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
The Malaysian government has carefully crafted policies to ensure that the nation achieves its aspirational goal to become a developed nation by 2020. Crucial for which is the success of the Securities Commission＇s ...The Malaysian government has carefully crafted policies to ensure that the nation achieves its aspirational goal to become a developed nation by 2020. Crucial for which is the success of the Securities Commission＇s ＂Corporate Governance Blueprint 2011＂ and ＂Capital Market Master Plan 2＂ designed to provide a business environment which attracts investment and talent. Somewhat overlooked in these otherwise robust policy shifts has been a critical critique of the definition, nature, and purpose of corporate governance itself. Recognizing this oversight, Tan Sri Muhyiddin Yassin, Malaysia＇s Deputy Prime Minister, has directed that the definition of corporate governance be rejuvenated for the 21st century. This paper looks to answer that challenge by recommending the following transformational definition for corporate governance： ＂the proactive implementation of accountable ethical processes, procedures, and policies that inspires innovative aspirational economic activity to produce sustainable wealth and prosperity for shareholders, stakeholders, and society＂.展开更多
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.
文摘The Malaysian government has carefully crafted policies to ensure that the nation achieves its aspirational goal to become a developed nation by 2020. Crucial for which is the success of the Securities Commission＇s ＂Corporate Governance Blueprint 2011＂ and ＂Capital Market Master Plan 2＂ designed to provide a business environment which attracts investment and talent. Somewhat overlooked in these otherwise robust policy shifts has been a critical critique of the definition, nature, and purpose of corporate governance itself. Recognizing this oversight, Tan Sri Muhyiddin Yassin, Malaysia＇s Deputy Prime Minister, has directed that the definition of corporate governance be rejuvenated for the 21st century. This paper looks to answer that challenge by recommending the following transformational definition for corporate governance： ＂the proactive implementation of accountable ethical processes, procedures, and policies that inspires innovative aspirational economic activity to produce sustainable wealth and prosperity for shareholders, stakeholders, and society＂.
