Method for near-net forming of a sand mold with digital flexible extrusion technology

In order to further improve the precision forming efficiency of a sand mold digital patternless casting and reduce the amount of sand mold cutting, a method for near-net forming of the sand mold with digital flexible extrusion technology was put forward. The theory, optimization algorithm and technology for sand mold nearnet forming were studied. Experimental results show that the sand mold forming efficiency can be increased by 34%, and the molding sand can be reduced by 44%. The method for near-net forming of a sand mold with digital flexible extrusion technology can effectively promote the application of digital patternless casting technology in the mass production of castings and thus greatly improves the efficiency and automation of sand mold manufacturing.

Analysis on Pore-Forming Pouring Pile Construction Technology of House Building Project

Compared with the in-place pile, the pore-forming pouring pile is more simple and convenient, with a wider range of construction. In the actual construction process, it is able to pass through complex bottom layer and water layer underground without very high requirements in equipment. The actual bearing capacity of single pile is very strong, so that it can be better to adapt to the actual needs of different scales or the different geological conditions in building. And it has been promoted and used greatly in building construction work [1]. This paper introduces the concept of the pore-forming pouring pile technology, analyzes the pore-forming construction technology and the pile construction technology, then talks about prevention problems of the pore-forming pouring pile construction in House Building Project, at last draws a conclusion that the pore-forming pouring pile technology is the most basic construction technology and is the most effective and convenient way of construction.

New Technology “Flotation to Form Agglomerates and Magnetic Separation” Allows Great Breakthrough for World Low-Grade Light Rare Earth Ores

Rare earth resources are relatively scarce worldwide, but their global consumption is increasing year-by-year. At present, China has about 36% of the global rare earth reserves, but provides 90% of the world＇s supply, which has generally met world demand and promoted the development of the world economy. In order to continuously and stably supply rare earths to international markets, the Chinese Government has financially supported the Institute of Multipurpose Utilization of Mineral Resources within the China Geological Survey to study the utilization of low-grade rare earth ores. Following many years of experimental research, the project has developed a new technology entitled ＂Flotation to Form Agglomerates and then Magnetic Separation＂, which will bring a technological revolution to the world＇s light rare earth ore dressing.

Numerical simulation on the process of multi-point forming for tube

To apply the multi-point forming technology to the field of tube processing,the process of multi-point forming for tube is studied.Numerical simulation for the process of multi-point forming for tube is achieved by using elastic-plastic FEM in ABAQUS.During simulation,reasonable coefficient of mass scaling and friction model of penalty function are used.The influence of several major technological parameters on the process is analyzed.When the tube diameter is 60 mm and the forming curvature radius is 1000 mm,the distortion rate of cross-section and the absolute forming error gradually decrease with the increasing of tube wall thickness;However,when the tube wall thickness is constant,the smaller the curvature radius,the larger the distortion rate of cross-section,but as to forming part,its absolute forming error becomes smaller.

Compact intense electron-beam accelerators based on high energy density liquid pulse forming lines

This paper provides a review of the compact intense electron-beam accelerators (IEBAs) based on liquid pulse forming lines (PFLs) that havebeen developed at the National University of Defense Technology (NUDT) in China. The history and roadmap of the compact IEBAs used todrive high-power microwave (HPM) devices at NUDT are reviewed. The properties of both de-ionized water and glycerin as energy storagemedia are presented. Research into the breakdown properties of liquid dielectrics and the desire to maximize energy storage have resulted in theinvention of several coaxial PFLs with different electromagnetic structures, which are detailed in this paper. These high energy density liquidPFLs have been used to increase the performance of IEBA subsystems, based on which the SPARK (Single Pulse Accelerator with spark gaps)and HEART (High Energy-density Accelerator with Repetitive Transformer) series of IEBAs were constructed. This paper also discusses howthese compact IEBAs have been used to drive typical HPM devices and concludes by summarizing the associated achievements and theconclusions that can be drawn from the results.

Robust Broadband Beam-Forming Based on the Feature of Underwater Target Radiated Noise

To the problem of the unknown underwater target detection, according to the feature that the underwater target radiated noise contains the stable line spectrum, a weighted method based on the main-to-side lobe ratio （MSLR） is proposed for broadband beam-forming. This weighted method can be implemented by using the following steps. Firstly, optimize the spatial spectrum of each frequency unit by the second-order cone programming （SOCP）, and obtain the optimized spatial spectrum with lower side lobe. Secondly, construct weighting factors based on the MSLR of the optimized spatial spectrums to from weight factors. Lastly, cumulate the spatial spectrum of each frequency unit via the weight statistical method of this paper. This method can restrain the disturbance of background noise, enhance the output signal-to-noise ratio （SNR）, and overcome the difficulty of traditional four-dimensional display. The theoretical analysis and simulation results both verify that this method can well enhance the spatial spectrum of line spectrum units, restrain the spatial spectrum of background noise units, and improve the performance of the broadband beam-forming.

Critical Review of Literature on Radiologic Technology Education Program Evaluation

Curriculum has achieved a varied record of success in influencing health based practices and developing professional skills. Designing and implementing an effective radiologic technology educational program curriculum requires a disciplined pedagogical approach where the instructor performs a thorough situational analysis, develops a theory based and pragmatic learning plan, and implements a course of study in accordance with the established educational guidelines and requirements. Diligent efforts are needed to enhance the relationship amongst curriculum developers and evaluators. The collection of information at the formative stage: followed by process evaluation to assess implementation as the curriculum progresses, and summative evaluation to assess impact is required for accreditation of program in the United States by the Joint Review Committee for Education in Radiologic Technology. Formative evaluation research is used to enhance effectiveness of the curriculum, guide development of teaching and learning strategies, and reveal promising and ineffective components of curriculum. This review of literature provides evidence as to what is considered to be the best practice in the program evaluation/accreditation process.

中国塑性成形技术和装备30年的重大突破与进展

1994以来的30年,在国家重大需求的强劲牵引下,我国塑性成形技术与装备取得举世瞩目的巨大成就,研制出一大批世界第一的成形装备,实现了三大技术跨越,形成了规模最大的研究队伍,我国塑性成形技术总体水平进入世界先进国家行列,多个单项技术和装备达到国际领先水平。选择了其中8项最具代表性成果,并介绍其在塑性工程理论和技术上取得的重大突破以及对国家重大装备研制的突出贡献,分析了我国塑性成形技术与国际领先水平的差距。最后对我国塑性成形技术发展将呈现出的“三超两高”五大发展趋势进行了展望。

齿轮精密塑性成形理论技术装备研究与应用

齿轮是传动系统的核心基础件,被广泛应用于机械、汽车、航空航天装备等领域。齿轮传统制造技术为切削加工,其材料利用率低、加工周期长,特别是金属流线切断,损害齿轮性能,无法满足高端装备发展需求。齿轮精密塑性成形制造技术具有节能、节材、高效和优质等特点,是高性能齿轮技术发展方向。阐述了齿轮精密塑性成形理论方法,分析了国内外圆锥直齿轮、圆柱直齿轮和圆柱螺旋/斜齿轮精密成形技术特点;介绍了齿轮精密成形典型装备及产线,总结了齿轮无切削摆辗精密成形和锻造精密成形应用情况。此外,展示了圆锥螺旋齿轮多自由度包络成形和非圆齿轮锻造成形新方法,为高性能齿轮无切削成形制造技术装备研究与应用提供了参考。

钻爆法公路隧道防排水技术发展综述

为研究钻爆法公路隧道防排水技术的发展趋势和未来方向,系统梳理了防排水技术的发展历程、技术要求、设计施工和维护技术等内容,并对需要关注的问题及下一步发展方向进行展望。结果表明:按照隧道建设的技术发展水平,防排水技术可划分为圬工时代和后混凝土时代,已实现原则指导、设计优化、材料革新、施工控制、标准保障及运营维护的基本构架;中国在新修订的规范中增补了隧道渗漏水量化标准,使防水等级规定更具客观性、科学性;从防排水系统构造形式的对比情况看,控制排水型隧道能兼顾隧道衬砌水压力和维护隧道区生态平衡等多方面需求;钻爆法隧道防排水技术虽然增加了一些可维护性设计,但仍以功能性设计为主,且现有技术难以满足防排水系统的维护需求。应当注意:防排水技术是一个系统性问题,需要建立基于全寿命周期的建管养一体化防排水体系,并对防排水系统选型和控制型防排水技术进行系统性研究,通过对全寿命周期内隧道排水的环境影响进行分析评价,确定合理的防排水构造型式;另外,需加强防排水系统优化及新工艺研究,加快新型防排水材料的开发;同时要加强维护技术研究,尤其是可维护性技术和修复性技术研究。

中国式现代化视域下文旅元宇宙模式建构与路径创新研究

元宇宙是现代数字科技演化形成的数字文明新呈现方式,对我国数字文化强国建设具有重大意义。加快建设中国式现代化视域下的元宇宙数字文明,亟须文旅元宇宙的创新发展紧扣文化强国与数字中国重大战略部署,基于元宇宙技术进行集聚创新与优化,打造新型数字文明空间,在虚实共生中守正创新,推动中国特色社会主义文化的全景呈现。文旅产业是面向元宇宙的新型文化软实力,其创新发展应以文旅元宇宙模式建构为抓手,以创造人类文明新形态为模式目标,以促进人民共同富裕为模式基准,以丰富人民精神世界为模式内核,以满足高品质消费需求为模式支撑,以筑牢绿色旅游生态基底为模式保障,系统构建中国式现代化视域下的文旅元宇宙发展模式。此外,应通过供给侧、消费侧、创新侧、产业侧、生态侧打造文旅元宇宙推进路径,实现中国式文旅元宇宙的创新发展,以文旅元宇宙新场景、新业态与新模式,探索数字文明时代中国特色文化元宇宙的进路。

智慧停车投建营一体化策略研究

在当前停车供需矛盾突出的背景下,研究具有企业特色的智慧停车项目发展策略,针对智慧停车投资、建设、运营的全生命周期展开研究。在投资阶段通过基于投资成熟度的区域筛选模型,选择确定拟进入的城市投资智慧停车项目。在设计建设阶段通过多因素影响的停车场建设形式的决策,达到社会效益和经济效益的平衡。在运营阶段通过智慧停车系统的绿色低碳运营技术体系,提高运营效益。

市政污泥中重金属处置技术研究进展

论述了市政污泥中重金属的污染来源、污染现状及危害,着重阐述了市政污泥中重金属的处置技术及其优缺点,并对重金属处置的研究进行展望,为市政污泥中重金属污染治理的相关工作提供技术支持。

以DOPS为工具的形成性评价在免疫检验实习带教中的效果

目的探讨以操作技能直接观察评估(DOPS)为工具的形成性评价在免疫检验实习带教中的效果。方法选取2022年度和2023年度在浙江大学医学院附属第一医院免疫检验科实习的同学,2022年度的45名实习同学为对照组,2023年度的34名实习同学为实验组,对照组的同学在实习过程中使用传统教学终结性评价方法,实验组同学实习中使用以DOPS量表为工具的形成性评价方法。分析比较两组实习同学的出科考核成绩、教学的效果、实习收获调查、满意度调查。结果实验组的理论成绩和操作考核成绩明显高于对照组,差异均有统计学意义(t分别=-3.26、-4.31,P均<0.05);实验组的教学效果明显优于对照组,差异均有统计学意义(t分别=-6.31、-13.03、-12.01、-7.82、-10.22、-11.11,P均<0.05);实验组的实习收获评分高于对照组,差异均有统计学意义(t分别=-9.31、-8.33、-9.21、-7.76、-5.93,P均<0.05);实验组的满意度高于对照组。结论应用DOPS作为形成性评价工具能够帮助学生更好地掌握技能,带教老师也可以从中获得教学过程中的持续反馈,从而进一步提升免疫检验实习带教的效果和质量。

高分子材料智能制造技术专业新形态教材开发策略的研究与实践

职业教育“三教”改革正在往纵深推进,新形态教材是“三教”改革的物化成果。本文深入分析了新形态教材开发的意义,总结了新形态教材“三性一度”的内涵特征,并结合高分子材料智能制造技术专业教材开发实践提出了新形态教材“四融合”开发策略,为职业教育新形态教材开发提供思路与参考。

生物质成型技术及LH-600型生物质颗粒成型机设计

针对大型养殖场固体粪污、生物质秸秆、茶园茶梗、果园枝条、木屑及蘑菇渣等农业固体废弃物资源化利用过程中,生产生物质颗粒存在产量过低、设备故障率高、易堵塞模孔和成型率差等问题,研发设计了LH-600型生物质制粒成型机。对成型机喂料装置、颗粒成型装置、动力传动机构进行了创新设计,并利用Solidworks软件进行辅助设计。试验、工程实践应用表明,成型机具有使用寿命长、维护成本低、传动机构润滑降温效果好及高效节能等优点,适合大中型饲料加工厂、养殖场及有机肥厂使用。

基于空间变换技术的脉冲激光声信号检测

针对目前脉冲激光声信号检测方法极易受到环境噪声的影响,导致检测精确度不理想的问题。提出基于空间变换技术的脉冲激光声信号检测方法。首先,采用小波阈值法去除脉冲激光声信号中的噪声;其次,利用球傅里叶空间变换技术对声信号中的声源展开定位,获取声信号的准确位置;最后,分别提取声信号中的比值特征、比重特征、频率特征三种参数,在此基础上通过SVM算法对其展开分类识别,以此实现脉冲激光声信号的有效检测。实验结果表明,所提方法的声信号检测精度超过96%。

信息时代背景下中国数字绘画艺术发展路径探析

数字绘画艺术是信息时代下科技与艺术碰撞融合的产物,自20世纪80年代末进入中国以来迅速发展、渐趋成熟。其极富表现力和传播性的特点,不仅极大地拓宽了大众对绘画艺术的认知、提升了民众的艺术审美能力,更被应用于诸多领域。然而,近年来我国数字绘画艺术出现了过度产业化、缺乏理论创新等问题。在大力倡导文化自信的时代背景下,通过艺术与科技深度融合的实践探索,将中国优秀传统文化元素融入理论创新与实践创作,以期不断凝练我国数字绘画艺术的本土特性,彰显新时代中国式数字绘画艺术风格。

基于人群动态视觉关注度的城市滨水界面形态评价与分析模型构建——以南京青奥片区为例

【目的】滨水城市空间因独特的地理区位优势及形态特征,成为彰显城市特色风貌、品质及美好人居环境的重要空间载体之一。滨水界面是滨水空间塑造的重要核心对象,尤其在存量更新背景下,贴近人群视觉关注方式的动态视觉评价有助于从公众视觉需求角度厘清公众对滨水空间及滨水界面的品质诉求。【方法】以南京河西滨江青奥片区为例,借助倾斜摄影测量、实景数据影像采集、城市滨水界面形态分析、眼动仪生理眼动指标监测等技术方法,建构“关注度-界面”的关联机制,厘清不同运动方式下游览者的视觉关注特征与滨水界面形态各项指标的相关性与影响程度。【结果】发现滨水空间游览者的视觉关注度受建筑占空度、界面层次数量、轮廓起伏频率与轮廓起伏频度的正向影响;在不同运动方式下“关注度-界面”的指标关联情况各异。【结论】完成对城市滨水界面形态与人群动态视觉关注度关联机制的建构,可强化城市滨水界面对人群的有序引导,并为相关空间布局和规划决策提供有力支撑。

“机械制造技术基础”进程式智慧课堂教学质量评价体系设计研究

工程认证要求评价体系能够准确、全面地评估学生的综合素质和能力,反映学生在各个方面的学习成果和发展情况。进程式智慧课堂评价体系可以提供客观的评价标准,支持学生实践能力培养并提供个性化评价和指导。从深度学习的视角分析了“机械制造技术基础”智慧课堂教学的特点。在此基础上,构建了“机械制造技术基础”智慧课堂教学评价维度,并设计了相应的质量评价指标体系,为推进“机械制造技术基础”智慧课堂教学提供参考。