Current Issue : April - June Volume : 2020 Issue Number : 2 Articles : 5 Articles
This work reports the development of a microcontroller based control system\nto change the speed of a DC motor. Pulse Width Modulation (PWM) technique\nwas used to control the amount of power delivered to the load (the DC\nmotor) without dissipating any wasted power. The components and assembly\nof this microcontroller circuit are highlighted in this paper, and the constructed\ncircuit tested. This device was used to control the speed of a rotating\nfan attached to a DC motor. The DC motor speed variations were read from a\nTachometer connected to this motor and the results obtained show good\nagreement with our expectations. DC Motor speed microcontroller devices\nfind applications in many areas of life, and its applications in small scale industrial\nsettings will no doubt enhance the quest for development in a developing\nnation like ours....
The cooling and heating of spaces are among the largest sources for householdâ??s\nenergy demand. Ground Source Heat Pump (GSHP) is a promising\ntechnology to reduce the energy for cooling and heating purposes. However,\nthe major obstacle hindering the utilization of this technology is the high initial\ncost, especially for the installation of ground coupled heat exchanger. The\nhorizontal closed-loop system offers lower installation cost, as it requires no\nvertical borehole construction. Instead, the heat exchangers can be installed\nin shallow trenches that may be excavated, by small excavator or even by human\nlabor. This paper presents the comparison of two different heat exchangers,\nnamely, the capillary mat and the widely used slinky pipe. Both heat exchangers\nare connected to a heat pump, where continuous heating tests were\ncarried out for 165 hours (APPROX..7 days) for each configuration. The purpose of\nthis research is to show the performance of capillary mat in comparison to\nslinky pipe. Despite during the entire test for capillary mat required 6% higher\nelectricity consumption, compared to slinky heat exchanger, the results still\nsuggest the potential use of capillary mat as alternative to slinky heat exchanger.\nAdditionally, the results also highlight the high hydraulic resistance\nof installed capillary mat heat exchangers may become the major disadvantage\nof the capillary mat....
This paper attempts to reason about the propositions of photons and its movement\nin space according to the known axiom of the definition, and by some\nsimple logical method. The light is by the space motion photon component.\nThe space motion photon has the energy and the quality. Photon in space\nalong straight line direction movement speed identically equal in c. A photon\nmoves in space with uniform helical motion, which is a combination of\nuniform circular motion and uniform linear motion in which the speed of the\nlinear motion and the linear speed of the circular motion are always equal to\nc . Photonâ??s Planck energy .........................
In this paper, we have presented a new approach to the dynamics of hypothetical\nprimary particles, moving at speeds greater than the speed of light in\na vacuum within their flat spacetime, which is why we understood the reason\nwhy they have not been detected so far. By introducing a new factor, we have\nlinked the space-time coordinates of primary particles, within different inertial\nframes of reference. We have shown that transformations of coordinates\nfor primary particles with respect to different inertial frames of reference,\nbased on this factor, constitute the Lorentz transformations. Utilizing this\nfactor, we have set the foundations of primary particle dynamics. The results\nobtained for the dynamic properties of these particles are in accordance with\nthe fundamental laws of physics, and we expect them to be experimentally verifiable.\nLikewise, due to their dynamic properties, we have concluded that\nthe Big Bang could have occurred during a mutual collision of the primary\nparticles, with a sudden speed decrease of some of these particles to a speed\nslightly greater than the speed of light in a vacuum, which would release an\nenormous amount of energy. Created in such manner, our Universe would\npossess a limit on the maximum speed of energy-mass transfer, the speed of\nlight in a vacuum, which we will show after introducing the dynamic properties\nof these particles. Similarly, we have concluded that the creation of other\nuniverses, possessing a different maximum speed of energy-mass transfer,\noccurred during the collision of these particles as well, only by means of deceleration\nof some of these particles to a speed slightly greater than the maximum\nspeed of energy-mass transfer in that particular universe....
In this paper, the dynamic mechanic and optical properties of composites made of\nPolyvinyl Butyral (PVB) and Micro Glass Flakes (MGF) with matching refractive indices (RIs) are\ninvestigated. The composite is produced by a slurry-based process using additional blade casting\nand lamination. It can be shown that a high degree of ordering of the MGF in the polymer matrix\ncan be achieved with this method. This ordering, combined with the platelet-like structure of the\nMGF, leads to very efficient strengthening of the PVB with increasing content of the MGF. By\ncarefully adjusting the RIs of the polymer, it is shown that haze is reduced to below 2%, which has\nnot been achieved with irregular fillers or glass fibers....
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