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to overcome some disadvantages of low precision,slow dynamic response,unconvenience parameter adjust existing in high-power ultrasonic power supply,it applies intelligent control composed of 8089 microcontroller is proposed.the article introduces the modulation principle of spwm,the composition of high-power ultrasonic power system applying the single chip computer to realize the soft of phase lock loop,the mechanism of work and the software thought.it realizes the low loss,high power factor and the whole performance of the circuit is developed.

摘 要：针对目前大功率超声波电源采用模拟控制电路存在精度低、动态响应慢、参数整定不方便等缺点，采用单片机8089组成智能控制的超声波电源系统。提出了基于spwm技术的双闭环控制策略和应用单片机实现软锁相的工作原理和软件思想，使整个超声波电源实现了低损耗、高功率因数，优化了电路的整体性能。

to overcome some disadvantages of low precision,slow dynamic response,unconvenience parameter adjust existing in high-power ultrasonic power supply,it applies intelligent control composed of 8089 microcontroller is proposed.the article introduces the modulation principle of spwm,the composition of high-power ultrasonic power system applying the single chip computer to realize the soft of phase lock loop,the mechanism of work and the software thought.it realizes the low loss,high power factor and the whole performance of the circuit is developed.

寂寞网民何时&回家吃饭&？基于单片机8089的超声波电源控制技术的研究。裴玖玲屈百达□摘要：针对目前大功率超声波电源采用模拟控制电路存在精度低、动态响应慢、参数整定不方便等缺点，采用单片机8089组成智能控制的超声波电源系统。提出了基于spwm技术的双闭环控制策略和应用单片机实现软锁相的工作原理和软件思想，使整个超声波电源实现了低损耗、高功率因数，优化了电路的整体性能。

The agitation power consumptions in boiling systems decrease uniformly with the increase of agitation speed, whereas the relative power demand (RPD-the ratio of agitation power input of HEDT for gassed system to that for ungassed system and under the same agitation speed) can maintain at a high level for high gas loadings even when the impeller is operating with a high impeller tip speed. The gas hold-up in the boiling system is much lower than that in the cold gassed system, and the gas hold-up in boiling system increases at first and then decreases with the increase of the agitation power consumption per liquid mass P(subscript m. It implies that the boiling three-phase system has a maximum gas hold-up point. The changes of nucleation site of vapour bubble and the character of suspension of the solid particles with the rotational speed of the impeller are responsible for those behaviors mentioned.

在沸腾条件下，搅拌功率消耗随着搅拌转速的增加有所下降，但HEDT桨具有较高的载气能力，即使在高叶端线速度下，相对功率消耗仍能保持在较高的水平；沸腾体系的气含率随单位质量流体输入功率的增加表现出先增后减的规律，即存在气含率的极大值，蒸汽成核位置和固体颗粒悬浮特性随搅拌功率增加而改变是造成上述行为的主要原因；沸腾体系中的气含率远远低于常温通空气体系。

Geophysical characteristics of Ordovician carbonate rock were studied using drilling data. Impedance is affected mostly by material properties and reservoirs types, to a negligibly extent by lithology and flow. Compact layers and minor\|fracture reservoirs of Ordovician carbonate rock have characteristics of high density, high velocity and high impedance, and the prediction of minor fractures reservoir is difficult by the general seismic ways. Big fractures and fractured\|vuggy and vuggy and cavity reservoirs of Ordovician carbonate rock have characteristics of minor density and low velocity and low impedance in central Tarim basin, which obviously different from the surrounding rock and produce obvious characteristics in seismic data, so reservoirs can be predicted by applying general seismic data.

根据已钻井资料，对塔中地区上奥陶统良里塔格组岩石地球物理特征进行了研究，结果表明：物性、储层类型对波阻抗影响最大，岩性、流体对波阻抗影响较小；奥陶系碳酸盐岩致密层和小裂缝型储层具有密度大、速度高、波阻抗值大的特点，利用地震常规预测手段较难预测出小裂缝型储层，而塔中地区奥陶系碳酸盐岩大裂缝型、裂缝-孔洞型、孔洞型、洞穴型储层具有密度小、速度低、波阻抗值小的特点，与围岩具有较为明显的差异，在地震上可以产生明显的响应，可利用常规地震资料来预测这种类型储层。

The high speed lumber compound machining center was the woodworking machinery profession key equipment, this paper elaborates the present development Qituation of the contemporary woodworking profession, analyzes the princple of the high speed lumber compound machining center control system, takes UMAC as the core component and develops control system used in the high speed lumber compound machining center by combining its harduare with its soft wase.

高速木材复合加工中心是木工机械行业的关键装备，文中阐述了当代木材加工行业的发展现状，分析了高速木材复合加工中心控制系统的原理，并且以UMAC为核心器件，在配合其硬件和软件的基础上开发了一种用于高速木材复合加工中心控制系统。

Series 912HP High Pressure Hose Drop Backflow Preventers are specifically made for isolation protection on high pressure plumbing supply lines, such as high pressure hose drops which are used for the washdown of equipment and facilities.

系列912HP高压低垂软管防回流阀专用于对高压供应管道提供隔离保护，如用于设备和设施冲洗的高压低垂软管。

Because of the high assay and good suspension, 70% Niclosamide wettable powder is of high competitiveness in the market, also has high effect and low toxicity.

可湿性粉剂组方独特，悬浮性可达85％以上，高于世界卫生组织规定的50％标准。70%杀螺胺可湿性粉剂产品含量高、悬浮性好，具有较强的市场竞争力，同时具有高效、低毒等特点。

Pouring water gyration sterilize kettle which use theory of the hot water of high temperature and high pressure to spray on the wrappage of food and quickly sterilizing in high temperature.

淋水回转式杀菌釜是采用高温、高压之热水喷淋于食品包装物表面做多种食品的高温快速杀菌处理的原理。

Zantedeschia aethiopica constructed wetland system has high COD and N removal rate in dominant period than in vigorous period, caused by the high temperature in dominant period. Low TP removal rate in dominant period than in vigorous period caused by the following reasons, first the decay of litter in the dominant period is obvious, and the high inflow rate in the dominant period.

马蹄莲人工湿地系统在休眠期（6月和7月）和在旺盛生长期相比，由于温度高而具有高的COD，和N去除率，由于枯枝落叶的腐烂溶出以及进水负荷高而具有低的TP去除率。

Be a large-scale, the file time is high, the equipments perfect and super and large business sail mothe r － the Shanghai Caoan machinery mark, be have a foothold in the high point of departure, high personal status on the programming, on the design the principle that persistence" make people the center", press the factory's principle of management fixed position: Break the tradition is subjected to be limited by the shop front, the office building demonstration space small, depend the mode of the manpower sale, provided to gather the demonstration and play to show, trade etc.

作为一座规模大、档次高、设备完善的超大型商业航母——上海曹安机械市场，在规划上立足于高起点、高品位，在设计上坚持&以人为本&的原则，按厂商的经营理念定位：打破传统受限于店面、写字楼展示空间小，靠人力销售的模式，为厂商提供了集展示、演示、交易等多功能为一体的超大型商业舞台，不仅扩大了行销通路，解决了库存现货的压力，同时让厂商仿佛拥有一组阵容强大的幕群，能随时随地掌握市场动态，降低销售成本，实现常年展示、天天交易。

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。