The giant magneto-impedance（GMI）effect of amorphous wire was analyzed theoretically.The amorphous wire had strong GMI effect in the stimulation of sharp pulse of 680kHz and18 mV.A pulse generator was designed to pro...The giant magneto-impedance（GMI）effect of amorphous wire was analyzed theoretically.The amorphous wire had strong GMI effect in the stimulation of sharp pulse of 680kHz and18 mV.A pulse generator was designed to provide high frequency pulse to a magnetic impedance（MI）element.The induced voltage on the pickup coil wound on the amorphous wire was sampled and held with a detect circuit using analog switch.A stable magnetic sensor was constructed.A three-dimension micro magnetic field detector was designed with a central controller MSP430F449.High stability and sensitivity were obtained in the MI sensor with the detect circuit.Experiment results showed that the resolution of the detector was 1nT in the full scale of±2 Oe and the detector worked stably from the room temperature to about 80℃.A small ferromagnetic target was detected by the three-dimension detector in laboratory environment without magnetic shielding.The target moving direction was ascertained with the wave shape of axis parallel in that direction.展开更多
在“双碳”愿景下,CCUS(carbon capture, utilization and storage)技术成为我国减少CO_(2)排放、保障能源安全和实现可持续发展的关键手段,而定量评价CO_(2)含量是CCUS技术中亟需解决的问题。本研究基于中子在地层中的扩散理论,分析了...在“双碳”愿景下,CCUS(carbon capture, utilization and storage)技术成为我国减少CO_(2)排放、保障能源安全和实现可持续发展的关键手段,而定量评价CO_(2)含量是CCUS技术中亟需解决的问题。本研究基于中子在地层中的扩散理论,分析了中子反应截面和减速长度等参数定量评价CO_(2)的方法,利用蒙特卡罗方法建立计算模型,模拟快中子在含CO_(2)和CH_(4)地层介质的作用过程,研究快中子散射截面、宏观俘获截面及减速长度等参数与CO_(2)和CH_(4)饱和度的变化关系,结果表明,在一定孔隙度条件下,减速长度相比快中子散射截面和宏观俘获截面在识别CO_(2)和CH_(4)的动态变化灵敏度更高,且区分CH_(4)和CO_(2)混合流体的响应更明显。研究结果为利用D-T中子源和多探测器测井仪定量评价CO_(2)仪器设计和数据处理方法奠定基础,对发展CCUS技术具有重要意义。展开更多
Multi-detector row computed tomography urography (MDCTU) becomes the imaging modality of choice for evaluation of the kidneys and urinary tract. The aim of this study was to discuss and illustrate the role of MDCTU, o...Multi-detector row computed tomography urography (MDCTU) becomes the imaging modality of choice for evaluation of the kidneys and urinary tract. The aim of this study was to discuss and illustrate the role of MDCTU, on a 32-row CT scanner in the evaluation a variety of entities that were frequently associated with microscopic hematuria in adults. This prospective cohort study was performed in the period of August 2013 to October 2014. Fifty positive participants to microscopic hematuria were examined at the radiology department of Alnilin Diagnostic Medical Center and Antalya Medical Center. Computed tomography urography (CTU) scanning was performed using two powerful performances, high speed multi-detector row on 32-row CT scanners (Siemens Healthcare Global, Somatom Emotion Duo Eco). Statistical analysis was done through the standard Statistical Package for the Social Sciences (SPSS Inc., Chicago, IL, USA) version 15 for windows. MDCTU established the correct cause of microscopic hematuria in (44;88%) of participants. In (6;12%) of participants, no cause of hematuria was identified based on the standard of references. The causes of hematuria in (41;82%) participants were diseases in the upper urinary tract, while urinary bladder neoplasms (2;4%) and diverticulum (1;2%) were the causes of hematuria (3;6%) in the lower urinary tract. Thirty two-row MDCTU scanner demonstrated satisfactory results in the investigation of microscopic hematuria, being able to demonstrate a wide spectrum of diseases affecting the urinary tract is the main advantage of the technique.展开更多
基金Supported by the National Natural Science Foundation of China(60874100)
文摘The giant magneto-impedance（GMI）effect of amorphous wire was analyzed theoretically.The amorphous wire had strong GMI effect in the stimulation of sharp pulse of 680kHz and18 mV.A pulse generator was designed to provide high frequency pulse to a magnetic impedance（MI）element.The induced voltage on the pickup coil wound on the amorphous wire was sampled and held with a detect circuit using analog switch.A stable magnetic sensor was constructed.A three-dimension micro magnetic field detector was designed with a central controller MSP430F449.High stability and sensitivity were obtained in the MI sensor with the detect circuit.Experiment results showed that the resolution of the detector was 1nT in the full scale of±2 Oe and the detector worked stably from the room temperature to about 80℃.A small ferromagnetic target was detected by the three-dimension detector in laboratory environment without magnetic shielding.The target moving direction was ascertained with the wave shape of axis parallel in that direction.
文摘在“双碳”愿景下,CCUS(carbon capture, utilization and storage)技术成为我国减少CO_(2)排放、保障能源安全和实现可持续发展的关键手段,而定量评价CO_(2)含量是CCUS技术中亟需解决的问题。本研究基于中子在地层中的扩散理论,分析了中子反应截面和减速长度等参数定量评价CO_(2)的方法,利用蒙特卡罗方法建立计算模型,模拟快中子在含CO_(2)和CH_(4)地层介质的作用过程,研究快中子散射截面、宏观俘获截面及减速长度等参数与CO_(2)和CH_(4)饱和度的变化关系,结果表明,在一定孔隙度条件下,减速长度相比快中子散射截面和宏观俘获截面在识别CO_(2)和CH_(4)的动态变化灵敏度更高,且区分CH_(4)和CO_(2)混合流体的响应更明显。研究结果为利用D-T中子源和多探测器测井仪定量评价CO_(2)仪器设计和数据处理方法奠定基础,对发展CCUS技术具有重要意义。
文摘Multi-detector row computed tomography urography (MDCTU) becomes the imaging modality of choice for evaluation of the kidneys and urinary tract. The aim of this study was to discuss and illustrate the role of MDCTU, on a 32-row CT scanner in the evaluation a variety of entities that were frequently associated with microscopic hematuria in adults. This prospective cohort study was performed in the period of August 2013 to October 2014. Fifty positive participants to microscopic hematuria were examined at the radiology department of Alnilin Diagnostic Medical Center and Antalya Medical Center. Computed tomography urography (CTU) scanning was performed using two powerful performances, high speed multi-detector row on 32-row CT scanners (Siemens Healthcare Global, Somatom Emotion Duo Eco). Statistical analysis was done through the standard Statistical Package for the Social Sciences (SPSS Inc., Chicago, IL, USA) version 15 for windows. MDCTU established the correct cause of microscopic hematuria in (44;88%) of participants. In (6;12%) of participants, no cause of hematuria was identified based on the standard of references. The causes of hematuria in (41;82%) participants were diseases in the upper urinary tract, while urinary bladder neoplasms (2;4%) and diverticulum (1;2%) were the causes of hematuria (3;6%) in the lower urinary tract. Thirty two-row MDCTU scanner demonstrated satisfactory results in the investigation of microscopic hematuria, being able to demonstrate a wide spectrum of diseases affecting the urinary tract is the main advantage of the technique.
