Design and Implementation of Education-Oriented Instance Message Software System

在日益加剧的市场竞争中，某公司力求开发出一款针对教育行业细分市场的即时通讯软件，以满足教育行业细分市场客户的沟通需求。产品形态可打造成具有统一地址簿、单点登录、通讯及应用等功能的实名制系统，可针对不同角色提供不同的应用解决方案。用户以实名的方式存在于虚拟的网络环境中，用户不仅可以使用即时消息、收发文件等普通即时通讯软件的功能，还可以享受其他的增值服务。 基于以上目的，本文以某面向教育通讯软件系统为背景，描述了项目的需求分析、设计与实现的过程。通过该系统的建设能够从技术方面讨论该软件的设计与实现过程。 论文首先在充分调研选题背景和国内外研究现状的基础上，从某面向教育通讯软件的实际需求出发，说...In the growing market competition, a company develop an instance message software for educational market to meet customer's communication need. The software could be designed as a real name system, which has address list, unified certification, communication and other applications. The software could provide special solution according to different roles of the system. User would use real name in v...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201223024

Water-quality impact assessment on open-sea reclamation planning——A case study of Fujian Province,China

基于开阔海域围填海的特殊性,已有的水质影响评价定量方法较难直接应用。本文通过水动力因子分析确定污染物扩散条件,根据水质现状、围填面积和规划利用方式确定水质压力。基于上述污染物扩散条件和水质压力参数,以水质影响程度等级作为评价结果,设计了半定量评价矩阵对福建省湾外围填海规划的10个围填区进行了水质影响评价。评价结果表明:其中有1个围填区水质影响程度较大,其余围填区水质影响程度均在中等以下。此外,水质影响程度评价结果可同时为湾外围填海规划决策者提供相应的决策依据。案例应用表明:该半定量方法可以推广应用于决策型的、影响机制复杂、不确定性较强的人类活动的水质影响评价。The marine reclamation is one of the major kinds of coastal projects,which may cause the negative impacts on water quality.Due to the particularity of reclamation in open-sea,the existing quantitative methods of water-quality impact assessment are inapplicable.In this study,an assessing matrix based on the pollutant diffusion condition and water quality pressure was developed to predict the water-quality impacts of 10 reclamation blocks in the planning of reclamation outside bays in Fujian Province.In which,the diffusing condition of pollutants is determined by the hydrodynamic analysis,and the pressure on water quality is determined by the analyzing current water quality,reclamation areas and their functions.The application of this semi-quantitative matrix,the results showed that the water quality impact of one reclamation area is comparative high,while others have lower impacts.These results of different impact degrees of water quality provided a supporting tool for the environmental management decision-making.The successful application in the case study also reveals that the semi-quantitative water-quality impact assessment methodology can be applied to those with the complicated impact mechanism,highly uncertain and decision-supportive anthropogenic impacts.国家海洋公益项目(200905005-06);2011年度“厦门大学基础创新科研基金”(中央高校基本科研业务费专项资金)项目(2011121008

Micromechanical properties of shear stiffening gel reinforced ethylene-vinyl acetate foam

In previous study, a novel composite foam that possesses cushioning properties is developed by incorporating shear stiffening gel (SSG) into Ethylene-vinyl (EVA) foam. In this work, uniaxial compression is used to obtain the mechanical properties of the proposed material under static loading. The test results demonstrate the additive SSG could effectively enhance the energy absorption capacity. With the aid of in-situ Scanning Electron Microscope (SEM), two characteristics, the homogeneous microstructural morphology and phase separation between SSG and EVA, are found that played dominant roles in the improvement of cushioning properties

Protective performance of shear stiffening gel-modified foam against ballistic impact: Experimental and numerical study

As one of the most widely used personal protective equipment (PPE), body armors play an important role in protecting the human body from the high-velocity impact of bullets or projectiles. The body torso and critical organs of the wear may suffer severe behind-armor blunt trauma (BABT) even though the impactor is stopped by the body armor. A type of novel composite material through incorporating shear stiffening gel (STG) into ethylene-vinyl acetate (EVA) foam is developed and used as buffer layers to reduce BABT. In this paper, the protective performance of body armors composed of fabric bulletproof layers and a buffer layer made of foam material is investigated both experimentally and numerically. The effectiveness of STG-modified EVA in damage relief is verified by ballistic tests. In parallel with the experimental study, numerical simulations are conducted by LS-DYNA (R) to investigate the dynamic response of each component and capture the key mechanical parameters, which are hardly obtained from field tests. To fully describe the material behavior under the transient impact, the selected constitutive models take the failure and strain rate effect into consideration. A good agreement between the experimental observations and numerical results is achieved to prove the validity of the modelling method. The tests and simulations show that the impact-induced deformation on the human body is significantly reduced by using STG-modified EVA as the buffering material. The improvement of protective performance is attributed to better dynamic properties and more outstanding energy absorption capability of the composite foam. (c) 2023 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/)

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

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^