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Effects of electric parameters on corrosion resistance of anodic coatings formed on magnesium alloys

Transactions of Nonferrous Metals Society of China 2010年第B7期20卷 660-664页

作者：张淑芳胡光辉张荣发贾志翔王丽君王义君胡长员何向明 Jiangxi Key Laboratory of Surface Engineering Jiangxi Science and Technology Normal University School of Materials Science and Engineering Jiangxi Science and Technology Normal University School of Electronics Jiangxi University of Finance and Economics

Anodic coatings were obtained by micro-arc oxidation on AZ91HP magnesium alloys in a solution containing 10 g/L NaOH and 8 g/L phytic *** effects of electric parameters including frequency,final voltage,duty cycle and current density on the corrosion resistance of anodic coatings formed on the magnesium alloys were investigated by using an orthogonal experiment of four factors with three *** results show that the final voltage plays a main role on the coating *** orders of affecting corrosion resistance and coating thickness are separately ranked from high to low as,final voltage>duty cycle>current density>frequency and final voltage>current density>frequency>duty *** final voltage influences the corrosion resistance of the anodized samples mainly by changing the surface morphology and coating thickness.

关键词： magnesium alloys micro-arc oxidation electric parameters corrosion resistance

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Research on the ions’axial temperature of a sympathetically-cooled ^(113)Cd^(+)ion crystal

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Chinese Physics B 2021年第11期30卷 318-324页

作者： Nong-Chao Xin Sheng-Nan Miao Hao-Ran Qin Li-Ming Guo Ji-Ze Han Hua-Xing Hu Wen-Xin Shi Jian-Wei Zhang Li-Jun Wang State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China

Molecular dynamics simulation of a sympathetically-cooled ^(113)Cd^(+)ion crystal system is ***,the relationship between ions’axial temperature and different electric parameters,including radio frequency voltage and endcap voltage is *** stable trapping condition,optimum radio frequency voltage,corresponding to minimum temperature and the highest cooling efficiency,is *** temperature is positively correlated with end-cap *** relationship is also confirmed by a sympathetically-cooled ^(113)Cd^(+) microwave *** pseudo-potential model is used to illustrate the relationship and influence mechanism.A reasonable index,indicating ions’temperature,is proposed to quickly estimate the relative ions’*** investigation is helpful for ion crystal investigation,such as spatial configuration manipulation,sympathetic cooling efficiency enhancement,and temporal evolution.

关键词： ion temperature sympathetic cooling electric parameters microwave clock

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electrical stimulation modulates injury potentials in rats after spinal cord injury

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Neural Regeneration Research 2013年第27期8卷 2531-2539页

作者： Guanghao Zhang Xiaolin Huo Aihua Wang Changzhe Wu Cheng Zhang Jinzhu Bai Beijing Key Laboratory of Bioelectromagnetism Institute of Electrical EngineeringChinese Academy of Sciences Department of Spinal Surgery Beijing Boai HospitalChina Rehabilitation Research CenterCapital Medical University

An injury potential is the direct current potential difference between the site of spinal cord injury and the healthy nerves. Its initial amplitude is a significant indicator of the severity of spinal cord injury, and many cations, such as sodium and calcium, account for the major portion of injury potentials. This injury potential, as wel as injury current, can be modulated by direct current field stimulation;however, the appropriate parameters of the electrical field are hard to define. In this paper, injury potential is used as a parameter to adjust the intensity of electrical stimulation. Injury potential could be modulated to slightly above 0 mV （as the anode-centered group） by placing the anodes at the site of the injured spinal cord and the cathodes at the rostral and caudal sections, or around-70 mV, which is resting membrane potential （as the cathode-centered group） by reversing the polarity of electrodes in the anode-centered group. In addition, rats receiving no electrical stimulation were used as the control group. Results showed that the absolute value of the injury potentials acquired after 30 minutes of electrical stimulation was higher than the control group rats and much lower than the initial absolute value, whether the anodes or the cathodes were placed at the site of injury. This phenomenon il ustrates that by changing the polarity of the electrical field, electrical stimulation can effectively modulate the injury potentials in rats after spinal cord injury. This is also beneficial for the spontaneous repair of the cel membrane and the reduction of cation influx.

关键词： neural regeneration spinal cord injury injury potential electrical stimulation electric parameters cations resting membrane potential neural regeneration electrode stimulator charge balance grants-supported paper neuroregeneration

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