分类: 物理学 >> 核物理学 提交时间: 2023-09-11
摘要: The NaI:Tl scintillator is an innovative material for dual-gamma-ray and neutron detection with a low 6Li concentration. To achieve real-time n/ discrimination, a zero-crossing time comparison algorithm based on trapezoidal pulse shaping was developed. The algorithm can operate efficiently at low sampling rates and was implemented on a single-probe portable digital n/ discriminator based on a feld-programmable gate array (FPGA). The discriminator and NaI:Tl,6Li detector were tested in a neutron-gamma mixed field produced by an 241Am-Be neutron source to evaluate the performance of the algorithm. The Figure of Merits (FoM) was measured as 2.88 at a sampling rate of 50 MHz, indicating that the discriminator with its embedded algorithm has a promising n/ discrimination capability. Efficient discrimination at sampling rates of 40 and 25 MHz demonstrates that the capability of this method is not limited by low sampling rates.
分类: 物理学 >> 核物理学 提交时间: 2023-09-11
摘要: 本工作制作了一套由快发光塑料闪烁体耦合快光电倍增管组成的塑料闪烁体飞行时间探测器的样机,通过皮秒脉冲激光测试了探测器的时间性能,旨在为将来的 HIAF-HFRS 飞行时间探测器作预研。对于两种不同尺寸的塑闪探测器,通过改变激光的光斑大小、频率、光强和位置等各项参数来模拟真实束流的情况,并使用 CAEN-DT5742 数字化仪以及 Mesytec-MCFD16+MTDC32 电子学系统进行了系统的测试。使用聚焦激光照射在塑闪中心位置时,小尺寸 (7 cm7 cm) 塑闪探测器的 ToF 分辨最好可达 8 ps;小-大 (26 cm10 cm) 塑闪探测器的 TOF 分辨最好可达到 12 ps。在改变激光各项参数后,得到的响应时间分辨为 1016 ps 和 1946 ps。测试结果表明,所得到的 ToF 分辨满足 HFRS 束线的时间分辨性能要求,为飞行时间探测器的优化奠定了基础。
分类: 护理学 >> 护理学 提交时间: 2023-09-11
摘要: 摘要:随着现代医学模式的改变,临床护理路径已经被广泛应用于临床护理工作中,通过对临床护理路径的应用,不仅可以使患者得到良好的治疗效果,同时还可以提升患者的满意度,对于患者的病情恢复具有重要意义。在妇产科中应用临床护理路径,不但可以提 1 升患者的治疗效果,同时还可以使患者对医院的满意度得到提升。基于此,本文首先分析了妇产科中应用临床护理路径的重要性,并提出了临床护理路径在妇产科中应用的具体措施。通讯作者:安菁,Email:156114300@qq.com
分类: 物理学 >> 核物理学 提交时间: 2023-09-11
摘要: Gamma-ray polarimetry is a new and prospective tool for studying various extreme high-energy celestial objects and is of great significance for the development of astrophysics. With the rapid development of microsatellite technology, the advantages in space exploration are becoming increasingly apparent. Therefore, in this paper, we conducted a simulation study on a soft gamma-ray polarimeter for a microsatellite in space. Here, we proposed a unique design structure for the polarimeter based on the microsatellite design concept and the Compton scattering principle. And then, the detailed Monte Carlo simulations using mono-energetic gamma-ray linear polarization sources and the Crab-like sources in the energy range of 0.1-10 MeV with full consideration of the orbital background were performed. The simulation results show that the polarimeter can exhibit excellent polarization detection performance. The modulation factor is 0.800.01, and the polarization angles are accurate within an error of 0.2 at 200 keV for on-axis incidence. For the Crab-like sources for on-axis incidence, the polarization degrees are consistent with the set values within the error tolerance, the modulation factor is 0.760.01, and the minimum detectable polarization reaches 2.4% at 3 for an observation time of 106 seconds. In addition, the polarimeter has recoil electron tracking, imaging, and powerful background suppression at a large field of view (2 sr). The polarimeter designed can meet the requirements of a space-soft gamma-ray polarization detector very well and has a bright research prospect.
分类: 护理学 >> 护理学 提交时间: 2023-09-11
摘要: 睡眠是人类正常的生理活动,正常的睡眠可以清除积聚在中枢神经系统中的潜在神经毒性废物,并且能够促进突触的可塑性从而促进记忆和学习。睡眠和觉醒的相互转换是通过大脑中各种神经递质和内源性促进睡眠的物质的相互作用来实现的,它们受昼夜节律和内部环境的稳态调节。但随着现代生活节奏的加快,熬夜、饮食不规律等各种不良生活习惯所导致的昼夜颠倒,身体内外环境紊乱而引发的失眠愈发普遍,这直接影响到了人的生理和心理健康状况。研究表明,耳穴压豆疗法,能够刺激相应穴位,疏通全身气血运行,调节脏腑功能,对失眠有较好疗效,且操作简便, 易于掌握,无不良反应。从卫生经济学角度来看,耳穴压丸法符合社会需求,同时不会为患者增加过重的医疗开支,适合在各种医疗机构,甚至是社区医院、农村卫生院中开展。
分类: 护理学 >> 护理学 提交时间: 2023-09-11
摘要: 壮医药物竹罐疗法为壮医特色外治疗法之一,疗效确切,操作简便,无毒副作用,具有简、便、验、捷等优势,临床广泛用于内、外、妇科,治疗关节炎疗效突出。现代医家更是在古人的基础上对该疗法的操作规范进行了深入研究,期望能够更准确地把握疾病本质,合理运用该疗法。本文从近年来关于壮医竹罐疗法治疗文献入手,对文献进行梳理总结,旨在探讨该疗法在临床治疗的研究进展。
分类: 物理学 >> 核物理学 提交时间: 2023-09-11
摘要: A trigger system has been designed and implemented for the HIRFL-CSR external target experiment (CEE), the spectrometer for studying nuclear matter properties with heavy ion collisions in the GeV energy region. The system adopts master-slave structure and serial data transmission mode using optical fiber to deal with different types of detectors and long-distance signal transmission. The trigger logic can be accessed based on command register and controlled by a remote computer. The overall field programmable gate array (FPGA) logic can be flexibly reconfigured online to match the physical requirements of the experiment. The trigger system has been tested in beam experiment. It is demonstrated that the trigger system functions correctly and meets the physical requirements of CEE.