A novel approach of jet polishing for interior surface of small-grooved components using three developed setups

It is a challenge to polish the interior surface of an additively manufactured component with complex structures and groove sizes less than 1 mm.Traditional polishing methods are disabled to polish the component,meanwhile keeping the structure intact.To overcome this challenge,small-grooved components made of aluminum alloy with sizes less than 1 mm were fabricated by a custom-made printer.A novel approach to multi-phase jet(MPJ)polishing is proposed,utilizing a self-developed polisher that incorporates solid,liquid,and gas phases.In contrast,abrasive air jet(AAJ)polishing is recommended,employing a customized polisher that combines solid and gas phases.After jet polishing,surface roughness(Sa)on the interior surface of grooves decreases from pristine 8.596μm to 0.701μm and 0.336μm via AAJ polishing and MPJ polishing,respectively,and Sa reduces 92%and 96%,correspondingly.Furthermore,a formula defining the relationship between linear energy density and unit defect volume has been developed.The optimized parameters in additive manufacturing are that linear energy density varies from 0.135 J mm^(-1)to 0.22 J mm^(-1).The unit area defect volume achieved via the optimized parameters decreases to 1/12 of that achieved via non-optimized ones.Computational fluid dynamics simulation results reveal that material is removed by shear stress,and the alumina abrasives experience multiple collisions with the defects on the heat pipe groove,resulting in uniform material removal.This is in good agreement with the experimental results.The novel proposed setups,approach,and findings provide new insights into manufacturing complex-structured components,polishing the small-grooved structure,and keeping it unbroken.

THE INTERIOR TRANSMISSION EIGENVALUE PROBLEM FOR AN ANISOTROPIC MEDIUM BY A PARTIALLY COATED BOUNDARY

We consider the interior transmission eigenvalue problem corresponding to the scattering for an anisotropic medium of the scalar Helmholtz equation in the case where the boundary?Ωis split into two disjoint parts and possesses different transmission conditions.Using the variational method,we obtain the well posedness of the interior transmission problem,which plays an important role in the proof of the discreteness of eigenvalues.Then we achieve the existence of an infinite discrete set of transmission eigenvalues provided that n≡1,where a fourth order differential operator is applied.In the case of n■1,we show the discreteness of the transmission eigenvalues under restrictive assumptions by the analytic Fredholm theory and the T-coercive method.

Mapping the Child’s Grey Interior:Authenticity of Plague Narrative in The Great Plague

The Great Plague:The Diary of Alice Paynton,London 1665-1666 adopts the realistic painting style and direct writing to the painful experience,describes the situation of the Great Plague in London truly from the perspective of children,and breaks people’s cognitive expectation of children’s literature,the construction of children’s Gray inner world is completed behind the true description of the Great Plague in London with the true brushwork,which presents a different world of childlike innocence.Despite the importance of epidemics writing in literature,the child’s diary perspective of them is one of the least developed of Plague Narrative.Only when authenticity and the child’s grey interior are integrated will we reveal a true picture of society as it was.

The Non-Singular Fast Terminal Sliding Mode Control of Interior Permanent Magnet Synchronous Motor Based on Deep Flux Weakening Switching Point Tracking

This paper presents a novel non-singular fast terminal sliding mode control(NFTSMC)based on the deep flux weakening switching point tracking method in order to improve the control performance of permanent interior magnet synchronous motor(IPMSM)drive systems.The mathematical model of flux weakening(FW)control is established,and the deep flux weakening switching point is calculated accurately by analyzing the relationship between the torque curve and voltage decline curve.Next,a second-order NFTSMC is designed for the speed loop controller to ensure that the system converges to the equilibrium state in finite time.Then,an extended sliding mode disturbance observer(ESMDO)is designed to estimate the uncertainty of the system.Finally,compared with both the PI control and sliding mode control(SMC)by simulations and experiments with different working conditions,the method proposed has the merits of accelerating convergence,improving steady-state accuracy,and minimizing the current and torque pulsation.

Reform and Practice of Talent Training of Architectural Interior Design Professionals in Higher Vocational Skills Competition: Taking Chongqing Energy Vocational College as an Example

For higher vocational colleges,skills competition is an important indicator of professional personnel training quality.In this paper,the architectural interior design professional skills competition in Chongqing Energy Vocational College is taken as an example,the many years of teaching and competition experience are taken into account,the problems existing in the cultivation of architectural interior design professionals in higher vocational colleges are analyzed,and corresponding solutions are proposed.

Research on the Interior Decoration Characteristics of Peking Union Medical College Phase I Project

Peking Union Medical College was founded in the late Qing Dynasty and the early Republic of China.Since then,society and politics have been rapidly changing,and its architectural aesthetics reflect the idea of advocating the West and inheriting tradition.Through research and actual investigation,this paper summarizes the current status of its building from two aspects,interior decoration art and interior decoration technology,analyzes the interior decoration characteristics of Peking Union Medical College Phase I Project,and records the archives of Peking Union Medical College’s decoration technology.

Ideological and Political Integration Strategies in Interior Design Professional Courses Under the Background of Innovation and Entrepreneurship

Based on the ideological and political requirements of interior design professional courses,exploring the integrated education path of professional plus innovation and entrepreneurship requires first expanding the ideological and political content of professional introductory courses,core courses,and expanded courses.Then,we will reshape the curriculum system based on the principle of connecting professional teaching and ideological and political courses,focusing on the realistic principle of talent needs,striving for student growth,adjusting the course content,optimizing the teaching model,and transforming teaching through in-and out-of-class practice and counterpoint guidance.

Teaching Strategy of Higher Vocational Interior Design Based on “Internet Plus” Thinking

“Internet Plus”thinking has been widely adopted in the teaching of interior design in colleges and universities,and its application has significant implications that cannot be disregarded.“Internet Plus”thinking not only realizes the innovation of interior design teaching but also significantly improves the level and quality of teaching.Through an analysis of the advantages of“Internet Plus”education platform and the current situation of higher vocational interior design teaching,effective strategies for higher vocational interior design teaching based on“Internet Plus”thinking are proposed in this paper in hope that this study will contribute to the efficient development of interior design teaching activities.

基于场所精神的建筑室内空间设计研究

人与场所交互对话方式是近年来设计者研究的主要方向。建筑室内空间作为人们物质和精神生活的场所,传递着一种生活方式的态度。建筑室内空间的场所精神,映射出社会环境与生产方式多维度空间行为体验逻辑价值认同的特定意义。文章结合场所精神的行为体验研究,通过对“人”的需求尊重来诠释建筑室内空间场所设计的“内在精神气质”,强化人与环境互动的双向作用生成,实现场所空间营造内在价值的有效途径。

基于川南建筑特色的会馆室内装饰设计研究——以夕佳山民居为例

以夕佳山民居为代表的川南建筑具有独特的地域特色,其装饰元素往往具有平安吉祥、多福健康等美好寓意,代表着人们对美好生活的向往。对其地域文化和建筑艺术特征进行了分析叙述,将具有地域特色的夕佳山传统民居建筑元素和会馆室内设计相结合,从形、色、材几个方面进行装饰方法探讨。在设计应用中,根据会馆的文化属性,从消费者的实际需求出发,注重不脱离装饰外形所依附的内在文化和内在精神价值,利用新材料新技术作为突破点,以传承和创新两个方向探讨结合的设计策略,在会馆室内设计中传承创新川南地域文化。

杨燕教授从肺论治儿童功能性便秘的临床经验

儿童功能性便秘约占小儿便秘的95%以上,是小儿消化系统的常见病,病程迁延易对儿童的身心健康产生严重影响。文章总结杨燕教授治疗儿童功能性便秘的临床经验。杨燕教授认为便秘的病机主要是大肠的传导功能失常,但与肺脏密切相关。肺与大肠相表里,肺气亏虚或肺气郁闭,宣肃失职,气机不畅,津液疏布失常,肺热移于大肠,肠失濡润,均可导致便秘发生。从肺论治,临证采用塞因塞用之法补气启闭治虚秘,提壶揭盖之法理肺通腑治实秘,同时重视良好的饮食结构及日常护理,临床疗效显著。附验案1则以佐证。

地域文化影响下的乡村民宿室内设计探析

随着社会经济的飞快发展,人们的生活水平越来越高,对待生活的态度也随之转变。在此背景下,具有地域文化特色的休闲度假游备受人们青睐。乡村民宿设计作为展示地域文化的载体,承担着传播地域文化的责任和使命,在其室内设计中表达地域文化则尤为重要。因此,文章以地域文化为切入点,综合考虑乡村民宿室内设计的需求,探究两者之间的关系,不仅能够切实有效地满足游客的体验性需求,提升游客的满意度,又有利于地域文化的传承,同时还可以提高乡村民宿室内设计的文化底蕴。

基于“心肠合治法”论乌梅丸

“心肠合治法”理论起源可追溯至《黄帝内经》,阐释了心与小肠在生理和病理上的相互影响,近年来,研究者多从“颅脑肠脑说”“心与肠道菌群说”“肠道菌群-脑-肠轴”等方面进行研究,证实了“心与小肠相表里”学说的科学性,从而也证明了“心肠合治法”在临床中的可行性、重要性。该文中“心”即心、脑、血脉,包括现代医学中的心血管系统、神经系统等,“肠”即小肠,包括消化系统中的十二指肠、空肠、回肠等。“心肠合治法”是一种很重要但未被重视起来的治疗思路,而乌梅丸即“心肠合治法”的代表方剂,在临床中常被用来治疗心系与肠系病。故该文就“心肠合治法”理论渊源、现代研究机制及其临床运用的研究概况进行探讨,以期从更多角度探究乌梅丸的配伍规律及临床应用。

采用生理响度感知机制的车内噪声声品质预测

现有车内噪声声品质预测的响度计算中没有考虑真实人耳生理解剖结构的传声特性,因此提出了一种基于生理响度感知模型的车内噪声声品质预估方法。首先,采集两款轿车的车内噪声样本,并通过主观评价试验得到车内噪声的主观评价烦恼度。之后,整合中耳集总参数模型与耳蜗传输线模型,构建生理响度模型。然后,以生理响度模型的响度计算值为主要参数,结合尖锐度、粗糙度与车内噪声的主观评价值,通过TabNet模型构建了车辆声品质预测模型。最终,对比分析了所构建声品质模型与基于现有标准响度模型所构建的声品质模型的预测效果。结果表明,采用生理响度模型的声品质预测平均误差百分比仅有4.73%,优于采用Moore响度(6.13%)与Zwicker响度(6.94%)的声品质预测结果。此外,所构建的TabNet声品质预测模型的平均误差百分比也低于基于BP神经网络模型的平均误差百分比(7.60%)。采用生理响度模型的TabNet声品质预测能够提高车内噪声声品质客观评价的准确率。

皮革材料装饰艺术在现代室内设计中的运用分析

对室内装饰材料科学、合理地选用,并加以适当的美术设计和工艺处理,能够大幅提高室内装修的高级感。皮革是一种常用的家居装饰材料,具有坚韧、耐磨、易清洗等优异的物理特性,对提高家居产品的美观性与舒适度具有重要意义。文章从应用原则、设计意义、具体应用及设计策略等维度就皮革材料装饰艺术在现代室内设计中的运用展开研究探讨。

海洋石油平台生产分离器改造技术应用

生产分离器是天然气生产平台最关键的设备,其分离效果直接影响气田产量以及下游设备的稳定性。因井口数量增加,南海东部某平台生产分离器分液能力不足、气液分离效果不佳,使得下游设备稳定性变差。根据降低生产分离器操作压力后预测的配产数据,对生产分离器内件进行改造。结果表明,经过内件改造后的生产分离器处理能力大幅提升,且降低了设备本身的操作温度,大大提高了设备的操作性能,达到了降本增效的目的。

一种双级弹射作动筒对抛分离输出特性研究

为满足武器系统低过载对抛分离功能要求,设计了一种对抛式双级弹射作动筒,基于零维内弹道理论建立了对抛式双级弹射作动筒内弹道模型,对其分离输出特性进行了仿真,并对内弹道模型的准确性进行了试验验证。结果表明,对抛式双级弹射作动筒内弹道模型准确可靠,压强仿真曲线与实测曲线基本吻合,分离输出参数仿真值与实测值基本一致,误差不超过5%。本研究能够为同类型对抛式双级弹射作动筒的设计提供理论指导。

隆起对砂岩型铀矿成矿的控制及找矿启示

沉积盆地古隆起对油气成藏起到明显控制作用,对砂岩型铀矿成矿的制约也不可忽视。砂岩型铀矿通常就位于盆地边缘构造斜坡带和盆地内部隆起附近。隆起对砂岩型铀矿成矿的控制具体体现在:控制地下水补-径-排体系、控制层间氧化作用、控制沉积相带发育、伴生断裂促进物质输运以及为成矿供给铀等。中国北方沉积盆地中新生代以来经历复杂的构造活动,盆地域内非均衡发展而多形成隆起,因此我国铀矿找矿尤其需要重视隆起对铀成矿的控制。其中,盆地内部找矿应重点关注被大幅抬升的隆起,而盆地边缘构造斜坡带上找矿需重视微隆起以及基底上覆地层的褶皱。将隆起作为关键控矿要素,优选适用的攻深找盲方法,精细刻画盆地基底隆升形成的背斜、褶皱及伴生断裂,可有效提高铀矿找矿效率并拓展铀矿找矿空间。

室内空间中人造板的隔声性能及规律研究

人造板作为室内装饰、装修的重要材料之一,会对室内空间的声学环境产生重要影响,研究人造板在室内空间中的隔声性能具有重要意义。基于此,本研究分别对人造板单板结构、箱框结构和以石膏板为背板的箱框结构的隔声性能进行分析。结果表明,板材类型对隔声性能具有显著影响,在单板结构中胶合板相较其它板材具有良好的隔声性能;箱框结构能够显著提高单板结构的隔声性能,五种人造板制成的箱框结构的隔声量分别提升了30.77%(中纤板)、7.14%(胶合板)、29.17%(刨花板)、44.00%(指接板)和18.52%(细木工板);另外,采用胶结合连接的人造板-石膏板箱框结构能够保持良好的隔声性能。这能为人造板在室内空间的应用和室内环境优化提供科学依据。

公务机驾驶舱内饰布局设计感性评价

为提升公务机的航空安全和适航性能,营造合适的驾驶舱环境氛围,构建了公务机驾驶舱内饰布局设计的感性评价模型,提出了系统化的设计知识以指导公务机驾驶舱内饰布局的感性设计优化。首先,基于图像边缘检测技术提取设计特征,建立了公务机驾驶舱内饰布局设计案例库。其次,通过对感性语汇的搜集与聚类,构建了能诠释公务机驾驶舱内饰布局设计表象、抽象、意象信息的“实体层—秩序层—氛围层”感性意象空间。然后,融合“主观评价—眼动—面部表情”3个指标的数据,从“实体层—秩序层—氛围层”3个感性意象评价维度建立了公务机驾驶舱内饰布局设计的综合感性评价模型。最后,分别从整体层和细节层两个层次剖析了公务机驾驶舱内饰布局设计特征与感性评价之间的映射关系,并形成系统的设计优化知识。为公务机驾驶舱内饰布局设计感性评价提供了新的实验范式及数据分析体系,为其内饰布局设计提供了方法指导。