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obstacle
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  障碍
     Obstacle Detection and Self-localization for Mobile Robots by Using Laser Range Finders
     基于激光雷达的移动机器人障碍检测和自定位
短句来源
     Exploiting Obstacle of Information and Setting up the Digital Information Platform of Chinese Medical Ancient Books
     中医古籍信息利用障碍与数字化信息平台构建
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     A Preliminary Investigation on Physiological and Biochemical Changes Caused by the 500m Obstacle Race
     500米障碍跑的某些生理生化指标初探
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     Obstacle Factors of Rehabilitation after Cerebrovascular Disease: Analysis of 100 Cases
     脑血管病后康复治疗中的障碍因素(附100例分析)
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     A mixed finite element of the fourth obstacle problem
     四阶障碍问题的混合有限元法
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  障碍物
     Analysis of Flow Field after Gaseous Detonation Wave is Mach Reflected on an Obstacle
     气相爆轰波在障碍物上Mach反射后流场的分析
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     ALGORITHMS OF ENVIRONMENT UNDERSTANDING AND OBSTACLE DETECTION BASED ON MULTISENSOR DATA FUSION
     基于多传感器数据融合的环境理解及障碍物检测算法
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     An Obstacle Detection Method Based on Surface Direction
     基于表面方向的障碍物检测方法
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     Obstacle Detection and Recognition of Robotics Based on Multi-Sensor Fusion
     基于多传感器融合的机器人障碍物检测和识别
短句来源
     Study on Method for Obstacle Position Calculation Based on Ultrasonic Sensor Array
     基于超声波传感器阵列的障碍物位置计算方法研究
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     VFF~+:Improved Virtual Force Field Obstacle Avoidance Algorithm for Mobile Robot
     VFF~+:改进的虚拟力场移动机器人障算法
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     Three primitive behaviors called global path following, obstacle avoidance and head for goal behaviors are used for the local path planning.
     在局部路径规划器中 ,设计了三种基本行为 :跟踪全局路径的行为、碰的行为和目标制导的行为 ,采用基于行为的方法进一步优化路径 .
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     An RRT Based Obstacle Avoidance Motion Planning Algorithm for Free-flying Space Robot
     基于RRT算法的自由飞行空间机器人碰运动规划
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     Chaos of planar 3R redundancy robot when carrying out an obstacle avoidance planning
     平面3R冗余度机器人进行障规划时的混沌
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     The features of obstacle avoidance in robot soccer control,the mathematic description of obstacles are introduced,and the advantages and disadvantages of artificial potential fields in robot soccer control are analyzed.
     介绍了足球机器人障控制的特点 ,障碍物的数学描述和检测方法 ,把人工势场理论引入到足球机器人障控制中 ,并分析了人工势场法的优点和不足 .
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  “obstacle”译为未确定词的双语例句
     Obstacle Problem for Hessian Operator
     Hessian算子的Obstacle问题(英文)
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     EFFECT OF STREAMLINE CURVATURE AND SOME OTHER CONDITIONS ON THE TURBULENT STRUCTURES IN THE OTHER REGION OF AN OBSTACLE
     EFFECT OF STREAMLINE CURVATURE AND SOME OTHER CONDITIONS ON THE TURBULENT STRUCTURES IN THE OTHER REGION OF AN OBSTACLE
短句来源
     Examination and Treatment of the Obstacle Setfor Adjusting Zero for the Spectrophotometer of 721 and 751 G Type
     721、751G分光光度计校正调零故障的检查与处理
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     The Calculation and Testing on Car's Ability of Surmounting Vertical Obstacle
     汽车垂直越障能力的计算及试验
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     Obstacle and Adjustment to the System of Technology Transference
     技术转让系统的故障与调整
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  obstacle
The uniqueness of the geodesic by its initial values severely restricts the choice of the fiber path and is an obstacle to the production of optimized structures.
      
Dirichlet problem for the implicit obstacle problems
      
In this paper the implicit obstacle problem of fully nonlinear second-order elliptic equations associated with impulsive control problem are investigated.
      
Analysis of two-dimensional electromagnetic scattering by a perfectly conducting obstacle in a homogeneous chiral environment
      
The time-harmonic electromagnetic plane waves incident on a perfectly conducting obstacle in a homogeneous chiral environment are considered.
      
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Among collections chiefly from North China,different races of Pucciniaglumarum were identified by means of differential hosts used by Gassner & Straibor a set of improved varieties of wheat grown in China. Among 14 improved varieties,marked differences in resistance to stripe rustwere observed.Li-Yung I was resistant to 40 out of 50 collections of striperust,with unstable reactions to 7 collections; Nanking 4197 was resistant to 37 ??collections with unstable reactions to 9 collections; while Yechao 35368 and...

Among collections chiefly from North China,different races of Pucciniaglumarum were identified by means of differential hosts used by Gassner & Straibor a set of improved varieties of wheat grown in China. Among 14 improved varieties,marked differences in resistance to stripe rustwere observed.Li-Yung I was resistant to 40 out of 50 collections of striperust,with unstable reactions to 7 collections; Nanking 4197 was resistant to 37 ??collections with unstable reactions to 9 collections; while Yechao 35368 and Ye-Ta 1885 were susceptible to all except 5 collections from FJymus ckinense.Theinstability of varietal reactions is one of the principal obstacles in identification.As a consequence,tests with 6 improved varieties including Early Premium,Pi-Ma 1,etc.,only 21 out of 50 stripe rust collections could be differentiated into10 distinctly different races (Y 1 to Y10).However,there were great differencesin pathogenicity among different races so far identified.All the 6 improvedvarieties were resistant to race Y 1 and susceptible to race Y 2.The virulenceof other races differed from one another also pronouncedly. Races Y2,Y3,Y4,Y5 ,Y6,Y7 ,and Y8 were collected from wheat; Y 9 andY10 from Agropyron spp.; and Y1 was collected mainly from Elymus chinense(including 1 collection from wheat).Races Y 1,Y 3.Y 4,Y 5,Y 7,Y 8,Y 9,Y 10were found in Hopeh; Y 1,Y 2,Y 6,Y 7 in Shansi; and Y 6 in Shantung. All collections could be readily grouped into 16 different forms if the highestreaction type was taken as a basis for identification (this method of groupingwas adopted by Fang et al).Comparing the results with that of Fang et al,itappeared that reactions of certain varieties,such as Early Premium,Li-Yung 1 tocollections from North China were distinctly different from their reactions tocollections from East China.This suggested strongly that races of stripe rustorganism between these two regions might be quite different. All wheat varieties tested were found to be resistant to stripe rust collectionsfrom Elymus chinense.whereas collections from Elymus sibiricus and Agropyronspp.were capable of attacking many wheat varieties. Single spore infection of stripe rust frequently resulted in sporulation on thewhole leaf blade.This is definitely much more systemic than infections of eitherstem rust or leaf rust organism.Inoculations with single uredospores and mono-uredospore lines often produced mixtures of infection types ranging from resistantto susceptible on same leaf blades.This is analogous to "X" type reactions re-ported in stem rust and leaf rust literature; therefore,"X" type reaction shouldalso be recognized in the study of stripe rust.

1950年以来自华北以及少数其他地区搜集的条銹菌种,不論在Gassner和Straib所用的鑒定寄主或在国內推广品种上鑒定,都可区分出許多不同的类型。所用14个推广品种对于这些条绣菌种的抗病性有着很大的差別;其中以驪英1号最抗病,对50个菌种中的40个菌种是抵抗的,对7个菌种反应不稳定;金大4197次之,对37个菌种是抵抗的,9个菌种反映不稳定;燕交35368及燕大1885除了对5个碱草(Elymus chin-ense)条銹菌种抵抗外,对其他所有菌种的反应都是感染型。品种反应的不稳定,是鑒定工作中的主要困难。加根据早洋麦、农大3号、碧螞1号、碧螞4号、驪英3号、玉皮麦等6个品种的稳定反应加以分析,仅能將50个菌种中的21个区分成10个显著不同的类型。这6个品种对第一类型均为抵抗,对第二类型均为感染,其他类型的致病力介于二者之間。在这10个类型中,类型Y_2,Y_3,Y_4,Y_5,Y_6,Y_7,Y_8采自小麦;类型Y_9,Y_(10)采自Agropyron spp.;类型Y_1主要采自Elymuschinense(包括一个小麦菌种)。河北出現的类型有Y_1,Y_3,Y_4,Y_5,Y_7,Y_8,Y_9,...

1950年以来自华北以及少数其他地区搜集的条銹菌种,不論在Gassner和Straib所用的鑒定寄主或在国內推广品种上鑒定,都可区分出許多不同的类型。所用14个推广品种对于这些条绣菌种的抗病性有着很大的差別;其中以驪英1号最抗病,对50个菌种中的40个菌种是抵抗的,对7个菌种反应不稳定;金大4197次之,对37个菌种是抵抗的,9个菌种反映不稳定;燕交35368及燕大1885除了对5个碱草(Elymus chin-ense)条銹菌种抵抗外,对其他所有菌种的反应都是感染型。品种反应的不稳定,是鑒定工作中的主要困难。加根据早洋麦、农大3号、碧螞1号、碧螞4号、驪英3号、玉皮麦等6个品种的稳定反应加以分析,仅能將50个菌种中的21个区分成10个显著不同的类型。这6个品种对第一类型均为抵抗,对第二类型均为感染,其他类型的致病力介于二者之間。在这10个类型中,类型Y_2,Y_3,Y_4,Y_5,Y_6,Y_7,Y_8采自小麦;类型Y_9,Y_(10)采自Agropyron spp.;类型Y_1主要采自Elymuschinense(包括一个小麦菌种)。河北出現的类型有Y_1,Y_3,Y_4,Y_5,Y_7,Y_8,Y_9,Y_(10);山西出現有类型Y_1,Y_2,Y_6,Y_7;山东出現有类型Y_6。品种不稳定反应除通过选擇反应較为稳定的品种来克服外,同时还須严格掌握温室条件。如以品种的最高反应为标准(如方中达、陈迺用所采用),則可將上面50个菌种分成16个不同的类型。与华东的結果比較,許多品种如早洋麦、驪英1号等对兩个地区条銹病菌的反应适相反,表明华东和华北条锈菌的致病力可能有很大的差別。Elymus chinense的条銹菌与小麦条绣菌的致病力有極大差异,所测定的小麦品种对前者均抵抗。Elymus sibiricus和Agropyron spp.的条绣菌則能正常侵染多种小麦品种的幼苗。条銹菌在小麦叶片內能适当的扩展,較秆銹菌和叶銹菌更有系統性,單孢子接种約在二星期左右可蔓延到整个叶片。同一叶片上常出現抗病和感病的反应,用單孢及單孢菌系接种,得出同样結果。条绣菌的鑒定标准中除了原有的反应型外,还应加入混合型“X”一項。

To preliminarily purify rare earth raw matferiats, if the method of double salts of rare earth sodium sulphate is used, then the amount of Na_2SO_4:Re_2O_3=7:1 (gram-mole ratio) is suitable. By alkalizing and hydrolyzing the double salts, rare earth hydroxides can be obtained. The best conditions for oxidizing Ce(OH)_3 to Ce(OH_4 are as follows: if filtration of the hodroxides obtained from alkalizing and hydrolyzing the double salts with 12% NaOH solution (10% in excess) be carried out by properly heating the...

To preliminarily purify rare earth raw matferiats, if the method of double salts of rare earth sodium sulphate is used, then the amount of Na_2SO_4:Re_2O_3=7:1 (gram-mole ratio) is suitable. By alkalizing and hydrolyzing the double salts, rare earth hydroxides can be obtained. The best conditions for oxidizing Ce(OH)_3 to Ce(OH_4 are as follows: if filtration of the hodroxides obtained from alkalizing and hydrolyzing the double salts with 12% NaOH solution (10% in excess) be carried out by properly heating the mixture, the oxdation of Ce(Ⅲ) to Ce(Ⅳ) to the extent of 93% can be obtained. So long as the hydroxides are heated at 110℃ for 2-4hrs., it is eassy to carry through tae oxidation. At the same times, if the oxidation by general processes meet with certain obstacles, what is the best solution then? As for purity of Cerium dioride, if it is precipitated out of 65% concentrated nitric acid once, 96% purity can be reached. If twice, higher than 99% CeO_2 obtained The extent of recovery of cerium element from the dissolving rare earth raw material to the oxidation of rare earth hydroxides is 93%, and to the first purifica- tion from concd, nitric acid is 63%. Ifmother liquor of concd, nitric acid is uced repeated the percentage of recovery may be raised. From our experience, chloride ion has no bad effect on the oxidation of Ce(Ⅲ) to Ce(Ⅳ). This fact makes it posible to dissolve rare earth raw materials by using hydrochloric acid. What is more, to alkalize & hydrolyze the double salts of sulphate, it may be suitables to use caustic soda liquor fom electrolytic process. Volumetric methods for alkalizing cerium have been examined in detail.

稀土原料用硫酸复盐凈化,试验得Na_2So_4:RE_2O_3以7:1(克分子比)为适宜用量。复盐碱化水解成稀土氢氧化物后,试验得出将三价的氢氧化铈氧化成四价的氢氧化铈最良好的条件为:在用浓度为12%的NaoH溶液(过量10%)来碱化复盐时,如果在加热的情况下碱化水解,并趁热抽滤,卽有大部分三价铈氧化,氧化程度可达93%左右。随后只要在110℃烘干2-4小时氧化卽将继续进行到底。同时,尚试验得如果按一般经典手续来氧化时,由于某些不明原因氧化受阻碍时进行处理的方法。从原料溶解直至最后用浓硝酸法提纯氢氧化铈,一次提纯可得纯度为96%灼烧的CeO_2,两次提纯可得纯度近99%的灼烧CeO_2。至于铈的回收率,从原料溶解至氢氧化物氧化为止为93%,如果至第一次浓硝酸提纯止则总回收率为63%。如果母液循环用则总回收率将更高。本试验另得结果关于氯根对三价铈氧化成四价铈过程没有起不良影响。这就使原料的溶解可以采用盐酸,而碱化水解硫酸复盐时也有可能采用电解液碱。验证过分析铈的一些容量方法。

In this article, the wheel tractor is treated as a vibration system with two degrees of freedom. Using the solution of the differential equations of such a system, the characteristics of the free vibrations of tractor is analysed. The two partial frequencies ("constrained frequencies" )are suggested to be the fundamental critenia for wheel tractor riding quality. Some testing result of partial frequency are given, and a method of calculating forced vibrations in two typical cases is introduced, i e., when tractor...

In this article, the wheel tractor is treated as a vibration system with two degrees of freedom. Using the solution of the differential equations of such a system, the characteristics of the free vibrations of tractor is analysed. The two partial frequencies ("constrained frequencies" )are suggested to be the fundamental critenia for wheel tractor riding quality. Some testing result of partial frequency are given, and a method of calculating forced vibrations in two typical cases is introduced, i e., when tractor runs over a single obstacle and over continuous obstacles. The result of such calculation is compared with those obtained during experiments on turning disk testing stand. With the aid of this method of calculation, the influence of factors such as distribution of masses, tyre inflation pressure, front suspension and seat cushion on the vibration characteristics of both tractor and operator is discussed. Means of improving riding quality are also suggested.

本文首先把轮式拖拉机简化为两个自由度的振动系统,然后运用该系统振动微分方程的解,分析了机体自由振动的特点,提出把偏频作为评定轮式拖拉机平顺性的一个基本数据,并列举了偏频试验的结果。 文中在分析机体强迫振动时,建立了通过连续和单个不平度两种典型情况的计算方法,并与在转盘试验台上进行相应试验的结果加以比较验证,然后用该计算方法来讨论拖拉机机体质量分布、轮胎气压、前轴悬架、座椅等决定机体和拖拉机手振动的主要结构参数对振动的影响规律,提出改善轮式拖拉机平顺性的途径。

 
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