低碳钢焊缝的应力腐蚀和酸腐蚀

通过恒载荷实验研究了16MnR钢焊缝区在40％NaOH,110℃溶液中的应力腐蚀破裂行为，同时研究了酸洗对腐蚀断裂的作用。结果表明，根据极化曲线确定－980mV/SCE作为应力腐蚀敏感电位是合理的，在此电位下，16MnR焊缝区在40％NaOH,110℃溶液中仅用2天就出现了应力腐蚀裂纹，酸洗会引起裂纹加深加宽，导致断裂，可以从消除应力和选择合适的缓蚀剂两方面来防止氧化铝厂单管预热器破裂失效。     

反向凝固母带拉速对结晶器流场影响的数值模拟

在连续统一模型的基础上建立了描述反向凝固结晶器中的流动与传热的数学模型。利用有限差分方法，计算出了反向凝固结晶器中母带厚度的变化规律，随着母带在钢液中停留时间的增加，母带厚度初期迅速增长，中期平衡相持，后期快速回熔；并进一步研究了反向凝固母带拉速对结晶器中流场的影响情况，拉速较小时，紧贴母带的钢液随母带-同运动，对整个流场的影响不大，当拉速较大或拉速变化较大时，部分甚至整个流场都发生了变化。计算结果表明采用数值模拟求解结果与试验数据是吻合的，证明假设合理，模型正确。     

应力时效对P110套管螺纹参数的影响

在Φ339.7mmP110高强套管研制开发中发现,螺纹加工完成后因应力时效引起管体端头直径的变化,导致螺纹参数随之变化。通过对调质处理并矫直的套管几何尺寸及螺纹参数的测量试验,测试出随时间推移钢管几何尺寸、螺纹参数的变化量,分析其变化趋势及程度。通过应力时效对钢管形体作用的机理分析,提出确保套管螺纹参数稳定的控制措施。     

方坯连铸二冷热应力模拟

建立了方坯的应力计算模型，并通过采用有限元法求解，获得了铸坯在二冷段的应力和应变分布规律，为研究二冷对铸坯质量的影响提供了理论基础。     

PRB250/31.5乳化液泵曲轴结构的有限元--优化分析

本文以乳化液泵曲轴为研究对象，应用ANSYS5．7有限元软件，对整个曲轴进行有限元分析，旨在探索一种确定多拐曲轴的危险相位和危险点的方法，继而进行考虑圆角的疲劳强度分析，从而达到优化曲轴结构，提高泵的设计水平之目的。     

超声波法测量套管应力

根据超声波法测量材料应力原理，采用声速仪对套管进行了应力测量。试验结果表明，声速与套管的应力变化有较明确的对应关系，单轴应力的测量结果具有相当高的精度。该试验可为套损预测和套管超声应力检测仪的研制提供可靠的依据。     

Hydrogen embrittlement susceptibility and permeability of two ultra-high strength steels

Slow displacement rate tensile tests were carried out in a saturated H₂S solution to investigate the effect of hydrogen embrittlement on notched tensile strength (NTS) and fracture characteristics of two ultra-high strength steels (PH 13-8 Mo stainless steel and T-200 maraging steel). Hydrogen permeation properties were determined by an electrochemical permeation method. The results of permeation tests indicated that over-aged specimens showed a lower diffusivity/hydrogen flux and higher solubility than those solution-annealed. The great increase in reverted austenite (irreversible hydrogen traps) together with numerous precipitates at the expense of dislocations (reversible) in the over-aged specimen led to such a change in permeability. Ordinary tensile tests indicated that four tested specimens had roughly the same yield strength level. Hence, the hydrogen embrittlement susceptibility of the material could be related to their permeation properties. The uniform distribution of strong hydrogen traps in over-aged specimens instead of weak traps in the solution-annealed impeded the hydrogen transport toward the strained region, thus, the resistance to sulfide stress corrosion cracking was improved in over-aged specimens.     

Evolutionary circuit design for fast FPGA-based classification of network application protocols

The evolutionary design can produce fast and efficient implementations of digital circuits. It is shown in this paper how evolved circuits, optimized for the latency and area, can increase the throughput of a manually designed classifier of application protocols. The classifier is intended for high speed networks operating at 100 Gbps. Because a very low latency is the main design constraint, the classifier is constructed as a combinational circuit in a field programmable gate array (FPGA). The classification is performed using the first packet carrying the application payload. The improvements in latency (and area) obtained by Cartesian genetic programming are validated using a professional FPGA design tool. The quality of classification is evaluated by means of real network data. All results are compared with commonly used classifiers based on regular expressions describing application protocols.     

Multi-target tracking on confidence maps: An application to people tracking

We propose a generic online multi-target track-before-detect (MT-TBD) that is applicable on confidence maps used as observations. The proposed tracker is based on particle filtering and automatically initializes tracks. The main novelty is the inclusion of the target ID in the particle state, enabling the algorithm to deal with unknown and large number of targets. To overcome the problem of mixing IDs of targets close to each other, we propose a probabilistic model of target birth and death based on a Markov Random Field (MRF) applied to the particle IDs. Each particle ID is managed using the information carried by neighboring particles. The assignment of the IDs to the targets is performed using Mean-Shift clustering and supported by a Gaussian Mixture Model. We also show that the computational complexity of MT-TBD is proportional only to the number of particles. To compare our method with recent state-of-the-art works, we include a postprocessing stage suited for multi-person tracking. We validate the method on real-world and crowded scenarios, and demonstrate its robustness in scenes presenting different perspective views and targets very close to each other.     

现场总线在烘丝控制系统中的应用

系统采用现场总线完成过程控制,即可保证现场就地实时控制,又可以完成整线连锁控制,节约现场布线,降低成本,保证系统工艺控制精度和整线控制可靠性。