塑料薄膜材料在微藻培养环境中的稳定性和生物附着行为

考察了6种薄膜材料在次氯酸钠(NaClO)溶液、HCl溶液(pH=2)和Na OH溶液(pH=12)中的稳定性及其在普通小球藻培养体系中的生物附着行为。结果表明,聚氯乙烯(PVC)在3种溶液中浸泡后420 nm处的透光率下降约50%,聚氨酯(PU)在NaClO溶液中、乙烯-醋酸乙烯酯(EVA)在NaOH溶液中浸泡后420nm处的透光率下降10%~15%,聚乙烯(PE)、聚丙烯(PP)和聚对苯二甲酸乙二醇酯(PET)在3种溶液中浸泡后的透光率没有明显变化;6种薄膜材料在普通小球藻培养体系中均有微藻明显附着,浸泡7 d后透光率明显下降,其中PVC表面附着最严重,浸泡7 d后透光率接近0,附着物量随浸泡时间延长而增加,浸泡45 d后达3069μg/cm^2;其它5种薄膜表面附着物量先增加后降低,PU和EVA在第15 d时、PE, PP和PET在第30 d时附着物量最大,分别为292, 375, 292, 194和236μg/cm^2

塑料薄膜材料在微藻培养环境中的稳定性和生物附着行为

考察了6种薄膜材料在次氯酸钠(NaClO)溶液、HCl溶液(pH=2)和Na OH溶液(pH=12)中的稳定性及其在普通小球藻培养体系中的生物附着行为。结果表明,聚氯乙烯(PVC)在3种溶液中浸泡后420 nm处的透光率下降约50%,聚氨酯(PU)在NaClO溶液中、乙烯-醋酸乙烯酯(EVA)在NaOH溶液中浸泡后420nm处的透光率下降10%~15%,聚乙烯(PE)、聚丙烯(PP)和聚对苯二甲酸乙二醇酯(PET)在3种溶液中浸泡后的透光率没有明显变化;6种薄膜材料在普通小球藻培养体系中均有微藻明显附着,浸泡7 d后透光率明显下降,其中PVC表面附着最严重,浸泡7 d后透光率接近0,附着物量随浸泡时间延长而增加,浸泡45 d后达3069μg/cm^2;其它5种薄膜表面附着物量先增加后降低,PU和EVA在第15 d时、PE, PP和PET在第30 d时附着物量最大,分别为292, 375, 292, 194和236μg/cm^2

Research on the Coefficient from the Total Horizontal Illuminance to the Vertical Illuminance

【中文摘要】 本文拟从重庆地区观测数据入手，提出垂立面照度转换系数，用它与相应条件下水平面总照度相乘可得到同样条件下的各垂立面照度值。 【英文摘要】 This paper is based on the daylight data measured in chongqing. The changing coeffi- cient of the vertical illuminance is advanced. One of various vertical illuminance is the result that this coefficient times the total horizontal illuminance with the same condition本工作接受高等学校博士学科点专项科研基金资助

防污膜的表面改性方法研究进展

膜分离技术具备高效、节能的优势,广泛应用于生物、水处理、仿生等领域。然而,选择性分离膜在使用过程中产生的膜污染会导致分离效率显著降低,成本提高。膜污染是指微粒及大分子在膜孔吸附、沉积,使膜通量变小的过程。通过对膜结构及膜表面电荷、亲水性、粗糙度的调控可以有效降低膜污染程度,提高分离膜的处理效率。本文总结了近期膜表面改性方法研究进展,重点介绍了化学接枝、物理涂覆、聚合反应改性以及表面分离的防污改性方法

WEAKLY INTERACTING BOSE EINSTEIN CONDENSATION IN A HARMONIC POTENTIAL TRAP

应用数值计算的方法计算了谐振势阱中有弱相互作用的玻色气体凝聚的临界温度和基态占据率。计算结果表明，二者都随着散射长度的增大而减小；但与理想玻色气体相比仅差约04%。The critical temperature and the ground state Fraction of weakly interacting Bose Einstein condensation in a harmonic potential trap are calculated with numerical method.The result indicates that both are decreasing with the scattering length increasing.But, there is only a diFFerence about 0.4% between it and that of ideal case.福建省自然科学基金;厦门光电子公司资

Electronic Raman Scattering, Bound Phonons and DX Centers in n Ga 1-x Al x As

应用统计物理方法对谐振势作用下的理想玻色气体进行理论计算，导出系统发生玻色-爱因斯坦凝聚（bEC）时的一些物理量，发现产生凝聚的情况与外势场的形式紧密相关.由理论计算求得的临界温度TC和基态的粒子占据率n0/n与实验结果符合较好.这些研究有助于对这种新物态性质的了解.The First observation of electronic Raman scattering and bound phonons in n Ga 1-x Al x As is reported.Raman scattering experiments perFormed on n Ga 1-x Al x As samples reveal that there exists an eFFective mass like level For donor impurities giving rise to the bound phonons and the electronic Raman scattering at low temperatures and beyond some critical value of the alloy composition in n Ga 1-x Al x As.At higher temperatures, this level is depopulated to the beneFit of a deep state which has all the characteristics of DX center.These results validate as well a shallow deep bistable character of n type impurities in Ga 1-x Al x As( x >0.45).According to the dynamical theory of crystal lattices, the tharge state of donors in Ga 1-x Al x As has been simply explained.福建省自然科学基

A method of quasi in-situ EBSD observation for microstructure and damage evolution in fatigue and dwell fatigue of Ti alloys

A method of quasi in-situ electron backscattered diffraction observation is developed for investigating microstructure and damage evolution of Ti-6Al-4V ELI alloy under cyclic loadings. It indicates that the slip tends to occur in & alpha; grains with bigger Schmid factors (SFs) for basal slip or prismatic slip and twinning occurs in & alpha; grains with SFs not bigger than 0.2 for prismatic slip for both fatigue and dwell fatigue. The plastic strain caused by dwell stress could restrain the sliding or cleavage induced microcrack growth. Subgrain formation in & alpha; grains due to twinning and dislocation sliding are also captured during cyclic loadings

比特币等虚拟货币本质上不是货币

作者的核心观点是：只要现代经济社会组织形态不发生根本性变化，以国家信用为基础的货币体系就将存在，比特币以及其他虚拟货币就成不了一国的本位币