cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Bućkalo za predsednika SANU Vladimira S. Kostića
Creators: name: Vukajlović, Rake Filip
Publisher: name: Zenodo
Year: 2022
Subjects: SANU
Srpska akademija nauka i umetnosti
nauka
članstvo
Matematički Institut SANU

description: Esej: "SANU: BRAĆA, SESTRE, ZETOVI – SINOVI I UNUCI SAMO ŠTO NISU", sa 9 (devet) priloga, je inspirisan prijemom u SANU 4.11.2021. godine naučnog savetnika Matematičkog Instituta SANU - zeta predsednika Srpske akademije nauka i umetnosti Vladimira S. Kostića. Esej razmatra, kako naučna dostignuća pomenutog z e t a, tako i izražene pojave nepotizma u SANU, praćene mnogim sumnjivim šemama za pribavljanje projekata i novca za odabrane, što je svoju kulminaciju doživelo u poslednja dva Kostićeva mandata na čelu SANU. Prilozi uz osnovni tekst: Prilog 1: 'Blic' recenzija 19 Mihaljevićevih radova, koje je on priložio kao svoje rezultate u periodu 2010–2019.pdf; Prilog 2: Mihaljević na veštačkoj inteligenciji.pdf; Prilog 3: Nagrada SANU Pavle Blagojević kandidatura [2013].pdf; Prilog 4: Predlog_za_Nagradu_SANU–NMSKSMMZMZO.pdf; Prilog 5: Прилози за биографију Александре Дрецун 7.01.2020.pdf; Prilog 6: Светислав В. Костић – човек 'дуалне природе' који све зна!.pdf; Prilog 7: Владимир С. Бушин о Нарочницкој – на руском.pdf; Prilog 8: Propratno pismo uz poruku akademicima i istraživačima.pdf; Prilog 9: Pismo Predsednika SANU V Kostića članovima SANU.pdf. Ovaj esej je 17.01.2022. godine poslat elektronskom poštom na više stotina adresa istraživača prirodnih nauka u Beogradu i svim akademicima SANU (sadržaj elektronske pošte dat je priložen u Propratno pismo uz poruku akademicima i istraživačima.pdf). Na njega je službenim aktom sa pečatom i zavodnim brojem 80/1 od 19.01.2021. godine - reagovao predsednik SANU. To pismo svim akademicima SANU je, takođe, priloženo: Pismo Predsednika SANU V Kostića članovima SANU.pdf.
Key issues in professionalizing mentoring practices
Creators: name: Stöger, Heidrun
name: Balestrini, Daniel P.
name: Ziegler, Albert
Publisher: name: Universität Regensburg
Year: 2021
Subjects: subject: mentoring, STEM, best practice, talent development, research, professionalization
subject: 370 Erziehung, Schul- und Bildungswesen

description: Mentoring has experienced a tremendous upswing over the past decades, which has only recently slowed down somewhat. One possible factor explaining mentoring's popularity are numerous case studies suggesting that it is one of the most effective ways of helping individuals to develop. Meta‐analyses indicating effect sizes for mentoring that are below what would theoretically be possible appear to contradict the success stories, however. This circumstance raises questions about the professionalization of mentoring practices. We focus on seven key issues for future efforts at professionalizing mentoring. Key issues 1 and 2 address observation of the state of the art within formal mentoring when programs are planned and implemented: the consideration of recent research and of best practices. While both areas can overlap, they provide complementary sources of pertinent information for the professionalization of mentoring. Key issues 3–6 address the need to align mentoring activities to the specific context and goals of individual mentoring programs by observing idiographic program characteristics, mentoring dynamics, the orchestration of mentoring goals, and the provision of mentoring resources. Finally, key issue 7 highlights ongoing evaluation as the basis of the effective, continuous improvement of mentoring programs.
Genus Bounds for Harmonic Group Actions on Finite Graphs
Creators: name: Corry, Scott
Publisher: name: arXiv
Year: 2010
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 05E18 (Primary) 14H37 (Secondary)

description: This paper develops graph analogues of the genus bounds for the maximal size of an automorphism group of a compact Riemann surface of genus $g\ge 2$. Inspired by the work of M. Baker and S. Norine on harmonic morphisms between finite graphs, we motivate and define the notion of a harmonic group action. Denoting by M(g) the maximal size of such a harmonic group action on a graph of genus $g\ge 2$, we prove that $4(g-1)\le M(g)\le 6(g-1)$, and these bounds are sharp in the sense that both are attained for infinitely many values of g. Moreover, we show that the values $4(g-1)$ and $6(g-1)$ are the only values taken by the function $M(g)$.
description: 14 pages with 6 figures; section 8 rewritten to correct an error in lemma 8.2; published version
The role of visual cues in detecting irony
Creators: name: Giustolisi, Beatrice
name: Panzeri, Francesca
Publisher: name: Proceedings of Sinn und Bedeutung
Year: 2021

description: We present four studies that aimed at investigating the contribution of purely visual cues for the detection of irony. In Study 1-3, we presented, without any preceding context, remarks (criticisms and compliments) uttered with sincere and with ironic intent, in three modalities: in the V modality participants could read the comment and see speakers’ facial expressions and bodily movements; in the A modality they could only hear the audio tracks of the uttered sentences; in the VA modality, both visual and auditory information were present. We found that purely visual cues were sufficient to discriminate the ironic intent of the speakers. In Study 4 we presented comments in the V modality, without showing the content of the remark: Accuracy in the detection of sarcasm dropped. We discuss that irony in Study 1-3 might have been recognized indirectly, by comparing the polarity of the remark with the polarity of the actors’ attitude, and we interpret Study 4 data as casting some doubts on the idea that there exist visual cues that specifically convey the speaker’s ironic intent.
description: Proceedings of Sinn und Bedeutung, Vol 25 (2021): Proceedings of Sinn und Bedeutung 25
Ketenes as Privileged Synthons in the Synthesis of Heterocyclic Compounds Part 3. Six-Membered Heterocycles
Creators: name: Mommahed Heravi, Majid
name: Talaei, Bahareh
Publisher: name: figshare
Year: 2022
Subjects: subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: FOS: Chemical sciences
subject: 30701 Quantum Chemistry
subject: 39904 Organometallic Chemistry
subject: 60105 Cell Neurochemistry
subject: FOS: Biological sciences
subject: Organic Chemistry
subject: 30502 Natural Products Chemistry
subject: 30599 Organic Chemistry not elsewhere classified
subject: Nuclear Chemistry
subject: 30205 Non-metal Chemistry
subject: 30504 Organic Green Chemistry
subject: 30303 Optical Properties of Materials

description: Ketenes are mostly used as common starting materials for structurally diverse mono-, spiro- and fused six-membered heterocycles such as lactones, pyrans, pyronones, pyridines, quinolines, isoquinolines, oxazine, quinoxalines, thiazines, oxathines, etc.
COMMUNITY PARTICIPATION IN TOURISM DEVELOPMENT IN BASANTAPUR – GUPHAPOKHARI TEHRATHUM
Creators: name: Khadka, Pradeep Kumar
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Travel and Tourism
subject: Sustainable tourism
subject: Ecotourism
subject: Community participation
subject: Tourism Development

description: This thesis explores the role of community participation in tourism development, focusing on Basantapur – Guphapokhari, Tehrathum, Nepal (Eastern Nepal). The study examines how local involvement influences sustainable tourism, economic benefits, and cultural preservation in rural areas.
Misura del diametro solare ad almucantarat zero
Creators: name: Sigismondi, Costantino
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Among several methods for accurate measurements of solar diameter, there are transits at fixed almucantarat used in solar astrolabes. The almucantarat is a circle of given height. The horizon circle is the zero almucantarat, and data from four sunsets on the Tyrrenian sea are discussed. The angular diameter of the Sun is recovered with a few arcseconds accuracy using 60 fps video of sunsets.
description: 3 pages, 6 figures, Proceedings of the 42nd UAI congress, Padova - Italy, 24-27 September 2009, to appear in Astronomia UAI
Distribution of relative velocities in turbulent aerosols
Creators: name: Gustavsson, K.
name: Mehlig, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We compute the distribution of relative velocities for a one-dimensional model of heavy particles suspended in a turbulent flow, quantifying the caustic contribution to the moments of relative velocities. The same principles determine the corresponding caustic contribution in $d$ spatial dimensions. The distribution of relative velocities Δv at small separations R acquires the universal form ρ(Δv,R) ~ R^{d-1}|Δv|^{D_2-2d} for large (but not too large) values of |Δv|. Here D_2 is the phase-space correlation dimension. Our conclusions are in excellent agreement with numerical simulations of particles suspended in a randomly mixing flow in two dimensions, and in quantitative agreement with published data on direct numerical simulations of particles in turbulent flows.
description: Revised version, as published. 4 pages, 2 figures
NP-hardness of decoding quantum error-correction codes
Creators: name: Hsieh, Min-Hsiu
name: Gall, Francois Le
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Though the theory of quantum error correction is intimately related to the classical coding theory, in particular, one can construct quantum error correction codes (QECCs) from classical codes with the dual containing property, this does not necessarily imply that the computational complexity of decoding QECCs is the same as their classical counterparts. Instead, decoding QECCs can be very much different from decoding classical codes due to the degeneracy property. Intuitively, one expect degeneracy would simplify the decoding since two different errors might not and need not be distinguished in order to correct them. However, we show that general quantum decoding problem is NP-hard regardless of the quantum codes being degenerate or non-degenerate. This finding implies that no considerably fast decoding algorithm exists for the general quantum decoding problems, and suggests the existence of a quantum cryptosystem based on the hardness of decoding QECCs.
description: 5 pages, no figure. Final version for publication
Open Gromov-Witten Invariants of Toric Calabi-Yau 3-Folds
Creators: name: Fang, Bohan
name: Liu, Chiu-Chu Melissa
Publisher: name: arXiv
Year: 2011
Subjects: subject: Symplectic Geometry (math.SG)
subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We present a proof of the mirror conjecture of Aganagic-Vafa [arXiv:hep-th/0012041] and Aganagic-Klemm-Vafa [arXiv:hep-th/0105045] on disk enumeration in toric Calabi-Yau 3-folds for all smooth semi-projective toric Calabi-Yau 3-folds. We consider both inner and outer branes, at arbitrary framing. In particular, we recover previous results on the conjecture for (i) an inner brane at zero framing in the total space of the canonical line bundle of the projective plane (Graber-Zaslow [arXiv:hep-th/0109075]), (ii) an outer brane at arbitrary framing in the resolved conifold (Zhou [arXiv:1001.0447]), and (iii) an outer brane at zero framing in the total space of the canonical line bundle of the projective plane (Brini [arXiv:1102.0281, Section 5.3]).
description: 39 pages, 11 figures
A three dimensional analysis of the effect of irrigant flow velocity on endodontic biofilms
Creators: name: Mirdad, Lujain
Publisher: name: University of British Columbia
Year: 2017

description: Introduction: Irrigation of the root canal system is an essential part of disinfection during root canal treatment. Some irrigants have the ability to dissolve or detach the biofilm from the dentin surface as well as kill residual bacteria. Several chemical and physical parameters affect the effectiveness of the irrigation process. Aim: The primary aim of this study is to investigate the effect of irrigation flow velocity on the biovolume of the biofilm and antimicrobial effect against biofilm microbes. Materials and methods: Hydroxyapatite discs coated with type I collagen were used as the biofilm substrate. Mixed supra- and sub-gingival plaque was collected from a single donor and suspended in Brain Heart Infusion broth (BHI). The discs were placed in 24-well tissue culture plates containing BHI-plaque suspension. They were then incubated under anaerobic conditions for three weeks. BHI medium was replaced with a fresh solution once a week. After three weeks of biofilm growth, the discs were placed in a CDC Biofilm reactor placed on a magnetic stir plate. The speed settings used were 60 rpm and 200 rpm both for 30 and 60 seconds. 0.1 % Sodium hypochlorite solutions and sterilized spring water were utilized for the experiment. Control samples were not subjected to any treatment. After treatment, all discs were stained with a viability stain and assessed under a confocal laser scanning microscope. The total biofilm volume and percentage of dead bacteria were calculated using the Bioimage L software. Results: Sodium hypochlorite NaOCl at 200 rpm was significantly more effective than control groups in reducing biofilm volume and killing biofilm bacteria. At slower flow velocity (60 rpm), there was no difference when compared to the negative control groups not subjected to any treatment. Multivariate analysis results revealed that irrigant type and flow velocity had a significant effect on reducing biofilm volume and killing biofilm bacteria. Exposure time influenced the biofilm volume only (p< 0.001). Conclusion: Irrigation flow velocity is a significant factor in the antimicrobial effectiveness of irrigation procedures. Our findings demonstrate is important to consider irrigation fluid dynamics when studying the antimicrobial effects of different irrigants in the future.
Cosmic Mach Number: A Sensitive Probe for the Growth of Structure
Creators: name: Ma, Yin-Zhe
name: Ostriker, Jeremiah P.
name: Zhao, Gong-Bo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this Letter, we investigate the potential power of the Cosmic Mach Number (CMN), which is the ratio between the mean velocity and the velocity dispersion of galaxies as a function of cosmic scales, to constrain cosmologies. We first measure the CMN from 5 catalogues of galaxy peculiar velocity surveys at low redshift (0.002
description: 7 pages, matches the version accepted to JCAP
Perfect fluids from high power sigma-models
Creators: name: Slobodeanu, Radu
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Certain solutions of a sextic sigma-model Lagrangian reminiscent of Skyrme model correspond to perfect fluids with stiff matter equation of state. We analyse from a differential geometric perspective this correspondence extended to general barotropic fluids.
description: 17 pages. Version published in IJGMMP 8 (2011). Added Example 3.4 and 1 reference
No specialist pheromone-ignoring ants in Lasius niger
Creators: name: Koch, Alexandra
name: Czaczkes, Tomer J.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: Behavioural castes, individual differences, pheromone trails, scouts, social information
subject: 590 Tiere (Zoologie)

description: In insect societies, the balance between exploitation of known resources and exploration of new ones is important to ensure sufficient resources. Mass recruiting ants, such as Lasius niger, use pheromone trails to recruit nestmates to a newly discovered food source. Pheromone following, however, shows characteristic non‐following (lapse) rates among different species, with ∼20% of L. niger foragers ignoring pheromone. These characteristic lapse rates might simply be ‘noise’, or they might indicate a subset of specialised explorative foragers, a scouting caste, that consistently ignores pheromone in order to explore. Here we show pheromone ignoring is not a repeatable behaviour in L. niger foragers – ants who did not follow a trail were no more likely to ignore it again an hour later than ants which did follow it. Our findings suggest that there is no subset of specialised pheromone‐ignoring L. niger foragers. This may be due to their moderate colony size and strong reliance on individual memories: species with larger colony sizes or a weaker reliance on private information (i.e. memory) may have specialist non‐followers. Our work raises the question: what is a scout ant? We encourage future research to investigate the presence of a scouting caste in other ant species using our straightforward methodology, as a social information‐ignoring caste may be rarer than expected.
Noetherian type in topological products
Creators: name: Kojman, Menachem
name: Milovich, David
name: Spadaro, Santi
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Topology (math.GN)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03E04, 54A25 (Primary) 03E55, 54B10, 54D70, 54G10 (Secondary)

description: The cardinal invariant "Noetherian type" of a topological space $X$ (Nt(X)) was introduced by Peregudov in 1997 to deal with base properties that were studied by the Russian School as early as 1976. We study its behavior in products and box-products of topological spaces. We prove in Section 2: 1) There are spaces $X$ and $Y$ such that $Nt(X \times Y) < \min\{Nt(X), Nt(Y)\}$. 2) In several classes of compact spaces, the Noetherian type is preserved by the operations of forming a square and of passing to a dense subspace. The Noetherian type of the Cantor Cube of weight $\aleph_ω$ with the countable box topology, $(2^{\aleph_ω})_δ$, is shown in Section 3 to be closely related to the combinatorics of covering collections of countable subsets of $\aleph_ω$. We discuss the influence of principles like $\square_{\aleph_ω}$ and Chang's conjecture for $\aleph_ω$ on this number and prove that it is not decidable in ZFC (relative to the consistency of ZFC with large cardinal axioms). Within PCF theory we establish the existence of an $(\aleph_4,\aleph_1)$-sparse covering family of countable subsets of $\aleph_ω$. From this follows an absolute upper bound of $\aleph_4$ on the Noetherian type of $(2^{\aleph_ω})_δ$. The proof uses ideas from Shelah's proof that if $κ^+
description: 22 pages. Replaced the old preprint with a new, substantially different version. The results regarding the Noetherian type of box products have been generalized, and there are a few entirely new results (see Example 3.4, Proposition 3.13 and Section 3.2.3)
Excitonic condensation for the surface states of topological insulator bilayers
Creators: name: Wang, Zhigang
name: Hao, Ningning
name: Fu, Zhen-Guo
name: Zhang, Ping
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose a generic topological insulator bilayer (TIB) system to study the excitonic condensation with self-consistent mean-field (SCMF) theory. We show that the TIB system presents the crossover behavior from the Bardeen-Cooper-Schrieffer (BCS) limit to Bose-Einstein condensation (BEC) limit. Moreover, by comparison with traditional semiconductor systems, we find that for the present system the superfluid property in the BEC phase is more sensitive to electron-hole density imbalance and the BCS phase is more robust. Applying this TIB model into Bi$_{2}$Se$_{3}$-family material, we find that the BEC phase is most probable to be observed in experiment. We also calculate the critical temperature for Bi$_{2}$Se$_{3}$-family TIB system, which is $\mathtt{\sim}100$ K. More interestingly, we can expect this relative high-temperature excitonic condensation since our calculated SCMF critical temperature is approximately equal to the Kosterlitz-Thouless transition temperature.
description: 11 NJP pages, 7 figures
Potential interactions among single nucleotide polymorphisms in bone- and cartilage-related genes in skeletal malocclusions
Creators: name: Calvano Küchler, Erika
name: Bitencourt Reis, Caio Luiz
name: Carelli, Julia
name: Proff, Peter
name: Kirschneck, Christian
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: bone, genes, malocclusion, polymorphisms
subject: 610 Medizin

description: Objective To investigate SNPs in bone‐ and cartilage‐related genes and their interaction in the aetiology of sagittal and vertical skeletal malocclusions. Settings and sample population This study included 143 patients and classified as follows: skeletal class I (n = 77), class II (n = 47) and class III (n = 19); maxillary retrusion (n = 39), protrusion (n = 52) and well‐positioned maxilla (n = 52); mandibular retrognathism (n = 50), prognathism (n = 50) and well‐positioned mandible (n = 43); normofacial (n = 72), dolichofacial (n = 55) and brachyfacial (n = 16). Materials and methods Steiner's ANB, SNA, SNB angles and Ricketts’ NBa‐PtGn angle were measured to determine the skeletal malocclusion and the vertical pattern. Nine SNPs in BMP2, BMP4, SMAD6, RUNX2, WNT3A and WNT11 were genotyped. Chi‐squared test was used to compare genotypes among the groups. Multifactor dimensionality reduction (MDR) and binary logistic regression analysis, both using gender and age as co‐variables, were also used. We performed Bonferroni correction for multiple testing. Results Significant associations at P < .05 were observed for SNPs rs1005464 (P = .042) and rs235768 (P = .021) in BMP2 with mandibular retrognathism and for rs59983488 (RUNX2) with maxillary protrusion (P = .04) as well as for rs708111 (WNT3A) with skeletal class III (P = .02; dominant model), rs1533767 (WNT11) with a brachyfacial skeletal pattern (P = .01, OR = 0.10; dominant model) and for rs3934908 (SMAD6) with prognathism (P = .02; recessive model). After the Bonferroni correction, none of the SNPs remained associated. The MDR predicted some interaction for skeletal class II, dolichofacial and brachyfacial phenotypes. Conclusion Our results suggest that SNPs in BMP2, BMP4, SMAD6, RUNX2, WNT3A and WNT11 could be involved in the aetiology of sagittal and vertical malocclusions.
A note on the axioms for Zilber's pseudo-exponential fields
Creators: name: Kirby, Jonathan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03C65

description: We show that Zilber's conjecture that complex exponentiation is isomorphic to his pseudo-exponentiation follows from the a priori simpler conjecture that they are elementarily equivalent. An analysis of the first-order types in pseudo-exponentiation leads to a description of the elementary embeddings, and the result that pseudo-exponential fields are precisely the models of their common first-order theory which are atomic over exponential transcendence bases. We also show that the class of all pseudo-exponential fields is an example of a non-finitary abstract elementary class, answering a question of Kesälä and Baldwin.
description: 10 pages, v2: substantial alterations
Effective Higgs Vertices in the generic MSSM
Creators: name: Crivellin, Andreas
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this article we consider chirally enhanced corrections to Higgs vertices in the most general MSSM. We include the contributions stemming from bilinear-terms, from the trilinear A-terms and their non-holomorphic analogues, the A'-terms, which couple squarks to the "wrong" Higgs field. We perform a consistent renormalization of the Higgs vertices beyond the decoupling limit M_SUSY->infinity, using a purely diagrammatic approach. The cancellation of the different contributions in and beyond the decoupling limit is discussed and the possible size of decoupling effects which occur if the SUSY particles are not much heavier than the electroweak-scale are examined. In the decoupling limit we recover the results obtained in the effective-field-theory approach. For the non-holomorphic A'-terms we find the well known $\tanβ$ enhancement in the down-sector similar to the one for terms proportional to mu. Due to the a priori generic flavor structure of these trilinear terms large flavour-changing neutral Higgs couplings can be induced. We also discover new tan(beta) enhanced contributions involving the usual holomorphic A-terms, which were not discussed before in the literature. These corrections occur only if also flavor-diagonal non-holomorphic corrections to the Higgs couplings are present. This reflects the fact that the A-terms, and also the chirality-changing self-energies, are physical quantities and cannot be absorbed into renormalization constants.
description: 17 pages, 5 figures, references added, figure added, version accepted for publication in PRD, typos corrected
Effect of internal electric fields on photoluminescence-detected magnetic resonance of π-conjugated polymer devices
Creators: name: Baird, Douglas L.
name: Nahlawi, Adnan
name: Crossley, Kenneth
name: Lupton, John M.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: optically detected magnetic resonance, photoluminescence, poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene], electric field effects
subject: 530 Physik

description: Electric fields are central to the operation of optoelectronic devices based on conjugated polymers as they drive the recombination of electrons and holes to excitons in organic light‐emitting diodes but are also responsible for the dissociation of excitons in solar cells. One way to track the microscopic effect of electric fields on charge carriers formed under illumination of a polymer film is to exploit the fluorescence arising from delayed recombination of carrier pairs, a process which is fundamentally spin dependent. Such spin‐dependent recombination can be probed directly in fluorescence, by optically detected magnetic resonance (ODMR). It is found that the ODMR signal in a polymer film is quenched in an electric field in the absence of a current, but that, at fields exceeding 1 MV cm−1, this quenching saturates at a level of at most 50%.
The intestinal epithelium during times of dynamic change : development and enteric infection
Creators: name: Bhinder, Ganive
Publisher: name: University of British Columbia
Year: 2017

description: Enteric infections and neonatal intestinal development both represent times of significant change in the intestine. Mode of delivery as well as food source, i.e. breast milk or formula, may impact later susceptibility to the development of allergies, asthma and other inflammatory diseases. Similarly, the development of pathological conditions such as irritable bowel syndrome and inflammatory bowel disease have been reported as long-term sequelae of infection by various enteric pathogens. The single cell layer of epithelial cells lining the intestine are in closest proximity to the luminal changes that occur, be it interaction with a bacterial pathogen or the introduction of breast milk. This positions intestinal epithelial cells (IEC)s to serve as key players in shaping responses during these times. To address the importance of IEC responses during enteric infections, we first examined the intricacies of IEC innate immune-mediated responses (MyD88-dependent) using in vivo models. Following infection with the common food poisoning pathogen Salmonella Typhimurium, IEC-specific MyD88 signalling was required to limit pathogen penetration of intestinal crypts and mediate goblet cell/antimicrobial responses. IECs lacking MyD88 also displayed decreased bactericidal capacity against Salmonella and Citrobacter rodentium, a close relative of enteropathogenic Escherichia coli. Thus, IEC MyD88 signalling promotes early, protective responses during enteric infection. Next, IEC changes during intestinal development, as well as the impact of food source during this process (i.e. mother’s milk versus formula) were explored using a neonate pup-in-a-cup model. Specifically, the role of milk fats found in mammalian milk (and currently not widely used in formulas), referred to as milk fat globule membrane (MFGM), were assessed for their ability to normalize intestinal development to that seen with mother’s milk. Interestingly, MFGM addition to formula resulted in similar villus and crypt development, as well as goblet cell, Paneth cell and enterocyte numbers and/or expression to that of mother’s milk fed pups. Further, addition of MFGM protected the formula fed neonate from intestinal damage by bacterial toxins. These studies highlight IECs as key players in shaping beneficial responses during enteric infection and intestinal development and have important implications for newborn health as well as for populations vulnerable to enteric infections.
Effects of Chameleon Scalar Field on Rotation Curves of the Galaxies
Creators: name: Burikham, Piyabut
name: Panpanich, Sirachak
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the effects of chameleon scalar field to the effective density and pressure of a dark matter halo. The pressure is generated from the chameleonic fifth force on the matter. We demonstrate that the thick-shell non-singular boundary condition which forbids singular point leads to extremely stringent constraint on the matter-chameleon coupling when applied to galaxy. We argue that chameleon profile with central singularity is more likely to develop in general physical situation. The chameleonic fifth force from the chameleon profile with central singularity experienced by the dark matter could significantly modify the rotation curve of galaxies. The chameleonic fifth force could generate steeper cusp to the rotation curves in any dark matter profiles starting from the Navarro-Frenk-White (NFW) to the pseudo-isothermal (ISO) profile. Upper limits on the coupling constant between the chameleon and the dark matter are estimated from observational data of the late-type Low-Surface-Brightness galaxies (LSB). It is in the order of $β< 10^{-3}$.
description: 26 pages, 13 figures, 1 table, extended version to include more viable self-potential and analytic solutions. To be published in IJMPD
Quantum permutation puzzles with indistinguishable particles
Creators: name: Lordi, Noah
name: Trank-Greene, Maedee
name: Kyle, Akira
name: Combes, Joshua
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Permutation puzzles, such as the Rubik's Cube and the 15 puzzle, are enjoyed by the general public and mathematicians alike. Here we introduce quantum versions of permutation puzzles where the pieces of the puzzles are replaced with indistinguishable quantum particles. The moves in the puzzle are achieved by swapping or permuting the particles. We show that simply permuting the particles can be mapped to a classical permutation puzzle, even though the identical particles are entangled. However, we obtain a genuine quantum puzzle by adding a quantum move: the square root of SWAP. The resulting puzzle cannot be mapped to a classical permutation puzzle. We focus predominately on the quantization of the $2\times 2$ slide puzzle and briefly treat the $2\times 2 \times 1$ Rubik's Cube.
description: 8 Pages + appendices, 6 Figures
Smoothing with application to stochastic fire growth modelling
Creators: name: Wang, Xi
Publisher: name: University of British Columbia
Year: 2017

description: Modelling wildland fire spread stochastically is an important way to incorporate the uncertainty associated with this phenomenon. Fitting such a model to data from remote-sensed images could be used to provide accurate fire spread risk maps. We study a particular model from this perspective. One objective of this thesis is to verify the model on data collected under experimentally controlled conditions. We present the analysis of data from small-scale experimental fires that were digitally recorded. Data extraction and processing methods and issues are discussed, along with an estimation methodology. A critical part of the estimation methodology revolves around the smoothing of observed counts of burning and burnt out pixels as functions of elapsed time. We employ nonparametric regression for this purpose and consider two bias reduction strategies as possible ways to obtain more accurate estimates of the parameters underlying the stochastic fire spread model. An argument for partial validation of the model is also provided.
Terahertz Magnetospectroscopy of Cyclotron Resonances from Topological Surface States in Thick Films of CdxHg1 – xTe
Creators: name: Otteneder, Maximilian
name: Sacré, Daniel
name: Yahniuk, Ivan
name: Diendorfer, Kilian
name: Dmitriev, Ivan A.
name: Ganichev, Sergey
Publisher: name: Universität Regensburg
Year: 2021
Subjects: subject: CdHgTe films, cyclotron resonances, magnetospectroscopy, surface states, terahertz, topological Volkov–Pankratov states
subject: 530 Physik

description: Herein, studies of the cyclotron resonance (CR) in thick Cd????Hg1−????Te films with different cadmium contents corresponding to materials with and without band inversion, as well as critical content corresponding to an almost linear energy dispersion are presented. The results demonstrate that the formation of 2D topological surface states requires sharp interfaces between layers with and without band inversion, in which case the corresponding CR is clearly observed for the out-of-plane orientation of magnetic field but does not show up for an in-plane orientation. In contrast, all samples having more conventional technological design with smooth interfaces (i.e., containing regions of Cd????Hg1−????Te with gradually changing Cd content x) show equally pronounced CR in both in-plane and out-of-plane magnetic field revealing that CR is excited in effectively 3D states. Modeling of the surface states for different film designs supports main observations. In all samples, additional broad helicity-independent resonances are observed, which are attributed to photoionization and magnetic freeze-out of impurity states.
Functionalization of Piperidine Derivatives for the Site Selective and Stereoselective Synthesis of Positional Analogs of Methylphenidate
Creators: name: Liu, Wenbin
name: Babl, Tobias
name: Röther, Alexander
name: Reiser, Oliver
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: C−H functionalization, diastereoselectivity, piperidines, regioselectivity, rhodium
subject: 540 Chemie

description: Rhodium‐catalyzed C−H insertions and cyclopropanations of donor/acceptor carbenes have been used for the synthesis of positional analogues of methylphenidate. The site selectivity is controlled by the catalyst and the amine protecting group. C−H functionalization of N‐Boc‐piperidine using Rh2(R‐TCPTAD)4, or N‐brosyl‐piperidine using Rh2(R‐TPPTTL)4 generated 2‐substitited analogues. In contrast, when N‐α‐oxoarylacetyl‐piperidines were used in combination with Rh2(S‐2‐Cl‐5‐BrTPCP)4, the C−H functionalization produced 4‐susbstiuted analogues. Finally, the 3‐substituted analogues were prepared indirectly by cyclopropanation of N‐Boc‐tetrahydropyridine followed by reductive regio‐ and stereoselective ring‐opening of the cyclopropanes.
Stokes factors and multilogarithms
Creators: name: Bridgeland, T.
name: Toledano-Laredo, V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: Let G be a complex, affine algebraic group and D a meromorphic connection on the trivial G-bundle over P^1, with a pole of order 2 at zero and a pole of order 1 at infinity. We show that the map S taking the residue of D at zero to the corresponding Stokes factors is given by an explicit, universal Lie series whose coefficients are multilogarithms. Using a non-commutative analogue of the compositional inversion of formal power series, we show that the same holds for the inverse of S, and that the corresponding Lie series coincides with the generating function for counting invariants in abelian categories constructed by D. Joyce.
description: final version, to appear in Crelle's journal. arXiv admin note: text overlap with arXiv:0801.3974
Compress-and-Forward Scheme for Relay Networks: Backword Decoding and Connection to Bisubmodular Flows
Creators: name: Raja, Adnan
name: Viswanath, Pramod
Publisher: name: arXiv
Year: 2010
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, a compress-and-forward scheme with backward decoding is presented for the unicast wireless relay network. The encoding at the source and relay is a generalization of the noisy network coding scheme (NNC). While it achieves the same reliable data rate as noisy network coding scheme, the backward decoding allows for a better decoding complexity as compared to the joint decoding of the NNC scheme. Characterizing the layered decoding scheme is shown to be equivalent to characterizing an information flow for the wireless network. A node-flow for a graph with bisubmodular capacity constraints is presented and a max-flow min-cut theorem is proved for it. This generalizes many well-known results of flows over capacity constrained graphs studied in computer science literature. The results for the unicast relay network are generalized to the network with multiple sources with independent messages intended for a single destination.
description: (updated to include layered/backward decoding; submitted revised version for review to IEEE transactions on Information Theory)
Hexamerization and thermostability emerged very early during geranylgeranylglyceryl phosphate synthase evolution
Creators: name: Kropp, Cosimo
name: Straub, Kristina
name: Linde, Mona
name: Babinger, Patrick
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: ancestral sequence reconstruction, enzyme, ether lipids, oligomerization, protein evolution, protein stability, thermostability
subject: 570 Biowissenschaften, Biologie

description: A large number of archaea live in hyperthermophilic environments. In consequence, their proteins need to adopt to these harsh conditions, including the enzymes that catalyze the synthesis of their membrane ether lipids. The enzyme that catalyzes the formation of the first ether bond in these lipids, geranylgeranylglyceryl phosphate synthase (GGGPS), exists as a hexamer in many hyperthermophilic archaea, and a recent study suggested that hexamerization serves for a fine‐tuning of the flexibility – stability trade‐off under hyperthermophilic conditions. We have recently reconstructed the sequences of ancestral group II GGGPS enzymes and now present a detailed biochemical characterization of nine of these predecessors, which allowed us to trace back the evolution of hexameric GGGPS and to draw conclusions about the properties of extant GGGPS branches that were not accessible to experiments up to now. Almost all ancestral GGGPS proteins formed hexamers, which demonstrates that hexamerization is even more widespread among the GGGPS family than previously assumed. Furthermore, all experimentally studied ancestral proteins showed high thermostability. Our results indicate that the hexameric oligomerization state and thermostability were present very early during the evolution of group II GGGPS, while the fine tuning of the flexibility – stability trade‐off developed very late, independent of the emergence of hexamerization.
Variational matrix product ansatz for dispersion relations
Creators: name: Haegeman, Jutho
name: Pirvu, Bogdan
name: Weir, David J.
name: Cirac, J. Ignacio
name: Osborne, Tobias J.
name: Verschelde, Henri
name: Verstraete, Frank
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A variational ansatz for momentum eigenstates of translation invariant quantum spin chains is formulated. The matrix product state ansatz works directly in the thermodynamic limit and allows for an efficient implementation (cubic scaling in the bond dimension) of the variational principle. Unlike previous approaches, the ansatz includes topologically non-trivial states (kinks, domain walls) for systems with symmetry breaking. The method is benchmarked using the spin-1/2 XXZ antiferromagnet and the spin-1 Heisenberg antiferromagnet and we obtain surprisingly accurate results.
description: Published version
Insurance asset allocation and regulatory compliance in the Moroccan context : analysis of the effects of proportions
Creators: name: Chaymaa Reghay
name: Abdelkader Salmi
name: Abdillah Kadouri
name: Otheman Nouisser
Publisher: name: Zenodo
Year: 2024

description: The implementation of Moroccan Solvency II is nearly completed. The draft circular on the new prudential framework for Risk-Based Solvency will result in higher capital requirements. The aim of this work is to optimize the asset allocation of an insurance company in the context of classical portfolio theory when the firm has to comply with new regulatory requirements in terms of market risk capital. The analysis begins with a brief examination of the basic Markowitz model and the standard formula as provided by the regulator. We then estimate the risk-return pairs for the main asset categories held by a Moroccan life insurer, which serves as our case study, and execute two optimization programs: one with no proportional constraints and the other with proportional constraints. Subsequently, we incorporate the capital charges covering market risk and execute two additional optimization programs. Our results exhibit significant differences in terms of returns. Models based on the new regulatory constraint prove to be more profitable than those based on classical theory. However, strategic adjustments are necessary to balance the level of capital and portfolio returns.
New flow observables
Creators: name: Bhalerao, Rajeev S.
name: Luzum, Matthew
name: Ollitrault, Jean-Yves
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Event-by-event fluctuations of the initial transverse density profile result in a collective flow pattern which also fluctuates event by event. We propose a number of new correlation observables to characterize these fluctuations and discuss how they should be analyzed experimentally. We argue that most of these quantities can be measured at RHIC and LHC.
description: For Quark Matter 2011 Proceedings. v2: Mistake in the Glauber calculation corrected after publication. Minor changes in Fig. 1. Text unchanged
Classical and quantum properties of a 2-sphere singularity
Creators: name: Helliwell, T. M.
name: Konkowski, D. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently Boehmer and Lobo have shown that a metric due to Florides, which has been used as an interior Schwarzschild solution, can be extended to reveal a classical singularity that has the form of a two-sphere. Here the singularity is shown to be a scalar curvature singularity that is both timelike and gravitationally weak. It is also shown to be a quantum singularity because the Klein-Gordon operator associated with quantum mechanical particles approaching the singularity is not essentially self-adjoint.
description: 10 pages, 1 figure, minor corrections, final version
MPEC 2023-H249 : 2023 HB7
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 HB7

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Complex structures on product of circle bundles over complex manifolds
Creators: name: Sankaran, Parameswaran
name: Thakur, Ajay Singh
Publisher: name: arXiv
Year: 2010
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32L05 (Primary) 32J18, 32Q55 (Secondary)

description: Let $\bar{L}_i\lr X_i$ be a holomorphic line bundle over a compact complex manifold for $i=1,2$. Let $S_i$ denote the associated principal circle-bundle with respect to some hermitian inner product on $\bar{L}_i$. We construct complex structures on $S=S_1\times S_2$ which we refer to as {\em scalar, diagonal, and linear types}. While scalar type structures always exist, the more general diagonal but non-scalar type structures are constructed assuming that $\bar{L}_i$ are equivariant $(\bc^*)^{n_i}$-bundles satisfying some additional conditions. The linear type complex structures are constructed assuming $X_i$ are (generalized) flag varieties and $\bar{L}_i$ negative ample line bundles over $X_i$. When $H^1(X_1;\br)=0$ and $c_1(\bar{L}_1)\in H^2(X_1;\br)$ is non-zero, the compact manifold $S$ does not admit any symplectic structure and hence it is non-Kähler with respect to {\em any} complex structure. We obtain a vanishing theorem for $H^q(S;\mathcal{O}_S)$ when $X_i$ are projective manifolds, $\bar{L}_i^\vee$ are very ample and the cone over $X_i$ with respect to the projective imbedding defined by $\bar{L}_i^\vee$ are Cohen-Macaulay. We obtain applications to the Picard group of $S$. When $X_i=G_i/P_i$ where $P_i$ are maximal parabolic subgroups and $S$ is endowed with linear type complex structure with `vanishing unipotent part' we show that the field of meromorphic functions on $S$ is purely transcendental over $\bc$.
description: 29 pages, To appear in Annales de L'Institut Fourier
Effect of Impurities in Description of Surface Nanobubbles
Creators: name: Das, Siddhartha
name: Snoeijer, Jacco H.
name: Lohse, Detlef
Publisher: name: arXiv
Year: 2010
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Surface nanobubbles emerging at solid-liquid interfaces of submerged hydrophobic surfaces show extreme stability and very small (gas-side) contact angles. In a recent study Ducker (W. A. Ducker, Langmuir 25, 8907 (2009).) conjectured that these effects may arise from the presence of impurities at the air-water interface of the nanobubbles. In this paper we present a quantitative analysis of this hypothesis by estimating the dependence of the contact angle and the Laplace pressure on the fraction of impurity coverage at the liquid-gas interface. We first develop a general analytical framework to estimate the effect of impurities (ionic or non-ionic) in lowering the surface tension of a given air-water interface. We then employ this model to show that the (gas-side) contact angle and the Laplace pressure across the nanobubbles indeed decrease considerably with an increase in the fractional coverage of the impurities, though still not sufficiently small to account for the observed surface nanobubble stability. The proposed model also suggests the dependencies of the Laplace pressure and the contact angle on the type of impurity.