Simultaneous guidance of electromagnetic and elastic waves via glide symmetry phoxonic crystal waveguides

A phoxonic crystal waveguide with the glide symmetry is designed,in which both electromagnetic and elastic waves can propagate along the glide plane at the same time.Due to the glide symmetry,the bands of the phoxonic crystal super-cell degenerate in pairs at the boundary of the Brillouin zone.This is the so-called band-sticking effect and it causes the appearance of gapless guided-modes.By adjusting the magnitude of the glide dislocation the edge bandgaps,the bandgap of the guided-modes at the boundary of the Brillouin zone,can be further adjusted.The photonic and phononic guided-modes can then possess only one mode for a certain frequency with relatively low group velocities,achieving single-mode guided-bands with relatively flat dispersion relationship.In addition,there exists acousto-optic interaction in the cavity constructed by the glide plane.The proposed waveguide has potential applications in the design of novel optomechanical devices.

Glide Scope视频喉镜在双腔支气管导管插管中的临床应用

目的评价Glide Scope视频喉镜应用于左侧双腔支气管导管插管中的应用价值。方法 ASA分级为Ⅰ、Ⅱ级择期胸科手术患者50例,随机平均分为Glide Scope视频喉镜(GSVL)组、Macintosh直接喉镜(MDLS)组,每组25例。分别观察Glide Scope视频喉镜和Macintosh型直接喉镜插左侧双腔支气管的到位情况、插管所用时间、气管损伤情况。结果 GSVL组25例均一次插入左主支气管,MDLS组2例旋转错位,4例反向错位,19例一次插入左主支气管,成功率为76%,两组比较差异有显著性(P<0.05);GSVL组较MDLS组的气管插管时间平均延长14s,GSVL组气管损伤发生率低于MDLS组,两组比较差异无显著性(P<0.05)。结论 G1ide Scope视频喉镜用于左侧双腔支气管插管时更容易暴露声门,插管成功率较高,且气管损伤小,但不能缩短插管时间。

Glide Scope视频喉镜在全麻气管插管中的应用

目的观察Glide Scope视频喉镜在全麻气管插管中应用的可行性。方法 60例择期手术准备行全麻气管插管患者,ASAⅠ～Ⅱ级,随机分为G组和P组,每组30例,术前处理和麻醉诱导相同。G组采用Glide Scope视频喉镜进行气管插管,P组采用普通直接喉镜进行气管插管。观察两组患者声门显露程度、插管次数、插管时间及手术前(T1)、诱导后(T2)、插管后1min(T3)、3 min(T4)、5 min(T5)的收缩压(SBP)、舒张压(DBP)、心率(HR)和插管操作引起的相关并发症。结果声门显露:G组30例均为1级。P组1级17例,2级7例,3级6例,两者相比差异有显著性(P<0.05)。插管时间:G组为(30±13)s,P组为(26±19)s,两组相比差异无显著性。血流动力学的变化两组无差异,但在T3时P组HR上升与术前(T1)相差异有显著性(P<0.05)。插管引起的相关并发症两组无差异。结论应用Glide Scope视频喉镜气管插管操作简单便捷,声门显露容易清晰,对咽喉部的刺激小,值得在临床推广应用。

阻塞性睡眠呼吸暂停综合征患者Glide Scope视频喉镜和Macintosh喉镜气管插管效果比较

目的:比较Glide Scope视频喉镜与Macintosh喉镜在阻塞性睡眠呼吸暂停综合征(OSAS)患者引导气管插管中的应用效果。方法:择期行悬雍垂腭咽成形术的OSAS患者60例,分为Glide Scope视频喉镜组(G组,n=30)和Macintosh喉镜组(M组,n=30)。术前应用改良Mallampati法对所有患者进行气道评估,诱导后分别用两种喉镜引导经鼻气管插管,记录Cormack-Lehane分级、插管时间及插管前后平均动脉压(pMA)、心率(fH)变化情况,计算首次插管成功率。结果:G组声门显露程度优于M组(Z=3.907,P<0.001),插管后G组pMA和fH的变化较M组明显轻微(t=2.473、2.647,P<0.05),首次插管成功率G组(86.7%)明显高于M组(63.3%)。结论:与Macintosh喉镜相比,Glide Scope视频喉镜能明显改善OSAS患者临床插管条件,可作为一种有效的插管工具推广应用。

Glide Scope可视喉镜与直接喉镜行气管插管对插管时间及咽喉损伤的影响

直视喉镜是全麻下气管插管最常用的工具，也是麻醉医生处理气道时的核心技能，尽管直视喉镜是气管插管的金标准，但意外的困难插管会增加病死率[1,2]。GlideScope可视喉镜（GS）是一种较新的插管工具，它可将气管插管整个过程变成可视操作，具有简便性、可控性和可视性，明显提高咽喉的暴露，减少对舌根部和咽喉部的刺激，然而关于插管时间以及对咽喉损伤没有明确定论[3,4]。

Glide Scope视频喉镜在气管插管患者留置胃管中的应用

目的探讨Glide Scope视频喉镜在气管插管患者留置胃管中的应用效果。方法将80例气管插管状态下需留置胃管的患者分为对照组和观察组各40例,对照组采用常规方法留置胃管,观察组在Glide Scope视频喉镜辅助下留置胃管,比较两组1次置管成功率和操作用时。结果观察组胃管置入操作用时较对照组短,1次置管成功率较对照组高,差异均有统计学意义(P<0.01);对照组有8例患者进行了3次以上的操作才置管成功。结论Glide Scope视频喉镜用于气管插管后患者留置胃管的操作,能提高置管1次成功率,缩短操作时间。

维迪欧视频喉镜和GlideScope视频喉镜在双腔支气管插管中的应用比较

目的评估维迪欧视频喉镜在择期肺叶切除术患者行全身麻醉诱导双腔支气管插管中的实用性和安全性。方法择期拟行经口左双腔支气管插管全身麻醉手术患者400例,美国麻醉医师协会(ASA)分级Ⅰ~Ⅲ级,年龄18~70岁。采用随机数表法将患者纳入A、B两组,A组代表GlideScope视频喉镜组,B组代表维迪欧视频喉镜组。记录两组插管时间、一次插管成功率、插管前后血流动力学波动、术后咽喉疼痛及声嘶等情况。结果A,B两组的插管时间差异无统计学意义,第1次插管成功率差异也无统计学意义;插管前后A,B两组的平均动脉压及心率的波动差异无统计学意义;拔管后1 h及拔管后1 d,A,B两组的术后声嘶的差异无统计学意义(均P≥0.05)。但A组在拔管1 d后轻度咽喉疼痛的发病率显著高于B组(14%vs 7.5%,P<0.05)。结论从插管时间、成功率,插管所导致的心血管反应,术后咽喉疼痛及声嘶等方面的结果来看,维迪欧视频喉镜可以安全应用于辅助DLT插管。

Coupled dynamic model of state estimation for hypersonic glide vehicle

Aiming at handling complicated maneuvers or other unpredicted emergencies for hypersonic glide vehicle tracking,three coupled dynamic models of state estimation based on the priori information between guidance variables and aerodynamics are presented. Firstly, the aerodynamic acceleration acting on the target is analyzed to reveal the essence of the target’s motion.Then three coupled structures for modeling aerodynamic parameters are developed by different ideas: the spiral model with a harmonic oscillator, the bank model with trigonometric functions of the bank angle and the guide model with the changing rule of guidance variables. Meanwhile, the comparison discussion is concluded to show the novelty and advantage of these models.Finally, a performance assessment in different simulation cases is presented and detailed analysis is revealed. The results show that the proposed models perform excellent properties. Moreover, the guide model produces the best tracking performance and the bank model shows the second; however, the spiral model does not outperform the maneuvering reentry vehicle(MaRV) model markedly.

Numerical and Experimental Studies on the Propulsion Performance of A Wave Glide Propulsor

This paper introduces a newly developed Unmanned Wave Glide Vehicle （UWGV）, which is driven only by extracting energy from gravity waves, and presents a comprehensive study on the propulsion performance of the UWGV＇s propulsor-Wave Glide Propulsor （WGP） in a regular wave. By simplifying the WGP as six 2D tandem asynchronous flapping foils （TAFFs）, a CFD method based on Navier-Stokes equations was first used to analyze the hydrodynamic performance of TAFFs with different parameters of non-dimensional wave length rn and non-dimensional wave height n. Then, a series of hydrodynamic experiments were performed. The computational results agree well with the experimental results when n〈0.07 and both of them show the thrust force and input power of the WGP are larger at smaller m or larger n. By analyzing the flow field of TAFFs, we can see that a larger m is beneficial to the forming, merging and shredding of the TAFFs＇ vortices; as TAFFs are arranged in tandem and have the same motions, the leading edge vortex and wake vortex of the TAFFs are meaningful for improving the thrust force of their adjacent ones.

Glide软件在机车活塞环组中的运用

本文利用AVL公司Glide软件在280机车用活塞环组的基础上,通过改变活塞环外圆面型线、弹力及闭口间隙等参数,分析其对活塞环组动力学性能(窜气量、环间压力及油膜厚度等)及机油消耗的影响并进行比较,为活塞环的设计提供参考。

Optimal Matching Analysis of Net Buoyancy and Pitching Angle for Underwater Gliders

Control parameter optimization is an efficient way to improve the endurance of underwater gliders(UGs),which influences their gliding efficiency and energy consumption.This paper analyzes the optimal matching between the net buoyancy and the pitching angle and proposes a segmented control strategy of Petrel-L.The optimization of this strategy is established based on the gliding range model of UG,which is solved based on the approximate model,and the variations of the optimal control parameters with the hotel load are obtained.The optimization results indicate that the segmented control strategy can significantly increase the gliding range when the optimal matching between the net buoyancy and the pitching angle is reached,and the increase rate is influenced by the hotel load.The gliding range of the underwater glider can be increased by 10.47%at a hotel load of 0.5 W.The optimal matching analysis adopted in this study can be applied to other UGs to realize endurance improvement.

Brief Introduction of a New Kind of Glide Path Antenna

A new kind of image type glide path beacon subsystem of Instrument Landing System (ILS) was reported. Capture effect is designed to overcome far-field (FF) reflectors and rising terrain. Low angle CSB signal was highly depressed, was ?41 dB at 1? comparative to the max value. Both Carrier and Side Bands (CSB) and Side and Bands Only (SBO) signals were radiated by three antennas. Difference in Depth of Modulation (DDM) provided good linear variation around glide path angle (θ). At near field area, the site of near-field (NF) monitor was just about 57 m in front of the system, needed less length of reflection plane than that of M-array system, result from the system had only 90% of the M-Array antenna height.

Glide Scope视频喉镜在全麻剖宫产术气管插管中的应用

目的评价Glide Scope视频喉镜应用于全麻剖宫产手术气管插管的有效性和安全性。方法择期行全麻剖宫产手术患者30例,随机分为M组与G组,每组15例。M组采用McCoy喉镜行气管插管术, G组采用Glide Scope视频喉镜行气管插管术。记录2组声门暴露分级、一次插管成功例数、插管时间;记录2组麻醉诱导前(T 1)、插管后即刻(T 2)、插管后 1 min (T 3)、插管后5 min(T 4)的心率(HR)和平均动脉压(MAP);记录2组插管后口咽黏膜损伤、牙齿牙龈损伤、拔管后咽痛和声音嘶哑等不良反应的发生情况。结果 G组声门暴露分级显著低于M组( P <0.05),插管时间显著短于M组( P < 0.05)。2组一次插管成功例数比较,差异无统计学意义( P >0.05)。M组T 2时点的HR、MAP显著高于G组( P <0.05)。 G组的气管插管不良反应发生率显著低于M组( P <0.05)。结论 Glide Scope视频喉镜应用于全麻剖宫产手术气管插管具有声门暴露容易、气管插管成功率高、插管时间短、不良反应少等优势。

Glide Scope视频喉镜在急诊气管插管中的应用

目的评价Glide Scope视频喉镜在急诊气管插管中的应用。方法将92例分为两组，视频喉镜组45例。普通喉镜组42例，另有5例为先经普通喉镜操作，经两次试插失败者，改视频喉镜操作。分别记录每个患者所用插管时间、一次成功率和插管并发症发生率。结果两组经单一方法插管成功者，视频喉镜组插管所用时间显著短于普通喉镜组（P〈0．01），但其中一次插管成功者所用时间，视频喉镜组与普通喉镜组无显著性差异（P〉0.05）。视频喉镜组插管一次成功率略高于普通喉镜组（91．1％vs78．6％），但无统计学意义。视频喉镜组插管并发症发生数较低，插管时需应用镇静剂人数亦较少。5例普通喉镜插管两次失败者，改视频喉镜后，气管插管困难分级改善至Ⅱ～Ⅲ级而成功插管。结论Glide Scope视频喉镜可作为急诊气管插管，特别是困难插管的一种选择。

基于GLIDE软件的发动机活塞型线设计优化

本文讲述了AVL GLIDE软件的分析与评价方法,并以某83a活塞的型线设计开发为例,介绍了基于GLIDE软件的活塞型线及其他动力性能参数的优化过程,并通过试验进行了验证。实验结果证明,GLIDE软件可有效的模拟活塞运动过程,进行活塞动力学的计算,对于活塞的设计及优化具有重要的意义。

利用Glide软件 优化设计活塞摩擦副组

本文结合发动机改进优化课题 ,对目前发动机摩擦副设计中面临的问题进行了阐述 ,并详述了活塞及其摩擦副优化设计的一套行之有效的方法。文章综合了有限元模拟分析计算 (CAE)、Glide软件、发动机零部件温度场试验及经验设计等方法 ,建立了一套科学有效的活塞设计开发体系 ,进行优化设计 ,再结合发动机台架试验、活塞单项试验 ,进行试验验证 ,最后根据试验情况进行设计改进。

ANALYSIS OF AERODYNAMIC CHARACTERISTIC ON GLIDE BULLET TO INCREASE RANGE

This paper mainly calculates, analyzes and compares the aerodynamic characteristics of two kinds of bullets, one has wing, and the other has no wing. The calculated results indicate that the lift force of the glide bullet with wing is much bigger than that has no wing, and it reached the aim to increase range.

INFLUENCE OF TWINNING AND DISLOCATION GLIDE DURING CREEP OF EQUIAXED AND LAMELLAR TiAl ALLOYS

The creep deformation of two near γ titanium aluminide alloys with equiaxed and lamellar structures have been studied to understand their behaviour as a function of microstructural evolution during the early stages of creep. The lamellar alloys exhibit more pronounced hardening during the primary stage of creep leading to a much better creep resistance and a minimum creep rate two orders of magnitude lower than that of the equiaxed alloys. TEM observations have confirmed that the active deformation mechanisms are the same for both alloys and microstructural states, namely extensive slip of single 1/2〈110〉 dislocations and mechanical twinning. The latter has been comfirmed to occur in a fraction of the grains that never exceeds 50% while 1/2〈110〉 dislocations are active within all the γ grains. The twins are only responsible for a small amount of strain but they lead to a subdivision of the microstructure and determine (directly or indirectly) the hardening process observed during the primary stage of creep. During the secondary stage the creep rate is determined by the unblocking of pinned dislocations by processes such as a pipe diffusion or cross slip that allow thermally activated glide of 1/2〈110〉 dislocations within the γ matrix.

Adaptive Constrained On-board Guidance Technology forPowered Glide Vehicle

To make full use of expanded maneuverability and increased range,adaptive constrained on-board guidance technology is the key capability for a glide vehicle with a double-pulse rocket engine,especially under the requirements of desired target changing and on-line reconfigurable control and guidance.Based on the rapid footprint analysis,whether the new target is within the current footprint area is firstly judged.If not,the rocket engine ignites by the logic obtained from the analysis of optimal flight range by the method of hp-adaptive Gauss pseudospectral method(hp-GPM).Then,an on-board trajectory generation method based on powered quasi-equilibrium glide condition(QEGC)and linear quadratic regulator(LQR)method is used to guide the vehicle to the new target.The effectiveness of the guidance method consisted of powered on-board trajectory generation,LQR trajectory tracking,footprint calculation,and ignition time determination is indicated by some simulation examples.

Glide landmark detection using band-limited energy ratio contours

A detection system for American English glides/w y r 1] in a knowledge-based automatic speech recognition system is presented. The method uses detection of dips in band-limited energy to total energy ratios, instead of detecting dips along the unmodified band-limited energy contours. By using band-limited energy ratio, the dip detection is applicable in not only intervocalic regions but also in non-intervocalic regions. A Gaussian mixture model（GMM） based classifier is then used to separate the detected vowels and nasals. This approach is tested using the TIMIT corpus and results in an overall detection rate of 69.5 %, which is a 4.7 % absolute increase in detection rate compared with an hidden Markov model （HMM） based phone recognizer.