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The burner uses the structure of cylindrical pipe, which choose the Al2O3 material.
As the diameter of the ball changes, the porous media porosity also changes, which brings the variable pore structure in the experiment.
In this experiment, there are three different porosity structures, and the uniform porosity is as follows: 0.32 0.40 0.45.Two-stratified porous media structure was realized by dividing from the middle of the wall, and then filled with different diameter ball.
This paper has a study of three different two-stratified porous media structure.
As also Fig.3 shows，When the structure and gas flux do not change，the burning characteristics change after the variation of porosity.

That is why it seems viable to discuss the applicability of the models and characterizing parameters valid for the known ordered structures of the granule-balls to such multi-dimensional structures (real loadings).
As to formal structuring of the granular media, the problem of providing a model (statistically average) structure of similar loadings is quite reasonable despite the completely chaotic allocation of the granule-balls in the balls loading; the model should be oriented towards some artificially ordered structure of a poly-ball medium (Table 1).
According to the data in Table 1, these are N=8 with γ=0.605 and ω=0.395 (structure with SR cells), N=10 with γ=0.698 and ω=0.302 (structure with R cells), N=12 with γ=0.74 and ω=0.26 (structure with RD cells and/or SRD cells).
Sandulyak, Magneto-filtration purification of liquids and gases, Moscow: Chemistry. 1988, pp. 133
Jiang, Pore structure of ore granular media by computerized tomography image processing, J.

They are represented as a number of radiation bands with peaks related to different kinds of luminescence centers, such as admixtures of Al, Ge, Na, Li, or intrinsic defects of quartz’s structure.
Ultraviolet section of XRL1 spectrum contains a few superposed bands given by different centers, related to admixtures or intrinsic imperfections of mineral’s structure, which react to X-raying duration time changes in different ways.
Lutoev, Genetic and material scientific meaning of structural defects of crystalline quartz, Minerals and minerogenesis, structure, diversity and evolution of mineral world, role of minerals in origin and evolution of life, biomineral interactions, Geoprint, Syktyvkar (in Russian), 2008, pp. 124-189
Boroznovskaya, Role of calcination and repeated X-raying in luminescent study of natural quartz, XVIII International Conference on Crystal Chemistry, X-ray Diffraction and Spectroscopy of Minerals, IGG UB RAS, Ekaterinburg (in Russian), 2014, pp. 74-75

Preparation and Properties of Magnesium-Aluminum Matrix Composites Reinforced with Silicon Carbon Particles Tanwei Zhou, Xiangrong Liua, Runlan Zhang, Zhuangzhuang Su College of Chemistry and Chemical Engineering, Xi’an University of Science &Technology, Xi’an, 710054, P.
The Al4C3 phase has a crystal structure closer to that of Mg than to that of SiC, which can be act as a potential nucleant for Mg-5wt.
This is duo to Al4C3 phase (rhombohedral but indexed in a hexagonal unit cell, a=0.3331nm, b=0.3331nm, c=2.4990nm) has a crystal structure that is much closer to that of Mg (hexagonal, a=0.3210nm, b=0.3210nm, c=0.5210nm) than to that of SiC (hexagonal a=0.3070nm, b=0.3070nm, c=23.4170nm).
From the point of view of crystal structure, Al4C3 is a more suitable nucleant for the nucleation of α-Mg than SiC.

The structure and morph- ology of composites were characterized by Fourier-transform infrared spectra (FTIR), thermo- gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscope (SEM).
This is primarily because they combine the merits of conducting polymers and inorganic nanoparticles, and have wide potential applications in diverse areas such as chemistry, physics, electronic, optics, materials, and biomedical science [1–4].
The morphological, structure ,thermal and electrical properties of PANI/ZrO2 composite were investigated using FTIR, TGA, XRD, SEM and four-probe data. 1 Experiment 1.1 Materials Aniline (ANI, Shanghai Chemical Works, China) was used as the monomer and was purified by double distillation under reduced pressure.
The typical XRD pattern of ZrO2 nanoparticles presents the baddeleyite structure with no extra reflections (Fig.3(a)), and it perfectly indexed to (110), (ī11), (111), (200), (ī12), (022) and (122) crystal plane of monoclinic ZrO2(JCPDS Card No. 37-1484).

The austenite grain structure was correlated to the dispersive properties of Nb atom clustering and precipitation.
However, the other three schedules have shown the gradual decrease in stress after reaching a maximum, which corresponds to the optically observed equaxed grain structures (Fig. 1, d, e, f) and is an indicative of the dynamic recrystallisation.
Fig. 2 Typical (a) SEM image of precipitates for “1100 °C reheating + 1075 °C deformation” TMP schedule and (b) EDS spectra of a TiNb-rich particle; (c)- particle size distributions Table 1 Summary of the parameters for TiNb- and Nb-rich precipitates Re-heating temperature [°C] 1100 1250 Deformation temperature [°C] 1075 975 1075 975 Particle size range [nm] < 70 >70 < 70 >70 < 70 >70 < 70 >70 Number density [mm-2] 3.13 0.13 12.06 0.21 2.05 0.21 2.75 0.31 Average diameter [nm] 26 96 22 107 29 92 29 84 Chemistry [%] Nb 57 0 80 0 30 40 50 20 Nb-Ti 43 100 20 100 70 60 50 80 The APT study of atom clusters has shown presence of C clusters, Nb clusters and Nb-C clusters of varying composition (Fig. 3) for all the four TMP conditions.
The number densities of Nb clusters, Nb-C clusters and Nb-rich particles all increased with a decrease in deformation temperature, which can be related to an increase in the time available for precipitation. 20 nm 10 nm 10 nm (a) (b) (c) (d) Fig. 3 (a) Carbon atom map and selected atom maps showing (b) Nb clusters and (c) Nb-C clusters (Nb - large and C - small spheres); (d) dependence of Nb-C cluster composition on cluster size (all for “1100 °C reheating + 1075 °C deformation” TMP schedule) Partial recrystallisation of the austenite grain structure was observed for the TMP condition (1250°C reheating + 975 °C deformation) when the matrix was enriched with Nb solute atoms, the number densities of Nb and Nb-C clusters were high and this of the Nb-rich particles was low.

After immersion in acidic solution, impregnation with nickel and molybdenum were conducted to introduce active metal of nickel (Ni) and molybdenum (Mo) in the support structure.
Composition of element of the produced catalyst before and after impregnation (EDX analysis) Assessment on the catalyst crystallinity (with XRD analysis) confirmed catalyst structure has been dominantly porous.
Reduction of surface area after impregnation is a typical phenomenon as evidence of metal insertion in the support structure.
[10] A Herbst, C Janiak, Selective Glucose Conversion to 5 HMF instead of Levulinic Acid with MIL-Cr MOF-Derivatives, New Journal of Chemistry Vol.40 Issue 9 (2016).

One Pot Green Synthesis of Gold Nanoparticles Using Piper Betle Leaf Extract and their Antibacterial Activities Harekrishna Bar Department of Chemistry, Sabang Sajanikanta Mahavidyalaya, Lutunia, Paschim Medinipur, West Bengal 721166, India bar.krishna1981@gmail.com Keywords: piper betle, gold nanoparticles, green synthesis, antibacterial activity, MIC.
With the reference of standard diffraction data of JCPDS–ICDD 1999, it confirmed the face centered cubic structures of synthesized gold nanoparticles.
I acknowledge the support provided by Department of Chemistry and USIC, Vidyasagar University for characterization.
Ajay Kumar Misra, Professor, Department of Chemistry, Vidyasagar University.

Isotherm and Kinetic Adsorption of Malachite Green Using Low-Cost Adsorbent of Coal Fly Ash Nadratun Nikmah1,a, Roto Roto1,b and Mudasir Mudasir1,c* 1Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara P.O.
The determination of MG concentration in the solution before and after adsorption was carried out using a UV-VIS spectrophotometer at the Laboratory of Analytical Chemistry, Gadjah Mada University.
Eddy, Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves, J.
Liu, Feasible synthesis of coal fly ash based porous composites with multiscale pore structure and its application in Congo red adsorption, Chemosphere 298 (2022) 134136

SnO2, ZnO, WO3 are paid more attention since they have the characteristics of simplicity in fabrication, high sensitivity and all kinds of morphology and structure of gas sensitive materials such as nanowires, nanorods, nano ring have been successfully synthesized.
Research progress of the application of electronic nose for analysis of the quality of agricultural products Detection of quality of agricultural products based primarily on the analysis of physic and chemistry,character,trait,biology and sensory experiments.Sensory evaluation and chemical analysis is the main method of evaluation of the quality of agricultural products.
(1)Light addressable potentiometric sensor is a new type of semiconductor device.The working principle is to become sensitive to potential changes between electrolyte solution and insulating layer.It uses SPT surface photovoltaic technology to get chemistry image.These images is very similar to biological olfaction electrical diagram,and makes the sensor more miniaturized and integrated
,C.S.Xie,et al.Spoiling and formaldehyde-containing detections in octopus with an electronic nose[J].Food Chemistry,2009,113(4):1346-1350