变小的

For AHU and VAV box, this paper also gives the"minimum static pressure"control logic.

最后提出最小静压法的变风量系统的控制方法，在满足系统送风量的情况下，通过最小静压法可以大幅降低送风系统节流造成的能源损耗，大幅提高了送风系统的效率。

Objective To study the power spectrum density of blood flow ultrasonic Doppler signal using wavelet analysis. Method Doppler signal of blood flow in human common carotid artery was studied with wavelet scalogram analysis, an affine smoothing Wigner Ville transform with a constant "Q" character. Result Wavelet scalogram of blood flow ultrasonic signal had a higher distinguishability than STFT spectrogram in the low frequency portion, but had poorer decussation terms than spectrogram.

对于平稳信号的处理工具仍然是Fourier变换，但是，在实际应用中的绝大多数信号是非平稳的，现在看来处理非平稳信号的主要工具将是小波变换，这主要是因为传统的Fourier变换分析信号时，时间和频率分辨率精度是固定不变的，而利用小波变换分析信号，在信号高频段时间分辨率精度也较高，在信号低频段频率分辨率精度较高，这很符合非平稳信号的特点。

In the single crystal of C60 with a FCC structure,positron mainly appears outside the C60 molecule.The main annihilation space is the interspace between molecules.The calculated positron bulk lifetime in C60 is 352ps, which agrees with experiment value of 356ps in literature.In carbon nanotube bundles with different dimeters,as the diameter of carbon nanotubes increases,the main space where positron appears changes from the interspace of carbon tubes to the space inside carbon tubes,the radio between positron annihilation with valence eletrons and core eletrons becomes larger,the positron bulk lifetime in carbon nanotube increase rapidly first and come to be a constant at the end.The calculated positron lifetime of carbon nanotube with a dimeter of 0.8～1.6ns is 332～470ps,which agrees with the experiment value of 394ps.Positron annihilation has been studied in widly used compound semiconductors.

计算结果表明：在片层结构的石墨晶体中，正电子主要在石墨层间的空隙中湮没，计算出的石墨中的正电子寿命为208 pS，与文献中的实验结果215 ps符合很好；在金刚石单晶中，正电子主要在碳原子之间的空隙中存在并发生湮没，计算出的金刚石中的正电子寿命为115 ps，文献中的实验结果110 ps左右符合；在面心立方结构的C60晶体中，正电子主要在C60分子球壳内外侧及分子之间存在，C60球形分子中心正电子分布很少，正电子的湮没区域集中在C60分子之间的空隙区域，计算出的C60中的正电子寿命为352 ps与文献中的实验结果356ps相符合；对于不同管径碳米管束中的正电子分布，随着碳纳米管直径的增加，碳纳米管束中的正电子由主要在碳纳米管管间的区域出现转变为主要在碳纳米管管内中心的区域出现：碳纳米管束中的正电子与碳原子的价电子的湮没概率变得越来越大，与核心电子的湮没概率变得越来越小；碳纳米管束中正电子的湮没寿命先迅速增大，而后趋于一定值。

CHAPTER I Mrs. Rachel Lynde is SurprisedMrs. Rachel Lynde lived just where the Avonlea main road dipped down into a little hollow, fringed with alders and ladies' eardrops and traversed by a brook that had its source away back in the woods of the old Cuthbert place; it was reputed to be an intricate, headlong brook in its earlier course through those woods, with dark secrets of pool and cascade; but by the time it reached Lynde's Hollow it was a quiet, well-conducted little stream, for not even a brook could run past Mrs.

雷切尔·林德的家就在安维利大街向下斜伸进山谷的地方，四周长满了梢树和野生花草，一条小溪横穿而过，源自老卡斯伯特家农场的树林，上游水流湍急，从树林中蜿蜒奔流，暗藏着许多隐秘的潭水和小瀑布；但当小河流到林德家门前的山谷时，却变得安静而规矩。

By adding an equivalent harmonic impedance in the branch circuit of power grid, this HAPF could force all the harmonic currents flow into passive power filters, which resulting in eliminating harmonic contamination more effective. And using the capacitive feature of PPF in the fundamental frequency, this HAPF could compensate fixed-capacity reactive power without increasing APF's burden. Moreover, in order to decrease APF's cost, the fundamental voltage will largely be endured by capacitor in view of the series resonance circuit tuned at the fundamental frequency, so the APF just bears little harmonic voltages.

其基本工作原理是：有源部分等效于在电网支路中串联了一个谐波阻抗，该谐波阻抗对基波电流不起作用，而对谐波电流产生很大阻碍作用，迫使谐波电流流入无源滤波器，从而达到滤除谐波的目的；同时新型注入式混合有源滤波器还充分利用了无源滤波器的无功补偿功能，在不增加有源部分容量的前提下，可以提供一定容量的无功功率；由于有源部分承受的电网基波电压不大，也没有基波电流流入，因此逆变器容量小，初期投资较小。

But the black kitten had been finished with earlier in the afternoon, and ao, while Alice was sitting curled up in a corner of the gradt armchair, half talking to herself and half asleep, the kitten had been hacing a grand game of romps with the ball of worsted Alice had been trying to wind up, and had been rolling it up and down till it had all come undone again; and there it was, spread over the hearth-rug, all knots and tangles, with the kitten running after its own tail in the middle.

但是黑猫下午就洗完了，所以，当Alice蜷缩在大扶手椅里半梦半醒的自言自语时，小猫已经在和Alice刚才想卷好的毛线球玩了，而且不停地旋转直到它变回没有缠之前的样子；当小猫在中央追着自己的尾巴跑时，毛线球被拽到灶台旁边，所有的结都缠绕起来。

Namely in high-frequency unit use gradually incisive time resolution and lower frequency resolution, in order to moves the near observation signal quickly to change the part; In low frequency partially has the higher frequency resolution and the lower time resolution, in order to moves the far observation signal slowly to change partially, the wavelet this kind of signal analysing expression characteristic to analyzes the non- steady signal is extremely effective, suits the transient state anomaly very much which smuggles in the survey normal signal and demonstrates its ingredient, therefore by reputation for analysis signal microscope.

即在高频部分使用逐渐尖锐的时间分辨率和较低的频率分辨率，以便移近观察信号的快变部分；在低频部分具有较高的频率分辨率和较低的时间分辨率，以便移远观察信号的慢变部分，小波这种信号分析表示特征对分析非平稳信号是非常有效的，很适合于探测正常信号中夹带的瞬态反常现象并且展示其成分，所以被誉为分析信号的显微镜。

Beijing-a super-large city, streets, buildings and plazas here have larger dimensions than a small city-Sichuan. In Beijing a giant city space is divided and wrapped by reinforcements, cement and glass curtain wall; apparently, their existences intend to accommodate more people to live and work in, however, they change ways of direct communication between human and human-all things in a regular order and become indirect and circuitous. E.g., two persons looking at each other on two sides of a street have to bypass a long way to cross over a rail fence in the middle.

身处北京这样的特大型城市，这里的街道、楼宇和广场在规模上有着远比四川小城更大的体量，它们用钢筋水泥和玻璃幕墙把诺大的城市空间分割和包裹，表面上看它们的存在是为了能够容纳更多的人生活和工作于其中，实际上却更加改变了人与人之间相互交流和沟通的直接方式--一切都变得有条不紊，都变得间接和迂回，连马路对面想望的人，都要绕行很远，才能跨越中间的护拦隔离带相聚。

Later, these CPC—ruled areas grew bigger in size and number and these local authorities became the embryonic form of GAR. In 1949, after the founding of the People's Republic of China, CPC decided to establish GAR above province level and after 3 years'practice, divided the country into 6 GARs.

此后，中共统治的区域逐渐由小变大、由少变多，拓展成为由中共中央局&一元化&领导下的跨越数省、统一管辖、相对独立的几个大行政区域，并建立了相应的政权机关，从而形成了中共全面执政后设立的大行政区的雏形。1949年中央人民政府成立后，中共正式确定在省级以上设立大行政区，并经过近二年的摸索与实践，全国正式划分为6个大行政区。

By the same token, any light reaching the surface of the object will have a reflection, if the plane is a rugged, light scattering in all directions will be lost; if the plane is smooth, then we can certainly see the direction of the reflected light .

而鞋油中有一些小颗粒，擦鞋的时候这些小颗粒正好可以填入皮鞋表面的凹坑中。如果再用布擦一擦，让鞋油涂得更均匀些，就会使皮鞋的表面变得光滑、平整，反射光线的能力也加强了。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。