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1.
Artículo en Chino | WPRIM (Pacífico Occidental) | ID: wpr-456420

RESUMEN

In recent years, many modern spectral databases for complex materials ( such as soil, feed, forensic evidence materials, pharmaceuticals and oils) have been established based on molecular spectroscopy (UV, infrared, near infrared, Raman and fluorescence) both at home and abroad, which are playing more and more important roles in the agricultural and industrial production and science research. Spectral searching method is one of the key technologies to make full use of the molecular spectral database. This paper reviewed the progress in the basic and modified algorithm, strategy and application of molecular spectral searching methods, and put forward the scientific and technological problems that need attention and further research.

2.
Artículo en Chino | WPRIM (Pacífico Occidental) | ID: wpr-456491

RESUMEN

To solve the calibration transmission problem in near-infrared ( NIR) spectroscopy, a novel model transfer method, Simple Linear Regression Direct Standard-ization ( SLRDS ) , has been presented. To investigate the validity of the proposed method, a real corn sample NIR dataset was tested and the direct standardization ( DS ) method and piecewise direct standardization ( PDS ) method were involved as a comparison. Our results indicated that SLRDS can correct compressed NIR data differences among instruments and enable the user to share corn sample PLS calibration model among three instruments, at the same time it has higher prediction accuracy, fewer parameters and simpler model than DS and PDS.

3.
China Modern Doctor ; (36): 123-125, 2014.
Artículo en Chino | WPRIM (Pacífico Occidental) | ID: wpr-1036848

RESUMEN

Objective To explore the basic reason of postpartum hemorrhage patients, and compare the differences of postpartum hemorrhage in the different delivery modes, in order to serve the clinical treatment. Methods The delivery modes in gynecological patients in our hospital were input to statistical analysis,the postpartum hemorrhage in cesare-an section and vaginal delivery were comparative study, the difference in bleeding frequency, hemorrhage cause,blood loss of two groups were compared. Results The blood loss of caesarean section was significantly higher than that of vaginal delivery (P<0.05). The difference of bleeding time in two delivery modes was not significant (P>0.05).The main reason for vaginal delivery of postpartum hemorrhage was uterine inertia,while the main reason for hemorrhage of cesarean section was operation factors or position. Conclusion Clinical analysis of postpartum hemorrhage in cesarean section and vaginal delivery situation and the reason of difference is helpful to the prevention and the control of mater-nal postpartum hemorrhage.

4.
Artículo en Chino | WPRIM (Pacífico Occidental) | ID: wpr-410545

RESUMEN

Genetic algorithms (GA), a global searching method, is applied to select wavelength variables of near infrared spectroscpy (NIR) for multivariate calibration made by partial least squares (PLS) method. Two application examples of NIR analysis show that this wavelength selection method for PLS modeling not only simplifies and optimizes calibration model but also increases the prediction ability of calibration model. The method is especially adequate for the system where only PLS is difficult to correlate.

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