cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The ultra-dense, interacting environment of a dual AGN at z $\sim$ 3.3 revealed by JWST/NIRSpec IFS
Creators: name: Perna, M.
name: Arribas, S.
name: Marshall, M.
name: D'Eugenio, F.
name: Übler, H.
name: Bunker, A.
name: Charlot, S.
name: Carniani, S.
name: Jakobsen, P.
name: Maiolino, R.
name: Del Pino, B. Rodríguez
name: Willott, C. J.
name: Böker, T.
name: Circosta, C.
name: Cresci, G.
name: Curti, M.
name: Husemann, B.
name: Kumari, N.
name: Lamperti, I.
name: Pérez-González, P. G.
name: Scholtz, J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: LBQS 0302-0019 is a blue quasar (QSO) at z ~ 3.3, hosting powerful outflows, and residing in a complex environment consisting of an obscured AGN candidate, and multiple companions, all within 30 kpc in projection. We use JWST NIRSpec IFS observations to characterise the ionized gas in this complex system. We develop a procedure to correct for the spurious oscillations (or 'wiggles') in NIRSpec single-spaxel spectra, due to the spatial under-sampling of the point spread function. We perform a quasar-host decomposition with the QDeblend3D tools, and use multi-component kinematic decomposition of the optical emission line profiles to infer the physical properties of the emitting gas. The quasar-host decomposition allows us to identify i) a low-velocity component possibly tracing a warm rotating disk, with a dynamical mass Mdyn $\sim 10^{11}$ Msun and a rotation-to-random motion ratio $v_{rot}$/$σ_0 \sim 2$; ii) a spatially unresolved ionised outflow, with a velocity of $\sim$ 1000 km/s and an outflow mass rate of $\sim 10^4$ Msun/yr. We also detect eight interacting companion objects close to LBQS 0302-0019. Optical line ratios confirm the presence of a second, obscured AGN at $\sim 20$ kpc of the primary QSO; the dual AGN dominates the ionization state of the gas in the entire NIRSpec field-of-view. This work has unveiled with unprecedented detail the complex environment of this dual AGN, which includes nine interacting companions (five of which were previously unknown), all within 30 kpc of the QSO. Our results support a scenario where mergers can trigger dual AGN, and can be important drivers for rapid early SMBH growth.
description: 23 pages, 23 figures; accepted for publication by A&A
Optimization and implementation of a bimolecular fluorescence complementation (BiFC) system for the detection of plum pox potyviral protein-protein interactions in planta
Creators: name: Zilian, Eva
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2011
Subjects: subject: Plum pox virus (PPV)
subject: protein-protein interactions
subject: bimolecular fluorescence complementation (BiFC)
subject: Protein-Protein Interaktionen
subject: bimolekulare Fluoreszenzkomplementation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Microscopic theory of colour in lutetium hydride
Creators: name: Kim, Sun-Woo
name: Conway, Lewis J.
name: Pickard, Chris J.
name: Pascut, G. Lucian
name: Monserrat, Bartomeu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Nitrogen-doped lutetium hydride has recently been proposed as a near-ambient-conditions superconductor. Interestingly, the sample transforms from blue to pink to red as a function of pressure, but only the pink phase is claimed to be superconducting. Subsequent experimental studies have failed to reproduce the superconductivity, but have observed pressure-driven colour changes including blue, pink, red, violet, and orange. However, discrepancies exist among these experiments regarding the sequence and pressure at which these colour changes occur. Given the claimed relationship between colour and superconductivity, understanding colour changes in nitrogen-doped lutetium hydride may hold the key to clarifying the possible superconductivity in this compound. Here, we present a full microscopic theory of colour in lutetium hydride, revealing that hydrogen-deficient LuH$_2$ is the only phase which exhibits colour changes under pressure consistent with experimental reports, with a sequence blue-violet-pink-red-orange. The concentration of hydrogen vacancies controls the precise sequence and pressure of colour changes, rationalising seemingly contradictory experiments. Nitrogen doping also modifies the colour of LuH$_2$ but it plays a secondary role compared to hydrogen vacancies. Therefore, we propose hydrogen-deficient LuH$_2$ as the key phase for exploring the superconductivity claim in the lutetium-hydrogen system. Finally, we find no phonon-mediated superconductivity near room temperature in the pink phase.
description: 3 figures + Supplementary Information, published version
Organic molecules on wide-gap insulating surfaces from first-principles
Creators: name: Chen, Wei
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2011
Subjects: subject: Adsorption
subject: conjugated organic molecule
subject: wide-gap insulator
subject: electronic excitation
subject: Konjugierte Moleküle
subject: Isolator
subject: elektronische Anregung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
title:   Phase Resolved Partial Discharge Evaluation at dc Voltage
Creators: name: Deznenzo, Tobias
Publisher: name: Technological University Dublin
Year: 2019

description: Partial discharge diagnostics are common for the condition assessment of high voltage alternating current (ac) and direct current (dc) equipment. For ac applications the phase resolved partial discharge evaluation method has prevailed [1]. Even though, numerous methods for dc partial discharge diagnostics have been proposed no agreed standard exists. This is primarily because of the fact that these methods are not as easily applicable as the well-known, intuitive, pattern based phase resolved method. Due to the often assumed unavailability of a useable phase angle information [2]–[4] this method has never been transferred to dc partial discharge diagnostics. However, as a dc voltage is usually not generated but obtained from a rectification process a natural ripple, which provides a phase information, will always be available. Hence, a novel dc partial discharge evaluation method that uses a phase resolved approach is introduced in this thesis. The introduction of a ripple on the dc voltage, which, in this thesis, is obtained from a half-wave rectification, might alter the discharge behaviour. Consequently, the maximum tolerable ripple below which a dc discharge behaviour is maintained has to be evaluated. Such an evaluation has never been carried out for a partially rectified voltage. Hence, for the first time, four characteristic discharge quantities have been evaluated with respect to a varying ripple. The outcome is a maximum tolerable ripple of 3 % for negative corona, 2 % for positive corona, 0.8 % for negative and positive surface discharges as well as 0.4 % for internal discharges. These newly defined values have then been used as a basis to obtain characteristic phase resolved partial discharge patterns at dc voltages. The novel patterns have been explained through the underlying physical phenomena. Therefore, for the first time, this work successfully demonstrated that a phase resolved partial discharge evaluation can be conducted at dc voltages, while the general dc discharge behaviour is maintained. This newly proposed recognition method has the potential to change dc partial discharge diagnostics in practical as well as in laboratory applications.
Quasi-particle functional Renormalisation Group calculations in the two-dimensional t-t'-Hubbard model
Creators: name: Rohe, Daniel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We extend and apply a recently introduced quasi-particle functional renormalisation group scheme to the two-dimensional Hubbard model with next-nearest-neighbour hopping and away from half filling. We confirm the generation of superconducting correlations in some regions of the phase diagram, but also find that the inclusion of self-energy feedback by means of a decreasing quasi-particle weight can suppress superconducting tendencies more than anti-ferromagnetic correlations by which they are generated. As a supplement, we provide sample results for the self-energy in second-order perturbation theory and address some conceptual matters.
Oxidative activation of light hydrocarbons in a perovskite hollow fiber membrane reactor
Creators: name: Czuprat, Oliver
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Membrane reactor
subject: perovskite
subject: hollow fiber
subject: mixed ion electronic conductor
subject: oxygen transporting membrane
subject: oxidative activation
subject: dehydrogenation
subject: oxidative coupling ot methane
subject: CO2
subject: carbonate
subject: Membranreaktor
subject: Perowskit
subject: Hohlfaser
subject: gemischt Ionen- und Elektronenleiter
subject: sauerstofftransportierende Membran
subject: oxidative Aktivierung
subject: Dehydrierung
subject: oxidative Kupplung von Methan
subject: Carbonat
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Thermodynamic signatures for topological phase transitions to Majorana and Weyl superfluids in ultracold Fermi gases
Creators: name: Seo, Kangjun
name: Zhang, Chuanwei
name: Tewari, Sumanta
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We discuss the thermodynamic signatures for the topological phase transitions into Majorana and Weyl superfluid phases in ultracold Fermi gases in two and three dimensions in the presence of Rashba spin-orbit coupling and a Zeeman field. We analyze the thermodynamic properties exhibiting the distinct nature of the topological phase transitions linked with the Majorana fermions (2D Fermi gas) and Weyl fermions (3D Fermi gas) which can be observed experimentally, including pressure, chemical potential, isothermal compressibility, entropy, and specific heat, as a function of the interaction and the Zeeman field at both zero and finite temperatures. We conclude that among the various thermodynamic quantities, the isothermal compressibility and the chemical potential as a function of the artificial Zeeman field have the strongest signatures of the topological transitions in both two and three dimensions.
title: Investigation into Photovoltaic Distributed Generation Penetration in the Low Voltage Distribution Network
Creators: name: Pukhrem, Shivananda
Publisher: name: Technological University Dublin
Year: 2019

description: Significant integration of photovoltaic distributed generation (PVDG) in the low voltage distribution network (LVDN) could potentially pose threats and challenges to the core activity of distribution system operators (DSO), which is to transport electrical energy in a reliable and cost-effective way. The main aim of this research is to investigate the active planning and operation of LVDNs with increased PVDG integration through steady state power system analysis. To address the impacts of voltage profile fluctuation due to power flow modification, this research proposes a probabilistic risk assessment of power quality (PQ) variations and events that may arise due to significant PVDG integration. A Monte Carlo based simulation is applied for the probabilistic risk assessment. This probabilistic approach is used as a tool to assess the likely impacts due to PVDG integration against the extreme-case scenarios. With increased PVDG integration, site overvoltage is a likely impact, whereas voltage unbalance reduces when compared with no or low PVDG penetration cases. This is primarily due to the phase cancellation between the phases. The other aspect of the work highlights the fact that the implementation of existing volumetric charges in conjunction with net-metering can have negative impacts on network operator’s revenue. However, consideration of capacity charges in designing the existing network tariff structure shows incentivising the network operator to perform their core duties under increased integration of PVDG. The site overvoltage issue was also studied and resolved in a novel way, where the active and reactive power of the PVDG inverters at all the PV installed premises were optimally coordinated to increase the PV penetration from 35.7% to 66.7% of the distribution transformer rating. This work further explores how deficiencies in both reactive power control (RPC) and active power control (APC) as separate approaches can be mitigated by suitably combining RPC and APC algorithms. A novel “Q” or “PF” limiter was proposed to restrict frequent switching between the two droop characteristics while ensuring a stabilizing (smoothened) voltage profile in each of the PV installed nodes. This novel approach not only alleviates the voltage fluctuation but also reduces the overall network losses.
Osteogenic differentiation of human mesenchymal stem cells by the design of a natural microenvironment
Creators: name: Kreß, Sonja
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Bone tissue engineering
subject: 3D matrix
subject: dynamic cultivation
subject: bioreactor
subject: fluid flow
subject: Knochen Tissue Engineering
subject: dynamische Kultivierung
subject: Bioreaktor
subject: Scherstress
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Optimization and follow-up of semicoherent searches for continuous gravitational waves
Creators: name: Shaltev, Miroslav
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Continuous gravitational wave detection
subject: follow-up searches
subject: data analysis
subject: Kontinuierliche Gravitationswellen
subject: Nachuntersuchungsmethoden
subject: Daten Auswertung
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Genetic analysis of differentiation of T-helper lymphocytes
Creators: name: Wang, Qixin
name: Li, Menghui
name: Xia, Li Charlie
name: Wen, Ge
name: Zu, Hualong
name: Gao, Mingyi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Dynamical Systems (math.DS)
subject: FOS: Biological sciences
subject: FOS: Mathematics

description: In the human immune system, T-helper cells are able to differentiate into two lymphocyte subsets: Th1 and Th2. The intracellular signaling pathways of differentiation form a dynamic regulation network by secreting distinctive types of cytokines, while differentiation is regulated by two major gene loci: T-bet and GATA-3. We developed a system dynamics model to simulate the differentiation and re-differentiation process of T-helper cells, based on gene expression levels of T-bet and GATA-3 during differentiation of these cells. We arrived at three ultimate states of the model and came to the conclusion that cell differentiation potential exists as long as the system dynamics is at an unstable equilibrium point; the T-helper cells will no longer have the potential of differentiation when the model reaches a stable equilibrium point. In addition, the time lag caused by expression of transcription factors can lead to oscillations in the secretion of cytokines during differentiation.
Optimization of transient protein production by chemically transfected CHO suspension cells
Creators: name: Elshereef, Abdalla Adel Sabry Abdelrazik Mohamed
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2018
Subjects: subject: PEI-transient transfection
subject: GFP-transfection efficiency
subject: viability,
subject: Aufreinigung
subject: CHO-Zelle
subject: Genexpression
subject: Grün fluoreszierendes Protein
subject: Polyethylenimin
subject: Rekombinantes Protein
subject: Transfektion
subject: Transforming Growth Factor beta 1
subject: Zelllinie
subject: PEI-transiente Transfektion
subject: GFP-Transfektionseffizienz
subject: Viabilität
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
Creators: name: Zacharias, Norbert
name: Finch, Charlie
name: Girard, Terry
name: Henden, Arne
name: Bartlett, Jennifer
name: Monet, Dave
name: Zacharias, Marion
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The fourth United States Naval Observatory (USNO) CCD Astrograph Catalog, UCAC4 was released in August 2012 (double-sided DVD and CDS data center Vizier catalog I/322). It is the final release in this series and contains over 113 million objects; over 105 million of them with proper motions. UCAC4 is an updated version of UCAC3 with about the same number of stars also covering all-sky. Bugs were fixed, Schmidt plate survey data were avoided, and precise 5-band photometry were added. Astrograph observations have been supplemented for bright stars by FK6, Hipparcos and Tycho-2 data to compile a UCAC4 star catalog complete to about magnitude R = 16. Epoch 1998 to 2004 positions are obtained from observations with the 20 cm aperture USNO Astrograph's red lens, equipped with a 4k by 4k CCD. Mean positions and proper motions are derived by combining these observations with over 140 ground- and space-based catalogs, including Hipparcos/Tycho and the AC2000.2, as well as unpublished measures of over 5000 plates from other astrographs. For most of the faint stars the first epoch plates from the Southern Proper Motion (SPM) and the Northern Proper Motion (NPM) programs form the basis for proper motions. These data are supplemented by 2MASS near-IR photometry for about 110 million stars and 5-band (B,V,g,r,i) APASS data for over 51 million stars. Thus the published UCAC4, as were UCAC3 and UCAC2, is a compiled catalog with the UCAC observational program being a major component. The positional accuracy of stars in UCAC4 at mean epoch is about 15 to 100 mas per coordinate, depending on magnitude, while the formal errors in proper motions range from about 1 to 10 mas/yr depending on magnitude and observing history. Systematic errors in proper motions are estimated to be about 1 to 4 mas/yr.
description: 14 pages, 25 figures, accepted by AJ
Oxabicyclen aus der [4+3]-Cycloaddition : de novo-Synthese von [beta]-C-Glykosiden und des Lacton-Fragments der (+)-Mevinsäuren
Creators: name: Mentzel, Matthias
Publisher: name: Hannover : Universität Hannover
Year: 2000
Subjects: subject: [4+3]-cycloaddition
subject: (+)-mevinic acids
subject: beta-C-glycosides
subject: Bicyclische Verbindungen
subject: Chemische Synthese
subject: Cycloaddition
subject: De-Novo-Synthese
subject: Glykoside
subject: Lactone
subject: Mevinsäuren
subject: Partialstruktur
subject: Sauerstoffheterocyclen
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
A mechanistic evaluation of the local Bloch wave approximation in graded arrays of vertical barriers
Creators: name: Wilks, Ben
name: Montiel, Fabien
name: Wakes, Sarah
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Wave interaction with graded metamaterials exhibits the phenomenon of rainbow reflection, in which broadband wave signals slow down and separate into their frequency components before being reflected. This phenomenon has been qualitatively understood by describing the wave field in the metamaterial using the local Bloch wave approximation (LBWA), which locally represents the wave field as a superposition of propagating wave solutions in the cognate infinite periodic media (so-called Bloch waves). We evaluate the performance of the LBWA quantitatively in the context of two-dimensional linear water-wave scattering by graded arrays of surface-piercing vertical barriers. To do this, we implement the LBWA numerically so that the Bloch waves in one region of the graded array are coupled to Bloch waves in adjacent regions. This coupling is computed by solving the scattering of Bloch waves across the interface between two semi-infinite arrays of vertical barriers, where the barriers in each semi-infinite array can have different submergence depths. Our results suggest that the LBWA accurately predicts the free surface amplitude across a wide range of frequencies, except those just above the cutoff frequencies associated with each of the vertical barriers in the array. This highlights the importance of decaying Bloch modes above the cutoff in rainbow reflection.
description: 18 pages, 9 figures
Reinforcement Learning Approaches for Traffic Signal Control under Missing Data
Creators: name: Mei, Hao
name: Li, Junxian
name: Shi, Bin
name: Wei, Hua
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The emergence of reinforcement learning (RL) methods in traffic signal control tasks has achieved better performance than conventional rule-based approaches. Most RL approaches require the observation of the environment for the agent to decide which action is optimal for a long-term reward. However, in real-world urban scenarios, missing observation of traffic states may frequently occur due to the lack of sensors, which makes existing RL methods inapplicable on road networks with missing observation. In this work, we aim to control the traffic signals in a real-world setting, where some of the intersections in the road network are not installed with sensors and thus with no direct observations around them. To the best of our knowledge, we are the first to use RL methods to tackle the traffic signal control problem in this real-world setting. Specifically, we propose two solutions: the first one imputes the traffic states to enable adaptive control, and the second one imputes both states and rewards to enable adaptive control and the training of RL agents. Through extensive experiments on both synthetic and real-world road network traffic, we reveal that our method outperforms conventional approaches and performs consistently with different missing rates. We also provide further investigations on how missing data influences the performance of our model.
description: With appendix, Published as a conference paper at IJCAI2023
title: Eine persönliche Erinnerung an Wolfgang Eckart
Creators: name: Schott, Heinz
Publisher: name: MyCoRe Community
Year: 2022
Subjects: subject: Würdigung des verstorbenen Medizinhistorikers Wolfgang U. Eckart (1952-2021)
subject: 000
subject: 900

description: Strategien der Kommunikation von Naturwissen und Medizin: Zeitschriften gelehrter Akademien in der frühen Neuzeit, p. 11
Glass fracture surface energy calculated from crystal structure and bond-energy data
Creators: name: Holzer, Marco
name: Waurischk, Tina
name: George, Janine
name: Maaß, Robert
name: Müller, Ralf
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a novel method to predict the fracture surface energy, γ, of isochemically crystallizing silicate glasses using readily available crystallographic structure data of their crystalline counterpart and tabled diatomic chemical bond energies, D0. The method assumes that γ equals the fracture surface energy of the most likely cleavage plane of the crystal. Calculated values were in excellent agreement with those calculated from glass density, network connectivity and D0 data in earlier work. This finding demonstrates a remarkable equivalence between crystal cleavage planes and glass fracture surfaces.
The SHER-HIAF Ring Lattice Design
Creators: name: Gao, X.
name: Yang, J. C.
name: Xia, J. W.
name: Chai, W. P.
name: Shi, J.
name: Shen, G. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Super Heavy Experimental Ring (SHER) is one of the rings of the next accelerator complex High Intensity Heavy Ion Accelerator Facility (HIAF) at IMP[4]. Here, present ideas of the lattice design for the operation of the large acceptance ring are presented. The SHER ring has to be optimized for e-cooling and the lattice is designed for different modes. First of all, it is designed in the so called isochronous mode as time-of-flight mass spectrometer for short-lived secondary nuclei. Secondly, SHER can also be used to be a storage ring for collecting and cooling the secondary rare isotope beams from the transport line. In order to fulfil it's purpose, the ion optics can be set to different ion optical modes.
Parametric amplification in spinor Bose-Einstein condensates
Creators: name: Gebreyesus Hagoss, Gebremedhn
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Spinor Bose-Einstein condensation
subject: parametric amplification
subject: vacuum fluctuations
subject: Spinor Bose-Einstein Kondensation
subject: parametrische Verstärkung
subject: Vakuumfluktuationen
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Parks and open space areas management in Saudi Arabia cities
Creators: name: Alsolaiman, Mohammed Mosa
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2011
Subjects: subject: Park management
subject: Saudi Arabia parks
subject: parks and green open space policies
subject: Parkmanagement
subject: Parks in Saudi-Arabien
subject: Freiraumplanung
subject: Dewey Decimal Classification::700 | Künste, Bildende Kunst allgemein::710 | Landschaftsgestaltung, Raumplanung

description: [no abstract]
title: Heat Pumping Technologies Magazine no 3/2019 Cooling for the Future
Creators: name: Heat Pumping Technologies
Publisher: name: Heat Pump Center
Year: 2019

description: Heat Pumping Technologies Magazine no 3/2019
Cooling for the Future
Heat pumps – the mere term implies that the technology is used for heating. And heating has been in focus for the Heat Pumping Technologies TCP over the years. But this is slowly changing. As ever more people can afford installations for cooling, there is a rising need for novel cooling technologies world-wide, preferably without refrigerants with high climate impact. Therefore, the topic for this issue of HPT Magazine is “Cooling for the Future”. We hope that this will be of interest to even more than the present HPT member countries!
Spectral Energy Distributions of HII regions in M33 (HerM33es)
Creators: name: Relano, M.
name: Verley, S.
name: Perez, I.
name: Kramer, C.
name: Calzetti, D.
name: Xilouris, E. M.
name: Boquien, M.
name: Abreu-Vicente, J.
name: Combes, F.
name: Israel, F.
name: Tabatabaei, F. S.
name: Braine, J.
name: Buchbender, C.
name: Gonzalez, M.
name: Gratier, P.
name: Lord, S.
name: Mookerjea, B.
name: Quintana-Lacaci, G.
name: van der Werf, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Within the framework of the Herschel M 33 extended survey HerM33es we study the Spectral Energy Distribution (SED) of a set of HII regions in M 33 as a function of the morphology. We present a catalogue of 119 HII regions morphologically classified: 9 filled, 47 mixed, 36 shell, and 27 clear shell HII regions. For each object we extract the photometry at twelve available wavelength bands (from FUV-1516A to IR-250mi) and obtain the SED. We also obtain emission line profiles across the regions to study the location of the stellar, ionised gas, and dust components. We find trends for the SEDs related to the morphology, showing that the star and gas-dust configuration affects the ratios of the emission in different bands. The mixed and filled regions show higher emission at 24mi than the shells and clear shells, which could be due to the proximity of the dust to the stellar clusters in the case of mixed and filled regions. The FIR peak for shells and clear shells seems to be located towards longer wavelengths, indicating that the dust is colder for this type of objects.The logarithmic 100/70mi ratio for filled and mixed regions remains constant over one order of magnitude in Halpha and FUV surface brightness, while the shells and clear shells exhibit a wider range of values of almost two orders of magnitude. We derive dust masses and temperatures fitting the individual SEDs with dust models proposed in the literature. The derived dust mass range is between 10^2-10^4 Msun and the cold dust temperature spans T(cold)~12-27 K. The spherical geometrical model proposed for the Halpha clear shells is confirmed by the emission profile obtained from the observations and is used to infer the electron density within the envelope: the typical electron density is 0.7+-0.3 cm^-3, while filled regions can reach values two to five times higher.
description: 21 pages, 19 figures. Accepted to A&A
Patient-specific finite element modeling of bones from X-ray images based on computer-tomography databases
Creators: name: Jamshidi, Ehsan
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: Patient-specific 3D finite element model
subject: statistical shape models
subject: 3D reconstruction
subject: calibration phantom
subject: Patient-spezifisches 3D-Finite-Elemente Modell
subject: statistische Modelle
subject: 3D-Rekonstruktion
subject: Kalibrierphantom
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::624 | Ingenieurbau und Umwelttechnik

description: [no abstract]
Pressure phase diagram and quantum criticality of CePt2In7 single crystals
Creators: name: Sidorov, V. A.
name: Lu, Xin
name: Park, T.
name: Lee, Hanoh
name: Tobash, P. H.
name: Baumbach, R. E.
name: Ronning, F.
name: Bauer, E. D.
name: Thompson, J. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report the temperature-pressure (T-P) phase diagram of CePt2In7 single crystals, especially the pressure evolution of the antiferromagnetic order and the emergence of superconductivity, which have been studied by electrical resistivity and ac calorimetry under nearly hydrostatic environments. Compared with its polycrystalline counterpart, bulk superconductivity coexists with antiferromagnetism in a much narrower pressure region. The possible existence of textured superconductivity and local quantum criticality also are observed in CePt2In7, exhibiting a remarkable similarity with CeRhIn5.
description: Accepted for publication as a Rapid Communication in PRB
Permanent deactivation of boron-oxygen-related recombination centres in crystalline silicon
Creators: name: Walter, Dominic Christof
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: Boron-oxygen-related defect centres
subject: deactivation
subject: carrier lifetime
subject: Bor-Sauerstoff-korrelierte Defektzentren
subject: Deaktivierung
subject: Ladungsträgerlebensdauer
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Petrological, mineralogical and geochemical investigations of late Mesozoic magmatism in Eastern China : implications for tectonic evolution and crust-mantle interaction
Creators: name: Zhang, Chao
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Subduction
subject: delamination
subject: magmatic process
subject: Subduktion
subject: magmatische Prozesse
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: [no abstract]
Patatin-related phospholipases (pPLA) and other cytosolic components in auxin binding protein1 (ABP1)-mediated auxin signaling are revealed by using early auxin-induced gene expression as a biotest in Arabidopsis thaliana
Creators: name: Labusch, Corinna
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Auxin-signaltransduction
subject: phospholipases
subject: ABP1
subject: Auxin-Signaltransduktion
subject: Phospholipasen
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Gateways to the Ocean: A Symposium Celebrating Arnold Gordon's Contributions to Physical Oceanography
Creators: name: Abernathey, Ryan Patrick
name: Huber, Bruce A.
name: Sprintall, Janet
name: Visbeck, Martin
Publisher: name: Columbia University
Year: 2020
Subjects: subject: Oceanography
subject: FOS: Earth and related environmental sciences
subject: Ocean circulation

description: The global ocean circulation affects our climate in myriad ways and plays a central role in mediating the planet’s response to climate change. A key aspect of this circulation is the importance of specific localized gateways (or choke points) which control the strength, structure and basin connectivity of the circulation. Examples of such gateways are the Indonesian Throughflow, the Agulhas retroflection, and outflows from the Ross and Weddell Seas to name a few. These systems often consist of multiple strong jets that vary over a range of space and time scales and so remain extremely challenging to observe, model and predict. Given the rapid development of new observing technologies, and the emergence of a new class of high-resolution global ocean models that are critical for understanding the accelerating rate of climate change, the time is ripe to assess the state of knowledge in the field of ocean gateways and define key challenges for future research. A two-day symposium to bring together distinguished and early-career researchers from across the world, including observationalists, theoreticians and modelers to address these topics was convened at Scripps Institution of Oceanography in San Diego, 13-14 February, the week prior to the 2020 AGU Ocean Science meeting. The symposium coincided with the 80th birthday of Prof. Arnold L. Gordon, a pioneer in the field of ocean gateways. Professor Gordon’s singular research career, spanning over 50 years, has transformed our understanding of ocean gateways and their role in climate. The conveners and attendees celebrated Prof. Gordon’s contributions over the two-day symposium, held in John Martin House, an intimate forum on the SIO campus that fostered interaction and lively discussion among attendees. Attendance was limited to about 50 participants per day, in keeping with the occupancy limit of the venue. In an effort to cultivate the next generation of leaders in the field of ocean gateways, invitations were extended to early career researchers and members of underrepresented groups in addition to well-established researchers in the field. The symposium presentations are archived here as pdf files, organized by session. An introduction, including the two-day agenda, is included in the Session_01 compilation of files. Symposium Organizing Committee: Ryan Abernathey, Bruce Huber (Lamont-Doherty Earth Observatory/Columbia University) Janet Sprintall (Scripps Institution of Oceanography) Martin Visbeck (GEOMAR Helmholtz Centre for Ocean Research Kiel) The symposium was funded by the US National Science Foundation, grant number OCE 2006148.
Ab-initio study of short-range ordering in vanadium-based disordered rocksalt structures
Creators: name: Jadidi, Zinab
name: Yang, Julia H.
name: Chen, Tina
name: Barroso-Luque, Luis
name: Ceder, Gerbrand
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Disordered rocksalt Li-excess (DRX) compounds are attractive new cathode materials for Li-ion batteries as they contain resource-abundant metals and do not require the use of cobalt or nickel. Understanding the delithiation process and cation short-range ordering (SRO) in DRX compounds is essential to improving these promising cathode materials. Herein, we use first-principles calculations along with the cluster-expansion approach to model the disorder in DRX Li2-xVO3, 0 < x < 1. We discuss the SRO of Li in tetrahedral and octahedral sites, and the order in which Li delithiates and V oxidizes with respect to local environments. We reveal that the number of nearest-neighbor V dictates the order of delithiation from octahedral sites and that V are oxidized in a manner that minimizes the electrostatic interactions among V. Our results provide valuable insight for tailoring the performance of V-based DRX cathode materials in general by controlling the SRO features that reduce energy density.
Quantum Eigenvector Continuation for Chemistry Applications
Creators: name: Mejuto-Zaera, Carlos
name: Kemper, Alexander F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A typical task for classical and quantum computing in chemistry is finding a potential energy surface (PES) along a reaction coordinate, which involves solving the quantum chemistry problem for many points along the reaction path. Developing algorithms to accomplish this task on quantum computers has been an active area of development, yet finding all the relevant eigenstates along the reaction coordinate remains a difficult problem, and determining PESs is thus a costly proposal. In this paper, we demonstrate the use of a eigenvector continuation -- a subspace expansion that uses a few eigenstates as a basis -- as a tool for rapidly exploring potential energy surfaces. We apply this to determining the binding PES or torsion PES for several molecules of varying complexity. In all cases, we show that the PES can be captured using relatively few basis states; suggesting that a significant amount of (quantum) computational effort can be saved by making use of already calculated ground states in this manner.
description: 13 pages, 8 figures, 3 pages of appendix
Starobinsky-Type B-L Higgs Inflation Leading Beyond MSSM
Creators: name: Pallis, C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Models of induced-gravity inflation are formulated within Supergravity employing as inflaton the Higgs field which leads to a spontaneous breaking of a U(1)_{B-L} symmetry at Mgut=2x10^16 GeV. We use a renormalizable superpotential, fixed by a U(1) R symmetry, and logarithmic or semi-logarithmic Kahler potentials with integer prefactors which exhibit a quadratic non-minimal coupling to gravity. We find inflationary solutions of Starobinsky type in accordance with the observations. The inflaton mass is predicted to be of the order of 10^13 GeV. The model can be nicely linked to MSSM offering an explanation of the magnitude of the mu parameter consistently with phenomenological data. Also it allows for baryogenesis via non-thermal leptogenesis, provided that the gravitino is heavier than about 10 TeV.
description: Prepared for the Proceedings of the Corfu Summer Institute 2022 -- Conference: C22-08-28. arXiv admin note: substantial text overlap with arXiv:1804.07038
Secrecy Sum-Rates with Regularized Channel Inversion Precoding under Imperfect CSI at the Transmitter
Creators: name: Geraci, Giovanni
name: Couillet, Romain
name: Yuan, Jinhong
name: Debbah, Merouane
name: Collings, Iain B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we study the performance of regularized channel inversion precoding in MISO broadcast channels with confidential messages under imperfect channel state information at the transmitter (CSIT). We obtain an approximation for the achievable secrecy sum-rate which is almost surely exact as the number of transmit antennas and the number of users grow to infinity in a fixed ratio. Simulations prove this anaylsis accurate even for finite-size systems. For FDD systems, we determine how the CSIT error must scale with the SNR, and we derive the number of feedback bits required to ensure a constant high-SNR rate gap to the case with perfect CSIT. For TDD systems, we study the optimum amount of channel training that maximizes the high-SNR secrecy sum-rate.
description: IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), May 2013. arXiv admin note: text overlap with arXiv:1304.5850
Performance analysis and coverage optimization methods for a digital radio system in the VHF bands
Creators: name: Maier, Friederike
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Digital broadcasting
subject: digital radio mondiale
subject: DRM+
subject: OFDM
subject: transmit diversity
subject: receiver diversity
subject: single frequency network
subject: Sender-Diversität
subject: Empfänger-Diversität
subject: Gleichwellennetz
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: [no abstract]
title: “The program has literally changed my life”: Erfahrungen ehemaliger Studierender des internationalen Masterprogramms Digital Communication Leadership (DCLead)
Creators: name: Hagn, Marie-Kathrin
name: Melnik, Emil
name: Neubauer, Dominik
name: Schachner, Sarah
name: Wilczek, Luisa
Publisher: name: University of Salzburg
Year: 2019

description: Das Digital Communication Leadership (DCLead) ist ein interdisziplinäres und internationales Masterprogramm am Fachbereich Kommunikationswissenschaft der Universität Salzburg. Die Kombination aus Theorie und Praxis stärkt die Beschäftigungsaussichten der Studierenden und ermöglicht diesen zukünftig als Führungskräfte tätig zu sein. Der vorliegende Beitrag reflektiert die Erfahrungen von neun ehemaligen Programmteilnehmerinnen und Programmteilnehmern. Die befragten Personen berichten über ihre Motivation, ihre Karriereplanung,ihre aktuelle Arbeitssituationsowie über allgemeine Erfahrungen, die sie im Rahmen des Studiums gemacht haben. Es zeigt sich, dass das DCLead-Programm die Erwartungen der Studierenden zum Großteil erfüllt hat und die Teilnehmerinnen und Teilnehmer es erneut absolvieren würden.
Tuning up the performance of GaAs-based solar cells by inelastic scattering on quantum dots and doping of AlyGa1-ySb type-II dots and AlxGa1-xAs spacers between dots
Creators: name: Kechiantz, A.
name: Afanasev, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We used AlGaSb/AlGaAs material system for a theoretical study of photovoltaic performance of the proposed GaAs-based solar cell in which the type-II quantum dot (QDs) absorber is spatially separated from the depletion region. Due to inelastic scattering of photoelectrons on QDs and proper doping of both QDs and their spacers, concentrated sunlight is predicted to quench recombination through QDs. Our calculation shows that 500-sun concentration can increase the Shockley-Queisser limit from 35% to 40% for GaAs single-junction solar cells.
description: 8 pages, 7 figures; Contributed paper to SPIE Photonics West, San Francisco, CA, USA, February 2013
Interaction-driven topological phase diagram of twisted bilayer MoTe$_2$
Creators: name: Qiu, Wen-Xuan
name: Li, Bohao
name: Luo, Xun-Jiang
name: Wu, Fengcheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Twisted bilayer MoTe$_2$ is a promising platform to investigate the interplay between band topology and many-body interaction. We present a theoretical study of its interaction-driven quantum phase diagrams based on a three-orbital model, which can be viewed as a generalization of the Kane-Mele-Hubbard model with one additional orbital and long-range Coulomb repulsion. We predict a cascade of phase transitions tuned by the twist angle $θ$. At the hole filling factor $ν=1$ (one hole per moiré unit cell), the ground state can be in the multiferroic phase with coexisting spontaneous layer polarization and magnetism, the quantum anomalous Hall phase, and finally the topologically trivial magnetic phases, as $θ$ increases from $1.5^{\circ}$ to $5^{\circ}$. At $ν=2$, the ground state can have a second-order phase transition between an antiferromagnetic phase and the quantum spin Hall phase as $θ$ passes through a critical value. The dependence of the phase boundaries on model parameters such as the gate-to-sample distance, the dielectric constant, and the moiré potential amplitude is examined. The predicted phase diagrams can guide the search for topological phases in twisted transition metal dichalcogenide homobilayers.
description: 16 pages, 13 figures
E-field measurement of pulse line ion accelerator
Creators: name: Wang, Bo
name: Zeng, Rong
name: Niu, Ben
name: Shen, Xiaoli
name: Shen, Xiaokang
name: Cao, Shuchun
name: Zhang, Zimin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The E-field of pulse line ion accelerator (PLIA) is unique with high frequency (~MHz), large magnitude (~MV/m) and limited measuring space (~cm). The integrated optical E-field sensor (IOES) has remarkable advantages and has been used for PLIA E-field measurement. Firstly, the transfer function of IOES has been calibrated to ensure the measurement accuracy. And the time-domain response illustrates that the sensor has a fast dynamic performance to effectively follow a 4 ns rising edge. Then, the E-field distribution along the axis and near the insulator surface of PLIA was measured, showing that the propagation of E-field is almost lossless and E-field near the insulation surface is about 1.1 times larger than that along the axis, which is in accordance with the simulation result.
description: 10 pages,9 figures
Traffic data reconstruction based on Markov random field modeling
Creators: name: Kataoka, Shun
name: Yasuda, Muneki
name: Furtlehner, Cyril
name: Tanaka, Kazuyuki
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (stat.ML)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We consider the traffic data reconstruction problem. Suppose we have the traffic data of an entire city that are incomplete because some road data are unobserved. The problem is to reconstruct the unobserved parts of the data. In this paper, we propose a new method to reconstruct incomplete traffic data collected from various traffic sensors. Our approach is based on Markov random field modeling of road traffic. The reconstruction is achieved by using mean-field method and a machine learning method. We numerically verify the performance of our method using realistic simulated traffic data for the real road network of Sendai, Japan.
description: 12 pages, 4 figures