大新高速公路沥青路面裂缝诊断与处治

利用现代检测手段对沥青路面出现的各种裂缝进行科学的诊断,并运用现代理论进行科学分析得出准确的结论并形成推荐处治方案。     

钢铝混合车身前处理关键技术研究

传统磷化工艺对钢铝混合处理的能力存在一定不足,比如工作液沉渣量大,成膜效果欠佳,为后续涂装带来漆膜颗粒、性能下降等不良影响。为解决上述问题,以不同的钢铝面积比分别进行沉渣量、膜重、微观形貌等试验,以及对前处理关键设备进行了对比研究。通过分析试验结果,得出钢铝面积比不同会导致沉渣量和成膜效果的差异,找出了适用于不同的铝合金面积比的前处理工艺,为钢铝混合车身的涂装线建设提供技术支持。     

气动振动器在预应力混凝土T梁预制中的应用

气动振动器主要适用于大型混凝土构件的预制,如公路、铁路、大坝、桥用大梁,以及涵洞、地铁、隧道混凝土的构筑.针对目前国内外振动器在大型混凝土构件预制应用中的实际情况,结合我国预应力混凝土T梁预制的工艺特性,阐述气动振动器在预应力混凝土T梁预制中的应用.     

超滤膜提取当归补血汤对荷瘤小鼠脾细胞IL-2和IFN-γ的诱生作用

目的 观察超滤膜提取当归补血汤对荷瘤小鼠脾细胞白细胞介素-2(IL-2)和γ-干扰素(IFN-7)的诱生作用,探讨其对荷瘤小鼠免疫系统的调节机制.方法 采用超滤膜分离技术提取当归补血汤,用双抗体夹心ELISA法检测培养脾淋巴细胞上清液中IL-2和IFN-γ的含量,用反转录一聚合酶链式反应(RT-PCR)法测定脾淋巴细胞IL-2和IFN-γmRNA的表达水平.结果 超滤膜提取当归补血汤各剂量组小鼠脾淋巴细胞培养上清液中IL-2和IFN一γ的含量均较模型组增高,大剂量组与模型组比较有显著性差异(P＜O.05).各剂量组小鼠脾淋巴细胞IL-2和IFN一γ mRNA的表达水平均增高,中剂量组和大剂量组与模型组比较,均有显著性差异(P＜O.05).结论 超滤膜提取当归补血汤能够促进荷瘤小鼠脾淋巴细胞细胞因子IL-2和IFN-γ的分泌及其mRNA的表达,从而发挥免疫调节作用.     

中机公司：缔造中国外贸神话——访中国机械进出口（集团）有限公司副总裁赵军先生

“莫道风景真奇绝，成如容易却艰辛”。用这句话形容中国机械进出口（集团）有限公司（以下简称“中机公司”）的发展历程实不为过。 成立于1950年的中机公司，是中国成立最早的以经营机电产品进出口贸易和国际工程承包业务为主的大型国有外贸企业，现为国有重要骨干企业——中国通用技术（集团）控股有限责任公司的全资子公司。50多年来，中机公司累计进出口贸易总额逾85O亿美元，主要进口产品有机床和锻压设备，航空和交通运输机械、农业机械、电力机械、电工设备、矿山机械，冶金机械、通用机械等上千个品种，进口国分布在五大洲的59个国家和地区。主要出口产品有大中型成套设备和技术项目、船舶、铁路机车车辆，出口国分布在五大洲的156个国家和地区，取得了世人瞩目的业绩，在中国机电外贸行业中始终发挥着主渠道作用。     

Evaluating the feasibility of a passive travel survey collection in a complex urban environment: Lessons learned from the New York City case study

The combination of increasing challenges in administering household travel surveys and advances in global positioning systems (GPS)/geographic information systems (GIS) technologies motivated this project. It tests the feasibility of using a passive travel data collection methodology in a complex urban environment, by developing GIS algorithms to automatically detect travel modes and trip purposes. The study was conducted in New York City where the multi-dimensional challenges include urban canyon effects, an extreme dense and diverse set of land use patterns, and a complex transit network. Our study uses a multi-modal transportation network, a set of rules to achieve both complexity and flexibility for travel mode detection, and develops procedures and models for trip end clustering and trip purpose prediction. The study results are promising, reporting success rates ranging from 60% to 95%, suggesting that in the future, conventional self-reported travel surveys may be supplemented, or even replaced, by passive data collection methods.     

In situ absorption and metabolism of stilbene glycoside in rat

Stilbene glycoside (TSG) has been shown to have many beneficial properties. It is therefore essential to understand the absorption and metabolism of TSG in detail. We determined the recovery of TSG and its metabolites (TSG sulfate/glucuronides) in rat gastric contents, gastric mucosa, portal vein plasma, celiac arterial plasma, bile, and urine after administration of 15mg of TSG in 0.5mL physiological saline or incubation for 20min in situ in the stomach of rats. Within 20min, (64.0±9.8)% of the administered TSG disappeared from the stomach; later, TSG was recovered in both free and conjugated forms in plasma and bile, but not in urine. On the other hand, only free TSG was detected in the gastric contents and mucosa; it was also detected in the portal vein plasma as (48.1±3.5)% of the total TSG (all forms of TSG). However, the proportion of free TSG in the celiac arterial plasma and bile decreased to 4%-10%. In addition, the proportion of free TSG to total TSG in the liver microsome incubation mixture after TSG was incubated in liver microsome at 37℃ for 30min was very low [(10.6 ± 2.6)%]. These results indicate that TSG could be quickly absorbed from the rat stomach, conjugated in liver and excreted in bile. Such novel information would be helpful for the use of TSG as a beneficial natural product which may improve its proposed efficacy in preventing chronic diseases.     

动车组转向架构架的有限元分析及虚拟装配实现

利用I-DEAS和3ds MAX软件对某型号动车组转向架构架进行三维实体建模、虚拟装配动画演示,应用有限元方法对转向架的构架结构及载荷性能进行了研究,计算结果表明其强度满足设计要求。     

浅谈钩尾扁销的裂损折断原因及对策

分析了提速后货车钩尾扁销裂损折断的原因，提出了改进措施，以确保列车的安全运行。     

满足欧洲Ⅰ排放法规的车用直喷式柴油机燃烧系统的研究

本文针对自然吸气式车用6110直喷式柴油机,对燃油喷射系统、燃烧室形状、进气涡流比和机械离心喷油提前规律进行优化匹配研究,获得了满足欧洲Ⅰ排放法规的燃烧系统参数。