The time resolution of a radiography system for high-Z materials shall be at least 1 ns, hence the need of a time measurement system with a resolution of about 100 ps. In this paper, a Time Measurement Evaluation Boar...The time resolution of a radiography system for high-Z materials shall be at least 1 ns, hence the need of a time measurement system with a resolution of about 100 ps. In this paper, a Time Measurement Evaluation Board (TMEB) is developed to meet the need. It is based on the time-to-digital converter of ACAM TDC-GP2. Test results show an overall time resolution of 81 ps in detecting cosmic-rays with a plastic scintillator.展开更多
VME system of the Resistive Plate Chamber (RPC) electronics for the Daya Bay Reactor Neutrino Experiment is described in this paper. A 9U VME RPC trigger module (RTM) is designed to process coincidence signals coming ...VME system of the Resistive Plate Chamber (RPC) electronics for the Daya Bay Reactor Neutrino Experiment is described in this paper. A 9U VME RPC trigger module (RTM) is designed to process coincidence signals coming from front end cards (FECs), to generate local triggers and send them to FECs to select the hit data from RPC detector, to report trigger information to a master trigger system and receive cross triggers from the master trigger system. Another 9U VME readout module is designed to collect data from all FECs, to send out configurations to FECs, and to transmit collected hit data to the data acquisition system via VME bus. Test results prove that the VME system is capable of treating a maximum data rate (2.2 MB·s-1 ), without data loss.展开更多
结核病是一种严重威胁人类健康的传染性疾病,2020年,世界卫生组织(World Health Organization,WHO)指出全球新发结核病患者约为996万,其中结核病死亡人数约141万。中国是结核病的高发国家之一,约占全球结核病总数的8.5%[1]。近年来,耐...结核病是一种严重威胁人类健康的传染性疾病,2020年,世界卫生组织(World Health Organization,WHO)指出全球新发结核病患者约为996万,其中结核病死亡人数约141万。中国是结核病的高发国家之一,约占全球结核病总数的8.5%[1]。近年来,耐多药结核病(multidrug-resistant tuberculosis,MDR-TB)的出现,给结核患者的治疗带来了新的难题[2]。MDR-TB患者治疗总周期长,药物不良反应多,治愈率较低,严重影响患者的生活质量[3]。早期的诊断和治疗是改善结核病患者预后的关键环节。结核分枝杆菌(Mycobacterium tuberculosis,MTB)复合群的病原微生物检测方法主要包括培养、涂片镜检、Xpert MTB/RIF检测等[4-7]。展开更多
基金Supported by National Natural Science Foundation of China(Grant No.11005108)
文摘The time resolution of a radiography system for high-Z materials shall be at least 1 ns, hence the need of a time measurement system with a resolution of about 100 ps. In this paper, a Time Measurement Evaluation Board (TMEB) is developed to meet the need. It is based on the time-to-digital converter of ACAM TDC-GP2. Test results show an overall time resolution of 81 ps in detecting cosmic-rays with a plastic scintillator.
基金Supported by National Natural Science Foundation of China (Grant No.10890091)Guangdong Province and Chinese Academy of Sciences’Comprehensive Strategic Cooperation Projects (No.2011A090100015)
文摘VME system of the Resistive Plate Chamber (RPC) electronics for the Daya Bay Reactor Neutrino Experiment is described in this paper. A 9U VME RPC trigger module (RTM) is designed to process coincidence signals coming from front end cards (FECs), to generate local triggers and send them to FECs to select the hit data from RPC detector, to report trigger information to a master trigger system and receive cross triggers from the master trigger system. Another 9U VME readout module is designed to collect data from all FECs, to send out configurations to FECs, and to transmit collected hit data to the data acquisition system via VME bus. Test results prove that the VME system is capable of treating a maximum data rate (2.2 MB·s-1 ), without data loss.
