超声波

Changes in Xc for different pulp cellulose fibers are not the same during the ultrasonic treatment. Crystallization and decrystallization may both exist during the treatment at the conditions of lower-intensity ultrasonic wave. After treatment with ultrasonic Xc of MBKP cellulose is decreased and that of EBKP is increased. The changes of Xc of different pulp cellulose are more closely correlated to the fibers' morphology size and the cavitation state. The maximum Xc of 84% is obtained when BEKP cellulose is treated under the conditions of ultrasonic frequency f=23-25kHz, power=400w, and treatment time t=720s.

不同原料来源的纤维素纤维，由于形态尺寸和超分子结构的差异，经超声波处理后超分子结构表现出不同的变化规律；超声波处理过程中，结晶和消晶两种作用同时存在；超声波功率对纤维素的结晶度有较大的影响，对晶体尺寸有一定程度的影响，但结晶度Xc与超声功率没有线性关系；在频率为23-25kHz，功率为400W条件下，对桉木漂白浆纤维进行超声波处理，可获得高结晶度（84%）的纤维素样品。

The results show that the effect of addition or no-addition of degasser on grain refinement of Al-5.0%Si alloy ingot is...

结果表明，除气剂的添加与否对Al-5%Si合金铸锭组织的细化没有影响，铸锭由粗大的柱状晶组织构成；采用合适的超声波处理时间，Al-5%Si合金铸锭的等轴晶获得率大幅度提高，可使整个铸锭组织变为细化的等轴晶组织；超声波振动时间过长将导致铸锭内气孔的增加；根据克劳修斯-克拉柏龙方程，某一强度的超声波引起的压力冲击波作用，导致液相转变为固相，引起了超声波的细晶作用。

Si ingots were studied under different ultrasonic frequencies,e g without degasser and ultrasonic,with degasser only,with degasser and ultrasonic under constraint cooling in the bottom of the ingot.

研究了不同超声波频率下熔体处理方法对Al-1.65%Si铸锭除气的影响，如：没有添加除气剂和超声波处理、只添加除气剂不进行超声波处理、铸锭底部强冷情况下既添加除气剂又进行超声波处理的情况。

The effects of the melt treatment methods on the degassing efficiency of ultrasonically refined Al-1.65%Si ingots were studied under different ultrasonic frequencies,e g without degasser and ultrasonic,with degasser only,with degasser and ultrasonic under constraint cooling in the bottom of the ingot.

研究了不同超声波频率下熔体处理方法对Al-1.65%Si铸锭除气的影响，如：没有添加除气剂和超声波处理、只添加除气剂不进行超声波处理、铸锭底部强冷情况下既添加除气剂又进行超声波处理的情况。

Through comparing the ultrasonic refining effect with the traditional method for refining the waste silk frison material and studying on the feasibility of ultrasonic and the effect on the physicochemical property of the fiber,the reliable foundation was established that existing technique can be replaced by the ultrasonic method in the refining processes.

通过对超声波在绢纺长吐类原料中精练效果与传统工艺的比较，以及对超声波精练方法的可行性及超声波精练方法加工对纤维机械物理性能影响的研究，得到利用超声波精练代替现有加工工艺的可靠依据。

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 yeast treated by ultrasonic wave hardly affect the ferm...

超声波处理的酵母菌对发酵进程影响不大，均能正常发酵，对发酵后的酒样影响较大，经方差分析发现：酒度间存在显著性差异，超声波处理的酒度大部分降低，个别升高；残糖含量差异极显著，经超声波处理样品残糖含量均比对照高；各样品的总酸和挥发酸含量差异显著；超声波对总酚含量的影响不明显，对蛋白含量影响较大。

This study choose Changle Gaoya reservoir irrigation areas as the study sites, through the installation of different ultrasonic equipment on open channel of non-uniform flow to study the flow gauging of non-uniform flow in open channel:(1)5 tracks ultrasonic open channel flow meter used to real-time monitoring the flow of velocity ,water depth and discharge;(2)Ultrasonic liquid level gauge used to real-time measure the upper level and tail level of the two sections ,then the computer calculated average water level, gradient of water table and discharge;(3)Change the open channel water conveyance into pipeline full flow water conveyance, installed the ultrasonic liquid level gauge and pipe flow gauge on the inflow point and surface of pipe, water level and discharge would detect in real time.

本研究以山东省昌乐县高崖水库灌区为研究地点，通过安装在灌溉明渠上的不同超声波设备对明渠非均匀流的测流进行了研究：(1)用五声波超声波明渠流量计对测流渠段的流速、水深及流量进行了实时监测；(2)用超声波液位计将测流渠段的上下游两断面水位实时测出，再用计算机分时段算出平均水位、水面坡降及流量；(3)将测流渠段明渠输水改造成管道满流输水，分别在管道进口前及管管上安装超声波液位计和管道式流量计，将水位和流量实时测出。

I Division specializes in ultrasonic metal welding head welding machine and steel manufacturing, used in refrigerators; freezer; air conditioners cut brass closures, automotive wiring harness ultrasonic welding , solar heat-absorbing plate rolling ultrasonic welding, aluminum-plastic composite pipe rolling ultrasonic welding, spot welding, such as lithium-ion battery.

我司专长于超声波金属焊接机及钢焊头的制造，应用于冰箱；冷柜；空调等铜管封切，汽车线束超声波焊接，太阳能吸热板超声波滚焊，铝塑复合管超声波滚焊，锂离子电池点焊等。

The paper explains ultrasonic effect basal principle,and reviews the application of the ultrasonic technology active material extracts hit the target application condition in natural substance ,reaches the ultrasonic technology draw natural substance has draw rate high-speed,merit such as quick and not change effective component.

简述了超声波作用的基本原理，综述了超声波技术在天然产物活性物质提取中的应用情况，得出了超声波技术提取天然产物活性物质有着提取率高、速度快且不改变有效成份等优点。讨论了超声波提取中应注意的问题

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。