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Analysis show a sharp decrease in annual wind speed in most part of North China in recent ten years which is more obvious than that of temperature and precipitation, and this may lead to the decrease in sand dust storm frequency.

分析结果表明了近10年来北方大部分地区的年均风速于快速下降过程，其变化幅度大于气温和降水等的变化，在这种趋势下可能会导致沙尘暴发生频率减少。

Firstly, based on the sliding mode control and backstepping technique, a new attitude tracking controller is derived to control the attitude motion of spacecraft, the stability of the system is analyzed via Lyapunov method and the reaction wheel dynamics is also considered from the real applications point of view. The whole design process is divided into two steps: the first step is to use sliding control technique to design suppositional adaptive variable structure controller; and the second step is to design attitude tracking controller based on SMC and backstepping technique. Numerical simulations are performed to show that both tracking maneuver and vibration suppression can be accomplished effectively.

首先，采用自适应后步法结合主动振动控制技术设计了姿态跟踪鲁棒控制器，基于Lyapunov方法分析了系统的渐近稳定性；在此基础上，显性地考虑了执行机构动态特性问题，将整个设计过程分为两个步骤：第一步采用滑模控制技术设计了变结构虚拟控制器，给出自适应控制律的设计方法；第二步，将后步法与滑模控制技术相结合，设计了姿态跟踪鲁棒控制器，给出飞轮电压的输入算法及稳定性分析；最后，将提出的控制方法应用于挠性航天器的姿态跟踪控制，通过数值仿真对所提方法的可行性与有效性进行分析和验证。

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 dark thing, mostly hidden by one of the vine-covered walls, darted closer.

暗影隐藏于一段覆着藤蔓的矮墙之后，靠得更加近了。

By the variety of the air temperature, air pressure, the wind velocity direction of wind...etc. similar from the strong aerodynamics angle in the valley breeze, formation and daytime contrary thermodynamic energy circulation, full elucidation oasis and the sky of the deserts really exist the level air pressure , then cause the vicinity district layer circulation produce, deliver the calories to the oasis to cause improving temperature effect the desert.

从大气动力学角度看气温、气压、风速风向等的变化类似于山谷风，形成与白天相反的热力环流，充分说明绿洲和沙漠上空确实存在着水平气压差，进而导致近地层环流产生，把热量传送到绿洲引起沙漠增温效应。

He spent nearly three days time to put into a vacuum glass bulb filament, pass on the power to issue the equivalent of 10 gas lamps of the gentle light, which lasted about 45 hours.

他花了近3天时间把灯丝装进真空玻璃泡，通上电源，发出相当于10盏煤气灯的温柔光芒，它延续了约45个小时。

LZC electromagnetic valve products total of more than 50 series, nearly 8,000 types of specifications, widely used in aerospace, IDF goods, nuclear industry, shipbuilding industry, petrochemicals, metallurgy, electronics, electrical appliances, electrical equipment, terminal equipment, gas, electroplating Painting , Textile printing and dyeing, medical equipment, food machinery, tobacco, water treatment works, HVAC works, fire safety and building automation projects, more than 200 industry sectors, exports more than 20 countries and regions.

LZC电磁阀产品共有50多个系列，近8000种型号规格，广泛应用于航天、国防军品、核工业、船舶工业、石油化工、冶金、电子、电器、电力装备、码头装备、燃气、电镀涂装、纺织印染、医药设备、食品机械、烟草、水处理工程、暖通空调工程、消防安全、以及楼宇自动控制工程等200多个行业领域，产品出口20多个国家和地区。

Through an analysis on mud-clogging mechanism of suction nozzles on wet type sweeper, a concept is suggested, that water ratio in dust nearing the wall of suction nozzle duct should be decreased so the mud stickiness can be controlled under a critical value and not sticking to the duct wall whereas water ratio in central dust passage of the duct is properly increased to satisfy effective dust absorbing. On the basis of the concept, a water spraying device is designed with improvement for suction nozzles. In the device, the water hole numbers, diameters and distribution along the nozzle circumference as well as initial direction of water spraying are all determined according to concrete suction nozzle structures.

通过对湿扫型道路清扫车的吸嘴易被泥土堵塞的机理分析，提出降低吸嘴流道近壁的尘土的含水率，控制泥块的黏性处于临界黏性以下，使泥块不黏附于流道壁面；而将吸嘴流道中心部位的尘土的含水率适当加大，以满足有效压尘的解决思路，并根据这种思路改进设计了一种吸嘴喷水装置，按不同吸嘴的具体结构确定孔数、孔径、孔沿圆周的分布规律和喷水的初始方向等要素。

China is about to adopt its 11th five-year plan, setting the stage for the continuation of probably the most remarkable economic transformation in history.

这是旨在造福于世界近1／4的人口，为或许是历史上最为可观的经济转型的持续发展所做的准备。

Fuyang integrity Takahashi Spring Factory is located in the spring production base, near Pro Fuchunjiang beautiful, transportation convenience, is located in 320 State Road, Shanghai-Hangzhou-Ningbo high-speed traffic on Route.

富阳诚信弹簧厂座落于高桥弹簧生产基地，近临美丽的富春江，交通便捷，地处320国道、沪杭甬高速等交通干线之上。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。