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应用工程师问答—6 更好、更快的开放式回路增益量测
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作者 david hunter 《电子与电脑》 2008年第5期74-77,共4页
在采用回授的系统当中,回授网络乃是一组针对特定增益以及相位关系所设定的电路,例如可以藉由对回路增益亦或是相位进行巧妙控制,以确保稳定性的的可调节式比例-微分-积分(PID)控制器(参照图1所示)。通常我们会想要对此处于特殊设... 在采用回授的系统当中,回授网络乃是一组针对特定增益以及相位关系所设定的电路,例如可以藉由对回路增益亦或是相位进行巧妙控制,以确保稳定性的的可调节式比例-微分-积分(PID)控制器(参照图1所示)。通常我们会想要对此处于特殊设定状态下的回授网络进行性能的量测,以便建立起开放式回路的反应模型。但是要进行这种类型的量测往往是具有相当挑战性的。举例来说,积算器的低频率增益可能相当的高,往往会超过传统测试与量测设备的测量范围。进行这种量测的目的是为了要以既有的工具与少量的特殊电路,花费最小的力气,快速的将网络频率响应特性呈现出来。 展开更多
关键词 回路增益 开放式 量测 工程师 应用 频率响应特性 相位关系 特殊电路
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骨关节炎中的“肠道菌群-关节轴” 被引量:1
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作者 魏捷 张余庆 +2 位作者 david hunter 曾超 雷光华 《Science Bulletin》 SCIE EI CAS CSCD 2023年第8期759-762,共4页
Osteoarthritis(OA),the most common joint disorder,was reported to affect 7%of the global population,and the number of people with OA has increased by almost 50%from 1990 to 2019[1].OA can occur in almost any moveable ... Osteoarthritis(OA),the most common joint disorder,was reported to affect 7%of the global population,and the number of people with OA has increased by almost 50%from 1990 to 2019[1].OA can occur in almost any moveable joint;however,the most commonly affected joints are the knee,hip,and hand.Pain,swelling,and stiffness are the most common clinical symptoms. 展开更多
关键词 骨关节炎 肠道菌群 关节轴
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THE OPERATION OF A GIS-BASED DECISION SUPPORT SYSTEM FOR AUSTRALIAN LOCUST MANAGEMENT 被引量:4
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作者 Ted Deveson david hunter 《Entomologia Sinica》 CSCD 2002年第4期1-12,共12页
The Australian Plague Locust Commission (APLC) is responsible for the monitoring and control of locust populations that pose a threat to agriculture in the inland areas of four Australian States, a total area of 2 mil... The Australian Plague Locust Commission (APLC) is responsible for the monitoring and control of locust populations that pose a threat to agriculture in the inland areas of four Australian States, a total area of 2 million km\+2. A GIS based decision support system (DSS) is used to co ordinate the collection, processing, analysis and display of a range of spatial data for the forecasting of locust population development and to assist control operations. The resultant forecasts are used to help locate population aggregations early in a breeding sequence so as to enable effective preventive control. The data colection components of the DSS include wireless direct transfer of locust survey data from the field and daily internet collections of weather data. Locust distribution and age information is collected by APLC officers on regular vehicle surveys using GPS connected palmtop computers, and sent directly to a GIS server via high frequency (HF) radio modems. Locust reports from landholders and state extension staff are also incorporated into the system. The current survey data are used to estimate broad distributions, and to seed spatially explicit development models that can identify the timing of life stages that can be effectively managed. Information on the distribution of rainfall, temperature and wind fields is collected automatically from the internet and integrated with habitat information and locust distributions. Online weather data products from the Bureau of Meterology are also accessed regularly to assist in operational decision making. 展开更多
关键词 Geographic Information System decision support system Australian locusts
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FORECASTING AND MANAGEMENT OF MIGRATORY PESTS IN AUSTRALIA 被引量:2
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作者 david hunter Ted Deveson 《Entomologia Sinica》 CSCD 2002年第4期13-25,共13页
The Decision Support System (DSS) used by the Australian Plague Locust Commission for management of several important migratory insect pests in Australia is described. The DSS is based on a Geographic Information Sys... The Decision Support System (DSS) used by the Australian Plague Locust Commission for management of several important migratory insect pests in Australia is described. The DSS is based on a Geographic Information System that integrates data on weather and habitat condition with the migration, development and distribution of the pest to prepare forecasts and aid decisions for control. The GIS is module based with the number and nature of the modules easily modified depending on the detail of data required to manage the pest concerned. 展开更多
关键词 Decision Support MANAGEMENT migratory pests AUSTRALIA
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