摘要： Capacitors are widely used in pulsed magnet power supplies to reduce ripple voltage, store energy, and decrease power variation. In this study, DC-link capacitors in pulsed power supplies were investigated. By deriving an analytical method for the capacitor current on the H-bridge topology side, the root-mean-square value of the capacitor current was calculated, which helps in selecting the DC-link capacitors. The proposed method solves this problem quickly and with high accuracy. The current reconstruction of the DC-link capacitor is proposed to avoid structural damage in the capacitor’s current measurement, and the capacitor’s hot spot temperature and temperature rise are calculated using the FFT transform. The test results showed that the error between the calculated and measured temperature increases was within 1.5 ◦C. Finally, the lifetime of DC-link capacitors was predicted based on Monte Carlo analysis. The proposed method can evaluate the reliability of DC-link capacitors in a non-isolated switching pulsed power supply for accelerators and is also applicable to film capacitors.

摘要： The Shanghai Laser Electron Gamma Source (SLEGS, located in BL03SSID) beamline at the Shanghai Synchrotron Radiation Facility (SSRF) is a laser Compton scattering (LCS) gamma source used for the investigation of nuclear structure, which is in extensive demand in fields such as nuclear astrophysics, nuclear cluster structure, polarization physics, and nuclear energy. The beamline is based on the inverse Compton scattering of 10640 nm photons on 3.5 GeV electrons and a gamma source with variable energy by changing the scattering angle from 20° to 160°. γ-rays of 0.25–21.1 MeV can be extracted by the scheme consisting of the interaction chamber, coarse collimator, fine collimator, and attenuator. The maximum photon flux for 180° is approximately 10^7 photons/s at the target at 21.7 MeV, with a 3-mm diameter beam. The beamline was equipped with four types of spectrometers for experiments in (γ,γ’), (γ,n), and (γ,p α). At present, nuclear resonance fluorescence (NRF) spectrometry, flat efficiency neutron detector (FED) spectrometry, neutron time-of-flight (TOF) spectrometry, and light-charged particle (LCP) spectrometry methods have been developed.

摘要： One-neutron stripping process between 6Li and 209Bi was studied at 28, 30, and 34 MeV using the in-beam γ-ray spectroscopy method. The γ-γ coincident analysis clearly identified two γ-rays feeding the ground and long-lived isomeric states, which were employed to determine the cross section. The one-neutron stripping cross sections were similar to the cross sections of complete fusion in the 6Li+209Bi system, but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region. A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping process in 6Li. The calculations indicated that the first excited state of 5Li is critical in the actual one-neutron transfer mechanism, and the valence proton of 209Bi can be excited to the low-lying excited state in (6Li, 5Li) reaction, unlike in the (d,p) reaction.

摘要： The heavy-water-moderated molten-salt reactor (HWMSR) is a newly proposed reactor concept, in which heavy water is adopted as the moderator and molten salt dissolved with fissile and fertile elements is used as the fuel. Issues arising from graphite in traditional molten-salt reactors, including the positive temperature coefficient and management of highly radioactive spent graphite waste, can be addressed using the HWMSR. Until now, research on the HWMSR has been centered on the core design and nuclear-fuel cycle to explore the viability of the HWMSR and its advantages in fuel utilization. However, the core safety of the HWMSR has not been extensively studied. Therefore, we evaluate typical accidents in a small modular HWMSR, including fuel-salt inlet temperature-overcooling and -overheating accidents, fuel-salt inlet flow-rate decrease, heavy-water inlet temperature-overcooling accidents, and heavy-water inlet mass flow-rate decrease accidents, based on a neutronics and thermal-hydraulics coupled code. The results demonstrated that the core maintained safety during the investigated accidents.

摘要： 目的/意义　将主动健康”理念融入公共图书馆健康信息服务研究，探究公共图书馆健康信息服务模式提升策略，实现用户从“被动健康”到主动健康”转变。方法/过程　结合用户健康信息行为、期望现状以及健康信息关注程度影响因素，运用5W1H分析法，构建公共图书馆健康信息服务模式。结果/结论　从“主体”“内容”“对象”“方式”“场所”5个层面进行公共图书馆健康信息服务模式构建。

摘要： 本文介绍了一种超疏水性三聚氰胺（ME）海绵（ME-g-PLMA），该海绵通过高能辐射诱导的原位共价接枝长烷基十二烷基甲基丙烯酸酯（LMA）到ME海绵上，以实现高效的油水分离。所得的ME-g-PLMA海绵具有优良的孔隙结构，具有超疏水性（水接触角为154°）和超亲油性，可吸收高达自身重量66-168倍的各类油脂。所得到的ME-g-PLMA海绵可以通过连接泵连续分离水面上的浮油，或者通过重力驱动装置分离水下的浮油。ME-g-PLMA海绵在长期浸泡在不同的腐蚀性溶液中，多次反复吸油后，也能保持其高疏水性。所得改性ME-g-PLMA海绵具有优异的分离性能，在溢油清理方面具有巨大的潜力。

摘要： BL02U2 of the Shanghai Synchrotron Radiation Facility (SSRF) is a surface diffraction beamline with a photon flux of 5.5 × 1012 photons/s at 10 keV and a beam size of 160×80 µm2 at the sample site. It is dedicated to studying surfaces (solid–vacuum, solid–gas) and interfaces (solid–solid, solid–liquid, and liquid–liquid) in nanoscience, condensed matter, and soft matter systems using various surface scattering techniques over an energy range of 4.8–28 keV with transmission and reflection modes. Moreover, BL02U2 has a high energy resolution, high angular resolution, and low beam divergence, which can provide excellent properties for X-ray diffraction experiments, such as grazing incident X-ray diffraction, X-ray reflectivity, crystal truncation rods, and liquid X-ray scattering. Diversity of in-situ environments can also be provided for the samples studied. This paper describes the setup of the new beamline and its applications in various fields.

摘要： 本文介绍了一种适用于超宽带（UWB）的具有双带缺口特性的共面波导（CPW）馈电天线，该天线由一个五角形辐射贴片组成，贴片上有一个倒U形槽和一个改进过的双T形槽。通过采用这些槽，该天线实现了双带宽缺口功能。实验结果表明，该天线的带宽较宽，在3.11-4.09GHz和5.03-5.93GHz有两个陷波区，可有效抑制全球微波接入互操作性（WiMAX）和无线局域网（WLAN）频段内的信号。

摘要： Small-scale measurements of the radon exhalation rate using the flow-through and closed-loop methods were conducted on the surface of a uranium tailing pond to better understand the differences between the two methods.An abnormal radon exhalation behavior was observed, leading to computational fluid dynamics (CFD)-based simulations in which dynamic radon migration in a porous medium and accumulation chamber was considered.Based on the in-situ experimental and numerical simulation results, variations in the radon exhalation rate subject to permeability, flow rate, and insertion depth were quantified and analyzed. The in-situ radon exhalation rates measured using the flow-through method were higher than those measured using the closed-loop method, which could be explained by the negative pressure difference between the inside and outside of the chamber during the measurements. The consistency of the variations in the radon exhalation rate between the experiments and simulations suggests the reliability of CFD-based techniques in obtaining the dynamic evolution of transient radon exhalation rates for diffusion and convection at the porous medium–air interface. The synergistic effects of the three factors (insertion depth, flow rate, and permeability) on the negative pressure difference and measured exhalation rate were quantified, and multivariate regression models were established, with positive correlations in most cases; the exhalation rate decreased with increasing insertion depth at a permeability of 1×10−11 m2. CFD-based simulations can provide theoretical guidance for improving the flow-through method and thus achieve accurate measurements

摘要： 化石燃料的燃烧是我国区域性污染天气形成的重要原因，其主要表现形式是燃煤电厂排出的烟羽。随着遥测和深度学习技术的蓬勃发展，基于遥感影像的语义分割技术也取得了长足进步。针对烟羽狭长的形态特征，本文设计了一个即插即用的多尺度多模板动态条形卷积模块，替代传统的方形卷积；此外，对语义分割模型中的下采样模块加入了空间和通道注意力约束，减少了信息损失。上述工作均已在公开数据集上进行了对比实验和消融实验，实验结果验证了方法的有效性。?????

摘要： 目的/意义 了解我国近十余年新一代智能技术在医疗领域应用的发展概况，为我国智能医疗技术的未来发展提供思路。方法/过程 筛选2000-2023年知网数据库中有关国内医疗智能技术应用的相关文献，使用描述性统计分析和CiteSpace软件绘制知识图谱，进行可视化分析。结果/结论 共纳入289篇文献，发文量整体呈现先稳步增长后趋于平稳的趋势。热点关键词主要有智慧医疗、健康医疗、健康管理等，并主要形成8个聚类集合。未来的研究应加强研究者以及机构间的合作交流，同时需更加注重技术应用中安全隐私、技术监管、人才队伍建设以及技术能耗等方面带来的挑战。

摘要： 目的/意义 分析中老年人电子健康素养现水平的动态变化及其影响因素，探究中老年人电子健康素养的薄弱环节，为提高中老年人电子健康素养水平提供借鉴。方法/过程 采用以线上线下相结合的方式对广州市内505位中老年人进行问卷调查，用统计软件SPSS24.0对调查结果进行分析。结果/结论 中老年人电子健康素养平均得分为33.88±10.92，处于中等水平；其电子健康素养的薄弱环节是健康信息的交互和评判能力不足；个体因素是影响中老年人电子健康素养的首要因素。政府相关部门应加大对中老年人数字健康适老化建设的政策及资金支持；社区应开展“低龄化帮扶老龄化”的助老模式；数字健康APP的设计者应遵从“以中老年人为中心”的适老化改造；中老年人自身不应内化外界的“年龄歧视”。

摘要： 目的：分析2型糖尿病患者中西医特征间的多维交互关系及其对中医辩证的影响。方法：基于真实世界电子病历数据，改进传统关联规则算法，增加尊重度指标筛选出重要的中医证型作为因变量进入Logistic回归算法，分析中西医临床指标与中医证型的关联。结果：本研究共纳入T2DM患者688例，其中气阴两虚证317例，中土雍滞证186例，肝郁气滞证111例，肠道湿热证74例。最终得到关联规则112条，其中包含中医证型的有12条。中土雍滞证与超重/肥胖的关联规则尊重度最大(Respect=0.52)，且超重/肥胖患者的中土雍滞证患病率更高（OR=3.097,P<0.001）。中土雍滞证、合并周围神经病变或合并高血压与超重/肥胖的关联较强(Respect=0.42)。合并糖尿病肾病患者出现气阴两虚证的可能性更大（OR=1.475,P=0.019）。

摘要： 目的/意义 概念验证是加快科技成果转化的重要手段。探究医院图书馆在概念验证中的作用及实现路径，为图书馆服务概念验证、提升概念验证效能提供参考。方法/过程 首先通过文献调研阐述概念验证的影响因素、流程步骤、潜在问题以及对成果转化的影响，接着遵循“前因后果”的逻辑构建概念验证模型，然后结合资源和服务要素论述图书馆的主要作用和衍生作用，根据衍生作用析出对应的图书馆职能，最后围绕相关职能阐明图书馆在概念验证中的实现路径。结果/结论 医院图书馆在概念验证中主要发挥4种作用，分别是激活驱动因素、支持流程推进、化解潜在问题、放大对成果转化的促进作用；围绕馆藏建设、文化建设、协同管理、宣传培训、信息服务与科技评价6种职能促进概念验证实施。

摘要： 随着如今无线局域网（WLAN）技术的发展与普及，在争用共享信道时，CSMA/CA协议性能的好坏对网络吞吐量的高低起着决定性的作用。本文首先分析了互听、不互听以及多BSS条件下CSMA/CA协议的过程，之后基于二维Markov chain模型对CSMA/CA协议的性能指标进行了建模与计算，最后通过分析建模过程提出了该协议当前的不足之处并给出了改进方案。

摘要： 智慧物流是当前物流业实现降本增效目标的关键路径。中国物流行业正积极响应并推动智慧物流的发展。智慧物流已在学术界与实务界得到广泛的关注，本研究以中国知网和中国物流与采购网两个平台作为比较研究对象，并分别代表学术界和实务界，利用BERTopic主题建模方法提取领域主题，对不同数据源维度下的领域主题及其演化进行跟踪，并对两个平台智慧物流的主题及其演化过程进行分析对比，旨在提升智慧物流的地位，促进传统物流行业的转型升级步伐。研究发现，基于不同平台的智慧物流数据主题提取结果及其呈现的知识演化脉络各有侧重；在出现某些重大技术变革或特殊事件时，实务界（CFLP）的响应速度更快，学术界(CNKI)则相对平缓且具有一定的前瞻性。

摘要： 目的/意义 探究我国医学领域阶段性高层次人才特征,为制定人才培养政策、有效发挥我国科技人才作用提供参考。方法/过程 以爱思唯尔公司(Elsevier)2017-2021年“中国高被引学者”榜单为基础,分析医学领域连续5年入选者的分布格局和发展态势。结果/结论 入选“中国高被引学者”的专家主要集中在高校和科研院所,一定程度上与科研资源集聚呈正向关系,临床医学和药学学科(方向)入选人数优势明显,近5年来入选者大多保持了较高的科研产出和研究活跃度。基于分析结果,提出医学领域顶尖人才发展建议。

摘要： ALOHA协议是一种无线无线通信ALOHA协议的分析与仿真设计无线通信ALOHA协议的分析与仿真设计无线通信ALOHA协议的分析与仿真设计网络中的动态自组织路由协议，它能够根据节点的负载状况和网络的拓扑结构来调整其信道访问控制策略。这种动态自组织路由协议可以通过调整信道接入控制策略来提高网络吞吐量，从而有效地克服了传统静态路由协议的缺陷。在实际应用中，ALOHA协议需要解决两个重要的问题：一是如何提高网络吞吐量；二是如何提高数据传输成功概率。本文详细介绍了ALOHA协议，并对其性能进行了仿真分析。

摘要： 随着通信技术的迅猛发展，软件无线电（Software Defined Radio, SDR）作为一种新兴技术，因其灵活性和广泛的应用前景而受到了极大的关注。本文介绍了一种基于国产芯片的软件无线电设备设计，旨在为FM频段的频谱感知与分析提供一种经济有效的解决方案。本设计基于CH32V307VCT6作为核心处理器，结合TEA5767模块实现了频谱扫描与分析，同时具备基础的调频收音机功能，通过1.44寸TFT屏幕提供用户交互界面。通过实际测试，证明了该设计的有效性和实用性，为后续的软件无线电设备开发提供了参考和应用基础。

摘要： 在互动提取过程中，说话者选择性地提取目标信息，会导致听者对非目标信息的遗忘，这被称为社会分享型提取诱发遗忘。本研究基于情绪、动机与记忆之间的密切联系，探索在互动提取范式中，情绪效价与情绪动机维度对社会分享型提取诱发遗忘的影响。实验1通过操纵情绪效价与项目类型，考察情绪效价对社会分享型提取诱发遗忘的影响；实验2通过操纵积极情绪效价下的动机维度与项目类型，考察积极情绪动机维度对社会分享型提取诱发遗忘的影响。结果发现，在积极情绪(和中性情绪)条件下会产生社会分享型提取诱发遗忘，消极情绪条件下则不会；且高趋近动机积极情绪条件下的社会分享型提取诱发遗忘效应量大于低趋近动机积极情绪。以上结果为了解情绪效价及相应的动机维度对社会分享型提取诱发遗忘的影响提供了实证依据，在社会互动任务中检验了情绪与动机影响记忆表现的关键作用。