海水珍珠分泌细胞在白云岩表面的沉积序列

采用“平板珍珠”研究方法,将白云岩平板插入和固定在马氏珠母贝Pinctadamartcnsij（Dunkcr）的内表面,获得不同阶段的平板珍珠、采用扫描电子显徽镜观察在平板珍珠形成过程中沉积序列,旨在阐明海水珍珠的形成机理。为开发新型珠核材料提供理论指导。     

基于模糊失效准则的生土窑居可靠度分析

为揭示生土窑居在役百年或数百年的深层次原因,分析了其在模糊失效准则下的可靠性.基于强度折减法,建立生土窑居的基本失效判据,用模糊区间、隶属函数表征失效准则的模糊性,用不含交叉项的二次多项式响应面函数代表生土窑居的功能函数,在不同的随机变量组合下进行可靠度分析.对河南三门峡陕县的生土窑居的模糊可靠度进行了分析,表明该地区生土窑居可靠性较高,黄土较高的粘聚力是营造生土窑居的天然有利条件,窑腿宽度对其可靠性有着重要的影响.     

37Mn5钢圆坯纵裂原因与对策

37Mn5钢圆坯常用于生产石油管钢,这种材质的石油套管是石油钻探用重要器材,属裂纹敏感性钢种,在连铸生产中易在铸坯表面产生纵裂.阐明了37Mn5钢在连铸生产中产生纵裂的主要原因,并综述了目前控制纵裂产生的具体措施,重点强调了协调好保护渣各项理化性能才是抑制37Mn5钢表面纵裂的关键.     

基于Pro/E的真空式搅拌粉碎机的结构设计

利用Pro/E作为设计工具,将真空技术与粉碎技术相结合,设计了真空式搅拌-粉碎机.通过设计计算,获得了主要结构参数.     

A new early cretaceous dinosaur track assemblage and the first definite non-avian theropod swim trackway from China

The trackway of a swimming theropod (ichnogenus Characichnos) is reported from the Lower Cretaceous Feitianshan Formation of Sichuan, China. These swim tracks help confirm that non-avian theropods were capable of forging moderately deep bodies of water. The trackway occurs on the same surface as a typical walking trackway of a sauropod (ichnogenus Brontopodus). Both occurrences are the first reported from the Cretaceous of Sichuan, and the swim tracks are the first well-preserved example of a Characichnos trackway from China. Additionally, a theropod walking trackway and several ornithopod walking trackways (similar to the ichnogenus Caririchnium) occur in the same horizon. The ornithopod trackways show a parallel orientation, suggesting gregarious behavior of the trackmakers, which may have been iguanodontiforms and/or hadrosauriforms. The co-occurrence of theropod swim tracks and theropod walking tracks suggests a fluctuation of water depth within a distinct time span.     

Analysis of variation trends and causes of aerosol optical depth in Shaanxi Province using MODIS data

The temporal and spatial variations and causes of aerosol optical depth （AOD） in Shaanxi Province were investigated based on the Moderate Resolution Imaging Spectroradiometer （MODIS） derived aerosol data for the period of March 2000-February 2012. The results showed that the distribution of aerosol was largely affected by topography and local economic activities. Heavy aero- sol loading and increasing tendency in AOD was observed in Guanzhong, Hanzhong and Ankang basin, while a reverse tendency was revealed in most other regions. The spatial distribution of aerosol Angstrom wavelength exponent was predominantly related to vegetation coverage in Shaanxi. Airborne dust from ground is an important source of coarse mode aerosols. Vegetation im- provement indicated by an increase in normalized difference vegetation index （NDVI） and a reduction in dust weather led to a gradual decrease in coarse mode AOD to the north of Qinling Mountains in Shaanxi, while anthropogenic activities led to an in- crease in fine mode AOD in other areas except those covered by forests. The main aerosol type gradually shifted to the urban industrial type in Shaanxi.     

黑潮区颗粒有机碳和生物硅输出的^234Th／^238U不平衡示踪

对东海陆架外黑潮区颗粒有机碳（POC）和生物硅（bSiO2）的研究表明：台湾东北部黑潮主流真光层（100m）POC和bSi02的平均浓度分别为3．31μmol／L和0．68μmol／L;^234Th／^238U不平衡法获得POC和bSi02的输出通量分别为3．7mmol／（m^2·d）和1．6mmol／（m^2·d）．黑潮沿东海陆架北进过程中,POC和bSiO2的含量及输出通量均呈增加趋势．位于日本西南的黑潮主流中,POC和bSiO2的平均浓度分别为3．85μmol／L和2．63μmol／L,输出通量分别为6．7mmol／（m^2·d）和4．0mmol／（m^2·d）．黑潮与陆架水形成的锋面区,POC和bSiO2浓度均高于黑潮主流．     

厨房内吸油烟机射流气幕的参数化研究

针对带有射流气幕和整流板的家用吸油烟机,采用正交试验方法,分别研究了射流速度、射流角度、射流孔宽度、整流板面积和吸油烟机风量对吸油烟机性能及其厨房内环境的影响,最终获得了能够有效控制油烟和热空气逃逸的吸油烟机气幕设计参数。结果表明:吸油烟机风量对厨房内油烟浓度和温度有重要的影响,当吸油烟机风量为10.5m3/min、整流板面积为0.22m2、射流速度为1.5m/s、射流角度为-5°、射流孔宽度为4mm时,厨房内人体舒适度最佳。     

方格星虫多糖抗菌和抗氧化活性研究

通过比较水提和碱提方格星虫粗多糖的抗菌和抗氧化活性,探讨这两种方法在方格星虫粗多糖提取中的优劣.结果,水提粗多糖对副溶血弧菌（Vib rio parahemol yticus）不敏感,对枯草芽孢杆菌（Bacillus subtilis）中度敏感,对其它细菌均为低敏感;碱提粗多糖对大肠杆菌（Escherichia coli）、金黄色葡萄球菌（Staphylococcus aures）和鳗弧菌（Vibrio an guillarum）低敏感,对白葡萄球菌（Staphylococcus cremoris）和副溶血弧菌中度敏感,对枯草芽孢杆菌和藤黄八叠球菌（Sarcina lutea）高度敏感.表明,碱提粗多糖的抗菌活性较水提粗多糖强.两种方法提取的方格星虫粗多糖均有一定的抗氧化性.水提和碱提多糖浓度均在800μg·mL-1时对羟自由基的清除能力最大,清除率分别为40.32％和39.86％;两种多糖浓度分别在800μg·mL-1和600μg· mL-1时对超氧自由基的抑制作用最大,抑制率分别为9.91％和5.86％.表明,水提方格星虫粗多糖的抗氧化性强于碱提粗多糖.