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Secondly, the platform of IPTV set-top box named DM6446 is introduced, and then the AVS video coding standard which is implemented as the video coding standard of IPTV is introduced. The kernel architecture, peripheral devices of DM6446 and the key technique of AVS video coding such as transformation, quantization, intra-prediction, inter-prediction, interpolation, and loop filter is introduced in detail. Thirdly, the system procedures of set-top box which are implemented on the ARM side of DM6446 are introduced in detail. This part focuses on the demultiplex of audio and video data, the design of data interface, the playback of audio and video, and the communication between ARM and DSP. Fourthly, the loop filter algorithm of AVS video coding standard is introduced in full detail, and the optimized procedures of the algorithm on the DSP side of DM6446 are introduced, and then the optimized results are presented. Fifthly, the thesis introduces and analyzes the state-of-art technique of deblocking filter, and proposes a deblocking method, and then the results of proposed method are given. Finally, summarize of this thesis and further development is given.
首先对IPTV技术、视频编解码技术以及去块滤波技术做了简要介绍;然后介绍了IPTV机顶盒的实现平台DM6446,并介绍了该处理器的外围接口和内核结构,同时介绍了作为本IPTV系统视频标准的AVS第二部分视频标准,以及该标准中变换量化、帧内预测、帧间预测、插值和环路滤波等多个模块的算法;接着,详细介绍了机顶盒系统相应程序在DM6446 ARM核上的实现,重点介绍了音视频系统码流的解复用、数据接口设计、音视频的播放以及ARM核与DSP核之间的通信;然后,详细介绍了AVS视频标准中环路滤波算法及该算法在DM6446 C64+内核上的优化,并给出优化结果;然后对去块滤波算法进行了研究并提出了一种环路滤波方案,同时给出了此方案的实验结果;最后总结了本文的工作,并提出了可以改进的方向。
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This paper studies the main geometrical parameter such as angle, height, width, stagger and the upper width in dentation and trapezoid flow path, firstly, uses the single-phase numerical simulation of the computational fluid dynamics technique to analyse the influence of different geometrical parameter on discharge coefficient and flow state exponent of drip emitter. Secondly, uses the two-phases numerical simulation of CFD (1% sand content ) to analyse the influence of the above mentioned geometrical parameter on the contribution regulation of sand and anti-clogging performance. Thirdly, uses the PIV ( particle Tracking Velocimetry ) technique which can see the small-scale flow path to observe and test the trajectories and velocities of solid particles in labyrinth flow path, and analyses the basic factors which can influence the movement characteristic of solid particles and the flow state in flow path.
本文以齿形流道、梯形流道为主要研究对象,以流道转角、流道高,流道宽、偏差量及梯形流道上底宽为主要结构参数,首先应用 CFD 单相流数值模拟技术对不同结构参数灌水器流道水力性能进行模拟,分析了不同结构参数对流态指数和流量系数的影响,其次,应用 CFD 两相流(含沙量为1%)数值模拟技术分析了结构参数对含沙量分布规律和抗堵塞性能的影响,然后,应用 PIV 可视化测试方法测试了固体颗粒在流道内运行轨迹及速度,分析了影响固体颗粒运动特性及流道内流体流态的基本因素,最后,对上述流道结构形式通过模具加工及滴灌带试制,进行了标准化测试( GB/T 17187-1997 农业灌溉设备滴头技术规范和试验方法与 ISO 标准 ISO /TC23 /SC18 /WG5N4短周期堵塞测试程序),测试结果验证了 CFD 模拟结果,并提出了迷宫结构流道灌水器的抗堵塞设计方法。
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A rotary separator of vacuum cleaner is composed of a dust collecting container, an opening-closing cover, and a separating plate dividing the dust collecting container into upper space and lower dust collecting chamber.
本发明属于一种真空吸尘器用的旋转分离装置,包括含有异物的空气流入其内形成螺旋流的集尘箱,可开闭集尘箱的盖,集尘箱内设有分离板,分离板与集尘箱的下侧内周面严密地结合,在分离板的下部形成集尘部;分离板是中心开有开口部的圆锥状,从上面的圆周向下倾斜形成引导部,引导部的最下端有引导异物流入到上述集尘部的流入孔。
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The results indicated that the treatment of irradiation restrained the growth and differentiation of protocorm, especially to roots.The LD50 is 67.23Gy, because the protocorm is a integrate embryoids and higher tolerance was found. Ploidy analysis showed that most of aberrant seedlings go with the change of DNA and they were not euploid. When the plants trearted by irradiation, some of aberrant seedlings appeared stem forfication, and leaves appeared chlorophyll-deficient or green-white.,probably due to some genes' expression or closing.
结果表明:辐照处理对种胚原球茎的生长和分化有抑制作用,尤其是对根的抑制更为明显;由于种胚原球茎的完整性好,耐受性强,其辐照半致死剂量(LD50)为67.23Gy;流式细胞分析表明,大多数外部形态发生改变的植株其细胞内DNA的倍性发生了改变,出现相当多的非整倍体;此外,辐照产生的变异苗出现茎分叉、叶片缺绿或白绿相间等现象,可能是由于某些基因的表达与关闭引起的。
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Methods: The methods of document arrangement were used in this study, First of all, from the source of "Inner Canon of Huangdi" in the meaning of Jueni syndrome, the mechanism of the formation of Jue syndrome, Jue syndrome of the classification system described; and then flow from the source, Jueni syndrome are classified according to the difference of cold and heat, asthenia and sthenia in "Treatise on Febrile Diseases", and summarize the treatment of the different methods, Combining with the modern case that treating Jueni syndrome with Zhongjing\' prescription.
方法本课题研究采取文献整理的方法,首先从源头上对《内经》中厥逆证的含义,厥证形成的机理,厥证的分类进行了系统的阐述;然后由源及流的将《伤寒论》中论述(来源:AB68C论文网www.abclunwen.com)厥证的诸多条文,根据寒热虚实的不同,将厥逆证进行分类,总结出厥证的不同治法,并结合现代运用仲景方治疗厥逆证的验案,挖掘仲景辨治厥证的证治规律,反映仲景治疗厥证的特色。
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Deep-water carbonate sediments include allochthonous carbonate sediments released from shallow water by gravity flow and carbonate contourite arid static autochthonous deep sea carbonate sediments.
深水碳酸盐沈积包括深水重力流作用形成的异地沈积和非重力流沈积,在非重力流沈积中又有深水牵引流(等深流、内波、内潮汐等)沈积和静态原地碳酸盐沈积。
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According to yoga ,the pranamaya kosha forms the fine network through which prana flows.it is known as the pranic,etheric or bioplasmic bldy.this energy body is said to have the same shape as the physical body.however,through certain yogic techniques,concentration and visualization,te practioner is able to make it expand and contract ,especially through the technique of prana vidya.if our perception was finely attuned to the pranic body ,we would see a body of light in which there are thousands of delicate ,wire like structures conducting shakti or energy.these wire-like structures are the nadis or energy flows.the shiva samhita says that altogether there are 350,000 nadis in the body ,the prapanchasara tantra says 300,000 and the Goraksha sartaka says 72,000.there are thousands upon thousands of nadis within the substructure of the gross bosy and they distribute consciousness and prana to every atom.
根据瑜伽中说的,能量的混合形成网络,促成能量流的形成。能量、空的属性被称为是植物性神经属性的身体。能量和肉体的身体是同样的容积的。全,通过练习某些瑜伽技巧,特别是通过某些独特的呼吸方法,集中和内观,那么练习者就能够让扩大收缩强能量。如果我们能够更好的掌控能量的身体,我们就能够看见成千上万个微妙的、线状结构的光芒掌握着能量。那么SHIVA SAMHITA说在身体中总共有350,000个通道。THE PRAPANCHASARA TANTRA 说有300,000个,TEH GORAKSHA SARTAKA说有72,000个,总而言之,意识和能量就是通过这些成千上万的通道被分送到身体的每一个细胞的。
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Based on the detailed study of seismic tomography image in South China, and according to the geotectonic environment and shape and heat of asthenosphere upwelling, we divided the structure of lithosphereasthenosphere at the Mesozoic upper mantle of Eastern China into three types.(1)Continental platform area (North China platform and Yangtze platform): asthenosphere upwelled along paleorift; over the plume head, the granitic rocks of crust and mantle mixed and correspondingly, Au, Cu, Mo, PbZn, etc. mineralizationconcentrated regions were formed; and at the steep contact belt of asthenosphere and the thick area of lithosphere, mediatebasic complex was formed.(2)Central area of fold zone: asthenosphere was "recumbent" at suitable depth, with adequate heat and in a great extent; by heat conduction, the interior of partial crust remelted, and the crustsource granitic rocks, and correspondingly, W, Sn and rare elements mineralizationconcentrated regions were formed.
在深入研究华南地震层析成像的基础上,按照大地构造环境和软流圈上涌形状和热度,将中国东部中生代上地幔中岩石圈软流圈构造划分为3类:(1)陆台区,软流圈沿古裂陷上涌,其柱头上方形成幔壳混熔花岗质岩及相应Au、Cu、Mo、PbZn等矿集区,并于软流圈与岩石圈厚区之陡接触带形成中基性杂岩及相应Fe矿集区;(2)褶皱带中心区,软流圈在适当深度、热量充足、较大范围内&平卧&,因热传导而致使地壳内物质部分重熔,形成壳源型花岗质岩及相应的W、Sn、稀有元素矿集区;(3)褶皱带边缘区(大兴安岭南部及华南南缘),在软流圈上涌柱上方形成幔源或幔壳混熔的花岗质岩,相应为Cu、Au、PbZn、Mo、Ag矿集区。
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A rotary separator of vacuum cleaner is composed of a dust collecting container, an opening-closing cover, and a separating plate dividing the dust collecting container into upper space and lower dust collecting chamber.
要約 本发明属于一种真空吸尘器用的旋转分离装置,包括含有异物的空气流入其内形成螺旋流的集尘箱,可开闭集尘箱的盖,集尘箱内设有分离板,分离板与集尘箱的下侧内周面严密地结合,在分离板的下部形成集尘部;分离板是中心开有开口部的圆锥状,从上面的圆周向下倾斜形成引导部,引导部的最下端有引导异物流入到上述集尘部的流入孔。
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Cavitations is the major problems of designing water hydraulic valve, understanding the relationship between shape of valve and cavitations , avoiding cavitations is extremely important, this paper, the numerical simulation and visualization research of flow field is carried out to research relation between the flow field of poppet valve and the length of valve seat by finite volume numerical method.
气穴是研制水压阀存在的主要难题,认识阀口形状与气穴的关系,避免产生气穴现象是极其重要,本文应用有限体积数值计算方法针对阀座倒角长度变化对水压阀阀道内流场的影响进行数值模拟和可视化研究,得到了一些有益的结论:倒角长度的改变对阀口间隙以及阀芯锥面与柱面相接的地方的负压会产生比较大的影响
- 推荐网络例句
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She gently rebuff ed him, but agreed that they could be friends
她婉言拒绝了,但同意作为朋友相处。
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If in the penal farm, you were sure to be criticized.
要是在劳改农场,你等着挨绳子吧!
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Several theories about reigniting and extinguishing of the arc have been refered.
本文综合考虑了几种电弧重燃和熄灭理论。