Creation of "Regional Characteristic" in Planning and Design of Farmers' Residential Area at the South of Lower Reaches of the Yangtze River

After analysis of location feature of the south of lower reaches of Yangtze River and its construction of urban and rural integration,the paper pointed out harmonious combination between natural and artificial factors had been neglected in planning and design of farmers' residential area at the south of lower reaches of Yangtze River,"regional characteristic" losing,residential area in the form of "city community" and buildings in European style.In view of these problems,relevant planning and design thoughts and methods had been proposed as to how to create "regional characteristic" from the perspective of planning,architecture and landscape design.It discussed with emphasis the importance of construction base type and combination of environment with residential area construction;inspirations and design methods obtained from traditional architectures;and the content of landscape overall planning and specific design.It was hoped to enlighten designers to shoulder social and historical responsibility,make exploration unremittingly,and construct beautiful homelands for people.

Angular Position Controller and Its Design Model Verification for the Electro-Hydraulic Servo Control System

The angular position controller is system （EHSAS） to control the output of the rotary applied to electro-hydraulic servo actuator actuator. It works as a compensator based on the frequency response of the EHSAS. Its design model is verified on the state-space model of EHSAS by using simulation program SIMULINK. Real data used to test the system. Simulation results give a good agreement for the controller and also for the state-space model.

The Design and Implementation of High-rise Building Construction Based on GPS Positioning Technology

Baseline observation as well as height measurement is the important content of the quality control of high-rise building construction.In order to strengthen the quality of construction projects,meet the requirement of completion time,improve the accuracy and efficiency of locating observation and explore a scientific way of observation suitable for high-rise building construction,this paper studies the design and implementation of high-rise building construction based on GPS positioning technology.

Research on the Architectural Design Positioning of University Halls

University hall is an important carrier of information exchange and sharing in higher education campuses,and the correct architectural design positioning can improve the value of university halls.There are many different features in the design and use of university halls and urban theaters.This paper investigates the feasibility study report and indexes of university hall projects,analyzes the indexes,construction scale and functional positioning of university halls in the pre-design period,summarizes some design suggestions,and believes that the use efficiency of university halls should be improved through intensive and compound construction to meet the needs of the rapid development of Chinas Universitys and universities.

Positioning and design by computed tomography imaging in neuroendoscopic surgery of patients with chronic subdural hematoma

BACKGROUND Neuroendoscopy is a very useful technique to Chronic Subdural Hematoma(CSH).But how to achieve the goal of treatment more minimally invasive?AIM To develop a simple,fast and accurate preoperative planning method in our way for endoscopic surgery of patients with CSH.METHODS From June 2018 to May 2020,forty-two patients with CSH,admitted to our hospital,were performed endoscopic minimally invasive surgery;computed tomography(CT)imaging was employed to locate the intracerebral hematoma and select the appropriate endoscopic approach before the endoscopic surgery.The clinical data and treatment efficacy were analyzed.RESULTS According to the learning of CT scanning images,the surgeon can accurately design the best minimally invasive neuroendoscopic surgical approach and realize the precise positioning and design of the drilling site of the skull and the size of the bone window,so as to provide the most effective operation space with the smallest bone window.In this group,the average operation time was only about 1 h,and the clearance rate of hematoma was about 95%.CONCLUSION Patients with CSH can achieve good therapeutic effect by using our way to positioning and design to assist the operation of CSH according to CT scan and image,and our way is very useful and necessary.

Beam Position and Beam Hopping Design for LEO Satellite Communications

The numbers of beam positions(BPs)and time slots for beam hopping(BH)dominate the latency of LEO satellite communications.Aiming at minimizing the number of BPs subject to a predefined requirement on the radius of BP,a low-complexity user density-based BP design scheme is proposed,where the original problem is decomposed into two subproblems,with the first one to find the sparsest user and the second one to determine the corresponding best BP.In particular,for the second subproblem,a user selection and smallest BP radius algorithm is proposed,where the nearby users are sequentially selected until the constraint of the given BP radius is no longer satisfied.These two subproblems are iteratively solved until all the users are selected.To further reduce the BP radius,a duplicated user removal algorithm is proposed to decrease the number of the users covered by two or more BPs.Aiming at minimizing the number of time slots subject to the no co-channel interference(CCI)constraint and the traffic demand constraint,a low-complexity CCI-free BH design scheme is proposed,where the BPs having difficulty in satisfying the constraints are considered to be illuminated in priory.Simulation results verify the effectiveness of the proposed schemes.

大型封闭空间中UWB定位基站拓扑的通用设计方法

超宽带(ultra-wide band,UWB)技术是无人装备在巡检具有多障碍物的大型封闭空间时获取定位坐标的主要方法之一。目前主要依赖人工方式设计UWB定位基站拓扑的构型、位置和数量。这种方式存在设计效率低下,设计效果未知,性价比难以确定等问题。为此,本文提出了一套较为科学完善的定位基站拓扑评价体系,并提出了一种在大型封闭空间中自动设计定位基站拓扑的通用方法。该方法以仿真模拟为基础,通过遗传算法结合拓扑评价体系,自动生成贴合实际应用场景的最优拓扑方案,包括最优的基站布设数量以及布设位置信息。实验结果表明:1)经通用设计方法生成的拓扑相比使用基站数量最多的拓扑,综合性能提高了6.2%;相比使用基站数量最少的拓扑,综合性能提高了21.2%。2)经通用设计方法生成的拓扑相比人工设计的锯齿形拓扑,综合性能提高了11.4%,设计效率提高了92.9%。可见,针对具有多障碍物的大型封闭空间场景,本文的方法可以在较短的时间内设计出综合性能较优,性价比较高的定位基站拓扑,为无人装备在此类大型封闭空间中开展全自主定位和巡检奠定了基础。

多体位智能轮椅床椅转换装置的运动学仿真分析

介绍了多体位智能轮椅的坐、躺、立、蹲、行5种姿态的转换功能,对床椅转换装置进行简化处理,建立背板机构的运动学模型,利用MATLAB对模型进行计算,得到背板的角速度和角加速度时间的运动曲线。利用ADAMS对优化后的装置模型进行运动学分析,得到改进后床椅转换装置的运动曲线。结果表明:该装置具有较好的运动学性能,在床椅转换过程中背板的最大角加速度达到了16°/s^(2),小于人体所能承受的最大角加速度50°/s^(2)。改进后,床椅平稳转换的时间有所延长,转换过程耗时7.5 s,在0.7~6.9 s内,背板运动趋于加速度接近0的平稳运动,表明推杆速度设计合理。

被动式木窗双端铣削加工定位夹紧装置的设计与研究

为满足欧式木窗定制化尺寸变化的需求,设计一种尺寸自适应定位夹紧装置,应用有限元软件对木窗夹紧过程进行静力学分析,在满足木窗夹紧的要求下,使木窗弹性变形在合理范围。同时为了满足轻量化设计要求对压辊连接架进行拓扑优化设计,根据拓扑优化结果改进压辊连接架结构,对优化后的模型进行静力学分析验证,最终得到优化后的工件。结果表明,优化后压辊连接架重量明显下降,满足相关使用要求。

汽车救援用内置远程定位装置设计与开发

设计一种汽车救援用内置远程定位装置,经过调研、文献查阅、分析论证、校企合作设计开发,明确了本定位装置整体结构示意设计以及整体工作流程设计,辅以绘制对应示意图及流程图,深入说明本设计的结构原理及工作过程,最后仔细推敲设计方案的可靠性及先进性。开发设计方案预解决现有的远程定位装置拆卸繁琐,需要借助工具,影响维修速度的问题。课题设计方案希望能为中小型汽车制造装配企业借鉴采用。

基于光学定位的三维超声引导肌肉注射仪设计研究

目的解决光学定位技术在引入肌肉痉挛治疗的注射手术应用中,光学定位设备与现有医用超声仪器之间的不适配问题,旨在进一步提升理论定位精度稳定性,简化必需操作并降低实际应用难度。方法在现有超声仪及相关设备功能基础上,结合光学定位设备工作条件需求进行需求分析,重新构建产品元件功能流模型并映射为网络节点,并基于复杂网络节点重要度评价方法,确定目标产品设计重心点并分层设计,最后采用仿真验证测试设计合理性。结果实验结果符合预期假设,目标节点所对应功能元件与其它节点的相关性程度与目标元件所需兼容连接的复杂度呈正相关。基于实验得出能够适配光学定位仪与超声设备的设计方案,有效解决二维超声导航引导肌肉注射所面临的不直观、不可视等问题。结论基于复杂网络节点的重要度评价方法更适用于复杂功能产品的设计研究,评价结果重要度差异更为显著。

两相式混合步进电机速度和位移控制案例设计

步进电机在电脉冲信号的控制下能实现一定的角位移或线位移,掌握步进电机的控制技术非常重要。以两相混合式步进电机为控制对象,以单片机AT89C52和可编程计数器/定时器8253为主对电机进行速度和位移控制设计,对某一具体案例采用Proteus软件进行设计与仿真,包括控制电路和程序的设计。仿真和实验结果表明:该系统结构简单、容易实现、成本低,可用于其他步进电机的控制,并为教学或工程应用提供了参考。

Catalytic Hydrothermal Liquefaction of Water Hyacinth Using Fe3O4/NiO Nanocomposite: Optimization of Reaction Conditions by Response Surface Methodology

This research aimed at optimizing the reaction conditions for the catalytic hydrothermal liquefaction (HTL) of water hyacinth using iron oxide/nickel oxide nanocomposite as catalysts. The iron oxide/nickel oxide nanocomposite was synthesized by the co-precipitation method and used in the hydrothermal liquefaction of water hyacinth. The composition and structural morphology of the synthesized catalysts were determined using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and atomic absorption spectroscopy (AAS). The particle size distribution of the catalyst nanoparticles was determined by the Image J software. Three reaction parameters were optimized using the response surface methodology (RSM). These were: temperature, residence time, and catalyst dosage. A maximum bio-oil yield of 59.4 wt% was obtained using iron oxide/nickel oxide nanocomposite compared to 50.7 wt% obtained in absence of the catalyst. The maximum bio-oil yield was obtained at a temperature of 320°C, 1.5 g of catalyst dosage, and 60 min of residence time. The composition of bio-oil was analyzed using gas chromatography-mass spectroscopy (GC-MS) and elemental analysis. The GC-MS results showed an increase of hydrocarbons from 58.3% for uncatalyzed hydrothermal liquefaction to 88.66% using iron oxide/nickel oxide nanocomposite. Elemental analysis results revealed an increase in the hydrogen and carbon content and a reduction in the Nitrogen, Oxygen, and Sulphur content of the bio-oil during catalytic HTL compared to HTL in absence of catalyst nanoparticles. The high heating value increased from 33.5 MJ/Kg for uncatalyzed hydrothermal liquefaction to 38.6 MJ/Kg during the catalytic HTL. The catalyst nanoparticles were recovered from the solid residue by sonication and magnetic separation and recycled. The recycled catalyst nanoparticles were still efficient as hydrothermal liquefaction (HTL) catalysts and were recycled four times. The application of iron oxide/ nickel oxide nanocomposites in the HTL of water hyacinth increases the yield of bio-oil and improves its quality by reducing hetero atoms thus increasing its energy performance as fuel. Iron oxide/nickel oxide nanocomposites used in this study are widely available and can be easily recovered magnetically and recycled. This will potentially lead to an economical, environmentally friendly, and sustainable way of converting biomass into biofuel.

卫星导航定位课程基于证据启发的学习设计

核心素养是学生应具备的能适应社会和终身发展需要的关键能力和必备品格,实践创新是6大核心素养之一。随着“互联网+教育”的迅速发展,结合网络教育对卫星导航定位专业课程进行基于证据启发的学习设计,有益于培养学生的实践创新素养。以提高工程实践能力为目标,通过线上线下混合式教学下翻转课堂的讨论式、启发式教学方法对该课程的专业知识进行关联、融合、贯通,进一步应用于解决工程实践问题。经过3轮以上的教学实践,通过对比传统式、混合式等不同教授—学习设计发现,混合式教学下基于证据启发的工程案例学习设计有助于培养学生解决复杂工程问题的能力以及工程实践创新能力。

品牌地位定位与复仇叙事设计的匹配效应对品牌态度的影响

探索品牌叙事中品牌地位定位策略如何与故事情节设计共同发挥作用,并影响消费者的品牌态度。以复仇题材的品牌故事为情境,研究了品牌地位定位(强势者vs.弱势者)与复仇叙事情节的交互如何影响消费者的品牌态度。通过一个定性研究和两个实验研究,考察了两种复仇叙事情节设计要素,即品牌在复仇故事中扮演的角色(复仇工具vs.复仇目的)和复仇焦点(为自我复仇vs.为他人复仇),与品牌地位定位策略的匹配关系。研究发现:当品牌采用强势者定位讲述品牌作为复仇工具以及为自我复仇的复仇故事时,消费者的品牌态度会更好;当品牌采用弱势者定位讲述品牌作为复仇目的以及为他人复仇的复仇故事时,消费者的品牌态度会更好;复仇满足感和复仇公平感分别在其中起到中介作用。发现了采用不同地位定位策略的品牌如何设计复仇故事才能带来更积极的消费者品牌态度,具有很强的现实意义。同时,本文解释了个体对不同品牌地位定位策略和故事情节设计做出反应的心理机制,促进了品牌地位定位策略与品牌叙事研究领域的研究。

基于响应面模型和BP-神经网络模型的机器人定位误差及验证分析

机器人定位精度是衡量工业机器人工作质量的一项重要指标,对零件加工质量有着重要影响。为满足现代工业的制造精度要求,机器人重复定位精度需要进一步提升,因此,通过响应面模型与BP-神经网络模型对机器人定位精度误差进行拟合,对比研究提升机器人重复定位精度的方法。首先建立响应面模型,采用中心复合设计方法,对机器人定位精度误差进行实验仿真,接着用BP-神经网络对机器人定位精度误差进行拟合。经过比对得知,BP-神经网络的拟合精度高于响应面模型,但响应面模型拟合效率高于BP-神经网络。最后借助激光跟踪仪对机器人进行误差补偿验证实验,结果表明,误差模型预测得到的误差值是合理的,验证了仿真的正确性及补偿的可行性。

悬挂式单轨交通车辆基地站场设计关键技术研究

[目的]悬挂式单轨交通车辆基地的总平面布局形式直接影响列车作业及工程造价。道岔选型对车辆基地站场总平面布局影响较大,运用库单线列位数的选择也将直接影响道岔数量及段场规模,因此需对悬挂式单轨交通车辆基地站场设计的关键技术进行深入研究。[方法]依托武汉光谷生态大走廊悬挂式单轨交通工程的龙泉山车辆段,阐述了该车辆段的总平面布局形式及创新点,分析了该车辆段道岔选型及场坪标高的制定方法,建立了理想条件下车辆段运用库单线列位数模型。[结果及结论]悬挂式单轨交通车辆基地总平面布置宜采用贯通式洗车方案,将洗车库放在出入线上;咽喉设计时,需同时考虑桥墩布置的美观性;需联合道岔厂家加快对三开道岔及五开道岔的研发,并合理选用不同道岔组合以更进一步节省投资;在不考虑其他作业干扰的理想条件下,悬挂式单轨交通车辆基地运用库最多可采用1线5列位,实际设计过程中需结合车辆基地条件、综合考虑列车出库的便捷性、扣除其他作业干扰等因素选择合适的运用库单线列位数。

Holographic alloy positioning design system and holographic network phase diagrams of Au-Cu system

Taking Au?Cu system as an example, three discoveries and two methods were presented. First, a new way for boosting sustainable progress of systematic metal materials science (SMMS) and alloy gene engineering (AGE) is to establish holographic alloy positioning design (HAPD) system, of which the base consists of measurement and calculation center, SMMS center, AGE center, HAPD information center and HAPD cybernation center; Second, the resonance activating-sychro alternating mechanism of atom movement may be divided into the located and oriented diffuse modes; Third, the equilibrium and subequilibrium holographic network phase diagrams are blueprints and operable platform for researchers to discover, design, manufacture and deploy advanced alloys, which are obtained respectively by the equilibrium lever numerical method and cross point numerical method of isothermal Gibbs energy curves. As clicking each network point, the holographic information of three structure levels for the designed alloy may be readily obtained: the phase constitution and fraction, phase arranging structure and properties of organization; the composition, alloy gene arranging structure and properties of each phase and the electronic structures and properties of alloy genes. It will create a new era for network designing advanced alloys.

基于机器视觉的菠萝自动去眼方法与试验

菠萝加工过程中的去眼作业目前主要依赖人工手动操作,劳动成本高且作业效率低。为实现自动化菠萝去眼作业,该研究运用YOLOv5目标检测算法对菠萝眼进行快速识别,将所有角度相差90o的两张图片作为一组进行立体匹配分析以获取菠萝眼的三维位置信息。通过旋转菠萝和轴向移动去眼刀具将专用去眼刀具依次对准每一个菠萝眼并快速去除。试验结果表明:YOLOv5目标检测算法对菠萝眼识别效果良好,验证集的准确率、召回率和平均精度均值均高于96%;菠萝眼实际中心与探针刺入位置的平均误差为1.01 mm,最大误差为2.17 mm,均方根误差为1.09 mm;菠萝眼的完全去除率为89.5%、不完全去除率为6.2%,漏检率为4.3%,单个菠萝去眼时间为110.9 s,基本满足自动化去眼作业需要。研究结果可为菠萝自动去眼机研发提供技术参考。

基于无意识设计的地铁腰靠布局研究

目的无意识设计能引起用户对新事物的亲切感,从而实现用户与设计之间的有效交流。本研究旨在观察地铁乘客的无意识站位选择行为,对车厢内腰靠布局进行研究,在有效利用地铁内部空间的同时,缓解地铁站立乘客的腰部压力。方法首先,归纳了“无意识”“无意识设计”的概念;其次,通过问卷调查与用户访谈的方式获取乘客的显性需求以证实腰靠研究的必要性;再次,通过观察乘客的无意识站位选择行为并进行成因分析,获取乘客的隐性需求,并从人机工程学的角度验证腰靠布局的可行性与合理性;最后,总结得出地铁腰靠布局的设计原则,进行设计实践。结论基于无意识理念的地铁腰靠布局设计,能够更好地服务于乘客,不仅能改善站立乘客的乘车感受,也为今后地铁腰靠设计应用带来指导意义。