cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Numerical analysis of a self-similar turbulent flow in Bose--Einstein condensates
Creators: name: Semisalov, B. V.
name: Grebenev, V. N.
name: Medvedev, S. B.
name: Nazarenko, S. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study a self-similar solution of the kinetic equation describing weak wave turbulence in Bose-Einstein condensates. This solution presumably corresponds to an asymptotic behavior of a spectrum evolving from a broad class of initial data, and it features a non-equilibrium finite-time condensation of the wave spectrum $n(ω)$ at the zero frequency $ω$. The self-similar solution is of the second kind, and it satisfies boundary conditions corresponding to a nonzero constant spectrum (with all its derivative being zero) at $ω=0$ and a power-law asymptotic $n(ω) \to ω^{-x}$ at $ω\to \infty \;\; x\in \mathbb{R}^+$. Finding it amounts to solving a nonlinear eigenvalue problem, i.e. finding the value $x^*$ of the exponent $x$ for which these two boundary conditions can be satisfied simultaneously. To solve this problem we develop a new high-precision algorithm based on Chebyshev approximations and double exponential formulas for evaluating the collision integral, as well as the iterative techniques for solving the integro-differential equation for the self-similar shape function. This procedures allow to achieve a solution with accuracy $\approx 4.7 \%$ which is realized for $x^* \approx 1.22$.
Voltage Balancing Capability of Grid-Forming Inverters
Creators: Taehyung Kim
Nicholas G. Barry
Woosung Kim
Surya Santoso
Wenzong Wang
Roger C. Dugan
and Deepak Ramasubramanian
Publisher: name: IEEE
Year: 2022

The objective of this paper is to analyze and identify the range of voltage balancing capability of grid-forming inverters serving three-phase unbalanced loads.
The objective of this paper is to analyze and identify the range of voltage balancing capability of grid-forming inverters serving three-phase unbalanced loads. These inverters are designed to compensate for voltage imbalance by controlling the negative-sequence components of voltage and current. However, the magnitude of the negative-sequence current an inverter can supply is limited by its relatively low rated current. Moreover, it becomes more challenging to estimate the amount of current needed for an unbalanced load when the inverter is interfaced using a delta-wye grounded interconnection transformer. Therefore, we investigate the range of negative-sequence current the inverter can supply and derive formulas to determine the minimum inverter's capacity required to compensate for voltage imbalance while supplying unbalanced loads connected through a delta-wye grounded transformer. The proposed formulas can be used to estimate the capacity of an inverter in lieu of detailed analyses and electromagnetic transient simulations. The proposed equation is implemented in small and large scale microgrid systems and validated using a detailed model developed in PSCAD/EMTDC.
title: Inheriting the other : an aesthetic of postcolonial custodianship
Creators: name: Menozzi, Filippo
Publisher: name: University of Kent
Year: 2021

description: This study provides a response to current controversies in postcolonial studies. While recent interventions have proposed a rerouting or reconstruction of the postcolonial, this research argues that the postcolonial could be redefined as a form of custodianship. Indeed, this notion has not yet been recognised as such, but it has always been a central issue in postcolonial criticism. It has been adopted to portray the postcolonial intellectual as "custodian" or doorkeeper, in the derogatory sense of someone who claims to represent the essence of a culture. Yet custodianship does not correspond to the authority of cultural representation. Instead, it might be the fidelity to an ethical imperative, a responsibility for the other in forms of cultural and literary inheritance. For this reason, it is not something that needs to be formulated as an abstract theory, but rather it can be learned as a practice through the reading of literary and poetic forms. The aesthetic of custodianship presented in this research detects modes of transmission in the figurative, rather than strictly thematic aspects of canonical and non-canonical postcolonial literary objects. The thesis engages with influential postcolonial authors: Anita Desai, Mahasweta Devi, Gayatri Chakravorty Spivak, Arundhati Roy, and a young tribal artist, Bhajju Shyam, whose work has received no extensive attention in the postcolonial discourse. This inquiry illustrates that the postcolonial has addressed, and continues to address, a crucial problematic about how to transmit, to read and to inherit, not only one's own tradition, but also legacies of the other. The postcolonial could still be relevant today as an aesthetic of custodianship, that is, as an understanding of literature itself as a practice of poetic transmission able to weave figuration and worldliness in a common ground.
Meta-Stable Brane Configurations of Triple Product Gauge Groups
Creators: name: Ahn, Changhyun
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: From an N=1 supersymmetric electric gauge theory with the gauge group SU(N_c) x SU(N_c') x SU(N_c'') with fundamentals for each gauge group and the bifundamentals, we apply Seiberg dual to each gauge group and obtain the N=1 supersymmetric dual magnetic gauge theories with dual matters including the additional gauge singlets. By analyzing the F-term equations of the dual magnetic superpotentials, we describe the intersecting brane configurations of type IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of this gauge theory. We apply also to the case for N=1 supersymmetric electric gauge theory with the gauge group Sp(N_c) x SO(2N_c') x Sp(N_c'') with flavors for each gauge group and the bifundamentals. Finally, we describe the meta-stable brane configurations of multiple product gauge groups.
description: 80pp, 10 figures; shorten the draft and to appear in IJMPA
Wichtige Archive und Bibliotheken zur Erforschung der Geschichte der Arbeiterbewegung in Großbritannien - eine Übersicht
Creators: name: Schulze, Rainer
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Wichtige Archive und Bibliotheken zur Erforschung der Geschichte der Arbeiterbewegung in Großbritannien - eine Übersicht" of MTS 11 (1991).
description: Moving the Social, Vol 11 (1991): Arbeiterschaft und Arbeiterbewegung in Großbritannien. Forschungsstand und Perspektiven der Forschung
Implementing a foveal-pit inspired filter in a Spiking Convolutional Neural Network: a preliminary study
Creators: name: Gupta, Shriya T. P.
name: Bhattacharya, Basabdatta Sen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.10; I.4.5; I.4.10

description: We have presented a Spiking Convolutional Neural Network (SCNN) that incorporates retinal foveal-pit inspired Difference of Gaussian filters and rank-order encoding. The model is trained using a variant of the backpropagation algorithm adapted to work with spiking neurons, as implemented in the Nengo library. We have evaluated the performance of our model on two publicly available datasets - one for digit recognition task, and the other for vehicle recognition task. The network has achieved up to 90% accuracy, where loss is calculated using the cross-entropy function. This is an improvement over around 57% accuracy obtained with the alternate approach of performing the classification without any kind of neural filtering. Overall, our proof-of-concept study indicates that introducing biologically plausible filtering in existing SCNN architecture will work well with noisy input images such as those in our vehicle recognition task. Based on our results, we plan to enhance our SCNN by integrating lateral inhibition-based redundancy reduction prior to rank-ordering, which will further improve the classification accuracy by the network.
description: 8 pages, 8 figures, 4 tables. 2020 International Joint Conference on Neural Networks (IJCNN)
Using Differential Geometry to Revisit the Paradoxes of the Instantaneous Frequency
Creators: Federico Milano
Georgios Tzounas
Ioannis Dassios
Mohammed Ahsan Adib Murad
and Taulant K�r�i
Publisher: name: IEEE
Year: 2022

This paper proposes a general framework to interpret the concept of Instantaneous Frequency in three-phase systems.
This paper proposes a general framework to interpret the concept of Instantaneous Frequency (IF) in three-phase systems. The paper first recalls the conventional frequency-domain analysis based on the Fourier transform as well as the definition of IF which is based on the concept of analytic signals. The link between analytic signals and Clarke transform of three-phase voltages of an ac power system is also shown. Then the well-known five paradoxes of the IF are stated. In the second part of the paper, an approach based on a geometric interpretation of the frequency is proposed. This approach serves to revisit the five IF paradoxes and explain them through a common framework. The case study illustrates the features of the proposed framework based on a variety of examples and on a detailed model of the IEEE 39-bus system.
On Satisfying the Android OS Community: User Feedback Still Central to Developers' Portfolios
Creators: name: Licorish, Sherlock A.
name: Tahir, Amjed
name: Bosu, Michael Franklin
name: MacDonell, Stephen G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: End-users play an integral role in identifying requirements, validating software features' usefulness, locating defects, and in software product evolution in general. Their role in these activities is especially prominent in online application distribution platforms (OADPs), where software is developed for many potential users, and for which the traditional processes of requirements gathering and negotiation with a single group of end-users do not apply. With such vast access to end-users, however, comes the challenge of how to prioritize competing requirements in order to satisfy previously unknown user groups, especially with early releases of a product. One highly successful product that has managed to overcome this challenge is the Android Operating System (OS). While the requirements of early versions of the Android OS likely benefited from market research, new features in subsequent releases appear to have benefitted extensively from user reviews. Thus, lessons learned about how Android developers have managed to satisfy the user community over time could usefully inform other software products. We have used data mining and natural language processing (NLP) techniques to investigate the issues that were logged by the Android community, and how Google's remedial efforts correlated with users' requests. We found very strong alignment between end-users' top feature requests and Android developers' responses, particularly for the more recent Android releases. Our findings suggest that effort spent responding to end-users' loudest calls may be integral to software systems' survival, and a product's overall success.
description: Conference paper, 11 pages, 5 figures, 3 tables
In vivo effects of T suppressor molecules : specificity and dose effects
Creators: name: Deal, Heather Elizabeth
Publisher: name: University of British Columbia
Year: 2010

description: The suppressor circuit and it's components have been studied extensively in this laboratory and others for the past ten years. This laboratory has produced factor-secreting hybridoma cells which are analogous to first-order T suppressor cells directed against the tumor P815 . A monoclonal antibody has been raised which recognizes a common portion of suppressor cells and factors. These tools are used in this study. It had been seen that when 20 µg A10F (factor secreted by A10, the Ts1 analogue) was injected into a mouse concurrently with P815, the suppression of the mouse's immune response was boosted. This led to increased tumor growth and accelerated death. However, when A10F was injected ten days prior to the mouse receiving P815, the opposite effect was seen. Mice had smaller tumors and longer survival times. This was not the contrasuppressive effect described by other laboratories, as the effect seen was not merely an abrogation of suppression, but rather enhancement of the immune response. The specificity and dose response of the effect was examined. This immune enhancement effect was not specific within the context of syngeneic tumor systems. It was found that the same effects were seen when P815 was replaced with L1210 or M-1, both also being H-2d tumors. In fact, L1210 was more sensitive to A10F than P815. There was some level of specificity to the enhancement effect. When A10F was replaced with Fd11F, a suppressor factor raised to ferredoxin, no effect was seen. Conversely, A10F did not produce the same effects as Fd11F in the ferredoxin system. Suppressor deletion therapy was used in both of these systems to confirm that suppressor cells were responsible for the effects seen. Dose response studies showed that the enhancement effect was dose dependent. Doses of A10F below 20 µg did not produce enhancement in the P815 system. Enhancement was seen with lower doses of A10F in the L1210 system, but the effect did decrease at the lower doses. A model is proposed for the data presented.
ESM 1-6 from The preservation potential of terrestrial biogeographic patterns
Creators: name: Darroch, Simon A. F.
name: Fraser, Danielle
name: Casey, Michelle M.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: 40308 Palaeontology (incl. Palynology)
subject: FOS: Earth and related environmental sciences

description: Supplementary figures, text, analyses & references
A Spectral-Spatial-Dependent Global Learning Framework for Insufficient and Imbalanced Hyperspectral Image Classification
Creators: name: Zhu, Qiqi
name: Deng, Weihuan
name: Zheng, Zhuo
name: Zhong, Yanfei
name: Guan, Qingfeng
name: Lin, Weihua
name: Zhang, Liangpei
name: Li, Deren
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Deep learning techniques have been widely applied to hyperspectral image (HSI) classification and have achieved great success. However, the deep neural network model has a large parameter space and requires a large number of labeled data. Deep learning methods for HSI classification usually follow a patchwise learning framework. Recently, a fast patch-free global learning (FPGA) architecture was proposed for HSI classification according to global spatial context information. However, FPGA has difficulty extracting the most discriminative features when the sample data is imbalanced. In this paper, a spectral-spatial dependent global learning (SSDGL) framework based on global convolutional long short-term memory (GCL) and global joint attention mechanism (GJAM) is proposed for insufficient and imbalanced HSI classification. In SSDGL, the hierarchically balanced (H-B) sampling strategy and the weighted softmax loss are proposed to address the imbalanced sample problem. To effectively distinguish similar spectral characteristics of land cover types, the GCL module is introduced to extract the long short-term dependency of spectral features. To learn the most discriminative feature representations, the GJAM module is proposed to extract attention areas. The experimental results obtained with three public HSI datasets show that the SSDGL has powerful performance in insufficient and imbalanced sample problems and is superior to other state-of-the-art methods. Code can be obtained at: https://github.com/dengweihuan/SSDGL.
description: 14 pages,14 figures
Hierarchical Trust-Tech-Enhanced K-Means Methods and Their Applications to Power Grids
Creators: Hsiao-Dong Chiang
Tian-Shi Xu
Xian-Long Lv
and Na Dong
Publisher: name: IEEE
Year: 2022

A hierarchical K-means method enhanced by Trust-Tech is presented in this paper.
K-means has been widely used in solving a wide range of clustering problems arising in engineering and industrial applications, but it still suffers from several issues. To address these issues, a hierarchical K-means method enhanced by Trust-Tech (H-KTT) is presented in this paper. The proposed H-KTT method is composed of two stages. The first stage of H-KTT is a hierarchical K-means (H-K-means) method for enhancing K-means with better initial points. Second, the H-K-means method is further enhanced to find multiple high-quality clustering results by the Trust-Tech methodology. The H-KTT method was evaluated on several test datasets including the clustering of Automatic Meter Reading (AMR), popular in power grids, with promising results. In particular, the evaluation results indicate that the proposed H-KTT method can significantly improve both the quality and stability of the clustering results by the K-means method. Furthermore, while the K-means gives stochastic clustering results, the proposed H-KTT method usually gives deterministic clustering results.
Direct diameter measurement of a star filling its Roche Lobe: The semi-detached binary SS Leporis spatially resolved with VINCI/VLTI
Creators: name: Verhoelst, T.
name: van Aarle, E.
name: Acke, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Stellar evolution in close binary systems is strongly influenced by mass transfer from one star to the other when one component fills its zero-velocity surface or Roche Lobe. SS Lep is a fairly nearby close binary showing the Algol paradox and a shell spectrum, both indicative of (past) mass transfer. To study the process of mass transfer and its evolutionary consequences, we aim at a direct characterisation of the spatial dimensions of the different components of SS Lep with IR interferometry. We use VINCI/VLTI interferometric observations in the K band and photometric observations from the UV to the far-IR. The visibilities are interpreted with simple geometrical models and the Spectral Energy Distribution (SED) is decomposed into the three main components: A star, M star and dust shell/disk. From the SED, we find that the main emitters in the K band are the M star and the circumstellar environment. Both are spatially resolved with the VINCI observations, showing the excess to be circumbinary and showing the M star to have a size equal to its Roche Lobe. We conclude that we have, for the first time, directly resolved a star filling its Roche Lobe. The resulting mass transfer is probably the cause of (1) the circumbinary dust disk of which we see the hot inner region spatially resolved in our observations, (2) the unusually high luminosity of the A star and (3) the shell spectrum seen in the UV and optical spectra.
description: 4 pages, 2 figures, accepted for publication in A&A Letters on 26/05/2007
Upper critical field of aligned Na_{x}(H_{3}O)_{z}CoO_{2}\cdot yH_{2}O superconductor by magnetization measurement
Creators: name: Ren, Zhi
name: Feng, Chunmu
name: Xu, Zhu'an
name: Fang, Minghu
name: Cao, Guanghan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present magnetization measurements for the upper critical field $H_{c2}$ on aligned Na$_{x}$(H$_{3}$O)$_{z}$CoO$_{2}\cdot y$H$_{2}$O superconductors with magnetic field parallel to CoO$_2$ layers. The temperature-dependent part of the normal-state magnetization $M(H,T)$ can be well scaled with Brillouin function, suggesting the existence of impurity moments. By subtracting the contribution of the magnetic impurity moments, a well defined onset of superconducting diamagnetism allows the in-field superconducting transition temperature $T_{c}$($H$) accurately determined. No superconducting transition was observed down to 1.9 K under an applied field of 8 Tesla. The result suggests that the $H^{\|ab}_{c2}(0)$ value is just within the Pauli paramagnetic limit, supporting spin-singlet superconductivity in the cobalt oxyhydrate superconductor. Additionally, the upward curvature near $T_{c}$ in the $H^{\|ab}_{c2}-T$ phase diagram was confirmed to be intrinsic. Possible origin of the anomaly was discussed.
description: 4 pages, 4 figures
Çeşitli Redoks Problarının Ekran Baskılı Karbon Elektrodun Elektrokimyasal Davranışı Üzerindeki Etkisinin Dönüşümlü Voltametri Yöntemi ile İncelenmesi
Creators: name: KOÇ, Yücel
name: Uğur MORALI
name: EROL, Salim
name: AVCI, Hüseyin
Publisher: name: Zenodo
Year: 2019
Subjects: Ekran Baskılı Karbon Elektrot, Dönüşümlü Voltametri, Redoks Probu, K₃Fe(CN)₆

description: Son yıllarda, ekran baskılı elektrotların (SPE) düşük maliyet, kullanım kolaylığı, taşınabilirlik ve basit kullanım özellikleri bu elektrotların elektrokimyasal sensör geliştirme süreçlerinde kullanımını giderek arttırmaktadır. SPE’lerin elektrokimyasal davranışlarını aydınlatmak için kullanılan analitik yöntemlerden biri dönüşümlü voltametri (CV) yöntemidir. Bu çalışmada SPE’lerin yaygın olarak kullanılan ekran baskılı karbon elektrodu (SPCE) kullanılarak, farklı derişimlerde (1 mM, 10 mM ve 100 mM) hazırlanan K₃Fe(CN)₆, K₄Fe(CN)₆ ve K₃Fe(CN)₆/ K₄Fe(CN)₆ redoks problarının elektrokimyasal davranışı CV yöntemi ile incelenmiştir. 1 mM derişimindeki K₄Fe(CN)₆ ve K₃Fe(CN)₆/K₄Fe(CN)₆ redoks problarının kullanılmasıyla elde edilen voltamogramlarda anodik pik akımı katodik pik akımına göre daha net olarak gözlemlenebilirken, 10 mM derişimdeki redoks probunun kullanılması durumunda hem anodik hem de katodik pik akımları gözlemlenebilmiştir. Redoks problarının derişiminin 100 mM olduğu durumda ise, K₃Fe(CN)₆’ya kıyasla K₄Fe(CN)₆ ve K₃Fe(CN)₆/K₄Fe(CN)₆’de katodik pik akımı anodik pik akımına göre daha net bir şekilde gözlemlenmiştir. Yapılan bu çalışmada, SPCE’ler kullanılarak gerçekleştirilen CV analizlerinde bu şartlarda 10 mM derişimindeki redoks problarının hem anodik hem katodik pik akımlarının net olarak gözlemlenebilmesi için optimum derişim değeri olduğu saptanmıştır. Böylece, elektrokimyasal sensörlerin indirgenme-yükseltgenme mekanizmalarının incelenmesinde kullanılan redoks problarının derişimlerinin dikkate alınması gereken bir parametre olduğu saptanmıştır.
Der Großbritannien-Bestand der Bibliothek des Bochumer Instituts zur Erforschung der europäischen Arbeiterbewegung
Creators: name: Lederer, Robert
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Der Großbritannien-Bestand der Bibliothek des Bochumer Instituts zur Erforschung der europäischen Arbeiterbewegung" of MTS 11 (1991).
description: Moving the Social, Vol 11 (1991): Arbeiterschaft und Arbeiterbewegung in Großbritannien. Forschungsstand und Perspektiven der Forschung
Distributed Dual Model for High-Frequency Transformer Windings: Electromagnetic Transients and Solid State Transformers
Creators: Digvijay Deswal and Francisco De Le�n
Publisher: name: IEEE
Year: 2022

This paper presents a novel model for transformer windings to accurately represent the duality between electrical and magnetic circuits.
This paper presents a novel model for transformer windings to accurately represent the duality between electrical and magnetic circuits. The model can be used for the calculation of high-frequency transients in power systems and the design of high-frequency transformers, for example, those to be used in solid-state (utility-grade) transformers and power electronic converters. Existing circuit models do not consider the flux linkage in the winding thickness in a physical (dual) way. Duality is achieved by discretizing the winding thickness into thin sub-sections and distributing the proposed model building block across the winding. Analytical calculations are carried out to compare the accuracy of the proposed circuit for the computation of the terminal impedance, flux duality, and current distribution in the physical geometry of the winding. Further discretization is performed to extend the circuit to represent high-frequency phenomena: eddy currents and capacitive effects. The model can be easily implemented in any circuit simulation program using available circuit elements. The circuit parameters are computed with very simple expressions. The model is validated with finite element simulations. Differences of around 1% are obtained for relatively low model orders for high frequencies.
Von der Klassen- zur Rahmen- und Sammelpartei: Die Geschichtsschreibung über die Sozialdemokratische Partei (nach 1918)
Creators: name: Rantala, Marja
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Von der Klassen- zur Rahmen- und Sammelpartei: Die Geschichtsschreibung über die Sozialdemokratische Partei (nach 1918)" of MTS 12 (1992).
description: Moving the Social, Vol 12 (1992): Forschungen zur Arbeiterschaft und Arbeiterbewegung in Finnland
Long Duration Flexibility Planning Challenges and Solutions for Power System With Ultra High Share of Renewable Energy
Creators: Haibo Li
Yisha Lin
Zongxiang Lu
Ying Qiao
Jianru Qin
Chongqing Kang
and Xi Ye
Publisher: name: IEEE
Year: 2022

In this work, the main structural and operating characteristics of the ultra high share of renewable power system are introduced and analyzed.
The uncertainty of wind/photovoltaics (PV) power generation and load fluctuations highlight the urgent need for flexible yet stable power resources. With the increasing in the share of renewable energy, the fluctuation presents a trend toward the longer periods, larger amplitudes, and more drastic changes. Therefore, research on the long duration flexible resources planning for the scenarios of the ultra high share of renewable power system (UHRPS) has become the focus. In this work, the main structural and operating characteristics of UHRPS are introduced and analyzed, which is followed by the flexibility requirements and flexibility planning challenges of UHRPS scenarios. Then, the current research trends in flexibility planning schemes of renewable energy power systems are reviewed. Finally, the key problems and solutions for research on the long duration flexible resources planning of UHRPS are proposed.
Schwerpunktthema: Forschungen zur Arbeiterschaft und Arbeiterbewegung in Finnland
Creators: name: Hentilä, Seppo
name: Hentilä, Marjaliisa
name: Grebing, Helga
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Schwerpunktthema: Forschungen zur Arbeiterschaft und Arbeiterbewegung in Finnland" of MTS 12 (1992).
description: Moving the Social, Vol 12 (1992): Forschungen zur Arbeiterschaft und Arbeiterbewegung in Finnland
Foveal-pit inspired filtering of DVS spike response
Creators: name: Gupta, Shriya T. P.
name: Linares-Serrano, Pablo
name: Bhattacharya, Basabdatta Sen
name: Serrano-Gotarredona, Teresa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences
subject: I.2.10; I.4.5; I.4.10

description: In this paper, we present results of processing Dynamic Vision Sensor (DVS) recordings of visual patterns with a retinal model based on foveal-pit inspired Difference of Gaussian (DoG) filters. A DVS sensor was stimulated with varying number of vertical white and black bars of different spatial frequencies moving horizontally at a constant velocity. The output spikes generated by the DVS sensor were applied as input to a set of DoG filters inspired by the receptive field structure of the primate visual pathway. In particular, these filters mimic the receptive fields of the midget and parasol ganglion cells (spiking neurons of the retina) that sub-serve the photo-receptors of the foveal-pit. The features extracted with the foveal-pit model are used for further classification using a spiking convolutional neural network trained with a backpropagation variant adapted for spiking neural networks.
description: 6 pages, 4 figures, 2 tables. 2021 55th Annual Conference on Information Sciences and Systems (CISS), 2021
Reliable Dispatch of Active Distribution Networks via a Two-Layer Grid-Aware Model Predictive Control: Theory and Experimental Validation
Creators: Rahul Gupta
Antonio Zecchino
Ji-Hyun Yi
and Mario Paolone
Publisher: name: IEEE
Year: 2022

In this work, we propose and experimentally validate a real-time control scheme that achieves a highly-reliable dispatching of active distribution networks and ensures that the battery-energy storage systems' state-of-charge is not saturated during the daily operation.
Dispatching active distribution networks (ADNs) is an energy-intensive application that, if implemented via battery-energy storage systems (BESSs), can require a large capacity of these assets in order to fully balance the uncertainties caused by the stochastic demand and generation. The insufficient capacity of the BESSs often leads to their state-of-charge (SOC) saturation; this results in unreliable dispatch tracking. In this work, we propose and experimentally validate a real-time control scheme that achieves a highly-reliable dispatching of ADNs and ensures that the BESSs' SOC is not saturated during the daily operation. Our proposed scheme uses a two-layer model predictive control (MPC). The upper-layer MPC, running every 5 minutes, optimizes the BESSs' SOC trajectories while minimizing the tracking error, considering the prosumption forecast of the whole day. Then, the lower layer MPC, running every 30 seconds, takes the BESSs' SOC trajectories as constraints while achieving a high-resolution tracking of the dispatch plan over the current 5-minute time horizon. Both layers account for the grid constraints by using the augmented relaxed optimal power-flow (AR-OPF) model; an exact convex relaxation of the original AC-OPF and used in this paper (for the first time in the literature) to solve a real-time constrained control problem for ADNs. Our proposed framework was experimentally validated using a 1.5 MVA/2.5 MWh BESS connected to an actual 24-node medium-voltage (MV) ADN that, in Aigle, Switzerland, hosted an uncontrollable 3.2 MWp distributed photovoltaic generation, 3.4 MVA hydro-power generations, and a 2.8 MW base demand.
Fleet Management and Charging Scheduling for Shared Mobility-on-Demand System: A Systematic Review
Creators: Wenrui Tan
Yimeng Sun
Zhaohao Ding
and Wei-Jen Lee
Publisher: name: IEEE
Year: 2022

In this article, we present the fleet management and charging scheduling of a shared mobility-on-demand system, whereby electric vehicle fleets are operated by a centralized platform to provide customers with mobility service.
Challenged by urbanization and increasing travel needs, existing transportation systems call for new mobility paradigms. In this article, we present the fleet management and charging scheduling of a shared mobility-on-demand system, whereby electric vehicle fleets are operated by a centralized platform to provide customers with mobility service. We provide a comprehensive review of system operation based on the operational objectives. The fleet scheduling strategies are categorized into four types: i) order dispatching, ii) order-dispatching and rebalancing, iii) order-dispatching, rebalancing and charging, and iv) extended. Specifically, we first identify mathematical modeling techniques implemented in the transportation network, then analyze and summarize the solution approaches including mathematical programming, reinforcement learning, and hybrid methods. The advantages and disadvantages of different models and solution approaches are compared. Finally, we present research outlook in various directions.
Editorial: Special Section on Invited Papers in 2022 on Emerging Topics in the Power and Energy Society
Creators: Fangxing "Fran'' Li
Publisher: name: IEEE
Year: 2022

This Special Section of 13 invited papers covers emerging topics including system planning, energy forecasting, integrated energy systems, electric vehicles, flexibility management, control of grid-forming/following inverters, ac/dc hybrid systems, fault location, machine learning application, and transformers.
This Special Section of 13 invited papers covers emerging topics including system planning, energy forecasting, integrated energy systems, electric vehicles, flexibility management, control of grid-forming/following inverters, ac/dc hybrid systems, fault location, machine learning application, and transformers.
Spät 'entdeckt', aber immerhin: Die Arbeiterinnen als Forschungsgegenstand
Creators: name: Lähteenmäki, Maria
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Spät 'entdeckt', aber immerhin: Die Arbeiterinnen als Forschungsgegenstand" of MTS 12 (1992).
description: Moving the Social, Vol 12 (1992): Forschungen zur Arbeiterschaft und Arbeiterbewegung in Finnland
Die Affiliationsrichtlinie der Humboldt-Universität zu Berlin, ein Werkstattbericht
Creators: name: Winterhalter, Christian
Publisher: name: Zenodo
Year: 2021
Subjects: Affiliationsrichtlinie
persistent identifier
publication policy
ORCID iD
ROR

description: Präsentation im Rahmen des ORCID DE - Online-Seminars: Persistent Identifier in Publikations- und Affiliationsrichtlinien an wissenschaftlichen Einrichtungen, 7.12.2021 https://www.orcid-de.org/online-seminar-pids-publikations-und-affiliationsrichtlinien/
Numerical simulations of macrospicule jets under energy imbalance conditions in the solar atmosphere
Creators: name: González-Avilés, J. J.
name: Murawski, K.
name: Srivastava, A. K.
name: Zaqarashvili, T. V.
name: González-Esparza, J. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using numerical simulations, we study the effects of thermal conduction and radiative cooling on the formation and evolution of solar jets with some macrospicules features. We initially assume that the solar atmosphere is rarely in equilibrium through energy imbalance. Therefore, we test whether the background flows resulting from an imbalance between thermal conduction and radiative cooling influence the jets' behavior. In this particular scenario, we trigger the formation of the jets by launching a vertical velocity pulse localized at the upper chromosphere for the following test cases: i) adiabatic case; ii) thermal conduction case; iii) radiative cooling case; iv) thermal conduction + radiative cooling case. According to the test results, the addition of the thermal conduction results in smaller and hotter jets than in the adiabatic case. On the other hand, the radiative cooling dissipates the jet after reaching the maximum height ($\approx$ 5.5 Mm), making it shorter and colder than in the adiabatic and thermal conduction cases. Besides, the flow generated by the radiative cooling is more substantial than the caused by thermal conduction. Despite the energy imbalance of the solar atmosphere background, the simulated jet shows morphological features of macrospicules. Furthermore, the velocity pulse steepens into a shock that propagates upward into a solar corona that maintains its initial temperature. The shocks generate the jets with a quasi-periodical behavior that follows a parabolic path on time-distance plots consistent with macrospicule jets' observed dynamics.
description: 15 pages, 12 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society
A Plane-Symmetric Inhomogeneous Cosmological Model of Perfect Fluid Distribution with Electromagnetic Field I
Creators: name: Pradhan, Anirudh
name: Singh, P. K.
name: Yadav, A. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A plane-symmetric inhomogeneous cosmological model of perfect fluid distribution with electro-magnetic field is obtained. The source of the magnetic field is due to an electric current produced along the z-axis. $F_{12}$ is the non-vanishing component of electromagnetic field tensor. To get a deterministic solution, we assume the free gravitational field is Petrov type-II non-degenerate. The behaviour of the electro-magnetic field tensor together with some physical aspects of the model are also discussed.
description: 11 pages, no figure
Supplementary Information from Maximum CO2 diffusion inside leaves is limited by the scaling of cell size and genome size
Creators: name: Théroux-Rancourt, Guillaume
name: Roddy, Adam B.
name: J. Mason Earles
name: Gilbert, Matthew E.
name: Zwieniecki, Maciej A.
name: C. Kevin Boyce
name: Tholen, Danny
name: McElrone, Andrew J.
name: Simonin, Kevin A.
name: Brodersen, Craig R.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Environmental Science
subject: Plant Biology

description: Figures S1 to S14, Supplementary Table S5, and Supplementary Methods and Results
Additional file 2 of GBC: a parallel toolkit based on highly addressable byte-encoding blocks for extremely large-scale genotypes of species
Creators: name: Zhang, Liubin
name: Yuan, Yangyang
name: Peng, Wenjie
name: Tang, Bin
name: Li, Mulin Jun
name: Gui, Hongsheng
name: Wang, Qiang
name: Li, Miaoxin
Publisher: name: figshare
Year: 2023
Subjects: subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences

description: Additional file 2: Fig. S1. Using CLM algorithm to achieve ordered output during parallel computation of large-scale data. Fig. S2. Optimized file management (sorting and merging) based on GTB.
February - The Past, Present & Future of Hydrogen in Electrical Grids - Part 1
Creators: Binesh Asok Kumar
Abhishek Joshi
Soheil Mohseni
Alan Brent
Moshen Khorasany
Chung Fong
Mazheruddin Syed
Iain Fleming
Graeme Burt
Efstathios (Stathis) Tapinos
Pavlina Van Rooyenova
Kirsty Webster
Jon Matthews
Publisher: name: IEEE
Year: 2023

Bulletin
An issue of the Smart Grid Bulletin featuring "Batteries Comparing to Hydrogen Fuel Cells", "The Role of Green Hydrogen in Driving the Deployment of Integrated Sustainable Energy Systems", "How Emerging Technologies Can Accelerate the Uptake of Green Hydrogen", and "Airport Infrastructure Readiness to Power Zero Emissions Flight"
Aid to Percutaneous Renal Access by Virtual Projection of the Ultrasound Puncture Tract onto Fluoroscopic Images
Creators: name: Mozer, Pierre
name: Conort, Pierre
name: Leroy, Antoine
name: Baumann, Michael
name: Payan, Yohan
name: Troccaz, Jocelyne
name: Chartier-Kastler, Emmanuel
name: Richard, François
Publisher: name: arXiv
Year: 2007
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Background and Purpose: Percutaneous renal access in the context of percutaneous nephrolithotomy (PCNL) is a difficult technique, requiring rapid and precise access to a particular calix. We present a computerized system designed to improve percutaneous renal access by projecting the ultrasound puncture tract onto fluoroscopic images. Materials and Methods: The system consists of a computer and a localizer allowing spatial localization of the position of the various instruments. Without any human intervention, the ultrasound nephrostomy tract is superimposed in real time onto fluoroscopic images acquired in various views. Results: We tested our approach by laboratory experiments on a phantom. Also, after approval by our institution's Ethics Committee, we validated this technique in the operating room during PCNL in one patient. Conclusion: Our system is reliable, and the absence of image-processing procedures makes it robust. We have initiated a prospective study to validate this technique both for PCNL specialists and as a learning tool.
Wozu noch Arbeitergeschichte?
Creators: name: Hentilä, Seppo
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Wozu noch Arbeitergeschichte?" of MTS 12 (1992).
description: Moving the Social, Vol 12 (1992): Forschungen zur Arbeiterschaft und Arbeiterbewegung in Finnland
The origin and evolution of magnetic white dwarfs in close binary stars
Creators: name: Schreiber, Matthias R.
name: Belloni, Diogo
name: Gaensicke, Boris T.
name: Parsons, Steven G.
name: Zorotovic, Monica
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The origin of magnetic fields in white dwarfs remains a fundamental unresolved problem in stellar astrophysics. In particular, the very different fractions of strongly (exceeding 1 MG) magnetic white dwarfs in evolutionarily linked populations of close white dwarf binary stars cannot be reproduced by any scenario suggested so far. Strongly magnetic white dwarfs are absent among detached white dwarf binary stars that are younger than approximately 1 Gyr. In contrast, in semi-detached cataclysmic variables in which the white dwarf accretes from a low-mass star companion, more than one third host a strongly magnetic white dwarf. Here we present binary star evolutionary models that include the spin evolution of accreting white dwarfs and crystallization of their cores, as well as magnetic field interactions between both stars. We show that a crystallization- and rotation-driven dynamo similar to those working in planets and low-mass stars can generate strong magnetic fields in the white dwarfs in cataclysmic variables which explains their large fraction among the observed population. When the magnetic field generated in the white dwarfs connects with that of the secondary stars, synchronization torques and reduced angular momentum loss cause the binary to detach for a relatively short period of time. The few known strongly magnetic white dwarfs in detached binaries, including AR Sco, are in this detached phase.
Ultralow-frequency broadband characteristics of stepwise radial metamaterials
Creators: name: Jia
Publisher: name: figshare
Year: 2021
Subjects: subject: Applied Physics
subject: 91304 Dynamics, Vibration and Vibration Control
subject: FOS: Mechanical engineering

description: A new type of stepwise radial metamaterial (SRM) with ultralow-frequency and broadband characteristics is proposed in this study. In contrast to the traditional radial metamaterial (TRM), the proposed structure is periodically arranged in a stepwise shape along the radial direction. The propagation characteristics of Lamb waves in the SRM were investigated using the finite element method. For the numerical analysis, the degeneracy between the bands of the SRM was separated, resulting in the opening of the bandgaps in the ultralow-frequency range. The total bandwidth was 75 times that of the TRM, and the wave attenuation ability was increased by more than 70%. The introduction of a stepwise array in the SRM opened up the local resonance and Bragg scattering bandgaps, and as a result, the SRM exhibited ultralow-frequency broadband characteristics. Furthermore, the influences of the structural parameters of the SRM on the bandgap characteristics were discussed. With the increase in the stepped angle, the coupling relationship between the Lamb wave mode and the local resonance was enhanced, which caused the band structure to shift to a lower frequency. In addition, the hole rotation and shape played important roles in the bandgap tuning. Finally, the experimental sample was processed based on the model, and the vibration propagation characteristics were tested to prove its ultralow-frequency broadband characteristics. The proposed shielding approach could provide a better alternative in the field of ultralow-frequency noise reduction and vibration reduction.
Lipophilization of beta-lactoglobulin : effect on hydrophobicity, surface functional properties, digestibility and allergenicity
Creators: name: Akita, Emmanuel E.
Publisher: name: University of British Columbia
Year: 2010

description: In this research, beta-lactoglobulin was chemically modified by attaching different levels of stearic acid to the protein. The effect of this modification on hydrophobic!ty, emulsifying and foam properties, digestibility and allergenicity of the protein was investigated. It was found that the effect of fatty acid attachment or lipophilization depended on the amount of fatty acids attached to the protein. Incorporation of the hydrophobic ligands led to increased hydrophobic interactions, resulting in a decreasing solubility with extent of incorporation. Furthermore, the surface hydrophobicity measurements showed that the two fluorescence probes 8-anilinonaphthalene-l-sulfonate (ANS) and cis-parinaric acid (CPA) used for the surface hydrophobicity measurements were not equivalent This may support the. observation by earlier workers that ANS measures aromatic hydrophobicity and CPA aliphatic hydrophobicity. The studies on surface functional properties i.e. emulsifying and foaming properties, indicated that there was some improvement in these functional properties at low and medium levels of incorporation which decreased as the extent of fatty acid attachment further increased. The improvement, of these functional properties could be attributed to improved amphiphilicity of the proteins at these levels of incorporation. This research also showed that both high solubility and high ANS surface hydrophobicity is needed for the best emulsifying properties. In vitro digestibility studies showed a decrease in digestibility of the modified proteins with increased lipophilization. From the passive cutaneous anaphylaxis experiments, it was found that the level of fatty acid attachment to the protein had a significant effect on its ability to elicit IgE antibodies. Increased ability to elicit IgE antibodies was observed at a low level of fatty acid. When a medium level of fatty acid was attached the ability to elicit antibodies was reduced and almost completely destroyed when a higher level of fatty acid was incorporated. The above observations could be explained by the fact that the low level incorporation of fatty acid led to changes in the protein structure which exposed more allergenic sites. The almost complete destruction of the allergenicity could be attributed to denaturation of the protein which reduced or destroyed available allergenic sites. The antigenicity or binding of the modified proteins to the IgG antibodies raised against the native protein was studied by both direct and competitive enzyme linked immunosorbent assay. It was found that at low and medium levels of incorporation, the proteins demonstrated increased binding ability compared to the native protein. This was attributed to the increased exposure of antigenic sites on the protein with fatty acid incorporation. However, the protein with high level of incorporated fatty acid showed decreased binding ability.
Entanglement in the 1D extended anisotropic Heisenberg model
Creators: name: Plekhanov, E.
name: Avella, A.
name: Mancini, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a study of entanglement in the case of the 1D extended anisotropic Heisenberg model. We investigate two quantum phase transitions (QPTs) within the previously found ergodicity phase diagram [E. Plekhanov, A. Avella, and F. Mancini Phys. Rev. B \textbf{74}, 115120 (2006)]. Our calculations are done by means of the numerically exact Lanczos method at T=0, followed by a finite-size scaling. As a measure of entanglement we use the concurrence for two spins out of the system. We conclude from our studies that these QPTs are accompanied by a qualitative entanglement change.
description: 2 pages, 3 figures, presented at SCES'07 Houston, May 2007