Pore structure of porous media, including pore size and topology, is rather complex. In immiscible twophase displacement process, the capillary force affected by pore size dominates the two-phase flow in the porous me...Pore structure of porous media, including pore size and topology, is rather complex. In immiscible twophase displacement process, the capillary force affected by pore size dominates the two-phase flow in the porous media, affecting displacement results. Direct observation of the flow patterns in the porous media is difficult, and therefore knowledge about the two-phase displacement flow is insufficient. In this paper, a two-dimensional(2D) pore structure was extracted from a sandstone sample, and the flow process that CO_2 displaces resident brine in the extracted pore structure was simulated using the Navier eStokes equation combined with the conservative level set method. The simulation results reveal that the pore throat is a crucial factor for determining CO_2 displacement process in the porous media. The two-phase meniscuses in each pore throat were in a self-adjusting process. In the displacement process,CO_2 preferentially broke through the maximum pore throat. Before breaking through the maximum pore throat, the pressure of CO_2 continually increased, and the curvature and position of two-phase interfaces in the other pore throats adjusted accordingly. Once the maximum pore throat was broken through by the CO_2, the capillary force in the other pore throats released accordingly; subsequently, the interfaces withdrew under the effect of capillary fore, preparing for breaking through the next pore throat.Therefore, the two-phase displacement in CO_2 injection is accompanied by the breaking through and adjusting of the two-phase interfaces.展开更多
In this paper Nottale’s acclaimed scale relativity theory is given a transfinite Occam’s razor leading to exact predictions of the missing dark energy [1,2] of the cosmos. It is found that 95.4915% of the energy in ...In this paper Nottale’s acclaimed scale relativity theory is given a transfinite Occam’s razor leading to exact predictions of the missing dark energy [1,2] of the cosmos. It is found that 95.4915% of the energy in the cosmos according to Einstein’s prediction must be dark energy or not there at all. This percentage is in almost complete agreement with actual measurements.展开更多
A new algorithm based on rough core was proposed to extract all relative-attribute reducts in decision information systems of large-scale records. In the algorithm, the rough core of the decision-making information sy...A new algorithm based on rough core was proposed to extract all relative-attribute reducts in decision information systems of large-scale records. In the algorithm, the rough core of the decision-making information system is first calculated. Then, an approach based on a top-down strategy is adopted to select the non-core condition attributes and generate candidate relative-attribute reducts. Finally, the set of all relative-attribute reducts is obtained by pruning the candidate relative-attribute reducts. Experimental results show that the proposed algorithm is superior to the other methods such as the algorithm without computing core, the exhaustive method and the discernibility matrix method in extracting all relative-attribute reducts for large-scale data sets.展开更多
An efficient active-set approach is presented for both nonnegative and general linear programming by adding varying numbers of constraints at each iteration. Computational experiments demonstrate that the proposed app...An efficient active-set approach is presented for both nonnegative and general linear programming by adding varying numbers of constraints at each iteration. Computational experiments demonstrate that the proposed approach is significantly faster than previous active-set and standard linear programming algorithms.展开更多
Purpose: The aim of this study was to understand patient-perceived empathy from nurse among different units of Taiwan acute care settings. Design: A crosssectional study was used with a questionnaire survey in acute c...Purpose: The aim of this study was to understand patient-perceived empathy from nurse among different units of Taiwan acute care settings. Design: A crosssectional study was used with a questionnaire survey in acute care units and intensive care units of a medical center in northern Taiwan. Participants were selected by convenient sampling. A total of 548 patients at 14 acute care units and 4 intensive care units in a large Medical Center participated in this questionnaire survey. Methods: Scale of patient-perceived empathy from nurse including 15 item Likert scale was used in this study. The statistical software SPSS 15.0 for Windows was applied and Cronbach’s α, factor analysis, Pearson’s correlation, t-test and one way ANOVA were conducted to analyze the data. Findings: Patients who were first-time hospitalization had higher scores of patient-perceived empathy from nurse than patients who have had hospitalizing experiences. The patient in surgical unit had the highest score of patient-perceived empathy from nurse. The empathy scale score of patient without ICU experience was significantly higher than patient with ICU experience. Also, patients without depressive history had higher score than patients with depression history. Conclusion: Patients with multiple admissions of hospitalization, ICU experience, and depressive history had lower score than other patients. It is suggested that the perception of patients with complicated disease or condition might be different. Thus, an in-depth caring knowledge of both emotions and disease was needed to support patients’ perception of empathy. Clinical Relevance: The care of complicated patients especially with ICU experience needs strong knowledge based both on emotion and disease.展开更多
基金funded by Key Laboratory of Coal-based CO_2 Capture and Geological Storage,Jiangsu Province,ChinaUS Advanced Coal Technology Consortium(No.2013 DFB60140-08)
文摘Pore structure of porous media, including pore size and topology, is rather complex. In immiscible twophase displacement process, the capillary force affected by pore size dominates the two-phase flow in the porous media, affecting displacement results. Direct observation of the flow patterns in the porous media is difficult, and therefore knowledge about the two-phase displacement flow is insufficient. In this paper, a two-dimensional(2D) pore structure was extracted from a sandstone sample, and the flow process that CO_2 displaces resident brine in the extracted pore structure was simulated using the Navier eStokes equation combined with the conservative level set method. The simulation results reveal that the pore throat is a crucial factor for determining CO_2 displacement process in the porous media. The two-phase meniscuses in each pore throat were in a self-adjusting process. In the displacement process,CO_2 preferentially broke through the maximum pore throat. Before breaking through the maximum pore throat, the pressure of CO_2 continually increased, and the curvature and position of two-phase interfaces in the other pore throats adjusted accordingly. Once the maximum pore throat was broken through by the CO_2, the capillary force in the other pore throats released accordingly; subsequently, the interfaces withdrew under the effect of capillary fore, preparing for breaking through the next pore throat.Therefore, the two-phase displacement in CO_2 injection is accompanied by the breaking through and adjusting of the two-phase interfaces.
文摘In this paper Nottale’s acclaimed scale relativity theory is given a transfinite Occam’s razor leading to exact predictions of the missing dark energy [1,2] of the cosmos. It is found that 95.4915% of the energy in the cosmos according to Einstein’s prediction must be dark energy or not there at all. This percentage is in almost complete agreement with actual measurements.
文摘A new algorithm based on rough core was proposed to extract all relative-attribute reducts in decision information systems of large-scale records. In the algorithm, the rough core of the decision-making information system is first calculated. Then, an approach based on a top-down strategy is adopted to select the non-core condition attributes and generate candidate relative-attribute reducts. Finally, the set of all relative-attribute reducts is obtained by pruning the candidate relative-attribute reducts. Experimental results show that the proposed algorithm is superior to the other methods such as the algorithm without computing core, the exhaustive method and the discernibility matrix method in extracting all relative-attribute reducts for large-scale data sets.
文摘An efficient active-set approach is presented for both nonnegative and general linear programming by adding varying numbers of constraints at each iteration. Computational experiments demonstrate that the proposed approach is significantly faster than previous active-set and standard linear programming algorithms.
文摘Purpose: The aim of this study was to understand patient-perceived empathy from nurse among different units of Taiwan acute care settings. Design: A crosssectional study was used with a questionnaire survey in acute care units and intensive care units of a medical center in northern Taiwan. Participants were selected by convenient sampling. A total of 548 patients at 14 acute care units and 4 intensive care units in a large Medical Center participated in this questionnaire survey. Methods: Scale of patient-perceived empathy from nurse including 15 item Likert scale was used in this study. The statistical software SPSS 15.0 for Windows was applied and Cronbach’s α, factor analysis, Pearson’s correlation, t-test and one way ANOVA were conducted to analyze the data. Findings: Patients who were first-time hospitalization had higher scores of patient-perceived empathy from nurse than patients who have had hospitalizing experiences. The patient in surgical unit had the highest score of patient-perceived empathy from nurse. The empathy scale score of patient without ICU experience was significantly higher than patient with ICU experience. Also, patients without depressive history had higher score than patients with depression history. Conclusion: Patients with multiple admissions of hospitalization, ICU experience, and depressive history had lower score than other patients. It is suggested that the perception of patients with complicated disease or condition might be different. Thus, an in-depth caring knowledge of both emotions and disease was needed to support patients’ perception of empathy. Clinical Relevance: The care of complicated patients especially with ICU experience needs strong knowledge based both on emotion and disease.
