In gas well testing process,borehole fluid flow distribution is inconsistent under different work... more In gas well testing process,borehole fluid flow distribution is inconsistent under different work regimes.In wellhead shut-in pressure survey,the pressure gauge distance from middle part of a reservoir,phase state differentiation and gravity differentiation have some impact on shut-in pressure data.Based on bottom hole pressure changes recorded in process of a gas well testing,this paper analyzes such fluid flow variation and the causes of little pressure drop after shut-in.it is shown that the process of bottom hole liquid loading at early shut-in and liquid submerging the pressure gauge appears slope line that measured points deviate from theoretical points in the double logarithmic early diagnosis diagram.The results are of a certain significance for pressure data analysis and processing.
In order to predict accurately the characteristics of supersonic flow in new type externally pres... more In order to predict accurately the characteristics of supersonic flow in new type externally pressurized spherical air bearings under large bearing clearance and high air supply pressure, which could decrease their load carrying capacity and stability, a CFDbased analysis was introduced to solve the threedimensional turbulent complete compressible air flow governing equations. The realizable κ−ε model was used as a turbulent closure. The supersonic flow field near air inlets was analyzed. The flow structures illustrate that the interaction exists between shock waves and boundary layer, and the flow separation is formed at the lower corner and the lower wall around the point of a maximum velocity. The numerical results show that the conversion from supersonic flow to subsonic flow in spherical air bearing occurs through a shock region (pseudoshock), and the viscous boundary layer results in the flow separation and reverse flow near the shock. The calculation results basically agree with the corresponding experimental data.
In the present study, a series of tests were conducted on aluminum alloy 2024 to investigate the ... more In the present study, a series of tests were conducted on aluminum alloy 2024 to investigate the effect of detail design on the fatigue behavior of fastener holes in specimens. Two types of detail designs were concerned. One was the mode of fastener holes (countersunk rivet or countersunk bolt), the other was drilling process (traditional air-drilling process or one step compound cutting process). The fracture surfaces were observed by means of an optical microscope. Finite element method (FEM) was employed to analyze the distribution of stress around the fastener holes. The results showed that crack always initiated at the hole edge where the stress concentration occurred. Crack initiation was induced by stress concentration. Crack initiation life accounted for 80% of total fatigue life of fastener holes. The fatigue life of fastener hole using countersunk rivet was longer than that using countersunk bolt. Contrasted to traditional air-drilling process, the fatigue life of fastener hole could be improved by 44-55% using one step compound cutting process. However, the dispersibility of fatigue life became increasingly severe when fatigue life was prolonged.
2013 International Conference on Management Science and Engineering 20th Annual Conference Proceedings, 2013
The purpose of this paper is to explore the influence ways of eXtensible Business Reporting Langu... more The purpose of this paper is to explore the influence ways of eXtensible Business Reporting Language (XBRL) for the accounting information quality. The research finds three accounting information quality standards. They are respectively: general quality standards, conversion quality standards and enhance quality standards. According to the three standards, the research put forward three influence ways and some concrete countermeasures. First, improving the relevance, objectivity, comparability and intelligibility could improve the general quality of accounting information. Second, improving the conversion authenticity, technical compliance and security could improve the conversion quality of accounting information. Third, improving the personality relevance, data efficiency and wide application could improve the enhance quality of accounting information. General accounting information quality is the foundation, conversion accounting information quality is the guarantee and enhance accounting information quality must further enhance the efficiency of the accounting information and capital allocation efficiency.
2011 International Conference on Management Science & Engineering 18th Annual Conference Proceedings, 2011
With the nor-normal distribution and nor-binomial utility function of investors, higher-order mom... more With the nor-normal distribution and nor-binomial utility function of investors, higher-order moments should be taken into consideration with portfolio selection. So far, studies on portfolio selection with higher-order moments are mainly conducted under the framework of mean-variance-skewness while kurtosis is seldom taken into account. But many literatures have pointed out kurtosis play more important role in portfolio selection than variance and skewness. So, in order to fill up the study gap, portfolio selection with higher-order moments will be studied, under the framework of mean-variance-skewness-kurtosis, in this paper. Firstly, the optimization model of portfolio selection with kurtosis minimization is set up. Then, semidefinite programming relaxation is suggested based on research results of Lasserre and Waki to resolve the difficulty of model solution from the higher order and non-convexity of objective function and the efficient frontier of portfolio selection model minimizing kurtosis is deduced theoretically. Finally, the theoretical efficient frontier and the effectiveness of semidefinite programming relaxation are verified through empirical analysis.
2009 International Conference on Management and Service Science, 2009
The risk control of accounting policy choice is the key to ensure accounting information quality,... more The risk control of accounting policy choice is the key to ensure accounting information quality, reduce financial risk and implement internal control effectively. And it also has important significance for improving enterprises' anti-risk ability, increasing enterprise value and promoting resource optimal allocation. Stakeholders participating in accounting policy choice (SPAPC), it can form mutual restriction of stakeholders and different stakeholders will compare the benefits of various accounting policy choices. The choice will stabilize at the one which can reflect enterprises' management state fairly. And this choice can balance all stakeholders' interest under the condition of avoiding moral hazard. At last, enterprise should establish SPAPC system and disclosure information during SPAPC process.
Picritic lava flows near Lijiang in the late Permian Emeishan flood basalt province are associate... more Picritic lava flows near Lijiang in the late Permian Emeishan flood basalt province are associated with augite-phyric basalt, aphyric basalt, and basaltic pyroclastic units. The dominant phenocryst in the picritic flows is Mg-rich olivine (up to 91. 6% forsterite component) with high CaO contents (to 0. 42 wt %) and glass inclusions, indicating that the olivine crystallized from a melt. Associated chromite has a high Cr-number (73-75). The estimated MgO content of the primitive picritic liquids is about 22 wt %, and initial melt temperature may have been as high as 1630-1690 C. The basaltic lavas appear to be related to the picritic ones principally by olivine and clinopyroxene fractionation. Agecorrected Nd-Sr-Pb isotope ratios of the picritic and basaltic lavas are indistinguishable and cover a relatively small range [e.g. e Nd (t) ¼ À1. 3 to þ4. 0]. The higher e Nd (t) lavas are isotopically similar to those of several modern oceanic hotspots, and have oceanisland-like patterns of alteration-resistant incompatible elements. Heavy rare earth element characteristics indicate an important role for garnet during melting and that the lavas were formed by fairly small degrees of partial melting. Rough correlations of isotope ratios with ratios of alteration-resistant highly incompatible elements (e.g. Nb/La) suggest modest amounts of contamination involving continental material or a relatively low-e Nd component in the source. Overall, our results are consistent with other evidence suggesting some type of plume-head origin for the Emeishan province.
Journal of agricultural and food chemistry, Jan 28, 2009
The invasive plant Eupatorium adenophorum Spreng. (or Ageratina adenophora (Spreng.) King and Rob... more The invasive plant Eupatorium adenophorum Spreng. (or Ageratina adenophora (Spreng.) King and Robinson) (Compositae) has caused great economic loss in China, especially the southwestern region, and is gravely threatening the native biodiversity. The aerial part of this plant was phytochemically investigated for its allelochemicals. Eleven terpenes (2 monoterpenes and 9 sesquiterpenes) were isolated and identified, which include a new monoterpene, (-)-(1R*,2S,*4R*,5S*)-3,3-dimethyl-5-hydroxybicyclo[2,2,1]hept-2-ylmethanol (1), two new cadinane sesquiterpenes, (-)-(5S*,6S*,7S*,9R*,10S*)-7-hydroxy-5,7-epidioxycadinan-3-ene-2-one (2) and (+)-(5S*,6R*,9R*,10S*)-5,6-dihydroxycadinan-3-ene-2,7-dione (3), and eight known terpene compounds (4, 6-12). The new structures were established by spectroscopic studies such as 1D- and 2D-NMR and MS analyses. Meanwhile, the potential allelopathic effects of these compounds on the Arabidopsis seeds germination were tested. Compounds 3 and 7 retarded th...
Damage-modified nonlinear viscoelastic constitutive equation and failure criterion are introduced... more Damage-modified nonlinear viscoelastic constitutive equation and failure criterion are introduced and the three-dimensional incremental forms are deduced based on the updated Lagrangian approach. A simple tensile test model and a split Hopkinson pressure bar model are built to verify the accuracy of the subroutine implemented within the non-linear finite element program LS-DYNA. A numerical model of bird strike on windshield is established to study the responses of windshield under three different bird velocities at three sites. The bird is represented by a cylinder with a hemisphere at each end and the contact-impact coupling algorithm is used in this study. It is found that the implemented subroutine can properly describe the mechanical behavior of polymethyl methacrylate under low and high strain rates and large deformation, and can be used validly.
Two new taxoids called 7,13-dideacetyl-9,10-debenzoyl-7b b,9a a-p-hydroxylbenzylidenedioxy-taxchi... more Two new taxoids called 7,13-dideacetyl-9,10-debenzoyl-7b b,9a a-p-hydroxylbenzylidenedioxy-taxchinin C (1) and 7,13-dideacetyl-2,9,10-debenzoyl-2-tigloyl-7b b,9a a-p-hydroxylbenzylidenedioxy-taxchinin C (2) were isolated from the leaves and stems of Taxus chinensis. They represent the first examples of taxoids containing the 5/7/6membered ring system with 7b b,9a a-p-hydroxylbenzylidenedioxy groups, the structures of which were elucidated based on spectroscopic analyses, especially 1D and 2D NMR spectra.
We report concentrations of platinum group elements (PGE: Os, Ir, Ru, Rh, Pt and Pd) for picrite-... more We report concentrations of platinum group elements (PGE: Os, Ir, Ru, Rh, Pt and Pd) for picrite-basalt lavas of the Emeishan large igneous province, SW China. The absolute concentrations of Os in most of the Emeishan picrites are higher than in picrites from ocean islands and other continental flood basalt provinces, and in estimated primitive mantle. A roughly positive correlation between MgO and Cr and Ni, and no overall correlation of Os or Ir with MgO, show that no Cu-Ni sulfide fractionated during differentiation but rather that olivine and chromite fractionated, implying that the initial picritic magma was sulfide-undersaturated. In addition, Os/Ir ratios are unusually high, suggesting that the picritic magmas may have been contaminated by black shales. Modeling shows that a 7% partial melt of primitive mantle containing 0.01 wt% of sulfides can account for the observed Os, Ir and Ru concentrations in the most primitive picrite if the melt is contaminated by 10 wt% of black shale en route to the surface.
In gas well testing process,borehole fluid flow distribution is inconsistent under different work... more In gas well testing process,borehole fluid flow distribution is inconsistent under different work regimes.In wellhead shut-in pressure survey,the pressure gauge distance from middle part of a reservoir,phase state differentiation and gravity differentiation have some impact on shut-in pressure data.Based on bottom hole pressure changes recorded in process of a gas well testing,this paper analyzes such fluid flow variation and the causes of little pressure drop after shut-in.it is shown that the process of bottom hole liquid loading at early shut-in and liquid submerging the pressure gauge appears slope line that measured points deviate from theoretical points in the double logarithmic early diagnosis diagram.The results are of a certain significance for pressure data analysis and processing.
In order to predict accurately the characteristics of supersonic flow in new type externally pres... more In order to predict accurately the characteristics of supersonic flow in new type externally pressurized spherical air bearings under large bearing clearance and high air supply pressure, which could decrease their load carrying capacity and stability, a CFDbased analysis was introduced to solve the threedimensional turbulent complete compressible air flow governing equations. The realizable κ−ε model was used as a turbulent closure. The supersonic flow field near air inlets was analyzed. The flow structures illustrate that the interaction exists between shock waves and boundary layer, and the flow separation is formed at the lower corner and the lower wall around the point of a maximum velocity. The numerical results show that the conversion from supersonic flow to subsonic flow in spherical air bearing occurs through a shock region (pseudoshock), and the viscous boundary layer results in the flow separation and reverse flow near the shock. The calculation results basically agree with the corresponding experimental data.
In the present study, a series of tests were conducted on aluminum alloy 2024 to investigate the ... more In the present study, a series of tests were conducted on aluminum alloy 2024 to investigate the effect of detail design on the fatigue behavior of fastener holes in specimens. Two types of detail designs were concerned. One was the mode of fastener holes (countersunk rivet or countersunk bolt), the other was drilling process (traditional air-drilling process or one step compound cutting process). The fracture surfaces were observed by means of an optical microscope. Finite element method (FEM) was employed to analyze the distribution of stress around the fastener holes. The results showed that crack always initiated at the hole edge where the stress concentration occurred. Crack initiation was induced by stress concentration. Crack initiation life accounted for 80% of total fatigue life of fastener holes. The fatigue life of fastener hole using countersunk rivet was longer than that using countersunk bolt. Contrasted to traditional air-drilling process, the fatigue life of fastener hole could be improved by 44-55% using one step compound cutting process. However, the dispersibility of fatigue life became increasingly severe when fatigue life was prolonged.
2013 International Conference on Management Science and Engineering 20th Annual Conference Proceedings, 2013
The purpose of this paper is to explore the influence ways of eXtensible Business Reporting Langu... more The purpose of this paper is to explore the influence ways of eXtensible Business Reporting Language (XBRL) for the accounting information quality. The research finds three accounting information quality standards. They are respectively: general quality standards, conversion quality standards and enhance quality standards. According to the three standards, the research put forward three influence ways and some concrete countermeasures. First, improving the relevance, objectivity, comparability and intelligibility could improve the general quality of accounting information. Second, improving the conversion authenticity, technical compliance and security could improve the conversion quality of accounting information. Third, improving the personality relevance, data efficiency and wide application could improve the enhance quality of accounting information. General accounting information quality is the foundation, conversion accounting information quality is the guarantee and enhance accounting information quality must further enhance the efficiency of the accounting information and capital allocation efficiency.
2011 International Conference on Management Science & Engineering 18th Annual Conference Proceedings, 2011
With the nor-normal distribution and nor-binomial utility function of investors, higher-order mom... more With the nor-normal distribution and nor-binomial utility function of investors, higher-order moments should be taken into consideration with portfolio selection. So far, studies on portfolio selection with higher-order moments are mainly conducted under the framework of mean-variance-skewness while kurtosis is seldom taken into account. But many literatures have pointed out kurtosis play more important role in portfolio selection than variance and skewness. So, in order to fill up the study gap, portfolio selection with higher-order moments will be studied, under the framework of mean-variance-skewness-kurtosis, in this paper. Firstly, the optimization model of portfolio selection with kurtosis minimization is set up. Then, semidefinite programming relaxation is suggested based on research results of Lasserre and Waki to resolve the difficulty of model solution from the higher order and non-convexity of objective function and the efficient frontier of portfolio selection model minimizing kurtosis is deduced theoretically. Finally, the theoretical efficient frontier and the effectiveness of semidefinite programming relaxation are verified through empirical analysis.
2009 International Conference on Management and Service Science, 2009
The risk control of accounting policy choice is the key to ensure accounting information quality,... more The risk control of accounting policy choice is the key to ensure accounting information quality, reduce financial risk and implement internal control effectively. And it also has important significance for improving enterprises' anti-risk ability, increasing enterprise value and promoting resource optimal allocation. Stakeholders participating in accounting policy choice (SPAPC), it can form mutual restriction of stakeholders and different stakeholders will compare the benefits of various accounting policy choices. The choice will stabilize at the one which can reflect enterprises' management state fairly. And this choice can balance all stakeholders' interest under the condition of avoiding moral hazard. At last, enterprise should establish SPAPC system and disclosure information during SPAPC process.
Picritic lava flows near Lijiang in the late Permian Emeishan flood basalt province are associate... more Picritic lava flows near Lijiang in the late Permian Emeishan flood basalt province are associated with augite-phyric basalt, aphyric basalt, and basaltic pyroclastic units. The dominant phenocryst in the picritic flows is Mg-rich olivine (up to 91. 6% forsterite component) with high CaO contents (to 0. 42 wt %) and glass inclusions, indicating that the olivine crystallized from a melt. Associated chromite has a high Cr-number (73-75). The estimated MgO content of the primitive picritic liquids is about 22 wt %, and initial melt temperature may have been as high as 1630-1690 C. The basaltic lavas appear to be related to the picritic ones principally by olivine and clinopyroxene fractionation. Agecorrected Nd-Sr-Pb isotope ratios of the picritic and basaltic lavas are indistinguishable and cover a relatively small range [e.g. e Nd (t) ¼ À1. 3 to þ4. 0]. The higher e Nd (t) lavas are isotopically similar to those of several modern oceanic hotspots, and have oceanisland-like patterns of alteration-resistant incompatible elements. Heavy rare earth element characteristics indicate an important role for garnet during melting and that the lavas were formed by fairly small degrees of partial melting. Rough correlations of isotope ratios with ratios of alteration-resistant highly incompatible elements (e.g. Nb/La) suggest modest amounts of contamination involving continental material or a relatively low-e Nd component in the source. Overall, our results are consistent with other evidence suggesting some type of plume-head origin for the Emeishan province.
Journal of agricultural and food chemistry, Jan 28, 2009
The invasive plant Eupatorium adenophorum Spreng. (or Ageratina adenophora (Spreng.) King and Rob... more The invasive plant Eupatorium adenophorum Spreng. (or Ageratina adenophora (Spreng.) King and Robinson) (Compositae) has caused great economic loss in China, especially the southwestern region, and is gravely threatening the native biodiversity. The aerial part of this plant was phytochemically investigated for its allelochemicals. Eleven terpenes (2 monoterpenes and 9 sesquiterpenes) were isolated and identified, which include a new monoterpene, (-)-(1R*,2S,*4R*,5S*)-3,3-dimethyl-5-hydroxybicyclo[2,2,1]hept-2-ylmethanol (1), two new cadinane sesquiterpenes, (-)-(5S*,6S*,7S*,9R*,10S*)-7-hydroxy-5,7-epidioxycadinan-3-ene-2-one (2) and (+)-(5S*,6R*,9R*,10S*)-5,6-dihydroxycadinan-3-ene-2,7-dione (3), and eight known terpene compounds (4, 6-12). The new structures were established by spectroscopic studies such as 1D- and 2D-NMR and MS analyses. Meanwhile, the potential allelopathic effects of these compounds on the Arabidopsis seeds germination were tested. Compounds 3 and 7 retarded th...
Damage-modified nonlinear viscoelastic constitutive equation and failure criterion are introduced... more Damage-modified nonlinear viscoelastic constitutive equation and failure criterion are introduced and the three-dimensional incremental forms are deduced based on the updated Lagrangian approach. A simple tensile test model and a split Hopkinson pressure bar model are built to verify the accuracy of the subroutine implemented within the non-linear finite element program LS-DYNA. A numerical model of bird strike on windshield is established to study the responses of windshield under three different bird velocities at three sites. The bird is represented by a cylinder with a hemisphere at each end and the contact-impact coupling algorithm is used in this study. It is found that the implemented subroutine can properly describe the mechanical behavior of polymethyl methacrylate under low and high strain rates and large deformation, and can be used validly.
Two new taxoids called 7,13-dideacetyl-9,10-debenzoyl-7b b,9a a-p-hydroxylbenzylidenedioxy-taxchi... more Two new taxoids called 7,13-dideacetyl-9,10-debenzoyl-7b b,9a a-p-hydroxylbenzylidenedioxy-taxchinin C (1) and 7,13-dideacetyl-2,9,10-debenzoyl-2-tigloyl-7b b,9a a-p-hydroxylbenzylidenedioxy-taxchinin C (2) were isolated from the leaves and stems of Taxus chinensis. They represent the first examples of taxoids containing the 5/7/6membered ring system with 7b b,9a a-p-hydroxylbenzylidenedioxy groups, the structures of which were elucidated based on spectroscopic analyses, especially 1D and 2D NMR spectra.
We report concentrations of platinum group elements (PGE: Os, Ir, Ru, Rh, Pt and Pd) for picrite-... more We report concentrations of platinum group elements (PGE: Os, Ir, Ru, Rh, Pt and Pd) for picrite-basalt lavas of the Emeishan large igneous province, SW China. The absolute concentrations of Os in most of the Emeishan picrites are higher than in picrites from ocean islands and other continental flood basalt provinces, and in estimated primitive mantle. A roughly positive correlation between MgO and Cr and Ni, and no overall correlation of Os or Ir with MgO, show that no Cu-Ni sulfide fractionated during differentiation but rather that olivine and chromite fractionated, implying that the initial picritic magma was sulfide-undersaturated. In addition, Os/Ir ratios are unusually high, suggesting that the picritic magmas may have been contaminated by black shales. Modeling shows that a 7% partial melt of primitive mantle containing 0.01 wt% of sulfides can account for the observed Os, Ir and Ru concentrations in the most primitive picrite if the melt is contaminated by 10 wt% of black shale en route to the surface.
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