Journal of Mechanical Research and Application: 1 (1)

Open Access Article

1 - An Investigation of the Different Temperature Changes in Carbon Nanotube Having Boundary Conditions into Steady Heat Flow Rate
سید علیرضا موسوی شیرازی

The carbon nanotubes are applied for boosting polymers, because the carbon nanotubes are so stronger than ordinary polymers, and have the greatest dimensions than the ordinary carbon fibers. Since carbon nanotubes have high irregular thermal conductivity, this issue is More

The carbon nanotubes are applied for boosting polymers, because the carbon nanotubes are so stronger than ordinary polymers, and have the greatest dimensions than the ordinary carbon fibers. Since carbon nanotubes have high irregular thermal conductivity, this issue is very important from the technological aspect of energy management. In these fluids or organic polymers combined with carbon nanotubes, matrix-nanotube connective is of specific importance. The results show that when one of the edges of the plate has a temperature boundary condition, the increment speed of the minimum temperature increases over time, and it requires 200 seconds for the heat to be conducted across the length of the plate. Also, in case two non-adjacent edges are of constant temperature boundary condition, the temperature of the region increases and grows on two sides of the plate symmetrically. The applied support in the plate can also be a compound of some types of simple and trapped supports. Manuscript profile

Open Access Article

2 - Examining some mechanical and physical properties of gold
Hassan Ghalami Bavil Olyaee Seyed Hamed Ghasemi Karar Nadhom Yasein

This article utilizes computational software to explore the characteristics of a gold lattice structured in a Face-Centered Cubic (FCC) arrangement. The investigation reveals a heat of formation for gold metal, calculated at 475.2972 kcal/mol, elucidating the energy req More

This article utilizes computational software to explore the characteristics of a gold lattice structured in a Face-Centered Cubic (FCC) arrangement. The investigation reveals a heat of formation for gold metal, calculated at 475.2972 kcal/mol, elucidating the energy required for the formation of one mole of gold from its constituent atoms. Infrared (IR) spectroscopy findings are also discussed, with green arrows indicating the normal modes of vibration for gold atoms within the FCC lattice at specific wavelengths. These arrows provide visual representations of the oscillation directions during each vibrational mode when exposed to infrared light. Furthermore, the article examines electronic properties, highlighting the HOMO and LUMO energy levels calculated at -11.61 eV and -7.94 eV, respectively. These levels denote the Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO), with negative signs indicating bonding orbitals that contribute to material stability. The energy difference of 3.67 eV between HOMO and LUMO influences various properties of gold, such as its electrical conductivity and band gap. Manuscript profile

Open Access Article

3 - Numerical investigation of performance and combustion of 16RK215 engine with hydrogen and diesel fuel mixture using reactive control compression ignition method.
Misagh Khadem fini Hossein Ghomashi

With the aim of improving the performance and emissions of the 16RK215 heavy diesel engine, the numerical simulation of hydrogen-diesel combustion was carried out on this engine with the new compression ignition method of reactive control. In the first phase, combustion More

With the aim of improving the performance and emissions of the 16RK215 heavy diesel engine, the numerical simulation of hydrogen-diesel combustion was carried out on this engine with the new compression ignition method of reactive control. In the first phase, combustion simulation is done with 100% diesel fuel, and after verification, in the second phase, dual fuel combustion simulation is done. With the aim of maximum use of hydrogen gas, two-fuel combustion simulation of reactive control compression ignition (RCCI) is carried out by using 70% of hydrogen gas with an equivalence ratio of 0.35 and diesel fuel with 30% of the total share of input fuel. Then, in each step, the amount of hydrogen decreases by 10% and the amount of diesel fuel increases by 10%. By increasing the amount of hydrogen, the results show that the maximum combustion pressure decreases and leads to an increase of about 5% of power. NOx, CO, SOOT are reduced due to poor or so-called lean mixture of fuel and incoming air. In the third phase, by keeping the amount of diesel fuel constant, the effect of the variable amount of hydrogen is checked, which increases the maximum combustion pressure and the temperature inside the chamber in the condition of constant injection of 40% diesel. In the condition of 80% hydrogen compared to 20% hydrogen, the amount of NOx pollutants increased by 90%, CO decreased by 61% and UHC decreased by 49%. Manuscript profile

Open Access Article

4 - A Deep Survey upon the Synthesis of AuS Nanostructures
Kourosh Motevalli Zahra Yaghoubi

In this research, the dendritic gold(I) sulfide nanostructures were successfully synthesized by a simple hydrothermal route. The effect of temperature , and reaction time, on the morphology and particle dimension was alsoinvestigated. Thus, the efficiency of synth More

In this research, the dendritic gold(I) sulfide nanostructures were successfully synthesized by a simple hydrothermal route. The effect of temperature , and reaction time, on the morphology and particle dimension was alsoinvestigated. Thus, the efficiency of synthesized gold sulfide nanostructures in thin-film solar cells was evaluated. The results indicated very well that the particle dimension and morphology have effect on solar cells efficiency and dendritic gold sulfide nano-structures have higher efficiency compared to sphericaland rod-like gold sulfide nanostructures. Moreover, depositing of dendritic gold sulfide upon gold sulfide nanoparticles led to obtaining 3.28% cell efficiency that in comparison with sole dendritic nanostructures and sole nanoparticles (1.89%), efficiency improvements of 48 and 85% were, respectively,obtained and also this important point must be elucidated that this nanostructures are useful for mechanical usages especially in manufacturing some linked rings in water treatment installations. Also, if we want to be decided for comparing with similar works presented for gold sulfide preparation [1–10],then, this fact will be illuminated easily that we synthesized dendritic gold sulfide nano-structures using new initiating reagents and without using surfactants by an easy route which can be more able in solar cells. Manuscript profile

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