cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Progressive Band Processing for Hyperspectral Imaging
Creators: name: Schultz, Robert C.
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: Hyperspectral
Progressive Band Processing (PBP)

description: Hyperspectral imaging has emerged as an image processing technique in many applications.  The reason that hyperspectral data is called hyperspectral is mainly because the massive amount of information provided by the hundreds of spectral bands that can be used for data analysis.  However, due to very high band-to-band correlation much information may be also redundant.  Consequently, how to effectively and best utilize such rich spectral information becomes very challenging.  One general approach is data dimensionality reduction which can be performed by data compression techniques, such as data transforms, and data reduction techniques, such as band selection.  This dissertation presents a new area in hyperspectral imaging, to be called progressive hyperspectral imaging, which has not been explored in the past.  Specifically, it derives a new theory, called Progressive Band Processing (PBP) of hyperspectral data that can significantly reduce computing time and can also be realized in real-time.  It is particularly suited for application areas such as hyperspectral data communications and transmission where data can be communicated and transmitted progressively through spectral or satellite channels with limited data storage.  Most importantly, PBP allows users to screen preliminary results before deciding to continue with processing the complete data set.  These advantages benefit users of hyperspectral data by reducing processing time and increasing the timeliness of crucial decisions made based on the data such as identifying key intelligence information when a required response time is short.
Supplemental materials
Creators: name: Martin, Bernardi
Publisher: name: Zenodo
Year: 2021

description: Figure S1 Exaggeration of IL-6 The box plots show the perioperative levels of IL-6 at different time points. In the box plots, the lower boundary of the box indicates the 25th percentile, a black line within the box marks the median, and the upper boundary of the box indicates the 75th percentile. Whiskers above and below the box indicate the 10th and 90th percentiles. Points above and below the whiskers indicate outliers outside the 10th and 90th percentiles. Abbreviations: CPB, cardiopulmonary bypass; POD, postoperative day; sgp130, soluble glycoprotein 130; sIL-6R, soluble interleukin-6 receptor. Figure S2 Exaggeration of IL-6, sIL-6R and sgp130 The box plots show the perioperative levels of IL-6, sIL-6R and sgp130 at different time points. Red, blue and green boxes indicate IL-6, sIL-6R and sgp130 levels, respectively. In the box plots, the lower boundary of the box indicates the 25th percentile, a black line within the box marks the median, and the upper boundary of the box indicates the 75thpercentile. Whiskers above and below the box indicate the 10th and 90th percentiles. Points above and below the whiskers indicate outliers outside the 10th and 90th percentiles. Outliers of IL-6 above 1000 pg ml-1 are not shown. Abbreviations: CPB, cardiopulmonary bypass; POD, postoperative day; sgp130, soluble glycoprotein 130; sIL-6R, soluble interleukin-6 receptor. Table S1 Characteristics in patients with high vs. low sIL−6R/IL−6 ratio
The Multiple-component Binary Hyad, vA 351
Creators: name: G. Fritz Benedict
name: Franz, Otto
name: Horch, Elliot
name: Torres, Guillermo
name: L. Prato
Publisher: name: Zenodo
Year: 2021

description: We extend results first announced by Franz et al. (1998), that identified vA351 = H346 in the Hyades as a multiple star system containing a white dwarf. With Hubble Space Telescope Fine Guidance Sensor fringe tracking and scanning, and more recent speckle observations, all spanning 20.7 years, we establish a parallax, relative orbit, and mass fraction for two components, with a period, P = 2.70y and total mass 2.1M⊙. With ground-based radial velocities, we find that component B consists of BC, two M dwarf stars orbiting with a very short period (PBC = 0.749 days), having a mass ratio MC/MB=0.95. We confirm that the total mass of the system can only be reconciled with the distance and component photometry by including a fainter, higher mass component. The quadruple system consists of three M dwarfs (A,B,C) and one white dwarf (D); MA=0.57M⊙, MB=0.48M⊙, and MC=0.45M⊙. The WD mass, 0.53M⊙, comes from cooling models, an assumed Hyades age of 670My, and consistency with all previous and derived astrometric, photometric, and RV results. Velocities from Hα and He I emission lines confirm the BC period derived from absorption lines, with similar (HeI) and higher (Hα) velocity amplitudes. We ascribe the larger Hα amplitude to emission from a region each component shadows from the other, depending on the line of sight.
description: Paper submitted to Astronomical Journal
Metamorphic Malware Classification
Creators: name: Ramakrishnan, Rukmini
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: Boosting
Decision trees
Latent Dirichlet Allocation
Metamorphic Malware
Surrogate data testing
Topic modelling

description: Metamorphic malware tend to change its code structure, every time it infects a new host machine. This makes classification and subsequent detection of the malware very difficult. Unlike other viruses, metamorphic malware uses code obfuscation techniques on the body of the malware and that way the malware structure does not exhibit a common signature. With the advent of advanced malware construction kits, it is easy to generate numerous metamorphic variations of the same malware. In spite of meticulously changing the code structure for every infection, the core functionality of the malware remains unchanged. We present methods to classify and detect metamorphic malware by doing a static analysis of the opcode sequences in the malware specimens. The opcodes (words) from the assembly files of specimens are analyzed to construct word distributions and learn topic distributions, using Latent Dirichlet Allocation (LDA), for each malware specimen.  Using the topic and word distributions as features, we build classifiers to predict the family of each specimen using the RUSBoost and multi-class AdaBoost algorithms. We experimentally evaluate our methods using a real dataset of 400 malware specimens from four families and 25 benign specimens.  We find that classification into malware families using the word distribution features is more accurate and robust than the classification using the LDA-learned topic distribution features.  We also find that the classification accuracy is stable under simple substitutions of opcodes with short equivalent opcode sequences.  Topic distribution features provide comparable classification performance upon significantly increasing the computational cost (number of iterations) of LDA.  Moreover, using a surrogate data testing approach we find that the association between word/topic distributions and malware families is significant.
Learning Hierarchical Workflows Using Community Detection
Creators: name: Peshave, Akshay
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: clickstream mining
community detection
hierarchical workflows
modularity optimization
recommendation systems
workflow mining

description: Workflows identified from user event logs and click-stream data are useful as knowledge bases for behavioral analysis and recommendation systems. In this study we identify abstractions or summaries of event logs modeled as user activity flow networks. The abstractions are identified based on structural properties as well as user activity flow dynamics over the network using community detection methods. We apply a fast modularity optimization and multi-level resolution approach to detect hierarchical community structure in user activity flow networks. The detected communities are compared to those detected by the information-theoretic map equation minimization approach to weigh pros and cons of the fast modularity optimization approach in the workflows context. We further attempt to identify the most probable sources and sinks of user activity in individual communities and trim the network accordingly to reduce entropy of the workflow abstractions.
Prevention and Detection of SQL Injection Attacks at the Database layer
Creators: name: Singh, Payal
Publisher: name: Maryland Shared Open Access Repository
Year: 2014

description: A lot of research has gone into eliminating SQL Injection attacks over the past decade and yet it is one of the most prevalent web based attacked harming commerce as well as privacy today. This is a clear indicator that we need to look deeper than just the network and application layer to consolidate security recommendations and practices into the core of any application - its data layer. The aim of this thesis is to demonstrate as well as theorize features that can be ap- plied to the DBMS layer of web applications so that the lowermost layer responsible for managing and maintaining data is in itself capable enough to withstand unauthorized and malicious accesses and modifications of the data it protects. While a lot has been done to prevent code injection on the network layer and applica- tion (front-end) layer, the DBMS layer is seldom looked at as another layer to implement injection detection and prevention practices. In this paper, we look into (a) How we can implement current DBMS features to build additional security layers against SQL injection; and (b) Suggest additional features that can be used to further strengthen the DMBS security layer against injection attacks.
Implementation of the Boolean Factoring Algorithm
Creators: name: Bagde, Sumeetkumar
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: algorithm
generic arithmetic
implementation
integer factorization
satisfiability

description: The Boolean Factoring Algorithm was introduced by Lomonaco in 2013. This is an algorithm for reduction of the integer factorization problem to DNF-SAT. While DNF-SAT is in P, the reduction itself takes exponential time. This thesis expands on the variant called Multiplicative Boolean Factoring proposed in the same paper. Various optimizations are introduced and proofs for some of the results are presented. A rigorous running time analysis of the algorithms is provided. An implementation of the two algorithms was carried out in the Java programming language. Our thesis details this implementation and experimental running time analysis performed using the same. The largest number factored by our implementation so far is the 50-bit integer 1,090,093,705,635,337 in 37.67 seconds. The possibility of a sub-exponential time reduction to DNF-SAT and an extension to the discrete logarithm problem are posited as avenues for future work.
On Developing a System Analysis Model for Trace Gas Detection using Pulsed Laser and QEPAS
Creators: name: Sardesai, Neha Ravindra
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: Gas Detection
QEPAS
System Analysis Model

description: This thesis presents the development of a system analysis model for a QEPAS (Quartz Enhanced Photo Acoustic Spectroscopy)-based trace gas detection system with pulsed-laser input and sample-mean test-statistic output. For this QEPAS-based system, the input laser signal is pulsed, and its beam is centered between the tines of a quartz tuning fork placed in a gas cell. If the trace gas is present, it absorbs the energy from the beam, resulting in the generation of an acoustic pressure wave P(r, t). This pressure wave strikes the fork tines causing them to vibrate at resonant frequency. These vibrations result in the flow of current within the tines, due to the piezoelectric effect. On obtaining the current flow signal waveform in the fork, and using statistical signal processing of multiple samples of this waveform, the trace gas can be detected and its concentration estimated. This analysis model will allow one to assess the performance of such a system for various parameter values that define a given system. The project involves the generation and assessment of solutions of differential equations for the pulsed-laser generated acoustic pressure wave, the resulting tuning-fork tines vibration, and the tuning fork generated current.  This work is a different, but related, approach to that of N. Petra, et al., that considered a QEPAS-based system with a continuous-wave wavelength-sinusoidal-modulated laser signal [1].
On Detection of Radio Frequency Interference in Spaceborne Microwave Radiometers using Negentropy Approximations and Complex Signal Kurtosis
Creators: name: Bradley, Damon C.
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: Digital
Kurtosis
Negentropy
Processing
Radiometer
Signal

description: Microwave radiometers are passive, sensitive radio receivers used as spacecraft instruments for Earth remote sensing. Microwave radiometers work by measuring average power of naturally occurring thermal emission from Earth. Radiometer data are used by researchers to monitor Earth's hydrosphere and a number of important geophysical processes critical to our understanding of and survival on the planet. Besides measuring natural thermal noise, radiometers also measure inadvertent signal emissions from human-made sources, such as surveillance radar, communications systems, reflected signals from broadcast satellites, and signals from a wide array of wireless technologies. Signals of this nature are called radio-frequency interference (RFI) and corrupt radiometric measurements, leading to erroneous geophysical retrievals. RFI threatens the utility of radiometer data as a result of this corruption. This research investigates two new approaches for detecting RFI. The first approach investigates the suitability of several different negentropy approximations as test-statistics for detecting RFI in the radiometric signal. The second approach combines polarimetric and baseband quadrature signals into a complex signal model and employs a complex signal kurtosis test-statistic to improve RFI detection relative, to the current state of the art that uses only real-valued signal kurtosis. It is shown that various negentropy approximations do not outperform detection performance of the real-valued kurtosis, but does provide insight as to why kurtosis works well. It is also shown that RFI detection in the complex domain using the complex signal kurtosis offers improved detection performance and less data rate, leading to new digital signal processing systems for future spaceborne microwave radiometers.
Multiple Objective Task Scheduling for Scalable High Performance Computing
Creators: name: Simon, Tyler
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: Graph Algorithms
High Performance Computing
Runtime Systems
Scheduling

description: Individual processor frequencies have reached an upper physical and practical limit. Processor designs now involve adding multiple processing elements to a single chip to enable increased performance. It is expected that all future processor designs will have multiple cores with a focus on reducing frequencies and adding more individual processing elements (cores) while having to balance power consumption, reliability and maintain high performance.  Due to the increased complexity as well as increased heterogeneity of parallel architectures, petascale and future exascale systems, with the number of processors on the order of 108-109, must incorporate more intelligent software tools that help manage parallel execution for the user. I show that by managing the parallel execution environment at runtime, we can measure performance tradeoffs for a particular application or application domain for a set of common HPC architectures.  In this dissertation I provide a performance analysis of two common graph algorithms for finding a minimum spanning tree and evaluate the multicore performance of a common high performance computing (HPC) benchmark on multicore processors.   I developed a novel autonomic execution model and adaptive runtime system (ARRIA) Adaptive Runtime Resource for Intensive Applications. ARRIA is designed with the intent of improving application programmability, scalability and performance while freeing the programmer from explicit message passing and thread management. Experiments are conducted that evaluate ARRIA's capabilities on data intensive applications, those where the majority of execution time is spent reading and writing either to local or remote memory locations. In my approach, I focus on developing task schedules that satisfy multiple objectives for clusters of compute nodes during runtime. This approach is novel in that it can control application performance and satisfy constraints which are solved using multi objective optimization techniques as the program runs. The development and implementation of the ARRIA runtime system and subsequent optimization criteria likely provide reasonable models for the exascale computing era.   The results of this dissertation demonstrate, experimentally, that for high performance computing systems, a dynamic, task based, parallel programming environment and scheduler that provide lower total workload runtimes than state of the art static schedules.
Mobility in wireless sensor networks : advantages, limitations and effects
Creators: name: Jerew, Oday Dakhil Hassan
Publisher: name: The Australian National University
Year: 2018
Subjects: subject: TK7872.D48 J47 2011
subject: Wireless sensor networks

description: The primary aim of this thesis is to study the benefits and limitations of using a mobile base station for data gathering in wireless sensor networks. The case of a single mobile base station and mobile relays are considered. A cluster-based algorithm to determine the trajectory of a mobile base station for data gathering within a specified delay time is presented. The proposed algorithm aims for an equal number of sensors in each cluster in order to achieve load balance among the cluster heads. It is shown that there is a tradeoff between data-gathering delay and balancing energy consumption among sensor nodes. An analytical solution to the problem is provided in terms of the speed of the mobile base station. Simulation is performed to evaluate the performance of the proposed algorithm against the static case and to evaluate the distribution of energy consumption among the cluster heads. It is demonstrated that the use of clustering with a mobile base station can improve the network lifetime and that the proposed algorithm balances energy consumption among cluster heads. The effect of the base station velocity on the number of packet losses is studied and highlights the limitation of using a mobile base station for a large-scale network. We consider a scenario where a number of mobile relays roam through the sensing field and have limited energy resources that cannot reach each other directly. A routing scheme based on the multipath protocol is proposed, and explores how the number of paths and spread of neighbour nodes used by the mobile relays to communicate affects the network overhead. We introduce the idea of allowing the source mobile relay to cache multiple routes to the destination through its neighbour nodes in order to provide redundant paths to destination. An analytical model of network overhead is developed and verified by simulation. It is shown that the desirable number of routes is dependent on the velocity of the mobile relays. In most cases the network overhead is minimized when the source mobile relay caches six paths via appropriately distributed neighbours at the destination. A new technique for estimating routing-path hop count is also proposed. An analytical model is provided to estimate the hop count between source-destination pairs in a wireless network with an arbitrary node degree when the network nodes are uniformly distributed in the sensing field. The proposed model is a significant improvement over existing models, which do not correctly address the low-node density situation.
Topological slow light via coupling chiral edge modes with flat bands
Creators: name: Yu, Letian
name: Xue, Haoran
name: Zhang, Baile
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Chiral edge modes in photonic topological insulators host great potential to realize slow-light waveguides with topological protection. Increasing the winding of the chiral edge mode around the Brillouin zone can lead to broadband topological slow light with ultra-low group velocity. However, this effect usually requires careful modifications on a relatively large area around the lattice edge. Here we present a simple and general scheme to achieve broadband topological slow light through coupling the chiral edge modes with flat bands. In this approach, modifications inside the topological lattice are not required. Instead, only several additional resonators that support the flat bands need to be attached at the lattice edge. We demonstrate our idea numerically using a gyromagnetic photonic crystal, which is ready to be tested at microwave frequencies.
description: 6 pages, 5 figures
Making Things Economic: Theory and Government in New South Wales, 1788-1863
Creators: name: Huf, Benjamin
Publisher: name: Canberra, ACT : The Australian National University
Year: 2018
Subjects: History of colonial New South Wales
Nineteenth-century British imperialism
History of economic thought

description: This thesis is a study of the invention and consolidation of a domain of knowledge and government we today denominate as the ‘economic’ in the particular context of the British colonisation of New South Wales. Two lines of argument are pursued. The first recovers the idea of British imperialism in New South Wales as an ‘economic’ project, in which phenomena that have been typically assumed as essential to colonial development – convict work, land settlement, wool growing, migration and their impact on Aboriginal societies – came to be classified, organised and administered as distinctly economic problems. As imperial and colonial authorities increasingly appropriated the ‘constitutive metaphors’ of Ricardian political economy in their reports, inquiries and correspondence, they re-narrated these phenomena from discrete problems of state to integrated dynamics of production, distribution and wealth-accumulation. This economic project is studied in distinction from, even as it intersected with, the paradigms of democratisation, settler colonialism and legal-positivist statism with which historians have tended to frame the colony’s political and intellectual history in the first half of the nineteenth century. Its legacies, in the identities it forged and projects it legitimated, have been as enduring as the colonial constitution but less closely assessed. The second line of argument, arising from this reading of colonial history, revises the significance of nineteenth-century political economy as an emergent political vocabulary in a nascent Australian political culture, and in English-speaking Anglophone culture more generally. In appropriating political economy as an official discourse, imperial authorities not only helped insulate the ‘economic’ as a domain of knowledge, but consolidated a new, reductive framework for interpreting, governing and debating social interaction, regulated by the imperatives of supply and demand, profits and wages. Together, these two lines of argument are offered as a critical exercise in recovering and recognising the historical functioning of economic language in official, public and everyday speech. They provide a fresh perspective on aspects of the colonial past, and recover legacies which continue to shape our world today.
Multiplicity of solutions for a class of fractional $p(x,\cdot)$-Kirchhoff type problems without the Ambrosetti-Rabinowitz condition
Creators: name: Hamdani, M. K.
name: Zuo, J.
name: Chung, N. T.
name: Repovš, D. D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: Primary: 35R11, Secondary: 35J20, 35J60

description: We are interested in the existence of solutions for the following fractional $p(x,\cdot)$-Kirchhoff type problem $$ \left\{\begin{array}{ll} M \, \left(\displaystyle\int_{Ω\times Ω} \ \displaystyle{\frac{|u(x)-u(y)|^{p(x,y)}}{p(x,y) \ |x-y|^{N+p(x,y)s}}} \ dx \, dy\right)(-Δ)^{s}_{p(x,\cdot)}u = f(x,u), \quad x\in Ω, \\ \\ u= 0, \quad x\in \partialΩ, \end{array}\right.$$ where $Ω\subset\mathbb{R}^{N}$, $N\geq 2$ is a bounded smooth domain, $s\in(0,1),$ $p: \overlineΩ\times \overlineΩ \rightarrow (1, \infty)$, $(-Δ)^{s}_{p(x,\cdot)}$ denotes the $p(x,\cdot)$-fractional Laplace operator, $M: [0,\infty) \to [0, \infty),$ and $f: Ω\times \mathbb{R} \to \mathbb{R}$ are continuous functions. Using variational methods, especially the symmetric mountain pass theorem due to Bartolo-Benci-Fortunato (Nonlinear Anal. 7:9 (1983), 981-1012), we establish the existence of infinitely many solutions for this problem without assuming the Ambrosetti-Rabinowitz condition. Our main result in several directions extends previous ones which have recently appeared in the literature.
The Dualizing Spectrum, II
Creators: name: Klein, John R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Topology (math.AT)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 55P91; 57P10

description: To an inclusion topological groups H->G, we associate a naive G-spectrum. The special case when H=G gives the dualizing spectrum D_G introduced by the author in the first paper of this series. The main application will be to give a purely homotopy theoretic construction of Poincare embeddings in stable codimension.
description: Fixed an array of typos
Large N expansion of convergent matrix integrals, holomorphic anomalies, and background independence
Creators: name: Eynard, Bertrand
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose an asymptotic expansion formula for matrix integrals, including oscillatory terms (derivatives of theta-functions) to all orders. This formula is heuristically derived from the analogy between matrix integrals, and formal matrix models (combinatorics of discrete surfaces), after summing over filling fractions. The whole oscillatory series can also be resummed into a single theta function. We also remark that the coefficients of the theta derivatives, are the same as those which appear in holomorphic anomaly equations in string theory, i.e. they are related to degeneracies of Riemann surfaces. Moreover, the expansion presented here, happens to be independent of the choice of a background filling fraction.
description: 23 pages, Latex
Quantum Mechanics of Klein-Gordon Fields I: Hilbert Space, Localized States, and Chiral Symmetry
Creators: name: Mostafazadeh, A.
name: Zamani, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We derive an explicit manifestly covariant expression for the most general positive-definite and Lorentz-invariant inner product on the space of solutions of the Klein-Gordon equation. This expression involves a one-parameter family of conserved current densities J_a^μ, with a\in(-1,1), that are analogous to the chiral current density for spin half fields. The conservation of J_a^μis related to a global gauge symmetry of the Klein-Gordon fields whose gauge group is U(1) for rational a and the multiplicative group of positive real numbers for irrational a. We show that the associated gauge symmetry is responsible for the conservation of the total probability of the localization of the field in space. This provides a simple resolution of the paradoxical situation resulting from the fact that the probability current density for free scalar fields is neither covariant nor conserved. Furthermore, we discuss the implications of our approach for free real scalar fields offering a direct proof of the uniqueness of the relativistically invariant positive-definite inner product on the space of real Klein-Gordon fields. We also explore an extension of our results to scalar fields minimally coupled to an electromagnetic field.
description: 31 pages, part one of a series of two papers, to appear in Ann. of Phys. (NY)
Two-loop analysis of classically scale-invariant models with extended Higgs sectors
Creators: name: Braathen, Johannes
name: Kanemura, Shinya
name: Shimoda, Makoto
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present the first explicit calculation of leading two-loop corrections to the Higgs trilinear coupling $λ_{hhh}$ in models with classical scale invariance (CSI), using the effective-potential approximation. Furthermore, we also study -- for the first time at two loops -- the relation that appears between the masses of all states in CSI theories, due to the requirement of reproducing correctly the 125-GeV Higgs-boson mass. In addition to obtaining analytic results for general CSI models, we consider two particular examples of Beyond-the-Standard-Model theories with extended Higgs sectors, namely an $N$-scalar model (endowed with a global $O(N)$ symmetry) and a CSI version of the Two-Higgs-Doublet Model, and we perform detailed numerical studies of these scenarios. While at one loop the value of the Higgs trilinear coupling is identical in all CSI models, and deviates by approximately $82\%$ from the (one-loop) SM prediction, we find that the inclusion of two-loop corrections lifts this universality and allows distinguishing different BSM scenarios with CSI. Taking into account constraints from perturbative unitarity and the relation among masses, we find for both types of scenarios we consider that at two loops $λ_{hhh}$ deviates from its SM prediction by $100\pm10\%$ -- i.e. a quite significant further deviation with respect to the one-loop result of $\sim 82\%$.
description: 62 pages, 11 figures
Star-disk interactions in T Tauri star V2129 Oph: combining optical and infrared spectroscopy
Creators: name: Sousa, Alana
name: Bouvier, Jérôme
name: Alencar, Silvia
name: Donati, J.-F.
name: Alecian, E
Publisher: name: Zenodo
Year: 2021
Subjects: Young stars

description: In this work, we aim at understanding the dynamics of the magnetic star-disk interaction process in young stellar objects. We present the case of the young star, V2129 Oph, a well-known T Tauri star with spectral type K5, located in the rho Oph star formation region. We performed the time series analysis of this star using high-resolution spectroscopic data at optical wavelengths, from CFHT/ESPaDOnS and ESO/HARPS, and at infrared wavelengths, from CFHT/SPIRou. This dataset reveals a possible accretion variation over a time scale of a decade when compared to a previous observational campaign. We analyzed the variability of different circumstellar lines, such as Halpha and Hbeta, in the optical, and HeI (10830Å) and Pabeta, in the infrared. We measured the periodicity and the correlation matrices of these lines. We show that the optical and the infrared line profile variations are consistent with a magnetospheric accretion scenario with a period of ~6days, smaller than the stellar rotation period 6.53days. Additionally, the optical lines present strong indications of a structure located beyond the co-rotation radius, which is modulated at a period of about 8.5days. We investigate whether a wind component, twisted or multiple accretion funnel flows, or an external disturbance in the inner disk could explain this structure. This work shows how much variable is the dynamics of this system on a time scale of a few years.
Seepage forces and confining pressure effects on piping erosion
Creators: name: Tomlinson, Scott Stewart
Publisher: name: University of British Columbia
Year: 2009

description: An experimental study of piping erosion is presented. Various artificial granular filter and soil combinations are tested in a permeameter under variable confining pressures to determine the critical gradient where soil erodes through the filter. Previous research concentrated on establishing a grain size ratio criteria, typically D[sub 15f]/D[sub 85s] <4, which separates stable from unstable filters. These works often ignored filtration formation phenomena and did not document the influence of variabilities such as confining pressure, filter thickness, and gradient flux. To adequately control all variables required a new permeameter and careful attention to sample preparation. Artificial glass beads were water pluviated to permit consistent samples. By monitoring head, settlement, confining pressure, amount of eroded soil, and water outflow the onset of piping can be determined. It is shown that grain size ratio is the most important parameter in piping. A soil/filter system with D[sub 15f]/D[sub 85s] < 8 will not fail, whereas a D[sub 15f]/D[sub 85s] > 12 will not retain soil. For 8 < D[sub 15f]/D[sub 85s] < 12, piping will only occur if the critical gradient is reached. The critical gradient is lowered if the head is rapidly increased, as a filtration zone is inhibited from forming. A very thin filter has a similar effect. Stability is slightly inversely related to confining pressure for small grain size ratios.
Development of a RFID sensitive tag dedicated to the monitoring of the environmental corrosiveness for indoor applications
Creators: name: Masri, I. El
name: Lescop, B.
name: Talbot, P.
name: Vien, G. Nguyen
name: Becker, J.
name: Thierry, D.
name: Rioual, Stéphane
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The environmental corrosiveness is governed for indoor applications by the presence of gaseous pollutants in air and levels of temperature and relative humidity. Its determination is a challenging task and requires the monitoring of thickness reduction of selected metals in the range of few tens of nanometers. The present work aims at developing an UHF RFID sensor dedicated to such measurements. The sensor is based on the coupling between the antenna of a commercial RFID tag and a thin layer of copper exposed to the environment. The ability of the proposed sensor to be sensitive to a variation of the metal thickness in the range of tens of nanometers is demonstrated experimentally through exposure tests in a climatic chamber. The results are supported by electromagnetic simulations performed in the case of a coupling between a dipolar antenna and a thin metallic layer.
In fairness we trust : children making sense of economic insecurity
Creators: name: Butler, Rose
Publisher: name: The Australian National University
Year: 2014
Subjects: subject: Economic anthropology Australia Victoria
subject: Economic security Australia Victoria
subject: Economics Sociological aspects
subject: Children Economic aspects Australia Victoria

description: This thesis examines a series of social and emotional strategies undertaken by children to cope with social situations that arise through economic insecurity. Drawing on 18 months fieldwork in regional Victoria with children, parents and two school communities, I argue that children in this cultural environment make sense of economic insecurity through the re-appropriation of cultural narratives of "fairness". I distill four sets of strategies that children develop and enact in order to cultivate and sustain feelings of belonging when faced with situations of economic uncertainty. I call these practices Going Without, Staying Within, Cutting Down and Managing Stigma, and show how each is distinctively tied to cultural ideas around fairness. As I evidence, these strategies are shaped by children's own experiences of classed and racialised identities, cultural constructions of stigma, and the socio-cultural, political and economic environment in which they live. Through this analysis, I show how cultural narratives around fairness, recreated by children in different social spaces of everyday life, provide an avenue through which to repatriate feelings of envy and sustain meaningful relationships with others. Furthermore, I demonstrate ways in which such actions, while generating forms of inclusion, potentially recreate boundaries of exclusion in children's social worlds. More broadly, I argue that children's understandings of economic insecurity in post-industrial contexts are deeply tied to the dominant cultural narratives that underpin their lives. I contend that such narratives intersect with market-based imperatives, neoliberal articulations of childhood, and the culture-making practices of children's own collectively-focused peer group interactions. In making sense of economic insecurity, children must strategically balance these interests as they both compete and converge, in ways that generate and sustain feelings of belonging. By focusing on children's uses of "fairness" in this local context, I further bring to light the overt and subtle social and emotional impacts of broad economic restructuring on children and parents in Australia. The ethnographic focus here moves between the collective worlds of children and the private lives of their families, illuminating how market-driven global and state changes in education and employment are negotiated and absorbed in relationships between children, their peers and their parents. As I demonstrate, these structural and social transformations surface in daily life through dilemmas over care, dignity and belonging. The ways in which children use the cultural resources available to manage such experiences forms the subject of this thesis.
The Spectral Sequence of Blazars - Status and Perspectives
Creators: name: Maraschi, L.
name: Ghisellini, G.
name: Tavecchio, F.
name: Foschini, L.
name: Sambruna, R. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The present status of the blazar spectral sequence is discussed, including new findings about blazars selected with different criteria than the original complete radio-samples. Despite extensive searches of blazars "breaking" the sequence, the original idea proposed 10 years ago, still seems to hold. On the other hand the forthcoming launch of the GLAST satellite will provide a new selection band for blazars and blazar related populations as well as fantastic progress on the spectra and variability behaviour of presently known blazars. The order of magnitude increase in sensitivity of GLAST will allow to detect gamma-rays from jets with lower power and/or lower beaming factor, thus sampling a much wider population.
description: 6 pages, 6 figures. Proceedings of the Conference "High-Energy Phenomena in Relativistic Outflows", September 24-28, 2007, Dublin (Ireland)
Security Dilemmas of a Small State: Cambodia's Foreign Policy towards China
Creators: name: Cheunboran, Chanborey
Publisher: name: The Australian National University
Year: 2019

description: This author of research argues that Cambodia's relations with China have been driven by three deterministic factors: (1) the revival of perceived security threats from its bigger and historically antagonistic neighbours, Thailand and Vietnam; (2) Phnom Penh's anticipation of a future Sino-centric regional order in Asia; and (3) China's increasingly important political and economic roles in the Kingdom. These three factors are crucial not only for the security and prosperity of Cambodia but also for the survival of the Hun Sen regime. Moreover, Cambodia's strategic options are limited. ASEAN was once the cornerstone of Cambodia's foreign policy. Recently, however, Phnom Penh's confidence in ASEAN has gradually diminished due to the perception among Cambodian foreign policymakers that ASEAN has not been effective enough to help Cambodia address its security challenges, particularly during the Cambodia-Thailand border dispute from 2008 to 2011. As far as Cambodia's alignment with the great powers is concerned, options are also limited. Among the US, Russia, France and Japan, Cambodian policymakers consider only Japan to be an important strategic partner in Cambodia's foreign policy diversification. Having said that, Phnom Penh's alignments with China and Japan have different values in favour of the former due to the perception that Tokyo's military and strategic role in the region is limited. Cambodia's strategic direction towards China can be categorized as an increasingly tight alignment. Cambodia might experience risks and vulnerabilities from such a relationship. There has been growing public resentment over China's political and economic clout in Cambodia. Within the public debate, many point out that there are correlations between China's growing influence in Cambodia and the regression of democracy, depletion of natural resources and the erosion of foreign policy autonomy in the Kingdom. There is also increasing concern that Cambodia might face a possible abandonment or entrapment in the great powers' conflicts. Worse still, Phnom Penh's increasingly tight alignment with Beijing has alienated other powers and Cambodia's neighbouring countries, which might invite them to interfere into the Kingdom's domestic affairs in order to protect and promote their interests. Therefore, the author of this research claims that it is too risky for Cambodia to have a tight alignment with China and that Cambodia should restrain its close relations with China in the form of a 'loose alignment'.
Roche tomography of cataclysmic variables -- III. Starspots on AE Aqr
Creators: name: Watson, C. A.
name: Dhillon, V. S.
name: Shahbaz, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a Roche tomography reconstruction of the secondary star in the cataclysmic variable AE Aqr. The tomogram reveals several surface inhomogeneities that are due to the presence of large, cool starspots. In addition to a number of lower-latitude spots, the maps also show the presence of a large high latitude spot similar to that seen in Doppler images of rapidly-rotating isolated stars, and a relative paucity of spots at a latitude of 40 degrees. In total, we estimate that some 18 per cent of the Northern hemisphere of AE Aqr is spotted. We have also applied the entropy landscape technique to determine accurate parameters for the binary system. We obtain optimal masses of M_1 = 0.74 solar masses, M_2 = 0.50 solar masses, a systemic velocity = -63 km/s and an orbital inclination of i = 66 degrees. Given that this is the first study to successfully image starspots on the secondary star in a cataclysmic variable, we discuss the role that further studies of this kind may play in our understanding of these binaries.
description: 16 pages, 14 figures (resolution lowered to reduce download time), accepted for publication in MNRAS
Several New Active Galactic Nuclei Among X-ray Sources Detected by INTEGRAL and SWIFT Observatories
Creators: name: Burenin, R. A.
name: Mescheryakov, A. V.
name: Revnivtsev, M. G.
name: Sazonov, S. Yu.
name: Bikmaev, I. F.
name: Pavlinsky, M. N.
name: Sunyaev, R. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the optical identifications of a set of X-ray sources from the all-sky surveys of INTEGRAL and SWIFT observatories. Optical data were obtained with Russian-Turkish 1.5-m Telescope (RTT150). Nine X-ray sources were identified as active galactic nuclei (AGNs). Two of them are hosted by nearby, nearly exactly edge-on, spiral galaxies MCG -01-05-047 and NGC 973. One source, IGR J16562-3301, is most probably BL Lac object (blazar). Other AGNs are observed as stellar-like nuclei of spiral galaxies, with broad emission lines in their spectra. For the majority of our hard X-ray selected AGNs, their hard X-ray luminosities are well-correlated with the luminosities in [OIII],5007 optical emission line. However, the luminosities of some AGNs deviate from this correlation. The fraction of these objects can be as high as 20%. In particular, the flux in [OIII] line turns to be lower in two nearby edge-on spiral galaxies, which can be explained by the extinction in their galactic disks.
description: 9 pages, 3 figures, accepted for publication in Astronomy Letters, the original text in Russian can be found at http://hea.iki.rssi.ru/~rodion/poptid.pdf
Quantum Classification of Malware
Creators: name: Seymour, John Jefferson
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: D-Wave
Machine Learning
Malware Analysis
NGrams
Quantum Computing

description: The D-Wave architecture is a unique approach to computing which utilizes quantum annealing to solve discrete optimization problems. Applications for D-Wave machines include binary classification, complex protein-folding models, and heuristics for intractable problems such as the Traveling Salesman Problem. This thesis presents a methodology for translating the classification problem for malicious executables into an optimization problem which a D-Wave quantum annealer can solve using the Blackbox embedding software. We also investigate the viability of the D-Wave Two's application to malware analysis and prevention in current form. We show that using a D-Wave Two with Blackbox to classify malicious software is possible with cross-validation accuracy comparable to classical machine learning algorithms, but with significant overhead.
Heavy baryon mass spectrum from lattice QCD with 2+1 flavors
Creators: name: Na, Heechang
name: Gottlieb, Steven
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the heavy baryon mass spectrum on gauge configurations that include 2+1 flavors of dynamical improved staggered quarks. A valence clover heavy quark is combined with two improved staggered light quark propagators to form baryons with different flavors. We are using MILC coarse gauge configurations with a lattice spacing of about 0.12 fm. In this preliminary investigation, we explore the chiral limit by studying two light sea quark masses, three different strange valence quark masses, and nine different light valence quark masses ranging from 0.1 to 0.4 times the nominal strange quark mass.
description: 7 pages, 7 figures, 1 table, talk presented at Lattice 2006 (Spectroscopy)