查询词典 delta

The controller makes the closed-loop systems internally stable and minimizes the H2 norm of the transfer matrix Tzw from w to z. Two Riccati formulae based on 8 operator is deduced. The H2 problems for continuous time systems, Z operator models and 8 operator models are investigated respectively.The guaranteed cost control problem of robust stabilization and robust performance for uncertain systems which is described by 8 operator is discussed in this paper.

采用Riccati方程处理方法讨论了基于Delta算子描述下的离散系统存在输出反馈控制器的问题，得到了两个基于Delta算子的Riccati方程，设计了Delta域的输出反馈控制器，使得闭环系统内稳定，且满足从w到z的传递矩阵T_的H_2范数最小，设计了基于Delta算子描述下的离散系统的最优控制器，并与S域和Z域的H_2控制器进行了比较。

In this thesis, beginning with the research of the Yellow River delta formation history, the landscape heterogeneity is related with the delta evolution. According to different dynamic environments, the Yellow River delta landscape is divided into three zones: delta plain landscape, tidal zone landscape and submerged delta landscape, and the landscape characters of each zone is analyzed and discussed respectively.

本文从黄河三角洲的形成和发育研究入手，将黄河三角洲的形成与演化与景观分异联系起来，根据动力因素的差异提出黄河三角洲景观的三带结构，即：陆上三角洲景观、潮间带景观和水下景观，就三个带的景观特征分别进行了比较深入的分析和探讨。

Delta, the main types of fan-shaped delta, a bird-shaped feet and pointed Delta Delta.

三角洲的主要类型有扇形三角洲、鸟足形三角洲和尖形三角洲。

The rate of subsidence has been decreasing from area near vertex of delta to the coastal zone and some place is even rising, particularly in the early formed area. What is the different in the coastal is that the rate of subsidence is still high and can sustain a long time. This is because the land subsidence in the delta is mainly caused by the consolidation of sediments if there is no human activity. Especially in the newly formed area, Qingshuigou sub-delta, the rate of subsidence was more than 50 mm/a in the begining and now is still higher than 10 mm/a. When the newly sediments discharged by the Yellow River landed on the subaquatic delta, its load can drive the concolidation of the silt, which is on the surface of the Bohai seafloor. The rate of consolidation of the silt will be decreasing quickly in the first years, but still a long time in the later time with a slow rate.

研究结果表明：现代黄河三角洲在以宁海为顶点的河口扇形区域，近期均经历了不同程度的地表下沉过程，但是随区域地理位置和时间的不同，地表变化空间差异性比较明显；三角洲顶点附近区域的下沉速率自上世纪末开始逐渐减小，后期甚至出现轻微的抬升；滨海沿岸附近地区的地表形变特征相对比较复杂，各期叶瓣相互叠置及其各类沉积物的不均匀分配，使由沉积物自然固结压实引起的地表形变具有显著的空间差异；目前，除清水沟流路叶瓣表现为快速沉降以外，其它滨海沿岸区基本上都表现为微弱的下沉。

Yangtze River Delta, inter-city railway companies李庆鸿preparatory group on the 19th in the "Third China Urban Rail Transit Summit" and disclosed that in March 2005, the State Council executive meeting examined and approved in principle "Ring Beijing-Tianjin-Hebei Bohai Sea region, the Yangtze River Delta, the Pearl River Delta region inter-city rail transit network planning "(2005-2020), as a symbol of the Yangtze River Delta inter-city rail transit construction started.

长江三角洲城际铁路公司筹备组李庆鸿19日在"第三次中国城市轨道交通首脑会议"，并透露，在2005年3月，国务院常务会议审议并原则上批准了"环京津冀环渤海地区，长江三角洲，珠江三角洲地区城际轨道交通网规划"（ 2005-2020年），作为一个象征，长江三角洲城际轨道交通动工。

In addition, the computational evaluations indicate that the heat transfer enhancement of delta winglet for aligned tube bank heat exchanger is more significant than that for staggered tube bank heat exchanger, the heat transfer enhancement of delta winglet with the attack angle of 45° is more obvious than that of 30°; the delta winglet with the attack angle of 45° leads to an increase in pressure drop, while the delta winglet with the attack angle of 30° results in a slight decrease.

另外计算还发现：三角形小翼对顺排换热器的强化换热效果好于对叉排换热器的强化；冲角为45°的三角形小翼强化换热效果好于冲角为30°的三角形小翼；冲角为45°的三角形小翼导致空气压降提高，而冲角为30°的三角形小翼则可使压降有所减小。

The main peaks of the EEG power spectra were in delta and theta frequency range. In the stage of ethanol exposure, the rats exhibited much more act of attack than the control, the alpha waves of EEG decreased, while the delta waves increased. The EEG power spectra analysis showed the delta power increased and the theta power decreased. In the stage of ethanol withdrawal, the rats showed some withdrawal behaviors such as wet dog shakes, sniffing, groomingand tonic-clonic seizures for audiogenic stimulus. Spikes and spike-slow waves were found in the EEG. In power spectra analysis, the delta power decreased while the alpha and the theta power increased, the EEG frequency band moved to the high-frequency rang. These changes were found obviously on the sixth day and disappeared on the 1 Oth day after the ethanol was removed.

本研究发现：1、对照组大鼠行为无异常，伏核EEG以α节律为主，散在出现δ和θ节律；功率主峰在δ和θ频段范围，整个过程中未发现手术对伏核EEG及脑电功率谱有影响。2、在慢性饮酒过程中，大鼠攻击性行为增加，伏核 EEG的α节律明显减少，散在出现的高幅慢活动δ波逐渐增多，功率谱分析表明δ频段功率百分比明显增加，而θ频段功率百分比明显减少，总功率减少。3、停饮后，大鼠出现湿狗样抖动、打喷嚏等撤药综合症，并且高频声音刺激能引发惊厥；伏核EEG出现棘波和棘慢综合波，并持续增多，功率谱分析显示δ频段功率百分比 5 南京医科大学硕士学位论文逐渐减少，而0和以频段功率百分比逐渐增加，总功率增加。

ABSTRACT The Yellow River delta located in the land and sea interaction zone and is being formed with the coaction of the River and Bohai sea. The three parts of the whole delta, i. e. the delta plain, tidal zone and submerged delta, are in different dynamic environments. The delta plain is controlled by the land surface processes. The tidal zone is under the coaction of the river and the sea.

黄河三角洲处于海陆交错地带，是河流与海洋因素共同作用的堆积体，从陆上三角洲平原到潮间带直至水下三角洲受不同动力因素的作用，陆上三角洲平原主要受陆地表层过程的影响；潮间带受陆、海动力的共同作用，而水下三角洲主要受海洋动力的作用。

In this paper, the characteristics of reservoir of reservoir of delta frontal sub-faces of PI Formation in the south of Xingshugang are studied with the data of dense well pattern and rock-mineral identification. The delta frontal sub-faces can be divided into lobate delta frontal sub-faces, branched delta frontal sub- faces and sheeted delta frontal sub-faces. The genetic types of sand bodies in different sedimentary envivonments are analyzed in detail, and the distribution and space-matching relationship of different sand bodies are studied. The micro-pore structure type is studied on the base of the thin section analysis, so the reservoir heterogeneity is studied including plane heterogeneity, interlayer heterogeneity, in-layer heterogeneity and microcosmic characteristic.

利用密井网、岩矿鉴定等资料对杏南地区葡I油层组前缘亚相储层进行研究，将三角洲前缘细分为枝状、朵状、席状3种类型，详细分析了不同沉积环境下砂体的成因类型，描述了不同类型砂体在平面上、空间上的展布特征和组合关系，不同砂体内部性质的差异以及砂体内部微观孔隙结构的类型和分布特征，从平面、层间、层内以及微观特征等方面研究了三角洲前缘储层的非均质性。

During the paleo-geography evolution, inland lacustrine basin began to form, and the two delta skirt in east and west lakeshore are primary formed in Chang 10, lacustrine basin subsidized quickly, lake district enlarged rapidly and destructive delta are developed in Chang 9, delta are more developed in Chang 8, lakeshore line move outward at large range, turbidite developed well near west lakeshore, delta range is decreased in east lakeshore in Chang 7, features of lacustrine basin are changed remarkably, deep lake and half deep lake area is decreased greatly, while delta sedimentary system is developed at its most in Chang 6, framewok is inherited better, but delta′s construction is slowed and is swamping at large scale in Chang 4+5, lacustrine basin began to be silting, shrinking and dying out, and riverway gradually developed well since Chang 3, distributary riverway developed best in Chang 2, because of imbalance subsidence, subsidence center is formed in east Zichang area and in which lacustrine turbidite is sedimented.

在古地理演化过程中，长10期内陆湖盆开始形成，东西两岸两大三角洲裙初步形成；长9期湖盆快速下沉，湖区迅速扩大，三角洲多为破坏性的；长8期三角洲进一步发育；长7期湖岸线大幅度向外推移，西部浊积岩发育，东部三角洲面积明显减小；长6期湖盆面貌发生了显著的变化，深湖－半深湖面积大大减少，三角洲沉积体系极为发育；长4+5期继承了长6的沉积格局，三角洲建设进程减慢，三角洲大面积沼泽化；从长3期湖盆开始逐步淤浅、萎缩、消亡，河道逐渐发育；长2期分流河道发育；长1期由于差异沉降，在东部子长一带形成沉降中心，沉积了湖相浊积岩。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。