cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Probabilistic MAC for Cognitive Radio Systems with Energy Harvesting Nodes
Creators: name: Ali, Ramy E.
name: Digham, Fadel F.
name: Seddik, Karim G.
name: Nafie, Mohammed
name: El-Keyi, Amr
name: Han, Zhu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we consider a cognitive radio (CR) system where the secondary user (SU) harvests energy from both the nature resources and the primary user (PU) radio frequency(RF) signal. We propose an energy-based probabilistic access scheme in which SU probabilistically accesses and senses the primary channel. The decision is based on the available energy and the PU's activity. We investigate the problem of maximizing the SU's success rate provided that the PU average quality of service (QoS) constraint is satisfied. We also assume multi-packet reception (MPR) capability and sensing errors under a Rayleigh fading channel. Numerical results show the effectiveness of the proposed probabilistic access scheme.
description: 5 pages, IEEE GlobalSIP 2014
GO_30, files from linear-scaling DFT and non-bonded parameters calculations
Creators: name: Pinto, Alexandre V.
Publisher: name: Zenodo
Year: 2022

description: Coordinates, topology, electron density cube file and files from Chargemol analysis for GO_30 obtained through Linear-Scaling Calculations in CP2K (check https://doi.org/10.1021/acs.jpcb.2c06037)
On finite-dimensional simple Poisson module on a certain Poisson algebra by using the specific Lie Structure method on Poisson maximal ideals
Creators: name: Nongkhran Sasom
Publisher: name: Faculty of Science, Ubon Ratchathani University
Year: 2023
Subjects: Poisson algebras
Poisson ideal
Poisson maximal ideal
Derived algebra
Poisson modules

description: Journal of Science and Science Education, 6, 1, 40-49
Engineering of betabellin 14D: Disulfide-induced folding of a β-sheet protein
Creators: name: Yan, Yibing
name: Erickson, Bruce W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1994

description: The betabellin target structure consists of 2 32-residue beta sheets packed against each other by hydrophobic interactions. We have designed, chemically synthesized, and biophysically characterized betabellin 14S, a single chain, and betabellin 14D, the disulfide-bridged double chain. The 32-residue nongenetic betabellin-14 chain (HSLTASIkaLTIHVQakTATCQVkaYTVHISE, a = D-Ala, k = D-Lys) has a palindromic pattern of polar (p), nonpolar (n), end (e), and beta-turn (t,r) residues (epnpnpnttnpnpnprrpnpnpnttnpnpnpe). Each half contains the same 14-residue palindromic pattern (underlined). Pairs of D-amino acid residues are used to favor formation of inverse-common (type-I') beta turns. In water at pH 6.5, the single chain of betabellin 14S is not folded, but the disulfide-linked betabellin 14D is folded into a stable beta-sheet structure. Thus, folding of the covalent dimer beta-bellin 14D is induced by formation of the single interchain disulfide bond. The binary pattern of alternating polar and nonpolar residues of its beta-sheets is not sufficient to induce folding. Betabellin 14D is a very water-soluble (10 mg/mL), small (64 residues), nongenetic (12 D residues) beta-sheet protein with properties (well-dispersed proton NMR resonances; Tm = 58 degrees C and delta Hm = 106 kcal/mol at pH 5.5) like those of a native protein structure.
Deep Learning for Simultaneous Inference of Hydraulic and Transport Properties
Creators: name: Zhou, Zitong
name: Zabaras, Nicholas
name: Tartakovsky, Daniel M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Identifying the heterogeneous conductivity field and reconstructing the contaminant release history are key aspects of subsurface remediation. Achieving these two goals with limited and noisy hydraulic head and concentration measurements is challenging. The obstacles include solving an inverse problem for high-dimensional parameters, and the high-computational cost needed for the repeated forward modeling. We use a convolutional adversarial autoencoder (CAAE) for the parameterization of the heterogeneous non-Gaussian conductivity field with a low-dimensional latent representation. Additionally, we trained a three-dimensional dense convolutional encoder-decoder (DenseED) network to serve as the forward surrogate for the flow and transport processes. Combining the CAAE and DenseED forward surrogate models, the ensemble smoother with multiple data assimilation (ESMDA) algorithm is used to sample from the Bayesian posterior distribution of the unknown parameters, forming a CAAE-DenseED-ESMDA inversion framework. We applied this CAAE-DenseED-ESMDA inversion framework in a three-dimensional contaminant source and conductivity field identification problem. A comparison of the inversion results from CAAE-ESMDA with physical flow and transport simulator and CAAE-DenseED-ESMDA is provided, showing that accurate reconstruction results were achieved with a much higher computational efficiency.
Clustering matrices through optimal permutations
Creators: name: Morone, Flaviano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Matrices are two-dimensional data structures allowing one to conceptually organize information. For example, adjacency matrices are useful to store the links of a network; correlation matrices are simple ways to arrange gene co-expression data or correlations of neuronal activities. Clustering matrix values into geometric patterns that are easy to interpret helps us to understand and explain the functional and structural organization of the system components described by matrix entries. Here we introduce a theoretical framework to cluster a matrix into a desired pattern by performing a similarity transformation obtained by solving a minimization problem named the optimal permutation problem. On the computational side, we present a fast clustering algorithm that can be applied to any type of matrix, including non-normal and singular matrices. We apply our algorithm to the neuronal correlation matrix and the synaptic adjacency matrix of the Caenorhabditis elegans nervous system by performing different types of clustering, including block-diagonal, nested, banded, and triangular patterns. Some of these clustering patterns show their biological significance in that they separate matrix entries into groups that match the experimentally known classification of C. elegans neurons into four broad categories, namely: interneurons, motor, sensory, and polymodal neurons.
description: 25 pages, 8 figures
Galaxy Formation and Reionization: Key Unknowns and Expected Breakthroughs by the James Webb Space Telescope
Creators: name: Robertson, Brant E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The scheduled launch of James Webb Space Telescope (JWST) in late 2021 marks a new start for studies of galaxy formation at high redshift z>~6 during the era of Cosmic Reionization. JWST can capture sensitive, high-resolution images and multi-object spectroscopy in the infrared that will transform our view of galaxy formation during the first billion years of cosmic history. This review summarizes our current knowledge of the role of galaxies in reionizing intergalactic hydrogen ahead of JWST, achieved through observations with Hubble Space Telescope and ground-based facilities including Keck, the Very Large Telescope, Subaru, and the Atacama Large Millimeter/Submillimeter Array. We identify outstanding questions in the field that JWST can address during its mission lifetime, including with the planned JWST Cycle 1 programs. (Abridged)
description: To appear in Annual Review of Astronomy and Astrophysics
Rational design of a three-heptad coiled-coil protein and comparison by molecular dynamics simulation with the GCN4 coiled coil: Presence of interior three-center hydrogen bonds
Creators: name: Tropsha, Alexander
name: Rozzelle, James E.
name: Erickson, Bruce W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1994

description: alpha-Helical coiled coils have a 7-residue repeating pattern (abcdefg) where a and d are usually hydrophobic. We have designed a 2-stranded 44-residue coiled-coil protein (P44) consisting of 2 22-residue alpha-helices linked by 2 terminal disulfide groups to test whether the disulfide bridges could stabilize a 3-heptad coiled coil. P44 should be stabilized by intrahelical hydrogen bonds, interhelical disulfide and salt bridges, and interior hydrophobic interactions. A computer model of P44 was built and its stability was studied by molecular dynamics simulation with explicit water. This doubly crosslinked 3-heptad coiled coil did not unfold during a 300-ps simulation with explicit water. This doubly crosslinked 3-heptad coiled coil did not unfold during a 300-ps simulation. But reduced P44 with 4 thiol groups did unfold. For comparison, the 62-residue crystal structure of the 4-heptad coiled coil of transcription activator GCN4 did not unfold during a 300-ps simulation. Thus P44 may be a stable folded protein in aqueous solution. These simulations revealed the presence of 2 local hydrogen bond networks involving intra-helical 3-center hydrogen bonds in the hydrophobic interior of the coiled coils of GCN4 and P44. The NH hydrogen at d makes a 3-center hydrogen bond whose major component is to the i - 4 C = O oxygen at g and minor component is to the solvent-inaccessible i - 3 C = O oxygen at a. Likewise, the NH hydrogen at g makes a 3-center hydrogen bond with the i - 4 C = O oxygen at c and the buried i - 3 C = O oxygen at d.
Counter-Rotating Accretion Discs
Creators: name: Dyda, Sergei
name: Lovelace, Richard V. E.
name: Ustyugova, Galina V.
name: Romanova, Marina M.
name: Koldoba, Alexander V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Counter-rotating discs can arise from the accretion of a counter-rotating gas cloud onto the surface of an existing co-rotating disc or from the counter-rotating gas moving radially inward to the outer edge of an existing disc. At the interface, the two components mix to produce gas or plasma with zero net angular momentum which tends to free-fall towards the disc center. We discuss high-resolution axisymmetric hydrodynamic simulations of a viscous counter-rotating disc for cases where the two components are vertically separated and radially separated. The viscosity is described by an isotropic $α-$viscosity including all terms in the viscous stress tensor. For the vertically separated components a shear layer forms between them. The middle of this layer free-falls to the disk center. The accretion rates are increased by factors $\sim 10^2-10^4$ over that of a conventional disc rotating in one direction with the same viscosity. The vertical width of the shear layer and the accretion rate are strongly dependent on the viscosity and the mass fraction of the counter-rotating gas. In the case of radially separated components where the inner disc co-rotates and the outer disc rotates in the opposite direction, a gap between the two components opens and closes quasi-periodically. The accretion rates are $\gtrsim 25$ times larger than those for a disc rotating in one direction with the same viscosity.
description: 11 pages, 13 figures, 1 table
Error Bounds for Extended Source Inversion applied to an Acoustic Transmission Inverse Problem
Creators: name: Symes, William W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 35R30

description: A simple inverse problem for the wave equation requires determination of both the wave velocity in a homogenous acoustic material and the transient waveform of an isotropic point radiator, given the time history of the wavefield at a remote point in space. The duration (support) of the source waveform and the source-to-receiver distance are assumed known. A least squares formulation of this problem exhibits the "cycle-skipping" behaviour observed in field scale problems of this type, with many local minima differing greatly from the global minimizer. An extended formulation, dropping the support constraint on the source waveform in favor of a weighted quadratic penalty, eliminates this misbehaviour. With proper choice of the weight operator, the velocity component at any local minimizer of this extended objective function differs from the global minimizer of the least-squares formulation by less than a linear combination of the source waveform support radius and data noise-to-signal ratio.
description: 21 pages, no figures. Introduction revised, with added references. Appendices A and B in previous version dropped. Several less central results removed. Typos corrected throughout
The Effects of Organizing Mathematics Learning Activities Based on Heuristics and Higher Order Questions on Mathematics Problem Solving Ability of Matthayomsuksa 5 Students
Creators: name: Pennapa Chaisirithawonkun
Publisher: name: Faculty of Science, Ubon Ratchathani University
Year: 2023
Subjects: Learning activities based on Heuristics
higher order questions
mathematical problem-solving ability

description: Journal of Science and Science Education, 6, 1, 50-62
Raiders of the lost SAR: Radiofrequency cycles of magnetic nanoflowers inside a tumor
Creators: name: Bruvera, I. J.
name: Actis, D. G.
name: Soto, P.
name: Blank, V.
name: Roguin, L.
name: van Raap, M. B. Fernandez
name: Zelis, P. Mendoza
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Radiofrequency magnetic cycles of \textit{ex vivo} melanoma tumor tissue loaded with Fe$_3$O$_4$ nanoflowers (NF) were measured for several field conditions and compared with the cycles of a ferrogel (FG) obtained incorporating identical NF in agarose gel. Results were studied in order to understand a reported specific power dissipation (SAR) reduction of the NF in the actual application medium (tumor) in comparison with a typical characterization model as the FG. The linearity of the response, together with coercive field and SAR values were analyzed.\\ Additionally, a novel method for the determination of the NF mean relaxation time is presented. Results show a systematic difference in magnetic response between the NF incorporated in the tumor and those in the FG for all field settings (\{98, 170, 260\} kHz and \{17.4, 54.0\} kA/m) with SAR reductions above 50\%.
Horizon growth of supermassive black hole seeds fed with collisional dark matter
Creators: name: Lora-Clavijo, F. D.
name: Gracia-Linares, M.
name: Guzman, F. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the accretion of collisional dark matter on a supermassive black hole seed. The analysis is based on the numerical solution of the fully coupled system of Einstein-Euler equations for spherically symmetric flow, where the dark matter is modeled as a perfect fluid that obeys an ideal gas equation of state. As the black hole actually grows, the accretion rate of dark matter corresponds to the black hole apparent horizon growth rate. We analyse cases with infall velocity as high as $0.5c$ and an environment density of $100M_{\odot}/\mathrm{pc}^3$, which are rather extreme conditions. Being the radial flux the maximum accretion case, our results show that the accretion of an ideal gas, eventually collisional dark matter, does not contribute significantly to SMBH masses. This result favors models predicting SMBHs were formed already with supermasses. We show that despite the fact that we are solving the full general relativistic system, for the parameter space studied our results are surprisingly similar to those obtained using the Bondi formula, which somehow certifies its use as a good approximation of a fully evolving space-time with spherical symmetry at short scales at least for dark matter densities. Additionally, we study the density profile of the gas and find that the presence of SMBHs redistributes the gas near the event horizon with a cuspy profile, whereas beyond a small fraction of a parsec it is not-cuspy anymore.
description: 11 pages, 6 eps figures, 3 tables. Accepted for publication in MNRAS
Sculpting proteins interactively: Continual energy minimization embedded in a graphical modeling system
Creators: name: Richardson, Jane S.
name: Brooks, Frederick P.
name: Richardson, David C.
name: Surles, Mark C.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1994

description: We describe a new paradigm for modeling proteins in interactive computer graphics systems--continual maintenance of a physically valid representation, combined with direct user control and visualization. This is achieved by a fast algorithm for energy minimization, capable of real-time performance on all atoms of a small protein, plus graphically specified user tugs. The modeling system, called Sculpt, rigidly constrains bond lengths, bond angles, and planar groups (similar to existing interactive modeling programs), while it applies elastic restraints to minimize the potential energy due to torsions, hydrogen bonds, and van der Waals and electrostatic interactions (similar to existing batch minimization programs), and user-specified springs. The graphical interface can show bad and/or favorable contacts, and individual energy terms can be turned on or off to determine their effects and interactions. Sculpt finds a local minimum of the total energy that satisfies all the constraints using an augmented Lagrange-multiplier method; calculation time increases only linearly with the number of atoms because the matrix of constraint gradients is sparse and banded. On a 100-MHz MIPS R4000 processor (Silicon Graphics Indigo), Sculpt achieves 11 updates per second on a 20-residue fragment and 2 updates per second on an 80-residue protein, using all atoms except non-H-bonding hydrogens, and without electrostatic interactions. Applications of Sculpt are described: to reverse the direction of bundle packing in a designed 4-helix bundle protein, to fold up a 2-stranded beta-ribbon into an approximate beta-barrel, and to design the sequence and conformation of a 30-residue peptide that mimics one partner of a protein subunit interaction. Computer models that are both interactive and physically realistic (within the limitations of a given force field) have 2 significant advantages: (1) they make feasible the modeling of very large changes (such as needed for de novo design), and (2) they help the user understand how different energy terms interact to stabilize a given conformation. The Sculpt paradigm combines many of the best features of interactive graphical modeling, energy minimization, and actual physical models, and we propose it as an especially productive way to use current and future increases in computer speed.
Strong-Field Perspective on High-Harmonic Radiation from Bulk Solids
Creators: name: Higuchi, Takuya
name: Stockman, Mark I.
name: Hommelhoff, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Mechanisms of high-harmonic generation from crystals are described by treating the electric field of a laser as a quasi-static strong field. Under the quasi-static electric field, electrons in periodic potentials form dressed states, known as Wannier-Stark states. The energy differences between the dressed states determine the frequencies of the radiation. The radiation yield is determined by the magnitudes of the inter-band and intra-band current matrix elements between the dressed states. The generation of attosecond pulses from solids is predicted. Ramifications for strong-field physics are discussed.
description: 5 pages, 2 figures
The Development of Professional Learning Community to Foster In-Service Science Teachers' Pedagogical Content Knowledge for Teaching Higher-Order Thinking (PCK for Teaching HOTs)
Creators: name: Chatree Faikhamta
Publisher: name: Faculty of Science, Ubon Ratchathani University
Year: 2023
Subjects: Professional Learning Community
Pedagogical Content Knowledge
Higher-order Thinking

description: Journal of Science and Science Education, 6, 1, 63-73
title: Impacts of climate change on Arctic sea-ice
Creators: name: Giles, Katharine
name: Keen, Ann
name: Hewitt, Helene
name: Laxon, Seymour
name: Bacon, Sheldon
name: Feltham, Daniel
name: Folland, Chris
name: Graham, Tim
name: Hawkins, Ed
name: Hodson, Daniel
name: Jackson, Laura
name: Keeley, Sarah
name: Menary, Matthew
name: Palmer, Matthew
name: Ridley, Jeff
name: Smith, Doug
name: Srokosz, Meric
name: West, Alex
name: Wood, Richard
Publisher: name: Marine Climate Change Impacts Partnership (MCCIP), Lowestoft, UK
Year: 2013

description: MCCIP Science Review 2013, 13-19
On coloring digraphs with forbidden induced subgraphs
Creators: name: Steiner, Raphael
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik
subject: directed graphs
subject: graph coloring
subject: Gyárfás–Sumner conjecture
subject: induced subgraphs

description: We prove a conjecture by Aboulker, Charbit, and Naserasr by showing that every oriented graph in which the out‐neighborhood of every vertex induces a transitive tournament can be partitioned into two acyclic induced subdigraphs. We prove multiple extensions of this result to larger classes of digraphs defined by a finite list of forbidden induced subdigraphs. We thereby resolve several special cases of an extension of the famous Gyárfás–Sumner conjecture to directed graphs stated by Aboulker et al.
Radio Emission of Pulsars. II. Coherence Catalyzed by Cerenkov-Unstable Shear Alfvén Waves
Creators: name: Thompson, Christopher
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This paper explores small-scale departures from force-free electrodynamics around a rotating neutron star, extending our treatment of resistive instability in a quantizing magnetic field. A secondary, Cerenkov instability is identified: relativistic particles flowing through thin current sheets excite propagating charge perturbations that are localized near the sheets. Growth is rapid at wavenumbers below the inverse ambient skin depth $k_{p,\rm ex}$. Small-scale Alfvénic wavepackets are promising sources of coherent curvature radiation. When the group Lorentz factor $γ_{\rm gr} \lesssim (k_{p,\rm ex}R_c)^{1/3} \sim 100$, where $R_c$ is the magnetic curvature radius, a fraction $\sim 10^{-3}$-$10^{-2}$ of the particle kinetic energy is radiated into the extraordinary mode at a peak frequency $\sim 10^{-2}ck_{p,\rm ex}$. Consistency with observations requires a high pair multiplicity ($\sim 10^{3-5}$) in the pulsar magnetosphere. Neither the primary, slow resistive instability nor the secondary, Alfvénic instability depend directly on the presence of magnetospheric `gaps', and may activate where the mean current is fully supplied by outward drift of the corotation charge. The resistive mode is overstable and grows at a rate comparable to the stellar spin frequency; the model directly accommodates strong pulse-to-pulse radio flux variations and coordinated subpulse drift. Alfvén mode growth can track the local plasma conditions, allowing for lower-frequency emission from the outer magnetosphere. Beamed radio emission from charged packets with $γ_{\rm gr} \sim 50-100$ also varies on sub-millisecond timescales. The modes identified here will be excited inside the magnetosphere of a magnetar, and may mediate Taylor relaxation of the magnetic twist.
description: 32 pages, 8 figures, Astrophysical Journal in press. Minor revisions to description of method
Bioactive Glasses in Periodontal Regeneration. A Systematic Review
Creators: name: Abushahba, Faleh
name: Närhi, Timo
name: Algahawi, Ahmed
name: Areid, Nagat
name: Hupa, Leena
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences
subject: Dentistry
subject: FOS: Clinical medicine
subject: Periodontics and Periodontology

description: A systematic review evaluating the use of bioactive glasses in periodontal bone defect regeneration against non-augmented defects or defects augmented using different bone augmentation materials.
Kelvin-Helmholtz Instability of Counter-Rotating Discs
Creators: name: Quach, Dan
name: Dyda, Sergei
name: Lovelace, Richard V. E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Observations of galaxies and models of accreting systems point to the occurrence of counter-rotating discs where the inner part of the disc ($r
Stability of yeast iso-1-ferricytochrome c as a function of pH and temperature
Creators: name: Pielak, Gary J.
name: Cohen, David S.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1994

description: Absorbance-detected thermal denaturation studies of the C102T variant of Saccharomyces cerevisiae iso-1-ferricytochrome c were performed between pH 3 and 5. Thermal denaturation in this pH range is reversible, shows no concentration dependence, and is consistent with a 2-state model. Values for free energy (delta GD), enthalpy (delta HD), and entropy (delta SD) of denaturation were determined as functions of pH and temperature. The value of delta GD at 300 K, pH 4.6, is 5.1 +/- 0.3 kcal mol-1. The change in molar heat capacity upon denaturation (delta Cp), determined by the temperature dependence of delta HD as a function of pH (1.37 +/- 0.06 kcal mol-1 K-1), agrees with the value determined by differential scanning calorimetry. pH-dependent changes in the Soret region indicate that a group or groups in the heme environment of the denatured protein, probably 1 or both heme propionates, ionize with a pK near 4. The C102T variant exhibits both enthalpy and entropy convergence with a delta HD of 1.30 kcal mol-1 residue-1 at 373.6 K and a delta SD of 4.24 cal mol-1 K-1 residue-1 at 385.2 K. These values agree with those for other single-domain, globular proteins.
title: Marine Climate Change Report Card 2013
Creators: name: MCCIP
Publisher: name: Marine Climate Change Impacts Partnership (MCCIP), Lowestoft, UK
Year: 2013

description: The 2013 MCCIP Report Card provides the very latest updates on our understanding of how climate change is affecting UK seas. Over 150 scientists from more than 50 leading science organisations contributed to this report card covering a wide range of topics ensuring that the information is timely, accurate and comprehensive.
description: MCCIP Report Card 2013
An analogue of Weyl's law for quantized irreducible generalized flag manifolds
Creators: name: Matassa, Marco
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We prove an analogue of Weyl's law for quantized irreducible generalized flag manifolds. By this we mean defining a zeta function, similarly to the classical setting, and showing that it satisfies the following two properties: as a functional on the quantized algebra it is proportional to the Haar state; its first singularity coincides with the classical dimension. The relevant formulae are given for the more general case of compact quantum groups.
description: 21 pages, comments are welcome
Systematic study of the $SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ local gauge symmetry
Creators: name: Benavides, Richard H.
name: Giraldo, Yithsbey
name: Muñoz, Luis
name: Ponce, William A.
name: Rojas, Eduardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review in a systematic way how anomaly free $SU(3)_c\otimes SU(3)_L\otimes U(1)_x$ models without exotic electric charges can be constructed, using as basis closed sets of fermions which includes each one the particles and antiparticles of all the electrically charged fields. Our analysis reproduce not only the known models in the literature, but also shows the existence of several more independent models for one and three families not considered so far. A phenomenological analysis of the new models is done, where the lowest limits at a 95\% CL on the gauge boson masses are presented.
description: 22 pages
Appendix A: Dust and loess as archives and agents of climate and climate change in the late Paleozoic Earth system
Creators: name: Soreghan, Gerilyn S.
name: Heavens, Nicholas G.
name: Pfeifer, Lily S.
name: Soreghan, Michael J.
Publisher: name: Geological Society of London
Year: 2022
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Reconstructing dust deposition from coal ash abundance and geochemistry
A rural laboratory in the Austrian alm—Tracing the contingent processes fostering social innovation at the local level
Creators: name: Stoustrup, Sune Wiingaard
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 300 Sozialwissenschaften::300 Sozialwissenschaften, Soziologie::303 Gesellschaftliche Prozesse
subject: 300 Sozialwissenschaften::300 Sozialwissenschaften, Soziologie::307 Gemeinschaften
subject: leader programme
subject: neoendogenous rural development
subject: regional development
subject: rural development
subject: social innovation

description: Abstract With social innovation being promoted to address the challenge of rural areas, there is a need to understand how processes of social innovation emerge and evolve at the local level. Rather than focusing on singular socially innovative projects, this article argues for an increased focus on how social innovation ecosystems and infrastructures are crucial for fostering and supporting the emergence of new perceptions, aims and practices. Using the metaphor of ‘laboratory’ as a conceptual frame to view rural development, the article outlines the emergence and long‐term evolution of social innovation at the local level with a case study from the Austrian region of Mühlviertel and demonstrates how changes in perceptions and new ideas for local development are institutionalised and linked with intra‐regional governance networks in a temporally contingent process linking incremental and radical social innovations.
Pseudotorsional OCCO backbone angle as a single descriptor of protein secondary structure
Creators: name: Singh, Raj K.
name: Tropsha, Alexander
name: Laiter, Sergei
name: Vaisman, Iosif I.
name: Hoffman, Doug L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1995

description: Protein secondary structure is conventionally identified using characteristic ranges of two backbone torsional angles phi and psi. We suggest that the secondary structure can be adequately characterized by a single descriptor, the Oi-1Ci-1CiOi (where i is the residue number) pseudotorsional backbone angle. A set of 102 structurally distinct protein chains from the Protein Data Bank was used to evaluate the adequacy of this descriptor. We find that a specific range of OCCO angles corresponds to each major secondary structure. The complete range of OCCO angles (-180 degrees to 179 degrees) was broken into 18 consecutive subranges of 20 degrees each, and each subrange was assigned a letter. Thus, the OCCO profiles for each protein in the database were "translated" into a sequence of letters. The Needleman-Wunsch primary sequence alignment algorithm was then used for secondary/tertiary structure comparison and alignment. Preliminary results indicate that this new approach has a significant potential for rapid identification of fold families in the Protein Data Bank.
بررسی اثربخشی الگوی تدریس چرخه ای ۹مرحله ای (9E) در تدریس علوم بر درک مفهومی و انگیزش تحصیلی دانش آموزان
Publisher: name: دانشگاه کردستان
Year: 2022

description: هدف پژوهش حاضر، تعیین اثربخشی الگوی تدریس چرخه ای9مرحله ای (9ای )در تدریس علوم بر درک\nمفهومی و انگیزش تحصیلی بوده است. روش پژوهش از نوع نیمه آزمایشی بود که در اجرای آن از طرح پیش\nآزمون-پس آزمون با گروه کنترل استفاده شد. جامعه آماری شامل کلیه دانش آموزان پسر پایه پنجم ابتدایی\nاستان آذربایجان غربی؛ شهرستان خوی در سال تحصیلی 6146-6144 بود که از بین آنها14دانش آموز به\nروش نمونه گیری خوشه ای انتخاب شد و در دو گروه آزمایش و کنترل گمارده شدند. ابزارهای پژوهش شامل\nآزمون درک مفهومی معلم ساخته و پرسشنامه انگیزش تحصیلی هارتر بود که همه ی آزمودنی های گروه\nآزمایش و کنترل، قبل و بعد از آموزش با استفاده از آزمون درک مفهومی معلم ساخته و پرسشنامه انگیزش\nتحصیلی مورد ارزیابی قرار گرفتند. آزمودنی های گروه آزمایش به مدت دوازده جلسه تدریس 11دقیقه ای\nالگوی تدریس چرخه ای 9مرحله ای (9ای )در درس علوم را دریافت کردند. گروه کنترل نیز همزمان روش\nتدریس سنتی )معمول( را دریافت کردند. تجزیه وتحلیل داده ها با روش ها و تکنیک های آماری توصیفی و\nاستنباطی مختلف ازجمله روش های آماری میانگین، انحراف استاندارد، تحلیل کواریانس و با استفاده از نرم\nافزار اس.پی.اس.اس26 انجام شد. یافته ها نشانگر تأثیر مثبت الگوی تدریس چرخه ای 9مرحله ای (ای9 )بر درک\nمفهومی و انگیزش تحصیلی دانش آموزان بود که منجر به بهبود معنیدار درک مفهومی و انگیزش تحصیلی\nگروه آزمایش در مقایسه با گروه کنترل شده است
Serum immune responses to group A streptococcal antigens following pharyngeal acquisitions among children in Cape Town, South Africa [Supplementary data].
Creators: name: Engel, Mark
name: Salie, Taariq
Publisher: name: University of Cape Town
Year: 2022
Subjects: Immunology not elsewhere classified
Medical microbiology not elsewhere classified

description: Supplementary materials to the following publication:
 Salie MT, et al. Serum immune responses to group A streptococcal antigens following pharyngeal acquisitions among children in Cape Town, South Africa. mSphere 2022 (submitted).
 This document contains additional information with respect to the symptoms from participants enrolled into the longitudinal study evaluating immune responses in Cape Town children. Also, GAS isolates' characteristics are provided.
Electroreduction of CO2 on Au(310)@Cu High‐index Facets
Creators: name: Liang, Liang
name: Feng, Quanchen
name: Wang, Xingli
name: Hübner, Jessica
name: Gernert, Ulrich
name: Heggen, Marc
name: Wu, Longfei
name: Hellmann, Tim
name: Hofmann, Jan P.
name: Strasser, Peter
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::660 Chemische Verfahrenstechnik::660 Chemische Verfahrenstechnik
subject: electromethanation
subject: high-index Cu facets
subject: Operando Fourier Transform Infrared Spectroscopy

description: The chemical selectivity and faradaic efficiency of high‐index Cu facets for the CO2 reduction reaction (CO2RR) is investigated. More specifically, shape‐controlled nanoparticles enclosed by Cu {hk0} facets are fabricated using Cu multilayer deposition at three distinct layer thicknesses on the surface facets of Au truncated ditetragonal nanoprisms (Au DTPs). Au DTPs are shapes enclosed by 12 high‐index {310} facets. Facet angle analysis confirms DTP geometry. Elemental mapping analysis shows Cu surface layers are uniformly distributed on the Au {310} facets of the DTPs. The 7 nm Au@Cu DTPs high‐index {hk0} facets exhibit a CH4 : CO product ratio of almost 10 : 1 compared to a 1 : 1 ratio for the reference 7 nm Au@Cu nanoparticles (NPs). Operando Fourier transform infrared spectroscopy spectra disclose reactive adsorbed *CO as the main intermediate, whereas CO stripping experiments reveal the high‐index facets enhance the *CO formation followed by rapid desorption or hydrogenation.
بررسی تأثیر تدریس معادلات دیفرانسیل بر اساس رویکرد مدل سازی در عملکرد حل مسئله دانشجویان فنی و مهندسی
Publisher: name: دانشگاه کردستان
Year: 2022

description: هدف: مدل سازی ریاضی که فرآیند دوسویه ترجمه بین مسائل دنیای واقعی و ریاضیات است، میتواند برای\nایجاد انگیزه، رشد توانمندیهای شناختی و ارتقاء توانایی انتقال دانش ریاضی به حوزه های دیگر همچون علوم\nمهندسی به کار رود. این پژوهش با هدف بررسی تأثیر تدریس معادلات دیفرانسیل بر اساس رویکرد مدل سازی\nدر عملکرد حل مسئله دانشجویان فنی و مهندسی در مقایسه با تدریس سنتی انجام پذیرفت\nروش: در این پژوهش از روش شبه آزمایشی با طرح پیش آزمون-پس آزمون با گروه کنترل استفاده شد\nدانشجویان دانشکده فنی و مهندسی واحد تهران مرکزی دانشگاه آزاد اسلامی جامعه آماری این پژوهش را\nتشکیل دادند. نمونه آماری در دسترس و شامل دو گروه هر یک با 33 دانشجوی مهندسی بود. معادلات\nدیفرانسیل مرتبه اول تفکیک پذیر، خطی و همگن در گروه آزمایش با رویکرد مدل سازی و در گروه کنترل به\nروش سنتی تدریس شد. تلفیقی از نتایج آزمون تعیین سطح ریاضی عمومی و پیش آزمون مدل سازی به عنوان\nمتغیر مداخله گر در آزمون تحلیل کوواریانس به کار گرفته شد\nیافته ها: داده های مستخرج از آزمون ها با نرم افزار اس.پی.اس.اس.نسخه 26 تحلیل شد. نتایج این پژوهش نشان میدهد\nکه تدریس معادلات دیفرانسیل بر اساس رویکرد مدل سازی علاوه بر افزایش توانمندی به کارگیری دانش ریاضی\nدر حوزه های مهندسی، به صورت معناداری می تواند عملکرد حل مسئله دانشجویان را بهبود بخشد
In Situ Detection of Iron in Oxidation States ≥ IV in Cobalt‐Iron Oxyhydroxide Reconstructed during Oxygen Evolution Reaction
Creators: name: Reith, Lukas
name: Hausmann, Jan Niklas
name: Mebs, Stefan
name: Mondal, Indranil
name: Dau, Holger
name: Driess, Matthias
name: Menezes, Prashanth W.
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaften::620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
subject: bimetallic electrocatalysts
subject: in situ spectroscopy
subject: layered double hydroxides
subject: precatalysts
subject: redox noninnocent oxo ions

description: Cobalt‐iron oxyhydroxides (CoFeOOHx) are among the most active catalysts for the oxygen evolution reaction (OER). However, their redox behavior and the electronic and chemical structure of their active sites are still ambiguous. To shed more light on this, the complete and rapid reconstruction of four helical cobalt‐iron borophosphates with different Co:Fe ratios into disordered cobalt‐iron oxyhydroxides can be achieved, which are electrolyte‐penetrable and thus most transition metal sites can potentially participate in the OER. To track the redox behavior and to identify the active structure, quasi in situ X‐ray absorption spectroscopy is applied. Iron in high oxidation states ≥ IV (Fe4+) and its substantial redox behavior with an average oxidation state of around 2.8 to above 3.2 is detected. Furthermore, a 6% contraction of the Fe‐O bond length compared to Fe3+OOH references is observed during OER and a strong distortion of the [MO6] octahedra is identified. It is hypothesized that this bond contraction is caused by the presence of oxyl radicals and that di‐µ‐oxyl radical bridged cobalt‐iron centers are the active sites. It is anticipated that the detailed electronic and structural description can substantially contribute to the debate on the nature of the active site in bimetallic iron‐containing OER catalysts.
Purification and crystallization of cyclin-dependent kinase inhibitor p21
Creators: name: Nichols, Michael A.
name: Xiong, Yue
name: Mayrose, Dale R.
name: Ke, Hengming
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1996

description: p21, a universal inhibitor of mammalian cyclin-dependent kinases (CDK), regulates cell cycle progression by forming various distinct protein complexes with cyclins, CDKs, and the proliferating cell nuclear antigen. We have overexpressed recombinant human p21 in E. coli and purified active p21 to near homogeneity on a large scale. Crystals of recombinant p21 have been grown in the space group P2(1) a = 157.4, b = 152.7, c = 90.6 A, and beta = 92.7 degrees. The diffraction data of the recombinant p21 have been collected to 2.5 and 3.5 A resolution for the native crystal and two heavy atom derivatives of mercury and iridium.
Justification of the KP-II approximation in dynamics of two-dimensional FPU systems
Creators: name: Hristov, Nikolay
name: Pelinovsky, Dmitry E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Dynamics of the Fermi-Pasta-Ulam (FPU) system on a two-dimensional square lattice is considered in the limit of small-amplitude long-scale waves with slow transverse modulations. In the absence of transverse modulations, dynamics of such waves, even at an oblique angle with respect to the square lattice, is known to be described by the Korteweg-de Vries (KdV) equation. For the three basic directions (horizontal, vertical, and diagonal), we prove that the modulated waves are well described by the Kadomtsev-Petviashvili (KP-II) equation. The result was expected long ago but proving rigorous bounds on the approximation error turns out to be complicated due to the nonlocal terms of the KP-II equation and the vector structure of the FPU systems on two-dimensional lattices. We have obtained these error bounds by extending the local well-posedness result for the KP-II equation in Sobolev spaces and by controlling the error terms with energy estimates. The bounds are useful in the analysis of transverse stability of solitary and periodic waves in two-dimensional FPU systems due to many results available for the KP-II equation.
description: 30 pages, 2 figures
Statistical significance of hierarchical multi-body potentials based on Delaunay tessellation and their application in sequence-structure alignment
Creators: name: Munson, Peter J.
name: Singh, Raj K.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1997

description: Statistical potentials based on pairwise interactions between C alpha atoms are commonly used in protein threading/fold-recognition attempts. Inclusion of higher order interaction is a possible means of improving the specificity of these potentials. Delaunay tessellation of the C alpha-atom representation of protein structure has been suggested as a means of defining multi-body interactions. A large number of parameters are required to define all four-body interactions of 20 amino acid types (20(4) = 160,000). Assuming that residue order within a four-body contact is irrelevant reduces this to a manageable 8,855 parameters, using a nonredundant dataset of 608 protein structures. Three lines of evidence support the significance and utility of the four-body potential for sequence-structure matching. First, compared to the four-body model, all lower-order interaction models (three-body, two-body, one-body) are found statistically inadequate to explain the frequency distribution of residue contacts. Second, coherent patterns of interaction are seen in a graphic presentation of the four-body potential. Many patterns have plausible biophysical explanations and are consistent across sets of residues sharing certain properties (e.g., size, hydrophobicity, or charge). Third, the utility of the multi-body potential is tested on a test set of 12 same-length pairs of proteins of known structure for two protocols: Sequence-recognizes-structure, where a query sequence is threaded (without gap) through the native and a non-native structure; and structure-recognizes-sequence, where a query structure is threaded by its native and another non-native sequence. Using cross-validated training, protein sequences correctly recognized their native structure in all 24 cases. Conversely, structures recognized the native sequence in 23 of 24 cases. Further, the score differences between correct and decoy structures increased significantly using the three- or four-body potential compared to potentials of lower order.
Fractional Quantum Hall Effect and Wigner Crystal of Two-Flux Composite Fermions
Creators: name: Liu, Yang
name: Kamburov, D.
name: Hasdemir, S.
name: Shayegan, M.
name: Pfeifer, L. N.
name: West, K. W.
name: Baldwin, K. W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In two-dimensional electron systems confined to GaAs quantum wells, as a function of either tilting the sample in magnetic field or increasing density, we observe multiple transitions of the fractional quantum Hall states (FQHSs) near filling factors $ν=3/4$ and 5/4. The data reveal that these are spin-polarization transitions of interacting two-flux composite Fermions, which form their own FQHSs at these fillings. The fact that the reentrant integer quantum Hall effect near $ν=4/5$ always develops following the transition to full spin polarization of the $ν=4/5$ FQHS strongly links the reentrant phase to a pinned \emph{ferromagnetic} Wigner crystal of two-flux composite Fermions.
Baseline length and automated fitting of denaturation data
Creators: name: Pielak, Gary J.
name: Allen, Devon L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1998

description: To understand relationships between protein sequence and stability, we often compare data from proteins that differ by the substitution of one amino acid. Frequently, an amino acid change causes the cooperative denaturation transitions to shift to lower temperatures, diminishing the signal from the native state. Here we show that apparent stability changes, i.e., the free energy of denaturation, deltaGD, can also be caused by a deficiency of points in the low temperature end of the transition. In addition, we suggest a method for overcoming this problem.
تبیین ادراک مدرسان مجرب از فلسفه تدریس مشارکتی با رویکرد پدیدارشناسانه
Publisher: name: دانشگاه کردستان
Year: 2022

description: هدف: پژوهش حاضر به دنبال تبیین ادراک مدرسان مجرب از فلسفه تدریس مشارکتی به هدف پاسخ گویی به سؤال زیر است: با نظر به ادراک مدرسان مجرب تدریس مشارکتی چه ماهیتی دارد؟روش: روش پژوهش از نوع پدیدارشناسی بوده و جامعه آماری آن شامل اساتید دانشگاه خوارزمی تهران ، دانشگاه تبریز، دانشگاه فرهنگیان تبریز و تعدادی از نخبگان کشوری که  چندین سال تجربه تدریس مشارکتی داشتند با نمونه گیری هدفمند انتخاب شدند. برای جمع آوری داده ها از  ابزار مصاحبه نیمه سازمان یافته استفاده شد و تا زمان اشباع داده ها مجموع 19 مصاحبه انجام شد که از این تعداد 4 مصاحبه جزء مصاحبه­ های تکمیلی و برای تعمیق و اشباع بیشتر داده ها انجام گرفت. پس از ضبط مصاحبه، متن آن ها تهیه شد.برای مدیریت و کدگذاری داده ها از نرم افزار(مکس کیو دی ای 10) و برای تجزیه وتحلیل داده ها از روش کلایزی استفاده گردید\nیافته ها: نتایج حاصل از ادراک مصاحبه شوندگان از ماهیت فلسفه تدریس مشارکتی منجر به شناسایی چند تعریف، آگاهی از فلسفه آن، و ویژگی های از جمله تعاملی بودن، پویایی، جذابیت، استفاده از خرد جمعی، غنی سازی منابع، تسهیل یادگیری و تفهیم بهتر و همچنین ابعاد و عناصری برای تدریس مشارکتی گردید
The Effect of Using STEM education integrated Engineering thinking Online Learning on Innovative Thinking Skill of Grade 7 Students Wat Phrasrimahadhat Secondary Demonstration School
Creators: name: Duangjai Showtale
Publisher: name: Faculty of Science, Ubon Ratchathani University
Year: 2023
Subjects: Online Learning
STEM Education
Engineering Thinking
Innovative Thinking Skill

description: Journal of Science and Science Education, 6, 1, 74-90