cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Defect-driven tunable electronic and optical properties of two-dimensional silicon carbide
Creators: name: Singh, Arushi
name: Mahamiya, Vikram
name: Shukla, Alok
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Recently, an atomic-scale two-dimensional silicon carbide monolayer has been synthesized {[}Polley \emph{et al., }Phys. Rev. Lett. \textbf{130},076203 (2023){]} which opens up new possibilities for developing next-generation electronic and optoelectronic devices. Our study predicts the pristine SiC monolayer to have an ``indirect'' band gap of 3.38 eV $(K\rightarrow M)$ and a ``direct'' band gap of 3.43 eV $(K\rightarrow K)$ calculated using the HSE06 functional. We performed a detailed investigation of the various possible defects (i.e., vacancies, foreign impurities, antisites, and their various combinations) on the structural stability, electronic, and optical properties of the SiC monolayer using a first-principles based density-functional theory (DFT) and molecular dynamics (MD) simulations. A number of physical quantities such as the formation energy, electronic band gap, and the effective masses of charge carriers, have been calculated. We report that the SiC monolayer has a very low formation energy of 0.57 eV and can be stabilized on TaC \{111\} film by performing the surface slab energy and interfacial adhesion energy calculations. Nitrogen doping is predicted to be the most favorable defect in silicon carbide monolayer due to its very low formation energy, indicating high thermodynamic stability. An interesting transition from semiconducting to metallic state is observed for $N_{C}$ and $Al_{Si}$ defective systems. For the pristine SiC monolayer, we find that the conduction band is nearly flat in the $M\rightarrow K$ direction, leading to a high effective mass of $3.48m_{o}$. A significant red shift in the absorption edge, as well as the occurrence of additional absorption peaks due to the defects, have been observed in the lower energy range of the spectrum.
description: 34 pages, 13 figures (manuscript 31 pages, 10 figures + supplemental material 3 pages, 3 figures)
Simulation of an All-Silicon Tracker
Creators: name: Meyer, Chris
name: Rice, Tyler
name: Stevens, Lori
name: Schumm, Bruce A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present recent improvements in the performance of the reconstruction of non-prompt track in the SiD Detector Concept Design, including initial results on the effect of longitudinal segmentation in the SiD tracker. We also describe a generic tracking validation package developed at SCIPP.
description: 5 pages, 1 figure, to appear in the proceedings of the 2007 International Linear Collider Workshop, DESY, Hamburg, Germany, May 30 - June 3, 2007
Let's Wait Awhile: How Temporal Workload Shifting Can Reduce Carbon Emissions in the Cloud
Creators: name: Wiesner, Philipp
name: Behnke, Ilja
name: Scheinert, Dominik
name: Gontarska, Kordian
name: Thamsen, Lauritz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Depending on energy sources and demand, the carbon intensity of the public power grid fluctuates over time. Exploiting this variability is an important factor in reducing the emissions caused by data centers. However, regional differences in the availability of low-carbon energy sources make it hard to provide general best practices for when to consume electricity. Moreover, existing research in this domain focuses mostly on carbon-aware workload migration across geo-distributed data centers, or addresses demand response purely from the perspective of power grid stability and costs. In this paper, we examine the potential impact of shifting computational workloads towards times where the energy supply is expected to be less carbon-intensive. To this end, we identify characteristics of delay-tolerant workloads and analyze the potential for temporal workload shifting in Germany, Great Britain, France, and California over the year 2020. Furthermore, we experimentally evaluate two workload shifting scenarios in a simulation to investigate the influence of time constraints, scheduling strategies, and the accuracy of carbon intensity forecasts. To accelerate research in the domain of carbon-aware computing and to support the evaluation of novel scheduling algorithms, our simulation framework and datasets are publicly available.
description: To be published in the proceedings of the 22nd International Middleware Conference (Middleware '21), December 6-10, 2021, Virtual Event, Canada
Determining the temperature-dependent London penetration depth in HTS thin films and its effect on SQUID performance
Creators: name: Keenan, Shane
name: Pegrum, Colin
name: Labarias, Marc Gali
name: Mitchell, Emma E
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The optimum design of high-sensitivity Superconducting Quantum Interference Devices (SQUIDs) and other devices based on thin HTS films requires accurate inductance modeling. This needs the London penetration depth $λ$ to be well defined, not only at 77 K, but also for any operating temperature, given the increasingly widespread use of miniature low-noise single-stage cryocoolers. Temperature significantly affects all inductances in any active superconducting device and cooling below 77 K can greatly improve device performance, however accurate data for the temperature dependence of inductance and $λ(T)$ for HTS devices is largely missing in the literature. We report here inductance measurements on a set of 20 different thin-film YBCO SQUIDs at 77 K with thickness $t = 220$ or 113 nm. By combining experimental data and inductance modeling we find an average penetration depth $λ(77) = 391$ nm at 77 K, which was independent of $t$. Using the same methods we derive an empirical expression for $λ(T)$ for a further three SQUIDs measured on a cryocooler from 50 to 79 K. Our measured value of $λ(77)$ and our inductance extraction procedures were then used to estimate the inductances and the effective areas of directly coupled SQUID magnetometers with large washer-style pick-up loops. The latter agree to better than 7% with experimentally-measured values, validating our measured value of $λ(77)$ and our inductance extraction methods.
description: The following article has been accepted by Applied Physics Letters. After it is published, it will be found at https://doi.org/10.1063/5.0065790
Do Gedankenexperiments compel quantization of gravity?
Creators: name: Rydving, Erik
name: Aurell, Erik
name: Pikovski, Igor
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Whether gravity is quantized remains an open question. To shed light on this problem, various Gedankenexperiments have been proposed. One popular example is an interference experiment with a massive system that interacts gravitationally with another distant system, where an apparent paradox arises: even for space-like separation the outcome of the interference experiment depends on actions on the distant system, leading to a violation of either complementarity or no-signalling. A recent resolution shows that the paradox is avoided when quantizing gravitational radiation and including quantum fluctuations of the gravitational field. Here we show that the paradox in question can also be resolved without considering gravitational radiation, relying only on the Planck length as a limit on spatial resolution. Therefore, in contrast to conclusions previously drawn, we find that the necessity for a quantum field theory of gravity does not follow from so far considered Gedankenexperiments of this type. In addition, we point out that in the common realization of the setup the effects are governed by the mass octopole rather than the quadrupole. Our results highlight that no Gedankenexperiment to date compels a quantum field theory of gravity, in contrast to the electromagnetic case.
description: 5 pages, 1 figure
การประเมินอายุที่เกิดจากความล้าของท่อความร้อนชนิดสั่นวงรอบ                         ที่ติดตั้งวาล์วกันกลับที่สภาวะอุณหภูมิการทำงาน
Creators: name: สถิตพงศ์  เสงี่ยมศักดิ์
name: Watanabe, Osamu
name: บพิธ  บุปผโชติ
name: และสัมพันธ์  ฤทธิเดช
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2014
Subjects: ความล้า, ท่อความร้อนชนิดสั่นวงรอบที่ติดตั้งวาล์วกันกลับ, รูปทรงนาฬิกาทราย

description: 2, 8, วารสารวิชาการและวิจัย มทร.พระนคร
องค์ประกอบสิ่งแวดล้อมการเรียนรู้ในการศึกษาสร้างสรรค์บนเครือข่ายสังคม เพื่อพัฒนาความคิดสร้างสรรค์
Creators: name: ฉันทนา  ปาปัดถา
name: ณมน  จีรังสุวรรณ
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2014
Subjects: สิ่งแวดล้อมการเรียนรู้, การศึกษาสร้างสรรค์, เครือข่ายสังคม, ความคิดสร้างสรรค์

description: 2, 8, วารสารวิชาการและวิจัย มทร.พระนคร
The Magnetic Mechanism for Hotspot Reversals in Hot Jupiter Atmospheres
Creators: name: Hindle, A. W.
name: Bushby, P. J.
name: Rogers, T. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Magnetically-driven hotspot variations (which are tied to atmospheric wind variations) in hot Jupiters are studied using non-linear numerical simulations of a shallow-water magnetohydrodynamic (SWMHD) system and a linear analysis of equatorial SWMHD waves. In hydrodynamic models, mid-to-high latitude geostrophic circulations are known to cause a net west-to-east equatorial thermal energy transfer, which drives hotspot offsets eastward. We find that a strong toroidal magnetic field can obstruct these energy transporting circulations. This results in winds aligning with the magnetic field and generates westward Lorentz force accelerations in hotspot regions, ultimately causing westward hotspot offsets. In the subsequent linear analysis we find that this reversal mechanism has an equatorial wave analogy in terms of the planetary scale equatorial magneto-Rossby waves. We compare our findings to three-dimensional MHD simulations, both quantitively and qualitatively, identifying the link between the mechanics of magnetically-driven hotspot and wind reversals. We use the developed theory to identify physically-motivated reversal criteria, which can be used to place constraints on the magnetic fields of ultra-hot Jupiters with observed westward hotspots.
description: 30 pages, 9 figures, 3 tables
ประสิทธิภาพของสารฆ่าเชื้อกรดเพอร์ออกซีแอซีติกและสารละลายโซเดียมไฮโพคลอไรต์ในการลดปริมาณจุลินทรีย์ที่ผิวของผักและผลไม้สดแกะสลัก
Creators: name: จอมขวัญ สุวรรณรักษ
name: พุดกรอง พันธุ์อุโมงค์
name: นิธิยา รัตนาปนนท์
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2014
Subjects: ผักและผลไม้แกะสลัก, กรดเพอร์ออกซีแอซีติก, โซเดียมไฮโพคลอไรต์, จุลินทรีย์

description: 2, 8, วารสารวิชาการและวิจัย มทร.พระนคร
การพัฒนาระบบลางานออนไลน์
Creators: name: นนิดา  สร้อยดอกสน
name: ณัฐพร  สวัสดิ์นาวิน
name: ปิยนุช  ขันติศุข
Publisher: name: มหาวิทยาลัยกรุงเทพ
Year: 2014
Subjects: ระบบลางานออนไลน์, การพัฒนาระบบลางานออนไลน์

description: 2, 8, วารสารวิชาการและวิจัย มทร.พระนคร
Resonance Production in RHIC Collisions
Creators: name: Markert, Christina
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Results of resonance particle production measured at RHIC in $\sqrt{s_{\rm NN}} = $ 200 GeV Au+Au collisions are compared to measurements in p+p and d+Au collisions in order to verify the existence of an extended hardronically interacting medium. Yield and momentum distributions of resonances maybe modified during the fireball lifetime due to resonance decay and the subsequent rescattering of their decay daughters as well as the regeneration of resonances from their decay products. Modified momentum spectra in heavy ion collisions may change the nuclear modification factor R$_{\rm AA}$. The influence on the elliptic flow v$_{2}$ due to late regeneration of resonances is discussed.
description: 6 pages, 6 figures, Proceedings of the 22st Winter Workshop on Nuclear Dynamics, San Diago, California, 12-18 March, 2006
Prestige deprivation and responses : Chinese professionals in Vancouver
Creators: name: Lim, Bea Fung
Publisher: name: University of British Columbia
Year: 2010

description: This thesis is a qualitative study of Chinese professionals in Vancouver. Thirteen respondents were subjected to unstructured in-depth interviews guided by a questionaire schedule which seek to explore the respondents' experience of their ethnicity in their work environment and outside of it. The data gathered was interpreted in terms of status inconsistency theory. Status inconsistency theory looks at the locations of individuals in a set of status hierarchies, the relationship between these locations and its consequences. Objectively, Chinese ethnic status is inconsistent with professional status since the former is negatively evaluated in relation to most White ethnic groups while professional status is positively evaluated in relation to most other occupational statuses. The main body of the thesis deals with status inconsistency as it is translated into the subjective experiences of Chinese professionals. Ethnic status is inconsistent with professional status when it deprives Chinese professionals of the prestige available to professionals of positively evaluated ethnic groups; when Chinese professionals are treated according to their lower ethnic status rather than their higher professional status» and when Chinese professionals experience special difficulties in their work environment as a result of their ethnic status — such as difficulties in getting promotions and difficulties in communicating with superiors and colleagues. This thesis found that Chinese professionals respond to status inconsistency in various ways. The participation of Chinese professionals in ethnic organisations is particularly striking. This active involvement with one's own ethnic group appear to contradict another tendency of the respondents: the tendency to negatively evaluate their own ethnic group. In terms of status inconsistency theory, involvement in ethnic organisations dissolves the connection between professional status and ethnic status since within the ethnic group, ethnic status rankings does not apply. Occupational status is the more relevant criterion of rank within one's own ethnic group. Thus,Chinese professionals within their own ethnic group are regarded only in terms of their high professional status and thus enjoy high prestige. Negative evaluation of one's own ethnic group is, on the other hand, a confirmation of ethnic group rankings with an attempt to dissociate oneself from one's own negatively evaluated ethnic group by adopting the role of an outsider. This thesis is exploratory in nature. It aimed to find common problems and common responses. Its findings may be useful in generating hypotheses for future research.
Piety and fraternalism : a study of the relationship between secret fraternal societies and the American civil religion
Creators: name: Loughrey, Elizabeth Jean
Publisher: name: University of British Columbia
Year: 2010

description: Robert Bellah has suggested that there "exists alongside of and rather clearly differentiated from the churches and elaborate and well institutionalized civil religion in America". This religion expresses certain common elements of religious orientation shared by most Americans. It gives, says Bellah, a "religious dimension to all aspects of life including the political sphere". Accepting Bellah's argument, this thesis analyses working mens' secret fraternal societies as one aspect of the institutionalization of the American Civil Religion. It examines how fraternal organizations have fostered public religion as a vital force within American culture. More specifically, it examines the following interrelated questions. What is the nature of American Civil Religion? How is a particular understanding of this religion reflected in the fraternal emphasis of American lodges? Why has its collective expression required the maintenance of a cloak of secrecy? How do the rituals of secret fraternal societies mediate and confirm for their members the ideals of the public religion? Historically, what segment of the population has been most attracted to this interpretation of American Civil Religion? What is the nature of the dynamic relationship between American society, its civil religion and organized secret fraternalism?
Higgs doublet as a Goldstone boson in perturbative extensions of the Standard Model
Creators: name: Bellazzini, Brando
name: Pokorski, Stefan
name: Rychkov, Vyacheslav S.
name: Varagnolo, Alvise
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the idea of the Higgs doublet as a pseudo-Goldstone boson in perturbative extensions of the Standard Model, motivated by the desire to ameliorate its hierarchy problem without conflict with the electroweak precision data. Two realistic supersymmetric models with global SU(3) symmetry are proposed, one for large and another for small values of tanβ. The two models demonstrate two different mechanisms for EWSB and the Higgs mass generation. Their experimental signatures are quite different. Our constructions show that a pseudo-Goldstone Higgs doublet in perturbative extensions is just as plausible as in non-perturbative ones.
description: 16pp, typos corrected, phenomenological discussion expanded
Drying kinetic of Tilapia nilotica drying using hot air
Creators: name: Umphisak Teeboonma
name: Prateep Toomthong
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2010
Subjects: Drying, Drying kinetic,Hot air, Thin layer equation

description: 4, 37, KKU Engineering Journal
Gravitational Self-Lensing in Populations of Massive Black Hole Binaries
Creators: name: Kelley, Luke Zoltan
name: D'Orazio, Daniel J.
name: Di Stefano, Rosanne
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The community may be on the verge of detecting low-frequency gravitational waves from massive black hole binaries (MBHBs), but no examples of binary active galactic nuclei (AGN) have been confirmed. Because MBHBs are intrinsically rare, the most promising detection methods utilize photometric data from all-sky surveys. Recently D'Orazio & Di Stefano 2018 (arXiv:1707.02335) suggested gravitational self-lensing as a method of detecting AGN in close separation binaries. In this study we calculate the detectability of lensing signatures in realistic populations of simulated MBHBs. Within our model assumptions, we find that VRO's LSST should be able to detect 10s to 100s of self-lensing binaries, with the rate uncertainty depending primarily on the orientation of AGN disks relative to their binary orbits. Roughly a quarter of lensing detectable systems should also show detectable Doppler boosting signatures. If AGN disks tend to be aligned with the orbit, lensing signatures are very nearly achromatic, while in misaligned configurations the bluer optical bands are lensed more than redder ones. Whether substantial obscuring material (e.g.~a dusty torus) will be present in close binaries remains uncertain, but our estimates suggest that a substantial fraction of systems would still be observable in this case.
description: 10+3 pages, 4+2 figures, comments welcome and appreciated
An application of the value stream mapping and computer simulation for reducing an average service time for patients in the emergency care unit : a case study of the out-patient emergency care unit, Srinagarind Hospital
Creators: name: Laongdao Khunngio
name: Panitarn Peerapattana
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2013
Subjects: Out-patient emergency care unit,Lean tools,Value stream mapping,Computer simulation

description: 4, 40, KKU Engineering Journal
NO ONE FIT FOR ALL: Different profiles of school functioning among the 8th grade students
Creators: name: Erentaite, Rasa
name: Sevalneva, Daiva
name: Eglė Melnikė
name: Gudynas, Pranas
Publisher: name: Zenodo
Year: 2021
Subjects: Student profiles, student assessment, school achievement

description: Oral presentation at ISPA 2021 (International School Psychology Association) conference. Abstract: A holistic way to understand school functioning of students means looking across different age-relevant domains rather than focusing on a single academic domain or variable (Roeser & Galloway, 2002). The holistic approach helps to reveal distinct student subgroups and understand their specific vulnerabilities. Following this approach our goal was to identify different profiles of adolescent school functioning across three domains: academic achievement, relations with peers, and learning motivation. The data were drawn from the National Survey of Student Achievement of Lithuanian 8th grade students. Overall, 998 students (50% females) took standardised achievement tests and filled-in bullying victimisation and learning motivation scales. Results of cluster analysis revealed four distinct profiles of school functioning: Underachievement (31%), Peer Victimisation (7%), Low Motivation (33%), and Multiple Assets (29%). These four profiles had differential links to a set of predictors: the Underachievement and Multiple Assets profiles were best distinguished by student socio-economic background, while Peer Victimisation and Low Motivation profiles were best described by a perceived lack of teacher support at school. Analyses of the distribution of these profiles on a school level could help schools in setting their priorities and addressing specific student vulnerabilities.
Investigating Academic Resilience: What Could Help to Mitigate SES-related Achievement Inequalities
Creators: name: Eglė Melnikė
name: Raižienė, Saulė
name: Sevalneva, Daiva
name: Erentaitė, Rasa
Publisher: name: Zenodo
Year: 2021

description: Oral presentation at the European Conference on Educational Research (ECER), 6-10 September, 2021, online (Geneva). Published abstract: https://eera-ecer.de/ecer-programmes/conference/26/contribution/51494/
Adaptive maximum power point tracking using neural networks for a photovoltaic systems according grid
Creators: name: Sahraoui, H.
name: Mellah, H.
name: Drid, S.
name: Chrifi-Alaoui, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Introduction. This article deals with the optimization of the energy conversion of a grid-connected photovoltaic system. The novelty is to develop an intelligent maximum power point tracking technique using artificial neural network algorithms. Purpose. Intelligent maximum power point tracking technique is developed in order to improve the photovoltaic system performances under the variations of the temperature and irradiation. Methods. This work is to calculate and follow the maximum power point for a photovoltaic system operating according to the artificial intelligence mechanism is and the latter is used an adaptive modified perturbation and observation maximum power point tracking algorithm based on function sign to generate an specify duty cycle applied to DC-DC converter, where we use the feed forward artificial neural network type trained by Levenberg-Marquardt backpropagation. Results. The photovoltaic system that we chose to simulate and apply this intelligent technique on it is a stand-alone photovoltaic system. According to the results obtained from simulation of the photovoltaic system using adaptive modified perturbation and observation artificial neural network the efficiency and the quality of the production of energy from photovoltaic is increased. Practical value. The proposed algorithm is validated by a dSPACE DS1104 for different operating conditions. All practice results confirm the effectiveness of our proposed algorithm.
Diurnal and nocturnal behavioural responses of shallow-water benthic marine scavengers to fish carrion. (Supp. Material)
Creators: name: DAVENPORT, JOHN
name: JESSOPP, MARK
name: HARMAN, LUKE
name: Micaroni, Valerio
name: McALLEN, ROB
Publisher: name: figshare
Year: 2021
Subjects: subject: 60201 Behavioural Ecology
subject: FOS: Biological sciences

description: Videoclips (5) of behaviour of benthic scavengers (on fish carrion) in Lough Hyne, Ireland
Optical Cluster-Finding with An Adaptive Matched-Filter Technique: Algorithm and Comparison with Simulations
Creators: name: Dong, Feng
name: Pierpaoli, Elena
name: Gunn, James E.
name: Wechsler, Risa H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a modified adaptive matched filter algorithm designed to identify clusters of galaxies in wide-field imaging surveys such as the Sloan Digital Sky Survey. The cluster-finding technique is fully adaptive to imaging surveys with spectroscopic coverage, multicolor photometric redshifts, no redshift information at all, and any combination of these within one survey. It works with high efficiency in multi-band imaging surveys where photometric redshifts can be estimated with well-understood error distributions. Tests of the algorithm on realistic mock SDSS catalogs suggest that the detected sample is ~85% complete and over 90% pure for clusters with masses above 1.0*10^{14} h^{-1} M_solar and redshifts up to z=0.45. The errors of estimated cluster redshifts from maximum likelihood method are shown to be small (typically less that 0.01) over the whole redshift range with photometric redshift errors typical of those found in the Sloan survey. Inside the spherical radius corresponding to a galaxy overdensity of Delta=200, we find the derived cluster richness Lambda_{200} a roughly linear indicator of its virial mass M_{200}, which well recovers the relation between total luminosity and cluster mass of the input simulation.
description: Accepted to ApJ. 13 pages, 9 figures
Transitional solar dynamics, cosmic rays and global warming
Creators: name: Bershadskii, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Solar activity is studied using a cluster analysis of the time-fluctuations of the sunspot number. It is shown that in an Historic period the high activity components of the solar cycles exhibit strong clustering, whereas in a Modern period (last seven solar cycles: 1933-2007) they exhibit a white-noise (non-)clustering behavior. Using this observation it is shown that in the Historic period, emergence of the sunspots in the solar photosphere was strongly dominated by turbulent photospheric convection. In the Modern period, this domination was broken by a new more active dynamics of the inner layers of the convection zone. Then, it is shown that the dramatic change of the sun dynamics at the transitional period (between the Historic and Modern periods, solar cycle 1933-1944yy) had a clear detectable impact on Earth climate. A scenario of a chain of transitions in the solar convective zone is suggested in order to explain the observations, and a forecast for the global warming is suggested on the basis of this scenario. A relation between the recent transitions and solar long-period chaotic dynamics has been found. Contribution of the galactic turbulence (due to galactic cosmic rays) has been discussed. These results are also considered in a content of chaotic climate dynamics at millennial timescales.
description: Extended version
On Semiclassical Limits of String States
Creators: name: Blanco-Pillado, Jose J.
name: Iglesias, Alberto
name: Siegel, Warren
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore the relation between classical and quantum states in both open and closed (super)strings discussing the relevance of coherent states as a semiclassical approximation. For the closed string sector a gauge-fixing of the residual world-sheet rigid translation symmetry of the light-cone gauge is needed for the construction to be possible. The circular target-space loop example is worked out explicitly.
description: 12 pages
Lower-Luminosity Obscured AGN Host Galaxies are Not Predominantly in Major-Merging Systems at Cosmic Noon
Creators: name: Lambrides, Erini
name: Chiaberge, Marco
name: Heckman, Timothy
name: Kirkpatrick, Allison
name: Meyer, Eileen T.
name: Petric, Andreea
name: Hall, Kirsten
name: Long, Arianna
name: Watts, Duncan J.
name: Gilli, Roberto
name: Simons, Raymond
name: Tchernyshyov, Kirill
name: Rodriguez-Gomez, Vicente
name: Vito, Fabio
name: De La Vega, Alexander
name: Davis, Jeffrey R.
name: Kocevski, Dale D
name: Norman, Colin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: For over 60 years, the scientific community has studied actively growing central super-massive black holes (active galactic nuclei -- AGN) but fundamental questions on their genesis remain unanswered. Numerical simulations and theoretical arguments show that black hole growth occurs during short-lived periods ($\sim$ 10$^{7}$ -10$^{8}$ yr) of powerful accretion. Major mergers are commonly invoked as the most likely dissipative process to trigger the rapid fueling of AGN. If the AGN-merger paradigm is true, we expect galaxy mergers to coincide with black hole accretion during a heavily obscured AGN phase (N$_H$ $ > 10^{23}$ cm$^{-2}$). Starting from one of the largest samples of obscured AGN at 0.5 $
description: 19 pages, 11 figures, accepted in ApJ
Acoustic absorption and generation in ducts of smoothly varying area sustaining a mean flow and a mean temperature gradient
Creators: name: Yeddula, Saikumar Reddy
name: Gaudron, Renaud
name: Morgans, Aimee S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In ducts with varying cross-sectional area and sustaining a subsonic non-isentropic mean flow, the axially varying flow conditions affect the acoustic energy balance of the system. This is significant in understanding and controlling thermo-acoustic phenomena, particularly in combustors. This work aims at quantifying the acoustic energy change in such configurations, using the acoustic absorption coefficient, $Δ$. The acoustic response of the duct to acoustic forcing is determined using an analytical model, neglecting the effect of entropy fluctuations on the acoustic field, and subsequently, $Δ$ is estimated. The model predictions of $Δ$ are validated using a linearised Euler equations (LEEs) solver. The model was found to be accurate for Mach numbers below $0.25$, provided the lower frequency limit set by the analytical solution is satisfied. For conically varying area ducts with linear mean temperature gradient, it was observed that $Δ$ showed very little dependence on frequency, and that the absolute value of $Δ$ tended to be maximised when the upstream boundary was anechoic rather than non-anechoic. More importantly, $Δ$ was also observed to show stronger dependence on the mean temperature gradient than area gradient variation for such configurations. Further parametric and optimisation studies for $Δ$ revealed a crucial finding that a positive mean temperature gradient, representing a heated duct caused acoustic energy absorption. Similarly, a negative mean temperature gradient, representing a cooled duct caused acoustic energy generation -- a key result of this analysis. This behaviour was shown to be consistent with a simplified analysis of the acoustic energy balance. Based on this finding, a linearly proportional reduction in acoustic energy generation was achieved by changing the mean temperature gradient.
Multi-variate time-series for time constraint adherence prediction in complex job shops
Creators: name: May, Marvin Carl
name: Behnen, Lukas
name: Holzer, Andrea
name: Kuhnle, Andreas
name: Lanza, Gisela
Publisher: name: Elsevier
Year: 2021
Subjects: Production Planning
Control
Time Constraints
Data Analytics
Time Series Analysis
Machine Learning

description: One of the most complex and agile production environments is semiconductor manufacturing, especially wafer fabrication, as products require more than several hundred operations and remain in Work-In-Progress for months leading to complex job shops. Additionally, an increasingly competitive market environment, i.e. owing to Moore’s law, forces semiconductor companies to focus on operational excellence, resiliency and, hence, leads to product quality as a decisive factor. Product-specific time constraints comprising two or more, not necessarily consecutive, operations ensure product quality at an operational level and, thus, are an industry-specific challenge. Time constraint adherence is of utmost importance, since violations typically lead to scrapping entire lots and a deteriorating yield. Dispatching decisions that determine time constraint adherence are as a state of the art performed manually, which is stressful and error-prone. Therefore, this article presents a data-driven approach combining multi-variate time-series with centralized information to predict time constraint adherence probability in wafer fabrication to facilitate dispatching. Real-world data is analyzed and different statistical and machine learning models are evaluated.
Search for the Flavor Changing Neutral Current Decay t $\to Zq$ in $p \bar{p}$ Collisions at $\sqrt{s}=1.96$
Creators: name: CDF Collaboration
name: Aaltonen, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report a search for the flavor changing neutral current (FCNC) decay of the top quark \tZq ($q=u,c$) in \ppbar collisions at $\sqrt{s} = 1.96\tev$ using a data sample corresponding to an integrated luminosity of 1.9\invfb collected by the CDF II detector. This decay is strongly suppressed in the standard model (SM) and an observation of a signal at the Tevatron would be an indication of physics beyond the SM. Using $Z+\ge4$ jet final state candidate events, both with and without an identified bottom quark jet, we discriminate signal from background by exploiting kinematic constraints present in FCNC events and obtain an upper limit of $\btZq < 3.7%$ at 95% C.L.
Feminism and collectivity : the integrative function
Creators: name: Light, Linda Louise
Publisher: name: University of British Columbia
Year: 2010

description: Collectivity, (a non-bureaucratic, non-hierarchical participatory-democratic organizational form) has been developed as an alternative to bureaucracy in some Western industrial societies. Such an organizational form, although existing independently of the feminist movement, is one important tool used by that movement to accomplish its goals. Collectivity has a particularly close relationship with what I have called integrative feminism, which focuses on a synthesis of feminine and masculine polarities both in society and within individuals, on a re-definition and sharing of power, and on an emphasis on the feminine sphere in order to redress the present imbalance between the masculine and the feminine in Western society. Collectivity, with its emphasis on democratization and feminization of the work process, shares many of the goals of integrative feminism. The purpose of the thesis, then, is to demonstrate the masculine nature of traditional bureaucracy and the feminine nature of collectivity, and thus the relationship between integrative feminism and collectivity. The point of view taken in this thesis is that the sexual polarization that exists throughout Western industrial society is not a natural outcome of the biological differences between the sexes, but is socially determined and therefore changeable by social means. The thesis argues that this polarization, manifested in one-sided personality development for both sexes and the division of social life into an over-valued masculine (productive) sphere and an under-valued feminine (maintenance) sphere, which emphasize different functions, characteristics and values, is destructive to human and social growth. It also argues that sexual polarization is a significant factor in the crisis the world is now facing, which involves the domination of the powerless by the powerful, domestic and international conflict, and, in the West, too-rapid growth and over-consumption. While certain limitations restrict the general application of collectivity as a universal organizational form (for example, social demands for productivity and disparity between the ideology of collectivity and the dominant ideology), it may be that elements of collectivity can be effectively combined with elements of bureaucracy in a variety of contexts. The data on which the argument is based includes the literature of feminism, organizations, and social movements; previous research done on the Vancouver Women's Health Collective; and personal experience in social movement activity.
Hot Jupiters in binary star systems
Creators: name: Wu, Yanqin
name: Murray, Norman W.
name: Ramsahai, J. Michael
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Radial velocity surveys find Jupiter mass planets with semi-major axes a less than 0.1 AU around ~1% of solar-type stars; counting planets with $a$ as large as 5 AU, the fraction of stars having planets reaches ~ 10% {Marcy,Butler}. An examination of the distribution of semi-major axes shows that there is a clear excess of planets with orbital periods around 3 or 4 days, corresponding to a~0.03$ AU, with a sharp cutoff at shorter periods (see Figure 1). It is believed that Jupiter mass planets form at large distances from their parent stars; some fraction then migrate in to produce the short period objects. We argue that a significant fraction of the `hot Jupiters' (a<0.1 AU) may arise in binary star systems in which the orbit of the binary is highly inclined to the orbit of the planet. Mutual torques between the two orbits drive down the minimum separation or periapse r_p between the planet and its host star (the Kozai mechanism). This periapse collapse is halted when tidal friction on the planet circularizes the orbit faster than Kozai torque can excite it. The same friction then circularizes the planet orbit, producing hot Jupiters with the peak of the semimajor axis distribution lying around 3 days. For the observed distributions of binary separation, eccentricity and mass ratio, roughly 2.5% of planets with initial semimajor axis a_p ~ 5au will migrate to within 0.1au of their parent star. Kozai migration could account for 10% or more of the observed hot Jupiters.
description: accepted to ApJ main journal, added one figure and expanded discussions
Optical solitons in saturable cubic-quintic nonlinear media with nonlinear dispersion
Creators: name: Das, Sudipta
name: Dey, Kajal Krishna
name: Sekh, Golam Ali
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We study an intense-short pulse propagation in a saturable cubic-quintic nonlinear media in the presence of nonlinear dispersion within the framework of an extended variational approach. We derive an effective equation for the pulse width and demonstrate how the saturation due to nonlinearity is achieved in presence of nonlinear dispersion. We find that the nonlinear dispersion can change the pulse width and induce motion in the system. The direction of induced motion depends on the sign of nonlinear dispersion. The pulse is energetically stable at an equilibrium width. A disturbance can, however, induce oscillation in pulse width, the frequency of which is always smaller due to nonlinear dispersion. We check dynamical stability by a direct numerical simulation.
description: 7 pages, 5 figures
Luminosity-Colours relations for thin disc main-sequence stars
Creators: name: Bilir, S.
name: Karaali, S.
name: Ak, S.
name: Yaz, E.
name: Cabrera-Lavers, A.
name: Coskunoglu, K. B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this study we present the absolute magnitude calibrations of thin disc main-sequence stars in the optical ($M_{V}$), and in the near-infrared ($M_{J}$). Thin disc stars are identified by means of Padova isochrones, and absolute magnitudes for the sample are evaluated via the newly reduced Hipparcos data. The obtained calibrations cover a large range of spectral types: from A0 to M4 in the optical and from A0 to M0 in the near-infrared. Also, we discuss the of effects binary stars and evolved stars on the absolute magnitude calibrations. The usage of these calibrations can be extended to the estimation of galactic model parameters for the thin disc individually, in order to compare these parameters with the corresponding ones estimated by $χ{^2}_{min}$ statistics (which provides galactic model parameters for thin and thick discs, and halo simultaneously) to test any degeneracy between them. The calibrations can also be used in other astrophysical researches where distance plays an important role in that study.
description: 8 pages, including 12 figures and 4 tables, accepted for publication in MNRAS
The coupling between pulsation and mass loss in massive stars
Creators: name: Townsend, Rich
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: To what extent can pulsational instabilities resolve the mass-loss problem of massive stars? How important is pulsation in structuring and modulating the winds of these stars? What role does pulsation play in redistributing angular momentum in massive stars? Although I cannot offer answers to these questions, I hope at the very least to explain how they come to be asked.
description: 12 pages, 1 figure, to appear in proceedings of "Unsolved Problems in Stellar Physics" conference (Cambridge, UK, July 2007)
Polynomial Ridge Flowfield Estimation
Creators: name: Scillitoe, Ashley
name: Seshadri, Pranay
name: Wong, Chun Yui
name: Duncan, Andrew B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Computational fluid dynamics plays a key role in the design process across many industries. Recently, there has been increasing interest in data-driven methods, in order to exploit the large volume of data generated by such computations. This paper introduces the idea of using spatially correlated polynomial ridge functions for rapid flowfield estimation. Dimension reducing ridge functions are obtained for numerous points within training flowfields. The functions can then be used to predict flow variables for new, previously unseen, flowfields. Their dimension reducing nature alleviates the problems associated with visualising high dimensional datasets, enabling improved understanding of design spaces and potentially providing valuable physical insights. The proposed framework is computationally efficient; consisting of either readily parallelisable tasks, or linear algebra operations. To further reduce the computational cost, ridge functions need only be computed at only a small number of subsampled locations. The flow physics encoded within covariance matrices obtained from the training flowfields can then be used to predict flow quantities, conditional upon those predicted by the ridge functions at the sampled points. To demonstrate the efficacy of the framework, the incompressible flow around an ensemble of aerofoils is used as a test case. On unseen aerofoils the ridge functions' predictive accuracy is found to be reasonably competitive with a state-of-the-art convolutional neural network (CNN). The local ridge functions can also be reused to obtain surrogate models for integral quantities such a loss coefficient, which is advantageous in situations where long-term storage of the CFD data is problematic. Finally, use of the ridge framework with varying boundary conditions is demonstrated on a three dimensional transonic wing flow.
description: 24 pages, 18 figures
Optical emission line spectra of symbiotic binaries
Creators: name: Kuuttila, Jere
name: Gilfanov, Marat
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Symbiotic stars are long-period interacting binaries where the compact objects, most commonly a white dwarf, is embedded in the dense stellar wind of an evolved companion star. UV and soft X-ray emission of the accretion disk and nuclear burning white dwarf plays a major role in shaping the ionisation balance of the surrounding wind material and giving rise to the rich line emission. In this paper, we employ 2D photoionisation calculations based on Cloudy code to study the ionisation state of the circumbinary material in symbiotic systems and to predict their emission line spectra. Our simulations are parameterized via the orbital parameters of the binary and the wind mass-loss rate of the donor star, while the mass accretion rate, temperature and luminosity of the WD are computed self-consistently. We explore the parameter space of symbiotic binaries and compute luminosities of various astrophysicaly important emission lines. The line ratios are compared to the traditional diagnostic diagrams used to distinguish symbiotic binaries from other types of sources and it is shown how the binary system parameters shape these diagrams. In the significant part of the parameter space the wind material is nearly fully ionized, except for the "shadow" behind the donor star, thus the WD emission is typically freely escaping the system
description: 17 pages and 23 figures (including appendix). Accepted for publication in MNRAS
Framework for simulation-based Trajectory Planning and Execution of Robots equipped with a Laser Scanner for Measurement and Inspection
Creators: name: Kaiser, Jan-Philipp
name: Becker, Sven Norbert
name: Wurster, Marco
name: Stricker, Nicole
name: Lanza, Gisela
Publisher: name: Elsevier
Year: 2021
Subjects: Trajectory planning
Robotic
ROS
CoppeliaSim
Laser scanning
Virtual validation
Simulation

description: Shorter product life cycles require ever faster planning processes for the manufacturing of products. This also applies for measuring processes to ensure compliance with geometric workpiece specifications. In addition, these processes must be designed to be increasingly flexible since mass customization steadily increases product variety. Laser scanning systems mounted on robots offer the possibility of measuring a wide variety of geometries with low measurement uncertainty. In this paper, a method is presented with which measurement trajectories can be planned and virtually validated. We thereby combine and extend existing trajectory planning approaches and explicitly integrate robot kinematics into the planning approach to account for feasibility of the planned trajectories. These can then be directly transferred to the available measurement system. This is enabled by a real time interface directly connecting a virtual environment for measurement simulation and the real measurement system.