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In the numerical study, the governing equations of flow and heat transfer in 3 —D body—fitted curvilinear coordinate system being automaticly generated with TTM method were deduced by means of vector and tensor analysis. These equations were dliscreted with nonstaggered grids providing relative elimilating method for the pressure oscillation was domonstrated.
在数值分析中,借助于矢量理论和张量分析,导出了具有普遍意义的三维任意曲线坐标系下的流动传热控制方程,并利于TTM方法生成了计算域的贴体曲线坐标网格;在数值离散过程中,尝试了用非交错网格离散的方法并解决了压力场振荡的抑制问题;运用附面层理论,阐述了壁面函数法在三维任意曲线坐标系上的应用。
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In this paper, we first give an example that the bilateral weighted shift operator in c_0space is hypercyclic operator and first solve the existence problem of hypercyclic operator in c_0or c_0(Z space . And then we investigate the property of weighted shift operator in c_0 space and an important property of the hypercyclic vector of weighted shift operator in c_0 space and c_0 space. At last we give the concept of weak hypercyclic operator and weak hypercyclic vector , and give the equivalence between the weak hypercyclicity and the hypercyclicity in l~1 space.
本文首先给出了c_0空间上的一个双边左加权移位算子是超循环算子的一个例子,首次解决了c_0 或c_0(Z 空间中超循环算子的存在性问题;接下来分别研究了c_0和c_0空间上的加权移位算子的性质以及c_0和c_0空间上的加权移位算子的超循环向量的一个重要性质,最后提出了弱超循环算子和弱超循环向量的概念,并且给出了I~1空间中弱超循环性与超循环性的等价性。
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On the basis of analyzing the characteristics of geological plane maps, the notion of the wire frame model illustrated by outline of geological blocks is proposed to describe the geometrical form of complex faults and the relationships among them.
在分析平面地质图数据特点的基础上,为准确表达复杂断层的空间几何形态和相互之间的关系,引入了由地质形体的轮廓线构建而成的线框架模型概念;修正了边界表示法模型有效构建的基本条件;从地层与断层之间的关系角度详细阐述了有效构建线框架模型的方法;提出了以线框架模型为基础的断层面整体构建技术思路,解决了复杂断层面三维构建问题。
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Everything's been settled---I've found out the place where I can play piano, I've got my own computer and Internet, my wisdom tooth has been ok temporarily, and my parents have visited me and already left.
一切都渐渐安顿好了---我已经找到了可以弹钢琴的地方,也有了自己的电脑及网路,暂时解决了智齿的问题,爸妈也来过并且离开了。
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In recent years, Yihua greatly enhanced its self-determined scientific and technological ability for innovation. It implemented over 200 items of new techniques, developed over 20 items of state-level or province-level new products, declared over 100 patents of invention and achieved over 50 items of state-level, province-level or city-level important scientific and technical achievements, among which, the YH Non-break Molding Powder Coal Gasification Technique was for the first in the world applied in mass production device of urea. Yihua%26rsquo;s Technique of Pressure-swing Decarbonization Absorber won a national gold prize for patent of invention. Its Technique of Heavy-medium Ore Beneficiation and Twice Versa Floatation successfully solved the global problem that collophanite could%26rsquo;t be used to produce DAP.
近两年,宜化开发并实施了300多项新技术新工艺,开发了20多项国家级、省级新产品,申报了200多项发明专利,取得了50多项国家、省、市级重大科技成果,具有极强的自主创新能力,其中YH粉煤连续成型气化技术成为世界第一家大规模用于尿素生产的装置;变压吸附脱碳获得了国家发明专利金奖;重介质选矿和双反浮选技术成功地解决了胶磷矿不能生产磷酸二铵的世界难题。
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The junction technique of composite plastic pipe was researched, and the application of electrofusion welding in junction technique was discussed in detail.
对复合塑料管的连接技术进行了研究,尤其对连接技术中电熔熔接的应用做了详细的论述,提出了电熔熔接时恒压及动态过程控制的方法和控制的参数,推导出了电熔熔接电压的计算公式,有效解决了接头连接施工中存在的问题。
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By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.
在窄带条件下,GSC-SSF方法还可以提高阵列的虚拟孔径,从而提高估计的性能;可以证明,Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似; 3、提出了二维GSC-SSF方法和宽带谱相关DOA矩阵方法,利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题,并具有阵元数少、计算量较小的特点; 4、提出了时频子空间拟合和宽带时频DOA估计算法,将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中,利用时变滤波实现信号选择性测向和干扰抑制,特别适合于谱时变信号;可以证明传统特征结构法可看作是时频子空间拟合方法的特例; 5、提出了多用户环境下阵列响应的估计方法——CARE方法,该方法对信号结构和传播参数(主要是散射源分布与角度散布)的约束较少,适用于各种几何结构的阵列甚至未校准的阵列,能够直接得到阵列响应的闭式解,因此计算量小、稳健性好,不存在收敛问题; 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案,通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束,并保证各波束内的用户信号各不相同且相互干扰最小;其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点,其有效性已得到外场实测数据的证实。
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The digital map input and maintenance subsystem performs format conversion,editing and updating of spatial data;the rail-track video playing subsystem uses video recording as reference data,then plays,inquires and traces the corresponding frames in synchronous to the scaled mileage,realizing the query of the active picture frames;the digital map query subsystem fulfills the map query,preview and spelling of digital map orthograph.
其中,地形图输入与维护实现了数字地图的格式转换、编辑处理以及空间数据的更新操作,解决了不同格式空间数据的互相转换问题;线路录象播放将线路录像数据作为系统的一种索引数据,活动影像的画面与里程相对应,实现了基于线路录像的播放、查询和检索的功能,实现了基于活动画面的查询检索功能;数字地图子系统完成了图形查询、数字地图与线路正射图像浏览、图幅拼接等功能。
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As a result, for feed-forward NN model this paper first proposes the concepts of"attractor"and"attraction region","fake attractor"and"fake attraction region", and norm of describing"attraction region". Further this paper presents a mathematics method of calculating feed-forward NN"attraction region", it solves the overelaborate job of checking NN fault-tolerance performance by testing all detecting samples, so to test fault-tolerance performance using theoretic characteristic norm is an important break. In accordance with feed-forward NN low fault-tolerance and difficult to satisfy practical application, according to practical application theory, this paper presents an actual method of enhancing NN fault-tolerance performance, builds the mechanism of reconstructing NN model based on combining NN and fuzzy process, reforms NN "fake attractor"and"fake attraction region"to enhance NN fault-tolerance performance greatly.
为此,本文首先给出了前馈NN模型的&吸引子&和&吸引域&,&伪吸引子&和&伪吸引域&的定义,以及描述吸引域的指标,在此基础上提出了一种计算前馈NN模型&吸引域&大小的数学计算方法,该方法提出解决了目前依靠对检测样本的测试工作来检验NN容错性的繁琐工作,而用具理论意义的性能指标来检验,这是一个重要的突破;针对前馈NN容错性较低以致难于满足实用的缺点,根据NN实用稳定性理论,提出了一种提高其容错性的实用方法,建立了基于NN与模糊处理相结合的NN模型重构机制,重构NN&伪吸引子&和&伪吸引域&来大大地提高NN的容错性。
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To use the well-developed inspection technology, two problems are solved. First, a crank-rocker mechanism is designed to put up and down the probe; and then an output interface equipment is built, which enables the operator observe the measurement results on time, by the communication between the pachometer and the output interface equipment.
考虑利用已成形的测厚技术,本文主要解决了两方面问题:机械上设计了曲柄摇杆机构实现了测厚探头的自动抬放;通过设计输出接口显示装置,利用它与测厚仪之间的通讯实现了测量数据的远距离传输,保证了操作者可实时观测到测量数据。
- 推荐网络例句
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Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).
呼气,收缩臀部肌肉;拱起身体,尽量抬起头来,右腿伸直朝向天花板(膝微屈,以避免肌肉紧张)。
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The cost of moving grain food products was unchanged from May, but year over year are up 8%.
粮食产品的运输费用与5月份相比没有变化,但却比去年同期高8%。
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However, to get a true quote, you will need to provide detailed personal and financial information.
然而,要让一个真正的引用,你需要提供详细的个人和财务信息。