cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ultraviolet light emission from tunnelling metal-insulator-semiconductor devices
Creators: name: Lin, Chen-Sheng
Publisher: name: Imperial College London
Year: 2018

description: High efficient light emitting diodes (LEDs) have been successfully applied to the visible lighting market for many years. However, the development of ultraviolet (UV) LEDs is still hindered, where the efficiency of UV-LEDs is significantly lower than that of visible LEDs. The challenges come from the difficulty of obtaining efficient p-type doped AlxGa1-xN (especially for the high-aluminium-content materials), light absorption by the p-type layer, and the complexity of device structures. These problems have motivated the investigation for the feasibility of non p-doped UV emitters. This thesis presents a study of UV emissions from simple metal-insulator-semiconductor (MIS) tunnel light emitting diodes, with simple structures and without p-doped layers. Firstly, epitaxial thin film were deposited and characterized layer by layer, where n-type AlxGa1-xN film was used as the active layer and AlN film was used as the insulator layer followed by a semi-transparent metal thin layer for current spreading. Device with different thicknesses of AlN were compared, and its thickness of 10 nm resulted in optimized diode behaviour and maximum UV emissions. More importantly, a region of clear negative differential resistance was observed in the I-V characteristic, indicating free holes in the valence band of n-type active layer are most likely generated by resonant tunnelling. A decrease in emitted intensity at high injection currents was observed, which is attributed to a reduction in the density of conduction band electrons via Fowler-Nordheim tunnelling occurring in parallel. A defect band in the AlN barrier layer is suggested as the origin of the quantum states via which the resonant tunnelling occurs. Finally, from the measurements of electroluminescence on both the n-GaN based and the n-AlxGa1-xN (x = 0.14) based MIS diodes, near band-edge UV emissions of 365 nm and 335 nm were achieved respectively. Through the study of MIS light emitting diodes and their achievement of UV light emissions, this research provides a potential solution to solve the problems of current low-efficiency p-n junction based UVLEDs.
Adaptive Dereverberation, Noise and Interferer Reduction Using Sparse Weighted Linearly Constrained Minimum Power Beamforming
Creators: name: Gode, Henri
name: Doclo, Simon
Publisher: name: arXiv
Year: 2023
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Interfering sources, background noise and reverberation degrade speech quality and intelligibility in hearing aid applications. In this paper, we present an adaptive algorithm aiming at dereverberation, noise and interferer reduction and preservation of binaural cues based on the wBLCMP beamformer. The wBLCMP beamformer unifies the multi-channel weighted prediction error method performing dereverberation and the linearly constrained minimum power beamformer performing noise and interferer reduction into a single convolutional beamformer. We propose to adaptively compute the optimal filter by incorporating an exponential window into a sparsity-promoting lp-norm cost function, which enables to track a moving target speaker. Simulation results with successive target speakers at different positions show that the proposed adaptive version of the wBLCMP beamformer outperforms a non-adaptive version in terms of objective speech enhancement performance measures.
description: 30th European Signal Processing Conference (EUSIPCO 2022)
Role of innate lymphoid cells in paediatric severe therapy resistant asthma
Creators: name: Nagakumar, Prasad
Publisher: name: Imperial College London
Year: 2017

description: Background Children with severe therapy-resistant asthma (STRA) have poor control despite maximal therapy. The pattern of airway inflammation in severe disease may therefore be less steroid sensitive. Innate lymphoid cells (ILCs) are immune cells of lymphoid morphology that do not express typical antigen receptors but mirror the functions of T cells. They are classified into three groups. ILC2s express CD127 and CRTH2, secrete Th2 cytokines, express GATA3 and are induced by IL-33 which is steroid resistant and increased in paediatric STRA. I hypothesised that airway ILC2s are increased in STRA and are steroid resistant, thus contributing to disease pathology. I characterised ILC2s in induced sputum (IS), broncho-alveolar lavage (BAL) and peripheral blood (PBMC) in children with STRA compared to non-asthmatic controls and investigated their response to systemic steroids. Methods BAL, PBMCs and IS were obtained from 18 STRA children and 16 with chronic inflammation (CI) undergoing a clinically indicated bronchoscopy. IS was obtained in an additional 13 children with STRA and 6 with CI. Cells were analysed by multi-parametric flow cytometry for ILC and Th2 markers. Assessments of sputum ILCs were performed in STRA before and after systemic steroids. In vitro cultures of PBMCs were undertaken to determine ILC and T cell responses to allergen and steroids. Results ILC2s were identified in IS from STRA, but not CI, and were significantly higher in BAL and sputum than PBMCs in STRA. Th2 cells were ten-fold higher than ILC2s in all compartments. Sputum ILC2s decreased following systemic steroids and PBMC cultures showed a significant reduction in ILC2s with steroids. Conclusion ILC2s were elevated in children with STRA and were more abundant in airways than peripherally. However, Th2 cells were the predominant lymphoid airway cell type. Unlike IL-33, ILC2s were steroid sensitive thus their contribution in mediating severe, steroid resistant disease remains uncertain
title: Beitrag des Vertriebs auf die Beschwerdezufriedenheit im B2B-Dienstleistungssektor
Creators: name: Plöbst, Carina
Publisher: name: FH CAMPUS 02 (CAMPUS 02 Fachhochschule der Wirtschaft)
Year: 2024
Subjects: subject: 658 Allgemeines Management

description: Die volatilen Marktgegebenheiten und der steigende Wettbewerbsdruck im B2B-Dienstleistungssektor fordern stetige Verbesserung der Unternehmensprozesse und bieten Potenzial, durch Beschwerdemanagement strategische Wettbewerbsvorteile zu erlangen. Nach misslungener Leistungserbringung können unzufriedene Kund*innen durch Erreichen von Beschwerdezufriedenheit wieder an das Unternehmen gebunden werden. Ziel der vorliegenden Arbeit ist, den Beitrag des Vertriebs auf die Beschwerdezufriedenheit anhand des direkten Beschwerdemanagementprozesses im B2B-Dienstleistungssektor zu eruieren. Die Erkenntnisse aus der Literaturrecherche werden um eine empirische Studie in Form von Expert*inneninterviews angereichert. Diese zeigen, dass der Vertrieb in B2B-Dienstleistungsunternehmen, durch eine geschulte, proaktive und offene Kommunikation gegenüber Kund*innen, einen positiven Beitrag zur Beschwerdestimulierung leistet. Es gilt, eine qualifizierte Bündelung von Informationen, Erwartungshaltungen und Prioritäten durchzuführen. Die Sicherstellung der zeitnahen Erledigung, die laufende Informationsübermittlung an Kund*innen sowie die direkte Mitteilung der Beschwerdereaktion stellen den positiven Beitrag des Vertriebs auf die Beschwerdezufriedenheit dar. In Kombination mit bereits bestehenden Ansätzen können nützliche Erkenntnisse für die Wissenschaft und die Managementpraxis geliefert werden.
description: Volatile market conditions and increasing competitive pressure in the B2B service sector require continuous improvement of business processes and offer the potential to gain strategic competitive advantage through complaint management. After unsuccessful service provision, dissatisfied customers can be tied back to the company by achieving complaint satisfaction. This master thesis aims to investigate the contribution of sales to complaint satisfaction through the direct complaint management process in the B2B service sector. An empirical study in the form of expert interviews enriches the findings of the literature research. This shows that sales in B2B service companies positively contribute to the stimulation of complaints through trained, proactive, and open communication with customers. It is essential to carry out a qualified bundling of information, expectations, and priorities. Ensuring prompt settlement, the ongoing transmission of information to customers, and the direct communication of the complaint response represent the positive contribution of sales to complaint satisfaction. Combined with existing approaches valuable insights can be delivered for science and management practice.
A novel scheme for simulating the force-free equations: boundary conditions and the evolution of solutions towards stationarity
Creators: name: Carrasco, Federico
name: Reula, Oscar
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Force-Free Electrodynamics (FFE) describes a particular regime of magnetically dominated relativistic plasmas, which arises on several astrophysical scenarios of interest such as pulsars or active galactic nuclei. In this article, we present a full 3D numerical implementation of the FFE evolution around a Kerr black hole. The novelty of our approach is three-folded: i) We use the "multi-block" technique to represent a domain with $S^2 \times \mathbb{R}^{+}$ topology within a stable finite-differences scheme. ii) We employ as evolution equations those arising from a covariant hyperbolization of the FFE system. iii) We implement stable and constraint-preserving boundary conditions to represent an outer region given by a uniform magnetic field aligned or misaligned respect to the symmetry axis. We find stationary jet solutions which reach equilibrium --through boundary conditions-- with the outer numerical surface. This is so, even when the outer boundary is located very close to the central region (i.e. $r_{out}\sim 10M $). These numerical solutions reproduce most of the known results for analogue astrophysical settings.
description: 18 pages, 17 figures
An electronic origin of charge order in infinite-layer nickelates
Creators: name: Chen, Hanghui
name: Yang, Yi-feng
name: Zhang, Guang-Ming
name: Liu, Hongquan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A charge order (CO) with a wavevector $\mathbf{q}\simeq\left(\frac{1}{3},0,0\right)$ is observed in infinite-layer nickelates. Here we use first-principles calculations to demonstrate a charge-transfer-driven CO mechanism in infinite-layer nickelates, which leads to a characteristic Ni$^{1+}$-Ni$^{2+}$-Ni$^{1+}$ stripe state. For every three Ni atoms, due to the presence of near-Fermi-level conduction bands, Hubbard interaction on Ni-$d$ orbitals transfers electrons on one Ni atom to conduction bands and leaves electrons on the other two Ni atoms to become more localized. We further derive a low-energy effective model to elucidate that the CO state arises from a delicate competition between Hubbard interaction on Ni-$d$ orbitals and charge transfer energy between Ni-$d$ orbitals and conduction bands. With physically reasonable parameters, $\mathbf{q}=\left(\frac{1}{3},0,0\right)$ CO state is more stable than uniform paramagnetic state and usual checkerboard antiferromagnetic state. Our work highlights the multi-band nature of infinite-layer nickelates, which leads to some distinctive correlated properties that are not found in cuprates.
description: 29 pages and 5 figures
Gene regulation by mRNA isoforms and ncRNAs during budding yeast gametogenesis
Creators: name: Chia, Minghao
Publisher: name: Imperial College London
Year: 2018

description: Cell differentiation is fundamental to multi-cellular life because a single unspecialized zygote must give rise to all specialized cell types in the body. Cell fate specification requires the coordinated regulation of different genes across developmental time. How genes are regulated during cell differentiation is a longstanding question in biology. Gametogenesis in budding yeast is a cell differentiation program where a diploid cell gives rise to four haploid gametes and is a tractable model to understand gene regulation during development. Multiple studies in various vertebrate systems suggest that a significant fraction of genes are expressed as different transcript isoforms arising from alternative transcription start sites, or overlap with non-coding RNAs (ncRNAs) of unknown function. Here, I investigated how transcript isoforms or overlapping ncRNAs regulate gene expression during budding yeast gametogenesis. First, I showed that the kinetochore gene NDC80 is repressed by transcription of a 5’ extended mRNA isoform from an alternative promoter during early gametogenesis. This repressive mechanism required the co-transcriptional deposition of histone modifications and the stabilization of nucleosomes at the canonical NDC80 promoter. NDC80 repression could also be rapidly reversed to allow cells to re-enter mitosis if they were no longer starved. Next, I showed how a genome-wide approach called transcript end sequencing (TE-seq) could distinguish the ends of overlapping transcripts. TE-seq analysis showed over a thousand meiotic upstream transcripts or isoforms upregulated at specific stages of gametogenesis. Upstream overlapping transcription was associated with different regulatory outcomes on coding genes, and did not always repress them. TE-seq also identified examples of gene regulation which depended on different chromatin remodellers. Finally, most meiotic upstream alternative transcripts were rapidly repressed upon return to growth, similar to the NDC80 example. These results provide a basis for understanding how mRNA isoforms and ncRNAs contribute to local gene regulation during development in eukaryotes.
Kähler quantization of vortex moduli
Creators: name: Eriksson, Dennis
name: Romão, Nuno M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We discuss the Kähler quantization of moduli spaces of vortices in line bundles over compact surfaces $Σ$. This furnishes a semiclassical framework for the study of quantum vortex dynamics in the Schrödinger-Chern-Simons model. We follow Deligne's approach to Quillen's metric in determinants of cohomology to construct all the quantum Hilbert spaces in this context. An alternative description of the quantum wavesections, in terms of multiparticle states of spinors on $Σ$ itself (valued in a prequantization of a multiple of its area form), is also obtained. This viewpoint sheds light on the nature of the quantum solitonic particles that emerge from the gauge theory. We find that in some cases (where the area of $Σ$ is small enough in relation to its genus) the dimensions of the quantum Hilbert spaces may be sensitive to the input data required by the quantization scheme, and also address the issue of relating different choices of such data geometrically.
description: 29 pages; v2 with small improvements
The German media debate on taxing animal-based foods: protocol for a qualitative framing analysis
Creators: name: Von Philipsborn, Peter
name: Moerschel, Katharina Selda
name: Fesenfeld, Lukas
name: Leibinger, Anna
name: Hagge, Annika
name: Serong, Julia
name: Hawkins, Benjamin
name: Stiller, Sarah
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Environmental Policy
subject: Public Policy
subject: Public Health
subject: Medicine and Health Sciences
subject: Public Affairs, Public Policy and Public Administration
subject: Health Policy
subject: Social and Behavioral Sciences
subject: climate tax
subject: framing
subject: meat consumption
subject: meat tax
subject: media analysis
subject: nutrition
subject: public health nutrition
subject: sustainability

description: This is the registration of the protocol of a qualitative study that aims to understand how taxes and levies targeting the absolute or relative price of animal-based foods have been framed in German media debates. The study protocol and supplementary material are attached.
Nuclear cluster structure effect on elliptic and triangular flows in heavy-ion collisions
Creators: name: Zhang, S.
name: Ma, Y. G.
name: Chen, J. H.
name: He, W. B.
name: Zhong, C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The initial geometry effect on collective flows, which are inherited from initial projectile structure, is studied in relativistic heavy-ion collisions of $^{12}$C + Au by using a multi-phase transport model (AMPT). Elliptic flow ($v_2$) and triangular flow ($v_3$) which are significantly resulted from the chain and triangle structure of $^{12}\mathrm{C}$ with three-$α$ clusters, respectively, in central $^{12}\mathrm{C}$+$^{197}\mathrm{Au}$ collisions are compared with the flow from the Woods-Saxon distribution of nucleons in $^{12}\mathrm{C}$. $v_3/v_2$ is proposed as a probe to distinguish the pattern of $α$-clustered $^{12}\mathrm{C}$. This study demonstrates that the initial geometry of the collision zone inherited from nuclear structure can be explored by collective flow at the final stage in heavy-ion collisions.
description: 7 pages, 7 figures
Optimization of Velocity Ramps with Survival Analysis for Intersection Merge-Ins
Creators: name: Puphal, Tim
name: Probst, Malte
name: Li, Yiyang
name: Sakamoto, Yosuke
name: Eggert, Julian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We consider the problem of correct motion planning for T-intersection merge-ins of arbitrary geometry and vehicle density. A merge-in support system has to estimate the chances that a gap between two consecutive vehicles can be taken successfully. In contrast to previous models based on heuristic gap size rules, we present an approach which optimizes the integral risk of the situation using parametrized velocity ramps. It accounts for the risks from curves and all involved vehicles (front and rear on all paths) with a so-called survival analysis. For comparison, we also introduce a specially designed extension of the Intelligent Driver Model (IDM) for entering intersections. We show in a quantitative statistical evaluation that the survival method provides advantages in terms of lower absolute risk (i.e., no crash happens) and better risk-utility tradeoff (i.e., making better use of appearing gaps). Furthermore, our approach generalizes to more complex situations with additional risk sources.
description: Intelligent Vehicles Symposium
Radial Trapping of Thermal Rossby Waves within the Convection Zones of Low-Mass Stars
Creators: name: Hindman, Bradley W.
name: Jain, Rekha
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We explore how thermal Rossby waves propagate within the gravitationally stratified atmosphere of a low-mass star with an outer convective envelope. Under the conditions of slow, rotationally constrained dynamics, we derive a local dispersion relation for atmospheric waves in a fully compressible stratified fluid. This dispersion relation describes the zonal and radial propagation of acoustic waves and gravito-inertial waves. Thermal Rossby waves are just one class of prograde-propagating gravito-inertial wave that manifests when the buoyancy frequency is small compared to the rotation rate of the star. From this dispersion relation, we identify the radii at which waves naturally reflect and demonstrate how thermal Rossby waves can be trapped radially in a waveguide that permits free propagation in the longitudinal direction. We explore this trapping further by presenting analytic solutions for thermal Rossby waves within an isentropically stratified atmosphere that models a zone of efficient convective heat transport. We find that within such an atmosphere, waves of short zonal wavelength have a wave cavity that is radially thin and confined within the outer reaches of the convection zone near the star's equator. The same behavior is evinced by the thermal Rossby waves that appear at convective onset in numerical simulations of convection within rotating spheres. Finally, we suggest that stable thermal Rossby waves could exist in the lower portion of the Sun's convection zone, despite that region's unstable stratification. For long wavelengths, the Sun's rotation rate is sufficiently rapid to stabilize convective motions and the resulting overstable convective modes are identical to thermal Rossby waves.
description: 38 pages, 9 figures, accepted for publication in the Astrophysical Journal
title: Embedded Insurance
title: Intensivierung der Kund*innenbindung zum Versicherungsunternehmen durch den Einsatz von Treueprogrammen
titleType: Subtitle
Creators: name: Straßbauer, Julia
Publisher: name: FH CAMPUS 02 (CAMPUS 02 Fachhochschule der Wirtschaft)
Year: 2024
Subjects: subject: 659 Werbung, Öffentlichkeitsarbeit

description: Embedded Insurance bietet sowohl für Drittanbieter*innen, für den Versicherer selbst als auch für Endkund*innen ein Potenzial, welches zum jetzigen Stand noch nicht ausreichend ausgeschöpft ist. Insbesondere die Intensivierung der Kund*innenbindung zum Versicherungsunternehmen bietet seitens der Versicherer Möglichkeiten die Kund*innenbeziehung weiterauszubauen. Im Rahmen der Masterarbeit wird untersucht, ob der Einsatz von Treueprogrammen seitens der Versicherungsunternehmen zur Intensivierung der Kund*innenbindung beitragen. Im Zuge intensiver Recherchen konnte festgestellt werden, welche Bedeutung das Thema Embedded Insurance im Allgemeinen sowie im Bezug auf die Kund*innenbindung einnimmt und welche weitgehende Wichtigkeit für die Zukunft prognostiziert wird. Die Ergebnisse der quantitativen Erhebung bei Besitzer*innen einer Kreditkarte inkl. Versicherungsschutz zeigen, dass die Aspekte Vertrauen, Image und Treueprogramme einen positiven Einfluss auf den Aufbau einer Kund*innenbindung von seitens der Kund*innen zum Versicherungsunternehmen haben.
description: Embedded insurance offers potential for third-party providers, for the insurer itself and for end customers, which has not yet been sufficiently exploited. In particular, the intensification of customer loyalty to the insurance company offers opportunities for insurers to further expand the customer relationship. The master's thesis examines whether the use of loyalty programmes by insurance companies contributes to intensifying customer loyalty. During intensive research, it was possible to determine the importance of the topic of embedded insurance in general as well as in relation to customer loyalty, and what far-reaching importance is predicted for the future. The results of the quantitative survey of credit card holders with insurance cover show that the aspects of trust, image and loyalty programmes have a positive influence on the development of customer loyalty to the insurance company.
Axial Dissipative Dust as a Source of Gravitational Radiation in f(R) Gravity
Creators: name: Sharif, M.
name: Siddiqa, Aisha
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we explore the source of gravitational radiation in the context of $f(R)$ gravity by considering axially symmetric dissipative dust under geodesic condition. We evaluate scalars associated with electric and magnetic parts of the Weyl tensor for both non-spinning (at the center) and spinning (in the surrounding of the center) fluids of the configuration. For this purpose, we use the evolution as well as constraint equations for kinematical quantities and Weyl tensor. Finally, we investigate the existence of gravitational radiation through super-Poynting vector. It is found that the fluid is not gravitationally radiating in the non-spinning case but it is gravitationally radiating for the spinning case.
description: 24 pages, no figure
General Surgery Emergencies: An Anesthetic and Radiological Approach
Creators: name: Jordan Kyle
Publisher: name: Zenodo
Year: 2022

description: This comprehensive study delves into the intricate intersection of general surgery emergencies, anesthesia management, and radiological approaches. Focused on optimizing patient outcomes in critical situations, the study explores the collaborative efforts between anesthesiologists and radiologists in the swift and effective management of emergent surgical cases. By examining specific procedures, diagnostic challenges, and advancements in technology, this research aims to provide valuable insights into the integrated approach required for successful outcomes in general surgery emergencies.
Pair symmetry conversion in driven multiband superconductors
Creators: name: Triola, Christopher
name: Balatsky, Alexander V.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: It was recently shown that odd-frequency superconducting pair amplitudes can be induced in conventional superconductors subjected to a spatially-nonuniform time-dependent drive. It has also been shown that, in the presence of interband scattering, multiband superconductors will possess bulk odd-frequency superconducting pair amplitudes. In this work we build on these previous results to demonstrate that by subjecting a multiband superconductor with interband scattering to a time-dependent drive even-frequency pair amplitudes can be converted to odd-frequency pair amplitudes and vice versa. We will discuss the physical conditions under which these pair symmetry conversions can be achieved and possible experimental signatures of their presence.
description: 14 pages, 5 figures
Limit of solutions for semilinear Hamilton-Jacobi equations with degenerate viscosity
Creators: name: Zhang, Jianlu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 35B40, 37J50, 49L25

description: In the paper we prove the convergence of viscosity solutions $u_λ$ as $λ\rightarrow0_+$ for the parametrized degenerate viscous Hamilton-Jacobi equation \[ H(x,d_x u, λu)=α(x)Δu,\quad α(x)\geq 0,\quad x\in \mathbb T^n \] under suitable convex and monotonic conditions on $H: T^*M\times\mathbb R\rightarrow\mathbb R$. Such a limit can be characterized in terms of stochastic Mather measures associated with the critical equation \[ H(x,d_x u,0)=α(x)Δu. \]
title: Balanced Scorecard & OKRs
title: Ein agiles Kennzahlensystem zur Vertriebssteuerung im Dienstleistungssektor
titleType: Subtitle
Creators: name: Adam, Sebastian
Publisher: name: FH CAMPUS 02 (CAMPUS 02 Fachhochschule der Wirtschaft)
Year: 2024
Subjects: subject: 659 Werbung, Öffentlichkeitsarbeit

description: In einem sich ständig verändernden Umfeld ist es für Unternehmen unerlässlich, die eigenen Leistung zu messen und zu verstehen. KPI-Systeme spielen dabei eine entscheidende Rolle. Um folglich schnell und flexibel auf Veränderungen reagieren zu können, ist der Einsatz agiler Methoden ein wesentlicher Erfolgsfaktor – nicht zuletzt aufgrund der Volatilität und Komplexität des Vertriebs. Ziele und Kennzahlen stärken die Agilität des Vertriebs, vernachlässigen aber die strategische Perspektive eines Kennzahlensystems. Ziel dieser Arbeit ist es, auf Basis von Expert*inneninterviews ein agiles Kennzahlensystem für das Vertriebsmanagement im B2B-Dienstleistungssektor zu entwickeln. In dem entstehenden Modell werden die Perspektiven der Balanced Scorecard mit der OKR-Methode kombiniert, um ein ganzheitliches Performance Measurement System zu entwickeln. Ergänzend dazu werden die erfolgskritischen Leistungsindikatoren von Vertriebsabteilungen im B2B-Dienstleistungssektor berücksichtigt. Die Kombination der beiden Modelle kann wertvolle Perspektiven für Forschung und Managementpraxis liefern.
description: In an ever-changing environment, it is crucial for companies to measure and understand their own performance. Therefore, KPI systems play an important role. Hence, in order to be able to respond quickly and flexibly to change, the use of agile methods is a key factor of success – especially given the volatility and complexity of sales. Objectives and key success factors strengthen the agility of sales but neglect the strategic perspective of a performance measurement system. The aim of this thesis is to develop an agile KPI system for sales management in the B2B service sector based on expert interviews. The resulting model combines Balanced Scorecard perspectives with the OKR method in order to develop a holistic performance measurement system. The model is complemented by the inclusion of performance indicators that are crucial to the success of sales departments in B2B service sectors. The combination of these two models can provide valuable perspectives for research and management practice.
Modeling Approaches for Addressing Simple Unrelaxable Constraints with Unconstrained Optimization Methods
Creators: name: Padidar, Misha
name: Larson, Jeffrey
name: Wild, Stefan M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We explore novel approaches for solving nonlinear optimization problems with unrelaxable bound constraints, which must be satisfied before the objective function can be evaluated. Our method reformulates the unrelaxable bound-constrained problem as an unconstrained optimization problem that is amenable to existing unconstrained optimization methods. The reformulation relies on a domain warping to form a merit function; the choice of the warping determines the level of exactness with which the unconstrained problem can be used to find solutions to the bound-constrained problem, as well as key properties of the unconstrained formulation such as smoothness. We develop theory when the domain warping is a multioutput sigmoidal warping, and we explore the practical elements of applying unconstrained optimization methods to the formulation. We develop an algorithm that exploits the structure of the sigmoidal warping to guarantee that unconstrained optimization algorithms applied to the merit function will find a stationary point to the desired tolerance.
description: 20 pages, 5 figures
MPEC 2023-P60 : 2023 PU
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 PU

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Los daños y su eventual atribución en los casos de error de diagnóstico de VIH : estudio de caso
Creators: name: González Lozano, Shirley Lizeth
Publisher: name: Universidad Externado de Colombia
Year: 2023
Subjects: subject: Medicina - Legislación
subject: Diagnóstico - Estudios de caso
subject: Ética médica - Aspectos jurídicos
subject: Falso positivo
subject: VIH
subject: Error de diagnóstico
subject: Responsabilidad médica

description: Desde sus orígenes, el Virus de Inmunodeficiencia Adquirida (VIH) ha estado permeado de un estigma social que va más allá de lo que pueda generar el diagnóstico de cualquier otra enfermedad y que continua vigente hasta el momento. Es por ello, que en el presente artículo se busca explorar las afectaciones que puede experimentar una persona que es diagnosticada con esta enfermedad y más aún, justificado desde el supuesto de un error de diagnóstico. Lo anterior, para luego entrar a estudiar, más allá de las propias limitaciones de la ciencia médica en las pruebas diagnósticas, en cuales supuestos de hecho y a quienes se les podría atribuir tanto fáctica como jurídicamente este error.
description: Since its origins, the Human Immunodeficiency Virus (HIV) has been permeated by a social stigma that goes beyond what the diagnosis of any other disease can generate and continues to be relevant to this day. That is why this article seeks to explore the impact that a person diagnosed with this disease can experience, especially when justified from the assumption of a misdiagnosis. This is done to then study, beyond the limitations of medical science in diagnostic tests, in which factual and legal circumstances could this error be attributed to and to whom.
Smartphone app to investigate the relationship between social connectivity and mental health
Creators: name: Boonstra, Tjeerd W.
name: Werner-Seidler, Aliza
name: O'Dea, Bridianne
name: Larsen, Mark E.
name: Christensen, Helen
Publisher: name: arXiv
Year: 2017
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Interpersonal relationships are necessary for successful daily functioning and wellbeing. Numerous studies have demonstrated the importance of social connectivity for mental health, both through direct peer-to-peer influence and by the location of individuals within their social network. Passive monitoring using smartphones provides an advanced tool to map social networks based on the proximity between individuals. This study investigates the feasibility of using a smartphone app to measure and assess the relationship between social network metrics and mental health. The app collected Bluetooth and mental health data in 63 participants. Social networks of proximity were estimated from Bluetooth data and 95% of the edges were scanned at least every 30 minutes. The majority of participants found this method of data collection acceptable and reported that they would be likely to participate in future studies using this app. These findings demonstrate the feasibility of using a smartphone app that participants can install on their own phone to investigate the relationship between social connectivity and mental health.
description: 4 pages, 4 figures
Interface engineering and molecular conformation control for solution processed optoelectronic devices
Creators: name: Hamilton, Iain
Publisher: name: Imperial College London
Year: 2018

description: Solution processable semiconductors offer a promising route to flexible, low-cost and scalable optoelectronic devices. Device performance is critically dependent on both the material interfaces present within, as well as active layer molecular conformation. In this thesis, the effects of interface engineering and molecular conformation control are investigated within the context of two contemporary technologies; polymer light emitting diodes (PLEDs) and perovskite solar cells (PSCs). Firstly, the role of the conjugated backbone structure of conjugated polyelectrolytes (CPEs) when used as the electron injection layer in PLEDs is investigated. It is found that the interface between the CPE and light emitting polymer determines the efficiency and luminance turn-on time of the PLED, allowing general molecular design rules of CPEs to be deduced. Additionally, a novel organic-inorganic hybrid composite material comprised of a CPE and zinc oxide (ZnO) nanoparticles is examined as an electron injection material in inverted hybrid PLEDs. By optimising the ratio of the ZnO:CPE, it is found that this material has great potential as a solution processed electron injection layer in inverted hybrid light emitting diodes. Next, a novel approach to achieve deep-blue, high-efficiency PLEDs via a simple molecular level conformation change of an emissive conjugated polymer is discussed. Rigid β-phase segments are introduced into a 95% fluorene-5% arylamine copolymer emissive layer, creating intramolecular type II heterointerfaces. The conformational change alters the nature of the dominant luminescence from a broad, charge transfer like emission to a significantly blue-shifted and highly vibronically structured excitonic emission. As a consequence, a significant improvement in the Commission International de L’Eclairage (x, y) coordinates is observed from (0.149, 0.175) to (0.145, 0.123) while maintaining high efficiency (3.60 cd/A, 2.44 lm/W) and improved stability. This approach is further extended to fluorene-benzothiadiazole copolymers. Finally, the effect of varying the halide composition of mixed halide (bromide-iodide) lead-based perovskite materials on solar cell performance is investigated using a combination of Kelvin probe, air photoemission spectroscopy, surface photovoltage and absorption/emission measurements. It is found that using 25:75 Br:I ratio gives optimum solar cell performance by (i) passivating defect states within the perovskite, (ii) increasing the optical band gap which increases open circuit voltage and (iii) stabilising the perovskite such that no halide phase segregation occurs. Collectively, these works highlight the critical role material interfaces play in the operation of solution processed optoelectronic devices and how, by suitable interface engineering strategies, device performance can be fully optimised.
Current-sheet Oscillations Caused by Kelvin-Helmholtz Instability at the Loop Top of Solar Flares
Creators: name: Wang, Yulei
name: Cheng, Xin
name: Ren, Zining
name: Ding, Mingde
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Current sheets (CSs), long stretching structures of magnetic reconnection above solar flare loops, are usually observed to oscillate, their origins, however, are still puzzled at present. Based on a high-resolution 2.5-dimensional MHD simulation of magnetic reconnection, we explore the formation mechanism of the CS oscillations. We find that large-amplitude transverse waves are excited by the Kelvin-Helmholtz instability (KHI) at the highly turbulent cusp-shaped region. The perturbations propagate upward along the CS with a phase speed close to local Alfvén speed thus resulting in the CS oscillations we observe. Though the perturbations damp after propagating for a long distance, the CS oscillations are still detectable. In terms of detected CS oscillations, with a combination of differential emission measure technique, we propose a new method for measuring the magnetic field strength of the CSs and its distribution in height.
description: Accepted for publication in The Astrophysical Journal Letters
Real-analytic perturbation theory: Arnold diffusion in billiards and homoclinic geodesics on hypersurfaces
Creators: name: Clarke, Andrew Michael
Publisher: name: Imperial College London
Year: 2020

description: In this thesis we study two different, but related, dynamical systems on hypersurfaces of Euclidean space. First, we consider billiard dynamics in a real-analytic, strictly convex domain. In dimension 2, if a billiard trajectory begins with the velocity vector making a positive angle with the boundary, then this angle remains bounded away from zero at each collision due to the existence of a family of invariant curves called caustics. We show that in higher dimensions, trajectories drifting towards the boundary can exist. Namely, using the geometric techniques of Arnold diffusion, we show that in three or more dimensions, assuming the geodesic flow on the boundary of the domain has a hyperbolic periodic orbit and a transverse homoclinic, the existence of trajectories asymptotically approaching the billiard boundary is a generic phenomenon in the real- analytic topology. Secondly, we address the assumptions from the first problem. We show that real-analytic, strictly convex, closed surfaces in 3-dimensional Euclidean space generically have a hyperbolic closed geodesic with a transverse homoclinic. It is also shown that real-analytic, closed hypersurfaces with an elliptic closed geodesic generically have a hyperbolic closed geodesic and a transverse homoclinic geodesic, in arbitrary dimension, and without the assumption of strict convexity. These are among the first perturbation-theoretic results for real-analytic geodesic flows.
Correlates of Programmer Efficacy and Their Link to Experience: A Combined EEG and Eye-Tracking Study
Creators: name: Peitek, Norman
name: Bergum, Annabelle
name: Rekrut, Maurice
name: Mucke, Jonas
name: Nadig, Matthias
name: Parnin, Chris
name: Siegmund, Janet
name: Apel, Sven
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Background: Despite similar education and background, programmers can exhibit vast differences in efficacy. While research has identified some potential factors, such as programming experience and domain knowledge, the effect of these factors on programmers' efficacy is not well understood. Aims: We aim at unraveling the relationship between efficacy (speed and correctness) and measures of programming experience. We further investigate the correlates of programmer efficacy in terms of reading behavior and cognitive load. Method: For this purpose, we conducted a controlled experiment with 37~participants using electroencephalography (EEG) and eye tracking. We asked participants to comprehend up to 32 Java source-code snippets and observed their eye gaze and neural correlates of cognitive load. We analyzed the correlation of participants' efficacy with popular programming experience measures. Results: We found that programmers with high efficacy read source code more targeted and with lower cognitive load. Commonly used experience levels do not predict programmer efficacy well, but self-estimation and indicators of learning eagerness are fairly accurate. Implications: The identified correlates of programmer efficacy can be used for future research and practice (e.g., hiring). Future research should also consider efficacy as a group sampling method, rather than using simple experience measures.
description: 12 pages, 7 figures, To be published at Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE '22)
Two reasons for the appearance of pushed wavefronts in the Belousov-Zhabotinsky system with spatiotemporal interaction
Creators: name: Hasík, Karel
name: Kopfová, Jana
name: Nábělková, Petra
name: Trofymchuk, Olena
name: Trofimchuk, Sergei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 34K12, 35K57, 92D25

description: We prove the existence of the minimal speed of propagation $c_*(r,b,K) \in [2\sqrt{1-r},2]$ for wavefronts in the Belousov-Zhabotinsky system with a spatiotemporal interaction defined by the convolution with (possibly, "fat-tailed") kernel $K$. The model is assumed to be monostable non-degenerate, i.e. $r\in (0,1)$. The slowest wavefront is termed pushed or non-linearly determined if its velocity $c_*(r,b,K) > 2\sqrt{1-r}$. We show that $c_*(r,b,K)$ is close to 2 if i) positive system's parameter $b$ is sufficiently large or ii) if $K$ is spatially asymmetric to one side (e.g. to the left: in such a case, the influence of the right side concentration of the bromide ion on the dynamics is more significant than the influence of the left side). Consequently, this reveals two reasons for the appearance of pushed wavefronts in the Belousov-Zhabotinsky reaction.
description: 22 pages, submitted
Structural investigation of uniform ensembles of self-catalyzed GaAs nanowires fabricated by a lithography-free technique
Creators: name: Koivusalo, Eero
name: Hakkarainen, Teemu
name: Guina, Mircea
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Structural analysis of self-catalyzed GaAs nanowires (NWs) grown on lithography-free oxide patterns is described with insight on their growth kinetics. Statistical analysis of templates and NWs in different phases of the growth reveals extremely high dimensional uniformity due to a combination of uniform nucleation sites, lack of secondary nucleation of NWs, and self-regulated growth under the effect of nucleation antibunching. Consequently, we observed the first evidence of sub-Poissonian GaAs NW length distributions. The high phase purity of the NWs is demonstrated using complementary transmission electron microscopy (TEM) and high-resolution x-ray diffractometry (HR-XRD). It is also shown that, while NWs are to large extent defect-free with up to 2 um long twin-free zincblende segments, low temperature micro-photoluminescence spectroscopy reveals that the proportion of structurally disordered sections can be detected from their spectral properties.
description: 17 pages, 7 figures
title: Teacher Home Visits: Changes in Perceptions of Key Stakeholders
Creators: name: Thomas, Kevin R.
Publisher: name: Utah State University
Year: 2022

description: Teacher home visits have been shown to improve student attendance, academics and to reduce behavior issues. Three groups are involved: the student, the teacher, and the family (or parent). This research focused on determining if and how the teacher home visit changes the perspectives, expectations, and relationships of these three groups. A survey followed by interviews of some of the students, parents, and teachers was used. The surveys and the interviews were evaluated. Results indicated that perceptions and relationships between stakeholders were improved. Due to low participation rates, results must be interpreted with caution. With these considerations in mind, I concluded with a discussion of study implications and future research.
Real equiangular lines in dimension 18 and the Jacobi identity for complementary subgraphs
Creators: name: Greaves, Gary R. W.
name: Syatriadi, Jeven
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We show that the maximum cardinality of an equiangular line system in $\mathbb R^{18}$ is at most $59$. Our proof includes a novel application of the Jacobi identity for complementary subgraphs. In particular, we show that there does not exist a graph whose adjacency matrix has characteristic polynomial $(x-22)(x-2)^{42} (x+6)^{15} (x+8)^2$.
description: 26 pages. Updated to match the published, journal version
Landau levels in QCD
Creators: name: Bruckmann, F.
name: Endrodi, G.
name: Giordano, M.
name: Katz, S. D.
name: Kovacs, T. G.
name: Pittler, F.
name: Wellnhofer, J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present first evidence for the Landau level structure of Dirac eigenmodes in full QCD for nonzero background magnetic fields, based on first principles lattice simulations using staggered quarks. Our approach involves the identification of the lowest Landau level modes in two dimensions, where topological arguments ensure a clear separation of these modes from energetically higher states, and an expansion of the full four-dimensional modes in the basis of these two-dimensional states. We evaluate various fermionic observables including the quark condensate and the spin polarization in this basis to find how much the lowest Landau level contributes to them. The results allow for a deeper insight into the dynamics of quarks and gluons in background magnetic fields and may be directly compared to low-energy models of QCD employing the lowest Landau level approximation.
description: 21 pages, 19 figures