Search results

Fluid-Structure-Interaction in Rocket Thrust Chambers Simulation and Validation M.C.
Introduction Generatively cooled rocket thrust chambers are extremly loaded structures.
The change from a perfect gas model (gas constants R = 349.2J/kgK and an isentropic exponent of κ = 1.4526) to a model with thermo-chemical nonequilibrium does not change the results to the experimental temperature level and confirms that frozen chemistry occurs between the windtunnel nozzle exit and the test specimen.
A time-adaptive fluid-structure interaction method for thermal coupling.
Thermal fluid structure interaction.

Wakihara 1, b 1 Department of Applied Chemistry, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan a jshiraka@o.cc.titech.ac.jp, bmwakihar@o.cc.titech.ac.jp Keywords: Li-ion battery, cathode, GITT, EXAFS Abstract Lithium diffusion properties of Li1-2yCo1+yVO4 (y = 0, 0.05, 0.1) with inverse spinel structure as cathode materials for a Li-ion battery were investigated in view of lithium vacancies.
Introduction As new cathode materials for lithium-ion batteries, LiMVO4 (M=Ni, Co) with an inverse spinel structure are attractive due to their high voltage behavior [1., 2.].
In our previous report [4.], it was shown that LiCoVO4 has cationic distribution with [V]8a[LiCo]16dO4 (subscripts 8a and 16d indicate the cation site of Fd3m symmetry) in the inverse spinel type structure.

XRD studies reveal that the ZnO films have a hexagonal wurtzite structure and they are highly oriented along (002) direction.
After deposition, thermal annealing process is an easy but critical post-treatment step to control the structural and properties by altering phases, crystallinity, electronic structure and phonon properties[6].
There is a strong diffraction peak (002) at 2θ=34°and a weak diffraction peak (103) at 2θ= 63°are observed in all ZnO thin films, indicating the polycrystalline hexagonal wurtzite structure with a preferred growth orientation along the (002) plane.
Rao, Zinc oxide ceramic semi-conductor gas sensor for ethanol vapour, Materials Chemistry and Physics, 64 (2000) 62-65

The presence of the rectifying curves at the a-C:N/p-Si junction indicates the hetero-junction behavior between the p-n structure and thus proves the successful doping of N doped a-C using the AACVD technique.
The average grain size was reported small for both samples, approximately 40~80nm to claim that the a-C thin film structure is nanostructured (less than 100nm).
Current density-voltage (J-V) graph for sample deposited at 600oC and 650oC (” indicates illuminated sample under AM-1.5 illumination (100mW/cm2) Conclusion As the conclusion, the nano-structured a-C thin films was obtained by using the newly designed Aerosol-assisted CVD method from the natural precursor camphor oil.
Pemble, Journal of Photochemistry and Photobiology A: Chemistry 219 (2010) 10

Chemistry of carbon nanotubes.
Carbon nanotube–polymer composites: chemistry, processing, mechanical and electrical properties.
Thin-Walled Structures, 148 (2020), 106591
Smart Materials and Structures, 21 (2012), 025018
Composite Structures, 93 (2011), 2419-2429

TG/DTA analysis is performed because there is correlation between cementitious activity and mineral phase or structure.
TG/DTA analysis indicates the mineral phase transition or structure change when temperature changes.
Moreover, the property reflects not only the chemistry of the hydration reaction but also physical effects such as water reduction and stacking.
Vibration style of micelle determinates the molecular vibration feature and molecular structure.
This reflect structure anisotropy[[]Xiandong Cong and R.

Generally speaking, matrix structure and purity are affected by alloy elements.
Effect of Extrusion Process Extrusion can improve alloy structure effective.
The strengthening phase Mg2Si dissolved α (Al) matrix, imbalance eutectic structure basically eliminated, acicular β (Al9Fe2Si2) α (Al12Fe3Si2) phase transformation.
This is due to the atomic diffusion easy in higher temperature, and alloy structure vacancy, dislocation defects repaired fast, so that the thermal conductivity performance improved.
From now on,we should go into the influence of chemistry component and the inner structure to thermal conductivity, and study further in the relationship between electric conductivity and thermal conductivity,then find the method of producing high thermal conductivity aluminum alloy to meet the requirements of all kinds of products with different thermal conductivity by combing optimizing component of aluminum alloy and processing technic.

CaCl2 (≥ 98 %; ACROS Organics), Na2CO3 (Latvian Chemistry), and ethanol (C2H5OH) were used without any further purification.
Pronounced absorption maximum at 3270 cm-1 indicates the presence of an OH group in the sample structure.
This maximum is typical of OH groups in the silk solution structure (see Fig. 2).
It can be concluded that temperature has influenced the structure (see Fig. 3 e to h).
Analogous samples but synthesized at 60 °C had the opposite structures.

Ti6Al7Nb [19] is another choice, yet the hazardous of aluminum is still an issue [9, 20] to solve this issue, alloying elements (b-stabilizing elements) were added to Ti, to transform the Ti hexagonal close-packed (a-phase) to a body-centered cubic beta structure (b-phase).
The strips were then cold rolled at room temperature to a thickness of ~1 mm (around 90% reduction ratio), then heat-treated at 900 °C for 30 min in a vacuum tube furnace in an argon atmosphere, followed by quenching in ice water to induce a full β-phase structure at room temperature (annealed sample).
It was reported earlier that the Ti-5% Mn has α + β structure and that above this percent the structure should have a β-phase only [25].
In this work, Ti-7wt.% Mn is still showing a co-existing mixture of α + β structure.
On the other hand, the structure of the cold rolled Ti-7 wt.% Mn showed a longitudinal grains aligned in the rolling direction.

The (XRD) analyses viewed that the films being the polycrystalline cadmium oxide, having a cubic structure with a film orientation (200) preferentially, and its response to (LPG) increased to (63%) at (1040 ppm) of (LPG) in the air at (673 K) by adding 1.5 at% Ga-doped [7].
The presence of structures, permeable, and cavities able to capture the amount of gas for a longer period may raise the efficiency of the detector or perhaps supports the detection in terms of the time required to detect [8].
The last relates to the diffraction plane (111) in structure.
Lokhande, Chemically deposited cubic structured CdO thin films: Use in liquefied petroleum gas sensor, Sensors and Actuators B: Chemical, 200 (2014) 245–250 [5] F.
[9] Cleveland, Ohio, CRC Handbook of Chemistry and Physics 1978