No associated death of fish was reported , the spokesman said . red tide is a natural phenomenon . the afcd s proactive phytoplankton monitoring programme would continue monitoring red tide occurrences to minimise the impact on the mariculture industry 红潮的出现为自然现象，渔护署建立的浮游植物监测计划，将继续主动监测红潮出现的情况，以减低对本地海鱼养殖业可能造成的影响。
Red tide is a natural phenomenon . the agriculture , fisheries and conservation department s proactive phytoplankton monitoring programme will continue monitoring red tide occurrences to minimise the impact on the mariculture industry and the public 红潮的出现为自然现象，渔农自然护理署实施的浮游植物监测计划将继续主动监测红潮出现的情况，以减低对本地海鱼养殖业及市民可能造成的影响。
Both species are non - toxic . " red tide is a natural phenomenon . the agriculture , fisheries and conservation department s proactive phytoplankton monitoring programme will continue monitoring red tide occurrences to minimise the impact on the mariculture industry 红潮的出现为自然现象，渔农自然护理署建立的浮游植物监测计划，将继续主动监测红潮出现的情况，以减低对本地海鱼养殖业可能造成的影响。
This master dissertation derived from one of " the fifth strategic " items of chongqing . " the technology of initiatively monitoring the health and safety of infrastructure based on piezoelectricity " . it is a kind of monitor technology that has some characteristics , such as real time , online , undamaged and distribution 本硕士学位论文来源于重庆市“十五”攻关项目《压电式基础设施健康安全主动监测技术》 ，这是一种具有实时、在线、无损、分布式特性的监测技术，其目的在于为基础设施工程结构监测提供一种崭新的，而又切实可行、可靠的工程方法和仪器系统。
This study adopts active detection technique based on lamb wave to monitor damage in composite materials . pzt ceramics with the diameter of 8mm are bonded on the surface of fiberglass - reinforced composite material acting as both actuators and sensors to generate and collect lamb waves . the waves emitted interact with discontinuities and experience a change in their propagation characteristics when damage is generated 本文采用lamb波主动监测技术，利用粘贴在复合材料板表面的压电元件，通过选择恰当的激励信号，激励出可进行lamb波分析的主动监测信号，进而对监测信号进行分析及模式处理，初步实现了二维结构的损伤定位。
Pzt ceramics are bonded on the surface of fiberglass - reinforced composite materials acting as both actuators and sensors to generate and collect lamb wave . characteristic parameters are extracted from the filtered sensors signal by hht method . using these parameters in different methods for damage detection , the location and the degree of damage in the composite material can be determined 综上,本文采用lamb波主动监测技术,选择合适的激励信号,利用粘贴在复合材料结构表面上的压电元件,在复合材料结构中激发出lamb波并接收传感信号,利用hht方法分析经过滤波后的传感信号,提取出表示损伤的特征参数,运用不同的损伤识别方法实现对复合材料结构的损伤定位和损伤程度的识别。
The ideas of active health monitoring system are that use drives to activate signals of active health monitoring and sensors on another place or other places mounted on the same surface to recieve response signals of structure simultaneously and analyze signals which are the base of analyzing damages in the structure 主动监测系统的基本思想是:采用驱动器在复合材料表面激发主动监测信号,与此同时传感器在同一表面的其他一个或多个地方接收结构响应信号,并对信号进行分析,据此对结构中的损伤进行监测。
