石方爆破施工控制技术探讨

以某高速公路石方爆破工程为例，介绍预裂爆破和光面爆破技术中爆破参数的选取，提出爆破施工方法及安全预防措施。     

一种实时轨道移频信号的检测方法

针对轨道移频信号的频谱特点，采用欠采样技术对轨道移频信号进行非整周期的采样，经过计算机仿真实验，验证了基于非整周期采样方法对轨道移频信号进行实时傅里叶变换（FFT）分析检测的可行性，证明采样方法满足检测指标的要求。同时对其频率分辨率和实时性进行了讨论。     

不同养生方式下的水稳材料关键力学性能试验研究

根据久马高速公路的情况,选取了PE薄膜密封养护、养护土工布覆盖滴灌节水保湿养护、可降解保湿膜养护三种常见养生方式,并辅以室内外养生作为环境条件。其中水稳材料的关键力学性能指标为无限制抗压强度、劈裂强度和回弹模量,按照要求进行检测和比较研究。结果显示,在核心技术指标即7 d力学性能试验中,PE薄膜和可降解保湿膜效果均表现优异,劈裂强度相差无几,相对而言土工布的方式的效果较差,在长期关键力学性能增长的过程中,可降解保湿膜效果均表现更为突出。说明可降解可降解保湿养生膜具有积极意义,一定程度上提升了水泥稳定碎石劈裂强度,同时这类塑膜还保持了可降解的特性,具备了较好环保特性,因此在有条件的情况下,环境脆弱或少水地区推荐采用可降解可降解保湿养生膜养生。     

MERGING AND SPLITTING SECOND-ORDER SELF-SIMILAR PROCESSES (TRAFFICS)

Recent traffic measurements in corporate LANs, Variable-Bit-Rate (VBR) video sources, ISDN control channels, and other communication systems, have indicated traffic behavior of self-similar nature, which has implications for design, control and analysis of high-speed networks. Merging and splitting are two basic networking operations. This paper gave the necessary and sufficient conditions for that merging of second-order self-similar traffic streams also results in a second-order self-similar stream. It shows that splitting traffic streams of the second-order self-similar stream are still self-similar streams by the independent splitting operation.     

CBTC移动闭塞信号系统拆分实施方案研究

因城市轨道交通的建设模式影响,后期规划需拆分线路情况屡见不鲜。详细论述在拆分线路中如何实现信号系统拆分的方案。     

New strategies for collision resolution of multi-access channel

ABSTRACT： The truncated binary exponential back-off algorithm is one of the most effective methods applied in collision resolution process of random multi-access channel. In this study, two new strategies are presented to improve the capability of the truncated binary exponential back-off algorithm. In the new strategies, the sizes of the initial window size or the operating window sizes are adjusted dynamically, which always bring a significant improvement for the self-adaptability of the original A series of experiments are simulated and the results verify that the new strategies can make the implementation more stable and effective than the original algorithm.     

交换机中报文三层转发的分布式处理研究与实现

随着芯片处理能力的迅速提高，交换机内部由报文转发机制所造成的瓶颈亟需解决。介绍了在华为新型（S6500系列）交换机上实现报文三层转发的分布式处理系统的原理，详述了分布式交换机对整机三层转发表的维护机制及ARP的分布式处理和表项同步机制。     

有机静电感应三极管（OSIT）静态工作特性的解析

在分析SIT器件电流一电压特性的理论基础上，对由有机半导体材料酞氰铜制作的有机SIT进行了静态特性的测试，通过对测试曲线进行数据拟合与解析，得出一系列OSIT在不同偏压条件下，电流-电压的表达式．数据解析结果表明，有机SIT器件的静态特性同无机SIT器件静态特性的理论分析基本相符。     

浅析DR67对耙吸挖泥船完整稳性的要求

入CCS级有允许耙吸挖泥船采用减小干舷的趋势,但是完整稳性要按照DR67决议计算.通过计算分析,探讨了DR67对完整稳性计算的要求,对这些要求应予以满足,也是当前国内耙吸式挖泥船设计在稳性计算中函待解决的问题.     

Brittle failure caused by lamellar splitting in a large-scale tubular joint with fatigue cracks

This paper reports a new incidence of brittle failure by lamellar splitting in a large-scale tubular X-joint and examines the possible causes of this failure. The X-joint, with multiple pre-existing fatigue cracks at the weld toe along the brace-to-chord intersection, experiences brittle failure during a monotonic in-plane bending test. Post-test sectioning of the material around the brace-to-chord intersection reveals lamellar splitting in the mid-thickness of the chord wall instead of rapid extensions of the fatigue cracks in the through-thickness direction. The lamellar splitting observed in this test differs from the conventional lamellar tearing both in its appearance and in its causes. The elongated nonmetallic inclusions concentrated at the mid-thickness, as revealed by the microscopic scanning, leads to delamination cracking near the mid-thickness and subsequently to the brittle failure of the joint. The material requirements in prevailing engineering codes do not suffice to prohibit the lamellar splitting failure observed in this study, which may cause catastrophic failures in engineering structures designed with insufficient redundancy.