cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
EDUCATIONAL ALCHEMY: BRUNER AND TYLER RESHAPING LEARNING STRUCTURES
Creators: name: Eleanor, Marie Thompson
name: Benjamin, Thomas Mitchell
Publisher: name: America serial
Year: 2024
Subjects: Science Education
Curriculum Development
Jerome Bruner
Ralph Tyler
Educational Paradigms

description: In 1959, a pivotal meeting of thirty-five scholars and educators convened to address the enhancement of science education, sponsored by the National Academy of Science. Jerome Bruner, an influential American psychologist, encapsulated the outcomes of this meeting in his seminal work, "The Process of Education" (1960). This groundbreaking text underscored the significance of imparting a profound understanding of the substance and methodology of science to students. Bruner's emphasis on the structure paved the way for significant advancements in curriculum development, leaving an indelible mark not only on science education but on education as a whole. The conference explored fundamental processes essential for cultivating a sense of scientific understanding among students. The insights derived from this ten-day meeting resonated beyond the realm of science, influencing broader educational paradigms. Bruner's work catalyzed a paradigm shift, steering the focus towards the structural aspects of education. This shift had a lasting impact, leading to the evolution of curriculum development methodologies that went beyond traditional approaches. Simultaneously, in 1957, Ralph Tyler, another prominent American scholar, articulated his unique perspective on curriculum, defining it as "the learning experiences planned and directed by the school to attain its educational goals" (Tyler, 1975). Tyler's contribution added another layer to the discourse on curriculum development, emphasizing the intentional planning and direction of learning experiences within educational institutions. His definition encapsulated the essence of curriculum as a dynamic tool aligned with the broader objectives of education. This abstract encapsulates the transformative period in the mid-twentieth century when educational scholars actively sought to redefine science education. The confluence of ideas at the 1959 meeting set the stage for significant developments, with Bruner and Tyler emerging as key figures shaping the discourse on education and curriculum. The interplay of their perspectives laid the groundwork for a more nuanced understanding of curriculum design, steering education towards a holistic approach that extended beyond the confines of science education
Thermal equilibrium in Gaussian dynamical semigroups
Creators: name: Toscano, Fabricio
name: Nicacio, Fernando
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We characterize all Gaussian dynamical semigroups in continuous variables quantum systems of n-bosonic modes which have a thermal Gibbs state as a stationary solution. This is performed through an explicit relation between the diffusion and dissipation matrices, which characterize the semigroup dynamic, and the covariance matrix of the thermal equilibrium state. We also show that Alicki's quantum detailed-balance condition, based on a Gelfand-Naimark-Segal inner product, allows the determination of the temperature dependence of the diffusion and dissipation matrices, and the identification of different Gaussian dynamical semigroups which shares the same thermal equilibrium state.
description: 18 pages; Published version
Energy Rating of Crystalline Solar Modules: Investigation of Uncertainties due to Binning in Mass Production
Creators: name: Kleiss, G.
name: Schülbe, H.
name: Nacke, B.
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; 2244-2247
description: In the light of growing contribution of renewable energy (RE) to the global energy supply, the
assessment of energy production of RE technologies becomes most important. In the case of electricity-related RE
resources, such as photovoltaics (PV), wind, biomass, and CSP often total yearly energy production is the economic
driver for RE projects and the prediction of this estimated yearly energy production is an important tool in the design
of RE projects. Such judgements on energy production are obviously dependent both on the device’s parameters and
on factors related to installation site and system type. This study focuses on PV and the newly published “Energy
Rating” standard IEC 61853, which specifies comparatively close limitations for PV module characterization.
However, even within the required close set of data points serving as input for the calculations, variations of the
predicted energy yield (the output) are possible. The impact on the precision of the energy yield prediction arising
from production tolerances of module mass production is investigated. Statistical models for parameter variation as
well as other numerical models are applied. A considerable uncertainty due to scatter in production parameter is
revealed and conclusive recommendations are presented.
Secure Index Coding: Existence and Construction
Creators: name: Ong, Lawrence
name: Vellambi, Badri N.
name: Yeoh, Phee Lep
name: Kliewer, Jörg
name: Yuan, Jinhong
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We investigate the construction of weakly-secure index codes for a sender to send messages to multiple receivers with side information in the presence of an eavesdropper. We derive a sufficient and necessary condition for the existence of index codes that are secure against an eavesdropper with access to any subset of messages of cardinality $t$, for any fixed $t$. In contrast to the benefits of using random keys in secure network coding, we prove that random keys do not promote security in three classes of index-coding instances.
description: Author final manuscript (to be presented at the 2016 IEEE International Symposium on Information Theory)
MCD-finite Domains and Ascent of IDF Property in Polynomial Extensions
Creators: name: Eftekhari, Sina
name: Khorsandi, Mahdi Reza
Publisher: name: arXiv
Year: 2016
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13B25, 13F15, 13F20, 13G05

description: An integral domain is said to have the IDF property when every non-zero element of it has only a finite number of non-associate irreducible divisors. A counterexample has already been found showing that IDF property does not necessarily ascend in polynomial extensions. In this paper, we introduce a new class of integral domains, called MCD-finite domains, and show that for any domain $D$, $D[X]$ is an IDF domain if and only if $D$ is both IDF and MCD-finite. This result entails all the previously known sufficient conditions for the ascent of the IDF property. Our new characterization of polynomial domains with the IDF property enables us to use a different construction and build another counterexample which strengthen the previously known result on this matter.
description: To appear in Communications in Algebra
Application of numerical continuation to compute all solutions of semilinear elliptic equations
Creators: name: Allgower, Eugene
name: Cruceanu, Stefan-Gicu
name: Tavener, Simon
Publisher: name: Kooperation de Gruyter
Year: 2009

description: We adapt numerical continuation methods to compute all solutions of finite difference discretizations of nonlinear boundary value problems involving the Laplacian in two dimensions. New solutions on finer meshes are obtained from solutions on coarser meshes using a complex homotopy deformation. Two difficulties arise. First, the number of solutions typically grows with the number of mesh points and some form of filtering becomes necessary. Secondly, bifurcations may occur along homotopy paths of solutions and efficient methods to swap branches are developed when the mappings are analytic. For polynomial nonlinearities we generalize an earlier strategy for finding all solutions of two-point boundary value problems in one dimension and then introduce exclusion algorithms to extend the method to general nonlinearities.
Reliability of analog quantum simulation
Creators: name: Sarovar, Mohan
name: Zhang, Jun
name: Zeng, Lishan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Analog quantum simulators (AQS) will likely be the first nontrivial application of quantum technology for predictive simulation. However, there remain questions regarding the degree of confidence that can be placed in the results of AQS since they do not naturally incorporate error correction. Specifically, how do we know whether an analog simulation of a quantum model will produce predictions that agree with the ideal model in the presence of inevitable imperfections? At the same time, there is a widely held expectation that certain quantum simulation questions will be robust to errors and perturbations in the underlying hardware. Resolving these two points of view is a critical step in making the most of this promising technology. In this work we formalize the notion of AQS reliability by determining sensitivity of AQS outputs to underlying parameters, and formulate conditions for robust simulation. Our approach naturally reveals the importance of model symmetries in dictating the robust properties. To demonstrate the approach, we characterize the robust features of a variety of quantum many-body models.
description: 9 pages + Appendices. Comments welcome
Intrinsic spin orbit torque in a single domain nanomagnet
Creators: name: Kalitsov, A.
name: Nikolaev, S. A.
name: Velev, J.
name: Chshiev, M.
name: Mryasov, O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present theoretical studies of the intrinsic spin orbit torque (SOT) in a single domain ferromagnetic layer with Rashba spin-orbit coupling (SOC) using the non-equilibrium Green's function formalism for a model Hamiltonian. We find that, to the first order in SOC, the intrinsic SOT has only the field-like torque symmetry and can be interpreted as the longitudinal spin current induced by the charge current and Rashba field. We analyze the results in terms of the material related parameters of the electronic structure, such as band filling, band width, exchange splitting, as well as the Rashba SOC strength. On the basis of these numerical and analytical results, we discuss the magnitude and sign of SOT. Our results show that the different sign of SOT in identical ferromagnetic layers with different supporting layers, e.g. Co/Pt and Co/Ta, could be attributed to electrostatic doping of the ferromagnetic layer by the support.
description: 10 pages, 2 figures
The investigations of the $P$-wave $B_s$ states combining quark model and lattice QCD in the coupled channel framework
Creators: name: Yang, Zhi
name: Wang, Guang-Juan
name: Wu, Jia-Jun
name: Oka, Makoto
name: Zhu, Shi-Lin
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Combining the quark model, the quark-pair-creation mechanism and $B^{(*)}\bar K$ interaction, we have investigated the near-threshold $P$-wave $B_s$ states in the framework of the Hamiltonian effective field theory. With the heavy quark flavor symmetry, all the parameters are determined in the $D_s$ sector by fitting the lattice data. The masses of the bottom-strange partners of the $D^{*}_{s0}(2317)$ and $D^{*}_{s1}(2460)$ are predicted to be $M_{B^{*}_{s0}}=5730.2_{-1.5}^{+2.4}$ MeV and $M_{B^{*}_{s1}}= 5769.6_{-1.6}^{+2.4}$ MeV, respectively, which are well consistent with the lattice QCD simulation. The two $P$-wave $B_s$ states are the mixtures of the bare $\bar b s$ core and $B^{(*)}\bar K$ component. Moreover, we find a crossing point between the energy levels with and without the interaction Hamiltonian in the finite volume spectrum in the $0^+$ case, which corresponds to a CDD (Castillejo-Dalitz-Dyson) zero in the $T$-matrix of the $B\bar K$ scattering. This CDD zero will help deepen the insights of the near-threshold states and can be examined by future lattice calculation.
description: 20 pages, 4 figures. Version accepted by JHEP
Investigation of the Influence of Temperature Inhomogeneity on the Measurement Uncertainty of Solar Cell Temperature Coefficients
Creators: name: Schweitzer, A.
name: Kröger, I.
name: Winter, 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; 2200-2203
description: In this study we characterize a newly developed solar cell chuck of PTB for suitability of temperature dependent
measurements. We investigate the relative temperature distribution on a tempered solar cell and the temperature offset
between the solar cell and the PT100 sensor which is used for temperature regulation. We adjusted the setpoint
temperature from TSP=15 °C up to 75 °C and measured the relative temperature distribution with an infrared camera.
Performing temperature dependent differential spectral responsivity (DSR) measurements, we determined the spectral
temperature coefficient of an exemplary silicon solar cell. With these data we can derive the influence of the temperature
inhomogeneity on the measurement uncertainty. Non-irradiated we measured the absolute temperature with sixteen
calibrated PT100 sensors distributed on the solar cell’s surface. Applying the open circuit method (VOC-method) we
investigated the influence of incident irradiation on the temperature behavior of the solar cell chuck and the solar cell. We
found out that the highest uncertainty contribution arises through the calibration of the integrated PT100 sensors of the
chuck.
Screening 0D materials for 2D nanoelectronics applications
Creators: name: Bagheri, Mohammad
name: Komsa, Hannu-Pekka
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: As nanoelectronic devices based on two-dimensional (2D) materials are moving towards maturity, optimization of the properties of the active 2D material must be accompanied by equal attention to optimizing the properties of and the interfaces to the other materials around it, such as electrodes, gate dielectrics, and the substrate. While these are usually either 2D or 3D materials, recently K. Liu et al. [Nat. Electron. 4, 906 (2021)] reported on the use of zero-dimensional (0D) material, consisting of vdW-bonded Sb$_2$O$_3$ clusters, as a highly promising insulating substrate and gate dielectric. Here, we report on computational screening study to find promising 0D materials for use in nanoelectronics applications, in conjunction with 2D materials in particular. By combining a database and literature searches, we found 16 materials belonging to 6 structural prototypes with high melting points and high band gaps, and a range of static dielectric constants. We carried out additional first-principles calculations to evaluate selected technologically relevant material properties, and confirmed that all these materials are van der Waals-bonded, thus allowing for facile separation of 0D clusters from the 3D host and also weakly perturbing the electronic properties of the 2D material after deposition.
description: 10 pages, 3 figures
The Si-Traceable Calibration of Shunted Reference Solar Cells via Differential Spectral Responsivity Measurements
Creators: name: Witt, F.
name: Kröger, I.
name: Winter, 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; 2197-2199
description: Shunted reference solar cells are commonly used to determine and to monitor the irradiance at outdoor solar cell testing
facilities, because they allow the convenient measurement of a voltage without current-to-voltage converter. This type of
reference solar cell contains a resistor with an only roughly known low resistance that is built in the housing and
connected to the cell, so that a voltage value proportional to the current of the solar cell under illumination can be
measured. Until now this type of reference solar cell was commonly calibrated using a sun simulator. A new significantly
improved voltage amplifier allows the application of precise differential spectral responsivity calibrations of such
devices. In this work the application and validation of a new calibration chain for the calibration of shunted reference
solar cells with lowest measurement uncertainties is presented. By the use of the new, high precision voltage amplifier
the DSR- method was transferred to shunted reference cells and a measurement uncertainty (MU) of the shunt voltage
under standard test conditions below 0.8 % with k=2 was achieved. To validate the calibration results two different SItraced
measurements, a direct calibration of both types of amplifier as well as a calibration with the combination of a
reference photodiode and a reference resistor were performed and compared.
Using Wilson flow to study the SU(3) deconfinement transition
Creators: name: Datta, Saumen
name: Gupta, Sourendu
name: Lytle, Andrew
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We explore the use of Wilson flow to study the deconfinement transition in SU(3) gauge theory. We use the flowed Polyakov loop as a renormalized order parameter for the transition, and use it to renormalize the Polyakov loop. We also study the flow properties of the electric and magnetic gluon condensates, and demonstrate that the difference of the flowed operators shows rapid change across the transition point.
description: 13 pages, 10 figures. Small changes in figures and discussion, results unchanged. Published version
Photovoltaic Modules Monitoring System Using a Wireless Sensor Network
Creators: name: Ortega, E.
name: Aranguren, G.
name: Sáenz, M.J.
name: Gutiérrez, R.
name: Jimeno, J.C.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Balance of System Components

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 2164-2168
description: In this work the first approach to a wireless sensor network for photovoltaic plant monitoring is presented. This network is designed to detect faults in each individual photovoltaic module of the plant and to localize physically without disconnecting it from the rest of the system. There will be one electronic circuit in parallel for each photovoltaic module and they will be connected to a central control unit with a Wireless Sensor Network. In this work the general wireless network, a first prototype of the electronic circuit for a single photovoltaic module monitoring and several experimental tests with this prototype are presented. The system was designed in terms of easy implementation and low cost, without any extra sensors.
Analysis of Air Mass Dependence of Three Photovoltaic Arrays
Creators: name: Wang, H.
name: Muñoz-García, M.A.
name: Moreda, G.P.
name: Alonso-García, M.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; 2221-2223
description: The solar spectrum, which is also could be described by air mass factor, has a significant relationship
with the performance of photovoltaic modules. The air mass dependence has been investigated by a theoretical
method as well as an actual case of three different photovoltaic arrays: polycrystalline silicon, amorphous silicon and
cadmium telluride, at the EUIT Agrícola-UPM (Madrid, Spain, 40.4426oN, 3.7295oW). The calculating results show
that: AM dependence of poly-Si array is positive because an elevating AM-value indicates a red shift and poly-Si
module is more red sensitive; On the contrary, as a-Si module and CdTe module are more blue sensitive, their AM
dependences are negative. Furthermore, the outdoor AM dependences of three arrays are corresponding to the
calculating results although the thermal annealing effect could be superimposed on spectral effect in the case of a-Si.
Comparing the Impact of the off-Grid System and on-Grid System on a Realistic Load
Creators: name: Algaddafi, A.
name: Alshahrani, J.
name: Hussain, S.
name: Elnaddab, K.
name: Diryak, E.
name: Daho, I.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Balance of System Components

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 2144-2150
description: The main features of the power electronic inverter are used to facilitate the integration of different renewable energy sources; the management of power flow between the generator, the load and the grid; and to provide a reasonable power quality to the grid or load. However, where the inverter output of the renewable energy resource fluctuates, such as the impact of cloudy weather on the solar system, this may lead to degradation in the efficiency and distortion of the power quality. Therefore, enhancing the power quality and designing an optimal solar system controller to improve the reliability, while taking into account the cost and output power are explored. The off-grid and on-grid systems were configured in the laboratory, with this paper studying the impact of the off-grid system on the non-linear load when compared with the on-grid system in terms of the power quality and output current distortion. The results reveal that the off-grid system has a lower effect on a load than the on-grid system. Therefore, the performance of the off-grid system is superior to the on-grid system. To evaluate the proposed system improvements achieved in the AC Mini-Grid system, the experimental works were implemented and validated by real-time measurements.
A Novel Suitable Resonant Filter to Improve the THD for a PV Inverter
Creators: name: El Bachtiri, R.
name: Khanfara, M.
name: El Hammoumi, K.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Balance of System Components

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 2161-2163
description: This paper presents a simple resonant filter for a PV inverter. We have considered a five level inverter to reduce THD of the output voltage. We have used an inverter control allowing the elimination of third and fifth harmonics. We have already shown, in a precedent study, that low pass filter is better than the tuned passive filter accorded to the seven harmonic. In this paper, we will compare performance of the low pass filter and the resonant series converter. Indeed, a resonant converter ensures a soft communication for electronic switch when it is adequately controlled. For comparing different cases, we have simulated the operation with PSIM and discussed the corresponding Total Harmonic Distortion (THD).
Twisted bialgebroids versus bialgebroids from a Drinfeld twist
Creators: name: Borowiec, Andrzej
name: Pachol, Anna
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Bialgebroids (resp. Hopf algebroids) are bialgebras (Hopf algebras) over noncommutative rings. Drinfeld twist techniques are particularly useful in the (deformation) quantization of Lie algebras as well as underlying module algebras (=quantum spaces). Smash product construction combines these two into the new algebra which, in fact, does not depend on the twist. However, we can turn it into bialgebroid in the twist dependent way. Alternatively, one can use Drinfeld twist techniques in a category of bialgebroids. We show that both techniques indicated in the title: twisting of a bialgebroid or constructing a bialgebroid from the twisted bialgebra give rise to the same result in the case of normalized cocycle twist. This can be useful for better description of a quantum deformed phase space. We argue that within this bialgebroid framework one can justify the use of deformed coordinates (i.e. spacetime noncommutativity) which are frequently postulated in order to explain quantum gravity effects.
description: 13 pages, version accepted for publication
Witten Index for Noncompact Dynamics
Creators: name: Lee, Seung-Joo
name: Yi, Piljin
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Among gauged dynamics motivated by string theory, we find many with gapless asymptotic directions. Although the natural boundary condition for ground states is $L^2$, one often turns on chemical potentials or supersymmetric mass terms to regulate the infrared issues, instead, and computes the twisted partition function. We point out how this procedure generically fails to capture physical $L^2$ Witten index with often misleading results. We also explore how, nevertheless, the Witten index is sometimes intricately embedded in such twisted partition functions. For $d=1$ theories with gapless continuum sector from gauge multiplets, such as non-primitive quivers and pure Yang-Mills, a further subtlety exists, leading to fractional expressions. Quite unexpectedly, however, the integral $L^2$ Witten index can be extracted directly and easily from the twisted partition function of such theories. This phenomenon is tied to the notion of the rational invariant that appears naturally in the wall-crossing formulae, and offers a general mechanism of reading off Witten index directly from the twisted partition function. Along the way, we correct early numerical results for some of $\mathcal N=4,8,16$ pure Yang-Mills quantum mechanics, and count threshold bound states for general gauge groups beyond $SU(N)$.
description: 54 pages, JHEP version, references updated with accompanying footnotes, an additional example added in Eq.(5.22)
Testing of Multi-MPPT PV Inverters: Approach and Test Results
Creators: name: Gfeller, D.
name: Muntwyler, U.
name: Borgna, L.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Balance of System Components

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 2138-2143
description: The European standard EN 50530 defines procedures for measuring the conversion and MPPT
efficiency of PV inverters. The standard has been released in 2010 when multi-MPPT PV inverters were not yet
widely-used. Therefore, the scope of EN 50530 is limited to PV inverters with only one MPP tracker. Today
however, multi-MPPT inverters have become a market standard. The question is now what tests are necessary to
obtain a good characterization for these devices. The easiest approach would be to simply use the test profiles defined
in EN 50530 on each of the inverter's inputs simultaneously. But by doing so, one would disregard the main purpose
of the multi-MPPT technology: to achieve a good performance under inhomogeneous conditions. Therefore,
measurements with different test profiles on each MPP tracker should be performed as well. This work proposes
some modifications for existing test standards and new methods for testing of multi-MPPT PV inverters. It also
presents actual measured data of real inverters, which have been tested on BFH's multi-MPPT inverter test bench.
Enhancing Germination and Seedling Vigor of Upland Rice Seed under Salinity and Water Stresses by Osmopriming
Creators: name: Siraprapa Brooks
Publisher: name: กองบริหารการวิจัย
Year: 2020
Subjects: Upland rice
Osmopriming
Seed germination
Moisture stress
Salt stress

description: Science & Technology Asia, 25, 2, 63-74
MLGOPerf: An ML Guided Inliner to Optimize Performance
Creators: name: Ashouri, Amir H.
name: Elhoushi, Mostafa
name: Hua, Yuzhe
name: Wang, Xiang
name: Manzoor, Muhammad Asif
name: Chan, Bryan
name: Gao, Yaoqing
Publisher: name: arXiv
Year: 2022
Subjects: subject: Programming Languages (cs.PL)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences
subject: I.2.5; D.3.0; I.2.6

description: For the past 25 years, we have witnessed an extensive application of Machine Learning to the Compiler space; the selection and the phase-ordering problem. However, limited works have been upstreamed into the state-of-the-art compilers, i.e., LLVM, to seamlessly integrate the former into the optimization pipeline of a compiler to be readily deployed by the user. MLGO was among the first of such projects and it only strives to reduce the code size of a binary with an ML-based Inliner using Reinforcement Learning. This paper presents MLGOPerf; the first end-to-end framework capable of optimizing performance using LLVM's ML-Inliner. It employs a secondary ML model to generate rewards used for training a retargeted Reinforcement learning agent, previously used as the primary model by MLGO. It does so by predicting the post-inlining speedup of a function under analysis and it enables a fast training framework for the primary model which otherwise wouldn't be practical. The experimental results show MLGOPerf is able to gain up to 1.8% and 2.2% with respect to LLVM's optimization at O3 when trained for performance on SPEC CPU2006 and Cbench benchmarks, respectively. Furthermore, the proposed approach provides up to 26% increased opportunities to autotune code regions for our benchmarks which can be translated into an additional 3.7% speedup value.
description: Version 2: Added the missing Table 6. The short version of this work is accepted at ACM/IEEE CASES 2022
N=1 Heterotic / F-Theory Duality
Creators: name: Andreas, Björn
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I
Year: 1998
Subjects: subject: Heterotischer String
subject: F-Theorie
subject: Calabi-Yau Mannigfaltigkeiten
subject: Vektorbündle
subject: heterotic string
subject: F-theory
subject: Calabi-Yau manifolds
subject: vector bundles
subject: 530 Physik
subject: 29 Physik, Astronomie
subject: UO 4065

description: In dieser Arbeit werden Aspekte der N = 1 Dualität zwischen dem Heterotischen String (der auf einer komplex dreidimensionalen Calabi-Yau Mannigfaltigkeit mit einem Vektorbündel kompaktifiziert wird) und der F-Theorie (die auf einer komplex vierdimensionalen Calabi-Yau Mannigfaltigkeit kompaktifiziert wird) diskutiert. Zu Beginn wird eine allgemeine Beschreibung der Stringdualitäten gegeben. Die Berech- nungen der notwendigen Calabi-Yau Mannigfaltigkeiten- und Vektorbündeldaten, welche Charakteristische Klassen und Bündelmoduli involvieren, werden im Detail durchgeführt. Die acht- bzw. sechsdimensionale Dualität zwischen dem Heterotis- chen String und der F-Theorie wird diskutiert. Im Anschluß erfolgt ein Vergleich der vierdimensionalen Spektren (dies involviert den Vergleich von N = 1 chiralen Multipletts) und ein Vergleich der Anomaliebedingungen (welche zu konsistenten vierdimensionalen Het/F-Theorie Kompaktifizierungen führen). Weiterhin werden vierdimensionale N = 1 Het/F-Theorie Beispiele konstruiert, insbesondere wird eine Klasse von elliptisch gefaserten Calabi-Yau's über del Pezzoflächen betrachtet.
description: We discuss aspects of N = 1 duality between the heterotic string compactified on a Calabi-Yau threefold with a vector bundle and F-theory on a Calabi-Yau fourfold. After a description of string duality intended for the non-specialist the framework and the constraints for heterotic/F-theory compactifications are presented. The computations of the necessary Calabi-Yau manifold and vector bundle data, involving characteristic classes and bundle moduli, are given in detail. The eight- and six- dimensional dualities are reviewed. The matching of the spectrum of chiral multiplets and of the number of heterotic five-branes respectively F-theory three-branes, needed for anomaly cancellation in four-dimensional vacua, is pointed out. Several examples of four-dimensional dual pairs are constructed where on both sides the geometry of the involved manifolds relies on del Pezzo surfaces.
A Sublinear-Time Quantum Algorithm for Approximating Partition Functions
Creators: name: Cornelissen, Arjan
name: Hamoudi, Yassine
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Complexity (cs.CC)
subject: Data Structures and Algorithms (cs.DS)
subject: Statistics Theory (math.ST)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We present a novel quantum algorithm for estimating Gibbs partition functions in sublinear time with respect to the logarithm of the size of the state space. This is the first speed-up of this type to be obtained over the seminal nearly-linear time algorithm of Štefankovič, Vempala and Vigoda [JACM, 2009]. Our result also preserves the quadratic speed-up in precision and spectral gap achieved in previous work by exploiting the properties of quantum Markov chains. As an application, we obtain new polynomial improvements over the best-known algorithms for computing the partition function of the Ising model, counting the number of $k$-colorings, matchings or independent sets of a graph, and estimating the volume of a convex body. Our approach relies on developing new variants of the quantum phase and amplitude estimation algorithms that return nearly unbiased estimates with low variance and without destroying their initial quantum state. We extend these subroutines into a nearly unbiased quantum mean estimator that reduces the variance quadratically faster than the classical empirical mean. No such estimator was known to exist prior to our work. These properties, which are of general interest, lead to better convergence guarantees within the paradigm of simulated annealing for computing partition functions.
description: 24 pages; v2: improved Theorem 3.3 and volume estimation
Design and PIL Simulation of an AEKF for Real Time Battery SOC Estimation Using ARM Based Core
Creators: name: Gaga, A.
name: Diouri, O.
name: Cheddadi, Y.
name: Errahimi, F.
name: Es-Sbai, N.
Publisher: name: WIP
Year: 2016
Subjects: Operation, Performance, Reliability and Sustainability of Photovoltaics
Balance of System Components

description: 32nd European Photovoltaic Solar Energy Conference and Exhibition; 2151-2157
description: Battery management system (BMS) is an electronic system responsible for all control and management operations of various battery parameters, especially SOC. The battery SOC estimation process is one of the most complicated techniques due to the fact that battery chemistry is a time variant system with a strong non linearity. An EKF algorithm is adopted to estimate internal states of complex systems. In this paper we have chosen to dynamically estimate the SOC by decreasing divergence due to parametric uncertainty of battery model, measurement and process noise. To further enhance this algorithm an adaptive calculation of noise covariance is proposed to combine between a better convergence and robust results. For the implementation one of the powerful microcontrollers in the market is used, the STM32F4 ARM based core combining low cost and high performances with DSP and FPU capability. To validate the simulation results for real implementation, a PIL configuration is made to use a real hardware target within a simulation process. The obtained results demonstrate that the AEKF and ARM based core processor are the best hardware and algorithm combination to estimate an accurate battery SOC with the best real time constraint targeted electrical storage market especially EV and autonomous photovoltaic systems.
Wannier functions and Z_2 invariants in time-reversal symmetric topological insulators
Creators: name: Cornean, Horia D.
name: Monaco, Domenico
name: Teufel, Stefan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences
subject: 35J10, 81Q70

description: We provide a constructive proof of exponentially localized Wannier functions and related Bloch frames in 1- and 2-dimensional time-reversal symmetric (TRS) topological insulators. The construction is formulated in terms of periodic TRS families of projectors (corresponding, in applications, to the eigenprojectors on an arbitrary number of relevant energy bands), and is thus model-independent. The possibility to enforce also a TRS constraint on the frame is investigated. This leads to a topological obstruction in dimension 2, related to $\mathbb{Z}_2$ topological phases. We review several proposals for $\mathbb{Z}_2$ indices that distinguish these topological phases, including the ones by Fu--Kane [Phys. Rev. B 74 (2006), 195312], Prodan [Phys. Rev. B 83 (2011), 235115], Graf--Porta [Commun. Math. Phys. 324 (2013), 851] and Fiorenza--Monaco--Panati [Commun. Math. Phys., in press]. We show that all these formulations are equivalent. In particular, this allows to prove a geometric formula for the the $\mathbb{Z}_2$ invariant of 2-dimensional TRS topological insulators, originally indicated in [Phys. Rev. B 74 (2006), 195312], which expresses it in terms of the Berry connection and the Berry curvature.
description: 54 pages, 5 figures. Minor changes with respect to v1, including an updated bibliography. This version is published in Rev. Math. Phys
Shrinking the Semantic Gap: Spatial Pooling of Local Moment Invariants for Copy-Move Forgery Detection
Creators: name: Wang, Chao
name: Huang, Zhiqiu
name: Qi, Shuren
name: Yu, Yaoshen
name: Shen, Guohua
name: Zhang, Yushu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Copy-move forgery is a manipulation of copying and pasting specific patches from and to an image, with potentially illegal or unethical uses. Recent advances in the forensic methods for copy-move forgery have shown increasing success in detection accuracy and robustness. However, for images with high self-similarity or strong signal corruption, the existing algorithms often exhibit inefficient processes and unreliable results. This is mainly due to the inherent semantic gap between low-level visual representation and high-level semantic concept. In this paper, we present a very first study of trying to mitigate the semantic gap problem in copy-move forgery detection, with spatial pooling of local moment invariants for midlevel image representation. Our detection method expands the traditional works on two aspects: 1) we introduce the bag-of-visual-words model into this field for the first time, may meaning a new perspective of forensic study; 2) we propose a word-to-phrase feature description and matching pipeline, covering the spatial structure and visual saliency information of digital images. Extensive experimental results show the superior performance of our framework over state-of-the-art algorithms in overcoming the related problems caused by the semantic gap.
description: Accepted by IEEE Transactions on Information Forensics and Security, 2023, https://ieeexplore.ieee.org/document/10007894
Annual Yield Comparison of Module Level Power Electronics and String Level PV Systems with Standard and Advanced Module Design
Creators: name: Sinapis, K.
name: Rooijakkers, T.T.H.
name: Tzikas, C.
name: Litjens, G.B.M.A.
name: Van Den Donker, M.N.
name: Folkerts, W.
name: Van Sark, W.G.J.H.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; 2011-2015
description: This study focuses on the partial shade-mitigating effects related to the insertion of additional ideal bypass
diodes in residential-scale photovoltaic (PV) systems. For this purpose, quantification of the resulting energy
yield benefits is carried out in a representative residential environment. It is widely recognized that partial shading
inflicts disproportional losses to the energy output of PV systems. Increased granularity levels in cell groups are
perceived as a potentially promising measure to increase the shade-tolerance of photovoltaic devices. The past years,
introduction of module level electronics promise to reduce further shading losses. The developed model includes a
shading evaluation of the installation with means of 3D modeling, insertion of additional by pass diodes resulting in
smaller cell groups, irradiance calculations, PV cell modelling and finally an empirical power conversion model.
Results suggest that in the reference case of 3 by pass diodes the micro inverter system is performing the best under
partial shading. By increasing the cell group granularity the string inverter systems seems to benefit due to the wide
maximum power point voltage window.
Education, daily routine, and prospects of primary school teachers in Haiti
Creators: name: Thiel, Gertrud
Publisher: name: Humboldt-Universität zu Berlin, Philosophische Fakultät IV
Year: 2009
Subjects: subject: Grundschullehrer
subject: ländliches Haiti
subject: Lehrerfortbildung
subject: interkulturelle Erfahrung
subject: Primary school teachers
subject: rural Haiti
subject: in-service teacher training
subject: cross-cultural experience
subject: 370 Erziehung, Schul- und Bildungswesen
subject: 22 Erziehung, Bildung, Unterricht
subject: DV 2310

description: Ausgehend von narrativen Interviews, Beobachtungen und gemeinsamen Erfahrungen während eines interkulturellen Lehrerfortbildungsprojekts im ländlichen Haiti wird in dieser Arbeit ein detailliertes Bild der Lebenswelt ausgewählter haitianischer Grundschullehrer/-innen gezeichnet. Insbesondere wird den Fragen nachgegangen, welchen Hindernissen diese Lehrer/-innen in ihrer eigenen Ausbildung begegneten, welche professionellen und sozialen Herausforderungen ihre alltägliche Berufsausübung mit sich bringt und wie ein genaues Verstehen ihres Hintergrunds und ihres Alltags dazu beitragen kann, sowohl die Qualität ihres Unterrichts als auch ihre sozio-ökonomischen Aussichten zu verbessern. Verspätete und unzureichende Ausbildung, ein geringer Verdienst und herausfordernde Arbeitsbedingungen, sowie weitgehende Vernachlässigung durch den Staat kennzeichnen die Realität dieser Lehrer/-innen. Dennoch zeigen sie Elan und vertrauen auf eine bessere Zukunft. In dieser Studie kommen die haitianischen Lehrer/-innen selber zu Wort. Darüber hinaus wird der Prozess der interkulturellen Kommunikation und Reflexion, der mit einem solchen Projekt und einer derartigen Recherche einhergeht dokumentiert.
description: This study offers a detailed description of selected Haitian primary school teachers’ living and working conditions based on narrative interviews, observations, and common experiences during a cross-cultural in-service teacher training program in rural Haiti. The research is focused on the following questions: What type of obstacles did primary school teachers in rural Haiti encounter in their own education, what professional and social challenges are faced in the daily routines of these teachers, and how can a thorough knowledge of both their backgrounds and the conditions of their current lives help to improve the quality of their teaching as well as their prospects for socio-economic advancement? The reality of these teachers is characterized by a delayed and limited education, low remuneration and challenging working conditions, as well as a more or less complete lack of state support. Nevertheless, they demonstrate vitality and trust in a better future. Central to this study are the Haitian teachers’ viewpoints, but the process of cross-cultural communication and reflection going on during such a program and research is documented as well.
The resolvent algebra for oscillating lattice systems: Dynamics, ground and equilibrium states
Creators: name: Buchholz, Detlev
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Operator Algebras (math.OA)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Within the C*-algebraic framework of the resolvent algebra for canonical quantum systems, the structure of oscillating lattice systems with bounded nearest neighbor interactions is studied in any number of dimensions. The global dynamics of such systems acts on the resolvent algebra by automorphisms and there exists a (in any regular representation) weakly dense subalgebra on which this action is pointwise norm continuous. Based on this observation, equilibrium (KMS) states as well as ground states are constructed which are shown to be regular. It is also indicated how to deal with singular interactions and non-harmonic oscillations.
description: 32 pages, no figures; v2 - v5: some additions to introduction and main text, typos corrected. v6: typos corrected, version as to appear in Commun. Math. Phys
Comperative Performance Investigation of Mono, Poly-Crystalline and Amorphous Silicon Photovoltaic Modules Under Northern Morocco Climate Conditions
Creators: name: Attari, K.
name: El Yaakoubi, A.
name: Leemrani, Z.
name: Asselman, A.
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; 2093-2097
description: In this paper, a PV system installed in Tetouan’s faculty is investigated , its total capacity is 5.86 Kwp
and comprises three types technologies modules, monocrystalline (m-Si) , polycrystalline (p-Si) and amorphous (a-
Si). The purpose of this study is to give real and simulated results, real results based on climate data and by
monitoring the PV system during the year 2015 and simulated data by the PVsyst software. Those results can be used
to make more appropriate technology choice in similar climate.