Construction of University Librarian Team in the Context of Double First-Class Initiative

Data services,knowledge services,and information services are the core service elements of university libraries in the context of the Double First-Class Initiative.Combined with the current situation of insufficient overall service capacity of libraries,this paper proposed strategies and implementation paths for optimizing the service system from three aspects:the construction of the professional qualification system for librarians,the establishment of post institutions,and the construction of library culture.Long-term path:putting library human resource management into the legal track,taking the lead in local legislation,and promoting the construction of library legislation and professional qualification certification system;optimizing the personnel system,implementing hierarchical management and classified assessment for professional librarians and auxiliary librarians.Short-term path:intensive post allocation,namely,assigning the core strength in the core post,and tackling the temporary major work combining multiple forces in the form of a"working group";building an open knowledge service ecosystem,accelerate the cross-border integration of libraries and other organizations,and striving to build the core competitiveness of libraries.

Dynamic responses of reinforced concrete beams under double-endinitiated close-in explosion

The reinforced concrete(RC) structural component might suffer a great damage under close-in explosion.Different from distant explosions, blast loads generated by the close-in explosion are non-uniformly distributed on the structural component and may cause both local and structural failure. In this study,an experimental study was conducted to investigate the dynamic responses of RC beams under doubleend-initiated close-in explosions. The experimental results show that the distribution of blast loads generated by the double-end-initiated explosion is much more non-uniform than those generated by single-point detonation, which is caused by the self-Mach-reflection effects. A 3 D finite element model was developed and validated in LS-DYNA by employing the modified K&C model. Intensive numerical calculations were conducted to study the influences of the initiation way, scaled distance and longitudinal reinforcement ratio on the dynamic responses and failure modes of RC beams. Numerical results show that the RC beam suffers greater damage as the cylindrical explosive is detonated at its double ends than the scenario in which the cylindrical explosive is detonated at its central point. RC beams mainly suffer flexural failure and flexure-shear failure under the double-end close-in explosion, and the failure modes of RC beams change from the flexural damage to flexure-shear damage as the scaled distance or the longitudinal reinforcement ratio decreases. The direct shear failure mode is not usually observed in the double-end-initiated explosion, since the intense blast loads is basically concentrated in the midspan of RC beam, which is due to self-Mach-reflection enhancement.

The effect of electron initial longitudinal velocity on the non-sequential double ionization process in an elliptically polarized laser field

The effect of initial longitudinal velocity of the tunnelled electron on the non-sequential double ionization （NSDI） process in an elliptically polarized laser field is studied by a semiclassical model. We find that the non-zero initial longitudinal velocity has a suppressing effect on single-return collision （SRC） events in the double ionization process, more specifically, it results in an obvious reduction in the center part of the correlation momentum distributions in the direction of the major polarization axis （z axis） and makes the distribution of single-return collision in the minor polarization axis （x axis） become narrower.

A study on the surface overpressure distribution and formation of a double curvature liner under a two-point initiation

The formation mechanism of an EFP(explosively formed projectile)using a double curvature liner under the overpressure effect generated by a regular oblique reflection was investigated in this paper.Based on the detonation wave propagation theory,the change of the incident angle of the detonation wave collision at different positions and the distribution area of the overpressure on the surface of the liner were calculated.Three dimensional numerical simulations of the formation process of the EFP with tail.as well as the ability to penetrate 45#steel were performed using LS-DYNA software,and the EFP ve locity,the penetration ability,and the forming were assessed via experiments and x_ray photographs.The experimental results coincides with those of the simulations.Results indicate that the collision of the detonation wave was controlled to be a regular oblique reflection acting on the liner by setting the di-mensions of the unit charge and maintai ning the pressure at the collision point region at more than 2.4 times the CJ detonation when the incident angle approached the cnitical angle.The distance from the liner midline to the boundary of the area within which the pressure ratio of the regular oblique reflection pressure to the qJ detonation pressure was greater than 2.5,2,and 15was approximately 0.66 mm,132 mm,and 3.3 mm,respectively.Itis noted that pressure gradient caused the liner to turn inside out in the middle to form the head of the EFP and close the two tails of the EFP at approximately 120μs.The penetration depth of the EFP into a 45#steel target exceeded 30 mm,and there was radial expansion between the head and tail of the EFP,increasing the penetration resistance of the EFP.Therefore,the structural size of the unit charge and the liner can be further optimized to reduce resist ance to increase the penetration ability of the EFP.

Build an International Teaching Resource Construction System and Practice International Talent Training in the Context of “Double First-class” ——Take the School of Software of Northwestern Polytechnical University Case as an Example

From the perspective of the development of world-class universities,internationalization is an essential strategic choice and external feature,and also an inevitable choice to improve the discourse power and competitiveness of international higher education.In line with the national“double first-class”international development strategy of higher education,based on the cultivation of students’overall quality,the improvement of teachers’professional ability,and the development of school’s improvement of quality and efficiency,we School of Software,Northwestern Polytechnical University,explore new ideas and new measures for the cultivation of international software engineering talents,build a set of international teaching resources construction system,to form a reference standard and scheme for the cultivation of international software engineering talents.At present,we have achieved excellent results.

Research on the Curriculum System of Software Engineering under the Background of“Double First-Class”Construction

To build the top class of higher education by focusing on the goal of the“Double First-Class”,it needs to analyze the defect and deficiency and identify the demand for the training of the talent under the background of“Double First-Class”.Considering of those issues,it is suggested that building the curriculum system scientifically and rationally in following aspects:deepening the training objectives,professionalizing the structure and contents of the curriculum system,optimizing the content,enhancing the construction of practical education system and internationalizing the curriculum system.Also,with those aspects,a reference is provided for the cultivation of talents with innovative consciousness and ability to solve complex engineering problems under the background of the“Double First-Class”construction.

Research on Striving for Double First-Class Universities

The construction of“double first-class”universities is the strategic goal of the development of Chinese universities in the new period.On the basis of fully researching the domestic“double first-class”talent training model,this paper builds a new type of talent training model with Chinese characteristics suitable for the“double first-class”development requirements through reference,digestion,comparison and integration,hoping to further improve universities Quality of teaching.

An Improved Double r-iteration IOD Method for GEO UCTs Based on SBSS System

The purpose of initial orbit determination,especially in the case of angles-only data for observation,is to obtain an initial estimate that is close enough to the true orbit to enable subsequent precision orbit determination processing to be successful.However,the classical angles-only initial orbit determination methods cannot deal with the observation data whose Earth-central angle is larger than 360°.In this paper,an improved double r-iteration initial orbit determination method to deal with the above case is presented to monitor geosynchronous Earth orbit objects for a spacebased surveillance system.Simulation results indicate that the improved double r-iteration method is feasible,and the accuracy of the obtained initial orbit meets the requirements of re-acquiring the object.

Research on Angular Output Velocity of a Drive Shaft with Double Cross Universal Joints

The study object is the angular output velocity of the drive shaft which is made up of two series-wound cross universal joints. We have deduced the function relation between the angular output velocity and initiative input angle of the drive shaft with double cross universal joints that is based on the calculation formula of the angular output velocity of a single cross universal joint, and by analyzing the relation between the two input angles. By using this function relation, the constant velocity condition of the drive shaft with double cross universal joints＂ is verified. The step-by-step searching algorithm is adopted to obtain the optimal phase angle that leads to the minimum fluctuate index of the angular output velocity in the vary velocity condition. At the same time, we worked out the maximal and minimum value of the angular output velocity, and their initiative input angle. The correctness of the function of the angular output velocity and the step-by-step search algorithm are verified by an ADAMS simulation example.

Asymptotic Behavior of Global Solutions for Double Degenerate Nonlinear Parabolic Equation

In this paper we study the decay estimate of global solutions to the initial-boundary value problem for double degenerate nonlinear parabolic equation by using a dif-ference inequality.

“三创五育”背景下“双一流”高校本科人才培养的DIE模式初探及评价

针对新时代背景下“双一流”高校人才培养的发展需求,在“三创五育”理念指导下,解析基于产学研合作理论引入的DIE模式的内涵,系统阐述了DIE理念贯彻下的教学系统设计并付诸实践,旨在打破教学系、研究所、企业之间的壁垒,为学生学习、实践提供更多样化的渠道。问卷调查结果表明DIE模式在本科生团队协作、学术创造、自信心树立等方面有切实作用,为培养全面发展的高素质本科人才提供了参考。

双柱悬索拉线塔风致倒塌易损性分析

作为风敏感结构,双柱悬索拉线塔在强风荷载作用下易遭受不同程度的损伤甚至发生倒塌破坏,因此,有必要对其进行风灾易损性分析。为此,本文提出一种双柱悬索拉线塔风致倒塌易损性分析方法。首先,考虑结构参数的不确定性,基于拉丁超立方抽样建立双柱悬索拉线塔不确定性模型,完成所有样本模型的非线性静力推覆分析;然后,利用B-R准则和对数正态分布函数拟合得到双柱悬索拉线塔倒塌易损性曲线;最后,研究风向角和拉线初张力对结构倒塌易损性曲线的影响。研究结果表明:相较于确定性倒塌分析,不确定性倒塌分析能够更好地评估双柱悬索拉线塔的抗风承载能力;风向角对双柱悬索拉线塔的倒塌易损性影响较大,结构的最不利风向角为45°,当基本风速小于56.5 m/s时,结构在任一风向角下的倒塌概率都很小;拉线初张力对结构倒塌临界风速无影响,但对立柱顶点位移易损性曲线影响较大;增大拉线初张力,左右侧立柱的顶点位移易损性曲线均向左移动,且其对背风侧立柱的影响更大。

澳大利亚新南威尔士大学战略规划的政策变迁研究

基于历史制度主义的理论视角,审视新南威尔士大学卓越发展的基本政策框架和主要实践行动,发现该校在政策变迁中综合运用制度微调、制度置换、制度转换等三种方式赋能育人、创新、内涵等三个层面,协同推进大学战略目标的达成。参考新南威尔士大学的成功经验,我国大学应立足高等教育的阶段性特征,基于动态循证来合理把握政策调整的时机、路向与模式,关注育人本质的变革、创新模式的革新、内涵要素的协同,有效实现卓越发展的愿景。

300 m^(2)级5车道隧道九硐室施工力学特性数值计算

针对深圳侨城东路宝鹏大型地下互通式立交涉及的300 m^(2)级5车道超大断面隧道,开展施工技术方案及结构受力研究.首先,提出一套“分硐室开挖+衬砌加强支护”的超大断面隧道九硐室开挖施工技术.然后,结合隧道几何尺寸及支护方案,建立Midas三维有限元数值计算模型探究5车道超大断面隧道开挖施工动态力学响应特性.最后,提取隧道各分部结构应力云图,统计特征测点应力及位移监测曲线.研究结果表明:施工期间需采用超前小导管+管棚注浆措施对围岩进行预加固;现场需通过双侧壁导坑+双临时横撑构成九硐室开挖工法,并采用双层初期支护+加强加厚二次衬砌支护方案;现场开挖施工后结构应力与位移呈现快速增加趋势,而后隧掌子面不断前移各统计曲线逐步趋于平稳;围岩压力峰值可达2.01 MPa,拱顶位置超前小导管内力值最大为10 kN,两侧拱腰位置管棚内力最高为20 kN,拱腰及拱脚位置钢拱架内力最大为113 kN,拱肩位置锁脚锚杆内力在第66开挖施工步达到18 kN;初支结构测点应力峰值为2.4 MPa;初支拱顶、拱肩部位沉降峰值分别为12.4、6.8 mm;管棚、锁脚锚杆等结构联合支护效果明显.

不同光引发剂口腔复合树脂单体的设计合成及性能

背景:目前由树脂基质单体组成的牙科复合树脂充填物,是牙体缺损充填治疗的首选材料,但随着其在口腔环境中使用时间的延长,牙体组织继发龋以及充填材料磨损折断等问题随之而来,造成这些问题的主要原因是充填材料的聚合收缩及其与牙体组织的机械性能不匹配等。目的:通过加入不同组分的引发剂合成牙科新型复合树脂单体,以提升传统体系的双键转化率并进一步提高材料的力学性能。方法:将不同的引发剂加入3,3′,5,5′-四甲基联苯二酚型环氧丙烯酸酯树脂单体中,制备新型复合树脂基质体系:A组加入质量分数1.1%的樟脑醌,B组加入质量分数2.1%的1-苯基-1,2-丙二酮,C组加入质量分数3.1%的樟脑醌与1-苯基-1,2-丙二酮混合物(二者质量比为1∶1)。检测各组样品的双键转化率、聚合收缩率和机械性能。结果与结论:①B、C组双键转化率高于A组(P<0.05);B组聚合收缩率大于A组(P<0.05),C组聚合收缩率小于A组(P<0.05);②B、C组的挠曲强度、弹性模量、压缩强度均大于A组(P<0.05,P<0.01),B组的维氏硬度大于A组(P<0.05),C组的维氏硬度小于A组(P<0.01);③结果显示,1-苯基-1,2-丙二酮是一种性能较理想的引发剂,且1-苯基-1,2-丙二酮与樟脑醌联合应用可有效提高树脂基质体系的双键转化率,从而提高树脂的力学性能。

基于气泡统一方程的声场双气泡耦合作用研究

针对声致空化现象中双气泡相互作用力展开了研究。本文基于气泡动力学的基本理论,将气泡统一方程应用到声场中双气泡的耦合作用研究中,建立了可用于计算声场中多气泡耦合的理论模型,并以此研究了不同类型的声场中双气泡次Bjerknes力的变化趋势。研究结果表明:在声压幅值较小的行进波声场中,对于非线性脉动的双气泡,其相互作用现象不仅与声场参数相关,还会受到双气泡初始体积比的影响。若固定其中一个气泡的初始体积,同时改变另一个气泡的初始体积,则双气泡间第1周期内的次Bjerknes力会在初始体积相等时达到第1个极值,随后呈现周期性的起伏,并在总体上呈增大趋势;而双气泡相互作用在声压幅值较大的行进波声场中会随初始半径比的增大持续增强,且周期性的起伏现象并不明显。在驻波声场中靠近波节的位置也能观测到这一现象。此外,本文还探究了非线性振动的双气泡在具有相同频率、不同声压幅值的组合波声场中的耦合效应。本文的研究可为声场中双气泡相互耦合作用以及气泡群动力学相关应用提供理论基础。

“双一流”背景下体育硕士专业学位研究生培养质量提升路径

世界一流大学和世界一流学科是提高高等教育建设的一大国家战略,简称“双一流”,对全日制体育硕士专业学位研究生提出了新的发展要求,如何提升体育专业硕士的培养质量,已经成为时代的要求。为了提高体育专业硕士培养质量,该文运用文献资料法和逻辑分析法,以“双一流”建设为出发点,对体育专业硕士培养质量的现状作出深入研究,并提出培养质量提升路径,旨在提高体育专硕的培养质量,培养拔尖创新人才。

高校基层党组织重构赋能学科高质量发展探析

“支部建在学科上”是对毛泽东“支部建在连上”建党建军思想在大学的创造性探索,是新时代高等教育基层党组织的有效组织形式和高校基层党建引领事业高质量发展的理路选择,是推进“双一流”建设的有效组织保障。从思想源头、制度延伸、问题导向三个维度,论述了高校实行“支部建在学科上”党建工作模式的可行性和必要性;从学科与支部两个基层组织的视角,阐述了其内涵特征及组织特性;从具体实践角度出发,围绕根本原则、两对关系、三个主体职责、四个相融等四个方面提出了“支部建在学科上”的“1234工作法”,是高校基层党组织赋能学科高质量发展的积极探索。

基于双端初始电流行波时频矩阵相似度的柔性直流输电线路保护原理

针对目前柔性直流(voltage source converter-based high voltage DC,VSC-HVDC)电网的线路保护中存在的问题,提出一种基于双端初始电流行波(Initial current traveling wave,ICTW)时频矩阵相似度的柔性直流输电线路保护原理。首先,对柔性直流电网在线路区内外故障下两端保护所在处ICTW的故障特性进行分析,总结出在特定时间窗内,区内故障下两端ICTW的频域相似度远高于区外故障。在此基础上,利用S变换对双端ICTW进行时频分析,建立时频矩阵,并对其做奇异值分解(singular value decomposition,SVD)。然后根据特征矩阵构造双端ICTW的相似度计算公式,以该相似度的大小判别线路区内外故障。另外,根据线路两端ICTW的高低频能量比识别雷击干扰。最后,各种故障情况下的仿真结果表明,该保护原理不依赖线路边界元件,可以保护不同长度线路的全长,具有更高的耐过渡电阻和抗噪声能力,并且能够满足柔性直流电网主保护的速动性要求。

“一带一路”倡议对中国节点城市经济高质量的影响——基于产业结构升级的中介效应检验

“一带一路”倡议是推动经济高质量发展的重要组成部分,同时,也是“双循环”新发展格局下中国产业结构变迁的新动力。基于2003—2019年267个地级市的面板数据,构建经济高质量指标,利用双重差分模型重点分析“一带一路”倡议的发起对中国经济高质量发展的作用和影响,并选取产业结构作为中介指标探讨该倡议对经济高质量发展的影响路径。研究结果表明:“一带一路”倡议能够通过产业结构升级促进中国经济高质量发展;“一带一路”倡议对中国东部经济高质量的影响效果较中部和西部更强,且产业结构升级的中介效应东部较西部地区更显著,中部地区无明显中介效应。