Reshaping force for deformed casing repairing with hydraulic rolling reshaper and its influencing factors

Hydraulic rolling reshaper is an advanced reshaping tool to solve the problem of casing deformation,which has been widely used in recent years.When it is used for well repair operation,the reshaping force provided by ground devices is generally determined by experience.However,too large reshaping force may destroy the deformed casing,and too small reshaping force may also prolong the construction period and affect the repairing effect.In this paper,based on Hertz contact theory and elastic-plastic theory,combined with the process parameters of shaping,and considering the structural characteristics of the deformed casing and reshaper,we propose a mathematical model for calculating the reshaping force required for repairing deformed casing by hydraulic rolling reshaper.Meanwhile,the finite element model and numerical method of hydraulic rolling reshaper repairing deformed casing are established by using the finite element method,and the reliability of the mathematical model is verified by several examples.On this basis,the control variable method is used to investigate the influence of each parameter on the reshaping force,and the influence degree of each parameter is explored by orthogonal simulation test and Pearson correlation analysis.The research results not only provide an important theoretical basis for the prediction of reshaping force in on-site construction,but also provide a reference for the subsequent improvement of the shaping process.

The Concept of Digital Human Rights and Its Reshaping of Basic Rights

Whether a new generation of human rights emerges in the digital age has sparked widespread debate.Academic understanding of digital technology remains confined to thinking about network technology and products,often overlooking the revolutionary nature of digital media.Digital media has the sweeping potential to unify all forms of media and reshape social life,giving rise to new demands for a new generation of human rights.The concept of digital human rights can be defined as the legitimate rights of human's infinitely extended personalities through digital media.Its core characteristic is its transcendency,where every person lives in a networked space that surpasses physical boundaries,nations,and individual personalities.Human rights are generally considered the foundation for basic constitutional rights,which,in turn,form the basis for legislative acts across various sectors.In recent years,China has enacted numerous laws in the digital domain to keep pace with the times,but due to the lack of guidance on digital human rights,these laws tend to be fragmented and disjointed.It is urgent to unify digital legislation at all levels on the basis of reshaping basic constitutional rights.Thus,it is essential to reshape the basic rights based on the concept and characteristics of digital human rights and streamline legislation at all levels under the unified guidance of basic rights.This can help establish a comprehensive digital human rights protection system that meets the demands of the modern era.

Dynamics and response reshaping of nonlinear predator-prey system undergoing random abrupt disturbances

An actual ecological predator-prey system often undergoes random environmental mutations owing to the impact of natural disasters and man-made destruction, which may destroy the balance between the species. In this paper,the stochastic dynamics of the nonlinear predator-prey system considering random environmental mutations is investigated, and a feedback control strategy is proposed to reshape the response of the predator-prey system against random abrupt environmental mutations. A delayed Markov jump system(MJS) is established to model such a predator-prey system. A novel first integral is constructed which leads to better approximation solutions of the ecosystem. Then, by applying the stochastic averaging method based on this novel first integral, the stochastic response of the predator-prey system is investigated, and an analytical feedback control is designed to reshape the response of the ecosystem from the disturbed state back to the undisturbed one.Numerical simulations finally illustrate the accuracy and effectiveness of the proposed procedure.

Evidence for the role of KIF17 in fish spermatid reshaping:expression pattern of KIF17 in Larimichthys polyactis spermiogenesis

The homodimeric kinesin-2 protein KIF17 functions in intracellular transport and spermiogenesis in mammals.However,its role in fish spermiogenesis has not been reported.Here,we aimed to clone full-length kif17 cDNA and determine the molecular characteristics and expression patterns of KIF17 in Larimichthys polyactis spermiogenesis.The full-length cDNA of L.polyactis kif17(Lp-kif17)was sequenced and found to contain a 332-bp 5′untranslated region,480-bp 3′untranslated region,and 2433-bp open reading frame encoding 810 amino acids.Bioinformatics analyses showed that L.polyactis KIF17(Lp-KIF17)shared high sequence similarity with homologs in other animals and possessed an N-terminal motor domain with microtubule-binding sites and adenosine triphosphate(ATP)hydrolysis sites,a stalk domain containing two coiled-coil regions,and a C-terminal tail domain.The Lp-kif17 mRNA was widely expressed in various tissues,with the highest level in the brain,followed by that in the testis.Fluorescence in situ hybridization(FISH)analysis revealed that Lp-kif17 was continuously expressed in spermiogenesis,showing that it had potential functions in this process.Using immunofluorescence(IF)analysis,we found that Lp-KIF17 colocalized with tubulin and was transferred from the perinuclear cytoplasm to the side of spermatid where the tail forms during spermiogenesis.These findings suggested that KIF17 is involved in L.polyactis spermiogenesis.In particular,it may participate in nuclear shaping and tail formation by interacting with perinuclear microtubules during spermatid reshaping.In addition to providing evidence for the role of KIF17 in fish spermatid reshaping,this study provides important data for studies of reproductive biology in L.polyactis.

Crossing the Growth Threshold： Service-Based Economy, Knowledge Process and Reshaping of Efficiency Model

The transition from middle-income to high-income stage is fraught with risks of growth divergence. Economic transition is clouded by the following possibilities： （1）falling share of industrial seetor through industrial depression and weakening growth momentum caused by the large urbanization costs; （2） the subordination of service sector as a result of nearly irreversibly industrial professional, which falters the process of service sector transition and upgrading,＂ （3） inefficient knowledge production allocation and human capital upgrade due to the absence of incentivized compensation of knowledge consumption. We suggest that a country should reshape its efficiency model by upgrading knowledge factor and human capital as the pre-requisite. Given the dilemmas of transition, China should take the faetorization trend of service sector and reshape efficiency model through institutional reform, ensuring that service sector will develop in tandem with industrial sector.

Construction of Reshaping Single-domain Antibody against CD3

The combining site of OKT3 was modeled,and Human Ig LS1 and ND were selected asacceptors of CDRs of OKT3 VL and VH to construct a reshaping antibody against CD3.Bycomparing OKT3,LS1 and ND,with their own family sequences,some residues werechanged and the reshaping VL and VH genes were designed.The full VH gene was assem-bled in three steps with eight chemically synthesized oligonucleotide fragments using over-lapping PCR and sequenced.The VH gene was expressed as active protein and inclusion bod-ies in the vectors of pCOMB3 and pGEX-4T-1 by ELISA and Western blot analysis.

Pattern of Opening Up,Integration and Reshaping Economic Geography——A New Economic Geography Analysis of the Belt and Road Initiative and the Yangtze River Economic Belt

Since the 18 th National Congress of the Communist Party of China,the central government has implemented several regional development plans,including the Belt and Road Initiative and the Yangtze River Economic Belt,aiming to reshape the economic geography of China.This paper is based on the Belt and Road Initiative and the Yangtze River Economic Belt and outlines the pattern of opening up.To analyze the impact of the pattern of opening up on the regional integration of China's economic geography,this paper has developed a new economic geography model comprised of four regions and two countries.From this,it draws some conclusions.First,the change of pattern of opening up will lead to shifting centripetal and centrifugal forces from the international market.The greater the scale of neighboring markets,the stronger the agglomeration force will be; the more product varieties made in neighboring countries,the more potent its dispersion force.Second,developing an inland international trade corridor will decentralize industry distribution and reduce the impact of external market integration on home countries.Third,the inland international trade corridor could alter the effect of domestic market integration on the economic geography.When domestic integration occurs prior to international integration,further integration of a domestic market leads to greater industrial distribution along a bell-shaped curve,which describes economic activities from dispersion to agglomeration to decentralization.Therefore,developing an integrated market system of major countries and opening a corridor between China and Europe is not only the key to reshaping China's economic geography but also the path to solving the problems of the Heihe-Tengchong Line.

2018: INTERNATIONAL SECURITY ORDER IN VIBRATION AND RESHAPING

The global security situation in 2018 continued with its recent years of complexity and volatility,with its order and rules challenged by the prevailing unilateralism and trade protectionism,the emerging nationalism and populism,the resurgent power politics and authoritarianism,theintensified competition in geopolitical and other new areas,and the incessant regional turmoil and conflicts.

论露天矿区近自然生态修复

露天矿区生态修复面临着重建生态系统自维持力低、维持成本高,尤其是修复后“采矿痕迹”明显等问题,亟待协调好人工修复与自然恢复的关系,升级发展传统生态修复模式,促进露天矿区人与自然和谐共生。在长期的理论方法研究和应用实践经验总结基础上,①提出了露天矿区近自然生态修复的必要性及其理论内涵与技术框架。近自然矿山生态修复是参照本地自然地貌、水文、土壤、植被、景观及其演变规律,使修复后的矿业斑块达到与周边自然生态系统近似的结构与功能状态,并与周边自然地貌、水系、景观相融合的修复模式,是对传统生态修复模式的升级,逼近“采矿无痕”是其追求的理想状态。②近自然生态修复是露天矿生态化设计的重要构成,其技术环节主要包括,参照生态系统学习、近自然地貌重塑、水文衔接与调控、矿山活土层重构、植被重建与多样性重组等。参照生态系统学习为后续各个修复环节提供修复目标与参数。近自然地貌重塑是近自然生态修复的核心与基础,包括内排土场全生命周期近自然地貌重塑、外排土场近自然地貌重塑、邻近自然问题地貌协同重塑等。水文衔接与调控要解决河道沟道的优化布局、矿区上下游水系的衔接、以蓄代排径流调控等。矿山活土层重构包括矿山土物理结构重组、微生物和养分循环过程重构等内容;植被重建与多样性重组包括近自然的植物群落与多样性配置,以及近自然的植株空间布局等。③实践分析表明,露天矿近自然生态修复有助于减少土壤侵蚀,提高地貌稳定性,增强重建生态系统的自维持能力,有利于实现露天矿区“采矿无痕”,促进人与自然和谐共生。

跟网型变换器的小扰动同步稳定机理分析与致稳控制

弱电网下,跟网型变换器易出现因阻尼不足导致的小扰动同步失稳问题。为此,该文借鉴复转矩分析理论,计及复杂控制耦合,建立跟网型变换器的复转矩模型。量化多环控制耦合、线路阻抗、控制参数等因素对系统阻尼转矩的影响,从阻尼的角度揭示跟网型变换器的小扰动同步失稳机理。根据理论分析,提出一种基于相位补偿的锁相环阻尼重塑控制策略,通过补偿多环控制耦合引入的负阻尼,增强变换器的小扰动同步稳定性。最后,开展相应的仿真与实验,验证理论分析的正确性与改进控制策略的有效性。

新质生产力驱动卫生系统重塑的当前表现与潜在挑战

新质生产力概念的提出是对传统生产力理论的拓展和深化,是对经济社会发展的深刻洞察和前瞻引领,为理解和应对新时代机遇和挑战提供了重要的理论指导和实践框架。新质生产力关注产业的高级化和现代化进程,是摆脱传统增长路径、符合高质量发展要求的新型生产力,强调了科技创新、知识经济、信息化和数字化等新型生产要素和组合形态在生产力进化中的关键作用。新质生产力释放了驱动卫生系统高质量发展的新动力,在指导卫生系统变革与重塑过程上具有时代意义。通过论述新质生产力驱动卫生系统重塑过程中的表现和挑战,旨在将新质生产力概念引入卫生政策与管理领域,以期引发学界探讨其在卫生领域的重塑潜力和阻碍,为政策制定者和卫生管理者提供理论依据和决策参考。

智能时代教育场域的技术焦虑与认知误区——基于梅洛-庞蒂具身认知观的当下省察

人工智能的迅猛发展极大地改变了教育生态和教学秩序,由此也引发了教育场域下史无前例的“技术焦虑”。通过追根溯源对“技术焦虑”的成因加以解析,发现其中的大部分焦虑情绪都是由教育主体的认知误区导致的,而法国现象学家梅洛-庞蒂的“具身认知观”为梳理这一认知误区提供了极好的理论依据。“具身认知观”在人类的自我认知上呈现了一种全新的思维模式,并对传统认知观的外在逻辑主义立场采取质疑态度,进而将人类教育的本质是什么以及人工智能和人类智能的本质区别一一呈现出来,从根本上对智能时代教育场域下的“技术焦虑”做出认知矫正,并依此寻求纾解路径。

智能时代大学生劳动教育价值重塑与实践路径

“劳动”是人类文明发展的最重要与最基本的方式,是提升国民经济的强大动能。纵观当前,以智能技术为主体的新型劳动形式,不仅给传统劳动带来挑战,也冲击了人们传统的劳动理念。大学生劳动教育应顺应时代发展潮流,充分借助和发挥智能设备、智能技术、智能手段,使劳动教育拥有全新的育人形态,促进学生德智体美劳全面发展。结合智能时代对人类劳动的影响,明确劳动教育价值重塑的内容,分析劳动教育的问题,提出科学合理的劳动教育实践路径。

新质生产力空间形态刍论

新质生产力的空间形态是影响“因地制宜发展新质生产力”的重要理论问题。围绕这一问题,从新质生产力与中国式现代化的关系出发,对新质生产力的空间形态进行了探索,“新质生产力首先必然是国家生产力”的观点得以提出并对其论述,并指出区域层面的新质生产力发展必须服从于这一观点,才能在新质生产力时代赢得新的发展机遇;在此基础上,提出了兼顾新质生产力引领发展、统筹发展和重塑格局的综合功能,兼顾新质生产力的国家属性、人类属性和未来属性等对策建议。

新质生产力驱动全社会物流成本降低的机制与路径

新质生产力作为新时代的新动能,能够有效降低全社会物流成本。剖析新质生产力内涵和特征,探究新质生产力驱动全社会物流成本降低的机制与路径,具有重要意义。新质生产力强调技术创新、绿色可持续和智能化,符合高质量发展和数字经济时代生产力发展的要求,可解构为企业层面的数字化重构力、产业层面的协同进化力、社会层面的创新策源力。在新质生产力驱动全社会物流成本降低的过程中,数字化重构力是核心、协同进化力是基础、创新策源力是动能。其中,数字化重构力通过智能升级企业层面的物流活动,重塑企业生产运营模式,赋予企业新型生产要素、生产力和生产关系,引领企业物流从业务价值创造向多维度价值创造转变,有效降低企业层面的物流成本。协同进化力通过优化产业层面的物流链路,形成产业间技术渗透融合新特征、产业内分工协作新格局、平台化产业新生态,加快产业数智化进程、推动产业融合发展、助力产业绿色转型,有效降低产业层面的物流成本。创新策源力通过社会层面的物流结构优化、物流体系升级,打造高质量物流生态系统、创新物流商业模式、优化物流资源配置,推动社会物流全面降本。为有效降低全社会物流成本,应大力发展数字化重构力,鼓励企业加快数字物流建设。大力发展协同进化力,以物流业为核心推动现代产业协同发展。大力发展创新策源力,加快培育社会物流新优势。

服务重塑:数字化如何弥合服务鸿沟?--基于“互联网+”医疗健康的探索性案例研究

随着服务需求端新消费行为的催生以及需求个性化的不断觉醒,服务供给端的创新模式亟待被重构,以互联网为代表的深度数字化成为跨越“服务鸿沟”的新引擎.本研究聚焦于与“互联网+”趋势深度融合的医疗健康行业,选取厦门“医疗健康+互联网”和微医“互联网+医疗健康”的服务模式,系统探索了数字赋能下弥合服务鸿沟的服务重塑机制.研究发现:第一,服务鸿沟可解构为信息不对称、资源错配和数据孤岛三个层面;第二,基于数字赋能的服务重塑是弥合服务鸿沟的关键路径,并主要表现为服务设计重塑、服务传递重塑和服务交互重塑对服务鸿沟的弥合过程;第三,“医疗健康+互联网”和“互联网+医疗健康”的服务重塑机制分别遵循服务数字化逻辑和数字服务化逻辑,前者聚焦基于数字技术的服务主导逻辑及服务性质的转变,而后者关注基于数字技术的应用及创新性扩散.本研究最终所形成的理论框架,能够贡献于现有文献对于服务鸿沟弥合路径探寻不足所造成的理论缺口,基于数字赋能下服务重塑机制提炼出的服务数字化与数字服务化逻辑,进一步深化了对数字技术与服务化领域深度融合背后所蕴含理论规律的挖掘与探索.

顶层设计与角色重塑:高校学术期刊高质量发展的路径迭代

作为学术共同体的重要组成部分,高质量的学术期刊是助推高校“双一流”建设的重要引擎。然而,“双一流”建设背景下,高校学术期刊高质量发展面临困局。其中,国家“双一流”建设的顶层制度设计对高校学术期刊的高质量发展观照不足,高校学术期刊的角色定位在曲折中发展,在资助政策下成长;主办高校对学术期刊支持不够,存在高校科研评估与期刊建设理性、主办高校对外“窗口”与学术公共“平台”、特色发展与集约规范管理等对立冲突,高校学术期刊的基层实践成效不佳。因此,应以“双一流”建设为契机,促进高校学术期刊的高质量发展与“双一流”建设良性互动,积极构建有利于高校学术期刊高质量发展的生态圈层,重塑高校学术期刊的角色定位。在顶层设计上,指引学术期刊深度参与“双一流”建设的发展定位;在中层支持上,强化主办高校统筹“学术期刊和学科发展”互融互促学术共同体建设的主体责任;在基层创新上,提升高校学术期刊在助力“双一流”建设实践中的学科贡献力和学术引领力。

间伐改形影响密闭苹果园树体花芽激素含量及相关基因

[目的]富士苹果栽培中普遍存在成花困难、大小年结果严重等问题,尤其在密闭果园中更为突出。本文旨在研究间伐改形对甘肃陇东高原密闭苹果园树体花芽激素含量及相关基因的影响,为进一步研究间伐改形对苹果花芽分化提供试验基础。[方法]在甘肃静宁县城川镇,以十五年生树龄阶段的密闭‘长富2号’苹果园为研究对象,2022年春季对密闭果园的一半进行间伐改形处理,另一半果园作为对照,不进行间伐改形,同年,分别在花芽生理分化前期和花芽生理分化后期,对间伐改形和不间伐改形树体花芽进行转录组分析和生长相关激素含量测定。[结果]无论在花芽分化生理前期和后期,间伐改形后树体花芽赤霉素、吲哚乙酸和脱落酸含量均明显增加,同时发现,转录组中有580个基因表达发生变化,并从中挑选出5个生长发育相关基因(MD10G1048600(NAC030)、MD01G1090300(CCA1)、MD02G1124900(PIP2-7)、MD01G1016100(ABR1)、MD07G1280300(WRKY27)),对这5个基因进行qRT-PCR,发现在对苹果园进行间伐改形处理后,这5个基因都有明显的上下调变化,且与转录组变化结果一致。[结论]间伐改形对苹果花芽分化有显著作用,可以促进花芽赤霉素、吲哚乙酸和脱落酸的形成,也能促进生长发育相关基因的表达。

钛合金型材热张力矫形过程温度均匀性控制研究

钛合金型材截面形状复杂,热挤压后由于截面各处散热不均,易产生扭拧、弯曲等形状缺陷,矫形难度大。热张力矫形是实现钛合金型材矫形的最有效方式,而矫形过程中型材温度的均匀性控制是实现高精度矫形的关键。以TA15钛合金薄壁锐角L型材为研究对象,研究了加热及冷却过程中型材截面各处温度的分布规律。结果表明,钛合金型材热张力矫形时,加热过程中随着加热温度的升高,型材头部、中部、尾部的温差逐渐增大,中部温度高于两端,加热至设定温度700℃时温差达50℃。冷却过程中,型材同一截面其边部温降较角部快,最高温差达100℃,随着冷却温度的降低,这种温差逐渐减小。在钛合金型材热张力矫形时,加热到设定温度后持续通电约2 min,冷却过程中用石棉布包裹型材可有效提高温度的均匀性,实现高精度矫形。