions with psoriasis

A scheme that registers and aligns digital image lesions of psoriasis within and between sessions is proposed. Lesions to be tracked are found under the assumption of being the object of largest size in thematic maps produced by a two-step hierarchical classification scheme that uses the output of an expectation-maximization algorithm to obtain a classification window of optimal size. Advantage is taken of the fact that the shape and the size of lesions with psoriasis do not change very much along the time. A first alignment of the lesions is done assuming that the correspondence between points is given by equivalence of positions of pixels after translations and rotations. Finally, a combined contextual registration and alignment scheme is applied. The alignment and registration schemes both use an Extreme Value Detection Algorithm based on a retinal mapping model. The output of the scheme is satisfactory not only in terms of visual appreciation of the aligned lesions, but also because the variation within sessions in the aligned lesions resembles randomly distributed Gaussian noise.     

一维非均匀齿轮形貌点云精确配准方法

为了提高虚拟齿轮形貌点云和实测非均匀齿轮形貌点云的配准精度提出一种配准方法。首先以实测齿轮形貌点云数据为基准生成与其数量相同的虚拟齿轮形貌点云数据;再利用互相关算法求出这两组点云数据的初相位,并对虚拟齿轮形貌点云进行相位平移;最后以实测齿轮形貌点云数据为基准,重新生成一组与其点与点对应的虚拟齿轮形貌点云数据,实现两组点云数据的精确配准。实验结果表明:当周采样数目为125952时,采用一维非均匀齿轮形貌点云配准方法较迭代最近点(ICP)算法,角位移配准精度提高了0.0008°,线位移配准精度提高了4μm。该方法可提高非均匀齿轮形貌点云的配准精度。     

反思矿业权抵押备案制度

矿业权作为一种国家法定的物权,依法应当可以进行流通和转让。矿业权抵押有助于矿业权人融通资金,加大探矿采矿力度,满足国家对矿产资源的强劲需求,而对于商业银行而言,也是其参与矿业勘查开发投资、拓展业务的重要途径。本文分析了矿业权抵押的制度现状及存在问题,界定了矿业权抵押的经济关系,论述了矿业权抵押的现实意义,提出了完善我国矿业权抵押融资的制度建议。     

PCB板对准度设计能力研究

从PCB设计对位精度，制程中影响，找出影响层间对位偏差的因子，在生产过程中控制关键因子，满足PCB设计的对准度要求。提升层间对准度能力，并以30层板验证对准度控制≤0.127 mm（5 mil）。