搜索结果: 121-135 共查到“知识库 无机化学”相关记录1634条 . 查询时间(6.199 秒)
粒径分布对水焦浆性质的影响
成浆性 流变性 稳定性 聚结
2015/12/23
分析研究了不同粒径分布的石油焦成浆性及制备水焦浆的流变性和稳定性。结果表明,石油焦的成浆性较好,成浆浓度近70%,浆体的表观黏度均随浓度的增大而增大。粒径分布越宽,越有利于堆积,堆积效率越高,可制浆浓度越高,制备水焦浆的最佳药剂量越低,采用萘系分散剂制备的水焦浆呈胀塑性流型,粒径分布越宽,胀塑性越弱,利用静置观察法与Turbiscan Lab稳定性分析仪测定相结合评价水焦浆的稳定性,水焦浆的稳定性...
采用水热法合成了纳米棒状La(OH)3载体,通过湿式浸渍方法制备了10%Ni/La(Ⅲ)负载型催化剂,考察了500~800℃不同焙烧温度对于催化剂氢解山梨醇制备低碳二元醇的影响,结合XRD、SEM/EDS、BET、H2-TPR-MS、CO/CO2-TPD-MS、TG和ICP-AES等表征手段对Ni/La(Ⅲ)催化剂的构效关系进行了分析。结果表明,Ni/La(Ⅲ)催化剂表现出高的氢解反应活性,在较低...
气相色谱—质谱联用技术分析藿香挥发油化学成分
铜配合物 晶体结构 氢键
2018/10/8
以湛江市遂溪县产藿香为研究对象,采用水蒸气蒸馏法提取藿香的挥发油成分,利用气相色谱—质谱联用技术结合程序升温保留指数进行定性分析,采用峰面积归一法进行定量分析.共分离出90种化学成分,鉴定了 50种化合物,占挥发油总量的72.53%,主要成分有广霍香醇(24.88%)、δ-愈创木烯(16.05%)、α-广藿香烯(7.61%)、α-愈创木烯(7.36%)、丁香烯(3.63%)、β-广藿香烯(3.38...
用微型催化反应装置结合X射线衍射(XRD)、H2化学吸附、NH3吸附-程序升温脱附(NH3-TPD)和H2-程序升温还原等多种物理化学手段研究了丙烷脱氢负载型PtSnNa/SUZ-4催化剂中Na+助剂组分的作用。结果表明,Na+组分可中和SUZ-4载体表面的强酸中心、提高催化剂的Pt金属分散度、抑制脱氢产物的裂解和积炭的生成,从而提高催化剂的丙烷脱氢选择性和反应稳定性。但是过量Na+组分的存在会削...
海胆状纳米MnO2的制备及其对CL-20热分解性能的影响
物理化学 海胆状纳米MnO2 CL-20 热分解机理
2015/7/28
采用水热法合成海胆状纳米MnO2颗粒，用X射线粉末衍射(XRD)和扫描电子显微镜及X射线能谱分析(SEMEDS)对该MnO2颗粒进行物相组成及结构表征；用固体研磨法制备出质量比为1∶2、1∶5和1∶9的纳米MnO2/CL-20混合物；用差示扫描量热(DSC)法考察了纳米MnO2对CL-20热分解性能的影响。结果表明，纳米MnO2的加入不会改变CL-20热分解过程的最可几机理函数；加入纳米MnO2后...
TSR成因H2S的硫同位素分馏特征与机制
硫同位素 热化学硫酸盐还原反应 硫化氢 四川盆地
2014/12/20
热化学硫酸盐还原反应（ＴＳＲ）是深层碳酸盐岩油气藏中硫化氢的主要成因机制，目前已在全球发现了５０多个
ＴＳＲ成因的大中型含硫化氢天然气田。通过对中国四川盆地含硫化氢气田硫化物的采集与同位素分析，结合全球含硫化氢天
然气田硫同位素分析数据，研究了ＴＳＲ过程中硫同位素的地球化学行为和分馏特征。研究发现，ＴＳＲ成因的高含硫化氢天然
气中，硫化氢与硫酸盐的硫同位素分馏值小于１５‰，主要分布范围为２...
生物碳的物理结构与化学成分对土壤氧化亚氮排放的影响
生物碳 物理结构 化学成分 氧化亚氮
2014/12/20
为探究生物碳对土壤中重要温室气体氧化亚氮(N2O)排放的影响机制,将生物碳的可溶性化学成分和稳定的物理结构分离后得到浸提液和碳骨架,设置了4种不同的实验处理方式:土壤(对照)、土壤+生物碳、土壤+浸提液、土壤+碳骨架,进行了为期90 d的室内培养试验.实验结果显示,在培养前期(前7 d),添加生物碳和碳骨架的处理都显著抑制了土壤N2O的释放,且抑制程度相似,最高均可达80%,而添加浸提液的处理却显...
A cloud chemistry module for the 3-D cloud-resolving mesoscale model Meso-NH with application to idealized cases
cloud chemistry module 3-D cloud-resolving mesoscale model
2014/12/12
A complete chemical module has been developed
for use in the Meso-NH three-dimensional cloud resolving mesoscale model. This module includes gaseousand
aqueous-phase chemical reactions that are anal...
Improving the representation of secondary organic aerosol (SOA) in the MOZART-4 global chemical transport model
secondary organic aerosol MOZART-4
2014/12/12
The secondary organic aerosol (SOA) module
in the Model for Ozone and Related Chemical Tracers,
version 4 (MOZART-4) was updated by replacing existing two-product (2p) parameters with those obtained...
SPECTROSCOPIC STUDIES OF NON-COVALENT METAL ION-LIGAND INTERACTIONS
SPECTROSCOPIC STUDIES ON-COVALENT METAL ION-LIGAND
2014/11/20
Non-covalent interactions between metal ions and ligands such as water and methane have been extensively studied due to their biological and industrial importance. Gas phase studies can reveal the fun...
Coacervation of Oppositely Charged Macromolecules, Micelles and Proteins: Disproportionation and Hierarchical Structures
coacervation complexation phase transitions
2014/11/20
Analogous disproportionation processes lead to similarities in the structures present at incipient coacervation to those within the subsequent dense phase. Coacervation in polyelectrolyte/mixed micell...
Nanoparticle Building Blocks for Functional Structures
Artificial enzyme Water-soluble catalyst
2014/11/20
A major goal in material science is achieving a desired function using structures fabricated with designed building blocks. Advanced synthetic and self-assembly techniques allow various nanomaterials ...
Structural Analysis of Proteins by Covalent Labeling and Mass Spectrometric Detection
mass spectrometry protein 3D structure
2014/11/20
Covalent labeling and mass spectrometry are seeing increased use together as a way to obtain insight into the 3-dimensional structure of proteins and protein complexes. Several amino acid specific (e....
Development and Characterization of Caspase Activatable GFP and a Family of Fluorescent Reporters
apoptosis GFP
2014/11/20
The cellular process of programmed cell death, or apoptosis, is critical in homeostasis and development. In addition it's misfunction is implicated in an array of disease states from cancer to neurode...
Clustering, Reorientation Dynamics, and Proton Transfer In Glassy Oligomeric Solids
imidazole proton transfer reorientation
2014/11/20
We have modelled structures and dynamics of hydrogen bond networks that form from imidazoles tethered to oligomeric aliphatic backbones in crystalline and glassy phases. We have studied the behavior o...