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基于PLC的真空沸腾式海水淡化过程控制系统设计 被引量:1
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作者 季明丽 周国华 +1 位作者 孙何敏 张昊天 《电子科学技术》 2017年第5期83-89,共7页
针对目前使用率极高的真空沸腾式船舶海水淡化装置进行分析调研,笔者发现其存在真空度不稳定、积盐严重及调控方式落后三大缺点。在对现用船舶海水淡化装置机械结构进行分析后,根据设计所需的控制参数要求,结合现代相对成熟的自动控制技... 针对目前使用率极高的真空沸腾式船舶海水淡化装置进行分析调研,笔者发现其存在真空度不稳定、积盐严重及调控方式落后三大缺点。在对现用船舶海水淡化装置机械结构进行分析后,根据设计所需的控制参数要求,结合现代相对成熟的自动控制技术,以三菱PLC为控制核心,PID为核心算法,各传感器及效力装置为辅,完成了船舶海水淡化系统设计改造。经调试,该系统可实现自动运行、报警、显示、参数检测等功能,极大地提高了海水淡化效率。 展开更多
关键词 船舶 海水淡化 传感器 PLC
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Nikethamide affects inspiratory neuron discharge in the nucleus retrofacialis medial region in brain slices from neonatal rats 被引量:2
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作者 Zhibin Qian mingli ji Zhonghai Wu 《Neural Regeneration Research》 SCIE CAS CSCD 2010年第4期287-290,共4页
BACKGROUND: Nikethamide, a respiratory center stimulant, is widely used in China. However, its effects on the central nervous system and medullary respiratory center remain poorly understood. OBJECTIVE: To investiga... BACKGROUND: Nikethamide, a respiratory center stimulant, is widely used in China. However, its effects on the central nervous system and medullary respiratory center remain poorly understood. OBJECTIVE: To investigate the influence of nikethamide on inspiratory neuron discharge in the medial region of the nucleus retrofacialis in neonatal rats, based on the observations addressing rhythmic respiratory discharge generated by the basic medullary respiratory center and various respiration neuron discharges in brain slices. DESIGN, TIME AND SETTING: A controlled, observational study utilizing in vitro neuroelectrophysiology was performed at the Department of Physiology in Southern Medical University between September and December in 2007. MATERIALS: Nikethamide was purchased from Sigma, USA; BL-420E biological signal collection and manaclement system was provided by Chengdu TME Technology, China.METHODS: Isolated medulla-spinal cord preparations were collected from neonatal Sprague Dawley rats, aged 1-3 days. Tissues were divided to include the medial region of the nucleus retrofacialis, ventral respiratory, and dorsal respiratory groups. Subsequently, modified Kreb's solution and 5 μg/mL nikethamide-containing modified Kreb's solution were consecutively perfused into the medial region of the nucleus retrofacialis in neonatal rat brain slices. MAIN OUTCOME MEASURES: Hypoglossal nerve root respiratory-related rhythmic discharge activities and inspiratory neuron discharges were recorded with an adsorption electrode and microelectrode. RESULTS Nikethamide resulted in prolonged inspiratory neuron discharge time, shortened respiratory cycle and expiratory time. Nikethamide intervention resulted in enhanced integral amplitude of some inspiratory neurons with no changes in discharge frequency or increased discharge frequency in remaining inspiratory neurons with no changes in integral amplitude. CONCLUSION: Nikethamide excites inspiratory neurons in the basic rhythmic respiration and medullary respiratory center, in addition to increased inspiratory neuron and neural network excitability. 展开更多
关键词 NIKETHAMIDE medial region of nucleus retrofacialis brainstem slices inspiratory neurons
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