Design and Implementation of Mobile Game Community on Android Platform

在移动终端性能的不断提高和移动互联网的不断普及，SNS社区以及不再只停留在电脑上，逐渐的走进了手机里，与以往的社区相比，手机社区有更好的实时性，以及能够更方便的提供LBS服务功能。目前每个社区都集成了各自的游戏，社区通过游戏将用户联系在一起，使游戏成为人际交往的一部分。随着游戏社区功能的不断丰富，移动游戏社区会有一个更加美好的前景。 以市场调研的需求分析结果为依据，本文描述了基于android平台手机游戏社区的设计与实现。该客户端分为九大功能模块，包括用户，游戏，社区，下载，消息，活动，动态，礼包、设置。 本文首先分析了手机游戏社区项目的背景以及国内外同类产品的发展现状，阐述了项目的意义，...In the mobile terminal performance and the continuous improvement of the mobile Internet's growing popularity, SNS community and no longer just stay on the computer, gradually into the phone, compared with the past, community, community mobile phone has better real-time, and can be more convenient provide LBS service functions. At present, each community integrated their own game, the user communi...学位：工学硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323201

Synthesis and Characterization of Lanthanide Complexes Involving Cyclopentadienyl and N-phenylzohydroxamic Acid

合成了以茂基和 N-苯基苯甲异羟肟酸为配体的一系列新型稀土金属有机配合物 Cp2 Ln L( Cp=η5-C5H5;Ln=Sm,Nd,Gd,Dy,Ho,Er,Yb Pr;L=C6H5CONOC6H5)。产物经元素分析、IR和 MS表征A series of new mixed-ligand organolanthanide complexes involving cyclopentadienyl and N-phenylbenzohydroxamic acid ligands Cp 2LnL(Cp=η 5-C 5H 5; Ln=Nd,Sm,Gd,Dy,Ho,Er,Yb Pr; L=C 6H 5CONOC 6H 5) have been synthesized. All the complexes were characterized by elemental analysis, IR and MS spectra.安徽省自然科学基金 ( 0 0 0 46 5 0 9);; 安徽省教育厅项目基金 ( 2 0 0 0 j10 90

二维CrI₃晶体的磁性测量与调控

长久以来, 人们普遍相信低维(三维以下)长程序无法在任何有限的温度下稳定存在. 这是因为温度带来的热涨落会破坏由各向同性的短程相互作用支撑的低维体系中对称性破缺的有序态. 然而, 这个定理同时要求相互作用是短程且各向同性的. 事实上很多低维体系是不满足这两个限定条件的. 比如二维CrI3晶体中由于强各向异性的存在, 其磁子色散关系中有禁带存在. 当温度值远远低于该禁带宽度时, 磁子无法被温度大规模激发, 该二维体系中的长程磁序也就不会被破坏. 人们已经利用不同的手段对二维原子层厚度CrI3中的磁序进行了表征, 并且做了大量尝试来调控该体系中的磁性结构. 本文主要综述了CrI3二维磁性材料的生长、磁性结构测量和磁性结构调控, 并对下一阶段的工作从基础凝聚态物理研究以及电子工程应用角度做出展望. For a long time, it has been generally acknowledged that low-dimensional (lower than three-dimensions) long-range orders cannot stay stable at any finite temperature, because temperature-induced fluctuations can destroy any long-range orders in low-dimensional systems supported by isotropic short-range interactions.However, this theorem requires that the interaction must be short-range and isotropic. In fact, many low-dimensional systems do not meet these two requirements. For example, due to the strong anisotropy in two-dimensional CrI3 crystals, there is a band gap in the magnon spectrum. When the excitation energy from temperature is much lower than the band gap, the magnet on cannot be excited by temperature on a large scale,and the long-range magnetic order in the two-dimensional system will not be destroyed. Various methods have been used to characterize the magnetic order in atomically thin CrI3 crystals, and a lot of attempts have been made to manipulate the magnetic structure in the system. Focusing on CrI3, in this article we review the recent studies on growth, magnetic structure measurement and manipulation of two-dimensional magnetic materials,and also discuss the prospects for the next phase of research from the perspectives of basic condensed matter physics research and electronic engineering applications

2000–2010年中国典型陆地生态系统实际蒸散量和水分利用效率数据集

蒸散是陆地生态系统水分循环和能量平衡的关键过程,水分利用效率是反映生态系统碳水循环间耦合关系的重要指标,二者在生态学、农学、水文学、气候学等多个学科中均具有重要的应用价值。涡度相关法被认为是现今唯一能直接测量生物圈与大气间物质与能量交换通量的标准方法,已成为生态系统尺度碳水交换通量观测的主要方法。本文通过整合中国陆地生态系统通量观测联盟(China FLUX)的长期观测数据和中国区域其他观测站点基于涡度相关法发表的文献数据,构建了一套中国典型陆地生态系统实际蒸散量和水分利用效率数据集。本数据集共有实际蒸散量数据记录143条、水分利用效率数据记录96条,涉及5种生态系统类型45个生态系统,时间跨度为2000–2010年。本数据集可以为陆地生态系统碳水循环、生态系统管理和评估、全球变化等相关领域的研究提供数据支持

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^

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