The Chang-63 reservoir in the Huaqing area has widely developed tight sandstone ＂thick sand layers, but not reservoirs characterized by rich in oil＂, and it is thus necessary to further study its oil and gas enrichm...The Chang-63 reservoir in the Huaqing area has widely developed tight sandstone ＂thick sand layers, but not reservoirs characterized by rich in oil＂, and it is thus necessary to further study its oil and gas enrichment law. This study builds porosity and fracture development and evolution models in different deposition environments, through core observation, casting thin section, SEM, porosity and permeability analysis, burial history analysis, and ＂four-property-relationships＂ analysis.展开更多
Shandong Province, with a population of 84 million and located in the east coastline of China, is rich in natural resources and ranks middle in economic develpment of the whole nation. Around 90000 people are dead of ...Shandong Province, with a population of 84 million and located in the east coastline of China, is rich in natural resources and ranks middle in economic develpment of the whole nation. Around 90000 people are dead of cancer each year. In the recent twenty years, trends in malignant neoplasm展开更多
The success of the prediction of Haicheng earthquake and the failure of the prediction of Tangshan earthquake were both well known in the world. What happened, why such a strong earthquake as occurred in Haicheng had ...The success of the prediction of Haicheng earthquake and the failure of the prediction of Tangshan earthquake were both well known in the world. What happened, why such a strong earthquake as occurred in Haicheng had been predicted successfully and with a small loss of lives and property? Why a successively strong earthquake about a year later in a region not so further was failure in the imminent stage of prediction and there were so many fatalities and a great degree of property? The author addresses these points based on these true experiences including the first hand experiences leading up to, during, and following these two earthquarter. In addition, he also introduced some seimic phenomena which he had seen after Chi-chi earthquake in Taiwan.展开更多
Objective To compare the validation of the Sino System for Coronary Operative Risk Evaluation (SinoSCORE) with the European system for cardiac operative risk evaluation (EuroSCORE) in patients undergoing off-pump coro...Objective To compare the validation of the Sino System for Coronary Operative Risk Evaluation (SinoSCORE) with the European system for cardiac operative risk evaluation (EuroSCORE) in patients undergoing off-pump coronary artery bypass (OPCAB) surgery in China. Methods Data of patients who underwent OPCAB between 2004 and 2005 in展开更多
Wennerstrom and Puterbaugh （1984） presented a model for predicting the shock loss in a compressor blade row that took into account the three-dimemionality of the shock surface. Both the measured data and the numeric...Wennerstrom and Puterbaugh （1984） presented a model for predicting the shock loss in a compressor blade row that took into account the three-dimemionality of the shock surface. Both the measured data and the numerical solution show that the shock surface is almost normal to the relative flow on each S<sub>1</sub> stream surface near the design flow condition. The shock surface is oblique in the spanwise direction because of the sweep of展开更多
The prediction of the peak width at half height is an important aspect in the optimization of the chromatographic operating conditions.In this paper,a linear relationship,between the peak widths at half height and the...The prediction of the peak width at half height is an important aspect in the optimization of the chromatographic operating conditions.In this paper,a linear relationship,between the peak widths at half height and the retention values with various isocratic elution is observed.In gradient elution,however,the relationship between the peak widths at half height and the so-called invented retention values that correspond to the mobile phase composition by eluting the solute from the column end is developed.We believe that there is almost the same band width at half height inside the column (in unit of length)for different solutes.The peak width at half height in the chromatogram(in unit of time)is mainly determined by the capacity factor of the solute when it is eluted front the column end.The larger the capacity factor of a solute eluted from the column end,the more slowly will be the solute eluted from the column end and the wider will be the peak width at half height.It is possible to predict the peak width at half height in various isocratic and gradient elutions by using this linear relationship.展开更多
文摘The Chang-63 reservoir in the Huaqing area has widely developed tight sandstone ＂thick sand layers, but not reservoirs characterized by rich in oil＂, and it is thus necessary to further study its oil and gas enrichment law. This study builds porosity and fracture development and evolution models in different deposition environments, through core observation, casting thin section, SEM, porosity and permeability analysis, burial history analysis, and ＂four-property-relationships＂ analysis.
文摘Shandong Province, with a population of 84 million and located in the east coastline of China, is rich in natural resources and ranks middle in economic develpment of the whole nation. Around 90000 people are dead of cancer each year. In the recent twenty years, trends in malignant neoplasm
文摘The success of the prediction of Haicheng earthquake and the failure of the prediction of Tangshan earthquake were both well known in the world. What happened, why such a strong earthquake as occurred in Haicheng had been predicted successfully and with a small loss of lives and property? Why a successively strong earthquake about a year later in a region not so further was failure in the imminent stage of prediction and there were so many fatalities and a great degree of property? The author addresses these points based on these true experiences including the first hand experiences leading up to, during, and following these two earthquarter. In addition, he also introduced some seimic phenomena which he had seen after Chi-chi earthquake in Taiwan.
文摘Objective To compare the validation of the Sino System for Coronary Operative Risk Evaluation (SinoSCORE) with the European system for cardiac operative risk evaluation (EuroSCORE) in patients undergoing off-pump coronary artery bypass (OPCAB) surgery in China. Methods Data of patients who underwent OPCAB between 2004 and 2005 in
文摘Wennerstrom and Puterbaugh （1984） presented a model for predicting the shock loss in a compressor blade row that took into account the three-dimemionality of the shock surface. Both the measured data and the numerical solution show that the shock surface is almost normal to the relative flow on each S<sub>1</sub> stream surface near the design flow condition. The shock surface is oblique in the spanwise direction because of the sweep of
基金This work was supported by the Foundation of Chinese Academy of Sciences.
文摘The prediction of the peak width at half height is an important aspect in the optimization of the chromatographic operating conditions.In this paper,a linear relationship,between the peak widths at half height and the retention values with various isocratic elution is observed.In gradient elution,however,the relationship between the peak widths at half height and the so-called invented retention values that correspond to the mobile phase composition by eluting the solute from the column end is developed.We believe that there is almost the same band width at half height inside the column (in unit of length)for different solutes.The peak width at half height in the chromatogram(in unit of time)is mainly determined by the capacity factor of the solute when it is eluted front the column end.The larger the capacity factor of a solute eluted from the column end,the more slowly will be the solute eluted from the column end and the wider will be the peak width at half height.It is possible to predict the peak width at half height in various isocratic and gradient elutions by using this linear relationship.
