共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
目的 比较分析CRT,LCD,PDP显示静、动态图像的能力.方法 阐述各种显示技术的原理,从影响静、动态画面显示的因素出发,分析不同显示设备在不同领域的使用状况.结果 给出了不同显示设备的静、动态画面的显示能力,以及它们的应用领域.结论 不同的显示器件在两种画面的显示上各有优缺点,应根据实际的使用情况而选择合适的显示器件. 相似文献
4.
5.
目前的三维显示技术,如视差屏障显示、柱镜光栅显示、多投影显示、扫描立体显示,通过运用双目视差、视觉暂留效应使人眼获得三维图像。这些显示技术将物体显示在二维平面上,并不是在空间中重构出三维物体,丢失了深度信息,易引起聚焦辐辏调节冲突。体三维显示和全息显示可以在空间中重构出三维物体,但所需处理的数据量巨大,目前在计算速度、传输速率等方面都有技术限制。基于空间三维物体重构的光场显示技术利用光场在空间中重构出三维物体,主要包括层叠光场显示、快门光场显示、集成成像光场显示和矢量光场显示。该文分析了各种光场显示技术的原理和特点,认为矢量光场显示技术具有广阔的发展前景。 相似文献
6.
7.
单片机控制LED屏汉字显示技术浅析 总被引:3,自引:0,他引:3
现代生活中,LED显示屏已经越来越多的用于显示文字、图形、图像、动画、市场行情、视频等各种信息,广泛应用于商场促销显示、新闻与广告显示、车站机场班次时间资讯显示等。文中针对单片机控制LED汉字显示屏技术进行介绍,并从基本原理、方案论证、具体实施等方面进行详细阐述。 相似文献
8.
以液晶、等离子等显示器件为主的平板显示器以其清晰逼真、超薄量轻和数字化的优势逐渐成为显示设备的"宠儿".分解力是显示器件的重要指标,本文对新型的平板显示器件的分解力进行了讨论,并给出了三种测试平板显示器件分解力的方法. 相似文献
9.
本文提出一种根据米字格汉字显示原理研制的、能同时显示多个汉字的显示系统。内容包括显示系统的基本原理、硬件及软件的实现方法,以及液晶显示器的性能测试。 相似文献
10.
为了实现地质体的真实感显示,利用OpenGL中的纹理映射、光照、反走样、雾化等实现地质体的三维可视化显示,并且在静态模型的基础上通过OpenGL中的平移、旋转、缩放实现动态的显示,提高了图形显示速度,使模型达到更加真实的效果. 相似文献
11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness. 相似文献
12.
The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time. 相似文献
13.
大肠杆菌pheA与tyrB基因的克隆与串联表达 总被引:3,自引:0,他引:3
为探讨用基因工程的手段改良苯丙氨酸的发酵菌株,采用聚合酶链反应(PCR)的方法,从大肠杆菌总DNA中克隆得到了编码苯丙氨酸合成途中的两个关键酶基因-即分枝酸变位酶(CM)/预苯酸脱水酶(PD)基因pheA与苯丙氨酸转氨酶(PAT)基因tyrB,在大肠杆菌中进行了这两个基因的单个和串联表达。pheA和tyrB基因分别都能在λ噬菌体的PR启动子之后得到较大量的表达,在SDS-PAGE上出现清晰的条带, 相似文献
14.
介绍了四川溲疏属植物20种,5变种及1栽培变型,每种均有文献考证、学名订正、特征集要及产地和生境,新分类群D.leiboeneie P.He et L.C.Hu, D.piloea var.longiloba P.He et L.C.Hu,D.jinyangensis P.He eL L.C.Hu及D.longifolia var.deneitomentosa P.He et L.C.Hu均有详细拉丁文描述并附模式标本照片,还记录了两个四川省新分布种:D.bodiaieri Rehd.,D.rehderiana C.K.Schn.,对伞花亚组Subsect Cymosae Rehd.中建立的新系(Ser.Multiradiatae P.He,Ser.Pauciradiatae P.He)作了拉丁文补充描述。 相似文献
15.
Java这门编程语言以及相关技术的使用得到快速的增长;现在大约有700多万台计算机正在运行Java应用程序,有近100万的Java开发人员,世界上所有的企业中,几乎有一半正在开发 Java应用程序。Java成功的理由是很自然的,Java是真正与平台无关的,它是适合于任何操作系统的一种通用的编程语言;Java是完全面向对象的,这在软件工程和组件技术方面有了很大的进步;Java的安全模型是成熟的,这与其他容易感染病毒的模型系统形成了鲜明的对比。 相似文献
16.
QING Hai-ruo 《成都理工大学学报(自然科学版)》2004,31(6)
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction. 相似文献
17.
阳蝇属是蝇科最大的属之一,迄今全世界已知阳蝇属约666种,分布于世界各大地理区。近年来对阳蝇属种团和类群的研究,发现在我国阳蝇属中存在一些异名问题。在我国阳蝇属已知226种中,发现小兴安阳蝇(Helina xiaoxinganna Xue,2001)、茂县阳蝇(Helina maoxianica Feng,2008)、后曲阳蝇(Helina postiflexa Xue,Feng& Tong,2008)、团宝山阳蝇(Helina tuanbaoshanica Feng,2007)、兴凯阳蝇(Helina xingkaihuica Feng& Ye,2007)和错那阳蝇(Helinacuonaica Feng&Xu,2008)等6个种存在同物异名问题,并根据模式标本及原始文献,指出了同物异名的理由,明确给予了订正。 相似文献
18.
19.
Yuriko Aoki 《华南师范大学学报(自然科学版)》2014,46(6):135-135
The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to 相似文献
20.
记述我国蜈蚣目Scolopendromorph耳孔蜈蚣亚科Otosigminae耳孔蜈蚣属Otostigmus(耳孔蜈蚣亚属Otostigmus)6种.其中对平耳孔蜈蚣Otostigmus(Otostigmuts)politus Karsch、糙耳孔蜈蚣O.(O.)scaber Porat和多刺耳孔蜈蚣O.(O.)aculeatus Hasse进行了重新描述;马氏耳孔蜈蚣O.(O.)martensi Lewis和贝氏耳孔蜈蚣O.(O.)beroni Lewis为2个我国新记录;刘易斯耳孔蜈蚣O.(O.)lewisi sp.nov.为1新种.附有各种特征图,并编制了种检索表. 相似文献