cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Land Classification in Satellite Images by Injecting Traditional Features to CNN Models
Creators: name: Aksoy, Mehmet Cagri
name: Sirmacek, Beril
name: Unsalan, Cem
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: J.0
subject: 68Txx

description: Deep learning methods have been successfully applied to remote sensing problems for several years. Among these methods, CNN based models have high accuracy in solving the land classification problem using satellite or aerial images. Although these models have high accuracy, this generally comes with large memory size requirements. On the other hand, it is desirable to have small-sized models for applications, such as the ones implemented on unmanned aerial vehicles, with low memory space. Unfortunately, small-sized CNN models do not provide high accuracy as with their large-sized versions. In this study, we propose a novel method to improve the accuracy of CNN models, especially the ones with small size, by injecting traditional features to them. To test the effectiveness of the proposed method, we applied it to the CNN models SqueezeNet, MobileNetV2, ShuffleNetV2, VGG16, and ResNet50V2 having size 0.5 MB to 528 MB. We used the sample mean, gray level co-occurrence matrix features, Hu moments, local binary patterns, histogram of oriented gradients, and color invariants as traditional features for injection. We tested the proposed method on the EuroSAT dataset to perform land classification. Our experimental results show that the proposed method significantly improves the land classification accuracy especially when applied to small-sized CNN models.
Multidimensional Spectroscopy of Time-Dependent Impurities in Ultracold Fermions
Creators: name: Wang, Jia
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We investigate the system of a heavy impurity immersed in a degenerated Fermi gas, where the impurity's internal degree of freedom (pseudospin) is manipulated by a series of radiofrequency (RF) pulses at several different times. Applying the functional determinant approach, we carry out an essentially exact calculation of the Ramsey-interference-type responses to the RF pulses. These responses are universal functions of the multiple time intervals between the pulses for all time and can be regarded as multidimensional (MD) spectroscopy of the system in the time domain. A Fourier transformation of the time intervals gives the MD spectroscopy in the frequency domain, providing insightful information on the many-body correlation and relaxation via the cross-peaks, e.g., the off-diagonal peaks in a two-dimensional spectrum. These features are inaccessible for the conventional, one-dimensional absorption spectrum. Our scheme provides a new method to investigate many-body nonequilibrium physics beyond the linear response regime with the accessible tools in cold atoms.
Calculation- and Visualization-Tool (CVT) for Partial Shading of Photovoltaic Systems
Creators: name: Kuonen, F.
name: Gfeller, D.
name: Schott, T.
name: Schuepbach, E.
name: Heck, H.
name: Muntwyler, U.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Operation of PV Systems

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1945-1947
description: Partial shading of photovoltaic systems can lead to disproportionate power losses. To visualize and
precisely calculate the characteristics of a partial shaded PV system, a new simulation tool has been developed.
Compared to existing simulation tools that address a PV module as a whole, our new Calculation- and Visualisation
Tool (CVT) for partial shading of photovoltaic systems is able to provide quantifications of power losses at individual
photovoltaic cell level. Using the CVT, comparisons of calculations and measurements of the whole PV generator are
possible. This is especially an advantage to analyse partially shaded situations of a PV generator.
Coarse and uniform embeddings
Creators: name: Braga, Bruno de Mendonça
Publisher: name: arXiv
Year: 2015
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46B80

description: In these notes, we study the relation between uniform and coarse embeddings between Banach spaces. In order to understand this relation better, we also look at the problem of when a coarse embedding can be assumed to be topological. Among other results, we show that if a Banach space $X$ uniformly embeds into a minimal Banach space $Y$, then $X$ simultaneously coarsely and uniformly embeds into $Y$, and if a Banach space $X$ coarsely embeds into a minimal Banach space $Y$, then $X$ simultaneously coarsely and homeomorphically embeds into $Y$ by a map with uniformly continuous inverse.
description: in Journal of Functional Analysis (2017)
Comparison of Various Models for the Estimation of the Performance Loss Rate of Seven PV Technologies over Five Years in Alpine Climate
Creators: name: Ingenhoven, P.
name: Belluardo, G.
name: Moser, D.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Operation of PV Systems

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1956-1959
description: The interest in methodologies for the estimation of the performance loss rate (PLR) using data from PV systems
arises with the aging of an increasing amount of PV installations at different climates. These methodologies must be simple,
i.e. involve few quantities as input. Furthermore, the associated uncertainty must be kept low in order to be a reliable tool
for the verification of module manufacturers’ warranties.
This study compares the PLR of seven PV systems based on different technologies using four different methodologies that
are presented and discussed. Results are compared on the basis of the PLR and the respective regression uncertainty. We
find that, especially for technologies with a strong seasonal response, the error of the estimated PLR can be significantly
reduced using seasonal decomposition methods such as a simple moving average. Other more physical approaches like the
PVUSA method to reduce seasonality reduce the error as well, however remaining oscillations that are not captured by the
physical description enlarge the error.
Yield Losses of PID-Affected PV Systems - Simulation of Yield Losses Beyond Power Loss
Creators: name: Arp, J.
name: Jaeckel, B.
name: Behrschmidt, J.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
PV Cells and Modules

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1905-1907
description: Target of this work is to estimate the extent of yield losses of potential induced degradation (PID) affected PV
systems and to compare these with the STC power losses. It is obvious that a PV system which faces a loss of STC
power will face at least a yield loss, which often assumed to be in the same range like STC power loss. In fact, the
yield loss will be much higher for PID since it has a significantly stronger impact on the performance at low
irradiance. This effect becomes relevant already in the initial phase of PID when the STC power is hardly affected.
We simulate three PV systems with two different sets of irradiation data for a Mediterranean area (Greece) and a
moderate climate (Germany). For the simulation we used PVSyst with a fixed tilted, open rack mounting structure
without any shading and weather data from Meteonorm. The PVSyst simulations are resulting in different specific
energy production as a function of location and performance of the string. This is further folded with the STC power
loss to calculate the total relative energy yield loss of a system which is also a loss in revenue.
Statistical Hypothesis Testing Based on Machine Learning: Large Deviations Analysis
Creators: name: Braca, Paolo
name: Millefiori, Leonardo M.
name: Aubry, Augusto
name: Marano, Stefano
name: De Maio, Antonio
name: Willett, Peter
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (stat.ML)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: Probability (math.PR)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: We study the performance -- and specifically the rate at which the error probability converges to zero -- of Machine Learning (ML) classification techniques. Leveraging the theory of large deviations, we provide the mathematical conditions for a ML classifier to exhibit error probabilities that vanish exponentially, say $\sim \exp\left(-n\,I + o(n) \right)$, where $n$ is the number of informative observations available for testing (or another relevant parameter, such as the size of the target in an image) and $I$ is the error rate. Such conditions depend on the Fenchel-Legendre transform of the cumulant-generating function of the Data-Driven Decision Function (D3F, i.e., what is thresholded before the final binary decision is made) learned in the training phase. As such, the D3F and, consequently, the related error rate $I$, depend on the given training set, which is assumed of finite size. Interestingly, these conditions can be verified and tested numerically exploiting the available dataset, or a synthetic dataset, generated according to the available information on the underlying statistical model. In other words, the classification error probability convergence to zero and its rate can be computed on a portion of the dataset available for training. Coherently with the large deviations theory, we can also establish the convergence, for $n$ large enough, of the normalized D3F statistic to a Gaussian distribution. This property is exploited to set a desired asymptotic false alarm probability, which empirically turns out to be accurate even for quite realistic values of $n$. Furthermore, approximate error probability curves $\sim ζ_n \exp\left(-n\,I \right)$ are provided, thanks to the refined asymptotic derivation (often referred to as exact asymptotics), where $ζ_n$ represents the most representative sub-exponential terms of the error probabilities.
Recoverty Method for Solar Modules Affected by Potential Induced Degradation in Utility-Scale Solar Plants
Creators: name: Hu, Y.
name: Ni, P.
name: Wei, Q.
name: Li, C.
name: Mou, Z.
name: Hu, L.
name: Yan, Y.
name: Liu, C.
name: Lu, J.
name: Wu, C.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
PV Cells and Modules

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1912-1914
description: Potential induced degradation(PID) of PV solar modules has been observed and in the discussion
for years because of the significant power loss it has contributed to. The main reason leads this is that current
modules qualification testing and standards have short in ability to evaluate modules’ long term durability under a
large system bias in the fields. PV systems and the ambient working environment interact to cause PID, which is
also attributed to factors on cells, modules and systems. In this paper, we focus on researching and verifying the
application effects of PV Offset Box developed by SMA on recovering PID in the utility-scale PV plants in the
region with high temperature and humility. One plant is located in Kumamoto, Japan and another one is built
above the fishpond in the east of China. Modules from both plants have been found to be affected by PID.
Geometric properties of solutions to the total variation denoising problem
Creators: name: Chambolle, Antonin
name: Duval, Vincent
name: Peyré, Gabriel
name: Poon, Clarice
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This article studies the denoising performance of total variation (TV) image regularization. More precisely, we study geometrical properties of the solution to the so-called Rudin-Osher-Fatemi total variation denoising method. The first contribution of this paper is a precise mathematical definition of the "extended support" (associated to the noise-free image) of TV denoising. It is intuitively the region which is unstable and will suffer from the staircasing effect. We highlight in several practical cases, such as the indicator of convex sets, that this region can be determined explicitly. Our second and main contribution is a proof that the TV denoising method indeed restores an image which is exactly constant outside a small tube surrounding the extended support. The radius of this tube shrinks toward zero as the noise level vanishes, and are able to determine, in some cases, an upper bound on the convergence rate. For indicators of so-called "calibrable" sets (such as disks or properly eroded squares), this extended support matches the edges, so that discontinuities produced by TV denoising cluster tightly around the edges. In contrast, for indicators of more general shapes or for complicated images, this extended support can be larger. Beside these main results, our paper also proves several intermediate results about fine properties of TV regularization, in particular for indicators of calibrable and convex sets, which are of independent interest.
Multipartite Gaussian steering: monogamy constraints and quantum cryptography applications
Creators: name: Xiang, Yu
name: Kogias, Ioannis
name: Adesso, Gerardo
name: He, Qiongyi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We derive laws for the distribution of quantum steering among different parties in multipartite Gaussian states under Gaussian measurements. We prove that a monogamy relation akin to the generalized Coffman-Kundu-Wootters inequality holds quantitatively for a recently introduced measure of Gaussian steering. We then define the residual Gaussian steering, stemming from the monogamy inequality, as an indicator of collective steering-type correlations. For pure three-mode Gaussian states, the residual acts a quantifier of genuine multipartite steering, and is interpreted operationally in terms of the guaranteed key rate in the task of secure quantum secret sharing. Optimal resource states for the latter protocol are identified, and their possible experimental implementation discussed. Our results pin down the role of multipartite steering for quantum communication.
description: 6 pages, 2 figures. Close to published version
Refined Lower Bounds for Adversarial Bandits
Creators: name: Gerchinovitz, Sébastien
name: Lattimore, Tor
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistics Theory (math.ST)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We provide new lower bounds on the regret that must be suffered by adversarial bandit algorithms. The new results show that recent upper bounds that either (a) hold with high-probability or (b) depend on the total lossof the best arm or (c) depend on the quadratic variation of the losses, are close to tight. Besides this we prove two impossibility results. First, the existence of a single arm that is optimal in every round cannot improve the regret in the worst case. Second, the regret cannot scale with the effective range of the losses. In contrast, both results are possible in the full-information setting.
Predictors for high frequency processes based on rational polynomials approximation of periodic exponentials
Creators: name: Dokuchaev, Nikolai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: Information Theory (cs.IT)
subject: Optimization and Control (math.OC)
subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The paper presents linear integral predictors for continuous time high-frequency signals with a a finite spectrum gap. The predictors are based on approximation of a complex valued periodic exponential (complex sinusoid) by rational polynomials.
Asymptotic Plateau Problem in H2xR
Creators: name: Coskunuzer, Baris
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 53A10, 53C42

description: We give a fairly complete solution to the asymptotic Plateau Problem for area minimizing surfaces in H2xR. In particular, we identify the collection of Jordan curves in the asymptotic boundary of H2xR, which bounds an area minimizing surface in H2xR. Furthermore, we study the similar problem for minimal surfaces, and show that the situation is highly different.
description: 32 pages, 7 figures. Details added at referee's request
Lifetime Warranty Test Method Considering Potential Induced Degradation Recovery Behavior
Creators: name: Kang, K.
name: Kim, B.
name: Park, S.
name: Chang, S.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
PV Cells and Modules

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1884-1887
description: In recent years several failure modes of PV modules operated under high potentials were observed.
Most dominant degradation mechanism is called "potential induced degradation (PID)" of crystalline PV modules [1].
PID test as proposed by the IEC working group does not reflect on particular modules. As a consequence, they do not
fulfill the requirements of a lifetime warranty test [2]. Especially, it is not reflect the recovery characteristics of the
solar cell. In this study we have focused on the lifetime test method considering the recovery characteristics of the ntype
mono crystalline solar cell. The sensitivity of the modules regarding potential induced power degradation was
investigated with respect to the recovery behavior under illumination. Positive as well as negative potential to ground
was considered. The test was divided in two parts. First, a PID test was performed according to IEC TS 62804 ed. 1,
method a. Then, a special PID-/ light-recovery sequence was performed.
Temporal self-compression and self-frequency shift of sub-microjoule pulses at 8 MHz repetition rate
Creators: name: Tani, Francesco
name: Lampen, Jacob
name: Butryn, Martin
name: Frosz, Michael H.
name: Jiang, Jie
name: Fermann, Martin
name: Russell, Philip St. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We combine soliton dynamics in gas-filled hollow-core photonic crystal fibers with a state-of-the-art fiber laser to realize a turn-key system producing few-fs pulses at 8 MHz repetition rate at pump energies as low as 220 nJ. Furthermore, by exploiting the soliton self-frequency shift in a second hydrogen-filled hollow-core fiber, we efficiently generate pulses as short as 22 fs, continuously tunable from 1100 nm to 1474 nm.
Inference of Regulatory Networks Through Temporally Sparse Data
Creators: name: Alali, Mohammad
name: Imani, Mahdi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Machine Learning (cs.LG)
subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences
subject: 62M05

description: A major goal in genomics is to properly capture the complex dynamical behaviors of gene regulatory networks (GRNs). This includes inferring the complex interactions between genes, which can be used for a wide range of genomics analyses, including diagnosis or prognosis of diseases and finding effective treatments for chronic diseases such as cancer. Boolean networks have emerged as a successful class of models for capturing the behavior of GRNs. In most practical settings, inference of GRNs should be achieved through limited and temporally sparse genomics data. A large number of genes in GRNs leads to a large possible topology candidate space, which often cannot be exhaustively searched due to the limitation in computational resources. This paper develops a scalable and efficient topology inference for GRNs using Bayesian optimization and kernel-based methods. Rather than an exhaustive search over possible topologies, the proposed method constructs a Gaussian Process (GP) with a topology-inspired kernel function to account for correlation in the likelihood function. Then, using the posterior distribution of the GP model, the Bayesian optimization efficiently searches for the topology with the highest likelihood value by optimally balancing between exploration and exploitation. The performance of the proposed method is demonstrated through comprehensive numerical experiments using a well-known mammalian cell-cycle network.
description: 9 Pages, 6 Figures
Quantum walled Brauer algebra: commuting families, Baxterization, and representations
Creators: name: Semikhatov, A M
name: Tipunin, I Yu
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: For the quantum walled Brauer algebra, we construct its Specht modules and (for generic parameters of the algebra) seminormal modules. The latter construction yields the spectrum of a commuting family of Jucys--Murphy elements. We also propose a Baxterization prescription; it involves representing the quantum walled Brauer algebra in terms of morphisms in a braided monoidal category and introducing parameters into these morphisms, which allows constructing a "universal transfer matrix" that generates commuting elements of the algebra.
description: V3: 54pp., minor changes and corrections (mainly suggested by the referee); references updated
Development of a Matlab Based Sizing and Simulation Tool for Solar Photovoltaic Pumping System (PVPS)
Creators: name: Hasan, R.
name: Zehner, M.
name: Mayer, O.
name: Gottschalg, R.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Operation of PV Systems

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1920-1923
description: The use of renewable energy like solar PV standalone systems to produce electricity for water pumping, represents
a good solution both economic and technical especially in rural/off-grid area. But both the natural resources water and solar are nonstatic
and volatile. This makes the PVPS design most challenging because there is no fixed operational or duty point for motor-pump set
like the conventional electric systems. Hence the focus of this research is to develop a sizing tool which can simply estimate the optimized
PV generator size of a solar PV pumping system (PVPS). The developed sizing tool is named as ‘DASTPVPS-Reloaded’ and the
notable features of this tool are high user friendliness, minimum need of inputs, simple data base formate and interactive graphical
representaiton of outputs. It can also provide different simulation outputs and give a technical guidelines to select suitable components
and system layouts for PVPS.
Unconditional security of entanglement-based continuous-variable quantum secret sharing
Creators: name: Kogias, Ioannis
name: Xiang, Yu
name: He, Qiongyi
name: Adesso, Gerardo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The need for secrecy and security is essential in communication. Secret sharing is a conventional protocol to distribute a secret message to a group of parties, who cannot access it individually but need to cooperate in order to decode it. While several variants of this protocol have been investigated, including realizations using quantum systems, the security of quantum secret sharing schemes still remains unproven almost two decades after their original conception. Here we establish an unconditional security proof for continuous variable entanglement-based quantum secret sharing schemes, in the limit of asymptotic keys and for an arbitrary number of players. We tackle the problem by resorting to the recently developed one-sided device-independent approach to quantum key distribution. We demonstrate theoretically the feasibility of our scheme, which can be implemented by Gaussian states and homodyne measurements, with no need for ideal single-photon sources or quantum memories. Our results contribute to validating quantum secret sharing as a viable primitive for quantum technologies.
description: 6 pages, 1 figure. Close to published version
Limits on the cosmic neutrino background
Creators: name: Bauer, Martin
name: Shergold, Jack D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present the first comprehensive discussion of constraints on the cosmic neutrino background (C$ν$B) overdensity, including theoretical, experimental and cosmological limits for a wide range of neutrino masses and temperatures. Additionally, we calculate the sensitivities of future direct and indirect relic neutrino detection experiments and compare the results with the existing constraints, extending several previous analyses by taking into account that the C$ν$B reference frame may not be aligned with that of the Earth. The Pauli exclusion principle strongly disfavours overdensities $η_ν\gg 1$ at small neutrino masses, but allows for overdensities $η_ν\lesssim 125$ at the KATRIN mass bound $m_ν \simeq 0.8\,\mathrm{eV}$. On the other hand, cosmology strongly favours $0.2 \lesssim η_ν \lesssim 3.5$ in all scenarios. We find that direct detection proposals are capable of observing the C$ν$B without a significant overdensity for neutrino masses $m_ν \gtrsim 50\,\mathrm{meV}$, but require an overdensity $η_ν \gtrsim 3\times 10^5$ outside of this range. We also demonstrate that relic neutrino detection proposals are sensitive to the helicity composition of the C$ν$B, whilst some may be able to distinguish between Dirac and Majorana neutrinos.
description: 71 pages, 15 figures. Aligned with version published in JCAP
Simple and Accurate Monitoring of Expected PV Power Generation by Using Mini-PV Module
Creators: name: Saito, K.
name: Yamazaki, J.
name: Yoshino, D.
name: Higuchi, N.
name: Kondo, M.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Operation of PV Systems

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1927-1930
description: The evaluation method of the expected photovoltaic (PV) power and energy generation by using the PV
mini-module is proposed as a simple, cost-effective, and accurate monitoring and is examined by the comparison with the
actual power and energy generation of the PV power system in the field. By monitoring of the deviation ratio between the
daily amount of actual energy generation in DC (DEAG-DC) and of the expected energy generation estimated from the
mini-module output power (DEEG-MM) on the days picked out above the appropriate threshold of its DEAG-DC, the
potential of this method for highly accurate estimation is demonstrated, where it can detect the decrease of the PV power
system as small as 1% in terms of the number of faulty panels with the average of the deviation ratio owing to its quite
small offset less than 1% and with its small standard deviation less than a few %.
Improving the Performance of Robust Control through Event-Triggered Learning
Creators: name: von Rohr, Alexander
name: Solowjow, Friedrich
name: Trimpe, Sebastian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Robust controllers ensure stability in feedback loops designed under uncertainty but at the cost of performance. Model uncertainty in time-invariant systems can be reduced by recently proposed learning-based methods, which improve the performance of robust controllers using data. However, in practice, many systems also exhibit uncertainty in the form of changes over time, e.g., due to weight shifts or wear and tear, leading to decreased performance or instability of the learning-based controller. We propose an event-triggered learning algorithm that decides when to learn in the face of uncertainty in the LQR problem with rare or slow changes. Our key idea is to switch between robust and learned controllers. For learning, we first approximate the optimal length of the learning phase via Monte-Carlo estimations using a probabilistic model. We then design a statistical test for uncertain systems based on the moment-generating function of the LQR cost. The test detects changes in the system under control and triggers re-learning when control performance deteriorates due to system changes. We demonstrate improved performance over a robust controller baseline in a numerical example.
description: To appear in the proceedings of the 61st IEEE Conference on Decision and Control
Analysis of Photovoltaic Module after Potential Induced Degeneration
Creators: name: Vanek, J.
name: Hylsky, J.
name: Strachala, D.
name: Sturm, M.
name: Cudek, P.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
PV Cells and Modules

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1901-1904
description: This work deals with the phenomenon called Potential-Induced Degradation of PV modules (PID
shortly). Currently is this problem solved in a lot of scientific institutes where is analyzed the physical description of
the process that occurs due to PID. The cause of PID degradation is in a migration of positive sodium ions from glass
(that protects PV modules from the environmental influences) to the PV cell which leads to a negative effect in a pn
junction of photovoltaic cell. This article is focused on the entire photovoltaic module. PV module is firstly degraded
and then regenerated through an applied voltage of 600 V between the aluminum frame and PV cells of module. The
degradation and regeneration process was locally supported by increasing of the temperature of PV module to 80 ° C.
In this way was possible to observe the influence of temperature in a PID affected PV module.
Low-energy plasmon excitations in infinite-layer nickelates
Creators: name: Zinni, Luciano
name: Bejas, Matías
name: Yamase, Hiroyuki
name: Greco, Andrés
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The discovery of superconductivity in infinite-layer nickelates is presently an important topic in condensed-matter physics, and potential similarities to and differences from cuprates are under intense debate. We determine general features of the charge excitation spectrum in nickelates from two opposite viewpoints: (i) Nickelates are regarded as strongly correlated electron systems like cuprate superconductors and thus can be described by the $t$-$J$ model, and (ii) electron correlation effects are not as strong as in cuprates, and thus, random-phase approximation (RPA) calculations may capture the essential physics. We find that in both cases, plasmon excitations are realized around the momentum transfer $\vq=(0,0,q_z)$, although they tend to be damped more strongly in the RPA. In particular, this damping is enhanced by the relatively large interlayer hopping expected in nickelates. Besides reproducing the optical plasmon at $\vq=(0,0,0)$ observed in Nd$_{0.8}$Sr$_{0.2}$NiO$_2$, we obtain low-energy plasmons with gaps of $\sim 360$ and $\sim 560$ meV at $\vq=(0,0,q_z)$ for finite $q_z$ in cases (i) and (ii), respectively. The present work offers a possible theoretical hint to answer whether nickelates are cupratelike or not and contributes to the general understanding of the charge dynamics in nickelates.
description: 21 pages, 5 figures
Search for top squark pair production in compressed-mass-spectrum scenarios in proton-proton collisions at sqrt(s) = 8 TeV using the alpha[T] variable
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: An inclusive search is performed for supersymmetry in final states containing jets and an apparent imbalance in transverse momentum, pt[miss], due to the production of unobserved weakly interacting particles in pp collisions at a centre-of-mass energy of 8 TeV. The data, recorded with the CMS detector at the CERN LHC, correspond to an integrated luminosity of 18.5 inverse femtobarns. The dimensionless kinematic variable alpha[T] is used to discriminate between events with genuine pt[miss] associated with unobserved particles and spurious values of pt[miss] arising from jet energy mismeasurements. No excess of event yields above the expected standard model backgrounds is observed. The results are interpreted in terms of constraints on the parameter space of several simplified models of supersymmetry that assume the pair production of top squarks. The search provides sensitivity to a broad range of top squark decay modes, including the two-body decay top squark to c chi0, where c is a charm quark and chi0 is the lightest neutralino, as well as the four-body decay top squark to b f f' chi0, where b is a bottom quark and f and f' are fermions produced in the decay of an intermediate off-shell W boson. These modes dominate in scenarios in which the top squark and lightest neutralino are nearly degenerate in mass. For these modes, top squarks with masses as large as 260 and 230 GeV are excluded, respectively, for the two- and four-body decays.
description: Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SUS-14-006/index.html
Parameterizing edge modification problems above lower bounds
Creators: name: van Bevern, René
name: Froese, Vincent
name: Komusiewicz, Christian
Publisher: name: arXiv
Year: 2015
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: G.2.2; F.2.2; G.2.1
subject: 05C85

description: We study the parameterized complexity of a variant of the $F$-free Editing problem: Given a graph $G$ and a natural number $k$, is it possible to modify at most $k$ edges in $G$ so that the resulting graph contains no induced subgraph isomorphic to $F$? In our variant, the input additionally contains a vertex-disjoint packing $\mathcal{H}$ of induced subgraphs of $G$, which provides a lower bound $h(\mathcal{H})$ on the number of edge modifications required to transform $G$ into an $F$-free graph. While earlier works used the number $k$ as parameter or structural parameters of the input graph $G$, we consider instead the parameter $\ell:=k-h(\mathcal{H})$, that is, the number of edge modifications above the lower bound $h(\mathcal{H})$. We develop a framework of generic data reduction rules to show fixed-parameter tractability with respect to $\ell$ for $K_3$-Free Editing, Feedback Arc Set in Tournaments, and Cluster Editing when the packing $\mathcal{H}$ contains subgraphs with bounded solution size. For $K_3$-Free Editing, we also prove NP-hardness in case of edge-disjoint packings of $K_3$s and $\ell=0$, while for $K_q$-Free Editing and $q\ge 6$, NP-hardness for $\ell=0$ even holds for vertex-disjoint packings of $K_q$s. In addition, we provide NP-hardness results for $F$-free Vertex Deletion, were the aim is to delete a minimum number of vertices to make the input graph $F$-free.
description: Version accepted to Theory of Computing Systems, CSR'16 special issue
Electron-energy-loss and time-dependent density functional theory study on the plasmon dispersion in 2H-NbS2
Creators: name: Cudazzo, Pierluigi
name: Müller, Eric
name: Habenicht, Carsten
name: Gatti, Matteo
name: Berger, Helmuth
name: Knupfer, Martin
name: Rubio, Angel
name: Huotari, Simo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We examine the experimental and theoretical electron-energy loss spectra in 2$H$-Cu$_{0.2}$NbS$_2$ and find that the 1 eV plasmon in this material does not exhibit the regular positive quadratic plasmon dispersion that would be expected for a normal broad-parabolic-band system. Instead we find a nearly non-dispersing plasmon in the momentum-transfer range $q<0.35$ Å$^{-1}$. We argue that for a stoichiometric pure 2$H$-NbS$_2$ the dispersion relation is expected to have a negative slope as is the case for other transition-metal dichalcogenides. The presence of Cu impurities, required to stabilize the crystal growth, tends to shift the negative plasmon dispersion into a positive one, but the doping level in the current system is small enough to result in a nearly-non-dispersing plasmon. We conclude that a negative-slope plasmon dispersion is not connected with the existence of a charge-density-wave order in transition metal dichalcogenides.
The $q$-deformed Bogoliubov transformations
Creators: name: Arraut, Ivan
name: Segovia, Carlos
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: An approach for $q$-deformed Bogoliubov transformations is presented. Assuming a left-right module action together with an *-operation and deformed commutation relations, we construct a q-deformation of the nonlinear Bogoliubov transformation. Moreover we give a general result which can be applied in Quantum Field Theory. Finally, we introduce a Hopf structure when q is a root of unity.
description: Published version, 5 pages
Potential Induced Degradation (PID): Field Monitoring Data Evaluation and Climatic Chamber Tests with Field Modules
Creators: name: Mathiak, G.
name: Bogdanski, N.
name: Reil, F.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
PV Cells and Modules

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1898-1900
description: Potential-induced degradation (PID) can cause high yield losses in PV systems. Anti-PID measures shall be started as fast as possible to avoid unrecoverable modules and energy yield loss. In the presence of PID, the efficiency of module strings will decrease, especially at low irradiation, where the relative power loss is higher. An approach to detect PID based on monitoring data of PV strings is evaluated.
In the field, degraded modules are typically regenerated by anti-PID boxes which apply a positive potential during night time. Climatic chamber tests with PV modules which were PID-degraded in the field showed that some c-Si module types cannot be completely regenerated after severe degradation and that thin film CIGS modules can have reversible PID effects.
Guidelines for the Development of Abrasion-Resistant AR Coatings: Input from Modelling and Experimental Work
Creators: name: Cauchois, R.
name: Meuwissen, M.
name: Shen, C.
name: Keul, H.
name: Steeman, P.
name: Reardon, D.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
PV Cells and Modules

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 1868-1870
description: In this paper, the impact of abrasion on the performance of thin AR coatings over the years is studied
by the development of accelerated life tests. The analysis of the surface morphology after abrasion sheds light on the
different failure mechanisms that entail a loss of efficiency of the AR properties: ranging from a roughness
modification of the surface up to the total removal of the coating. Finite element modelling is used to define
guidelines for the development of abrasion-resistant coatings based on different scenarios like a modification of the
void fraction or of the pore size. The result of these simulations indicates that the void fraction of the coating has
significantly more impact on the hardness, than for example the void dimension. Simulations are confirmed
experimentally using accelerated abrasion tests, and emphasize that mechanical reinforcement strategies have to be
defined based on the lifetime requirements and the environmental conditions at the end-user location.
CT or P Problem and Symmetric Gapped Fermion Solution
Creators: name: Wang, Juven
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An analogous "Strong CP problem" is identified in a toy model in 2-dimensional spacetime: a general 1+1d abelian U(1) anomaly-free chiral fermion and chiral gauge theory with a generic theta instanton term $\fracθ{2 π} \int F$. The theta term alone violates the charge-conjugation-time-reversal CT and the parity P discrete symmetries. The analogous puzzle here is the CT or P problem in 1+1d: Why can the $\barθ$ angle (including the effect of $θ$ and the complex phase of a mass matrix) be zero or small for a natural reason? We show that this CT or P problem can be solved by a Symmetric Mass Generation mechanism (SMG, namely generating a mass or energy gap while preserving an anomaly-free symmetry). This 1+1d toy model mimics several features of the 3+1d Standard Model: chiral matter content, confinement, and Anderson-Higgs-induced mass by Yukawa-Higgs term. One solution replaces some chiral fermion's Higgs-induced mean-field mass with SMG-induced non-mean-field mass. Another solution enriches this toy model by introducing several new physics beyond the Standard Model: a parity-reflection PR discrete symmetry maps between the chiral and mirror fermions as fermion doubling localized on two domain walls at high energy, and SMG dynamically generates mass to the mirror fermion while still preserving the anomaly-free chiral symmetry at an intermediate energy scale, much before the Higgs mechanism generates mass to the chiral fermion at lower energy. Without loss of generality, an arguably simplest 1+1d U(1) symmetric anomaly-free chiral fermion/gauge theory (e.g., Weyl fermions with $3_L$-$4_L$-$5_R$-$0_R$ U(1) charges) is demonstrated. As an analogy to the superfluid-insulator or order-disorder quantum phase transition, in contrast to the Peccei-Quinn solution sitting in the (quasi-long-range-order) superfluid phase, our solution is in the SMG insulator disordered phase.
description: 28 pages. Two classes of solutions, without or with the mirror fermion sector. A companion to arXiv:2212.14036. Related models: arXiv:1307.7480, arXiv:1807.05998, arXiv:2202.12355. v3: More misprints corrected. New refinement and clarification upon the Physical Review D version
Exploring integrability-chaos transition with a sequence of independent perturbations
Creators: name: Yurovsky, Vladimir A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A gas of interacting particles is a paradigmatic example of chaotic systems. It is shown here that even if all but one particle are fixed in generic positions, the excited states of the moving particle are chaotic. They are characterized by the number of principal components (NPC) -- the number of integrable system eigenstates involved into the non-integrable one, which increases linearly with the number of strong scatterers. This rule is a particular case of the general effect of an additional perturbation on the system chaotic properties. The perturbation independence criteria supposing the system chaoticity increase are derived here as well. The effect can be observed in experiments with photons or cold atoms as the decay of observable fluctuation variance, which is inversely proportional to NPC, and, therefore, to the number of scatterers. This decay indicates that the eigenstate thermalization is approached. The results are confirmed by numerical calculations for a harmonic waveguide with zero-range scatterers along its axis.
description: Main text and supplemental material, 8 pages, 3 figures, final submitted version
Understanding Dynamics in Coarse-Grained Models: I. Universal Excess Entropy Scaling Relationship
Creators: name: Jin, Jaehyeok
name: Schweizer, Kenneth S.
name: Voth, Gregory A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Coarse-grained (CG) models facilitate an efficient exploration of complex systems by reducing the unnecessary degrees of freedom of the fine-grained (FG) system while recapitulating major structural correlations. Unlike structural properties, assessing dynamic properties in CG modeling is often unfeasible due to the accelerated dynamics of the CG models, which allows for more efficient structural sampling. Therefore, the ultimate goal of the present series of articles is to establish a better correspondence between the FG and CG dynamics. To assess and compare dynamical properties in the FG and the corresponding CG models, we utilize the excess entropy scaling relationship. For Paper I of this series, we provide evidence that the FG and the corresponding CG counterpart follow the same universal scaling relationship. By carefully reviewing and examining the literature, we develop a new theory to calculate excess entropies for the FG and CG systems while accounting for entropy representability. We demonstrate that the excess entropy scaling idea can be readily applied to liquid water and methanol systems at both the FG and CG resolutions. For both liquids, we reveal that the scaling exponents remain unchanged from the coarse-graining process, indicating that the scaling behavior is universal for the same underlying molecular systems. Combining this finding with the concept of mapping entropy in CG models, we show that the missing entropy plays an important role in accelerating the CG dynamics.
description: 31 pages, 9 figures