cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
3D point cloud segmentation using GIS
Creators: name: Liu, Chao-Jung
name: Krylov, Vladimir
name: Dahyot, Rozenn
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this paper we propose an approach to perform semantic segmentation of 3D point cloud data by importing the geographic information from a 2D GIS layer (OpenStreetMap). The proposed automatic procedure identifies meaningful units such as buildings and adjusts their locations to achieve best fit between the GIS polygonal perimeters and the point cloud. Our processing pipeline is presented and illustrated by segmenting point cloud data of Trinity College Dublin (Ireland) campus constructed from optical imagery collected by a drone.
description: 8 pages
Classes of 3-regular graphs that are (7, 2)-edge-choosable
Creators: name: Cranston, Daniel W.
name: West, Douglas B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05D99

description: A graph is (7, 2)-edge-choosable if, for every assignment of lists of size 7 to the edges, it is possible to choose two colors for each edge from its list so that no color is chosen for two incident edges. We show that every 3-edge-colorable graph is (7, 2)-edge-choosable and also that many non-3-edge-colorable 3-regular graphs are (7, 2)-edge-choosable.
description: 12 pages, 1 figure
Rotation Curves of Galaxies and Their Dependence on Morphology and Stellar Mass
Creators: name: Yoon, Yongmin
name: Park, Changbom
name: Chung, Haeun
name: Zhang, Kai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study how stellar rotation curves (RCs) of galaxies are correlated on average with morphology and stellar mass ($M_\mathrm{star}$) using the final release of Sloan Digital Sky Survey IV MaNGA data. We use the visually assigned $T$-types for the morphology indicator, and adopt a functional form for the RC that can model non-flat RCs at large radii. We discover that within the radial coverage of the MaNGA data, the popularly known flat rotation curve at large radii applies only to the particular classes of galaxies, i.e., massive late types ($T$-type $\geq1$, $M_\mathrm{star}\gtrsim10^{10.8}M_\odot$) and S0 types ($T$-type$=-1$ or $0$, $M_\mathrm{star}\gtrsim10^{10.0}M_\odot$). The RC of late-type galaxies at large radii rises more steeply as $M_\mathrm{star}$ decreases, and its slope increases to about $+9$ km s$^{-1}$kpc$^{-1}$ at $M_\mathrm{star}\approx10^{9.7}M_\odot$. By contrast, elliptical galaxies ($T$-type $\le-2$) have descending RCs at large radii. Their slope becomes more negative as $M_\mathrm{star}$ decreases, and reaches as negative as $-15$ km s$^{-1}$kpc$^{-1}$ at $M_\mathrm{star}\approx10^{10.2}M_\odot$. We also find that the inner slope of the RC is highest for elliptical galaxies with $M_\mathrm{star}\approx10^{10.5}M_\odot$, and decreases as $T$-type increases or $M_\mathrm{star}$ changes away from $10^{10.5}M_\odot$. The velocity at the turnover radius $R_t$ is higher for higher $M_\mathrm{star}$, and $R_t$ is larger for higher $M_\mathrm{star}$ and later $T$-types. We show that the inner slope of the RC is coupled with the central surface stellar mass density, which implies that the gravitational potential of central regions of galaxies is dominated by baryonic matter. With the aid of simple models for matter distribution, we discuss what determines the shapes of RCs.
description: 18 pages, 15 figures, 1 table, accepted for publication in the ApJ
title: Descemet Membrane Endothelial Keratoplasty (DMEK) Reduces the Corneal Epithelial Thickness in Fuchs' Patients
Creators: name: Storp, Jens Julian
name: Lahme, Larissa
name: Al-Nawaiseh, Sami
name: Eter, Nicole
name: Alnawaiseh, Maged
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2023
Subjects: subject: 610 Medicine and health

description: Fuchs' endothelial corneal dystrophy (FECD) is the occurrence of corneal edema due to endothelial cell dystrophy. Descemet membrane endothelial keratoplasty (DMEK) is considered to be the gold standard of treatment. The aim of this study was to investigate the changes in the corneal epithelial thickness of FECD patients before and after DMEK and to compare these results with a healthy control cohort. In this retrospective analysis, 38 eyes of patients with FECD that were treated with DMEK and 35 healthy control eyes received anterior segment optical coherence tomography (OCT; Optovue, XR-Avanti, Fremont, CA, USA). The corneal epithelial thicknesses in different locations were analyzed and compared between the preoperative, postoperative, and control cohorts. The median follow-up time was 9 months. There was a significant degression of the mean epithelial thickness after DMEK in the central, paracentral, and mid-peripheral zones (p < 0.01) of the cornea. The total corneal thickness and stromal thickness decreased significantly as well. No significant differences were observed between the postoperative and control cohorts. In conclusion, the FECD patients had an increased epithelial thickness compared to the healthy controls, which decreased significantly after DMEK and reached thickness levels comparable to those of healthy control eyes. This study emphasized the importance of distinguishing between the corneal layers in anterior segment pathologies and surgical procedures. Moreover, it accentuated the fact that the structural alterations in FECD extend beyond the corneal stroma.
description: Finanziert durch den Open-Access-Publikationsfonds der Universität Münster.
Canadian Gallup Poll # 904-1
Creators: name: Inc., The Canadian Gallup Poll
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Federal election vote intent(1); past federal elections vote(1); compulsory military training(3); Salman Rushdie's Satanic Verses(2); planned purchases(8); Canadian rail service(4); economic and business conditions(3); trust and confidence in various companies(8); cost of products and services(6); corporate mergers(5); privatization of state-run companies(10); hunger in Canada(8).
Clinton Academy, 151 Main Street
Creators: name: Weber, Harvey A.
Publisher: name: Unknown
Year: 1970
Subjects: Photographs
Photos
Historic buildings
East Hampton
Structures
Dwellings
Clinton Academy
Main Street

description: This images shows a sidewalk view of Clinton Academy located at 151 Main Street in East Hampton. This image was taken by photographer Harvey A. Weber (1917-1991) and is part of the East Hampton’s Heritage Photo Collection.
description: Images within East Hampton Heritage Photo Collection seem to have been taken or collected in relation to the East Hampton Heritage project, but not all of them were included in the final publication. Several photographer are included in this collection.
Accelerating Approximate Aggregation Queries with Expensive Predicates
Creators: name: Kang, Daniel
name: Guibas, John
name: Bailis, Peter
name: Hashimoto, Tatsunori
name: Sun, Yi
name: Zaharia, Matei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Researchers and industry analysts are increasingly interested in computing aggregation queries over large, unstructured datasets with selective predicates that are computed using expensive deep neural networks (DNNs). As these DNNs are expensive and because many applications can tolerate approximate answers, analysts are interested in accelerating these queries via approximations. Unfortunately, standard approximate query processing techniques to accelerate such queries are not applicable because they assume the result of the predicates are available ahead of time. Furthermore, recent work using cheap approximations (i.e., proxies) do not support aggregation queries with predicates. To accelerate aggregation queries with expensive predicates, we develop and analyze a query processing algorithm that leverages proxies (ABae). ABae must account for the key challenge that it may sample records that do not satisfy the predicate. To address this challenge, we first use the proxy to group records into strata so that records satisfying the predicate are ideally grouped into few strata. Given these strata, ABae uses pilot sampling and plugin estimates to sample according to the optimal allocation. We show that ABae converges at an optimal rate in a novel analysis of stratified sampling with draws that may not satisfy the predicate. We further show that ABae outperforms on baselines on six real-world datasets, reducing labeling costs by up to 2.3x.
Effect of lactic acid administration on rumen myoelectrical activity and pressure changes in the sheep
Creators: name: Smith, Craig Michael
Publisher: name: University of British Columbia
Year: 2010

description: Pressure changes and myoelectrical activity in the ovine rumen were investigated following the surgical implantation of fluid filled balloon-tipped tygon tubes and paired fine needle platinum electrodes. The correlations among rumen pressure change and myoelectrical spike burst duration, frequency and magnitude data from 447 7 one minute periods were determined in order to select a single reliable quantitative measurement of rumen motility. The results showed that all these parameters accurately reflect activity changes in the rumen. Myoelectrical spike burst duration was shown to be the most sensitive indicator and was used as the criterion for examination of lactic acid induced motility changes. Rumen motility was not affected by intraruminal introduction of 1000 ml of 0.15 or 0.7 M lactic acid at pH 2.0 via permanently implanted cannulae. Intravenous infusion of 2 concentrations of sodium lactate which increased blood lactate levels by approximately 20 mg% and 180 mg% respectively, also had no effect on rumen motility. Infusion of lactic acid solutions (250 ml) 0.15 or 0.7 M (pH 2.0, 4.0 and 6.0) intraduodenally via polyethylene cannulae exerted profound effects on rumen motility. Immediately following ( 1 min) the commencement of the infusion of lactic acid (pH 2.0), a short period of total inhibition of motility occurred which was followed by a rapid recovery of motility to near normal levels despite the continuation of the infusion. These initial short periods of inhibition and recovery continued for up to one hour following termination of infusion. Similar yet somewhat reduced responses were observed upon intraduodenal infusion of the lactic acid solutions at pH 4.0 and 6.0. These results suggest that inhibition of rumen motility in lactic acidosis may be caused primarily by lactic acid produced in the rumen entering the intestine and causing a stimulation of the enterogastric reflexes.
In-filter Computing For Designing Ultra-light Acoustic Pattern Recognizers
Creators: name: Nair, Abhishek Ramdas
name: Chakrabartty, Shantanu
name: Thakur, Chetan Singh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Sound (cs.SD)
subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We present a novel in-filter computing framework that can be used for designing ultra-light acoustic classifiers for use in smart internet-of-things (IoTs). Unlike a conventional acoustic pattern recognizer, where the feature extraction and classification are designed independently, the proposed architecture integrates the convolution and nonlinear filtering operations directly into the kernels of a Support Vector Machine (SVM). The result of this integration is a template-based SVM whose memory and computational footprint (training and inference) is light enough to be implemented on an FPGA-based IoT platform. While the proposed in-filter computing framework is general enough, in this paper, we demonstrate this concept using a Cascade of Asymmetric Resonator with Inner Hair Cells (CAR-IHC) based acoustic feature extraction algorithm. The complete system has been optimized using time-multiplexing and parallel-pipeline techniques for a Xilinx Spartan 7 series Field Programmable Gate Array (FPGA). We show that the system can achieve robust classification performance on benchmark sound recognition tasks using only ~ 1.5k Look-Up Tables (LUTs) and ~ 2.8k Flip-Flops (FFs), a significant improvement over other approaches.
description: in IEEE Internet of Things Journal
Teleportation-based noiseless quantum amplification of coherent states of light
Creators: name: Fiurášek, Jaromír
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose and theoretically analyze a teleportation-based scheme for high-fidelity noiseless quantum amplification of coherent states of light. In our approach, the probabilistic noiseless quantum amplification operation is encoded into a suitable auxiliary two-mode entangled state and then applied to the input coherent state via continuous-variable quantum teleportation. The scheme requires conditioning on the outcomes of homodyne measurements in the teleportation protocol. In contrast to high-fidelity noiseless quantum amplifiers based on combination of conditional single-photon addition and subtraction, the present scheme requires only photon subtraction in combination with auxiliary Gaussian squeezed vacuum states. We first provide a pure-state description of the protocol which allows us to to clearly explain its principles and functioning. Next we develop a more comprehensive model based on phase-space representation of quantum states, that accounts for various experimental imperfections such as excess noise in the auxiliary squeezed states or limited efficiency of the single-photon detectors that can only distinguish the presence or absence of photons. We present and analyze predictions of this phase-space model of the noiseless tele-amplifier.
description: 18 pages, 6 figures
Additional file 1 of Prevalence of anemia and iron deficiency anemia in Chinese pregnant women (IRON WOMEN): a national cross-sectional survey
Creators: name: Tan, Jing
name: He, Guolin
name: Qi, Yana
name: Yang, Hongmei
name: Xiong, Yiquan
name: Liu, Chunrong
name: Wang, Wen
name: Zou, Kang
name: Lee, Andy H.
name: Sun, Xin
name: Liu, Xinghui
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1 Figure S1 The distribution of six regions and selected cities among China. Figure S2 The flow chart of included population. Figure S3 Median and 95% confidence intervals for prevalence of previously diagnosed IDA categorized by gestational month. Table S1 List of 24 selected hospitals in our study and the number of included pregnant women. Table S2 Survey on iron deficiency among pregnant women in China (Pregnant Women Investigation). Table S3 Survey on iron deficiency among pregnant women in China (Doctor Investigation)
Earth's accretion inferred from iron isotopic anomalies of supernova nuclear statistical equilibrium origin
Creators: name: Hopp, Timo
name: Dauphas, Nicolas
name: Spitzer, Fridolin
name: Burkhardt, Christoph
name: Kleine, Thorsten
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Nucleosynthetic Fe isotopic anomalies in meteorites may be used to reconstruct the early dynamical evolution of the solar system and to identify the origin and nature of the material that built planets. Using high-precision iron isotopic data of 23 iron meteorites from nine major chemical groups we show that all iron meteorites show the same fundamental dichotomy between non-carbonaceous (NC) and a carbonaceous (CC) meteorites previously observed for other elements. The Fe isotopic anomalies are predominantly produced by variation in 54Fe, where all CC iron meteorites are characterized by an excess in 54Fe relative to NC iron meteorites. This excess in 54Fe is accompanied by an excess in 58Ni observed in the same CC meteorite groups. Together, these overabundances of 54Fe and 58Ni are produced by nuclear statistical equilibrium either in type Ia supernovae or in the Si/S shell of core-collapse supernovae. The new Fe isotopic data reveal that Earth's mantle plots on or close to correlations defined by Fe, Mo, and Ru isotopic anomalies in iron meteorites, indicating that throughout Earth's accretion, the isotopic composition of its building blocks did not drastically change. While Earth's mantle has a similar Fe isotopic composition to CI chondrites, the latter are clearly distinct from Earth's mantle for other elements (e.g., Cr and Ni) whose delivery to Earth coincided with Fe. The fact that CI chondrites exhibit large Cr and Ni isotopic anomalies relative to Earth's mantle, therefore, demonstrates that CI chondrites are unlikely to have contributed significant Fe to Earth.
description: 1 Table, 9 Figures
Additional file 1 of Enhanced antitumor effects of follicle-stimulating hormone receptor-mediated hexokinase-2 depletion on ovarian cancer mediated by a shift in glucose metabolism
Creators: name: Zhang, Meng
name: Liu, Qiyu
name: Zhang, Mingxing
name: Cao, Cong
name: Liu, Xiaoxia
name: Zhang, Mengyu
name: Li, Guiling
name: Xu, Congjian
name: Zhang, Xiaoyan
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Astronomical and Space Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer

description: Additional file 1: Table S1. DLS size and zeta potential of nanoparticles with different N/P ratios. Figure S1. Relative FSHR mRNA expression in human normal tissues ( https://gtexportal.org/home/gene/FSHR ). Figure S2. FTIR of FSH (A), DFSH (B), PEG (C), PEI (D), FSH-PEG (E) and DFSH-PEG (F). Figure S3. In vitro effects of HK2 shRNA-loaded nanoparticles on different cancer cell lines. (A) Cell viability according to a CCK-8 assay. (B) Cell apoptosis according to flow cytometry. Figure S4. In vitro effects of scramble shRNA-loaded nanoparticles on A2780 and A2780CP cells. A2780 and A2780CP cells were treated with scramble shRNA-loaded nanoparticles at a plasmid-equivalent concentration of 1.0 μg/ml. (A) Cell viability according to a CCK-8 assay. (B) Cell apoptosis according to flow cytometry.
Newton, entanglement, and the graviton
Creators: name: Carney, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Many experiments have recently been proposed to test whether non-relativistic gravitational interactions can generate entanglement. In this note, I consider the extent to which these experiments can test if the graviton exists. Assuming unitarity and Lorentz invariance of the $S$-matrix, I demonstrate that this "Newtonian entanglement" requires the existence of massless bosons, universally coupled to mass, in the Hilbert space of low-energy scattering states. These bosons could be the usual spin-2 gravitons, but in principle there are other possibilities like spin-0 scalar gravitons. I suggest a concept for a more refined experiment to rule these out. The special role of $d=3+1$ spacetime dimensions and the possibility that unitarity is violated by gravity are highlighted.
description: 11 pages + appendices. Dedicated to the memory of Steve Weinberg
Towards a Computational Framework for Automated Discovery and Modeling of Biological Rhythms from Wearable Data Streams
Creators: name: Yan, Runze
name: Doryab, Afsaneh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Modeling biological rhythms helps understand the complex principles behind the physical and psychological abnormalities of human bodies, to plan life schedules, and avoid persisting fatigue and mood and sleep alterations due to the desynchronization of those rhythms. The first step in modeling biological rhythms is to identify their characteristics, such as cyclic periods, phase, and amplitude. However, human rhythms are susceptible to external events, which cause irregular fluctuations in waveforms and affect the characterization of each rhythm. In this paper, we present our exploratory work towards developing a computational framework for automated discovery and modeling of human rhythms. We first identify cyclic periods in time series data using three different methods and test their performance on both synthetic data and real fine-grained biological data. We observe consistent periods are detected by all three methods. We then model inner cycles within each period through identifying change points to observe fluctuations in biological data that may inform the impact of external events on human rhythms. The results provide initial insights into the design of a computational framework for discovering and modeling human rhythms.
description: 18 pages, 12 figures, 4 tables
The Haida raven : a zoological and symbolic interpretation
Creators: name: Von Hopffgarten, Daphne
Publisher: name: University of British Columbia
Year: 2010

description: This study is about the Haida raven. It is both a zoological and symbolic study: of the raven bird (Corvus corax principalis) which is an ubiquitous natural presence throughout the Queen Charlotte Islands, and also of the personified Raven, the trickster transformer character Nañkî'lsLas. Thus, the study looks at the natural attributes of the bird, and the ethnographic literature, with references to the myths, and most specifically, at the material representations' abstractions of the attributes of the raven. As a result of this correlation, it becomes clear that these different dimensions of expressions of the Raven/raven interrelate in such a way as to support a wider and more comprehensive understanding of this complex figure of the Haida culture. In conclusion, the raven is discussed as a primary symbolic animal of the Haida culture, who is perhaps, in a metaphorical sense, a reflection of man's conception of his own self in the universe; who is, Raven/raven, the 'one who makes things happen by his word'.
Quantifying and Improving Performance of Distributed Deep Learning with Cloud Storage
Creators: name: Krichevsky, Nicholas
name: Louis, Renee St
name: Guo, Tian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Cloud computing provides a powerful yet low-cost environment for distributed deep learning workloads. However, training complex deep learning models often requires accessing large amounts of data, which can easily exceed the capacity of local disks. Prior research often overlooks this training data problem by implicitly assuming that data is available locally or via low latency network-based data storage. Such implicit assumptions often do not hold in a cloud-based training environment, where deep learning practitioners create and tear down dedicated GPU clusters on demand, or do not have the luxury of local storage, such as in serverless workloads. In this work, we investigate the performance of distributed training that leverages training data residing entirely inside cloud storage buckets. These buckets promise low storage costs, but come with inherent bandwidth limitations that make them seem unsuitable for an efficient training solution. To account for these bandwidth limitations, we propose the use of two classical techniques, namely caching and pre-fetching, to mitigate the training performance degradation. We implement a prototype, DELI, based on the popular deep learning framework PyTorch by building on its data loading abstractions. We then evaluate the training performance of two deep learning workloads using Google Cloud's NVIDIA K80 GPU servers and show that we can reduce the time that the training loop is waiting for data by 85.6%-93.5% compared to loading directly from a storage bucket - thus achieving comparable performance to loading data directly from disk - while only storing a fraction of the data locally at a time. In addition, DELI has the potential of lowering the cost of running a training workload, especially on models with long per-epoch training times.
description: To appear in IC2E 2021
Additional file 3 of Prevalence of sarcopenia in Chinese community-dwelling elderly: a systematic review
Creators: name: Ren, Xiaoyu
name: Zhang, Xianliang
name: He, Qiang
name: Du, Litao
name: Chen, Ke
name: Chen, Si
name: Pan, Yang
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: Additional file 3: Figure S2. The prevalence of sarcopenia in males by age group.
Deep Generative Models to Extend Active Directory Graphs with Honeypot Users
Creators: name: Lukas, Ondrej
name: Garcia, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Active Directory (AD) is a crucial element of large organizations, given its central role in managing access to resources. Since AD is used by all users in the organization, it is hard to detect attackers. We propose to generate and place fake users (honeyusers) in AD structures to help detect attacks. However, not any honeyuser will attract attackers. Our method generates honeyusers with a Variational Autoencoder that enriches the AD structure with well-positioned honeyusers. It first learns the embeddings of the original nodes and edges in the AD, then it uses a modified Bidirectional DAG-RNN to encode the parameters of the probability distribution of the latent space of node representations. Finally, it samples nodes from this distribution and uses an MLP to decide where the nodes are connected. The model was evaluated by the similarity of the generated AD with the original, by the positions of the new nodes, by the similarity with GraphRNN and finally by making real intruders attack the generated AD structure to see if they select the honeyusers. Results show that our machine learning model is good enough to generate well-placed honeyusers for existing AD structures so that intruders are lured into them.
description: 2nd International Conference on Deep Learning Theory and Applications - DeLTA2021
Consequences of space-time invariances in quantum mechanics and direct interaction theories
Creators: name: Kalyniak, Patricia Ann
Publisher: name: University of British Columbia
Year: 2010

description: The problem of describing a quantum mechanical system is considered. For a system which is invariant under the Poincaré (inhomogeneous Lorentz) transformations this description is provided by the generators of those transformations, which satisfy the usual commutation relations. General expressions for the centre of mass position and internal angular momentum operators, in terms of these generators, are obtained. The generators of the Poincaré transformations are written in terms of the fundamental dynamical variables for several systems. The systems considered are those consisting of a single free spinless particle, a single free particle with spin, a single free Dirac particle, n noninteracting particles, and ft interacting particles. In each case, the centre of mass position and internal angular momentum are given in terms of the fundamental dynamical variables of the system. For the first two systems listed above, these two operators are found to be equal to the Cartesian coordinates and spin of the particle, respectively. In the case of the Dirac particle, these operators are seen to be related to the Cartesian coordinates and spin of the particle via the Pryce-Foldy-Wouthuysen transformation. Following Bakamjian and Thomas, interaction is introduced to the n particle system via a single operator which depends only on internal variables. The condition of "asymptotic covariance" of the scattering operator is discussed for two particle scattering. The scattering operator for a two particle system with no bound states and with Poincaré generators of the Bakamjian-Thomas form is seen to be asymptotically covariant.
Macdonald operators and homological invariants of the colored Hopf link
Creators: name: Awata, Hidetoshi
name: Kanno, Hiroaki
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 05A30, 33D52, 57M27, 81T45

description: Using a power sum (boson) realization for the Macdonald operators, we investigate the Gukov, Iqbal, Kozcaz and Vafa (GIKV) proposal for the homological invariants of the colored Hopf link, which include Khovanov-Rozansky homology as a special case. We prove the polynomiality of the invariants obtained by GIKV's proposal for arbitrary representations. We derive a closed formula of the invariants of the colored Hopf link for antisymmetric representations. We argue that a little amendment of GIKV's proposal is required to make all the coefficients of the polynomial non-negative integers.
description: 31 pages. Published version with an additional appendix
The tunnel bus in Hong Kong: an analysis of user preferences for a public transportation system
Creators: name: Ko, Tin-Ming
Publisher: name: University of British Columbia
Year: 2010

description: The importance of consumer preference in transportation as a key to the forecasting of modal choice has received a growing recognition in the last ten years among transportation researchers in North America. Numerous studies of consumer attitudes toward transportation systems have been conducted in order to disclose the motivation underlying transportation consumer behavior. In Hong Kong the situation is different. In the last decade, several city-wide transportation studies have been conducted, with detailed description of aggregate travel characteristics such as trip purpose, income, and origin-destination. Yet, relatively little is known about consumer values relevant to transportation mode selection decisions. There is a scarcity of information concerning the factors that affect consumer behavior in transport, and the relative importance of these factors. The need for research designed to find information which will help fill this void of information is substantial. The objective of this thesis is to analyze, by means of an interview survey, the travelling behavior of the Tunnel-Bus passengers, and thereby to establish the relative importance of the different factors which lead to their mode selection decision. Two pieces of analysis have been undertaken. First, an analysis of the personal, socio-economic and trip characteristics of the passengers is performed. Secondly, an analysis of the passengers' mode-choice decision is made. The passengers' mode-choice decision is related to their personal, socio-economic and trip characteristics. In the light of the findings of these two steps, an appraisal of the predictions of patronage made by the government before the Tunnel Bus was introduced is undertaken. It is found that convenience and time-saving are the most important determinants that cause the passengers to use the Tunnel Bus. People are generally willing to pay more for a better, faster, more convenient transport mode for their cross-harbor journeys. Their grounds for choice of mode, however, vary with different groups of personal, socio-economic and trip characteristics such as, personal income, sex, trip purpose, frequency of use and previous transport mode. The implications of the findings are that more refined estimates of both time and convenience are needed in the transportation analysis in Hong Kong, and that modal split models should be made sensitive to mode convenience, users' age and work characteristics as well as time and cost.
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description: ÐÐ¾Ð½Ð¾Ð³ÑÐ°ÑÐ¸Ñ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð° Ð² ÑÐ°Ð¼ÐºÐ°Ñ ÑÐµÐ¼Ñ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ð¹ Ð¿Ð¾ Ð³Ð¾ÑÑÐ´Ð°ÑÑÑÐ²ÐµÐ½Ð½Ð¾Ð¼Ñ Ð·Ð°Ð´Ð°Ð½Ð¸Ñ ÐÐ¸Ð½Ð¸ÑÑÐµÑÑÑÐ²Ð° Ð½Ð°ÑÐºÐ¸ Ð¸ Ð²ÑÑÑÐµÐ³Ð¾ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ñ Ð Ð¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð¤ÐµÐ´ÐµÑÐ°ÑÐ¸Ð¸ FSEG-2023-0012. ÐÐ·Ð»Ð¾Ð¶ÐµÐ½Ñ ÑÐ¸Ð·Ð¸ÑÐµÑÐºÐ¸Ðµ Ð¾ÑÐ½Ð¾Ð²Ñ Ð´ÑÐ³Ð¾Ð²Ð¾Ð³Ð¾ ÑÐ°Ð·ÑÑÐ´Ð°, Ð¼ÐµÑÐ°Ð½Ð¸Ð·Ð¼Ñ ÑÐ¾ÑÐ¼Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¿ÑÐ¸Ð²ÑÐ·ÐºÐ¸ Ð´ÑÐ³Ð¾Ð²Ð¾Ð³Ð¾ ÑÐ°Ð·ÑÑÐ´Ð° Ðº ÑÐ»ÐµÐºÑÑÐ¾Ð´Ð°Ð¼, Ð¾Ð¿Ð¸ÑÐ°Ð½Ñ ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÐµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ Ð¿ÑÐ¸ÑÐ»ÐµÐºÑÑÐ¾Ð´Ð½ÑÑ Ð¿ÑÐ¾ÑÐµÑÑÐ¾Ð². ÐÑÐ¸Ð²ÐµÐ´ÐµÐ½Ð° Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ° ÑÐ°ÑÑÐµÑÐ° ÑÐµÐ¿Ð»Ð¾ÑÐ¸Ð·Ð¸ÑÐµÑÐºÐ¸Ñ ÑÐ²Ð¾Ð¹ÑÑÐ² Ð¼Ð½Ð¾Ð³Ð¾ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½ÑÐ½Ð¾Ð¹ ÑÐµÑÐ¼Ð¸ÑÐµÑÐºÐ¾Ð¹ Ð¿Ð»Ð°Ð·Ð¼Ñ. ÐÐ¿Ð¸ÑÐ°Ð½Ð¾ Ð¼Ð½Ð¾Ð³Ð¾Ð¾Ð±ÑÐ°Ð·Ð¸Ðµ Ð¿ÑÐ¾ÑÐµÑÑÐ¾Ð², Ð¿ÑÐ¾Ð¸ÑÑÐ¾Ð´ÑÑÐ¸Ñ Ð² ÑÑÑÑÐ¾Ð¹ÑÑÐ²Ð°Ñ ÐºÐ¾Ð¼Ð¼ÑÑÐ°ÑÐ¸Ð¸ Ñ ÑÑÐ°ÑÑÐ¸ÐµÐ¼ ÑÐ»ÐµÐºÑÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð´ÑÐ³Ð¸: Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ»ÐµÐºÑÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð´ÑÐ³Ð¸, ÑÑÐ¾Ð·Ð¸Ñ ÑÐ»ÐµÐºÑÑÐ¾Ð´Ð¾Ð², Ð¸Ñ Ð²Ð¸Ð±ÑÐ°ÑÐ¸Ñ, Ð¾ÑÐ¾Ð±ÐµÐ½Ð½Ð¾ÑÑÐ¸ Ð³Ð°ÑÐµÐ½Ð¸Ñ ÑÐ»ÐµÐºÑÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð´ÑÐ³Ð¸ Ð¸ Ð¼Ð½Ð¾Ð³Ð¾Ðµ Ð´ÑÑÐ³Ð¾Ðµ. ÐÑÐ¸Ð²ÐµÐ´ÐµÐ½Ñ Ð¿ÑÐ¸Ð¼ÐµÑÑ Ð½ÐµÐºÐ¾ÑÐ¾ÑÑÑ Ð¼Ð¾Ð´ÐµÐ»ÐµÐ¹, ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð½ÑÑ Ð² ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÑ Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½ÑÑ Ð¿Ð°ÐºÐµÑÐ°Ñ. ÐÐ¾Ð½Ð¾Ð³ÑÐ°ÑÐ¸Ñ Ð¿ÑÐµÐ´Ð½Ð°Ð·Ð½Ð°ÑÐµÐ½Ð° Ð´Ð»Ñ Ð½Ð°ÑÑÐ½Ð¾- Ð¸ Ð¸Ð½Ð¶ÐµÐ½ÐµÑÐ½Ð¾-ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ñ ÑÐ°Ð±Ð¾ÑÐ½Ð¸ÐºÐ¾Ð² Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¹ ÐÐºÐ°Ð´ÐµÐ¼Ð¸Ð¸ Ð½Ð°ÑÐº, ÐÐÐ Ð¸ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¹, ÑÐ°Ð±Ð¾ÑÐ°ÑÑÐ¸Ñ ÐºÐ°Ðº Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ Ð¿Ð»Ð°Ð·Ð¼ÐµÐ½Ð½ÑÑ ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¹, ÑÐ°Ðº Ð¸ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ¸ ÑÐ»ÐµÐºÑÑÐ¸ÑÐµÑÐºÐ¸Ñ Ð°Ð¿Ð¿Ð°ÑÐ°ÑÐ¾Ð². ÐÐ½Ð° Ð¼Ð¾Ð¶ÐµÑ Ð±ÑÑÑ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð° ÐºÐ°Ðº ÑÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ Ð´Ð»Ñ ÑÑÑÐ´ÐµÐ½ÑÐ¾Ð² Ð²ÑÑÑÐ¸Ñ ÑÑÐµÐ±Ð½ÑÑ Ð·Ð°Ð²ÐµÐ´ÐµÐ½Ð¸Ð¹, Ð¾Ð±ÑÑÐ°ÑÑÐ¸ÑÑÑ Ð¿Ð¾ Ð½Ð°Ð¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸ÑÐ¼ Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²ÐºÐ¸ Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ¾Ð² Ð¸ Ð¼Ð°Ð³Ð¸ÑÑÑÐ¾Ð² Â«Ð¢ÐµÑÐ½Ð¸ÑÐµÑÐºÐ°Ñ ÑÐ¸Ð·Ð¸ÐºÐ°Â» Ð¸ Â«Ð­Ð»ÐµÐºÑÑÐ¾ÑÐ½ÐµÑÐ³ÐµÑÐ¸ÐºÐ° Ð¸ ÑÐ»ÐµÐºÑÑÐ¾ÑÐµÑÐ½Ð¸ÐºÐ°Â», Ð´Ð»Ñ Ð°ÑÐ¿Ð¸ÑÐ°Ð½ÑÐ¾Ð², Ð¾Ð±ÑÑÐ°ÑÑÐ¸ÑÑÑ Ð¿Ð¾ Ð½Ð°Ð¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Â«Ð­Ð»ÐµÐºÑÑÐ¾- Ð¸ ÑÐµÐ¿Ð»Ð¾ÑÐµÑÐ½Ð¸ÐºÐ°Â», Ð° ÑÐ°ÐºÐ¶Ðµ Ð² ÑÐ¸ÑÑÐµÐ¼Ð°Ñ Ð¿Ð¾ÑÐ»ÐµÐ²ÑÐ·Ð¾Ð²ÑÐºÐ¾Ð¹ Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²ÐºÐ¸ Ð¸ Ð² ÑÑÑÐµÐ¶Ð´ÐµÐ½Ð¸ÑÑ Ð´Ð¾Ð¿Ð¾Ð»Ð½Ð¸ÑÐµÐ»ÑÐ½Ð¾Ð³Ð¾ Ð¿ÑÐ¾ÑÐµÑÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ñ.
Atomic iron in nitrogen-doped carbon electrocatalysts for proton exchange membrane fuel cells
Creators: name: Pedersen, Angus Nils
Publisher: name: Imperial College London
Year: 2023

description: Atomic Fe in Nitrogen-doped Carbon (Fe-N-C) is investigated for the O2 reduction reaction in proton exchange membrane fuel cells (PEMFCs). Chapter 1 introduces the research motivation. Chapter 2 provides a literature review, scoping out gaps in the literature and thus the aims and objectives for the thesis. Chapter 3 covers the methods and characterisation techniques used in this thesis. Chapter 4 focusses on the development and characterisation of a novel Fe-N-C with high surface area and porosity, produced by an Mg-templating approach. It is found this synthesis leads to record in situ electrochemical active site (FeNx) utilisation in a rotating disc electrode. The FeNx sites exhibit an axial coordination with low turnover frequency . Therefore, the impact of axial and N-coordination is investigated via DFT. Chapter 5 investigates the operando Fe dissolution mechanism under inert (Ar) and active (O2) conditions of the Fe-N-C developed in Chapter 4, using both flow-cell and gas diffusion electrode (GDE) coupled to an online ICP-MS. During O2 reduction at 20oC in GDE, a mechanism of Fe dissolution and reprecipitation into FexOy occurs due to pH increasing in the catalyst layer. This is supported by post-mortem characterization and kinetic modelling. Chapter 6 examines the impacts of increasing the ionomer to catalyst ratio in H2-O2 fed PEMFCs. The Fe-N-C optimisation is probed using in situ electrochemical techniques. A uniquely high ionomer:Fe-N-C content is required for maximum performance due to the Fe-N-C’s high mesoporosity. Chapter 7 investigates the life cycle and techno-economic analysis of Fe-N-C versus Pt/C for PEMFCs. Fe-N-C production leads to lower predicted endpoint environmental impacts. Monetized environmental impacts are found to provide higher cost than the catalyst production. Based on the techno-economic analysis, the power density for Fe-N-C to compete with Pt/C is calculated. Chapter 8 provides conclusions and research directions.
Elliptic hypergeometry of supersymmetric dualities
Creators: name: Spiridonov, V. P.
name: Vartanov, G. S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give a full list of known $\mathcal{N}=1$ supersymmetric quantum field theories related by the Seiberg electric-magnetic duality conjectures for $SU(N), SP(2N)$ and $G_2$ gauge groups. Many of the presented dualities are new, not considered earlier in the literature. For all these theories we construct superconformal indices and express them in terms of elliptic hypergeometric integrals. This gives a systematic extension of the related Romelsberger and Dolan-Osborn results. Equality of indices in dual theories leads to various identities for elliptic hypergeometric integrals. About half of them were proven earlier, and another half represents new challenging conjectures. In particular, we conjecture a dozen new elliptic beta integrals on root systems extending the univariate elliptic beta integral discovered by the first author.
description: 70 pages, published version
Ultrafast 3-D ultrasound super-resolution imaging with a row-column array
Creators: name: Hansen-Shearer, Joe Thomas
Publisher: name: Imperial College London
Year: 2023

description: Row-column arrays are an emerging technology which aims to produce 3-D ultrasound images with a wide field of view and low channel count. The images produced with these types of probes suffer from strong artefacts and poor image quality when operated at high frame rates. This work aimed to improve the quality of the vascular images this probe could produce in vivo, via the implementation of ultrasound localisation microscopy. To do this a new coherence-based image reconstruction technique was developed. In this technique, the intrinsic incoherence of the row-column array architecture was exploited to reduce the artefact level, whilst also increasing the resolution and decreasing the noise. To further reduce the noise and increase the frame rate, acoustic sub-aperture processing was combined with a rolling reconstruction technique which enabled an effective frame rate of twice the pulse repetition frequency whilst also reducing the noise level. New row-column array-tailored isolation and localisation algorithms were developed and compared with preexisting reference techniques. The above algorithms were evaluated and optimised in silico, in vitro and in vivo on a rabbit’s kidney and on human volunteers’ thyroid and carotid artery. The new image reconstruction techniques were found to increase the signal-to-noise ratio by ~7.3 dB and reduce the artefact level by up to ~22 dB when compared to the traditional ultrafast reconstruction techniques. In vitro, it was found that the above techniques reduced the number of false localisations from ~26 % to ~15%. The new localisation techniques were found to increase the accuracy, precision and recall of super-localisation compared to a preexisting reference approach. However, the improvements came at a computational or usability cost. The above work was combined and optimised to produce an ultrasound localisation microscopy pipeline that could produce super-resolution imaging non-invasively in vivo using a row-column array in clinically reasonable timeframes.
Discovery of a New Population of Galactic HII Regions with Ionized Gas Velocity Gradients
Creators: name: Balser, Dana S.
name: Wenger, Trey V.
name: Anderson, L. D.
name: Armentrout, W. P.
name: Bania, T. M.
name: Dawson, J. R.
name: Dickey, John M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the kinematic properties of Galactic HII regions using radio recombination line (RRL) emission detected by the Australia Telescope Compact Array (ATCA) at 4-10 GHz and the Jansky Very Large Array (VLA) at 8-10 GHz. Our HII region sample consists of 425 independent observations of 374 nebulae that are relatively well isolated from other, potentially confusing sources and have a single RRL component with a high signal-to-noise ratio. We perform Gaussian fits to the RRL emission in position-position-velocity data cubes and discover velocity gradients in 178 (42%) of the nebulae with magnitudes between 5 and 200 m/s/arcsec. About 15% of the sources also have a RRL width spatial distribution that peaks toward the center of the nebula. The velocity gradient position angles appear to be random on the sky with no favored orientation with respect to the Galactic Plane. We craft HII region simulations that include bipolar outflows or solid body rotational motions to explain the observed velocity gradients. The simulations favor solid body rotation since, unlike the bipolar outflow kinematic models, they are able to produce both the large, > 40 m/s/arcsec, velocity gradients and also the RRL width structure that we observe in some sources. The bipolar outflow model, however, cannot be ruled out as a possible explanation for the observed velocity gradients for many sources in our sample. We nevertheless suggest that most HII region complexes are rotating and may have inherited angular momentum from their parent molecular clouds.
description: Accepted to ApJ
Study of flow induce vibration inside 3.5 inch hard disk drives.
Creators: name: Wichitpon Seepangmon
name: Sirivit Tachajestsadarangsri
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2014
Subjects: Actuator arm, Turbulence model, Computational fluid dynamics

description: 2, 41, KKU Engineering Journal
The study of leaching of heavy metals contaminant in cement pastes containing bagasse ashes
Creators: name: Worawanchai Saiwarin
name: Chuwit Napia
name: Theerawat Sinsiri
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2014
Subjects: Bagasse ash, Heavy metal, Pozzolanic, Compressive strength, Leaching

description: 2, 41, KKU Engineering Journal
Modelling ignition and burn in pre-magnetised inertial confinement fusion experiments
Creators: name: O'Neill, Sam Thomas Jack
Publisher: name: Imperial College London
Year: 2023

description: Ignition was first obtained in an Inertial Confinement Fusion (ICF) experiment in August 2021, a major milestone allowing the possibility of high energy gain through burn propagation. Use of external magnetic fields, applied primarily to reduce thermal losses, could increase hotspot temperature and ease requirements for ignition but have the potential to inhibit burn propagation. In this work, radiation-magnetohydrodynamics simulations carried out using the code Chimera are used to investigate the effect of a pre-imposed magnetic field on capsule dynamics, ignition and burn. Modelling of recent `symcap' experiments with applied axial fields of up to 26T shows enhancement of ion temperature by 33% and of fusion yield by 1.8. Implosion shape is elongated along the direction of applied field due to suppression of pre-heat at shock fronts. Anisotropic density and temperature profiles are observed in the hotspot. A scan over field magnitude shows that current experiments are close to the limit of performance enhancement. A study of magnetised burn propagation in an idealised planar model identifies three regimes of magnetised burn suppression: (1) thermal conduction driven; (2) alpha transport driven; and (3) fully suppressed. Extended-MHD effects at the burn front are important, particularly the Nernst term, in field transport close to the burn front, and a possible mechanism for the formation of a self-insulating layer is proposed due to a rapid growth in the Hall parameter. Simulations of the ignition shot N210808 with an applied 40T axial field show a ~ 50% reduction in fusion performance and clear indication of burn suppression perpendicular to field lines. Implosion shape is degraded by the field, and anisotropic conduction causes significant modification to the rate of ablation during stagnation. Yield is degraded through both suppression of burn and the impact of the field during hotspot formation.
An Algebraic Classification of Solution Generating Techniques
Creators: name: Borsato, Riccardo
name: Driezen, Sibylle
name: Hassler, Falk
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a two-fold problem: on the one hand, the classification of a family of solution-generating techniques in (modified) supergravity and, on the other hand, the classification of a family of canonical transformations of 2-dimensional $σ$-models giving rise to integrable-preserving transformations. Assuming a generalised Scherk-Schwarz ansatz, in fact, the two problems admit essentially the same algebraic formulation, emerging from an underlying double Lie algebra $\mathfrak d$. After presenting our derivation of the classification, we discuss in detail the relation to modified supergravity and the additional conditions to recover the standard (unmodified) supergravity. Starting from our master equation - that encodes all the possible continuous deformations allowed in the family of solution-generating techniques - we show that these are classified by the Lie algebra cohomologies $H^2(\mathfrak h,\mathbb R)$ and $H^3(\mathfrak h,\mathbb R)$ of the maximally isotropic subalgebra $\mathfrak h$ of the double Lie algebra $\mathfrak d$. {We illustrate our results with a non-trivial example, the bi-Yang-Baxter-Wess-Zumino model.
description: 8 pages