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Firstly, this paper investigated roundly the basic theory of the ambient vibration method, analyzed systematically the main methods of ambient vibration identification, and discussed their advantages and disadvantages. Then we established the finite element model of structural dynamics and test model and analyzed their mutual relation, improved MUSIC method and correlation function method in the harmonic identification, and gave the subspace method and correlation function method based on continuous model, which is multi-harmonic retrieve technique. And then, this paper also puts forward least-squares method to estimate directly structural physical and modal parameters; this approach replaced the derivative operator in the continuous time model with an equivalent approximation, and estimated the physical parameters of structures by the least-squares method. And then, we discussed the approximation methods of derivative and their convergence. Finally, this paper researched the modal parameters of a frame structure by the simulation and test. The results demonstrated that subspace method, correlation function method and the least-squares method are effective and stable respectively.
全面地研究环境振动识别方法的基本理论,系统地分析环境振动识别方法的主要方法,讨论它们的优点和不足;建立结(来源:6666AB44C论文网www.abclunwen.com)构动力学的有限元模型和试验模型,分析有限元模型与试验模型之间的相互关系;改进谐波识别中的MUSIC识别方法和相关函数识别方法,给出大型结构模态识别的连续型的子空间分解识别方法和相关函数识别方法,这个方法是多元谐波识别方法;提出直接识别结构的物理参数和模态参数的最小二乘方法,这个方法利用导数的近似值代替导数值,并运用最小二乘方法识别结构的物理参数,讨论导数近似值的选择方法,分析算法的收敛性;通过仿真计算和模型实验,研究高层框架结构的模态参数识别,验证子空间分解识别方法、相关函数识别方法和最小二乘识别方法的有效性,算法的稳定性;从理论和试验两个方面分析和研究噪声对识别精度的影响,影响识别精度的因素,以及部分模态成分的模态参数不能够被识别的原因。
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Then from his loftie stand on that high Tree [ 395 ] Down he alights among the sportful Herd Of those fourfooted kindes, himself now one, Now other, as thir shape servd best his end Neerer to view his prey, and unespi'd To mark what of thir state he more might learn [ 400 ] By word or action markt: about them round A Lion now he stalkes with fierie glare, Then as a Tyger, who by chance hath spi'd In some Purlieu two gentle Fawnes at play, Strait couches close, then rising changes oft [ 405 ] His couchant watch, as one who chose his ground Whence rushing he might surest seize them both Gript in each paw: when Adam first of men To first of women Eve thus moving speech, Turnd him all eare to hear new utterance flow.
魔鬼就是这样以"不得已"的暴君口实来开脱自己的罪恶的。然后从高耸的树上,高高的立脚点,降落在嬉戏着的四脚兽群之间,他自己变化无常,努力装扮成接近他的牺牲品的形状,以便神不知鬼不觉进行详细侦察,从他们的言语和行为,进一步观察他们二人的情况。
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Made arrhythmia models of rats by injecting digitoxin,then treated then by injecting nifedipine and compared then with phenytoxin sodium group. Result Nifedipine can not cure arrhythmia,instead making it worse.
注射洋地黄建立大鼠心律失常模型,分别注射硝苯地平治疗,并与注射苯妥英钠组进行比较结果:硝苯地平不能治疗心律失常,反而使心律失常加重。
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Methods Animals were randomly and equally divided into five groups: saline control group, positive drug control group, low-dose, medium-dose and high-dose crocetin group. Animals were anesthetized with urethane (1.2 g/kg), then followed by the perfusion of aconitine (10 μg/mL) through caudal vein in rats, or of ouabain (9 μg/mL) through external jugular vain in guinea pigs in a constant velocity of 0.1 mL/min, and the emergence time of ventricular fibrillation, ventricular extrasystole, ventricular tachycanlia and cardiac arrest were then detected and recorded. The recorded time was then translated to the cumulated amount of aconitine and ouabain. Experimental arrhythmia was induced by rapid injection of 4% CaCl2 (140 mg/kg), and the emergence time, persistence time, incidence and death of arrhythmia after the administration were observed.
将实验动物随机分为生理盐水组,阳性药物对照组,藏红花酸高、中、低剂量组,SD大鼠采用1.2 g/kg乌拉坦麻醉后,从尾静脉匀速(0.1 ml/min)灌注10μg/ml乌头碱溶液,豚鼠麻醉后从颈静脉匀速(0.1 ml/min)灌注9μg/ml哇巴因溶液,观察出现室性期前收缩、室性心动过速、室颤和心脏停搏的时间,然后换算成乌头碱和哇巴因的累积量;快速推注4%氯化钙(140 mg/kg)诱导大鼠心律失常,观察给药后心律失常出现时间、持续时间、心律失常发生数及死亡数。
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And yet, in Raissa, at every moment there is a child in a window who laughs seeing a dog that has jumped on a shed to bite into a piece of polenta dropped by a stonemason who has shouted from the top of the scaffolding,"Darling, let me dip into it," to a young serving maid who holds up a dish of ragout under the pergola, happy to serve it to the umbrella-maker who is celebrating a successful transaction, a white lace parasol bought to display at the races by a great lady in love with an officer who has smiled at her taking the last jump, happy man, and still happier his horse, flying over the obstacles, seeing a francolin flying in the sky, happy bird freed from its cage by a painter happy at having painted it feather by feather, speckled with red and yellow in the illumination of that page in the volume where the philosopher says:"Also in Raissa, city of sadness, there runs an invisible thread that binds one living being to another for a moment, then unravels, then is stretched again between moving points as it draws new and rapid patterns so that at every second the unhappy city contains a happy city unaware of its own existence."
可是,在莱莎的每一刻钟都听得到窗旁的小孩的笑声,因为他看见一头狗扑上小屋抢吃一块烧饼;烧饼是棚架上的石匠掉下的;他当时正在向一个年轻的女侍应员高声喊叫:"好人,让我尝一尝";那年轻女子正捧着肉汤满心高兴地送给一个庆祝交易成功的制伞工人;爱上青年军官的一位贵妇人在赛马场炫耀她的镶花边的白阳伞;马背上的军官最后一次跳跃时向她笑了一笑;他是个快乐的人,不过他的马比他更快乐,它跳栏的时候看见鹧鸪在天上飞;快乐的鸟儿刚被一位画家放出囚笼;快乐的画家完成了鸟的插图,描出它每一根红黄斑点的羽毛;插图的书页上有哲学家的话:"忧愁的城市莱莎也有一根无形的线,在某个顷间把一个生物连系上另一个生物,然后松开,又在两个移动的点之间伸展,快速画出新的图形,因此,不快乐的城市在每一秒钟都包藏着一个快乐的城市,只是它自己并不知道罢了。"
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Finally, the grafting polymerization of textile materials initiated by microwave low temperature plasma was conducted. Knitted cotton fabric was grafted by AMPS first, then knitted cotton and terylene/cotton fabrics were grafted with AMPS/NIPA dualistic monomers respectively. By means of grafting polymerization, the P dualisticintelligent hydrogel was added to textile.The influences of the factors on add-on, such as treatment time and power of plasma, concentrations of crosslinking agent and total monomers, proportion of AMPS, polymerizing temperature and time etc, was studied fully. The optimal conditions of grafting polymerization initiated by microwave low temperature plasma were determined by orthogonal design, variance analysis and mathematical statistics method so as to analyze the main influencing factors. Then swelling/deswelling kinetics, temperature-sensitivity and pH-sensitivity of grafted textile were studied. The performance indexes of hydrostatic pressure, moisture permeability and bursting strength of the knitted cotton and terylene/cotton fabrics before and after grafting were compared and evaluated synthetically.
此后用微波低温等离子体引发纺织材料的接枝聚合反应,分别研究了棉针织物接枝AMPS和棉、涤棉混纺针织物接枝AMPS/NIPA二元单体,使智能凝胶以接枝的方式添加到纺织材料上;详细探讨了微波低温等离子体处理功率和时间、总单体浓度、AMPS单体浓度、交联剂浓度及聚合反应温度和时间等因素对增重率的影响,通过正交设计、方差分析及数理统计对各影响因子进行分析,确定了微波低温等离子体引发接枝聚合的最佳工艺条件;对接枝纺织材料的失水-吸水动力学、温度敏感性、pH敏感性等进行了研究;对接枝前后棉、涤棉混纺针织物的静水压、透湿性和顶破强力等服用性能指标进行了对比和综合评价。
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The Shah Dynasty found then lasted until now. Nepal was invaded by Britain in 1814 and forced to cede a vast expanse of territory to India which was controled by Britain at that time. Its diplomacy was supervised by Britain as well. During the period from 1846 to 1950 Nepal was controled by Rana Family . The fight aganist it intrigued by Nepali Congress brought the dormination of Rana Family to an end, and constitutional monarchy was put into practice. In February of 1959 ,Mahemdra Bir Bikram Shah Dev issued the first constitution of Nepal, the New Constitution was issued in 1962. Birendra , Bir Bikram Shah Dev ascended throne in1972, he dismissed the National Panchayat in the April 16, 1990,and he also issued the third constitution in Nov ember of the same year. Then the multi-party of constitutional monarchy was set up.
建立了沙阿王朝,延续至今。1814年英国入侵,尼泊尔被迫割让大片领土给英属印度,外交受英监督。1846年―1950年为拉纳家族统治时期。1950年11月,尼泊尔大会党等发起反拉纳的斗争,结束了拉纳的统治,并实行君主立宪制。1959年2月马亨德拉颁布尼泊尔第一部宪法。1962年颁布新宪法。1972年比兰德拉国王即位。1990年4月16日,比兰德拉国王解散全国评议会,同年11月颁布第三部宪法,实行君主立宪的多党制。
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The principal purpose of this study is to set up the isolation methods for diphtheria toxin expressed by genes, to purify the toxin with complete biological activities, and to make researches on its toxicities. In the experiments, the target gene was inserted into the cloning vectors--pET22b, then the vectors were introduced into host cells -BL21(DE3). The expression of the toxin was induced by addition of IPTG. The expression products were purified by His-6 label affinity chromatography. Then the diphtheria toxin expressed was transferred to PVC membrane using semidry blotter to determine the amino acid sequence of N-terminal. The "nicked" diphtheria toxin linked by disulfide bond was gained by protease hydrolysis.
为建立重组基因表达白喉毒素的分离纯化方法,制备出具有生物活性的蛋白质毒素,构建了白喉毒素表达载体pET22b-DT,并转入大肠杆菌BL21(DE3)中诱导表达,以融合表达的His-6作为标签通过亲和层析纯化;表达毒素经蛋白酶酶切后,形成了以二硫键连接的与天然结构相同的带"缺口"的白喉毒素,并测定白喉毒素对豚鼠的急性毒性和细胞毒性。
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--- Method and apparatus for abstracting water from air wherein in a first phase of a recurring cycle a stream of cool, moist air from the atmosphere first cools a first heat storage condenser (1) and then humidifies a hygroscopic medium (14); in a second phase a stream of warm air additionally heated by solar radiation expels moisture from the hygroscopic medium and carries the moisture into said first heat storage condenser (1) where it condenses, releasing condensation heat, and drains away; in a third phase another stream of cool, moist air from the atmosphere first cools a second heat storage condenser (2) and then rehumidifies the hygroscopic medium, and in a fourth phase another stream of warm air heated by solar energy again expels the moisture from the hygroscopic medium and carries the moisture to said second heat storage condenser where it condenses and drains away, and wherein the warm air streams of the second and fourth phases, are preheated using the heat of condensation picked up by the said second heat storage condenser (2) in the fourth phase and the heat of condensation picked up by said first heat storage condenser (1) in the second phase, respectively, before being additionally heated by solar radiation and being used to expel moisture from the hygroscopic medium.
摘要---方法和仪器取水,从空气,其中在第一阶段的周期性循环流冷静,潮湿空气从大气中的第一冷却的第一个蓄热冷凝器( 1 ),然后humidifies一吸湿中等( 14 );在第二阶段流的暖空气此外,激烈的太阳辐射驱逐水分从吸湿中等,并进行水分成表示,第一蓄热冷凝器( 1 )凡它凝结,释放出凝结换热,及雨水渠的距离;在第三阶段另一流的冷静,潮湿空气从大气中冷却,第一第二蓄热冷凝器( 2 ),然后rehumidifies该吸湿中等,而在第四个阶段的另一流的暖空气加热太阳能再次驱逐水分从中期和吸湿性带有水分说,第二蓄热冷凝器而凝结及排水渠远离,和其中的暖空气流,第二和第四阶段,预热用热凝结回升,由说,第二蓄热冷凝器( 2 )在第四个阶段和热凝结回升,由说,第一蓄热冷凝器( 1 )在第二个阶段,分别之前,此外激烈的太阳辐射和被用来驱逐水分从吸湿中等。
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A method for making Bisphenol A with a purity of more than 99.7% by reacting phenol and acetone using an acid catalyst, separating a BPA-phenol adduct by crystallisation and removing phenol from the adduct, in which involves continuous suspension crystallisation with a total dwell time of more than 4 hours in at least 3 crystallisers, by cooling first to 50-70 C in two parallel crystallisers and then to 40-50 C in a third crystalliser connected in series with the first two.; A method for the production of Bisphenol A with a purity of more than 99.7%, by reacting phenol with acetone in presence of an acid catalyst, separating a BPA-phenol adduct from the product mixture by crystallisation, filtration and washing, and removing the phenol from the adduct, in which stage involves continuous suspension crystallisation in at least three crystallisers connected in such a way that the mixture is first cooled to 50-70 C in two crystallisers in parallel and then cooled to 40-50 C in a third crystalliser in series with the first two, the total residence time of the mixture over all crystallisers being more than 4 hours.
描述用于生产纯度大于99.7%的双酚例如,双酚A(BPA的方法,这种方法包含苯酚和丙酮在有酸性催化剂参与的情况下反应形成一个包含双酚的产物混合物;通过结晶、过滤和洗涤从该产物混合物中以双酚/苯酚复合物的形式除去至少一部分双酚以提供双酚A/苯酚复合物晶体;并且从双酚/苯酚复合物晶体中除去至少一部分的苯酚以提供纯度大于99.7%的双酚;其中结晶过程包括连续的混悬液结晶,并且是在至少三个结晶装置中进行的,装置的排列使得产物混合物首先在结晶过程的第一阶段在第一个结晶装置和并联的第二个结晶装置中被冷却到50至70℃的温度,随后在结晶过程的第二阶段在与第一和第二个结晶装置下游串联的第三个结晶装置中被冷却到40至50℃的温度,并且其中产物混合物在结晶过程中的总驻留时间在4小时以上。
- 相关中文对照歌词
- Then Days Went By
- 推荐网络例句
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But we don't care about Battlegrounds.
但我们并不在乎沙场中的显露。
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Ah! don't mention it, the butcher's shop is a horror.
啊!不用提了。提到肉,真是糟透了。
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Tristan, I have nowhere to send this letter and no reason to believe you wish to receive it.
Tristan ,我不知道把这信寄到哪里,也不知道你是否想收到它。