Natural gas and liquefied petroleum gas are the most important alternative fuels for gasoline in spark ignition engines, for many reasons, such as large world reserve of these gasses, high heating value, high octane number, low emissions emitted from burning them in engines, and their small prices compared with gasoline. The practical study conducted with these two fuels to operate single cylinder with variable compression ratio, speed and spark timing Ricardo E6/US, and its performance was compared with that resulted from running the engine with gasoline. The results appeared that the HUCR (higher useful compression ratio) for gasoline was 8:1, 10.5:1 for LPG and 13:1 for natural gas. Results appeared that spark timing was advanced when using NG more than other used fuels, because of its low flame speed propagation. The study conducted that brake power of LPG and NG were less than that for gasoline at CR=8:1, but they became closer when the engine operated at HUCR for each fuel. The results showed that specific fuel consumption for NG less than that for LPG, which was less than that for gasoline on a mass basis. Also, the exhaust gas temperature for NG was found to be less than LPG, and it was for LPG less than that for gasoline.

Tests were conducted to investigate the influence of using nanomaterials in the modification and stabilization of soft soil. The soft soils were collected from two different sites and treated with three nanomaterials (nano-copper, nano-alumina, and nano-magnesium). Nanomaterials were added in small amount (≤ 1.0%) by dry weight of the soil. Laboratory tests to determine the compaction characteristics and unconfined compressive strength were performed. Results of the investigation showed significant improvement in maximum dry density, and unconfined compressive strength. The improvement is dependent on the type of nanomaterials. The unconfined compressive strength and maximum dry density increased as the nanomaterials content increased until reach a percentage after which the strength will be decrease. Nanomaterial contents in excess of the optimum content cause agglomeration of particles that adversely affects the mechanical properties of the soils. In general, the addition of finer particles such as nanomaterials, even at low doses, could enhance the geotechnical properties of soil. Also considering the possible negative environmental effects of chemical addition to soils, the possibilities of using nanomaterials as stabilizing agents of soft soils this combined admixture is intended to reduce the cost and promote a more environment-friendly and sustainable stabilizing agent.

Powder metallurgy is emerging day by day as a concrete solution to the new age scientific problem. Every metal has its own characteristics and limitations. Powder metallurgy confluences the good characteristics of different metals into one product, but requires a correct combination of various sub-processes associated with main process. Powder metallurgy conquers the power of 4 P,s i.e. Precision as producing near net shape, Performance as fast and consistent , Productivity as higher output and Price as low considering lesser secondary operation needed. Some important mechanical properties of the different Ti-Nb alloys are analyzed in relation to the human implants. This paper reviews different sub processes of powder metallurgy and their combination for the biomedical application of different power metallurgy products. Papers also describe some advancement in manufacturing techniques and powder metallurgy sub processes that enhance the behavior of materials for human implants.

The interest in energy conservation and management comes from the increased demand on energy in the present day. This issue has become necessary to achieve sustainable development of the society. Energy conservation means the change in the pattern of energy consumption and pursued to reduce the increasing growth in energy consumption. The case of rationalization of energy consumption needs clear mechanisms to address the problem of high consumption rates. Also, the attention should be paid to the transition to a sustainable energy sources that can save energy through natural sources rather than fossil fuels. The energy conservation enlightenment should be promoted among segments of society, whether individuals, families, institutions, and companies to ensure continuity for future generations. The goal of reducing energy consumption can be done in several ways, starting from the design of the building that gets use of the natural energy resources. The employment of thermal insulations at the outer wall is another type of energy conservation. Also, the replacement of bulbs with lamps that consume low power is one of methods of reducing energy consumption. In this paper, the focus was on electrical devices usually used in homes in Oman. Also, the number and types of the used lighting devices were measured, the energy consumed, the number of air conditioners, the number of working hours, and the monthly bill were followed up and recorded. We also conducted a questionnaire to measure the extent of people's knowledge of the importance of energy conservation and ways to preserve it.

Simulation of a construction project area not even travelling there is an innovative idea to have real perception about that area with the innovation of cutting-edge technology of Oculus Rift. Visceral experience inside the imagery is also a new perception of being physically present in a non-physical world by using an Oculus Rift. Virtual simulation on any images and videos provide completely preoccupied environment for the purpose of having real perceptions without being present at that place. Oculus Rift, which is a virtual reality headset, is capable of maintaining six degrees of freedom of rotational and positional tracking to realize the real test of presence in the imagery sphere. Google street view, personal street view and Google Map enable accessing of any location on the earth and virtual reality can create the real perception without moving to the location. Therefore, this study is aimed to work out a cost effective and time efficient model of experiencing virtual site perception of reality without moving to that place. The technique of imagery analysis by using immersive visualization at any locations is implemented in the study. It is an analytical technique for making a comparison among different probable project suitability in a location. In this study, it is also developed a technique of identifying the most suitable location for a particular project by wearing head mounted display integrated with street view, satellite view and bird’s view. In the process, images are introduced by dragging and dropping from the extra features of Unity Engine software into the artificial world representing the reality of Oculus Rift.

Compaction of subbase is often the main load-bearing layer of a pavement. It is designed to evenly spread the load of the paving, it compacted with heavy equipment until the material forms a dense layer of interlocking aggregate. To perform well, subbase aggregates must be strong and durable, and must meet very specific graduation requirements. The main aim of this study is finding the effect of changing energy of compaction on the subbase. the sample of subbase is under class B after testing it by sieve analyses test, the physical properties as (specific gravity, elastic limit, plastic limit &max dry density) have been tested, the sample tested under different energy of compaction (modified proctor test and standard proctor test ) and found the effect of energy on (dry density, void ratio, porosity).

In this paper, we analyze the geotechnical properties of the natural soft soil and its mixture with different nano materials at different percentages by conducting different number of experiments. The main objective of our work is to find whether the nano materials and their percentage level will increase the soft soil geotechnical properties or not. To accomplish this process, initially the natural soil sample is collected and the different geotechnical properties of the collected sample are computed. Then, the nano materials with different percentages are added to the natural soil sample and obtained the corresponding geotechnical properties for the mixture soil sample. Subsequently, a mathematical model is developed to find the optimal geotechnical properties value in different nano materials with different percentages. The developed mathematical model shows the geotechnical properties levels of nano mixture soil for unknown experiments. Finally, a fine tuning model process is conducted to check whether the nano material mixture of the natural soil will increase its geotechnical property or not. In this way, our proposed technique finds the optimal geotechnical property value for the unknown experiments and also produces an accurate result in fine tuning process. The implementation result demonstrates the geotechnical properties results of natural soil and nano mixture soil under different experiments. Our proposed technique shows that the geotechnical property values of the nano mixture soil are high compared to the natural soil. Moreover, the developed mathematical model is better to find the optimal geotechnical property value for unknown experiments.

Abstract: The present study examines the magnetohydrodynamic (MHD) stability characteristics of two superposed, electrically conducting viscous fluids saturating a homogeneous porous medium. The fluids are separated by a horizontal interface and subjected to a uniform magnetic field, while Darcy–Brinkman flow resistance arising from the porous structure modifies the momentum transport. By applying linear perturbation theory in conjunction with the normal-mode technique, a generalized dispersion relation is derived that incorporates the effects of magnetic field strength, viscosity stratification, density contrast, and permeability parameters. The analysis reveals that the presence of a porous matrix exerts a strong stabilizing influence by enhancing momentum dissipation and suppressing the growth rate of interfacial disturbances. The magnetic field further augments this stabilization through magnetic tension, particularly for short-wavelength perturbations. The combined action of magnetic damping and porous resistance raises the critical conditions required for the onset of instability, thereby reducing the likelihood of shear-driven or buoyancy-driven interfacial deformation. The results are relevant to geophysical flows, petroleum reservoir engineering, filtration systems, and industrial processes involving magnetized fluid transport through porous structures.