搜索结果: 46-60 共查到“知识库 应用化学”相关记录926条 . 查询时间(4.709 秒)
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...
以小型流化床为反应器、水蒸气为气化介质,在CaSO4氧载体中加入CaO颗粒进行煤气化—氧载体还原反应实验。实验结果表明,添加CaO改善了煤气化—CaSO4还原反应性能,提高了煤气化—CaSO4还原反应速率和CO2生成速率。但CaO添加剂的催化作用随反应温度的提高而减弱。900 ℃是较适宜的反应温度,此温度下加入适量CaO(CaO/CaSO4物质的量比1.18),气态硫化物释放得到显著抑制,SO2和...
以低温沉淀方法制备的羟基磷灰石(HAp)为载体,采用浸渍法制备了一系列不同Ni含量的Ni/HAp催化剂,并采用BET、H2-TPR、XRD、SEM、FT-IR、TEM和TG-DTA技术对催化剂进行了表征。结果表明,NiO含量为13%的催化剂表现出最好的催化甲烷二氧化碳重整制合成气活性,在850 ℃、空速3.6×104 mL/(h·gcat)的反应条件下,甲烷和二氧化碳的转化率在10 h内分别稳定在...
以胜利褐煤为研究对象,利用FT-IR等手段,用灰分、不同湿度下的平衡复吸水含量等,系统研究了不同相对湿度下K+、Na+、Ca2+、Mg2+的水合作用对胜利褐煤平衡复吸水含量的影响。结果表明,相同浓度不同类型的金属离子与煤样的交换能力的趋势为Ca2+>Na+> K+>Mg2+。金属离子对胜利褐煤平衡复吸水含量影响力的顺序为Mg2+>Ca2+>Na+≈K+。相对湿度高时,平衡复吸水含量的主要控制因素为...
研究了500~900 ℃条件下微晶纤维素在固定床中的热解过程;分别采用气质联用(GC-MS)和气相色谱分析了热解过程中生成的焦油和不可凝气体。结果表明,随热解温度升高,焦油产率减少、气体产率升高、焦产率略微下降,同时CO、CH4和H2的产率明显升高,而CO2的产率变化不明显。焦油主要由二次反应产生,不可凝气体则由一次热解产物和二次热解产物共同产生。使用Gaussian 09软件对热解过程进行了模拟...
以甲醇为液化剂、浓硫酸为催化剂,对竹子、杨木、松木和桉木四种生物质原料的加压液化进行了实验研究。结果表明,在200 ℃下反应30 min后,这些生物质原料可转化得到气体、固体残渣和液体生物油三种产品,且竹子的液化率最高。将竹子液化产物进一步分级处理,得到烷基多糖苷和木素解离多酚两类化学品。其中,多糖苷产品的主要成分为己糖苷类化合物,占83.38%(质量分数);多酚类产品的主要成分为4-乙基-2-甲...
A hybrid stochastic hierarchy equations of motion approach to treat the low temperature dynamics of non-Markovian open quantum systems
A hybrid stochastic hierarchy equations low temperature dynamics non-Markovian open quantum systems
2014/9/24
The hierarchical equations of motion technique has found widespread success as a tool to generate the numerically exact dynamics of non-Markovian open quantum systems. However, its application to low ...
Coherent quantum transport in disordered systems: I. The influence of dephasing on the transport properties and absorption spectra on one-dimensional systems
quantum transport in disordered systems dephasing on the transport properties absorption spectra one-dimensional systems
2014/9/24
Excitonic transport in static-disordered one dimensional systems is studied in the presence of thermal fluctuations that are described by the Haken–Strobl–Reineker model. For short times, non-diffusiv...
Modeling Spatial Correlation of DNA Deformation: DNA Allostery in Protein Binding
Modeling Spatial Correlation DNA Deformation DNA Allostery Protein Binding
2014/9/24
We report a study of DNA deformations using a coarsegrained mechanical model and quantitatively interpret the allosteric effects in protein−DNA binding affinity. A recent single-molecule study (...
纳米尺度金属超分子配合物对DNA的特殊识别与功能调控新进展
纳米尺寸金属超分子配合物 核酸 分子识别 G-四链DNA 手性识别
2014/2/17
配体通过靶向特殊基因,进而调节该基因所参与的生物学功能一直是生物无机化学领域十分活跃的研究课题. 当前,金属配合物对DNA的结构识别以及功能调控引起了人们的高度重视,越来越多的研究表明,金属配合物能够有效地识别DNA的二级结构并影响其生物学功能. 最近研究发现,一些具有纳米尺度的金属超分子配合物能够特异性识别DNA并表现出特殊的生物学效应. 本文总结了纳米尺度金属超分子配合物对不同DNA二级结构的...
A novel construction of complex-valued Gaussian processes with arbitrary spectral densities and its application to excitation energy transfer
complex-valued Gaussian processes arbitrary spectral densities application to excitation energy transfer
2014/9/24
The recent experimental discoveries about excitation energy transfer (EET) in light harvesting antenna (LHA) attract a lot of interest. As an open non-equilibrium quantum system, the EET demands more ...
Probing the Cytoadherence of Malaria Infected Red Blood Cells under Flow
Cytoadherence Malaria Infected Red Blood Cells
2014/9/24
Malaria is one of the most widespread and deadly human parasitic diseases caused by thePlasmodium (P.)species with the P.falciparumbeing the most deadly. The parasites are capable of invading red bloo...