cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Depth profile high-energy spectroscopic study of Mn-doped GaN prepared by thermal diffusion
Creators: name: Hwang, J. I.
name: Osafune, Y.
name: Kobayashi, M.
name: Ebata, K.
name: Ooki, Y.
name: Ishida, Y.
name: Fujimori, A.
name: Takeda, Y.
name: Okane, T.
name: Saitoh, Y.
name: Kobayashi, K.
name: Tanaka, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have performed an $in$-$situ$ depth profile study of Mn-doped GaN prepared by a low temperature thermal diffusion method using photoemission and x-ray absorption spectroscopy. It was revealed from the core-level photoemission measurements that Mn ions are diffused into a deep ($\sim$ 70 Å) region of the GaN substrates and that the line shapes of Mn 3$d$ partial density of states obtained by resonant photoemission measurements was close to that of Ga$_{1-x}$Mn$_x$N thin films grown by molecular-beam epitaxy. From x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) measurements at the Mn $L$-edge, it was revealed that the doped Mn ions were in the divalent Mn$^{2+}$ state and primarily paramagnetic. In magnetization measurements, weak hysteresis was detected in samples prepared using $p$-type GaN substrates while samples using $n$-type GaN substrates showed only paramagnetism.
description: 19pages, 13figures
Electron power absorption dynamics in a low pressure radio frequency driven capacitively coupled discharge in oxygen
Creators: name: Proto, A.
name: Gudmundsson, J. T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We use the one-dimensional object-oriented particle-in-cell Monte Carlo collision code oopd1 to explore the properties and the origins of both the electric field and electron power absorption within the plasma bulk for a capacitively coupled oxygen discharge operated at 10 and 100 mTorr for 45 mm of gap distance. The properties of the electric field at three different time slices as well as time averaged have been explored considering the moments of the Boltzmann equation. The electron power absorption is distinctly different at these operating pressures. The most relevant contributions to the electric field at different time steps come from the pressure terms, the ambipolar and the electron temperature gradient terms, along with the ohmic term. The same applies for the electron power absorption. At both 10 and 100 mTorr the relative ohmic contribution to the electron power absorption remains roughly the same, while the ambipolar term contributes to power absorption and the temperature gradient term to electron cooling at 100 mTorr, and the opposite applies at 10 mTorr. At 100 mTorr the discharge is weekly electronegative, and electron power absorption is mainly due to sheath expansion while at 10 mTorr it is strongly electronegative, and the electron power absorption occurs mainly within the electronegative core and drift-ambipolar mode dominates. The agreement between the calculated values and the simulations is good for both the electric field and the electron power absorption within the plasma bulk and in the collapsed sheath region for all the cases considered.
description: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, 128(11) (2020) 113302 and may be found at https://doi.org/10.1063/5.0019340
Statistical Physics on the space (x,v) for dissipative systems and study of an ensemble of harmonic oscillators in a weak linear dissipative medium
Creators: name: Lopez, G.
name: Lopez, P.
name: Lopez, X. E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We use the phase space position-velocity ($x,v$) to deal with the statistical properties of velocity dependent dynamical systems, like dissipative ones. Within this approach, we study the statistical properties of an ensemble of harmonic oscillators in a linear weak dissipative media. Using the Debye model of a crystal, we calculate at first order in the dissipative parameter the entropy, free energy, internal energy, equation of state and specific heat using the classical and quantum approaches. for the classical approach we found that the entropy, the equation of state, and the free energy depend on the dissipative parameter, but the internal energy and specific heat do not depend of it. For the quantum case, we found that all the thermodynamical quantities depend on this parameter.
description: 11 pages, 2 figures
Injected Power Fluctuations in 1D Dissipative Systems
Creators: name: Farago, Jean
name: Pitard, Estelle
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using fermionic techniques, we compute exactly the large deviation function (ldf) of the time-integrated injected power in several one-dimensional dissipative systems of classical spins. The dynamics are T=0 Glauber dynamics supplemented by an injection mechanism, which is taken as a Poissonian flipping of one particular spin. We discuss the physical content of the results, specifically the influence of the rate of the Poisson process on the properties of the ldf.
description: 18 pages, 8 figures
ModelDiff: Testing-Based DNN Similarity Comparison for Model Reuse Detection
Creators: name: Li, Yuanchun
name: Zhang, Ziqi
name: Liu, Bingyan
name: Yang, Ziyue
name: Liu, Yunxin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: The knowledge of a deep learning model may be transferred to a student model, leading to intellectual property infringement or vulnerability propagation. Detecting such knowledge reuse is nontrivial because the suspect models may not be white-box accessible and/or may serve different tasks. In this paper, we propose ModelDiff, a testing-based approach to deep learning model similarity comparison. Instead of directly comparing the weights, activations, or outputs of two models, we compare their behavioral patterns on the same set of test inputs. Specifically, the behavioral pattern of a model is represented as a decision distance vector (DDV), in which each element is the distance between the model's reactions to a pair of inputs. The knowledge similarity between two models is measured with the cosine similarity between their DDVs. To evaluate ModelDiff, we created a benchmark that contains 144 pairs of models that cover most popular model reuse methods, including transfer learning, model compression, and model stealing. Our method achieved 91.7% correctness on the benchmark, which demonstrates the effectiveness of using ModelDiff for model reuse detection. A study on mobile deep learning apps has shown the feasibility of ModelDiff on real-world models.
description: ISSTA 2021
Generation of a single ion large oscillator
Creators: name: Saito, Ryoichi
name: Mukaiyama, Takashi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We demonstrate the generation of a trapped ion oscillator having large oscillation amplitude of $16.9~{\rm μm}$. Applying an offset voltage to the ion trap electrode helped achieve a displacement of the trap center within the time scale of 5 ns. The fluorescence dynamics of the ion were analyzed after the displacement to estimate the oscillation amplitude. The realized trap displacement is one order magnitude larger than that achieved in the previous work. Thus, this result is an important step toward the realization of a gyroscope using a single trapped ion.
description: 6 pages, 3 figures
IQTISODIY O'SISH- TARAQQIYOTNING YANGI BOSQICHLARI VA ULARNING TA'SIRI
Creators: name: Qalandarova, Zebo
name: Saxatova, Muqaddas
Publisher: name: Zenodo
Year: 2025

description: Iqtisodiy o‘sish tushunchasining mohiyati, uning turlari, iqtisodiy o‘sish sur’atiga ta’sir qiluvchi omillar tahlili, iqtisodiy o‘sishga berilgan ta’riflar, iqtisodiy islohotlarni amalga oshirishning mohiyati va zarurati tahlil qilinadi. Yuqoridagilarni hisobga olgan holda, mamlakat o‘sishining mavjud holati tahlil qilindi. Shunday qilib, ushbu maqolaning asosiy e’tibori iqtisodiy o‘sish omillarining qanchalik muhim ekanligi, ya’ni mamlakat yalpi ichki mahsulotida tutgan o‘rni.
Using Machine Learning to Select High-Quality Measurements
Creators: name: Edmonds, Andrew
name: Brown, David
name: Vinas, Luciano
name: Pagan, Samantha
Publisher: name: arXiv
Year: 2021
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Machine Learning (cs.LG)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We describe the use of machine learning algorithms to select high-quality measurements for the Mu2e experiment. This technique is important for experiments with backgrounds that arise due to measurement errors. The algorithms use multiple pieces of ancillary information that are sensitive to measurement quality to separate high-quality and low-quality measurements.
description: 8 pages, 3 figures
Transport in open spin chains: A Monte Carlo wave-function approach
Creators: name: Michel, Mathias
name: Hess, Ortwin
name: Wichterich, Hannu
name: Gemmer, Jochen
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate energy transport in several two-level atom or spin-1/2 models by a direct coupling to heat baths of different temperatures. The analysis is carried out on the basis of a recently derived quantum master equation which describes the nonequilibrium properties of internally weakly coupled systems appropriately. For the computation of the stationary state of the dynamical equations, we employ a Monte Carlo wave-function approach. The analysis directly indicates normal diffusive or ballistic transport in finite models and hints toward an extrapolation of the transport behavior of infinite models.
description: to be published in Physical Reviews B
Gas-phase CO2 emission toward Cepheus A East: the result of shock activity?
Creators: name: Sonnentrucker, P.
name: González-Alfonso, E.
name: Neufeld, D. A.
name: Bergin, E. A.
name: Melnick, G. J.
name: Forrest, W. J.
name: Pipher, J. L.
name: Watson, D. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the first detection of gas-phase CO2 emission in the star-forming region Cepheus A East, obtained by spectral line mapping of the v2 bending mode at 14.98 micron with the Infrared Spectrograph (IRS) instrument onboard the Spitzer Space Telescope. The gaseous CO2 emission covers a region about 35'' x 25'' in extent, and results from radiative pumping by 15 micron continuum photons emanating predominantly from the HW2 protostellar region. The gaseous CO2 exhibits a temperature distribution ranging from 50 K to 200 K. A correlation between the gas-phase CO2 distribution and that of H2 S(2), a tracer of shock activity, indicates that the CO2 molecules originate in a cool post-shock gas component associated with the outflow powered by HW2. The presence of CO2 ice absorption features at 15.20 micron toward this region and the lack of correlation between the IR continuum emission and the CO2 gas emission distribution further suggest that the gaseous CO2 molecules are mainly sputtered off grain mantles -- by the passage of slow non-dissociative shocks with velocities of 15-30 km/s -- rather than sublimated through grain heating.
description: 11 pages, 6 figures, accepted for publication in ApJL
Rough translation of file 031_A (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-090915-08: rough translation (30 second to 3-4 minute chunks) of file 031_A (tape 31, side A) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from start to 7:00; no transcription in this session, translation only. Session aborted once it became clear that this tape is a duplicate of 020_A. Due to re-numbering, tape 031_A has been assigned to the CLA item number LA256.031, audio file LA256.031A.
The Native Youth Project
Creators: name: Perkins, Elena Ann
Publisher: name: University of British Columbia
Year: 2011

description: Throughout the history of the discipline, anthropologists have assumed the role of cultural brokers, often taking explicit responsibility as advocates and representatives for dependent populations. Over the years, the role of cultural broker has changed, reflecting the intellectual and political milieu of the times. This perspective has been evident in the organizational culture at the University of British Columbia Museum of Anthropology (MOA) which has demonstrated a strong public service orientation since the late 1940s. This is a formative evaluation case study of the Native Youth Project, an education programme for First Nations teenagers which was active throughout the 1980s. The purpose of a formative evaluation is to provide information on the operation of a programme so those responsible for it can make improvements. The Native Youth Project (NYP) was initiated in 1979, co-sponsored by MOA and the Native Indian Youth Advisory Society (NIYAS). Conceived as a social intervention programme to improve academic achievement and introduce young people of aboriginal ancestry into productive careers in the mainstream Canadian society, this programme had a strong cultural component, promoting pride in First Nations heritage. The teenagers were trained to make presentations on various aspects of the indigenous culture of the Northwest Coast to museum visitors and community groups. Tracking the development of the programme reveals changing sensibilities among MOA staff toward the role of cultural brokerage. This case study also describes an example of the intersection between aboriginal and public institutional forms of organization and programming. The contributions of the various stakeholders and the context of the project's operation are described using the ethnographic methods of participant observation and interviewing. It is also an exercise in reflexive anthropology, since the author was an active member of the management and instructional team that is the focus of analysis.
Lowering the critical temperature with eight-quark interactions
Creators: name: Osipov, A. A.
name: Hiller, B.
name: Moreira, J.
name: Blin, A. H.
name: da Providencia, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is shown that eight-quark interactions, which are needed to stabilize the ground state of the combined three flavor Nambu -- Jona-Lasinio and 't Hooft Lagrangians, play also an important role in determining the critical temperature at which transitions occur from the dynamically broken chiral phase to the symmetric phase.
description: 4 pages, 2 figures
FastCTF: A Robust Solver for Conduction Transfer Function Coefficients and Thermal Response Factors
Creators: name: Jaber, Khodr
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: Conduction transfer functions (CTF) are commonly used in the building services to quickly estimate hourly conduction heat loads through multilayered walls without resorting to expensive, time-consuming solutions of the heat equation. It is essential for any software developed for this purpose to be able to simulate walls of varying weight with a high degree of accuracy. A robust algorithm for computing CTF coefficients and thermal response factors based on power series expansions of solutions of the governing equations in the complex s-domain is presented and validated. These series expansions are used to to construct Padé approximants of the system's transfer functions, which greatly simplifies the inversion of the solution from the complex domain to the time domain, and allows for an easy recovery of a time series representation via the Z-transform. The algorithm is also implemented in an open-source C++ code. Its performance is validated with respect to exact theoretical frequency characteristics and its results are compared with data generated by previously established methods for computing CTF coefficients / response factors.
Note Illustrative della Carta geologica d'Italia alla scala 1:50.000, F. 292 Jesi
Creators: name: Guerrera, F.
name: Tramontana, M.
Publisher: name: INFN Open Access Repository
Year: 2012

description: Note illustrative redatte per il Foglio geologico n. 292 Jesi della Carta Geologica d'Italia alla scala 1:50.000. 122 pp.
Competitiveness and Protection in World Agriculture
Creators: name: Vollrath, Thomas L.
name: Vollrath, Thomas L.
Publisher: name: Unknown
Year: 1989
Subjects: Agricultural and Food Policy
International Relations/Trade
Research Methods/ Statistical Methods

description: The United States advocates competitive and efficient world markets. This report explores what agricultural competitiveness means by using three different measures: market share, relative export advantage, and revealed competitiveness. Each measure has a special use. This analysis shows that the most competitive agricultural exporters are usually those with the least government intervention. It also shows that the United States is most competitive in agricultural commodities such as soybeans and coarse grains that receive relatively little government protection. This apparent conflict between competitiveness and protection suggests that openness makes markets perform better, increasing global economic efficiency.
The influence of surface $CO_{\mathrm{2}}$ condensation on the evolution of warm and cold rocky planets orbiting Sun-like stars
Creators: name: Bonati, Irene
name: Ramirez, Ramses M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The habitable zone is the region around a star where standing bodies of liquid water can be stable on a planetary surface. Its width is often assumed to be dictated by the efficiency of the carbonate-silicate cycle, which has maintained habitable surface conditions on our planet for billions of years. This cycle may be inhibited by surface condensation of significant amounts of $CO_{\mathrm{2}}$ ice, which is likely to occur on distant planets containing high enough levels of atmospheric $CO_{\mathrm{2}}$. Such a process could permanently trap $CO_{\mathrm{2}}$ ice within the planet, threatening its long-term habitability. Recent work has modeled this scenario for initially cold and icy planetary bodies orbiting the Sun. Here, we use an advanced energy balance model to consider both initially warm and cold rapidly-rotating planets orbiting F - K stars. We show that the range of orbital distances where significant surface $CO_{\mathrm{2}}$ ice condensation occurs is significantly reduced for warm start planets. Star type does not affect this conclusion, although surface $CO_{\mathrm{2}}$ ice condenses over a larger fraction of the habitable zone around hotter stars. The warm start simulations are thus consistent with 1-D model predictions, suggesting that the classical habitable zone limits in those earlier models are still valid. We also find that the cold start simulations exhibit trends that are consistent with those of previous work for the Sun although we now extend the analysis to other star types.
description: 11 pages, 6 figures; accepted for publication in MNRAS
CATS: CfAO Treasury Survey of distant galaxies, supernovae, and AGN's
Creators: name: Koo, David C.
name: Melbourne, Jason
name: Max, Claire
name: Metevier, Anne
name: Ammons, Mark
name: Larkin, James E.
name: Barczys, Matthew
name: Wright, Shelley A.
name: Steinbring, Eric
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The NSF Science and Technology Center for Adaptive Optics (CfAO) is supporting a major scientific legacy project called the CfAO Treasury Survey (CATS). CATS is obtaining near-infrared AO data in deep HST survey fields, such as GEMS, GOODS-N, & EGS. Besides summarizing the main objectives of CATS, we highlight some recent imaging work on the study of distant field galaxies, AGNs, and a redshift z = 1.32 supernova. CATS plans the first data release to the community in early 2007 (check http://www.astro.ucla.edu/~irlab/cats/index.shtml for more details on CATS and latest updates).
description: 2 pages. Proceedings of the IAU Symposium 235, "Galaxy Evolution across the Hubble Time", F. Combes & J. Palous (eds.)
On the Iwasawa-Taniguchi effect of radio-quiet AGN
Creators: name: Bianchi, Stefano
name: Guainazzi, Matteo
name: Matt, Giorgio
name: Bonilla, Nuria Fonseca
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The existence of an anti-correlation between the Equivalent Width (EW) of the neutral narrow core of the iron Kalpha emission line and the 2-10 keV luminosity (the so-called `X-ray Baldwin' or `Iwasawa-Taniguchi' effect) has been debated in the last years. We aim at testing this claim on the largest catalogue of radio quiet AGN high-quality X-ray spectra ever published. The final sample comprises 157 objects. We search for a relation of the iron line EW not only with the X-ray luminosity, but also with the Black Hole mass, the Eddington ratio and the cosmological distance. The data presented here were analyzed homogeneously, all spectra are from the same instrument and with high Signal-to-Noise Ratio. A linear censored fit on the EW versus 2-10 keV luminosity is highly significant and yields $\log(EW_{Fe}) = (1.73\pm0.03) + (-0.17\pm0.03) \log(L_{X,44})$, where $EW_{Fe}$ is the EW of the neutral iron Kalpha line in eV and $L_{x,44}$ is the 2-10 keV X-ray luminosity in units of $10^{44}$ erg s$^{-1}$. The anti-correlation with the Eddington ratio is also very significant, while no dependence of the iron EW on the BH mass is apparent.
description: 4 pages, 4 figures, accepted for publication in Astronomy and Astrophysics Letters
Measurement of helium-3 and deuterium stopping power ratio for negative muons
Creators: name: Bystritsky, V. M.
name: Gerasimov, V. V.
name: Wozniak, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The measurement method and results measuring of the stopping power ratio of helium-3 and deuterium atoms for muons slowed down in the D/$^3$He mixture are presented. Measurements were performed at four values of pure $^3$He gas target densities, $ϕ_{He} = 0.0337, 0.0355, 0.0359, 0.0363$ (normalized to the liquid hydrogen density) and at a density 0.0585 of the D/$^3$He mixture. The experiment was carried out at PSI muon beam $μ$E4 with the momentum P$μ=34.0$ MeV/c. The measured value of the mean stopping ratio $S_{^3He/D}$ is $1.66\pm 0.04$. This value can also be interpreted as the value of mean reduced ratio of probabilities for muon capture by helium-3 and deuterium atoms.
description: 7 pages, 6 figures
Political change in an ancient Mesoamerican community : Kaminaljuyu within the Valley of Guatemala (500 B.C. - A.D. 1000)
Creators: name: Ryan, Michael W
Publisher: name: University of British Columbia
Year: 2011

description: This thesis examines the causes and processes of culture change in complex society in ancient Mesoamerica. Facets of political and social change are attributed to the effects of competition for status, power and prestige. The position is taken that, although competition is not directly observable, it is visible in its patterned effects on the material record. Thus, the study examines the uses of material culture in sociopolitical terms, and then attempts to explain socio-political interaction and change using the archaeological remnants of material culture. The archaeological record for Kaminaljuyu and vicinity within the Valley of Guatemala is used as a test case. Essentially, status competition, underwritten by material and consensual support, leads to efforts to promote economic production and population size. Responses to increases in polity scale and complexity lead to political adjustment and change. A processual model is proposed which focuses on change within and between two dominant economic and status support systems, the local subsistence system and the regional wealth trade system. Relevant social variables are linked to archaeological materials to enable operationalization of the theory. Thus political support is represented by aspects of settlement (population size and distribution) and by economic production (land use, craft production). Status demonstration is represented by construction activity and-political maintenance is represented by the provision of administrative space. The main findings for Kaminaljuyu are that: 1) Long-distance wealth trade in commodities and status goods was associated with maximization of all types of economic production, centralization of political power, rural population increase and population dispersal. 2) The local subsistence system was associated with decentralization of political power, localized economic productivity, centralization of population (crowding) and possible social conflict. The method also led to the investigation of and insights into the record for Kaminaljuyu. The analysis demonstrated a two-period cycle of socio-political change, each cycle conforming to the sequence of change proposed in the model. This pattern conforms to well-known cycles of political centralization and decentralization. This approach was useful for investigating the archaeological record for this type of complex polity.
Crystallography on Curved Surfaces
Creators: name: Vitelli, Vincenzo
name: Lucks, Julius B.
name: Nelson, David R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study static and dynamical properties that distinguish two dimensional crystals constrained to lie on a curved substrate from their flat space counterparts. A generic mechanism of dislocation unbinding in the presence of varying Gaussian curvature is presented in the context of a model surface amenable to full analytical treatment. We find that glide diffusion of isolated dislocations is suppressed by a binding potential of purely geometrical origin. Finally, the energetics and biased diffusion dynamics of point defects such as vacancies and interstitials is explained in terms of their geometric potential.
description: 12 Pages, 8 Figures
A spatial refractive index sensor using whispering gallery modes in an optically trapped microsphere
Creators: name: Zijlstra, P.
name: van der Molen, K. L.
name: Mosk, A. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose the use of an optically trapped, dye doped polystyrene microsphere for spatial probing of the refractive index at any position in a fluid. We demonstrate the use of the dye embedded in the microsphere as an internal broadband excitation source, thus eliminating the need for a tunable excitation source. We measured the full width at half maximum of the TE and TM resonances, and their frequency spacing as a function of the refractive index of the immersion fluid. From these relations we obtained an absolute sensitivity of 5e-4 in local refractive index, even when the exact size of the microsphere was not a priori known.
description: 3 pages, 3 figures
Variational principles and finite element Bloch analysis in couple stress elastodynamics
Creators: name: Guarín-Zapata, Nicolás
name: Gomez, Juan
name: Hadjesfandiari, Ali Reza
name: Dargush, Gary F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: J.2
subject: 74J05, 74S05

description: We address the numerical simulation of periodic solids (phononic crystals) within the framework of couple stress elasticity. The additional terms in the elastic potential energy lead to dispersive behavior in shear waves, even in the absence of material periodicity. To study the bulk waves in these materials, we establish an action principle in the frequency domain and present a finite element formulation for the wave propagation problem related to couple stress theory subject to an extended set of Bloch-periodic boundary conditions. A major difference from the traditional finite element formulation for phononic crystals is the appearance of higher-order derivatives. We solve this problem with the use of a Lagrange-multiplier approach. After presenting the variational principle and general finite element treatment, we particularize it to the problem of finding dispersion relations in elastic bodies with periodic material properties. The resulting implementation is used to determine the dispersion curves for homogeneous and porous couple stress solids, in which the latter is found to exhibit an interesting bandgap structure.
description: 29 pages, 8 figures
Which Way Now? Supporting Librarians' Skills in an Ever-Changing Landscape
Creators: name: Sewell, Claire
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019
Subjects: skills
librarians
libraries
scholarly communication
research support
information literacy

description: Presentation given at the CILIP Information Literacy Group Event "Exploring the Intersections of Information Literacy and Scholarly Communications". This presentation looks at the range of job roles available to librarians in scholarly communication and the skills they need to work in these roles. It also contains an activity designed to encourage the mapping of known information literacy skills on to existing scholarly communication job advertisements.
Planet-induced radio emission from the coronae of M dwarfs: the case of Prox Cen and AU Mic
Creators: name: Kavanagh, Robert D.
name: Vidotto, Aline A.
name: Klein, Baptiste
name: Jardine, Moira M.
name: Donati, Jean-François
name: Fionnagáin, Dúalta Ó
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: There have recently been detections of radio emission from low-mass stars, some of which are indicative of star-planet interactions. Motivated by these exciting new results, in this paper we present Alfvén wave-driven stellar wind models of the two active planet-hosting M dwarfs Prox Cen and AU Mic. Our models incorporate large-scale photospheric magnetic field maps reconstructed using the Zeeman-Doppler Imaging method. We obtain a mass-loss rate of $0.25~\dot{M}_{\odot}$ for the wind of Prox Cen. For the young dwarf AU Mic, we explore two cases: a low and high mass-loss rate. Depending on the properties of the Alfvén waves which heat the corona in our wind models, we obtain mass-loss rates of $27$ and $590~\dot{M}_{\odot}$ for AU Mic. We use our stellar wind models to assess the generation of electron cyclotron maser instability emission in both systems, through a mechanism analogous to the sub-Alfvénic Jupiter-Io interaction. For Prox Cen we do not find any feasible scenario where the planet can induce radio emission in the star's corona, as the planet orbits too far from the star in the super-Alfvénic regime. However, in the case that AU Mic has a stellar wind mass-loss rate of $27~\dot{M}_{\odot}$, we find that both planets b and c in the system can induce radio emission from $\sim10$ MHz to 3 GHz in the corona of the host star for the majority of their orbits, with peak flux densities of $\sim10$ mJy. Detection of such radio emission would allow us to place an upper limit on the mass-loss rate of the star.
description: 8 pages, 5 figures. Accepted for publication in MNRAS
A D-term Modeling Code (DMC) for simultaneous calibration and full-Stokes imaging of very long baseline interferometric data
Creators: name: Pesce, Dominic W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: In this paper we present DMC, a model and associated tool for polarimetric imaging of very long baseline interferometry datasets that simultaneously reconstructs the full-Stokes emission structure along with the station-based gain and leakage calibration terms. DMC formulates the imaging problem in terms of posterior exploration, which is achieved using Hamiltonian Monte Carlo sampling. The resulting posterior distribution provides a natural quantification of uncertainty in both the image structure and in the data calibration. We run DMC on both synthetic and real datasets, the results of which demonstrate its ability to accurately recover both the image structure and calibration quantities as well as to assess their corresponding uncertainties. The framework underpinning DMC is flexible, and its specific implementation is under continued development.
description: 16 pages, 10 figures, accepted for publication in ApJ
Transfers of Rural Land
Creators: name: Wunderlich, Gene
name: Wunderlich, Gene
Publisher: name: Unknown
Year: 1989
Subjects: Land Economics/Use

description: A 1988 nationwide survey of rural land transfers revealed that 4.6 percent of parcels and 3.5 percent of the acreage of rural land changed hands during 1987. Agricultural and nonagricultural parcels transferred were evenly divided, but 74 percent of the acreage was agricultural. Parcels of rural land are owned for an average of 22 years. Arms-length or market sales represented only 38 percent of rural land transferred.
Isomonodromic deformations along a stratum of the coalescence locus
Creators: name: Guzzetti, Davide
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider deformations of a differential system with Poincare' rank 1 at infinity and Fuchsian singularity at zero along a stratum of a coalescence locus. We give necessary and sufficient conditions for the deformation to be strongly isomonodromic, both as an explicit Pfaffian system (integrable deformation) and as a non linear system of PDEs on the residue matrix A at the Fuchsian singularity. This construction is complementary to that of [13]. For the specific system here considered, the results generalize those of [26], by giving up the generic conditions, and those of [3], by giving up the Lidskii generic assumption. The importance of the case here considered originates form its applications in the study of strata of Dubrovin-Frobenius manifolds and F-manifolds.
description: 59 pages, 4 figures
Transcription of file 024_B (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-090915-07: transcription of file 024_B (tape 24, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 17:52 to 18:45; poor recording quality (possible microphone power supply issue); recording cut off before end of session, so transcription of 18:45 to 19:01 was not recorded. Due to re-numbering, tape 024_B has been assigned to the CLA item number LA256.024, audio file LA256.024B.
Evidence of chromospheric molecular hydrogen emission in a solar flare observed by the IRIS satellite
Creators: name: Mulay, Sargam M.
name: Fletcher, Lyndsay
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have carried out the first comprehensive investigation of enhanced line emission from molecular hydrogen, H$_{2}$ at 1333.79 Å, observed at flare ribbons in SOL2014-04-18T13:03. The cool H$_{2}$ emission is known to be fluorescently excited by Si IV 1402.77 Å UV radiation and provides a unique view of the temperature minimum region (TMR). Strong H$_{2}$ emission was observed when the Si IV 1402.77 Å emission was bright during the flare impulsive phase and gradual decay phase, but it dimmed during the GOES peak. H$_{2}$ line broadening showed non-thermal speeds in the range 7-18 $\rm{km~s}^{-1}$, possibly corresponding to turbulent plasma flows. Small red (blue) shifts, up to 1.8 (4.9) $\rm{km~s}^{-1}$ were measured. The intensity ratio of Si IV 1393.76 Å and Si IV 1402.77 Å confirmed that plasma was optically thin to Si IV (where the ratio = 2) during the impulsive phase of the flare in locations where strong H$_{2}$ emission was observed. In contrast, the ratio differs from optically thin value of 2 in parts of ribbons, indicating a role for opacity effects. A strong spatial and temporal correlation between H$_{2}$ and Si IV emission was evident supporting the notion that fluorescent excitation is responsible.
description: Accepted for publication in Monthly Notices of the Royal Astronomical Society Main Journal
Συμβολή στη μελέτη της φυσιολογικής δράσης βιοδραστικών συστατικών από το σησάμι
Creators: name: Λαζάρου, Δέσποινα Σ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Διατροφή
Αντιμεταλλαξιγόνος δράση
Nutrition
Antimutational action

description: Στη παρούσα διατριβή μελετήθηκαν οι επιπτώσεις της διατροφής με σησάμι στην έκφραση ισομορφών του ενζύμου τρανσφεράση της γλουταθειόνης. Η μεθοδολογία που χρησιμοποιήθηκε περιελάμβανε βιοχημική μελέτη, προσδιορισμό των επιπέδων mRNA(Northern Blotting) και της πρωτεϊνικής συγκέντρωσης συγκεκριμένων ισοενζυμικών μορφών(western blotting). Επίσης, μελετήθηκε η επίδραση της συγκεκριμένης διατροφής στη δραστικότητα του ενζύμου EROD, τη συγκέντρωση της γλουταεθιόνης και της χοληστερόλης. Στο επόμενο στάδιο, λιγνόνια που απομονώθηκαν από το φλοιό και τον καρπό του σησαμιού και μίγμα πολυφαινολών που απομονώθηκε από το φλοιό ελέγχθηκαν για την επίδρασή τους στη λιπιδική υπεροξείδωση, τη δραστικότητα της ισορροφής 1-1 της ηπατικής GST, τη 15-λιποξυγενάση και την αντιμεταλλαξιγόνο δράση τους. Σύμφωνα με τ'αποτελέσματα, ο φλοιός και ο καρπός του σησαμιού αποτελούν πηγή ενώσεων με έντονη ενεργητική δράση
description: This main purpose of this study was to search for some of the effects of feeding with sesame on the expression of the main isoenzymes of rat liver transferase of glutathione. For this purpose three different methods were used; biochemical, northern blotting and immunoblotting. In addition, the effects of feeding with sesame on the activity of the enzyme EROD and on the concentration of glutothione were investigated. Our next step was to reveal some of the biological properties of suvbtances isolated from sesame seed and perisperm polyphenolic mixture extracted from sesameseed perisperm and lignons isolated from sesameseed and perisperm were investigated for their action on lipid peroxidation, the activity of the hepatic GST 1-1, on 15-lipoxygenase activity and their antimutagenic properties
Constraints on the Geometry of the VHE Emission in LS 5039 from Photon-Photon Deabsorption
Creators: name: Boettcher, Markus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A detailed parameter study of the gamma-gamma absorption effects in LS 5039 is presented. For a range of plausible locations of the VHE gamma-ray emission region and the allowable range of viewing angles, the de-absorbed, intrinsic VHE gamma-ray spectra and total VHE photon fluxes and luminosities are calculated and compared to luminosity constraints based on wind accretion onto the compact object in LS 5039. It is found that (1) it is impossible to choose the viewing angle and location of the VHE emission region in a way that the intrinsic (deabsorbed) fluxes and spectra in superior and inferior conjunction are identical; consequently, the intrinsic VHE luminosities and spectral shapes must be fundamentally different in different orbital phases, (2) if the VHE luminosity is limited by wind accretion from the companion star and the system is viewed at an inclination angle of i > 40 deg., the emission is most likely beamed by a larger Doppler factor than inferred from the dynamics of the large-scale radio outflows, (3) the still poorly constrained viewing angle between the line of sight and the jet axis is most likely substantially smaller than the maximum of ~ 64 deg. inferred from the lack of eclipses.(4) Consequently, the compact object is more likely to be a black hole rather than a neutron star. (5) There is a limited range of allowed configurations for which the expected > 1 TeV neutrino flux would actually anti-correlate with the observed VHE gamma-ray emission. If hadronic models for the gamma-ray production in LS 5039 apply, a solid detection of the expected VHE neutrino flux and its orbital modulation with km^3 scale water-Cherenkov neutrino detectors might require the accumulation of data over more than 3 years.
description: Final, accepted version, to appear in Astroparticle Physics. 16 pages, including 7 color eps figures and 2 tables. Now includes extended discussion about neutrino detection prospects, alternative NS models
Non-photonic emission from gamma-ray bursts
Creators: name: Waxman, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: gamma-ray bursts (GRBs) are likely sources of ultra-high energy, >10^{19} eV, protons and high energy, >1 TeV, neutrinos. Large volume detectors of ultra high energy cosmic rays (UHECRs) and high energy neutrinos, which are already operating and are being expanded, may allow to test in the coming few years the predictions of the GRB model for high energy proton and neutrino production. Detection of the predicted signals will allow to identify the sources of UHECRs and will provide a unique probe, which may allow to resolve open questions related to the underlying physics of GRB models. Moreover, detection of GRB neutrinos will allow to test for neutrino properties (e.g., flavor oscillations for which tau's would be a unique signature, and coupling to gravity) with an accuracy many orders of magnitude better than is currently possible.
description: contribution to the proc. of the Sixteenth Maryland Astrophysics Conference (was not posted earlier by mistake)
Rough translation of file 030_B (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-090915-05: rough translation (30 second to 3-4 minute chunks) of file 030_B (tape 30, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 39:28 to end of file; no transcription in this session, translation only. Due to re-numbering, tape 030_B has been assigned to the CLA item number LA256.030, audio file LA256.030B.
Affinoid Dixmier modules and the deformed Dixmier-Moeglin equivalence
Creators: name: Jones, Adam
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: Number Theory (math.NT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16G30, 17B30, 17B35, 16D70, 22E35

description: The affinoid envelope, $\widehat{U(\mathcal{L})}$ of a free, finitely generated $\mathbb{Z}_p$-Lie algebra $\mathcal{L}$ has proven to be useful within the representation theory of compact $p$-adic Lie groups. Our aim is to further understand the algebraic structure of $\widehat{U(\mathcal{L})}$, and to this end, we will define a Dixmier module over $\widehat{U(\mathcal{L})}$, and prove that this object is generally irreducible in case where $\mathcal{L}$ is nilpotent. Ultimately, we will prove that all primitive ideals in the affinoid envelope can be described in terms of the annihilators of Dixmier modules, and using this, we aim towards proving that these algebras satisfy a version of the classical Dixmier-Moeglin equivalence.
description: 52 pages, Algebr Represent Theor (2021)
Evidence for Shocked Molecular Gas in the Galactic SNR CTB 109 (G109.1-1.0)
Creators: name: Sasaki, Manami
name: Kothes, Roland
name: Plucinsky, Paul P.
name: Gaetz, Terrance J.
name: Brunt, Christopher M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection of molecular clouds around the X-ray bright interior feature in the Galactic supernova remnant (SNR) CTB 109 (G109.1-1.0). This feature, called the Lobe, has been previously suggested to be the result of an interaction of the SNR shock wave with a molecular cloud complex. We present new high resolution X-ray data from the Chandra X-ray Observatory and new high resolution CO data from the Five College Radio Observatory which show the interaction region with the cloud complex in greater detail. The CO data reveal three clouds around the Lobe in the velocity interval -57 < v < -52 km s^-1. The velocity profiles of 12CO at various parts of the east cloud are well fit with a Gaussian; however, at the position where the CO cloud and the Lobe overlap, the velocity profile has an additional component towards higher negative velocities. The molecular hydrogen density in this part of the cloud is relatively high (N_H2 = 1.9 x 10^20 cm^-2), whereas the foreground absorption in X-rays (N_H = 4.5 x 10^21 cm^-2), obtained from Chandra data, is lower than in other parts of the cloud and in the north and south cloud. These results indicate that this cloud has been hit by the SNR blast wave on the western side, forming the bright X-ray Lobe.
description: Accepted for publication in ApJL. 3 figures
Modulation-Slippage Tradeoff in Resonant Four-Wave Upconversion
Creators: name: Griffith, Alec
name: Qu, Kenan
name: Fisch, Nathaniel J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Following up on a proposal to use four-wave mixing in an underdense plasma at mildly relativistic laser intensities to produce vastly more energetic x-ray pulses [V. M. Malkin and N. J. Fisch, Phys. Rev. E, 101, 023211 (2020)], we perform the first numerical simulations in one dimension to demonstrate amplification of a short high frequency seed through four-wave mixing. We find that parasitic processes including phase modulation and spatial pulse slippage limit the amplification efficiency. We numerically explore the previously proposed "dual seed" configuration as a countermeasure against phase modulation. We show how this approach tends to be thwarted by longitudinal slippage. In the examples we considered, the best performance was in fact achieved through optimization of signal and pump parameters in a "single seed" configuration.