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In view of this, this paper attempts to take the overall situation of the port industry in our country as the background, Xigang northern zones anear oceans as the target, the SWOT as the analytic method, the analysis for the internal and external environment of Xigang northern zones anear oceans as the basis, in order to propose a comprehensive and systematic Xigang maritime economic zone development strategy.
鉴此,本文试图以我国港口业的总体状况为背景,以西岗临海地区为对象,运用 SWOT 分析法,在分析临海地区的内部环境和外部环境的基础上,立足西岗地区的未来,全面系统地论述了西岗临海经济带的发展战略,包括战略目标和战略定位,同时对实现西岗临海经济带战略目标的实施提出了相应的实施策略和建议,即加强临海地区的规划建设,完善临海地区服务体系,推动联合腹地共同发展,实现可持续发展以及发展西岗地区六大产业。
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ABSTRACT Aiming at problems of trans-vector controller in a vehicle-carried induction motor such as variable rotor and stator resistance following motor temperature, and their inductance varying with flux saturation degrees. Firstly, CSI and VSI are introduced, for CSI, it can hold the advantages both FOC and DTC using stator flux directional, PI parameter and simulation are also introduced. Secondly, equations of IM in the synchronous rotary frame and its static counterpart, as figuring in the saturation condition of magnetic field, are dealt in this paper and the simulation results are presented. Thereafter, the parameter designing of PI trans-vector controller is processed, which features the non-linear model. In practical realization, as neglecting the dynamical change of motor inductance, this paper employs online modification of inductance parameters, according to the flux saturation, then transforms the non-linear equations into linear ones, and so compacts the structure of controller. Thirdly, in view of the maximum torque output is extraordinary requisite when Electrical Vehicle start up, accelerate, and overtake, this paper issues the maximum torque when both inverter and battery capacity is corporeally definite. Fourthly, on-line differentiating and analyzing both rotor's time constants and its flux by using the expanding order reduction and discrete Kalman filter equation are fathomed, in order to realize high-performance trans-vector algorithm, and also the simulation results are presented. Fifthly, the close-loop regenerative brake system, when the EV's torque is set constant, is deduced; at the same time, unification of electric drive model and brake model is executed. Combined with maximum charge current demands, the mathematical model for online yielding torque as a demand.
本论文针对车载异步电机在矢量控制器所遇到的问题:定转子电阻随温度变化及随电机饱和程度变化的转子电感及定子电感而影响电机调速性能提出一套完整的解决方案:分析了电流型逆变器和电压型逆变器在实现矢量控制时控制器参数的计算,分析出对于电流型逆变器在采用定子磁场定向时,其性能同时具有矢量控制和直接转矩控制两者的优势,并对电压型逆变器在转子磁场定向下的模型进行了仿真研究;建立异步电机非线性模型,推导出考虑磁饱和时异步电机在同步旋转坐标系及静止坐标系下的方程,并做出了仿真结果,建立异步电机在非线性模型下的矢量控制调节器的PI参数设计,在实际应用中,若忽略电机电感的动态变化,可以根据当前的磁路饱和状态而在线修正电感参数,从而将非线性方程线性化,降低控制器的复杂度;考虑到电动汽车在起动和加速超车时需要电机有最大转矩输出,本文讨论在逆变器容量一定和电池供电能力有限的情况下电机最大转矩输出问题;推导了异步电机扩展降阶、离散卡尔曼滤波方程在线辨识转子时间常数和转子磁通,用于实现高性能的矢量控制算法,并给出了仿真结果;推导出了电动汽车恒转矩给定的闭环回馈制动系统,实现了电动控制模型和制动模型的统一,而且结合铅酸电池最大充电电流的要求,为制动转矩在线给定建立了数学模型;设计了基于双DSP系统的高性能矢量控制器软硬件框图,并以大量实验数据说明矢量控制在电动汽车应用的实际应用状况。
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It is a viable position and as you can see, the way Majorie shaped it, it doesn't read as a change of position as much as a refinement of your previous view.
这种立场是可行的。你从马乔里写的演说稿上可以看到就一点。它只是对你先前观点的修正,不会被看成是立场的改变。
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Night of Design 3.0: The Present Progressive reflects thoughts on and exploration into China's society and design as well as the definition and view about future. The exhibition tries to present the exploration and development of young leading-edge artists and designers in China as well as the development and endeavor of China's design education.
"设计3.0之夜:现在进行时"是面向中国社会与设计的思考和追问,是面向未来的定义与主张,展览力图呈现实践前沿的中国年青新锐艺术家与设计师的探索和发展,呈现中国设计教育前沿的发展和努力。
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Environmentalists such as McKibben view humans as rapacious consumers who devour as much as they can get their hands on.
McKibben 一样的环境论者,将人类视为贪得无厌的消费者,他们总是大肆挥霍掉能够得手的一切。
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Therefore, the part of analyzing questions compares and analyzesarchitectural elements involved in traditional folk houses and municipal housing from threeaspects such as world view of humanism, nature and psychology, which aims to seek a commonground between modern municipal housing and aspects of cultural recessiveness such ashumanism spirits involved in traditional residences. Then, this dissertation will put forward thedesign method concerning application of traditional folk houses" elements to modern housing, andthen try to change current drawbacks of municipal housing such as lack of expression and neglectof sensation, so that it is possible to explore another development path for people"s betterinhabitancy as well as to provide a new way of thought for forming resident architecture theorywith Chinese characteristic.
因此分析问题部分从自然观、人文观和心理观三方面对传统民居和城市住宅中的建筑元素进行比较分析,目的是找出传统民居中凝结的人文精神与情感智慧等文化隐性层面与当代城市住宅的契合点,提出传统民居元素在现代住宅中应用的设计方法,从而试图改变现有现代城市住宅"缺乏表情,忽视情感"等现有的缺憾,以期为人们更好地栖居生活探索另一条发展途径,也为形成有中国特色居住建筑理论提供一种新的思考方式。
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Our diplomacy should be tough, and the Ministry of Foreign Affairs or the military or have some influence as long as the government officials have a tough talk about it, then, Viet Nam and other countries will converge immediately, if, as mentioned below;"the South China Sea 12 nautical miles from land other than all the islands, reef sand, the dark beaches, all of China since ancient times, in view of the present annex are around the small country, has listed the common set of 2002's "Declaration on the Conduct of Parties in the South China Sea" as a matter of time in China is' to seek regional peace, we have rice to eat 'principle, and now it appears that the statement has been declared null and void, if necessary, China is determined to force to take the necessary measures to protect China's sovereignty."
我们的外交应该强硬了,外交部也好,军方也好,只要有一定影响的官员出来讲那么一句强硬的话,越南等国马上会收敛的,如果像下面讲的;"南海离陆地12海里以外的所有岛屿、礁沙、暗滩,古来就是中国所有,鉴于目前均被周围小国鲸吞,竟将2002年共同定立的《南海各方行为宣言》视为儿戏,当时中国是本着'寻求地区和平,有饭大家吃'的原则,现在看来,该宣言已废止,中国决心必要时采取必要的武力措施,保卫中国的主权"。
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The paper is mainly on the process control of NPP management from the view of proprietor, so it is of great pertinence for it involves the process controlling system, checking methods for the schedule, adjustment and optimization as well as various factors and analysis that influence the overall process. Meanwhile, the paper summarizes more practical checking and comparative methods as well as the application of software from the project management instead of discoursing on the adjustment for the original schedule from the angle of confusing network optimization, it is in this unique style that the research is naturally of more practical and appliable significance for the management of process control in nuclear plant.
本文主要从业主方面研究核电站项目管理的进度控制,从扩建工程的进度控制体系,进度计划的检查方法、计划的优化与调整,影响进度的各种原因及分析,并采取的有效措施,因而本文具有鲜明的针对性;本文未从复杂的网络优化的角度去论述对原进度计划进行调整,而是总结了项目管理中应用较多的检查、比较方法及项目管理软件的应用,从而使得本文的研究具有较强的可操作性,和实际应用意义。
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At the same time, another focus of this thesis is to explore the Sui Dynasty literary feature like using simplified language without too much modification as the general principle, and to take etiquette music as ideological core of orthodoxical Confucian view on literature and literary works, as well as how to generate and how to assess the whole process.
在牛弘身边,聚集了一大批南北士人共同参与制定国家统一后必要的文化制度,反映出这一时代最深刻的本质;作为典型的儒家知识分子,牛弘的政治理想和其文学创作是相辅相成的,政治上,他积极参与一些根本性的制度建设,文学观念上,尊崇儒家经典文本的权威性,因而其作品显而易见的价值取向就是这一思路的延伸和外化。
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In the 1970s he took the view, which he recognised as dissenting, that international trade should be, as he put it,"in some sense, managed" through import controls, adding unpersuasively that this was not really protectionism, since he did not want to reduce imports, merely the propensity to import; and protection should be "as minimally selective as possible".
在上世纪70年代他就以反对派得身份预言,国际贸易&从某种意义上说,应通过进口加以控制。&他解释道,这并是贸易保护主义,因为这种做法的初衷不在于减少进口,而在于遏制人们倾向于进口的嗜好———真正的贸易保护应该尽量排除人为因素。但这一看法却并不能在业界引起共鸣。
- 推荐网络例句
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They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.
他们没有侵略性,但我大喊,并在他们的方向扔石头让他们过的线索,远离我,以防万一。
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In slot 2 in your bag put wrapping paper, quantity does not matter in this case.
在你的书包里槽2把包装纸、数量无关紧要。
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Store this product in a sealed, lightproof, dry and cool place.
密封,遮光,置阴凉干燥处。