Miracle-dz/UniFAR-FTUs huggingface dataset:
Variations on a theorem by van der Waerden

The central result presented in this thesis is van der Waerden’s theorem on arithmetic progressions. Van der Waerden’s theorem guarantees that for any integers k and r, there is an n so that however the set {1, 2, . , n} is split into r disjoint partition classes, at least one partition class will contain a k-term arithmetic progression. Presented here are a number of variations and generalizations of van der Waerden’s theorem that utilize a wide range of techniques from areas of mathematics including combinatorics, number theory, algebra, and topology. I would like to thank my advisor, Dr. David Gunderson, for his guidance, encouragement and the boundless energy and enthusiasm that he devoted to my research. I am greatly appreciative of the tremendous amount of time and effort he spent helping me throughout the process of preparing this thesis. I would also like to express my thanks to my advisory committee, Dr. R. Craigen, Dr. R. Padmanabhan and Dr. B. Landman as well as Dr. B. Li. I am grateful for support received from the Natural Sciences and Engineering Research Council of Canada in the form of a Postgraduate Scholarship. Finally, I am eternally indebted to my family for their unending love and support.
Field reconstruction from proton radiography of intense laser driven magnetic reconnection

Magnetic reconnection is a process that contributes significantly to plasma dynamics and energy transfer in a wide range of plasma and magnetic field regimes, including inertial confinement fusion experiments, stellar coronae, and compact, highly magnetized objects like neutron stars. Laboratory experiments in different regimes can help refine, expand, and test the applicability of theoretical models to describe reconnection. Laser-plasma experiments exploring magnetic reconnection at a moderate intensity (IL ∼ 1014 W cm−2) have been performed previously, where the Biermann battery effect self-generates magnetic fields and the field dynamics studied using proton radiography. At high laser intensities ( ILλL2>1018 Wcm−2μm2), relativistic surface currents and the time-varying electric sheath fields generate the azimuthal magnetic fields. Numerical modeling of these intensities has shown the conditions that within the magnetic field region can reach the threshold where the magnetic energy can exceed the rest mass energy such that σcold = B2/(μ0nemec2) > 1 [A. E. Raymond et al., Phys. Rev. E 98, 043207 (2018)]. Presented here is the analysis of the proton radiography of a high-intensity (∼1018 W cm−2) laser driven magnetic reconnection geometry. The path integrated magnetic fields are recovered using a “field-reconstruction algorithm” to quantify the field strengths, geometry, and evolution.Magnetic reconnection is a process that contributes significantly to plasma dynamics and energy transfer in a wide range of plasma and magnetic field regimes, including inertial confinement fusion experiments, stellar coronae, and compact, highly magnetized objects like neutron stars. Laboratory experiments in different regimes can help refine, expand, and test the applicability of theoretical models to describe reconnection. Laser-plasma experiments exploring magnetic reconnection at a moderate intensity (IL ∼ 1014 W cm−2) have been performed previously, where the Biermann battery effect self-generates magnetic fields and the field dynamics studied using proton radiography. At high laser intensities ( ILλL2>1018 Wcm−2μm2), relativistic surface currents and the time-varying electric sheath fields generate the azimuthal magnetic fields. Numerical modeling of these intensities has shown the conditions that within the magnetic field region can reach the threshold where the magnetic energy can exceed the rest.
MULTIPLE STRATEGIES FOR REDUCING OPEN DEFECATION IN PASURUAN REGENCY, EAST JAVA, INDONESIA.

1. Postgraduate student of environmental science, brawijaya university. 2. Postgraduate lecturer of brawijaya university. Manuscript Info Abstract . Manuscript History Received: 17 May 2019 Final Accepted: 19 June 2019 Published: July 2019
Routing for Flying Networks using Software-Defined Networking

Nos ultimos anos, os Veiculos Aereos Nao Tripulados (UAVs) estao a ser usados de forma crescente em inumeras aplicacoes, tanto militares como civis. A sua miniaturizacao e o preco reduzido abriram o caminho para o uso de enxames de UAVs, que permitem melhores resultados na realizacao de tarefas em relacao a UAVs independentes. Contudo, para permitir a cooperacao entre UAVs, devem ser asseguradas comunicacoes continuas e fiaveis.Alem disso, os enxames de UAVs foram identificados pela comunidade cientifica como meio para permitir o acesso a Internet a utilizadores terrestres em cenarios como prestacao de socorros e Eventos Temporarios Lotados (TCEs), tirando partido da sua capacidade para transportar Pontos de Acesso (APs) Wi-Fi e celulas Long-Term Evolution (LTE). Solucoes que dependem de uma Estacao de Controlo (CS) capaz de posicionar os UAVs de acordo com as necessidades de trafego dos utilizadores demonstraram aumentar a Qualidade de Servico (QoS) oferecida pela rede. No entanto, estas solucoes introduzem desafios importantes no que diz respeito ao encaminhamento do trafego.Recentemente, foi proposta uma solucao que tira partido do conhecimento da CS sobre o estado futuro da rede para atualizar dinamicamente as tabelas de encaminhamento de modo a que as ligacoes na rede voadora nao sejam interrompidas, em vez de se recuperar da sua interrupcao, como e o caso na maioria dos protocolos de encaminhamento existentes. Apesar de nao considerar o impacto das reconfiguracoes na rede de acesso, como consequencia da mobilidade dos APs, ou o balanceamento da carga na rede, esta abordagem e promissora e merece ser desenvolvida e implementada num sistema real.Esta dissertacao tem como foco a implementacao de um protocolo de encaminhamento para redes voadoras baseado em Software-Defined Networking (SDN). Especificamente, aborda os problemas de mobilidade e de balanceamento da carga na rede de uma perspetiva centralizada, garantindo simultaneamente comunicacoes ininterruptas e de banda-larga entre utilizadores terrestres e a Internet, permitindo assim que os UAVs se possam reposicionar e reconfigurar sem interferir com as ligacoes dos terminais a rede.
Multitask TSK Fuzzy System Modeling by Jointly Reducing Rules and Consequent Parameters

Existing multitask Takagi–Sugeno–Kang (TSK) fuzzy modeling methods always produce high complex fuzzy models with numerous redundant rules and consequent parameters. To this end, we propose a novel multitask TSK fuzzy modeling method called mtSparseTSK, which learns a compact set of fuzzy rules and shared consequent parameters across tasks in a unified procedure. Specifically, we consider the fuzzy rule reduction and consequent parameter selection across tasks by devising novel group sparsity regularizations in the learning criterion of the model. We also integrate the intertask relations in the proposed TSK model for multitask learning. We fully utilize the block structure in the TSK fuzzy models in formulating a joint block sparse optimization problem and develop a procedure for alternating direction method of multipliers (ADMMs) to find the optimal solution of the problem. Experiments on the synthetic and real-world datasets demonstrate the distinctive performance of the proposed methods over the existing ones on multitask fuzzy system modeling.
FORWARD AND INVERSE PROBLEM FOR NEMATIC LIQUID CRYSTALS

This thesis starts with an introduction to liquid crystal properties, which are needed to proceed with this research. From the dielectric tensor which appears in the Maxwell equations, we were able to obtain a relationship between the elements on the main diagonal of the dielectric tensor. This relationship has been discussed and illustrated with some examples for both positive and negative birefringence. By introducing a constrain on the Berreman model, we were able to derive a 2 × 2 differential equation in matrix form which works for both normal and oblique incident. This equation gives us a simple and intuitive means to analyze the evolution of light through all sorts of media i.e. isotropic, anisotropic with a fixed transmission axis and anisotropic with a twisted transmission axis of anisotropy. One of the objectives of this research was to find the right technique to solve the 2 × 2 dynamic equation. Fortunately, the classic Floquet’s theory guarantees the existence of the solution and it gives some of its characteristics. In fact, we were able to solve the 2×2 Schrodinger equation by a new method which we called it in this thesis a rotational frame method. The obtained solution is consistent with Floquet’s theory and agrees totally with the Jones solutions. Also, this solution allows us to test the Berreman approximation.Finally, in this research we were able to encode the orientation of the optical axis inside a liquid crystal sample, into the potential of the Schrodinger equation. As a consequence of that, solving the inverse problem of the Schrodinger equation that is recovering the potential, is indeed recovering the orientation of the director inside the sample. The Berreman inverse problem and its corresponding linearized problem has been considered in this thesis. In these sections, we give a rigorous derivation for the Frechet derivative.
The Shapley Pre-value for Fuzzy Cooperative Games

In this paper for fuzzy cooperative games we generalize the classical Shapley value through using one of the known approaches for its redefinition. For fuzzy cooperative games formalized as well the Shapley axioms. For the fuzzy pre-value of Shapley we research certain of known properties that hold true for classical Shapley value.
Ultra-low power micro Wi-Fi scattering communication device

A Wi-Fi scatter communication method based on microcontroller unit (MCU) is proposed, and an ultra-low power micro Wi-Fi scatter communication device μWi-Fi is designed and implemented. First, according to the characteristics of the microcontroller, the software virtual modulation method and the serial communication port direct memory access (DMA) transmission method is proposed to realise Wi-Fi scattering communication. Then the MCU + exclusive OR (XOR) baseband architecture is proposed to further reduce the main frequency of the microcontroller and the system power consumption. The communication test and power consumption measurement results show that μWi-Fi can generate signals conforming to the IEEE802.11b standard, which can be received and forwarded by universal Wi-Fi routers. Its effective communication distance reaches 15 m, its communication peak current reaches 720 μA, and its standby current reaches 390 nA. Compared with traditional internet of things (IOTs) Wi-Fi devices, μWi-Fi can not only reduce the power consumption of Wi-Fi communication by 2–3 orders but also has a simple composition and low cost, which is very helpful for the rapid development of Wi-Fi IoT products.
Non-Subsampled Contourlet Transform-Based Effective Denoising of Medical Images

Noise removal in medical images remains a challenge for the researchers because noise removal introduces artifacts and blurring of the image. Developing medical image denoising algorithm is a difficult operation because a tradeoff between noise reduction and the preservation of actual features of image has to be made in a way that enhances and preserves the diagnostically relevant image content. A special member of the emerging family of multiscale geometric transforms is the contourlet transform which effectively captures the image edges and contours. This overcomes the limitations of the existing method of denoising using wavelet and curvelet. But due to down sampling and up sampling, the contourlet transform is shift-variant. However, shift-invariance is desirable in image analysis applications such as edge detection, contour characterization, and image enhancement. In this chapter, nonsubsampled contourlet transform (shift-invariance transform)-based denoising is presented which more effectively represents edges than contourlet transform.
Erratum: The fifth main-sequence magnetic B-type star showing coherent radio emission: Is this really a rare phenomenon?

We report the discovery of intense, highly directional radio emission from the Bp star HD 35298, which we interpret as the consequence of Electron Cyclotron Maser Emission (ECME). The star was observed with the Giant Metrewave Radio Telescope near the rotational phases of both magnetic nulls in band 4 (550–750 MHz) and one of the nulls in band 5 (1060–1460 MHz). In band 4, we observed flux density enhancement in both circular polarizations near both magnetic nulls. The sequences of arrival of the left and right circularly polarized pulses are opposite near the two nulls. In band 5, we did not have circular polarization information and hence measured only the total intensity light curve, which also shows enhancement around the magnetic null. The observed sequence of the circular polarization signs in band 4, compared with the longitudinal magnetic field curve, is able to locate the hemisphere from which ECME arises. This observational evidence supports the scenario of ECME in the ordinary mode, arising in a magnetosphere shaped like an oblique dipole. HD 35298 is the most slowly rotating and most distant main-sequence magnetic star from which ECME has been observed.
Evolution of Dissipative Low-Frequency Rogue Waves in Superthermal Dusty Plasmas

The evolution of dissipative dust-ion acoustic (DIA) rogue waves is studied in a collisional dusty plasma with superthermal electrons. Multiple-time-scale reduction shows that the nonlinear dynamics of low-frequency waves reduces to a modified nonlinear Schrödinger (mNLS) equation. This equation captures the main features of modulated waves and shows a criterion in determining the maximum time for the occurrence of the modulational instability. It is found that the impact of such an energetic tail of electrons is to narrow the stability region in a dusty plasma with source and sink. Within the instability window, we have shown that the mNLS equation in a weakly dissipative plasma is responsible for the formation of DIA rogue waves. The possible region for the existence of dissipative rogue waves is precisely defined for physical parameters. It is shown that the rogue wave profile is very sensitive to any changes in the electron superthermality and dissipative parameters.
Data Discovery Paradigms: User Requirements and Recommendations for Data Repositories

As data repositories make more data openly available it becomes challenging for researchers to find what they need either from a repository or through web search engines. This study attempts to investigate data users’ requirements and the role that data repositories can play in supporting data discoverability by meeting those requirements. We collected 79 data discovery use cases (or data search scenarios), from which we derived nine functional requirements for data repositories through qualitative analysis. We then applied usability heuristic evaluation and expert review methods to identify best practices that data repositories can implement to meet each functional requirement. We propose the following ten recommendations for data repository operators to consider for improving data discoverability and user’s data search experience: 1. Provide a range of query interfaces to accommodate various data search behaviours. 2. Provide multiple access points to find data. 3. Make it easier for researchers to judge relevance, accessibility and reusability of a data collection from a search summary. 4. Make individual metadata records readable and analysable. 5. Enable sharing and downloading of bibliographic references. 6. Expose data usage statistics. 7. Strive for consistency with other repositories. 8. Identify and aggregate metadata records that describe the same data object. 9. Make metadata records easily indexed and searchable by major web search engines. 10. Follow API search standards and community adopted vocabularies for interoperability.
Advanced photonic signal processing and hybrid integrated microwave photonic systems

In this thesis, we address the interdisciplinary research field known as “microwave photonics” (MWP), which has attracted considerable interest in scientific and industrial communities, and we investigate how integrated photonic technologies can be exploited to realize integrated microwave photonic systems. In brief, microwave photonics explores and develops methods and technologies to generate, process and distribute microwaves, millimeter waves and terahertz radiation via a photonic approach, i.e. in the optical domain. The main motivation for this approach is that systems based on microwave photonic technology can benefit from several advantages that are inherent to optical systems, such as high speed, low and frequency-independent propagation loss and reduced electromagnetic interference. However, although there is an indisputable and significant potential of microwave photonics, it has not yet been applied in real contexts. The main reason is that microwave photonics so far had to rely mostly on discrete components, which render according microwave photonic systems bulky, unstable and fragile. In order to overcome these limitations, while still taking advantage of the named, great opportunities, research and technology have begun targeting integration of microwave photonic systems, with the goal to enable the processing of microwave and millimeter waves via photonic chips.
Hyperentangled Time-Bin and Polarization Quantum Key Distribution

Fiber-based quantum key distribution (QKD) networks are currently limited without quantum repeaters. Satellite-based QKD links have been proposed to extend the network domain. We have developed a quantum communication system, suitable for realistic satellite-to-ground communication. With this system, we have executed an entanglement-based QKD protocol developed by Bennett, Brassard, and Mermin in 1992 (BBM92), achieving quantum bit error rates (QBER) below 2$\%$. More importantly, we demonstrate low QBER execution of a higher dimensional hyperentanglement-based QKD protocol, using photons simultaneously entangled in polarization and time-bin, which has a distinct advantage over BBM92. We show that our protocol is suitable for a space-to-ground link, after incorporating Doppler shift compensation, and verify its security using a rigorous finite-key analysis.
2D GeP as a Novel Broadband Nonlinear Optical Material for Ultrafast Photonics

A new member of the IV–V compounds, germanium–phosphorus (Ge–P) compounds, has been shown in experiment and theory to have a tunable bandgap (Eg), excellent chemical stability, strong in‐plane anisotropy, and wide‐range optical absorption, all indicating a promising future in electronic and optoelectronic applications. In this work, the application potential of Ge–P compounds as nonlinear optical (NLO) materials in ultrafast photonics is studied for the first time. The strong light–matter interaction, broad and tunable Ep, and broadband and strong optical response make GeP a likely NLO material for photonics, especially in infrared photonic devices. In addition, 2D GeP nanosheets are mixed with poly(vinylidene fluoride) (PVDF) to obtain a GeP@PVDF composite film, which further improves the stability of the GeP and, for the development of organic photonic devices, helps to slow its degradation. From Z‐scan data and fitting results, it is found that GeP has an excellent broadband NLO response. Moreover, using the GeP@PVDF composite film as a saturable absorber, a high‐stability femtosecond laser with a 722 fs pulse width is obtained in the telecommunications band. Preliminarily, Ge–P compounds display excellent optical properties suggesting that they may be used as NLO materials in advanced photonic devices.
Quadratic programming on the positive orthant with a quasiconvex objective function

Neste trabalho, estudaremos uma classe de matrizes simetricas reais que chamaremos de subdefinida, essas matrizes incluem as semidefinidas positivas. Para nosso proposito, nos concentraremos nas matrizes subdefinidas meramente positivas, isto e, aquelas matrizes que sao subdefinidas positivas, mas que nao sao positivas semidefinidas. Vamos discutir as funcoes quadraticas em Rn + e mostrar que essas funcoes sao quasiconvexas nao convexas, quando sua representacao matricial e dada por uma matriz subdefinida meramente positiva. Alem disso, apresentaremos um resultado de grande importância na programacao quadratica, pois permite reduzir a quasiconvexidade dessas funcoes quadraticas nao-convexas a pseudoconvexidade no ortante semipositivo. Por fim, estudaremos o metodo do gradiente condicional para resolver o problema de programacao quadratica, em que a funcao objetivo e deste tipo.
Clinical consistency in tracheostomy management

The study aim was to determine the current management patterns of clinicians across various settings in Australia and examine these practices with respect to levels of clinical consistency and evidence-based practice. A questionnaire was sent to 90 speech pathologists with experience in tracheostomy management. Sixty-eight clinicians responded, and their data were analyzed in relation to majority patterns and level of clinical consistency as per Mathers-Schmidt and Kurlinski (2003). Overall, the results suggested a moderate to high level of clinical consensus for the majority of issues examined. In most cases clinical practice was consistent with existing expert opinion, scientific research evidence, or national practice guidelines. There were, however, some aspects of clinical care that had little clinical consensus. Lack of consensus appeared to stem from either conflicting expert clinical opinion or absent/emerging scientific support. Some aspects of clinical care, including working in teams and the use of instrumental procedures in dysphagia assessment, were found to be inconsistent with best practice, based on current available research evidence. The current data highlight the need for more research evidence in order to establish true evidence-based practice guidelines and optimize clinical consistency of speech pathology management for the tracheostomized patient.
Book embedding of 3-crossing-critical graphs with rational average degree between 3.5 and 4

We consider the graphs P(m, n) with average degree between 3.5 and 4, made up of m identical pieces together with n identical pieces glued together in a circular fashion, such that in any drawing of P(m, n) on the plane, there are exactly three pairwise edges crossings, and when deleting any edge of the graph, the number of crossings of the remaining graph decreases. We then embed P(m, n) into a book such that the vertices are put on a line called the spine and the edges are put on half-planes called the pages, which have the spine as their common boundary, without crossings. In this paper, we show that the minimal number of pages needed to embed P(m, n) into a book is three.