Miracle-dz/UniFAR-FTUs huggingface dataset:
Probing ultrafast dynamics of photo-excited Bismuth nanostructure

The present work shows the primarily results of ultrafast dynamics of photo-excited Bismuth (Bi) nanostructure through Femtosecond optical pump-probe spectroscopy technique. The study is an attempt to explore distinctive features of Bi nanostructure manifested due to its unusual electronic properties. The results reveal Bismuth charge carrier dynamics in terms of positive $\Delta {\mathrm {A/A}}$ signal in visible-NIR region due to photo-excitation of Bi nanostructure by ultrafast pulses. The positive signal is attributed to excited state absorption arises due to various reasons like surface plasmons and phonons in visible region and interband plasmonic resonances in NIR region. The observed features of ultrafast dynamics reflect potential of Bi for applications of solar energy harversting.
A stereoscopic symmetrical quadruple mass gyroscope

A stereoscopic symmetrical quadruple hair gyroscope (SSQHG) based on capacitive sensing is presented in the paper. A symmetrical device architechture is proposed to realize the differential detection of Coriolos acceleration, thereby effectively eliminate the common mode interference of axial acceleration. Four stereoscopic hair masses are adopted to optimize the angular rate sensitivity performance. The frequency distribution simulations based on Finite Element Method (FEM) program ANSYS have been performed to implement the structural parameters identification. An analog closed-loop self-oscillation driving system and an open-loop sensing system are proposed to detect the angular rate. The preliminary experimental results demonstrate that the atmospheric packaged prototype exhibits an angular rate sensitivity of 7.98 mV/°/s with a drive mode frequency of 465 Hz and a sense mode frequency of 500 Hz.
Permittivity and Conductivity Estimation of Biological Scenarios via 3D Microwave Tomography

The estimation of the effective electrical properties of biological tissues is relevant to different medical applications, ranging from hyperthermia treatment planning to dosimetry. In this contribution, we introduce a novel inverse scattering approach to cope with this problem. This latter is relevant to microwave tomography and is herein formulated in 3D geometry. More in details, the procedure performs the inversion of measured fields scattered by the investigated biological scenario by taking advantage from the spatial priors derived from segmented medical images and conveniently representing the unknown electrical properties.
Enabling Overclocking Through Algorithm-Level Error Detection

In this paper, we propose a technique for improving the efficiency of hardware accelerators based on timing speculation (overclocking) and fault tolerance. We augment the accelerator with a lightweight error detection mechanism to protect against timing errors, enabling aggressive timing speculation. We demonstrate the validity of our approach for the convolution layers in convolutional neural networks. We present an implementation of a fault-tolerant convolution layer accelerator combined with the lightweight error detection. The error detection mechanism we have developed works at the algorithm-level, utilizing algebraic properties of the computation, allowing the full implementation to be realized using High-Level Synthesis tools. Our prototype on ZC706 demonstrated 68% - 77% higher throughput with negligible overhead.
Channel estimation for MB-OFDM UWB based on pilot sequence channel shortening

A novel algorithm is proposed for MB-OFDM UWB based on channel shortening integrating the DFT algorithm. A channel shortening equalization based on MMSE is added to the receiver so that the length of channel duration is shorter than the length of cp. And the combined channel is estimated using the received signals after the shortening equalization. Finally the channel is estimated after deconvolution. It can improve the serious status because of the Inter Symbol Interference (ISI) and Inter Carrier Interference (ICI) resulted in insufficient of length of cp. Simulation demonstrates the proposed algorithm can reduce the Mean Square Error.
Physical Identification of Common Clusters for Outdoor Microcells

In geometry-based stochastic models, Interacting Objects (IOs) define scattering obstacles. The identification of groups of waves (clusters) linked to IOs is addressed in this paper, based on measurements conducted in an outdoor microcellular scenario at 3.8 GHz. By contrast to the classical approach clustering waves in the parameter space, the proposed approach is able to identify physical IOs. Moreover, a method to define common clusters at different mobile locations is further described.
New developments in the pathology of malignant lymphoma: a review of the literature published from August

IntroductionThe knowledge of professionals generally has a half-time ofabout 5 years. So half of everything you will read in thisreview will be outdated 5 years from now. That may be notso bad, but it also means that everything you have learnedmore than 5 years ago is only half true, and do you knowwhich half? Keeping up with the literature is an almostimpossible task and never complete. With the introductionof the new WHO classification at the EAHP/SH workshopin Bordeaux last year, several major changes are introducedinto our daily work. This will be the subject of review inthe next issue of the Journal of Hematopathology. For now,there is also quite some interesting data to digest:Biology of lymphomaHodgkin lymphomaThe successful meeting of the EAHP in Bordeaux focusedon tumor microenvironment, an exiting but difficult area.We know how important the stroma and its cells are fortumor growth, but the complexity of the interplays betweencells, reporter molecules, and matrix is so large that wehave only limited understanding. We may have to awaitfurther large steps in systems biology to get a grasp of thisby modeling. Nevertheless, interesting work is done inespecially Hodgkin lymphoma (HL), a tumor in which theenvironment is remarkably large. Chetaille et al. [1] studied63 cases of classical HL(cHL) by microarray and found thatEBV-positive cases differed in profile from EBV-negativecases by the presence of a Th1 response gene signature.Furthermore, they found that when an overexpression ofgenes related to B cells and apoptosis were present, patientshad a favorable outcome. They were able to confirm this byimmunohistochemistry: poorer prognosis in the case ofhigh percentage of either TIA-1-positive reactive cells ortopoisomerase-2-positive tumor cells, whereas high numb-ers of BCL11A, FOXP3, or CD20-positive reactive cellshad a favorable influence. Immunodetection of BCL11A, amarker of both B cells and plasmacytoid dendritic cells, hadthe strongest predictive value. EBV-positive cHL (n=108)was also studied by Asano et al. [2], and in comparisonwith age-related EBV-positive B-cell proliferations (n=34),since also the latter often has an inflammatory backgroundsimilar to cHL. cHL had a lower ratio of geographicalnecrosis, lower number of cytotoxic T cells, and a betterprognosis. Many more of such studies will be neededbefore there will be a reliable marker set that predicts whoof the relatively few patients with cHL will relapse.B-cell lymphomasAlso in B-cell lymphomas, the microenvironment is subjectof a study: de Jong et al. [3] studied with immunohisto-chemistry 61 pretreatment biopsies from patients treated ina clinical trial and found that the prognostic impact wasdifferent for the two treatment arms. CD69 expression ontumor cells was a poor prognostic sign, and an interfollic-ular infiltrate of FoxP3-positive T cells was a goodprognostic sign irrespective of the treatment arm, and theauthors suggest that a dense infiltrate of FoxP3-positive Tcells, dense and interfollicular infiltrate of CD68-positive
A Bandwidth Enhanced 915 MHz Antenna for IoT Wrist-Watch Applications

This paper presents a 915 MHz planar inverted-F antenna (PIFA) topology for a wrist-worn wireless sensor application. When compared with a conventional PIFA implementation, an impedance bandwidth enhancement of more than 100% is achieved. The bandwidth enhancement is realized with inclusion of a parasitic element that excites an additional mode close to the resonant frequency. A parametric analysis of the key parameters is performed in order to optimize the antenna for 915 MHz operation. The measured results for the on-body prototype antenna show a −10 dB bandwidth of 26.4 MHz and a Peak Realized Gain of −0.57 dBi at 915 MHz. The simulated peak radiation efficiency of 46.8% is achieved. In addition, the design exhibits a low specific absorption rate (SAR) value of 0.004 W/kg.
Evaluation of efficient XML interchange (EXI) for large datasets and as an alternative to binary JSON encodings

Abstract : Current and emerging Navy information concepts, including network-centric warfare and Navy Tactical Cloud, presume high network throughput and interoperability. The Extensible Markup Language (XML) addresses the latter requirement, but its verbosity is problematic for afloat networks. JavaScript Object Notation (JSON) is an alternative to XML common in web applications and some non-relational databases. Compact, binary encodings exist for both formats. Efficient XML Interchange (EXI) is a standardized, binary encoding of XML. Binary JSON (BSON) and Compact Binary Object Representation (CBOR) are JSON-compatible encodings. This work evaluates EXI compaction against both encodings, and extends evaluations of EXI for datasets up to 4 gigabytes. Generally, a configuration of EXI exists that produces a more compact encoding than BSON or CBOR. Tests show EXI compacts structured, non-multimedia data in Microsoft Office files better than the default format. The Navy needs to immediately consider EXI for use in web, sensor, and office document applications to improve throughput over constrained networks. To maximize EXI benefits, future work needs to evaluate EXI's parameters, as well as tune XML schema documents, on a case-by-case basis prior to EXI deployment. A suite of test examples and an evaluation framework also need to be developed to support this process.
Multi-Mode Antenna Concept based on Symmetry Analysis of Characteristic Modes

A multi-mode antenna concept based on a symmetry analysis of characteristic modes is presented for use in massive MIMO antenna arrays. A hexagonal plate is chosen as the basis of the antenna concept due to its interesting geometric properties. In particular, a symmetry analysis using group theory and representation theory is conducted in conjunction with a characteristic mode analysis, yielding that a hexagonal plate offers eight mutually orthogonal sets of characteristic surface current densities. On this basis, eight uncorrelated antenna ports are defined by means of the irreducible representations of the symmetry group.
Reducing Motion Artifacts in Microwave-Based Hemorrhagic Stroke Detection

The use of microwave technology for brain stroke detection opens up the opportunity for developing low-cost transportable devices which can be employed for rapid and prehospital detection of bleeding in patients with traumatic brain injury. Since the detection relies on changes in the scattering parameters of the tissues during pathological conditions, the movements in head or the antennas can deteriorate the detection accuracy. As a countermeasure to this problem, we introduce a technique for reducing the sensitivity of the detection system to motion artifacts. Via analyzing the scattering from an anatomically accurate model of human brain, we evidence that the channels between different pairs of antennas exhibit significantly different levels of sensitivity to the movement. Using this as a ground truth, we develop a generalized singular value decomposition (GSVD)-based approach for assigning appropriate weights to the channels between different antennas such that the probability of correct bleeding detection is maximized.
Analysis of SIW-based Antennas with Arbitrary Slot Shapes

In this paper, we propose a basis function sets hybridization for the Mode Matching/Moment Method analysis of SIW slot antennas. In particular, Rao-Wilton-Glisson (RWG) basis functions are used to describe the equivalent magnetic current distributions on arbitrarily shaped slots. Meanwhile, the code employs entire-domain sinusoidal functions for thin rectangular slots. Such an approach aims at providing both fast computing and accurate current description for a wide variety of slot geometries. These aspects are crucial for large SIW antenna optimization. A validation by comparison with a commercial software results is presented.
Stacked patch antenna and hybrid beamforming network for 5G picocell applications

This paper addresses the design of an antenna array for a portable picocell station with omnidirectional coverage. The proposed solution includes a stacked patch antenna as a single radiating element of the antenna array and a hybrid beamforming network. The antenna element works at 26 GHz with a bandwidth of 20% and a gain of approximately 8.5 dB along the operational bandwidth. The antenna is fed by a suspended stripline transitioned from a waveguide. This antenna element is used to compute a 5×12-element antenna array fed by the hybrid beamforming network. Results are analytically obtained for a fixed analog beamforming network that generates a csc2 pattern shape in elevation. Additionally, a digital beamforming network is computed to perform beamsteering for a desired set of constraints in the azimuth plane. Simulated results of the complete system yield promising insights on the capacity of the proposed design to provide omnidirectional coverage.
Uniting The Trinity of Ferroelectric HfO2 Memory Devices in a Single Memory Cell

The polarization reversal in ferroelectric HfO2 is adopted to store information in three distinct device classes – ferroelectric field effect transistors (FeFET), ferroelectric capacitors (FeCAP) and ferroelectric tunnel junctions (FTJ). Common to all three concepts is the adoption of a ferroelectric layer stack that acts either as gate dielectric in the FeFET or as the capacitor dielectric and tunneling barrier in the FeCAP or FTJ, respectively. A composite structure including an inevitably or purposefully formed dielectric layer is frequently adopted. In this work we report on the co-existence of all three memory concepts within one device structure and propose a 2T1C ferroelectric memory cell that allows the operation and comparative characterization of the trinity of ferroelectric memory devices.
Design of a Perforated Flat Luneburg Lens Antenna Array for Wideband Millimeter-Wave Applications

Antenna array integrated with a flat Luneburg lens to form directive beam-steering system in a wideband millimeter-wave frequency range is investigated. The study and design of a perforated gradient index dielectric flat lens antenna for RF repeater application in V- and W- band (45 ‒ 110 GHz) is presented. The flat Luneburg lens is designed to have a focal point away from its surface to enhance the radiation in a particular direction via a beam-switching system. Scanning capability of ±30° in both azimuth and elevation planes over the entire frequency range is demonstrated. Wider scan-beam angles at expense of higher scan losses are achievable by using the same type of lens configuration with different dimensions. Furthermore, these lenses are easy and cost-effective to prototype while maintaining the straightforward integration with antenna feed manifolds.
Time diversity improvements in FLEX-TD new generation paging system

The world's pager market shows rapid growth. People want their pagers to be able to receive more information. To accommodate these demands, the FLEX-TD high-speed radio paging system was developed and standardized in Japan as an enhanced new generation high capacity paging system. The FLEX-TD system employs time diversity (TD) reception to obtain good page success rates and to minimize the number of base stations necessary to duplicate the service area of the conventional system. This paper focuses on the TD reception schemes employed and discusses their performance.
Consideration of Variable Operating States in a Data-Based Prognostic Algorithm

A technical system's availability is vital for economic efficiency. Especially, unscheduled downtime has a major impact on economic efficiency in most branches. Prognostics and health management (PHM) is an emerging discipline which enables downtime scheduling while using as most as possible of a component's wear margin. Common approaches rely on data-based algorithms that are trained with acquired sensor data and aim to model the degradation behavior in order to predict the degradation curve as well as the remaining useful life (RUL). Most data-based approaches examine a rather static operating condition of a unit under test (UUT), i.e. the load or number of revolutions is not varied while generating run to failure data of a component like bearings. While this assumption can be held for several components, there are those that are operated in a varying state. An aircraft's control surface actuator is an exemplary component that sees different loads through varying airspeed, weather and the flight mission. Since these variations influence the degradation behavior, they have to be considered in a prognosis algorithm. In this paper, a prognosis algorithm is proposed that incorporates a varying operating state, where an operating state is characterized by the parameters which significantly influence the degradation behavior. For a final discussion of the performance improvement, a simulated dataset is generated as input for the proposed and a reference algorithm. It is shown that the proposed algorithm achieves a better prediction performance compared to the reference algorithm that does not incorporate the varying operating state.
Multi-port Slot Array Antenna for Millimeter-wave Direction Finding and Beam-forming Applications

A simple multi-port antenna structure is proposed which can be used for direction finding (DF) and beam-forming applications in the receive and transmit modes, respectively. The proposed antenna offers unique functionalities in both receive and transmit modes. For DF applications in the receive mode, the beam-scanning laws of each antenna array is engineered to cover a given sector of space and the back-end of the system will feature a power sensing mechanism to monitor the power received at all ports. In the transmit mode, the proposed antenna can be used for beam-forming applications by engineering the individual port excitation and the antenna sub-arrays. The proposed antenna structure characteristics are demonstrated using full-wave simulations at 58-61 GHz based on circularly polarized slot arrays using substrate integrated waveguide (SIW) technology. Initial results show the antenna features high angle of arrival (AoA) resolution and a wide sector coverage, making it a good candidate for 5G wireless systems.
Compact UHF RFID Antenna for On-body Applications

In this paper, a compact antenna design is presented which can be used for a passive RFID UHF tag in close proximity to the human body. The design is tuned for the European RFID standard 868 MHz band. The results show that the performance of the antenna is not significantly degraded even when it is placed 2 mm away from the human body. The antenna has a small size compared with the wavelength at the operating frequency, occupying the area of a credit card (80 mm × 50 mm) and having only a 4 mm thickness. Compared with the examples in literature and despite its small size, the design is one of the most efficient even in free space. It uses inexpensive FR4 printing manufacturing technology. The simulated read range of the RFID tag when equipped with a commercial RFID tag chip is of 9 m when it is placed on the human body and the reader and tag are aligned.
Power Loss Model and Efficiency Analysis of Three-Phase Inverter Based on SiC MOSFETs for PV Applications

This paper presents the power loss model analysis and efficiency of three-level neutral-point-clamped (3L-NPC) inverter that is widely employed in solar photovoltaic energy conversion system. A silicon carbide (SiC) 3L-NPC inverter is developed in this paper by employing wide bandgap semiconductor power devices, such as SiC MOSFET and SiC diode (SiC D). These devices are used due to their superior characteristics over silicon (Si) semiconductor devices for the reduction of inverter power losses, and as a result, an improving efficiency at the high switching frequency. Accurate and detailed power loss calculation formula and power loss distribution over switching devices of the SiC 3L-NPC inverter are derived according to the modulation technique and inverter operation. The switching energy loss of SiC MOSFET is then measured and determined experimentally via inductive clamp double pulse test (DPT) at the real working condition of the circuit. Afterward, this experimental data is used in the thermal description file of the device’s library of PLECS simulation software to determine the total power loss of SiC 3L-NPC inverter. The developed simulation model replicates the real operating conditions of the 3L-NPC inverter. This method gives results close to the practical test. Finally, the power loss of SiC 3L-NPC inverter is measured and compared with the theoretical results. Furthermore, SiC MOSFET and SiC D are employed to achieve high system efficiency at the high switching frequency. The results verify the features of SiC 3L-NPC inverter, the corresponding modulation technique used and their effects on reducing and improving power loss in solar SiC photovoltaic inverters.
Performance of Variable Pitch Propeller for Longitudinal Control in an Agile Fixed-Wing UAV

This paper carries out a simulation based study on the performance of longitudinal control in an agile fixed-wing UAV with variable pitch propeller (VPP). Transition between cruise level flight at angle of attack (AOA)= 4°, and harrier level flight at AOA = 50° is implemented, on a variable pitch propeller design, in which the pitch of the propeller is actuated to change thrust, at constant rotations per minute (RPM). In a conventional design, the thrust is changed by varying RPM which is actuated by a Brush-less DC (BLDC)motor whereas in a VPP design, the propeller pitch is actuated by a servo motor which has faster response compared to a BLDC motor used in small UAVs. Hence the thrust change is achieved faster using variable pitch actuation. A longitudinal model of an agile fixed-wing UAV which includes propwash, wing downwash, flat plate post-stall aerodynamics and actuator constraints (first order dynamics, saturation and rate limit) is used in the work. The model of a variable pitch propeller is developed from the data of a particular propeller motor combination obtained from a software named QPROP. The longitudinal control used is a backstepping based nonlinear control. The simulation results are compared with that of a conventional design in which the same flight regime with the nonlinear control is implemented. The advantages of VPP based design are observed to be faster settling of velocity, AOA and pitch rate during transitions, very small altitude variation and reduction in maximum pitch rate during cruise to harrier transition. However, an increase in maximum pitch rate during harrier to cruise transition is a disadvantage. But overall, the simulation results shows that VPP design performs better than a conventional design for the above mentioned flight regime and indicates that a VPP based design of fixed-wing agile UAVs would be better for control in agile and high AOA maneuvers like perching, transition to hover and aggressive maneuvers. However, flight testing is essential to conclude this fully.