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Online since: August 2013
Authors: Bei Zhang, Pan Jun Du, Ying Yu Liang, Yue Jun Fei, Hui Zhang
Thermohaline structure, diffusion and transportation of nutrient are controlled by the changes of the complex currents in waters, which are crucially impact on the primary productivity and ecological structure of the waters.
Data and analysis methods 1.1 Study area and stations 15 sections, 91 ocean chemistry stations and 8 phy-oceanography potential standard stations were conducted in Zhejiang and Fujian waters (Lon. 120°–128°E, Lat. 26°–30°N) from July, 2006 to August, 2007, four times each up to 30 days, The multi-disciplinary including physical oceanography, marine meteorological, marine chemical and marine biological comprehensive industry survey was carried on in spring(April 8 to May 21, 2007), summer(July 15 to August 21, 2006), autumn(October 18 to December 16, 2007), winter(December 23,2006 to February 2, 2007)respectively.
Many current systems intersect in Zhejiang and Fujian waters with constraints and influence to each other, which control the thermohaline structure and distribution of DO content.
In summary, interaction of CDW, the Yangtze River diluted water, Fujian and Zhejiang coastal current, Taiwan warm current, Kuroshio, Yellow sea water masses, and upwelling current is the key physical process for the formation of Fujian and Zhejiang Sea thermohaline structure and the distribution of DO content in Fujian and Zhejiang waters.
Data and analysis methods 1.1 Study area and stations 15 sections, 91 ocean chemistry stations and 8 phy-oceanography potential standard stations were conducted in Zhejiang and Fujian waters (Lon. 120°–128°E, Lat. 26°–30°N) from July, 2006 to August, 2007, four times each up to 30 days, The multi-disciplinary including physical oceanography, marine meteorological, marine chemical and marine biological comprehensive industry survey was carried on in spring(April 8 to May 21, 2007), summer(July 15 to August 21, 2006), autumn(October 18 to December 16, 2007), winter(December 23,2006 to February 2, 2007)respectively.
Many current systems intersect in Zhejiang and Fujian waters with constraints and influence to each other, which control the thermohaline structure and distribution of DO content.
In summary, interaction of CDW, the Yangtze River diluted water, Fujian and Zhejiang coastal current, Taiwan warm current, Kuroshio, Yellow sea water masses, and upwelling current is the key physical process for the formation of Fujian and Zhejiang Sea thermohaline structure and the distribution of DO content in Fujian and Zhejiang waters.
Online since: June 2022
Authors: Gunji Venkata Punna Rao, S. Nallusamy, R.T. Chander
AMCs are good enough to develop structures with high stiffness, dimensional stability, and exceptional wear resistance [12-14].
They are cohesive structures made by physically combining two or more compatible materials, different in composition and characteristics and sometimes in the form [17-20].
Squeeze casting H-13 die steel was used due to high-temperature hardness, toughness, resistance especially, and a high degree of purity with homogeneous bond structure [36, 37].
Results reveal that, well grain structure was found owing to cooling rate raises and effective stirring action also results in consistent sharing of particles to improve the specimen mechanical properties.
Kannarasu et al., Experimental analysis on reinforced aluminium metal matrix with boron carbide, graphite and fly ash composites, Rasayan Journal of Chemistry. 10(4) (2017) 1368-1373
They are cohesive structures made by physically combining two or more compatible materials, different in composition and characteristics and sometimes in the form [17-20].
Squeeze casting H-13 die steel was used due to high-temperature hardness, toughness, resistance especially, and a high degree of purity with homogeneous bond structure [36, 37].
Results reveal that, well grain structure was found owing to cooling rate raises and effective stirring action also results in consistent sharing of particles to improve the specimen mechanical properties.
Kannarasu et al., Experimental analysis on reinforced aluminium metal matrix with boron carbide, graphite and fly ash composites, Rasayan Journal of Chemistry. 10(4) (2017) 1368-1373
Online since: February 2025
Authors: Surya Lubis, Irfan Mustafa, Sheilatina Sheilatina, Wilda Rahmi
Synthesis of Activated Carbon/ZnO Nanocomposite Using Melinjo (Gnetum gnemon) Seed Shells for Enhanced Photocatalytic Degradation of Chlorpyrifos Pesticide
Surya Lubis1,a*, Irfan Mustafa1,b, Sheilatina1,c and Wilda Rahmi1,d
1Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Darussalam 23111, Banda Aceh Indonesia
asuryalubis@usk.ac.id, bIrfan.musta@usk.ac.id, csheilatina@usk.ac.id, wildarahmi799@gmail.com
Keywords: ZnO, activated carbon, nanocomposite, Gnetum gnemon, Persea americana, degradation, chlorpyrifos
Abstract.
Fig. 1 Molecular structure of chlorpyrifos Experimental Materials Zn(NO3)2.6H2O (reagent grade, 98%) was purchased from Sigma Aldrich, while hydrochloric acid (HCl) 25% extra pure, sodium hydroxide (NaOH) pellets for analysis, and ethanol 96% were bought from Merck.
The obtained peaks matching with the Crystalography Open Database (COD) number 96-901-41663, confirming to the formation of zincite phase ZnO with a hexagonal structure [31, 32].
The XRD pattern of activated carbon shows a broad peak at 2q angles at around 21-26° corresponds to activated carbon plane (002) of the disordered graphite, which is common for the structure of an activated carbon confirmed to be amorphous phases [32].
The activated carbon has a layered structure with irregular shape.
Fig. 1 Molecular structure of chlorpyrifos Experimental Materials Zn(NO3)2.6H2O (reagent grade, 98%) was purchased from Sigma Aldrich, while hydrochloric acid (HCl) 25% extra pure, sodium hydroxide (NaOH) pellets for analysis, and ethanol 96% were bought from Merck.
The obtained peaks matching with the Crystalography Open Database (COD) number 96-901-41663, confirming to the formation of zincite phase ZnO with a hexagonal structure [31, 32].
The XRD pattern of activated carbon shows a broad peak at 2q angles at around 21-26° corresponds to activated carbon plane (002) of the disordered graphite, which is common for the structure of an activated carbon confirmed to be amorphous phases [32].
The activated carbon has a layered structure with irregular shape.
Online since: July 2007
Authors: Willam S. Miller, Menno van der Winden, Cheng Liu, Johnson Go
With Roll-it, it is now possible to predict
microchemistry, grain structure, and degree of recrystallization at any given point during the
fabrication process.
Furthermore, the model framework is not limited for specific alloy-producer combinations, allowing users to implement the models in accordance with their specific alloy chemistries and production installations.
Fig. 1 shows a schematic outline of the overall structure of Roll-it.
A schematic outline of the structure of Roll-it.
The as-deformed materials were subsequently annealed at 400°C for 1 hour in order to attain a fully recrystallized structure as predicted by Roll-it.
Furthermore, the model framework is not limited for specific alloy-producer combinations, allowing users to implement the models in accordance with their specific alloy chemistries and production installations.
Fig. 1 shows a schematic outline of the overall structure of Roll-it.
A schematic outline of the structure of Roll-it.
The as-deformed materials were subsequently annealed at 400°C for 1 hour in order to attain a fully recrystallized structure as predicted by Roll-it.
Online since: December 2024
Authors: Rozana Azrina Sazali, Azlinda Azizi, Kenneth Stuart Sorbie, Nur Batrisyia Razman Shah, Munawar Khalil
The Role of Surfactant on The Nanoparticle-Modifiers in Facilitating Scale Inhibition
Nur Batrisyia Razman Shah1,a, Rozana Azrina Sazali1,b*,
Kenneth Stuart Sorbie2,3,c, Munawar Khalil4,d, Azlinda Azizi1,e
1School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
2Flow Assurance and Scale Team, Institute of GeoEnergy Engineering, Heriot-Watt University, Edinburgh EH14 4AS, Scotland UK
3School of Energy, Geoscience, Infrastructure and Society (EGIS), Heriot-Watt University, Edinburgh EH14 4AS, Scotland UK
4Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, West Java, Indonesia
a2020259492@student.uitm.edu.my, *brozana592@uitm.edu.my, cK.Sorbie@hw.ac.uk, dm.khalil@sci.ui.ac.id, eazlinda68@uitm.edu.my
Keywords: dispersion; nanoparticles; surfactant; scale inhibition; SDS
Abstract.
This is because graphene's structure is more sheet-like as shown in Figure 3.
Graphene oxide features oxygen-containing groups like carboxyl, hydroxyl, and epoxy, attached to both the flat surfaces (basal planes) and edges of its graphene sheets, this unique structure results in a higher presence of sp3 hybridized carbon atoms compared to sp2, granting GO distinct mechanical, chemical, and optical properties [15].
Table 2 Zeta potential and particle size of different NPs at 100 and 300 ppm GO MWCNT SiO2 Fe3O4 100 ppm 300 ppm 100 ppm 300 ppm 100 ppm 300 ppm 100 ppm 300 ppm Zeta Potential (mV) -115 -116 -93.6 -93 -61.5 -73.7 -81.6 -77.8 Particle Size (d.nm) 131 183.4 198.3 327.2 114.2 36.2 118.2 223.1 Fig. 3 Structure of GO (left) and MWCNT (right) [21] Fig. 4 Adsorption of SDS onto sheet-like structure of GO Dispersed NPs In Inhibiting Scales.
This is because graphene's structure is more sheet-like.
This is because graphene's structure is more sheet-like as shown in Figure 3.
Graphene oxide features oxygen-containing groups like carboxyl, hydroxyl, and epoxy, attached to both the flat surfaces (basal planes) and edges of its graphene sheets, this unique structure results in a higher presence of sp3 hybridized carbon atoms compared to sp2, granting GO distinct mechanical, chemical, and optical properties [15].
Table 2 Zeta potential and particle size of different NPs at 100 and 300 ppm GO MWCNT SiO2 Fe3O4 100 ppm 300 ppm 100 ppm 300 ppm 100 ppm 300 ppm 100 ppm 300 ppm Zeta Potential (mV) -115 -116 -93.6 -93 -61.5 -73.7 -81.6 -77.8 Particle Size (d.nm) 131 183.4 198.3 327.2 114.2 36.2 118.2 223.1 Fig. 3 Structure of GO (left) and MWCNT (right) [21] Fig. 4 Adsorption of SDS onto sheet-like structure of GO Dispersed NPs In Inhibiting Scales.
This is because graphene's structure is more sheet-like.
Online since: December 2024
Authors: Sufriadin Sufriadin, Munahruddin Munahruddin, Irzal Nur
Serpentine has a mesh structure within the olivine crystals.
They form an intercumulus structure between olivine crystals.
Serpentine crystals are also found in veins between olivine and pyroxene mesh structures.
Serpentines are filling fractures between olivine and pyroxene as vein and mesh structures.
Chemistry data and lithology are fundamental in fractionation analysis.
They form an intercumulus structure between olivine crystals.
Serpentine crystals are also found in veins between olivine and pyroxene mesh structures.
Serpentines are filling fractures between olivine and pyroxene as vein and mesh structures.
Chemistry data and lithology are fundamental in fractionation analysis.
Online since: January 2022
Authors: Sulaiman Wafi, Hazem Abuorf
To stem the issue, renders have been sought to protect the structure when the latter being exposed to the rainfall.
The approach suggested here seeks through the minerals to be found naturally in fruits’ and vegetables’ waste, and in the dissolved in water, to further stimulate a chemical reaction through the surface areas of the minerals, or the ‘surface’s chemistry’ (Morse, 1986).
Beside time factor, minerals remain effective in binding the particles towards a cohesive structure. 4 CONCLUSIONS The question at stake and set in the title of this article questions concerns whether we do need mortar to repair rammed-earth walls.
However, as this study argues, additives on their own remain insufficient and this study endorses the argument for using minerals as additive while keeping an eye on every stage of the unstabilized rammed-earth structure, ranging from constructing the formwork, mixing and molding the soil mixture to curing. 5 ACKNOWLEDGMENTS I wish to thank the Palestinian American Research Centre for its contribution to a funded-research project which has enabled me to go further into my research.
Modern Earth Buildings - Weathering and durability of earthen material and structures, Materials, Engineering, Constructions and Applications 11, 282-303 [16] Onyelowe C. 2019.
The approach suggested here seeks through the minerals to be found naturally in fruits’ and vegetables’ waste, and in the dissolved in water, to further stimulate a chemical reaction through the surface areas of the minerals, or the ‘surface’s chemistry’ (Morse, 1986).
Beside time factor, minerals remain effective in binding the particles towards a cohesive structure. 4 CONCLUSIONS The question at stake and set in the title of this article questions concerns whether we do need mortar to repair rammed-earth walls.
However, as this study argues, additives on their own remain insufficient and this study endorses the argument for using minerals as additive while keeping an eye on every stage of the unstabilized rammed-earth structure, ranging from constructing the formwork, mixing and molding the soil mixture to curing. 5 ACKNOWLEDGMENTS I wish to thank the Palestinian American Research Centre for its contribution to a funded-research project which has enabled me to go further into my research.
Modern Earth Buildings - Weathering and durability of earthen material and structures, Materials, Engineering, Constructions and Applications 11, 282-303 [16] Onyelowe C. 2019.
Online since: September 2008
Authors: Pierre Steinmetz, Laurent Royer, Christophe Liebaut, Stéphane Mathieu
A candidate which combines good oxidation behaviour and very close crystallographic structure with regard to the matrix is NiAl.
At ambient temperature, the theoretical lattice misfit between the two close structures of Cr (A2) and NiAl (B2) is around 0.1%.
Fig. 1 shows the structure of three as cast Cr-Ni-Al alloys.
Eutectic structure is localized in the interdendritic spaces.
Beyond this limit, the structure of the alloy is not affected by oxidation.
At ambient temperature, the theoretical lattice misfit between the two close structures of Cr (A2) and NiAl (B2) is around 0.1%.
Fig. 1 shows the structure of three as cast Cr-Ni-Al alloys.
Eutectic structure is localized in the interdendritic spaces.
Beyond this limit, the structure of the alloy is not affected by oxidation.
Online since: June 2025
Authors: Ngo Van Tai, Naphatrapi Luangsakul
In contrast to a model system including a combination of starch and phenolics in a gel [8], specialized foods that possess a certain structure and form can exhibit a variable release of phenolics [8, 9].
They are utilized to assess processes without any prior knowledge of the system's structure or dependencies Additionally, they have been adapted as a tool in computer-aided diagnostics [10, 12].
Due to the change in the natural crystalline and granular structure, the pregelatinzed sample in general has more ability to digest than the control sample [15].
However, other treatments such as annealing, heat moisture treatment, microwave, and sonication could lead to the starch structure becoming more compact and difficult to hydrolysis by amylolytic enzyme [16].
Xiang, Li J., Lin Q., Zhang Y., Ding Y., Guo X., Pan Q., Liu Q., Fu X., Yang Y., Han W. and Fang Y.: Food Chemistry: X Vol. 19 (2023) p. 100785
They are utilized to assess processes without any prior knowledge of the system's structure or dependencies Additionally, they have been adapted as a tool in computer-aided diagnostics [10, 12].
Due to the change in the natural crystalline and granular structure, the pregelatinzed sample in general has more ability to digest than the control sample [15].
However, other treatments such as annealing, heat moisture treatment, microwave, and sonication could lead to the starch structure becoming more compact and difficult to hydrolysis by amylolytic enzyme [16].
Xiang, Li J., Lin Q., Zhang Y., Ding Y., Guo X., Pan Q., Liu Q., Fu X., Yang Y., Han W. and Fang Y.: Food Chemistry: X Vol. 19 (2023) p. 100785
Online since: June 2019
Authors: Milan Brandt, Muhammad Musaddique Ali Rafique, Stephen Niezgoda
Brazhkin, V.V., Metastable phases, phase transformations, and phase diagrams in physics and chemistry.
Janot, C., The structure of quasicrystals.
Materials Chemistry and Physics, 2005. 93(1): p. 174-177
Stobbs, The structure of shear bands in metallic glasses.
Gilbert, A., Introduction to Computational Quantum Chemistry: Theory.
Janot, C., The structure of quasicrystals.
Materials Chemistry and Physics, 2005. 93(1): p. 174-177
Stobbs, The structure of shear bands in metallic glasses.
Gilbert, A., Introduction to Computational Quantum Chemistry: Theory.