46. Al-Ahqaf /The Sand Dunes
I/We begin by the Blessed Name of Allah
The Immensely Merciful to all, The Infinitely Compassionate to everyone.
46:01
a. Ha. Mim.
46:02
a. The sending down of this Book – The Divine Qur’an - is from Allah.
b. The Almighty, The All-Wise.
46:03
a. WE did not create the celestial realm and the terrestrial world and whatever is between them, except for a purpose and for a specified time.
b. Yet those who disbelieve continue turning away from what they are warned about – coming of The Time of Final Judgment.
46:04
a. Say O The Prophet:
b. ‘Consider those who call on other entities apart from Allah.
c. Show me what part of the terrestrial world they have created?
d. Or do they have any partnership in the creation and maintenance of the celestial realm?
e. Bring me any form of a Scripture that came to you before this Qur’an, or any tradition of
Divine knowledge, if you are truthful.’
46:05
a. And who could be more astray/misguided than the one who calls on other entities apart from Allah-
b. those who will not respond to him even until the Time of Resurrection,
c. while they are not even aware of their being called on?
46:06
a. And when people are gathered together for the Final Judgment they – their worshipful entities - will become hostile to those who worshiped them,
b. and they are going to deny all acts of their worship.
46:07
a. But whenever OUR Messages in The Qur’an are recited to them in all their clarity,
b. those who...
Background and Aims: The study identified the risks of increased screen time on generation z considering two parameters i.e., insomnia and obesity and the moderating role of self-control.
Methodology: A cross-sectional study was conducted by convenient sampling technique. The survey only included people who were born between 1997 and 2002. The analysis of the effects of variables took into account only a few parameters. Discriminant validity and convergent validity was used to check reliability and validity while path coefficient analyzed the hypothesis.
Results: Binge-watching has positive significant impact on insomnia and obesity (p<0.05), and the self-control strongly effect the relationship of binge-watching, obesity and insomnia as a moderator (p<0.05).
Conclusion: Binge-watching caused insomnia and obesity while self-control in direct relation to obesity and insomnia controlled the prevalence rate. The moderating role of self-control showed that insufficiency of self-control during binge-watching led to obesity and insomnia. The outcome indicated that Generation Z needs to be encouraged to practice self-control through public health initiatives, social media, seminars, workshops, etc. At the same time, people need to be made aware of how binge-watching affects their health.
Keywords: Insomnia, obesity, self-control, screen time, technology, mortality, exercise.
The aim of the present work is to numerically simulate laminar forced convection in the fully developed flow through the finned annulus of a double-pipe subject to constant heat flux boundary condition (H1) and to investigate the effects of various geometric designs and arrangements of fins on the thermal performance of the finned duct. The designs of the finned annulus considered in the present work are longitudinal triangular fins with equal and unequal heights, and fins with variable fin-tip thickness. The governing partial differential equations of the convection problems are numerically solved by employing the finite element method (FEM) and the discontinuous Galerkin finite element method (DG-FEM). The hydraulic and thermal characteristics like the friction factor, the Nusselt number and the surface flow area goodness factor are studied against various geometric design parameters. Moreover, the validity of various assumptions in simpler models is investigated in more realistic models. The behaviour of the flow and thermal characteristics has been found to match with the physics of the problems and therefore, substantially validates the present simulations. For highly conductive triangular fins of equal heights, the results show upto more than 4 i times gain in the heat transfer rate relative to increase in the pressure loss because of the attachment of fins when the equivalent diameter is used as the characteristic length. Using fins in two groups of different heights, the velocity and temperature distributions can be significantly altered to have more favourable flow and thermal characteristics. For specified values of the number of fins, the thermal conductivity ratio and the size of the inner pipe, a combination of unequal heights of the two fin groups rendering maximum heat transfer coefficient exists in many cases. Such combinations of fin heights are very useful in reducing pressure loss and promoting heat transfer rate. The present study recommends the use of unequal fin heights depending on the cost, weight and heat duty requirements. For longitudinal fins with specified base angle and variable tip thickness, no single tip-angle renders maximum values of the heat transfer coefficient and surface flow area goodness factor for all values of the height and number of fins indicating that the choice of fin-tip angle strongly depends on the number of fins and their height. It is found that highly significant gain in the Nusselt number can be achieved by considering variation in the thickness of fin tip for various values of the conductivity parameter. This gain for trapezoidal fin is upto 38% over the triangular fin and 163% over the rectangular fin. Therefore, the consideration of the fin-tip thickness as a design parameter is significantly important for the optimal design of the present heat exchange system. All the computed results are in excellent comparison with the available literature results.