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But, in the natural and artificial signal, a lot of signal phases don\'tvary linearly with time, for example, we usually use chirp signal in the radar technology,frequency step signal, linear modulation component of the ground echo in the SARtechnology, linear modulation component of the moving target echo, linear modulationcomponent while the airborn radar detecting the moving target, etc.

在自然界和人工信号中,许多信号的相位变化并不是随时间一次方变化,如雷达技术中常用的线性调频信号,频率步进信号,另外,SAR 技术中,地面回波所含有的线性调频分量,ISAR技术中,运动目标的回波所含有的线性调频分量,机载雷达探测运动目标时的线性调频分量,等等;傅里叶变换对此类信号分析所得的结果是信号在不同频率点上的能量分布,即信号在基函数上的投影。

The presence of early CT signs has been reported to be a predictive sign of hemorrhagic complications after reperfusion therapies[4, 5, 13 18]. Our study has also demonstrated that the rate of symptomatic hemorrhagic complications showed a tendency to increase as the grade of early CT signs increased, although a statically significant difference was not proved. A grade III CT sign may be a predictive sign for hemorrhagic complications after reperfusion therapy. In contrast, the presence of a grade I CT sign may not contraindicate reperfusion therapy.

本研究也显示:尽管彼此间均无统计学显著差异,但血管内再通治疗后症状性出血并发症的发生率,在深部大脑中动脉分布区未出现早期CT征象的患者、出现I级早期CT征象(细微低密度区局限于岛叶,基底节区正常)的患者、出现II级早期CT征象(部分壳核后外侧区出现低密度)的患者、出现III级早期CT征象(整个豆状核区均出现低密度)的患者中,呈逐渐增加的趋势。

To disease resistance, SP3 (from H1) had stronger ability to resist leaf mold. 4.The characters obtained by space mutation were easier to be stable. The results showed that, the differences of the flowering dates of 1st inflorescence, the positions of 1st inflorescence, number of leaves between 1st and 2nd inflorescences in the colony were decreased with the development of generations. Most of these heritable characters could be stable in SP3 and a few could be stable in SP4, 2~3 generations earlier than that of traditional breeding (The characters were stable in 6 generations.).

试验结果表明,植株的第一花序开花期、植株的第一花序节位、第一至第二花序间隔叶数及产量的株间变异(变幅、标准差和变异系数),随着世代的递增而降低,大部分株系的变异性状从SP3后就稳定遗传,少数株系的变异性状从SP4后才稳定遗传,比一般常规育种的6个世代开始稳定,可提早2~3个世代,经地面定向选择能较快选出综合性状优良的目标株系。

Then ,singing among the savage branches ,it impales itself upon the longest,sharpest spine.And,dying ,it rises above its own agony to outcarol the lark and the nightinggale.One superlative song,existence the price.But the whole world stills to listen,and God in his heaven smiles.For the best is only bought at the cost of great pain...

然后在那些纵横交错的树枝间歌唱,最长最锋利的叶针把鸟刺穿,它死了,它用歌唱去表达那些超越自我的痛苦,它的歌声胜于百灵和夜莺,一首最动听的歌曲,只是存在时才会有它的价值,但是全世界仍然在聆听,上帝在天堂露出微笑,只有最痛苦的付出才能有最好的收获。

Such plants usually have one or more domatia, cavities in stems, leaves or roods that house ants. These may be elaborate systems of cavities with many chambers, e.g. Myrmecodia, or simple hollows in internodes, leaf veins, petioles or stipular spines, e.g. whistling thorns.

这类植物通常都具有一个或多个虫菌穴,虫菌穴是在植株的根、茎、叶上用来容纳蚂蚁的空腔,这些空腔具有许多发达的小室,例如茜草科具有简单而中空的结间部,阿拉比卡咖啡具有含有空腔的叶脉,有的植物叶柄及托叶处也有这样的结构,例如牛角刺槐。

Variety widely cultivated in south China,were studied by foliar 1.5 g L-1 CCC application after pot planting virus-free plantlets at the stage of budding.It was found that at the stage of tuber bulking,spraying CCC plays a prominent regulating role in the photosynthesis of Zhongshu 3.The net photosynthetic rate,stomatic conductance,intercellular CO2 concentration and transpiration rate of leaves were superior to those of the control.CCC markedly increased the contents of chlorophyll and carotenoid.CCC significantly increased the leaf photosynthetic productivity and improved economic yield.

品种广泛种植,在中国南方,研究了叶面肥1.5克升- 1 CCC认证申请后,盆栽种植无病毒的植株在阶段budding.it被发现,在阶段的块茎膨胀,喷涂中华基督教会扮演一个突出的调节作用,在光合作用的中枢三,净光合速率( 1 ),气孔导度的,胞间CO2浓度和蒸腾速率的叶片均优于那些该control.ccc显着增加的内容,叶绿素和carotenoid.ccc显着增加叶片光合生产力,以及改善经济产量。

The crystallization behavior of polyethylene terephthalate ; random poly (ethylene/tetramethylene terephthalate) P (ET/BT ; poly (ethylene terephthalate/ isophthalate) P (ET/EI and poly (ethylene terephthalate/adipate) P (ET/EA copolyesters; and block polyethylene terephthalate/polyethylene glycol and polyethylene terephthalate/polytetramethylene glycol were studied by DLI ; DSC; WAXD; PLM and IR technique.

中文题名PET及其共聚酯的结晶行为副题名外文题名 The crystallization behavior of PET and its copolyesters 论文作者边界导师封麟先叶胜荣教授学科专业高分子化学与物理研究领域\研究方向学位级别博士学位授予单位浙江大学学位授予日期2001 论文页码总数10,159页关键词聚对苯甲酸乙二酯聚酯结晶馆藏号BSLW /2003 /O633 /1 本文通过缩聚反应合成了不同分子量的聚对苯二甲酸乙二酯;聚对苯二甲酸酯P(ET/BT、聚(对苯二甲酸/间苯二甲酸)乙二醇酯P(ET/EI和聚乙二醇酯P(ET/EA等系列的无规共聚酯以及PET/PBG和PET/PEG等系列的嵌段共聚酯,并采用DLI、DSC、WAXD、IR和NMR等实验技术着重研究了它们的结晶行为与共聚酯的序列结构。

The results showed that the calorific values of the test plant species had no unified change pattern, which was possibly related to the partitioning ratio of calorific value in different plant organs and the timing when the reproductive period appeared. In general, spike had a higher calorific value than leaf and stem, and aquatic plants had obviously lower calorific value than mesophytes and wet mesophytes. Within a species, the change pattern of calorific value had certain relations to the phenophase, with approximately two lowest values and two highest values. Among the species, the differences in the calorific value were decided by the nature of the species themselves. Under the same habitat and climatic conditions, the species that contained more materials rich in energy could more easily accumulate calorific, and thus, more adaptable to grow under this environment.

结果表明:各物种的热值动态变化规律并不是统一的,这种变化可能与植物各器官热值的变化及生殖期出现的时间有关;各植物器官的热值普遍表现出穗的热值大于茎和叶;水生植物的热值明显小于中生性和湿中生性植物;种内热值变化随物候期变化有一定的规律,大约会出现2次低值、2次高值;种间热值差异是由于植物本身性质决定的,在相同生境和气候条件下,植物体中含能物质越多,就越易积聚热值,从而更适宜生长在此环境。

Culm sheaths deciduous, narrowly triangular-rounded, 1/2–3/5 as long as internodes, thinly leathery, radially white-gray setose, longitudinal ribs conspicuous, margins densely ciliate; auricles and oral setae absent; ligule arcuate or nearly truncate, 0.5–1 mm; blade erect, triangular to linear-triangular, width nearly equal to apex of culm sheath.

脱落,狭三角形绕行的竿箨,节间,薄革质的1/2-3/5倍于,显眼的白色灰色具刚毛,长度肋骨,纤毛的边缘密的光线;叶耳和口头的刚毛无;叶舌弧曲的或近截形,0.5-1毫米;叶片直立,三角形到线形三角形,宽度差不多等于竿箨的先端。

The cultural characteristics between hypovirulent strain and high virulent strain was highly distinct.The pathogen of banana anthracnose latents on fruit, foliage, bract, blossom and stalk, stalk of plants with this disease is the most important carrier. The infection type of bannana fruit anthracnose is latent infection.

在香蕉果皮、叶、苞片、花器及假茎上均有香蕉炭疽病菌潜伏,假茎的病残体带菌率最高,为主要的侵染来源;采后香蕉果实上炭疽病侵染型为潜伏侵染型;开花后20d 的香蕉果实开始带菌,随时间延长,带菌量逐渐增加,以后各个生长阶段的带菌率与降雨量有关;炭疽病菌在果指不同部位的分布存在差异。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力