基于MoO3和Re-Bphen修饰有机太阳能电池性能的研究

有机太阳能电池(OSCs)的性能与材料及器件结构密切相关。以MoO3为阳极缓冲层,有机金属配合物Re-Bphen为阴极缓冲层,制备了结构为ITO/MoO3/CuPc/C60/Re-Bphen/Al的OSCs。在标准太阳光照条件下,当MoO3和Re-Bphen的厚分别为5nm和8nm时实现了器件的最佳性能,能量转换效率(PCE)和器件寿命均显著提高。结合器件结构,分析了工作机制。     

高产核酸的热带假丝酵母诱变选育及其发酵条件优化

以热带假丝酵母（Candida tropicalis）HY4-17为出发菌株,采用电子束辐射技术诱变,经过初筛、复筛及遗传稳定性试验选育核酸高产菌株,通过Plackett-Burman试验、最陡爬坡试验及响应面法优化培养基,并优化接种量和发酵时间以提高核酸产量。结果表明,获得一株生长快速,遗传稳定的突变菌株EBI-21,其核酸含量较出发菌株HY4-17提高了25%。最佳培养基组成为：糖蜜185 g/L,硫酸铵3 g/L,硫酸锌0.05 g/L,硫酸镁0.5 g/L,硫酸亚铁0.05 g/L,磷酸1 mL/L,pH值为4.5。在优化培养基及接种量8%,发酵时间12 h条件下,核酸产量达到1.73 g/L,较未优化前提高了80.21%,培养时间缩短了10 h。     

Effects of main factors on remedying northern landscaping water by hybrid ecological filter

Natural zeolite and coal cinder were layered as main packing medium of the ecological filter instead of traditional filling to remedy the static lake water in Northern China.The ecological filter was running in a combined upward and downward flow mode.Dynamic experiments were carried out to study the effects of retention time and ambient temperature on pollutants’ removal efficiency of the hybrid ecological filter.The function of plant was also studied by contrast test.It is showed that the removal efficiencies of NH4+-N and TP are increased when the retention time is changed from 1 h to 2 h and 4 h,but the removal efficiency of TN is decreased,the removal efficiency of NH4+-N is increased from 91.5% to 98% and that of TP is increased from 31.8% to 52.5%.When the temperature declines,the temporal removal efficiency of NH4+-N is reduced,but the removal efficiency of 24 h and 48 h is remained.The removal efficiency of TP after 24 h and 48 h is decreased when the temperature declines evidently.The retention time plays an important role in NH4+-N and TP removal,and the ambient temperature is significant for TP removal.The plant favors for TP and organic matter removal but has little effect on TN removal.     

复合生态床修复北方景观水体的影响因素研究

采用以沸石和煤渣为基质的复合生态床修复北方微污染景观水体,考察了水力停留时间、温度、植物等因素对修复效果的影响.结果表明,当水力停留时间由1 h增至4 h时,系统对NH4+-N和TP的去除率分别由91.5%、31.8%提高至98%、52.5%;当温度下降时,对NH4+-N的总体去除效果无明显变化,对TP的去除率则明显降低;在床体表面种植植物能够提高系统对NH4+-N、TP和TOC的去除效果.     

基于CuBB为阴极缓冲层有机太阳能电池性能的研究

通过定向合成Cu(I)配合物,首次将 其作为阴极缓冲层引入到有机太阳能电池(OSCs)中。实验分析发现,OSCs的光电能量转换效 率(PCE)与CuBB层厚度紧密相关,在标准太阳 光照条件下,结构为ITO/CuPc (20nm)/C60(40nm)/CuBB (x m m)/Al (100nm)的器件PCE随着CuBB厚度的增加 先增大后变小,当厚为8nm 时PCE达到0.94%。器件性能提高的原因主要是CuBB具有良好 的电子迁移率,但厚度过大时则由于串联电阻增加及电子不能经阴极缓冲层传输而使性能降 低。     

基于视觉特征的图象搜索引擎设计与实现

文章将基于WWW的搜索引擎技术与基于数据库的图象检索技术有机结合起来,提出了一种基于视觉特征的图象搜索引擎方案,并实现了一个图象搜索引擎系统。该系统先用网络机器人在WWW上搜索图象,提取其颜色、纹理或形状特征,与提交的示例图象特征作比较,把图象的URL按与示例图象的相似度大小顺序存入数据库,然后从数据库中返回结果给用户,并在屏幕上显示。实验结果表明,该系统简单易行,能较好地满足用户的需求。     

复合型生物滤床修复城市景观水体的试验研究

采用天然沸石、炉渣、砂子为填料,构建了上向流-下向流复合型多层生物滤床,分别在静态和动态条件下研究了其对景观水体中氮、磷等营养盐的去除效果,并对其去除机理进行了分析.结果表明,在不同的循环周期下,通过物理吸附、化学结合、生物降解等过程,水体中的氮特别是氨氮得到了很好的去除,去除率达96.44%,出水氨氮稳定在0.5 mg/L以下;对磷的去除率为46.54%.微生物固定化过程以及动态流条件对水体中氮、磷的去除有明显的促进作用.     

电子束辐射对铜绿微囊藻生理活动的影响

采用电子束辐射方法对铜绿微囊藻生长进行抑制和去除,通过呼吸速率及主要酶活性的变化,研究不同辐射剂量对藻细胞生理活动的影响.结果表明:电子束辐射使铜绿微囊藻受到严重迫害,呼吸速率及抗氧化酶活性在逆境胁迫条件下先增加后降低.3～5 kGy辐射迫害较为严重:藻细胞在辐射胁迫下引起抗氧化酶系统活性降低,体内活性氧产生和清除间的...     

Remediation of static lake water by intensified filter of dominant bacteria colony

An ecological filter is constructed for successful nitrification instead of conventional filter system. Zeolite and coal cinder compose main substrates of this micro-ecological filter. Nitrogen contamination removal process is investigated in three different systems (D system, A system and N system) contrastively. Dominant bacteria colony is applied to intensify the remedying process. The data showed that, NH4+-N removal efficiency in D system is better than those in the other two systems for zeolite absorption, nitrogen removal efficiency by nitrification increased. Functional bacterium consortium can adsorb much NH4+-N in short time. Most nitrogen removal is hastened through nitrification by abundant nitrous and nitride bacterium in dominant colony. That dominant consortium keeps high activity in long time. Phosphorus removal is improved by abundant aboriginal bacterium. Complex functional bacterium is benefit to decompose organic phosphorus and its removal.     

电子束辐射对铜绿微囊藻蛋白质及抗氧化体系酶活性的影响

铜绿微囊藻以其毒素和产生的嗅味威胁人类健康和安全,且因大量生长和难去除性给水处理带来困难。本文以电子加速器产生的电子束对铜绿微囊藻培养液（对数生长期）分别进行1、2、3、4和5 kGy剂量的辐射,通过考察藻细胞蛋白质、抗氧化体系酶活性及光合速率的变化,研究辐射对铜绿微囊藻生命特征及机能产生的影响。结果表明：1 kGy的辐射对藻细胞可溶性蛋白质及POD、SOD活性的影响较小;而2～5 kGy的辐射明显降低了蛋白质含量,并破坏了藻细胞的抗氧化系统,光合速率也因辐射明显降低,使铜绿微囊藻短时间内失活。表明一定剂量的电子束辐射能有效控制藻细胞生长,并影响其重要生命特征。