Novel region-based image compression method based on spiking cortical model

To get the high compression ratio as well as the high-quality reconstructed image, an effective image compression scheme named irregular segmentation region coding based on spiking cortical model(ISRCS) is presented. This scheme is region-based and mainly focuses on two issues. Firstly, an appropriate segmentation algorithm is developed to partition an image into some irregular regions and tidy contours, where the crucial regions corresponding to objects are retained and a lot of tiny parts are eliminated. The irregular regions and contours are coded using different methods respectively in the next step. The other issue is the coding method of contours where an efficient and novel chain code is employed. This scheme tries to find a compromise between the quality of reconstructed images and the compression ratio. Some principles and experiments are conducted and the results show its higher performance compared with other compression technologies, in terms of higher quality of reconstructed images, higher compression ratio and less time consuming.     

井下工具系统固液耦合动力特性研究

用有限元法推导了普通井下生产管柱的固液耦合振动方程,计算出管柱的固有频率,并与数值计算方法进行对比.对井下管柱系统进行有限元谐响应分析,根据实测的潜油电泵振动数据,结合谐响应激励载荷,进行动力学分析,计算出管柱稳定工作时的动载荷频率范围.结果表明,额定功率下潜油泵的振动以及原油的流动速度均不会对井下工具系统产生明显的振动影响.     

浅议知识经济与企业发展

论述了知识经济的特点及发展趋势，指出在经济全球化及我国加入WTO后，只有提高企业知识含量，提高劳动者素质，大力推进企业技术创新，企业才能在竞争中稳操胜券。     

丝锥耐用度计算经验公式

介绍了用数学回归分析法推导出丝锥耐用度计算经验公式，并通过数学回归分析法中的相关系数对此公式进行检验，其检验与计算结果相符。     

强化质量管理激发企业活力

从贯彻ISO9000族系列标准、加大人才培养力度、加大科技投入、建立完善的服务体系4个方面讨论了强化质量管理、激发企业活力的途径与方法。     

加强技术改造工程管理提高企业经济效益

从建立健全内部管理制度，严格执行国家有关政策法规，严格项目前期管理，以质量为本，突出“质量、工期、投资”3大控制，重视后评价管理，促进投改管理工作上台阶等方面进行了论述，指出中国铝业公司山西分公司成绩的取得与领导层挖潜降耗，不断加大技改力度，重视科技创新是分不开的。     

亚硝酸根的催化动力学光度法测定

在酸性介质中,NO-2对KBrO3氧化甲基红反应有强烈的催化作用,研究了反应的动力学条件,建立了测定痕量NO-2的新方法,方法的测定范围为0.32～4.8μg/L,检出限为5.4×10-11g/L.该方法简便、灵敏,选择性好,用于水样中NO-2的测定,结果满意.     

羊三木油田低阻油层测井评价方法

针对羊三木油田低阻油层.综合地质、钻井特征,对低阻油层成因进行了分析,认为该区低阻油层主要是由于薄层、高束缚水饱和度储层引起.针对羊三木油田的实际情况.提出了区域构造对比法、自然电位减少系数法等低阻油层定性评价方法和针对高束缚水饱和度的双水法、针对薄层处理的高分辨率处理技术等定量评价方法.     

Phase Contrast Micro-Computed Tomography of Biological Sample at SSRF

In line X-ray phase contrast micro-computed tomography(IL-XPCT),which can be implemented at third generation synchrotron radiation sources or by using a micro-focus X-ray tube,is a powerful technique for non-destructive,high-resolution investigations of a broad variety of materials.At the Shanghai Synchrotron Radiation Facility(SSRF),the X-ray Imaging and Biomedical Applications Beamline was built and started regular user operation in May 2009.Both qualitative(without phase retrieval) and quantitative(with ...