就地冷再生技术在沥青路面养护中的应用

本文以沥青路面就地冷再生技术为主要研究内容,就其专用设备的使用情况进行深入探讨,使用能够实现其性能的专用试剂,并且根据国内外不同的设计方法进行合理的原料配比、性能指标和相关标准进行比较深入的分析.结合实际施工经验,总结出此项技术的施工经验,从而切实提高公路养护质量.     

解析农村公路建设中的环保问题

本文主要论述农村公路在建设过程中的环保问题,同时根据实践经验,针对具体问题提出解决方案,以供参考.     

蚌埠闸鱼道池室水力特性数值模拟

通过建立三维紊流数学模型,对隔板布置形式下的蚌埠闸鱼道池室水力特性进行计算,研究池室和休息池的水流流态、流速以及竖缝最大流速。特别针对典型池室和休息池上、中、下3个水层,20个横断面,920个测点。并对其中140个测点的横向、纵向和垂向流速进行了精细化分析。还研究了池室坡度对池室水力特性的影响。研究结果表明：1）鱼道池室和休息池上、中、下3个水层的流速、流态基本一致,水层越偏下主流流速相对越高;2）池室水流垂向流速很小,水流整体呈现二维特征;3）休息池主流流速与池室主流流速相当（平均值仅低3.5%）,但低流速区面积显著增大（54%）;4）池室坡度由1:100变缓至1:140,竖缝最大流速降低了16.9%;5）蚌埠闸鱼道池室坡度选为1:100~1:120可满足鱼类上溯需求。     

某重型驱动桥减壳与桥壳结合面密封失效分析

本文对重型驱动桥减壳与桥壳结合面密封方式进行简介,并明确了不同密封方式的优点和缺点,同时重点对密封胶密封失效问题进行讨论,并提出改进建议。     

Nickel Sulfide/Graphene/Carbon Nanotube Composites as Electrode Material for the Supercapacitor Application in the Sea Flashing Signal System

This work presents NiS/graphene/carbon nanotube （NiS/GNS/CNT） composites as electrode material for the supercapacitor application in sea flashing signal systems. NiS nanosheets were closely anchored on the conductive GNS-CNT networks. As a result, the NiS/GNS/CNT electrode showed a high specific capacitance of 2 377 F.g^-1 at 2 mV.s^-1 and good cycling stability compared with the pure NiS （1 599F.g^-1）. The enhanced electrochemical performances are attributed to the synergetic effect between the conductive carbon and the pseudo-capacitive NiS. The high performance supercapacitor may provide application in the sea flashing signal system.     

硫化氢对天然气管线内腐蚀的影响分析

在天然气集输过程中,H2S引起的管线内腐蚀问题普遍存在,往往导致管道发生严重局部减薄,甚至穿孔,引发事故。文中以某含S气田管件试样内腐蚀为例,对试样腐蚀产物形貌及成分进行了EDS与XRD分析,分析结果表明该试样具有典型的H2S腐蚀特征。揭示了影响H2S腐蚀的H2S分压、CO2分压等因素的影响机理。同时,指出H2S腐蚀机理复杂,影响因素众多,通常多种因素协同作用。     

慢行交通系统实践与设施规划研究

我国正处于机动化发展的快速时期,机动车保有量保持逐年递增趋势,交通拥堵、交通事故及严重违反交通安全的行为不断上升,慢行交通系统的研究正在逐渐受到公众的关注。文章对慢行交通系统组成及各自特点进行阐述,研究了慢行交通设施的规划设置方法,并提出了具体设计方案,为实现城市低碳交通及城市交通可持续发展提供新思路。     

New constructions of dynamic threshold cryptosystem

This study deals with the dynamic property of threshold cryptosystem. A dynamic threshold cryptosystem allows the sender to choose the authorized decryption group and the threshold value for each message dynamically. We first introduce an identity based dynamic threshold cryptosystem, and then use the Canetti- Halevi-Katz （CHK） transformation to transform it into a fully secure system in the traditional public key setting. Finally, the elegant dual system encryption technique is applied to constructing a fully secure dynamic threshold cryptosystem with adaptive security.     

Attribute-based signature on lattices

Attribute-based signature is a versatile class of digital signatures. In attribute-based signature, a signer obtains his private key corresponding to the set of his attributes from a trusted authority, and then he can sign a message with any predicate that is satisfied by his attributes set. Unfortunately, there does not exist an attribute- based signature which is resistance to the quantum attacks. This means we do not have secure attribute-based signature schemes in a post-quantum world. Based on this consideration, an attribute-based signature on lattices, which could resist quantum attacks, is proposed. This scheme employs ＂bonsai tree＂ techniques, and could be proved secure under the hardness assumption of small integer solution problem.     

采用耐久性指数对码头混凝土结构耐久性设计的评估

海洋环境中,因钢筋锈蚀导致混凝土结构耐久性下降的现象普遍存在。从码头结构设计、混凝土的材料和施工等方面对广西防城港旅游码头主体混凝土结构的耐久指数(Tp)进行分析计算,并结合结构所处的腐蚀环境的环境指数(Sp)对混凝土结构的腐蚀风险进行评估,结果表明:必须从码头结构设计、混凝土的原材料、混凝土和施工等方面严格控制,才可保证其50 a的耐久性设计使用年限。