cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Analysis of the reconstructibility and noise properties of scattered photons in Tc SPECT
Creators: name: Kadrmas, Dan J
name: Tsui, Benjamin M W
name: Frey, Eric C
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1997

description: Since scattered photons carry degraded spatial information, scatter is typically considered a source of contamination in SPECT. However, with the advent of scatter modeling methods and reconstruction-based scatter compensation (RBSC), it may be possible to utilize scattered data in a productive manner. In this work we analyze the reconstructibility of scattered photon projection data and investigate the potential for using scattered photons to reduce the noise levels of SPECT images. We have simulated projection data for an elliptical phantom containing three cold rods in a uniform background of Tc-99m activity. A variety of photopeak and scatter energy windows were formed, as well as corresponding RBSC transfer matrices. Each statistically weighted matrix was decomposed using SVD and analyzed in terms of reconstructibility and noise properties. Results indicate that scattered photons contain sufficient information to reconstruct the source activity, but the scatter-only matrices are very poorly conditioned. We have also evaluated several methods of utilizing scattered events via RBSC, and compared them with other, idealized methods of handling scatter. It was found that scattered photons can be used productively when photopeak and non-photopeak data are separated through the use of multiple energy windows. The RBSC methods outperformed ideal scatter subtraction, but fell short of methods which assume perfect discrimination between scattered and primary events. The knowledge gained by this study may help guide future research and lead to better approaches to handling scatter in SPECT.
Bemerkungen zu den Leipziger Kantatenaufführungen vom 3. bis 6. Sonntag nach Trinitatis 1725
Creators: name: Glöckner, Andreas
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Der Beitrag befasst sich mit dem Zeitraum vom 17. Juni bis 8. Juli 1725, in dem weder eigene noch fremde Kompositionen aus Bachs Notenbibliothek überliefert sind. Vor diesem Hintergrund werden Überlegungen zu Bachs Verwendung fremder Kompositionen wie zum Vorgehen bei Abwesenheiten Bachs in Leipzig angestellt. Erwähnter Artikel: Wolf Hobohm: Neue “Texte zur Leipziger Kirchen-Music”. BJ 1973, S. 5-32
description: Bach-Jahrbuch, Bd. 78 (1992)
Colloquium: Graphene spectroscopy
Creators: name: Basov, D. N.
name: Fogler, M. M.
name: Lanzara, A.
name: Wang, Feng
name: Zhang, Yuanbo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spectroscopic studies of electronic phenomena in graphene are reviewed. A variety of methods and techniques are surveyed, from quasiparticle spectroscopies (tunneling, photoemission) to methods probing density and current response (infrared optics, Raman) to scanning probe nanoscopy and ultrafast pump-probe experiments. Vast complimentary information derived from these investigations is shown to highlight unusual properties of Dirac quasiparticles and many-body interaction effects in the physics of graphene.
description: 36 pages, 16 figures
Effective portals to heavy neutral leptons
Creators: name: Fernández-Martínez, Enrique
name: González-López, Manuel
name: Hernández-García, Josu
name: Hostert, Matheus
name: López-Pavón, Jacobo
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The existence of right-handed neutrinos, or heavy neutral leptons (HNLs), is strongly motivated by the observation of neutrino masses and mixing. The mass of these new particles could lie below the electroweak scale, making them accessible to low-energy laboratory experiments. Additional new physics at high energies can mediate new interactions between the Standard Model particles and HNLs, and is most conveniently parametrized by the neutrino Standard Model Effective Field Theory, or $ν$SMEFT for short. In this work, we consider the dimension six $ν$SMEFT operators involving one HNL field in the mass range of $\mathcal{O}(1)$ MeV $
description: 28 pages + appendices, 12 figures.v2: published in JHEP, no relevant changes. Bounds and plots can be found in https://github.com/mhostert/Heavy-Neutrino-Limits
Detecting of a Patient's Condition From Clinical Narratives Using Natural Language Representation
Creators: name: Le, Thanh-Dung
name: Noumeir, Rita
name: Rambaud, Jerome
name: Sans, Guillaume
name: Jouvet, Philippe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The rapid progress in clinical data management systems and artificial intelligence approaches enable the era of personalized medicine. Intensive care units (ICUs) are the ideal clinical research environment for such development because they collect many clinical data and are highly computerized environments. We designed a retrospective clinical study on a prospective ICU database using clinical natural language to help in the early diagnosis of heart failure in critically ill children. The methodology consisted of empirical experiments of a learning algorithm to learn the hidden interpretation and presentation of the French clinical note data. This study included 1386 patients' clinical notes with 5444 single lines of notes. There were 1941 positive cases (36 % of total) and 3503 negative cases classified by two independent physicians using a standardized approach. The multilayer perceptron neural network outperforms other discriminative and generative classifiers. Consequently, the proposed framework yields an overall classification performance with 89 % accuracy, 88 % recall, and 89 % precision. This study successfully applied learning representation and machine learning algorithms to detect heart failure from clinical natural language in a single French institution. Further work is needed to use the same methodology in other institutions and other languages.
description: Accepted for publication in IEEE Open Journal of Engineering in Medicine and Biology. arXiv admin note: text overlap with arXiv:2104.03934
Archaeological Survey at the Prime Ribs Training Area, Lackland Air Force Base Training Annex, Bexar County, Texas
Creators: name: Petraglia, Michael D.
name: Knepper, Dennis A.
Publisher: name: Lackland Air Force Base
Year: 1993
Subjects: subject: Lackland Air Force Base Training Annex
valueUri: https://core.tdar.org/browse/geographic-keyword/78973/lackland-air-force-base-training-annex
subject: 48029 (Fips Code)
valueUri: https://core.tdar.org/browse/geographic-keyword/4148/48029-fips-code
subject: Bexar (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/4150/bexar-county
subject: JBSA-Lackland
valueUri: https://core.tdar.org/browse/geographic-keyword/83688/jbsa-lackland
subject: Texas (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/348/texas-state-territory
subject: Prehistoric
valueUri: https://core.tdar.org/browse/culture-keyword/120/prehistoric
subject: 41 BX 1006
valueUri: https://core.tdar.org/browse/site-name/83280/41-bx-1006
subject: Resource Extraction / Production / Transportation Structure or Features
valueUri: https://core.tdar.org/browse/site-type/272/resource-extraction-production-transportation-structure-or-features
subject: Archaeological Feature
valueUri: https://core.tdar.org/browse/site-type/339/archaeological-feature
subject: Artifact Scatter
valueUri: https://core.tdar.org/browse/site-type/340/artifact-scatter
subject: Quarry
valueUri: https://core.tdar.org/browse/site-type/293/quarry
subject: Chipped Stone
valueUri: https://core.tdar.org/browse/material-type/2/chipped-stone
subject: Historic Background Research
valueUri: https://core.tdar.org/browse/investigation-type/18/historic-background-research
subject: Site Evaluation / Testing
valueUri: https://core.tdar.org/browse/investigation-type/10/site-evaluation-testing

description: An archaeological survey of the proposed PRIME RIBS (Prime Readiness in Base Support) project area, on Lackland Air Force Base Training Annex, Bexar County, Texas has been performed. The cultural resources survey was conducted in compliance with federal and state regulations. The survey of the 20 acre area consisted of a pedestrian walkover and a stratified subsurface shovel testing strategy. During the survey, a prehistoric archaeological site of unknown temporal affiliation was identified. The site contained chipped stone artifacts, variably spread over the entire 20 acre project area. The stone artifacts consisted of debitage and tools produced from chert and chalcedony. The site represents aboriginal quarrying of natural gravels. The artifacts occur in shallow sedimentary deposits, which have subsequently been disturbed by a variety of modem ground modifications. Because the site lacks depositional integrity, no further archaeological work is recommended.
Fast implementations of reconstruction-based scatter compensation in fully 3D SPECT image reconstruction
Creators: name: Kadrmas, Dan J
name: Karimi, Seemeen S
name: Tsui, Benjamin M W
name: Frey, Eric C
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1998

description: Accurate scatter compensation in SPECT can be performed by modeling the scatter response function during the reconstruction process. This method is called reconstruction-based scatter compensation (RBSC). It has been shown that RBSC has a number of advantages over other methods of compensating for scatter, but using RBSC for fully 3D compensation has resulted in prohibitively long reconstruction times. In this work we propose two new methods that can be used in conjunction with existing methods to achieve marked reductions in RBSC reconstruction times. The first method, Coarse-Grid Scatter Modeling, significantly accelerates the scatter model by exploiting the fact that scatter is dominated by low frequency information. The second method, Intermittent RBSC, further accelerates the reconstruction process by limiting the number of iterations during which scatter is modeled. The fast implementations were evaluated using a Monte Carlo simulated experiment of the 3D MCAT phantom with Tc-99m tracer, and also using experimentally acquired data with Tl-201 tracer. Results indicated that these fast methods can reconstruct, with fully 3D compensation, images very similar to those obtained using conventional RBSC methods, and in reconstruction times that are an order of magnitude shorter. Using these methods, fully 3D iterative reconstruction with RBSC can be performed well within the realm of clinically realistic times (under 10 minutes for 64 × 64 × 24 image reconstruction).
Die "Annuae Literae" der Leipziger Jesuiten 1719-1740: Ein Bach-Dokument?
Creators: name: Stockigt, Janice B.
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Die Tagebücher der Leipziger Jesuiten geben Auskunft über einige musikalische Details der Leipziger katholischen Kapelle, die ab 1710 bestand.
description: Bach-Jahrbuch, Bd. 78 (1992)
Quantum Correlations of Helicity Entangled States in Non-inertial Frames Beyond Single Mode Approximation
Creators: name: Harsij, Zeynab
name: Mirza, Behrouz
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A helicity entangled tripartite state is considered in which the degree of entanglement is preserved in non-inertial frames. It is shown that Quantum Entanglement remains observer independent. As another measure of quantum correlation, Quantum Discord has been investigated. It is explicitly shown that acceleration has no effect on the degree of quantum correlation for the bipartite and tripartite helicity entangled states. Geometric Quantum Discord as a Hilbert-Schmidt distance is computed for helicity entangled states. It is shown that living in non-inertial frames does not make any influence on this distance, either. In addition, the analysis has been extended beyond single mode approximation to show that acceleration does not have any impact on the quantum features in the limit beyond the single mode. As an interesting result, while the density matrix depends on the right and left Unruh modes, the Negativity as a measure of Quantum Entanglement remains constant. Also, Quantum Discord does not change beyond single mode approximation.
description: 12 pages,5 figures
Comment on "Massive electrodynamics and the magnetic monopoles"
Creators: name: Dunia, Michael
name: Evans, Tim
name: Singleton, Douglas
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper we correct previous work on magnetic charge plus a photon mass. We show that contrary to previous claims this system has a very simple, closed form solution which is the Dirac string potential multiplied by a exponential decaying part. Interesting features of this solution are discussed, namely, (i) the Dirac string becomes a real feature of the solution, (ii) the breaking of gauge symmetry via the photon mass leads to a breaking of the rotational symmetry of the monopole's magnetic field, (iii) the Dirac quantization condition is potentially altered.
description: 20 pages no figures; revtex 4. Title changed to 'Comment on "Massive electrodynamics and the magnetic monopoles"' to match published version in PRD. Comment/correction to [A. Yu. Ignatiev and G. C. Joshi, Phys. Rev. D 53, 984-992 (1996)]. Added references and typos fixed
Simultaneous technetium-99m/thallium-201 SPECT imaging with model-based compensation for cross-contaminating effects
Creators: name: Kadrmas, Dan J
name: Frey, Eric C
name: Tsui, Benjamin M W
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1999

description: Simultaneous acquisition of dual-isotope SPECT data offers a number of advantages over separately acquired data; however, simultaneous acquisition can result in cross-contamination between isotopes. In this work we propose and evaluate two frameworks for iterative model-based compensation of cross-contamination in dual-isotope SPECT. The methods were applied to cardiac imaging with Technetium-99m-sestamibi and Thallium-201, and they were compared to a subtraction-based compensation method using a cross-talk estimate obtained from an auxiliary energy window. Monte Carlo simulations were performed to carefully study aspects of bias and noise for the methods, and a torso phantom with cardiac insert was used to evaluate the performance of the methods for experimentally acquired data. The cross-talk compensation methods substantially improved lesion contrast and significantly reduced quantitative errors for simultaneously acquired data. Thallium image normalized mean square error (NMSE) was reduced from 0.522 without cross-talk compensation to as low as 0.052 with model-based cross-talk compensation. This is compared to a NMSE of 0.091 for the subtraction-based compensation method. The application of a preliminary model for crosstalk arising from lead fluorescence x-rays and collimator scatter gave promising results, and the future development of a more accurate model for collimator interactions would likely benefit simultaneous Tc/Tl imaging. Model-based compensation methods provide feasible cross-talk compensation in clinically acceptable times, and they may ultimately make simultaneous dual-isotope protocols an effective alternative for many imaging procedures.
Bachs Potsdam-Besuch in den "Franckfurter Gazetten"
Creators: name: Scior, Heinz
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Der gesuchte Bericht ist in den untersuchten Zeitungen nicht enthalten. Vergleiche auch: Markus Rathey: Bachs Besuch in Potsdam und dessen Rezeption in der Münchner Presse. BJ 2011, S. 269-272
description: Bach-Jahrbuch, Bd. 78 (1992)
Archaeological Testing (Phase II) of Prehistoric Site 41 BX 785 for the West Salado Creek Outfall Project, Bexar County, Texas
Creators: name: Burkett, Ronald W.
Publisher: name: Center for Archaeological Research, The University of Texas at San Antonio
Year: 1989
Subjects: subject: Salado Creek
valueUri: https://core.tdar.org/browse/geographic-keyword/6847/salado-creek
subject: 48029 (Fips Code)
valueUri: https://core.tdar.org/browse/geographic-keyword/4148/48029-fips-code
subject: San Antonio
valueUri: https://core.tdar.org/browse/geographic-keyword/4149/san-antonio
subject: Bexar (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/4150/bexar-county
subject: Texas (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/348/texas-state-territory
subject: Prehistoric
valueUri: https://core.tdar.org/browse/culture-keyword/120/prehistoric
subject: 41 BX 785
valueUri: https://core.tdar.org/browse/site-name/83442/41-bx-785
subject: Archaeological Feature
valueUri: https://core.tdar.org/browse/site-type/339/archaeological-feature
subject: Artifact Scatter
valueUri: https://core.tdar.org/browse/site-type/340/artifact-scatter
subject: Hearth
valueUri: https://core.tdar.org/browse/site-type/343/hearth
subject: Chipped Stone
valueUri: https://core.tdar.org/browse/material-type/2/chipped-stone
subject: Fire Cracked Rock
valueUri: https://core.tdar.org/browse/material-type/5/fire-cracked-rock
subject: Data Recovery / Excavation
valueUri: https://core.tdar.org/browse/investigation-type/5/data-recovery-excavation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management
subject: Site Evaluation / Testing
valueUri: https://core.tdar.org/browse/investigation-type/10/site-evaluation-testing

description: During October and November 1988, subsurface testing (Phase II) was conducted at prehistoric site 41 BX 785, found in the West Salado Creek Outfall pipeline easement during a pedestrian survey (Phase I) of the project area. The Phase II limited testing determined that the subsurface portion of the prehistoric site is essentially intact, and at least two stratified occupation levels were identified. Although the tests did not produce diagnostic (datable) cultural materials, there is a notable amount of stone tool debitage in the central area, some unidentified biface fragments and burned rock which probably represents displaced hearth stones. We believe the site to be potentially eligible for consideration as a State Archaeological Landmark and for nomination to the National Register of Historic Places. Because the site lies within the pipeline easement and will be impacted by the installation of the pipeline, and since it is a potentially significant cultural resource, we recommend that the site be considered for mitigation.
Upper level sets of Lelong numbers on $\mathbb P^2$ and cubic curves
Creators: name: Kişisel, Ali Ulaş Özgür
name: Yazici, Ozcan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: Let $T$ be a positive closed current of bidimension $(1,1)$ with unit mass on $\mathbb P^2$ and $V_α(T)$ be the upper level sets of Lelong numbers $ν(T,x)$ of $T$. For any $α\geq \frac{1}{3}$, we show that $|V_α(T)\setminus C|\leq 2$ for some cubic curve $C$.
Zur Sarabande aus dem Solo für die Flöte (BWV 1013)
Creators: name: Toeplitz, Uri
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Eine eingehende Analyse untersucht die Struktur der Sarabande der a-moll-Partita BWV 1013. Erwähnte Artikel: Hans Hering: Spielerische Elemente in J. S. Bachs Klaviermusik. BJ 1974, S. 44-69 Hans Eppstein: Chronologieprobleme in Johann Sebastian Bachs Suiten für Soloinstrument. BJ 1976, S. 35-57
description: Bach-Jahrbuch, Bd. 78 (1992)
Response from Joseph Logan to Scott Shepherd, Building 526, Randolph Air Force Base, Texas
Creators: name: Shepherd, Scott B.
Publisher: name: Department of the Air Force, Randolph Air Force Base
Year: 1993
Subjects: subject: San Antonio
valueUri: https://core.tdar.org/browse/geographic-keyword/4149/san-antonio
subject: Bexar (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/4150/bexar-county
subject: Texas
valueUri: https://core.tdar.org/browse/geographic-keyword/6923/texas
subject: Randolph Air Force Base
valueUri: https://core.tdar.org/browse/geographic-keyword/78971/randolph-air-force-base
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/318/governmental-structure
subject: Historic Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/320/historic-governmental-structure
subject: Building 526
valueUri: https://core.tdar.org/browse/other-keyword/153013/building-526
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: Email addressing specifics and concerns about a proposed demolition of Building 526, Randolph Air Force Base, Texas. This letter is part of a packet of correspondence concerning the proposed demolition of Building 526, Randolph Air Force Base, Texas. Attachments include engineering reports, description, and location map.
Vorticity and magnetic dynamo from subsonic expansion waves
Creators: name: Elias-López, Albert
name: Del Sordo, Fabio
name: Viganò, Daniele
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This work concentrates on the effect of an irrotational forcing on a magnetized flow in the presence of rotation, baroclinicity, shear, or a combination of them. By including magnetic field in the model we can evaluate the occurrence of dynamo on both small and large scales. We aim at finding what are the minimum ingredients needed to trigger a dynamo instability and what is the relation between dynamo and the growth of vorticity. We use the Pencil code to run resistive MHD direct numerical simulations. We report no dynamo in all cases where only rotation is included, regardless on the equation of state. Conversely, the inclusion of a background sinusoidal shearing profile leads to an hydrodynamic instability that produces an exponential growth of the vorticity at all scales, starting from small ones. This is know as vorticity dynamo. The onset of this instability occurs after a rather long temporal evolution of several thousand turbulent turnover times. The vorticity dynamo in turn drives an exponential growth of the magnetic field, first at small scales, then also at large one. The instability then saturates and the magnetic field approximately reaches equipartition with the turbulent kinetic energy. During the saturation phase we can observe a winding of the magnetic field in the direction of the shearing flow. By varying the intensity of the shear we see that the growth rates of this instability change. The inclusion of the baroclinic term delays the onset of the vorticity dynamo but leads to a more rapid growth. We demonstrate how in the presence of shear, even a purely irrotational forcing amplifies the field to equipartition. At the same time, we confirm how this forcing alone does not lead to vorticity nor magnetic field growth, and this picture does not change in the presence of rotation or baroclinicity up to $256^3$ meshpoints.
description: 14 pages, 8 figures, submitted for publication, comments welcome
Resonant acoustic spectroscopy of soft tissues using embedded magnetomotive nanotransducers and optical coherence tomography
Creators: name: Boppart, Stephen A
name: Oldenburg, Amy L
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: We present a new method for performing dynamic elastography of soft tissue samples. By sensing nanoscale displacements with optical coherence tomography, a chirped, modulated force is applied to acquire the mechanical spectrum of a tissue sample within a few seconds. This modulated force is applied via magnetic nanoparticles, named ‘nanotransducers’, which are diffused into the tissue, and which contribute negligible inertia to the soft tissue mechanical system. Using this novel system, we observed that excised tissues exhibit mechanical resonance modes which are well described by a linear damped harmonic oscillator. Results are validated by using cylindrical tissue phantoms of agarose in which resonant frequencies (30–400 Hz) are consistent with longitudinal modes and the sample boundary conditions. We furthermore show that the Young’s modulus can be computed from their measured resonance frequencies, analogous to resonant ultrasound spectroscopy for stiff material analysis. Using this new technique, named magnetomotive resonant acoustic spectroscopy (MRAS), we monitored the relative stiffening of an excised rat liver during a chemical fixation process.
Image reconstruction from limited angle projections collected by multisource interior x-ray imaging systems
Creators: name: Liu, Baodong
name: Wang, Ge
name: Zhou, Otto
name: Lu, Jianping
name: Yu, Hengyong
name: Zeng, Li
name: Ritman, Erik L
name: Cao, Guohua
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: A multi-source x-ray interior imaging system with limited angle scanning is investigated to study the possibility of building an ultra-fast micro-CT for dynamic small animal imaging. And two methods are employed to perform interior reconstruction from a limited number of projections collected by the multi-source interior x-ray system. The first is total variation minimization with the steepest descent search (TVM-SD) and the second is total difference minimization with soft-threshold filtering (TDM-STF). Comprehensive numerical simulations and animal studies are performed to validate the associated reconstructed methods and demonstrate the feasibility and application of the proposed system configuration. The image reconstruction results show that both of the two reconstruction methods can significantly improve the image quality and the TDM-SFT is slightly superior to the TVM-SD. Finally, quantitative image analysis shows it is possible to make an ultra-fast micro-CT using a multi-source interior x-ray system scheme combined with the state-of-the-art interior tomography.
Adiabatic pumping and transport in the Sierpinski-Hofstadter model
Creators: name: Sarangi, Saswat
name: Nielsen, Anne E. B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Topological phases have been reported on self-similar structures in the presence of a perpendicular magnetic field. Here, we present an understanding of these phases from a perspective of spectral flow and charge pumping. We study the Harper-Hofstadter model on self-similar structures constructed from the Sierpinski gasket. We numerically investigate the spectral flow and the associated charge pumping when a flux tube is inserted through the structure and the flux through the tube is varied adiabatically. We find that the nature of the spectral flow is qualitatively different from that of translationally invariant non-interacting systems with a perpendicular magnetic field. We show that the instantaneous eigenspectra can be used to understand the quantization of the charge pumped over a cycle, and hence to understand the topological character of the system. We show the correspondence between the local contributions to the Hall conductivity and the spectral flow of the edge-like states. We also show that the edge-like states can be approximated by eigenstates of the discrete angular-momentum operator, their chiral nature being a consequence of this.
description: 13 pages, 10 figures
Letter from Tad Stanley to Curtis Tunnell, Proposal for Handicapped Access Chapel 1 Building 102, Randolph Air Force Base, Texas
Creators: name: Stanley, Tad A.
Publisher: name: Department of the Air Force, Randolph Air Force Base
Year: 1989
Subjects: subject: Randolph Field Historic Landmark District
valueUri: https://core.tdar.org/browse/geographic-keyword/83364/randolph-field-historic-landmark-district
subject: San Antonio
valueUri: https://core.tdar.org/browse/geographic-keyword/4149/san-antonio
subject: Bexar (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/4150/bexar-county
subject: Texas
valueUri: https://core.tdar.org/browse/geographic-keyword/6923/texas
subject: Randolph Air Force Base
valueUri: https://core.tdar.org/browse/geographic-keyword/78971/randolph-air-force-base
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/318/governmental-structure
subject: Historic Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/320/historic-governmental-structure
subject: Non-Domestic Structures
valueUri: https://core.tdar.org/browse/site-type/309/non-domestic-structures
subject: Chapel 1
valueUri: https://core.tdar.org/browse/other-keyword/157280/chapel-1
subject: NRHP
valueUri: https://core.tdar.org/browse/other-keyword/9857/nrhp
subject: National Register of Historic Places
valueUri: https://core.tdar.org/browse/other-keyword/1572/national-register-of-historic-places
subject: Building 102
valueUri: https://core.tdar.org/browse/other-keyword/146231/building-102
subject: Main Chapel
valueUri: https://core.tdar.org/browse/other-keyword/158921/main-chapel
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: A detailed proposal sent to the Texas Historical Commission to request approval for handicapped access to Building 102, the Main Chapel, at Randolph Air Force Base, Texas. This letter is part of a large packet of correspondence addressing the proposed undertaking to grant handicapped access to Building 102, Main Chapel or Chapel 1, Randolph Air Force Base, Texas. Included in the packet are letters and notes.
Learning image context for segmentation of the prostate in CT-guided radiotherapy
Creators: name: Liao, Shu
name: Li, Wei
name: Feng, Qianjin
name: Shen, Dinggang
name: Chen, Wufan
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: Accurate segmentation of prostate is the key to the success of external beam radiotherapy of prostate cancer. However, accurate segmentation of prostate in computer tomography (CT) images remains challenging mainly due to three factors: (1) low image contrast between the prostate and its surrounding tissues, (2) unpredictable prostate motion across different treatment days, and (3) large variations of intensities and shapes of bladder and rectum around the prostate. In this paper, an online-learning and patient-specific classification method based on the location-adaptive image context is presented to deal with all these challenging issues and achieve the precise segmentation of prostate in CT images. Specifically, two sets of location-adaptive classifiers are placed, respectively, along the two coordinate directions of the planning image space of a patient, and further trained with the planning image and also the previous-segmented treatment images of the same patient to jointly perform prostate segmentation for a new treatment image (of the same patient). In particular, each location-adaptive classifier, which itself consists of a set of sequential sub-classifiers, is recursively trained with both the static image appearance features and the iteratively-updated image context features (extracted at different scales and orientations) for better identification of each prostate region. The proposed learning-based prostate segmentation method has been extensively evaluated on 161 images of 11 patients, each with more than 9 daily treatment 3D CT images. Our method achieves the mean Dice value 0.908 and the mean ± SD of average surface distance (ASD) value 1.40 ± 0.57 mm. Its performance is also compared with three prostate segmentation methods, indicating the best segmentation accuracy by the proposed method among all methods under comparison.
Contrast-enhanced imaging of SPIO-labeled platelets using magnetomotive ultrasound
Creators: name: Czernuszewicz, Tomasz J
name: Wu, Gongting
name: Merricks, Elizabeth P
name: Oldenburg, Amy L
name: Pope, Ava G
name: Gallippi, Caterina M
name: McWhorter, Frances Y
name: Nichols, Timothy C
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: The ability to image platelets in vivo can provide insight into blood clotting processes and coagulopathies, and aid in identifying sites of vascular endothelial damage related to trauma or cardiovascular disease. Toward this end, we have developed a magnetomotive ultrasound (MMUS) system that provides contrast-enhanced imaging of superparamagnetic iron oxide (SPIO) labeled platelets via magnetically-induced vibration. Platelets are a promising platform for functional imaging contrast because they readily take up SPIOs and are easily harvested from blood. Here we report a novel MMUS system that accommodates an arbitrarily thick sample while maintaining portability. We employed a frequency- and phase-locked motion detection algorithm based on bandpass filtering of the differential RF phase, which allows for the detection of sub-resolution vibration amplitudes on the order of several nanometers. We then demonstrated MMUS in homogenous tissue phantoms at SPIO concentrations as low as 0.09 mg/ml Fe (p < 0.0001, n = 6, t-test). Finally, we showed that our system is capable of 3-dimensional imaging of a 185 μL simulated clot containing SPIO-platelets. This highlights the potential utility for non-invasive imaging of platelet-rich clots, which would constitute a fundamental advance in technology for the study of hemostasis and detection of clinically relevant thrombi.
Correcting for Telluric Absorption: Methods, Case Studies, and Release of the TelFit Code
Creators: name: Gullikson, Kevin
name: Dodson-Robinson, Sarah
name: Kraus, Adam
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Ground-based astronomical spectra are contaminated by the Earth's atmosphere to varying degrees in all spectral regions. We present a Python code that can accurately fit a model to the telluric absorption spectrum present in astronomical data, with residuals of $\sim 3-5\%$ of the continuum for moderately strong lines. We demonstrate the quality of the correction by fitting the telluric spectrum in a nearly featureless A0V star, HIP 20264, as well as to a series of dwarf M star spectra near the 819 nm sodium doublet. We directly compare the results to an empirical telluric correction of HIP 20264 and find that our model-fitting procedure is at least as good and sometimes more accurate. The telluric correction code, which we make freely available to the astronomical community, can be used as a replacement for telluric standard star observations for many purposes.
description: 7 pages, 5 figures, accepted to the Astronomical Journal. The TelFit code is available from github (https://github.com/kgullikson88/Telluric-Fitter) and my personal website (http://www.as.utexas.edu/~kgulliks/projects.html)
Architectural bone parameters and the relationship to titanium lattice design for powder bed fusion additive manufacturing
Creators: name: McGregor, Martine
name: Patel, Sagar
name: McLachlin, Stewart
name: Vlasea, Mihaela
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Additive manufacturing (AM) of titanium (Ti) and Ti-6Al-4V lattices has been proposed for bone implants and augmentation devices. Ti and Ti-6Al-4V have favourable biocompatibility, corrosion resistance and fatigue strength for bone applications; yet, the optimal parameters for Ti-6Al-4V lattice designs corresponding to the natural micro- and meso-scale architecture of human trabecular and cortical bone are not well understood. A comprehensive review was completed to compare the natural lattice architecture properties in human bone to Ti and Ti-6Al-4V lattice structures for bone replacement and repair. Ti and Ti-6Al-4V lattice porosity has varied from 15% to 97% with most studies reporting a porosity between 50-70%. Cortical bone is roughly 5-15% porous and lattices with 50-70% porosity are able to achieve comparable stiffness, compressive strength, and yield strength. Trabecular bone has a reported porosity range from 70-90%, with trabecular thickness varying from 120-200 μm. Existing powder bed fusion technologies have produced strut and wall thicknesses ranging from 200-1669 μm. This suggests limited overlap between current AM of Ti and Ti-6Al-4V lattice structures and trabecular bone architecture, indicating that replicating natural trabecular bone parameters with latticing is prohibitively challenging. This review contributes to the body of knowledge by identifying the correspondence of Ti and Ti-6Al-4V lattices to the natural parameters of bone microarchitectures, and provides further guidance on the design and AM recommendations towards addressing recognized performance gaps with powder bed fusion technologies.
Resolution of the discrepancy between the variation of the physical properties of Ce1-xYbxCoIn5 single crystals and thin films with Yb composition
Creators: name: Jang, S.
name: White, B. D.
name: Lum, I. K.
name: Kim, H.
name: Tanatar, M. A.
name: Straszheim, W. E.
name: Prozorov, R.
name: Keiber, T.
name: Bridges, F.
name: Shu, L.
name: Baumbach, R. E.
name: Janoschek, M.
name: Maple, M. B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Measurements of physical properties show that Yb enters the single crystals systematically and in registry with the nominal Yb concentration x of the starting material dissolved in the molten indium flux.
description: 21 pages, 8 figures
Johann Sebastian Bach, Musikalisches Opfer (BWV 1079). Bemerkungen zum "Canon a 2 per Tonos"
Creators: name: Brügge, Joachim
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Die Analyse bemüht sich um einen versachlichenden Blick auf den behandelten Satz aus BWV 1079 und widerspricht expressis verbis den “Überinterpretationen” oder einer “plakativen Werkdeutung”.
description: Bach-Jahrbuch, Bd. 78 (1992)
Coulomb drag and heat transfer in strange metals
Creators: name: Chudnovskiy, A. L.
name: Levchenko, Alex
name: Kamenev, Alex
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We address Coulomb drag and near-field heat transfer in a double-layer system of incoherent metals. Each layer is modeled by an array of tunnel-coupled SYK dots with random inter-layer interactions. Depending on the strength of intra-dot interactions and inter-dot tunneling, this model captures the crossover from the Fermi liquid to a strange metal phase. The absence of quasiparticles in the strange metal leads to temperature-independent drag resistivity, which is in strong contrast with the quadratic temperature dependence in the Fermi liquid regime. We show that all the parameters can be independently measured in near-field heat transfer experiments, performed in Fermi liquid and strange metal regimes.
description: 5 pages, 3 figures + Supplemental Material
A study of the $K^+ \to π^0 e^+ νγ$ decay
Creators: name: The NA62 Collaboration
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A sample of $1.3 \times 10^5$ $K^+ \to π^0 e^+ νγ$ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017-2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.
Phase-transition thresholds and vaporization phenomena for ultrasound phase-change nanoemulsions assessed via high-speed optical microscopy
Creators: name: Matsunaga, Terry O
name: Sheeran, Paul S
name: Dayton, Paul A
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: Ultrasonically activated phase-change contrast agents (PCCAs) based on perfluorocarbon droplets have been proposed for a variety of therapeutic and diagnostic clinical applications. When generated at the nanoscale, droplets may be small enough to exit the vascular space and then be induced to vaporize with high spatial and temporal specificity by externally-applied ultrasound. The use of acoustical techniques for optimizing ultrasound parameters for given applications can be a significant challenge for nanoscale PCCAs due to the contributions of larger outlier droplets. Similarly, optical techniques can be a challenge due to the sub-micron size of nanodroplet agents and resolution limits of optical microscopy. In this study, an optical method for determining activation thresholds of nanoscale emulsions based on the in vitro distribution of bubbles resulting from vaporization of PCCAs after single, short (<10 cycles) ultrasound pulses is evaluated. Through ultra-high-speed microscopy it is shown that the bubbles produced early in the pulse from vaporized droplets are strongly affected by subsequent cycles of the vaporization pulse, and these effects increase with pulse length. Results show that decafluorobutane nanoemulsions with peak diameters on the order of 200 nm can be optimally vaporized with short pulses using pressures amenable to clinical diagnostic ultrasound machines.
Transverse Shifts and Time Delays of Spatiotemporal Vortex Pulses Reflected and Refracted at a Planar Interface
Creators: name: Mazanov, Maxim
name: Sugic, Danica
name: Alonso, Miguel A.
name: Nori, Franco
name: Bliokh, Konstantin Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Transverse (Hall-effect) and Goos--Hänchen shifts of light beams reflected/refracted at planar interfaces are important wave phenomena, which can be significantly modified and enhanced by the presence of intrinsic orbital angular momentum (OAM) in the beam. Recently, optical spatiotemporal vortex pulses (STVPs) carrying a purely transverse intrinsic OAM were predicted theoretically and generated experimentally. Here we consider the reflection and refraction of such pulses at a planar isotropic interface. We find theoretically and confirm numerically novel types of the OAM-dependent transverse and longitudinal pulse shifts. Remarkably, the longitudinal shifts can be regarded as time delays, which appear, in contrast to the well-known Wigner time delay, without temporal dispersion of the reflection/refraction coefficients. Such time delays allow one to realize OAM-controlled slow (subluminal) and fast (superluminal) pulse propagation without medium dispersion. These results can have important implications in various problems involving scattering of localized vortex states carrying transverse OAM.
description: 7 pages, 4 figures, to appear in Nanophotonics
Image-guided microbeam irradiation to brain tumour bearing mice using a carbon nanotube x-ray source array
Creators: name: Burk, Laurel M
name: Hadsell, Michael J
name: Chang, Sha
name: Lu, Jianping
name: Inscoe, Christy R
name: Zhang, Lei
name: Chtcheprov, Pavel
name: Zhou, Otto
name: Lee, Yueh Z
name: Yuan, Hong
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014

description: Microbeam radiation therapy (MRT) is a promising experimental and preclinical radiotherapy method for cancer treatment. Synchrotron based MRT experiments have shown that spatially fractionated microbeam radiation has the unique capability of preferentially eradicating tumour cells while sparing normal tissue in brain tumour bearing animal models. We recently demonstrated the feasibility of generating orthovoltage microbeam radiation with an adjustable microbeam width using a carbon nanotube based X-ray source array. Here we report the preliminary results from our efforts in developing an image guidance procedure for the targeted delivery of the narrow microbeams to the small tumour region in the mouse brain. Magnetic resonance imaging was used for tumour identification, and on-board X-ray radiography was used for imaging of landmarks without contrast agents. The two images were aligned using 2D rigid body image registration to determine the relative position of the tumour with respect to a landmark. The targeting accuracy and consistency were evaluated by first irradiating a group of mice inoculated with U87 human glioma brain tumours using the present protocol and then determining the locations of the microbeam radiation tracks using γ-H2AX immunofluorescence staining. The histology results showed that among 14 mice irradiated, 11 received the prescribed number of microbeams on the targeted tumour, with an average localization accuracy of 454 μm measured directly from the histology (537 μm if measured from the registered histological images). Two mice received one of the three prescribed microbeams on the tumour site. One mouse was excluded from the analysis due to tissue staining errors.
OAHP Inventory, Building 17 Terminal Equipment Building, Fort Sam Houston, Texas
Creators: name: Walter, Chelsea
Publisher: name: Office of Archaeology and Historic Preservation
Year: 1980
Subjects: subject: Fort Sam Houston
valueUri: https://core.tdar.org/browse/geographic-keyword/83681/fort-sam-houston
subject: San Antonio
valueUri: https://core.tdar.org/browse/geographic-keyword/4149/san-antonio
subject: Bexar (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/4150/bexar-county
subject: Texas
valueUri: https://core.tdar.org/browse/geographic-keyword/6923/texas
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/318/governmental-structure
subject: Historic Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/320/historic-governmental-structure
subject: Non-Domestic Structures
valueUri: https://core.tdar.org/browse/site-type/309/non-domestic-structures
subject: Building 17
valueUri: https://core.tdar.org/browse/other-keyword/146141/building-17
subject: OAHP
valueUri: https://core.tdar.org/browse/other-keyword/138292/oahp
subject: Terminal Equipment
valueUri: https://core.tdar.org/browse/other-keyword/160524/terminal-equipment
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Architectural Survey
valueUri: https://core.tdar.org/browse/investigation-type/2/architectural-survey
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: An inventory form by the Office of Archaeology and Historic Preservation for Building 17 at Fort Sam Houston, Texas. The structure was built in 1970 as a terminal equipment building. Included in the inventory are black and white photographs taken in 1980 of the structure.