Papers by Keyword: Separate

Abstract: A carbaryl molecularly imprinted capillary monolith was prepared by organic-inorganic hybrid approach. Methacrylic acid (MAA) as functional monomer, γ-methacryloxypropytrimethoxysilane (γ-MAPS) as crosslinker, carbaryl as template molecule, and acetonitrile/dichloromethane mixture (v/v, 1:4) were used as porogen. The molar ratio of 1:6:8 (carbaryl:MAA: γ-MAPS, for which the retention factor k was 7.57, was expected to be highest for carbaryl on the optimum capillary monolith. The condition of 20 mmol/L phosphate buffer with pH value 3.5 containing 30% acetonitrile favored the carbaryl separation from three carbamates (carbaryl, fenobucarb and metocarb) through the effective imprinted length of the column which was 15 cm. As far as the screening of carbaryl from a group of structural analogs, the MIP monolith combined with capillary electrochromatography was preferred.

Abstract: The aim of this study was to investigate the surface composition and morphology of fast-growing Alkaline peroxide mechanical pulping (APMP). Surface ultrastructure of APMP were modified by cellulase. The fiber ultrastructure and cellulose crystallinity before and after treatment with cellulose enzyme were analyzed by Atomic force microscopy (AFM). The results showed that surface particle size can be reduced to 300nm and bump of fiber surface became obvious. According to the phase contrast image and topography, cell wall region separate clearly. The specific surface area of single fiber became bigger.

Abstract: In the marine study field, it always analysis the kinds of acquisition signals to extract the meaningful data. In this paper, a method of wavelet packet transformation (WPT) is suggested to the analytical ocean signals, such as the tidal level in the event of typhoon. It's known that the tidal level contains different frequency of astronomical tidal components and storm surge components, so it can be decomposed by using WPT to separate them into serials of frequency bands signals. Specifically, the storm surge process curve can be extracted independently by reconstructing the exclusive decomposed wavelet packet coefficients for our deeply research in the future. Taking one of typhoon measured tidal levelas an example to validation the opinion, the storm surge is calculated by using the presented method.Compared with the value calculated by traditional linear method, it shows that the suggested method can preferably separate storm surge and also has applied significance in analysising the ocean signals.

Abstract: This paper introduces the current technology of separating and refining β-methylnaphthalene from wash oil. On this basis, I propose a new production method of β-methylnaphthalene after many experiments. Industrial methylnaphthalene is washed twice with sulfuric acid and is distilled once. The content of β-methylnaphthalene is higher than 96%.The yield is 60%, which is higher than current domestic production levels.

Abstract: Two key products were isolated and purified from liquid mixture composition of wheat straw, by means of a combination of organic solvent extraction and column chromatography. Their structures were identified on basis of nuclear magnetic resonance (1H-NMR, 13C-NMR, DEPT), mass spectrometry (MS), and infrared (IR). The mechanism of liquefaction of straw was inferred from the structures of products and changes of hydroxyl value and liquefaction residue, which make up the lack of mechanistic studies of overall utilization of plant fibers.

Abstract: Time synchronization system has been widely used in power system. According to the needs of different system, it provides different signals. Usually you can use a GPS clock pulse, serial message, IRIG-B yards and so on. B code contains both plus and serial time message .And the traditional equipment is often used pulse and serial message at the same time. We put forward a method to transmit pulse information and serial message information on a transmission line .And at receiving place, it can restore the signals. It can reduce line costs and outside interferences, is beneficial to the optimization of system.