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Search Results: 1 - 10 of 33084 matches for " 骆曜光 "
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sl型水套炉腐蚀原因探讨
,李素碧
天然气工业 , 1992,
Abstract: ?sl型水套炉是ce气田主要的加热设备,由于设计和使用中的一些原因,使水套炉受到不同程度的腐蚀,有的还相当严重.本文对腐蚀原因进行了探讨并提出了改进建议.
碱土金属离子对硼铝酸盐玻璃发光性能的影响
,张金朝,宋鹂,志平
华东理工大学学报 , 2011,
Abstract: 以等离子显示板(PDP)用蓝色荧光粉BaMgAl10O17∶Eu2+(BAM)为基础,加入B2O3及不同的碱土金属离子Mg2+,Sr2+,Ba2+,采用高温熔融法制备了硼铝酸盐透明发光玻璃。光谱分析表明不同碱土金属离子硼铝酸盐透明玻璃在紫外和紫蓝光区域均可有效激发,于蓝光处产生强光发射。发射峰按照加入Mg2+,Ba2+,Sr2+的顺序发生红移,发光强度按照加入Mg2+,Sr2+,Ba2+的顺序依次减弱。
进口具有预旋流动的亚音速轴对称环形扩压器粘性流场计算
汪集,凌志
工程热物理学报 , 1983,
Abstract: 环形扩压器是一个重要的气动元件.装在透平级后的轴向式或轴径式环形扩压器,通过它的排气扩压过程,可以降低透平级背压,在同样透平进口参数条件下,提高透平作功能力,减少余速损失,使整个透平机效率得到提高.
一种新型的基于离散化宏块及螺旋扫描的视频数据打包算法
,,刘汝
中国图象图形学报 , 2003, DOI: 10.11834/jig.2003012511
Abstract: 在研究传统视频数据打包算法中所采用的光栅扫描方式的局限性基础上,融合离散化宏块和螺旋扫描,融合这两种算法提出了一种新的视频数据打包算法,该算法首先按照某种规则离散化编码宏块,然后再从人眼感兴趣的中心区域开始,螺旋形步进打包.理论和试验都证明了这种新型的打包算法一方面可以有效地提高数据包抗丢包、抗误码的性能,另一方面可以使得数据包具有一定的可伸缩性,该算法比传统的打包算法在解码输出质量上具有明显的提高。
长距离管道内壁涂层工艺

天然气工业 , 1983,
Abstract: ?管道内壁涂层是降低管道摩阻损失,提高输送效率,以及防腐的重要措施。涂层性能好坏,除涂料本身的性能外,涂敷工艺也很关键。涂敷工艺有预制厂单根管预涂敷和管道内壁整体涂敷两种。对于输送介质有腐蚀性的管道,最好是用整体涂敷工艺,使焊缝处也受到涂层的保护。在管道内壁整体挤涂室内试验的基础上,1982年11月在川西南矿区的协作下,对347米φ159×7″的卤水管道进行了施工试验,取得了初步成效。
管道内壁涂敷新工艺的现场应用

天然气工业 , 1985,
Abstract: ?本文介绍了管道内壁涂层的防腐作用及这项涂敷新工艺的三个组成部份:管道内壁的表面处理;管子内壁预喷涂技术;管道(包括焊缝)内壁整体挤涂工艺。还介绍了涂料与这项技术的室内试验、现场应用情况。
A Screen Image Compression Technology Based on Sub-blocking with Dynamic Threshold
基于动态阈值分块算法的屏幕图象压缩技术

朱芳宇,,
中国图象图形学报 , 2003,
Abstract: Compression algorithm for screen images, which comes from the Computer Screen, is an important task in the Screen Share technology. Traditional methods are based on the algorithms such as RLE, LZW or JPEG directly, which cannot meet the requirements of both the quality of recovery image and compression ratio to compress screen image respectively. High compression ratio algorithms (JPEG) result in a low quality of image, while no-distortion algorithm (RLE, LZW) leads to a low compression ratio. In order to resolve this contradiction, an effective compression algorithm based on dynamic threshold sub-blocking is proposed in this paper. Before the image compression, Screen image is divided into four sorts of blocks by certain provided rules first, which are named as Pure-color Blocks, Text Blocks, Icon Blocks, and Image Blocks. Then these blocks are compressed separately depended on their characteristic so as to ensure that the quality of recovery image is the overall best and the compression ratio is the highest. Pure-color Block, Text Block, and Icon Block are compressed with no-distortion compression algorithm, and Image Block is compressed with JPEG algorithm. Result of experiments shows that our algorithm has improved quality of recovery image, higher compression ratio, and higher compressed speed than traditional algorithm.
一种类DCT的8×8整数变换
田晓华,,
中国图象图形学报 , 2004, DOI: 10.11834/jig.200408176
Abstract: 整数变换因其高效的计算性能而被最新的国际视频编码标准H.264采纳,我国的第一个音视频编码标准AVS也将采用8×8整数变换。变换模块的性能直接影响编解码器的性能,所以选择性能优异的变换基尤为重要。本文在8×8类DCT整数变换原理的基础上,提出了一种结合能量集中率和去相关效率的变换基变换性能评价方法,同时考虑计算复杂度,在理论上选出了几组性能较好的整数变换基。通过分析视频序列测试结果,讨论得出不同变换基的适用场合,并且验证了理论评价结果的正确性
基于动态阈值分块算法的屏幕图象压缩技术
朱芳宇,,
中国图象图形学报 , 2003, DOI: 10.11834/jig.200309372
Abstract: 计算机屏幕图象压缩一直是屏幕共享技术中的关键问题,而现有算法一般是直接应用传统的RLE,LZW或JPEG算法,但由于这几种算法在对计算机屏幕图象进行压缩时,均无法兼顾恢复质量与压缩比的要求.为此提出了一种基于动态阈值分块的高效压缩算法,该算法首先将屏幕图象按照某种规则划分为纯色块、文字块、图标块和图象块4种特征块,然后针对特征块特点采用相应的压缩算法,以保证压缩算法在恢复质量与压缩比上能同时达到最佳.实验结果表明,该算法图象恢复质量较好,压缩比较大,压缩速度较快,整体性能优于当前现有的屏幕压缩算法,具有广泛的应用前景.
城市轨道交通预制短板轨道的实验方案设计与分析
Design and Analysis of In-Door Experiments of Prefabricated Short Slab Track in Urban Rail Transit
 [PDF]


Open Journal of Transportation Technologies (OJTT) , 2016, DOI: 10.12677/OJTT.2016.56021
Abstract:
预制短板节段拼装方案的浮置板轨道有效克服了常规钢弹簧浮置板轨道结构施工进度慢、施工方式受限等问题而得到推广。但结构上的这种变化引起其在列车荷载作用下受力特征和力学状态的改变,进而影响到轨道结构的强度安全、稳定性以及使用寿命。本文结合室内试验需求和目标,对预制短板轨道的室内试验方案设计、数据分析方法和典型测试结果等做一简要的介绍。
The floating slab track of the prefabricated short slab installation solution effectively overcomes the defects such as time-consuming in construction and limiting the methods of construction, and so they are widely used. But those changes in structures cause the change of force characteristics and mechanics status under the train loads, and affect their strength safety, stability and service life. Combing the in-door experiments’ requirement and objectives, the design of the experiments solutions to the prefabricated slab track, data analysis method and typical measurement result etc. are introduced briefly in this paper.
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