Thermodynamics and Energy

1803 Submissions

[10] viXra:1803.0651 [pdf] submitted on 2018-03-26 00:54:08

Magnets Control Heat and Sound

Authors: George Rajna
Comments: 34 Pages.

Researchers at The Ohio State University have discovered how to control heat with a magnetic field. [21] Researchers at the University of Illinois at Urbana-Champaign have developed a new technology for switching heat flows 'on' or 'off'. [20] Thermoelectric materials can use thermal differences to generate electricity. Now there is an inexpensive and environmentally friendly way of producing them with the simplest tools: a pencil, photocopy paper, and conductive paint. [19] A team of researchers with the University of California and SRI International has developed a new type of cooling device that is both portable and efficient. [18] Thermal conductivity is one of the most crucial physical properties of matter when it comes to understanding heat transport, hydrodynamic evolution and energy balance in systems ranging from astrophysical objects to fusion plasmas. [17] Researchers from the Theory Department of the MPSD have realized the control of thermal and electrical currents in nanoscale devices by means of quantum local observations. [16] Physicists have proposed a new type of Maxwell's demon—the hypothetical agent that extracts work from a system by decreasing the system's entropy—in which the demon can extract work just by making a measurement, by taking advantage of quantum fluctuations and quantum superposition. [15] Pioneering research offers a fascinating view into the inner workings of the mind of 'Maxwell's Demon', a famous thought experiment in physics. [14] For more than a century and a half of physics, the Second Law of Thermodynamics, which states that entropy always increases, has been as close to inviolable as any law we know. In this universe, chaos reigns supreme. [13] Physicists have shown that the three main types of engines (four-stroke, twostroke, and continuous) are thermodynamically equivalent in a certain quantum regime, but not at the classical level. [12] For the first time, physicists have performed an experiment confirming that thermodynamic processes are irreversible in a quantum system—meaning that, even on the quantum level, you can't put a broken egg back into its shell.
Category: Thermodynamics and Energy

[9] viXra:1803.0305 [pdf] submitted on 2018-03-20 12:33:13

Zeroth Law of Thermodynamics is an Implication and not an Equivalency © Copyright 2018 by Colin James III All Rights Reserved.

Authors: Colin James III
Comments: 1 Page. © Copyright 2018 by Colin James III All rights reserved. info@cec-services dot com

The zeroth law of thermodynamics is confirmed as an implication, but which cannot be coerced into equivalency. Subsequent laws of thermodynamics as based on the zeroth law become implications and not equivalencies. This serves to weaken assertions based on the laws of thermodynamics as equivalencies as reduced to implications.
Category: Thermodynamics and Energy

[8] viXra:1803.0282 [pdf] submitted on 2018-03-19 08:03:17

Flaw in Duncan's Paradox

Authors: Gokaran Shukla
Comments: 6 Pages.

Sheehan \cite{Sheehan1} recently discussed the possibility of existence of dynamically-controlled pressure or temperature gradient in black-body cavity. Duncan \cite{Duncan} proposed that if this pressure gradient exist and can be measured in laboratory then it will violate the $2^{nd}$ law of thermodynamics. Sheehan \cite{Sheehna2} performed black-body cavity experiment by using tungsten and rhenium metals, $H_2$ and $He$ as reactants in gas-surface interface reaction and claim that they have indeed measured the temperature difference (equivalent to the pressure difference according to their definition). In this paper we will discuss about the flaw that exist in Duncan's paradox and in Sheehan \cite{Sheehna2} analysis. We will show that $2^{nd}$ law of thermodynamics is still valid in their experiment.
Category: Thermodynamics and Energy

[7] viXra:1803.0264 [pdf] submitted on 2018-03-17 16:45:33

Hawking Radiation: A Violation of the Zeroth Law of Thermodynamics

Authors: Pierre-Marie Robitaille
Comments: 8 Pages.

This is a copy of the slides I presented on 3/17/2018 at the New England Section Meeting of the American Physical Society in Boston, MA. The link to the abstract is as follows:
Category: Thermodynamics and Energy

[6] viXra:1803.0254 [pdf] submitted on 2018-03-17 07:27:33

Misconceptions Concerning Negative Absolute Temperatures.

Authors: Jeremy Dunning-Davies
Comments: 3 Pages.

The issue of negative absolute temperatures is addressed anew in the light of fairly recent publications in the scientific literature which have totally misrepresented the position of such temperatures on the accepted absolute temperature scale. In particular, claims have been advanced that such temperatures are in fact lower than positive absolute temperatures in violation of the Third Law of Thermodynamics and incidentally in violation of all the work - both theoretical and experimental - of the original investigators of the phenomenon.
Category: Thermodynamics and Energy

[5] viXra:1803.0252 [pdf] submitted on 2018-03-17 07:38:49

Tait, Force and Entropy

Authors: Jeremy Dunning-Davies
Comments: 4 Pages.

Almost 150 years ago, Peter Guthrie Tait gave a lecture to a British Association meeting and took as his subject 'force'. His conclusions were both interesting and controversial but possibly offer a means to understanding better the notion of entropy as it appears in classical thermodynamics. This suggestion, however, applies to entropy - or, more accurately, to entropy difference - as it appears in classical thermodynamics and not to the quantity with the same name which occurs in statistical mechanics and information theory. Finally, there is included a brief examination of the plethora of recent claims to have identified violations of the Second Law of Thermodynamics in nanosized systems. Doubt is cast on the validity of such claims.
Category: Thermodynamics and Energy

[4] viXra:1803.0251 [pdf] submitted on 2018-03-17 07:44:35

Some Thoughts on Basic Thermodynamics

Authors: Jeremy Dunning-Davies
Comments: 2 Pages.

Here attention returns to the fundamental starting point for classical thermodynamics - the notion of a heat engine working in a cycle. What follows is based exclusively on the lucid writings of Peter Guthrie Tait and much of the argument closely follows his original. However, this is used to illustrate how modern physics has tended to stray away from the basics of this crucially important topic of thermodynamics. Attention is drawn to the difference between such classical thermodynamics and statistical thermodynamics.
Category: Thermodynamics and Energy

[3] viXra:1803.0118 [pdf] submitted on 2018-03-08 13:50:28

Heat Switch for Electronics

Authors: George Rajna
Comments: 31 Pages.

Researchers at the University of Illinois at Urbana-Champaign have developed a new technology for switching heat flows 'on' or 'off'. [20] Thermoelectric materials can use thermal differences to generate electricity. Now there is an inexpensive and environmentally friendly way of producing them with the simplest tools: a pencil, photocopy paper, and conductive paint. [19] A team of researchers with the University of California and SRI International has developed a new type of cooling device that is both portable and efficient. [18]
Category: Thermodynamics and Energy

[2] viXra:1803.0065 [pdf] submitted on 2018-03-05 10:03:11

Research on the Method About Designing of Solar-Wind Complex Generation Street Light System and the Enhancement of the Reliability of Its Power System by Realizing MPPT Maneuver Using Dspic30f4013

Authors: Kang Kyong-Mo, Ri Un-Chol, Kim Yun-Chol, Kim Shong-Jae, Ri kyong-Ju, Cho Zhongo-Huan
Comments: 6 Pages.

This article describes the design principles, design conditions, and design methods of combined wind power and solar power generation system, and discusses a new method for improving the Increasing trust of solar-wind complex generation street lighting system by DSPIC30F4013. In addition, by using the characteristics of this piece with four PWM control outlets, it is possible to smoothly perform the MPPT control of several DC-DC converters, to give a new steering algorithm, and to control the DC-DC converter To improve the stability and the life of the battery, thereby raising the trust level of thesolar-wind complex generation street lighting system.
Category: Thermodynamics and Energy

[1] viXra:1803.0008 [pdf] submitted on 2018-03-01 21:29:03

A Study on the Optimum Control of stair Step Hydropower Plant by the Considering Operation Characteristics of Turbine

Authors: Kim Chol-Gyong, Sin Gyong-Il, Ri Un-Chol, Pak Il-Un, Chon Gi-Sam, Ri Guang-il, Kim Chol-Ho, Kim Su-Song
Comments: 6 Pages.

Long - term optimal control of hydroelectric power plants plays an important role in improving the utilization efficiency of the water resource, but it is not elaborate to calculate the calculation results of the optimization model by using the established output power. Speaking of this problem, in general, the hydraulic turbine efficiency in the total efficiency of hydroelectric power plants depends on the power generation head and power. Changes in the generation head during the mid-long-term operation of hydroelectric power plants lead to changes in the efficiency of the turbines. The relationship between power generation head - output and efficiency is show in the overall operating characteristic curve of the turbines. However, considering the calculation methods so far, it is consider that the average output power is use in the mid - to long - term optimal control of the stepped hydroelectric power plant and the calculation is not detailed and the operation characteristics of the turbines are not considered. In this case, the total operating characteristic curve of the turbine is use to obtain the change of the turbine efficiency according to the change of the generation water head of the long-term optimum control process of the hydroelectric power plant, and the output of the power plant is obtained based in theory. As shown in the long series calculation of the stair Step hydroelectric power station of Chong-chon River, the relative error of the between this method and multi - year average generation amount of stationary side method is 2.7%, which is more suitable for production practice. Therefore, this method has a relatively good reference effect on the development of mid - and long - term subdivision management of stepped hydroelectric power plants.
Category: Thermodynamics and Energy