一种单片机控制的防盗报警器

本文利用８０３１单片机设计了一种自动拨ＢＢ机的防盗报警器。它的特点是：智能化、简单、实用，提高了报警器使用的可靠性。经装配调试，符合设计要求。     

γ射线BGO探头研制

为钢厂连铸液位监测研制了一种 BGO探头 ,它由一个 D2 5× 2 5 BGO晶体、一支 CR1 1 0光电倍增管和在探头内的电子线路构成。其工作点电压选约 90 0 V,输出脉冲幅度 1 0 V,脉冲宽度 5μs,本底计数 :5 0± 7s- 1 。用 1 .6μs V/h伽马射线照射 ,计数 :45 0± 2 1 s- 1 ,长期工作稳定 ,计数无漂移 ,具有防震、抗磁、耐高温等特点     

分布式交互仿真中的电波传播模型研究

针对分布式交互仿真中电波传播的建模与表现方法进行了研究.针对电波传播环境的复杂性,采用了一种将经验模型、半确定半经验模型和确定模型相结合的电波传播模型,并给出了复杂电波传播环境下相关环境信息数据的表达方法.在小区制非可视传播环境中,加速改进了基于SBR的射线跟踪算法,给出了相关的实验,并验证了其有效性.     

KDZ1114—3型矿井地质探测仪应用研究

详细介绍了KDZ1114—3型矿井地质探测仪在矿井超前探测、采空区探测、地质异常体界面分析等方面的应用情况及其推广价值。     

月亮阴影与羊八井二期阵列的角分辨

利用１９９５年１０月至１９９７年９月间采集到的数据，西藏空气簇射二期阵列以１４．３σ，１３．６σ的显著性观测到了７ＴｅＶ及３０ＴｅＶ宇宙线的月亮阴影；利用最大似然法定出阵列相应的角分辨分别为０．８８＋０．０５°－０．０３°，０．４２＋０．０４°－０．００°，地磁场分别使月亮阴影偏向南０．０４°±０．０８°，０．０４°±０．０６°，由此可推知该阵列对簇射方向定向的系统误差小于０．１°．     

硝酸铒与2-(二苯基氧化膦甲基)喹啉氮氧化物配合物的晶体结构

合成了硝酸铒与新双官能团含磷萃取剂２－（二苯基氧化膦甲基）喹啉氮氧化物的配合物．元素分析表明，配合物中金属离子与有机配体的比例为１１．用四圆衍射仪测定了配合物的晶体结构．晶体属于三斜晶系，空间群为Ｐ１．晶体学参数ａ＝９．４１２（２），ｂ＝１０．４２１（２），ｃ＝１８．９５２（３），α＝７７．４９（１）°，β＝７８．０７（１）°，γ＝７０．３６（１）°，Ｚ＝２．配合物中有机配体以双齿形式与中心离子配位．金属离子周围的配位水分子已全部被取代     

基于80C51单片机的智能电动小车

采用80C51单片机为控制核心,利用超声波传感器检测道路上的障碍,控制电动小汽车的自动避障,快慢速行驶,以及自动停车,并可以自动记录时间、里程和速度,自动寻迹和寻光功能。整个系统的电路结构简单,可靠性能高。     

Radiation hardness characterization of low gain avalanche detector prototypes for the high granularity timing detector

The high granularity timing detector (HGTD) is a crucial component of the ATLAS phase II upgrade to cope with the extremely high pile-up (the average number of interactions per bunch crossing can be as high as 200). With the precise timing information (σ_t～30 ps) of the tracks, the track-to-vertex association can be performed in the “4-D” space. The Low Gain Avalanche Detector (LGAD) technology is chosen for the sensors, which can provide the required timing resolution and good signal-to-noise ratio. Hamamatsu Photonics K.K. (HPK) has produced the LGAD with thicknesses of 35 μm and 50 μm. The University of Science and Technology of China(USTC) has also developed and produced 50 μm LGADs prototypes with the Institute of Microelectronics (IME) of Chinese Academy of Sciences. To evaluate the irradiation hardness, the sensors are irradiated with the neutron at the JSI reactor facility and tested at USTC. The irradiation effects on both the gain layer and the bulk are characterized by I-V and C-V measurements at room temperature (20 ℃) or ?30 ℃. The breakdown voltages and depletion voltages are extracted and presented as a function of the fluences. The final fitting of the acceptor removal model yielded the c-factor of 3.06×10?16 cm?2, 3.89×10?16 cm?2 and 4.12×10?16 cm?2 for the HPK-1.2, HPK-3.2 and USTC-1.1-W8, respectively, showing that the HPK-1.2 sensors have the most irradiation resistant gain layer. A novel analysis method is used to further exploit the data to get the relationship between the c-factor and initial doping density.     

Design and optimization of transparent scattering solar concentrator based on SiO2 aerogel

Scattering solar concentrators (SSCs), an important component of transparent/translucent photovoltaic devices, can concentrate large-area sunlight on small-area solar cells while allowing some sunlight to pass through the devices. However, owing to the lack of suitable scattering materials, there have been few reports on SSCs in recent years. In this study, we fabricated SiO₂ aerogel-based SSCs and tested their performances. The photoelectric performance was found to be moderate. Additionally, the results demonstrated excellent transmittance and color rendering index, which meet the lighting requirements of the windows. A Monte Carlo ray tracing program was developed to simulate an SSC and analyze the fate of all photons. We also analyzed the multiple scattering mechanism in SSCs that damages the photoelectric efficiency of a device via theoretical simulation. Finally, we proposed an anisotropic scattering device that can increase the primary scattering and suppress multiple scattering, resulting in excellent photoelectric efficiency.     

中国“乡村旅游重点村”空间分布格局及影响因素

乡村旅游是实现国家乡村振兴战略的重要方面,全国“乡村旅游重点村”可为实施乡村振兴战略提供新契机,该文通过分析全国“重点村”空间分布的影响因素,研究全国“乡村旅游重点村”的特点.该文以全国首批“乡村旅游重点村”中的314个村为研究对象,运用ArcGIS空间分析法探讨全国“重点村”空间分布特征,采用地理探测器法等方法系统分析.研究结果表明：1) 全国“乡村旅游重点村”空间分布区域差异显著,总体结构呈“南北均衡和中部凹陷”的空间分布特征,旅游资源以自然景观为主,人文景观为辅.2) 全国“乡村旅游重点村”空间分布具有空间自相关性,在特定区域空间上呈数量规模集聚,空间密度呈“双核中心,次级中心零星分布”态势,冷热分区与集聚核心中心高度吻合.3) 全国“乡村旅游重点村”点集系统空间分形结构特征明显,空间分布无显著的标度区,分形结构较为简单.4) 影响全国“乡村旅游重点村”空间分布的核心要素主要是旅游资源禀赋、区域社会经济以及区域基础设施条件等.研究结果印证了314个中国“乡村旅游重点村”作为乡村旅游培育重点,具有典型性和代表性.