Influence of the mechanical properties of materials on the ultimate pressure-bearing capability of a pressure-preserving controller

The pressure-preserving controller is the core part of deep in-situ pressure-preserving coring(IPP-Coring) system, and its pressure-preserving capability is the key to IPP-Coring technology. To achieve a good understanding of the influence of mechanical properties of materials on the ultimate pressure-bearing capability(UPB-Capability) of the pressure-preserving controller, the IPP-Coring experimental platform was developed to test the UPB-Capability of pressure-preserving controllers of four different materials. The experimental results show that the UPB-Capability of pressure-preserving controllers with different material varies greatly. A numerical model of the pressure-preserving controller was developed to study the influences of mechanical parameters of materials on the UPB-Capability of the pressurepreserving controller after the accuracy of the numerical model is verified by experiments. The results indicate that the yield strength(YS) and Poisson's ratio(PR) of the material have little effect on the UPB-Capability of the pressure-preserving controller, whereas the elastic modulus(EM) of the material has a significant effect. A generalized model of the UPB-Capability of the pressure-preserving controller is developed to reveal the mechanism of the influence of material properties on the UPB-Capability of the pressure-preserving controllers. Considering these results, the future optimization direction of the pressure-preserving controller and material selection scheme in practical engineering applications of the pressure-preserving controller are suggested.

Optical trapping capability of tornado circular Pearcey beams

We systemically investigate optical trapping capability of a kind of tornado waves on Rayleigh particles.Such tornado waves are named as tornado circular Pearcey beams(TCPBs)and produced by combining two circular Pearcey beams with different radii.Our theoretical exploration delves into various aspects,including the propagation dynamics,energy flux,orbital angular momentum,trapping force,and torque characteristics of TCPBs.The results reveal that the orbital angular momentum,trapping force,and torque of these beams can be finely tuned through the judicious manipulation of their topological charges(l_(1)and l_(2)).Notably,we observe a precise control mechanism wherein the force diminishes with|l_(1)+l_(2)|and|l_(1)-l_(2)|,while the torque exhibits enhancement by decreasing solely with|l_(1)+l_(2)|or increasing with|l_(1)-l_(2)|.These results not only provide quantitative insights into the optical trapping performance of TCPBs but also serve as a valuable reference for the ongoing development of innovative photonic tools.

Accountable capability improvement based on interpretable capability evaluation using belief rule base

A new approach is proposed in this study for accountable capability improvement based on interpretable capability evaluation using the belief rule base(BRB).Firstly,a capability evaluation model is constructed and optimized.Then,the key sub-capabilities are identified by quantitatively calculating the contributions made by each sub-capability to the overall capability.Finally,the overall capability is improved by optimizing the identified key sub-capabilities.The theoretical contributions of the proposed approach are as follows.(i)An interpretable capability evaluation model is constructed by employing BRB which can provide complete access to decision-makers.(ii)Key sub-capabilities are identified according to the quantitative contribution analysis results.(iii)Accountable capability improvement is carried out by only optimizing the identified key sub-capabilities.Case study results show that“Surveillance”,“Positioning”,and“Identification”are identified as key sub-capabilities with a summed contribution of 75.55%in an analytical and deducible fashion based on the interpretable capability evaluation model.As a result,the overall capability is improved by optimizing only the identified key sub-capabilities.The overall capability can be greatly improved from 59.20%to 81.80%with a minimum cost of 397.Furthermore,this paper also investigates how optimizing the BRB with more collected data would affect the evaluation results:only optimizing“Surveillance”and“Positioning”can also improve the overall capability to 81.34%with a cost of 370,which thus validates the efficiency of the proposed approach.

From Knowledge Transfer to Capability Development:The Future of PBL+CBL Teaching Method in Operating Room Nursing Education

Concomitant with the advancement of contemporary medical technology,the significance of perioperative nursing has been increasingly accentuated,necessitating elevated standards for the pedagogy of perioperative nursing.Presently,the PBL(problem-based learning)pedagogical approach,when integrated with CBL(case-based learning),has garnered considerable interest.An extensive literature review has been conducted to analyze the application of the PBL-CBL fusion in the education of perioperative nursing.Findings indicate that this integrative teaching methodology not only enhances students’theoretical knowledge,practical competencies,and collaborative skills but also contributes to the elevation of teaching quality.In conclusion,the PBL-CBL teaching approach holds immense potential for broader application in perioperative nursing education.Nevertheless,it is imperative to continually refine this combined pedagogical strategy to further enhance the caliber of perioperative nursing instruction and to cultivate a greater number of exceptional nursing professionals in the operating room setting.

基于概率的震级完备度方法评估云南地震台网的监测能力

为了科学评估云南地震台网的监测能力,分析云南地区的地震监测能力时空分布特征,采用基于概率的震级完备度(PMC)方法,利用2009-2023年云南地震台网地震目录、震相和台站信息等数据,计算了云南地震台网在云南地区的平均地震监测能力和在不同深度的监测能力,得到滇中、滇西局部地区的基于概率的完备性震级M_(P)=1.5,云南全境基本都能监测到2.5级地震。评估了研究时段内云南地震台网台站监测能力的演变,发现部分台站的监测能力持续下降。但自2018年增加20个台站后,云南2.0及2.5级地震的监测范围有一定的扩大,但微震监测能力提升不明显,可能是因为2018年以来云南一直处于小震弱活动状态。最后,对应用PMC方法规划提升台网监测能力进行了展望。

Process model of IT impacts on firm competitiveness based on application capability of information technology

To investigate the process of information technology （IT） impacts on firm competitiveness, an integrated process model of IT impacts on firm competitiveness is brought forward based on the process-oriented view, the resource-based view and the complementary resource view, which is comprised of an IT conversion process, an information system （IS） adoption process, an IS use process and a competition process. The application capability of IT plays the critical role, which determines the efficiency and effectiveness of the aforementioned four processes. The process model of IT impacts on firm competitiveness can also be used to explain why, under what situations and how IT can generate positive organizational outcomes, as well as theoretical bases for further empirical study.

Capability matchmaking of semantic web services with preconditions and effects

In order to solve the problem that the current matchmaking methods for semantic web service mainly focus on the matchmaking of IO （inputs, outputs） descriptions which may result in one-sidedness, a description-logic-based IOPE （inputs, outputs, preconditions, effects） description and matchmaking method is proposed for semantic web service. The description logic concept is used to annotate service IO and the description logic assertion is employed to describe service PE（preconditions, effects）. TBox subsumption checking is used to measure the subsumption relationship between IO descriptions of service request and advertising; ABox consistency checking is used for checking the logical implication between PE descriptions of service request and advertising. Based upon the logical implication, four kinds of PE matching degrees are proposed to measure and compare the pros and cons of the results of matchmaking. They are the exact, perfect, side-effect and common match. Experiments show that the method has a higher precision rate under the same recall rate compared with the existing method.

专精特新企业新产品开发绩效的组态效应研究——基于“能力-行为”匹配视角

专精特新企业对解决我国关键核心技术“卡脖子”问题具有重要意义,现有研究主要集中于创新机制和政策培育两方面,而新产品开发绩效作为专精特新企业可持续发展的重要途径,鲜有学者关注。为弥补现有研究不足,本文遵循“能力-行为”匹配视角,将数字化能力与服务化导向纳入同一研究框架,构建影响专精特新企业新产品开发绩效的组态效应模型。运用fsQCA方法对48家专精特新企业进行实证检验,检验结果表明:(1)数字化能力和服务化导向之间存在“多重并发”效应,可以通过4种不同的组合路径实现高新产品开发绩效;(2)将4种高新产品开发绩效组合路径进一步聚类,可归结为强数字化资源协调能力的能力拉动型和强产品导向服务化的服务推动型,这两种类型下数字化感知能力与客户导向服务化均具有替代效应。本文从“能力-行为”匹配视角丰富新产品开发绩效的前因组态,并为专精特新企业提升新产品开发绩效提供实践建议。

“消释力”诗学观考辨——济慈“Negative Capability”重译问题

约翰·济慈提出诗学概念"Negative Capability",其汉译众多。目前存在的汉译可分为四种情形,每种译法各有其优长和可借鉴之处。本文对该概念的种种汉译予以梳理、提出重译方式,并对这一诗学观的理解进行考辨。在对各种汉译进行分析总结的基础上,论文对济慈提出这一诗学概念的原本之意进行了解析,认为"Negative Capability"应译为"消释力",这一汉译可以更确切地反映诗人这一哲学思想的本义,也更符合汉语的表达习惯。而各种汉译在不同语境、不同时期都有其存在的意义和理论贡献。

基层全科医生常见病诊疗能力现状与能力提升需求调查

背景建立基层卫生“守门人”制度,实现基层首诊、有序分流是落实分级诊疗制度的关键,而实施基层首诊的关键在于基层医疗卫生队伍能力建设。目的了解湖南省基层全科医生的常见病诊疗能力、转诊和循证实践能力现状,并了解其能力提升培训的需求,为开展以需求为导向的培训提供依据。方法2023年4—5月采用便利抽样的方法,选取近5年在中南大学湘雅医院参加过住院医师规范化培训或全科医师转岗培训的基层全科医生为调查对象,采用自行设计的调查问卷,包括基本信息、常见病诊疗能力的自我评价、循证实践能力的自我评价、能力提升的需求四个部分,利用“问卷星”平台进行数据收集,采用描述性分析方法对结果进行呈现和描述。结果共收集到来自湖南省各个地级市、自治州的337份有效问卷,其中128份来自社区卫生服务中心,209份来自乡镇卫生机构。乡镇卫生机构与社区卫生服务中心全科医生的性别、年龄、职称、基层工作年限、编制情况比较,差异均有统计学意义(P<0.05)。调查结果显示,75.1%(253/337)的基层全科医生认为自己具备基层常见病的诊疗能力;16.6%(56/337)的医生表示对某些疾病能力欠缺,这些疾病的前六位为抑郁[89.3%(50/56)]、压力性尿失禁[69.6%(39/56)]、痴呆[66.1%(37/56)]、脑卒中[53.6%(30/56)]、共病[51.8%(29/56)]、结核[46.4%(26/56)],结果在社区全科医生和乡镇全科医生中相似。71.8%(242/337)的基层全科医生表示对转诊规范和流程不够熟悉。73.0%(246/337)的医生表示对循证医学不够了解,85.8%(247/288)的基层全科医生表示循证医学在日常诊疗中的应用有限。77.2%(260/337)的医生对基层常见病的诊疗指南不够了解;90.8%(306/337)的医生在决策困难时一般不会选择查找指南,其原因主要是认为指南不能解决复杂的病情[50.0%(153/306)]、不清楚获取指南的操作[43.1%(132/306)]和来源[34.3%(105/306)]等;目前获取诊疗指南的渠道主要是微信公众号平台[72.5%(237/327)]、知网等数据库[50.2%(164/327)]。97.0%(327/337)的基层全科医生对能力提升的培训有需求,并提出应根据基层需求个性化开展培训[60.8%(205/337)];期望的途径主要是上级医院进修[71.3%(233/327)]和高诊疗能力的基层医疗卫生机构培训[56.3%(184/327)];期望的培训项目主要是常见疾病[78.0%(263/337)]和多病共存[69.4%(234/337)]的规范诊疗和转诊。结论湖南省基层全科医生中大多数认为自己具备基层常见病的诊疗能力,但对抑郁、压力性尿失禁、痴呆、脑卒中、共病、结核等疾病的诊疗能力相对欠缺;大多数医生规范转诊、循证医学实践、指南检索和应用等能力有待提高,提示这些可作为能力提升培训的侧重项目。基层全科医生对培训的需求较高,主要希望通过去高诊疗能力的卫生机构进修学习,对基层常见疾病和多病共存的规范诊疗、转诊培训有较高需求,具体的培训方式和内容可在广泛了解基层需求后根据实际情况制定。

基于AHP-QFD的导航装备任务需求满足度评估方法

针对导航装备评估以往多受主观因素影响造成结果不准确的问题,提出了将层次分析法(AHP)与质量功能展开(QFD)结合使用,以任务需求满足度作为导航装备能力评估指标的评估方法。该方法通过定性分析与定量分析相结合的方式,基于导航装备保障任务-能力要求-战技指标的映射过程,提出确定映射域指标、计算作战保障能力重要度、确定关系矩阵、计算任务需求满足度的评估步骤,并给出需求满足度的计算方法;最后分析了陆上某方向北斗导航装备保障实例,结果表明了该方法的可行性,这对导航装备的性能优化和实际使用具有重要意义。

2022年泸定6.8级地震房屋震害及其统计分析

2022年四川省甘孜州泸定县发生6.8级地震。依据现场调查资料,介绍了震区房屋的主要结构类型及其建造特点,总结了各类房屋结构的典型震害现象,探讨了各类房屋典型震害特征的产生机理。通过震害数据的统计分析,建立了本次地震中各类结构房屋的震害矩阵,并与其他学者的研究成果进行了对比,研究了不同房屋类型各地震破坏等级分布规律,给出了砖混结构房屋的地震易损性曲线。根据本次地震的震害特点,给出了提升房屋抗震能力的建议。

Synthesis of spinel LiMn_(2)O_(4) microspheres with durable high rate capability

Spinel LiMn2O4 microspheres with durable high rate capability were synthesized by a facile route using spherical MnCO3 precursors as the self-supported templates, combined with the calcinations of LiNO3 at 700 °C for 8 h. The spherical MnCO3 precursors were obtained from the control of the crystallizing process of Mn2＋ ions and NH4HCO3 in aqueous solution. The effects of the mole ratio of the raw materials, reaction time, and reaction temperature on the morphology and yield of the MnCO3 were investigated. The as-synthesized MnCO3 and LiMn2O4 microspheres were characterized by powder X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. Galvanostatic charge/discharge tests indicate that the spinel LiMn2O4 microspheres deliver a discharge capacity of 90 mA-h/g at 10C rate show good capacity retention capability （75% of their initial capacity after 800 cycles at 10C rate）. The durable high rate capability suggests that the as-synthesized LiMn2O4 microspheres are promising cathode materials for high power lithium ion batteries.

一种新的Capability实现机制

1 引言 信息安全,除CPU、编译器和网络安全外,最重要的组成部分就是操作系统的安全核心.POSIX.1e[1]和POSIX.2c[2]分别定义了操作系统安全核心中可选的(alternative)和附加的(additional)安全机制Capability(命令与系统功能调用控制),MAC (Mandatory Access Control,强制访问控制),Audi (Security Auditing,安全审计),ACL(Access Control Lists,访问控制表),IL(Information Labeling,信息标签)的C接口和shell命令接口.但是对各种安全机制的精确语义和完全实现机制未做出定义.此外,文[1,2]还允许对各种安全机制所包含的内容进行扩充.

Coexistence Theory of Slag Structure and Its Application to Calculation of Oxidizing Capability of Slag Melts

The coexistence theory of slag structure and it's application to calculation of the oxidizing capabilities of slag melts is described. It is shown that the law of mass action can be widely applied to the calculation of oxidizing capabilities of slag melts in combination with the coexistence theory of slag structure.For slag melts containing basic oxides FeO and MnO, their oxidizing capabilities can be expressed by N Fe tO =N FeO +6N Fe 2O 3 , while for slag melts containing basic oxides CaO, MgO, etc., in addition to FeO and MnO, their oxidizing capabilities can be given as N Fe tO =N FeO +6N Fe 2O 3 +8N Fe 3O 4 .

Urban Hierarchy of Innovation Capability and Inter-city Linkages of Knowledge in Post-reform China

The 2000s has witnessed increasing interests in cities′role of innovation in the era of knowledge-based economy.Compared with substantial empirical analysis on the world city hierarchy of innovation,this paper attempts to examine the national urban hierarchy of innovation capability in China,in terms of ranking systems,spatial pattern and inter-city linkages of knowledge during the post-reform period since the late 1970s.Based on quantitative analysis such as principal component factor analysis and clustering analysis,this paper identifies the five-tier hierarchy of in-novation,which is headed by Beijing and Shanghai,followed by the capital cities of each province and regional centre cities.The development of China′s urban hierarchy of innovation capability has been driven by such factors as the scale of innovation,scientific scale,innovation potential and innovation environment.The paper further investigates the inter-city linkages of knowledge measured by the number of co-authored papers among the cities.Beijing is positioned in the central position of the knowledge diffusion and knowledge cooperation innovation.More knowledge diffusion among high level cities has occurred than that among the low level cities as well as between the low level cities and high level cities,and provincial capital cities and the regional central cities.

High pressure EIGA preparation and 3D printing capability of Ti-6Al-4V powder

Ti-6 Al-4 V alloy powder was processed by electrode induction melting gas atomization(EIGA)at high gas pressure(5.5-7.0 MPa).The effects of atomizing gas pressure on the powder characteristics and the microstructure,along with the mechanical properties of the as-fabricated block by laser melting deposition(LMD),were investigated.The results indicate that the diameters of powders are distributed in a wide range of sizes from 1 to 400μm,and the median powder size(d50)decreases with increasing gas pressure.The powders with a size fraction of 100-150μm obtained at gas pressures of 6.0 and 6.5 MPa have better flowability.The oxygen content is consistent with the change trend of gas pressure within a low range of 0.06%-0.20%.Specimens fabricated by LMD are mainly composed ofα+βgrains with a fine lamellar Widmanstatten structures and have the ultimate tensile strength(UTS)and yield strength of approximately 1100 and 1000 MPa,respectively.Furthermore,the atomized powders have a favorable 3 D printing capability,and the mechanical properties of Ti-6 Al-4 V alloys manufactured by LMD typically exceed those of their cast or wrought counterparts.

Correlation Between Soil Water Retention Capability and Soil Salt Content

The soil moisture retention capability of Chao soil and coastal saline Chao soil in Shandong and Zhejiang provinces were measured by pressure membrane method. The main factors influencing soil moisture retention capability were studied by the methods of correlation and path analyses. The results indicated that < 0.02mm physical clay and soil salt content were the main factors influencing soil moisture retention capability. At soil suction of 30-50 kpa, the soil salt content would be the dominant factor.

数字经济、创新能力与经济高质量发展

当前,中国经济已经由高速发展转向高质量发展,数字经济作为经济发展的新动能,正成为推动经济高质量发展的重要引擎。文章基于2011—2019年省级面板数据,通过构建综合评价指标体系,利用固定效应模型,从创新视角出发,探究数字经济影响高质量发展的内在机制。结果表明,数字经济有效推动了经济高质量发展;创新能力在其中发挥了正向调节作用。这种影响作用存在区域异质性,中西部地区相较于东部地区更为明显。因此,文章提出了加强科技创新,持续推进数字产业化和产业数字化建设,施行差异化数字转型策略,并加强风险防范的建议。

Comparison of the Observation Capability of an X-band Phased-array Radar with an X-band Doppler Radar and S-band Operational Radar

An X-band phased-array meteorological radar （XPAR） was developed in China and will be installed in an airplane to observe precipitation systems for research purposes.In order to examine the observational capability of the XPAR and to test the operating mode and calibration before installation in the airplane,a mobile X-band Doppler radar （XDR） and XPAR were installed at the same site to observe convective precipitation events.Nearby S-band operational radar （SA） data were also collected to examine the reflectivity bias of XPAR.An algorithm for quantitative analysis of reflectivity and velocity differences and radar sensitivity of XPAR is presented.The reflectivity and velocity biases of XPAR are examined with SA and XDR.Reflectivity sensitivities,the horizontal and vertical structures of reflectivity by the three radars are compared and analyzed.The results indicated that while the XPRA with different operating modes can capture the main characteristic of 3D structures of precipitation,and the averaged reflectivity differences between XPAR and XDR,and XDR and SA,were 0.4 dB and 6.6 dB on 13 July and-4.5 dB and 5.1 dB on 2 August 2012,respectively.The minimum observed reflectivities at a range of 50 km for XPAR,XDR and SA were about 15.4 dBZ,13.5 dBZ and-3.5 dBZ,respectively.The bias of velocity between XPAR and XDR was negligible.This study provides a possible method for the quantitative comparison of the XPAR data,as well as the sensitivity of reflectivity,calibration,gain and bias introduced by pulse compression.