Optimised Calibration Method for Six-Port Junction

A dual-tone technique is used to produce multi-samples in optimising calibration of six-port junction. More accurate results are achieved by using the least-square method and excluding those samples which may cause bigger errors. A 0.80 -1.10 GHz microwave integrated circuit （MIC） six-port reflectometer is constructed. Nine test samples are used in the measurement. With Engen＇s calibration procedure, the difference between the HP8510 and the six-port reflectrometer is in the order of 0.20 dB/1.5° for most cases, above 0.50 dB/5.0° at boundary frequency. With the optimised method, the difference is less than 0. 10 dB/1.0° for most cases, and the biggest error is 0.42 dB/2.1° for boundary frequencies.

Application of the “Six-Step Teaching Method” in the Nursing Teaching of Obstetric Interns

Objective: The “six-step teaching method” is a teaching method, which is summarized based on practical experience. This study aimed to explore the effect of “six-step teaching method” in clinical teaching of obstetrics. Methods: A quasi-experimental study design was used, 30 nursing students who entered obstetrics practice from March 2022 to July 2022 were selected as the control group according to the order of time, and traditional teaching methods were adopted. From August to December 2022, 30 interns were selected as the experimental group, and the “six-step teaching method” was adopted. After 8 weeks of clinical practice, the assessment results and teaching effect satisfaction of the two groups were compared. Results: The scores of obstetrical specialty in the experimental group were higher than those in the control group, and the difference was statistically significant (P < 0.05);The evaluation of teaching methods, teaching quality, classroom atmosphere and individual observation ability, clinical thinking ability and nurse-patient communication ability of the experimental group were higher than those of the control group, and the differences were statistically significant (P Conclusion: “six-step teaching method” can effectively master the professional knowledge of obstetrics, stimulate the clinical thinking ability of interns, and improve the teaching effect and satisfaction. .

The mechanism and clinical effectiveness of the six-step Chinese Daoyin technique on hemiplegic patients with drop-foot

Objective: The aim of this study was to improve the Chinese Daoyin technique (physical and breathing exercises), which is an ancient rehabilitation method, to elevate its effect and to standardize its operational procedure. Methods: Based on the ancient Chinese Daoyin technique, a six-step method was developed including: 1) motion imagination and imitation;2) mental and breathing regulation;3) target point determination;4) motion percussion;5) motion persistence;6) relaxation. Sixty drop-foot patients who suffered from hemiparesis after a stroke were randomly divided into the experimental group and the control group. Functional evaluation including Fugl-Meyer assessment score, Lovett manual muscle test (MMT), active range of motion of the ankle joint and electromyography were performed before and after the training course. The data were analyzed using the statistical software SPSS 12.0. Results: The differences between the two groups were significant. The effectiveness of the six-step group was significantly better than the effectiveness of the control group. Conclusion: The six-step method of the Chinese Daoyin technique is an effective rehabilitation training method for drop-foot in stroke patients with hemiparesis.

企业安全生产失信的影响因素及组态研究

为深入探究企业安全生产失信的影响因素和组态作用路径,科学防控企业安全生产失信行为,采用扎根理论对企业安全生产失信案例编码并提炼影响因素,将影响因素作为模糊集定性比较分析的条件变量,采用六值法结合事故等级对结果变量进行信用分级,探究企业安全生产失信产生的组态路径。结果表明,企业安全生产失信产生的组态路径主要包括应急型、诚信意识-执行型、制度型、安全目标-个体型等,失信行为发生的核心条件为安全诚信意识、安全诚信制度、应急管理水平,并在此基础上就企业安全生产失信防控提出建议。

“六个坚持”:讲好思政课的必然要求和实践路径

如何讲好思政课是党和国家长期关注的问题。“六个坚持”是习近平新时代中国特色社会主义思想的立场观点方法,是讲好思政课的必然要求。其中,“人民至上”是讲好思政课应坚守的价值立场,要求教学必须以人民利益为出发点和归宿;“自信自立”是讲好思政课需体现的精神气质,要求让有信仰的人讲信仰,将理想信念教育融入教学;“守正创新”是讲好思政课要遵循的改革要求,需要坚持根本原则不动摇,同时善于顺势而变、开拓创新;“问题导向”是讲好思政课的重要方法,要求精准把握问题,引导学生分析和解决问题;“系统观念”是讲好思政课需具备的思维方式,要求运用普遍联系的、系统全面的、发展的观点开展教学;“胸怀天下”是讲好思政课需拥有的世界情怀,需培养学生关注全球问题和尊重多元文化。

Statistical Monitoring Method for Pesticides and Harmful Substances

A statistical monitoring method has been developedfor accurate, safety surveillance methods of γ-BHC resideueor harmful substances in foods or feeds. It is very importantfor safety monitoring and arbitrament inspections. This paperintroduces a calculation formula by a six-point calibrationmethod and an example for detection of Y-BHC in corn.The method can guarantee the accuracy of the results,and it does very substantially reduce the probability of an er-ror by one-point calibration.

6轴工业机器人在线误差补偿处理方法

随着现代制造业的发展,6轴工业工业机器人的应用越来越广泛,其对生产效率和质量的影响也日益显著。然而,由于制造过程中各种因素的影响,如机械磨损、环境温度变化等因素都会导致机器人工作精度下降。因此,如何有效地进行在线误差补偿成为了当前6轴工业工业机器人领域中的一个重要问题。将提出一些基于6轴工业机器人在线误差补偿处理方法,以提高6轴工业机器人的工作精度,并为实际应用提供参考。

“教学做合一”课程教学的探讨与实践——以《车身电控系统检修》课程为例

实行“教学做合一”的教学模式可以有效实施职教课程。但要如何实行教学做合一的教学模式,必须探讨教、学、做的教学设计与实施。文章讲述了“教学做合一”的教学方法、课程教学的设计与实施,理论模块与实践模块展开教学的方式。探讨了把职业素质,社会能力的培养融入课程教学中,旨在要真正让学生全员参与,全过程学习,达到人才培养的目标。

基于六西格玛方法的A集输站外输流程优化

随着油田行业在环保和双控问题上的关注,企业越来越重视优化生产流程和提高产品质量。本文针对A集输站原油外输过程中存在的调参操作时间长、蒸汽成本高等问题,基于六西格玛方法对工艺流程进行了优化改进。通过DMAIC五个阶段,成功将人工调参时间从10分钟缩短至10秒钟,同时将蒸汽用量从每天36吨降低至23吨。这些改进显著降低蒸汽成本,有效优化站内原油外输流程。因此,本研究对提高A集输站的生产效率和成本控制具有重要意义。

废旧锂离子电池搬运机器人末端执行器设计

为了解决废旧锂离子电池回收问题,针对回收过程中的分拣步骤,设计了一种可以承载电池质量并适应不同尺寸的机器人末端执行器。介绍了末端执行器各个机构,并针对肘杆六杆机构进行了进一步校核,建立了六杆机构的运动学模型;使用遗传-BFGS(Genetic Algorithm-BFGS,GABFGS)拟牛顿法和粒子群-BFGS(Particle Swarm Optimization-BFGS,PSO-BFGS)拟牛顿法对六杆机构的杆长及位置参数进行优化,建立了六杆机构的动力学模型,计算并仿真校核了空载所需的驱动力,以及极限条件下搬运过程的径向力。研究提供了一种六杆传动机构的新思路,可为废旧锂离子电池分拣设备的研发提供参考。

欠驱动型ROV改进设计与纵倾优化

针对无人遥控潜水器(remotely operated vehicle,ROV)在高速航行时因受流场作用而导致纵倾幅值、纵倾角度变化较大的问题,提出通过搭配选择扩展底盘和尾翼结构参数的方法来实现欠驱动型ROV的零纵倾或微纵倾高速运动。基于格子玻尔兹曼方法(lattice Boltzmann method,LBM),通过壁面自适应细化算法,结合ROV的结构参数进行六自由度仿真实验,以模拟ROV的航行运动。对扩展底盘和尾翼高度不同的ROV分别进行数值分析,得到扩展底盘、尾翼的结构参数与ROV纵倾幅值、纵倾角度的关系。通过对航行表现相似的ROV的旋转力矩进行比较,确定了在相同扩展底盘条件下ROV的稳定性与尾翼高度的关系。开展了扩展底盘和尾翼结构优化正交实验,利用遗传算法对不同实验方案下ROV的纵倾数据进行了拟合处理。结合实际需求确定了扩展底盘和尾翼的高度,并通过实际测试验证了ROV纵倾优化设计方案的正确性。结果表明,合理搭配扩展底盘和尾翼的结构可有效减小欠驱动型ROV的纵倾幅值,从而实现ROV在无幅值补偿时的微纵倾航行运动。研究结果可为相关水下装置纵倾运动的改进提供参考。

Kinematic Solution of Spherical Stephenson-Ⅲ Six-bar Mechanism

A closed-form solution can be obtained for kinematic analysis of spatial mechanisms by using analytical method.However,extra solutions would occur when solving the constraint equations of mechanism kinematics unless the constraint equations are established with a proper method and the solving approach is appropriate.In order to obtain a kinematic solution of the spherical Stephenson-III six-bar mechanism,spherical analytical theory is employed to construct the constraint equations.Firstly,the mechanism is divided into a four-bar loop and a two-bar unit.On the basis of the decomposition,vectors of the mechanism nodes are derived according to spherical analytical theory and the principle of coordinate transformation.Secondly,the structural constraint equations are constructed by applying cosine formula of spherical triangles to the top platform of the mechanism.Thirdly,the constraint equations are solved by using Bezout’ s elimination method for forward analysis and Sylvester’ s resultant elimination method for inverse kinematics respectively.By the aid of computer symbolic systems,Mathematica and Maple,symbolic closed-form solution of forward and inverse displacement analysis of spherical Stephenson-III six-bar mechanism are obtained.Finally,numerical examples of forward and inverse analysis are presented to illustrate the proposed approach.The results indicate that the constraint equations established with the proposed method are much simpler than those reported by previous literature,and can be readily eliminated and solved.

基于六步法的显微镜下精索静脉结扎术的疗效

目的 分析基于六步法的显微镜下精索静脉结扎术的临床效果。方法 回顾性分析山东大学齐鲁医院闵傲外科收治的102例精索静脉曲张患者在2021年9月—2022年12月进行显微镜下精索静脉结扎术的疗效,对照组(2021年9月—2022年6月,共47例)患者行常规显微镜下精索静脉结扎术,试验组(2022年7月—2022年12月,共55例)采用基于六步法的行显微镜下精索静脉结扎术,对比两组患者手术指标和并发症发生情况。结果 试验组手术时间较对照组明显缩短(32.54±1.68)vs.(47.76±1.43)min,组间差异有统计学意义(P <0.001),术前指标、术中其他指标(精索内静脉复合体数量、手术时间、出血量)、术后指标两组间比较,差异均无统计学意义(均P> 0.05)。结论 基于六步法的显微镜下精索静脉结扎术,通过建立正确的手术层面,规范了手术步骤和流程,从而减少了手术时间,同时有效结扎静脉、保留动脉及淋巴管,术后并发症少,临床疗效良好。

Solution to Equivalent Power Element of a Six Degrees of Freedom Simulator

The dynamical equation of a six degrees of freedom(DOF) Stewart-type simulator with load and impact force is derived. By associating the direct solution to acceleration with the inverse solution to force, an equivalent power element model of the simulator is further presented, which offers the basis for analysis and design of the control system of the simulator.

高洁净度超光滑非球面的自动化干涉检测方法

为了实现应用于高能激光等领域对表面洁净度有着极高要求的超光滑非球面检测,排除检测人员带来的洁净度与空气扰动的影响,研究了高洁净度超光滑非球面的自动化干涉检测方法。通过建立补偿干涉法非球面失调量与波前像差之间的灵敏度矩阵,实现利用波前像差求解被测非球面失调量。以理想干涉系统的离焦、彗差与像散为优化目标,进行反馈控制,实现被测非球面的自动化调整,进而实现高洁净度超光滑非球面的自动化干涉检测。实验结果表明,在干涉图可测范围内,利用灵敏度矩阵通过几步迭代即可实现非球面失调量的收敛。结合Stewart六自由度调整台,分别实现2μm精度的平移误差调整、2"精度的光轴自动化对准,最终完成被测非球面的精密调整,实现高洁净度超光滑非球面的自动化干涉检测。采用灵敏度矩阵与六自由度调整的非球面自动化干涉检测方法可实现被测非球面失调量的快速求解与自动调整,降低人员和环境带来的扰动影响,提高了非球面的检测速度,并实现了高洁净度超光滑非球面的自动化干涉检测。

六西格玛在船舶领域的应用研究

随着我国船舶工业的迅速发展,很多大型造船企业在研发建造环节均应用了创新方法,其中六西格玛是比较常用的一种。通过对六西格玛方法的概述与分析,综述了其在船舶领域的典型应用,指出了目前船舶应用中存在的单一创新方法使用程度低、多创新方法集成应用少等主要问题。针对船舶建造领域存在的问题,提出了基于六西格玛等创新方法在船舶领域的创新集成框架,并对创新方法在船舶领域的持续深入应用进行了展望。

子母无人机多体分离气动特性模拟

子母机多体分离过程中气动干扰特性的分析是集群无人机发射技术的重要研究方向。基于动态嵌套非结构多面体网格技术,耦合求解流场非定常N-S方程与刚体六自由度运动方程,实现了子母机多体分离过程的精确模拟。首先,对母机的气动干扰区和子母机的分离方式进行分析,其次,计算得到整体状态时子母机以及子机与子机之间的气动干扰特性,最后,根据多体分离过程中子机运动状态的变化情况,进行安全特性评估。研究结果表明:相对于减速分离,加速分离能够快速脱离气动干扰区,安全性更高,并且随着子机数量的增加,子机机翼的距离不断减小,在一定程度上减弱了子机的翼尖涡对翼面的影响,增大了子机的升力。

基于D-H参数的六轴机器人运动学分析与仿真

将六轴协作机器人作为研究目标,对其进行了运动学分析,并通过D-H参数法实现了机器人的运动学研究与模拟,同时利用机器人的尺寸图与结构图建立连杆坐标系并形成了相关的参数表,在相同关节角度上分别通过正、逆运动理论与MATLAB模型中的方法实现了机器人末端的姿态计算与模型的正确性检验。通过蒙特卡洛算法可以计算出机器人的空间点云图,通过MATLAB工具包可以计算出机器人末端节点的位置、速度和加速度的拟合曲线。

基于布鲁姆掌握教学理论的六步教学法在医学文献检索教学中的应用

目的探讨基于布鲁姆掌握教学理论的六步教学法在医学文献检索教学中的应用效果。方法2023年3月—2023年6月,以82例学生为授课对象,随机分为对照组和观察组,每组学生各41例。对照组给予常规教学。观察组采取基于布鲁姆掌握教学理论的六步教学法进行授课,具体授课环节包括知识概念讲解、学生领会吸收、检索实践操作、自我分析和小组分析、知识综合梳理和自我评价等。教学后,从理论及数据库基础知识掌握情况、检索实践技能比较和学生医学文献检索课的学习体会等方面,比较教学效果。结果两组学生相关理论知识掌握、数据库基本情况、数据库特色特点等方面,以及数据库及子数据库选择、检索字段选择方面评分比较,差异无统计学意义。观察组学生检索词分析和高质量文献检索结果优化评分高于对照组,在学生医学文献检索课的学习体会方面高于对照组,差异有统计学意义(P<0.05)。结论基于布鲁姆掌握教学理论的六步教学法,有效提高了医学文献检索课的教学效果。

六元氮杂芳环构建方法及含能材料合成研究

综述了吡啶,哒嗪、嘧啶、吡嗪环、三嗪以及四嗪等六元氮杂芳环骨架构建方法,探讨了相应的六元氮杂芳环环化反应机理,概述了典型含能材料的物化与爆轰性能;重点从合成角度总结了缩合反应与环加成反应在构建六元氮杂芳环结构中的应用,讨论了在相应氮原子中心位点实现氮氧化或氮氨化反应的方式。其中,六元氮杂芳环氮氧化片段的引入主要包括两类途径:一是以氧化剂与氮杂芳环中氮原子中心发生反应,形成N-氧化物片段;另一类是利用环化反应,将相应的氮氧双键等结构转化为N-氧化物片段。附参考文献91篇。