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The responses properties of coupled vibrations for 120° and 180°asynchronous juxtaposition of 200MW turbine-generator set were analyzed. The results show that the responses properties of flexural and torsional vibrations caused by 120° asynchronous juxtaposition are similar to that of 180° asynchronous juxtaposition. When the fault happened, Former two steps inherence frequencies and whirl speed frequency of torsion are excited. And the first step inherence frequencies of flexural vibration are also excited besides whirl speed frequency. Transient electromagnetism moment peak, torsional and torsional moment responses caused by 180° asynchronous juxtaposition are lower than that of 120° asynchronous juxtaposition.

利用该方法,针对某200MW汽轮发电机组的120°和180°两种非同期并列情况,进行了机组弯扭耦合振动响应特性研究,分析表明:汽轮发电机组的120°和180°两种非同期并列情况下的弯振和扭振响应特性基本相似;非同期并列主要激发出工频和前两阶固有频率扭振,弯振除工频主分量外,第一阶固有频率也被激发出来;180°非同期并列时的暂态电磁力矩峰值比120°非同期并列时低,相应的扭振和扭矩响应也小于后者。

The dynamic and ouput performance of the inverter system is also analysed by simulation with Saber software, and the main reasons is enduced. As the calculate speed of the DSP core is consided, digitally and analogically hybrid control scheme is adopted in this paper.

分析了两态滞环电流控制DBI的控制原理,利用Saber电路仿真软件对逆变器系统进行了仿真,并对系统的动态性能以及外特性进行了研究,得出影响系统动态性能及外特性的主要因素。

The results showed the different fluorescence property with naphthalene due to the interaction, congruence of the molecules and formation of inter- or intramolecular exciplex.;A series of dithioesters with different aromatic rings such as naphthally, anthracyl and pyrene in R groups were synthesized. The polymerizations of MMA using these dithioesters as the RAFT agents were investigated.

结果表明:在NMNDT和它获得的聚合物溶液中,由于分子间的相互作用、叠合,激发态分子与基态分子形成了激基缔合物,引起了萘环荧光的淬灭,使其发光特性与原来萘的发光特性不同;探索了二硫代酯中R基团的立体和电子等性能对MMA的RAFT聚合的影响。

This test studied some biological and bionomical characteristics of this pest, including life stages,developmental threshold and day-degree requirements,longevity,NO.

本文研究了西花蓟马的生活史、发育起点温度和有效积温、成虫寿命、产卵量和产卵规律、不同虫态的存活率、实验种群生命表、活动习性、危害特点、寄主选择性、种群动态等生物学和生态学特性,调查了西花蓟马在北京的分布、为害规律及嗜食特性等,并对色卡诱集技术、虫生真菌对该虫的致病性等一些防治技术进行了初步研究,主要结果如下。

The static optical recording characteristics were studied by the home-made static characterizer, the high contrast pattern can be produced by 780 nm laser pulses and can be erased by heating.

利用自制的光学信息写入系统研究了m-NBMN/DAB有机薄膜的静态存储特性,发现在780 nm激光脉冲的作用下m-NBMN/DAB有机薄膜具有光学双稳态特性,并且在大气中加热薄膜可实现信息擦除。

to study the polymorphism of biological characteristics of Eichhornia crassipes and supply theoretical evidences for studies on it ecological characteristics and reasonable control.

研究水葫芦生物学特性的多态性,以期为研究生态学特性和合理防治提供理论依据。

The average degradation percentage in sarcoplasmic proteins, myofibrillar proteins and stroma pronteins were ordinally 62.07%, 46.15% and 8.56%, so that substances coming from degradation of sarcoplasmic proteins and myofibrillar proteins notabily effected qualities of jinhua hams.

在主成分分析中,总氮、肌原纤维蛋白、pH值、肌浆蛋白、PeN、浙江大学硕士学位论文NPN和核酸态氮对金华火腿理化特性的解释能力可达81 。38%,反映了金华火腿理化特性变异的绝大部分信息。

FeSi nanoparticles were synthesized via thermal decomposition of iron pentacarbonyl in the solution of dioctyl ether, stabilizers oleic acid and oleylamine. The TEM images showed that FeSi nanoparticles had cubic shape, but it seemed that the composition was not uniform. According to the EDS results, the Fe:Si ratio of gray-uniform nanopaiticles was almost 1:1, and blacker FeSi nanoparticles contained more Fe atoms. Although FeSi didn't have uniform structure, it still could be proved that the incorporation of Fe and Si existed in a single nanoparticle. All possible structure, lattice, binding, morphology, surface condition would be discussed. These results indicated that perhaps FeSi2 was the main structure of the new products; however, due to incompletely combination and less synthesized time, it might still contain some part of Si and Fe structure. Besides, FeSi nanoparticles preserved the optical properties from Si atoms, but the PL intensity was much lower. The maxima PL peak appeared at 388 nm with the excitation at 300 nm. Their saturation magnetization, remanent magnetization and coercivity were measured by the SQUID, exhibiting their nearly superparamagnetic behavior.

利用热裂解系统可成功将研磨矽奈米粒子及五羰铁结合,制备出铁矽奈米粒子;从穿透式显微镜照片可知其粒子呈现立方体型态,但颜色深浅及组成不均,EDS结果则显示颜色均匀之粒子铁与矽之组成大致为1:1,颜色较深之粒子则含有较高量的铁元素;尽管组成比例并不统一,但单颗粒子同时含有矽与铁两种元素,初步说明铁矽奈米粒子之形成;进行多种结构与表面分析并探讨所有可能之键结、结构及表面元素后,推测铁矽奈米粒子可能以FeSi2之结构形成,并同时包含未重组完成的矽及铁之结构;利用PL分析得知铁矽奈米粒子确实保留矽之放光特性,并在300 nm激发光源下,於波长388 nm处有一最强放光特性峰,但整体发光效益不及研磨矽奈米粒子之结果;最后,利用超导量子干涉磁化仪量测其饱和磁化量、残留磁化量、与矫顽磁力,发现磁滞现象并不明显而几乎呈超顺磁性。

Results indicate:(1) The newly developed simulation technology can form fairly average and easily controllable back pressure downstream the inlet, so it can he used to investigate the back pressure characteristics of hypersonic inlets.(2) By regulating the valve of injection pipe, the simulation technology can realize the switch of hypersonic inlet started state and unstarted state in about 8 milliseconds, so it is suitable to investigate the starting/unstarting/resarting problem of hypersonic inlets.

结果表明:(1)所提出的凹腔喷流技术可在进气道下游形成较为均匀的、可控的背压环境,因此可用于进气道的反压特性研究;(2)适当调节凹腔的喷流总压,并在实验中实时控制阀门的开度,凹腔喷流技术能够在较短的风洞实验时间内(约8s)实现进气道起动、不起动、再起动流态之间的切换,因此可用于进气道的不起动/再起动特性研究。

The main content included in the paper is as follows: The European identification methods of type of wave load is introduced and compared with the methods in Code of Hydrology for Sea Harbour. In order to reveal their difference, they are tested by the experiment data. The relation between phase and frequency are analysed through the Hilbert and wavelet transformations. And a new method of identifying the breaking wave load is set up based on the linear relation between wave height and wave press before the breakwaters. The probability distribution is tested by the statistic of experiment data. Based on the experiment data, the paper analysed the influence of reflection coefficient according to different factors, and its property is got. The work property of charmfered breakwater under breaking waves is analysed. Through the statisticof its wave press and wave force the distribution of press on the breakwater front face and its reducing effect to breaking wave force are proved.

本文基于此,通过实验研究,主要作了如下工作:介绍了欧洲波态划分方法,分析与我国方法的异同,通过实验进行了验证;通过 Hilbert 变换和小波变换对波浪破碎的相频特性进行了分析,通过建立波高与波压关系来判别破碎波浪力;对破波条件下波浪力的分布进行了统计研究,验证了其分布类型;利用实测资料,分析了不同因素对反射系数的影响,得出了不同周期、波浪要素、破碎率下反射系数体现的不同规律;分析了破碎波作用下削角堤的工作特性,通过对堤面所受的波压力和总力的统计分析,验证了压强分布规律及削角堤对波浪力的削减作用。

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In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国,慢性酒精中毒,肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题,你可以随时联系我。

Very pretty, but the airport looks more fascinating The other party wisecracked.

很漂亮,不过停机坪更迷人。那人俏皮地答道。