Floquet dynamical quantum phase transitions in transverse XY spin chains under periodic kickings

Floquet dynamical quantum phase transitions(DQPTs),which are nonanalytic phenomena recuring periodically in time-periodic driven quantum many-body systems,have been widely studied in recent years.In this article,the Floquet DQPTs in transverse XY spin chains under the modulation ofδ-function periodic kickings are investigated.We analytically solve the system,and by considering the eigenstate as well as the ground state as the initial state of the Floquet dynamics,we study the corresponding multiple Floquet DQPTs emerged in the micromotion with different kicking moments.The rate function of return amplitude,the Pancharatnam geometric phase and the dynamical topological order parameter are calculated,which consistently verify the emergence of Floquet DQPTs in the system.

Tuning Second Chern Number in a Four-Dimensional Topological Insulator by High-Frequency Time-Periodic Driving

Floquet engineering has attracted considerable attention as a promising approach for tuning topological phase transitions.We investigate the effects of high-frequency time-periodic driving in a four-dimensional(4D)topological insulator,focusing on topological phase transitions at the off-resonant quasienergy gap.The 4D topological insulator hosts gapless three-dimensional boundary states,characterized by the second Chern number C_(2).We demonstrate that the second Chern number of 4D topological insulators can be modulated by tuning the amplitude of time-periodic driving.This includes transitions from a topological phase with C_(2)=±3 to another topological phase with C_(2)=±1,or to a topological phase with an even second Chern number C_(2)=±2,which is absent in the 4D static system.Finally,the approximation theory in the high-frequency limit further confirms the numerical conclusions.

Repeated inoculation with rumen fluid accelerates the rumen bacterial transition with no benefit on production performance in postpartum Holstein dairy cows

Background The dairy cow’s postpartum period is characterized by dramatic physiological changes,therefore imposing severe challenges on the animal for maintaining health and milk output.The dynamics of the ruminal microbiota are also tremendous and may play a crucial role in lactation launch.We aim to investigate the potential benefits of early microbial intervention by fresh rumen microbiota transplantation(RMT)and sterile RMT in postpartum dairy cows.Twelve fistulated peak-lactation dairy cows were selected to be the donors for rumen fluid collection.Thirty postpartum cows were divided into 3 groups as the transplantation receptors respectively receiving 10 L fresh rumen fluid(FR),10 L sterile rumen fluid(SR),or 10 L saline(CON)during 3 d after calving.Results Production performance,plasma indices,plasma lipidome,ruminal microbiome,and liver transcriptome were recorded.After fresh and sterile RMT,we found that the molar proportion of propionic acid was increased on d 7 in the FR and SR groups and the bacterial composition was also significantly changed when compared with the CON group.A similarity analysis showed that the similarities between the CON group and FR or SR group on d 7 were 48.40%or 47.85%,whereas the similarities between microbiota on d 7 and 21 in the FR and SR groups were 68.34%or 66.85%.Dry matter intake and feed efficiency were not affected by treatments.Plasmaβ-hydroxybutyrate concentration in the FR group was decreased and significantly different lipids mainly included phosphatidylcholine and lysophosphatidylcholine containing polyunsaturated fatty acids.Hepatic transcriptomics analysis indicated acutephase response pathways were upregulated in the SR group.Conclusions Our study suggests that RMT can shorten the transition process of the ruminal microbiota of postpartum dairy cows with no benefit on dry matter intake or feed efficiency.Inoculation with rumen fluid may not be a useful approach to promote the recovery of postpartum dairy cows.

Lost Women in Social Transitional Period——A Comparative Study of the Tragic Fate of Sister Carrie and Guo Haizao

Sister Carrie and Dwelling depict two heroines who share similarities in many aspects. They all live in the social transitional period and suffer a lot. This paper will make a comparison about the two ladies' tragic fates and aims to investigate the impact on females brought about by the social transition.

Empirical Research on the Factors of Chinese City Growth in the Transitional Period

Based on the definition of the concept of city growth, the paper mainly discussed the factors which impact the growth of Chinese cities in the transitional period by selecting the proportion of city construction land area to the area of the city X1(%), green coverage ratio of the built up area X2(%), the ratio of personnel involved in the secondary industry X3(%), the GDP per capita X4(×104)and other 43 indicators, by relying on the relevant data from China Urban Statistical Yearbook(2008), applying SPSS statistical software and by applying the Factor Analysis and Regression Analysis. The results show that the factors which affect the city growth have four major groups, namely economic and institutional factors, location factors, environmental factors and social cultural services and functions. Among the factors which affect Chinese city growth, the general budgetary expenditures and the general budgetary revenues of local public finance are the most important factors. The general budgetary expenditures of local finance, the general budgetary revenues, the lands of urban construction and other 12 factors obtained by gradually excluding method can be used to present the coefficient of city growth.

Transition Periods Between Sea Ice Concentration and Sea Surface Air Temperature in the Arctic Revealed by an Abnormal Running Correlation

This study used the synthetic running correlation coefficient calculation method to calculate the running correlation coefficients between the daily sea ice concentration(SIC) and sea surface air temperature(SSAT) in the Beaufort-Chukchi-East Siberian-Laptev Sea(BCEL Sea), Kara Sea and southern Chukchi Sea, with an aim to understand and measure the seasonally occurring changes in the Arctic climate system. The similarities and differences among these three regions were also discussed. There are periods in spring and autumn when the changes in SIC and SSAT are not synchronized, which is a result of the seasonally occurring variation in the climate system. These periods are referred to as transition periods. Spring transition periods can be found in all three regions, and the start and end dates of these periods have advancing trends. The multiyear average duration of the spring transition periods in the BCEL Sea, Kara Sea and southern Chukchi Sea is 74 days, 57 days and 34 days, respectively. In autumn, transition periods exist in only the southern Chukchi Sea, with a multiyear average duration of only 16 days. Moreover, in the Kara Sea, positive correlation events can be found in some years, which are caused by weather time scale processes.

Topological phase transition in cavity optomechanical system with periodical modulation

We investigate the topological phase transition and the enhanced topological effect in a cavity optomechanical system with periodical modulation.By calculating the steady-state equations of the system,the steady-state conditions of cavity fields and the restricted conditions of effective optomechanical couplings are demonstrated.It is found that the cavity optomechanical system can be modulated to different topological Su–Schrieffer–Heeger(SSH)phases via designing the optomechanical couplings legitimately.Meanwhile,combining the effective optomechanical couplings and the probability distributions of gap states,we reveal the topological phase transition between trivial SSH phase and nontrivial SSH phase via adjusting the decay rates of cavity fields.Moreover,we find that the enhanced topological effect of gap states can be achieved by enlarging the size of system and adjusting the decay rates of cavity fields.

Chinese Thoughts on domain on the value of standard during the period of social transition

values occupy an important position in the lives of the people, almost all the joy, happiness, sadness, unfortunately are related with the values. It pervades all aspects of social life, reflects the contradictions and conflicts of the various aspects. While Chinese society is undergoing a transformation of the special period, Social value orientation of instability makes further thought and exploration,in order to get a judgement conform to social development and human interests of social value standard.

A model of local labor market regulation of China in the transition period

With the establishment of labor market of China, market is playing a more and mare important role in allocation of human resources. However, with the transition of economy in China and industrial upgrading in recent years, many labor problems have occurred which do harm to the sustainable development of local economy. The paper researches on the labor market issues of China from the perspective of local labor market regulation. Firstly, it reviews the theories of local labor market regulation. And then the main components of local labor market regulation of China are identified and the evaluation index system is established. The results of analysis of the calculated output show that （1） the local labor market regulation of China has an obvious character of gradient distribution geographically and decreases gradually from east to west; （2） of all the regulations, the regulation of the development of human capital has the most significant impact on local economy currently which is followed by the regulation of labor relation and the regulation of market participation. As to the regulation of social security, it has no Significant impact on the development of local economy.

Last train timetable optimization for metro network to maximize the passenger accessibility over the end-of-service period

Purpose-This study aims to improve the passenger accessibility of passenger demands in the end-ofoperation period.Design/methodology/approach-A mixed integer nonlinear programming model for last train timetable optimization of the metro was proposed considering the constraints such as the maximum headway,the minimum headway and the latest end-of-operation time.The objective of the model is to maximize the number of reachable passengers in the end-of-operation period.A solution method based on a preset train service is proposed,which significantly reduces the variables of deciding train services in the original model and reformulates it into a mixed integer linear programming model.Findings-The results of the case study of Wuhan Metro show that the solution method can obtain highquality solutions in a shorter time;and the shorter the time interval of passenger flow data,the more obvious the advantage of solution speed;after optimization,the number of passengers reaching the destination among the passengers who need to take the last train during the end-of-operation period can be increased by 10%.Originality/value-Existing research results only consider the passengers who take the last train.Compared with previous research,considering the overall passenger demand during the end-of-operation period can make more passengers arrive at their destination.Appropriately delaying the end-of-operation time can increase the proportion of passengers who can reach the destination in the metro network,but due to the decrease in passenger demand,postponing the end-of-operation time has a bottleneck in increasing the proportion of passengers who can reach the destination.

西太平洋中中新世转型的天文轨道周期特征

中中新世气候转型是一次深刻的全球降温事件,地球各圈层,包括大气圈、水圈、生物圈、岩石圈、冷圈均发生了显著的变化,对理解新生代全球气候突变具有重要的借鉴意义。西太平洋GC18沉积柱样完整记录了中中新世15~11 Ma的沉积记录。本研究基于该柱样精确的年代学框架,开展了岩芯地球化学扫描.

新入职护士过渡期不同阶段职场适应的真实体验

目的探索新入职护士在过渡期不同阶段职场适应的工作体验,了解其在护理岗位适应过程中面临的各种压力、情感体验及行为形成,进一步探索并优化新入职护士培训方案的相关内容。方法本研究采用现象学研究方法,于2023年3-6月在西安交通大学第一附属医院对20名新入职护士进行半结构式深入访谈,并使用Colaizzi 7步分析法对访谈内容进行整理分析。结果提炼得出4个主题和9个亚主题,分别为职业认知(入职1个月)(工作环境不熟悉、角色转化困难、职业认同困扰)、学习适应(2~3个月)(岗位能力不足、自我否定、)、融入环境(4~6个月)(缺乏专科知识、缺乏组织归属感、)、职业胜任(7~12个月)(预警和应对突发事件能力不足、岗位不确定性所致的焦虑)。结论新入职护士过渡期的规范化培训对其职业适应及职业发展至关重要,护理管理者可通过了解新护士过渡期不同阶段职场适应的工作体验,优化培训方案,增加新护士职业认同、心理健康的相关培训,帮助新护士尽早适应临床工作。

塔里木盆地F_(Ⅰ)17走滑断裂北段奥陶纪差异变形机制

为明确走滑断裂对碳酸盐岩油气成藏的作用,基于三维地震资料,分析F_(Ⅰ)17走滑断裂北段的发育特征与构造变形过程,结合地质建模,开展走滑断裂形成及演化的砂箱物理模拟。研究区内的F_(Ⅰ)17走滑断裂可分为南、北2段,南段为近北东—南西走向,主要发育雁列式断裂,奥陶纪一间房组整体以隆升为主,垂向上的变形幅度较大;北段为近北北东—南南西走向,主要发育线性走滑断裂,在奥陶纪一间房组变形微弱,局部地区可见地层微幅度下掉。砂箱物理模拟实验结果表明:线性走滑断裂的主位移带上会形成一系列隆起带,而走向偏转的走滑断裂在南段形成一系列隆起带,在北段则表现为地层下掉;在同一应力条件下,走滑断裂初始走向的差异会导致断裂受力发生变化,进而影响其演化过程。F_(Ⅰ)17走滑断裂南段的压隆段应力更加集中,局部裂缝和溶洞更发育,油气更为富集,油气勘探效果优于北段。

近百年中国历史创造中的传统与创新

近百年来中国之所以能够成就民族复兴、国家富强的历史伟业,根本原因就在于中国共产党和中国人民持续推进中华文明优秀传统的继承与创新。在民族振兴和国家富强进程中不断彰显中国共产党所长期坚持的主体性与创造性,不仅坚持以中国化时代化的马克思主义指导中国革命、建设和改革,而且在创造、创新的基础上推进观念、制度等各方面的创优发展,从而形成了具有世界新型文明属性的中国式现代化道路。而在现阶段出现多制共存的“过渡时期”文明的新常态,决定了新型社会主义文明将与其他文明在竞争与合作中形成人类命运共同体,这将是世界历史“过渡时期”的人类命运共同体文明,这也是中华文明对世界和人类未来发展的新贡献。

NSICU过渡期患者家属需求现况调查及影响因素分析

目的调查神经外科重症监护室(NSICU)过渡期患者家属需求现状,并分析其影响因素,为开展下一步的干预措施提供理论依据。方法采用便利抽样法选取2022年11月至2023年4月该院收治的NSICU过渡期患者家属115例作为研究对象。采取一般资料调查问卷、ICU过渡期患者家属需求量表、ICU转出患者家属迁移应激量表分别对患者家属进行调查。结果115例患者家属平均ICU过渡期患者家属需求量表得分为(100.17±8.38)分,与ICU转出患者家属迁移应激量表总分呈正相关,差异有统计学意义(P<0.05)。有无照顾经验、患者入住NSICU方式、迁移应激水平为NSICU过渡期患者家属需求的影响因素,差异均有统计学意义(P<0.05)。结论NSICU过渡期患者家属需求水平较高,医护人员应对患者家属有无照顾经验、患者入住NSICU方式、迁移应激等因素实施个体化干预,以满足患者家属的需求。

基于MS(2)-AR-TVTP模型的I_(BD)波动周期非对称性和持续性分析

国际干散货运输市场源于国际贸易的衍生需求,受世界经济的影响,是一个典型的周期性市场。选取1999年11月~2021年12月的波罗的海干散货运价指数(I_(BD))月度数据,在检验序列平稳性的基础上,确定最优滞后长度,构建两区制的时变转换概率马尔科夫转换自回归模型,分析I_(BD)波动周期的持续时间、转换拐点和非对称性等主要特征。研究结果表明:模型能有效拟合I_(BD)波动周期的主要特征,周期平均持续时间为33.7个月,自2008年9月之后呈缩短态势,上升期和下降期交互更频繁;I_(BD)波动周期具有非对称性,周期内上升期持续时间比下降期长,I_(BD)维持上升期更具有稳定性。周期性特征结果可为干散货航运业造船投资和市场经营提供决策依据。

围产期母体营养调控对犊牦牛生长发育、血清生化及免疫功能的影响

本研究基于高寒牧区牦牛产业母犊培育现状,旨在探究围产期母体营养均衡供给与早期断奶的营养调控方式对犊牛生长发育、血清生化及免疫功能的影响,为牦牛高效养殖提供科学基础。研究选取18头健康、体重相近、胎次为2~4次、预产期相近的妊娠后期麦洼牦牛,随机分为放牧对照组(GF)、营养供给组(SF)、早期断奶组(SW)3个组(n=6),GF组牦牛产前及产后阶段均于天然牧场自然放牧,SF组牦牛在产前30 d至产后90 d按妊娠后期、泌乳早期营养需要以“精料+青干草+放牧”方式给予营养均衡供给,SW组牦牛在营养均衡供给基础上,于产后60 d对犊牛进行早期断奶处理。对GF、SF、SW组牦牛所产犊牛初生重、90 d体重及体尺指标进行测定,并采集犊牛90日龄血清样本,分析不同母体营养调控方式下犊牦牛血清生化、生长相关激素分泌及免疫功能差异。结果表明,SF和SW组犊牛的初生重显著高于GF组(P<0.05);90日龄时,SF和SW组犊牦牛的体重、体高以及胸围均显著高于GF组(P<0.05),SW与SF组之间犊牛体重、体尺无显著差异(P>0.05)。与GF组相比,SF和SW组犊牛血清葡萄糖(GLU)、球蛋白(GLB)、胆固醇(CHO)浓度显著上升(P<0.05);SF组TP水平显著高于GF组(P<0.05)。生长相关激素方面,SF和SW组胰岛素样生长因子I(IGF-Ⅰ)水平显著高于GF组(P<0.05);SW组生长激素(GH)浓度显著高于GF组(P<0.05)。SF、GF组犊牦牛血清分泌型免疫球蛋白A(sIgA)浓度显著高于SW组(P<0.05)。相较于GF组,SF、SW组血清免疫球蛋白A(IgA)水平显著升高(P<0.05),SF组血清免疫球蛋白G(IgG)浓度显著高于GF组(P<0.05)。综上所述,营养均衡供给为妊娠后期和泌乳前期牦牛母体提供了充足的养分,通过增加犊牦牛养分摄入,提升了犊牛初生重、血清糖、氮营养代谢物水平,增加了生长相关激素及免疫球蛋白水平,从而促进了犊牦牛生长发育;早期断奶搭配营养均衡供给方式对犊牦牛生长发育、免疫功能无显著负面影响,并进一步促进生长激素分泌。

认知性访谈在过渡期炎症性肠病患者过渡准备量表文化调适中的应用

目的 应用认知性访谈探讨过渡期炎症性肠病患者过渡准备量表(Transition Readiness Measure,TRM)的认知与领悟,就中文版过渡准备量表中的语义等内容再次进行测试。方法 采用目的抽样法,选取上海市2所三级甲等医院就诊的18例处于过渡期的炎症性肠病患者,共开展3轮认知性访谈,了解其对中文版过渡准备量表初稿的认知,并结合专家小组意见,对存在歧义的条目进行修订,形成中文版过渡准备量表。结果 第1轮访谈结果表明,部分受访者对中文版过渡准备量表中的4个条目的表达和理解有歧义;第2轮访谈结果表明,2例受访者对其中1个条目的表达和理解有歧义;第3轮访谈结果表明,受访者均能正确地理解修订后的各个条目,保持与源量表语义的一致性。结论 认知性访谈基于患者视角进一步修订量表,促进受访者对中文版量表内容理解的一致性,有助于提高量表的科学性、适用性和准确性。

安宁疗护患者家庭照顾者出院过渡期照护困境的质性研究

目的深入探讨安宁疗护患者家庭照顾者出院过渡期的照护困境,为制定过渡期安宁疗护干预方案提供依据。方法以目的抽样法抽取安宁疗护患者家庭主要照顾者12人,采用现象学研究方法,以一对一形式进行半结构深入访谈,采用Colaizzi七步分析法分析访谈资料,提炼主题。结果提炼出3个主题9个亚主题,即角色应对困难(难以适应环境转变、难以独立照护患者、难以应对情感压力)、缺乏以家庭为中心的支持(出院照护准备不足、家庭社会支持不足、信息资源匮乏)、照护需求多样化(希望获得连续性护理服务、渴望获得居家照顾知识和技能、有意识的心理准备和哀伤辅导)。结论安宁疗护患者家庭照顾者出院过渡期照护困境复杂多样,存在多维度护理需求。医护人员应组建安宁疗护多学科团队,联合社会各方力量共同帮助照顾者克服患者出院过渡期照护困境,改善照顾者身心健康。

重型颅脑创伤患者ICU转出早期家属迁移应激体验的质性研究

目的探究重型颅脑创伤患者ICU转出早期其家属的迁移应激体验,为制订有效应对策略、促进家属心理适应提供参考。方法采用目的抽样法,选取转出ICU 72 h内的重型颅脑创伤患者的直接照护者作为访谈对象,对其进行面对面半结构式深度访谈。采用描述性现象学研究法及Colaizz七步分析法对访谈内容进行整理分析及主题提炼。结果针对访谈内容,提炼出重型颅脑损伤患者ICU转出早期其家属3个方面的心理体验:即患者转出ICU前后家属心理充满矛盾、对患者照护倍感压力以及希望了解更多疾病及照护相关内容。其中,对患者早日转出ICU的期待、对转出ICU时机的疑虑以及对普通病房照护条件的顾虑等构成家属的矛盾心理;其感到的照护压力来自照护工作本身、心理及经济方面等;同时,家属也希望通过有效的医患/护患沟通了解更多患者疾病及治疗信息、住院环境及流程的介绍指导、照护知识和技能等。结论医护人员应关注转出ICU早期患者家属的迁移应激体验,为其提供更多心理及信息支持,帮助家属顺利过渡,促进其照顾能力提升及患者康复。