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383 results about "Single variable" patented technology

A single variable equation is comprised of two parts: the (lone) variable and the equation. So let’s look at what those are and how to put them together. A variable is a symbolic placeholder for a number we do not yet know. Often, you’ll see x or y used as a variable in math problems,...

Method for on-line measurement of coal quality characteristics based on partial least squares method

The invention provides a method for on-line measurement of coal quality characteristics based on partial least squares method. Firstly, the coal calibration samples containing known components are detected by use of an laser-induced breakdown spectroscopy (LIBS) system, the calibration samples are classified by the principal component analysis (PCA) or partial least squares-discriminant analysis (PLS-DA) method according to the obtained spectral line intensity matrix, and PLS regression equations of the individual classes of the calibration samples are established respectively; and then a sample to be tested is detected on line to obtain an LIBS spectrum, the type of the sample to be tested is judged by the PCA or PLS-DA method, and the spectral line intensity matrix of the LIBS spectrum is put into the PLS regression equation of the corresponding type to calculate the mass concentrations of individual elements in the sample to be tested. The method fully utilizes the effective information of the LIBS spectrum, eliminates the multiple correlation of spectral line intensity caused by the mutual interference of the elements, reduces the influence of the matrix effect, and is characterized by high goodness of fit, strong reproducibility and high prediction accuracy in comparison with the single-variable calibration method in the prior art.
Owner:TSINGHUA UNIV

Cigarette quality evaluation method and system based on principal component analysis

The invention discloses a cigarette quality evaluation method and system based on principal component analysis. The cigarette quality evaluation method and system solves the problem that an existing single-variable evaluation method cannot carry out procedure quality evaluation on multiple-variable procedures. The cigarette quality evaluation method and system uses a principal component analysis method to evaluate processing quality of the multiple-variable procedures and can provide basis for comprehensively grasping procedure quality processing states and procedure quality improvement. The method comprises the steps of firstly, calculating process capability indexes of all processing parameters, then using the principal component analyzing method to analyze all processing parameter data, confirming the number of principal components according to the principle that the accumulative total contribution rate is larger than or equal to 90%, confirming weights of all components according to the explanation variances of all principal components, and finally using an arithmetic weighting method to obtain procedure comprehensive process capability indexes. The cigarette quality evaluation method and system can provide more comprehensive and objective results and provides an effectively tool for an enterprise to know procedure total processing quality situations.
Owner:陈景正
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