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Search Results: 1 - 10 of 292859 matches for " 李海沧 "
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激光打标记
海沧
物理 , 1990,
Abstract: ?激光打标记是有显著经济效益的,发展前景良好的激光应用之一.这方面最早的应用是60年代中开始的硅片刻划.用激光束代替金刚石刀,在硅片上划上刻痕,然后加力使之分为所需的小片.60年代末和70年代初,美国和联邦德国生产出商品调qyag激光打标记系统,可以在金属上刻文字、图案,然而,因为新技术需要一个发展过程。新技术为人们所认识也需要一个过程,所以固体激光打标记系统为工业界采用,作为一种生产工具,是?...
基于金属化膜法的输电线路电晕损耗在线监测系统研究
王明松,海沧,罗勇芬,张源斌,,王国利,曹蕤
高压电器 , 2014,
Abstract: 在提出的基于金属化膜的输电线路电晕损耗监测方法基础上,研制了一套在线监测系统,它包括主机、导线电压采集模块和电晕电流采集模块3部分。电晕电流采集模块放置在高压输电线上,采集各分裂导线的电晕电流转化的电压信号,该信号由并联在薄膜金属镀层和分裂导线之间的采样电阻得到。电压采集模块放置在变电站内,采集输电导线的电压。2个模块的采集由GPS的秒脉冲上升沿触发同步,且均通过GPRS无线传输方式将数据传输至移动通讯网的公共端口。远端上位主机通过有线网络访问该公共端口,将其存储的电压、各分裂导线的电晕电流数据按照瞬时功率算法计算出单位长度各分裂导线的电晕损耗,以及折算线路电晕损耗。实验表明,该系统能准确测量输电线路电晕损耗。基于金属化膜的输电线路电晕损耗监测技术的研究,为后续对超特高压输电线路进行不同气候和环境条件下的电晕及其效应展开研究奠定了基础。
INVESTIGATION ON LITHIUM NIOBATE PYROELECTRIC DETECTOR
铌酸锂热释电性能的研究

Feng Xi-qi Zhang Yan-xing Li Hai-cang Shao Li-xun,
冯锡淇
,张雁行,海沧,邵黎壎

电子与信息学报 , 1982,
Abstract: Based on the experimental results obtained from both the measurement of material parameters and device responsivity, it is verified that the pyroeleetric responsivity figure of merit of LiNbO3 crystal, Mv is twice as high as that generaly acknowledged value. Furthermore, when the temperature rises, Mv slowly decreases rather than in-creases evidently with temperature as reported in certain literatures. In this paper, the output characteritics of LiNbO3 pyroeleetric detector which is irradiated by the high-power CW CO2 laser has been investigated. The results show that the maximum power density at which the output characteristics of LiNbO3 detector begin to deviate from linear range far exceeds that of LiTaO3 detector under the same conditions. We have carefully measured the intrinsic dielectric loss tg δd of LiNbO3 crystal. The value obtained can be used to estimate the detectivity limit of LiNbO3 pyroelectric detector. Detailed analysis proves that, for producing the pyroelectric detector with background limited performance, its figure of merit of LiNbO3 crystal is favorable, and no loss than those of most commonly used materials, such as TGS.
全球变暖背景下中国东部季节性冻土的变化特征及其与季风活动的可能联系
Variation of Seasonal Frozen Soil in East China and Their Association with Monsoon Activity under the Background of Global Warming
 [PDF]

,
Climate Change Research Letters (CCRL) , 2013, DOI: 10.12677/CCRL.2013.22008
Abstract:
利用国家气候中心提供的1962~2001年逐月平均土壤温度资料,通过拉格朗日插值方法得到的0℃等温线深度表征冻土深度,研究了全球变暖背景下我国东部冬季季节性冻土的时空演变特征及其与季风活动的可能联系。结果表明,我国东部季节性冻土的深度呈现出北深南浅、西厚东薄的空间分布形势,区域性差异显著。1980年以来,研究区内季节性冻土深度由深变浅,南缘线北缩,冻土退化趋势显著。季节性冻土的变化与东亚冬季风的活动关系密切,强(弱)季风年,冻土南边缘位置偏南(北),其中东部区域冻土南边缘的位置对东亚冬季风的响应最为敏感。
Using 1962-2001 monthly soil temperature data provided by National Climate Center, the depth of 0°C iso-therm obtained with Lagrange interpolation method is used to express the frozen soil depth, and the spatial and temporal variations of the frozen soil depth in East China under the background of global warming and its association with winter monsoon activity has been investigated. Results show that the seasonal frozen soil depth in East China exhibits evident regional difference. In general, the seasonal frozen soil depth is deeper in the north part and shallower in the south part, also thicker in the west part than that in east part. Meanwhile, the frozen soil depth becomes shallower with its south edge retreating northward since 1980s, which indicates a significant degrading trend of the seasonal frozen soil. Varia-tions of seasonal frozen soil have close relationship with East Asia winter monsoon. It is revealed that the south edge of the frozen soil depth experiences a southward (northward) movement in the strong (weak) winter monsoon years. In addition, the south edge of the frozen soil depth in the eastern part is more sensitive to the anomalous activity of East Asia winter monsoon.
科学家声讨胡风反革命集团

科学通报 , 1955,
Abstract: 中国科学院学部成立大会在6月10日举行了批判资产阶级唯心主义思想、声讨胡风反革命集团的座谈会。参加学部成立大会的全国著名学者极为愤慨地揭露了胡风反革命集团的阴谋罪行,集中地批判了资产阶级唯心主义,同时也检查了自己的政治警惕性不高的缺点,并一致通过了“中国科学院学部成立大会关於建议依法严惩胡风反革命集团的决议”。科学家们对胡风反革命集团的罪恶活动是极为愤怒的,会上揭发了胡风反革命分子用卑鄙手段鑽进革命队伍进行发展秘密组织、毒害青年、盗窃机密、寻找“缺口”、挑拨离间、从思想上组织上来瓦解革命队伍的各种反革命活动。
现代工业厂房的空间与环境——大连创新零部件工业园项目建筑设计体会

工业建筑 , 2006, DOI: 10.13204/j.gyjz200602011
Abstract: 以大连创新零部件工业园项目为例,阐述了现代化工业厂房设计与外部环境组合、内部空间组合和建筑造型处理之间的关系问题。
卤制温度对酱卤藏羊肉品质的影响

- , 2015, DOI: 10.13982/j.mfst.1673-9078.2015.11.039
Abstract: 为研究卤制温度对酱卤藏羊肉品质的影响,本试验分析了卤制中心温度为30、40、50、60、70、80、90、99 ℃时对藏羊后腿肉的蒸煮损失、剪切力、蛋白溶解度的影响,并采用SDS-PAGE电泳和扫描与透射电镜研究了对藏羊肉肌原纤维蛋白组分及微观结构的变化。结果表明:随着卤制中心温度的升高,蒸煮损失率由中心温度为30 ℃时的15.82%逐渐增大到99 ℃时的41.15%;剪切力随着卤制中心温度的升高而逐渐增大,到70 ℃时达到最大值,但熟化温度达到80 ℃后剪切力变小,随后又逐渐增大;蛋白溶解度随着中心温度的升高而呈逐渐降低的趋势。SDS-PAGE和透射与扫描电镜结果表明,随着卤制中心温度的升高,肌原纤维蛋白发生了蛋白降解与交联,肌原纤维束间的空隙逐渐缩小,变得更加密集、紧凑,且肌纤维直径和肌节长度逐渐缩小。因此,卤制中心温度为70 ℃时是酱卤藏羊肉品质形成的关键温度点。
The effects of internal temperature on Tibetan mutton quality during marination were investigated. The effects of internal temperature during marination (30 ℃~ 99 ℃) on the Warner-Bratzler shear force, cooking loss, and protein solubility of Tibetan mutton muscle from hind leg were analyzed. The changes in myofibrillar protein composition and microstructure of Tibetan mutton muscle were determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicated that with increasing internal temperature of marination, the cooking loss gradually increased from 15.82% at 30 ℃ to 41.15% at 99 ℃ (P < 0.05); Warner-Bratzler shear force was gradually increased to the peak value at 70 ℃ (P < 0.05). When temperature reached 80 ℃, the shear force decreased initially before it gradually increased. The protein solubility showed a slow downward trend with increasing internal temperature. The results of SDS-PAGE, SEM, and TEM indicated that with the increase of internal temperature of marination, protein degradation and crosslinking occurred in the myofibrillar tissue, the space among myofibrillar bundles gradually decreased, myofibrillar bundles became denser and more compact, and myofibril diameter and sarcomere length decreased gradually. Therefore, an internal temperature of 70 ℃ is the key temperature point for the quality of marinated Tibetan mutton.
对构建和谐小区的思考
Thinking of Constructing the Harmonious Communities
 [PDF]

黄韶, , 黄国华
Modern Management (MM) , 2011, DOI: 10.12677/mm.2011.12018
Abstract: 当前,越来越多的人已经认识到构建和谐小区对构建和谐社会的重要意义。本文对构建和谐宜居小区的重要性做了清晰的阐述,并从邻里关系、技术、物业管理等角度提出了有效的构建办法与路径。
Now, more and more people have realized that harmonious communities are very important to build a harmonious society. The article has expounded the importance of the harmonious and comfortable communities, and suggested that we should construct the harmonious communities by improving neighbor relationship, technology and property management.
基于三像素彩色共生矩阵的图像检索
Content-Based Image Retrieval Using Three Pixels Color Co-Occurrence Matrix
 [PDF]

刘广, 佐勇
Computer Science and Application (CSA) , 2012, DOI: 10.12677/CSA.2012.22016
Abstract: 本文提出一种新颖的颜色特征描述子——三像素彩色共生矩阵。它通过描述三个相同像素的空间相关性来实现基于内容的图像检索。它首先将彩色图像从RGB颜色空间转换到Lab均匀颜色空间,然后将彩色图像量化为90种颜色,并且对图像进行共生矩阵分析,最后采用90维特征向量来描述图像特征。实验结果表明,三像素彩色共生矩阵的检索性能优越于灰度共生矩阵和MPEG-7颜色布局描述子。它能够描述图像的颜色结构分布信息,能够整合颜色和纹理特征。
A new color descriptor, namely three pixels color co-occurrence matrix, is proposed in this paper. It imple- ments content-based image retrieval via representing the spatial correlation of the same three pixels. The proposed de- scriptor first converts color image from RGB color space to Lab color space. The original color image is then quantized into 90 colors and co-occurrence matrix used for image analysis. Finally, 90-dimensional vector is adopted to describe image features. Image retrieval experimental results shown that the performances of the proposed descriptor are better than that of gray level co-occurrence matrix and MPEG-7 color layout descriptor. It has good discriminative power of color structure distribution, and can combine the color and texture features.
单轴电液角振动台的迭代复现控制研究
Study on Iteration Reproduction Control of Single-axis Electro-hydraulic Angular Vibration Table
 [PDF]

袁立鹏, 袁立铭,
International Journal of Mechanics Research (IJM) , 2012, DOI: 10.12677/IJM.2012.12003
Abstract:

液压角振动台是十分复杂的非线性系统,应用传统的控制系统设计方法很难满足其控制要求。针对随机振动要求振动试验系统具有高频响性能的特点,建立了阀控马达系统的数学模型,根据极点配置原理设计了有效拓展系统频宽的三状态控制器。提出基于自适应滤波器频响函数辨识方法进行复合迭代控制,并研究了不同阀控马达频响函数估计方法对随机复现振动控制精度的影响效果。将仿真结果与实验数据进行对比分析,验证了三状态控制策略拓展系统频宽的有效性和自适应滤波器频响函数估计的准确性。

Hydraulic angular vibration table is a kind of complex and non-linear system. Applying traditional controller to the angular vibration system, it is difficult to make the control performance to a high level. Aiming at the demand of high frequency response for the random vibration system, this paper built up the mathematical model of hydraulic motor controlled by valves, and according to the principle of pole assignment, this paper designed the three variables controller for the electro-hydraulic servo angular vibration table, which can extend the system bandwidth. This paper proposes the random vibration composite iteration control algorithm based on the frequency response estimator using self-adapting filter. The control precision of the different frequency response estimators was analyzed. Comparing simulation with experiment, the results show that three variables controller is favorable to improve system’s frequency response and the frequency response estimator using self-adapting filter is accurate for random vibration replication control.


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