The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers...The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers is verified by the test of the circuit and compared with other specific design of pulse generator for ultrasound driving purpose.展开更多
The teacher is the engineer of the human soul,and the noble teacher’s morality is the core professional quality of the teacher.Aiming at the problems existing in the construction of teachers’morality in colleges and...The teacher is the engineer of the human soul,and the noble teacher’s morality is the core professional quality of the teacher.Aiming at the problems existing in the construction of teachers’morality in colleges and universities,this paper puts forward the construction of college teachers’morality with the core values of socialism as the carrier.From improving the conditions for teachers’access,establishing and improving the teacher’s morality assessment mechanism,teacher cadre selection and employment mechanism,creating an environment of respecting teachers,cultural education,strengthening teachers’moral education and theoretical training,providing scientific research policy environent and solving teachers’actual conditions,permeate the core values of socialism throughout the whole process of the construction of teachers’morality in colleges and universities,from point to point and level to level,improve the quality of college teachers’moral construction.展开更多
Two 5-substituted tetrazoles, 5-(2-thienyl)-1,2,3,4-tetrazole (2-THTT) and 5-(4-pyridyl)-1,2,3,4-tetrazole (4-PYTT), as copper corrosion inhibitors in aerated 0.5 M H2SO4 solution were studied by using potentiodynamic...Two 5-substituted tetrazoles, 5-(2-thienyl)-1,2,3,4-tetrazole (2-THTT) and 5-(4-pyridyl)-1,2,3,4-tetrazole (4-PYTT), as copper corrosion inhibitors in aerated 0.5 M H2SO4 solution were studied by using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and quantum chemical calculation. Polarization curves indicate that inhibition efficiencies of tetrazoles increase with increasing inhibitors concentration. The electrochemical results show that the inhibition efficiency of 2-THTT is higher than that of 4-PYTT. Inhibition efficiency of 2-THTT reached 98.9% at very low concentrations (0.25 mM) by EIS, which makes 2-THTT an efficient inhibitor in aerated 0.5 M H2SO4 solution. The adsorption of 5-substituted tetrazoles on copper surface obeys the Langmuir isotherm. All the computed quantum chemical parameters are found to correlate well with experimental inhibition efficiencies of inhibitors.展开更多
文摘The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers is verified by the test of the circuit and compared with other specific design of pulse generator for ultrasound driving purpose.
文摘The teacher is the engineer of the human soul,and the noble teacher’s morality is the core professional quality of the teacher.Aiming at the problems existing in the construction of teachers’morality in colleges and universities,this paper puts forward the construction of college teachers’morality with the core values of socialism as the carrier.From improving the conditions for teachers’access,establishing and improving the teacher’s morality assessment mechanism,teacher cadre selection and employment mechanism,creating an environment of respecting teachers,cultural education,strengthening teachers’moral education and theoretical training,providing scientific research policy environent and solving teachers’actual conditions,permeate the core values of socialism throughout the whole process of the construction of teachers’morality in colleges and universities,from point to point and level to level,improve the quality of college teachers’moral construction.
文摘Two 5-substituted tetrazoles, 5-(2-thienyl)-1,2,3,4-tetrazole (2-THTT) and 5-(4-pyridyl)-1,2,3,4-tetrazole (4-PYTT), as copper corrosion inhibitors in aerated 0.5 M H2SO4 solution were studied by using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and quantum chemical calculation. Polarization curves indicate that inhibition efficiencies of tetrazoles increase with increasing inhibitors concentration. The electrochemical results show that the inhibition efficiency of 2-THTT is higher than that of 4-PYTT. Inhibition efficiency of 2-THTT reached 98.9% at very low concentrations (0.25 mM) by EIS, which makes 2-THTT an efficient inhibitor in aerated 0.5 M H2SO4 solution. The adsorption of 5-substituted tetrazoles on copper surface obeys the Langmuir isotherm. All the computed quantum chemical parameters are found to correlate well with experimental inhibition efficiencies of inhibitors.
