Design and Implementation of Exchange Rate Analysis Software base on Data Mining Techniques

当前，全球主要金融市场特别是外汇交易市场已经实现了网络化和计算机化。金融市场每天都在数据库中积累下海量的交易数据。如何利用计算机对这些数据进行有效的分析和研究，并加以利用，是金融企业急需解决的问题。随着数据挖掘理论和商业智能技术的发展和成熟，它们为设计金融数据分析工具软件提供了良好的理论支持和技术支撑。数据挖掘也称为知识发现，是从大量的数据中提取出可信、新颖、有效并能被人理解的模式的高级处理过程。目前数据挖掘领域成熟的技术有很多，如关联规则、神经网络、遗传算法等等。本文探讨了利用数据挖掘技术对金融市场中的外汇汇率进行分析的解决方法和实现技术。论文研究的主要内容与成果包括三个方面： (1)讨论...Today, major global financial markets, especially the foreign exchange market have realized networking and computerization. The financial markets accumulate massive transaction data in database every day. How to use computers to analyze and study these data efficiently is the urgent problem that financial enterprises need to solve. Along with data mining theory and business intelligence technologi...学位：工程硕士院系专业：信息科学与技术学院计算机科学系_计算机技术学号：X200622102

Available Energy Analysis of New Double-capillary Tube Refrigeration System of Refrigerator-freezer

A new double - capillary tube refrigeration system for refrigerator - freezers was proposed. A capillary tube was added between the two evaporators in the fresh and frozen food storage chests to raise the evaporation temperature of the fresh food, and reduce the heat exchange temperature difference and the available energy loss. PR equation was adopted to calculate the thermodynamic properties of the refrigerants, and the available energy analysis for the vapor compression refrigeration cycle was programmed to calculate thermodynamic performances of the new and the conventional refrigeration cycle of therefrigerator - freezer. The calculation results show that the available energy efficiency of the conventional refrigeration cycle of the refrigerator - freezer is 21.20% and 20.57%, respectively when the refrigerant is R12 and R134a while that of the double - capillary tube refrigeration cycle of the refrigerator - freezer is 23.97%and 23.44%, respectively. By comparison, the available energy efficiency of the new refrigeration system increases by 13.07% and 13.95%, respectively

新型装配式钢框架结构建筑体系研究与应用

近些年,我国开始大力推进装配式钢结构建筑的应用,国家和地方政府也相继推出多个政策来鼓励和促进其应用和推广,因此,装配式钢结构建筑体系得到了广泛的发展。东南大学、浙江东南网架股份有限公司、北京津西赛博思建筑设计有限公司以及天津大学等研究机构和企业依托"十三五"国家重点研发计划项目"新型框架钢结构体系建筑产业化技术与示范",针对当前装配式钢框架体系建筑在应用中存在的梁柱外露、工业化程度低、施工复杂等问题,提出多腔柱钢框架-支撑、多腔体框架-钢板组合剪力墙、新型框架-核心筒以及钢管混凝土组合异形柱框架结构等新型钢框架结构建筑体系,并对新体系建筑中的关键技术开展深入研究和工程应用,提高了我国装配式钢结构建筑的技术和应用水平,有利地促进了我国建筑工业化的发展

Expert consensus on multimodal MRI sequence parameters and scanning protocols for studies of brain and cognitive development in school‑aged children

当代多模态MRI技术的迅速发展，为精准刻画儿童青少年脑发育规律与个体差异、揭示 脑发育异常疾病的神经机制，提供了重要影像研究工具，带来了儿童脑发育影像学这一脑科学前沿方 向。然而，面向学龄儿童（6~18 岁）的高质量多模态 MRI 脑影像序列参数设置与扫描采集极具挑战 性，严重阻碍了国内脑发育相关影像研究的开展与推广。为此，国内相关领域的多家权威机构和专家 团队，依托科技部科技创新2030&ldquo; 脑科学与类脑研究&rdquo;重大项目&ldquo;中国学龄儿童脑智队列&rdquo;计划，通过 调研全国 30余家机构 MRI设备现况，以及国际大型儿童脑发育队列研究序列参数的优缺点，共同制 订了《面向学龄儿童脑智发育研究的多模态MRI脑影像序列参数与扫描规范专家共识》，以期规范国 内不同规模、不同类型队列相关脑发育影像研究中的序列参数设计与扫描操作，提升儿童脑影像扫描成功率与影像质量，以及结果可比性与稳定性，推动我国儿童脑智发育基础与临床研究的整体进步。</p

Amplitude analysis of the decays D0 → π+π−π+π− and D0 → π+π−π0π0*

Using e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, a joint amplitude analysis is performed on the decays D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η). The fit fractions of individual components are obtained, and large interferences among the dominant components of the decays D0 → a1(1260)π, D0 → π(1300)π, D0 → ρ(770)ρ(770), and D0 → 2(ππ)S are observed in both channels. With the obtained amplitude model, the CP-even fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are determined to be (75.2 ± 1.1stat. ± 1.5syst.) % and (68.9 ± 1.5stat. ± 2.4syst.)%, respectively. The branching fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are measured to be (0.688 ± 0.010stat. ± 0.010syst.)% and (0.951 ± 0.025stat. ± 0.021syst.)%, respectively. The amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0 → 4π when used to determine the CKM angle γ(φ3) via the B− → DK− decay

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^