cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum-to-Classical Correspondence and Hubbard-Stratonovich Dynamical Systems, a Lie-Algebraic Approach
Creators: name: Galitski, Victor
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a Lie-algebraic duality approach to analyze non-equilibrium evolution of closed dynamical systems and thermodynamics of interacting quantum lattice models (formulated in terms of Hubbard-Stratonovich dynamical systems). The first part of the paper utilizes a geometric Hilbert-space-invariant formulation of unitary time-evolution, where a quantum Hamiltonian is viewed as a trajectory in an abstract Lie algebra, while the sought-after evolution operator is a trajectory in a dynamic group, generated by the algebra via exponentiation. The evolution operator is uniquely determined by the time-dependent dual generators that satisfy a system of differential equations, dubbed here dual Schrodinger-Bloch equations, which represent a viable alternative to the conventional Schrodinger formulation. These dual Schrodinger-Bloch equations are derived and analyzed on a number of specific examples. It is shown that deterministic dynamics of a closed classical dynamical system occurs as action of a symmetry group on a classical manifold and is driven by the same dual generators as in the corresponding quantum problem. This represents quantum-to-classical correspondence. In the second part of the paper, we further extend the Lie algebraic approach to a wide class of interacting many-particle lattice models. A generalized Hubbard-Stratonovich transform is proposed and it is used to show that the thermodynamic partition function of a generic many-body quantum lattice model can be expressed in terms of traces of single-particle evolution operators governed by the dynamic Hubbard-Stratonovich fields. Finally, we derive Hubbard-Stratonovich dynamical systems for the Bose-Hubbard model and a quantum spin model and use the Lie-algebraic approach to obtain new non-perturbative dual descriptions of these theories.
description: 25 pages, 1 figure; v2: citations added
Letter from Mabel Lang to Emmett L. Bennett Jr., September 17, 1962
Creators: name: Lang, Mabel
Publisher: name: The University of Texas at Austin
Year: 1962
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--Mabel Lang
Linear B

description: Lang lists the total number of places, men, and animals in different tablet fragments and explains their significance. She also mentions how her restoration of a sign in tablet 719 still holds weight in the print.
Spectral functions for single- and multi-Impurity models using DMRG
Creators: name: Peters, Robert
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: This article focuses on the calculation of spectral functions for single- and multi-impurity models using the density matrix renormalization group (DMRG). To calculate spectral functions from DMRG, the correction vector method is presently the most widely used approach. One, however, always obtains Lorentzian convoluted spectral functions, which in applications like the dynamical mean-field theory can lead to wrong results. In order to overcome this restriction we show how to use the Lehmann formula to calculate a peak spectrum for the spectral function. We show that this peak spectrum is a very good approximation to a deconvolution of the correction vector spectral function. Calculating this deconvoluted spectrum directly from the DMRG basis set and operators is the most natural approach, because it uses only information from the system itself. Having calculated this excitation spectrum, one can use an arbitrary broadening to obtain a smooth spectral function, or directly analyze the excitations. As a nontrivial test we apply this method to obtain spectral functions for a model of three coupled Anderson impurities. Although, we are focusing in this article on impurity models, the proposed method for calculating the peak spectrum can be easily adapted to usual lattice models.
description: 11 pages, 14 figures
How do they see it? Family physicians' perspectives on and experiences of continuing professional development
Creators: name: Barrows, Jennifer Alison
Publisher: name: University of British Columbia
Year: 2017

description: Continuing professional development (CPD) is important for family physicians due to the complex and continually evolving nature of family practice. Family physicians need to keep abreast of scientific advances and current best practices in order to practice competently and effectively. As with many professions, family physicians are required to demonstrate participation in continuing professional development (CPD). Research suggests that organized CPD varies in the extent to which it influences physicians’ practice. This study aimed to advance understanding of the complexities surrounding the role of CPD in family practice by examining family physicians’ perspectives on and experiences of CPD. A mixed-method approach, incorporating a self-report survey and semi-structured interviews, investigated: (a) family physicians’ participation in organized CPD; (b) family physicians’ reasons, or motivations, for participating in organized CPD; (c) the relationship between family physicians’ motivation for CPD and their organized CPD participation; and (d) factors that influence family physicians’ motivation for and organized participation in CPD. Self-determination theory (SDT) was used as a sensitizing lens, providing relevant conceptual categories for interpreting family physicians’ reasons for participating in CPD. Ninety-one family physicians completed a self-report survey and six of these participated in in-depth, semi-structured interviews. Overall, participants valued CPD and viewed it as important to practice. SDT concepts helped to create a more nuanced portrait of family physicians’ motivation for learning and CPD than reflected in previous studies. Six overarching themes captured participants’ motivations for, participation in, and experiences of organized CPD: Maintaining Competence, Connection to Colleagues, Me as a Learner, Opinions on the ‘CPD System’, Practicalities of Participation, and Links to Informal Learning and Practice. Relevance to research and practice are discussed.
Dynamic Semicrystalline Networks of Polypropylene with Thiol-Anhydride Exchangeable Crosslinks.
Creators: name: Saed, Mohand O
name: Lin, Xueyan
name: Terentjev, Eugene M
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Polypropylene
Thermoplastic
3D Printing
Plastic Recycling
Vitrimer
Thiol-anhydrate
Thiol-thioester

description: Thermoplastic polyolefins (TPOs) crosslinked by dynamic covalent bonds (xTPOs) have the potential to be the most utilized class of polymer in the world, with applications ranging from household and automotive to biomedical devices and additive manufacturing. xTPO combines the benefits of thermoplastics and thermosets in a "single material" and potentially avoids their shortcomings. Here, we describe a new two-stage reaction extrusion strategy of TPOs with a backbone consisting of inert C-C bonds (polypropylene, PP), and thiol-anhydride, to dynamically crosslink PP through thiol-thioester bond exchange. The degree of PP crosslinking determines the rubber plateau modulus above the melting point of the plastic: the modulus at 200 °C increases from zero in the melt to 23 kPa at 6% crosslinking, to 60 kPa at 20%, to 105 kPa at 40%. The overall mechanical strength of the solid xTPO plastic is 25% higher compared to the original PP, and the gel fraction of xTPO reaches 55%. Finally, we demonstrate that the crosslinked xTPO material is readily reprocessable (recycled, remolded, rewelded, and 3D printed).
Letter from John L. Heller to Emmett L. Bennett Jr., January 16, 1960
Creators: name: Heller, John L.
Publisher: name: The University of Texas at Austin
Year: 1960
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--John L. Heller

description: Heller thanks Bennett for a helpful reply to one of his letters and responds to it.
Do Mass Spectrometry-Derived Metabolomics Improve the Prediction of Pregnancy-Related Disorders? Findings from a UK Birth Cohort with Independent Validation.
Creators: name: McBride, Nancy
name: Yousefi, Paul
name: Sovio, Ulla
name: Taylor, Kurt
name: Vafai, Yassaman
name: Yang, Tiffany
name: Hou, Bo
name: Suderman, Matthew
name: Relton, Caroline
name: Smith, Gordon C S
name: Lawlor, Deborah A
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Prediction
Pregnancy
Metabolites
Mass spectrometry
Metabolomics

description: Many women who experience gestational diabetes (GDM), gestational hypertension (GHT), pre-eclampsia (PE), have a spontaneous preterm birth (sPTB) or have an offspring born small/large for gestational age (SGA/LGA) do not meet the criteria for high-risk pregnancies based upon certain maternal risk factors. Tools that better predict these outcomes are needed to tailor antenatal care to risk. Recent studies have suggested that metabolomics may improve the prediction of these pregnancy-related disorders. These have largely been based on targeted platforms or focused on a single pregnancy outcome. The aim of this study was to assess the predictive ability of an untargeted platform of over 700 metabolites to predict the above pregnancy-related disorders in two cohorts. We used data collected from women in the Born in Bradford study (BiB; two sub-samples, n = 2000 and n = 1000) and the Pregnancy Outcome Prediction study (POPs; n = 827) to train, test and validate prediction models for GDM, PE, GHT, SGA, LGA and sPTB. We compared the predictive performance of three models: (1) risk factors (maternal age, pregnancy smoking, BMI, ethnicity and parity) (2) mass spectrometry (MS)-derived metabolites (n = 718 quantified metabolites, collected at 26-28 weeks' gestation) and (3) combined risk factors and metabolites. We used BiB for the training and testing of the models and POPs for independent validation. In both cohorts, discrimination for GDM, PE, LGA and SGA improved with the addition of metabolites to the risk factor model. The models' area under the curve (AUC) were similar for both cohorts, with good discrimination for GDM (AUC (95% CI) BiB 0.76 (0.71, 0.81) and POPs 0.76 (0.72, 0.81)) and LGA (BiB 0.86 (0.80, 0.91) and POPs 0.76 (0.60, 0.92)). Discrimination was improved for the combined models (compared to the risk factors models) for PE and SGA, with modest discrimination in both studies (PE-BiB 0.68 (0.58, 0.78) and POPs 0.66 (0.60, 0.71); SGA-BiB 0.68 (0.63, 0.74) and POPs 0.64 (0.59, 0.69)). Prediction for sPTB was poor in BiB and POPs for all models. In BiB, calibration for the combined models was good for GDM, LGA and SGA. Retained predictors include 4-hydroxyglutamate for GDM, LGA and PE and glycerol for GDM and PE. MS-derived metabolomics combined with maternal risk factors improves the prediction of GDM, PE, LGA and SGA, with good discrimination for GDM and LGA. Validation across two very different cohorts supports further investigation on whether the metabolites reflect novel causal paths to GDM and LGA.
Opto-mechanical transducers for long-distance quantum communication
Creators: name: Stannigel, K.
name: Rabl, P.
name: Sørensen, A. S.
name: Zoller, P.
name: Lukin, M. D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We describe a new scheme to interconvert stationary and photonic qubits which is based on indirect qubit-light interactions mediated by a mechanical resonator. This approach does not rely on the specific optical response of the qubit and thereby enables optical quantum interfaces for a wide range of solid state spin and charge based systems. We discuss the implementation of quantum state transfer protocols between distant nodes of a large scale network and evaluate the effect of the main noise sources on the resulting state transfer fidelities. For the specific examples of electronic spin qubits and superconducting charge qubits we show that high fidelity quantum communication protocols can be implemented under realistic experimental conditions.
description: Version as accepted by PRL
A graph theoretic approach to graded identities for matrices
Creators: name: Haile, Darrell
name: Natapov, Michael
Publisher: name: arXiv
Year: 2011
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16S35, 16R10, 05C30, 05C45

description: We consider the algebra M_k(C) of k-by-k matrices over the complex numbers and view it as a crossed product with a group G of order k by embedding G in the symmetric group S_k via the regular representation and embedding S_k in M_k(C) in the usual way. This induces a natural G-grading on M_k(C) which we call a crossed product grading. This grading is the so called elementary grading defined by any k-tuple (g_1,g_2,..., g_k) of distinct elements g_i in G. We study the graded polynomial identities for M_k(C) equipped with a crossed product grading. To each multilinear monomial in the free graded algebra we associate a directed labeled graph. This approach allows us to give new proofs of known results of Bahturin and Drensky on the generators of the T-ideal of identities and the Amitsur-Levitsky Theorem. Our most substantial new result is the determination of the asymptotic formula for the G-graded codimension of M_k(C).
description: 21 pages, 3 figures
Letter from John L. Heller to Emmett L. Bennett Jr., February 15, 1960
Creators: name: Heller, John L.
Publisher: name: The University of Texas at Austin
Year: 1960
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--John L. Heller
Nestor

description: Heller thanks Bennett for making corrections to his document for Nestor and reports an error that he noticed.
Compactly generating all satisfying truth assignments of a Horn formula
Creators: name: Wild, Marcel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Logic (math.LO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: As instance of an overarching principle of exclusion an algorithm is presented that compactly (thus not one by one) generates all models of a Horn formula. The principle of exclusion can be adapted to generate only the models of weight $k$. We compare and contrast it with constraint programming, $0,1$ integer programming, and binary decision diagrams.
description: Considerably improves upon the readibility of the previous version
On the visualisation, verification and recalibration of ternary probabilistic forecasts
Creators: name: Jupp, Tim E.
name: Lowe, Rachel
name: Coelho, Caio A. S.
name: Stephenson, David B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Applications (stat.AP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We develop a geometrical interpretation of ternary probabilistic forecasts in which forecasts and observations are regarded as points inside a triangle. Within the triangle, we define a continuous colour palette in which hue and colour saturation are defined with reference to the observed climatology. In contrast to current methods, forecast maps created with this colour scheme convey all of the information present in each ternary forecast. The geometrical interpretation is then extended to verification under quadratic scoring rules (of which the Brier Score and the Ranked Probability Score are well--known examples). Each scoring rule defines an associated triangle in which the square roots of the score, the reliability, the uncertainty and the resolution all have natural interpretations as root--mean--square distances. This leads to our proposal for a Ternary Reliability Diagram in which data relating to verification and calibration can be summarised. We illustrate these ideas with data relating to seasonal forecasting of precipitation in South America, including an example of nonlinear forecast calibration. Codes implementing these ideas have been produced using the statistical software package R and are available from the authors.
An approach to assessing human factors related occupational safety using behavioural observation-based indicators: The case of a construction site in Nigeria
Creators: name: Inyeneobong Ekoi Edem
name: Boluwatife Akinsola
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Construction industry
Safety violation
Unsafe acts
Behavioural observation
Safety performance indicators

description: Engineering and Applied Science Research, 49, 2, 133-145
Extended technology acceptance model for Indonesian mobile wallet: Structural equation modeling approach
Creators: name: Sukwadi, Ronald
name: Laurensia Sant Caroline
name: Chen, Gary Yu-Hsin
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Mobile wallet
TAM
SEM
Financial technology

description: Engineering and Applied Science Research, 49, 2, 146-154
The influence of D-branes' backreaction upon gravitational interactions between open strings
Creators: name: Benichou, Raphael
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We argue that gravitational interactions between open strings ending on D3-branes are largely shaped by the D3-branes' backreaction. To this end we consider classical open strings coupled to general relativity in Poincare AdS5 backgrounds. We compute the linear gravitational backreaction of a static string extending up to the Poincare horizon, and deduce the potential energy between two such strings. If spacetime is non-compact, we find that the gravitational potential energy between parallel open strings is independent of the strings' inertial masses and goes like 1/r at large distance r. If the space transverse to the D3-branes is suitably compactified, a collective mode of the graviton propagates usual four-dimensional gravity. In that case the backreaction of the D3-branes induces a correction to the Newtonian potential energy that violates the equivalence principle. The observed enhancement of the gravitational attraction is specific to string theory; there is no similar effect for point-particles.
description: 28 pages, 7 figures. Typos corrected, minor additions
Letter from John L. Heller to Emmett L. Bennett Jr., February 18, 1960
Creators: name: Heller, John L.
Publisher: name: The University of Texas at Austin
Year: 1960
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--John L. Heller

description: Heller apologies for any difficulties he might have caused from his suggested changes, and thanks Bennett for writing.
Physical-layer security for visible-light communication systems
Creators: name: Mostafa, Ayman
Publisher: name: University of British Columbia
Year: 2017

description: Visible-light communication (VLC) is an enabling technology that exploits the lighting infrastructure to provide ubiquitous indoor broadband coverage via high-speed short-range wireless communication links. On the other hand, physical-layer security has the potential to supplement conventional encryption methods with an additional secrecy measure that is provably unbreakable regardless of the computational power of the eavesdropper. The lack of wave-guiding transmission media in VLC channels makes the communication link inherently susceptible to eavesdropping by unauthorized users existing in areas illuminated by the data transmitters. In this thesis, we study transmission techniques that enhance the secrecy of VLC links within the framework of physical-layer security. Due to linearity limitations of typical light-emitting diodes (LEDs), the VLC channel is more accurately modelled with amplitude constraints on the channel input, rather than the conventional average power constraint. Such amplitude constraints render the prevalent Gaussian input distribution infeasible for VLC channels, making it difficult to obtain closed-form secrecy capacity expressions. Thus, we begin with deriving lower bounds on the secrecy capacity of the Gaussian wiretap channel subject to amplitude constraints. We then consider the design of optimal beamformers for secrecy rate maximization in the multiple-input single-output (MISO) wiretap channel under amplitude constraints. We show that the design problem is nonconvex and difficult to solve, however it can be recast as a solvable quasiconvex line search problem. We also consider the design of robust beamformers for worst-case secrecy rate maximization when channel uncertainty is taken into account. Finally, we study the design of linear precoders for the two-user MISO broadcast channel with confidential messages. We consider not only amplitude constraints, but also total and per-antenna average power constraints. We formulate the design problem as a nonconvex weighted secrecy sum rate maximization problem, and provide an efficient search algorithm to obtain a solution for such a nonconvex problem. We extend our approach to handle uncertainty in channel information. The design techniques developed throughout the thesis provide valuable tools for tackling real-world problems in which channel uncertainty is almost always inevitable and amplitude constraints are often necessary to accurately model hardware limitations.
Mobility analysis of FeTe thin films
Creators: name: Tsukada, I.
name: Hanawa, M.
name: Komiya, Seiki
name: Ichinose, A.
name: Akiike, T.
name: Imai, Y.
name: Maeda, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The Hall effect is investigated in detail for nonsuperconducting and superconducting FeTe thin films. The Hall coefficient commonly exhibits a sign reversal from positive in a high-temperature paramagnetic state to negative in a low-temperature antiferromagnetic state. Phenomenological analysis by a simple two-band Drude model indicates that hole mobility is significantly suppressed in the antiferromagnetic state. When suppression of the hole mobility is insufficient, superconductivity shows up in FeTe. This result strongly suggests that the itinerancy in both hole and electron channels is the essential factor for the occurrence of superconductivity in iron chalcogenide superconductors.
description: 8 pages, 3 figures. Accepted for publication in J. Phys. Soc. Jpn
Investigation of shear strength and metallurgy on semi-solid metal 356 aluminium alloy with lap joint by friction stir spot welding
Creators: name: Chaiyoot Meengam
name: Suppachai Chainarong
name: Sitthipong, Siva
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Friction stir spot welding
SSM 356 aluminium alloy
Shear strength
Joint efficiency
Globular structures

description: Engineering and Applied Science Research, 49, 2, 155-167
Is dark matter an illusion created by the gravitational polarization of the quantum vacuum?
Creators: name: Hajdukovic, Dragan Slavkov
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Physics (physics.gen-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Assuming that a particle and its antiparticle have the gravitational charge of the opposite sign, the physical vacuum may be considered as a fluid of virtual gravitational dipoles. Following this hypothesis, we present the first indications that dark matter may not exist and that the phenomena for which it was invoked might be explained by the gravitational polarization of the quantum vacuum by the known baryonic matter.
description: We have added an Appendix in order to show that the gravitational polarization of the quantum vacuum allows the understanding of the universality of the central surface density of galaxy dark matter haloes, the cored dark matter haloes in dwarf spheroidal galaxies, the non-existence of dark disks in spiral galaxies and distribution of dark matter after collision of clusters of galaxies
Explaining climate-sensitive decision-making : on the relationship between cognitive logic and climate-adaptive behaviour
Creators: name: Findlater, Kieran Mark
Publisher: name: University of British Columbia
Year: 2017

description: The harmonization of climate-adaptive behaviour with pre-existing decision-making processes is central to the way climate change adaptation is described in the literature. Yet such behaviour is largely understudied, making it difficult to predict whether and how individuals can integrate (i.e., ‘mainstream’) climate change with risk management processes for weather and other ‘normal’ stressors. In this dissertation, I examine the decision-making processes of South Africa’s commercial grain farmers, as a uniquely informative case, through five complementary studies of two original datasets. I seek to better understand the relationship between risk perceptions and climate-adaptive behaviour in this group, who are known to be sensitive to weather risks and who are adopting climate-resilient farming practices (i.e., Conservation Agriculture (CA)), but who are nonetheless perceived by local experts to be insensitive to climate change risks. In doing so, I distinguish between weather-sensitive decision-making, in which farmers perceive and react to weather risks in conjunction with other ‘normal’ risks, and climate-sensitive decision-making, in which they also perceive and react to the anticipated effects of climate change. Using mental models interviews in the Western Cape province (N = 90), I first reconceptualise farmers’ risk-based decision-making processes, drawing on theories of risk perception and framing from cognitive psychology and behavioural economics to interpret the empirical evidence. Second, I explain the variation in farmers’ adoption of climate-resilient CA practices based on the different cognitive frames (expressed as linguistic frames) that they use to perceive, interpret and respond to weather risks. Third, I use these results to guide the quantitative analysis of a national survey (N = 441), with which I assess the utility of the CA concept in promoting, monitoring and evaluating sustainable and climate-resilient farming practices, as envisioned by the Climate-Smart Agriculture and Sustainable Intensification frameworks. Fourth, I use the interview data to evaluate whether and how farmers integrate climate change and weather risks in farm-level decision-making. Fifth, I build on these findings by using the survey data to quantitatively test whether farmers perceive weather and climate change as equivalent risks.
Fast boundary extraction of color image using negative divergence of a normal compressive vector field
Creators: name: Samruan Wiangsamut
name: Nawapak Eua-Anant
name: Wutthichai Phornphatcharaphong
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Boundary extraction
Negative divergence
Normal compressive vector field

description: Engineering and Applied Science Research, 49, 2, 168-180
Effect of an in vitro environment on compressive strength and apatite formation of white Portland cement
Creators: name: Weerapol Taptimdee
name: Auttachai Jantasang
name: Prinya Chindaprasirt
name: Otsuka, Yuichi
name: Mutoh, Yoshiharu
name: Teerawat Laonapakul
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: In vitro test
Simulated body fluid
Apatite formation
Physical and mechanical property

description: Engineering and Applied Science Research, 49, 2, 181-188
More on the circumbinary disk of SS 433
Creators: name: Bowler, M. G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Certain lines in spectra of the Galactic microquasar SS 433, in particular the brilliant H alpha line, have been interpreted as emission from a circumbinary disk. In this interpretation the orbital speed of the glowing material is in excess of 200 km/s and the mass of the binary system in excess of 40 solar masses. A very simple model of excitation of disk material is in remarkable agreement with the observations, yet it seems that the very existence of a circumbinary disk is regarded as controversial. Published spectra, taken almost nightly over two orbital periods of the binary system, show H alpha and He I lines; these were analysed as superpositions of Gaussian components. A model in which the excitation of any given patch of putative circumbinary material is proportional to the inverse square of its instantaneous distance from the compact object was constructed and compared with observations. The new model provides an excellent description of the observations. The variation of the H alpha and He I spectra with orbital phase are described quantitatively provided the radius of the emitting ring is not much greater than the radius of the closest stable circumbinary orbit. The new analysis has greatly strengthened the case for a circumbinary disk orbiting the SS 433 system with a speed of over 200 km/s and presents supposed alternative explanations with major difficulties. If the circumbinary disk scenario is essentially correct, the mass of the binary system must exceed 40 solar masses and the compact object must be a rather massive black hole. The case is so strong that this possibility should be taken seriously.
description: 7 pages, 7 figures. The second version has two additional figures and an extended discussion. To appear in A & A
New constraints for heavy axion-like particles from supernovae
Creators: name: Giannotti, Maurizio
name: Duffy, Leanne D.
name: Nita, Rafaela
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We derive new constraints on the coupling of heavy pseudoscalar (axion-like) particles to photons, based on the gamma ray flux expected from the decay of these particles into photons. After being produced in the supernova core, these heavy axion-like particles would escape and a fraction of them would decay into photons before reaching the Earth. We have calculated the expected flux on Earth of these photons from the supernovae SN 1987A and Cassiopeia A and compared our results to data from the Fermi Large Area Telescope. This analysis provides strong constraints on the parameter space for axion-like particles. For a particle mass of 100 MeV, we find that the Peccei-Quinn constant, f_a, must be greater than about 10^{15} GeV. Alternatively, for fa=10^{12} GeV, we exclude the mass region between approximately 100 eV and 1 GeV.
description: 14 pages, 4 figures. Version published in JCAP. Major changes in the exposition. Added a figure. Added appendix. Minor changes in the results. Some changes in the bibliography
A novel Tiki-Taka algorithm to optimize hybrid flow shop scheduling with energy consumption
Creators: name: Mohd Fadzil Faisae Ab Rashid
name: Mu'tasim, Muhammad Ammar Nik
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Hybrid flow shop
Tiki-Taka algorithm
Energy efficiency

description: Engineering and Applied Science Research, 49, 2, 189-200
Letter from John L. Heller to Emmett L. Bennett Jr., June 23, 1960
Creators: name: Heller, John L.
Publisher: name: The University of Texas at Austin
Year: 1960
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--John L. Heller
Nestor

description: Heller notes that some of his pages for Nestor are missing in his set and asks if he could speak for them.
Global well-posedness for a slightly supercritical surface quasi-geostrophic equation
Creators: name: Dabkowski, Michael
name: Kiselev, Alexander
name: Vicol, Vlad
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q35, 76U06

description: We use a nonlocal maximum principle to prove the global existence of smooth solutions for a slightly supercritical surface quasi-geostrophic equation. By this we mean that the velocity field $u$ is obtained from the active scalar $θ$ by a Fourier multiplier with symbol $i k^\perp |k|^{-1} m(k|)$, where $m$ is a smooth increasing function that grows slower than $\log \log |k|$ as $|k|\rightarrow \infty$.
description: 11 pages, second version with slightly stronger result
Effect of active layer thickness on the performance of amorphous hydrogenated silicon solar cells
Creators: name: Soni Prayogi
name: Yoyok Cahyono
name: Dadan Hamdani
name: Darminto
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Solar cells
a-Si: H
p-i1-i2-n
p-i2-i1-n
PECVD

description: Engineering and Applied Science Research, 49, 2, 201-208
Evaluation of GNSS positioning accuracy from satellite-based augmentation systems in Thailand
Creators: name: Phunsap Thari
name: Somchai Kriengkraiwasin
name: Chalermchon Satirapod
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: GNSS
SBAS
SPAN
GAGAN
BDSBAS

description: Engineering and Applied Science Research, 49, 2, 209-217
Multi-objective optimization of a threading machine for tobacco leaves
Creators: name: Ranaporn Senasutham
name: Sujin Bureerat
name: Juckamas Laohavanich
name: Cherdpong Chiawchanwattana
name: Suphan Yangyuen
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Threading machine
Turkish tobacco leaves
Weighted sum
Response surface methodology

description: Engineering and Applied Science Research, 49, 2, 218-227
title: On the classification of cortical inhibitory neurons
Creators: name: Yáñez Lang, Felipe
Publisher: name: Universität Tübingen
Year: 2025
Subjects: subject: 004
subject: 570
subject: Machine Learning
subject: Neuroscience
subject: Inhibition

description: The brain's remarkable ability to process ambiguous information and transform it into meaningful behavior is a complex process largely performed by neurons. In computational neuroscience, this integration is investigated utilizing large-scale simulations constrained by realistic networks of excitatory and inhibitory neurons. In the cerebral cortex, inhibitory neurons exhibit high variability in cellular properties such as morphology, electrophysiology, and gene expression profiles. This diversity poses a challenge in terms of their characterization and classification across data modalities. While the major subtype specification of inhibitory neurons is given by their molecular identity, it is unknown whether morphological and electrophysiological properties systematically relate to molecular identity to organize the structure and function underlying cortical networks. In this dissertation, I present a computational methodology to assess variations in morphological, electrophysiological, and molecular properties across the entire depth of rat barrel cortex. First, I standardize a comprehensive dataset of morphological and electrophysiological properties, and demonstrate that it is representative for the depth distribution of inhibitory neurons in a cortical column. Then, the molecular composition of the entire rat barrel cortex is acquired, and quantified at 50-micron resolution. For each neuron, I calculate a variety of morphological and electrophysiological features. Multimodal clustering is then utilized to assign neurons into subtypes. Cross-validation with several classifiers is applied to identified subtypes, demonstrating their robustness. The proposed methodology outperforms existing approaches, and its interpretable nature allows me to reliably link different cellular properties across cortical depth. I found that the relative distributions of morphological and electrophysiological properties are similar at any given depth location. At the same time, these distributions systematically shift as a function of cortical depth. Regardless of subtype, the overall axonal and dendritic arborizations, as well as the firing frequency, increase with depth. In contrast, the firing frequency adaptation remains unaffected by depth. Surprisingly, these variations define depth-specific relationships that reveal the molecular identity of inhibitory neurons, which are conserved across species and cortex areas. Thus, simple organizing principles may largely account for the diversity of inhibitory neurons through the adjustment of their morphological and electrophysiological properties to their local environment within cortical circuits, providing novel insight for realistic network modeling.
Application of near-infrared spectroscopy in detection of steroids adulteration in traditional Thai medicines
Creators: name: Panmanas Sirisomboon
name: Kittisak Phetpan
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Traditional Thai medicine
Herbal medicine
Adulteration
Steroids
Near-infrared spectroscopy

description: Engineering and Applied Science Research, 49, 2, 228-234
Letter from Fred W. Householder to Emmett L. Bennett Jr., January 21, 1958
Creators: name: Householder, Fred W.
Publisher: name: The University of Texas at Austin
Year: 1958
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--Fred W. Householder
Drafts

description: Householder provides a summary Bennett sent with responses to his questions and suggests that he not publish the work yet.
Charged gravastars admitting conformal motion
Creators: name: Usmani, A A
name: Rahaman, Farook
name: Ray, Saibal
name: Nandi, K K
name: Kuhfittig, Peter K. F.
name: Rakib, Sk. A
name: Hasan, Z
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We propose a new model of a {\it gravastar} admitting conformal motion. While retaining the framework of the Mazur-Mottola model, the gravastar is assumed to be internally charged, with an exterior defined by a Reissner-Nordstr{ö}m rather than a Schwarzschild line element. The solutions obtained involve (i) the interior region, (ii) the shell, and (iii) the exterior region of the sphere. Of these three cases the first case is of primary interest since the total gravitational mass vanishes for vanishing charge and turns the total gravitational mass into an {\it electromagnetic mass} under certain conditions. This suggests that the interior de Sitter vacuum of a charged gravastar is essentially an electromagnetic mass model that must generate the gravitational mass. We have also analyzed various other aspects such as the stress energy tensor in the thin shell and the entropy of the system.
description: Minor addition, Accepted in Phys. Lett. B
Hybrid fibre reinforced eco-friendly geopolymer concrete made with waste wood ash: A mechanical characterization study
Creators: name: Kadarkarai Arunkumar
name: Muthukannan, Muthiah
name: Arunachalam Suresh Kumar
name: Arunasankar Chithambar Ganesh
name: Rangaswamy Kanniga Devi
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Eco-friendly geopolymer concrete
Waste wood ash
Polypropylene fibre
Waste tire rubber fibre
Hybrid fibre

description: Engineering and Applied Science Research, 49, 2, 235-247
Phase transition on the Si(001) clean surface prepared in UHV MBE chamber: A study by high resolution STM and in situ RHEED
Creators: name: Arapkina, L. V.
name: Yuryev, V. A.
name: Chizh, K. V.
name: Shevlyuga, V. M.
name: Storojevyh, M. S.
name: Krylova, L. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Pre-growth preparation of the Si(001) clean surface is a key process for Ge/Si UHV MBE. It usually includes pre-cleaning by liquid etchants, thermal pretreatment in UHV and removal of SiO2 or a different protective coat prior to MBE. Chemical pre-cleaning usually results in formation of the thin SiO2 film or the surface passivated by H. Depending on chemical pretreatment different purification processes are applied to prepare the clean surface in UHV. A structure of the Si(001) surface which may affect MBE was studied by STM and RHEED. Experiments were carried out in UHV using the Riber SSC2 instrument coupled with GPI-300 STM. Si wafers were either etched beforehand in the solutions of RCA or HF and HNO3 mixture or passivated in the HF solutions. The (2x1) reconstruction was found to mainly arise in UHV after deoxidization processes such as high-temperature annealing or SiO2 removal by a weak flux of Si. The c(8x8) structure was also often observed by STM at room temperature and found to occupy whole surface or a part of it depending on sample cooling rate and chemical pretreatment. The c(8x8) structure observed by STM was evidenced to correspond to (4x4) one in the RHEED patterns; the later replaced (2x1) when the samples were cooled below 600C and turned out to be reversible with the transition point of ~600C. A structural model of the c(8x8) surface and a pathway of its formation in assumption of surface stress field self ordering are proposed.
description: A lecture at E-MRS 2010 Fall Meeting; Nanoscale Research Letters, 2011; http://www.nanoscalereslett.com/content/6/1/218
Cardiac function and physical activity participation in individuals with spinal cord injury
Creators: name: McCracken, Laura A.
Publisher: name: University of British Columbia
Year: 2017

description: Individuals with spinal cord injury (SCI) are at greatly increased risk of cardiovascular disease (CVD). This is likely due to physical inactivity and impaired sympathetic control of the heart and blood vessels, resulting in cardiovascular dysfunction. Cardiovascular dysfunction in individuals with SCI is associated with injury level, whereby individuals with higher lesions exhibit greater dysfunction. In people without SCI, cardiac dysfunction predicts CVD. The studies that have investigated cardiac indices in individuals with SCI tend to agree that cardiac atrophy and impaired systolic function occur following SCI. Physical activity is a key method to decrease CVD risk and improve cardiac function, yet few studies have examined the relationship between cardiac function and physical activity in individuals with SCI. Those that have investigated this relationship have used subjective measures of physical activity. The current guidelines for physical activity participation for individuals with SCI were based on a systematic review of the evidence on the benefits of physical activity, yet there was inadequate evidence to prescribe activity intensity and duration to improve cardiovascular health in this population. Individuals with SCI also experience numerous barriers and facilitators to physical activity participation that affect their ability to meet the guideline recommendations. The objectives of this thesis, therefore, were: 1) to objectively measure physical activity in individuals with SCI, using wrist-worn accelerometry during a six-day physical activity monitoring period, and to evaluate the utility of group based wrist accelerometry cut-points to estimate physical activity intensity by comparing MVPA determined by individual cut-points to MVPA determined by group-based cut-points; 2) to determine the relationship between objectively measured physical activity and cardiac structure and function in individuals with SCI across a range of injury levels, and 3) to explore the barriers and facilitators to physical activity participation experienced by individuals with SCI during a six-day physical activity monitoring period.
Letter from Fred W. Householder to Emmett L. Bennett Jr., February 3, 1958
Creators: name: Householder, Fred W.
Publisher: name: The University of Texas at Austin
Year: 1958
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--Fred W. Householder
Linear B

description: Householder ponders the meaning of the word "te-qi-ro-jo-ne," which he says he overlooked and asks Bennett for news on his future.
Gas output of HomeBiogas7.0 in province1 (Terai region) of Nepal and HomeBiogas7.0 model vs GGC-2047
Creators: name: Bashu Gautam
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Anaerobic digestion
Fixed dome
GGC-2047
HomeBiogas7.0
Manure
Nepal

description: Engineering and Applied Science Research, 49, 2, 248-258
Letter from Fred W. Householder to Emmett L. Bennett Jr., November 17, 1965
Creators: name: Householder, Fred W.
Publisher: name: The University of Texas at Austin
Year: 1965
Subjects: subject: Emmett L. Bennett, Jr. Collection
subject: Emmett L. Bennett, Jr. Collection--Correspondence
subject: Emmett L. Bennett, Jr. Collection--Correspondence--Fred W. Householder
subject: Linguistics
subject: FOS: Languages and literature
subject: Linear B

description: Householder discusses an article called "Inconsistencies in Cherokee Spelling" and its relevance to Linear B.
Smart city's trends, architectures, components, and challenges: A systematic review and building an initial model for Indonesia
Creators: name: Arief, Assaf
name: Sensuse, Dana Indra
name: Mursanto, Petrus
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Smart cities
Systematic review
Research trends
Component
Architectures
Initial models

description: Engineering and Applied Science Research, 49, 2, 259-271
Pressure effects on the transport coefficients of Ba(Fe1-xCox)2As2
Creators: name: Arsenijević, S.
name: Gaál, R.
name: Sefat, A. S.
name: McGuire, M. A.
name: Sales, B. C.
name: Mandrus, D.
name: Forró, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report the temperature dependence of the resistivity and thermoelectric power under hydrostatic pressure of the itinerant antiferromagnet BaFe2As2 and the electron-doped superconductor Ba(Fe0.9Co0.1)2As2. We observe a hole-like contribution to the thermopower below the structural-magnetic transition in the parent compound that is suppressed in magnitude and temperature with pressure. Pressure increases the contribution of electrons to transport in both the doped and undoped compound. In the 10% Co-doped sample, we used a two-band model for thermopower to estimate the carrier concentrations and determine the effect of pressure on the band structure.
A comprehensive review on the performance analysis of composite overwrapped pressure vessels
Creators: name: B, Rahul
name: Dharmahinder Singh Chand
name: Dharani J
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: Composite overwrapped pressure vessels
Finite element model
Failure analysis
Performance evaluation

description: Engineering and Applied Science Research, 49, 2, 272-287
An elementary survey on structural, electrical, and optical properties of perovskite materials
Creators: name: Bijayalaxmi Kuanar
name: Mohanty, Hari S.
name: Dhrubananda Behera
name: Priyambada Nayak
name: Dalai, Biswajit
Publisher: name: Faculty of Engineering, Khon Kaen University
Year: 2022
Subjects: PZT
Lead-free
BNT
Dielectric
Ferroelectric properties

description: Engineering and Applied Science Research, 49, 2, 288-299