Miracle-dz/UniFAR-FTUs huggingface dataset:
Performance Evaluation of a Loop Thermosyphon-Based Heatsink for High-Power SiC-Based Converter Applications

Thermal management system (TMS) of a power converter directly dictates the available power rating, power density, semiconductor module reliability, and its operating lifetime. For the latest-generation wide bandgap (WBG) semiconductor device-based converters, it is challenging to extract the generated heat from the devices due to smaller die area as compared to its silicon (Si) counterparts. In this paper, the thermal performance of a new loop thermosiphon-based TMS for silicon carbide (SiC) semiconductor device-based power conversion system is presented. The working principle and design of the TMS are shown, and the performance of the designed TMS in both transient and steady-state conditions of power dissipation is evaluated. Furthermore, an accurate thermoelectrical model of the TMS is presented, and the circuit parameters are quantified by experimental results. This analysis helps to estimate the device junction temperature in real time during converter operation. Moreover, detailed simulations are carried out with the derived TMS thermal model to evaluate its performance at low fundamental frequencies at rated currents. The experimental results and the simulation studies indicate that the TMS offers a low thermal resistance and can extract a large amount of heat without increasing the device junction temperatures beyond their rated values. Furthermore, the designed TMS is able to maintain the junction temperature ripples at low fundamental frequencies within small values, which helps to increase the lifetime of the power modules significantly, as compared to conventional heatsinks.
Precise on-line non-target pose measurement for cylindrical components based on laser scanning

Purpose Cylindrical components are common in industry assembly areas. It is necessary to obtain their precise positions and orientations for their assemblies. But some measurement approaches relying on measuring targets are not allowed, as they may not meet the efficiency requirement of on-line measurement or may cause surface damages to the components. Thus, this paper aims to provide a precise on-line non-target scanning method based on 3D vision. Design/methodology/approach First, a laser profile sensor is used to acquire point cloud of the side surface of the measured cylindrical component. Then a composite process is conducted to estimate the pose and position of the axis. Aiming at this purpose, two fitting approaches, i.e., axis fitting and generatrix fitting, are tried respectively to estimate the pose parameters from the point cloud. Findings The results of Monte Carlo simulations demonstrate that neither the axis fitting nor the generatrix fitting could solely obtain the needed accuracy and precisions roundly. Thus, a new synthesis method is presented. And the results of prototype experiments validate the excellent accuracy and precision of the synthesis method. Originality/value This proposed new synthesis method combines the advantages of both the above fitting methods and can be easily integrated into the assembly line to guide the automation assembly process of the cylindrical components precisely.
Formal Analysis Method of Security Protocol

This paper researches on quick and efficient formal analysis of security protocol,and presents the concept of trust domain.Diagrammatic analysis is adopted,which makes deduction of protocol more clear and intuitive.This method analyzes the trust domain of protocol entity directly,which makes analysis easier.Experimental results show that the method is faster and more intuitive compared with traditional methods.It provides ways and basis for finding redundancies of security protocols.
Adaptive Edge-Preserving Smoothing and Detail Enhancement for H.263 and H.264 Video

For removing undesirable artifacts in video coding, a large number of filtering methods have been proposed as post-processing and in-loop processing. This chapter proposes a pre-processing method of motion-adaptive edge-preserving smoothing and detail enhancement for H.263 and H.264 video, in which temporal and spatial edges are used to define Region Of Interest (ROI). In the proposed pre-processing method, trilateral filtering with three types of weights (domain, range, and temporal weights) is used for smoothing non-ROI region while preserving temporal/spatial edges. In the proposed pre-processing method, the temporal weight preserves Adaptive Edge-Preserving Smoothing and Detail Enhancement
Surface acoustic wave pressure sensor and its matched antenna design

Interdigital transducer and signal transmission in surface acoustic wave pressure sensor design is one of the difficulties in sensor design. The transmission antenna is an important design indicator to determine the wireless function of the sensor. In this paper, we simulated the design of the interdigital transducer of surface acoustic wave pressure sensor through COMSOL and analyzed the relationship between the eigenfrequency of the single-pair interdigital model and the interdigital electrode. Then, we obtained the design of the interdigital electrode with error of 0.01 MHz. We also simulated the size, bandwidth, impedance matching, and other parameters of antenna through high frequency structure simulator, and a matching dipole transmission antenna was designed and miniaturized. When the bandwidth is satisfied, the control matching impedance error is within ± 1 Ω , and it is verified that the antenna satisfies the signal transmission requirement of the surface acoustic wave pressure sensor. This design provides a more comprehensive approach to the design of interdigital transducers and signal transmission for the field of surface acoustic wave measurement pressure.
Fatigue of Preloaded Bolted Connections with Injection Bolts

Abstract Injection bolts have been used to replace faulty rivets on strengthening operations of old riveted steel bridges. This technology has been essentially tested for its quasi-static or creep behaviour and there are very few studies concerned the assessment of its fatigue resistance. This paper presents an experimental program developed to evaluate the fatigue behaviour of single shear preloaded bolted connections with injection and standard bolts. Specimens combine S355 steel and old metallic material obtained from structural elements of the centenary Eiffel bridge in Portugal. Fatigue failure was found either at the net cross-section or at a gross cross-section of the plates. Statistical analysis was conducted on the experimental data to compare with the fatigue design curves proposed in Eurocode 3, part 1-9. It is concluded that the detail category suggested on the reference code is not able to represent the fatigue life of old steel materials. An alternative S-N curve is proposed which is able to represent the fatigue behaviour of the studied detail. Furthermore, it was concluded that the influence of the adhesive on the detail’s fatigue strength is not significant.
Contemplating social engineering studies and attack scenarios: A review study

The previous year has seen an enormous increase in the studies related to social engineering. This increase is partly due to increasing number of social engineering attacks and partly due to people's inability to identify the attack. Thus, it is of great importance to find solutions which are helpful for human to understand the social engineering attacks and scenarios. To address this, we have performed a literature review of studies (on social engineering) in top‐notch journals and conferences. In this paper, we have enlisted the types of attacks, and the persuasion techniques used by social engineers as listed in the literature. We also combined different theories which researchers tried to use to explain various activities of social engineers. Furthermore, we have mentioned that a better understanding of the social engineering attack scenarios can be done using thematic and game‐based analysis techniques. Preliminary empirical evaluation of the proposed game based method shows overall neutral results. Future extension and evaluation is needed for the proposed methods.
Experimental evaluation of vibration based damage identification techniques on a pedestrian bridge

Failures of civil structures, such as bridges, due to natural events or anthropic loads can generate significant social and economic impacts. As an alternative for the identification of damage in these structures, dynamic structural health monitoring has been proposed. This paper presents the experimental evaluation of three damage identification techniques on a full-scale footbridge. One of the evaluated techniques is based on damage localization vectors; a second technique is based on changes in the curvature of the modal shapes, while the third technique uses a numerical model and artificial neural networks for locating the damaged section. Five scenarios of controlled damage were induced in the footbridge. Output-only ambient vibration tests were performed at each damage state and the results of the identification techniques were analyzed. The three implemented techniques showed promising results for the numerical simulations, and two of these techniques produced satisfactory results in the experimental evaluation.
Filtennas for wireless application: A review

In recent year, various filtenna circuits have been developed satisfying the objectives and prerequisites of wireless communication. Some of these developed designs are new or some are the improved version of previous works whereas the others are the combination of conventional methods. This article presents the review of filtenna circuits starting from the beginning to the improvements until date. This article starts with brief overview of various filters with their design strategies and ends in its implementation in filtenna designs followed by discussion on several filtenna designs in term of size and overall performances. Among various designs, bandpass, and bandstop filters are extensively used in filtenna realization as it provides a better selectivity in desired band. Various planar filtenna circuits, based on either defected ground structure (DGS) or resonator or SIW filters are reviewed and presented. Besides, planar filtennas, these filters are also integrated to the aperture of horn antennas for the realization of horn filtennas, applicable for high frequency operations. It is observed that SIW based filtennas exhibited narrow impedance bandwidth. This feature can be improved by doubling substrate layer as well as the number of metallic ways. Whereas, resonator based filtennas use resonator based filters along with DGSs to enhance impedance bandwidth as well as minimize mutual coupling and cross‐polar radiation. Apart from single element filtenna, filtenna arrays, and reconfigurable filtennas (including planar and horn reconfigurable filtennas) are presented. This review article may be helpful for beginners working on filtenna circuits and also such a review process is not available in the open literature to the best of author's knowledge.
Pedestrian and Cyclist Detection and Intent Estimation for Autonomous Vehicles: A Survey

As autonomous vehicles become more common on the roads, their advancement draws on safety concerns for vulnerable road users, such as pedestrians and cyclists. This paper presents a review of recent developments in pedestrian and cyclist detection and intent estimation to increase the safety of autonomous vehicles, for both the driver and other road users. Understanding the intentions of the pedestrian/cyclist enables the self-driving vehicle to take actions to avoid incidents. To make this possible, development of methods/techniques, such as deep learning (DL), for the autonomous vehicle will be explored. For example, the development of pedestrian detection has been significantly advanced using DL approaches, such as; Fast Region-Convolutional Neural Network (R-CNN) , Faster R-CNN and Single Shot Detector (SSD). Although DL has been around for several decades, the hardware to realise the techniques have only recently become viable. Using these DL methods for pedestrian and cyclist detection and applying it for the tracking, motion modelling and pose estimation can allow for a successful and accurate method of intent estimation for the vulnerable road users. Although there has been a growth in research surrounding the study of pedestrian detection using vision-based approaches, further attention should include focus on cyclist detection. To further improve safety for these vulnerable road users (VRUs), approaches such as sensor fusion and intent estimation should be investigated.
A-Frame experimentation and evaluation for the development of interactive VR: a virtual tour of the Conimbriga Museum

This work provides an analysis of the development effort required to implement a Webbased VR experience using the A-Frame VR framework. We implemented an interactive 360o virtual tour of the Conimbriga Museum, featuring the objects of national interest that can be found in the museum’s exhibition. The tour allows navigation between the 360o scenes, providing information panels about the objects, and a floor menu for rapid teleporting between rooms. The implementation of this virtual tour allowed us to identify several issues where Web-based VR development is still lacking in flexibility.
Users' Distribution and Behavior in Academic Social Networking Sites

Academic social networking sites (SNSs) are growing rapidly. Worldwide, academicians use academic SNSs for many reasons regardless of their nation, gender, position, and discipline. In this paper, the authors extend their previous work in exploring the distribution and behavior of a particular academic SNS (academia.edu) on a large scale. The authors classify users into different groups based on their position, discipline, and continent. This study gives a better understanding of usage patterns in academic SNS, especially in the lack of large-scale studies about different classes of users on academic SNSs.
Influence of the Nonequilibrium Material State on Wear Resistance

The influence of the nonequilibrium state of a material on its wear resistance is investigated in this study. Using methods of non-equilibrium thermodynamics and the theory of self-organization, a non-equilibrium material is shown to possess an overall lower wear rate than a material in an equilibrium state. This was experimentally demonstrated to be the case in different materials and tribosystems, such as Babbit operating in complete lubrication conditions, copper in the current collector and a cutting tool with a coating applied on it.
Dead-Beat Control of Walking for a Torso-Actuated Rimless Wheel Using an Event-Based, Discrete, Linear Controller

In this paper, we present dead-beat control of a torsoactuated rimless wheel model. We compute the steady state walking gait using a Poincaré map. When disturbed, this walking gait takes a few steps to cancel the effect of the disturbance but our goal is to develop a faster response. To do this, we develop an event-based, linear, discrete controller designed to cancel the effect of the disturbance in a single step – a one-step dead-beat controller. The controller uses the measured deviation of the stance leg velocity at mid-stance to set the torso angle to get the wheel back to the limit cycle at the following step. We show that this linear controller can correct for a height disturbance up to 3% leg length. The same controller can be used to transition from one walking speed to another in a single step. We make the modelbased controller insensitive to modeling errors by adding a small integral term allowing the robot to walk blindly on a 7o uphill incline and tolerate a 30% added mass. Finally, we report preliminary progress on a hardware prototype based on the model.
The hard edge tacnode process and the hard edge Pearcey process with non-intersecting squared Bessel paths

A system of non-intersecting squared Bessel processes is considered which all start from one point and they all return to another point. Under the scaling of the starting and ending points when the macroscopic boundary of the paths touches the hard edge, a limiting critical process is described in the neighborhood of the touching point which we call the hard edge tacnode process. We derive its correlation kernel in an explicit new form which involves Airy type functions and operators that act on the direct sum of L2(ℝ+) and a finite-dimensional space. As the starting points of the squared Bessel paths are set to 0, a cusp in the boundary appears. The limiting process is described near the cusp and it is called the hard edge Pearcey process. We compute its multi-time correlation kernel which extends the existing formulas for the single-time kernel. Our pre-asymptotic correlation kernel involves the ratio of two Toeplitz determinants which are rewritten using a Borodin–Okounkov type formula.
PEP Analysis of AF Relay NOMA Systems Employing Order Statistics of Cascaded Channels

The precise error performance analysis is challenging for non-orthogonal multiple access (NOMA) systems due to nonlinear successive interference cancellation (SIC) processing among NOMA users. In this paper, the pairwise error probability (PEP) performance of different users is investigated for relay NOMA simultaneous wireless information and power transfer (SWIPT) systems. By employing the order statistics theory, we obtain the ordered probability density function of the cascaded channel through Source-to-Relay-to-User links. Then we derive the analytical closed-form PEP expressions for NOMA users. To obtain the approximate closed-form PEP, we explore the finite series representation of the power of the modified Bessel function to replace the integrand terms. Monte Carlo simulation results show that the approximate analytical PEP of each user is basically in agreement with the simulated PEP. Furthermore, on the basis of the closed-form PEP, the influence of relevant system parameters on the error performance is examined via numerical simulations, which manifests that the choice of power allocation coefficients should be balanced between the users’ channel conditions and the demanded quality of service.
Corrigendum: Resource adequacy in interdependent electricity markets undergoing heterogeneous expansion in renewable energy

In this study, the impact of the heterogeneous expansion of renewable energies on resource adequacy within interdependent electricity markets is investigated. The effect of increasing markets’ dependency on RA is also studied. A dynamic generation expansion model based on Benders decomposition is used to model the markets and coordinating entity to decompose the problem (keeping the markets independent in the master problem, and whole network constraints in the sub-problem). By using this method, the benders cuts are applied to the two different objective functions simultaneously. In a case study, the authors find that increasing markets’ dependency can postpone new unit installation time or decreases the need for new units in the market with more renewable resource but meanwhile the expected reserve margin stays at an acceptable level. According to the authors’ case study, the power plant's net present value increases by increasing markets’ dependency in the market with more renewable resources. The flexibility improves in both markets by increasing markets’ dependency.
The Strategies for Improving Energy Efficiency of Power System with Increasing Share of Wind Power in China

Coal-fired power generation will dominate the electricity supply in China in the foreseeable future. Coal fired power units can play a crucial role in integrating intermittent wind energy and improving the overall energy efficiency of the power system. The integration benefits of wind power, along with the gains of high load rates of coal fired units, should be fully taken into account. An optimal model combining wind power and coal fired units is built to analyze the operational flexibility of coal fired units and the integration of wind power. Taking the coal fired units in North China Power Grid as an example, the dispatch costs and benefits are examined under the energy efficiency dispatch mode, in comparison with those under the fair dispatch rules and the installed capacity. The results show that increasing the flexibility of the power system under the energy efficiency dispatch mode may be the best choice for the power system with the high share of coal fired units to integrate more wind power, and that the units delivering flexibility services are financially influenced. The results also indicate that a certain amount of wind power curtailment may be reasonable, and that rational penalty rate and fees for the curtailment of wind power may help to optimize the operation of the power system and integrate more wind power. Based on these results, policy and strategy recommendations are proposed to promote the flexibility of coal fired units and change their operation mode and their dispatch mode in the power system.
Improvement of NO2 Detection: Graphene Decorated With ZnO Nanoparticles

This paper describes the effect of graphene functionalizing with ZnO nanoparticles on the gas sensing properties. A straight microwave-assisted synthesis of the hybrid material was applied, which encompassed the mixing of graphene powder with ZnO nanoparticles and a microwave irradiation for a few minutes. The hybrid material was then collected with the hydro-alcoholic solution and drop casted onto a transducer. The tests carried out toward NO2 demonstrate the significant improvements of sensitivity and selectivity with respect to the bare graphene. This result was related to the synergistic effect of zinc oxides and graphene layers, and specifically on the increased surface area and a masking effect of the graphene sites responsible for slow responses.
On the Thermocapillary Migration at the Liquid and Solid Aspects

Thermocapillary migration is an interfacial phenomenon that describes liquid flow on a nonisothermal surface from warm to cold regions in the absence of external forces. It is a typical lubricant loss mechanism in tribosystems. To ensure continued reliability of lubricated assemblies, knowledge of the migration capacity of different liquids and solids is needed. In the present work, migration experiments were conducted on various liquid lubricants on different solid surfaces. It was found that polar lubricants such as ionic liquids and polyethylene glycol hardly migrate on the tested surfaces, and the antimigration capacity of the polytetrafluoroethylene surface was discovered to be very high. Particular attention is paid to the migration mechanism associated with surface tension and contact angle. General guidelines for evaluating the migration capacities of different liquids on solids are proposed.