The Controlled Pattern Growth of Aligned Carbon NanotubesAbstract Micropatterns of aligned carbon nanotubes (CNTs) have been prepared by chemical vapor deposition (CVD) method, and patterned structure of aligned CNTs was controlled through patterned formation of silicon oxide (SiO2) using lithographic technology. The simultaneous growth of carbon nanotubes in different directions could be realized. The building of nanotube-based micro-pattern is useful for fabricating electrical devices.(请下载全文欣赏)
在各类水体(如饮用水,地表水,河流水,废水)有机物测量中TOC常被作为水质测定的特征指数。有机碳可以变为有害环境的化合物,并会耗尽水中的氧气。这些样品中通常会带有大量的不溶颗粒物,如沉淀物。在TOC测试时需要被计算进去。国际标准 EN 1484 和 ISO 8245 提供了一种方法去验证不完全溶解样品成分(颗粒物100μ m)的均质化和回收,也称为“回收率测试”。
Self-Assembly of Large-Scale Micropatterns on Aligned Carbon Nanotube FilmsThe fabrication of well-defined structures with nanoscalematerials is a key technology,[1] and self-assembly is anefficient and often preferred process to build micro- andnanoparticles into ordered macroscopic structures.[2] Ascarbon nanotubes are attractive materials for nanotechnologybecause of their interesting physicochemical properties andmolecular symmetries,[3–6] it is necessary to control thearchitecture of carbon nanotubes on the substrates. Mostpatterned carbon nanotubes are formed on prepatternedsubstrates or prepatterned catalysts during the fabricationprocess.[7–9] Herein we report the first use of a long-rangeforce (capillary force) in the self-assembly of three-dimensional(3D) micropatterns on aligned carbon nanotube filmsthrough a water-spreading method after the growth of thecarbon nanotube. It is considered that low-density regions orvacancies of carbon nanotube films play an important role inthe formation of the pattern. Therefore different kinds ofhighly ordered micropatterned structures have been built in acontrolled fashion by introducing vacancies artificially.(请下载全文欣赏)
In recent international collaboration, Idaho National Laboratory (INL) and Universitä t Erlangen (UE)have developed large MIR flow systems which are ideal for joint graduate student education and research. The benefitof the MIR technique is that it permits optical measurements to determine flow characteristics in complex passages andaround objects to be obtained without locating a disturbing transducer in the flow field and without distortion of theoptical paths. The MIR technique is not new itself others employed it earlier. The innovation of these MIR systems istheir large size relative to previous experiments, yielding improved spatial and temporal resolution. This report willdiscuss the benefits of the technique, characteristics of the systems and some examples of their applications to complexsituations. Typically their experiments have provided new fundamental understanding plus benchmark data forassessment and possible validation of computational thermal fluid dynamic codes.
土壤表层 CO2 通量(CO2 efflux),或称土壤呼吸,是生物圈碳循环的主要组成部分,约占整个生态系统呼吸的四分之三(Law et al., 2001)。由于土壤呼吸在全球变暖中的潜在和富有争议的角色地位,土壤 CO2 通量已成为当前气候变化研究的热点。另一方面,全球FLUXNET 网络涡度相关 CO2 通量测量数据也需要通过土壤呼吸监测来解析和解释。土壤呼吸测量方法一般有气体抽样分析法、林冠下层涡度相关法及呼吸室法,由于前两种方法存在一些缺陷,呼吸室法(Chamber technique)已越来越被得到广泛的应用,另外近几年来土壤剖面 CO2 连续测量监测技术也越来越引起高度重视。有研究报道认为,土壤呼吸与总初级生产力(GPP)和冠层光合作用呈相关关系,同时与根系动态也呈很强的相关关系,但有关直接的野外测量数据仍然缺乏(Tang et al.,2005)。为了对我国土壤碳研究提供方法技术支撑,易科泰生态技术公司特与国外先进仪器技术研发公司合作,就目前国际通用的有关研究技术方法汇总如此,详细内容可咨询易科泰生态技术公司 Ecolab 实验室:info@eco-lab.cn或 info@eco-tech.com.cn.
Localized Quantitative Analysis of Polymeric Films through Laser Ablation–Inductively Coupled Plasma Mass Spectrometry. Polymers 2021, 13, 345. (2021 影响因子: 4.967)通过激光烧蚀-电感耦合等离子体质谱法对聚合物薄膜进行局部定量分析