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26 results on '"Qin, Shuren"'

3. STUDY OF DIESEL FUEL STABILITY ON OXYGEN ABSORPTION. II. EFFECT OF TEMPERATURE AND OXYGEN PRESSURE

Author

Qi Yutai, Li Huipeng, and Qin Shuren

Subjects
Chemical substance, Chemistry, General Chemical Engineering, Analytical chemistry, Oxygene, Energy Engineering and Power Technology, Mineralogy, chemistry.chemical_element, General Chemistry, Geotechnical Engineering and Engineering Geology, Oxygen, law.invention, Catalysis, Diesel fuel, Fuel Technology, Magazine, law, Absorption (electromagnetic radiation), Oxygen pressure, computer, computer.programming_language
Abstract

The effect of temperature and oxygen pressure on oxygen absorption properties of Daqing straight run diesel fuel (SRDF) and Daqing hydrogenated coking diesel fuel (HCDF) was investigated at 293 ∼ 353 K under 0.11 ∼ 0.25MPa(O2) and Cu catalysis in darkness based on the study of diesel fuel stability on oxygen absorption. The experimental results show that the oxygen absorption quantities (OAQs) of diesel fuels increase rapidly with the increasing of temperature or oxygen pressure at given time and oxygen pressure or temperature during the oxygen absorption. The higher the oxygen pressure or the temperature and the longer the time, the greater the OAQ of diesel fuel. The OAQs of diesel fuels change a little at shorter times, while they vary greatly at longer times. Low temperature has a great effect on OAQ of SRDF and high temperature affects clearly OAQ of HCDF. Oxygen pressure gives a evident action on OAQ of SRDF, but it affects a little OAQ of HCDF. At low temperature or high oxygen pressure the OAQ of ...

Published
2001

4. INFLUENCE OF PARAFFIN CONTENT ON LOW TEMPERATURE PERFORMANCES OF DIESEL FUEL AND LUBE BASE OIL

Author

Li Huipeng, Qin Shuren, and Qi Yutai

Subjects
Diesel fuel, Fuel Technology, Chromatography, Chemistry, General Chemical Engineering, Sample (material), Content (measure theory), Analytical chemistry, Base oil, Empirical formula, Energy Engineering and Power Technology, General Chemistry, Geotechnical Engineering and Engineering Geology
Abstract

The influence of dewaxing ratio, added solid and liquid paraffins on the low temperature performances of Daqing hydrogenated diesel fuel and hydrogenated lube base oil was studied in detail. The experimental results show that the solidification points of samples fall rapidly with the increasing of dewaxing ratio or rise quickly with the adding of solid and liquid paraffins. The quantitative relations between the solidification points of tested samples and the dewaxing ratio or the contents of added solid and liquid paraffins could be exactly expressed by the experiential formula presented in the paper. The sample solidification points predicted by the empirical formula are well identical with ones determined in the test and the error is generally less than 2°C.

Published
2001

5. STUDY OF DIESEL FUEL STABILITY ON OXYGEN ABSORPTION. III. CHANGES OF RATES AND ACCELERATIONS OF OXYGEN ABSORPTION

Author

Qi Yutai, Qin Shuren, and Li Huipeng

Subjects
Chemistry, General Chemical Engineering, Kinetics, Analytical chemistry, Energy Engineering and Power Technology, Mineralogy, General Chemistry, Geotechnical Engineering and Engineering Geology, Lower temperature, Catalysis, Diesel fuel, Fuel Technology, Oxygen absorption, Oxygen pressure
Abstract

The changes of oxygen absorption rates (OARs) and oxygen absorption accelerations (OAAs) for Daqing straight run diesel fuel (SRDF) and hydrogenated coking diesel fuel (HCDF) have been theoretically studied at 290 ∼ 360 K under 0.10 ∼ 0.25 MPa(O2) and Cu catalysis in darkness based on the investigation of kinetics of oxygen absorption for diesel fuels. The theoretical results show that OARs and OAAs of two diesel fuels decrease rapidly with the increasing of time, while they increase clearly with the rising of oxygen pressure or temperature at given test conditions during oxygen absorption. The higher the temperature and oxygen pressure or the longer the time, the greater the changes of diesel fuel OARs and OAAs. The OARs and OAAs change more clearly at shorter time ( 0.15 MPa) or higher temperature (>330 K), while they vary a little at longer times or lower O2 pressure or lower temperature. The (initial) OAR and (initial) OAA of HCDF are much greater than that of SRDF. T...

Published
2001

25. [Electrocardiographic signal feature extraction and its instrument development based on continuous wavelet transform].

Author

Ji Z, Qin S, and Peng C

Subjects
Humans, Models, Biological, Algorithms, Computer Simulation, Electrocardiography, Signal Processing, Computer-Assisted
Abstract

This paper introduces a virtual recording and analysis instrumentation system for recording and identifying electrocardiographic (ECG) signals. The system developed is aimed at constructing a PC-based virtual instrumentation which enables to record. investigate and measure the ECG signal of 12 leads simultaneously and perfectly in order to improve the measuring precision of ECG. Based on the proper feature in time domain of Mexican hat wavelet expressed by positioning and analysis precision for QRS complex, the instrumentation system uses continuous wavelet transform(CWT) and uses the Mexican hat as the wavelet base to measure precisely the characteristic information and generate the precise characteristic parameters of ECG. The analysis of measured ECG signals in hospital demonstrated that even in the condition with serious noise interference, the method presented is still easily to describe the characteristics of ECG on line precisely which makes the instrumentation system valuable in practical application.

Published
2006

26. [A new approach to wavelet-based P-wave detection].

Author

Wan X, Qin S, Liang X, and Ding J

Subjects
Humans, Sensitivity and Specificity, Algorithms, Electrocardiography, Signal Processing, Computer-Assisted
Abstract

According to the characteristics of four basic P morphologies, combining the wavelet transform and the amplitude and slope of transformed P wave, a new P-wave detecting method based on "wavelet-amplitude-slope" algorithm is presented: First search out all modulus maximum pairs to satisfy the threshold after wavelet transform, and then applying the amplitude and slope criterion exclude the interferes and detect the P peak and its shape, last determine the onset and end of P wave respectively which should be separately calculated for single-peak and double-peak P wave (or biphasic P wave). The approach is applied in experiments of data from MIT/BIH database and randomly collected data of clinical ECG. The experimental statistical results shows that the correct detecting rate is as high as 96% compared to manual annotation.

Published
2006

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