研究确定英语动结构式的区别性特征,对其历史源流和发展脉络进行梳理,发现力的施受关系是贯穿其发展的核心语义特征。典型SVOC/A.结构表达S以V施力O并致其发生状态变化C,C由形容词性的A表示,排除语用限制,可释为"O BECOME A[as a r...研究确定英语动结构式的区别性特征,对其历史源流和发展脉络进行梳理,发现力的施受关系是贯穿其发展的核心语义特征。典型SVOC/A.结构表达S以V施力O并致其发生状态变化C,C由形容词性的A表示,排除语用限制,可释为"O BECOME A[as a result of S’V-ing(of it)]"。古英语时SVOC/A.初具规模,接纳少数动作动词和A,但A有时词性两可,中古英语时期,V和A数量猛增,A以形容词为主,词序日趋稳固,非典型动词和宾语出现,至早期现代英语时已臻成熟。展开更多
Twin-rotor cylinder-embedded piston engine is proposed for dealing with the sealing problems of rotors in twin-rotor piston engine where the existent mature sealing technologies for traditional reciprocating engine ca...Twin-rotor cylinder-embedded piston engine is proposed for dealing with the sealing problems of rotors in twin-rotor piston engine where the existent mature sealing technologies for traditional reciprocating engine can be applied.The quantity and forms of its sealing surfaces are reduced and simplified,and what's more,the advantages of twin-rotor piston engine are inherited,such as high power density and no valve mechanism.Given the motion law of two rotors,its kinematic model is established,and the general expression for some parameters related to engine performance,such as the trajectory,displacement,velocity and acceleration of the piston and centroid trajectory,angular displacement,velocity and acceleration of the rod are presented.By selecting different variation patterns of relative angle of two rotors,the relevant variables are compared.It can be concluded that by designing the relative angle function of two rotors,the volume variation of working chamber can be changed.However,a comprehensive consideration for friction and vibration is necessary because velocity and acceleration are quite different in the different functions,the swing magnitude of rod is proportional to link ratio λ,and the position of rod swing center is controlled by eccentricity e.In order to reduce the lateral force,a smaller value of λ should be selected in the case of the structure,and the value of e should be near 0.95.There is no relationship between the piston stroke and the variation process of relative angle of two rotors,the former is only proportional to the amplitude of relative angle of two rotors.展开更多
文摘研究确定英语动结构式的区别性特征,对其历史源流和发展脉络进行梳理,发现力的施受关系是贯穿其发展的核心语义特征。典型SVOC/A.结构表达S以V施力O并致其发生状态变化C,C由形容词性的A表示,排除语用限制,可释为"O BECOME A[as a result of S’V-ing(of it)]"。古英语时SVOC/A.初具规模,接纳少数动作动词和A,但A有时词性两可,中古英语时期,V和A数量猛增,A以形容词为主,词序日趋稳固,非典型动词和宾语出现,至早期现代英语时已臻成熟。
文摘Twin-rotor cylinder-embedded piston engine is proposed for dealing with the sealing problems of rotors in twin-rotor piston engine where the existent mature sealing technologies for traditional reciprocating engine can be applied.The quantity and forms of its sealing surfaces are reduced and simplified,and what's more,the advantages of twin-rotor piston engine are inherited,such as high power density and no valve mechanism.Given the motion law of two rotors,its kinematic model is established,and the general expression for some parameters related to engine performance,such as the trajectory,displacement,velocity and acceleration of the piston and centroid trajectory,angular displacement,velocity and acceleration of the rod are presented.By selecting different variation patterns of relative angle of two rotors,the relevant variables are compared.It can be concluded that by designing the relative angle function of two rotors,the volume variation of working chamber can be changed.However,a comprehensive consideration for friction and vibration is necessary because velocity and acceleration are quite different in the different functions,the swing magnitude of rod is proportional to link ratio λ,and the position of rod swing center is controlled by eccentricity e.In order to reduce the lateral force,a smaller value of λ should be selected in the case of the structure,and the value of e should be near 0.95.There is no relationship between the piston stroke and the variation process of relative angle of two rotors,the former is only proportional to the amplitude of relative angle of two rotors.
