Epsilon entropy radiator


This facility houses state-of-the-art research equipments: a car-to-car crash test, a proving ground with a road of Belgian brick! All these computations require a high level of accuracy from the software used and a fast turnaround time. The product has to be mature and robust enough to meet industrial expectations. We previously used various other commercial meshing tools, but were not satisfied by the quality of the viscous layers which many times led to divergence. Moreover, the learning curve was cumbersome.


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Help Advanced Search. Integration of single-photon sources and detectors to silicon-based photonics opens the possibility of complex circuits for quantum information processing.

In this work, we demonstrate integration of quantum dots with a silicon photonic add-drop filter for on-chip filtering and routing of telecom single photons. A silicon microdisk resonator acts as a narrow filter that transfers the quantum dot emission and filters the background over a wide wavelength range. Moreover, by tuning the quantum dot emission wavelength over the resonance of the microdisk we can control the transmission of the emitted single photons to the drop and through channels of the add-drop filter.

This result is a step toward the on-chip control of single photons using silicon photonics for applications in quantum information processing, such as linear optical quantum computation and boson sampling. We consider the fundamental protocol of dense coding of classical information assuming that noise affects both the forward and backward communication lines between Alice and Bob. Assuming that this noise is described by the same quantum channel, we define its dense coding capacity by optimizing over all adaptive strategies that Alice can implement, while Bob encodes the information by means of Pauli operators.

Exploiting techniques of channel simulation and protocol stretching, we are able to establish the dense coding capacity of Pauli channels in arbitrary finite dimension, with simple formulas for depolarizing and dephasing qubit channels. We explore the effect of local constraints on one-dimensional bosonic and fermionic ground state phases.

Motivated by recent experiments on Rydberg chains, we constrain the occupation of neighboring sites in known phases of matter. Starting from Kitaev's topological superconductor wire, we find that a soft constraint induces a stable gapless Luttinger liquid phase. We substantiate this intuitive picture using field theoretical and Bethe ansatz methods. In organic microcavities, hybrid light-matter states can form with energies that differ from the bare molecular excitation energies by nearly 1 eV.

A timely question, given recent advances in the development of thermally activated delayed fluorescence materials, is whether strong light-matter coupling can be used to invert the ordering of singlet and triplet states and, in addition, enhance reverse intersystem crossing RISC rates.

Here, we demonstrate a complete inversion of the singlet lower polariton and triplet excited states. We also unambiguously measure the RISC rate in strongly-coupled organic microcavities and find that, regardless of the large energy level shifts, it is unchanged compared to films of the bare molecules. This observation is a consequence of slow RISC to the lower polariton due to the delocalized nature of the state across many molecules and an inability to compete with RISC to the dark exciton reservoir, which occurs at a rate comparable to that in bare molecules.

The detection of photocurrents is central to understanding and harnessing the interaction of light with matter. Although widely used, transport-based detection averages over spatial distributions and can suffer from low photocarrier collection efficiency. Here, we introduce a contact-free method to spatially resolve local photocurrent densities using a proximal quantum magnetometer. We interface monolayer MoS2 with a near-surface ensemble of nitrogen-vacancy centers in diamond and map the generated photothermal current distribution through its magnetic field profile.

By synchronizing the photoexcitation with dynamical decoupling of the sensor spin, we extend the sensor's quantum coherence and achieve sensitivities to alternating current densities as small as 20 nA per micron. Our spatiotemporal measurements reveal that the photocurrent circulates as vortices, manifesting the Nernst effect, and rises with a timescale indicative of the system's thermal properties.

Our method establishes an unprecedented probe for optoelectronic phenomena, ideally suited to the emerging class of two-dimensional materials, and stimulates applications towards large-area photodetectors and stick-on sources of magnetic fields for quantum control.

Via nonlocality distillation, a number of copies of a given nonlocal correlation can be turned into a new correlation displaying a higher degree of nonlocality. Apart from its clear relevance in situations where nonlocality is a resource, distillation protocols also play an important role in the understanding of information-theoretical principles for quantum theory. With that, we generalize previous results in the literature.

For instance, showing a broad class of post-quantum correlations that make communication complexity trivial and violate the information causality principle. Recently, Chau et al. A 95, ] reported a quantum-key-distribution QKD scheme using four-dimensional qudits. Surprisingly, as a function of the bit error rate of the raw key, the secret key rate of this scheme is equal to that of the qubit-based six-state scheme under one-way classical communication using ideal apparatus in the limit of arbitrarily long raw key length.

Here we explain why this is the case in spite of the fact that these two schemes are not linearly related to each other. More importantly, we find that in terms of the four-dimensional dit error rate of the raw key, the Chau et al.

A 82, R ]. In addition, we argue the experimental advantages of the Chau et al. We also compare our experiment with the recent high secret key rate implementation of the Sheridan and Scarani's scheme by Islam et al.

It is commonly accepted that a parametric amplifier can simulate a phase-preserving linear amplifier regardless of how the latter is realized [Caves et al. A 86, ]. If true, this reduces all phase-preserving linear amplifiers to a single familiar model.

Here we disprove this claim by constructing two counterexamples. A detailed discussion of the physics of our counterexamples is provided. It is shown that a Heisenberg-picture analysis facilitates a microscopic explanation of the physics. This also resolves a question about the nature of amplifier-added noise in degenerate two-photon amplification. As laser interferometer gravitational wave GW detectors become quantum noise dominated, understanding the fundamental limit on measurement sensitivity imposed by quantum uncertainty is crucial to guide the search for further noise reduction.

Recent efforts have included applying ideas from quantum information theory to GW detection -- specifically the quantum Cramer Rao bound, which is a minimum bound on error in parameter estimation using a quantum state and is determined by the state's quantum Fisher information QFI with respect to the parameter. Identifying the QFI requires knowing the interaction between the quantum measurement device and the signal, which was rigorously derived for GW interferometer detectors in [Phys.

D 98, ]. In this paper, we calculate the QFI and fundamental quantum limit FQL for GW detection, and furthermore derive explicit reciprocity relations involving the QFI which summarize information exchange between the detector and a surrounding weak quantum GW field.

Specifically, we show that the GW power radiation by the detector's quantum fluctuations are proportional to the QFI, and therefore inversely proportional to its FQL. These relations are fundamental and appear generalizable to a broader class of quantum measurement systems. We develop a suitable technical algorithm to implement a separation of the Minisuperspace configurational variables into quasi-classical and purely quantum degrees of freedom, in the framework of a Polymer quantum Mechanics reformulation of the canonical dynamics.

We then implement the obtained general scheme to the specific case of a Taub Universe, in the presence of a free massless scalar field. In particular, we identify the quasi-classical variables in the Universe volume and a suitable function of the scalar field, while the purely quantum degree of freedom corresponds to the Universe anisotropy.

We demonstrate that the Taub cosmology is associated to a cyclical Universe, oscillating between a minimum and maximum volume turning points, respectively. The pure quantum Universe anisotropy has always a finite value.

Projected Entangled Pair States PEPS are used in practice as an efficient parametrization of the set of ground states of quantum many body systems. The aim of this paper is to present, for a broad mathematical audience, some mathematical questions about PEPS.

Quantum gates unitary gates on physical systems are usually implemented by controlling the Hamiltonian dynamics. When full descriptions of the Hamiltonians parameters is available, the set of implementable quantum gates is easily characterised by quantum control theory. In many real systems, however, the Hamiltonians may include unknown parameters due to the difficulty of precise measurements or instability of the system.

In this paper, we consider the situation that some parameters of the Hamiltonian are unknown, but we still want to perform a robust control of a quantum gate irrespectively to the unknown parameters.

The existence of such control was previously shown in single-qubit systems, and a constructive method was developed for two-qubit systems provided full single-qubit controls are available. We analytically investigate the robust controllability of two-qubit systems, and apply Lie algebraic approaches to handle the cases where only controlling one of the two qubits is allowed.

We also use numerical approaches for these problems since our analytical approaches does not work in some systems. In this manuscript, the behavior of the Wigner function of accelerated and non-accelerated two qubit system passing through different noisy channels is discussed.

The decoherence of the initial quantum correlation due to the noisy channels and the acceleration process is investigated by means of Wigner function. The negative positive behavior of the Wigner function predicts the gain of the quantum classical correlations.

Based on the upper and lower bounds of the Wigner function, the entangled initial state loses its quantum correlation due the acceleration process and the strengths of the noisy channels. However, by controlling the distribution angles, the decoherence of these quantum correlation may be suppressed. For accelerated state, the robustness of the quantum correlations contained in the initial state appears in different ranges of the distribution angles depending on the noisy type.

For the bit phase flip and the phase flip channels, the robustness of the quantum correlations is shown at any acceleration and large range of distribution angles.

However, the fragility of the quantum correlation is depicted for large values for strength of the bit flip channel. Different profiles of the Wigner function are exhibited for the quantum and classical correlations, cup, lune, hemisphere.

By means of a Jordan-Wigner transformation for even and odd sites, we are able to map it into a one-dimensional model of free fermions. We determine the ground-state energies in the positive- and negative-parity subspaces subspaces with an even or odd total number of down spins, respectively and compare them in order to establish the ground-state energy for the entire Hamiltonian.

We derive closed-form expressions for this energy gap between the different parity subspaces and analyze its behavior and dependence on the system size in the various regimes of the applied field. Finally, we suggest an expression for the correlation length of such a model that is consistent with the various values found in the literature for its behavior in the vicinity of critical points.

The absence of information -- entirely or partly -- is called ignorance. Naturally, one might ask if some ignorance of a whole system will imply some ignorance of its parts. Our classical intuition tells us yes, however quantum theory tells us no: it is possible to encode information in a quantum system so that despite some ignorance of the whole, it is impossible to identify the unknown part arXiv We provide this experimental evidence using the transverse spatial modes of light, a powerful resource for testing high dimensional quantum phenomenon.

We propose a scheme for detecting time-varying weak forces using quantum probe consisting of single spin and quantum oscillator under the effect of collective dissipation. We study the force estimation in the steady-state regime where the information of the force is extracted by measuring observable of the oscillator such as quadrature and mean phonon excitation.

We quantify the force sensitivity in terms of quantum Fisher information and show that it diverges approaching the critical spin-boson coupling making the system sensitive to very small force perturbation.

We show that close to the critical coupling the measurement of the oscillator quadrature is optimal in a sense that saturates the fundamental Cramer-Rao bound. In a recent work [A. Aloy et al. We have shown that the inequalities introduced in [J. Tura et al. While the main aim of our previous work was to illustrate the main ideas and applicability of the method, here we outline the details and complement its findings with detailed analysis and further case studies.

This allows us to tackle the case where the system size eventually reaches the thermodynamic limit. We present an experimental signature of the Anderson localisation of microcavity polaritons, and provide a systematic study of the dependence on disorder strength.

We reveal a controllable degree of localisation, as characterised by the inverse-participation ratio, by tuning the positional disorder of arrays of interacting mesas. This constitutes the realisation of disorder-induced localisation in a driven-dissipative system. In addition to being an ideal candidate for investigating localisation in this regime, microcavity polaritons hold promise for low-power, ultra-small devices and their localisation could be used as a resource in quantum memory and quantum information processing.

This challenge, corresponding to resolving spectral structures on energy scales below the mean level spacing, is intimately related to the quest for semiclassically restoring quantum unitarity, which is reflected in real-valued spectral determinants. Guided through insights for quantum graphs we devise a periodic-orbit resummation procedure for quantum chaotic systems invoking periodic-orbit self encounters as the structuring element of a hierarchical phase space dynamics.

This paper presents the definition and implementation of a quantum computer architecture to enable creating a new computational device - a quantum computer as an accelerator.



Genetic Algorithm Based Optimization of Compact Heat Exchangers: A Review

Sixth Lecture. Heat Radiation. Statistical Theory. Following the preparatory considerations of the last lecture we shall treat today the problem which we have come to recognize as one of the most important in the theory of heat radiation: the establishment of that universal function which governs the energy distribution in the normal spectrum. In accordance with what we have seen in connection with the elucidation of the second law through atomistic ideas, the second law is only applicable to a physical system when we consider the quantities which determine the state of the system as mean values of numerous disordered individual values, and the probability of a state is then equal to the number of the numerous, a priori equally probable, complexions which make possible the realization of the state. If the determination of the elementary domains is effected in a manner quite similar to that employed in the kinetic gas theory, there exist, with respect to the relationships there found, very notable differences.

enhancement of entropy is observed in % volume concentration of the Graphene and. Graphene oxide nanofluid when louvered strips are.

Modeling and analysis of solar air channels with attachments of different shapes

Comparable Rabi frequencies are achieved using times less drive power in the flopping mode, as compared with electric dipole spin resonance in a single quantum dot. The flopping-mode driving regime will enable low power control of large-scale spin qubit arrays. The authors show that a dislocation defect can probe the monopole charge characterizing the electronic topology of a multi-Weyl semimetal. To this end, a rather simple mesoscopic setup has been proposed in which this topological invariant leaves a direct imprint on the electrical conductance. Furthermore, the effective pseudo-magnetic flux of the dislocation can be measured in the same setup. These results pave the way for the exploration of the interplay between the lattice and the electronic topology in topological metals. Jacutingaite Pt2HgSe3 is a naturally-occurring layered mineral that, when exfoliated into monolayers, could provide the first physical realization of the Kane-Mele model for a quantum spin Hall insulator. In its bulk form, jacutingaite has been predicted to combine weak and crystalline topological phases. This paper shows that such dual topology emerges from a crucial and surprisingly strong interlayer coupling.


Eight Lectures on Theoretical Physics/VI

epsilon entropy radiator

The Stefan—Boltzmann law describes the power radiated from a black body in terms of its temperature. Since , the value of the constant is. The radiance from a specified angle of view watts per square metre per steradian is given by. The SI unit for absolute temperature T is the kelvin.

How, then, would astronomers on Earth go about finding it?

Pressure drop not correctly predicted

Help Advanced Search. Integration of single-photon sources and detectors to silicon-based photonics opens the possibility of complex circuits for quantum information processing. In this work, we demonstrate integration of quantum dots with a silicon photonic add-drop filter for on-chip filtering and routing of telecom single photons. A silicon microdisk resonator acts as a narrow filter that transfers the quantum dot emission and filters the background over a wide wavelength range. Moreover, by tuning the quantum dot emission wavelength over the resonance of the microdisk we can control the transmission of the emitted single photons to the drop and through channels of the add-drop filter.


Robot or human?

Skip to search form Skip to main content Skip to account menu You are currently offline. Some features of the site may not work correctly. Yadav , S. Giri Published The present study is concentrated on optimization of Compact Heat exchangers. The task of optimization may be considered as a design process, in which any possible candidates will be evaluated based on requirements.

Minimization of total number of entropy generation [epsilon]-NTU method was applied to estimate the heat exchanger pressure drop and effectiveness.

English - Portuguese dictionary

Riccardo Rossi, Laboratorio di Termofluidodinamica Computazionale, Universita' di Bologna, Italy Title: Numerical simulation of scalar mixing from a point source over a wavy wall. Abstract: The release of a passive tracer from a point source over a wavy wall is analyzed using Direct Numerical Simulations DNS to obtain a detailed description of the scalar plume dynamics over a complex topography. Although the scalar source is located on top of one of the wave crests, thus representative of a ground release GS , the comparison with available results for scalar mixing from elevated sources ES shows that the initial decay of mean concentration is affected by the flow separation occurring in the first-half of each wave.


Entropy generation analysis for nanofluid flow inside a duct equipped with porous baffles

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Author: Diane Norton. Recommend Documents. Entropy generation minimization of combined heat and mass transfer devices 1 Entropy generation minimization of combined heat and mass transfer devices The MIT Faculty has made this article openly available. Please share how A 1, Dr. Vikas J.

Never be afraid of failures, if your passion lies in something then always go for it. Thanks for choosing to leave a comment.

Black-body radiation is the thermal electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, emitted by a black body an idealized opaque, non-reflective body. It has a specific spectrum of wavelengths, inversely related to intensity that depend only on the body's temperature, which is assumed for the sake of calculations and theory to be uniform and constant. The thermal radiation spontaneously emitted by many ordinary objects can be approximated as black-body radiation. A perfectly insulated enclosure that is in thermal equilibrium internally contains black-body radiation and will emit it through a hole made in its wall, provided the hole is small enough to have a negligible effect upon the equilibrium. In a dark room, a black body at room temperature appears black because most of the energy it radiates is in the infrared spectrum and cannot be perceived by the human eye.

Call for papers of special issue on Theory, technology and application of information metamaterials. Latest Notice Latest Notice. WeChat Official Account.


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