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Search Results: 1 - 10 of 255907 matches for " 李茂 "
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机器视觉的像素校准
Machine Vision Pixel Calibration
 [PDF]

,
Artificial Intelligence and Robotics Research (AIRR) , 2014, DOI: 10.12677/AIRR.2014.32005
Abstract:

描述了一种机器视觉校准的方法。在基于小孔成像相机模型的基础上,使用平板拍取若干张照片进行校验。采用几何坐标变换,并且结合齐次图形学,考虑相机镜头畸变的情况下,计算出相机的内参和外参。此类方法可以广泛御用使用于机器视觉的相机的校准。
We describe a method for the machine vision calibration. Based on pinhole camera model, we calibrate several pictures taken by a tablet. With geometry coordinate system transformation and combination of homogeneous graphics, this method calculates the camera intrinsic and extrinsic parameters considering of lens distortion. This method could be used for machine vision camera calibration.

河南省耕地和粮食灰色关联分析

地理科学进展 , 2002, DOI: 10.11820/dlkxjz.2002.02.009
Abstract: 收集整理1949~1999年河南省耕地、人口、粮食和复种指数等资料,定量分析耕地的数量变化、质量状况和耕地减少的形式,用一元线性回归法预测人口变化趋势,对粮食生产与其影响因素进行灰色关联分析和相关分析,提出外延式和内涵式开发耕地资源增产粮食的途径,对粮食单产和耕地复种指数进行回归分析.
国际碳排放交易市场及我国的对策分析
Analysis of the International Carbon Emission Trading Market and China’s Countermeasures
 [PDF]

陈健, 吴楠,
World Economic Research (WER) , 2015, DOI: 10.12677/WER.2015.42004
Abstract:
本文通过介绍近期国内外发展碳排放交易市场的历程,揭示出其发展中所存在的问题,借鉴欧美国家成功建立碳排放交易市场的经验,为努力完善国内统一的碳排放交易市场体系提出建议。针对我国的国情,为改变我国在全球碳排放交易市场的不利位置,本文也粗略地介绍了我国在碳排放交易市场应采用何种对策,以适应不断变化的碳排放交易市场。
This paper describes the history of China’s carbon emission trading market development, and re-veals its problems existing. Then it analyzes experiences of the successful establishment of the European and American carbon emission trading market, to make suggestions for completing uni-fied carbon emission trading market in China. At last, in view of China’s national conditions, this paper recommends the countermeasures adopted to fit the changing carbon emission trading market.
石墨包裹纳米铁晶粒的纯化及表面改质程序之初步研究
Preliminary Study on the Purification and Surface Modification Procedures of Graphite Encapsulated Iron Nanoparticles
 [PDF]

尚实,
Hans Journal of Nanotechnology (NAT) , 2015, DOI: 10.12677/NAT.2015.54009
Abstract:
石墨包裹纳米金属晶粒(Graphite Encapsulated Metal nanoparticles, GEM)是一种在1993年偶然间发现的新超威复合材料,外层由吸附效果佳的多片石墨层所组成,内核则包裹有纳米金属晶粒,而由于铁、钴和镍等铁磁性金属具有催化碳变为石墨的能力,故以合成石墨包裹纳米铁磁性金属晶粒的研究最为普遍。本研究系以石墨包裹纳米铁晶粒(FeGEM)做为主要研究材料,针对该材料的合成纯化步骤及表面改质程序,进行操作条件的分析改良,成功发现使用盐酸进行FeGEM颗粒的酸溶纯化步骤可降低产物中氧化物杂质的产生,并可保留最佳包裹良率;而利用硝酸进行升温回流程序,则可以在较低的升温条件(80℃)下达到改质FeGEM表面特性的目的,使颗粒表面由亲油性转变为亲水性,且可稳定悬浮于去离子水或乙醇等极性溶剂中24小时以上,有效解决颗粒容易团聚的缺点,大幅提升FeGEM的应用潜力。
The novel ultrafine material of graphite encapsulated metal (GEM) nanaoparticles was first dis-covered in 1993. The outer shells of GEM material are composed of graphitic layers with superior adsorbing property and the inner core is composed of nanocrystalline metal. Due to the excellent catalytic ability of ferromagnetic metal to transform carbon to graphite, the researches about synthesizing graphite encapsulated ferromagnetic metal nanoparticles are most common. In this study, we focused on the purification and surface modification procedures of FeGEM. It is found that the purification steps with hydrochloric acid can reduce the impurities of oxides and preserve high percentage of well-encapsulated nanoparticles. We also found that after the purification, the following refluxing procedure with nitric acid under 80?C can modify the surface of FeGEM nanoparticles from hydrophobicity to hydrophilicity and maintain the suspension of FeGEM in water or ethanol for more than 24 h. The modification processes not only overcome the agglomeration problem of FeGEM nanoparticles but also enhance the potential applications of the material.
Wronsky行列式与具有最大亏量和的亚纯函数
Wronsky Determinant and Meromorphic Functions with Maximal Deficiency Sum
 [PDF]

谢佳, 邓炳,
Pure Mathematics (PM) , 2016, DOI: 10.12677/PM.2016.65057
Abstract:

f是复平面上满足\"\" 的超级有穷的超越亚纯函数, k为正整数, \"\"fk+1 个线性独立的小函数,且满足\"\" 为常数,\"\" ,则有

\"\"

Let f be a transcendental meromorphic function satisfying\"\" , and k is a positive integer; let\"\" be linearly independent small functions of f? , and \"\" is a constant; let\"\" . Then

\"\"

厦门卷烟厂“七五”技改系统工程的研究与实施

系统工程理论与实践 , 1991,
Abstract: 厦门卷烟厂是中国烟草行业在特区中唯一的厂家,其税利收入在厦门市的财政收入中占有极其重要的位置,仅1987年税利达1.7亿元,占全市财政收入的三分之一强。为了进一步提高该厂的生产能力,争取更大的经济效益,中国烟草总公司批准厦门卷烟厂在《七五》期间进行全面技术改造,整个工程投资额为1980万元,这也是厦门市“七五”期间老企业改造重点项目。
卤虫在养殖中的应用

海洋科学 , 1980,
Abstract: 卤虫(Artemia salina L.)的研究,已有二百多年的历史。直到本世纪三十年代,美国的Seale(1933)和挪威的Rollefsen(1939)发现卤虫的无节幼体是鱼类幼体的最好饵料以后,卤虫就逐渐成了海水养殖中最主要的活饵料来源。不少国家已开始大量培养卤虫。美国夏威夷州的水产养殖计划中,就把卤虫列为第一位,东南亚一些国家人工培养卤虫也取得很大成绩。 卤虫具有很高的营养价值,繁殖能力强,能广泛适应各种环境,而且容易培养。尤其是
聚能射流在侵彻过程中侧向失稳问题

高压物理学报 , 1988, DOI: 10.11858/gywlxb.1988.04.006
Abstract: 本文用侧向气-固两相气动力学原理和弹塑性杆运动时失稳问题,解释了射流在侵彻过程中的侧向失稳现象。
基于受控拉格朗日函数的Pendubot镇定控制器设计

控制与决策 , 2010,
Abstract: 基于受控拉格朗日函数,对竖直面内两自由度Pendubot设计镇定控制器.由于该系统的驱动变量是原始动能的循环变量,当受控动能继续保持同一个循环变量时,匹配条件中的动能方程退化为一个常微分方程.由此得到的非线性光滑反馈控制律,可实现一类两自由度Pendubot局部渐近镇定.
田庄选煤厂选煤工艺改造研究

煤炭工程 , 2015, DOI: 10.11799/ce201506009
Abstract: 针对田庄选煤厂原有工艺系统存在的系统对煤质适应能力差,介耗、电耗高,设备故障率高,以及入洗能力低等问题,通过煤质分析对其进行了工艺改造,确定了块煤斜轮分选,末煤重介旋流器分选,煤泥粗煤泥分选机分选和细煤泥浮选的选煤工艺,介绍了工艺特点,工艺布置和设备选型情况。
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