对“core strength”是“核心力量”或“中心力量”的辩析

近年来,国内竞技体育中对核心力量、核心稳定性的研究甚为流行,而这种概念是源自国外"core、core strength、core stabil-ity"的理解与翻译。通过对大量国内外文献资料的研究发现:我国目前对核心、核心力量、核心稳定性的提法并不准确,对"core、core strength、core stability"重新提出了新的理解与观点,提出了中心、中心力量、中心稳定性的概念,并且对中心肌肉群、中心力量进行了划分和归类,进一步完善了运动训练中对"core、core strength、core stability"的定义,为进一步准确指导运动员力量训练提供可行的理论依据和帮助。

Photochemical synthesis of bimetallic Au-Ag nanoparticles with “core-shell” type structure by seed mediated catalytic growth

The colloidal Au core/Ag shell structure composite nanoparticles were synthesized in PEG-acetone solution by photochemical route. The monodispersed Au nanoparticles with average diameter of 3.9 nm were used as growth seeds. The optical property of colloids and the sizes of composite nanoparticles were characterized when the molar ratio of Au to Ag ranges from 4∶1 to 1∶4. The results show that a composite nanoparticle structure similar to strawberry shape is formed at the molar ratio of Au to Ag from 4∶1 to 1∶1; the composite nanoparticles consisting of a core of Au and shell of Ag were generated at the 1∶4 molar ratio, having a striking feature of forming (interconnected) network structure.

SIHC:一种高效的时态图上k-core查询算法

许多实体之间的关系可以建模为时态图,其中每条边都与表示其发生的时间相关联,k-core是捕获密集子图的基本模型,在近些年得到了广泛研究.给定时间区间I=[s,e]和k值,时态图G上的k-core子图查询从区间I对应的快照图GI中返回相应的k-core子图.针对时态图中的k-core子图查询问题,现有方法是基于PHC索引(Pruned Historical Core-Index)的算法.对任意可能的k值,PHC索引维护了所有可能出现在某个时间区间的k-core子图中的顶点集Sk,且为集合中每个顶点存储了一组时间区间,用于判定该点是否属于给定时间区间的k-core子图.基于PHC索引查询k-core子图时,需要访问Sk集合中的所有顶点,并判断每个顶点的可满足性.由于Sk集合对应于最大区间快照图的k-core子图里的所有顶点,且实际中用户查询区间对应的快照图往往比最大区间快照图小得多,基于PHC索引的查询算法存在许多无效判断,需要对大量不在结果集中的顶点进行检测,且无效检测次数随着查询区间的缩短而增多,从而导致算法效率较低.针对该问题,本文提出一种新的索引,即最短区间历史核索引SIHC(Shortest Interval Historical Core Index).SIHC索引的基本思想是通过维护最短k核区间到顶点的倒排表,查询处理时,可基于用户给定的时间区间定位到SIHC索引中满足条件的区间,进而直接得到满足条件的k-core子图中的顶点,从而避免了基于PHC索引进行查询时所需的大量无效判断.我们从理论上证明了基于SIHC索引处理时态图上k-core子图查询的正确性,并设计了高效的索引构建算法.最后,基于真实世界的时态图进行了实验,实验结果表明本文提出的算法比现有算法快1~2个数量级.

矩阵对偶Core-EP逆性质的进一步研究

利用矩阵的Drazin逆以及Moore-Penrose逆描述了对偶Core-EP逆,并应用矩阵的Core-EP分解给出了对偶Core-EP逆的分块矩阵表达。受到EP矩阵的启发,得到了矩阵是k次对偶Core-EP矩阵的充要条件,并得到了一些矩阵为k次对偶Core-EP矩阵的结论。

基于DWC PCIE Core的数据传输系统设计

在铁路信号系统中,为有效减少铁路信号系统设备CPU资源占用率,设计一种基于DWC PCIE Core的数据发送与接收系统。该系统采用内嵌ARM Cortex-A9双核的FPGA开发板套件,利用FPGA的灵活性和可扩展性,采用可配置的PCIE硬核IP模块以及以太网硬核IP模块。该系统主要介绍Host PC与FPGA之间基于PCIE 2.0的DMA数据传输以及FPGA之间基于GMAC的以太网数据传输,通过PCIe总线、以太网基于DMA模块实现数据高速可靠传输。

基于.NETCore的会议考勤移动打卡系统设计与实现

随着移动互联网和移动设备的普及,管理人员开始通过手机等移动设备关注会议考勤信息,这不仅有助于及时掌握参会人员的出席情况,还能在必要时采取措施以支持会议的正常进行。其中,移动化的会议考勤打卡系统具有灵活性、便捷性等特点,参会人员可以随时随地进行打卡和签到,管理人员则可以实时查看和管理会议考勤数据,大幅提高了工作效率和管理水平。基于此,文章提出了一个基于.NET Core的会议考勤打卡系统。该系统结合了各类会议考勤和会议管理需求,不仅简化了会议考勤管理流程,还提高了工作效率,为管理人员提供了数据分析和决策支持。

基于共享内存的AcoreOS653操作系统层与分区应用层的通信技术研究

为了满足AcoreOS653嵌入式实时操作系统中将操作系统层可获取到的目标数据提供给分区应用使用的需求,文章阐述了一种基于共享内存的操作系统层和分区应用层的通信方法,重点描述了共享数据区的通信配置和数据交换的操作方法,对开发人员的实际使用具有一定的借鉴意义。

基于距离泛化的二分图(α,β)-core高效分解算法

(α,β)-core分解作为图数据管理与分析研究中的热点问题,已经被广泛应用于电商欺诈检测和兴趣群组推荐等实际场景中。然而现有(α,β)-core模型在构建时仅考虑顶点距离为1的邻居,难以刻画出二部图社区中的细粒度信息。针对此问题,提出了基于距离泛化的(α,β,h)-core模型,即由二部图中两个不相交的顶点集构成一个最大子图,满足一个集合中的任何一个顶点至少有α个与它的距离不大于h的邻居顶点,另一个集合中的任何一个顶点至少有β个与它的距离不大于h的邻居顶点。通过引入距离为h的邻居,解决了(α,β)-core模型细粒度刻画能力不足的问题。由于新模型需要考虑距离不大于h的邻居,因此(α,β,h)-core分解变得更为困难。为此,提出了基于计算共享的分解策略,据此设计了高效的(α,β,h)-core分解算法,并分析了算法性能。考虑到确定距离不大于h的邻居顶点非常耗时,还提出一种(α,β,h)-core下界以减少重复计算距离不大于h的邻居顶点,进一步提高计算效率。在8个真实图数据上的对比实验结果验证了新模型的有效性和算法的高效性。

基于C#.NET Core技术与三菱PLC的通信方式研究

为了实现智能制造产业中的实时监控、数据共享及各设备间的协同工作,在.NET Core 7.0环境下研究三菱小型PLC与计算机之间的串口通信和MC协议通信方式,开发了三菱PLC通信管理系统,成功实现了上位机对现场PLC的数据采集和远程操作,使用云端数据库技术和数据库管理工具对数据进行分析处理,从而实现对设备工作状态的实时监控及故障分析。

Interrelationships between Length of the Day, Moon Distance, Phanerozoic Geodynamic Cycles, Tidal Dissipation and Earth’s Core: Review and Analysis

The rotation of the Earth and the related length of the day (LOD) are predominantly affected by tidal dissipation through the Moon and the growth of the Earth’s core. Due to the increased concentration of mass around the rotation axis of the spinning Earth during the growth of the core the rotation should have been accelerated. Controversially the tidal dissipation by the Moon, which is mainly dependent on the availability of open shallow seas and the kind of Moon escape from a nearby position, acts towards a deceleration of the rotating Earth. Measurements of LOD for Phanerozoic and Precambrian times open ways to solve questions concerning the geodynamical history of the Earth. These measurements encompass investigations of growth patterns in fossils and depositional patterns in sediments (Cyclostratigraphy, Tidalites, Stromatolites, Rhythmites). These patterns contain information on the LOD and on the changing distance between Earth and Moon and can be used as well for a discussion about the growth of the Earth’s core. By updating an older paper with its simple approach as well as incorporating newly published results provided by the geoscientific community, a moderate to fast growth of the core in a hot early Earth will be favored controversially to the assumption of a delayed development of the core in an originally cold Earth. Core development with acceleration of Earth’s rotation and the contemporaneous slowing down due to tidal dissipation during the filling of the ocean may significantly interrelate.

Assessment of Axial Power Peaking Factors in GHARR-1 LEU Core: A Decadal Simulation Analysis

This study aims to thoroughly investigate the axial power peaking factors (PPF) within the low-enriched uranium (LEU) core of the Ghana Research Reactor-1 (GHARR-1). This study uses advanced simulation tools, like the MCNPX code for analysing neutron behavior and the PARET/ANL code for understanding power variations, to get a clearer picture of the reactor’s performance. The analysis covers the initial six years of GHARR-1’s operation and includes projections for its whole 60-year lifespan. We closely observed the patterns of both the highest and average PPFs at 21 axial nodes, with measurements taken every ten years. The findings of this study reveal important patterns in power distribution within the core, which are essential for improving the safety regulations and fuel management techniques of the reactor. We provide a meticulous approach, extensive data, and an analysis of the findings, highlighting the significance of continuous monitoring and analysis for proactive management of nuclear reactors. The findings of this study not only enhance our comprehension of nuclear reactor safety but also carry significant ramifications for sustainable energy progress in Ghana and the wider global context. Nuclear engineering is essential in tackling global concerns, such as the demand for clean and dependable energy sources. Research on optimising nuclear reactors, particularly in terms of safety and efficiency, is crucial for the ongoing advancement and acceptance of nuclear energy.

Phase II Clinical Study of Three-Dimensional Printed Coplanar Template Combined with CT-Guided Percutaneous Core Needle Biopsy of Pulmonary Nodules in Elderly Patients

Background: As the population age structure gradually ages, more and more elderly people were found to have pulmonary nodules during physical examinations. Most elderly people had underlying diseases such as heart, lung, brain and blood vessels and cannot tolerate surgery. Computed tomography (CT)-guided percutaneous core needle biopsy (CNB) was the first choice for pathological diagnosis and subsequent targeted drugs, immune drugs or ablation treatment. CT-guided percutaneous CNB requires clinicians with rich CNB experience to ensure high CNB accuracy, but it was easy to cause complications such as pneumothorax and hemorrhage. Three-dimensional (3D) printing coplanar template (PCT) combined with CT-guided percutaneous pulmonary CNB biopsy has been used in clinical practice, but there was no prospective, randomized controlled study. Methods: Elderly patients with lung nodules admitted to the Department of Oncology of our hospital from January 2019 to January 2023 were selected. A total of 225 elderly patients were screened, and 30 patients were included after screening. They were randomly divided into experimental group (Group A: 30 cases) and control group (Group B: 30 cases). Group A was given 3D-PCT combined with CT-guided percutaneous pulmonary CNB biopsy, Group B underwent CT-guided percutaneous pulmonary CNB. The primary outcome measure of this study was the accuracy of diagnostic CNB, and the secondary outcome measures were CNB time, number of CNB needles, number of pathological tissues and complications. Results: The diagnostic accuracy of group A and group B was 96.67% and 76.67%, respectively (P = 0.026). There were statistical differences between group A and group B in average CNB time (P = 0.001), number of CNB (1 vs more than 1, P = 0.029), and pathological tissue obtained by CNB (3 vs 1, P = 0.040). There was no statistical difference in the incidence of pneumothorax and hemorrhage between the two groups (P > 0.05). Conclusions: 3D-PCT combined with CT-guided percutaneous CNB can improve the puncture accuracy of elderly patients, shorten the puncture time, reduce the number of punctures, and increase the amount of puncture pathological tissue, without increasing pneumothorax and hemorrhage complications. We look forward to verifying this in a phase III randomized controlled clinical study. .

A Physical Core-Loss Model for Laminated Magnetic Sheet Steels

A full-frequency instant core-loss equation built from the induction physical model of magnetic materials, where the iron loss, eddy loss, and hysteresis loss no longer have an integral term, and this new equation provides high simulation accuracy and performs dynamic core loss analysis on non-sinusoidal or pulse magnetic fields. The simulation examples use a high-grade electrical steel sheet 65CS400 by Epstein experimental data covering magnetic field 0.1 - 1.8 T and frequency 50 - 5000 Hz, and the average error of the simulated core loss is less than 4%. Since the simulation is converged by magnetic physical parameters, so the physical relevance of the similar laminated materials can be compared with the coefficient results. .

基于.NET Core的企业微信二次认证的设计与实现

文章旨在探讨如何设计一个满足学校需求的系统,以便学校能够顺利、安全、高效地将新生加入企业微信,实现信息化管理和学生服务的目标。首先,系统需要包括一个完善的身份认证流程,以确保加入企业微信的新生都是学校的正式学生,从而保障企业微信的安全性和有效性。其次,该系统需要提供清晰明了的认证流程和良好的反馈机制,让新生能够快速完成认证,并了解自己的认证状态和下一步的操作,避免给新生带来额外的烦扰。

基于CORE模型的古街文旅体验产品设计

目的 古街需要形成浓郁的人文氛围和商业环境,通过开发具有优良体验感的文旅产品,为现有文旅产品增加更多互动体验的环节。这不仅可以让游客充分感受古街的地域特色,增强出行动机,也可以使游客有节奏地体验到古街文旅产品中传达的信息,从而对产品体验形成获得感、满足感、认同感等感受,以促进古街文旅产业发展。方法 基于CORE模型,采用观察法、文献研究法、探索性研究法收集当下古街文旅产品体验的趣味点,结合头脑思维风暴,借鉴游戏、玩具、劳动实践中体验感好的部分,组织设计行动及体验活动,重视产品体验心理过程的反馈。结果 设计创新性体验产品及体验流程,通过李克特量表及Kano模型对产品方案进行评估。结论 在设计新产品时,重点展现文旅产品的趣味体验,对在售产品提供体验活动思路及行动方案,从而提升游客对地域特色文化的感受力。

基于iOS平台Core ML端智能应用研究

端智能因其模型在设备端训练与运行,相对云端智能具有更好的隐私性与实时性,同时它可以根据用户的操作行为与使用习惯进行个性化、动态的调整.基于Core ML机器学习框架,通过3个不同的iOS案例分析了Core ML的主要功能,通过图片分类App的开发过程阐述了基于Core ML端智能应用的实现,为端智能在工程实践中的应用提供参考依据.

从学习进阶到内容重构:基于情境链的体育与健康课程大单元的内部构建

情境链是体育与健康课程大单元教学内容重构的重要支撑,能有效解决中小学体育教学实践中的教学内容低级重复、情境创设连贯性较弱和延展性不够等问题。基于情境链的体育与健康课程大单元教学重视链式整合的课程样态,依托递进的情境进行专项运动技能的有效学练,通过情境链串联目标、任务、内容等课程元素,整体规划体育与健康课程大单元的学习路径。情境认知理论、境脉学习理论与学习进阶理论为情境链的深入理解提供了理论基石与实操框架。结合三大理论的基本要素探讨基于情境链的体育与健康课程大单元的构建流程,聚焦核心素养的整体性,通过水平二“篮球保护和控制球能力的提升”大单元主题案例,从“精准分析学情,确立大单元学习目标”“提取关键概念,规划大单元学习路径”“串联进阶元素,重构大单元学习内容”“基于真实情境,评价学生的学习表现”展现完整的情境链研究。

民营经济高质量发展与新质生产力:关联机理与互动路径

习近平总书记在创新发展马克思主义生产力理论的基础上提出“新质生产力”这一以科技创新为主导、以关键性颠覆性技术突破为依托的全新生产力概念。新质生产力是对传统生产力的升级与飞跃,旨在推动我国实现高质量发展。改革开放以来,民营经济在我国解放、发展生产力的过程中发挥了重要作用。步入新发展阶段,民营企业将因具备创新发展意识、产业创新优势、企业家精神才能等特殊优势而成为我国培育新质生产力的有生力量。与此同时,民营经济也将在形成新质生产力的过程中实现发展质量变革。为此,要支持民营企业参与关键核心技术攻关,动员民营企业助推新型工业化与产业现代化,引导民营经济布局新兴产业和未来产业,完善支持民营企业培育新质生产力的体制机制,以实现民营经济高质量发展与新质生产力培育的良性互促。

采前氨基乙氧基乙烯甘氨酸处理对‘黄冠’梨长期冷藏后果实品质和果心褐变的影响

为延长‘黄冠’梨贮藏期,减轻长期贮藏后货架期间果实品质劣变,采用不同浓度氨基乙氧基乙烯甘氨酸(aminoethoxyvinylglycine,AVG)在采前喷施‘黄冠’梨果实,在冷藏180 d及货架7 d((180+7)d)后检测相关指标。结果显示,采前喷施AVG可延缓‘黄冠’梨果实硬度下降,维持可溶性固形物含量以及可滴定酸含量,有效抑制果面褐斑和果心褐变的发生,其中以200 mg/L AVG效果最好。‘黄冠’梨果实在长期冷藏时果心发生褐变,同时熊果苷、绿原酸以及总酚含量增加,多酚氧化酶活性升高;PbPAL1、PbPAL2、PbPPO1、PbPPO5、PbLOX1以及PbLOX5在冷藏期间表达量升高,货架期表达量随之下降。采前200 mg/L AVG处理‘黄冠’梨,可显著促进熊果苷、绿原酸以及总酚在整个贮藏过程中含量的增加,抑制多酚氧化酶活性升高,抑制PbPAL1、PbPAL2、PbPPO1、PbPPO5以及PbLOX5的表达,进而有效减少果心褐变的发生。

基于Angular和ASP.NET Core技术的数据采集系统的设计与实现

针对国家电网有限公司(以下简称国网公司)提出的实时采集工厂生产数据需求,论述一个基于Angular和ASP.NET Core的数据采集系统的设计与实现。深入探讨开发过程中所使用的软件构架以及通信方法,设计分析数据采集系统的各项功能和数据种类,建立合适的高效软件框架体系,最后给出关键设计和系统实现。该系统的成功运行能够表明,结合Angular和ASP.NET Core技术,并利用Visual Studio模板能够创建复杂并且高效的系统,且设计系统具有良好的稳定性及易维护性。