Combined distal tibial rotational osteotomy and proximal growth plate modulation for treatment of infantile Blount's disease

Infantile Blount's disease is a condition that causes genu varum and internal tibial torsion. Treatment options include observation, orthotics, corrective osteotomy, elevation of the medial tibial plateau, resection of a physeal bar, lateral hemi-epiphysiodesis, and guided growth of the proximal tibial physis. Each of these treatment options has its disadvantages. Treating the coronal deformity alone(genu varum) will result in persistence of the internal tibial torsion(the axial deformity). In this report, we describe the combination of lateral growth modulation and distal tibial external rotation osteotomy to correct all the elements of the disease. This has not been described before for treatment of Blount's disease. Both coronal and axial deformities were corrected in this patient. We propose this combination(rather than the lateral growth modulation alone) as the method of treatment for early stages of Blount's disease as it corrects both elements of the disease and in the same time avoids the complications of proximal tibial osteotomy.

A Novel Square-wave Pulse Rotation Modulation Strategy for Modular Multilevel Converters

悬浮直流电容电压的均衡问题是模块组合多电平变换器（modular multilevel converter,MMC）的关键问题之一。提出一种可实现MMC直流电容电压平衡的方波脉冲循环调制（square-wave pulse rotation modulation,SWPRM）策略,在保证合成的阶梯波输出波形不变的前提下,根据MMC的拓扑结构和工作原理,对传统方波脉冲列进行脉冲优化,并按照一定的次序和切换周期进行循环和判断反相调整,获得的循环方波脉冲列作为最终驱动脉冲用于实现对MMC的控制。实验结果表明,采用提出的方波脉冲循环调制策略无需任何电容电压控制措施,在较低开关频率下,实现了MMC各功率单元间有功能量的平均分配和直流电容电压的均衡。

Satellite Rotation Modulation Measurement System Based on Ultrasonic Motor

Rotation modulation technique is generally used to improve the performance of aviation and marine inertial navigation system.Considering of the performance requirements from current aerospace to MEMS micro-nano inertial device,this paper proposedrotary inertial device modulation technology application methods on the satellite.Firstly,taking the advantage ofultrasonic motor,like high resolution,fast response,electromagnetic compatibility,a lowmagnetic,high-precision and appropriate for use on satellite ultrasonic motor modulation turntable was developed.Then,through theoretical modeling and simulations,the rotation modulation technology was verified to improvethe precise of satellite attitude measurementeffectively,equivalent toimprove the accuracy of MEMS gyro over an order of magnitude.This work helpsachieve the application of rotation modulation technology in aerospace and acceleratethe promotion of the MEMS gyro in satellite attitude measurement.

ROTATION CONSTELLATION FOR DIFFERENTIAL UNITARY SPACE-TIME MODULATION

A new constellation which is the multiplication of the rotation matrix and the diagonal matrix ac- cording to the number of transmitters is proposed to increase the diversity product, the key property to the performance of the differential unitary space-time modulation. Analyses and the simulation results show that the proposed constellation performs better and 2dB or more coding gain can be achieved over the traditional cyclic constellation.

A tightly coupled rotational SINS/CNS integrated navigation method for aircraft

Strapdown inertial navigation system(SINS)/celestial navigation system(CNS)integrated navigation is widely used to achieve long-time and high-precision autonomous navigation for aircraft.In general,SINS/CNS integrated navigation can be divided into two integrated modes:loosely coupled integrated navigation and tightly coupled integrated navigation.Because the loosely coupled SINS/CNS integrated system is only available in the condition of at least three stars,the latter one is becoming a research hotspot.One major challenge of SINS/CNS integrated navigation is obtaining a high-precision horizon reference.To solve this problem,an innovative tightly coupled rotational SINS/CNS integrated navigation method is proposed.In this method,the rotational SINS error equation in the navigation frame is used as the state model,and the starlight vector and star altitude are used as measurements.Semi-physical simulations are conducted to test the performance of this integrated method.Results show that this tightly coupled rotational SINS/CNS method has the best navigation accuracy compared with SINS,rotational SINS,and traditional tightly coupled SINS/CNS integrated navigation method.

Modified Omega-K algorithm for processing helicopter-borne frequency modulated continuous waveform rotating synthetic aperture radar data

With appropriate geometry configuration, helicopter- borne rotating synthetic aperture radar （ROSAR） can break through the limitations of monostatic synthetic aperture radar （SAR） on forward-looking imaging. With this capability, ROSAR has extensive potential applications, such as self-navigation and self-landing. Moreover, it has many advantages if combined with the frequency modulated continuous wave （FMCW） technology. A novel geometric configuration and an imaging algorithm for helicopter-borne FMCW-ROSAR are proposed. Firstly, by per- forming the equivalent phase center principle, the separated trans- mitting and receiving antenna system is equalized to the case of system configuration with antenna for both transmitting and receiving signals. Based on this, the accurate two-dimensional spectrum is obtained and the Doppler frequency shift effect in- duced by the continuous motion of the platform during the long pulse duration is compensated. Next, the impacts of the velocity approximation error on the imaging algorithm are analyzed in de- tail, and the system parameters selection and resolution analysis are presented. The well-focused SAR image is then obtained by using the improved Omega-K algorithm incorporating the accurate compensation method for the velocity approximation error. FJnally, correctness of the analysis and effectiveness of the proposed al- gorithm are demonstrated through simulation results.

Modeling of the influences of multiple modulated electron cyclotron current drive on NTMs in rotating plasma

In this work, physical models of neoclassical tearing modes （NTMs） including bootstrap current and multiple modulated electron cyclotron current drive model are applied. Based on the specific physical problems during the suppression of NTMs by driven current, this work compares the efficiency of continuous and modulated driven currents, and simulates the physical processes of multiple modulated driven currents on suppressing rotating magnetic island. It is found that when island rotates along the poloidal direction, the suppression ability of continuous driven current can be massively reduced due to current deposition outside the island separatrix and reverse deposition direction at the X point, which can be avoided by current drive modulation. Multiple current drive has a better suppressing effect than single current drive. This work gives realistic numerical simulations by optimizing the model and parameters based on the experiments, which could provide references for successful suppression of NTMs in future advanced tokamak such as international thermonuclear experimental reactor.

ANALYSIS OF UN-COINCIDE COORDINATE ERROR IN SINGLE-AXIS ROTATING FIBER OPTIC STRAP-DOWN INERTIAL NAVIGATION SYSTEM

The un-coincide coordinate error in the single-axis rotating fiber optic strap-down inertial navigation system（SINS） is analyzed. Firstly, a rotating modulation technology is presented for SINS. The method provides the enhanced property of SINS when using the same-leveled inertial measurement units. Then, the rotating struc- ture modification is derived and augmented to resolve the un-modulated error-accumulated problem. As the insuf- ficient machine processing, the horizontal and the vertical errors on the machine surface are inevitable, and the in- volved coordinates are difficult to get the exact coincident. So, two major kinds of coordinate situation are stud- ied. The equivalent error models on gyro and acceleration outputs are built for each situation, and the impact is analyzed for compensation. The part of attitude and position error models caused by the built angle-rate error is established to calculate the un-eoincident impact. Considering these conditions of different gyro accuracy and mo- tion states simultaneously, numerical simulations are implemented. Results indicate that the SINS modulation ac- curacy is seriously affected by the combined factors on gyro accuracy and motion conditions.

基于单片机的智能晾衣架设计

智能晾衣架作为智能家居的一部分,以其自动化控制和智能化管理的特点,受到广大用户的关注。该文旨在设计和实现一种基于单片机的简易智能晾衣架控制系统,以单片机STC89C51为控制核心,利用电阻应变式传感器感应晾晒衣物的重量,并通过手动控制的方式来对晾衣架的高度进行控制调节,同时利用发光LCD屏来显示此时的工作状态。当然,晾衣架还可以根据户外光线的亮与暗来控制此时晾衣架的伸展与收缩,以提高晾衣架的效率和使用便捷性。

容积旋转调强放疗与三维适形放疗在食管癌患者中的应用效果比较

目的:比较容积旋转调强放疗与三维适形放疗在食管癌患者中的应用效果。方法:回顾性分析2017—2022年该院收治的80例食管癌患者的临床资料,按照放疗方法不同将其分为观察组和对照组各40例。两组均予以卡培他滨片同步化疗,在此基础上,对照组采用三维适形放疗,观察组采用容积旋转调强放疗。比较两组临床疗效、靶区剂量学参数[计划靶区(PTV)总剂量、适形度指数(CI)、均匀度指数(HI)]、危及器官剂量和不良反应发生率。结果:观察组客观缓解率(ORR)为65.00%(26/40),高于对照组的42.50%(17/40),差异有统计学意义(P<0.05);观察组PTV总剂量、HI低于对照组,CI高于对照组,差异均有统计学意义(P<0.05);观察组双肺平均剂量、心脏平均剂量、脊髓最大剂量均低于对照组,差异有统计学意义(P<0.05);观察组不良反应发生率为65.00%(26/40),低于对照组的95.00%(38/40),差异有统计学意义(P<0.05)。结论:容积旋转调强放疗应用于食管癌患者可提高ORR,改善靶区剂量学参数,减小危及器官剂量,降低不良反应发生率,效果优于三维适形放疗。

Randomized study on the safety and efficacy of dual-axis rotational versus standard coronary angiography in the Chinese population

Background Dual-axis rotational coronary angiography （DARCA） was developed as an innovative adaptation of rotational angiography （RA）, but it requires a longer coronary injection compared to standard coronary angiography （SA）. As the body of the average Chinese patient is smaller than that of most western patients, with the same contrast injection time, the risk of complications from the contrast agent is increased in this population. The purpose of this study was to assess the clinical safety and efficacy of DARCA in the diagnosis of coronary artery disease （CAD） in the Chinese population by directly comparing it to SA. Methods Two hundred Chinese patients were randomized to either the SA group （n=100） or DARCA group （n=100）. Contrast utilization, radiation exposure and procedure time were recorded for each modalities. Blood pressure （BP）, heart rate （HR） pre and post injection symptoms and any arrhythmias were recorded. Results Compared to the SA group, there was a 42% reduction in contrast utilization, 55% reduction in radiation exposure and a 31% shorter procedure time in the DARCA group. In both groups, there were slight declines in the systolic BP values in the left coronary artery （LCA） post injection （P 〈0.01）. Moreover, post injection HRs for the LCA were also reduced in the DARCA group （P 〈0.01）. But all of these changes were small, transient and without clinical importance. Only one patient （1%） in the DARCA group had an attack of ventricular tachycardia immediately post injection and it resolved by itself during LCA angiography. No arrhythmias occurred in the SA group. Conclusion DARCA is a safe, efficient, and clinically comparable alternative to SA in the diagnosis of coronary artery disease in the Chinese population with less contrast utilized, which is less radiation exposure and a shorter procedure

Robust and high-speed rotation control in optical tweezers by using polarization synthesis based on heterodyne interference

The rotation control of particles in optical tweezers is often subject to the spin or orbit angular momentum induced optical torque,which is susceptible to the mechanical and morphological properties of individual particle.Here we report on a robust and high-speed rotation control in optical tweezers by using a novel linear polarization synthesis based on optical heterodyne interference between two circularly polarized lights with opposite handedness.The synthesized linear polarization can be rotated in a hopping-free scheme at arbitrary speed determined electronically by the heterodyne frequency between two laser fields.The experimental demonstration of a trapped vaterite particle in water shows that the precisely controlled rotation frequency of 300 Hz can be achieved.The proposed method will find promising applications in optically driven micro-gears,fluidic pumps and rotational micro-rheology.

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.

An all-optical buffer based on polarization rotation in an EAM

A theoretical model of the refractive index changes of the TE and TM modes in an electro-absorption modulator （EAM） is deduced. The photon absorption and refractive index changes are analyzed numerically. The influence of pump intensity on the phase difference between the TE and TM modes is studied. The polarization rotation effect is obtained in the EAM, and a novel all-optical fiber loop buffer is designed.

基于器件信息融合的双旋转惯导系统误差调制策略

目前,大型水面和水下载体一般安装两套旋转惯导系统(RINS),两套系统按相同的旋转调制策略独立运行,系统信息仅互为备份,缺乏有效融合。针对两台旋转惯导系统配置,开展基于器件信息深度融合的联合旋转调制策略研究,进一步提高系统精度。不改变单套系统结构和编排的前提下,优化经典的单轴4位置旋转方案,联合设计两套系统惯性测量单元(IMU)的旋转策略和转停时序,确保任一时刻有一台惯导处于转停状态,在时序上对转停状态下的惯性测量单元输出(陀螺仪和加速度计)信息进行融合,减小因惯性测量单元转动与刻度系数误差和安装误差的耦合效应。误差特性的理论分析验证了联合调制策略的优势。仿真结果表明:在典型误差作用下,采用联合旋转调制策略的系统定位误差,由单套旋转惯导系统精度的2.3 n mile/72 h提高到0.7 n mile/72 h。

旋转惯导姿态误差补偿方法分析

旋转惯导能够实现误差自补偿,从而提高系统导航精度。但旋转惯导中的旋转结构较为复杂,存在轴系的非正交误差、测角误差等,导致姿态输出随着旋转而发生波动,影响着惯导姿态解调输出的精度。针对惯导姿态误差补偿方法,选取4种常用的拟合补偿方法进行讨论,并结合实际采集数据,进行试验比对与分析,为后续工程应用提供参考。

光学陀螺旋转调制惯导系统及关键技术发展

面向长航时、高精度的自主导航技术需求,系统梳理光学陀螺旋转调制惯导系统的发展历程及关键技术现状具有重要的现实意义。首先,基于惯导系统误差特性,阐述了旋转调制技术的基本原理。其次,系统回顾和梳理欧美等西方国家旋转惯导系统发展历程,分析了系统发展演变后的技术逻辑,总结了我国旋转惯导系统的研制现状。最后,立足于提高系统自主导航精度,从旋转策略优化、误差标校、初始对准3个方面分析了旋转惯导系统需解决的关键技术及研究现状。在总结光学陀螺旋转调制惯导系统及关键技术发展基础上,针对后续旋转惯导系统研究提出了几点思考,为高精度自主导航技术研究提供参考。

一种旋转式惯导双轴同时连续旋转策略

旋转式惯导系统中,旋转策略的制定对导航精度有着重要影响。现阶段常用的旋转策略均为同一时刻只有一个旋转轴旋转,不能同时调制三个轴向的惯性器件误差,制约了长航时导航精度的进一步提高。针对此问题,提出了一种双轴同时连续旋转策略,可同时调制三个轴向的常值及慢变惯性器件误差。首先理论分析了所提策略的旋转调制机理,归纳了其角速度设置原则,符合该原则的双轴连续旋转策略可将三个轴向的惯性器件误差调制为不累积的周期项。然后,通过仿真和实验对比了所提旋转策略与双轴转位策略的导航结果。实验结果表明,采用所提旋转策略相比双轴转位策略,惯导系统24 h导航最大径向位置误差和径向速度误差分别平均减小了39%和28%。

AA3连续流动分析仪驱动马达带动转轴旋转模块设计及土壤中总氮测试

针对连续流动分析仪检测土壤中总氮时遇到的问题,研制了驱动马达带动转轴旋转模块.该模块可使混合的样品、试剂和空气保持在合适的温度区间进行中和反应,以利于后期利用连续流动分析仪在最优化条件下对样品进行检测分析,可将总氮的检出限从16.4µg/L降低至10.0µg/L,从而提高连续流动分析仪对样品的分析精度.

早期乳腺癌患者保乳术后行容积旋转调强放疗的剂量学参数与放射性肺炎的关系

目的探讨早期乳腺癌患者保乳术后行容积旋转调强放疗的剂量学参数与放射性肺炎(radiation pneumonitis,RP)的关系。方法选择2020年3月~2023年3月于本院住院治疗的140例保乳术后行容积旋转调强放疗的早期乳腺癌作为研究对象。根据放疗后是否发生RP将患者分为RP组(46例)和非RP组(94例)。所有患者中,1级RP有37例,2级RP有32例,3级RP有14例。比较两组患者的临床资料和剂量学参数。采用多元线性逐步回归肺功能指标与剂量学参数的相关性。采用多因素分析确定RP的独立风险预测因子。比较不同分级RP患者的基本资料及剂量学参数。采用广义混合效应模型分析剂量学参数与RP程度的关系。采用限制性立方样条模型分析剂量学参数与3级RP的剂量反应关系。结果两组患者在年龄、合并糖尿病、FEV1、MLD、患侧肺V_(5)、V_(10)、V_(20)和V30方面差异明显。年龄、糖尿病、FEV1、V_(5)和V_(20)均为影响患者RP发生的独立危险因素。3级RP患者年龄、合并糖尿病比例、FEV1<2 L比例、肺V_(5)和V_(20)明显升高(P<0.05)。广义混合效应模型结果显示,V_(5)和V_(20)与RP程度有关。限制性立方样条模型结果显示,V_(5)和V_(20)与3级RP的关联呈非线性的剂量反应关系(Pnon-linearity=0.426,0.537)。结论V_(5)和V_(20)是RP发生的独立危险因素,并且与患者RP程度具有一定相关性。临床应严格控制剂量-体积参数,以降低RP发生率。