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Online since: May 2020
Authors: Viktor Moshynskyi, Yevhenii Malanchuk, Mykola Koziar, Zynovii Malanchuk, Valerii Korniienko
Information on the content and structure of man-made deposits were obtained using instrumental methods, physico-chemical and spectral analysis, geological exploration of deposits [22-24].
Accordingly, its colloids have a low diffusion rate, do not penetrate through the thin porosity membranes of cellular structures of life forms and are characterized by unbalanced solubility.
Calcium sulfate in the process of crystallization binds in its structure various impurities (phosphorus, fluorine, rare earths elements, halogen oxides).
Researches have established that the content of trace elements in man-made phosphorus germs depends on the distance of the structure to the object of contamination.
Research of the chemical composition of phosphogypsum dumps at PJSC “Rivneazot” was conducted at the Department of Chemistry at the National University of Water Management and Nature Resources Use.
Accordingly, its colloids have a low diffusion rate, do not penetrate through the thin porosity membranes of cellular structures of life forms and are characterized by unbalanced solubility.
Calcium sulfate in the process of crystallization binds in its structure various impurities (phosphorus, fluorine, rare earths elements, halogen oxides).
Researches have established that the content of trace elements in man-made phosphorus germs depends on the distance of the structure to the object of contamination.
Research of the chemical composition of phosphogypsum dumps at PJSC “Rivneazot” was conducted at the Department of Chemistry at the National University of Water Management and Nature Resources Use.
Online since: February 2016
Authors: Tamara Rudenko, Vladimir Lysenko, Sylvain Barraud, Yordan M. Georgiev, Alexei N. Nazarov
Georgiev3,4,5,
Vladimir Lysenko1, and Alexey Nazarov1,b
1 Institute of Semiconductor Physics, NASU, Prospect Nauki 45, 03028 Kyiv, Ukraine
2 CEA-LETI, MINATEC Campus, 17 rue des Martyrs, 38054 Grenoble, Cedex 9, France
3 Materials Chemistry & Analysis Group, Department of Chemistry and Tyndall National Institute, University College Cork, Cork, Ireland
4 AMBER@CRANN, Trinity College Dublin, Dublin 2, Ireland.
5 On leave of absence from the Institute of Electronics, Bulgarian Academy of Sciences, Sofia, Bulgaria
atamara@lab15.kiev.ua, bnazarov@lab15.kiev.ual
* the corresponding author
Keywords: Junctionless transistors, multi-gate MOSFETs, silicon-on-insulator (SOI), threshold voltage, flat-band voltage, doping concentration, mobility.
This led to the development of novel device structures, such as ultra-thin-film and multi-gate Silicon-On-Insulator (SOI) MOSFETs [1-5].
These advanced device structures feature enhanced electrostatic gate control over the channel potential and thereby better immunity to short-channel effects than conventional bulk Si devices.
We have applied both methods for the mobility investigation in planar and tri-gate NW JL device structures.
Zohta, Rapid determination of semiconductor doping profile in MOS structure, Solid-State Electron., vol. 16, (1973) 124-126
This led to the development of novel device structures, such as ultra-thin-film and multi-gate Silicon-On-Insulator (SOI) MOSFETs [1-5].
These advanced device structures feature enhanced electrostatic gate control over the channel potential and thereby better immunity to short-channel effects than conventional bulk Si devices.
We have applied both methods for the mobility investigation in planar and tri-gate NW JL device structures.
Zohta, Rapid determination of semiconductor doping profile in MOS structure, Solid-State Electron., vol. 16, (1973) 124-126
Online since: April 2020
Authors: Nurul Fitriyah, Ten Her Hong, Ha Thai Duy, Juinn Wei Mi, Yen Fu Hsiao, Jenh Yih Juang
Previous works reported that FeSe can be tangible in several phases such as the tetragonal α-FeSe phase,which has a similar structure with the PbO type, the hexagonal β-FeSe phase with a NiAs type structure, which has a wide range in terms of homogeneity, which shows the phase transformation occurrence from hexagonal to monoclinic, and the last being the FeSe2 with orthorhombic marcasite structure.
Mainly, this system has the same structure with the FeAs layer and the calculations of the band structure indicate that both FeSe and FeAs (iron-based arsenide) have a very similar Fermi surface structure [34].
Wu, Superconductivity in the PbO-type Structure α–FeSe, Proc.
Khasanov, Synthesis crystal structure and chemical stability of the superconductor FeSe1−x, Phys.
[48] “Magnetizability’, IUPAC Compendium of Chemical Terminology- The Gold Book (2nd edition), International Union of Pure and Applied Chemistry, 1997.
Mainly, this system has the same structure with the FeAs layer and the calculations of the band structure indicate that both FeSe and FeAs (iron-based arsenide) have a very similar Fermi surface structure [34].
Wu, Superconductivity in the PbO-type Structure α–FeSe, Proc.
Khasanov, Synthesis crystal structure and chemical stability of the superconductor FeSe1−x, Phys.
[48] “Magnetizability’, IUPAC Compendium of Chemical Terminology- The Gold Book (2nd edition), International Union of Pure and Applied Chemistry, 1997.
Online since: October 2013
Authors: Pragnesh N. Dave, Puneet R. Malpani
ZnO Nanoforest based New Generation Dye Sensitized Solar Cells
Pragnesh N Dave1,a, Puneet R Malpani2,b
1Department of Chemistry, Krantiguru Shyamji Krishna Verma Kachchh University,
Mundra Road, Bhuj (Gujarat), India
a pragneshdave@gmail.com, b malpanipuneet@gmail.com
Keywords: Dye Sensitized Solar Cells, Zinc Oxide, Photoanode, Metal Oxide.
The crystal structure, energy band gap, electron mobility and electron diffusion coefficient of both ZnO and TiO2 nanomaterial’s were summarized in Table 1 for comparison.
This approach mimics branched plant structures with the objective to capture more sunlight.
The combination of multiple LG and BG steps can be applied for more complex hierarchical ZnO NW structuring.
The difference in band structure results in a different density of states and, possibly, different electronic coupling strengths with the adsorbate.
The crystal structure, energy band gap, electron mobility and electron diffusion coefficient of both ZnO and TiO2 nanomaterial’s were summarized in Table 1 for comparison.
This approach mimics branched plant structures with the objective to capture more sunlight.
The combination of multiple LG and BG steps can be applied for more complex hierarchical ZnO NW structuring.
The difference in band structure results in a different density of states and, possibly, different electronic coupling strengths with the adsorbate.
Online since: February 2012
Authors: Saleh Alkahtani
SALEH ALKAHTANI
Industrial Engineering Program, Mechanical Engineering Department, College of Engineering, Salman bin Abdulaziz University, Al Kharj, KSA
salqahtany@hotmail.com
Keywords: Metallurgical Parameters, Heat treatment (T5 and T6), Mechanical Properties, 319 Al-Si Alloys, DOE Experimental Correlations
Abstract In this work, the effect of metallurgical parameters (i.e. alloy chemistry and aging parameters) on the mechanical properties of 319 alloys was investigated, with the aim of adjusting these parameters to produce castings of suitable mechanical properties.
The solution treatment homogenizes the cast structure and minimizes segregation of alloying elements in the casting.[1] Silicon particles undergo fragmentation, necking, spheroidization, and coarsening, β-Fe needles gradually undergo necking and fragmentation, while the α-Fe Chinese script particles are not affected. [2] Due to their compact form, the α-Fe-intermetallics are less harmful to the mechanical properties and, hence, preferable to the β-Fe in the casting microstructure.
Optical and SEM micrographs taken from as-cast primary and secondary 319 alloys, showing the structure of as cast 319 alloys: (a, b) primary 319 Alloy G, (c) Alloy GM, showing the structure of as cast 319 alloys (A: Al2Cu; B: Al5Mg8Si6Cu2) , and (d) secondary 319 Alloy W.
[9] Crepeau, P.N., Antolovich, S.D. and Worden, J.A., “Structure-Property Relationships in Aluminium Alloy 339-T5: Tensile Behavior at Room and Elevated Temperature”, AFS Transactions, Vol. 98, pp. 813-822, (1990)
The solution treatment homogenizes the cast structure and minimizes segregation of alloying elements in the casting.[1] Silicon particles undergo fragmentation, necking, spheroidization, and coarsening, β-Fe needles gradually undergo necking and fragmentation, while the α-Fe Chinese script particles are not affected. [2] Due to their compact form, the α-Fe-intermetallics are less harmful to the mechanical properties and, hence, preferable to the β-Fe in the casting microstructure.
Optical and SEM micrographs taken from as-cast primary and secondary 319 alloys, showing the structure of as cast 319 alloys: (a, b) primary 319 Alloy G, (c) Alloy GM, showing the structure of as cast 319 alloys (A: Al2Cu; B: Al5Mg8Si6Cu2) , and (d) secondary 319 Alloy W.
[9] Crepeau, P.N., Antolovich, S.D. and Worden, J.A., “Structure-Property Relationships in Aluminium Alloy 339-T5: Tensile Behavior at Room and Elevated Temperature”, AFS Transactions, Vol. 98, pp. 813-822, (1990)
Online since: July 2024
Authors: Mohamed Mounis Alim, Abdelyamine Naitbouda, Rabah Tadjine
The X-ray diffraction analysis revealed that substrate voltage Vs affects essentially the structure and size of the formed crystallites.
This ratio is largely correlated with the structure and properties of deposited films [20].
[10] Eiji Kusano, Structure-Zone Modeling of Sputter-Deposited Thin Films: A Brief Review, Appl.
Singh, Influence of magnetron configurations on the structure and properties of room temperature sputtered ZnO thin films, Phys.
Auciello, Effect of pretreatment bias on the nucleation and growth mechanisms of ultra nanocrystalline diamond films via bias-enhanced nucleation and growth: An approach to interfacial chemistry analysis via chemical bonding mapping, J.
This ratio is largely correlated with the structure and properties of deposited films [20].
[10] Eiji Kusano, Structure-Zone Modeling of Sputter-Deposited Thin Films: A Brief Review, Appl.
Singh, Influence of magnetron configurations on the structure and properties of room temperature sputtered ZnO thin films, Phys.
Auciello, Effect of pretreatment bias on the nucleation and growth mechanisms of ultra nanocrystalline diamond films via bias-enhanced nucleation and growth: An approach to interfacial chemistry analysis via chemical bonding mapping, J.
Online since: September 2013
Authors: Noor A. Ahmed, J.R. Page
DESIGN
Wing structure was designed to sustain the load having a load factor of 3.8.
Wing Layout The design weight of printable UAV is 3 kg which is quite light, thus complex internal structures such as spars and ribs are not widely used in our case.
Moreover, unlike other fabrication methods, SLS does not require support structures during the forming process as the unused powdered material that surrounds the part provides support.
The EOSINT P 730 (Fig. 5) was used for printing the entire UAV structure Fig. 5 EOSINT M 270 3D Printer The final test model manufactured was then used in wind tunnel testing (Fig. 6).
ISBN: 978-953-7619-81-7 [58] Lien, J. and Ahmed N.A., Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality, Chap. 20, Mazzeo, N.
Wing Layout The design weight of printable UAV is 3 kg which is quite light, thus complex internal structures such as spars and ribs are not widely used in our case.
Moreover, unlike other fabrication methods, SLS does not require support structures during the forming process as the unused powdered material that surrounds the part provides support.
The EOSINT P 730 (Fig. 5) was used for printing the entire UAV structure Fig. 5 EOSINT M 270 3D Printer The final test model manufactured was then used in wind tunnel testing (Fig. 6).
ISBN: 978-953-7619-81-7 [58] Lien, J. and Ahmed N.A., Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality, Chap. 20, Mazzeo, N.
Online since: July 2014
Authors: Noor A. Ahmed, K.J. Netto
The internal blade structure which consists of the leading edge and ribs were made of REN Shape material and the support arms were made of Aluminium.
Fig 2: Assembling of Leading Edge and Ribs and Joining of Skin to Blade Structure The next task that was carried out was the joining of the skin to the blade structure, Fig 3.
To ensure that the skin sticked properly to the structure, clamps were used and left overnight so that the glue could take its full effect.
This had to be done to avoid gaps in between the skin and the structure when joining them.
[6]Lien, J. and Ahmed N.A., Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality, Chap. 20, Mazzeo, N.
Fig 2: Assembling of Leading Edge and Ribs and Joining of Skin to Blade Structure The next task that was carried out was the joining of the skin to the blade structure, Fig 3.
To ensure that the skin sticked properly to the structure, clamps were used and left overnight so that the glue could take its full effect.
This had to be done to avoid gaps in between the skin and the structure when joining them.
[6]Lien, J. and Ahmed N.A., Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality, Chap. 20, Mazzeo, N.
Online since: September 2024
Authors: Tatjana Charkova, Vytautas Taurelė
The alkaline media is more favorable for tin oxide-covered structures [37].
Acknowledgments The authors acknowledge Audrius Drabavičius from the Department of Characterisation of Materials Structure for HR-TEM recordings.
Dutta, Synthesis of Au/SnO2 core shell structure nanoparticles by a microwave-assisted method and their optical properties, J.
Luo, et al., Novel multi-layered SnO2 nanoarray: self-sustained hydrothermal synthesis, structure, morphology dependence and growth mechanism, Cryst.
Cheng, Fabrication of a Au@SnO2 core–shell structure for gaseous formaldehyde sensing at room temperature, Sens.
Acknowledgments The authors acknowledge Audrius Drabavičius from the Department of Characterisation of Materials Structure for HR-TEM recordings.
Dutta, Synthesis of Au/SnO2 core shell structure nanoparticles by a microwave-assisted method and their optical properties, J.
Luo, et al., Novel multi-layered SnO2 nanoarray: self-sustained hydrothermal synthesis, structure, morphology dependence and growth mechanism, Cryst.
Cheng, Fabrication of a Au@SnO2 core–shell structure for gaseous formaldehyde sensing at room temperature, Sens.
Online since: October 2015
Authors: Derval dos Santos Rosa, José Ricardo Nunes de Macedo
Reinforcement of composites with natural fibers to increase tensile strength and impact resistance can also alter the surface and structure of the material, which can change the matrix degradation process.
Among the factors that influence degradation of the material and adhesion of microorganisms in the biotic degradation process, we can cite the chemical structure of the polymer and its surface.
Regarding the chemical structure, the regions of lesser organization of the chains have faster degradation, so that amorphous PLA is more degradable.
Macromolecular Chemistry and Physics. 2011;212(11):1147-54
Effect of "core-shell" polymeric nanofiller on the structure and properties of polylactide and thermoplastic corn starch blend.
Among the factors that influence degradation of the material and adhesion of microorganisms in the biotic degradation process, we can cite the chemical structure of the polymer and its surface.
Regarding the chemical structure, the regions of lesser organization of the chains have faster degradation, so that amorphous PLA is more degradable.
Macromolecular Chemistry and Physics. 2011;212(11):1147-54
Effect of "core-shell" polymeric nanofiller on the structure and properties of polylactide and thermoplastic corn starch blend.