Miracle-dz/UniFAR-FTUs huggingface dataset:
System design for active vibration control of aerospace structures

Instrumentation, electronics, digital signal processing and related software form the basic building blocks of a system for implementation of Active Vibration Control (AVC) for smart aerospace structures. This paper essentially deals with the design, development and implementation of a 4 channel analog input sub-system essentially consisting of charge amplifiers, filters, gain amplifiers & Analog to Digital Converters (ADC), the subsequent Digital Signal Processor (DSP) hardware for implementation of the controller and finally a 4 Channel analog output subsystem consisting of Digital to Analog Converters (DAC), reconstruction filters & high voltage amplifiers. This system essentially interfaces to a structure with piezo-ceramic sensors and actuators for implementation of real time AVC on a smart beam. The paper also highlights some of the new ideas that have been incorporated into the system design.
Trusted Software Construction Model Based on Trust Shell

Due to not considering the guaranty of trustiness, traditional software development methods and techniques lack effective measures for ensuring trustiness. Combining agent technique with trusted computing provided by TPM, a trusted software construction model based on Trust Shell (TSCMTS) is demonstrated in this paper, where Trust Shell is responsible for ensuring the trustiness of software logically. In particular, for the purpose of improving the accuracy of trustiness constraints, a strategy of determining multiple attributes’ weights by information entropy for check point is proposed. Both simulation experiment results and practical application indicate that the TSCMTS is of effective trustiness and reasonable performance overhead.
Longitudinal junction termination technique by multiple floating buried-layers for LDMOST

The longitudinal junction termination technique by multiple floating buried-layers for the lateral double-diffused MOSFET (LDMOST) is presented. In off-state, the space charges in the buried-layers generate a new electric field, and this field reduces the electric field peak at the main junction. The potential contours distribute more uniformly than those of the conventional LDMOST. Simulation results show that the breakdown voltage of the proposed structure is 1776 V, compared to 841 V of the conventional LDMOST with the same 120 µm drift length.
Novel approaches towards more ’real-life’ listening experiments in complex acoustic scenes

In real-life listening situations, we often listen to speech inside rooms with different room acoustics conditions and in the presence of masking noise. Most everyday listening situations consist not only of direct sound from multiple sound sources, but also numerous reflections reaching our ears caused by the physical environment. These listening situations are challenging for adults as well as especially for children. Acoustic environments in educational institutions (schools and kindergarten) are usually highly complex and noisy, hence it is demanding to identify relevant target speakers and to ignore irrelevant sounds. Two approaches will be presented to include more real-life aspects of listening situations in complex acoustic scenes. The first approach is a speech-in-noise test, investigating effects of a moving masker including room acoustic effects in young and elderly listeners. The second approach is an auditory selective attention paradigm, which has been evaluated with adults, both in dichotic and binaural listening environments. To also meet the needs of children, the auditory selective attention paradigm was adapted and validated with children. In this talk, we will highlight important (binaural) features in the transformation of experiments from simple instances of audio reproductions towards more life-like listening situations.
Experimental Investigation on Damping Characteristics of Blade With Loosely Assembled Dovetail Attachment

The damping characteristics of blade with loosely assembled dovetail attachment are investigated experimentally. An experimental method and a test rig were presented to study the blade damping characteristics. In the measurement system, an external force is imposed on blade, to simulate the centrifugal force of blade. The dynamic responses of a group of simulation blades with different dovetail attachment angles were measured in consideration of variable simulation centrifugal force. The damping characteristics of a compressor blade with dovetail attachment were measured too. Some conclusions can be drawn from the experimental results. The resonant frequency increases with the centrifugal force, gradually reaches a certain value. The amplitude of resonant response decreases at the beginning and then increases with the centrifugal force increasing, there exists a special centrifugal force on which the effect of dry friction damping is the best. The change rate of the blade response in the range of neighboring optimal centrifugal force is obviously influenced by the dovetail angle. From the results of the last stage blade of compressor, we can find that the resonant amplitude retains a low level when the centrifugal force is from 1.5kN to 4kN.Copyright © 2010 by ASME
The Effect of Disruptions on the Hotel Industry: a Case Study on COVID-19's Effect on Hilton Worldwide

COVID-19 had a large impact on the global economy, including the global tourism industry, which had to adapt due to travel restrictions and health concerns among consumers. This study aims to find how the hotel industry adapts in response to the changing customer segments and customer demands in response to a disruption. In particular, it offers a case study of the response of Hilton Worldwide to COVID-19. The research finds the strategy of Hilton Worldwide changed from growth focus to cost management, causing a more centralized governance structure. Moreover, Hilton Worldwide has put the Hilton Honors App in the spotlight, which can offer a fully digitalized and contactless check-in procedure. This research analyses this via a BPMN model. To cope with the loss of business travelers, a new business model for Hilton is proposed; renting out rooms as workplaces. However, this imposes new cyber risks such as; key Bluetooth signal interception, key interception when shared, a data leak and unauthorized access to Hilton Honors account. Finally, the findings are discussed in light of the pre-COVID-19 business strategy of Hilton Worldwide to identify opportunities and threats in the new strategy.
GNSS/RFID Active Transponder Design

The paper describes a design of global navigation satellite system (GNSS)/Radio frequency identification (RFID) active transponder which is primarily designed for localization of objects as a part of localization system designated for efficient handling of situations with mass casualties. The precise localization is improved by differential GNSS. The block diagram of such GNSS/RFID active transponder is described including main operation procedures of the firmware. Measurement of the localization by algorithms of RTKLIB library and by algorithms of GNSS module is compared. Dynamic tests, i.e. GNSS/RFID active transponder placed in the moving car (50~kmph), and static tests, i.e. GNSS/RFID active transponder placed in the position for 15~min, are performed.
The Research on Innovation Experimental Area of E-commerce Talents Cultivation Model

The innovation of E-commerce talents cultivation model is the emphasis of modern pedagogy, also is one of significant research subject about higher education research in National and Guangdong Province Medium to Long-term Development Plan and The Outline of 12 th Five-Year Development. Through carrying out "Inverted Classroom" model in E-commerce practical teaching research based on quality educational resources and "Ali ecological system", this paper realizes the innovation of E-commerce talents cultivation model. Establishing stimulating mechanism of practical teaching innovation capability, guiding mechanism of self-directed learning and cultivating mechanism of entrepreneurship ability. Simultaneously, carrying out the scientificity, feasibility, and advancement in E-commerce practical teaching clearly based on quality educational resources in Internet.
Facultative associations of two sympatric lycaenid butterflies with Camponotus compressus – field study and larval surface ultrastructure

The present study focused on the associations of two sympatric lycaenid species, Chilades pandava Horsfield, 1829 and Euchrysops cnejus Fabricius, 1798 with their respective host plants and the lycaenid tending Camponotus compressus Fabricius, 1787 ants by conduction of field studies and by examination of the ultrastructure of the larval myrmecophilous organs. The study revealed two facultative association complexes: ants - the defoliating Cl. pandava larvae - Cycas revoluta (Thunb.) plants and ants - the pod-boring E. cnejus larvae - cowpea plant, Vigna unguiculata (L.) Walp. The association of Cl. pandava was strongly synchronized with its host plant phenology and relatively less strongly with its late-arriving ant partner since the young, curled up leaves provided resources only to the caterpillars. The provision of resources to both the ants and the lycaenids by the cowpea plants contributed to the synchronization of E. cnejus association with the early arriving ants as well as the host plant . Presence of a single type of setae in Cl. pandava and of two types of setae in E. cnejus larvae indicates their facultative adaptations for resisting attack by their host ants. Ultrastructural similarity in the dorsal nectary, pore cupola and tentacle organs suggest that the basic myrmecophilous organs are conserved in these two lycaenid species.
Suitability of hydraulic disk brakes for passive actuation of upper-extremity rehabilitation exoskeleton

Passive, energy-dissipating actuators are promising for force-coordination training in stroke rehabilitation, as they are inherently safe and have a high torque-to-weight ratio. The goal of this study is to determine if hydraulic disk brakes are suitable to actuate an upper-extremity exoskeleton, for application in rehabilitation settings. Passive actuation with friction brakes has direct implications for joint control. Braking is always opposite to the movement direction. During standstill, the measured torque is equal to the torque applied by the human. During rotations, it is equal to the brake torque. Actively assisting movement is not possible, nor are energy-requiring virtual environments. The evaluated disk brake has a 20 Nm bandwidth flat-spectrum, multi-sine of 10 Hz; sufficient for torques required for conventional therapy and simple, passive virtual environments. The maximum static output torque is 120 Nm, sufficient for isometric training of the upper extremity. The minimal impedance is close zero, with only the inertia of the device felt. In conclusion, hydraulic disk brakes are suitable for rehabilitation devices.
Laser spot tracking with sub-pixel precision based on subdivision mesh

As high brightness of laser spot, it significantly distinguish from the other goals on objects surface. Therefore, in computer vision, laser spot often is applied as interaction tools, and an important measurement tool etc. In building large-scale multi-projection display system, accurate measurement of geometrical parameters is very important. Based on subdivision mesh, this paper presents laser spot tracking algorithm with sub-pixel precision. The experimental data validates this algorithm sub-pixel precision.
Segmented battery charger for high energy 28 V lithium ion battery

Since they were first introduced in the early 1990s, lithium ion batteries have enjoyed unprecedented growth and success in the consumer marketplace. Combining excellent performance with affordability, they have become the product of choice for portable computers and cellular phones. Building on the same energy and life cycle attributes, which marked their consumer market success, but adding new high power storage capability, lithium ion technology is now poised to play a similar role in the transportation, military, and space sectors. With major programs in various aspects of electric and hybrid electric vehicles, Saft has developed a family of battery products which address the power and energy storage where light weight, long life, and excellent energy or power storage capabilities are needed. Significant progress in the packaging and control of high power, yet compact, batteries has been accomplished for a variety of vehicle applications. This paper discusses the charger and balancing strategies of one of this family of products.
Second-order compensated bandgap reference with convex correction

A correction technique for second-order temperature variation of bandgap voltage references (BGR) is presented. It consists of adding a convex curve with a simple circuit to the standard bell curve of a first-order BGR. The temperature coefficient of the new BGR is as low as 1 ppm//spl deg/C.
Damage localization in composite laminates based on a quantitative expression of anisotropic wavefront

In this paper, according to the disperse curve of composite laminates in a low frequency domain, a quantitative relation between anisotropic wavefront and propagation direction is proposed to reveal the direction dependency of Lamb wave propagation in composite laminates. This relation is described by a concise analytic expression, which can effectively incorporate anisotropic wave propagation into damage identification and reasonably determine the time-of-flight (ToF) of the Lamb wave. The reliability and applicability of this quantitative relation are validated by numerical simulations and experiments in three different lay-up composite laminates. Furthermore, combining this quantitative relation and the conventional ToF approach, an effective detection method is developed for damage localization in composite plate-like structures. By using PZT sensors, the method is conducted experimentally in a cross-ply laminate. The Gabor wavelet transform is introduced for signal processing to identify the ToF more exactly. Results indicate that a satisfied damage location can be achieved by considering the orientation dependency of anisotropic wave propagation in composite laminates.
The Assessment of the Efficiency of the Sustainable Development Policy in the Category of Economic Order across Polish Provinces

A comparative analysis of sustainable development in the category of economic order at the regional level has been carried out. A comparison of the level of implementation of the guidelines for economic order in Polish provinces has been made. The following research questions were formulated: Q1: What are the methods to apply in order to assess the level of sustainable development in the light of the plethora of the strategic goals of sustainable development and the implementation indicators of these goals; Q2: Do Polish provinces implement the assumptions of the sustainable development strategy with comparable efficiency. The following hypotheses were formulated: H1: The objects under research show significant differences in terms of the taxonomic distances between the synthetic measure of development which confirms the validity of applying the multidimensional analysis for measuring the levels of sustainable development; H2: Polish provinces differ significantly in terms of the level of sustainable development in the category of economic order. The aim of this article is to objectively measure the progress in the implementation of the goals of the sustainable development strategy in the category of economic order by Polish provinces. In order to meet the formulated goal, a synthetic measure was built with a view to defining the implementation level of the goals formulated in the sustainable development strategy in the category of economic order.
Interaction of DC-DC converters and submarine power cables in offshore wind farm DC networks

i Declaration . ii Acknowledgements . iii List of Abbreviations. iv List of Symbols . vi Table of Contents . ix List of Figures . xvi List of Tables. xxiv 1 Introduction . 1 1.1 UK and Crown Estate Strategy for Offshore Wind . 1 1.2 Choice and Description of Research Topic. 3 1.3 Project Philosophy and Contribution to Knowledge. 4 1.4 Validation and Verification. 5 1.5 Thesis Outline . 7 2 Offshore Wind Farms and Electrical Systems . 9 2.1 Offshore Wind Power and Costs. 9 2.1.1 Overview. 9 2.1.2 Offshore Wind Turbines and Wind Farms. 10 2.1.3 Repair and Maintenance. 10 2.1.4 The Offshore Environment . 11 2.2 AC Transmission and Limitations . 11 2.3 HVDC Conversion . 13 2.3. 1 State of the Art HVDC Converters . 13
Characterisation of electromagnetic properties in iron-mine production tunnels

Modern underground mines require reliable wireless communication for transmitting voice data, operating surveillance cameras, and monitoring mining equipment such as heavy vehicles. The electromagnetic characteristics of mines therefore have to be considered when determining the type of wireless technology for such critical applications. In this reported work, measurements of radio interference levels, path loss, and multipath propagation are performed in the world's now largest iron ore mine, situated in Sweden, to determine a suitable wireless technology for this mine.
Spatial Controls of Ligamentous Tissue Orientations Using the Additively Manufactured Platforms in an In Vivo Model: A Pilot Study

The periodontal ligaments (PDLs) with specific orientations to tooth-root surfaces play a key role in generating biomechanical responses between the alveolar bone and cementum as a tooth-supporting tissue. However, control of angulations and regeneration of the ligamentous tissues within micron-scaled interfaces remains challenging. To overcome this limitation, this study investigated surface fabrications with microgroove patterns to control orientations of rat PDL cells in vitro and fibrous tissues in vivo. After being harvested, rat PDL cells were cultured and three different microgroove patterns (∠PDL groove = 0°, ∠PDL groove = 45°, and ∠PDL groove = 90°) were created by the digital slicing step in 3D printing. Cell-seeded scaffolds were subcutaneously transplanted at 3 and 6 weeks. In histology images, rat PDL cells were spatially controlled to angularly organize following the microgroove patterns and fibrous tissues were formed in scaffolds with specific angulations, which were reflected by additively manufactured microgroove topographies. Based on the results, specifically characterized surface topographies were significant to directly/indirectly organizing rat PDL cell alignments and fibrous tissue orientations. Therefore, interactions between surface topographies and tissue organizations could be one of the key moderators for the multiple tissue complex (bone-ligament-cementum) neogenesis in periodontal tissue engineering.
Polarization Power Correlation Function-Based Nonlinearity Monitoring in PM-16QAM Coherent Optical Fiber Transmission Systems

A fiber nonlinearity monitoring method based on polarization power correlation function is proposed. Numerical results show 1.0 dB maximum estimation error of nonlinearity power in 224Gbps PM-16QAM system with $800 \sim 2800 {\mathrm km}$ transmission length. © 2021 The Author(s)
FLOW RATE BASED PREDICTION OF THRESHING PROCESS IN COMBINE HARVESTERS

The threshing section affects grain separation performance in combine harvesters. Proper configuration is critical to ensure an optimal economic working of combine harvesters. Predicting grain separation online is essential for an automatic machine tuning system. An indirect process–monitoring device was designed based upon feedrate measurements. Stationary tests provided information about the behavior of grain separation during the threshing process as a function of different feedrates and crop properties. Six different theoretical threshing models were analyzed. For three models, a comparative study has been carried out to choose an optimal predictor of the separation process. The most accurate prediction model is based on Rusanov’s exponential model. The confidence interval necessary to analyze the residual value of the predictor was calculated for each predicted separation curve.
Fabrication and testing of all solid-state microscale lithium batteries for microspacecraft applications

A microfabrication process has been developed to prepare thin film solid-state lithium batteries as small as 50 μm × 50 μm. Individual cells operate nominally at 3.9 V with 10 μA h cm−2 for a 0.25 μm thick cathode film. The cells are easily fabricated in series and parallel arrangement to yield batteries with higher voltage and/or capacity. Multiple charge/ discharge cycles are possible, though an apparent reaction of the in situ plated Li film with water or oxygen decreases cycle life several orders of magnitude from expected results. Further optimization of an encapsulating film will likely extend the cell cyclability. These microbattery arrays will be useful for providing on-chip power for low current, high voltage applications for microspacecraft and other miniaturized systems.
An Improved Driving Circuit with TIP41C and TIP42C Transistors to Speed Up Operation of PCB Machine

This paper presents design of a new driving circuit for the PCB machine in use at our Control and Instrumentation Lab. The new driving circuit is constructed with TIP41C and TIP42C transistors in order to overcome speed limitation of the previously developed relay based driving circuit. The improved driving circuit successfully operated the PCB machine and speeded up its operation by almost 4 times. Along with an image processing algorithm we have also developed during this study, the PCB machine is now able to get schematic file of a circuit as an input and perform complete trace line drawing and hole drilling of the schematic onto a PCB card with almost no human intervention in between. An example PCB card processed by the machine is demonstrated at the end of the paper. Streszczenie. W artykule opisano projekt nowego ukladu sterowania dla maszyny PCB. Nowy obwod, oparty na tranzystorach TIP41C oraz TIP42C, eliminuje ograniczenia szybkości, wystepujące w poprzednio zaprojektowanych systemie. Zbudowany system zapewnia wysoki stopien automatyzacji, w wiekszości eliminując dzialania czlowieka. (Ulepszony uklad sterowania maszyny PCB dla zwiekszenia szybkości pracy, oparty na tranzystorach TIP41C i TIP42C).
Design considerations for single-stage electronic ballast with dimming feature

Design considerations for single-stage electronic ballast with a dimming feature are presented in this paper. When the lamps are dimmed out to a lower light level, the density of electrons will drop significantly, which would result in visible striation. Moreover, power imbalance exists between the power factor correction semistage and the ballast semistage, which usually results in a high DC-link voltage and might damage the switching devices. Strategies for suppressing the high DC-link voltage and eliminating the effect of striations occurring in a fluorescent lamp are therefore proposed. In addition, an improvement on the jump phenomenon of lamp luminous output when it is controlled by varying the switching frequency is also proposed. Hardware measurements have been presented to verify the theoretical discussions.
Prediction of Natural Image Saliency for Synthetic Images

Numerous saliency models are being developed with the use of neural networks and are capable of combining various features and predicting the saliency values with great results. In fact, it might be di ﬃ cult to replace the possibilities of artiﬁcial intelligence applied to algorithms responsible for predicting saliency. However, the low-level features are still important and should not be removed completely from new saliency models. This work shows that carefully chosen and integrated features, including a deep learning based one, can be used for saliency prediction. The integration is obtained by using Multiple Kernel Learning. This solution is quite e ﬀ ective, as compared to a few other models tested on the same dataset.