Miracle-dz/UniFAR-FTUs huggingface dataset:
Uniplanar coupled‐fed printed PIFA for WWAN operation in the laptop computer

In this article, a uniplanar printed PIFA (planar inverted‐F antenna) with a coupling feed for application as an internal laptop computer antenna for penta‐band WWAN (wireless wide area network) operation is presented. The proposed PIFA has a compact structure and can be easily printed on one side of a small 0.8‐mm thick FR4 substrate of size 11 × 59 mm2, making it very promising to be embedded inside the casing of the laptop computer, especially for the thin‐profile laptop computer. With the coplanar coupling feed, the large inductive input reactance of the PIFA at around 900 MHz is compensated, and dual‐resonance excitation for the antenna's lower band at about 900 MHz is obtained, which allows it to easily cover GSM850/900 operation. A wide operating band is also achieved for the antenna's upper band at about 1900 MHz, and a bandwidth of larger than 500 MHz is obtained to cover GSM1800/1900/UMTS operation. That is, the proposed PIFA covers all the five operating bands of GSM850/900/1800/1900/UMTS for WWAN operation. Details of the proposed PIFA are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 549–554, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24084
Predictors of MS/OR Application in Small Businesses

Today, applying MS/OR methods usually requires the use of computers. A company may not be ready to implement MS/OR techniques unless it has allocated adequate resources to information systems and has basic transaction-oriented systems in place. We considered nine characteristics of firms and their information systems use as indicators of organizational readiness for MS/OR use. We analyzed survey data collected from 495 technology-oriented small businesses and found that the adoption of MS/OR techniques is more likely to occur if a firm uses information technology to support many of its basic transaction-oriented operations and has a large number of employees.
Dynamic Stall: The Case of the Vertical Axis Wind Turbine

This paper presents the results of an experimental investigation on a driven Darrieus turbine rotating at different tip speed ratios. For a Reynolds number of 3.8 x 10/sup 4/, the results indicate the presence of dynamic stall at tip speed ratio less than 4, and that helicopter blade aerodynamics can be used in order to explain some aspects of the phenomenon. It was observed that in deep stall conditions, a vortex is formed at the leading edge; this vortex moves over the airfoil surface with 1/3 of the airfoil speed and then is shed at the trailing edge. After its shedding, the vortex can interact with the airfoil surface as the blade passes downstream.
Dynamic and distributed Infield-Planning System for Harvesting

Abstract. In agriculture, one has always been working on organizing the processes more efficiently, cost-effectively, and resource-efficiently. Increasing the machineâ€™s efficiency alone provides only limited improvement to the overall productivity. Further improvements can be achieved when the various machines plan their processes on the field together and cooperate with one another. This paper describes a dynamic distributed infield planning system for the grain harvest. In particular, it focuses on the underlying target system and the dynamic route planning.
Multimode nature of quadruple-clad fibres

The quadruple-clad fibres are intrinsically multimode structures because both the LP01 and LP02 modes propagate. From experiment and theory, the ‘cladding’ part of the profile is seen to support the LP11 and possibly also the LP21 modes in the usual 1.2–1.7 μm wavelength interval.
4H-SiC high power SIJFET module

5kV high power full SiC module technology was developed and 1.6kV 40A SIJFET module was fabricated for the first time, which is the pressure contact flat package type and includes four 6mm /spl times/ 6mm SiC SIJFETs in addition to one 6mm /spl times/ 6mm SiC fly wheeling pn diode. SiC SIJFET operates as the bipolar transistor and its current gain ranges from 20 to 4000. Its turn-on time and turn-off time are 360ns and 109 ns respectively. Since the SIJFET module has not only high current gains but also high switching speeds, it is suitable for the low loss power conversion circuits.
Socio-Economic Indexes for Water Use in Irrigation in a Representative Basin of the Tropical Semiarid Region

Performance evaluation of irrigated agriculture is an important tool that assists in decision-making on water management in the river basin, particularly in tropical semiarid regions. This study was carried out using information from the Jaguaribe River basin, located in the Northeast region of Brazil, which has an important restriction in the availability of water resources and high competition for water use. From a set of indicators (production, water, economic, and social), the overall performance index of irrigated agriculture was estimated (ranging from zero to 1.0) for two scenarios: high water scarcity and low water scarcity. The performance index used was based on the mean value of these security criteria normalized with respect to the maximum value of the indicator for the crop obtained in the sub-basin. A low performance index of irrigated agriculture (less than 0.3) has always been associated with inadequacy of more than one security indicator. Crops with significant cultivated areas and, therefore, requiring a high volume of irrigation, such as rice, sugar cane, banana, and green coconut, require technical interventions related to the management of the soil–water–plant system aiming at improving yield with less water. Under conditions of water restrictions, crops with performance indexes higher than 0.3 should be prioritized. The study presented here for Jaguaribe River basin may support public policies related to irrigation and agronomic techniques necessary to improve the performance of agricultural under tropical dry lands.
Nondestructive Determination of Chromium, Nickel, and Zinc in Neem Leaves and Facial Care Products by Laser Induced Breakdown Spectroscopy (LIBS)

Abstract Laser-induced breakdown spectroscopy (LIBS) was employed to determine Cr, Ni, and Zn in Neem-based beauty soaps and Neem leaves. The measurements were accomplished by attaining the optically thin plasma under the condition of local thermodynamic equilibrium (LTE) using standard calibration curve (SCC)-LIBS. The detection system was calibrated for these elements. The results showed 5.0 to 12 ppm by mass of nickel and 9.0 to 16 ppm by mass of chromium, which are above the secure allowed levels of these elements. Similarly, zinc was present from 6.2 to 14 ppm. The relative accuracy of LIBS was compared to inductively coupled plasma – optical emission spectrometry (ICP-OES) was from 0.1 to 0.3 with 2.5% error confidence.
Decoding Arm Movements by Myoelectric Signal and Artificial Neural Networks

The scientific researches in the field of rehabilitation engineering are increasingly providing mechanisms in order to help people with disability to perform simple tasks of day-to-day. Several studies have been carried out highlighting the advantages of using muscle signal in order to control rehabilitation devices, such as experimental prostheses. This paper presents a study investigating the use of forearm surface electromyography (sEMG) signals for classification of several movements of the arm using just three pairs of surface electrodes located in strategic places. The classification is done by an artificial neural network to process signal features to recognize performed movements. The average accuracy reached for the classification of six different movements was 68% - 88%.
Robust Vibration Control of a Cantilever Beam Using Self-Sensign Actuator

The self-sensing actuator is a new concept for intelligent materials, where a single piezoelectric element simultaneously functions as both a sensor and an actuator. This concept should be advantageous in many aspects of control, especially for vibration control of flexible structures. The key component of this device is an electric bridge circuit that includes a piezoelement. This circuit could provide significant information about strain in the element if it were wellbalanced. Our aim is to use μ-synthesis to design a controller which guarantees that the performance of a self-sensing actuator is robust against perturbations in the bridge balance and to confirm the advantages of this technique from the viewpoint of control. Experimental results show that the self-sensing actuator driven by the designed controller exhibits excellent performance in suppressing the vibration of a cantilever and is robust compared to the conventional control scheme.
Dual-band slot-loaded patch antenna

A new patch antenna is analysed which provides dual-frequency operation by means of two narrow slots close to the patch radiating edges. The two modes of operations show similar radiating properties. The ratio between the two frequencies can be well controlled within a range varying from 1.6 to 2, by using simple semi-empirical formulas derived from a physical model and tested by using a fullwave analysis. To obtain a more extended range of this frequency ratio, two tuning microstrip stubs are introduced on a back substrate. Satisfactory performances of simultaneous matching when using a single feed point is demonstrated. Several measurements are shown for both the input impedance and the radiation pattern.
Application of the particle in a box electronic circuit in a spread spectrum communication system

A spread spectrum communication system based on the electronic model of the particle in a box system is proposed. This electronic system allows a robust and simple electronic emulation of the mechanical behaviour of the collisions of a particle inside a box, exhibiting rich chaotic behaviour. The required non-linearity to emulate the box walls is implemented in a simple way when compared with other analogue electronic chaotic circuits. In this system, a stream of binary data is transformed in the frequency modulated signal by the binary frequency shift keying (BFSK) modulator. The chaotic signal of the particle in a box electronic circuit is used to generate a broadband signal in the voltage controlled oscillator (VCO) of the transmitter. The frequency hopping signal sent to receiver is generated by mixing the binary frequency shift keying and the broadband signal. The demodulation process is done when the VCOs of transmitter and receiver are synchronised by a phase locked loop (PLL) circuit. The performance of the demodulation process is verified through the eye pattern technique applied on the recovered bit stream. A binary data stream was sent through a transmission channel with the following lengths: 2,000 metres and 8,000 metres. The experimental results demonstrated that the particle in a box electronic circuit can be used in a spread spectrum communication system.
A numerical modelling of microdischarge threshold in uniform electric fields

This paper deals with the novel idea of controlling the electric stress in a hybrid air–solid dielectric insulation. In a parallel-plate electrode system, the electric stress can be reduced if the electrodes are covered with thick non-conducting dielectric coatings. Free charges are generated by microdischarges developing between the electrodes and are deposited at the dielectric surfaces. As a consequence, a counteracting electric field component results, which causes a reduction of the electric field in the air gap and an enhancement of the field in the dielectric coatings; i.e. the electric stress is forced into the dielectric coatings by the charges. A computation of the threshold voltage of the microdischarges is presented. The charge simulation technique is used for field calculation, irrespective of the thickness of the dielectric layer and the values of the charges deposited on the dielectric surfaces. The calculated threshold voltages are compared with those estimated before analytically and those measured for different gap lengths.
Effect of geographical location, insect type and cooking method on the nutritional composition of insects consumed in South Africa

Edible insects may be a sustainable source of protein and some other nutrients, especially for low-economic-status communities. The current study determined the influence of insect type, geographic location, and cooking method on the nutritional composition of insects. The investigation would contribute to the maximal derivation of the nutritional benefits of insects. Dried samples of four insect types, G. belina (mopani worm), Gynanisa caterpillar, termite soldiers/workers, and termite alates, were procured from different street vendors across Vhembe district in Limpopo Province, South Africa. G. belina samples were cooked by frying, boiling with and without salt addition. Generally, nutrient content varied significantly with insect type and geographic location (p<0.05). Protein content varied from 40 g/100 g in termite alates to 69.75 g/100 g in termite soldiers/workers. Termite soldiers/workers had the highest iron content (range: 545-629.5 mg/kg), whilst Gynanisa caterpillar had the highest zinc content (range: 122.14-150.33 mg/kg). Similarly, Gynanisa caterpillar had the highest levels of lysine (range: 0.80-4.53 g/100g), threonine (range: 0.79-2.64 g/100g) and isoleucine (range: 0.63-2.33). On the other hand termite soldiers/workers had the highest levels of valine (range: 2.20-3.47 g/100g), leucine (range: 2.49-3.87 g/100g) and phenylalanine (range: 1.38-3.55 g/100g). Cooking method significantly affected nutrient retention. Boiling with salt added resulted in the highest retention of protein and total mineral content (ash), and, therefore, seems a suitable method for cooking insects. The findings indicate that, if optimally selected and cooked, edible insects can contribute significantly to the alleviation of protein, zinc, and iron deficiencies in target communities.
Non-Lane-Based Car-Following Model with Visual Angle Information

Car-following theory is of significance in microscopic traffic flow theory. The key assumption of current car-following theory is that vehicles travel in the middle of a single lane. However, this assumption is unrealistic and cannot describe driving behavior in a complex traffic environment. When the lateral separation characteristics between the follower and the leader are taken into account, the time-to-collision equation is modified with visual angle information and introduced into the General Motors model. A non-lane-based model of car following was developed; it uses time to collision and is based on the stimulus–response framework. The proposed model was investigated with simulations conducted under several driving scenarios. The model could describe local and asymptotic stabilities, lateral movement, and the effect of neighboring vehicles. Results implied that this staggered car-following model incorporating lateral separation greatly enhanced the realism of car-following behavior.
Plataforma para Gestão de Identidades Descentralizadas Baseada em Blockchain

A identidade é fundamental para o reconhecimento das entidades (indivíduos, coisas e organizações) e das suas diversas relações no contexto em que estão inseridas. A gestão de identidades (GId) estabelece procedimentos de autenticação, autorização, responsabilização e auditoria, de forma a preservar a segurança do acesso aos recursos das organizações. Até então centralizados ou federados, os sistemas de GId podem evoluir para um modelo descentralizado e autossoberano (IDD), no qual o próprio usuário passa a ser o administrador das informações sobre sua identidade, e esta, inclusive, passa a ser única e compartilhável em todo o ecossistema. Este trabalho apresenta a ChainID, uma plataforma para gestão de identidades descentralizadas através da blockchain, que contempla a GId, seus atributos e credenciais, e é suficientemente genérica para abstrair a complexidade dos padrões e protocolos de comunicação envolvidos, proporcionando assim o uso da infraestrutura de IDD em diversos fluxos de oferta de serviços, de forma segura e transparente. Como prova de conceito da plataforma, foi desenvolvido o componente de autenticação da ChainID, que beneficia redes federadas, como a CAFe da RNP.
An integrated approach to electronic waste (WEEE) recycling

Purpose – This paper aims to present a review carried out under DEFRA‐funded project WRT208, describing: the composition of WEEE, current treatment technologies, emerging technologies and research.Design/methodology/approach – This paper summarises the output from the first part of the project. It provides information on the composition of WEEE and an extensive survey of technologies relevant to materials recycling from WEEE. A series of further papers will be published from this research project.Findings – WEEE has been identified as one of the fastest growing sources of waste in the EU, and is estimated to be increasing by 16‐28 per cent every five years. Within each sector a complex set of heterogeneous secondary wastes is created. Although treatment requirements are complicated, the sources from any one sector possess many common characteristics. However, there exist huge variations in the nature of electronic wastes between sectors, and treatment regimes appropriate for one cannot be readily transfer.
Pulse compression acoustic microscopy at 750 MHz

A pulse compression acoustic microscope working at a centre frequency of 750 MHz is reported. The pulse expansion and compression is achieved by SAW dispersive delay lines. The transmitted chirp has a bandwidth of 150 MHz and a dispersion of 1 MHz/ns. A processing gain in excess of 10 dB has been achieved.
CMOS analogue adder

A CMOS analogue circuit is proposed that computes the sum of two voltages. The circuit is self-biased, only requires a small number of transistors, and offers good accuracy over a wide range of input values. The design makes no special demands on device aspect ratios and could offer an economic alternative to conventional approaches. Simulation results have shown that total harmonic distortion (THD) is lower than –40 dB for output voltages up to 4 V peak to peak.
Is Modern Monetary Theory’s prescription to spend without reference to tax receipts an invitation to tyranny?

A set of policy prescriptions based on Modern Monetary Theory (MMT) have been developed that are independent of the monetary model, which are often presented together, in a context that does not require taxation: guaranteed income, job guarantee and full employment. These are enabled by the ability of a government to deficit spend as needed, as long as government controls its sovereign currency. Here I raise the concern that implementing MMT accounting could cause increases in political power inequality relative to citizens not seen since the medieval era or before. The assumption that spending and tax policy in an MMT system would occur as proponents expect is contradicted by the history of political choices regarding spending and taxation over the past half-century. The record of behaviour by politicians in the nations where foreign aid money “fell from the sky,” thus divorcing national income from the tax base, also contradicts this idea. With removal of the formal requirement for taxation, politicians operating in an MMT system will have little inherent reason in the short term to treat citizens well except moral suasion. This should provide a foundation for tyranny unparalleled in modern history. Incorporating progressive taxation into MMT’s corpus, for the express purpose of economic and political stability, is suggested in order to achieve the overall aims of the MMT policy advocates. However, this may not be sufficient. In addition, considering increasing the role of governors/leaders of states within the monetary unions may be useful, because those governments do need to follow the old rules of taxation to support spending, and this may provide a counterweight.
Probabilistic constrained load flow based on sensitivity analysis

This paper presents a method for network constrained setting of power system control variables based on probabilistic load flow analysis. The method determines operating constraint violations for a whole planning period together with the probability of each violation. An iterative algorithm is subsequently employed providing adjustments of the control variables based on sensitivity analysis of the constrained variables with respect to the control variables. The method is applied to the IEEE 14 busbar system and to a realistic model of the Hellenic interconnected power system indicating its suitability for short-term operational planning applications. >
Contact and Physical Interaction

This article reviews approaches to controlling robots undergoing physical contact and dynamic interaction with objects in the world. Conventional motion control is compared with a hybrid combination of position and force control. Several challenges are reviewed, most importantly the problems of instability: dynamic instability due to coupling, and static instability due to exerting force. Energetically passive interactive dynamics addresses the former; a minimum stiffness proportional to the force exerted addresses the latter. Actuators, which dominate the robot's interactive dynamics, are briefly surveyed, including series elastic, variable-stiffness, and emerging designs. A comparison with human performance is made. A bioinspired approach to controlling interactive dynamics (mechanical impedance or admittance) is reviewed. Robot configuration profoundly modulates apparent inertia, whereas force feedback control has minimal influence. Superimposing first-order mechanical impedances simplifies controlling many degrees of freedom. It manages redundancy while preserving passivity (unlike null-space projection methods) and enables seamless operation into and out of singular configurations. Expected final online publication date for the Annual Review of Control, Robotics, and Autonomous Systems, Volume 5 is May 2022. Please see http://www.annualreviews. org/page/journal/pubdates for revised estimates.
A holistic overview on the implementation of socially responsible practices in Higher Education Institutions

This paper aims to present a holistic overview of the integration of multiple socially responsible practices in Higher Education Institutions (HEIs). In fact, this topic has nowadays become crucial for universities and other higher education and scientific research institutions to guarantee the satisfaction of the multiple internal and external stakeholders (students, professors, administrative staff, external partners…) and to insure an optimal quality performance of those institutions. For this purpose, we first presented to the university in its changing context; our aim was to show up and to identify the main steps and milestones that characterized the higher education sector. Then, we tackled some several aspects of the University Social Responsibility concept (USR), starting from its roots and relationship with the CSR concept (Corporate Social responsibility), arriving to its diverse definitions. After, we discussed the importance of the university governance system and the stakeholders within the integration of socially responsible practices in HEIs. Moreover, we chose PRME “Principles of Responsible Management Education”, which is a UN (United Nations) initiative, as an example of integrating socially responsible practices in business schools and an inspiration for HEIs in all specialties to proceed in the same way. Finally, we suggested a theoretical model based on the analysis of the different discussed points in this paper. The theoretical model resulting from the analysis made in this article can serve as a basis for future empirical research, with the aim of identifying the main dimensions that act and strongly impact on the integration of socially responsible practices within higher education institutions, in particular through the implementation of a USR approach.