δ—Al2O3f／Al合金基复合材料的强度研究

对挤压铸造法制得的δ－Ａｌ２Ｏ３ｆ／Ａｌ合金基复合材料，测量其短纤维地位向分布，导出了一个位向分布密度函数。在此基础上考虑在体抗拉强度高低和不同界面结合的影响，对复合材料的拉伸强度进行了预测，预测结果和实测值符合较好     

Transforaminal lumbar interbody fusion for traumatic lumbar spondylolisthesis

To evaluate the clinical outcome, effectiveness and safety of the surgical management of traumatic lumbar spondylolisthesis with transforaminal lumbar interbody fusion (TLIF) with short segmental instrumentation fixation. A retrospective review of a consecutive series of 24 patients with traumatic lumbar spondylolisthesis treated with TLIF procedure was carried out. Intraoperative spinal cord monitoring was used to confirm the peripheral neural function intact during the reduction of the spondylolisthesis. Preoperative clinical and radiographic evaluation of all cases were originally collected prospectively. Data regarding blood loss, operative time, duration of hospital stay, radiographic fusion, instrumentation failure and clinical result were collected and observed at regular follow-up periods. All patients were engaged in high-energy accidents in the lower back and 16 patients had concomitant injuries. The mean operative time was 124 min, mean blood loss was 350 mL, and mean hospital stay was 6.5 days. There were no complications such as incision infection, cerebrospinal fluide (CSF) leakage and nerve root injury and so on. All patients demonstrated a solid lumbar interbody fusion within 4 months, and no evidence of spondylolisthesis correction loss, instrumentation failure and loosing. They all were completely asymptomatic, with normal neurologic findings, and had resumed their previous level of physical activities on the final follow-up. Meticulous clinical examination and careful imaging assessment could assist an early diagonosis in cases of traumatic lumbar spondylolisthesis. Performing open reduction and the TLIF procedure as soon as possible could restore segmental stability and painless function. The TLIF procedure was a safe, effective technique to treat traumatic lumbar spondylolisthesis.     

Face recognition via adaptive image combination

Dimension reduction and manifold learning are the two most popular feature extraction methods. The two methods focus on spatial locality as a guiding principle to find a low-dimensional basis for describing high-dimensional data, but no bases or features are more spatially localized than the original image pixels. So, adaptive image combination is presented to represent a class by a combined sample. The combined sample is a linear combination of original samples in the same class. Adaptive image combination (AIC) find the best combination coefficients by minimizing the intrapersonal distance and maximizing the interpersonal distance. Experimental results show that AIC is effective.     

Parameter transfer of common-metric attributes in choice analysis: implications for willingness to pay

There is a growing literature that promotes the presence of a mix of compensatory and semi-compensatory processing strategies in the way that individuals evaluate packages of attributes in real or hypothetical markets, and make choices. This paper proposes a specification for the utility form in a choice model to test if, given a pair of attributes with a common-metric (e.g., components of travel time or cost), the attribute with the dominating level defines the marginal (dis)utility that is assigned to both attributes. We refer to this processing strategy as a parameter transfer rule. We use a stated choice data set, in the context of car driving individuals choosing between tolled and non-tolled routes, to estimate a mixed logit model which incorporates the presence of the parameter transfer rule and the conventional fully compensatory rule, both existing up to a probability. We find that if this parameter transfer heuristic is part of the mix, the WTP is more than 30% higher, on average, than when only a fully compensatory rule is imposed. We also contrast the parameter transfer rule with other semi-compensatory heuristics which have been investigated in other papers, and show that the finding adds further support to the accumulating evidence that a semi-compensatory attribute processing rules tend to result in higher mean WTP estimates compared to the fully compensatory attribute processing rule.     

上海丹巴路大挑臂的朝阳河桥设计

上海丹巴路朝阳河桥是跨越朝阳河的一座大挑臂三跨连续箱梁桥。该文重点介绍了该桥的上下部结构设计和计算分析,以及关键点的处理。其成果为今后类似桥梁的设计提供了一些有价值的技术资料和思路。     

晚期直肠癌的姑息疗法

应用肠腔及痔上动脉化疗药物灌注后用TH胶堵塞痔上动脉,结扎双侧髂内动脉以阻断肿瘤组织的血供,治疗17例晚期直肠癌。经1年～7年随诊,对照观察表明:76.4%自觉症状好转,23.5%减轻,82.3%自我生活能力提高,88.2%粘液分泌及出血减少,原发灶生长趋于缓慢,病理显示细胞退形性变,癌细胞结构模糊,核仁不清,细胞萎缩,间隙增大,周围组织水样变性,生存期较单纯造瘘组延长2年左右。     

铁路道岔钢轨压型段超声波探伤

通过道岔钢轨压型段超声波探伤试验，确定了钢轨压型段超声波探伤的检验方法、检验部位、验收要求等；将试验结果应用到道岔的制作中，取得了满意的效果，达到了预期目标；完善了TB／T412-2004《标准轨距铁路道岔技术条件》中对道岔钢轨压型段无损探伤的规定。     

关于北京站扩能改造工程总体设计若干问题的研究

论述北京站扩能改造工程总体规划思路、无站台柱雨棚设计形式、地下行包库设置位置、站台限界的调整等若干问题 ,并提出大型客站新建及改造有关情况的见解     

基于ANSYS/LS-DYNA软件的水下钻孔爆破数值模拟

结合ANSYS/LS-DYNA对水下钻孔爆破进行数值模拟分析,建立水介质轴向不耦合和空气轴向不耦合单孔钻孔爆破模型,对岩石爆破破碎机理进行研究。通过数值模拟进一步验证了水介质不耦合装药结构较空气不耦合装药结构爆破的优越性,能量利用率得到较大提高,同时得到了在水介质不耦合状态下的最佳水下钻孔爆破装药结构形式。对于航道整治、港口码头建设中涉及水下炸礁工程应用具有一定的参考价值。     

全球联合开发汽车项目管理研究

结合项目管理的理论,通过对全球联合开发汽车项目管理的流程、关键工作和跨国文化差异问题的研究,以期能给中国汽车企业的全球联合开发提供参考.