Papers by Keyword: Chemical Composition

Paper TitlePage

Authors: Muhammad Irfan Khan, Khairun Azizi Azizli, Suriati Sufian, Zakaria Man, Amir Sada Khan, Hafeez Ullah, Ahmer Ali Siyal
Abstract: Infra-red spectroscopic (IR) analysis of the geopolymers provides information regarding gel chemistry, quantitative analysis, kinetics and effect of different activators on geopolymers. This review discusses the IR analysis of geopolymers and their starting materials. Different applications of IR spectroscopy, used in geopolymerization, are explored in detail. Future research questions regarding IR analysis of geopolymers are also discovered
231
Authors: Wu Sun, Yi Jiang, Jun Zhe Liu
Abstract: The microstructure of sea sand concrete wes characterized by the Accelerated Surface Area and Porosimetry System (ASAPS) to detect the concrete micro-prorous structure distribution, the Tabletop Scanning Electron Micro-scope (TSEM) to analysis the sea sand concrete internal microstructure, as well as the X-Ray Diffractometer (XRD) and the Thermal gravimetric/Differemtial Thermal Anylyzer (TG/DTA) to observe the composition of concrete in this paper. The influence on hydration processes of concrete caused by sea sand was reseached from four aspects which are the influences of fly ash on concrete, chlorine salts on sea sand concrete, chlorine salt on fly ash added sea sand concrete and desalination sea sand and not desalination sea sand concrete micro structure features to evaluate the effect of sea sand on regular sea sand concrete and fly ash added sea sand concrete micro structure features and chemical composition.
1076
Authors: Angelo Agostino, R. Falcone, M. Vallotto, M. Verità
Abstract: Portable energy-dispersive micro X-ray fluorescence spectrometry (-EDXRF) is a useful device for non-destructive chemical analysis of different materials. Despite its evident potential in the fields of glass analysis, only few archaeometric studies have been performed yet. In this work preliminary results on the analysis of different types of industrial glass by -XRF are presented in view to apply this method in industrial applications (monitoring of glass cullet, production quality control, classification of end products, etc.). The experimental results show a reliable qualitative recognition of detectable elements in the glass. A good correlation line intensity/concentration was verified for several important elements. Furthermore very low limits of detection were estimated for critical elements such as Fe, Cr and Pb.
559
Authors: Grzegorz Sońta, Agata Dudek, Jacek Selejdak, Robert Ulewicz
Abstract: The paper presents the results of the structure and chemical composition of materials used to manufacture of gear wheel for the automotive industry. Analyzed gear wheel that is a part of one of the mechanical systems of an automotive vehicle was made of sinter Sint-D 32 in the technology of powder metallurgy and alloy structural steel for quenching and tempering 42CrMo4. The cause of the analysis was to research for an alternative material for sinter Sint-D 32 after identified low static strength according to the requirements applicable in the automotive industry. For the analysis were used standard test methods applicable in materials science. Based on microstructure and mechanical properties analysis performed according to requirements applicable in the automotive industry, the research found that steel 42CrMo4 is relevant material to be used in serial production for this particular gear wheel.
81
Authors: Ting Xiao, Le Wang, Ting Liu, Ai Nong Yu, Xiao Hong Yang
Abstract: Objective: To analyse chemical constituents of the volatiles flowers of Akebia trifoliata. Method: The volatiles of bungei were extracted through Headspace solid-phase microextracti, and then the constituents were separated by GC and identified by MS. Result and Conclusion: 22 Compounds were identified. The principal chemical constituents of the volatiles flowers of Akebia trifoliata are α- Farnesene and Farnesene*(80.827%),Ocimene and Ocimene* (14.699%)、πPatchoulene and πPatchoulene*(1.200%) etc,respectively.
1313
Authors: Rong Zheng, Wei Bin Hu, Xiao Hong Yang
Abstract: Objective: To analyse chemical constituents of the volatiles flowers of Fraxinax sieboldiana. Method: The volatiles of bungei were extracted through Headspace solid-phase microextracti, and then the constituents were separated by GC and identified by MS. Result and Conclusion: 22 Compounds were identified. The principal chemical constituents of the volatiles flowers of Fraxinax sieboldiana are Ocimene(44.783%)、α-Tolualdehyde(13.286%)、Linalool(8.816%)、Phenylethyl Alcohol(4.624%)、Benzaldehyde(3.929%)、Cinnamene(3.840%)、α-cis-Ocimene(3.024%)、Farnesene(2.118%)、β-Pyronene(1.673%)、3-Phenylhexane(1.866%)、1,3,8-p-Menthatriene (1.539%)、Formanilide(1.409%) etc,respectively.
1164
Authors: Yu Hong Tian, Zi Li, Shi Hua Wu, Qiong Huang
Abstract: The in vitro antimicrobial activity of the essential oil from needles of Pinus yunnanensis Franch.var tenuifolia was investigated. The essential oil was obtained by hydro-distillation and analyzed by gas chromatography-mass spectrometry (GC-MS) method. The major compound of the essential oil was α-pinene (22.542%), followed by β-caryophyllene (16.636%), 1,2,4a,5,8,8a-hexahydro-4,7-dimethyl-1-(1-methylethyl)-naphthalene (5.085%), β-cubebene (4.779%), elixene (4.442%), α-cadinol (3.528%),α-caryophyllene (3.459%) and limonene (3.428%). The antimicrobial activity of oil was evaluated by using disc diffusion and agar dilution methods, respectively. The results indicated that the essential oil held moderate antimicrobial activity against tested microorganisms. The essential oil did not differ remarkably in its antibacterial and antifungal activities. The minimum inhibitory concentrations (MICs) were 40 ml/l for bacterial strains, and 80 ml/l for fungal strains.
438
Authors: Chun Yang Han, Guang Fa Liu, Yang Li, Qian Huang, Jian Qing Wang
Abstract: The objectives of this study were to evaluate the antimicrobial efficacy of cinnamon essential oil (CEO) and rhubarb extract (REE) against 5 food-related microorganisms. The major active constituents of CEO were cinnamaldehyde (80.010%) and 2-methoxycinnamaldehyde (10.550%), and the major active constituents of REE were chrysophanic acid (54.950%) and physcion (13.270%). CEO and REE display strong inhibition against 5 strains. The checkerboard method was used to investigate the synergy antimicrobial potentiality of a combination of CEO and REE by analysis of the fractional inhibitory concentration index (FICI). The FICI was calculated and interpreted as synergy, addition, indifference, or antagonism. The combination showed additive efficacy against all tested microorganisms.
121
Authors: Dong Mei Ding, Fang Jie Wang, Xin Xin Liu, Chun Yang Han
Abstract: The objectives of this study were to evaluate the antimicrobial efficacy of cinnamon essential oil (CEO) and rosemary essential oil (REO) against 4 food-related microorganisms. The chemical components of CEO and REO were also analyzed by GC/MS. The major active constituents of CEO were cinnamaldehyde (80.010%) and 2-methoxycinnamaldehyde (10.550%), and the major active constituents of REO were 1,8-Cineole (51.783%) and α-Pinene (13.508%).The antimicrobial results indicated that both them display strong inhibition against 4 strains. The combination showed additive efficacy against all tested microorganisms. Thus, our study demonstrated that CEO and REO can be considered potential alternatives to control pathogens and microbial in the food or food packaging material.
385
Authors: Shu Qing Zhang, Xiu Ling Lv, Li Hong Zhang, Na Hui Zhang
Abstract: The single factor variance of viscosity experimental data of blast furnace slag was calculated by Minitab software. The influence of slag basicity and chemical compositions on the slag viscosity was obtained. The results show that there have insignificant effects on the slag viscosity when the slag basicity is over than 1.02, MgO content is less than 11.95% or TiO2 content is less than 12.57%. While the slag basicity can be influenced significantly with the slag basicity less than 1.02, MgO content over than 13.95% and TiO2 content over 13.57%. The Al2O3 content of the slag should be less than 12.75%.
1857
Showing 1 to 10 of 157 Paper Titles