cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evaluating geographic access to cardiac catheterization facilities to inform regionalized models of care for acute myocardial infarction
Creators: name: Patel, Alka
Publisher: name: Graduate Studies
Year: 2012
Subjects: subject: Public Health
subject: Geographic Information Systems
subject: Health Services Research
subject: Access

description: Research has shown that regional acute myocardial infarction (AMI) care models reduce the time to treatment for percutaneous coronary intervention (PCI). By evaluating the areas with timely access it is possible to develop an evidence-based argument for the direct transfer of AMI patients in these areas to hospitals with specialized cardiac care. This program of research will show how applied geography using Geographic Information Systems (GIS), and administrative data can be used to describe current access to urgent, invasive, cardiac care in Canada and to understand the best practices when applying geographic tools to aid in health services planning through four sub-studies. Our results using administrative data suggest changing care over time and trends towards improved outcomes. These findings are in a context of clinical trial evidence in the published literature demonstrating the benefits of early procedural intervention for AMI patients. At the time of our study, we found that approximately 64% of the adult population had access to PCI across Canada, but that the proportion with access varied across provinces based on the distribution of the population and the number of existing facilities. This research also provided evidence that the addition of new facilities could increase the populations with access if placed appropriately. However, the modeling assumptions used for these estimates may not have been ideal for application in a Canadian context. The Canadian emergency medical services (EMS) on-scene intervals and response time intervals in rural areas were longer than those reported and incorporated from US studies. The application of the revised assumptions reduced the population proportion estimated to have access but still appropriately identified the larger areas with gaps in service. This program of research provides support that GIS is a valuable tool for evaluating those areas where regional care models could be implemented based on a specified pre-hospital time constraints. In light of our findings, we encourage researchers to use setting specific assumptions when possible and recognize the importance of understanding how the variations in modeling pre-hospital times can affect the estimated population access.
Understanding the Lived Experience of the School Principal: A Hermeneutic Study
Creators: name: Pamplin, Lori
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Education--Administration
subject: Leadership
subject: Principal
subject: Hermeneutics
subject: Lived Experience
subject: Professional Learning
subject: K-12
subject: Education
subject: School

description: In this inquiry the phenomenon of the principalship is opened up to create new understandings of what it means to be a principal. Educational literature hints at the complex and contingent nature of principal leadership, but does not address it sufficiently. This hermeneutic inquiry seeks to understand the always emergent, ambiguous, and contingent nature of being a school principal within a large urban school district. Understanding differently illuminates ways to support the development of principals through professional learning.
Broken Approach
Creators: name: Hope, Cat
Publisher: name: Monash University
Year: 2021
Subjects: subject: 190406 Music Composition
subject: FOS: Arts (arts, history of arts, performing arts, music)

description: BROKEN APPROACHCommissioned by Vanessa Tomlinson
For bass drum kit, a.m. radio’s and wind up mechanisms.

Featured on Cat Hope 'Ephemeral Rivers' CD, Hat[now]ART 200
This piece uses the Decibel ScorePlayer to read the score.
"The multi-coloured graphical score is a visual artwork in itself " Robert Lort. Read the full review here.

The percussionist uses a graphic score that outlines shapes that are drawn on instrument surfaces, or themes that are rendered spatially on each instrument and the kit as a whole. This work is made up of active sections, broken by static ‘rhythmic’ breaks that pause the forward non rhythmic motion in the piece, reversing the usual roles of rhythmic device. Wind up mechanisms, including clocks, tick away in the background, providing ‘alarms’ that wear down without breaking the onward motion. The score is presented ‘in motion’ on the Decibel ScorePlayer software, where it scrolls across a line indicating the point of performance. The piece was completed during a fellowship at Civitella Ranieri, in Umbria, Italy.NOTE TO PERFORMERS
The majority of my compositions use scores that are read on an iPad tablet computer, using the Decibel ScorePlayer, an application available on the App Store . Any fixed media is embedded in the score, and some feature automated functions. In the case of ensemble works, multiple iPads can be networked on a LAN or over the Internet so parts can be read in a synchronised way. You should upload the score file (ending with.dsz) to your iPad from your computer via AirDrop on an Apple, or cable from a PC. Instructions on how to do this and using the Decibel ScorePlayer, more generally are included in the Application, which ships with five other scores. Thus my works have different versions of the score, as you may see above. A PDF/PNG file of the score ‘image’, a DSZ file to upload onto the iPad for performance, and for some less complex scores, a video version. Hardcopies are also available from my publisher. You can find out more about the Decibel ScorePlayer, and how to make your own scores for it, here.
PERFORMANCES
Premiered 1 November, 2014 at the ﻿8 Hits ﻿program, broadcast live on ABC Classic FMN
Perth, WA, June 2016, at University of WA
USAUK
Efficient quantum computation of molecular forces and other energy gradients
Creators: name: O'Brien, Thomas E.
name: Streif, Michael
name: Rubin, Nicholas C.
name: Santagati, Raffaele
name: Su, Yuan
name: Huggins, William J.
name: Goings, Joshua J.
name: Moll, Nikolaj
name: Kyoseva, Elica
name: Degroote, Matthias
name: Tautermann, Christofer S.
name: Lee, Joonho
name: Berry, Dominic W.
name: Wiebe, Nathan
name: Babbush, Ryan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While most work on the quantum simulation of chemistry has focused on computing energy surfaces, a similarly important application requiring subtly different algorithms is the computation of energy derivatives. Almost all molecular properties can be expressed an energy derivative, including molecular forces, which are essential for applications such as molecular dynamics simulations. Here, we introduce new quantum algorithms for computing molecular energy derivatives with significantly lower complexity than prior methods. Under cost models appropriate for noisy-intermediate scale quantum devices we demonstrate how low rank factorizations and other tomography schemes can be optimized for energy derivative calculations. We perform numerics revealing that our techniques reduce the number of circuit repetitions required by many orders of magnitude for even modest systems. In the context of fault-tolerant algorithms, we develop new methods of estimating energy derivatives with Heisenberg limited scaling incorporating state-of-the-art techniques for block encoding fermionic operators. Our results suggest that the calculation of forces on a single nucleus may be of similar cost to estimating energies of chemical systems, but that further developments are needed for quantum computers to meaningfully assist with molecular dynamics simulations.
description: 48 pages, 14 page appendix, 10 figures. v2 contains updated lambdas (rescaling factors) for sparse FT encodings and some NISQ methods, obtained by localizing orbitals
Photometric Redshifts of Submillimeter Galaxies
Creators: name: Chakrabarti, Sukanya
name: Magnelli, Benjamin
name: McKee, Christopher F.
name: Lutz, Dieter
name: Berta, Stefano
name: Popesso, Paola
name: Pozzi, Francesca
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use the photometric redshift method of Chakrabarti & McKee (2008) to infer photometric redshifts of submillimeter galaxies with far-IR (FIR) $\it{Herschel}$ data obtained as part of the PACS Evolutionary Probe (PEP) program. For the sample with spectroscopic redshifts, we demonstrate the validity of this method over a large range of redshifts ($ 4 \ga z \ga 0.3$) and luminosities, finding an average accuracy in $(1+z_{\rm phot})/(1+z_{\rm spec})$ of 10%. Thus, this method is more accurate than other FIR photometric redshift methods. This method is different from typical FIR photometric methods in deriving redshifts from the light-to-gas mass ($L/M$) ratio of infrared-bright galaxies inferred from the FIR spectral energy distribution (SED), rather than dust temperatures. Once the redshift is derived, we can determine physical properties of infrared bright galaxies, including the temperature variation within the dust envelope, luminosity, mass, and surface density. We use data from the GOODS-S field to calculate the star formation rate density (SFRD) of sub-mm bright sources detected by AzTEC and PACS. The AzTEC-PACS sources, which have a threshold $850 \micron$ flux $\ga 5 \rm mJy$, contribute 15% of the SFRD from all ULIRGs ($L_{\rm IR} \ga 10^{12} L_{\odot}$), and 3% of the total SFRD at $z \sim 2$.
description: 7 pages, 2 figures, submitted to ApJ
Measuring Brain Connectivity and Hemodynamic Alterations Following Pediatric Mild Traumatic Brain Injury in the Primary Motor Cortex
Creators: name: Urban, Karolina
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Neuroscience
subject: Concussion
subject: mild traumatic brain injury
subject: functional near infrared spectroscopy
subject: optical imaging
subject: functional connectivity
subject: Coherence

description: Concussion, or mild traumatic brain injury, is a growing concern especially among the pediatric population. Symptoms may persist beyond one month after injury and result in long term disability called Post-Concussion Syndrome (PCS). There is a lack of measures to quantitatively monitor and explore pathophysiological mechanisms of PCS. We hypothesized that since fiber tracts are often impacted in concussion, functional activation and inter-hemispheric brain communication may be impaired. We used functional near-infrared spectroscopy (fNIRS) to quantify the magnitude of activation and inter-hemispheric communication between motor cortices using a coherence analysis. Subjects completed a resting state and tapping paradigm. We detected differences between patients and controls in coherence, suggesting alterations in inter-hemispheric communication. Given the critical need for a quantitative biomarker for recovery following a concussion, we present this data to highlight the potential of fNIRS, coupled with coherence analysis, as a sensitive measure to detect functional changes.
Relative localization of gravitational fields
Creators: name: Rylov, Yuri A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: A natural two-metric formalism, generated by the world function of the space-time, is used. This circumstance admits one to localize the relative gravitational field, which is described by a tensor.
description: 5pages, 0 figures
Black-Box Testing of Deep Neural Networks Through Test Case Diversity
Creators: name: Aghababaeyan, Zohreh
name: Abdellatif, Manel
name: Briand, Lionel
name: S, Ramesh
name: Bagherzadeh, Mojtaba
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Deep Neural Networks (DNNs) have been extensively used in many areas including image processing, medical diagnostics, and autonomous driving. However, DNNs can exhibit erroneous behaviours that may lead to critical errors, especially when used in safety-critical systems. Inspired by testing techniques for traditional software systems, researchers have proposed neuron coverage criteria, as an analogy to source code coverage, to guide the testing of DNN models. Despite very active research on DNN coverage, several recent studies have questioned the usefulness of such criteria in guiding DNN testing. Further, from a practical standpoint, these criteria are white-box as they require access to the internals or training data of DNN models, which is in many contexts not feasible or convenient. In this paper, we investigate black-box input diversity metrics as an alternative to white-box coverage criteria. To this end, we first select and adapt three diversity metrics and study, in a controlled manner, their capacity to measure actual diversity in input sets. We then analyse their statistical association with fault detection using four datasets and five DNN models. We further compare diversity with state-of-the-art white-box coverage criteria. Our experiments show that relying on the diversity of image features embedded in test input sets is a more reliable indicator than coverage criteria to effectively guide the testing of DNNs. Indeed, we found that one of our selected black-box diversity metrics far outperforms existing coverage criteria in terms of fault-revealing capability and computational time. Results also confirm the suspicions that state-of-the-art coverage metrics are not adequate to guide the construction of test input sets to detect as many faults as possible with natural inputs.
Managing data replication and distribution in the fog with FReD
Creators: name: Pfandzelter, Tobias
name: Japke, Nils
name: Schirmer, Trever
name: Hasenburg, Jonathan
name: Bermbach, David
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 000 Informatik, Informationswissenschaft, allgemeine Werke::000 Informatik, Wissen, Systeme::004 Datenverarbeitung; Informatik
subject: data distribution
subject: data replication
subject: fog computing
subject: internet of things

description: The heterogeneous, geographically distributed infrastructure of fog computing poses challenges in data replication, data distribution, and data mobility for fog applications. Fog computing is still missing the necessary abstractions to manage application data, and fog application developers need to re-implement data management for every new piece of software. Proposed solutions are limited to certain application domains, such as the IoT, are not flexible in regard to network topology, or do not provide the means for applications to control the movement of their data. In this paper, we present FReD, a data replication middleware for the fog. FReD serves as a building block for configurable fog data distribution and enables low-latency, high-bandwidth, and privacy-sensitive applications. FReD is a common data access interface across heterogeneous infrastructure and network topologies, provides transparent and controllable data distribution, and can be integrated with applications from different domains. To evaluate our approach, we present a prototype implementation of FReD and show the benefits of developing with FReD using three case studies of fog computing applications.
Discrimination of the Enantiotopic Faces of Structurally Unbiased Carbenium Ions Employing a Cyclohexadiene‐Based Chiral Hydride Source
Creators: name: Wolff, Benedikt
name: Qu, Zheng‐Wang
name: Grimme, Stefan
name: Oestreich, Martin
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::540 Chemie::547 Organische Chemie
subject: alkenes
subject: cationic reactions
subject: density functional calculations
subject: hydrogenation
subject: stereoselectivity

description: An enantioselective reduction of simple carbenium ions with cyclohexadienes containing a hydridic C−H bond at an asymmetrically substituted carbon atom is disclosed. The net reaction is a transfer hydrogenation of alkenes (styrenes) only employing chiral cyclohexadienes as dihydrogen surrogates. The trityl cation is used to initiate a Brønsted acid-promoted process, in which a delicate intermolecular capture of a carbenium-ion intermediate by the aforementioned chiral hydride source is enantioselectivity determining. Exclusively non-covalent interactions are rendering one of the transition states energetically more favored, giving the reduction products in good enantiomeric ratios. The computed reaction mechanism supports the present findings as well as previous results obtained from studies on other transfer-hydrogenation methods involving the cyclohexadiene platform.
Binary Encodings of Non-binary Constraint Satisfaction Problems: Algorithms and Experimental Results
Creators: name: Samaras, N.
name: Stergiou, K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: A non-binary Constraint Satisfaction Problem (CSP) can be solved directly using extended versions of binary techniques. Alternatively, the non-binary problem can be translated into an equivalent binary one. In this case, it is generally accepted that the translated problem can be solved by applying well-established techniques for binary CSPs. In this paper we evaluate the applicability of the latter approach. We demonstrate that the use of standard techniques for binary CSPs in the encodings of non-binary problems is problematic and results in models that are very rarely competitive with the non-binary representation. To overcome this, we propose specialized arc consistency and search algorithms for binary encodings, and we evaluate them theoretically and empirically. We consider three binary representations; the hidden variable encoding, the dual encoding, and the double encoding. Theoretical and empirical results show that, for certain classes of non-binary constraints, binary encodings are a competitive option, and in many cases, a better one than the non-binary representation.
Healthcare Providers' Evaluation of Quality and Educational Value of Webinar Series on COVID-19
Creators: name: Yee, YIP Yan
name: Hoon, CHEW Cheng
name: Kalaiarasu, M. PEARIASAMY
Publisher: name: Zenodo
Year: 2021
Subjects: Webinar Series on COVID-19
Healthcare Providers
continuing medical education
CME
quality and educational value

description: Introduction:
 COVID-19 pandemic necessitated the transition from in-person attendance to online continuing medical education (CME) for healthcare providers (HCPs). We investigated the perceptions of HCPs on the quality and educational value of Institute for Clinical Research (ICR) webinar series on COVID-19. Methodology:
 HCPs who participated in COVID-19 webinars between March 2020 to April 2021 were surveyed using Student Evaluation of Educational Quality (SEEQ) questionnaire. Data was analysed using Mann Whitney-U, Kruskal Wallis-H and Spearman Rank Correlation tests. Results:
 There were 244 respondents (83% female) with the mean age 35.3±8.8years and average work experience of 10.60±8.4 years. About 38.5% were professional category and 61.5% comprised allied health. In terms of seniority, 28.7% comprised those less than 4 years' work experience (junior), 43.9% between 5 to 14 years (mid-level) and 27.5% had more than 15 years' experience (senior). In the SEEQ questionnaire, almost all respondents rated either "good" or "very good" in each dimension. The mid-level HCPs had the highest mean score for value (p=0.018) and were more active in the Q&A (p=0.004) when compared to junior HCPs. The score for quality of speakers generally trended upwards with senior HCPs showing the highest mean score (p=0.039). Allied health personnel were more likely to take notes during presentations (p=0.032), view humorous presentations (p=0.015) and those with theoretical comparisons (p=0.050). There was positive correlation between HCP seniority with higher ratings for ICR's webinar organization (rs=0.159,p=0.013) and quality of speakers (rs=0.160,p=0.012). Conclusion:
 Quality of speakers and organizational support are key areas for successful HCPs webinars. Disclaimer: Abstract text might vary slightly from what is displayed in the e-poster.
description: This poster was submitted to the 14th National Conference for Clinical Research (NCCR) in August 18-20, 2021. https://nccrconference.com.my/
title: «Só me empolga o rigor com que o digo e não digo» Estudo sobre as Formas Breves na Obra Poética [1948-1988] de David Mourão-Ferreira
Creators: name: Andrade, Sofia
Publisher: name: RomaTrE-Press
Year: 2019

description: Di naufragi ne so più che il mare. La Cattedra “José Saramago” ricorda Giulia Lanciani
Gas Flow Sputtering of Pt/C Films and their Performance in Electrocatalytic Hydrogen Evolution Reaction
Creators: name: Bernsmeier, Denis
name: Selve, Sören
name: Nissen, Jörg
name: Maticiuc, Natalia
name: Ibaceta‐Jaña, Josefa
name: Szyszka, Bernd
name: Muydinov, Ruslan
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
subject: electrocatalysis
subject: gas flow sputtering
subject: hydrogen evolution reaction
subject: nanomaterials
subject: Pt/C film

description: A single step deposition technique of Pt/C films for electrocatalytic applications is presented. The hollow cathode gas flow sputtering (GFS) method allows a catalyst production within few minutes without further steps. The herein presented films consist of small Pt nanocrystals (2–5 nm) deposited in a matrix of nanocrystalline carbon. The films show a low and stable overpotential under acidic conditions in the hydrogen evolution reaction (HER). Relatively low Pt‐mass activity (<1 mA/μgPt) is attributed to the yet too high Pt‐content in the films. Another issue discovered in this work is a non‐graphitic state of carbon resulting in its high resistivity. Still, the GFS deposition technique providing by nature high deposition rates and a substance‐to‐material yield of 80–90 % is advantageous than other sputtering techniques and especially chemical methods in that sense. This technique is scalable to areas in the range of square meters and thus represents an attractive way to efficiently produce large‐scale cathode coatings for industrial electrolysers.
Membrane-Associated Thyroid Hormone Receptors Mediate Developmental Angiogenesis in Zebrafish (Danio rerio)
Creators: name: Konschuh, Shaelen Alanna
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Animal Physiology
subject: Biology--Molecular
subject: Physiology
subject: FOS: Biological sciences
subject: thyroid hormone
subject: angiogenesis
subject: Development
subject: Physiology
subject: endocrinology

description: Thyroid hormone (TH) is an important regulator of growth, differentiation, and metabolism. The function of nuclear thyroid receptors, which are ligand-activated transcription factors that regulate gene expression, has been well-studied. However, TH also induces signaling events that are mediated by a recently discovered membrane receptor. Angiogenesis has been identified as a downstream physiological function influenced by TH membrane signaling. The primary objective of my thesis was to investigate the role of TH in the developing vertebrate vasculature during embryogenesis. My study provides important novel information showing that TH is involved in angiogenesis during embryonic development in the zebrafish and regulates vascular sprouting, morphology, and patterning. I have also shown that the control of angiogenesis by TH is only partially influenced by changes in the expression level of angiogenic genes. The limited transcriptional sensitivity that I observed indicates it is likely that other factors predominantly underlie the vascular response to TH.
DDPG-Driven Deep-Unfolding with Adaptive Depth for Channel Estimation with Sparse Bayesian Learning
Creators: name: Hu, Qiyu
name: Shi, Shuhan
name: Cai, Yunlong
name: Yu, Guanding
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Deep-unfolding neural networks (NNs) have received great attention since they achieve satisfactory performance with relatively low complexity. Typically, these deep-unfolding NNs are restricted to a fixed-depth for all inputs. However, the optimal number of layers required for convergence changes with different inputs. In this paper, we first develop a framework of deep deterministic policy gradient (DDPG)-driven deep-unfolding with adaptive depth for different inputs, where the trainable parameters of deep-unfolding NN are learned by DDPG, rather than updated by the stochastic gradient descent algorithm directly. Specifically, the optimization variables, trainable parameters, and architecture of deep-unfolding NN are designed as the state, action, and state transition of DDPG, respectively. Then, this framework is employed to deal with the channel estimation problem in massive multiple-input multiple-output systems. Specifically, first of all we formulate the channel estimation problem with an off-grid basis and develop a sparse Bayesian learning (SBL)-based algorithm to solve it. Secondly, the SBL-based algorithm is unfolded into a layer-wise structure with a set of introduced trainable parameters. Thirdly, the proposed DDPG-driven deep-unfolding framework is employed to solve this channel estimation problem based on the unfolded structure of the SBL-based algorithm. To realize adaptive depth, we design the halting score to indicate when to stop, which is a function of the channel reconstruction error. Furthermore, the proposed framework is extended to realize the adaptive depth of the general deep neural networks (DNNs). Simulation results show that the proposed algorithm outperforms the conventional optimization algorithms and DNNs with fixed depth with much reduced number of layers.
description: 16 pages, 14 figures
Real‐time monitoring of biomass during Escherichia coli high‐cell‐density cultivations by in‐line photon density wave spectroscopy
Creators: name: Schiewe, Thomas
name: Gutschmann, Björn
name: Santolin, Lara
name: Waldburger, Saskia
name: Neubauer, Peter
name: Hass, Roland
name: Riedel, Sebastian L.
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie
subject: E. coli
subject: high cell density fed batch
subject: inline sensor
subject: PAT
subject: photon density wave spectroscopy
subject: real‐time monitoring of biomass

description: An efficient monitoring and control strategy is the basis for a reliable production process. Conventional optical density (OD) measurements involve superpositions of light absorption and scattering, and the results are only given in arbitrary units. In contrast, photon density wave (PDW) spectroscopy is a dilution‐free method that allows independent quantification of both effects with defined units. For the first time, PDW spectroscopy was evaluated as a novel optical process analytical technology tool for real‐time monitoring of biomass formation in Escherichia coli high‐cell‐density fed‐batch cultivations. Inline PDW measurements were compared to a commercially available inline turbidity probe and with offline measurements of OD and cell dry weight (CDW). An accurate correlation of the reduced PDW scattering coefficient µs′ with CDW was observed in the range of 5–69 g L−1 (R2 = 0.98). The growth rates calculated based on µs′ were comparable to the rates determined with all reference methods. Furthermore, quantification of the reduced PDW scattering coefficient µs′ as a function of the absorption coefficient µa allowed direct detection of unintended process trends caused by overfeeding and subsequent acetate accumulation. Inline PDW spectroscopy can contribute to more robust bioprocess monitoring and consequently improved process performance.
Robust and efficient estimation of nonparametric generalized linear models
Creators: name: Kalogridis, Ioannis
name: Claeskens, Gerda
name: Van Aelst, Stefan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Generalized linear models are flexible tools for the analysis of diverse datasets, but the classical formulation requires that the parametric component is correctly specified and the data contain no atypical observations. To address these shortcomings we introduce and study a family of nonparametric full rank and lower rank spline estimators that result from the minimization of a penalized power divergence. The proposed class of estimators is easily implementable, offers high protection against outlying observations and can be tuned for arbitrarily high efficiency in the case of clean data. We show that under weak assumptions these estimators converge at a fast rate and illustrate their highly competitive performance on a simulation study and two real-data examples.
title: The Blue Engineer : IngenieurInnen mit ökologischer und sozialer Verantwortung. Ausgabe 03, Sommersemester 2013
title: The Blue Engineer : Engineers with ecological and social responsibility. Issue 03, summer term 2013
titleType: AlternativeTitle
Creators: name: Blue Engineering AG TUHH
Publisher: name: TUHH Universitätsbibliothek
Year: 2013
Subjects: subject: Nachhaltigkeit
subject: Recycling, Wiederverwendung von Rohstoffen
subject: Big Data
subject: sustainability
subject: recycling
subject: reuse of materials
subject: 620: Ingenieurwissenschaften
subject: Nachhaltige Entwicklung
subject: Universität
subject: Ingenieurwissenschaften
subject: Hamburg / Technische Universität
subject: 620

description: The Blue Engineer hat sich der Aufgabe gewidmet, über inner- und außeruniversitäre Themen mit Bezug zu ganzheitlich verstandener Nachhaltigkeit zu berichten.
Partial wave expansion for photoproduction of two pseudoscalars on a nucleon
Creators: name: Fix, A.
name: Arenh"ovel, H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The amplitudes for photoproduction of two pseudoscalars on a nucleon are expanded in the overall c.m. frame in a model independent way with respect to the contribution of the final state partial wave of total angular momentum $J$ and its projection on the normal to the plane spanned by the momenta of the final particles. The expansion coefficients which are analogues to the multipole amplitudes for single meson photoproduction contain the complete information about the reaction dynamics. Results of an explicit evaluation are presented for the moments $W_{jm}$ of the inclusive angular distribution of an incident photon beam with respect to the c.m.\ coordinate system defined by the final particles taking photoproduction of $π^0π^0$ and $π^0η$ as an example.
description: 9 pages, 3 figures
A comprehensive study of the velocity, momentum and position matrix elements for Bloch states using a local orbital basis
Creators: name: Esteve-Paredes, J. J.
name: Palacios, J. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a comprehensive study of the velocity operator, $\hat{\boldsymbol{v}}=\frac{i}{\hbar} [\hat{H},\hat{\boldsymbol{r}}]$, when used in crystalline solids calculations. The velocity operator is key to the evaluation of a number of physical properties and its computation, both from a practical and fundamental perspective, has been a long-standing debate for decades. Our work summarizes the different approaches found in the literature, connecting them and filling the gaps in the sometimes non-rigorous derivations. In particular we focus on the use of local orbital basis sets where the velocity operator cannot be approximated by the $k$-derivative of the Bloch Hamiltonian matrix. Among other things, we show how the correct expression can be found without unequivocal mathematical steps, how the Berry connection makes its way in this expression, and how to properly deal with the two popular gauge choices that coexist in the literature. Finally, we explore its use in density functional theory calculations by comparing with its real-space evaluation through the identification with the canonical momentum operator. This comparison offers us, in addition, a glimpse of the importance of non-local corrections, which may invalidate the naive momentum-velocity correspondence.
description: 12 pages, 4 figures
Patterns of habitat fragmentation and contaminant exposure in longnose dace (Rhinichthys cataractae)
Creators: name: Tunna, Haley
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Genetics
subject: microsatellite
subject: molecular ecology
subject: fragmentation
subject: contaminants
subject: Rhinichthys cataractae
subject: fish
subject: environmental change

description: Human-induced environmental change occurs rapidly and challenges the persistence of organisms. I studied patterns of contaminants and habitat fragmentation on longnose dace (Rhinichthys cataractae). I compared liver biotransformation and age-structured sex ratios at sites upstream and downstream of anthropogenic inputs. Downstream of anthropogenic inputs, female biases in the oldest age classes shift to female biases in all age classes relative to upstream sites. Liver biotransformation reflects an urban footprint. Together these results suggest that contaminants may adversely affect fish health. Dams and weirs are barriers to fish movement and can reduce connectivity and genetic diversity of populations. Results from population genetic analyses using microsatellite DNA markers show substantial gene flow and overall weak population genetic structure across Alberta. Consequently, fragmentation did not alter connectivity of dace in Alberta. Overall, longnose dace in Alberta have spatially and temporally variable sex ratios and exhibit weak population structure in association with human activities.
Free Energy vs Sasaki-Einstein Volume for Infinite Families of M2-Brane Theories
Creators: name: Amariti, Antonio
name: Franco, Sebastian
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate infinite families of 3d N=2 superconformal Chern-Simons quivers with an arbitrarily large number of gauge groups arising on M2-branes over toric CY_4's. These theories have the same matter content and superpotential of those on D3-branes probing cones over L^{a,b,a} Sasaki-Einstein manifolds. For all these infinite families, we explicitly show the correspondence between the free energy F on S^3 and the volume of the 7-dimensional base of the associated CY_4, even before extremization. Our results add to those existing in the literature, providing further support for the correspondence. We develop a lifting algorithm, based on the Type IIB realization of these theories, that takes from CY_3's to CY_4's and we use it to efficiently generate the models studied in the paper. We also introduce a procedure, based on the mapping between extremal points in the toric diagram (GLSM fields) and chiral fields in the quiver, which systematically translates symmetries of the toric diagram into constraints of the trial R-charges of the quiver, beyond those arising from marginality of the superpotential. This method can be exploited for reducing the dimension of the space of trial R-charges over which the free energy is maximized. Finally, we show that in all the infinite families we consider F^2 can be expressed, even off-shell, as a quartic function in R-charges associated to certain 5-cycles. This suggests that a quartic formula on R-charges, analogous to a similar cubic function for the central charge a in 4d, exists for all toric toric CY_4's and we present some ideas regarding its general form.
description: 42 pages, 20 figures
Majorana bound states in encapsulated bilayer graphene
Creators: name: Peñaranda, Fernando
name: Aguado, Ramón
name: Prada, Elsa
name: San-Jose, Pablo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The search for robust topological superconductivity and Majorana bound states continues, exploring both one-dimensional (1D) systems such as semiconducting nanowires and two-dimensional (2D) platforms. In this work we study a 2D approach based on graphene bilayers encapsulated in transition metal dichalcogenides that, unlike previous proposals involving the Quantum Hall regime in graphene, requires weaker magnetic fields and does not rely on interactions. The encapsulation induces strong spin-orbit coupling on the graphene bilayer, which opens a sizeable gap and stabilizes fragile pairs of helical edge states. We show that, when subject to an in-plane Zeeman field, armchair edges can be transformed into p-wave one-dimensional topological superconductors by contacting them laterally with conventional superconductors. We demonstrate the emergence of Majorana bound states (MBSs) at the sample corners of crystallographically perfect flakes, belonging either to the D or the BDI symmetry classes depending on parameters. We compute the phase diagram, the resilience of MBSs against imperfections, and their manifestation as a 4$π$-periodic effect in Josephson junction geometries, all suggesting the existence of a topological phase within experimental reach.
description: 9 pages, 7 figures. Final version with an extra appendix
A Thiazole‐linked Covalent Organic Framework for Lithium‐Sulphur Batteries
Creators: name: Yan, Rui
name: Mishra, Bikash
name: Traxler, Michael
name: Roeser, Jérôme
name: Chaoui, Nicolas
name: Kumbhakar, Bidhan
name: Schmidt, Johannes
name: Li, Shuang
name: Thomas, Arne
name: Pachfule, Pradip
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
subject: chemical stability
subject: covalent organic frameworks
subject: crystallinity
subject: lithium-sulphur batteries
subject: post-synthetic modification

description: Lithium‐sulphur (Li−S) batteries are a promising alternative power source, as they can provide a higher energy density than current lithium‐ion batteries. Porous materials are often used as cathode materials as they can act as a host for sulphur in such batteries. Recently, covalent organic frameworks (COFs) have also been used, however they typically suffer from stability issues, resulting in limited and thus insufficient durability under practical conditions and applications. Herein, we report the synthesis of a crystalline and porous imine‐linked triazine‐based dimethoxybenzo‐dithiophene functionalized COF (TTT‐DMTD) incorporating high‐density redox sites. The imine linkages were further post‐synthetically transformed to yield a robust thiazole‐linked COF (THZ‐DMTD) by utilizing a sulphur‐assisted chemical conversion method, while maintaining the crystallinity. As a synergistic effect of its high crystallinity, porosity and the presence of redox‐active moieties, the thiazole‐linked THZ‐DMTD exhibited a high capacity and long‐term stability (642 mAh g−1 at 1.0 C; 78.9 % capacity retention after 200 cycles) when applied as a cathode material in a Li−S battery.
Directional Search for Isospin-Violating Dark Matter with Nuclear Emulsion
Creators: name: Nagao, Keiko I.
name: Naka, Tatsuhiro
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Some of direct dark matter searches reported not only positive signals but also annual modulation of the signal event. However, the parameter spaces have been excluded by other experiments. Isospin violating dark matter solves the contradiction by supposing different coupling to proton and neutron. We study the possibility to test the favored parameter region by isospin violating dark matter model with the future detector of dark matter using the nuclear emulsion. Since the nuclear emulsion detector has directional sensitivity, the detector is expected to examine whether the annual modulations observed other experiments is caused by dark matter or background signals.
description: Prepared for the proceedings of the International Workshop on Grand Unified Theories (GUT2012) held at Yukawa Institute for Theoretical Physics, Kyoto, Japan, March 2012
The Two Faces of Carbenium Ions: Intermolecular Trapping of Prochiral Carbocations with Stereocontrol
Creators: name: Wolff, Benedikt
name: Oestreich, Martin
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::540 Chemie::547 Organische Chemie
subject: carbocations
subject: chiral anions
subject: diastereoselectivity
subject: enantioselectivity
subject: SN1 reaction

description: Carbenium ions had been suspected and subsequently shown to be key intermediates of a large family of cationic transformations. An enormous body of work is dedicated to their characterization and various roles in reaction mechanisms, e. g. the SN1 reaction. Far less attention has been paid to their engagement in asymmetric synthesis and indeed, the differentiation of the diastereo‐ or even enantiotopic faces of structurally unbiased, non‐heteroatom‐stabilized carbenium ions is a daunting challenge. This Review summarizes the approaches taken to achieve the stereoselective addition of nucleophiles to these fleeting intermediates, including recent advances where non‐covalent interactions and chiral counterions are employed to discriminate either side of a trigonal‐planar carbenium ion bearing three different substituents.
SciModeler@MODELSWARD'21: Online Supplements
Creators: name: Nuijten, Raoul
name: Gorp, Pieter Van
Publisher: name: figshare
Year: 2020
Subjects: subject: 80604 Database Management
subject: FOS: Computer and information sciences
subject: 111712 Health Promotion
subject: FOS: Health sciences

description: SciModeler is a metamodel and a graph-based tool prototype to: 1) encode theories in a semantic structure, 2) record the outcomes of empirical studies, and relate these to scientific theories, 3) query across different theories and supportive empirical data to explore latent relationships, and 4) identify opportunities for simplifying theories via graph transformations.
On the generators of quantum dynamical semigroups with invariant subalgebras
Creators: name: Hasenöhrl, Markus
name: Caro, Matthias C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The problem of characterizing GKLS-generators and CP-maps with an invariant appeared in different guises in the literature. We prove two unifying results which hold even for weakly closed *-algebras: First, we show how to construct a normal form for $\mathcal{A}$-invariant GKLS-generators, if a normal form for $\mathcal{A}$-invariant CP-maps is known - rendering the two problems essentially equivalent. Second, we provide a normal form for $\mathcal{A}$-invariant CP-maps if $\mathcal{A}$ is atomic (which includes the finite-dimensional case). As an application we reproduce several results from the literature as direct consequences of our characterizations and thereby point out connections between different fields.
description: 20+7 pages; small improvements to the presentation; close to published version
Parameter Identification of a PN-Guided Incoming Missile Using an Improved Multiple-Model Mechanism
Creators: name: Wang, Yinhan
name: Wang, Jiang
name: Fan, Shipeng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: An active defense against an incoming missile requires information of it, including a guidance law parameter and a first-order lateral time constant. To this end, assuming that a missile with a proportional navigation (PN) guidance law attempts to attack an aerial target with bang-bang evasive maneuvers, a parameter identification model based on the gated recurrent unit (GRU) neural network is built in this paper. The analytic identification solutions for the guidance law parameter and the first-order lateral time constant are derived. The inputs of the identification model are available kinematic information between the aircraft and the missile, while the outputs contain the regression results of missile parameters. To increase the training speed and the identification accuracy of the Model, an output processing method called improved multiplemodel mechanism (IMMM) is proposed in this paper. The effectiveness of IMMM and the performance of the established model are demonstrated through numerical simulations under various engagement scenarios.
description: 9 pages, 10 figures
Nkx3.2 regulates zebrafish vascular stabilization through recruitment of mural cells
Creators: name: Spice, Peter James
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Biology--Cell
subject: zebrafish
subject: mural cell
subject: endothelial cell
subject: Vascular development
subject: stabilization

description: Vascular stabilization is the process during vascular development where the immature endothelial cell tube gains structural support through the recruitment and adhesion of perivascular mural cells; pericytes and vascular smooth muscle cells (vSMC). When vessels are not well supported by mural cells hemorrhage can occur. Nkx3.2 deficient zebrafish embryos hemorrhage, have reduced expression of a mural cell marker, and the endothelial layer makes less contact with mural cells compared with controls. I found that nkx3.2 regulates the expression of two genes with known roles in neural crest migration and specification; pdgfrα and sox10. Further, nkx3.2 functions autonomously in neural crest cells, where knockdown of nkx3.2 causes abnormal migration of neural crest cells in the head. These results show that nkx3.2 regulates genes involved in neural crest migration and in turn supports recruitment of mural cells to mediate vascular stabilization.
Upper bounds for the Stanley-Wilf limit of 1324 and other layered patterns
Creators: name: Claesson, Anders
name: Jelínek, Vít
name: Steingrímsson, Einar
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We prove that the Stanley-Wilf limit of any layered permutation pattern of length $\ell$ is at most $4\ell^2$, and that the Stanley-Wilf limit of the pattern 1324 is at most 16. These bounds follow from a more general result showing that a permutation avoiding a pattern of a special form is a merge of two permutations, each of which avoids a smaller pattern. If the conjecture is true that the maximum Stanley-Wilf limit for patterns of length $\ell$ is attained by a layered pattern then this implies an upper bound of $4\ell^2$ for the Stanley-Wilf limit of any pattern of length $\ell$. We also conjecture that, for any $k\ge 0$, the set of 1324-avoiding permutations with $k$ inversions contains at least as many permutations of length $n+1$ as those of length $n$. We show that if this is true then the Stanley-Wilf limit for 1324 is at most $e^{π\sqrt{2/3}} \simeq 13.001954$.