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    • 75. 发明授权
    • Reservoir calibration parameterization method
    • 水库校准参数化方法
    • US09488047B2
    • 2016-11-08
    • US13437342
    • 2012-04-02
    • Yong ZhaoMartin Mlacnik
    • Yong ZhaoMartin Mlacnik
    • E21B49/00E21B43/00
    • E21B49/00
    • A method is described for producing an amended realization of a geostatistical model of a hydrocarbon reservoir using the Karhunen-Loève (KL) expansion. The KL expansion may be used to produce amended realizations for history matching and is widely used. However, it is necessary in order to use the KL expansion to perform singular value decomposition of the covariance matrix of the model to provide eigenvectors and eigen values for use in the expansion. In a typical geostatistical model, the covariance matrix is too large for singular value decomposition to be performed. Prior solutions to this problem involved reducing the resolution of the model so as to reduce the size of the covariance matrix. In the method described, a plurality of random realizations are generated and an approximation of the covariance matrix is constructed from the realizations, the approximation matrix having smaller dimensions than the true covariance matrix.
    • 描述了一种使用Karhunen-Loève(KL)扩建来生成油气藏地质统计模型的修正实现的方法。 KL扩展可用于产生历史匹配的修改实现,并被广泛使用。 然而,为了使用KL扩展来执行模型的协方差矩阵的奇异值分解以提供用于扩展的特征向量和特征值是必要的。 在典型的地统计模型中,协方差矩阵太大,无法进行奇异值分解。 此问题的先前解决方案涉及降低模型的分辨率,以减小协方差矩阵的大小。 在所描述的方法中,生成多个随机实现,并且从实现构造协方差矩阵的近似,该逼近矩阵具有比真实协方差矩阵小的维度。
    • 80. 发明授权
    • Clock-detecting circuit
    • 时钟检测电路
    • US08854031B2
    • 2014-10-07
    • US12726517
    • 2010-03-18
    • Yong Zhao
    • Yong Zhao
    • G06M1/10H02M1/08
    • H02M1/083
    • A clock-detecting circuit, containing at least a microprocessor, a clock circuit, and a zero-cross detecting circuit. The clock circuit is connected to the microprocessor. The input end of the zero-cross detecting circuit is connected to the utility power AC input. The output end of the zero-cross detecting circuit is connected to the input end of the microprocessor. The zero-cross detecting circuit operates to detect zero crossing points of the utility power AC input. The microprocessor operates to count the number of oscillation periods of the clock circuit in a time interval between two adjacent zero crossing points of the utility power AC input and to detect clock precision of the microprocessor according to the counted number. The circuit according to the invention features simple structure and low production cost, and is reliable and easy to be implemented.
    • 一个时钟检测电路,至少包含微处理器,时钟电路和零交叉检测电路。 时钟电路连接到微处理器。 零交叉检测电路的输入端连接到公用电源AC输入。 零交叉检测电路的输出端连接到微处理器的输入端。 零交叉检测电路用于检测公用电力AC输入的过零点。 微处理器用于对公用电力AC输入的两个相邻过零点之间的时间间隔中的时钟电路的振荡周期数进行计数,并根据计数来检测微处理器的时钟精度。 本发明电路结构简单,生产成本低,可靠,易于实现。