利用响应面分析法优化鸟苷发酵培养基

目的利用响应面分析法对鸟苷发酵培养基进行优化,提高鸟苷产量。方法采用响应面分析法对鸟苷发酵培养基的3种主要成分葡萄糖、酵母粉和豆饼水解液进行优化。用Design-Expert软件对实验数据进行多元回归分析,并建立3种因素与鸟苷产量之间的函数关系。用最终优化的配方进行3次验证试验。结果通过岭脊分析,获得培养基中3因素最佳浓度为:葡萄糖12.0%,酵母粉1.4%,豆饼水解液4.0%,发酵液鸟苷最高产量可达28.3g/L。3次验证试验所测得的鸟苷产量分别为28.14、28.32和27.86g/L,平均值为28.10g/L,与预测结果基本一致。结论利用响应面分析法可优化鸟苷发酵培养基,显著提高鸟苷的产量。     

泰州市大气环境质量的模糊综合评价

将熵权理论与模糊综合评价法相结合,选用PM10、NO2、SO2作评价因子,对泰州市2013年期间某日的大气环境质量作出客观评价,结果表明大气环境质量达到一级标准水平,首要污染物为PM10,评价结果符合客观实际,为泰州市大气防治工作提供参考。     

驱油用聚丙烯酰胺溶液界面特性研究

使用 TRACKR全自动液滴界面张力仪测量了不同试验条件下十二烷 /聚丙烯酰胺溶液界面扩大、缩小时的流变特征及界面张力 ,开发出了用以表征液膜强度的界面黏弹性 E的测量方法。在十二烷 /聚丙烯酰胺界面形成稳定的过程中界面 (扩张 )黏弹模量不断增加 ,并逐渐达到恒定 ,其中弹性成分所占比例远大于黏性成分即 E′>E″。考察的聚合物浓度范围为 5 0～ 2 0 0 0 mg/ L ,界面黏弹模量从 1 7.6提高到 3 0 .6m N·m-1。放置 3 d后的聚合物溶液界面黏弹模量保留率为 82 .8%。实验结果表明聚合物浓度变化对界面张力影响不显著。     

固定化微生物技术处理废水研究进展

对固定化微生物技术及其所用载体进行了介绍。综述了固定化微生物技术在国内外处理氨氮废水、含酚废水、降解芳香族类化合物以及其他有机废水处理中的研究与应用现状。指出了固定化微生物技术存在的问题，并提出了今后的研究方向。     

成骨细胞玻璃化冷冻保护剂的研究

在超低温冷冻过程中,冷冻保护剂(CPA)抑制胞内冰晶形成和避免溶质效应.然而,在其导入和洗脱过程中,由于渗透压的急剧变化将导致细胞大量死亡.本文以成骨细胞为样本,通过测定冷冻保护剂的玻璃化温度、CPA导入和洗脱时渗透压变化及其对细胞活性的影响,研究冷冻保护剂浓度和不同种类保护剂的联合使用对成骨细胞玻璃化冷冻过程的影响.     

Multilayer composite surfaces prepared by an electrostatic self‐assembly technique with quaternary ammonium salt and poly(acrylic acid) on poly(acrylonitrile‐co‐acrylic acid) membranes

An electrostatic self‐assembly technique was applied to prepare ion complex polymer layers on polyacrylonitrile with acrylic acid segments {poly(acrylonitrile‐co‐acrylic acid) [P(AN‐co‐AA)]}. For the ionic complex layers, quaternary ammonium salts, such as cetyl trimethyl ammonium chloride (CTAC) and tetramethyl ammonium chloride (TMAC), were used as cationic species, and also, poly(acrylic acid) (PAA) was used as an anionic species. These cationic and anionic species were self‐assembled alternately on the surface of the P(AN‐co‐AA) membrane. Fourier transform infrared spectroscopy, AFM, and water contact angle measurements of the membrane surface were used to confirm the formation of the multilayer composites on the P(AN‐co‐AA). The permeabilities of water and macromolecules of different molecular weights were evaluated by a membrane filtration technique. The values of permeability strongly depended on the formation layer by layer of these ion composites on the base P(AN‐co‐AA). Through the measurement of the values of the contact angle of water, it was clear that surface nature of the base membrane treated by CTAC or TMAC and PAA dramatically changed. We concluded that such an electrostatic self‐assembly technique is useful for the preparation of multicomposite layers to modify the surface of base P(AN‐co‐AA) membranes. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

钌基催化剂用于直接法合成气制低碳烯烃反应

以γ-Al₂O₃为载体,通过等体积浸渍法制备钌基催化剂,用其进行催化CO加氢,研究制低碳烯烃反应中钌基催化剂的催化性能,考察催化剂的焙烧温度、工艺条件及碱金属助剂Na对钌基催化剂CO加氢反应的影响。结果发现,焙烧温度400 ℃制备的钌基催化剂具有最大的比表面积,在反应温度220 ℃、反应压力1.0 MPa和空速1 500 mL·(h·g)^-1条件下,可以保证较高的CO转化率及低碳烯烃选择性。碱金属助剂Na提高了催化剂催化活性,Na质量分数为4%6%时,钌基催化剂表现出最佳的CO转化率及低碳烯烃选择性。     

石墨烯材料的吸附性能研究进展

石墨烯材料的吸附性能引起了国内外科学工作者的极大关注,主要介绍了近些年石墨烯和氧化石墨烯对水中金属离子、有机染料、无机非金属离子的吸附性能及研究进展。     

丁酮-水共沸物系的萃取分离

采用液液萃取进行丁酮-水共沸物系的分离。测定了三元体系丁酮-水-（1-乙基-3-甲基咪唑醋酸盐）的液液平衡,采用NRTL活度系数方程对液液平衡数据进行回归得到组分间的二元交互作用参数。利用流程模拟软件ChemCAD进行了以离子液体为萃取剂的液液萃取过程的模拟,研究了理论板数、溶剂比（萃取剂摩尔流量和原料摩尔流量的比值）对萃取过程的影响,通过灵敏度分析,获得了优化的操作参数。在最适宜操作条件下,丁酮的摩尔分数可达0.999 4,离子液体经过回收能够直接循环使用。     

High lumen density of Al2O3-LuAG: Ce composite ceramic for high-brightness display

Thermally robust and highly efficient green-emitting luminescent ceramics are gradually attracting great attention as promising phosphors using in high-brightness laser phosphor display to reduce serious speckle noise as well as high cost. However, lumen density is still seriously restricting their potential applications especially under high-power density laser due to insufficient absorption of blue laser and significant thermal quenching. Here, we report an Al₂O₃-LuAG: Ce composite ceramic phosphor (CCP) for high-brightness laser phosphor display. Owing to good optical properties and high thermal conductivity of Al₂O₃, the Al₂O₃-LuAG: Ce CCP shows high photoluminescence quantum yield (79.6%), low thermal quenching (only 3.2% loss in luminescence at 200°C), and high thermal conductivity (18.9 W·m⁻¹·K⁻¹). Moreover, the Al₂O₃, as scattering centers, enhances the Rayleigh–Mie scattering of the blue laser, and hence the absorption of the Al₂O₃-LuAG: Ce CCP exhibits a remarkable improvement (~2.3 times) at 450 nm. Finally, with optimized thickness (0.3 mm) of Al₂O₃-LuAG: Ce CCP, an excellent luminous efficiency (216 lm·W⁻¹) and outstanding lumen density (6129 lm·mm⁻²) of the green-emitting light source was obtained by driving under a high-power density (28.33 W·mm⁻²) blue laser. All of those validate the suitability of the Al₂O₃-LuAG: Ce CCP for high-brightness display.