同城化背景下金沙洲地区的发展研究

在广佛同城化背景下,广州“西联”战略得到了进一步的强调,广州西部板块开始崛起。广佛交界地区的发展必须审时度势,才能占领区域发展的制高点。本文以金沙洲地区为例,分析在广佛同城化背景下面临机遇与挑战,剖析金沙洲地区的现状与问题,提出金沙洲地区提升发展的目标与策略。     

沉积环境和层序地层对次生孔隙发育的影响——以川中地区须家河组碎屑岩储集层为例

从受沉积环境控制的骨架颗粒粒度、成分成熟度、结构成熟度、自生矿物的析出和溶蚀等方面出发,将成岩学与层序地层学结合,研究四川盆地川中地区须家河组储集层次生孔隙发育程度的影响因素。研究认为,沉积环境和层序地层格架对次生孔隙的发育有重要的影响,在水动力强、砂岩成分成熟度较高的沉积环境,次生孔隙发育,物性较好;而水动力较弱、成分成熟度低的砂岩,次生孔隙不发育,物性差;低位体系域砂体较高位体系域次生孔隙发育,特别是在三级层序界面上的砂体,次生孔隙发育,物性好。砂岩的厚度也对次生孔隙有较大的影响,厚度大的砂岩物性较好。粒度粗、成分成熟度高且处在低位体系域的厚层砂岩,次生孔隙较为发育,为研究区下一步勘探和开发的有利区带。图14参18     

利用微波-分光光度法测定水中化学耗氧量

介绍了一种微波-分光光度法快速测定CODCr的新方法,并与标准方法进行了比较。实验表明,微波-分光光度法具有比标准重铬酸钾法所需水样量小、节省时间、操作简单等优点,经与标准方法对照,其准确度和精密度一致性较好。     

Rheology behavior of high‐density polyethylene/diluent blends and fabrication of hollow‐fiber membranes via thermally induced phase separation

The phase‐separation behavior of high‐density polyethylene (HDPE)/diluent blends was monitored with a torque variation method (TVM). The torque variation of the molten blends was recorded with a rheometer. It was verified that TVM is an efficient way to detect the thermal phase behavior of a polymer–diluent system. Subsequently, polyethylene hollow‐fiber membranes were fabricated from HDPE/dodecanol/soybean oil blends via thermally induced phase separation. Hollow‐fiber membranes with a dense outer surface of spherulites were observed. Furthermore, the effects of the spinning temperature, air‐gap distance, cold drawing, and HDPE content on the morphology and gas permeability of the resultant membranes were examined. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

FPGA中宽边译码器的测试方法研究

现有的关于FPGA的测试主要集中在可编程逻辑和互连线资源,而没有涉及FPGA中的宽边译码器的测试。本文提出了一种测试FPGA中宽边译码器的方法,该方法实现了FPGA中的宽边译码器的逻辑资源及其相连的长线资源的全覆盖测试。该实验采用Xilinx公司的XC4000E系列芯片,在基于SOC软硬件协同技术的FPGA自动测试系统中进行测试。实验结果表明,用本文提出的4次配置图形和测试向量能够完成全覆盖测试。     

影响豆粕挤压组织化显著因素筛选及其工艺优化

豆粕是生产精炼食用大豆油的副产物,富含植物蛋白,是人类及动物很好的蛋白来源。豆粕本身不宜被人类直接食用。为了提高豆粕的可食性,本文利用双螺杆挤压技术对豆粕进行深度组织化,采用L16215直交表做正交试验,对13个可能影响产品性质的因子进行筛选,再经方差分析及因子贡献率分析,选出挤压温度、物料含水率、蛋白添加量、螺杆转速作为单因素,确定最适加工条件。试验结果表明豆粕组织化的最适工艺条件是:挤压温度150℃,物料含水率45%,蛋白添加量72 g(豆粕按150 g计),螺杆转速90 r/min。本研究结果为豆粕的深加工提供参考。     

耐氧性双歧杆菌Bifidobacterium animalis subsp. lactis Qq08的生物学特性研究

利用体外试验测定耐氧性双歧杆菌(Bifidobacterium animalis subsp.lactis Qq08)的耐酸、耐胆汁特性;同时测定其对胆固醇的降解能力和对结肠癌腺细胞Caco-2的黏附性能。结果表明,该菌在pH 2.0条件下培养4 h,仍有84.38%的存活率;用1.0%胆汁培养6 h,该菌的存活率在90%以上。该菌对胆固醇的降解力为53.8%,对结肠癌腺细胞Caco-2的黏附数为(8.57±3.74)个/细胞。该菌可作为益生菌制剂和功能性乳制品的潜在菌株。     

高产酸性脲酶菌株的分离、筛选与鉴定

为了筛选高产酸性脲酶菌株,通过酸性平板的初筛和中性平板的复筛,从土壤中分离到17株产酸性脲酶的菌株。通过比较它们所产酸性脲酶的活性,确定了产酶能力最强的菌株ZJU-5,发酵液中酸性脲酶活性可达(17.17±0.185)U/mL。为了了解该菌株的特性,通过生理生化方法及16SrDNA分子生物学方法对ZJU-5进行鉴定,结果表明ZJU-5为肺炎克雷伯氏菌。     

A starch‐based biodegradable film modified by nano silicon dioxide

The purpose of this work was to improve the properties of the starch/poly(vinyl alcohol) (PVA) films with nano silicon dioxide (nano SiO₂). Starch/PVA/nano‐SiO₂ biodegradable blend films were prepared by a solution casting method. The characteristics of the films were assessed by Fourier Transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X‐ray photoelectron spectroscopy (XPS). The results obtained in this study indicated that the nano‐SiO₂ particles were dispersed evenly within the starch/PVA coating and an intermolecular hydrogen bond and a strong chemical bond C? O? Si were formed in the nano‐SiO₂ and starch/PVA. That the blending of starch, PVA and nano‐SiO₂ particles led to uniform starch/PVA/nano‐SiO₂ blend films with better mechanical properties. In addition, the nano‐SiO₂ particles can improve the water resistance and light transmission of the blend films. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

MAP法处理氨氮废水的过程模拟

目前国内含氨氮废水的处理主要采用生物脱氮技术,但这种方法对于高浓度的氨氮废水效果不佳。近年来,对于磷酸铵镁（MAP）化学沉淀法除氨氮,即铵离子可以和镁离子、磷酸根在适当的条件下生成磷酸铵镁沉淀的研究很多。本文从热力学的角度模拟了MAP体系中pH值和药剂配比对MAP形成的影响,提出了优化氨氮废水处理的措施。