cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Diffusive Radiation in One-dimensional Langmuir Turbulence
Creators: name: Fleishman, Gregory D.
name: Toptygin, Igor N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We calculate spectra of radiation produced by a relativistic particle in the presence of one-dimensional Langmuir turbulence which might be generated by a streaming instability in the plasma, in particular, in the shock front or at the shock-shock interactions. The shape of the radiation spectra is shown to depend sensitively on the angle between the particle velocity and electric field direction. The radiation spectrum in the case of exactly transverse particle motion is degenerate and similar to that of spatially uniform Langmuir oscillations. In case of oblique propagation, the spectrum is more complex, it consists of a number of power-law regions and may contain a distinct high-frequency spectral peak. %at $ω=2ω\pe γ^2$. The emission process considered is relevant to various laboratory plasma settings and for astrophysical objects as gamma-ray bursts and collimated jets.
description: 4 pages, 1 figure, accepted for Phys. Rev. E
Theory of induced quadrupolar order in tetragonal YbRu_{2}Ge_{2}
Creators: name: Takimoto, Tetsuya
name: Thalmeier, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The tetragonal compound YbRu$_{2}$Ge$_{2}$ exhibits a non-magnetic transition at $T_0$=10.2K and a magnetic transition at $T_1$=6.5K in zero magnetic field. We present a model for this material based on a quasi-quartet of Yb$^{3+}$ crystalline electric field (CEF) states and discuss its mean field solution. Taking into account the broadening of the specific heat jump at $T_0$ for magnetic field perpendicular to [001] and the decrease of $T_0$ with magnetic field parallel to [001], it is shown that ferro-quadrupole order of either O$_{2}^{2}$ or O$_{\rm xy}$ - type are prime candidates for the non-magnetic transition. Considering the matrix element of these quadrupole moments, we show that the lower CEF states of the level scheme consist of a $Γ_{6}$ and a $Γ_{7}$ doublet. This leads to induced type of O$_{2}^{2}$ and O$_{\rm xy}$ quadrupolar order parameters. The quadrupolar order introduces exchange anisotropy for planar magnetic moments. This causes a spin flop transition at low fields perpendicular [001] which explains the observed metamagnetism. We also obtain a good explanation for the temperature dependence of magnetic susceptibility and specific heat for fields both parallel and perpendicular to the [001] direction.
description: 13 pages, 6 figures, and 5 tables. published in PRB
Monte Carlo generators for top quark physics at the LHC
Creators: name: Acharya, Bobby S.
name: Cavallari, Francesca
name: Corcella, Gennaro
name: Di Sipio, Riccardo
name: Petrucciani, Giovanni
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review the main features of Monte Carlo generators for top quark phenomenology and present some results for t-tbar and single-top signals and backgrounds at the LHC.
description: 7 pages, 5 figures. Talk given at `V Workshop Italiano sulla Fisica pp a LHC', Perugia, Italy, 30 January - 2 February 2008. References updated
Two-photon transitions in hydrogen and cosmological recombination
Creators: name: Chluba, J.
name: Sunyaev, R. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the two-photon process for the transitions ns --> 1s and nd --> 1s in hydrogen up to large n. For n<=20 we provide simple analytic fitting formulae to describe the non-resonant part of the two-photon emission profiles. Combining these with the analytic form of the cascade-term yields a simple and accurate description of the full two-photon decay spectrum, which only involves a sum over a few intermediate states. We demonstrate that the cascade term naturally leads to a nearly Lorentzian shape of the two-photon profiles in the vicinity of the resonances. However, due to quantum-electrodynamical corrections, the two-photon emission spectra deviate significantly from the Lorentzian shape in the very distant wings of the resonances. We investigate up to which distance the two-photon profiles are close to a Lorentzian and discuss the role of the interference term. We then analyze how the deviation of the two-photon profiles from the Lorentzian shape affects the dynamics of cosmological hydrogen recombination. Since in this context the escape of photons from the Lyman-alpha resonance plays a crucial role, we concentrate on the two-photon corrections in the vicinity of the Lyman-alpha line. Our computations show that the changes in the ionization history due to the additional two-photon process from high shell (n>2) likely do not reach the percent-level. For conservative assumptions we find a correction DN_e/N_e~-0.4% at redshift z~1160. This is numerically similar to the result of another recent study; however, the physics leading to this conclusion is rather different. In particular, our calculations of the effective two-photon decay rates yield significantly different values, where the destructive interference of the resonant and non-resonant terms plays a crucial role in this context (abridged)
description: 20 pages, 13 figures, 4 tables, accepted version
Discovery of the propargyl radical (CH2CCH) in TMC-1: one of the most abundant radicals ever found and a key species for cyclization to benzene in cold dark clouds
Creators: name: Agundez, M.
name: Cabezas, C.
name: Tercero, B.
name: Marcelino, N.
name: Gallego, J. D.
name: de Vicente, P.
name: Cernicharo, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first identification in interstellar space of the propargyl radical (CH2CCH). This species was observed in the cold dark cloud TMC-1 using the Yebes 40m telescope. The six strongest hyperfine components of the 2,0,2-1,0,1 rotational transition, lying at 37.46~GHz, were detected with signal-to-noise ratios in the range 4.6-12.3 sigma. We derive a column density of 8.7e13 cm-2 for CH2CCH, which translates to a fractional abundance relative to H2 of 8.7e-9. This radical has a similar abundance to methyl acetylene, with an abundance ratio CH2CCH/CH3CCH close to one. The propargyl radical is thus one of the most abundant radicals detected in TMC-1, and it is probably the most abundant organic radical with a certain chemical complexity ever found in a cold dark cloud. We constructed a gas-phase chemical model and find calculated abundances that agree with, or fall two orders of magnitude below, the observed value depending on the poorly constrained low-temperature reactivity of CH2CCH with neutral atoms. According to the chemical model, the propargyl radical is essentially formed by the C + C2H4 reaction and by the dissociative recombination of C3Hn+ ions with n = 4-6. The propargyl radical is believed to control the synthesis of the first aromatic ring in combustion processes, and it probably plays a key role in the synthesis of large organic molecules and cyclization processes to benzene in cold dark clouds.
description: Accepted for publication in A&A Letters
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Creators: name: 李, 特
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 310201
subject: Bioinformatic methods development

description: The Muscovy duck is a poultry for its cost-effective breeding and significant economic importance. It has undergone a systematic process of artificial domestication and natural selection, resulting in the emergence of distinct characteristics among different lines of Muscovy duck. Our comparative genomic analysis, encompassing ROH, HBD, and selective sweep in the Crimo and Fujian populations, provides valuable insights for the breeding of Muscovy ducks in the Fujian population. This study contributes to the understanding of the genetic basis among different Muscovy duck lines, providing knowledge for their breeding and genetic improvement.
Global lopsided instability in a purely stellar galactic disc
Creators: name: Saha, K.
name: Combes, F.
name: Jog, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is shown that pure exponential discs in spiral galaxies are capable of supporting slowly varying discrete global lopsided modes, which can explain the observed features of lopsidedness in the stellar discs. Using linearized fluid dynamical equations with the softened self-gravity and pressure of the perturbation as the collective effect, we derive self-consistently a quadratic eigenvalue equation for the lopsided perturbation in the galactic disc. On solving this, we find that the ground-state mode shows the observed characteristics of the lopsidedness in a galactic disc, namely the fractional Fourier amplitude A$_1$ increases smoothly with the radius. These lopsided patterns precess in the disc with a very slow pattern speed with no preferred sense of precession. We show that the lopsided modes in the stellar disc are long-lived because of a substantial reduction ($\sim$ a factor of 10 compared to the local free precession rate) in the differential precession. The numerical solution of the equations shows that the ground-state lopsided modes are either very slowly precessing stationary normal mode oscillations of the disc or growing modes with a slow growth rate depending on the relative importance of the collective effect of the self-gravity. N-body simulations are performed to test the spontaneous growth of lopsidedness in a pure stellar disc. Both approaches are then compared and interpreted in terms of long-lived global $m=1$ instabilities, with almost zero pattern speed.
description: 15 pages, 23 figures, accepted in MNRAS
Gaussian limits for generalized spacings
Creators: name: Baryshnikov, Yu.
name: Penrose, Mathew D.
name: Yukich, J. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60F05, 60D05, 62H11 (Primary)

description: Nearest neighbor cells in $R^d,d\in\mathbb{N}$, are used to define coefficients of divergence ($ϕ$-divergences) between continuous multivariate samples. For large sample sizes, such distances are shown to be asymptotically normal with a variance depending on the underlying point density. In $d=1$, this extends classical central limit theory for sum functions of spacings. The general results yield central limit theorems for logarithmic $k$-spacings, information gain, log-likelihood ratios and the number of pairs of sample points within a fixed distance of each other.
description: Published in at http://dx.doi.org/10.1214/08-AAP537 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Revised Best Estimates for the Age and Mass of the Methuselah Star HD 140283 using MESA and Interferometry and Implications for 1D Convection
Creators: name: Tang, J.
name: Joyce, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In light of recently revised observational measurements of the radius and spectroscopic parameters of the extremely old and metal-poor Gaia benchmark star HD 140283 -- also known as the Methuselah star due to prior suggestions that its age is in tension with the age of the Universe -- we present new, best estimates for the star's mass and age from stellar modeling. These are derived using 1D stellar evolutionary tracks computed with MESA and the most up-to-date measurements from CHARA interferometry. Excluding modeling variance from the uncertainties, we report a mass of $0.809 \pm 0.001 M_{\odot}$ and an age of $12.01 \pm 0.05$ Gyr ($1 σ$). When dominant sources of modeling uncertainty are taken into account, we report $0.81 \pm 0.05 M_{\odot}$ and $12 \pm 0.5$ Gyr, respectively. These results are consistent with recent literature, and the best-fitting age is not in conflict with the currently accepted age of the universe ($13.5$ Gyr; arXiv:1303.5089 [astro-ph.CO]).
Glucagon-like peptide-1 (GLP-1) receptor activation dilates cerebral arterioles, increases cerebral blood flow, and mediates remote (pre)conditioning neuroprotection against ischaemic stroke.
Creators: name: Nizari, Shereen
name: Basalay, Marina
name: Chapman, Philippa
name: Korte, Nils
name: Korsak, Alla
name: Christie, Isabel N
name: Theparambil, Shefeeq M
name: Davidson, Sean M
name: Reimann, Frank
name: Trapp, Stefan
name: Yellon, Derek M
name: Gourine, Alexander V
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021

description: Stroke remains one of the most common causes of death and disability worldwide. Several preclinical studies demonstrated that the brain can be effectively protected against ischaemic stroke by two seemingly distinct treatments: remote ischaemic conditioning (RIC), involving cycles of ischaemia/reperfusion applied to a peripheral organ or tissue, or by systemic administration of glucagon-like-peptide-1 (GLP-1) receptor (GLP-1R) agonists. The mechanisms underlying RIC- and GLP-1-induced neuroprotection are not completely understood. In this study, we tested the hypothesis that GLP-1 mediates neuroprotection induced by RIC and investigated the effect of GLP-1R activation on cerebral blood vessels, as a potential mechanism of GLP-1-induced protection against ischaemic stroke. A rat model of ischaemic stroke (90 min of middle cerebral artery occlusion followed by 24-h reperfusion) was used. RIC was induced by 4 cycles of 5 min left hind limb ischaemia interleaved with 5-min reperfusion periods. RIC markedly (by ~ 80%) reduced the cerebral infarct size and improved the neurological score. The neuroprotection established by RIC was abolished by systemic blockade of GLP-1R with a specific antagonist Exendin(9-39). In the cerebral cortex of GLP-1R reporter mice, ~ 70% of cortical arterioles displayed GLP-1R expression. In acute brain slices of the rat cerebral cortex, activation of GLP-1R with an agonist Exendin-4 had a strong dilatory effect on cortical arterioles and effectively reversed arteriolar constrictions induced by metabolite lactate or oxygen and glucose deprivation, as an ex vivo model of ischaemic stroke. In anaesthetised rats, Exendin-4 induced lasting increases in brain tissue PO2, indicative of increased cerebral blood flow. These results demonstrate that neuroprotection against ischaemic stroke established by remote ischaemic conditioning is mediated by a mechanism involving GLP-1R signalling. Potent dilatory effect of GLP-1R activation on cortical arterioles suggests that the neuroprotection in this model is mediated via modulation of cerebral blood flow and improved brain perfusion.
Rankin-Cohen brackets of eigenforms and modular forms
Creators: name: Beyerl, Jeffrey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F11, 11F25

description: We use Maeda's Conjecture to prove that the Rankin-Cohen bracket of an eigenform and any modular form is only an eigenform when forced to be because of the dimensions of the underlying spaces. We further determine when the Rankin-Cohen bracket of an eigenform and modular form is not forced to produce an eigenform and when it is determined by the injectivity of the operator itself. This can also be interpreted as using the Rankin-Cohen bracket operator of eigenforms to create evidence for Maeda's Conjecture.
title: Rapport de voyage, Angkor (1899) : Ligne de Méditerranée circulaire Sud Nord, 1932, voyage n°17
Creators: name: Angelvin, César
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2023
Subjects: subject: Compagnie des Messageries Maritimes
subject: Transports maritimes - Histoire
subject: Marine marchande
subject: Journaux de bord

description: Chapitrage : Rapport du commandant - Rapport de mer
description: Source: French Lines & Compagnies, 1997 002 3939-13
description: Coverage: 1932-04-06/1932-04-30
Combination therapy with PD-1 blockade and radiofrequency ablation for recurrent hepatocellular carcinoma: a propensity score matching analysis
Creators: name: Wang, Xiaofei
name: Liu, Guo
name: Chen, Shu
name: Bi, Huaqiang
name: Xia, Feng
name: Feng, Kai
name: Ma, Kuansheng
name: Ni, Bing
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy

description: This study aimed to evaluate whether combined therapy with PD-1 blockade (anti-PD-1) and radiofrequency ablation (RFA) is superior to RFA monotherapy for recurrent hepatocellular carcinoma (HCC). A total of 127 patients who underwent anti-PD-1 plus RFA treatment (n = 41) or RFA alone (n = 86) for recurrent HCC were included in this retrospective study. A matched cohort comprising 40 patients from each group was selected after propensity score matching analysis. Clinical data including post-RFA HCC recurrence (primary endpoint), overall survival (OS) (secondary endpoint), adverse events, and toxic effects were retrospectively analyzed. The 1-year recurrence-free survival rates for the anti-PD-1 plus RFA and RFA groups were 32.5% and 10.0% after propensity score matching. There were statistically significant differences between the two groups in terms of the recurrence-free survival rate (p = 0.001) and OS rate (p = 0.016). Tumor number, tumor-node metastasis (TNM) stage, antiviral therapy, and anti-PD-1 treatment were demonstrated to be important factors associated with 1-year recurrence-free survival probability by univariate and multivariate analyses. Univariate and multivariate analyses demonstrated that tumor number, TNM stage and anti-PD-1 treatment were significant prognostic factors for OS. RFA treatment-related adverse events included pleural effusions that require drainage and a mild or moderate increase in body temperature. Grade 3 or higher events related to anti-PD-1 treatment occurred in 12.8% (6) of patients and were infrequent. Combination therapy with anti-PD-1 plus RFA was superior to RFA alone in improving survival in patients with recurrent HCC.
Quantum study of reaction O(3P) + H2(v,j) $\rightarrow$ OH + H: OH formation in strongly UV-irradiated gas
Creators: name: Veselinova, A.
name: Agundez, M.
name: Goicoechea, J. R.
name: Menendez, M.
name: Zanchet, A.
name: Verdasco, E.
name: Jambrina, P. G.
name: Aoiz, F. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The reaction between atomic oxygen and molecular hydrogen is an important one in astrochemistry as it regulates the abundance of the hydroxyl radical and serves to open the chemistry of oxygen in diverse astronomical environments. However, the existence of a high activation barrier in the reaction with ground state oxygen atoms limits its efficiency in cold gas. In this study we calculate the dependence of the reaction rate coefficient on the rotational and vibrational state of H$_2$ and evaluate the impact on the abundance of OH in interstellar regions strongly irradiated by far-UV photons, where H2 can be efficiently pumped to excited vibrational states. We use a recently calculated potential energy surface and carry out time-independent quantum mechanical scattering calculations to compute rate coefficients for the reaction O(3P) + H2(v,j) -> OH + H, with H2 in vibrational states v = 0-7 and rotational states j = 0-10. We find that the reaction becomes significantly faster with increasing vibrational quantum number of H2, although even for high vibrational states of H2 (v = 4-5) for which the reaction is barrierless, the rate coefficient does not strictly attain the collision limit and still maintains a positive dependence with temperature. We implemented the calculated state-specific rate coefficients in the Meudon PDR code to model the Orion Bar PDR and evaluate the impact on the abundance of the OH radical. We find the fractional abundance of OH is enhanced by up to one order of magnitude in regions of the cloud corresponding to Av = 1.3-2.3, compared to the use of a thermal rate coefficient for O + H2, although the impact on the column density of OH is modest, of about 60 %. The calculated rate coefficients will be useful to model and interpret JWST observations of OH in strongly UV-illuminated environments.
description: Accepted for publication in A&A
Developing a model Fracture Liaison Service consultation with patients, carers and clinicians: a Delphi survey to inform content of the iFraP complex consultation intervention.
Creators: name: Bullock, Laurna
name: Crawford-Manning, Fay
name: Cottrell, Elizabeth
name: Fleming, Jane
name: Leyland, Sarah
name: Edwards, John
name: Clark, Emma M
name: Thomas, Simon
name: Chapman, Stephen
name: Gidlow, Christopher
name: Iglesias, Cynthia P
name: Protheroe, Joanne
name: Horne, Robert
name: O'Neill, Terence W
name: Mallen, Christian
name: Jinks, Clare
name: Paskins, Zoe
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Humans
Osteoporosis
Caregivers
Referral and Consultation
Secondary Prevention
Osteoporotic Fractures

description: Fracture Liaison Services are recommended to deliver best practice in secondary fracture prevention. This modified Delphi survey, as part of the iFraP (Improving uptake of Fracture Prevention drug Treatments) study, provides consensus regarding tasks for clinicians in a model Fracture Liaison Service consultation. PURPOSE: The clinical consultation is of pivotal importance in addressing barriers to treatment adherence. The aim of this study was to agree to the content of the 'model Fracture Liaison Service (FLS) consultation' within the iFraP (Improving uptake of Fracture Prevention drug Treatments) study. METHODS: A Delphi survey was co-designed with patients and clinical stakeholders using an evidence synthesis of current guidelines and content from frameworks and theories of shared decision-making, communication and medicine adherence. Patients with osteoporosis and/or fragility fractures, their carers, FLS clinicians and osteoporosis specialists were sent three rounds of the Delphi survey. Participants were presented with potential consultation content and asked to rate their perception of the importance of each statement on a 5-point Likert scale and to suggest new statements (Round 1). Lowest rated statements were removed or amended after Rounds 1 and 2. In Round 3, participants were asked whether each statement was 'essential' and percentage agreement calculated; the study team subsequently determined the threshold for essential content. RESULTS: Seventy-two, 49 and 52 patients, carers and clinicians responded to Rounds 1, 2 and 3 respectively. One hundred twenty-two statements were considered. By Round 3, consensus was reached, with 81 statements deemed essential within FLS consultations, relating to greeting/introductions; gathering information; considering therapeutic options; eliciting patient perceptions; establishing shared decision-making preferences; sharing information about osteoporosis and treatments; checking understanding/summarising; and signposting next steps. CONCLUSIONS: This Delphi consensus exercise has summarised for the first time patient/carer and clinician consensus regarding clearly defined tasks for clinicians in a model FLS consultation.
Lattice structures of Larkin-Ovchinnikov-Fulde - Ferrell (LOFF) state
Creators: name: Jiang, Longhua
name: Ye, Jinwu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Starting from the Ginzburg-Landau free energy describing the normal state to Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) state transition, we evaluate the free energy of seven most common lattice structures such as stripe, square, triangular,Simple Cubic (SC), Face centered Cubic (FCC),Body centered Cubic (BCC) and Quasi-crystal (QC). We find that the stripe phase which is the original LO state, is the most stable phase. This result maybe relevant to the detection of LOFF state in some heavy fermion compounds and the pairing lattice structure of fermions with unequal populations in the BCS side of Feshbach resonance in ultra-cold atoms.
description: 8 pages, 10 figures
The Diary of a Disabled PhD Student: Sharing Lived Experience of Chronic Illness and Disability using Digital Media and Journalism
Creators: name: Astra Aldwinckle, Emma
Publisher: name: University of Leicester
Year: 2025

description: Introduction This practice-based PhD explores the lived experiences of chronic illness and disability, considering intersections with class, gender, and age through digital media and journalism. A Diary examines the challenges of completing a PhD with disabilities, offering insights into navigating higher education.Aims The research employs autoethnography to examine how intersectionality – particularly class, gender, disability, and comorbidities – affects PhD students. It also investigates how creative practice can help individuals from working-class backgrounds with disabilities pursue higher education and gain recognition in the media industry.Methods The researcher maintained an online Facebook ‘Diary of a Disabled PhD Student’, hosted on a research website (www.linktr.ee/disabledphdstudent), which is integrated into the thesis through critical reflection chapters.Results The study highlights the value of digital media and journalism in fostering disability inclusion, demonstrating how creative writing, and digital platforms can enhance engagement among diverse audiences and create contributions to research dissemination.Impact Despite limitations, the research illustrates the positive role of digital media and journalism in raising awareness of disability and chronic illness, increasing visibility, and amplifying marginalised voices.Future Directions The project offers creative extracts to guide future researchers, showcasing how digital platforms can document and share lived experiences in academic settings.Conclusion This research underscores the value of combining autoethnography, digital media, and journalism to promote disability awareness. It calls for diversifying the PhD thesis language and layouts (structure) to enhance inclusivity in higher education. The research offers new knowledge contributions regarding ‘graphy’ and the holistic factors affecting PhD completion for individuals with disabilities, emphasising the need for diverse representation.
Search for the Rare Decay K_{L}\toπ^{0}π^{0}γ
Creators: name: KTeV Collaboration
name: Abouzaid, E.
name: Arenton, M.
name: Barker, A. R.
name: Bellantoni, L.
name: Blucher, E.
name: Bock, G. J.
name: Cheu, E.
name: Coleman, R.
name: Corcoran, M. D.
name: Corti, G.
name: Cox, B.
name: Erwin, A. R.
name: Escobar, C. O.
name: Glazov, A.
name: Golossanov, A.
name: Gomes, R. A.
name: Gouffon, P.
name: Hsiung, Y. B.
name: Jensen, D. A.
name: Kessler, R.
name: Kotera, K.
name: Ledovskoy, A.
name: McBride, P. L.
name: Monnier, E.
name: Nguyen, H.
name: Niclasen, R.
name: Phillips, D. G.
name: Ping, H.
name: Ramberg, E. J.
name: Ray, R. E.
name: Ronquest, M.
name: Santos, E.
name: Shields, J.
name: Slater, W.
name: Smith, D.
name: Solomey, N.
name: Swallow, E. C.
name: Toale, P. A.
name: Tschirhart, R.
name: Velissaris, C.
name: Wah, Y. W.
name: Wang, J.
name: White, H. B.
name: Whitmore, J.
name: Wilking, M.
name: Winston, R.
name: Worcester, E. T.
name: Worcester, M.
name: Yamanaka, T.
name: Zimmerman, E. D.
name: Zukanovich, R. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The KTeV E799 experiment has conducted a search for the rare decay $K_{L}\toπ^{0}π^{0}γ$ via the topology $K_{L}\toπ^{0}π^{0}_Dγ$ (where $π^0_D\toγe^+e^-$). Due to Bose statistics of the $π^0$ pair and the real nature of the photon, the $K_{L}\toπ^{0}π^{0}γ$ decay is restricted to proceed at lowest order by the CP conserving direct emission (DE) of an E2 electric quadrupole photon. The rate of this decay is interesting theoretically since chiral perturbation theory predicts that this process vanishes at level $O(p^4)$. Therefore, this mode probes chiral perturbation theory at $O(p^6)$. In this paper we report a determination of an upper limit of $2.43\times 10^{-7}$ (90% CL) for $K_{L}\toπ^{0}π^{0}γ$. This is approximately a factor of 20 lower than previous results.
description: six pages and six figures in the submission. Reformatted for Physics Review D
title: Über thermisch bedingte Einflüsse bei Transitbeobachtungen im Meridian
Creators: name: Dittrich, Johannes
Publisher: name: Zentralinstitut für Physik der Erde
Year: 1976

description: Mikroklimatische Einflüsse, insbesondere Einflüsse des Temperaturfeldes in der unmittelbaren Umgebung des Transitinstrumentes, bewirken die Ausbildung von Refraktionsanomalien und thermisch bedingten instrumentellen Fehlern. Das Temperaturfeld im Meridianhaus wird durch dessen Lage und Anlage weitgehend bestimmt. Sonnenscheindauer bzw. Bewölkung und der Beobachter sind für den momentanen Zustand des Temperaturfeldes verantwortlich. Wind und Luftfeuchte wirken verstärkend oder ausgleichend. Eine Objektivierung der Beobachtung ist nur sinnvoll, wenn gleichzeitig die Verminderung bzw. Erfassung dieser Einflüsse gelingt. Dabei erscheint die Berechnung von Korrektionen auf Grund der Regressionsgleichung effektiver als die Berechnung von Refraktionsanomalien und thermisch bedingten Änderungen der Kollimation. Ziel der Entwicklung ist die Automatisierung der Transitbeobachtungen.
description: Veröffentlichungen des Zentralinstituts für Physik der Erde; 36; ISSN 05148790
title: Sternkatalog für das Potsdamer PZT
Creators: name: Meinig, Manfred
Publisher: name: Zentralinstitut für Physik der Erde
Year: 1976

description: Der Potsdamer PZT-Katalog enthält Sterne bis zur Helligkeit 9,m5 aus dem AGK3. Die PZT-Beobachtungen von 1972 und 1973 wurden verwendet, um die Sternörter zu verbessern. Die Berechnung der Korrektionen erfolgte in zwei Schritten: 1. Reduktion unvollständig beobachteter Gruppen auf das Gruppenzentrum und Ableitung von Korrektionen aus den Restfehlern in den Gruppen, 2. Ermittlung von Gruppenkorrektionen nach dem Prinzip der Kettenmethode. Die systematischen Differenzen zwischen dem PZT-Katalog und dem AGK3 werden dargestellt. - Unter Verwendung der korrigierten Deklinationen und weiterer 5 Kataloge, die zu verschiedenen Epochen seit 1915 beobachtet wurden, sind die Eigenbewegungskomponenten in Deklination für die PZT-Sterne neu berechnet worden.
description: Veröffentlichungen des Zentralinstituts für Physik der Erde; 37; ISSN 05148790
Low Stress Ion Conductance Microscopy of Sub-Cellular Stiffness
Creators: name: Clarke, Richard W.
name: Novak, Pavel
name: Zhukov, Alexander
name: Tyler, Eleanor J.
name: Cano-Jaimez, Marife
name: Drews, Anna
name: Richards, Owen
name: Volynski, Kirill
name: Bishop, Cleo
name: Klenerman, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Directly examining subcellular mechanics whilst avoiding excessive strain of a live cell requires the precise control of light stress on very small areas, which is fundamentally difficult. Here we use a glass nanopipet out of contact with the plasma membrane to both exert the stress on the cell and also accurately monitor cellular compression. This allows the mapping of cell stiffness at a lateral resolution finer than 100 nm. We calculate the stress a nanopipet exerts on a cell as the sum of the intrinsic pressure between the tip face and the plasma membrane plus its direct pressure on any glycocalyx, both evaluated from the gap size in terms of the ion current decrease. A survey of cell types confirms that an intracellular pressure of approximately 120 Pa begins to detach the plasma membrane from the cytoskeleton and reveals that the first 660 +/- 90 nm of compression of a neuron cell body is much softer than previous methods have been able to detect.
title: Die nachträgliche Orientierung von Bohrkernen unter besonderer Berücksichtigung des Paläomagnetismus
Creators: name: Menning, Manfred
Publisher: name: Zentralinstitut für Physik der Erde
Year: 1976

description: Bohrkerne sind nachträglich zu orientieren mit Hilfe der Schichtneigungsmessung (Stratalog), der Bohrlochabweichung, der Reflexionsseismik, mittels des Schnitteffekts am Bohrkern sowie besonders erfolgreich paläomagnetisch. Bohrkerne werden paläomagnetisch orientiert, indem man die Vektorkomponente der charakteristischen Remanenz im Bohrkern bestimmt, die bei der Genese der charakteristischen Remanenz in der Horizontalen lag. Diese Vektorkomponente wird in Richtung des anhand von Literaturangaben berechneten Paläomeridians ausgerichtet. Trotz der Feldinversionen, der Säkularvariation, viskoser Remanenzen (VRM) und der Bohrlochabweichung können in permischen, karbonischen und devonischen Sedimentiten der Mitteleuropäischen Senke Streichen und Fallen sowie Schüttungsrichtungen bestimmt oder Klüfte mit einem mittleren Fehler von ±10° bis +20° orientiert werden.
description: Veröffentlichungen des Zentralinstituts für Physik der Erde; 39; ISSN 05148790
Chemical similarities between Galactic bulge and local thick disk red giant stars
Creators: name: Melendez, J.
name: Asplund, M.
name: Alves-Brito, A.
name: Cunha, K.
name: Barbuy, B.
name: Bessell, M. S.
name: Chiappini, C.
name: Freeman, K. C.
name: Ramirez, I.
name: Smith, V. V.
name: Yong, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The evolution of the Milky Way bulge and its relationship with the other Galactic populations is still poorly understood. The bulge has been suggested to be either a merger-driven classical bulge or the product of a dynamical instability of the inner disk. To probe the star formation history, the initial mass function and stellar nucleosynthesis of the bulge, we performed an elemental abundance analysis of bulge red giant stars. We also completed an identical study of local thin disk, thick disk and halo giants to establish the chemical differences and similarities between the various populations. High-resolution infrared spectra of 19 bulge giants and 49 comparison giants in the solar neighborhood were acquired with Gemini/Phoenix. All stars have similar stellar parameters but cover a broad range in metallicity. A standard 1D local thermodynamic equilibrium analysis yielded the abundances of C, N, O and Fe. A homogeneous and differential analysis of the bulge, halo, thin disk and thick disk stars ensured that systematic errors were minimized. We confirm the well-established differences for [O/Fe] (at a given metallicity) between the local thin and thick disks. For the elements investigated, we find no chemical distinction between the bulge and the local thick disk, which is in contrast to previous studies relying on literature values for disk dwarf stars in the solar neighborhood. Our findings suggest that the bulge and local thick disk experienced similar, but not necessarily shared, chemical evolution histories. We argue that their formation timescales, star formation rates and initial mass functions were similar.
description: Accepted for publication in A&A, 5 pages
title: Auswertung der Zeitbestimmungen des geodätisch astronomischen Observatoriums Potsdam als Längenbestimmungen im System BIH 1968 und daraus erhaltene erste Untersuchungsergebnisse
Creators: name: Höpfner, Joachim
Publisher: name: Zentralinstitut für Physik der Erde
Year: 1976

description: Für das geodätisch-astronomische Observatorium Potsdam wurden die astronomischen Zeitbestimmungen von 1957.5 bis 1973.0 als Längenbestimmungen im homogenen System BIH 1968 ausgewertet. Ausgangsdaten waren die auf das sowjetische Zeitsystem Etalonnoe Vremja (°EV) bezogenen Restabweichungen U* - U der beobachteten, wegen des Einflusses der Polbewegung korrigierten Universalzeiten. Zuerst waren deren Vorzeichen umzukehren und dann für bestimmte Zeitabschnitte verschiedene Korrektionen anzubringen, und zwar für das Zeitsystem °EV wegen Übergangs zum System BIH 1968 und für die Universalzeiten wegen Übergangs zum FK4-System, Änderung der jährlichen Aberrationskonstanten, Übergangs zum CIO-System und außerdem wegen Verschiedenheit der Lotabweichungen. Aus den so erhaltenen Längenkorrektionen ergaben sich die Längenwerte durch Addition des konventionellen Längenwertes. Diese wurden gemeinsam und getrennt für Passageinstrument- und Astrolab- Beobachtungen auf Genauigkeit, systematische Veränderung, insbesondere mit Jahres- und Halbjahresperiode, und systematische Verschiedenheit nach Registriersystemen untersucht. Die Untersuchungsergebnisse lassen sich wie folgt zusammenfassen:
	Bei den Längenwerten für Astrolab-Beobachtungen trat eine systematische Abweichung auf.
	Nachweislich existieren von Periode zu Periode sich ändernde systematische Anteile in den Längenwerten, auch nach Angleichung der Astrolab-Längenwerte.
	Die Längenwerte für Astrolab-Beobachtungen variieren mit Jahresperiode.
	Mindestens zwei der Registriersystemmittel der astronomischen Länge unterscheiden sich jeweils statistisch gesichert voneinander.
description: Veröffentlichungen des Zentralinstituts für Physik der Erde; 45; ISSN 05148790
title: Zeit- und Breitenbestimmungen mit dem photografischen Zenitteleskop des Zentralinstituts für Physik der Erde
Creators: name: Meinig, Manfred
name: Jochmann, Horst
Publisher: name: Zentralinstitut für Physik der Erde
Year: 1976

description: Seit 1972 werden in Potsdam regelmäßig Beobachtungen mit dem PZT durchgeführt. Das Konstruktionsprinzip und die Arbeitsweise des Instruments werden erläutert. Aus den grundlegenden Beziehungen zwischen Bildkoordinaten, Sternörten und Stationskoordinaten werden die Abbildungsgleichungen entwickelt und daraus die Grundformeln für die Auswertung abgeleitet. Der Einfluß von Azimut- und Umlegefehler auf die Zeit- und Breitenbestimmung wird fehlertheoretisch untersucht. Für die Reduktion der Beobachtungen werden seit 1974 Sternörter verwendet, die auf Grund der Resultate von 1972 und 1973 verbessert wurden. In einer Genauigkeitsanalyse werden die Einflüsse verschiedener Fehlerquellen untersucht und die Leistungsfähigkeit des Instruments abgeschätzt. Die erhaltenen zufälligen Fehler der Zeit-· und Breitenbestimmungen werden mit den theoretisch zu erwartenden Werten verglichen. Die Ergebnisse für die Jahre 1972 bis 1974 sind im Anhang zusammengestellt.
description: Veröffentlichungen des Zentralinstituts für Physik der Erde; 49; ISSN 05148790
Solar Grain Drying Progress and Potential
Creators: name: Foster, George H.
name: Peart, Robert M.
name: Foster, George H.
name: Peart, Robert M.
Publisher: name: Unknown
Year: 1976
Subjects: subject: Crop Production/Industries
subject: Research Methods/ Statistical Methods
subject: Resource /Energy Economics and Policy
subject: Grain drying
subject: solar energy
subject: low-temperature drying
subject: heat storage
subject: supplemental solar heat
subject: high-temperature drying
subject: solar collectors
subject: radiant energy
subject: computer simulation

description: Drying grain, especially corn, with conventional artificial drying methods requires great quantities of petroleum fuel during a short harvest period. Two systems of drying are used: high-speed, high-temperature batch or continuous-flow and low temperature in-storage drying. Solar energy was studied as an alternative or supplemental energy source for low-temperature drying at several different Midwest locations. Adoption of solar grain drying depends on supply and price of petroleum fuel and on competition for scarce fuel for other agricultural uses such as powering field operations and manufacturing fertilizer.
Higgs Boson Mass From Gauge-Higgs Unification
Creators: name: Gogoladze, Ilia
name: Okada, Nobuchika
name: Shafi, Qaisar
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In certain five dimensional gauge theories the Standard Model Higgs doublet is identified, after compactification on the orbifold S^1/Z_2, with the zero mode of the fifth component of the gauge field. An effective potential for the Higgs field is generated via quantum corrections, triggered by the breaking of the underlying gauge symmetry through boundary conditions. The quartic Higgs coupling can be estimated at low energies by employing the boundary condition that it vanishes at the compactification scale Λ, as required by five dimensional gauge invariance. For Λ\gtrsim 10^{13}-10^{14} GeV, the Standard Model Higgs boson mass is found to be m_H = 125 \pm 4 GeV corresponding to a top quark pole mass M_t = 170.9 \pm 1.8 GeV. A more complete (gauge-Higgs-Yukawa) unification can be realized for Λ~ 10^8 GeV, which happens to be the scale at which the SU(2) weak coupling and the top quark Yukawa coupling have the same value. For this case, m_H = 117\pm 4 GeV.
description: 9 pages, 2 figures, typos corrected, references added
title: Bibliographie 1890 -1969 der Mitarbeiter des Geomagnetischen Instituts Potsdam
Creators: name: Frölich, F.
name: Lengning, K.
Publisher: name: Zentralinstitut für Physik der Erde
Year: 1977

description: Die Veröffentlichungen der Mitarbeiter des Geomagnetischen Instituts sind in dieser Bibliographie für die Jahre 1890 - 1969 chronologisch zusammengestellt.
"Geomagnetisches Institut" war der letzte Name dieser Forschungseinrichtung. Die
früheren Institutsbezeichnungen waren:
von 1890 bis 1936 	Magnetische Abteilung des Meteorologischen Observatoriums bei Potsdam des Preußischen Meteorologischen Instituts Berlin;
von 1936 bis 1945 	Geophysikalisches Institut Potsdam der Universität Berlin;
von 194-5 bis 1949 	Geophysikalisches Institut Potsdam des MHD der DDR;
von 1949 bis 1957 	Geomagnetisches Institut und Observatorium Potsdam – Niemegk des MHD der DDR;
von 1957 bis 1969 	Geomagnetisches Institut Potsdam der DAdW zu Berlin.
Fortlaufend werden ab 1890 die magnetischen Jahrbücher veröffentlicht, in denen die geomagnetischen Beobachtungsergebnisse der Observatorien Potsdam (1890 - 1907) und Seddin (1908 - 1931) und ab 1932 des Adolf-Schmidt-Observatoriums für Erdmagnetismus in Niemegk zusammengestellt sind. Sie sind erschienen als:
Veröffentlichungen des Preußischen Meteorologischen Instituts Berlin (1890 - 1935),
Veröffentlichungen des Geophysikalischen Instituts Potsdam (1936 - 1945),
Veröffentlichungen des Meteorologischen und Hydrologischen Dienstes der DDR (1946 - 1956).
Veröffentlichungen des Geomagnetischen Instituts Potsdam der Deutschen Akademie der Wissenschaften zu Berlin (1957 - 1969).
In der Bibliographie sind auch Veröffentlichungen enthalten, die Mitarbeiter vor ihrer Zugehörigkeit zum Institut bzw. nach Eintritt in den Ruhestand publiziert haben. Weiter sind auch Arbeiten von Doktoranden und Diplomanden, die am Institut als Gäste tätig waren, in dieser Aufstellung verzeichnet. Die Namen der Autoren, die nicht Mitarbeiter des Instituts waren, sind in Klammern gesetzt.
Für diese Zusammenstellung wurden in erster Linie die Tätigkeitsberichte des Preußischen Meteorologischen Instituts und die Tätigkeitsberichte in den Erdmagnetischen Jahrbüchern des Adolf-Schmidt-Observatoriums in Niemegk benutzt. Kurze Mitteilungen (z.B. Literaturbesprechungen) sind nicht berücksichtigt.
Die Veröffentlichungen der Mitarbeiter des Geomagnetischen Instituts sind in der Bibliographie nach ihrem Erscheinungsjahr und nach Autoren alphabetisch geordnet und jeweils für ein Jahr laufend durchnumeriert.
Das alphabetische Autorenregister soll die Auffindung einzelner Publikationen erleichtern. Hier sind sämtliche Autoren aufgeführt, die in der Bibliographie verzeichnet sind.
description: Veröffentlichungen des Zentralinstituts für Physik der Erde; 38; ISSN 05148790
Experimental Consequences of the S-wave $\cos(k_x) \cdot \cos(k_y)$ Superconductivity in the Iron-Pnictides
Creators: name: Parish, Meera M.
name: Hu, Jiangping
name: Bernevig, B. Andrei
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The experimental consequences of different order parameters in iron-based superconductors are theoretically analyzed. We consider both nodeless and nodal order parameters, with an emphasis on the $\cos(k_x)\cdot \cos(k_y)$ nodeless order parameter recently derived by two of us. We analyze the effect of this order parameter on the spectral function, density of states, tunneling differential conductance, penetration depth, and the NMR spin relaxation time. This extended s-wave symmetry has line-zeroes in between the electron and hole pockets, but they do not intersect the two Fermi surfaces for moderate doping, and the superconductor is fully gapped. However, this suggests several quantitative tests: the exponential decay of the penetration depth weakens and the density of states reveals a smaller gap upon electron or hole doping. Moreover, the $\cos(k_x) \cdot \cos(k_y)$ superconducting gap is largest on the smallest (hole) Fermi surface. For the $1/T_1$ NMR spin relaxation rate, the inter-band contribution is consistent with the current experimental results, including a (non-universal) $T^{3}$ behavior and the absence of a coherence peak. However, the intra-band contribution is considerably larger than the inter-band contributions and still exhibits a small enhancement in the NMR spin relaxation rate right below $T_c$ in the clean limit.
description: 10 pages, 10 figures
SuMa++: Efficient LiDAR-based Semantic SLAM
Creators: name: Chen, Xieyuanli
name: Milioto, Andres
name: Palazzolo, Emanuele
name: Giguère, Philippe
name: Behley, Jens
name: Stachniss, Cyrill
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Reliable and accurate localization and mapping are key components of most autonomous systems. Besides geometric information about the mapped environment, the semantics plays an important role to enable intelligent navigation behaviors. In most realistic environments, this task is particularly complicated due to dynamics caused by moving objects, which can corrupt the mapping step or derail localization. In this paper, we propose an extension of a recently published surfel-based mapping approach exploiting three-dimensional laser range scans by integrating semantic information to facilitate the mapping process. The semantic information is efficiently extracted by a fully convolutional neural network and rendered on a spherical projection of the laser range data. This computed semantic segmentation results in point-wise labels for the whole scan, allowing us to build a semantically-enriched map with labeled surfels. This semantic map enables us to reliably filter moving objects, but also improve the projective scan matching via semantic constraints. Our experimental evaluation on challenging highways sequences from KITTI dataset with very few static structures and a large amount of moving cars shows the advantage of our semantic SLAM approach in comparison to a purely geometric, state-of-the-art approach.
description: Accepted by IROS 2019. Code: https://github.com/PRBonn/semantic_suma