Dependence of Lamellar Eutectic Growth with Convection on Boundary Conditions and Geometric Confinement: A Phase-Field Lattice-Boltzmann Study

Metallurgical and Materials Transactions B - Simulating eutectic growth with convection is challenging because of the enormous computing demand resulting from the required domain size compared with...     

基于GIS的雷达远程显示系统的设计与实现

将GIS应用在雷达远程显示系统中。运用组件式GIS开发模式,设计了具有串行数据通信、网络数据通信、目标数据定位、属性查询、地理分析等功能的GIS应用软件。系统的研制打破了传统雷达信息显示方式的局限性,实现了雷达信息与GIS的有机结合,给指挥人员的决策带来极大的方便。     

The mitochondrial genome from the thermal dimorphic fungus Paracoccidioides brasiliensis

We present here the sequence of the mitochondrial DNA of the pathogenic thermodimorphic fungus Paracoccidioides brasiliensis, agent of an endemic disease in most South American countries. The sequenced genome has 71 334 bp and is organized as a circular molecule with two gaps of unknown size flanking the middle exon of the nad5 gene. We located genes coding for the three subunits of the ATP synthase (atp6, atp8 and atp9), the apocytochrome b (cob), three subunits of the cytochrome c oxidase enzyme complex (cox1, cox2 and cox3), seven subunits of the reduced nicotinamide adenine dinucleotide ubiquinone oxidoreductase (nad1, nad2, nad3, nad4, nad5, nad6 and nad4L) and the large (rnl) and small (rns) subunits of ribosomal RNA. Two maturases and a ribosomal protein (rms5) are located inside introns. Twenty-five tRNAs were identified with acceptors for all 20 amino acids. Seven polypurine/polypyrimidine tracts (140-240 bp) have been found in this genome. All genes are in the same orientation over the genome, while their order is closest to the mitochondrial genomes from Penicillium marneffei and Aspergillus nidulans.     

Optimization of alcohol‐free beer production by lager and cachaça yeast strains using response surface methodology

Alcohol‐free beers (AFBs) are an attractive segment of the beer market both for the brewing industry and for consumers. While AFBs produced by arrested/limited fermentation often suffer from a lack of volatile compounds, beer flavour can be improved by yeast selection and optimization of fermentation conditions. The yeast selection strategy was demonstrated by comparing traditional lager yeast with selected cachaça yeast strains. Correspondingly, response surface methodology was used to enhance the formation of the flavour‐active volatile compounds by optimization of the fermentation conditions (original wort extract, fermentation temperature, pitching rate). Statistical analysis of the experimental data revealed the relative significance of process variables and their interactions. The developed quadratic model describing the responses of total esters and higher alcohols to changes in process variables was used to predict the ideal fermentation conditions in terms of flavour formation. The predicted conditions were experimentally verified and alternative strategies of AFB production are suggested. Copyright © 2016 The Institute of Brewing & Distilling     

蒲公英抑菌物质的提取工艺研究

以大肠杆菌、沙门氏菌为供试菌种,对蒲公英抑菌活性物质的提取工艺进行优化,结果表明:以湖北产蒲公英为原料,以70%醇为提取剂,提取温度为100℃,提取时间为2.5h,料液比为1/25(m/V).在最佳工艺条件下蒲公英抑菌活性物质的提取率可达19.97%,而抑菌圈直径大肠杆菌可达13.15mm,沙门氏菌为18.74mm.     

灰色关联分析和多元二次非线性回归分析模型研究及应用

基于大庆油田采油二厂压裂措施资料,运用灰色关联分析方法选取对裂缝导流能力影响较大的因素,然后运用多元二次回归分析做进一步的定量研究,并与DPS系统的分析结果进行对比。结果表明,灰色关联分析可以较好的得到与裂缝导流能力关系密切的因素,回归分析可以得出因素间的具体定量关系,且回归分析计算的精度较高,多元二次回归分析和DPS平均拟合误差分别为0.940%、0.916%,预测平均误差分别为1.850%、1.831%,研究为油田开发动态数据规律研究提供了有效的方法。     

铝硅准二元玻璃硬度和抗碎裂性演化的结构起源

为探究准二元铝硅玻璃硬度和抗碎裂性随组分变化的结构起源,采用激光加热气动悬浮技术,制备了组分为xAl2O3·(100–x)SiO2(30≤x≤63,摩尔分数)的系列玻璃样品.利用显微维氏硬度仪对玻璃的硬度、抗碎裂性进行了详细表征.结果表明:随着Al2O3含量增加,玻璃硬度逐渐升高,于x=63时硬度最大(8.94 GPa...     

《青岛建筑工程学院学报》论文的引文分析

本文对《青岛建筑工程学院学报》创刊十年间(1980～1989年底)总计刊载的274篇文献所著录的1169条引文,分别按引文的数量、语种、类型、年代和自引量等进行了统计,从中寻找出我院学报论文引文的一般规律,是我院学报十年发展的一次初步评价。     

大深度超大直径盾构盾尾受力性能探究

考虑盾尾壳体的初始几何缺陷及中空层合板构造,对超大直径(D14.0 m)盾构的盾尾在大深度水土压力下的力学性能进行建模分析。分别建立理想圆壳、缺陷圆壳、理想层合板和缺陷层合板4种结构分析模型,基于有限元计算,对4种模型的结果进行分析。对比发现:缺陷层合板模型在极限承载情况下最大变形为18.8 mm,最大等效应力达304 MPa,远超过理想圆壳模型的最大变形(3.6 mm)和最大等效应力(71.6 MPa),说明盾尾局部区域已发生塑性变形。因此,在超大直径盾构的盾尾设计时应考虑初始几何缺陷和中空层合板构造对盾尾变形和应力的放大效应。