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The main achievements of the project are as follows: 1 the hypothesis that a decrease in seed mass causes an increase in mean dispersal distance has been tested based on the experiments of weed dispersal by wind. The experimental results partly support the hypothesis. The results will help farmers to make an optimal strategy of weed control; 2 a statistic method for inferring probabilistic distribution function of a random variable has been developed, by which probabilistic distribution functions of weed species dispersal have been determined; 3 the reproduction structure of Bromus sterilis has been studied; 4 a more complex CA model with 25 neighborhood cells were built, which can simulate spread of a weed population. This work promotes developments in both theory and application of CA models; 5 the "mean law" in weed control has been proposed. Accordingly, the algorism of patch spring may be calibrated; 6 the "patch" and "true patch" have been mathematically defined so that herbicide can be efficiently applied; 7 simulation validates that initial configurations of weed will affect dispersal of its population and strategies of controlling it, or its distribution patterns affect its dispersal progresses.

主要完成的工作和取得的成果有:1)用实验证实了重量较轻的杂草种子并不一定飞得比较重的远,其结果有助于农民制订杂草的优化控制策略;2)发展了一种推断随机变量分布函数的统计方法并用它来获得了几个杂草种的扩散分布函数;3)对杂草Bromus sterilis的繁殖结构进行了研究;4)建立了一个具有25邻的较复杂的能模拟杂草扩散的CA模型,并在理论和应用方面促进了CA模型的发展;5)在杂草控制方面提出了&平均法则&,据此可对按块施药方法进行校正;6)精确地定义了&块&和&真块&以便在杂草控制中能更有效地使用除草剂;7)模拟证实杂草种群的初始配置影响其扩散和控制策略,或者格局影响过程。

M/s. The following dimensionless relationships were obtained: Sh=2+0.073Re〓Sc〓〓〓 The desulphurization process by powder injection and blowing in RH refining of molten steel and its mechanism have been considered and analyzed. Based on the tworesistance mass transfer theory and the mass balance of sulphur in the system, a kinetic model for the process has been developed. The related parameters of the model have been reasonably determined. Modeling and calculations for the process by injecting and blowing the lime based powder flux under the assumed operating modes in a RH degasser of 300t capacity have been carried out using the model.

考虑颗粒与液流的相对速度,RH—PTB条件下熔池传质特性可由下式表征: Sh=2+0.073Re〓Sc〓考虑紊流中脉动速度引起的能量耗散,RH—PTB条件下熔池传质过程服从如下关系:〓将粉剂颗粒与钢液间的传质当作刚性的气泡与钢液间的传质处理,对RH—PTB过程有:〓考察和分析了RH喷粉脱硫过程及机理,基于双重阻力传质理论和体系内硫的质量衡算,建立了RH喷粉脱硫过程的动力学模型,确定了模型各有关参数,包括各传质系数和脱硫处理过程中钢液内参与脱硫反应的粉剂量等。

Some theory problems of interaction synthesis under the conditions of interaction restrains have been investigated, the concepts and definitions of interaction controllability and interaction fixed modes have been introduced; the definition and algorithm of sluggish modes, which reflect the controllable extent of interactions, has been established; a feasibleness theorem of progressive interaction design and some other propositions have been given and proved also.

文中还对约束条件下的关连综合的理论问题进行了探讨,引进了关连可控性、关连固定模的概念和定义;提出了反映关连可控性程度的怠滞模的定义及其算法;并给出了关连逐步设计的可行性定理等命题及其证明。

Japonica. Brief speculation on the evolutionary trend of the seed-coat micromorphological features of the genus Kadsura is discussed.Cladistic principles and methods have been employed in this study. The morphological characters have been polarized for phylogenetic analysis. Cladograms have been gotten with the related genus Illicium as the outgroup. As a result, a new system of the genus Kadsura has been reconstructed.

整理有关南五味子属植物研究的资料,补充搜集整理近期发表的资料和作者研究所得的数据,采用分支系统学的原理及方法,对本属植物的形态性状进行分析,确定性状极性,以种为基本进化单元,选择近缘且原始的八角属Illicium作为外类群,采用PAUP软件,对本研究得出的性状数据作系统分析,重建南五味子属的系统发育。

In this part, the densities of sodium benzoate, sodium nitrobenzoate, sodium chlorobenzoate and sodium methylbenzoate in DMFwater mixed solvents have been measured at 298.15K with an Anton Paar Model 55 densimeter. From these densities, apparent molar volumes and partial molar volumes have been calculated, transfer volumes from water to DMF-water mixtures and substituent contributions to the transfer volumes have also been obtained. Solvent and substituent effects are discussed in detail. The Scaled Partical Theory has been applied to the ternary solutions to evaluate the partial molar volumes of cavity formation and the volumes change associated with solute-solvent interaction.

选择了含有取代基团的芳香类有机电解质,主要是苯甲酸钠、硝基苯甲酸钠、氯苯甲酸钠和甲基苯甲酸钠的邻、间、对同分异构体作为研究对象,用DMA 55型振荡管密度计测定了它们在不同质量百分数组成的DMF-水混合溶剂中的密度,利用这些密度数据,计算了表观摩尔体积和偏摩尔体积,得到了这些单取代苯甲酸钠从水到DMF-水混合溶剂中的迁移偏摩尔体积及苯环上不同位置的取代基对迁移偏摩尔体积的贡献值,讨论了溶剂效应和取代基效应,并将定标粒子理论应用于此三元电解质溶液中。

Bear the weight of history in 90 and civilized Nankai University belongs to first-rate university of in the homeland ", consent to the humanity detail being able to alter from day to day just and sound","institution of higher learning Polaris " history Smriti , Premier Zhou Enlai who reads a book for China rises abruptly and esteemed and beloved, I have been set up the ideal being admitted to Nankai from childhood by me , my height has been got 626 marks in , for a variety of reasons, have been failed to register for examination of Nankai , have been felt sincerely regretful.

承载90年历史和文明的南开大学属国内一流的综合大学,&允公允能、日新月异&的人文底蕴,&学府北辰&的历史传承,以及敬爱的为中华崛起而读书的周恩来总理,让我从小我树立了考取南开的理想,我的高考考了626分,由于种种原因未能报考南开,深感遗憾。

In this study, the methodology of linear structural rela- tionship model of latent variable has been studied which is the first time in China. Some extended conclusions have been come up to, such as multi-factor congeneric measure model, the reliability of measurable variable and its hy- pothesis test, the relation between standardized solution and unstandardized solution, multidimensional path model with measure errors, and multilevel model of latent vari- able. Some examples have been shown to help apply these results in practice, such as the analyses of the children growth-development data, the bone density data and the health resources data by means of latent variable model. Not only have new explanations for these data been achieved, but also powerful patterns for applying the theoretical methods in medical sciences and other fields.

首次系统地研究了潜在变量的线性关系模型,对部分已有的结论作了有益的推广,如:多因子度量模型、观测变量的可靠性及其假设检验、标准解与非标准解的关系、有度量误差的多维通径模型、以及多水平资料的潜变量建模;并用实例阐述了它们的具体应用,如分析了儿童发育调查资料、人体骨骼密度调查资料以及卫生资源利用效益评价资料,不仅获得了这些资料本身一些新的解释,也为本文所研究的理论方法在医学科研以及其它领域科研中的应用提供了例证,也便于广大医学工作者掌握。

I observ'd, that the two who swam, were yet more than twice as long swimming over the Creek, as the Fellow was, that fled from them: It came now very warmly upon my Thoughts, and indeed irresistibly, that now was my Time to get me a Servant, and perhaps a Companion, or Assistant; and that I was call'd plainly by Providence to save this poor Creature's Life; I immediately run down the Ladders with all possible Expedition, fetches my two Guns, for they were both but at the Foot of the Ladders, as I observ'd above; and getting up again, with the same haste, to the Top of the Hill, I cross'd toward the Sea; and having a very short Cut, and all down Hill, clapp'd my self in the way, between the Pursuers, and the Pursu'd; hallowing aloud to him that fled, who looking back, was at first perhaps as much frighted at me, as at them; but I beckon'd with my Hand to him, to come back; and in the mean time, I slowly advanc'd towards the two that follow'd; then rushing at once upon the foremost, I knock'd him down with the Stock of my Piece I was loath to fire, because 1 would not have the rest hear; though at that distance, it would not have been easily heard, and being out of Sight of the Smoke too, they wou'd not have easily known what to make of it: Having knock'd this Fellow down, the other who pursu'd with him stopp'd, as if he had been frighted; and I advanc'd a-pace towards him; but as I came nearer, I perceiv'd presently, he had a Bow and Arrow, and was fitting it to shoot at me; so I was then necessitated to shoot at him first, which I did, and kill'd him at the first Shoot; the poor Savage who fled, but had stopp'd; though he saw both his Enemies fallen, and kill'd, as he thought; yet was so frighted with the Fire, and Noise of my Piece, that he stood Stock still, and neither came forward or went backward, tho' he seem'd rather enclin'd to fly still, than to come on; I hollow'd again to him, and made Signs to come forward, which he easily understood, and came a little way, then stopp'd again, and then a little further, and stopp'd again, and I cou'd then perceive that he stood trembling, as if he had been taken Prisoner, and had just been to be kill'd, as his two Enemies were; I beckon'd him again to come to me, and gave him all the Signs of Encouragement that I could think of, and he came nearer and nearer, kneeling down every Ten or Twelve steps in token of acknowledgement for my saving his Life: I smil'd at him, and look'd pleasantly, and beckon'd to him to come still nearer; at length he came close to me, and then he kneel'd down again, kiss'd the Ground, and laid his Head upon the Ground, and taking me by the Foot, set my Foot upon his Head; this it seems was in token of swearing to be my Slave for ever; I took him up, and made much of him, and encourag'd him all I could.

在他们和我的城堡之间,有一条小河。

It is understood that many significant discoveries have been successively revealed since the third large scale excavation of fossils began at January of 2008. So far more than 15,000 fossils have been discovered. Not only the fossils of the largest duck-billed dinosaur in the world have been found; but also the fossils of a unique horned dinosaur had been discovered for the first time.

据介绍,在自2008年1月开始至今的第三次大规模挖掘中,山东诸城恐龙化石群重大发现接连不断,截至目前已发现恐龙化石15000多块,不但发现了目前世界上最大的鸭嘴恐龙化石,还首次发现了大型角龙类化石。

Dog has been taken off the menu at the capital's restaurants, sex shops have been closed, food cart vendors have been driven off the streets and people have even been forbidden to hang their laundry out the window, all in the name of presenting the government's idea of a modern,"civilized" image of China to the world.

餐厅里面禁止卖狗肉了;性用品商店在奥运期间全部关门了;街头的小卖车全部被赶出大街了;衣服不许晾在窗户外面了。。。。。。这一切都是打着向世界呈现中国现代化&文明&形象的名义。

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相关中文对照歌词
The Life That Could Have Been
What Could Have Been Love
I Must Have Been A Fool
I Wish I Could Have Been There
Wish I Could Have Been There
It Should Have Been Easy
Could Have Been
It Must Have Been The Mistletoe
Could Have Been The One
It Could Have Been A Brilliant Career
推荐网络例句

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。。。。

The almost sure central limit theorem is a pop topic of the probability research in recent years,because it has many actual applications in the random analogue.

中文摘要:几乎处处中心极限定理是近几十年概率论研究的一个热门话题。它之所以引起人们的注意是由于它在随机模拟方面的实际应用参见Fisher