重负荷导管舵桨空泡性能研究

该文以兼顾系柱大推力和航行速度为设计目标的推式导管舵桨为研究对象,采用RANS方法中的SST k-ω模型,选择Schnerr-Sauer空泡模式,考察航行和系柱工况下的空泡数值模拟结果,并与模型试验结果相比,得到的空泡形态大致与试验结果相符合,能够很好地捕捉到叶背片空泡、叶面空泡、梢涡空泡、梢隙空泡。因为吊柱与导管、导管桨的距离较近,出现了连体涡空泡现象,文中进一步分析了吊柱-导管桨距离与连体涡强度的关系,提出抑制连体涡空泡产生的距离（即距离大于0.35D,可基本消除连体涡空泡）,对基于空泡性能的导管舵桨优化设计提供了重要支撑。     

既有线增设线路所模式下的信号系统方案研究

新建黄大线岭庄线路所的信号设计方案证明通过灵活利用既有区间的轨道电路分割点,可以有效减少插入分歧道岔对该区间信号布点的广泛影响,避免轨旁信号设备的大范围迁改,进而显著节省投资成本.依托该行车和线路模式,从技术难点、人员配置和工程投资等方面分析独立联锁控制、纳入邻站直接控制、区域联锁控制这3种线路所联锁控制方式的优缺点.     

Face Hallucination with Weighted Nuclear Norm Constraint

Face hallucination via patch-pairs leaning based methods has been wildly used in the past several years. Some position-patch based face hallucination methods have been proposed to improve the representation power of image patch and obtain the optimal regressive weighted vector. The rationale behind the position-patch based face hallucination is the fact that human face is always highly structured and consequently positioned and it plays an increasingly important role in the reconstruction. However, in the existing position-patch based methods, the probe image patch is usually represented as a linear combination of the corresponding patches of some training images, and the reconstruction residual is usually measured using the vector norm such as 1-norm and 2-norm. Since the vector norms neglect two-dimensional structures inside the residual, the final reconstruction performance is not very satisfactory. To cope with this problem, we present a weighted nuclear-norm constrained sparse coding (WNCSC) model for position-patch based face hallucination. In addition, an efficient algorithm for the WNCSC is developed using the alternating direction method of multipliers (ADMM) and the method of augmented Lagrange multipliers (ALM). The advantages of the proposed model are twofold: in order to fully make use of low-rank structure information of the reconstruction residual, the weighted nuclear norm is applied to measure the residual matrix, which is able to alleviate the bias between input patches and training data, and it is more robust than the Euclidean distance (2-norm); the more flexible selection method for rank components can determine the optimal combination weights and adaptively choose the relevant and nearest hallucinated neighbors. Finally, experimental results prove that the proposed method outperforms the related state-of-the-art methods in both quantitative and visual comparisons.     

高速公路声屏障效果测试及设计方法的探讨

测试合界高速公路某段穿越居民区的声压级变化与声屏障的降噪效果。通过测试结果探讨声屏障效果的影响因素,并提出相应的设计方法。     

废旧轮胎复合型吸声屏障的研究与应用

利用废旧轮胎与水泥混凝土加压穿孔板两种主体材料研发出一种新型的复合吸声屏障,并从实验和理论上证实了该种声屏障在中、低频段吸声良好,平均吸声系数可达0.62,适合于公路交通噪声降噪需要。最后,对该种声屏障的安装结构进行了介绍。     

基于马尔可夫链的燃气管道外防腐层预测

介绍了埋地燃气管道外防腐层老化状况评价标准,以沥青外防腐层为例,通过应用马尔可夫链理论,阐述了基于逆阵的外防腐层老化状况预测的方法,从而为确定整条管线外防腐层老化状况分布提供了理论依据。     

大型客车采暖系统设计

介绍客车水暖系统热负荷的计算和几种管路系统的设计方法,通过对比得出最合理的方案。     

瓯江北口大桥钢桁梁悬吊方案及结构体系研究

瓯江北口大桥采用主跨2×800 m A型混凝土中塔钢桁梁悬索桥,为世界首次使用。为使该桥设计安全合理、造价经济、结构耐久,针对该桥的不同结构体系进行深入研究,通过对比4跨吊和2跨吊2种方案,择优选择了3塔4跨悬吊方案,针对加劲梁7种不同约束体系下的力学行为进行分析计算,确定了加劲梁的合理约束体系方案:1)加劲梁采用4跨连续体系,在中塔下横梁之间设置纵向系梁,其上设置单排竖向支座,边塔处类同; 2)加劲梁纵向采用全飘体系,仅在边塔的横梁上设有纵向液压阻尼装置; 3)在边塔柱及中塔柱侧壁钢桁梁上下弦处同时设置横向抗风支座。     

生成式人工智能对汽车产业的影响

近年来,生成式人工智能取得了显著突破,凭借其实用性、涌现性、灵活性等特点为汽车智能化发展带来新机遇。为理解生成式人工智能对汽车产业的影响,阐述了生成式人工智能技术的核心内涵,重点介绍当前先进的大模型技术,分析大模型在汽车领域的应用现状,并对其在汽车全生命周期中的应用趋势进行了展望;同时剖析了大模型在汽车领域的应用风险,探讨了针对大模型的政府监管问题。生成式人工智能在汽车领域具有巨大的应用潜力和价值,其在汽车领域的深度应用将催生汽车产业新业态,有助于汽车产业的高质量发展。