Design and Implementation of Mine Enterprise Asset Management System

资产密集型企业对企业资产管理的状况，直接关系到企业在市场上的核心竟争力。我国大量的矿山企业属于老企业，其设备管理体制与观念较为落后，在设备管理工作中存在很多问题。建立科学完善的设备管理及维修体制，改进矿山设备的管理与维修工作，是保证矿山生产经营目标的实现和企业能否持续稳定协调地发展的基本条件。企业资产管理系统是实现企业资产管理信息化的重要手段，通过开发和实施EAM系统，除了可以提高设备利用率，获得高产出、低消耗以外，还可以在更广泛的意义上，对企业的产品品质、生产安全性、节约能源、环境保护等提供重要的保障。 本文首先对矿山企业资产管理的现状以及存在的问题进行了详细的分析，然后在此基础上，对矿山...To asset-intensive enterprise, the asset management impacts directly the core competency of the enterprise in market. Many of Mine Enterprises in our state belong to old enterprises, the equipment management system and conception are more backward, and there are a lot of problems in equipment management. Establishing scientific and perfect equipment management and maintenance systems and making ...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201223052

Spring Characteristics of Benthic Dinoflagellates in the East Coastal Beach of Xiamen Island

20 0 0年春季 ,对厦门岛东海岸黄厝沙滩底栖甲藻的种类组成和时空分布进行了调查 .发现初春甲藻数量少 ,而春末夏初数量显著增多 ,由春初的 0～ 2 0个 / 10 0 0 g湿砂增加到春末夏初的几千个 / 10 g湿砂 ,相差 3个数量级以上 ;Amphidinium britanicum和 Adenoides eludens为春季优势种 ;Gyrodinium viridescense和 Peridinium quinquecorne在 5月份数量明显增多 ,与温度升高以及底栖藻类各类群总量增加有密切关系 ;底栖甲藻的总细胞密度和主要优势种的细胞密度呈现由高潮带向中、低潮带增加的趋势 .还探讨了超声波处理在野外底栖甲藻定量研究中的重要意义In this study, the species compositions and the temporal and spatial distribution of sand dwelling dinoflagellates in the intertidal zone of Huangcuo Beach, Xiamen Island, were investigated from March to May. It was revealed that the total cell density increased from early March to May, with a variation of 3 order of magnitudes in cell richness; Amphidinium britannicum and Adenoides eludens were two dominant species in the spring, however Gyrodinium viridescence and Peridinium quinquecorne might be abundant in the early summer; the cell density of dominant species inclined from the high tide zone to middle and low tide zone. Finally, the importance of sonification treatment in precise cell enumeration of nature samples was discussed. This is the first report of specialized benthic dinoflagellate study in China.厦门大学校级自选课题资助项目 !( Y0 70 0 3

带有A1N插入层的GaN薄膜的结构及应变研究

利用金属有机化学汽相沉积(MOCVD)法在硅衬底上生长具有AIN插入层的GaN外延膜，采用高分辨X射线衍射(HRXRD)和卢瑟福背散射/沟道(RBS/Channeling)技术研究分析其结构和应变性质。从RBS＜0001＞沟道谱可知，该外延膜具有良好的结晶品质，χ_(min)＝2.5％。利用不同方位角上XRD摇摆曲线测量，可得出GaN(0001)面与Si(111)面之间的夹角β＝1.379°。通过对GaN(0002)和GaN(10(1-bar)5)衍射面的θ-2θ扫描，可以得出GaN外延膜在垂直方向和水平方向的平均弹性应变分别为-0.10%±0.02％和0.69％±0.09％。通过对{10(1-bar)0}面内非对称轴RBS角扫描可得出由弹性应变引起的四方畸变e_T在近表面处为0.35％±0.02％。外延膜弹性性质表明GaN膜在水平方向具有张应力(e~〃＞0)、在垂直方向具有压应力(e~⊥＜0)，印证了XRD的结果。四方畸变是深度敏感的，通过对不同深度的四方畸变计算可知，A1N插入层下面的GaN外延膜弹性应变释放速度比A1N层上面的GaN层弹性应变释放快，说明A1N层的插入缓解了应变释放速度

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^