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141.
针对基于西门子S7 200 PLC为核心控制单元开发的船舶操舵仪模拟器中罗经复示仪,提出了采用永磁式直流电机进行驱动及控制的解决方案,并讲述了电机的速度和转向的具体控制方法。 相似文献
142.
华夏 《青岛远洋船员学院学报》2006,27(4):31-35
本文论述了无纸化考试较之传统的纸面考试的优越性。阐述了无纸化考试的设计思想,B船站考核、评估和记录系统的总体设计、编程方法及分析了编程中所涉及的相关技术。 相似文献
143.
GMDSS模拟器实现语音通信的设计 总被引:1,自引:0,他引:1
阐述了GMDSS模拟器实现语音通信的必要性,结合A型船站、SSB无线电话和VHF无线电话话音通信的实际过程,描述了在VC++环境下,采用socket通信和多线程等技术开发基于UDP协议的点对点和点对面语音通信程序的方法,着重剖析了其中的主要模块,即语音数据采集、语音数据的发送和接收。 相似文献
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在介绍船舶操纵训练系统视景的体系结构基础上,提出视景多通道同步的要求及其技术实现,采用多线程的结构以及推算定位等技术实现多通道同步,使通道帧数差在2帧以内,各通道的产生的画面就感觉是同一时刻、同一视点产生的。 相似文献
146.
Yusuke Tahara Robert V. Wilson Pablo M. Carrica Frederick Stern 《Journal of Marine Science and Technology》2006,11(4):209-228
Steady flow simulations for the Korean Research Institute for Ships and Ocean Engineering (KRISO) container ship (KCS) were
performed for towing and self-propulsion. The main focus in the present article is on the evaluation of computational fluid
dynamics (CFD) as a tool for hull form design along with application of state-of-the-art technology in the flow simulations.
Two Reynolds-averaged Navier-Stokes (RANS) equation solvers were employed, namely CFDShip-Iowa version 4 and Flowpack version
2004e, for the towing and self-propulsion cases, respectively. The new features of CFDShip-Iowa version 4 include a single-phase
level-set method to model the free surface and an overset gridding capability to increase resolution in the flow and wave
fields. The new features of Flowpack version 2004e are related to a self-propulsion scheme in which the RANS solver is coupled
with a propeller performance program based on the infinitely bladed propeller theory. The present work is based on a close
interaction between IIHR-Hydroscience and Engineering of the University of Iowa and Osaka Prefecture University. In the following
article, overviews are given of the present numerical methods and results are presented and discussed for the KCS in towing
and self-propulsion modes, including comparison with available experimental fluid dynamics (EFD) data. Additional evaluation
is provided through discussion of the recent CFD Workshop Tokyo 2005, where both methods appeared to yield very promising
results. 相似文献
147.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1075-1093
A paired comparison experiment using 23 subjects was run on the VIRTTEX driving simulator to compare a lane position based motion drive algorithm (MDA) with a classical MDA for a highway speed, lane change manoeuvre. Two different tuning states of the lane position algorithm and four different tuning states for the classical algorithm were tested. The subjective fidelity of the six different motion cases was compared with each other and a Bradley–Terry model was fit to find the fidelity merit of each case. In addition, the driving performance of the subjects for six motion cases was recorded and compared. The motion-tuning cases were selected such that the trade-off in motion quality between overall motion scaling and motion shape distortion (shape-error), as well as the trade-off between lateral specific force and roll-rate motion errors, could be studied. It was found that when the overall scaling is the same, drivers perform better with the lane position algorithm than with the the classical algorithm. A well-tuned, manoeuvre-specific, classical MDA, however, did achieve a subjective fidelity level on a par with the lane position MDA. A generically tuned classical MDA, however, has a significantly reduced fidelity and driving performance when compared with a lane position algorithm with the same scale factor. A strong trade-off between motion shape-errors and overall motion scaling was found. A small increase in motion cue shape-error, combined with an increase in the scale factor from 0.3 to 0.5, led to improved performance and increased subjective fidelity. The results of the experiment also suggest that simulator motion can be improved by reducing the angular-rate shape-error at the expense of the specific force shape-error (while keeping the total normalised shape-error constant). 相似文献
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应用模拟器对港航工程进行仿真,得到在模拟环境下船舶航行及靠离泊相关数据.分析国内进行通航安全评估模拟试验的现状和不足.探讨制作精确的水域电子海图,设计船舶模型和仿真水流、潮汐、海浪,建立模拟地区三维视景模型,优化模拟试验方案,提高仿真模拟精度. 相似文献