cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
FISH: A 3D parallel MHD code for astrophysical applications
Creators: name: Kaeppeli, R.
name: Whitehouse, S. C.
name: Scheidegger, S.
name: Pen, U. -L.
name: Liebendoerfer, M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: FISH is a fast and simple ideal magneto-hydrodynamics code that scales to ~10 000 processes for a Cartesian computational domain of ~1000^3 cells. The simplicity of FISH has been achieved by the rigorous application of the operator splitting technique, while second order accuracy is maintained by the symmetric ordering of the operators. Between directional sweeps, the three-dimensional data is rotated in memory so that the sweep is always performed in a cache-efficient way along the direction of contiguous memory. Hence, the code only requires a one-dimensional description of the conservation equations to be solved. This approach also enable an elegant novel parallelisation of the code that is based on persistent communications with MPI for cubic domain decomposition on machines with distributed memory. This scheme is then combined with an additional OpenMP parallelisation of different sweeps that can take advantage of clusters of shared memory. We document the detailed implementation of a second order TVD advection scheme based on flux reconstruction. The magnetic fields are evolved by a constrained transport scheme. We show that the subtraction of a simple estimate of the hydrostatic gradient from the total gradients can significantly reduce the dissipation of the advection scheme in simulations of gravitationally bound hydrostatic objects. Through its simplicity and efficiency, FISH is as well-suited for hydrodynamics classes as for large-scale astrophysical simulations on high-performance computer clusters. In preparation for the release of a public version, we demonstrate the performance of FISH in a suite of astrophysically orientated test cases.
description: 27 pages, 11 figures
A new neolignan and a new phenolic acid from the heartwood of Mansonia gagei J.R. Drumm
Creators: name: Le, Huong Thi Thu
name: Yusuke, Hioki
name: Wonganan, Piyanuch
name: Le, Thi-Kim-Dung
name: Nguyen, Van-Kieu
name: Kita, Masaki
name: Chavasiri, Warinthorn
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Plant Biology

description: One new neolignan (1) and one new phenolic compound (2), together with four known compounds (3–6) were isolated from the heartwood of Mansonia gagei. Their structures were elucidated by extensive spectroscopic analyses, including 1D and 2D NMR and HRESIMS. The absolute configuration of 2 was established based on the DP4+ protocol and by comparison of experimental and calculated ECD spectra. All isolated compounds were evaluated by DPPH assay for antioxidant activity, while compounds 3–6 were assayed using the MTT-based colorimetric assay for cytotoxicity against lung cancer cell line A549. In terms of antioxidant activity, 1 and 3 exhibited stronger activity (IC50 14.91 ± 1.10 and 17.46 ± 0.16 μM, respectively) than the positive control, ascorbic acid (IC50 30.20 ± 0.47 μM). Among the compounds tested for cytotoxicity, compound 3 showed the highest activity, with an IC50 value of 26.04 ± 2.95 µM.
Studies on X-ray Thomson Scattering from Antiferroquadrupolar Order in TmTe
Creators: name: Nagao, Tatsuya
name: Shiina, Ryousuke
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study Thomson scattering from the antiferroquadrupole ordering phase in TmTe. On the basis of the group theoretical treatment, we classify the selection rules of the scattering intensity governed by the orientation of the scattering vector G. Then, numerical verification is performed by invoking the ground states which are deduced from a J=7/2 multiplet model. The obtained intensity varies drastically depending on the magnitude and direction of G. We also calculate the scattering intensities under the applied field for H//(001) and (110). Their results behave differently when the orientation of G is changed, which is ascribed to the difference of their primary order parameters; O_{2}^{0} and O_{2}^{2} for H // (001) and (110), respectively. We make critical comparisons between our results for TmTe and the experimental ones for CeB_6. First, we assert that the intensities expected from TmTe at several forbidden Bragg spots are sufficient enough to be experimentally detected. Second, their intensities at (7/2,1/2,1/2) differ significantly and may be attributed to the difference of the order parametersbetween the Γ_3-type (O_{2}^{2} and O_{2}^{0}) and Γ_5-type (O_{yz}, O_{zx}, and O_{xy}) components, respectively.
description: 18 pages, 3 figures, to be published in J. Phys. Soc. Jpn
Metabolomic profiling and correlations of supercritical extracts of guarana
Creators: name: Marques, Leila Larisa Medeiros
name: Ribeiro, Fabianne Martins
name: Nakamura, Celso Vataru
name: Simionato, Ane Stefano
name: Andrade, Galdino
name: Zielinski, Acácio Antonio Ferreira
name: Carollo, Carlos Alexandre
name: da Silva, Denise Brentan
name: de Oliveira, Admilton Gonçalves
name: de Mello, João Carlos Palazzo
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Cancer

description: A previous optimization of supercritical extraction from guarana seeds was performed applying orthogonal array design (OA9(34)). The antioxidant and antimicrobial activities of these extracts, as well as metabolomic profiling and correlations from the compounds by statistical analysis were determined. Extracts 1 (40% ethanol; 20 min; 40 °C and 100 bar), 2 (40% methanol; 60 min; 40 °C and 200 bar), and 8 (40% methanol; 40 min; 60 °C and 100 bar) had the highest combined values of antioxidant capacity for the DPPH, FRAP, ABTS and xanthine oxidase system methods, and were identified by chemometric analysis. Similar chemical profiles of the extracts were obtained by LC-DAD-MS, and were identified: methyl-xanthine, (epi)catechin and dimers and trimers of type A and B proanthocyanidins. The heat map analysis showed positive correlation between antioxidant methods DPPH, FRAP and ABTS and with flavan-3-ols and proanthocyanidins. Extract 3 was active against Gram-negative and -positive bacteria and Candida tropicalis.
1-2-3-Go! Policy Synthesis for Parameterized Markov Decision Processes via Decision-Tree Learning and Generalization
Creators: name: Azeem, Muqsit
name: Chakraborty, Debraj
name: Kanav, Sudeep
name: Kretinsky, Jan
name: Mohagheghi, Mohammadsadegh
name: Mohr, Stefanie
name: Weininger, Maximilian
Publisher: name: arXiv
Year: 2024
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Logic in Computer Science (cs.LO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Despite the advances in probabilistic model checking, the scalability of the verification methods remains limited. In particular, the state space often becomes extremely large when instantiating parameterized Markov decision processes (MDPs) even with moderate values. Synthesizing policies for such \emph{huge} MDPs is beyond the reach of available tools. We propose a learning-based approach to obtain a reasonable policy for such huge MDPs.
 The idea is to generalize optimal policies obtained by model-checking small instances to larger ones using decision-tree learning. Consequently, our method bypasses the need for explicit state-space exploration of large models, providing a practical solution to the state-space explosion problem. We demonstrate the efficacy of our approach by performing extensive experimentation on the relevant models from the quantitative verification benchmark set. The experimental results indicate that our policies perform well, even when the size of the model is orders of magnitude beyond the reach of state-of-the-art analysis tools.
description: Extended version of the paper accepted at VMCAI 2025
Millimeter Wave and 5G Multilayer 3D Integration and Packaging: Advanced Technologies and Techniques Slides
Creators: Kamal Samanta
Publisher: name: IEEE
Year: 2018

MTT Webinar Slides
There are ever-growing demand and emerging applications of millimeter-wave (mmW), including those for next-generation high-speed wireless (together with 5G) and multimedia, space/satellite, defense, automotive radar, sensors, and biomedical devices. The key challenges for making these applications feasible are realizing high-performance and highly integrated circuits/modules with ever greater functionality within a compact size and reduced mass, yet at a low cost. Recent advancement in a multilayer multi-chip module (MCM) and 3D monolithic/wafer-scale heterogeneous integration and packaging technologies are considered to be a viable solution for addressing these requirements.
This webinar will first present the integration and packaging challenges, and widely used  multilayer MCM (including LTCC, organic/laminate, and BCB/IPD) and 3D heterogeneous (including wafer level, monolithic, chiplet and wafer-bonding/epitaxial-transfer) integration/packaging techniques with their recent state-of-the-art advancements; and then will show the relative advantages and limitations, in terms of integration capability, material properties, achievable feature size, RF performance and cost. However, at m using these techniques, it is difficult to realize circuits/modules with the required compactness and quality economically. This webinar will present an advanced multilayer/3D thick-film based technology which is very straightforward, easy to fabricate, demonstrated high-performance performance at mmW at a low cost. The test results for a range of multilayer high-quality and compact passives and SIW components, circuits, and highly integrated modules will be presented, showing performance far superior to most of the reported results from MCMs, operating from 1 GHz to 180 GHz. These will include the world’s first highly compact complete 60 GHz receiver, integrating MMICs with SIW antenna and filters, lumped components, and other passives into a single substrate.
Finally, the impact of multilayer and 3D integration and packaging techniques on key parameters of a circuit/system, and the relative capabilities of 3D heterogeneous integration and multilayer MCM technologies with their application spaces will be detailed. Speaker will highlight the future trends with possible solutions for overcoming the multidisciplinary industrial challenges towards making the next-generation microwave and mm-wave applications feasible and affordable.
New Frontiers in Terahertz Technology Slides
Creators: Mona Jarrahi
Publisher: name: IEEE
Year: 2017

MTT Webinar Slides
Although unique potentials of terahertz waves for chemical identification, material characterization, biological sensing, and medical imaging have been recognized for quite a while, the relatively poor performance, higher costs, and bulky nature of current terahertz systems continue to impede their deployment in field settings. This presentation describes recent results on developing fundamentally new terahertz electronic/optoelectronic components and imaging/spectrometry architectures to mitigate performance limitations of existing terahertz systems.
Advanced 5G and SATCOM Phased-Arrays Using Silicon Technologies: The End of the Marconi Era is Near Part 2 Slides
Creators: Gabriel Rebeiz
Publisher: name: IEEE
Year: 2019

MTT Webinar Slides
During the past 50 years, phased-arrays have being largely developed for the defense sector.  Today, due to the increased demand for data, there is a need for base-station and mobile-user phased-arrays which can provide high-capacity data services through directional links. Both digital-beamforming at the element level (sub-6 GHz) and hybrid (i.e. analog/digital) beamforming for the mm-waves bands are being developed for 5G systems.  These commercial investments are leading to dramatic changes in phased-arrays: High EIRP, high-performance systems at 12, 14 GHz and 28 GHz (SATCOM), X/Ku-band (Radars), 24-30 GHz, 37-42 GHz and even 60 GHz (all for 5G), and with multiple beams, are now available at low-cost. The single most important aspect of these arrays is their use of advanced silicon technologies and planar antennas for dramatically lowering the development and unit cost. The talk will summarize the work in this area, and present a roadmap for the future.
Radio properties of the low surface brightness SNR G65.2+5.7
Creators: name: Xiao, L.
name: Reich, W.
name: Fürst, E.
name: Han, J. L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Many physical properties of this SNR such as spectrum and polarization can only be investigated by radio observations. The $λ$11 cm and $λ$6\ cm continuum and polarization observations of SNR G65.2+5.7 were made with the Effelsberg 100-m and the Urumqi 25-m telescopes, respectively, to investigate the integrated spectrum, the spectral index distribution, and the magnetic field properties. $λ$21 cm archival data from the Effelsberg 100-m telescope have been also used. The integrated flux densities of G65.2+5.7 at $λ11$ cm and $λ6$ cm are $21.9\pm3.1$ Jy and 16.8$\pm$1.8 Jy, respectively. The power-law spectrum ($S\simν^α$) is well fitted by $α= -0.58\pm0.07$ from 83 MHz to 4.8 GHz. Spatial spectral variations are small. Along the northern shell strong depolarizion is observed at both wavelengths. The southern filamentary shell of SNR G65.2+5.7 is polarized up to 54% at $λ6$ cm. There is significant depolarization at $λ11$ cm and confusion with diffuse polarized Galactic emission. Using equipartition principle, we estimated the magnetic field strength for the southern filamentary shell about 20 $μ$G (filling factor 1) to 50 $μ$G (filling factor 0.1). A faint HI shell may be associated with the SNR. Despite its unusual strong X-ray and optical emission and its very low surface brightness, the radio properties of SNR G65.2+5.7 are found to be typical for evolved shell type SNRs. SNR G65.2+5.7 may be expanding in a preblown cavity as indicated by a deficit of HI gas and a possible HI-shell.
description: 11pages,13figures,accepted by A&A, revised following the language editor. For high resolution version, please go to ftp://ftp.mpifr-bonn.mpg.de/outgoing/p098wre/xiao-etal-g65.pdf
Classifying Bicycle Infrastructure Using On-Bike Street-Level Images
Creators: name: Backman, Kal
name: Beck, Ben
name: Kulić, Dana
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: While cycling offers an attractive option for sustainable transportation, many potential cyclists are discouraged from taking up cycling due to the lack of suitable and safe infrastructure. Efficiently mapping cycling infrastructure across entire cities is necessary to advance our understanding of how to provide connected networks of high-quality infrastructure. Therefore we propose a system capable of classifying available cycling infrastructure from on-bike smartphone camera data. The system receives an image sequence as input, temporally analyzing the sequence to account for sparsity of signage. The model outputs cycling infrastructure class labels defined by a hierarchical classification system. Data is collected via participant cyclists covering 7,006Km across the Greater Melbourne region that is automatically labeled via a GPS and OpenStreetMap database matching algorithm. The proposed model achieved an accuracy of 95.38%, an increase in performance of 7.55% compared to the non-temporal model. The model demonstrated robustness to extreme absence of image features where the model lost only 6.6% in accuracy after 90% of images being replaced with blank images. This work is the first to classify cycling infrastructure using only street-level imagery collected from bike-mounted mobile phone cameras, while demonstrating robustness to feature sparsity via long temporal sequence analysis.
description: 8 pages, 6 figures, presented at ITSC 2024
A Prescription for On-Wafer Millimeter-Wave and THz Transistor Characterization Questions Part 2 Slides
Creators: Dylan Williams
Publisher: name: IEEE
Year: 2016

MTT Webinar Slides
Advances in microwave wafer probes and vector network analyzers now make possible accurate on-wafer measurements in printed transmission lines at microwave, millimeter-wave, sub-millimeter-wave, and even terahertz frequencies. Dr. Dylan Williams, winner of the 2013 IEEE Joseph F. Keithley Award in Instrumentation and Measurement, will introduce you to the progress made on this subject at the National Institute of Standards and Technology. He will discuss the fundamental principles behind accurate on-wafer measurements, and show how adhering to these principles has led to the development of accurate on-wafer measurements for transistor characterization at frequencies as high as 1 THz.
A reliable validated high-performance liquid chromatography-photodiode array detection method for quantification of terpenes in Copaifera pubiflora, Copaifera trapezifolia, and Copaifera langsdorffii oleoresins
Creators: name: Carneiro, Luiza J.
name: Bastos, Jairo K.
name: Veneziani, Rodrigo C. S.
name: Santos, Mario F. C.
name: Ambrósio, Sérgio R.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Space Science
subject: Medicine
subject: Pharmacology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Plant Biology
subject: FOS: Biological sciences

description: TheCopaifera oleoresins are widely used in folk medicine to treat various diseases. The goal of this study was to develop a validated reverse-phase high-performance liquid chromatography method with photodiode array detection (RP-HPLC-PDA) to quantify eight terpenes: ent-hardwickiic acid, ent-copalic acid, ent-7α-acetoxy hardwickiic acid, ent-16-hydroxy-3,13-clerodadiene-15,18-dioic acid, ent-5,13-labdadiene-15-oic acid, junenol, ent-kaurenoic acid, and 13E-ent-labda-7,13-dien-15-oic acid in the oleoresins of Copaifera pubiflora L. (OCP), Copaifera trapezifolia L. (OCT) and Copaifera langsdorffii L. (OCL). The linearity of the method was confirmed in the range of 20.00–500 µg.mL−1 (r2 > 0.999). The limit of quantification was between 1,05 and 16.89 µg.mL−1. Precision and accuracy ranges were found to be %RSD <0.2 and 96% to 110%, respectively. Based on the obtained results, the developed analytical method is rapid, precise, accurate, and sensitive for quantifying these terpenes in Copaifera's oleoresins.
What''s New in Digital Pre-Distortion?  Slides
Creators: John Wood
Publisher: name: IEEE
Year: 2016

MTT Webinar Slides
In cellular wireless communications systems, the RF power amplifier (PA) in the transmitter must be as efficient as possible, to minimize energy costs, to prolong battery life, and to account for ‘green’ considerations. Modern spectrally-efficient, digitally-modulated signals such as LTE and UMTS present a challenge for efficient RF PA design, and the PA architectures that are adopted to achieve this goal are generally very nonlinear, and so some form of linearization technique is necessary. In this webinar we will highlight some of the challenges that are being faced in the field of linearization of PAs using digital pre-distortion (DPD). These challenges result from the demands of higher spectral efficiency digital communication signals, wider bandwidth and multi-protocol signals, higher frequency radio operation, more rapid convergence in adaptive DPD – so-called ‘real-time’ DPD, greater linearization accuracy, and the ability to accommodate memory effects. Some techniques will be offered for meeting these challenges, and ideas for new directions for DPD.
PyIT2FLS: A New Python Toolkit for Interval Type 2 Fuzzy Logic Systems
Creators: name: Haghrah, Amir Arslan
name: Ghaemi, Sehraneh
Publisher: name: arXiv
Year: 2019
Subjects: subject: Systems and Control (eess.SY)
subject: Mathematical Software (cs.MS)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Fuzzy logic is an accepted and well-developed approach for constructing verbal models. Fuzzy based methods are getting more popular, while the engineers deal with more daily life tasks. This paper presents a new Python toolkit for Interval Type 2 Fuzzy Logic Systems (IT2FLS). Developing software tools is an important issue for facilitating the practical use of theoretical results. There are limited tools for implementing IT2FLSs in Python. The developed PyIT2FLS is providing a set of tools for fast and easy modeling of fuzzy systems. This paper includes a brief description of how developed toolkit can be used. Also, three examples are given showing the usage of the developed toolkit for simulating IT2FLSs. First, a simple rule-based system is developed and it's codes are presented in the paper. The second example is the prediction of the Mackey-Glass chaotic time series using IT2FLS. In this example, the Particle Swarm Optimization (PSO) algorithm is used for determining system parameters while minimizing the mean square error. In the last example, an IT2FPID is designed and used for controlling a linear time-delay system. The code for the examples are available on toolkit's GitHub page: https://github.com/Haghrah/PyIT2FLS. The simulations and their results confirm the ability of the developed toolkit to be used in a wide range of the applications.
description: This work has been published in SoftwareX, Volume 30, May 2025, 102146. https://doi.org/10.1016/j.softx.2025.102146
Investigation of the oral, anal and hysterical character types and their relationship to percetions of child-rearing
Creators: name: Bowman, Roland Glen
Publisher: name: University of British Columbia
Year: 2011

description: Although psychoanalytic theory can provide a large number of testable hypotheses concerning personality development, scientific psychology has been slow to realize this potential. The concept of character type is one aspect of Freudian theory which merits further investigation. It is believed that certain traits occur together in adult personality because they arise at the same level of psychosexual development. The present study tested the empirical validity of the oral, anal and hysterical character constructs in a normal sample. Relationships between character type and perceptions of parental attitudes and behavior were also explored. 143 psychology students completed a personality questionnaire, which provided scores for traits relevant to the character typology, and the Parental Role Patterns questionnaire (PRP), a measure of adult's perceptions of their own childrearing. Subjects also provided information about birth order, number of siblings, parents' marital status and other demographic variables thought to be relevant to the personality types. It was hypothesized that those traits which have been attributed to the oral, anal and hysterical types would form correlation clusters. Factor analysis was used to test the nature of these intercorrelations. Several hypotheses concerning relationships between personality and childrearing were also advanced. These were tested by computing correlations between personality factor scores and PRP scores. For both male and female subjects, factors identifiable as the oral, anal and hysterical emerged, although the results did not support a view of the oral character as a unitary construct. The anal character emerged most clearly. These findings were discussed in relation to published studies in which the same personality questionnaire was used in a psychiatric population. The majority of the hypotheses pertaining to relationships between personality and childrearing also received support. The oral character was associated with perceptions of low parental warmth and high control, the anal character with high warmth (for females), and the hysterical character with low warmth. A multivariate analysis of variance performed on groups of subjects typical of one of the three character types failed to indicate significant differences in childrearing perceptions. Since an adequate typology should enable researchers to make predictions on the basis of subject assignment to type, the usefulness of the psychoanalytic character typology remains in question.
Fault-tolerant Real-Time Perception for Self-Driving Vehicles
Creators: name: Baek, Iljoo
Publisher: name: Carnegie Mellon University
Year: 2022
Subjects: Applied Computer Science

description: Emerging automated vehicle (AV) systems are increasingly deploying various types of perception applications to satisfythe requirements of safety and convenience. Platform cost and power consumption concerns also drive automotivesystem designers to engineer better autonomous systems that share minimum system resources. These new trends lead to many challenges for designing resource sharing and scheduling that provide predictable performance for multipleheterogeneous applications. In short, perception, resource management and fault-tolerance support have to run concurrently and work together well. Many prior studies have focused on very specific layers, perception alone, or only fault-tolerant needs ignoring the rest of the system. This thesis studies each of these three inter-related subsystems and proposes frameworks to ensure that perception tasks work well together in coordinated, real-time and fault-tolerantfashion. We analyze the perception needs for AVs and provide practical insight into the real-time resource usage patterns of several software platforms for various applications on an autonomous vehicle. We also introduce detailed methodologies to analyze the computational workloads of the heterogeneous perception tasks. To meet the real-time requirements of AVs, hardware platforms typically include a variety of computing resources ranging from multi-core processors to hardware accelerators such as Graphics-Processing Units (GPUs). We, therefore, introduce novel analytical and systems techniques for running multiple heterogeneous perception applications together. Specifically, we focus on the issues of memory contention, synchronization, and access control for hardware accelerators. In conjunction with analyzable real-time scheduling techniques, we also study the different failure modes of these high-performance computing platforms and develop software strategies to ensure fault-tolerant operations. Our solutions are readily applicableto commodity hardware not only for migrating existing perception applications to single GPU-based embeddedplatforms but also for developing new software and hardware perception systems for AVs.
Synthetic Aperture Radar (SAR) Technology and Applications: Serving the Humanitarian Needs Slides
Creators: Robert Caverly
Publisher: name: IEEE
Year: 2016

MTT Webinar Slides
Magnetic Resonance Imaging (MRI) scanners are an important diagnostic tool for the medical practitioner. MRI provides a non-invasive means of obtaining high contrast images of soft tissues and to obtain real-time images of the cardiovascular system and other dynamic changes in the human body. MRI scanners rely heavily on a number of topical areas of interest to Electrical Engineers: image processing, high speed computing and RF (radio frequency) systems and components. This presentation will focus on some of the RF aspects of the MR process and MR scanners. A primer on the physical phenomenon behind magnetic resonance will start the presentation and include a discussion of the origin of the MR signal. The need for the high static magnetic field (B0), the use of gradient coils for MR signal spatial encoding, simple RF pulse sequences and how they are used in image construction will be covered. This MR image construction process and the control of the various steps that manipulate the atomic nuclei to generate the final MR diagnostic image put demanding constraints on RF equipment capabilities and these will be discussed, along with a high-level overview of the various components making up conventional MRI systems. This high-level overview will include a look at various examples of transmit and receive RF systems and examples of transmit and receive coils that make up MR scanners and system diagrams for both the RF transmit and receive paths. The talk will then narrow in scope to look at how these RF coils are modeled and controlled in both transmit and receive states and how these components are used for transmit/receive switching and patient and equipment protection.
Cocycle and orbit superrigidity for lattices in SL(n,R) acting on homogeneous spaces
Creators: name: Popa, Sorin
name: Vaes, Stefaan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Operator Algebras (math.OA)
subject: Dynamical Systems (math.DS)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We prove cocycle and orbit equivalence superrigidity for lattices in SL(n,R) acting linearly on R^n, as well as acting projectively on certain flag manifolds, including the real projective space. The proof combines operator algebraic techniques with the property (T) in the sense of Zimmer for the action of SL(n,Z) on R^n, n \geq 4. We also show that the restriction of the associated orbit equivalence relation to a subset of finite Lebesgue measure, provides a II_1 equivalence relation with property (T) and yet fundamental group equal to R_+.
Lyapunov exponent for the laser speckle potential: a weak disorder expansion
Creators: name: Gurevich, E.
name: Kenneth, O.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Anderson localization of matter waves was recently observed with cold atoms in a weak 1D disorder realized with laser speckle potential [J. Billy et al., Nature 453, 891 (2008)]. The latter is special in that it does not have spatial frequency components above certain cutoff $q_{c}$. As a result, the Lyapunov exponent (LE), or inverse localization length, vanishes in Born approximation for particle wavevector $k>{1/2}q_{c}$, and higher orders become essential. These terms, up to the order four, are calculated analytically and compared with numerical simulations. For very weak disorder, LE exhibits a sharp drop at $k$ $={1/2}q_{c}$. For moderate disorder (a) the drop is less dramatic than expected from the fourth order approximation and (b) LE becomes very sensitive to the sign of the disorder skewness (which can be controlled in cold atom experiments). Both observations are related to the strongly non-Gaussian character of the speckle intensity.
description: 5 pages, 2 figures
Chiral charge-density-waves
Creators: name: Ishioka, J.
name: Liu, Y. H.
name: Shimatake, K.
name: Kurosawa, T.
name: Ichimura, K.
name: Toda, Y.
name: Oda, M.
name: Tanda, S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We discovered the chirality of charge density waves (CDW) in 1T-TiSe$_2$ by using scanning tunnelling microscopy (STM) and optical ellipsometry. We found that the CDW intensity becomes $I{a_1}:I{a_2}:I{a_3} = 1:0.7 \pm 0.1:0.5 \pm 0.1$, where $Ia_i$ (i =1, 2, 3) is the amplitude of the tunnelling current contributed by the CDWs. There were two states, in which the three intensity peaks of the CDW decrease \textit{clockwise} and \textit{anticlockwise} when we index each nesting vector in order of intensity in the Fourier transformation of the STM images. The chirality in CDW results in the three-fold symmetry breaking. Macroscopically, two-fold symmetry was indeed observed in optical measurement. We propose the new generalized CDW chirality $H_{CDW} \equiv {\boldmath $q_1$} \cdot ({\boldmath $q_2$}\times {\boldmath $q_3$})$, where ${\boldmath $q_i$}$ are the nesting vectors, which is independent of the symmetry of components. The nonzero $H_{CDW}$ - the triple-${\boldmath $q$}$ vectors do not exist in an identical plane in the reciprocal space - should induce a real-space chirality in CDW system.
description: 12 pages, 4 figures
Introduction to (THz) Technology and Applications Part 1 Slides
Creators: Peter Siegel
Publisher: name: IEEE
Year: 2016

MTT Webinar Slides
At the same time, the satellite industry has recently experienced the maturation of disruptive technology and manufacturing processes to build and launch U-Class satellites. What are commonly called CubeSats feature rapid development cycles and low-cost launches as secondary payloads on missions of opportunity. Such small satellites provide more than sufficient resources to accommodate millimeter-wave sensors capable of observing precipitation on a global basis. A closely-spaced constellation of such remote sensors of precipitation can observe cloud processes leading to precipitation with revisit times on the order of 5 minutes. An on-orbit technology demonstration for such a mission known as the Temporal Experiment for Storms and Tropical Systems (TEMPEST) is in progress and expected to be ready for launch within one year.
Right Unitarity Triangles, Stable CP-violating Phases and Approximate Quark-Lepton Complementarity
Creators: name: Xing, Zhi-zhong
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Current experimental data indicate that two unitarity triangles of the CKM quark flavor mixing matrix V are almost the right triangles with α\approx 90^\circ. We find that α= 90^\circ actually points to {\rm Re}(V_{tb}V_{ud}V^*_{td}V^*_{ub}) = 0. Considering a very suggestive parametrization of V, we show that its CP-violating phase ϕis nearly equal to α(i.e., ϕ- α\approx 1.1^\circ). Both ϕand αare stable against the renormalizaton-group evolution from the electroweak scale M_Z to a superhigh energy scale M_X or vice versa, and thus it is impossible to obtain α= 90^\circ at M_Z from ϕ= 90^\circ at M_X. We conjecture that there might also exist a maximal CP-violating phase ϕ\approx 90^\circ in the MNS lepton flavor mixing matrix U. The approximate quark-lepton complementarity relations, which hold in the standard parametrizations of V and U, can also hold in our particular parametrizations of V and U simply due to the smallness of |V_{ub}| and |V_{e3}|.
description: RevTex 12 pages, 1 PS figure. Accepted for publication in PLB
Approximating the Gaussian Multiple Description Rate Region Under Symmetric Distortion Constraints
Creators: name: Tian, Chao
name: Mohajer, Soheil
name: Diggavi, Suhas N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider multiple description coding for the Gaussian source with K descriptions under the symmetric mean squared error distortion constraints, and provide an approximate characterization of the rate region. We show that the rate region can be sandwiched between two polytopes, between which the gap can be upper bounded by constants dependent on the number of descriptions, but independent of the exact distortion constraints. Underlying this result is an exact characterization of the lossless multi-level diversity source coding problem: a lossless counterpart of the MD problem. This connection provides a polytopic template for the inner and outer bounds to the rate region. In order to establish the outer bound, we generalize Ozarow's technique to introduce a strategic expansion of the original probability space by more than one random variables. For the symmetric rate case with any number of descriptions, we show that the gap between the upper bound and the lower bound for the individual description rate is no larger than 0.92 bit. The results developed in this work also suggest the "separation" approach of combining successive refinement quantization and lossless multi-level diversity coding is a competitive one, since it is only a constant away from the optimum. The results are further extended to general sources under the mean squared error distortion measure, where a similar but looser bound on the gap holds.
description: 46 pages, 5 figures, submitted to IEEE Trans. on Information Theory
Planar elliptic growth
Creators: name: Khavinson, Dmitry
name: Mineev-Weinstein, Mark
name: Putinar, Mihai
Publisher: name: arXiv
Year: 2009
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: The planar elliptic extension of the Laplacian growth is, after a proper parametrization, given in a form of a solution to the equation for area-preserving diffeomorphisms. The infinite set of conservation laws associated with such elliptic growth is interpreted in terms of potential theory, and the relations between two major forms of the elliptic growth are analyzed. The constants of integration for closed form solutions are identified as the singularities of the Schwarz function, which are located both inside and outside the moving contour. Well-posedness of the recovery of the elliptic operator governing the process from the continuum of interfaces parametrized by time is addressed and two examples of exact solutions of elliptic growth are presented.
description: 27 pages
Surface and bulk polaritons in a linear magnetoelectric multiferroic with canted spins: Transverse Electric polarisation
Creators: name: Gunawan, V.
name: Stamps, R. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Some magnetoelectric multiferroics have a canted spin structure that can be described by a Dzyaloshinkii-Moriya coupling. We calculate properties and features expected for surface and bulk magnon polaritons in such media with a linear magnetoelectric interaction for the case of transverse electric polarisation. The dielectric polarisation and magnetisation of weak ferromagnetism are constrained to lie in the plane parallel to the surface. We examine a geometry with the polarisation oriented in the film plane and present numerical results for the transverse electric polarisation. Particular attention is given to non-reciprocal surface modes, which exist in frequency between two bulk bands, and show how these modes can be modified by external magnetic field. Results for attenuated total reflection are presented, and discussed in relation to nonreciprocity. Example results are calculated for the canted antiferromagnet BaMnF4.
description: 14 pages, 6 figures
Griffin and Hero-Deer in cosmological composition, as practical model of social development of ancient societies, on example of Pazyryk carpet (v century BC)
Creators: name: Polyakova O., O.
Publisher: name: Archaeoastronomy and Ancient Technologies
Year: 2013
Subjects: GRIFFINS
HEROES
HERBIVORES
ANTLERS
PRECESSION
THE ECLIPTIC POLE
CELESTIAL POLE

description: The Eurasian tradition in general and, in particular, in the Scythian outlook, reveal two astral tradition of constructing social relations, by analogy with the observed picture of the sky, which is reflected in the monuments of visual culture. On the example of the Pazyryk carpet V century BC You can make some assumptions about the semantic meaning of each of the traditions. Figure of a man deer on the carpet has icons " cross in a circle ", which denotes the astral symbolism land or Pole of the World, which revolves around the starry sky. In support of this idea seeing that image herbivorous ungulates and other monuments of the Scythian culture shows their central or solitary position compared with a pair of griffins like Griffins revolve around the center. It can be assumed that the tradition and image herbivorous hoofed symbolized divine light solar power, and other images of predatory Gryphon tradition symbolized the real strength of the earth in their binary code change of light and darkness, life and death, good and evil as displayed in the minds of rotating constellation rising or setting on the horizon. This could form the basis of religious beliefs and festivities accompanying social structure of ancient societies.
Holographic superconductivity in M-Theory
Creators: name: Gauntlett, Jerome P.
name: Sonner, Julian
name: Wiseman, Toby
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using seven-dimensional Sasaki-Einstein spaces we construct solutions of D=11 supergravity that are holographically dual to superconductors in three spacetime dimensions. Our numerical results indicate a new zero temperature solution dual to a quantum critical point.
description: 4 pages, 3 figures; v2 - added to discussion of low temperature limit, two figures combined, references added ; v3 - minor corrections, published version
Maria Reiche’s line to archaeoastronomy
Creators: name: Sparavigna A., C.
Publisher: name: Archaeoastronomy and Ancient Technologies
Year: 2013
Subjects: PERU
NAZCA LINES
GEOGLYPHS
ASTRONOMICAL ORIENTATION
SOLAR ORIENTATION
PRECESSION
PLANETARIUM SOFTWARE

description: Maria Reiche was a German mathematician and archaeologist that, from 1940, devoted her life to the study of the Nazca Lines, the most famous Peruvian geoglyphs, gaining recognition and preservation of them. Created by removing the upper most layer of the arid soil of the Nazca desert, these geoglyphs, declared in 1995 a UNESCO World Heritage Site, are composed by very long straight and trapezoidal lines, spirals and large figures representing animals. Maria Reiche, in fact an archaeoastronomer too, proposed for the Lines some interesting astronomical interpretations, telling that some of them were created to point to the rising and setting of some stars. We can appraise her approach to this interpretation of the Lines by using satellite imagery and a free planetarium software. A discussion of some geoglyphs is also proposed, showing their astronomical orientations.
Design of GaN Power Amplifiers: Part 1 Slides
Creators: Edward Niehenke
Publisher: name: IEEE
Year: 2018

MTT Webinar Slides
This webinar introduces attendees to the GaN-transistor, its properties, various structures including the latest GaN power amplifier (PA) design techniques. The properties of GaN will be presented showing the advantage of these devices over GaAs and Si. GaN HEMT transistors will be shown delineating the various geometries, semiconductor processes and structures with associated performance. Guidelines for reliable operation are presented considering device junction temperature including thermal management techniques. The nonlinear models of GaN HEMT devices necessary for the CAD of power amplifiers (PA’s) is presented. Design considerations for both constant amplitude envelope signals as well as the non-constant amplitude envelope signals are presented. Step-by-step design procedures are shown for various GaN PA examples including different classes of operation as well as the popular Doherty PA.
Russian meteorite of the Bronze Age (rock record)
Creators: name: Vodolazhskaya L., N.
name: Nevsky M. Yu
Publisher: name: Archaeoastronomy and Ancient Technologies
Year: 2013
Subjects: АРХЕОАСТРОНОМИЯ
ПЕТРОГЛИФЫ
НАСКАЛЬНОЕ ИСКУССТВО
МЕТЕОРИТ
МЕТЕОРИТНЫЙ ДОЖДЬ
КРАТЕР
КЛИНОПИСНАЯ ТАБЛИЧКА YBC 7289
ARCHAEOASTRONOMY
PETROGLYPHS
ROCK ART
METEOROID
METEORITE SHOWER
IMPACT CRATER
BABYLONIAN CLAY TABLET YBC 7289

description: This paper presents the results of the study of petroglyphs found in the quartzite grotto near the Skelnovsky small village in the Northern Black Sea in the South of Russia. The aim of the study was the analysis and interpretation of the Early Bronze Age petroglyphs using archaeoastronomical methods. The article presents a comparative analysis of Skelnovsky grotto ancient images and contemporary eyewitness accounts of the Sikhote-Alin meteorite fall and meteorite shower. Some petroglyphs were interpreted by us using ethnographic and folklore material. In this study, the magnetic declination for the geographical coordinates Skelnovsky farm was calculated, and the projection of the whole picture Skelnovskih petroglyphs on the topographical map of the area was built. The proposed location of the meteorite fall was determined with this projection. It is confirmed by satellite pictures, on which are the distinguishable terrain features, typical for the meteorite fall, are visible including the possible impact crater, and the corresponding symbols on a topographical map. The studies in the article conclude the astronomical character of the main content of the Skelnovsky petroglyphs picture which depicts the fall of a large meteoroid (bolide), similar to the Sikhote-Alin meteorite, accompanied by a meteorite shower. After a comparative analysis of the images in Sklenovsky grotto it was discovered that the petroglyph is a copy of the figure depicted on the famous Mesopotamic clay tablet YBC 7289. We speculate that this figure is a prototype of an important building used either for ritual or farm purposes, typical for the Bronze Age and distributed as in Mesopotamia, as also on the coast of the Northern Black Sea. This may indicate a cultural continuity, including the field of protoscientific knowledge, between the inhabitants of the Northern Black Sea and the inhabitants of Mesopotamia during the Bronze Age.
Mode Stability of Hermitian Instantons
Creators: name: Andersson, Lars
name: Araneda, Bernardo
name: Dahl, Mattias
Publisher: name: arXiv
Year: 2024
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this note, we prove the Riemannian analog of black hole mode stability for Hermitian, non-self-dual gravitational instantons which are either asymptotically locally flat (ALF) and Ricci-flat, or compact and Einstein with positive cosmological constant. We show that the Teukolsky equation on any such manifold is a positive definite operator. We also discuss the compatibility of the results with the existence of negative modes associated to variational instabilities.
Two new mohangic acid derivatives from the deep-sea bacteria Alcanivorax dieselolei BC-5
Creators: name: Zhao, Hao-Wen
name: Yi, Yan
name: Li, Jia-Qi
name: Wang, Jin-Hui
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Astronomical and Space Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Infectious Diseases
subject: FOS: Health sciences

description: Mohangic acids are a class of p-aminoacetophenonic acids that contain a conjugated triene or diene moiety. Herein, this paper reports two new mohangic acids E and F (1-2) together with a known compound mohangic acid A (3), which were isolated from the deep-sea sediment-derived bacteria Alcanivorax dieselolei BC-5. The structures of 1 and 2 were established by HRESIMS, 1 D and 2 D NMR, and IR spectroscopy.