Critical behavior in the itinerant ferromagnet SmMn_(2)Ge_(2)

Transition metal and rare earth intermetallics have been a fertile playground for research of various quantum states.We report detailed magnetic studies on Sm Mn_(2)Ge_(2),an anisotropic itinerant magnet with multiple magnetic phases.The critical behavior of the ferromagnetic phase transition is investigated by employing the modified Arrott plot with the Kouvel-Fisher method.The critical temperature TCis determined to be around 342.7 K with critical exponents ofβ=0.417 andγ=1.122,and the interaction function is found to be J(r)~r^(-4.68),suggesting the coexistence of long-range and shortrange magnetic interactions.Our results contribute to the understanding of complex magnetism in Sm Mn_(2)Ge_(2),which may provide fundamental guidance in future spintronic applications.

Giant Volume Magnetostriction Caused by Itinerant Electron Metamagnetic Transition and Pronounced Invar Effects in La(Fe_xSi_(1-x))_(13) Compounds

A first-order itinerant electron metamagnetic (IEM) transition above the Curie temperature Tc for ferromagnetic La(Fe_xSi_1-x)13 compounds has been confirmed by applying magnetic field. The volume change just above T_C for x=0.88 is huge of about 1.5%, which is caused by a large magnetic moment induced by the IEM transition. These compounds have a possibility for practical applications as giant magnetostrictive materials. Pronounced Invar effects bring about a negative thermal expansion below TC, closely correlated with the negative mode-mode coupling among spin fluctuations.

CrAlGe:An itinerant ferromagnet with strong tunability by heat treatment

We present a comprehensive investigation on CrAlGe and realize that it is an itinerant ferromagnet with strong tunability of the Curie temperature T_(C)and the spontaneous momentμ_(0)depending on annealing heat treatment.While the value of T_(C) was previously reported to be 80 K withμ_(0)≈0.41μB,in this work the two quantities attain values as high as 170 K and 0.66μ_(B),respectively.Heat treatment does not cause changes of the lattice parameters and symmetry,but results in a slight narrowing of the Bragg peaks.The strong tunability of the itinerant ferromagnetism indicates significantly tunable hybridization between the Cr 3d electrons and the conduction bands,in agreement with the dominant Cr–Al/Ge bonds of this compound.Further tuning along the same line towards even stronger or weaker itinerant ferromagnetism promises an interesting follow-up to clarify the localized-itinerant duality of the 3d electrons in this compound.

Itinerant Topological Magnons in SU (2) Symmetric Topological Hubbard Models with Nearly Flat Electronic Bands

We show that a suitable combination of flat-band ferromagnetism,geometry and nontrivial electronic band topology can give rise to itinerant topological magnons.An SU(2) symmetric topological Hubbard model with nearly flat electronic bands,on a Kagome lattice,is considered as the prototype.This model exhibits ferromagnetic order when the lowest electronic band is half-filled.Using the numerical exact diagonalization method with a projection onto this nearly flat band,we can obtain the magnonic spectra.In the flat-band limit,the spectra exhibit distinct dispersions with Dirac points,similar to those of free electrons with isotropic hoppings,or a local spin magnet with pure ferromagnetic Heisenberg exchanges on the same geometry.Significantly,the non-flatness of the electronic band may induce a topological gap at the Dirac points,leading to a magnonic band with a nonzero Chern number.More intriguingly,this magnonic Chern number changes its sign when the topological index of the electronic band is reversed,suggesting that the nontrivial topology of the magnonic band is related to its underlying electronic band.Our work suggests interesting directions for the further exploration of,and searches for,itinerant topological magnons.

Resistance Anomaly and Linear Magnetoresistance in Thin Flakes of Itinerant Ferromagnet Fe_(3)GeTe_(2)

Research interests in recent years have expanded into quantum materials that display novel magnetism incorporating strong correlations,topological effects,and dimensional crossovers.Fe_(3)GeTe_(2)represents such a twodimensional van der Waals platform exhibiting itinerant ferromagnetism with many intriguing properties.Up to date,most electronic transport studies on Fe_(3)GeTe_(2)have been limited to its anomalous Hall responses while the longitudinal counterpart(such as magnetoresistance)remains largely unexplored.Here,we report a few unusual transport behaviors on thin flakes of Fe_(3)GeTe_(2).Upon cooling to the base temperature,the sample develops a resistivity upturn that shows a crossover from a marginally-ln T to a-T^(1/2)dependence,followed by a lowertemperature deviation.Moreover,we observe a negative and non-saturating linear magnetoresistance when the magnetization is parallel or antiparallel to the external magnetic field.The slope of the linear magnetoresistance also shows a nonmonotonic temperature dependence.We deduce an anomalous contribution to the magnetoresistance at low temperatures with a scaling function proportional-HT^(1/2),as well as a temperature-independent linear term.Possible mechanisms that could account for our observations are discussed.

Quality of life and influencing factors between local and itinerant populations during the COVID-19 pandemic

Objective:To determine the difference in quality of life and its influencing factors between local and itinerant populations in Nanjing during COVID-19.Methods:The quality of life questionnaire,which was based on the Brief Scale of WHO Quality of Life and redesigned by the research group,was used to randomly investigate 1150 people in 5 districts of Nanjing.Results:A total of 1112 valid questionnaires were collected(local population,n=558;itinerant population,n=554).The quality of life of the itinerant population was significantly lower than the local population.The itinerant population scores in physiology,psychology,social relationships,and environment were lower than the local population(all P values<0.05).COVID-19 had a greater impact on the itinerant population than on the local population,especially in medical assistance,enjoyment of life,and interpersonal relationships(all P values<0.05).Conclusion:The itinerant population had a lower quality of life than that of the local population during the prevention and control pandemic of COVID-19,thus more social support and help is warranted.

Around China in 80 Days (Ⅲ) On the road with itinerant Americans

ＡｒｏｕｎｄＣｈｉｎａｉｎ８０Ｄａｙｓ（Ⅲ）ＯｎｔｈｅｒｏａｄｗｉｔｈｉｔｉｎｅｒａｎｔＡｍｅｒｉｃａｎｓＢｙＢＩＬＬＢＲＯＷＮＮＥＡＲｄｕｓｋｗｅｓｉｄｌｅｄｕｐａｌｏｎｇｓｉｄｅａＴｉｂｅｔａｎｃｏｎｖｏｙａｎｄｐｒｅｐａｒｅｄｔｏｂｅｄｄｏｗｎ...

Stories of Itinerant Workers in Beijing

IANGXiangfenisacheerful19-year-oldpeasantgirl.Sheiscontentwithherlife,andfeelsasthoughshehasbeenlivingunderaluckystareversinceshegraduatedfromjuniormiddleschool.ShecomesfromasmallvillageinShandongProvince.HerwholefamilystilllivesinShandong,butWangnow...

基于场动力理论的巡回指导教师专业发展机制研究

巡回指导教师是特殊教育学校教师角色变革与转型的重要产物,对其专业发展的关注是推动我国融合教育高质量发展的必然要求。基于场动力理论,采用主题分析法,深描巡回指导教师专业发展的困境、动力与路径,构建其专业发展机制的逻辑解释框架。研究结果表明,巡回指导教师数量少,在专业发展中面临融合教育理念推进困难、外部教育环境复杂、多重角色冲突难协调等困境。因此,巡回指导教师需要形成基于职业认同、自我效能感及专业发展意愿的内生动力,并在外界环境的支持下,通过自主学习和反思、积极参与科研与实践形成专业发展的内部通路;通过积极接受培训、参与专业发展共同体等实践活动,形成专业发展的外部通路,进而实现其可持续发展。

创建“枫桥式人民法庭”的路径探析

新时代“枫桥经验”被赋予了鲜明的时代特征,即“矛盾不上交、平安不出事、服务不缺位”。作为司法审判系统的末梢,人民法庭处在司法服务群众的最前沿,在践行“枫桥经验”中尚存在诸多问题,主要表现为诉源治理工作开展不够深入、非诉讼纠纷化解资源分散、统一协作机制运行不畅、缺乏长效制度机制及经费保障、参与基层社会治理的边界存在模糊地带等。究其根源,主要是部分人民法庭运用“枫桥经验”开展工作的观念意识、路径方法没有与时俱进所致。为更好地发挥人民法庭厚植党的执政根基、能动司法为民服务的作用,应转变司法服务理念,坚持源头预防为先、非诉机制挺前,不断完善矛盾纠纷多元化解工作机制。

Gate-tunable Berry curvature in van der Waals itinerant ferromagnetic Cr_(7)Te_(8)

The anomalous Hall effect(AHE)that associated with the Berry curvature of occupied electronic states in momentum-space is one of the intriguing aspects in condensed matter physics,and provides an alternative for potential applications in topological electronics.Previous experiments reported the tunable Berry curvature and the resulting magnetization switching process in the AHE based on strain engineering or chemical doping.However,the AHE modulation by these strategies are usually irreversible,making it difficult to realize switchable control of the AHE and the resultant spintronic applications.Here,we demonstrated the switchable control of the Berry-curvature-related AHE by electrical gating in itinerant ferromagnetic Cr_(7)Te_(8)with excellent ambient stability.The gate-tunable sign reversal of the AHE can be attributed to the redistribution of the Berry curvature in the band structure of Cr_(7)Te_(8)due to the intercalation-induced change in the Fermi level.Our work facilitates the applications of magnetic switchable devices based on gate-tunable Berry curvature.

革新意识与思想觉醒——俄国巡回展览画派的早期实践活动与审美图景

俄国19世纪最大的民主艺术协会——巡回展览协会(画派),成立于1870年,一直存续至1923年,由坚持现实主义原则的俄国画家群体创立,在俄国艺术史上打开了一个前所未有的崭新局面,让俄国艺术在此历史时期迸发出蓬勃的生命力。巡回展览画派诞生的前身和最初形态由“十四人反叛”事件开始,这群皇家美术学院的优等生们在艺术创作的反思和觉醒中奋起,从早期以“合作社”互助的形式凝聚到后来转变和发展为以画派协会的机制运转,期间进行了不同形式和规模的组织实践尝试。巡回展览画派作为艺术团体,它的运作模式、创作的革新意识和美学思想在不断探索的过程中逐渐形成了独特的实践路径和审美图景,串联起一条具备非凡内涵的发展脉络。

上海市闵行区颛桥社区巡回医疗门诊药品利用和可及性分析

目的回顾性分析上海市闵行区颛桥社区2019~2022年巡回医疗门诊患者处方数据,评价历年巡回医疗门诊药品利用及常用药品可及性情况,以进一步满足社区患病人群用药需求,提升家庭医生团队服务能力。方法通过闵行区颛桥社区医疗卫生信息系统,提取并分析2019~2022年巡回医疗门诊患者医保类型、疾病分布、药品费用、用药种类、用药频度等数据。结果2019~2021年,闵行颛桥社区巡回医疗处方数量占总处方30%以上;2022年因新冠疫情影响,和2021年相比,占比下降40.84%。2019~2022年,门诊处方次均药费区间155.36~178.54元;高血压、冠心病、糖尿病、睡眠障碍等慢病占总就诊人次49%以上;2019~2022年比较,医保类型(含普通医保、其他居民、医疗互助帮困、无保老人、其他类型)处方人次构成比(χ^(2)=1881.168,P=0.000)、疾病类型(高血压、冠心病、糖尿病、睡眠障碍、其他疾病)处方人次构成比(χ^(2)=3255.282,P=0.000)差异有统计学意义。颛桥社区巡回医疗门诊患者疾病构成比在不断变化;单品种金额排序前10位药品品种、DDDs排序前10位药品品种处于不断变化之中。2019年,单品种DDDs排序前10位药品中,DDC值区间0.33~2.93元,2020年为0.26~2.93元,2021年和2022年均小于6.0元。结论巡回医疗门诊患者的用药需求和社区药品供给在不断调整变化,但巡回医疗已成为社区患者重要就诊方式。新服务模式有利于居民和家庭医生保持长期签约服务关系,有利于慢病健康管理,在实践中显示积极作用。颛桥社区巡回医疗门诊4年来的药品DDC值维持较低水平,人民群众的药品可及性得到提升。

装备计量巡检保障要求浅议

装备计量巡检保障是装备使用维护阶段的重要工作。为更好地理解和执行新版国家军用标准要求,首先介绍了标准中新增的使用维护计量保障要求,并结合装备计量保障发展趋势,着眼于将标准规定的日常装备计量保障要求落实到装备计量巡检保障工作中,重点讨论了新时期装备计量巡检保障的基本要求、信息化要求和能力建设要求。

巡回护士加强眼睛护理干预对患者手术中眼睛的保护效果

目的分析巡回护士眼睛护理干预对患者手术中眼睛的保护效果。方法随机将2023年6月1日至2023年6月30日130例手术患者随机分为对照组、观察组各65例,其中对照组采用常规眼睛护理干预,而观察组则采用巡回护士眼睛护理干预,对比护理后两组患者的眼睛并发症发生率、保护眼睛操作时间及手术护理的满意度。结果相比对照组,观察组眼睛畏光、流泪、异物感、结膜充血、角膜损伤等并发症发生率更低(P<0.05);观察组患者在保护眼睛操作时无需涂抹、擦拭眼膏,贴敷前虽然要耗费一定的折叠时间,但揭除敷料方便,总操作时间更短(P<0.05);观察组护理满意度更高(P<0.05)。结论手术中巡回护士加强患者眼睛护理,可以降低患者眼睛损伤,患者舒适度更高,术中眼部护理满意度高。

书香盈室:民国时期家庭巡回文库的创设及运行

家庭巡回文库是民国时期公共图书馆创设的一种馆外流通服务形式,具体由公共图书馆根据家庭阅读需求进行图书配送,并定期开展巡回流通服务。家庭巡回文库作为家庭文库与巡回文库的糅合体,其创设及运行不仅对民国时期的家庭教育事业有着潜滋暗长之效,即便对当今公共图书馆的家庭阅读推广工作亦有着重要借鉴价值。

明清史家建构柳华按闽史事的取向及其动因

明正统年间浙闽赣边界地区“矿盗”问题严重,地方政府治理疲软。柳华巡按福建后,塞矿坑、设隘门、编保甲、抚流民,有效地治理了“矿盗”问题。在他离任后,地方官员与宦官集团科敛无度,最终酿成邓茂七之乱,事后又推卸责任于柳华,导致柳华含冤被杀。不同史籍由于各自相异的史源及撰述目的,形成了对柳华按闽史事不同的叙事。其中,《嘉靖延平府志》的历史书写带有强烈的史家主体性,其历史叙事的取舍和人物形象的塑造与史实差距较大。

巡回护士掌握天玑机器人辅助脊柱手术设备操作技能的学习曲线

目的:探讨手术室巡回护士掌握天玑机器人辅助脊柱手术设备操作技能所需的最少操作例数,为制定配合此类手术护士的资格准入标准及技能培训提供依据。方法:9名手术室巡回护士以脊柱模具为工具独立进行机器人设备模拟操作,每人共计操作16例。记录其设备准备及导线连接耗时、图像采集及传输耗时、手术置钉规划耗时、机器人运行耗时4个评价指标,并使用累积和分析法分别绘制个体学习曲线与总体学习曲线。结果:个体学习曲线斜率开始降低的操作例数为3~11例,总体学习曲线斜率开始降低的操作例数为8例。4个操作阶段中学习曲线开始降低的例数分别为第5例、第8例、第11例、第3例。结论:巡回护士要掌握天玑机器人辅助脊柱手术的设备操作技能至少需要操作8例。其中,图像采集及传输部分与手术置钉规划部分是操作技能的难点,需要在今后的培训中引起重视。

Itinerant ferromagnetism entrenched by the anisotropy of spin-orbit coupling in a dipolar Fermi gas

We investigate the itinerant ferromagnetism in a dipolar Fermi atomic system with the anisotropic spin–orbit coupling(SOC),which is traditionally explored with isotropic contact interaction.We first study the ferromagnetism transition boundaries and the properties of the ground states through the density and spin-flip distribution in momentum space,and we find that both the anisotropy and the magnitude of the SOC play an important role in this process.We propose a helpful scheme and a quantum control method which can be applied to conquering the difficulties of previous experimental observation of itinerant ferromagnetism.Our further study reveals that exotic Fermi surfaces and an abnormal phase region can exist in this system by controlling the anisotropy of SOC,which can provide constructive suggestions for the research and the application of a dipolar Fermi gas.Furthermore,we also calculate the ferromagnetism transition temperature and novel distributions in momentum space at finite temperature beyond the ground states from the perspective of experiment.

检察机关排除非法证据的模式重构——以《刑事诉讼法》第56条为视角

《刑事诉讼法》第56条无差别地赋予公检法三机关在各自诉讼阶段排除非法证据的义务,但从实践面向出发,审前阶段的非法证据排除缺乏规范性与实效性,在操作层面也异变为检警重塑证据的把关程序。因此,有必要以检察机关为切入视角,探索审前适用非法证据排除规则的差别化程序。立足于我国检察制度的内部职能划分,派驻检察与巡回检察是符合政策导向的特色检察制度,建立“以派驻检察为重点,以巡回检察为抓手”的审前非法证据排除制度有诸多益处,尤其能够在发现非法证据线索、完善诉侦衔接、实现检察机关内部制约等方面发挥重要作用。以此为出发点重构检察机关排除非法证据的模式,可以打破适用于审判阶段证据排除的传统模式,重释其功能定位与规制重点,创新性地激活审前非法证据排除程序,扩张我国非法证据排除规则的适用场域。