17,142 research outputs found
Thermodynamic and quantum thermodynamic answers to Einstein's concerns about Brownian movement
On the occasion of the 100th anniversary of the beginning of the
revolutionary contributions to physics by Einstein, I am happy to respond to a
problem posed by him in 1905. He said: In this paper it will be shown that
according to the molecular-kinetic theory of heat, bodies of
microscopically-visible size suspended in a liquid will perform movements of
such magnitude that they can be easily observed in a microscope, on account of
the molecular motions of heat....that is, Brownian molecular motion. In this
article I provide incontrovertible evidence against molecular-kinetic
conception of heat, and a regularization of the Brownian movement that differs
from all the statistical procedures and/or analyses that exist in the archival
literature to date. The regularization is based on either of two distinct but
intimately interrelated revolutionary conceptions of thermodynamics, one is
purely thermodynamic and the other is quantum mechanical.Comment: I added an explicit analytical explanation in the section Quantum
thermodynamic analysis of Brownian movemen
Quantum Uncertainty and Nonlocality: Are they Correctly Understood?
In a brief article [1], Seife refers to works by Einstein and Schroedinger
and concludes that there is a relentless murmur of confusion underneath the
chorus of praise for quantum theory. It is noteworthy that a "murmur" is not
necessarily a cause for replacement of any scientific theory, and that the
issues raised by Einstein, Podolsky, and Rosen, and Schroedinger's responses to
the EPR paper have been satisfactorily resolved by Gyftopoulos and von
Spakovsky [2] in a manner that renders the relentless murmur mute and
unwarranted.Comment: 2 page
Entropy: An inherent, nonstatistical property of any system in any state
Entropy is the distinguishing and most important concept of our efforts to
understand and regularize our observations of a very large class of natural
phenomena, and yet, it is one of the most contentious concepts of physics. In
this article, we review two expositions of thermodynamics, one without
reference to quantum theory, and the other quantum mechanical without
probabilities of statistical mechanics. In the first, we show that entropy is
an inherent property of any system in any state, and that its analytical
expression must conform to eight criteria. In the second, we recognize that
quantum thermodynamics: (i) admits quantum probabilities described either by
wave functions or by nonstatistical density operators; and (ii) requires a
nonlinear equation of motion that is delimited by but more general than the
Schroedinger equation, and that accounts for both reversible and irreversible
evolutions of the state of the system in time. Both the more general quantum
probabilities, and the equation of motion have been defined, and the three laws
of thermodynamics are shown to be theorems of this equation.Comment: 13 page
Quantum Limits in Nanomechanical Systems
In two articles, the authors claim that the Heisenberg uncertainty principle
limits the precision of simultaneous measurements of the position and velocity
of a particle and refer to experimental evidence that supports their claim.
It is true that ever since the inception of quantum mechanics, the
uncertainty relation that corresponds to a pair of observables represented by
non-commuting operators is interpreted by many scientists and engineers,
including Heisenberg himself, as a limitation on the accuracy with which
observables can be measured. However, such a limitation cannot be deduced from
the postulates and theorems of quantum thermodynamics.Comment: 2 page
Thermodynamic and Quantum Thermodynamic Analyses of Brownian Movement
Thermodynamic and quantum thermodynamic analyses of Brownian movement of a
solvent and a colloid passing through neutral thermodynamic equilibrium states
only. It is shown that Brownian motors and E. coli do not represent Brownian
movement
Thermodynamic derivation of reciprocal relations
Reciprocal relations correlate fairly accurately a great variety of
experimental results. Nevertheless, the concepts of statistical fluctuations,
and microscopic reversibility - the bases of the accepted proof of the
relations by Onsager - are illusory and faulty, and contradict the foundations
of the science of thermodynamics. The definitions, postulates, and main
theorems of thermodynamics are briefly presented. It is shown beyond a shadow
of a doubt that thermodynamics is a nonstatistical science that applies to all
systems (both macroscopic, and microscopic, including systems that consist
either of only one structureless particle, or only one spin), to all states
(both thermodynamic or stable equilibrium, and not stable equilibrium), and
that includes entropy as a well defined, intrinsic, nonstatistical property of
any system in any state, at any instant in time. In the light of this novel
conception of thermodynamics, we find that reciprocal relations result from a
well known mathematical theorem, to wit, given a well behaved analytic function
of many variables then the second derivative of the function with respect to
any two variables is independent of the order of differentiation, namely,
whether the first derivative is taken with respect to the one or the other of
the two variables.Comment: The only revision was an addition to the abstract. The paper remains
the sam
On the lack of relation between physics and "Quantum discord and Maxwell's demons"
The information-theoretic arguments presented in a recent publication on
"Quantum discord and Maxwell's demons" are discussed, and found not to address
the problem specified by Maxwell. Two interrelated and definitive exorcisms of
the demon, one purely thermodynamic, and the other quantum-thermodynamic are
briefly discussed. For each of the two exorcisms, the demon is shown to be
incapable to accomplish his assignment neither because of limitations arising
from information-theoretic tools at his disposal, nor because of the value of
his IQ. The limitations are due to the physics of the state of the system on
which he is asked to perform his demonic acts.Comment: 6 page
iVAMS 1.0: Polynomial-Metamodel-Integrated Intelligent Verilog-AMS for Fast, Accurate Mixed-Signal Design Optimization
Electronic circuit behavioral models built with hardware description/modeling
languages such as Verilog-AMS for system-level simulations are typically
functional models. They do not capture the physical design (layout) information
of the target design. Numerous iterations of post-layout design adjustments are
usually required to ensure that design specifications are met with the presence
of layout parasitics. In this paper a paradigm shift of the current trend is
presented that integrates layout-level information in Verilog-AMS through
metamodels such that system-level simulation of a mixed-signal circuit/system
is realistic and as accurate as true parasitic netlist simulation. The
simulations performed with these parasitic-aware models can be used to estimate
system performance without layout iterations. We call this new form of
Verilog-AMS as iVAMS (i.e. Intelligent Verilog-AMS). We call this iVAMS 1.0 as
it is simple polynomial-metamodel integrated Intelligent Verilog-AMS. As a
specific case study, a voltage-controlled oscillator (VCO) Verilog-AMS
behavioral model and design flow are proposed to assist fast PLL design space
exploration. The PLL simulation employing quadratic metamodels achieves
approximately 10X speedup compared to that employing the layout extracted,
parasitic netlist. The simulations using this behavioral model attain high
accuracy. The observed error for the simulated lock time and average power
dissipation are 0.7% and 3%, respectively. This behavioral metamodel approach
bridges the gap between layout-accurate but fast simulation and design space
exploration. The proposed method also allows much shorter design verification
and optimization to meet stringent time-to-market requirements. Compared to the
optimization using the layout netlist, the runtime using the behavioral model
is reduced by 88.9%.Comment: 25 pages, 13 figure
Computations with one and two real algebraic numbers
We present algorithmic and complexity results concerning computations with
one and two real algebraic numbers, as well as real solving of univariate
polynomials and bivariate polynomial systems with integer coefficients using
Sturm-Habicht sequences.
Our main results, in the univariate case, concern the problems of real root
isolation (Th. 19) and simultaneous inequalities (Cor.26) and in the bivariate,
the problems of system real solving (Th.42), sign evaluation (Th. 37) and
simultaneous inequalities (Cor. 43)
What is the second law of thermodynamics and are there any limits to its validity?
In the scientific and engineering literature, the second law of
thermodynamics is expressed in terms of the behavior of entropy in reversible
and irreversible processes. According to the prevailing statistical mechanics
interpretation the entropy is viewed as a nonphysical statistical attribute, a
measure of either disorder in a system, or lack of information about the
system, or erasure of information collected about the system, and a plethora of
analytic expressions are proposed for the various measures. In this paper, we
present two expositions of thermodynamics (both 'revolutionary' in the sense of
Thomas Kuhn with respect to conventional statistical mechanics and traditional
expositions of thermodynamics) that apply to all systems (both macroscopic and
microscopic, including single particle or single spin systems), and to all
states (thermodynamic or stable equilibrium, nonequilibrium, and other states)
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