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Multi-features Based Approach for Moving Shadow Detection 被引量:4
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作者 周宁 周曼丽 +1 位作者 许毅平 方宝红 《Journal of Donghua University(English Edition)》 EI CAS 2004年第6期76-80,共5页
In the video-based surveillance application, moving shadows can affect the correct localization and detection of moving objects. This paper aims to present a method for shadow detection and suppression used for moving... In the video-based surveillance application, moving shadows can affect the correct localization and detection of moving objects. This paper aims to present a method for shadow detection and suppression used for moving visual object detection. The major novelty of the shadow suppression is the integration of several features including photometric invariant color feature, motion edge feature, and spatial feature etc. By modifying process for false shadow detected, the averaging detection rate of moving object reaches above 90% in the test of Hall-Monitor sequence. 展开更多
关键词 MOVING SHADOW detection multi - features MOVING OBJECT DETECTION
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The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) 被引量:40
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作者 Xiang-Qun Cui Yong-Heng Zhao +52 位作者 Yao-Quan Chu Guo-Ping Li Qi Li Li-Ping Zhang Hong-Jun Su Zheng-Qiu Yao Ya-Nan Wang Xiao-Zheng Xing Xin-Nan Li Yong-Tian Zhu Gang Wang Bo-Zhong Gu A-Li Luo Xin-Qi Xu Zhen-Chao Zhang Gen-Rong Liu Hao-Tong Zhang De-Hua Yang Shu-Yun Cao Hai-Yuan Chen Jian-Jun Chen Kun-Xin Chen Ying Chen Jia-Ru Chu Lei Feng Xue-Fei Gong Yong-Hui Hou Hong-Zhuan Hu Ning-Sheng Hu Zhong-Wen Hu Lei Jia Fang-Hua Jiang Xiang Jiang Zi-Bo Jiang Ge Jin Ai-Hua Li Yan Li Ye-Ping Li Guan-QunLiu Zhi-Gang Liu Huo-Ming Shi Zheng-Hong Tang Qing-Sheng Tao Xiang-Yan Yuan Chao Zhai Jing Zhang Yan-Xia Zhang Yong Zhang Ming Zhao Fang Zhou Guo-Hua Zhou Jie Zhu Si-Cheng Zou 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2012年第9期1197-1242,共46页
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, also called the Guo Shou Jing Telescope) is a special reflecting Schmidt telescope. LAMOST’s special design allows both a large aperture (effecti... The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, also called the Guo Shou Jing Telescope) is a special reflecting Schmidt telescope. LAMOST’s special design allows both a large aperture (effective aperture of 3.6 m–4.9 m) and a wide field of view (FOV) (5°). It has an innovative active reflecting Schmidt configuration which continuously changes the mirror’s surface that adjusts during the observation process and combines thin deformable mirror active optics with segmented active optics. Its primary mirror (6.67m×6.05 m) and active Schmidt mirror (5.74m×4.40 m) are both segmented, and composed of 37 and 24 hexagonal sub-mirrors respectively. By using a parallel controllable fiber positioning technique, the focal surface of 1.75 m in diameter can accommodate 4000 optical fibers. Also, LAMOST has 16 spectrographs with 32 CCD cameras. LAMOST will be the telescope with the highest rate of spectral acquisition. As a national large scientific project, the LAMOST project was formally proposed in 1996, and approved by the Chinese government in 1997. The construction started in 2001, was completed in 2008 and passed the official acceptance in June 2009. The LAMOST pilot survey was started in October 2011 and the spectroscopic survey will launch in September 2012. Up to now, LAMOST has released more than 480 000 spectra of objects. LAMOST will make an important contribution to the study of the large-scale structure of the Universe, structure and evolution of the Galaxy, and cross-identification of multiwaveband properties in celestial objects. 展开更多
关键词 techniques: wide field telescope - active optics - multi fiber - spectroscopy survey - data reduction
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A Comparative Study of Acute Hemodynamic Effects of Multi -site Cardiac Pacing in patients with cardiac function NYHA class ⅠtoⅡ without bundle branch block 被引量:2
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作者 朱参战 崔长琮 +5 位作者 张全发 薛小临 刘维维 刘引会 《South China Journal of Cardiology》 CAS 2001年第2期101-105,共5页
Objective To compare the acute hemodynamic effects of five different pacing modes in patients with cardiac function NYHA class Ⅰ to Ⅱ without bundle branch block (BBB). Methods This study included 12 patients (SSS ... Objective To compare the acute hemodynamic effects of five different pacing modes in patients with cardiac function NYHA class Ⅰ to Ⅱ without bundle branch block (BBB). Methods This study included 12 patients (SSS 7, Ⅲ°AVB 5) undergoing pacemaker implantation. Right ventricular apex (RVA), right ventricular outflow tract (RVOT), right ventricular bifocal (RV-Bi), left ventricular base (LVB) and bi -ventricular (Bi-Ⅴ) pacing at 60 -80 ppm were done in VVI mode prior to implantation of DDD pacemaker. The cardiac index (CI), mean pulmonary artery pressure (mPAP) and pulmonary capillary wedge pressure (PCWP) were measured with Swan - Ganz thermodilution catheter after 5 minutes of each pacing mode. Results (1) Comparing to pacing at RVA (CI: 2. 41± 0. 38 L/min per m2, PCWP: 16. 7 ±3.3 mmHg), the CI increased and the PCWP decreased significantly in pacing at RVOT(CI: 2. 63 ± 0.46, PCWP: 13. 8±2. 3), LVB(CI: 2. 78±0.52, PCWP: 14. 4±3.1), RV-Bi(CI: 2. 83±0.57, PCWP: 12. 8± 2. 5) and Bi -Ⅴ pacing (CI: 2. 94± 0.60, PCWP: 12. 7±2. 5), P < 0. 01, respectively. (2) The CI of RV-Bi and Bi-Ⅴ pacing was higher than that of RVOT and LVB pacing, the PCWP was lower, P < 0. 05, respectively. (3) There was no significant difference between RV - Bi pacing and Bi-Ⅴ pacing in CI and PCWP. Conclusion There is no significant difference between RV - Bi pacing and Bi -V pacing in the acute hemodynamic effects; however,dual - site pacing is much better than single site pacing in that aspect for patients with cardiac function NYHA class Ⅰ to Ⅱ without BBB. Among single site pacing, the RVOT and LVB pacing is better than RVA pacing in cardiac function. 展开更多
关键词 multi - site cardiac pacingHemodynamics
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Research on A Master - slave Multi - microcomputers Control System for Hollow Spindle Fancy Yarn Spinning Machine
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作者 李志蜂 陈子展 阵瑞琪 《Journal of China Textile University(English Edition)》 EI CAS 1999年第1期49-52,共4页
In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardwar... In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology. 展开更多
关键词 hollow SPINDLE FANCY YAM spinning machine mechatrvnical fusion MASTER - SLAVE multi - microcomputers control system PC - BUS.
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On the Representation of Multi-layer Woven Structure
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作者 易洪雷 丁辛 《Journal of China Textile University(English Edition)》 EI CAS 1999年第3期14-16,共3页
A quantitative method is developed to identify the structures of multi-layer woven fabric in this study. Six structural parameters are selected to represent the fabric structure. With some design criteria for the rein... A quantitative method is developed to identify the structures of multi-layer woven fabric in this study. Six structural parameters are selected to represent the fabric structure. With some design criteria for the reinforcement of textile composites, the relationships among the structural parameters are derived for different binding patterns of the fabric structure. The conditions, which meet the requirements of structural cell stability,are also discussed. 展开更多
关键词 multi - layer woven FABRIC structural parame-ter BINDING PATTERN TEXTILE composite .
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Computer-aided Pattern Design of Multi-bar Warp Knitted Fabrics
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作者 李炜 《Journal of China Textile University(English Edition)》 EI CAS 2000年第1期85-87,共3页
To meet the development trend of multi-bar warp knit-ting machine towards high-speed,advanced technologyand computer control and the requirements of variousproducts with small quantity,there are many researcheson the ... To meet the development trend of multi-bar warp knit-ting machine towards high-speed,advanced technologyand computer control and the requirements of variousproducts with small quantity,there are many researcheson the computer-aided pattern design of multi-barwarp knitted fabrics.In terms of the special propertiesof the computer-aided pattern design of multi-barwarp knitted fabrics,the Object Oriented Program(OOP)programming-Object Windows class Library(OWL)programming is selected.According to thecharacters of the OWL programming,various functionsare defined.Pattern design and technical parameters canbe output,which offers a great convenience for the fac-tory. 展开更多
关键词 multi - bar WARP KNITTED fabric computer -aided PATTERN design PATTERN Object Windows class Library (OWL) programming.
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MODS: A Novel Metaheuristic of Deterministic Swapping for the Multi-Objective Optimization of Combinatorials Problems
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作者 Elias David Nifio Ruiz Carlos Julio Ardila Hemandez +2 位作者 Daladier Jabba Molinares Agustin Barrios Sarmiento Yezid Donoso Meisel 《Computer Technology and Application》 2011年第4期280-292,共13页
This paper states a new metaheuristic based on Deterministic Finite Automata (DFA) for the multi - objective optimization of combinatorial problems. First, a new DFA named Multi - Objective Deterministic Finite Auto... This paper states a new metaheuristic based on Deterministic Finite Automata (DFA) for the multi - objective optimization of combinatorial problems. First, a new DFA named Multi - Objective Deterministic Finite Automata (MDFA) is defined. MDFA allows the representation of the feasible solutions space of combinatorial problems. Second, it is defined and implemented a metaheuritic based on MDFA theory. It is named Metaheuristic of Deterministic Swapping (MODS). MODS is a local search strategy that works using a MDFA. Due to this, MODS never take into account unfeasible solutions. Hence, it is not necessary to verify the problem constraints for a new solution found. Lastly, MODS is tested using well know instances of the Bi-Objective Traveling Salesman Problem (TSP) from TSPLIB. Its results were compared with eight Ant Colony inspired algorithms and two Genetic algorithms taken from the specialized literature. The comparison was made using metrics such as Spacing, Generational Distance, Inverse Generational Distance and No-Dominated Generation Vectors. In every case, the MODS results on the metrics were always better and in some of those cases, the superiority was 100%. 展开更多
关键词 METAHEURISTIC deterministic finite automata combinatorial problem multi - objective optimization metrics.
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Pressure Gradient Force,Saffman Lift,and Magnus Lift on the Fiber-like Particle in Fluid 被引量:5
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作者 朱泽飞 林建忠 《Journal of China Textile University(English Edition)》 EI CAS 2000年第2期23-27,共5页
Flher-like particle suspensions are common in both na-ture and industry, but there is little work reported on it.The forces acting on the fiber - like particle in fluid arestudied in this paper, and the Magnus lift, S... Flher-like particle suspensions are common in both na-ture and industry, but there is little work reported on it.The forces acting on the fiber - like particle in fluid arestudied in this paper, and the Magnus lift, Saffman lift,pressure gradient force, and then the dynamics modelhave been received. The numerical study of the simpleshear flow past the cylinders shows that the particles ’motion is controlled by the vortex. 展开更多
关键词 multi - phase FLUID FIBER - LIKE PARTICLE FORCE analysis
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文昌13-1油田多氢酸酸化技术研究 被引量:2
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作者 李黎明 陈冀嵋 +1 位作者 刘怡衫 张燕明 《吐哈油气》 2009年第3期243-246,共4页
文昌13-1油田为低孔低渗砂岩油气藏,采用注水保持压力方式开采。存在注水压力高,地层污染严重等问题。针对这一现状,论文在分析储层特征、污染成因的基础上,研究了多氢酸酸化技术,多氢酸酸化酸液由前置液、处理液、后置液组成。并对酸... 文昌13-1油田为低孔低渗砂岩油气藏,采用注水保持压力方式开采。存在注水压力高,地层污染严重等问题。针对这一现状,论文在分析储层特征、污染成因的基础上,研究了多氢酸酸化技术,多氢酸酸化酸液由前置液、处理液、后置液组成。并对酸液体系作了性能评价。该酸液体系具有表面张力低、稳定铁的能力强、缓蚀效果好、稳定粘土的能力强、易于反排、对储层伤害小等优良性能。多氢酸具有的优势对海上油田的酸化具有重要意义。 展开更多
关键词 酸化 多氢酸 低渗透油藏 文昌油田
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总氮含量分析方法比较及黑龙江典型淡水养殖池塘和自然水域总氮含量的变化 被引量:4
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作者 黄丽 覃东立 +4 位作者 吴松 陈中祥 高磊 黄晓丽 王鹏 《水产学杂志》 CAS 北大核心 2018年第4期37-42,共6页
应用Multi N/C2100S分析仪与紫外-可见分光光度计对1个有证标准样品和6个实际水样总氮含量进行对比实验,予以验证。结果表明:两种仪器对已知浓度的有证标准样品测得的平均值接近真值,RSD<1%、相对误差<5%,结果准确度和精密度无显... 应用Multi N/C2100S分析仪与紫外-可见分光光度计对1个有证标准样品和6个实际水样总氮含量进行对比实验,予以验证。结果表明:两种仪器对已知浓度的有证标准样品测得的平均值接近真值,RSD<1%、相对误差<5%,结果准确度和精密度无显著差异。Multi N/C2100S分析仪可以高效、快速批量测定。5个月中4次监测6个实际水样总氮含量的结果为:白鱼泡水体中TN含量无显著变化;宾县1~#和3~#池塘水体含量逐月升高;5月稻田TN含量明显偏高,可能是水稻生长施肥所致;7月松花江水样TN含量高于其他月份,可能受养殖密度、模式、天气、投饵量、施肥量及周边农作物施药量的影响。 展开更多
关键词 总氮(TN) 紫外-可见分光光度计 multi N/C2100S分析仪 淡水养殖池塘 自然水域
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多氢酸解堵增注技术研究应用 被引量:7
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作者 卢红杰 龙波 +2 位作者 马云瑞 李雨龙 张书荣 《内蒙古石油化工》 CAS 2010年第23期71-74,共4页
油田解堵增注主要用酸液体系解除地层堵塞。常规酸液体系存在作用距离近、有效时间短、产生沉淀二次污染地层等问题,不能满足油田开发生产需要。多氢酸性能研究和解堵效果室内评价结果显示,该酸液体系具有缓速、深穿透、粘土溶蚀率低、... 油田解堵增注主要用酸液体系解除地层堵塞。常规酸液体系存在作用距离近、有效时间短、产生沉淀二次污染地层等问题,不能满足油田开发生产需要。多氢酸性能研究和解堵效果室内评价结果显示,该酸液体系具有缓速、深穿透、粘土溶蚀率低、水湿性、抑制沉淀等优点,可达到地层深部解堵的目的。现场应用结果表明,多氢酸解堵增注效果好,有效期长,是砂岩油藏基质酸化解堵较为理想的酸液体系。 展开更多
关键词 多氢酸 解堵 增注 酸化 酸液体系 溶蚀
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多氢酸酸化对商河油田深部解堵效果评价 被引量:1
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作者 申德勇 汪双喜 +1 位作者 付晶 孙英娜 《清洗世界》 CAS 2014年第11期21-24,共4页
介绍了多氢酸深部解堵技术在商河油田商三区的应用情况,该技术在商三区应用5口,有效率100%,有效期最长已超过17个月。
关键词 多氢酸 深部解堵 低渗
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DH油田1岩性段增注技术研究
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作者 肖晖 焦金生 曾俊 《重庆科技学院学报(自然科学版)》 CAS 2011年第4期29-33,共5页
DH油田1岩性段地层压力亏空大、注水压力高,急需采取有效的降压增注措施。针对1岩性段砂岩物性差、水平井段长的特点,在分析前期增注问题的基础上,开展了敏感性、润湿性、注水伤害模拟和酸化增注效果评价等室内实验,提出实现1岩性段增... DH油田1岩性段地层压力亏空大、注水压力高,急需采取有效的降压增注措施。针对1岩性段砂岩物性差、水平井段长的特点,在分析前期增注问题的基础上,开展了敏感性、润湿性、注水伤害模拟和酸化增注效果评价等室内实验,提出实现1岩性段增注的措施。对DH1-H15水平井进行多氢酸分流酸化改造,改造后注水情况表明,增注措施对DH油田1岩性段有较好的适用性。 展开更多
关键词 增注 水平井 分流酸化 多氢酸
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水力脉冲波协同多氢酸酸化解堵反应动力学模型 被引量:12
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作者 何延龙 蒲春生 +6 位作者 董巧玲 景成 谷潇雨 韩春春 纪超 刘洪志 李晓 《石油学报》 EI CAS CSCD 北大核心 2016年第4期499-507,共9页
水力脉冲波协同多氢酸酸化技术对于高压注水、注汽井近井区域的储层堵塞具有高效的解堵效果。但目前针对该项技术的模拟理论及动力学研究较少,现场工艺参数设计存在一定的盲目性。基于多氢酸活性酸组分的酸岩反应模型,以水力脉冲波传播... 水力脉冲波协同多氢酸酸化技术对于高压注水、注汽井近井区域的储层堵塞具有高效的解堵效果。但目前针对该项技术的模拟理论及动力学研究较少,现场工艺参数设计存在一定的盲目性。基于多氢酸活性酸组分的酸岩反应模型,以水力脉冲波传播动力学为基础,构建了水力脉冲波协同多氢酸酸化反应动力学模型;研究了孔隙度、渗透率、酸液及矿物浓度随时间和距离的变化规律,分析了水力脉冲波协同多氢酸酸化解堵的参数敏感性,并进行了矿场应用分析。研究表明:协同作用进一步提高了储层的酸化解堵效果,明显改善了酸液流速、酸液及矿物浓度的分布;振幅、频率较高时,酸液流速的径向差异直接影响相邻位置的解堵效果。针对不同类型的砂岩油藏设计了水力脉冲波协同多氢酸酸化解堵参数,并成功开展11井次矿场试验,注水压力平均下降6.3MPa,注汽压力平均下降3.5 MPa,起到了显著的解堵降压增注效果。 展开更多
关键词 水力脉冲波 多氢酸 解堵 动力学模型 酸岩反应
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Some Practical Issues Regarding Java Programming
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作者 Ming-fang Wang Department of Computer Science, University of Central ArkansasConway, Arkansas 72035 wangm @ panda.cs.uca.eduWu JieShanghai Institute of Computing Tech. Shanghai, China 200040 Telephone: 62520070 《计算机工程》 CAS CSCD 北大核心 1996年第S1期106-121,共16页
Java programming language is a major . new development which involves object-oriented programming and computer networking. Here, several examples of Java programs are presented. These examples show some major features... Java programming language is a major . new development which involves object-oriented programming and computer networking. Here, several examples of Java programs are presented. These examples show some major features that Java language provides, such as multi-thread, exception handling, network application writing, and the usage of Java applets. This article also shows some ways of setting up a Java language programming environment. All these examples are correct and ready to run. 展开更多
关键词 Java programming/object- ORIENTED programming/multi - THREAD
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ANALYSIS OF PSYCHOLOGIC HEALTH STATE AND INFLUENCING FACTORS IN COLLEGE AND SECONDARY SCHOOL STUDENTS IN SHAANXI PROVINCE
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作者 高成阁 王友平 +1 位作者 谭新 亢万虎 《Academic Journal of Xi'an Jiaotong University》 2000年第2期168-171,共5页
Objective The psychologic health level of college and secondaryschool students and the relevant factors were investigated to scientific basis and guidance for school mental health work.Methods Standard 1251 cases were... Objective The psychologic health level of college and secondaryschool students and the relevant factors were investigated to scientific basis and guidance for school mental health work.Methods Standard 1251 cases were drawn from 1‰ of students in colleges and middle schools of Shaanxi province.Taking 14 psychic health level indexes in SCL 90 as dependent variable and 109 indexes of psychic health back ground as in dependent variable, multi factor analyses have been made.Results 22.6% of students had relatively serious psychological problems.The score of SCL 90 in females was a little bit higher than that in males.The scores of students at both universities and senior middle schools were higher than that in junior middle schools students.The score of SCL 90 of students who came from the countryside was higher than that of city students.The score of the whole students was higher than that of the normal.The students with psychic problems showed obsession,interpersonal sensitivity,depression,anxiety,paranoia and hostility.Factor analysis showed that influencing factors included history of positive individual risking behavior,physical conditions,grade,address,family influences,menses and sexual prombles,bad relation with others,poor self assessment.Conclusion The psychologic health level of the students investigated is lower than that of the whole society.The factors,which hamper psychic health of students, are biological,psychological and social in nature. 展开更多
关键词 school psychologic health SCL -90 multi factor analysis influencing factors
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