32 research outputs found
新型稠环电子受体的界面修饰对钙钛矿太阳能电池性能的影响
钙钛矿太阳能电池(perovskite solar cells, PSCs)因具有能量转换效率(power conversion efficiency, PCE)高、成本低、易于大面积制造等优点而被科学家们广泛关注.氧化物电子传输层的合理界面设计及修饰对提高器件的PCE和工作长期稳定性有着十分重要的意义.因此,本文采用一种含有烷基噻吩基侧链的稠环电子受体材料3,9-二(2-亚甲基-(3-(1,1-二氰甲烯基)-茚酮))-5,5,11,11-四(5-己基噻吩)-二噻吩并[2,3-d:2′,3′-d′]-s-引达省[1,2-b:5,6-b′]二噻吩(3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(5-hexylthienyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene, ITIC-Th)修饰TiO2电子传输层,制备高效稳定的平面结PSCs.研究结果显示,ITIC-Th的界面修饰改善了TiO2薄膜的形貌、接触角等性质,促进了钙钛矿晶粒的高质量生长,大幅度减少了器件表界面的电荷复合,明显提升了光生载流子的抽取率和输运效率,使经ITIC-Th界面修饰的PSC的PCE从未经界面修饰的15.43%显著提高到18.91%.与此同时,器件稳定性的研究结果显示,在室温和湿度为30%的条件下,经ITICTh界面修饰的PSC的PCE在放置约1000 h后依然保持原来的90%,明显高于未经界面修饰的PSC.研究结果对PSC光伏性能的提升具有重要的实际应用价值和学术意义.国家自然科学基金(61605164);;\n陕西省重点科技创新团队计划(2016KCT-28);;\n陕西省重点研发计划(2017ZDXM-GY-046);;\n福建省科技厅高校产学合作项目(2016H6023)资
Preparation of Co/Ce_(0.5)Zr_(0.5)O_2 catalysts and their catalytic performance in methane partial oxidation to produce synthesis gas
联系作者: 余长林( 1974-) ,湖南炎陵人,男,博士后,副教授,主要从事纳米催化新材料研究,Tel: 0797-8312334; E-mail : yuchanglinjx@
163. com。
本文的英文电子版由Elsevier 出版社在ScienceDirect 上出版( http: / /www. sciencedirect. com /science /journal /18725813) 。[中文文摘]利用共沉淀法制备了具有介孔结构的Ce0. 5Zr0.5O2
固溶体载体,然后浸渍不同质量分数(10%、20%、30%) 的活性组
分钴,制备了系列Co/Ce0.5Zr0.5O2
催化剂。利用N2
物理吸附(BET) 、X 射线粉末衍射( XRD) 、H2-程序升温还原(H2-TPR)、扫
描电子显微镜( SEM) 、透射电子显微镜( TEM) 、程序升温氧化( TPO) 和热重(TG) 等手段对制备和反应后的催化剂进行了
表征,研究了它们对甲烷部分氧化制合成气反应的催化性能。研究结果表明,铈锆固溶体负载的钴比较容易被还原,该系列
催化剂具有较高的活性和对H2
及CO 的选择性,且随Co含量的增加,催化剂的活性和对H2和CO 的选择性得到提高的同时,
也增强了催化剂的抗积炭性能。[英文文摘]Porous Ce0. 5 Zr0. 5 O2 solid solution support was first prepared by a co-precipitation method. Then,
different concentrations of Co ( 10%,20%,and 30 %) were loaded over Ce0. 5Zr0. 5O2 by impregnation process.
The fresh catalysts were characterized by some physicochemical characterizations such as N2 physical adsorption
(BET) ,X-ray diffraction(XRD) ,temperature-programmed reduction of hydrogen ( H2-TPR) ,scanning
electron microscopy (SEM) ,and transmission electron microscopy (TEM) .The amount of deposited carbon
over used catalysts was analyzed by temperature-programmed oxidation of oxygen (O2-TPO) and
thermogravimetry(TG) .The catalytic performance of these Co /Ce0.5Zr0.5O2 catalysts was evaluated by methane
partial oxidation to produce synthesis gas. The results show that cobalt oxide is easy to be reduced to metal cobalt
over Ce0. 5Zr0. 5O2 . This series of Co/Ce0.5 Zr0.5O2 catalysts show high activity and selectivity to H2 and CO. It
was found that loading high concentration of Co could benefit the increase in catalytic activity and ability to resist
the coke.基金项目: 国家自然科学基金( 21067004) ; 厦门大学固体表面物理化学国家重点实验室开放基金( 200906) ; 江西省自然科学基金( 2010-
GZH0048) ; 江西省教育厅科技项目( GJJ12344)
Proteomic Analysis of Rice Cultivar Jiafuzhan in the Responses to Xanthomonas campestris pv.oryzicola Infection
作者简介: 陈芳育(1978-) , 男, 讲师。E-mail : cfy307@ sohu. com * 通讯作者(Corresponding author) : 陈亮( 1963-) , 男, 教授, 博士生导师, 研究方向: 细胞与分子生物学。E-mail: chenlg@ xmu. edu. cn[中文文摘]运用双向电泳分析高抗水稻品种“佳辐占”受强毒力细菌性条斑病病原菌侵染2d后的叶片蛋白质组变化,共发现38个蛋白质发生差异表达,其中32个上调,5个下调,1个新增。用MALDI-TOF-MS分析和数据库检索鉴定出其中的33个差异表达蛋白质,并将它们分为4个功能类群,即信号转导相关蛋白、防卫相关蛋白、代谢相关蛋白和蛋白质稳定相关蛋白。这些蛋白分别参与了信号识别、信号传递、抗氧化、糖代谢、细胞壁加固、植保素合成等抗病生理反应。研究表明,水稻对细菌性条斑病病原菌的侵染存在着一个复杂的抗病信号应答和代谢调控网络,其作用机理可以通过差异表达的蛋白质(酶)反映出来,其中差异表达的8个R蛋白和3个PR蛋白可能与水稻对细菌性条斑病的抗病性密切相关。本研究为进一步揭示水稻对细菌性条斑病的抗性机理及相关抗病基因的功能克隆提供了依据。[英文文摘]Rice bacterial leaf streak( BLS) caused by the pathogen Xanthomonas oryzae pv. oryzicola ( Xooc) is one of the major rice diseases in South China. Here we focus on proteomics as a tool for the discovery of differentially expressed proteins closely related to the disease resistance. The leaves of rice cultivar Jiafuzhan (Oryzae sativa L. ) highly resistant to the disease, were infected by"89773-1- 1" strain of the Xooc with strong pathogenicity. Total proteins were extracted from the leaves sampled at two days after inoculation, and separated by two- dimensional electrophoresis. It was found that there were thirty- eight proteins expressed differentially, of which thirty-two were up-regulated, five down-regulated and one was "new". Of the thirty- eight responsive proteins, thirty-three were identified by MALD-I TOF-MS and database searching.Based on the predicted function, we grouped them into four clusters: signal transduction, defensive responses, substance
metabolism and protein stabilization, which were involved in many resistant physiological react ions, including signal recognition and transduction, antioxidant react ion, carbonhydrate metabolism, cel-l wall reinforcement and phytoalexin
biosythesis. In turn a complex signal transduct ion and metabolic regulative network in the resistant responses to the infection of Xooc was outlined in this work, and the molecular mechanism was revealed by differentially expressed protein/enzyme
patterns during Xooc infection. In this study, eight R proteins and three pathogenesis- related(PR) proteins which might relate closely to the disease-resistance were found. This result provides us the basic information to further reveal the resistant mechanism and conduct functional cloning of the resistan-t related genes in rice to BLS.生物农药与化学生物学教育部重点实验室( 福建农林大学) 开放课题基金项目( KF0411
Effects of alkaline-earth strontium on the performance of Co/Al_2O_3 catalyst for methane partial oxidation
联系作者: 余长林( 1974-) ,湖南炎陵人,男,博士,副教授。主要从事纳米催化新材料研究。Tel: 0797-8312334; E-mail: [email protected]。
本文的英文电子版由Elsevier 出版社在ScienceDirect 上出版( http: / /www.sciencedirect. com /science /journal /18725813) 。[中文文摘]以γ-Al2O3为载体,采用共浸渍法制备了Sr-Co/Al2O3系列催化剂,研究了助剂Sr对Co/Al2O3催化剂上甲烷部分氧化(POM)制合成气反应的影响,并利用N2物理吸附、X射线衍射、H2-程序升温还原和热重等技术对催化剂的理化性质进行了表征。结果表明,未添加助剂的Co/Al2O3和800℃焙烧的Sr-Co/Al2O3催化剂在POM反应初期催化活性很低,然而,当添加Sr的质量分数高于2%时,催化剂表现出很好的催化活性和稳定性。焙烧后的新鲜催化剂上主要存在两类Co物种,一类是与载体相互作用较弱、易被H2还原为单质的Co3O4;另一类是与载体相互作用较强、难还原、无催化活性的CoAl2O4尖晶石。在焙烧过程中,Sr易形成Sr4Al14O25,从而削弱Co与Al2O3之间的相互作用,能在一定程度上抑制CoAl2O4物种的形成,提高催化剂的稳定性和活性。未添加Sr的Co/Al2O3在反应时易发生物相改变生成尖晶石,导致催化剂迅速失活;但当焙烧温度达到800℃时,添加有限量的Sr还是无法阻止CoAl2O4的产生。[英文文摘]A series of Sr-Co/Al2O3 catalysts were prepared by co-impregnation method using γ-Al2O3 as the support.The effect of strontium promoter on the catalytic performance of Co/Al2O3 catalyst for partial oxidation of methane(POM) to synthesis gas was studied.The catalysts were characterized by some physicochemical characterizations such as N2 physical adsorption,X-ray diffraction(XRD),H2-temperature programmed reduction(H2-TPR) and thermogravimetry(TG).The results show that both Co/Al2O3 calcined at 700 ℃ and Sr-Co /Al2O3 calcined at 800 ℃ exhibit low activity and deactivate at the initial stage of POM reaction.The addition of above 2% mass fraction of strontium will greatly enhance the activity and stability of Co /Al2O3.Two types of Co species were identified on the fresh calcined catalysts.One is Co3O4 which weakly interacts with Al2O3 (easily reduced by H2) and the other is the spinel CoAl2O4
( non-catalytic performance) which strongly interacts with the support.During the course of calcination,strontium can react with Al2O3 to form Sr4Al14O25 which will restrain the generation of the CoAl2O4 species and promote the stability and activity of catalysts.Without strontium promoter,CoAl2O4 is easy to be formed over Co /Al2O3 in the POM reaction.However,the formation of CoAl2O4 cannot be avoided with the addition of limited strontium when the calcination temperature is over 800 ℃.国家自然科学基金(21067004,21263005); 厦门大学固体表面物理化学国家重点实验室开放基金(200906);; 江西省自然科学基金(2010-GZH0048); 江西省教育厅科技项目(GJJ12344); 江西省青年科学家培养对象资助(20122BCB23015
Estrogen Impacts on Emotion:Psychological,Neuroscience and Endocrine Studies
雌激素通过复杂的生理和心理学机制对中枢神经系统施加影响.生理学方面包括:雌激素在杏仁核、海马和前额叶等这些与情绪认知相关的重要脑区内影响神经递质的产生和效能;雌激素可以作用于下丘脑-垂体-肾上腺轴,改变情绪性行为;雌激素受体的基因转录也可以调节情绪性行为的变化.雌激素也通过神经心理学的因素影响情绪加工:雌激素可以提高情绪编码技能,提升表情识别的准确性;雌激素能够影响情绪的唤醒,改变个体情绪体验的强度.未来的研究要融合心理、神经和内分泌等各种因素,以解决女性情绪障碍这一难题
新疆棉花生产基础数据库平台建设及其专家系统
自治区科技进步奖二等奖.项目关键成果及其取得方式(1)新疆棉花信息分类标准新疆维吾尔自治区地方标准《棉花作物信息数据元应用规范》(DB65/T3059-2010)。提取棉花作物生育规律的基础数据元概念及数据元,并根据在棉花作物生产过程中的实际应用情况,对棉花作物的生育规律基础数据元进行分类及编码,制订完成了新疆棉花信息分类标准。(2)新疆棉花生产基础数据库平台《棉花生产农情基础数据采集管理系统》(登记号新DGY-2010-0017);国家软件著作权登记《棉花生产农情基础数据采集管理平台》(登记号2010SR074748)。以OracleSpatial空间数据库为数据支撑,采用MapInfo公司的MapExtreme6.6作为电子地图开发平台,基于O/RMapping技术设计数据库管理模块,并在应用中集成了数据库管理工具。(3)棉花生产管理专家系统国家软件著作权登记《滴灌棉花自动控制灌溉决策支持系统》(登记号2010SR033899);《墒情监测及预报系统》(登记号2011SR026776)。以新疆棉花生产农情基础数据采集管理平台为基础,棉田诊断控制灌溉及随水施肥、施药综合决策技术、棉花主要虫害预警技术及相应的知识模型库为支撑,开发出具有棉花生产信息查询、实时灌溉、施肥、施药方案生成、管网配水方案制定与方案实施、棉花主要虫害预警与防治等功能的软件系统。先进性新疆棉花生产基础数据库平台采用对象关系映射(O/RMapping)技术,有效的保证系统的快速适应性;采用HttpHandler的动态统计图表技术,提高了系统运行效率,减轻了服务器负担,增强了用户体验;系统采用MSMQ(MicrosoftMessageQueue)作为数据缓冲池,同时系统引入事务处理(即元操作)的概念,保证同一用户一次操作的完整性和有效性,同时能还减轻服务器数据并发处理的压力,提高数据吞吐量。创新点(1)首次在国内编制完成棉花作物信息数据元应用规范,并获批新疆自治区地方标准(DB65/T3059-2010);(2)灌溉决策专家系统的知识挖掘技术;(3)棉花自动控制滴灌的灌溉指标阈值及墒情监测点的合理布设方案。推广应用情况:该项目成果在兵团农八师148团、147团推广应用,面积达12000亩,并配置有土壤水分自动采集设备、农田小气象站及虫情自动监测仪器等。应用效果良好。效益及发展前景亩均灌水量238m<'3>,降低了42m<'3>,亩均皮棉产量149kg,提高了11kg,人均管理定额由原来的150亩增加到230亩;智能化滴灌技术与传统灌溉技术相比,不仅节约大量的水资源也大大节省了劳动力。在应用水量减少的同时,也相应降低了耗电量,节约了大量的电能,而且省下的水既可以灌溉其他农田,还可以改善场部周边环境等。智能化滴灌技术对节约能源、资源和保护环境起到了不可替代的作用
Preparation of carbon coated Fe3O4 nanoparticles and their application in the removal of Rhodamine B in aqueous media
采用溶剂热-水热法合成了碳覆盖的Fe3O4纳米粒子Fe3O4/C,利用扫描电镜(SEM)与红外光谱(FT-IR)对其进行了表征,并研究了其对水中罗丹明B的吸附性能.系统考察了吸附动力学、吸附等温线、吸附剂用量对吸附性能的影响.Fe3O4/C对罗丹明B的吸附在3 h内即可达到平衡,最大吸附量可达13.23 mg.g-1.分别用Langmuir和Freundlich吸附模型解释了Fe3O4/C对罗丹明B的作用机理,吸附反应过程符合准二级动力学方程.结果表明,该吸附剂具有良好的磁效应和吸附性能,可快速去除罗丹明B,去除率高达90%以上;吸附剂可重复利用,成本低,具有环境友好的优势
Fe_3O_4/C纳米粒子的制备及其对水中罗丹明B的去除
采用溶剂热-水热法合成了碳覆盖的Fe3O4纳米粒子Fe3O4/C,利用扫描电镜(SEM)与红外光谱(FT-IR)对其进行了表征,并研究了其对水中罗丹明B的吸附性能.系统考察了吸附动力学、吸附等温线、吸附剂用量对吸附性能的影响.Fe3O4/C对罗丹明B的吸附在3 h内即可达到平衡,最大吸附量可达13.23 mg.g-1.分别用Langmuir和Freundlich吸附模型解释了Fe3O4/C对罗丹明B的作用机理,吸附反应过程符合准二级动力学方程.结果表明,该吸附剂具有良好的磁效应和吸附性能,可快速去除罗丹明B,去除率高达90%以上;吸附剂可重复利用,成本低,具有环境友好的优势
青海湖裸鲤繁殖群体遗传多样性的RAPD分析
采用随机扩增多态性DNA(RAPD)方法对青海湖裸鲤的3个洄游繁殖群体-黑马河(HM)、布哈河(BH)及沙柳河(SL)群体各30个个体的DNA多态性进行了分析。用13个引物在三个群体中共检测出85个位点,其中多态性位点68个。青海湖裸鲤群体总的DNA多态位点百分率为80.0%。数据分析结果显示:青海湖裸鲤3个群体总的Nei基因多样性为0.3395,Shannon遗传多样性信息指数为0.4861,存在着较为丰富的遗传多样性。青海湖裸鲤3个群体间平均遗传距离为0.0788,基因分化系数Gst为0.1070,