Numerical simulation of 2219 aluminum alloy flat under the condition of subsection welding or no subsection welding was analyzed by the double ellipsoidal heat source model. The result shows that the residual tensile ...Numerical simulation of 2219 aluminum alloy flat under the condition of subsection welding or no subsection welding was analyzed by the double ellipsoidal heat source model. The result shows that the residual tensile stress of subsection welding appears in the weld and nearby areas while the peak value appears in the weld. The subsection welding can greatly increase the low stress area in the weld. Moreover, the contrast of stress between the subsection welding and no subsection welding shows that if the welding sequence, namely that the double ends of the weld are welded first and then the middle part is welded, is adopted in the subsection welding, the peak value of residual tensile stress can be greatly decreased.展开更多
The Northern Shaanxi salt basin locates in the east of the Ordos basin.In this area,the thick layer salt sediment exists in the Majiagou Formation of Ordovician.Especial in the sixth subsection of the Majiagou fifth m...The Northern Shaanxi salt basin locates in the east of the Ordos basin.In this area,the thick layer salt sediment exists in the Majiagou Formation of Ordovician.Especial in the sixth subsection of the Majiagou fifth member,it展开更多
It was showed that understanding of the diagenetic modifications and its associated products in the deeply to ultra-deeply buried tight sandstone reservoirs(DUDTSR)is great important for reservoir characterization and...It was showed that understanding of the diagenetic modifications and its associated products in the deeply to ultra-deeply buried tight sandstone reservoirs(DUDTSR)is great important for reservoir characterization and hydrocarbon prediction.However,the fine characterization of diagenetic evolution via geologic modelling in tight sandstones remains a great challenge as for complexity of lithology,temperature,pressure and formation fluid throughout the entire life cycle of tight sandstone reservoirs.To help get a comprehensive idea of the distribution of diagenetic processes on the formation of DUDTSR in the long geological period,type-I and type-II fine sections of diagenetic stage for clastic reservoirs were creatively proposed and its essence was illustrated using the Paleogene Huagang(EH)Formation in the southern Xihu Sag.Through combination of both quantitative and qualitative methods which began with current formation temperature,vitrinite analysis,illite and I/S mixed layers based on analytical testing of the EH Formation,(1)Paleotemperature(T),vitrinite reflectivity and smectite in mixed layer during burial processes were restored based on numerical analysis,(2)The accurate division of diagenetic evolution was identified from coarse to fine process using new model,(3)And finally the geological significance of fine division of the conventional diagenetic stage was illustrated for low-porosity and tight sandstone reservoirs.展开更多
The analysis of circuits is frequently required in the electricity of physics. When analyzing circuits, the general idea is to study the issues related to nonlinear resistance circuits based on commonly used physical ...The analysis of circuits is frequently required in the electricity of physics. When analyzing circuits, the general idea is to study the issues related to nonlinear resistance circuits based on commonly used physical and electrical theory. Generally, circuits can be divided into linear resistance circuits and nonlinear resistance circuits. However, for some nonlinear resistance circuit, a small part of them are decomposed through subsection linearity while most of them are adopted the form of hieroglyph combination for subsection decomposition fitting analysis. For the following contents, the author will adopt curve layout method to analyze nonlinear resistance element and relation characteristics of voltage and current;to state the characteristics and nature of common electronic elements in our life, and concepts of concave resistance and convex resistance;to analyze the characteristics of nonlinear resistance circuits through electrical circuit analysis method based on the electrical theorem of physics;finally, to analyze referring to actual cases, study the veracity, verify the feasibility and scientificity of the adopted analytical approach, apply image graphics of the resistance circuits in the convenient way to solve complicated design problems among actual electrical problems.展开更多
文摘Numerical simulation of 2219 aluminum alloy flat under the condition of subsection welding or no subsection welding was analyzed by the double ellipsoidal heat source model. The result shows that the residual tensile stress of subsection welding appears in the weld and nearby areas while the peak value appears in the weld. The subsection welding can greatly increase the low stress area in the weld. Moreover, the contrast of stress between the subsection welding and no subsection welding shows that if the welding sequence, namely that the double ends of the weld are welded first and then the middle part is welded, is adopted in the subsection welding, the peak value of residual tensile stress can be greatly decreased.
文摘The Northern Shaanxi salt basin locates in the east of the Ordos basin.In this area,the thick layer salt sediment exists in the Majiagou Formation of Ordovician.Especial in the sixth subsection of the Majiagou fifth member,it
基金Major Projects of National Science and Technology "Large Oil and Gas Fields and CBM Development" (Grant No.2016ZX05027-02–007)the National Natural Science Fund(Grant No.42072119)Open Foundation of Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education(China University of Geosciences)(Grant No.TPR-2021–08)。
文摘It was showed that understanding of the diagenetic modifications and its associated products in the deeply to ultra-deeply buried tight sandstone reservoirs(DUDTSR)is great important for reservoir characterization and hydrocarbon prediction.However,the fine characterization of diagenetic evolution via geologic modelling in tight sandstones remains a great challenge as for complexity of lithology,temperature,pressure and formation fluid throughout the entire life cycle of tight sandstone reservoirs.To help get a comprehensive idea of the distribution of diagenetic processes on the formation of DUDTSR in the long geological period,type-I and type-II fine sections of diagenetic stage for clastic reservoirs were creatively proposed and its essence was illustrated using the Paleogene Huagang(EH)Formation in the southern Xihu Sag.Through combination of both quantitative and qualitative methods which began with current formation temperature,vitrinite analysis,illite and I/S mixed layers based on analytical testing of the EH Formation,(1)Paleotemperature(T),vitrinite reflectivity and smectite in mixed layer during burial processes were restored based on numerical analysis,(2)The accurate division of diagenetic evolution was identified from coarse to fine process using new model,(3)And finally the geological significance of fine division of the conventional diagenetic stage was illustrated for low-porosity and tight sandstone reservoirs.
文摘The analysis of circuits is frequently required in the electricity of physics. When analyzing circuits, the general idea is to study the issues related to nonlinear resistance circuits based on commonly used physical and electrical theory. Generally, circuits can be divided into linear resistance circuits and nonlinear resistance circuits. However, for some nonlinear resistance circuit, a small part of them are decomposed through subsection linearity while most of them are adopted the form of hieroglyph combination for subsection decomposition fitting analysis. For the following contents, the author will adopt curve layout method to analyze nonlinear resistance element and relation characteristics of voltage and current;to state the characteristics and nature of common electronic elements in our life, and concepts of concave resistance and convex resistance;to analyze the characteristics of nonlinear resistance circuits through electrical circuit analysis method based on the electrical theorem of physics;finally, to analyze referring to actual cases, study the veracity, verify the feasibility and scientificity of the adopted analytical approach, apply image graphics of the resistance circuits in the convenient way to solve complicated design problems among actual electrical problems.
