Traditional magneto-electric vibration sensors and servo accelerometers have severe shortcomings when used to measure vibration where low frequency components predominate.A low frequency characteristic extension for v...Traditional magneto-electric vibration sensors and servo accelerometers have severe shortcomings when used to measure vibration where low frequency components predominate.A low frequency characteristic extension for velocity vibration sensors is presented in this paper.The passive circuit technology,active compensation technology and the closed- cycle pole compensation technology are used to extend the measurable range and to improve low frequency characteristics of sensors.Thses three types of low frequency velocity vibration sensors have been developed and widely adopted in China.展开更多
The meandering channel deposit of the upper member of Neogene Guantao Formation in Shengli Chengdao extra-shallow sea oilfield is characterized by rapid change in sedimentary facies.In addition,affected by surface tid...The meandering channel deposit of the upper member of Neogene Guantao Formation in Shengli Chengdao extra-shallow sea oilfield is characterized by rapid change in sedimentary facies.In addition,affected by surface tides and sea water reverberation,the double sensor seismic data processed by conventional methods has low signal-to-noise ratio and low resolution,and thus cannot meet the needs of seismic description and oil-bearing fluid identification of thin reservoirs less than 10 meters thick in this area.The two-step high resolution frequency bandwidth expanding processing technology was used to improve the signal-to-noise ratio and resolution of the seismic data,as a result,the dominant frequency of the seismic data was enhanced from 30 Hz to 50 Hz,and the sand body thickness resolution was enhanced from 10 m to 6 m.On the basis of fine layer control by seismic data,three types of seismic facies models,floodplain,natural levee and point bar,were defined,and the intelligent horizon-facies controlled recognition technology was worked out,which had a prediction error of reservoir thickness of less than 1.5 m.Clearly,the description accuracy of meandering channel sand bodies has been improved.The probability semi-quantitative oiliness identification method of fluid by prestack multi-parameters has been worked out by integrating Poisson’s ratio,fluid factor,product of Lame parameter and density,and other prestack elastic parameters,and the method has a coincidence rate of fluid identification of more than 90%,providing solid technical support for the exploration and development of thin reservoirs in Shengli Chengdao extra-shallow sea oilfield,which is expected to provide reference for the exploration and development of similar oilfields in China.展开更多
软磁复合材料(Soft Magnetic Composites,SMCs)作为高频电力电子器件的核心材料,需同时满足高饱和磁化强度、低损耗及高频稳定性等要求,而传统软磁材料已难以适应这一需求。通过综述近年来SMCs在高性能化方向的研究进展,重点探讨表面处...软磁复合材料(Soft Magnetic Composites,SMCs)作为高频电力电子器件的核心材料,需同时满足高饱和磁化强度、低损耗及高频稳定性等要求,而传统软磁材料已难以适应这一需求。通过综述近年来SMCs在高性能化方向的研究进展,重点探讨表面处理、粉末优化、制备工艺创新及高频损耗机制解析等关键技术。研究表明,通过复合涂层纳米化设计(如磷酸盐/有机硅树脂包覆、六方氮化硼绝缘层)、增材制造驱动的成分调控(如中熵合金激光3D打印)、温压与低温氮化工艺优化,可显著提升SMCs的电阻率、磁导率及高频适应性。此外,多物理场耦合模型与涡流-磁滞损耗机制的深化研究为工程应用提供了理论支撑。未来需突破超薄绝缘涂层、环保制备技术及GHz频段损耗预测等挑战,以推动SMCs在5G通信、新能源等领域的更高效应用。展开更多
基金The Ministry of Science and Technology Special Foundation Grant No.217Harbin Important Science Technology Foundation Grant No.0014211044
文摘Traditional magneto-electric vibration sensors and servo accelerometers have severe shortcomings when used to measure vibration where low frequency components predominate.A low frequency characteristic extension for velocity vibration sensors is presented in this paper.The passive circuit technology,active compensation technology and the closed- cycle pole compensation technology are used to extend the measurable range and to improve low frequency characteristics of sensors.Thses three types of low frequency velocity vibration sensors have been developed and widely adopted in China.
基金Supported by the China National Science and Technology Major Project(2016zx05006)Sinopec Program for Science and Technology Development(P15156,P15159)。
文摘The meandering channel deposit of the upper member of Neogene Guantao Formation in Shengli Chengdao extra-shallow sea oilfield is characterized by rapid change in sedimentary facies.In addition,affected by surface tides and sea water reverberation,the double sensor seismic data processed by conventional methods has low signal-to-noise ratio and low resolution,and thus cannot meet the needs of seismic description and oil-bearing fluid identification of thin reservoirs less than 10 meters thick in this area.The two-step high resolution frequency bandwidth expanding processing technology was used to improve the signal-to-noise ratio and resolution of the seismic data,as a result,the dominant frequency of the seismic data was enhanced from 30 Hz to 50 Hz,and the sand body thickness resolution was enhanced from 10 m to 6 m.On the basis of fine layer control by seismic data,three types of seismic facies models,floodplain,natural levee and point bar,were defined,and the intelligent horizon-facies controlled recognition technology was worked out,which had a prediction error of reservoir thickness of less than 1.5 m.Clearly,the description accuracy of meandering channel sand bodies has been improved.The probability semi-quantitative oiliness identification method of fluid by prestack multi-parameters has been worked out by integrating Poisson’s ratio,fluid factor,product of Lame parameter and density,and other prestack elastic parameters,and the method has a coincidence rate of fluid identification of more than 90%,providing solid technical support for the exploration and development of thin reservoirs in Shengli Chengdao extra-shallow sea oilfield,which is expected to provide reference for the exploration and development of similar oilfields in China.
文摘软磁复合材料(Soft Magnetic Composites,SMCs)作为高频电力电子器件的核心材料,需同时满足高饱和磁化强度、低损耗及高频稳定性等要求,而传统软磁材料已难以适应这一需求。通过综述近年来SMCs在高性能化方向的研究进展,重点探讨表面处理、粉末优化、制备工艺创新及高频损耗机制解析等关键技术。研究表明,通过复合涂层纳米化设计(如磷酸盐/有机硅树脂包覆、六方氮化硼绝缘层)、增材制造驱动的成分调控(如中熵合金激光3D打印)、温压与低温氮化工艺优化,可显著提升SMCs的电阻率、磁导率及高频适应性。此外,多物理场耦合模型与涡流-磁滞损耗机制的深化研究为工程应用提供了理论支撑。未来需突破超薄绝缘涂层、环保制备技术及GHz频段损耗预测等挑战,以推动SMCs在5G通信、新能源等领域的更高效应用。
