全文获取类型
收费全文 | 296篇 |
免费 | 5篇 |
专业分类
公路运输 | 97篇 |
综合类 | 83篇 |
水路运输 | 58篇 |
铁路运输 | 46篇 |
综合运输 | 17篇 |
出版年
2024年 | 1篇 |
2022年 | 4篇 |
2021年 | 15篇 |
2020年 | 6篇 |
2019年 | 1篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 7篇 |
2014年 | 11篇 |
2013年 | 17篇 |
2012年 | 18篇 |
2011年 | 16篇 |
2010年 | 12篇 |
2009年 | 21篇 |
2008年 | 31篇 |
2007年 | 29篇 |
2006年 | 31篇 |
2005年 | 25篇 |
2004年 | 3篇 |
2003年 | 7篇 |
2002年 | 11篇 |
2001年 | 4篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1994年 | 2篇 |
1992年 | 3篇 |
排序方式: 共有301条查询结果,搜索用时 46 毫秒
81.
82.
Transportation - A novel concept is presented to capture route choice behaviours and to account for the correlation of routes in the logit model. The issue that route choice models are easily... 相似文献
83.
84.
7月13日下午,在广州海事局二楼杨庆文事迹陈列馆,部海事局党组书记许如清在广东海事局党组书记刘恒伟、副书记杨文以及杨庆文妻子的陪同下,共同为杨庆文事迹陈列馆揭牌。 相似文献
85.
Multivariate hash functions are a type of hash functions whose compression function is explicitly defined as a sequence of multivariate equations. Billet et al designed the hash function MQ-HASH and Ding et al proposed a similar construction. In this paper, we analyze the security of multivariate hash functions and conclude that low degree multivariate functions such as MQ-HASH are neither pseudo-random nor unpredictable. There may be trivial collisions and fixed point attacks if the parameters of the compression ftmction have been chosen. And they are also not computation-resistance, which makes MAC forgery easily. 相似文献
86.
7月1日上午,广州海事局隆重召开纪念建党八十八周年表彰暨追认杨庆文为中国共产党党员大会。会上,广州市委组织部领导宣布了追认杨庆文为中国共产党党员的决定。 相似文献
87.
4250 TEU集装箱船舵空泡试验研究 总被引:1,自引:0,他引:1
大型集装箱船航速高,主机功率大,实船航运中半平衡舵上易产生由空泡引起的剥蚀危害。为改善这种状况,在船研所空泡水筒进行了4 250 TEU集装箱船舵空泡试验研究。观察操舵过程中舵空泡产生的情况,探讨降低舵剥蚀的方法,延长舵的有效使用年限。 相似文献
88.
针对区域路网交通分流技术中的分流路网优化与选择问题,分析了分流路网与基础路网的关系,确定了分流成本的构成与量化方法,在此基础上提出了以分流成本最小化为上层目标、以用户均衡为下层目标的区域交通分流路网设计的双层优化模型,进而给出了考虑路网拓扑结构完整性和反Braess假定的模型启发式求解方法,并对算法的效率进行了分析.最... 相似文献
89.
Breakup modeling of a liquid jet in cross flow 总被引:3,自引:0,他引:3
K. -S. Im K. -C. Lin M. -C. Lai M. S. Chon 《International Journal of Automotive Technology》2011,12(4):489-496
We propose a novel breakup model to simulate the catastrophic breakup regime in a supersonic cross flow. A developed model
has been extended from an existing Kelvin-Helmholtz/Rayleigh-Taylor (K-H/R-T) hybrid model. A new mass reduction rate equation,
which has critical effects on overall spray structure, is successfully adopted, and the breakup length, which is an important
parameter in existing model, is replaced by the breakup initiation time. Measured data from the supersonic wind tunnel with
a dimension of 762×152×127 mm was employed to validate the newly developed breakup model. A nonaerated injector with an orifice
diameter of 0.5 mm is used to inject water into a supersonic flow prescribed by the momentum flux ratio of the liquid jet
to free stream air, q
0
. The conservation-element and solution-element (CE/SE) method, a novel numerical framework for the general conservation law,
is applied to simulate the supersonic compressible flow. The spray penetration height and average droplet size along with
a spray penetration axis are quantitatively compared with data. The shock train flow structures induced by the presence of
a liquid jet are further discussed. 相似文献
90.
HAVAL is a hash function proposed by Zheng et al. in 1992, including 3-, 4- and 5-pass versions. We improve pseudo-preimage
and preimage attacks on 3-pass HAVAL at the complexity of 2172 and 2209.6, respectively, as compared to the previous best known results: 2192 and 2225 by Sasaki et al. in 2008. We extend the skip interval for partial-patching and apply the initial structure technique to find
the better message chunks, and combine the indirect-partial-matching, partial-fixing and multi-neutral-word partial-fixing
techniques to improve the attacks based on the meet-in-the-middle method. These are the best pseudo-preimage and preimage
attacks on 3-pass HAVAL. 相似文献