基于交互式决策的旋转基多目标可视化技术

为解决高维多目标优化问题中Pareto最优解集不能有效可视化这一难题,提出一种基于交互式决策的旋转基多目标可视化技术.首先利用基向量的旋转角度反映Pareto最优解中各目标的优劣程度;然后以绘制基点为初始位置,依次叠加旋转后的基向量;最终将Pareto最优解以一条独立路径映射为二维空间平面上的一条折线,得到旋转基可视化图形.基于此思想设计了高维多目标可视化模型并进行实验,结果表明,该技术有效地反映了Pareto最优解中各目标的性能、波动性以及综合性能优劣等属性情况,达到了方便决策者对Pareto最优解集进行分析和决策的目的.

基于旋转基技术的多目标粒子群优化算法

为了解决多目标优化求解的问题,提出一种基于旋转基技术的多目标粒子群优化算法(rt MOPSO)。改进了旋转基可视化技术,并将Pareto前沿映射到改进的旋转基扇形平面上,采用差熵指标监测种群进化状态。为平衡归档集的收敛性和多样性,提出了角度支配和角度支配力度两种新的概念,并设计归档集新的排序方法。在融合了旋转基角度和距离的概念的基础上,提出了一种改进的全局引导粒子的选择策略。改进算法采用两个类别的测试函数,与五种多目标优化算法进行了对比实验。实验结果表明,改进算法在收敛性和多样性方面优势明显。

基于旋转基的复杂配电网故障区段定位方法

配电网网络错综复杂,且常常拥有多个电源,配电网故障区段定位方法在快速确定故障区段和恢复非故障区段的正常供电中起到重要作用。提出一种基于旋转基的复杂配电网故障区段定位方法,利用旋转基将复杂配电网划分为包含电源的主干网络和不包含电源的旁路网络两部分。划分后采用分层控制,旁路网络采用辐射型网络故障定位方法快速找到故障区段,主干网络采用旋转基定位法确定故障区段。研究结果表明,该方法可以快速、便捷、准确地找到配电网故障区段。

旋转基板的激光测温

激光测温是一种先进的温度测量方法。它具有测量准确、反应速度快、非接触等特点 ,尤其适用于测量真空镀膜中基板的温度。但目前的测温对象只能是固定的基板 ,因而还不完全实用。我们新发展了一种自动测温系统 ,可以对旋转基板的干涉条纹移动进行计数 ,从而实现了旋转基板的测温 ,使激光测温技术更具实用性。介绍了该系统的原理。

基圆旋转法铣削渐开线型腔

对涡旋式压缩机关键零件涡旋盘的渐开线型腔加工提出了基圆旋转法 ,并对其加工精度从编程方法和机床运动方面进行了分析 ,说明基圆旋转法是能保证加工精度的方法之一。

采用基圆旋转法加工渐开线螺旋面

对渐开线螺旋面采用基圆旋转法加工,并对其加工精度从编程方法和机床运动方面分析,说明基圆旋转法是保证加工精度的重要方法之一。

股骨颈基底部旋转截骨术治疗早期股骨头坏死患者的临床疗效

目的探讨在早期股骨头坏死患者的临床治疗中应用股骨颈基底部旋转截骨术的疗效。方法选取2016年1月至2018年9月在医院接受诊治的60例早期股骨头坏死患者作为研究对象,依据随机数字表法将其分为对照组和试验组,每组30例。对照组给予死骨清理打压植骨术进行治疗,试验组给予股骨颈基底部旋转截骨术进行治疗,观察并比较两组临床治疗效果。结果术前,两组Harris髋关节评分比较,差异无统计学意义(P>0.05);术后,试验组Harris髋关节评分优于对照组,差异有统计学意义(P<0.05);试验组功能恢复优良率高于对照组,差异有统计学意义(P<0.05)。结论股骨颈基底部旋转截骨术治疗早期股骨头坏死患者的临床疗效显著,优于死骨清理打压植骨术。

三种不同颅面型青少年下颌骨生长旋转的纵向比较研究

目的 :纵向比较不同颅面型青少年下颌骨生长旋转。方法 :根据Bjork前颅基底稳定结构和下颌骨稳定结构重叠法 ,头影测量 6 0名青少年在 6、9、1 2、1 5和 1 8周岁拍摄的X线头颅定位侧位片 ,统计分析三种颅面型RE Fcrb/REFml角 ,REFcrb/ML角和REFml/ML角的关系。结果 :①三种颅面型青少年生长发育期间 ,下颌骨整体旋转及基质旋转呈向前旋转 ,基质内旋转呈向后旋转。②低角型的下颌骨整体旋转和基质旋转向前旋转幅度大于正常型 ,高角型的向前旋转幅度最小 ,各种颅面型下颌骨基质内旋转幅度没有明显区别。③下颌骨生长旋转 ,男女之间无显著差异。结论

月球资源低成本规模化批量运返技术方案设想

月球资源开发与利用是新时代世界航天大国月球探测的核心内容和焦点。本文介绍了月球资源开发工程的技术难点,提出了一种月球资源开发低成本规模化批量运返技术方案,其核心为全新设计的月基磁悬浮旋转抛射返回系统。该方案具有原创性强、易实现、高效益等技术优势和特点,能够大幅提升月球资源开发运返效率,降低运返成本,对实现月球资源规模化批量运返,促进其商业化开发具有重要的现实意义。同时本文还提出了月球资源开发应用系统大科学装置的构想,以服务于将来的月球探测科学研究以及月球资源开发与利用。

虚拟现实技术辅助下经股骨颈基底部旋转截骨术治疗股骨头坏死11例

目的:探讨虚拟现实技术(Virtual Reality,VR)辅助下经股骨颈基底部旋转截骨术治疗股骨头坏死(Osteonecrosis of the Femoral Head,ONFH)的临床效果。方法:以2018年4月至2019年11月拟行经股骨颈基底部旋转截骨术的11例(11髋)ONFH患者作为研究对象,分期均为国际骨循环学会(Association Research Circulation Osseous,ARCO)Ⅲ期。术前采用VR技术进行方案设计,将CT数据导入软件构建坏死区域形态,模拟旋转截骨,根据负重区股骨头完整率设计旋转角度。术中按照术前规划进行旋转截骨,C臂机下透视确认旋转角度和负重区情况。如出现计划旋转角度偏小情况,则在透视下继续增加旋转角度。术后第2天通过摄X线片评估旋转效果,与术前规划旋转角度比较。随访时采用Harris评分评估髋关节功能。结果:术后切口均Ⅰ期愈合。患者均获随访,随访时间10~26个月。术后均达到VR术前规划旋转角度。10例(10髋)截骨处愈合良好,1例(1髋)出现截骨处延迟愈合。术前Harris评分为(55.00±4.73)分,末次随访时Harris评分为(72.73±10.93)分,与术前比较差异有统计学意义(t=4.937,P<0.001)。末次随访时髋关节评分优1髋,较好2髋,良5髋,差3髋,优良率为72.7%。结论:虚拟现实技术辅助下经股骨颈基底部旋转截骨术治疗股骨头坏死短期疗效满意。

接收端基矢旋转对星舰量子密钥分发的影响

在星舰量子密钥分发系统中,发送量子密钥的量子卫星是低轨道卫星,追踪量子卫星的接收设备安装在船舰上。接收设备需要追踪卫星的运动,接收端基矢不可避免地会发生旋转。分析了导致基矢旋转的原因,针对BB84协议,建立了基矢旋转角与量子误码率、获取信息量的定量关系。结果表明,当传输距离为200 km,基矢旋转角分别为2°和10°时,量子误码率和获取的信息量分别为8.255×10^(−5)和0.99、2.044×10^(−3)和0.91。基矢旋转角大于2°时,星舰量子密钥分发系统的性能有明显下降,这表明进行星舰量子密钥分发时,需根据基矢旋转角的大小提前进行自适应校正。

Influences of spin on the properties of a weak-coupled magnetopolaron in quantum dot

Considering the influences of the spin on the ground state energy,the properties of a weak-coupled magnetopolaron in quantum dots are studied by using a linear combination operator and unitary transformation method.The numerical calcu-lation results for CaP crystals have been given as examples.

Preparation of p-Hydroxybenzaldehyde by Hydrolysis of Diazonium Salts Using Rotating Packed Bed

A new type of reactor,featured with impinging stream-rotating packed bed（IS-RPB）and coil pipes,was designed and used to prepare p-hydroxybenzaldehyde（PHB）by hydrolysis from diazonium salts.The influence of operating parameters,such as reaction temperature,reaction time and high gravity factor,on the yield of PHB was investigated.Compared with the traditional kettle-type reactor,the yield of PHB with the new reactor is increased significantly and the reaction time is much shorter.Under the optimum conditions,the yield of PHB is increased from 51%to 84.1%.The reactor offers an opportunity for replacing the traditional batch mode operation with a continuous process.

Ground-State Bands of Fm and No Isotopes in Cluster Model

We investigate the ground-state rotational bands of nuclei with Z 〉 100 using cluster model proposed by Buck et al. [Phys. Rev. Left. 94 （2005） 202501]. The core-duster decomposition of each nucleus is determined by the corresponding electric quadrupole transition strength B（E2 ： 2^＋ → 0^＋）. The theoretical spectra of fermium and nobelium isotopes are compared with available experimental data. Good agreement between model and data is obtained.

A novel system for Agrobacterium-mediated transformation of wheat(Triticum aestivum L.) cells

A new approach for transforming the cultured cells of wheat(Triticum aestivum L. cv. Ganmai 8) was developed using Agrobacterium tumefaciens. The features of the optimum procedure were: (a) both combined synthetic signal molecules and multiple natural extracts from susceptible plants were used to pretreat the primary vigorous Agrobacterium(PVA) cells for approximately 16 h; (b) the gyratory magnetic field condition was used during cocultivation; (c) the cocultivating period and selecting condition were modified; (d) the recipient cells were at exuberant metabolism and active division while infected with Agrobacterium. Both neomycin phosphotransferase and nopaline synthase assays demonstrated the expression of NPT II and NOS genes, located on the T-DNA segment of chimaeric plasmid pGV3850::1103neo, in transformed wheat cell colonies by adopting the techniques of dot blot, ndPAGE or high voltage paper electrophoresis. Integration of the foreign genes into wheat genome was confirmed by Southern blot hybridization. Moreover, a relatively rational method was described for the estimation of transformation frequencies from cultured cell levels.

Effect of substrate rotation speed on structure and properties of Al-doped ZnO thin films prepared by rf-sputtering

Al-doped ZnO(AZO)thin films were deposited on glass substrates by rf-sputtering at room temperature.The effects of substrate rotation speed(ωS)on the morphological,structural,optical and electrical properties were investigated.SEM transversal images show that the substrate rotation produces dense columnar structures which were found to be better defined under substrate rotation.AFM images show that the surface particles of the samples formed under substrate rotation are smaller and denser than those of a stationary one,leading to smaller grain sizes.XRD results show that all films have hexagonal wurtzite structure and preferred c-axis orientation with a tensile stress along the c-axis.The average optical transmittance was above90%in UV-Vis region.The lowest resistivity value(8.5×10?3Ω·cm)was achieved atωS=0r/min,with a carrier concentration of1.8×1020cm?3,and a Hall mobility of4.19cm2/(V·s).For all other samples,the substrate rotation induced changes in the carrier concentration and Hall mobility which resulted in the increasing of electrical resistivity.These results indicate that the morphology,structure,optical and electrical properties of the AZO thin films are strongly affected by the substrate rotation speed.

Counter-Rotating Type Tidal Stream Power Unit Mounted on a Mono-pile

The authors have invented a unique counter-rotating type tidal stream power unit, which is composed of tandem propellers and a double rotational armature type generator without a stator. The front and the rear propellers drive, as for an upstream type, the inner and the outer rotational armatures in the counter-rotating directions respectively, which keep the rotational torques counter-balanced between both propellers and armatures. This paper investigates experimentally the output and forces acting on a pile in a water channel, to get design materials of the mono-pile type tidal stream power unit. The output is maximal at the moderate rotational speed, as the same as a wind turbine. The force acting on the pile is affected by the drag, the Karman vortex and the dynamic balances of the tandem propellers, and has dominant frequencies due to not only the individual but also the interacting rotation of the front and the rear propellers.

Continuous rotation north-finding algorithm based on constrained adaptive Kalman filter

As an orientation measurement system,north-finder has been playing a significant role in both military and civilian fields of orientation and control.In this paper,to deal with drawbacks in the conventional north-finding systems,a dynamic strategy based on continuous rotation modulation to measure the rotational angular velocity of the earth is proposed.By modeling the dynamic error,optimizing the process constraint and estimating dynamic noise,a method combining delay compensation and hardware adjustment,and a constrained adaptive Kalman filter(CAKF)algorithm are designed for the north-finding strategy.According to simulation and experiments,the proposed algorithm can achieve the high-precision north-finding with robust and anti-noise performance.

TiO_2–SA–Arg nanoparticles stabilized Pickering emulsion for photocatalytic degradation of nitrobenzene in a rotating annular reactor

Pickering emulsions stabilized by salicylic acid and arginine modified titanium dioxide （TiO2-SA-Arg） nanopar- tides were prepared in this study for photocatalytic degradation of nitrobenzene in a rotating annular reactor, and the effects of various design parameters of the rotating annular reactor, initial nitrobenzene concentration, catalyst amount, and solution pH on the degradation rate of nitrobenzene were investigated. Meanwhile, the degradation mechanism of nitrobenzene was proposed. The results show that increasing the aeration rate, the rotational speed, and light intensity results in a higher photocatalytic degradation rate of nitrobenzene owing to the effective clearance of electrons and a high quantity of oxidative free radicals. The degradation of nitroben- zene in the rotating annular reactor follows the pseudo first-order kinetics, but it is not well described by the Langmuir-Hinshdwood equation. Aeration has a significant effect on the photocatalytic degradation pathway of nitrobenzene. Because nitrobenzene can undergo reduction reaction as electron acceptors and oxidative deg- radation initiated by hydroxyl free radicals, the photocatalytic degradation of nitrobenzene follows the reduction mechanism under no aeration, but the oxidation mechanism under aeration.

Generation of Atomic Greenberger-Horne-Zeilinger States Based on Faraday Rotation

Based on the input-output relation of the cavity and the Faraday Rotation mechanism, we propose a scheme for generating the n-atom Greenberger Horne-Zeilinger state. In the scheme, the n-atom trapped respectively in n spatially separate cavities would be entangled with the photons going through the atom-cavity system. The successful probabilities of our protocol approach unity in the ideal case. What is more, no requirement for separately addressing further lowers experimental difficulties.