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Single loop instantaneous voltage feedback control and multiple loop feedback control, which can be realized by digital method or analogue method, are normal control strategies of inverter. The controller's performance of a same control strategy designed by different designers is different This paper makes out uniform analysis and design theory of inverter control strategies with pole-assignment technique of state-space theory for the first time. It is firstly proposed that controller parameters being equal to control system orders is the base of realizing high performance inverter. Design and performance comparability of various controllers is presented with uniform pole-assignment method.
本文首次采用状态空间理论的极点配置技术,对逆变电源的几种控制策略进行了统一的分析和设计,首次提出控制器控制参数与控制系统阶数相等是高性能逆变器控制实现的基础,并通过极点配置这种统一的设计方法对各种控制器进行了设计和性能比较,分析了要考虑的一些非理想因素的影响。
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On the basis of the theory of option pricing,We study the connection between America call option and European call option;Under the assumption condition of Black-Scholes formula ,use the theory of martingales and stopping time,get the conclusion that: the price of America call option equals the price of European call option; Discuss some numeric computing methods of the put America option pricing, with the invarional inequaility for optimal stopping, prove the boundary property of America put option price ...
基于期权定价的基本理论,研究美式看涨期权与欧式看涨期权之间的关系;在Black-Sc holes公式假设条件下,利用鞅和停时理论,得美式看涨期权的价格与欧式看涨期权的价格相等;探讨美式看跌期权价格的数字化计算,在相关假设条件下,利用基于最优化时的变分不等式证明了美式看跌期权价格的有界性,并介绍了几种美式看跌期权价格的数字化计算方法。
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The two Fraunhofer lines at 688nm and 760nm are obvious in the radiance spectra by ASD FieldSpec Pro NIR spectrometer,which largely overlap the chlorophyll fluorescence emission spectrum of leaves.
第三,研究并分析了夫琅和费暗线方法计算的688nm和760nm波段的荧光特性,结果表明该方法计算的荧光是可靠的,它与光合有效辐射关系密切,复相关系数达到了0.9;冬小麦冠层荧光光谱在760nm和688nm波段的荧光大小基本相等,而地锦冠层荧光光谱在688nm波段的荧光强度是760nm的3倍左右,表明荧光光谱能够更加敏感地反映植被物种或生理生化状况的差别。
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In 1976, the International Astronomical Union revised the definition of the AU for greater precision, defining it as that length for which the Gaussian gravitational constant takes the value 0.01720209895 when the units of measurement are the astronomical units of length, mass and time.
但实际上地球绕日的轨道不是一个圆形,而是一个椭圆形:最初天文单位的定义就是上述椭圆的半长轴的长度。1976年,国际天文学联会把一天文单位定义为一颗质量可忽略、公转轨道不受干扰而且公转周期为365.2568983日的粒子与一个质量相等约一个太阳的物体的距离。
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W. Ehm gave this stochastic processes in 1981, and he obtained most of the exact Hausdorff measure functions for the sets of the range and graph of the processes, excluding some special cases, i.
Ehm在1981年给出了这类过程的定义,并得到了除一些特殊情况(即当稳定过程所在的参数空间的维数与它的特征指标的乘积恰好与稳定过程所取值的空间的维数相等)外,该过程的像集和图集的确切Hausdorff测度函数。W。
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The incomparability comes from two sources: the first is the problem of statistic system. The income data in China are distinct surveys, using different questionnaires and administered by different units within National Bureau of Statistics. The second is the problem of China's economic structure. China's current dual economic structure determines the disparity between rural and urban residents.
所谓"不可比性"主要包括两层含义;首先是统计数据本身的问题,国家统计机关公布的居民收入分配数据分为"城镇居民"和"乡村居民"两部分,在统计口径、数据结构和公布形式上都存在差异;其次是城乡二元结构体制的存在所决定的不可比性,即中国目前的城乡二元结构体制造成了城、乡居民经济生活形态的差异,同等"收入"为城、乡居民带来的购买能力、生活质量和财富水平并不相等。
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Equal percentage flow characteristics - ideal for the spool stroke of equal increments, changes in flow rate for the trip can be expressed as changes of flow in a constant percentage.
等百分比流量特性-理想地,对于阀芯行程的相等增量,流量对于行程的改变可以表示为在改变时的流量的一个恒定的百分比。
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The end linking the timing gears cap, the side wall of cylinder and the skirt section of the engineblock are the sound radiation resources of the two engineblock sides. Except that, this thesis calculates sound power level of radiated noise from the engineblock with MATV method. It is found that the noise radiated from the engineblock is slightly loud.
此外本文还应用MATV法计算了气缸体辐射噪声的声功率级,通过声功率级的计算发现:气缸体的辐射噪声偏高,达到了108.84dBA,并且在850Hz时,由于气缸体的激励频率与其第八阶固有频率相等,气缸体发生了共振,因而在该频率时,气缸体的辐射噪声最大,所占气缸体表面辐射噪声总能量比重也最高,该频率应该是本文噪声控制关心的重点。
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Each packet makesone quart.E-9971 Tangerine/Orange FlavorEo9973 Concord Grape Flavor15A fun way to get good stuff in fruits and vegetablesA NUTRILITE~ FRUJI CONCENTRATED FRUITS ANDVEGETABLES BARAs part of a meal or a between-meal snack, this cranberry-raspberry flavored bar gives kids the nutritional equivalentof three whole, peeled apples, the added benefits of theexclusive NUTRILITE Phytonutrient Concentrate, and keyphytonutrients in amounts equal to those found in 5+ servingsof fruits and vegetables.
各个小包牌子一夸脱。E-9971 蜜桔橙色味道Eo9973 一致葡萄味道15乐趣方式得到好材料在水果和蔬菜NUTRILITE~ FRUJI 被集中的果子和菜酒吧作为膳食或在之间膳食快餐一部分,这个蔓越桔莓调味的酒吧给孩子营养等值三整体,被剥皮的苹果,增加的好处的专属NUTRILITE Phytonutrient 集中,并且钥匙phytonutrients 在数额相等与那些发现了在5+服务水果和蔬菜。
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"The cherubs dominate the sky, tumbling softly through the clouds like balls of pink and white cotton wool… They are ornaments with little religious significance, and the pictures title, equating cherubs with children, denotes the fine line which Fragonard has happily crossed between religious symbolism and a purely decorative art."
&小天使支配天,摔跤柔和地穿过粉红色的云象球和白色棉絮…他们是装饰有少许虔诚的重要性,和画头衔,使相等小天使有孩子,指示美好的线哪个Fragonard幸福地十字的在中间虔诚的象征主义和纯粹地装饰的article 冠词&
- 推荐网络例句
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As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.
每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。
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Maybe they'll disappear into a pothole.
也许他们将在壶穴里消失
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But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.
但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。