查询词典 cycle track

Based on rail/wheel reaction and track/bride reaction theory and systems engineering theory, new vehicle-track and vehicle-track-bridge system dynamic models are established and discussed in details, including ballast track model and ballastless track model. The characteristics of the models are:(1) vehicle-track and vehicle-track-bridge system dynamic models are coupled in vertical and lateral;(2) track vibration on bridge is taken in account, track on bridge is considered as one or two layer continuous-point supported rail model, according to actual track structure, interaction between vehicle and bridge transfer from track structure;(3) three type of ballastless track models (tieembanked, elastic-tie-block, slab track) are presented;(4) models reflect the main feature of actual vehicle, track and bridge structure, the response computation frequency of models is relatively broad, which can be applied to analyze both low frequency and high frequency vibration.

基于轮轨相互作用和线桥相互作用特点，本文从系统工程角度出发建立了车辆、有碴轨道和无碴轨道、简支箱梁桥垂向和横向耦合系统动力分析模型，该系统模型具有以下特点：（1）车线、车线桥体系均考虑为垂向、横向耦合振动系统，车线间通过轮轨接触几何关系耦合，轨道与桥梁间通过轨道与梁体间的力与位移协调条件耦合；（2）充分考虑桥上线路在车线桥系统中参振作用，根据桥上线路轨道结构特点将桥上轨道结构模型具体化，即对桥上轨道结构视为多层支承体系，车桥间的动力作用通过轨道结构来传递；（3）建立了三种形式无碴轨道动力分析模型，即长轨枕埋入式、弹性支承块式和轨道板式无碴轨道模型；（4）系统模型详细，分析频带宽，适用范围较广。

The effects and mechanism of GABAergic neurons, NOergic neurons, opioid peptide and cyclic adenosine monophosphate in the nucleus reticularis thalami on sleep-wakefulness cycle of rats and the effects and mechanism of the 5-HTergic nerve fibers project from the nucleus raphes dorsalis to RT on sleep-wakefulness cycle of rats were investigated with the methods of brain stereotaxic, nucleus spile, microinjection and polysomngraphy.1. The effects of GABAergic neurons in RT on sleep-wakefulness cycle of rats1.1 Microinjection of 3-mercaptopropionic acid (3-MP, a kind of glutamate decarboxylase inhibitor) into RT. On the day of microinjection, sleep only decreased a litter. On the second day, sleep marked decreased and wakefulness marked increased. On the third and fourth day, sleep and wakefulness stages resumed to normal.1.2 Microinjection of gamma-amino butyric acid (GABA 1.0μg) into RT enhanced sleep and reduced wakefulness compared with control; while microinjection of L-glutamate (L-Glu, 0.2μg) decreased sleep and increased wakefulness; microinjection of bicuculline (BIC, 1.0μg), a GABAA receptor antagonist, enhanced wakefulness and reduced sleep; microinjection of baclofen (BAC, 1.0μg), GABAB receptor agonist, had the same effects as GABA.2. The effects of NOergic neurons in RT on sleep-wakefulness cycle of rats2.1 Microinjection of L-arginine (L-Arg, 0.5μg) into RT decreased sleep compared with control, but there were on statistaical difference between L-Arg group and control; while microinjection of sodium nitroprusside (SNP, 0.2μg), a NO donor into RT, sleep marked decreased and wakefulness marked increased. Microinjection of nitric oxide synthase inhibitor, N-nitro-L-arginine (L-NNA, 2.0μg) into RT enhanced sleep and reduced wakefulness.2.2 After simultaneous microinjection of L-NNA (2.0μg) and SNP (0.2μg) into RT, SNP abolished the sleep-promoting effect of L-NNA compared with L-NNA group; after simultaneous microinjection of L-NNA (2.0μg) and L-Arg(0.5μg) into RT, we found that L-NNA could not blocked the wakefulness-promoting effect of L-Arg.3. The effects of opioid peptide in RT on sleep-wakefulness cycle of rats3.1 Microinjection of morphine sulfate (MOR, 1.0μg) into RT increased wakefulness and decreased sleep compared with control; while microinjection of naloxone hydrochloride (NAL, 1.0μg), the antagonist of opiate receptors, into RT, enhanced sleep and reduced wakefulness.3.2 After simultaneous microinjection of MOR (1.0μg) and NAL (1.0μg) into RT, the wakefulness-promoting effect of MOR and the sleep-promoting effect of NAL were not observed compared with control.4. The effects of cAMP in RT on sleep-wakefulness cycle of rats Microinjection of cAMP (1.0μg) into RT increased sleep and decreased wakefulness compared with control; microinjection of methylene blue (MB,1.0μg) into RT enhanced sleep and reduced wakefulness compared with control.5. The effects of the 5-HTergic nerve fibers project from DRN to RT on sleep-wakefulness cycle of rats5.1 When L-Glu (0.2μg) was microinjected into DRN and normal sodium (NS,1.0μg) was microinjected into bilateral RT. We found that sleep was decreased and wakefulness was increased compared with control; when L-Glu (0.2μg) was microinjected into DRN and methysergide (MS,1.0μg), a non-selective 5-HT antagonist, was microinjected into bilateral RT, We found that sleep was enhanced and wakefulness was reduced compared with L-Glu group.5.2 When p-chlorophenylalanine (PCPA, 10μg) was microinjected into DRN and NS (1.0μg) was microinjected into bilateral RT, We found that sleep was increased and wakefulness was decreased compared with control; microinjection of 5-hydroxytryptaphan (5-HTP, 1.0μg), which can convert to 5-HT by the enzyme tryptophane hydroxylase and enhance 5-HT into bilateral RT, could block the effect of microinjection of PCPA into DRN on sleep-wakefulness cycle.

本研究采用脑立体定位、核团插管、微量注射、多导睡眠描记等方法，研究丘脑网状核(nucleus reticularis thalami，RT)中γ-氨基丁酸(gamma-amino butyric acid ，GABA)能神经元、一氧化氮(nitrogen monoxidum，NO)能神经元、阿片肽类神经递质、环一磷酸腺苷(cyclic adenosine monophosphate，cAMP)及中缝背核(nucleus raphes dorsalis，DRN)至RT的5-羟色胺(5-hydroxytryptamine，5-HT)能神经纤维投射对大鼠睡眠-觉醒周期的影响及其作用机制。1 RT内GABA能神经元对大鼠睡眠-觉醒周期的影响1.1大鼠RT内微量注射GABA合成关键酶抑制剂3-巯基丙酸(3-MP，5μg)，注射当天睡眠时间略有减少，第二日睡眠时间显著减少，觉醒时间明显增多，第三、四日睡眠和觉醒时间逐渐恢复至正常。1.2大鼠RT内微量注射GABA受体激动剂GABA( 1.0μg)后，与生理盐水组比较，睡眠时间增加，觉醒时间减少；而RT内微量注射L-谷氨酸(glutamic acid， L-Glu， 0.2μg)后，睡眠时间减少，觉醒时间增加；RT内微量注射GABAA受体阻断剂荷包牡丹碱(bicuculline，BIC，1.0μg)后，睡眠时间减少，觉醒时间增加；RT内微量注射GABAB受体激动剂氯苯氨丁酸(baclofen，BAC，1.0μg)后，产生了与GABA相似的促睡眠效果。2 RT内NO能神经元对大鼠睡眠-觉醒周期的影响2.1大鼠RT内微量注射NO的前体L-精氨酸(L-Arg，0.5μg)后，与生理盐水组对比，睡眠时间略有减少，但无显著性意义；而RT内微量注射NO的供体硝普钠(Sodium Nitroprusside，SNP，0.2μg)后可明显增加觉醒时间，缩短睡眠时间；微量注射一氧化氮合酶抑制剂L-硝基精氨酸(L-arginine，L-NNA，2.0μg)后，引起睡眠时间增多，觉醒时间减少。2.2大鼠RT内同时微量注射L-NNA(2.0μg)和SNP(0.2μg)后与L-NNA组比较发现SNP逆转了L-NNA的促睡眠作用；RT内同时微量注射L-NNA(2.0μg)和L-Arg(0.5μg)后，与L-NNA(2.0μg)组比较发现L-Arg可以增加觉醒而缩短睡眠，其促觉醒作用未能被NOS的抑制剂L-NNA所逆转。3 RT内阿片肽对大鼠睡眠-觉醒周期的影响3.1大鼠RT内微量注射硫酸吗啡(morphine sulfate，MOR，1.0μg)后与生理盐水组对比，睡眠时间减少而觉醒时间增加； RT内微量注射阿片肽受体拮抗剂盐酸纳洛酮(naloxone hydrochloride，NAL，1.0μg)后与生理盐水组比较，睡眠时间增加而觉醒时间减少。3.2大鼠RT内同时微量注射MOR(1.0μg)和NAL(1.0μg)后，与生理盐水组对比，原有的MOR促觉醒效果和NAL的促睡眠效果都没有表现。4 RT内环一磷酸腺苷信使对大鼠睡眠-觉醒周期的影响大鼠RT内微量注射cAMP(1.0μg)后与NS(1.0μg)组比较，睡眠时间增多而觉醒时间减少；RT内微量注射亚甲蓝(methylene blue，MB，1.0μg)后，与NS组比较，睡眠时间增多而觉醒时间减少。5中缝背核投射到丘脑网状核的5-羟色胺能神经纤维对大鼠睡眠-觉醒周期的影响5.1大鼠DRN内微量注射L-Glu(0.2μg)，同时在双侧RT内微量注射NS (1.0μg)后，与对照组(DRN和双侧RT注射NS， 0.2μg)比较，睡眠时间减少，觉醒时间增多；大鼠DRN内微量注射L-Glu(0.2μg)，同时在双侧RT内微量注射二甲基麦角新碱(methysergide， MS， 1.0μg )后，与对照组(DRN注射L-Glu 0.2μg，双侧RT注射NS 1.0μg)比较，睡眠时间增多，觉醒时间减少。5.2大鼠DRN内微量注射对氯苯丙氨酸(p-chlorophenylalanine，PCPA，10μg)，同时在双侧RT内微量注射NS (1.0μg)后，与对照组(DRN和双侧RT注射NS， 1.0μg)比较，睡眠时间增多，觉醒时间减少；大鼠DRN内微量注射PCPA(10μg)，产生睡眠增多效应后，在双侧RT内微量注射5-羟色胺酸(5-hydroxytryptaphan ， 5-HTP， 1.0μg )后，与对照组(DRN注射PCPA 10μg，双侧RT注射NS 1.0μg)比较，睡眠时间减少，觉醒时间增多。

During the course of the short-cycle correlation, This paper assembleds the descending cycle of early cycle and the ascending cycle of late cycle, which are conjointed together , begin to correlate and draw the ichnography . By this method , writer can consider the two connected sandbodies as one unit to analyse , and can contact the sand units of exploitatition in the oilfield. Then analyse the distributing and the continuity of the sandbodies in the medium-cycle, the distributing and the continuity of oil and gas in the short-cycle.

每个中期旋回包括 3-4 个短期旋回，在短期旋回的对比中，将垂向上相邻的早期短期旋回的下降半旋回和晚期短期旋回的上升半旋回组合到一起进行对比划分和平面成图，这使得相邻两套的粉砂岩作为一个单元进行分析，与油田开发中的小层紧密的结合到一起。

Firstly, from Gauss' equations and relative motion equations, the relation of control impulse and relative motion was expressed as analysis formulas and simplified based on the near circular condition. By deeply analyzing the mechanism of impulses in each directions (radial, in-track and cross-track directions) effect on relative motion respectively, two maneuvers to establish formation flying are provided: one is to utilize the impulses in radial and cross-track directions, the other is to utilize the impulses in along-track and cross-track directions. Both of the two methods can establish satellite formation flying of any configuration. The method with impulses irradial and cross-track directions needs only 3 impulses, while the method with impulses in along-back and cross-track directions needs 4 impulses. Lastly, by an example of establishing a space-circle formation flying, two maneuvers were compared with each other in the amount of impulses and fuel consuming estimation.

首先由高斯型拉格朗日轨道摄动运动方程得到轨道坐标系中控制冲量与轨道根数偏差的关系，基于近圆轨道的条件简化并带入相对运动方程，得到控制冲量与相对运动的关系表达式；通过深入分析各个方向（径向、沿迹向与轨道面法向）的控制冲量对相对运动的影响，给出了分别用径向与轨道面法向控制冲量组合和沿迹向与轨道面法向控制冲量组合实现编队捕获的两种控制策略；最后给出了一个空间圆编队捕获实例，并从燃料消耗、施加冲量次数及捕获时间等角度对比研究了两种控制策略的特点。

Track roller: Singe flange 4 Double flange 2 Carrier roller: 2 Idler 1 Type of track: single grouser combined Tension mode of track: hydraulic Pitch: 203 mm Number of shoes 38 pieces Width of shoe 500 mm Length of track on ground 2570 mm Sealed and lubricated track ▲▲The pitch , numbers and width of track shoes are the same with the general track.

支重轮 单边四个双边二个托链轮二个引导轮一个履带型式单履齿组合式履带涨紧型式液压涨紧节矩 203 mm 履带板数 38 块履带板宽 500 mm 履带接地长度 2570 mm 密封和润滑履带▲▲该履带的节距、履带板数、履带板宽与普通的履带相同。

Wheel/rail noise of the high-speed slab track on concrete bridge and that of the urban elevated supporting block track are predicted respectively. Noise of the slab track, compared with that of the ballasted track, is more severe. The noise of the slab track is about 6.2dBA higher than that of the ballasted track for the receiver nearby the rail, and about 3.5dBA higher than that of ballast track for the receiver

对降低高速铁路桥上板式无碴轨道及城市轨道交通桥上支承块式无碴轨道轮轨噪声的技术措施进行了研究，包括：(1)分别就板式轨道和支承块式轨道结构参数的低噪声设计原则进行了研究；(2)对几种典型的新型轨道用吸声材料的降噪效果进行了分析，结果表明降噪效果显著；(3)就声屏障高度、位置、形状以及声屏障内侧敷设吸声材料对降噪效果的影响进行了分析，结果表明：声屏障越高、越接近轨道，降噪效果越好；声屏障内侧敷设吸声材料，可降低钢轨近旁噪声2.0～3.0dBA，可降低近地面噪声约1.5～2.0dBA

Newest arrival of shipment legal copy Hong Kong NewRay brand alloy vehicle mold: P42DC American AMTRAK the railroad company P42DC skeleton line train model, the famous American AMTRAK nation railroad company has in the world quantity most railway engines and the compartment, each time AMTRAK railway engine all is the American economy development transportation person who has rendered meritorious service, the rough iron-covered front of a train and Europe's electric train fine forms clearly the opposite contrast, is object which the world train amateur pursues vigorously holds. 1 to 87 proportions, the zinc base alloy +ABS engineering plastics material quality, the ultra fine paint surface works, independent power front of a train +2 compartments, may assemble at will, the unique fluctuation type from the charge system, uses 4 ordinary 5th battery then, charges a minute then to let the train run quickly 3 minutes on the track, the ultra long ultra multi- varieties from assemble the track, but freely assembles the track shape which any you likes, track most large diameter may achieve 127.5 centimeters, in have 8 straight axles, 10 curves axles, And has the cross overlapping track, may transform the direction respectively toward to change a track 2 and the charge platform station and so on the special track east, absolutely is you is unable to put down ultra is very fond of east, is presents the present certainly good to choose!

最新到货的正版香港NewRay品牌合金车模： P42DC 美国AMTRAK铁路公司P42DC型干线列车模型，著名的美国AMTRAK全国铁路公司拥有世界上数量最多的火车头和车厢，每个时代的AMTRAK的火车头都是美国经济发展的运输功臣，粗犷的铁皮车头与欧洲的电气列车的精致形成截然相反的对比，是全世界火车爱好者极力追捧的对象。1比87比例，锌合金+ABS工程塑料材质，超精致的漆面做工，一个独立动力车头+2节车厢，可随意拼装，独特的升降式自充电系统，使用4节普通的5号电池即可，充电一分钟即可让火车在轨道上奔驰3分钟，超长超多品种的自组装轨道，可自由组装任何你喜欢的轨道形状，轨道的最大直径可达到127.5厘米，内有8根直轨，10根弯道轨，并配有十字交叉轨道、可变换方向的分向变道轨道2根和充电月台基站等特殊轨道，绝对是你爱不释手的超酷好东东，更是馈送礼品的绝佳选择！

Newest arrival of shipment legal copy Hong Kong NewRay brand alloy vehicle mold: F7 American AMTRAK the railroad company F7 skeleton line train model, the famous American AMTRAK nation railroad company has in the world quantity most railway engines and the compartment, each time AMTRAK railway engine all is the American economy development transportation person who has rendered meritorious service, the rough iron-covered front of a train and Europe's electric train fine forms clearly the opposite contrast, is object which the world train amateur pursues vigorously holds. 1 to 87 proportions, the zinc base alloy +ABS engineering plastics material quality, the ultra fine paint surface works, independent power front of a train + three compartments, may assemble at will, the unique fluctuation type from the charge system, uses 4 ordinary 5th battery then, charges a minute then to let the train run quickly 3 minutes on the track, the ultra long ultra multi- varieties from assemble the track, but freely assembles the track shape which any you likes, track most large diameter may achieve 127.5 centimeters, in have 8 straight axles, 10 curves axles, And has the cross overlapping track, may transform the direction respectively toward to change a track 2 and the charge platform station and so on the special track east, absolutely is you is unable to put down ultra is very fond of east, is presents the present certainly good to choose!

最新到货的正版香港NewRay品牌合金车模： F7 美国AMTRAK铁路公司F7型干线列车模型，著名的美国AMTRAK全国铁路公司拥有世界上数量最多的火车头和车厢，每个时代的AMTRAK的火车头都是美国经济发展的运输功臣，粗犷的铁皮车头与欧洲的电气列车的精致形成截然相反的对比，是全世界火车爱好者极力追捧的对象。1比87比例，锌合金+ABS工程塑料材质，超精致的漆面做工，一个独立动力车头+三节车厢，可随意拼装，独特的升降式自充电系统，使用4节普通的5号电池即可，充电一分钟即可让火车在轨道上奔驰3分钟，超长超多品种的自组装轨道，可自由组装任何你喜欢的轨道形状，轨道的最大直径可达到127.5厘米，内有8根直轨，10根弯道轨，并配有十字交叉轨道、可变换方向的分向变道轨道2根和充电月台基站等特殊轨道，绝对是你爱不释手的超酷好东东，更是馈送礼品的绝佳选择！

Newest arrival of shipment legal copy Hong Kong NewRay brand alloy vehicle mold: F59PHI American AMTRAK the railroad company F59PHI skeleton line train model, the famous American AMTRAK nation railroad company has in the world quantity most railway engines and the compartment, each time AMTRAK railway engine all is the American economy development transportation person who has rendered meritorious service, the rough iron-covered front of a train and Europe's electric train fine forms clearly the opposite contrast, is object which the world train amateur pursues vigorously holds. 1 to 87 proportions, the zinc base alloy +ABS engineering plastics material quality, the ultra fine paint surface works, independent power front of a train +2 compartments, may assemble at will, the unique fluctuation type from the charge system, uses 4 ordinary 5th battery then, charges a minute then to let the train run quickly 3 minutes on the track, the ultra long ultra multi- varieties from assemble the track, but freely assembles the track shape which any you likes, track most large diameter may achieve 127.5 centimeters, in have 8 straight axles, 10 curves axles, And has the cross overlapping track, may transform the direction respectively toward to change a track 2 and the charge platform station and so on the special track east, absolutely is you is unable to put down ultra is very fond of east, is presents the present certainly good to choose !

最新到货的正版香港NewRay品牌合金车模： F59PHI 美国AMTRAK铁路公司F59PHI型干线列车模型，著名的美国AMTRAK全国铁路公司拥有世界上数量最多的火车头和车厢，每个时代的AMTRAK的火车头都是美国经济发展的运输功臣，粗犷的铁皮车头与欧洲的电气列车的精致形成截然相反的对比，是全世界火车爱好者极力追捧的对象。1比87比例，锌合金+ABS工程塑料材质，超精致的漆面做工，一个独立动力车头+2节车厢，可随意拼装，独特的升降式自充电系统，使用4节普通的5号电池即可，充电一分钟即可让火车在轨道上奔驰3分钟，超长超多品种的自组装轨道，可自由组装任何你喜欢的轨道形状，轨道的最大直径可达到127.5厘米，内有8根直轨，10根弯道轨，并配有十字交叉轨道、可变换方向的分向变道轨道2根和充电月台基站等特殊轨道，绝对是你爱不释手的超酷好东东，更是馈送礼品的绝佳选择！

As the track space increasing, the holding power which flexible holding parts act on sugarcane is dropping off. As the canvas layers and length of flexible holding part increasing, the track space is also increased when flexible holding parts act on sugarcane same holding power. As the length of flexible holding part increasing, the rate of slope of holding power following the track space to change would be decreased, so holding power would vary slowly. The holding power has a better linear relationship with the track space. Holding sugarcane stalk on knot or not on knot, sugarcane stalk having leaves or without leaves, the holding power would have not significant difference. Considering the structure of device and stress of sugarcane, 4-layers canvas conveyer belt was used as flexible holding part, while its length is 120mm, 160mm, or 200mm, the corresponding maximum track space is 135mm, 183mm, or 235mm. Experimental investigation of sugarcane windrowing was done on the arc-track-type flexible holding and conveying test mechanism.

随着轨道间距的增大，柔性夹持元件施加给甘蔗的夹持力逐渐减少；施加给甘蔗相同的夹持力，随着柔性夹持元件帆布帘层数和长度的增加，对应的轨道间距增加；随着柔性夹持元件长度的增大，柔性夹持元件施加给甘蔗的夹持力随轨道间距变化的斜率减小，夹持力大小的变化越缓慢；柔性夹持元件提供的夹持力与轨道间距均呈线性关系；柔性夹持元件夹在甘蔗节上还是不夹在节上，甘蔗有叶还是无叶，其施加给甘蔗的夹持力无显著差异；从夹持输送装置结构以及甘蔗的受力情况来考虑，选择4层帆布帘输送带作为柔性夹持元件更能平稳、柔和地夹持输送甘蔗，4层帆布帘120mm、160mm、200mm长的柔性夹持元件夹持甘蔗所需最大轨道间距为135mm 、183mm、235mm。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。