The sea-ice concentration in the Northern Hemisphere, 500 hPa height, sea-level pressure and 1000-500 hPa thickness of monthly mean data are examined for the period 1953-1989, with emphasis on the winter season.Relati...The sea-ice concentration in the Northern Hemisphere, 500 hPa height, sea-level pressure and 1000-500 hPa thickness of monthly mean data are examined for the period 1953-1989, with emphasis on the winter season.Relationships between large-scale patterns of atmospheric variability and sea-ice variability are investigated, making use of the correlation method. The analysis is conducted for the Atlantic sectors. In agreement with earlier studies based upon monthly mean data on sea-ice concentration, the strongest sea-ice pattern is composed of a dipole with opposing centers of action in the Davis Straits / Labrador Sea region and the Greenland and Barents Seas. Its temporal variability is strongly coupled to the atmospheric North Atlantic Oscillation (NAO). The relationship between the two patterns is strongest with the atmosphere leading the ocean. The polarity of the NAO is associated with Greenland blocking episodes, during which the influence of the atmosphere is strong enough to temporarily halt the climatological mean advance of the ice edge in some regions and substantially accelerate it in others.The relationships between the fields are indicative of local forcing of sea-ice in most regions, with wind stress and thermodynamic fluxes at the air-sea interface both contributing.展开更多
I. INTRODUCTIONLike all the vector fields, the earth’s magnetic field is described by three independent elements, which are different for different coordinate systems. The geomagnetic field is commonly represented by...I. INTRODUCTIONLike all the vector fields, the earth’s magnetic field is described by three independent elements, which are different for different coordinate systems. The geomagnetic field is commonly represented by total field intensity H, declination D and inclination I in spherical polar coordinates. Much attention has been paid to the determinations of paleofield direction展开更多
In this paper, an index for evaluating Distance of a healthy heart from Sino-Atrial Blocking Arrhythmia (SABA) is presented. After definition of the main pacemakers' model of heart, Sino-Atrial (SA) and Atrio-Vent...In this paper, an index for evaluating Distance of a healthy heart from Sino-Atrial Blocking Arrhythmia (SABA) is presented. After definition of the main pacemakers' model of heart, Sino-Atrial (SA) and Atrio-Ventricular nodes (AV), the boundary of synchronization, which demonstrates the boundary of blocking arrhythmia, is obtained using perturbation method. In order to estimate of healthy heart characteristics, a parameter estimator is introduced. The distance from SABA is calculated using Lagrange method and Kohn-Tucker conditions. In addition, the maximum admissible decrease in the coupling intensity and the maximum admissible increase in the discrepancy between the natural frequencies of two pacemakers are determined in order to maintain the synchronization between the two pacemakers.展开更多
针对遥控器缺陷检测中待测样品图像可能出现的平移、旋转变化造成误检率过高的问题,提出了一种基于SURF(Speeded Up Robust Feature)算法的遥控器缺陷自动检测方法。上述方法首先利用SURF提取特征点,其次采用分块匹配对原匹配算法进行改...针对遥控器缺陷检测中待测样品图像可能出现的平移、旋转变化造成误检率过高的问题,提出了一种基于SURF(Speeded Up Robust Feature)算法的遥控器缺陷自动检测方法。上述方法首先利用SURF提取特征点,其次采用分块匹配对原匹配算法进行改进,实现特征点的加速匹配并消除误匹配点,根据匹配得到的单应性矩阵求得校正后的图像,得到校正图与模板图的差分图。对差分图进行二值化和形态学处理,标注缺陷位置。实验结果表明,所提出的算法能有效检测出遥控器中的缺陷,并对旋转、平移等具有较好的鲁棒性。实验平均检测时间为0.82s,达到了实时性的要求,具有一定的应用价值。展开更多
文摘The sea-ice concentration in the Northern Hemisphere, 500 hPa height, sea-level pressure and 1000-500 hPa thickness of monthly mean data are examined for the period 1953-1989, with emphasis on the winter season.Relationships between large-scale patterns of atmospheric variability and sea-ice variability are investigated, making use of the correlation method. The analysis is conducted for the Atlantic sectors. In agreement with earlier studies based upon monthly mean data on sea-ice concentration, the strongest sea-ice pattern is composed of a dipole with opposing centers of action in the Davis Straits / Labrador Sea region and the Greenland and Barents Seas. Its temporal variability is strongly coupled to the atmospheric North Atlantic Oscillation (NAO). The relationship between the two patterns is strongest with the atmosphere leading the ocean. The polarity of the NAO is associated with Greenland blocking episodes, during which the influence of the atmosphere is strong enough to temporarily halt the climatological mean advance of the ice edge in some regions and substantially accelerate it in others.The relationships between the fields are indicative of local forcing of sea-ice in most regions, with wind stress and thermodynamic fluxes at the air-sea interface both contributing.
文摘I. INTRODUCTIONLike all the vector fields, the earth’s magnetic field is described by three independent elements, which are different for different coordinate systems. The geomagnetic field is commonly represented by total field intensity H, declination D and inclination I in spherical polar coordinates. Much attention has been paid to the determinations of paleofield direction
文摘In this paper, an index for evaluating Distance of a healthy heart from Sino-Atrial Blocking Arrhythmia (SABA) is presented. After definition of the main pacemakers' model of heart, Sino-Atrial (SA) and Atrio-Ventricular nodes (AV), the boundary of synchronization, which demonstrates the boundary of blocking arrhythmia, is obtained using perturbation method. In order to estimate of healthy heart characteristics, a parameter estimator is introduced. The distance from SABA is calculated using Lagrange method and Kohn-Tucker conditions. In addition, the maximum admissible decrease in the coupling intensity and the maximum admissible increase in the discrepancy between the natural frequencies of two pacemakers are determined in order to maintain the synchronization between the two pacemakers.
文摘针对遥控器缺陷检测中待测样品图像可能出现的平移、旋转变化造成误检率过高的问题,提出了一种基于SURF(Speeded Up Robust Feature)算法的遥控器缺陷自动检测方法。上述方法首先利用SURF提取特征点,其次采用分块匹配对原匹配算法进行改进,实现特征点的加速匹配并消除误匹配点,根据匹配得到的单应性矩阵求得校正后的图像,得到校正图与模板图的差分图。对差分图进行二值化和形态学处理,标注缺陷位置。实验结果表明,所提出的算法能有效检测出遥控器中的缺陷,并对旋转、平移等具有较好的鲁棒性。实验平均检测时间为0.82s,达到了实时性的要求,具有一定的应用价值。
