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The calculation shows that with air-breathing propulsion, the maximum velocity is limited.

计算分析发现:空气呼吸模式推进飞行器的最大速度有限;烧蚀模式可以使飞行器产生很高的速度,提高冲量耦合系数和比冲,有利于提高飞行器的最高速度;两种模式相结合的推进方式提高了有效载荷比,但能源利用效率比烧蚀模式要低。

The works in the project just done can be summarized as five respects.(1) A device was designed to fabricate the asymmetrical resonant cavities by a pendant drop. A series ARCs with variable parameters provides a valuable experimental method for investigating the characteristics of ARCs.(2) The relationship between the number of active modes and the shape parameters in an ARC was investigated. The experimental lasing threshold was compared with theoretical result, the good agreement between two shown that it was the decrease of the number of active modes in an ARC that decreased lasing threshold.(3) Dye lasing gain was used to enhance the signals of stimulated Raman scattering of the weak gain Raman modes in a circular cavity made by a pendant drop, the instantaneous SRS spectra of weak gain Raman modes in ethanol was obtained by this new method.(4) The SRS signals of minority compound in a binary chemical complex was obtained by using dye lasing gain method. The detection concentration of minority compound was reduced to an order compared with normal SRS method.(5) A cylindrical circular cavity was formed by a liquid jet, which was used to reduce the pump intensity required for laser induced plasma spectroscopy. The limit of detection of trace element in aqueous sample was greatly decreased by this new method.

我们设计并成功制作了使悬垂液滴连续变形的装置,用此装置可以方便地改变非圆对称谐振腔的几何参数,为ARCs的研究提供了一种有效的实验方法;研究了ARCs中活性模式数和变形参数间的变化规律,激光阈值的数值计算结果和激光辐射的实验结果作了比较,二者吻合的曲线说明ARCs中活性模式数量的减少是受激辐射放大阈值降低的原因;在由单元化合物构成的微型圆对称谐振腔中,首次尝试用"激光增益"增强弱增益拉曼模式的受激拉曼散射信号,获得了乙醇分子中弱增益拉曼模式的瞬态SRS光谱;在由二元混合物构成的微型圆对称谐振腔中,用染料的激光增益增强了少量化合物的SRS信号,把少量化合物的SRS信号探测浓度降低了近一个数量级,在SRS应用于瞬态过程的组份分析方面做了卓有成效的探索;用石英毛细管形成的稳定液拄构成拄形谐振腔,降低了激光诱导等离子体光谱需要的激励能量,有效地降低了水相样品的痕量元素分析极限,为LIPS应用于微量元素的化学分析开拓了一条新的技术路线。

The author analysis the inherent link between the circular economy and the adjustment of the industrial structure, then adjust the industrial structure through transforming the value chain at the micro-enterprise level and building eco-industrial park at the meso-level based on the micro, meso and macro levels of the circular economy. All the transformation is to promote the development of circular economy and to change China's economic development model. Doing this, we want to change the traditional products economic

本文从系统的角度,分析发展循环经济与产业结构调整之间的内在联系,以循环经济发展的微观、中观、宏观三个层次为基础,通过微观企业层面上改造价值链和中观层面上构建生态工业园来调整产业结构,推进循环经济发展,改变我国的经济发展模式,使我国从传统的产品经济模式,向资源经济模式转换,进而实现循环经济在整个社会层面上的大循环,从而找到在全社会建立一种以循环经济发展模式为核心的可持续发展的社会-经济系统的具体实践。

The main contribution of this paper is finding two basic commercial patterns: focusing on product and focusing on costumer, and gives five approaches to realize them.

指出,国有外贸企业的发展方向有两种商业模式:"以产品为中心"和"以客户为中心",并对这两种商业模式给出了五种实现途径。

On this basis a design scheme of the database for SCADA based on the component object model is presented, in which the content and background of IEC 61970 standard is introduced first, then some different component model are assayed , then a design scheme of the database for SCADA based on the component object model is presented, the foreground application of SCADA is connected with the database by components.The new model have some advantages: system have disrelation with develop language ,the peculiarity of COM make the system fit in with different apply program developed with different language;(2) the system can be modified and upgraded easily by means of upgrading the component modules;(3) the system can be enlarged easily by means of adding the new component modules without quiet amendment in old system.

为此,本文介绍了一种基于组件对象模型的SCADA数据库系统设计方案,文中首先介绍了IEC61970标准的内容及产生背景,分析了几种不同的组件模型,在此基础上,提出了一种基于COM组件技术的SCADA数据库设计及访问模式,在此模式下根据SCADA数据库不同的功用划分了不同的组件模块,利用组件连接数据库与SCADA前台应用,基于组件技术的SCADA数据库设计有以下一些特点:(1)与语言无关性,COM的特性决定了此系统上可以应用不同语言开发的应用程序;(2)系统易修改及维护,用户可以通过更新组件模块的方式修改及维护系统;(3)系统易扩展新的功能,用户可以通过开发新的组件方式将新的应用与原系统结合,而不用对原系统做很大的修改。

For example, we have conducted the sequence screening on the binding sites of the interface of Barnase/Barstar complex and found that our DGA method can not only determine which position is more conservative and more important, but also redesign the binding sites rationally. The random sequence design for α,β,α/β and α+β four folding motifs have also been practiced and revealed that there are both homology evolution and heterology evolution of protein sequences compatible the same backbone motif.

例如,通过对典型的Barnase/Barstar复合物界面研究发现,它可以确定界面结合位点的重要性和保守性,并对结合位点进行合理的序列重新设计;通过对α、β、α/β、α+β等四种折叠模式骨架的随机序列设计,发现在蛋白质进化过程中,对同一种结构模式同时存在序列的同源进化和非同源进化这两种趋势。

Microeconomic behavior has type of two kinds of research model: One kind is the egocentric mode that sets out from the hoggish sex of individual action, one kind is the altruism mode that sets out from the altruistic sex of individual action.

个体经济行为有两种研究范式:一种是从个体行为的利己性出发的利己主义模式,一种是从个体行为的利他性出发的利他主义模式。

There are two VPRN implementing mechanisms: piggybacking mode and overlay mode.

现阶段有两种实现VPRN的机制:一种是集成模式;另一种是叠加模式。

As feature extraction acts an important role in pattern recognition system, we propose three novel feature extraction methods for HCCR: a、Two structural feature extraction methods, Stroke Cross Counting Features and Peripheral Features are studied. According to the characteristics of Chinese handwriting samples, we extend the SCCF and PF respectively to weighted elastic SCCF and weighted elastic PF. Experiments show that the modified feature extraction approaches are better than original approaches. b、A new statistical feature extraction method——Elastic Meshing Directional Decomposition Feature extraction is proposed. According to the stroke statistical properties of Chinese character, we first decompose a handwritten character pattern into four directional subpatterns. Then a set of elastic meshes are applied to each of the four subpatterns respectively to extract the pixel distribution features.

统计识别方法:利用统计模式识别的经典方法——Bayes分类方法来进行汉字识别的研究,特征提取是统计模式识别的关键,本文着重围绕手写体汉字的特征分析和提取方法进行了研究,提出了三种特征提取的新方法: a、两种改进的结构特征提取方法:在笔划密度特征和外围特征的基础上,结合手写体汉字的特点,提出了加权非均匀笔划密度特征、加权非均匀外围特征的特征提取新方案; b、一种新的统计特征提取方法——弹性网格方向分解特征,根据汉字方块字的特点及笔划分布的统计特征,对手写体汉字进行横竖撇捺四方向的分解,并利用一系列的弹性网格对汉字分解后各分量的象素进行统计而提取特征,实验证明该特征提取方法用来进行手写体汉字识别是十分可行和有效的。

Smilax, there are the phylogenetic relationships and distributive pattern to be found based on the combined ITS and maiK. tree: 1 a clade with the African species (S. kraussiana) and Australian species (S. australis), being a sister group; 2 a clade with the S. zeylanica of sect. Macranthae and S. bona-nox of sect. China, the former from Southeast Asia and latter native to US, showing they are a sister species which is disjunctive between Asia-North America, similar to the species pair of S. hispida and S. sieboldii; 3 S. perfoliata from Indonesia being sister to S. ocreata of China and S. megacarpa of Indonesia, which are very similar to each other in morphology; 4 the three species from China (S. lanceifolia, S. perfoliata and S. chapaensis) and S.ovalifolia from Indonesia showing a 87-92% bts monophyletic clade; 5 S.bracteata from China and two species of Indonesia (S. leucophylla and S. sp.) forming a clade in the ITS tree; 6 S.

通过比较研究圆锥花序组和穗菝葜组的地理分布,基于ITS及matK联合数据构建的系统树发现下列明显的具系统发育关系的类群及地理分布模式:1来自非洲的S.kraussiana和来自澳大利亚的S.australis是一对姐妹群,具有共同的祖先;2圆锥花序组的S.zeylanica和菝葜组的S.bona-nox形成一个紧密的分支,前者分布于东亚而后者只局限于美国,显示了一种类似于S.sieboldii和S.hispida那样的东亚—北美间断分布模式;3印度尼西亚的S.perfoliata是分布于中国的S.ocreata和来自印尼S.megacarpa的姐妹群,这三者在形态上也非常接近,表明具有共同祖先;4来自中国的三个种(S.lanceifolia,S.perfoliata and S.chapanensis)和来自印尼的S.ovalifolia形成了一个高支持率的单系分支(87-92%bts);5基于ITS的系统树,来自中国的S.bracteata和来自印度尼西亚的两个种S.leucophylla and S.sp。

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推荐网络例句

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特,那个是爱朗。

Articulate the aims, objectives and key aspects of a strategic business plan.

明确的宗旨,目标和重点战略业务计划。