cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quasi-Normal Modes of Stars and Black Holes
Creators: name: Kokkotas, Kostas D.
name: Schmidt, Bernd G.
Publisher: name: arXiv
Year: 1999
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Perturbations of stars and black holes have been one of the main topics of relativistic astrophysics for the last few decades. They are of particular importance today, because of their relevance to gravitational wave astronomy. In this review we present the theory of quasi-normal modes of compact objects from both the mathematical and astrophysical points of view. The discussion includes perturbations of black holes (Schwarzschild, Reissner-Nordström, Kerr and Kerr-Newman) and relativistic stars (non-rotating and slowly-rotating). The properties of the various families of quasi-normal modes are described, and numerical techniques for calculating quasi-normal modes reviewed. The successes, as well as the limits, of perturbation theory are presented, and its role in the emerging era of numerical relativity and supercomputers is discussed.
description: 74 pages, 7 figures, Review article for "Living Reviews in Relativity"
Coordination chemistry of a fused triazolopyrazine ligand favoring structural anion···π interactions
Creators: name: King, Andi D.
name: Woodfine, Sian E.
name: Hawes, Chris S.
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences

description: The fused heterocyclic ligand 1,2,4-triazolo[4,3-a]pyrazine (L1) is a rigid heterocyclic building block capable of pyrazolate-like coordination modes while retaining neutral electronic character. Here, we examine the coordination chemistry of this species for the first time. While the ligand proved unstable under solvothermal conditions, using mild synthetic conditions we have isolated three new coordination polymers, poly-[Zn(µ2-L1)Cl2] (1), poly-[Ag2(µ3-L1)2(µ2-C3H6O)](BF4)2·C3H6O (2) and poly-[Cu2(µ3-L1)2(µ2-L1)](X-)2 (X- = NO3, 3a; PF6, 3b). Both doubly and triply bridging coordination modes are observed in these species, and close anion···π interactions with the electron deficient ligand backbone are observed in all three complexes as dominant structural features. Although N2 and CO2 adsorption experiments shows the linear solvent channels in complex 3b are not accessible to guests after evacuation, retention of crystallinity on drying and air exposure indicates robust bonding in this species comparable to related fused azolate anions.
title: Determining the Uptake and Possible Assimilation of the Plant Component of Spartina Detritus by Palaemonetes Pugio Using a Rapid Radiolabeling Method
Creators: name: Crosby, Michael Peter
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 1982

description: Assimilation of the plant components of Spartina alterniflora detritus by the grass shrimp, Palaemonetes pugio, was investigated in a laboratory feeding study. A new radiolabeling procedure was utilized to label the sterilized detritus with 14C. Organic carbon values were calculated for both S. alterniflora and P. pugio. The grass shrimp were found to assimilate significantly the detritus, with an assimilation efficiency of approximately 14%, and an approximate ingestion rate of 2.508 x l0-4mg C detritus/mg C shrimp hour-l occurred. It is hypothesized that coprophagous activity may be important to the completion of digestion of the plant material and that P. pugio in the wild are able to assimilate the plant components of detritus.
title: Ανάλυση υδρονυμαμικών ιδιοτήτων με τη χρήση του νευρωτικού δικτύου NARX
titleType: AlternativeTitle
Creators: name: Makropoulos, DImitris N.
Publisher: name: National Technological University of Athens
Year: 2012
Subjects: Νευρωνικό δίκτυο NARX
Θερμοκρασία
Αλατότητα
Υδροδυναμικές
Neural Autoregressive Networks with eXogenous Inputs (NARX)
Salinity
Temperature
NARX

description: 40 σ.
description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Μαθηματική Προτυποποίηση σε Σύγχρονες Τεχνολογίες στην Οικονομία”
description: Αναλύεται και διερευνάται η συμπεριφορά των υδροδυναμικών ιδιοτήτων μαζών νερού σε επιφανειακά και ενδιάμεσα βάθη από δεδομένα που ελήφθησαν από σταθμό του ΕΛΚΕΘΕ στην Πύλο και πραγματοποιούνται προβλέψεις με τη χρήση νευρωνικού δικτύου NARX
description: Analysis and forecasts of the Salinity and Temperature time series through different architectures of Neural Autoregressive Networks with eXogenous Inputs (NARX).
title: The involvement of oncogenic DNA viruses in Hodgkin's disease
Creators: name: Armstrong, Alison A.
Publisher: name: University of Glasgow
Year: 1994

description: At the outset of this project Epstein-Barr virus (EBV) was associated with a proportion of cases of Hodgkin's disease (HD). Clonal EBV genomes were detected in HD tumour material however the localisation of EBV within the malignant cells had not been clearly demonstrated. Following the availability of monoclonal antibodies to the EBV latent genes, the expression of LMP-1 and EBNA-2 was investigated in a series of HD cases. EBV LMP-1 was expressed in Reed-Sternberg (RS) cells in the majority of cases studied, however there was a lack of expression of EBNA-2. The detection of LMP-1, which has been shown to have oncogenic potential, has strengthened the evidence that EBV is involved in the pathogenesis of a proportion of HD cases. These results indicated that a distinct pattern of EBV latent gene expression, designated Lat II, was observed in HD. As LMP-1 has been shown to upregulate a number of cellular genes, the expression of CD23 and bcl-2 in HD were examined. CD23 and bcl-2 were rarely detected in RS cells. There was no correlation between LMP-1 expression and the presence of CD23 or bcl-2. These results indicate that the role of EBV in HD is independent of the upregulation of CD23 and bcl-2. Further evidence that EBV is localised to RS cells in HD was obtained following the detection of EBER RNA in RS cells using an in situ hybridisation technique. Comparison of techniques to detect EBV in HD tumour material indicated that the EBER RNA in situ hybridisation assay was the most useful and reliable method of determining EBV latent infection. We have categorised HD cases which were EBV-positive by in situ assays or using Southern blot hybridisation for the detection of clonal EBV genomes as EBV-associated. Using tine above criteria the epidemiological features of HD were investigated with respect to EBV. Paediatric HD cases, in particular cases <10 years of age, older adults and cases of MCHD subtype were strongly EBV-associated. There was no evidence that EBV is a useful prognostic marker. Although the epidemiological features of HD suggest that young adult HD is most likely to be caused by an infectious agent our results indicated that these cases, in particular NSHD, were seldom EBV-positive. We have speculated that another virus may be involved in this age group. In order to eliminate the possibility that other known DNA viruses may be involved in HD, we examined clinical samples from HD, NHL and reactive conditions for the presence of adenovirus, SV40, LPV and HHV-7. We have not detected any of the viruses in these clinical samples. The implications of these results will be discussed further in this thesis.
A Majorana Fermion t-J Model in One Dimension
Creators: name: Sen, Diptiman
name: Shastry, B. Sriram
Publisher: name: arXiv
Year: 1997
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a rotation invariant Majorana fermion model in one dimension using diagrammatic perturbation theory and numerical diagonalization of small systems. The model is inspired by a Majorana representation of the antiferromagnetic spin-1/2 chain, and it is similar in form to the t-J model of electrons, except that the Majorana fermions carry spin-1 and Z_2 charge. We discuss the implications of our results for the low-energy excitations of the spin-1/2 chain. We also discuss a generalization of our model from 3 species of Majorana fermions to N species; the SO(4) symmetric model is particularly interesting.
description: 29 LaTeX pages, 11 postscript figures
Order parameter of quasi-one-dimensional superconductors: symmetry features in quasiparticle density of states and spin susceptibility
Creators: name: Duncan, R. D.
name: Vaccarella, C. D.
name: de Melo, C. A. R. Sá
Publisher: name: arXiv
Year: 2001
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Recent experiments indicate that the Bechgaard salts (TMTSF)$_2$ ClO$_4$ and (TMTSF)$_2$ PF$_6$ may be unconventional triplet superconductors. The quasiparticle density of states and the uniform spin susceptibility tensor are computed at low temperatures for order parameter symmetries, as an attempt to narrow the number of possibilities based on experimental evidence.
description: 4 pages, 2 figures. Submitted to PRL on 12 February 2001
Can a Kasner Universe with a Viscous Cosmological Fluid be Anisotropic?
Creators: name: Brevik, I.
name: Pettersen, S. V.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A Bianchi type -I metric of Kasner form is considered, when the space is filled with a viscous fluid. Whereas an ideal (nonviscous) fluid permits the Kasner metric to be anisotropic provided that the fluid satisfies the Zel'dovich equation of state, the viscous fluid does not permit the Kasner metric to be anisotropic at all. In the latter case, we calculate the Kasner (isotropic) metric expressed by the fluid's density, pressure, and bulk viscosity, at some chosen instant $t=t_0$. The equation of state is also calculated. The present paper is related to a recent Comment of Cataldo and del Campo [Phys. Rev. D, scheduled to April 15, 2000], on a previous work of the present authors [Phys. Rev. D {\bf 56}, 3322 (1997)].
description: 8 pages, LaTeX, no figures. To appear in PRD
INNOVATIONS OF SPEECH CORPORA IN TEACHING ENGLISH
Creators: name: Turgunboyeva, Mukhabbat
Publisher: name: Zenodo
Year: 2024

description: This thesis examines the innovative applications of speech corpora in English language teaching, focusing on how advances in technology and linguistic research have reshaped pedagogical approaches. By analyzing the impact of speech corpora on language proficiency, pronunciation accuracy, listening skills, discourse analysis, and personalized learning experiences. Also, it aims to unravel the transformative potential of incorporating speech corpora into English language instruction. Furthermore, the thesis aspires to offer practical recommendations for harnessing the full potential of speech corpora to promote effective language learning, enhance communicative competence, and adapt to the evolving needs of English language learners in diverse educational contexts.
Additional file of The aspartic proteinase family of three Phytophthora species
Creators: name: Kay, John
name: Meijer, Harold JG
name: Have, Arjen Ten
name: Kan, Jan AL Van
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: Additional file of The aspartic proteinase family of three Phytophthora species
Hopf Term, Fractional Spin and Soliton Operators in the O(3) Nonlinear Sigma Model
Creators: name: Tsutsui, Izumi
name: Kimura, Masaomi
name: Kobayashi, Hiroyuki
Publisher: name: arXiv
Year: 1998
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: We re-examine three issues, the Hopf term, fractional spin and the soliton operators, in the 2+1 dimensional O(3) nonlinear sigma model based on the adjoint orbit parameterization (AOP) introduced earlier. It is shown that the Hopf Term is well-defined for configurations of any soliton charge $Q$ if we adopt a time independent boundary condition at spatial infinity. We then develop the Hamiltonian formulation of the model in the AOP and thereby argue that the well-known $Q^2$-formula for fractional spin holds only for a restricted class of configurations. Operators which create states of given classical configurations of any soliton number in the (physical) Hilbert space are constructed. Our results clarify some of the points which are crucial for the above three topological issues and yet have remained obscure in the literature.
description: 23 pages, Plain Tex
Additional file tables-figures from Evolution and phylogeography analysis of diploid and polyploid Misgurnus anguillicaudatus populations across China
Creators: name: Zhong, Jia
name: Shaokui Yi
name: Laiyan Ma
name: Weimin Wang
Publisher: name: The Royal Society
Year: 2019
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Evolutionary Biology

description: Supplementary Tables-Figures
Illumination Pattern Design with Deep Learning for Single-Shot Fourier Ptychographic Microscopy
Creators: name: Cheng, Yi Fei
name: Strachan, Megan
name: Weiss, Zachary
name: Deb, Moniher
name: Carone, Dawn
name: Ganapati, Vidya
Publisher: name: arXiv
Year: 2018
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Fourier ptychographic microscopy allows for the collection of images with a high space-bandwidth product at the cost of temporal resolution. In Fourier ptychographic microscopy, the light source of a conventional widefield microscope is replaced with a light-emitting diode (LED) matrix, and multiple images are collected with different LED illumination patterns. From these images, a higher-resolution image can be computationally reconstructed without sacrificing field-of-view. We use deep learning to achieve single-shot imaging without sacrificing the space-bandwidth product, reducing the acquisition time in Fourier ptychographic microscopy by a factor of 69. In our deep learning approach, a training dataset of high-resolution images is used to jointly optimize a single LED illumination pattern with the parameters of a reconstruction algorithm. Our work paves the way for high-throughput imaging in biological studies.
Electronic absorption of ferricenium derivatives: an unexpected twist
Creators: name: Khan, Firoz Shah Tuglak
name: Das, Sandip
name: Hematian, Shabnam
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Marine Biology
subject: Computational Biology

description: Our results revealed that the introduction of either electron-donating or electron-withdrawing group(s) on the cyclopentadienyl rings leads to a substantial red shift of the lowest energy ligand-to-metal charge transfer (LMCT) band, generally known as 2E2g → 2E1u, relative to that of the parent ferricenium complex. The observed stabilization of the lowest unoccupied molecular orbitals (LUMO), i.e. e2g orbitals, in the electron-deficient system, was ascribed to the δ back donation from the iron atom into the antibonding molecular orbitals of the ligand rings. A series of DFT calculations reproduce the experimental trend highlighting the shift in energies of the molecular orbitals involved in the charge transfer transition. The direct relationship between the location of the LMCT band and reduction potential for specific class of substituents is also presented which allows for more informed structural modifications in the development of these complexes.
Enhancement of Long Range Antiferromagnetic Order by Nonmagnetic Impurities in the Hubbard Model
Creators: name: Ulmke, M.
name: Denteneer, P.
name: Scalettar, R.
name: Zimanyi, G.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The two-dimensional Hubbard model with a bimodal distribution of on-site interactions, P(U_i) = (1-f)δ(U_i-U) + fδ(U_i), is studied using a finite temperature quantum Monte Carlo technique and dynamical mean-field theory. We find long range antiferromagnetic order off half-filling is stabilized by the disorder, due to localization of the dopants on the U=0 sites. Whereas in the clean model there is a single gap at n=1, for nonzero f we find the compressibility and density of states exhibit gaps at two separate fillings.
description: 6 pages with 5 figures, final version
Evaluation of enzymatic interesterification in structured triacylglycerols preparation: a concise review and prospect
Creators: name: Zhang, Zhen
name: Lee, Wan Jun
name: Wang, Yong
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Plant Biology

description: Enzymatic interesterification (EIE) is one of the emerging technologies in the specialty fats industry. EIE has several advantages over the conventional chemical interesterification method, such that the process has higher flexibility and efficiency, is environmentally friendly and the immobilized enzyme can be recycled besides of the lower requirement for substrate’s acid value. The physical properties and nutritional qualities of the fats and oils are modified after EIE, depending on the change in the position of fatty acids on the triacylglycerol (TAG) molecules. Evaluation of the interesterification reaction are important and useful in terms of its technological applications. This paper summarizes the conventional methods and the advancement for evaluating EIE processes, e.g., determination of the change in slip melting points, solid fat contents, TAG with equivalent carbon numbers, and sn-2 fatty acid compositions of the end product. Nonetheless, these methods are not comprehensive because during the EIE process, acyl migration occurs. A novel and convenient evaluation model which is based on the fatty acid distribution on the glycerol-backbone is proposed as a perspective. This model can be employed to monitor the interesterification degree and acyl migration during a regiospecific EIE process, which serves as a reaction rule that can be employed to control and optimize the EIE process, thereby producing structured TAG with desired properties.
White-Scalapino-like Stripes in a Mean-Field Hubbard Model
Creators: name: Kusko, C.
name: Markiewicz, R. S.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A mean field calculation of the Hubbard model finds a rich phase diagram. The antiferromagnetic phase is generally unstable away from half filling, and there are several regions of phase separation. One solution in particular closely resembles the stripe phase of White and Scalapino. By comparison to unrestricted Hartree-Fock calculations (for which this phase is metastable), it is demonstrated that this phase arises from phase separation. The interface surface tension is found to change sign below a particular stripe width, at which point the stripes begin to meander, gradually crossing over to diagonal.
description: 4 eps figures, revtex
Cosmic String Wakes in Scalar-Tensor Gravities
Creators: name: Masalskiene, S. R. M.
name: Guimaraes, M. E. X.
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The formation and evolution of cosmic string wakes in the framework of a scalar-tensor gravity are investigated in this work. We consider a simple model in which cold dark matter flows past an ordinary string and we treat this motion in the Zel'dovich approximation. We make a comaprison between our results and previous results obtained in the context of General Relativity. We propose a mechanism in which the contribution of the scalar field to the evolution of the wakes may lead to a cosmological observation.
description: Replaced version to be published in the Classical and Quantum Gravity
Effective drift and diffusivity in non-Gaussian random gradient flows
Creators: name: Drummond, I. T.
name: Horgan, R. R.
name: Santos, C. A. da Silva
Publisher: name: arXiv
Year: 1997
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the long-range effective drift and diffusivity of a particle in a random medium moving subject to a given molecular diffusivity and a local drift. The local drift models the effect of a random electrostatic field on a neutral but polarizable molecule. Although the electrostatic field is assumed to obey Gaussian statistics the induced statistics of the drift velocity field are non-Gaussian. We show that a four-loop perturbation theory calculation of the effective diffusivity is in rather good agreement with the outcome of a numerical simulation for a reasonable range of the disorder parameter. We also measure the effective drift in our simulation and confirm the validity of the ``Einstein relation'' that expresses the equality of the renormalization factors, induced by the random medium, for the effective drift and effective diffusivity, relative to their molecular values. The Einstein relation has previously only been confirmed for Gaussian random drift fields. The simulation result, for our non-Gaussian drift model, is consistent with a previous theoretical analysis showing the Einstein relation should remain true, independently of the precise character of the statistics of the drift velocity field.
description: 15 pages, LATEX2e, 5 figures, uses styles[12pt,epsfig]
Steady streaming viscometry of Newtonian liquids in microfluidic devices
Creators: name: Vishwanathan, Giridar
name: Juarez, Gabriel
Publisher: name: arXiv
Year: 2019
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We report a novel technique capable of measuring the kinematic shear viscosity of Newtonian liquids with steady streaming in microfluidic devices. This probe-free microrheological method utilizes sub-kilohertz liquid oscillation frequencies around a cylindrical obstacle, ensuring that the inner streaming layer is comparable in size to the cylinder radius. To calibrate the viscometer, the evolution of the inner streaming layer as a function of oscillation frequency for a liquid of known viscosity is characterized using standard particle tracking techniques. Once calibrated, we show how the steady streaming viscometer can be used to measure low-viscosity liquids and volatile liquids.
AXBOROT KOMMUNIKATSIYA TEXNOLOGIYALARI – RAQAMLI IQTISODIYOT VA STARTAP LOYIHALARNI RIVOJLANTIRISHNING ASOSIY OMILI SIFATIDA
Creators: name: Xaqqulova, Rano
Publisher: name: Zenodo
Year: 2024

description: Mazkur maqolada raqamli iqtisodiyot va startap loyihalarining rivojlanishi tahlil qilinadi hamda olingan natijalar asosida mamlakatimizda raqamli iqtisodiyot va startap loyihalarini rivojlantirish boʻyicha bir qancha muammolar va ularning mumkin boʻlgan yechimlari atroflicha koʻrib chiqiladi. Bundan tashqari, respublikamiz iqtisodiyotining turli sohalarida raqamli texnologiyaning global ahamiyatga ega boʻlgan platformalarini yaratish mexanizmlari haqida batafsil bayon etilgan.
Spectral Evolution of the Universe
Creators: name: Seriu, Masafumi
Publisher: name: arXiv
Year: 2000
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We derive the evolution equations for the spectra of the Universe. Here "spectra" means the eigenvalues of the Laplacian defined on a space, which contain the geometrical information on the space. These equations are expected to be useful to analyze the evolution of the geometrical structures of the Universe. As an application, we investigate the time evolution of the spectral distance between two Universes that are very close to each other; it is the first necessary step for the detailed analysis of the model-fitting problem in cosmology with the spectral scheme. We find out a universal formula for the spectral distance between two very close Universes, which turns out to be independent of the detailed form of the distance nor the gravity theory. Then we investigate its time evolution with the help of the evolution equations we derive. We also formulate the criteria for a good cosmological model in terms of the spectral distance.
description: To appear in Phys. Rev. D
Mit den Mitteln des Affekts: Katarina Zdjelars The Perfect Sound eine (nicht) diagnostische Gegenwartskritik?!
Creators: name: Bippus, Elke
Publisher: name: Zenodo
Year: 2019
Subjects: Kunst
Künstlerische Forschung
Repräsentationskritik
Art
Affects
Affekt
Analyse
Analysis
Critique of Representation

description: Kein Abstract vorhanden.
description: + ID: 578157 + PeerReviewed: Peer Reviewed
Values of random polynomials in shrinking targets
Creators: name: Kelmer, Dubi
name: Yu, Shucheng
Publisher: name: arXiv
Year: 2018
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Relying on the classical second moment formula of Rogers we give an effective asymptotic formula for the number of integer vectors $v$ in a ball of radius $t$, with value $Q(v)$ in a shrinking interval of size $t^{-κ}$, that is valid for almost all indefinite quadratic forms in $n$ variables for any $κ
Changing character and waning impact of COVID-19 at a tertiary centre in Cape Town, South Africa.
Creators: name: Hermans, Lucas E
name: Booysen, Petro
name: Boloko, Linda
name: Adriaanse, Marguerite
name: de Wet, Timothy J
name: Lifson, Aimee R
name: Wadee, Naweed
name: Papavarnavas, Nectarios
name: Marais, Gert
name: Hsiao, Nei-Yuan
name: Rosslee, Michael-Jon
name: Symons, Gregory
name: Calligaro, Gregory L
name: Iranzadeh, Arash
name: Wilkinson, Robert J
name: Ntusi, Ntobeko AB
name: Williamson, Carolyn
name: Davies, Mary-Ann
name: Meintjes, Graeme
name: Wasserman, Sean
Publisher: name: The Francis Crick Institute
Year: 2024
Subjects: classificationCode: Infectious Disease
subject: Infectious Disease
classificationCode: Immunology
subject: Immunology
subject: FOS: Clinical medicine
classificationCode: Human Biology & Physiology
subject: Human Biology & Physiology
classificationCode: Model organisms
subject: Model organisms

description: BACKGROUND: The emergence of genetic variants of SARS-CoV-2 was associated with changing epidemiological characteristics throughout coronavirus disease 2019 (COVID-19) pandemic in population-based studies. Individual-level data on the clinical characteristics of infection with different SARS-CoV-2 variants in African countries is less well documented. OBJECTIVES: To describe the evolving clinical differences observed with the various SARS-CoV-2 variants of concern and compare the Omicron-driven wave in infections to the previous Delta-driven wave. METHOD: We performed a retrospective observational cohort study among patients admitted to a South African referral hospital with COVID-19 pneumonia. Patients were stratified by epidemiological wave period, and in a subset, the variants associated with each wave were confirmed by genomic sequencing. Outcomes were analysed by Cox proportional hazard models. RESULTS: We included 1689 patients were included, representing infection waves driven predominantly by ancestral, Beta, Delta and Omicron BA1/BA2 & BA4/BA5 variants. Crude 28-day mortality was 25.8% (34/133) in the Omicron wave period versus 37.1% (138/374) in the Delta wave period (hazard ratio [HR] 0.68 [95% CI 0.47-1.00] p = 0.049); this effect persisted after adjustment for age, gender, HIV status and presence of cardiovascular disease (adjusted HR [aHR] 0.43 [95% CI 0.28-0.67] p < 0.001). Hospital-wide SARS-CoV-2 admissions and deaths were highest during the Delta wave period, with a decoupling of SARS-CoV-2 deaths and overall deaths thereafter. CONCLUSION: There was lower in-hospital mortality during Omicron-driven waves compared with the prior Delta wave, despite patients admitted during the Omicron wave being at higher risk. CONTRIBUTION: This study summarises clinical characteristics associated with SARS-CoV-2 variants during the COVID-19 pandemic at a South African tertiary hospital, demonstrating a waning impact of COVID-19 on healthcare services over time despite epidemic waves driven by new variants. Findings suggest the absence of increasing virulence from later variants and protection from population and individual-level immunity.
Two-impurity-entanglement generation by electron scattering in zigzag phosphorene nanoribbons
Creators: name: Amini, M.
name: Soltani, M.
name: Ghanbari-Adivi, E.
name: Sharbafiun, M.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In this paper, we investigate how two on-side doped impurities with net magnetic moments in an edge chain of a zigzag phosphorene nanoribbon~(zPNR) can be entangled by scattering of the traveling edge-state electrons. To this end, in the first step, we employ the Lippmann-Schwinger equation as well as the Green's function approach to study the scattering of the free traveling electrons from two magnetic impurities in a one-dimensional tight-binding chain. Then, following the same formalism, that is shown that the behavior of two on-side spin impurities in the edge chain of a zPNR in responding to the scattering of the edge-state traveling electrons is very similar to what happens for the one-dimensional chain. In both cases, considering a known incoming wave state, the reflected and transmitted parts of the final wave state are evaluated analytically. Using the obtained results, the related partial density matrices and the reflection and transmission probabilities are computable. Negativity as a measure of the produced entanglement in the final state is calculated and the results are discussed. Our theoretical model actually proposes a method, which is perhaps experimentally performable to create the entanglement in the state of the impurities.
A hexanuclear cerium(IV) complex with the non–steroidal anti–inflammatory drug mefenamic acid
Creators: name: Perontsis, Spyros
name: Chrysoulidis, Vladimiros
name: Hatzidimitriou, Antonios G.
name: Psomas, George
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Molecular Biology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified

description: A hexanuclear cerium(IV) complex with a non–steroidal anti–inflammatory drug mefenamic acid (Hmef) as a ligand has been synthesized and characterized by diverse techniques. The molecular structure of the complex was determined by single–crystal X–ray crystallography revealing the formula [Ce6(O)4(OH)4(mef)12(DMF)2]. The antioxidant activity of the complex was evaluated for its ability to scavenge free radicals. The interaction of the complex with calf–thymus DNA was studied by diverse techniques showing its potency to intercalate to DNA. The interaction of the complex for human and bovine serum albumins was studied by fluorescence emission spectroscopy and revealed its tight and reversible binding to the albumins.
SKILLS DYNAMICS: PANACEA TO TVET PERFORMANCE IN THE CAPTAIN ELECHI AMADI POLYTECHNIC, PORT HARCOURT, RIVERS STATE
Creators: name: Gloria Chike, PhD, Okachi-Okereke
name: Ebisemen, Patience Lulu-Pokubo, PhD
Publisher: name: ZAP journals
Year: 2024
Subjects: Skill Dynamics
TVET Performance
Captain Elechi Amadi Polytechnics

description: This study examines skills dynamics as the panacea to technical vocational education training in Captain Elechi Amadi Polytechnic. The purpose of this study was to establish the difference between skills dynamics and TVET performance at Captain Elechi Amadi Polytechnic. The study adopted an post-factor research design, which was considered appropriate for the study because the data collected were original and secondary data were obtained from the institution’s admission enrolment record of female students  for the period of three(3) years, i.e., 2021–2023, and the graduated students list . The departments used as the population of the study were Science Laboratory Technology, Agricultural Technology, Electrical/Electronic Engineering, Computer Science, and Building Technology, which comprised 1045 female students.  The independent variable (Skills Dynamics) is represented by practical training/enlightenment, while the dependent variable (TVET Performance) is represented by female students’ enrollment and female students’ grade points. The study applied the t-test for an independent sample. The result of the findings revealed that, TVET in the CEAPOLY Chapter is yet to make a significant difference in the number of enrolment of female students and in their grade points. As the result revealed, there is no significant difference in both female student enrolment nor on the grade point at 0.05% level of significance afterher inauguration in march, 2020.  The study therefore concluded that, TVET in CEAPOLY has not actually made much impact in the sensitizing of female students to increase in their female student enrollments into STEAM departments and improvement of the grade point respectively. The researchers therefore recommended, among others, that TEVT CEAPOLY should rise up and heat the grounding running with an intensive sensitization in specialized fields such as agricultural technology, electrical electronics engineering, science laboratory, and computer science to improve drastically and inculcate in females the spirit of self -reliance to face the curve ahead at their workplaces.
Chloride tuning of the pK a-controlled reactivity of the NewTAML activator [FeIII{4-NO2C6H3-1, 2-(NCOCMe2 NSO2)2CHMe}(OH2)]−
Creators: name: Pal, Parameswar
name: Ryabov, Alexander D.
name: Collins, Terrence J.
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Biophysics
subject: Biochemistry
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: Chemical Sciences not elsewhere classified
subject: Mental Health
subject: Computational Biology

description: The kinetics of oxidation catalysis by TAML activators of peroxides [LFeIII(OH2)]− (TAML = tetraamido macrocyclic ligand) in water can be typically quantified by a mechanism comprised of two key steps: catalyst activation to the reactive state with rate constant kI, followed by substrate oxidation with rate constant kII. Usually, kI ≪ kII and the overall catalytic activity is limited by the first step. The second-order rate constant kI can be enhanced by changing structural features in the TAML macrocycle that make the iron site more electrophilic. Chemical interventions beyond changes at the catalyst itself should also be able to change kI. In examining potentially useful interventions, the effect of chloride on kI was explored and an intriguing fact was found. For the NewTAML catalyst, [FeIII{4-NO2C6H3-1,2-(NCOCMe2NSO2)2CHMe}(OH2)]−, increasing chloride concentration reduces the rate constant kI when the pH is below the pKa of the catalyst ([LFeIII(OH2)]− ⇄ [LFeIII(OH)]2− + H+), but increases kI when the pH > pKa. Mechanisms of the observed deceleration/acceleration effects are discussed. A linear dependence between KCl and pKa for iron(III) TAMLs is established: logKCl = 16 ± 2 – (1.6 ± 0.2) × pKa.
Photoluminescence signatures of negatively charged magnetoexcitons
Creators: name: Chapman, J. R.
name: Johnson, N. F.
name: Nicopoulos, V. N.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: The negatively charged quasi-two-dimensional exciton ($X^-$) is studied numerically in the presence of a uniform B-field and various in-plane confinements. The corresponding photoluminescence (PL) spectra, including shakeup processes, are calculated. These calculations provide a quantitative explanation of recent experimental PL spectra. The photoluminescence signatures of charged excitons in quantum dots are also examined. Electron-hole pair distriution functions are calculated which show the structure of the charged exciton states (both ground and excited states). Increasing excitation reflects a competition between two effects: partial ionization of either one or two electrons.
description: 29 pages LaTeX, 18 ps figures. Minor alterations. To appear in Physical Review B
Eupithecia gradatilinea Prout L. B. 1916
Creators: name: Mbata, Keith J.
name: Prins, Jurate De
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Geometridae
Eupithecia
Eupithecia gradatilinea

description: Eupithecia gradatilinea Prout L.B., 1916
COMMON NAME(S): Geometer moth.
SYNONYM(S): Eupithecia rubidimixta Prout, 1916.
IUCN STATUS: Not Evaluated (NE).
DISTRIBUTION: Equatorial Guinea, Kenya, Malawi, South Africa, Zambia, Zimbabwe.
LOCALITY IN ZAMBIA: Mwinilunga, in Northwestern Province.
LARVAL HOSTPLANT(S): In Kenya Vachellia xanthophloea (Benth.) P.J.H.Hurter (Fabaceae) is reported as the host plant of the taxon while in Zambia and other African countries listed above, the host plants are unknown.
SOURCES: De Prins & De Prins 2022; Karisch 2011.
Genus Horisme H̡bner, 1825
description: Published as part of Mbata, Keith J. & Prins, Jurate De, 2023, Annotated checklist of moths of Zambia (Insecta: Lepidoptera), pp. 1-503 in Zootaxa 5354 (1) on page 245, DOI: 10.11646/zootaxa.5354.1.1, http://zenodo.org/record/10130434
Statistical Entropy of BTZ Black Hole in Higher Curvature Gravity
Creators: name: Saida, Hiromi
name: Soda, Jiro
Publisher: name: arXiv
Year: 1999
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For the BTZ black hole in the Einstein gravity, a statistical entropy has been calculated to be equal to the Bekenstein-Hawking entropy. In this paper, the statistical entropy of the BTZ black hole in the higher curvature gravity is calculated and shown to be equal to the one derived by using the Noether charge method. This suggests that the equivalence of the geometrical and statistical entropies of the black hole is retained in the general diffeomorphism invariant theories of gravity. A relation between the cosmic censorship conjecture and the unitarity of the conformal field theory on the boundary of AdS is also discussed.
description: 9 pages, no figure, submitted to Physics Letters B
Synthesis of phthalocyanine/C3N4 structures and investigation of photocatalytic activities in the oxidation reaction of 4-nitrophenol
Creators: name: Saka, Ece Tugba
name: Senocak, Ahmet
name: Akkol, Cagla
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Photocatalytic oxidation is an advanced oxidation technique widely preferred for the removal of pollutants in wastewater. In this work, paramagnetic metallo-phthalocyanines EB2 and EB3 (Co(II)phthalocyanine and Cu(II)phthalocyanine) have been synthesized and characterized. They were interfaced with C3N4 (graphitic carbon nitride) to prepare metallophthalocyanines/C3N4 structures (EB2-C3N4 and EB3-C3N4) using ultrasonic methods. New structures were identified with FT-IR, SEM and TGA. The photocatalytic performances of EB2-C3N4 and EB3-C3N4 for reaction with p-nitrophenol (p-NP) were established. The product selectivity for industrially important benzaldehyde was 85.1% for EB2-C3N4 and 80.6% for EB3-C3N4. EB2-C3N4 showed good potential for p-NP photocatalyic oxidation with high turn-over number (TON) and turn-over frequency (TOF) (390 and 1565) over 15 min. Upon excitation of EB2-C3N4 and EB3-C3N4 with light, 4-nitrophenol was easily reduced to hydroquinone, prompted by electron transfer from C3N4 to phthalocyanine and from phthalocyanine to 4-nitrophenol. Computational investigations were used to determine the energies of the highest occupied molecular orbitals (HOMO) and the lowest unoccupied molecular orbitals (LUMO) of EB2, EB3 and C3N4.
Finite-Size Corrections in Lyapunov Spectra for Band Random Matrices
Creators: name: Kottos, T.
name: Politi, A.
name: Izrailev, F. M.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The transfer matrix method is applied to quasi one-dimensional and one-dimensional disordered systems with long-range interactions, described by band random matrices. We investigate the convergence properties of the whole Lyapunov spectra of finite samples as a function of the bandwidth and of the sample length. Two different scaling laws are found at the maximal and minimal Lyapunov exponents.
description: 13 pages in LaTex and 5 Postscript figures
The Bose Metal: gauge field fluctuations and scaling for field tuned quantum phase transitions
Creators: name: Das, D.
name: Doniach, S.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: In this paper, we extend our previous discussion of the Bose metal to the field tuned case. We point out that the recent observation of the metallic state as an intermediate phase between the superconductor and the insulator in the field tuned experiments on MoGe films is in perfect consistency with the Bose metal scenario. We establish a connection between general dissipation models and gauge field fluctuations and apply this to a discussion of scaling across the quantum phase boundaries of the Bose metallic state. Interestingly, we find that the Bose metal scenario implies a possible {\em two} parameter scaling for resistivity across the Bose metal-insulator transition, which is remarkably consistent with the MoGe data. Scaling at the superconductor-metal transition is also proposed, and a phenomenolgical model for the metallic state is discussed. The effective action of the Bose metal state is described and its low energy excitation spectrum is found to be $ω\propto k^{3}$.
description: 15 pages, 1 figure
Mechanical adaptation of human trabecular bone: experimental and computational study
Creators: name: Du, Juan
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 91399 Mechanical Engineering not elsewhere classified
subject: FOS: Mechanical engineering

description: Adaptation is a complex feature of living tissues, including bone. Compared with engineering materials, the structural and material properties of bone keep changing to fulfil the requirements of physiological functions throughout a lifetime. However, a disorder of this process could lead to serious bone diseases such as osteoporosis. Understanding the adaptation associated with architecture and mechanical properties of trabecular bone are key factors in diagnosis, prediction and treatment of osteoporosis. There are well-established theories that mechanical loads such as exercise can stimulate structural adaptation of trabecular bone. Previous research focused mostly on the effect of in-vivo loading on trabecular microstructure at the whole-bone level in both animal or human studies, while understanding of mechanically-induced local adaptation of human trabecular bone is rather limited.The study was based on a hypothesis that trabecular-bone adaptation, including microstructural and mechanical competence, is inherently heterogeneous, hence, may not be captured adequately by the global analysis based on averaging.
DFT analysis of the concerted metalation-deprotonation in earth-abundant 3d-transition-metal mediated C–H activations
Creators: name: Grumbles, William M.
name: Kimbrough, Cooper J.
name: Cundari, Thomas R.
Publisher: name: Taylor & Francis
Year: 2024
Subjects: Biophysics
Biochemistry
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified

description: Methane activation and functionalization under catalytic conditions remains a challenge that must be addressed to make this abundant alkane, the primary component of natural gas, into a more useful resource. One possible method of methane activation is concerted metalation-deprotonation (CMD), which thus far has been largely limited to precious metals and more reactive substrates. In this DFT study, CMD activation of methane is assessed employing more earth-abundant 3d transition metal complexes to assess the effects of metal, ligands, etc. upon the kinetics and thermodynamics of methane C–H activation via CMD mechanisms. Key findings from this study reveal the strong influence spin states as well as ligand modification have on the activation energy barriers. Moreover, an unexpected observation pertaining to ligand modification was seen where the acetate ligand exhibited higher computed free energy barriers compared to the trifluoroacetate ligand. Although acetate is more basic than trifluoroacetate, the ligand directing effects ultimately had a greater influence on the thermodynamic control of the CMD mechanism being studied here.
Structure and dynamics of a self-propelled semiflexible filament
Creators: name: Anand, Shalabh K.
name: Singh, Sunil P.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate structural and dynamical properties of a self-propelled filament using coarse-grained Brownian dynamics simulations. A self-propulsion force is applied along the bond vectors, i.e., tangent to the filament and their locations are considered in two different manners. In case one, force is applied to all beads of the filament, which is termed as homogeneous self-propulsion. Here, we obtain a monotonic decrease in the flexibility of the filament with Péclet number. Hence, radius of gyration also displays the same trend. Moreover, the radius of gyration of the filament shows universal dependence for various bending rigidities with flexure number. The effective diffusivity of the filament shows enhancement with the active force and it increases linearly with force and bending rigidity. In case two, self-propulsion force is applied only to few bond vectors. The location of active forces is chosen in a periodic manner starting from the tail of the filament and leaving the front end without force. In this case, filament acquires various structures such as rod-like, helical, circular, and folded states. The transition from several states is understood in terms of tangent-tangent correlation, bending energy and torsional order parameter. The helical state is identified through a crossover from exponential to oscillatory behavior of the tangent-tangent correlation. A sudden increase in the bending energy separates a helical to a folded states of the filament.
description: 10 pages, 9 figures