100 research outputs found
Ordered Mesoporous Carbon/Graphene/Nickel Foam for Flexible Dopamine Detection with Ultrahigh Sensitivity and Selectivity
柔性生物传感器在可穿戴电子设备中有着广泛的应用前景. 为了获得柔性电化学多巴胺传感器,作者在本工作中首先在镍泡沫表面通过化学气相沉积生长石墨烯,随后通过高温碳化嵌段共聚物与酚醛树脂在石墨烯表面共组装形成的薄膜制备了有序介孔碳/石墨烯/镍泡沫(OMC/G/Ni)复合材料. 其中,镍泡沫可以为复合材料提供具有高导电性和良好柔韧性的金属骨架,而具有垂直排列介孔阵列的有序介孔碳层为复合材料提供了高的电活性表面积,且有利于活性位点的暴露. 值得注意的是,夹在有序介孔碳层和镍泡沫之间的石墨烯极大地增强了各组分之间的相容性,有利于进一步提升复合材料的电化学性能. 作为电化学传感器中的工作电极,OMC/G/Ni体现出优异的多巴胺检测能力. 不但具有宽的线性检测范围(0.05 ~ 58.75 μmol·L-1)和低检测限(0.019 μmol·L-1),还具有良好的选择性、重现性和稳定性. 此外,OMC/G/Ni在弯曲状态下依旧能够保持对多巴胺的高检测能力,证明了其在柔性生物传感器中的应用潜力.Flexible biosensors have received intensive attentions for their potential applications in wearable electronics. To obtain flexible electrochemical dopamine (DA) sensors, the ordered mesoporous carbon/graphene/nickel foam (OMC/G/Ni) composite was fabricated in this work via the growth of graphene on Ni foam by chemical vapor deposition, and the formation of the OMC layer followed by the carbonization of co-assembled resol and block polymer., The monolithic Ni foam in the resultant OMC/G/Ni electrode provided an interconnected metal framework with high conductivity and good flexibility, while the OMC layer with the vertically aligned mesopore arrays rendered the composite a large electroactive surface with highly exposed active sites. More importantly, the graphene sandwiched between the OMC layer and Ni foam greatly enhanced the compatibility of each component. As the integrated electrode in DA sensor, the OMC/G/Ni electrode exhibited excellent performances with a large linear detection range (0.05 ~ 58.75 μmol·L-1), an ultra-low detection limit (0.019 μmol·L-1), high selectivity, good reproducibility and high stability, outperforming the recently reported flexible DA sensors. Moreover, the OMC/G/Ni electrode still kept the good DA sensing behavior at its bent states, demonstrating its potential for flexible biosensors.通讯作者:刘瑞丽E-mail:[email protected]:LIURui-liE-mail:[email protected]. 上海交通大学电子工程系,上海 2002402. 上海交通大学化学化工学院,上海 2002401. Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China2. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai,200240, P. R. Chin
Thermodynamic Analysis of the Efficiency Improvement of a Photovoltaic-thermoelectric Hybrid System
太阳能电池和热电模块组成的复合系统有望获得较高的太阳能到电能的转换效率。本文利用热力学方法分析了由商业化太阳能电池构成的复合系统,并根据一维模型下能流输运特性计算了系统内各模块温度及其对转换效率的影响,发现低温度系数和低效率的太阳能电池可以通过构建复合系统获得更大的性能提升。同时,由于太阳辐照的有限性导致流经热电模块的热流受到限制,因此热电模块效率无法达到理想条件下的最优值。这表明复合系统的优化并非各个模块优化后结果的简单线性叠加,而需要考虑构成复合系统的各个模块间的约束条件进行整体计算和优化,即复合系统效率不仅与材料本征特性(如电导率、热导率等)有关,也和其工作状态(如入射太阳辐照强度、热电模块构成及几何尺寸、模块之间热学特性等)有关。上述模型与结果对于类似复合系统的设计有着指导作用。A hybrid system formed by a photovoltaic module and a thermoelectric module has a great potential to enhance the solar-to-electricity efficiency.A mathematical model based on the first law of thermodynamics and the heat transfer analyses of the hybrid system is built, where the overall efficiency of the system is enhanced by optimizing the system as a whole.The model is used to study hybrid systems formed by commercially available photovoltaic modules and thermoelectric modules.It is found that, due to a limited incoming heat flux for the thermoelectric module, the overall performance of the hybrid system depends not only on the intrinsic properties of the materials forming such a hybrid system, but also on their working conditions, such as incoming solar radiation, geometry of each module, and interfacial properties.The results indicate that only photovoltaic modules with low temperature coefficient and low efficiency can truly benefit from forming such hybrid system, and the optimization of a hybrid system must be done as a whole.教育部高等学校博士学科点专项科研基金新教师项目(20090121120028);教育部高等学校博士学科点专项科研基金博导类项目(20120121110021); 国家自然科学基金项目(U1232110
改革开放:中国电影的艺术成就与文化表达
钟大丰在市场化进程中探索中国电影学院的追求回顾我们改革开放四十年,从中国的范围来讲,是一个不断走向商品市场开放的过程。电影的发展和市场开放的进程有着特别紧密的关系,当我们跟改革开放的总体进程结合得比较紧的时候,我们会看到电影表现出活力;当我们离开改革开放进程相对比较远的时候,它的活力就会减少,问题就会出现,改革开放这四十年并不一直是一帆风顺的。很多人对80年代的活跃局面很怀念,那个时
江西南昌西汉海昏侯刘贺墓出土玉器
江西南昌西汉海昏侯刘贺墓(M1)出土玉器[1]约400件(套),包括约40种器形。全部玉器分散存放在墓室的不同区域(墓室平面图参见本期第5页图一),表现为不同区域器形有别,具有不同的功能属性。据此特点,本文按出土玉器的不同区域划分,共甄选出具有代表性的38件玉器介绍如下。一西藏椁(一)娱乐用器库共出土玉器13件,其中舞人玉佩、双龙首国家社科基金重大委托项目“海昏侯墓考古发掘与历史文化资料整理研究”(项目编号:16@ZH022)子课题“海昏侯墓出土文物研究”成果之
Knowledge Co-Production Process in Information System Development: A Perspective of Intellectual Capital
引入合作共创这一新概念,基于智力资本的视角,提出了检验ISd用户和开发者之间知识共创性的前因和结果变量实证模型,通过267个开发团队的样本数据证实了知识共创性可促进ISd结果,研究结果表明用户和开发者之间的公共知识、关系资本和参与式决策制定过程促进知识共创的有效性。By systematic reviewing and integrating this theory and intellectual capital perspective into this research design,this paper propose a model to examine the antecedents and consequences of knowledge co-production between ISD users and developers.The empirical results verify the hypotheses that knowledge co-production can benefit ISD outcomes,and common knowledge,relational capital and participative decision-making between these two parties increase the effectiveness of knowledge co-production effectively.华侨大学中央高校基本科研业务费资助项目; 华侨大学哲学社会科学青年学者成长工程资助项目(13SKGC-QG14
犁头鳅早期发育
犁头鳅Lepturichthys fimbriata(Glinther)隶属于鲤形目(Cypriniformes)爬鳅科(Balitoridae)犁头鳅属(Lepturichthys),是生活于急流石滩的小型底栖鱼类,分布于长江水系,主要借助其宽大平展的偶鳍和平坦裸露的胸腹部吸附在急流中的砾石表面,依靠角质化的锋利下颌刮食固着藻类和小型无脊椎动物。金沙江的犁头鳅生殖季节为4月中旬至6月中旬,在水流湍急的峡谷江段产漂流性卵。犁头鳅由于对特定环境具有高度的适应性,在研究动物的形态、生态和演化方面有较大意义
5种植物对铀的积累特征差异研究
采用盆栽试验,研究不同铀浓度(0、1、5、20 mg/kg)胁迫下,苜蓿、黑麦草、高丹草、苏丹草和印度芥菜的光合色素、可溶性蛋白质和丙二醛(MDA)含量的变化,以及植物地上部分和根部对铀的富集量。结果表明,低浓度铀可刺激植物光合色素和可溶性蛋白质含量的增加,但随着铀浓度的增加,植物光合色素和可溶性蛋白质含量逐渐下降。铀胁迫诱导植物体内MDA含量呈明显升高的趋势
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