negative potential
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YMER Digital ◽  
2021 ◽  
Vol 20 (12) ◽  
pp. 412-415
Author(s):  
A Sivakumar ◽  
◽  
P Sathia Morthi ◽  
A Peer Mohamed Essac ◽  
S Mohana Prasath ◽  
...  

The proposed system's basic premise is to reduce personnel during nut fitting and removing wheels from autos. The motor is at the heart of the project and its implementation. Motor, Nut fitting arrangement (multi nut remover), and spur gear arrangement are the components employed here for the efficient operation of separate blocks. The model's main goal is to remove all of a wheel's nuts at once, rather than one by one. The model's premise is to use a spur gear to transfer relative motion to other gears. The primary spur gear is connected to the motor shaft in the model, which rotates due to the motor. The primary gear is the driver, while the secondary gears are the driven. The major gear is located in the model's center. The secondary gears and the primary gear are in sync. To ensure precise meshing and tool spacing, the secondary gears are set at predetermined distances. The drive axle is equipped with primary gear. The cover has several auxiliary axles that extend through it. Each secondary axle has a first end that is positioned inside the housing and a second end that extends outwardly from the cover. One of the first ends is attached to each of several secondary gears. Each of the secondary gears is in contact with the primary gear. One of the secondary axles is connected to each of the couplers. The project and implementation must provide the motor with both positive and negative potential. If we press the corresponding switch for forwarding rotation, the nut will be fixed; if we press the corresponding switch for reverse rotation, the polarity will be reversed, and the nut will be removed. The motor can be controlled according to the needs of the operator. To tighten or remove the nut, the operator should lift the model and place it in the proper location.


2021 ◽  
Vol 943 (1) ◽  
pp. 012011
Author(s):  
Jinhao Wu

Abstract Climate, as the natural environment on which human life depends, is intricately linked to human society. This paper focuses on the characteristics of temperature and its relationship with meteorological elements in China in the last 73 years. The data of this research is from NCEP/NCAR Reanalysis Monthly Means. This study adopts the Empirical Orthogonal Function (EOF) and Singular Value Decomposition (SVD) methods to study the surface temperature characteristics within China, and the synergistic variation between surface temperature and precipitable water content, wind field, and relative humidity in China. The results show that 1980s is a turning point for changes in surface temperature, precipitable water content, wind field, and relative humidity in China. Before 1980s, the temperature in China is low, while after this period, the temperature in China is high and China’s exposure to global warming has increased. Temperature is dominated by negative potential-phase oscillations with relative humidity and wind fields. In the north, temperature and precipitable water content have negative potential-phase oscillations, while temperature and precipitable water content have positive potential-phase oscillations in the south. In the central region of Xinjiang, temperature and precipitable water content have weak negative potential-phase oscillations, while temperature and wind field have positive potential-phase oscillations.


2021 ◽  
Vol 6 (2) ◽  
pp. 272-300
Author(s):  
Scott A Jarvie ◽  
Addyson Frattura

We build this work from the memory of the time we stumbled into tulips at city hall. As guard sirens fled off into the night, we wondered, “Maybe we can borrow some.” We ripped handfuls from the ground and ran. “Don’t worry,” we said, “they are too busy to catch us stealing tulips.” Likewise, we get away with this useless project because others are busy doing useful work: exigent, coherent, important work. We support much of that busyness, and at the same time wonder what is lost with all that attention towards usefulness. What we offer here, through a hybrid of reflective, poetic, essayistic and scholarly forms, may be an attempted escape from the obligations of scholarship. It may be indulgent. It may tell the reader nothing, or only what the reader already knows. Yet it is oriented towards an enduring promise. This is the promise of a literary experience, understood as a kind of resonance, ineffable primarily, but nevertheless one that matters. Such a promise is found in the power and possibility of story, through poetic lines that must be broken and conceptual tethers left incommensurable. We enter this space of breaking and unfurling through an inquiry into use.   The question of use and uselessness is one way of holding human contradictions in both hands. By this we mean that we make and leave space for literary and philosophical inquiries considered useless—in that they do not resolve anything—but nevertheless matterful. We suggest that readers meander these curated pages as they \ meander through an art exhibition or a museum. Within a literary exhibition one can wander through pages, spaces, and ideas. Pause. Dwell. Think. We curate a literary home beyond the demands of making something of use and we invite the reader to sit with us. As with an exhibition, possibility cannot be controlled for and so we exist in potentiality acknowledging both its positive and negative potential. Through our use, misuse, and abuse of literature and philosophy, we make ourselves a home in a possibility that can only be offered, not demanded. We manifest this literary home through fragments of philosophy evoked through a series of microfictions.   As scholars, learners, teachers, and writers we are often asked to defend what our writing does. And it is implicitly suggested that knowledge creation is the result. What is the use of a work that cannot promise new knowledge? Literary knowledge may only be one gorgeous possible ordering. It is a practice which produces a kind of knowledge which is no knowledge, which is useless.  If we must answer what it is that our writing does we suppose that—if anything—it offers up fictions for philosophizing. We explore a home for this work in scholarly contexts which too often find it useless, which is to say we position uselessness as a concept of value for our work as scholars, writers, and teachers. In the end we name no new uses but fiction; we steal tulips.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad A. AL-Shudeifat ◽  
Fatima K. Alhammadi

AbstractAppearance of transverse cracks in rotor systems mainly affects their stiffness content. The stability of such systems at steady-state running is usually analyzed by using the Floquet’s theory. Accordingly, the instability zones of rotational speeds are dominated by negative stiffness content in the whirl response in the vicinity of critical rotational speeds. Consequently, an effective stiffness measure is introduced here to analyze the effect of the crack and the unbalance force vector orientation on the intensity of negative potential and stiffness content in the whirl response. The effective stiffness expression is obtained from the direct integration of the equations of motion of the considered cracked rotor system. The proposed effective stiffness measure is applied for steady-state and transient operations using the Jeffcott rotor model with open and breathing crack models. The intensity of negative potential and stiffness content in the numerical and experimental whirl responses is found to be critically depending on the propagation level of the crack and the unbalance force vector orientation. Therefore, this can be proposed as a crack detection tool in cracked rotor systems that either exhibit recurrent passage through the critical rotational speeds or steady-state running.


2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Heliudson Bernardo ◽  
Robert Brandenberger

Abstract We consider the cosmology obtained using scalar fields with a negative potential energy, such as employed to obtain an Ekpyrotic phase of contraction. Applying the covariant entropy bound to the tower of states dictated by the distance conjecture, we find that the relative slope of the potential |V′|/|V| is bounded from below by a constant of the order one in Planck units. This is consistent with the requirement to obtain slow Ekpyrotic contraction. We also derive a refined condition on the potential which holds near local minima of a negative potential.


2021 ◽  
Author(s):  
Mohammad AL-Shudeifat ◽  
Fatima Alhammadi

Abstract Appearance of fatigue cracks in rotor systems mainly affects their stiffness content. The stability of such systems at steady-state running is usually analyzed by using the Floquet’s theory. Accordingly, the instability zones of rotational speeds are dominated by negative stiffness content in the whirl response in the vicinity of critical rotational speeds. Consequently, an effective stiffness measure is introduced here to analyze the effect of the crack and the unbalance force vector orientation on the intensity of negative potential and stiffness content in the whirl response. The effective stiffness expression is obtained from the direct integration of the equations of motion of the considered cracked rotor system. The proposed effective stiffness measure is applied for steady-state and transient operations using the Jeffcott rotor model with open and breathing crack models. The intensity of negative potential and stiffness content in the numerical and experimental whirl responses is found to be critically depending on the propagation level of the crack and the unbalance force vector orientation. Therefore, this can be proposed as a crack detection tool in cracked rotor systems that either exhibit recurrent passage through the critical rotational speeds or steady-state running.


Author(s):  
Ahmed Ali Ahmed Zaid Mutahar ◽  
Chikhalikar Rajpalsingh S.

The media can be a major obstacle to peace, and a tool to help achieve peace. This paper aims to highlight the role of media in propagating Peace. It discusses different approaches and thoughts which can help in spreading peace to solve the problems and conflicts that currently happen in the world. This paper focuses on the importance of media and its positive and negative potential in relation to conflict. This paper focuses on the significance of the media and its positive capabilities in relation to conflict and violence and limiting their spread in society. It also highlights the role of the media in reducing crimes and defaming perpetrators of crime in full view in all media to reduce the commission of crimes against humanity and their rights. <p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0770/a.php" alt="Hit counter" /></p>


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