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浅谈工程建设投资控制
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作者 严振石 《珠江水运》 2000年第6期32-34,共3页
工程项目建设是一个周期长、涉及专业多、数量大的生产消费过程,要在一个较长时间内且外界条件不断变化的情况下,将项目投资控制在一个确定的目标下是很困难的。为了克服困难达到目标,必须将项目投资控制贯穿于建设的全过程,实行全过程... 工程项目建设是一个周期长、涉及专业多、数量大的生产消费过程,要在一个较长时间内且外界条件不断变化的情况下,将项目投资控制在一个确定的目标下是很困难的。为了克服困难达到目标,必须将项目投资控制贯穿于建设的全过程,实行全过程管理。全过程是指从建设项目的酝酿提出。 展开更多
关键词 工程项目建设 控计目标 主动
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Optimization and Control of Extractive Distillation with Heat Integration for Separating Benzene/Cyclohexane Mixtures 被引量:3
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作者 Li Lumin Tu Yangqin +2 位作者 Guo Lianjie Sun Lanyi Tian Yuanyu 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2016年第4期117-127,共11页
In this work, the extractive distillation with heat integration process is extended to separate the pressure-insensitive benzene-cyclohexane azeotrope by using furfural as the entrainer. The optimal design of extracti... In this work, the extractive distillation with heat integration process is extended to separate the pressure-insensitive benzene-cyclohexane azeotrope by using furfural as the entrainer. The optimal design of extractive distillation process is established to achieve minimum energy requirement using the multi-objective genetic algorithm, and the results show that energy saving for this heat integration process is 15.7%. Finally, the control design is performed to investigate the system's dynamic performance, and three control structures are studied. The pressure-compensated temperature control scheme is proposed based on the first two control structures, and the dynamic responses reveal that the feed disturbances in both flow rate and benzene composition can be mitigated well. 展开更多
关键词 extractive distillation heat integration optimization genetic algorithm dynamic simulation
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Intelligent Tracking Telescope Using Embedded Microcontrollers
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作者 Bassam Shaer David Cudney 《Computer Technology and Application》 2011年第11期849-857,共9页
This paper presents the design and implementation of the embedded microcontrollers within a telescope control system. The design objectives of the overall system are to automatically find light emitting objects at nig... This paper presents the design and implementation of the embedded microcontrollers within a telescope control system. The design objectives of the overall system are to automatically find light emitting objects at night within a user specified area, to track a light emitting object for a user specified time given the initial position of the object, and to allow the user access to these functions through a graphical user interface. The embedded system is used to provide a communication link between the graphical user interface and system hardware, to provide angle data processing for a dual axis accelerometer, to provide data processing for an electronic compass, and to provide pulse outputs for the step and direction inputs of three stepper motor drives. This paper will describe the design, implementation, and results of each of these objectives. 展开更多
关键词 INTELLIGENT TRACKING TELESCOPE electronic compass.
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