搜索结果: 31-45 共查到“知识库 应用化学”相关记录922条 . 查询时间(2.164 秒)
Instrumental and Chemometric Analysis of Automotive Clear Coat Paints by Micro Laser Raman and UV Microspectrophotometry
Raman microspectrophotometry clear coat automotive paint chemometrics forensic
2015/5/21
Automotive paints have used an ultraviolet (UV) absorbing clear coat system for nearly thirty years. These clear coats have become of forensic interest when comparing paint transfers and paint samples...
超声波辅助浸渍法制备Fe2O3/γ-Al2O3 吸附剂脱除气相As2O3的实验研究
气相砷 吸附剂 吸附温度 SO2/NO
2015/12/24
使用超声波辅助浸渍法制备Fe2O3/γ-Al2O3吸附材料,在固定床反应器上研究了前驱液浸渍浓度、载体粒径、吸附温度、吸附气氛等因素对脱除气相As2O3的影响。结果表明,前驱液浸渍浓度、载体粒径等会对吸附剂表面结构产生影响从而影响其砷吸附性能;吸附温度升高增强了其化学吸附能力,然而,温度过高反而造成吸附性能的下降;吸附气氛中的SO2促进了Fe2O3/γ-Al2O3对气相砷的吸附,气氛中的NO对气相...
熔融灰渣侵蚀耐火材料的界面特性研究
耐火材料 灰渣 侵蚀 界面
2015/3/11
研究了碱酸比不同的3种熔融煤灰(A、J1和J2)在莫来石和刚玉两种耐火材料上的界面特性。结果表明,A对莫来石和刚玉都有很好的润湿性,而J1和J2对这两种耐火材料则经历由不完全润湿到润湿的过程。熔渣与耐火材料(S-R)界面宽度随着接触角减小而增大。从灰渣开始熔融至1 520 ℃,熔融煤灰J1在耐火材料表面上的接触角随着倾角的增加而减小;当倾角为20°时,其接触角突然增大。SEM-EDS分析表明,由于...
采用离子交换法用NH+4、Zn2+、Cu2+、Cr3+阳离子改性NaY分子筛,并利用XRD、FT-IR和低温N2吸附-脱附等方法对改性的分子筛进行了表征。XRD 和FT-IR表征结果表明,改性后的分子筛骨架完好。Cr改性Y分子筛(CrY)的比表面积、孔体积及平均孔径均较小,但存在部分介孔。研究了改性分子筛对含喹啉模拟燃料的吸附脱氮,喹啉分子尺寸的模拟结果为0.711 6 nm×0.500 2 nm...
以半纤维素主要成分木聚糖的两种单体——吡喃木糖和O-乙酰基吡喃木糖为模型化合物,运用密度泛函理论(DFT),采用B3LYP方法和6-31+G(d,p)基组进行计算,研究了吡喃木糖热解形成HAA的6条可能的反应路径和O-乙酰基吡喃木糖热解形成HAA的3条可能的反应路径。由此确定了吡喃木糖热解形成HAA的最优路径为:吡喃木糖首先开环得到链式木糖,然后C3羟基和C2氢脱水,随后经重排和逆醇醛缩合反应生成...
以天然凹凸棒(ATP)为载体,分别利用机械混合法、浸渍法和溶胶-凝胶法制备了3种铁基复合载氧体。利用X射线衍射(XRD)、能谱(EDS)、N2-吸附脱附等温线等对其进行物化表征,并在900 ℃流化床中考察其煤化学链燃烧反应性能。结果表明,ATP能显著增加载氧体比表面积和抗磨损能力,并对煤转化过程有催化作用,其与Fe2O3的协同作用使初始碳转化速率显著提高。溶胶-凝胶法制备的U-Fe4ATP6表面C...
Correlated Local Bending of a DNA Double Helix and Its Effect on DNA Flexibility in the Sub-Persistence-Length Regime
Correlated Local Bending a DNA Double Helix Effect on DNA Flexibility Sub-Persistence-Length Regime
2014/9/24
Mechanical characteristics of DNA in the sub-persistence-length (lP ≈150 base pairs) regime are vital to many of its biological functions but not well understood. Recent experimental studies in this r...
Spectrins in axonal cytoskeletons: Dynamics revealed by extensions and fluctuations
axonal cytoskeleton Dynamics revealed extensions and fluctuations
2014/9/24
The macroscopic properties, the properties of individual components, and how those components interact with each other are three important aspects of a composited structure. An understanding of the in...
在比较DADE的3条文献合成路线基础上,研究了以2-甲基-4,6-嘧啶二酮为母体用硝硫混酸硝化生成中间体2-(二硝基亚甲基)-5,5-二硝基-2H-嘧啶-4,6-二酮、中间体水解合成DADE的方法.DADE总收率达到83%以上,用IR、MS、NMR及元素分析鉴定了其结构.
Template-Induced Structure Transition in Sub-10 nm SelfAssembling Nanoparticles
Directed self-assembly template-assisted self-assembly structure transition gold nanoparticles sub-10 nm patterning electron-beam lithography
2014/9/24
We report on the directed self-assembly of sub-10 nm gold nanoparticles confined within a template comprising channels of gradually varying widths. When the colloidal lattice parameter is mismatched w...
Translocation of a forced polymer chain through a crowded channel
Translocation a forced polymer chain a crowded channel
2014/9/24
We construct a coarse-grained model in terms of the multiple particles collision (MPC) method to study the translocation dynamics of a linear polymer through a crowded channel full of fixed obstacles....
生物燃料电池处理生活污水同步产电特性研究
生物燃料电池 浓度 温度 动力学
2014/5/7
以某生活污水处理厂缺氧池活性污泥为接种体，以葡萄糖为模拟生活废水，构建双室型微生物燃料电池。利用微生物燃料电池（MFC，Microbial fuel cell）实现生活废水降解与同步产电。研究基质降解动力学及温度对MFC电极过程动力学的影响，明确微生物电化学活性、阳极传荷阻抗、阳极电势、电池产能之间的关系，考察库伦效率及COD去除率。研究结果表明，电池功率输出与基质浓度关系遵循莫顿动力学方程：P=...
Shape transition of unstrained flattest single-walled carbon nanotubes under pressure
Shape transition unstrained flattest single-walled carbon nanotubes under pressure
2014/9/24
Single walled carbon nanotube’s (SWCNT’s) cross section can be flattened under hydrostatic pressure. One example is the cross section of a single walled carbon nanotube successively deforms from the o...
三聚氰胺浸渍活性炭用于低温NH3-SCR脱硝的研究
脱硝 活性炭 选择性催化还原 含氮官能团
2014/5/7
通过将三聚氰胺（M）浸渍在活性炭（AC）上制备了渗氮活性炭（ACM），研究了浸渍时间、煅烧温度等因素对ACM含氮量以及低温NH3-SCR脱硝活性的影响。结果表明，三聚氰胺浸渍后可以提高活性炭的低温脱硝活性，在80 ℃下ACM-5-900的NO转化率达到51.67%，而AC只有21.92%。采用BET、元素分析及XPS等分别对渗氮活性炭ACM的结构、表面含氮量以及含氮官能团分布进行分析，表明含氮官能...
Excitonic effects from geometric order and disorder explain broadband optical absorption in eumelanin
geometric order disorder explain broadband optical absorption melanin
2014/9/24
Eumelanin is a ubiquitous biological pigment, and the origin of its broadband absorption spectrum has long been a topic of scientific debate. Here, we report a first-principles computational investiga...