Miracle-dz/UniFAR-FTUs huggingface dataset:
Dual sourcing under heavy-tailed demand: an extreme value theory approach

We consider a single-period dual-sourcing problem in which a buyer purchases its products from two different suppliers and sells them to a market with uncertain demand. One supplier is cheaper but less responsive, whereas the other supplier is more responsive but more expensive. The buyer determines the order quantity from the low-cost supplier and the capacity level from the responsive supplier in such a way that maximises its profit. We apply extreme value theory to analyse the impact of tail heaviness of demand distribution on optimal dual-sourcing strategy. We numerically find that tail heaviness moderates the effect of increasing demand uncertainty on optimal order levels. We also show that dual sourcing allows companies to increase their fill rates cost effectively under heavy-tailed demand if the capacity reservation cost of the responsive supplier is relatively low.
Clima y concentraciones de polen de gramíneas en el País Vasco

La información sobre los niveles de calidad del aire en las ciudades españolas raramente incluye las partículas de origen orgánico, de las que el polen es un componente fundamental, responsable de numerosas patologías respiratorias y un buen marcador de los cambios ambientales. Este trabajo analiza la relación entre el polen de gramíneas medido en las tres capitales vascas y las condiciones atmosféricas, tanto a escala local como regional. Los resultados sugieren que una parte sustancial del polen de gramíneas medido en el País Vasco procede de ámbitos ajenos a esa Comunidad Autónoma, arrastrado por vientos de componente S y E y situaciones sinópticas del SW y SSE.
Why the molten salt fast reactor (MSFR) is the “best” Gen IV reactor

A simultaneously “nuclear”, permanent, and in‐time solution to mankind's energy‐related problems would require the relatively rapid manufacture of 10,000–30,000 genuinely sustainable, full‐sized (~1 GWe) reactors. This “nuclear renaissance” would have to be implemented with breeder reactors because today's commercial nuclear fuel cycle is unsustainable and based upon a fuel (235U) that is intrinsically expensive and politically problematic. The purpose of this paper is to point out why a simple/cheap “minimal reprocessing” implementation of the European Union's (EU's) molten salt fast reactor (MSFR) concept represents the most promising way to implement that technical fix:
Generalised space vector PWM for sinusoidal output voltage generation with multiphase voltage source inverters

The paper presents a generalised approach towards the development of the space vector pulse width modulation (SVPWM) for sinusoidal output voltage generation with two-level multiphase voltage source inverters (VSIs), where the number of phases is an odd number. The generalisation can greatly speed up the implementation since the tedious analysis of 2n voltage space vectors of an n-phase inverter in the corresponding (n − 1)/2 2-D planes can be completely avoided. Required dwell times for active space vectors are correlated with trigonometric properties of multiphase systems, which account for the actual phase number. Feasibility of the developed approach has been verified experimentally using the five-phase and seven-phase SVPWM schemes as examples.
Green Cloud Computing: An Experimental Validation

Cloud configurations can be computational environment with interesting cost efficiency for several organizations sizes. However, the indiscriminate action of buying servers and network devices may not represent a correspondent performance number. In the academic and commercial literature, some researches highlight that these environments are idle for long periods. Therefore, energy management is an essential approach in any organization, because energy bills can causes remarkable negative impacts to these organizations in term of costs. In this paper, we present a research work that is characterized by an analysis of energy consumption in a private cloud computing environment, considering both computational resources and network devices. This study was motivated by a real case of a large organization. Therefore, the first part of the study we considered empirical experiments. In a second moment we used the GreenCloud simulator which was utilized to foresee some different configurations. The research reached a successful and differentiated goal in presenting key issues from computational resources and network, related to the energy consumption for real private cloud.
Infrastructure enhancement for restoration of distribution systems following extended outages

ABSTRACT Advances in micro-electronics, computers, and communications technology has made it possible to automate several functions in distribution systems. Such automation will make delivery of electricity more efficient, enhance reliability, and lead to more effective utilization and life-extension of existing electricity distribution infrastructure. Moreover, distribution automation offers opportunities for implementation of new functions. With certain enhancements in the distribution system infrastructure maximum benefits of distribution automation can be accrued. In this paper, an example of such infrastructure enhancement is presented. Specifically, application of remotely controlled three-phase and single-phase sectionalizers in restoration of power in distribution systems following an extended outage is presented. The remotely controlled sectionalizers can be opened and closed to supply power to specific parts of the system. Thus, restoration can be done in steps using these sectionalizers. Theref.
Evaluación del pensamiento computacional para el aprendizaje de programación de computadoras en educación superior

El trabajo describe los resultados que se han obtenido de la evaluación del pensamiento computacional del 2016 al 2019 para determinar un estado diagnóstico de los estudiantes que cursan la materia inicial programación de computadoras en educación superior. El caso de estudio se enmarca en el nivel técnico superior universitario en Puebla-México, pero se ha realizado también un diseño experimental para la universidad tecnológica de Chile. Por medio de la selección de cinco reactivos en correspondencia a cinco habilidades del pensamiento computacional (abstracción, generalización, descomposición, diseño algorítmico y evaluación) se establece una relación con los contenidos temáticos del curso, por lo anterior, se ha podido determinar cuales serían las fortalezas y debilidades de los estudiantes con el objetivo de apoyar su desempeño académico. Dos resultados destacan del trabajo realizado. Primero, conocer a través de dos encuestas solicitadas durante cada intervención, el impacto en los estudiantes de la evaluación para la adquisición de las competencias. Segundo, a partir de la tercera intervención, obtener una predicción de la retención de matrícula al menos para el primer cuatrimestre. The objective of the article is to present the knowledge generated by carrying out an evaluation of specific computational thinking skills from 2016 to 2019. The aforementioned to determine the initial status of new students to the information technology career at the Universidad Tecnológica de Puebla -Mexico and promote academic performance in the Programming Methodology course in higher education. Through the selection of five items corresponding to five computational thinking skills (abstraction, generalization, decomposition, algorithmic design and evaluation) a relationship is established with the thematic contents of the course; therefore, it has been possible to determine what the strengths and weaknesses of students in order to support their academic performance. Two results stand out from the work done. First, the favorable impact on students for the acquisition of skills through surveys requested during each intervention. Second, from the third intervention, obtain a prediction of enrollment retention for at least the first four-month period. Based on the experimental design carried out in Mexico, the design proposal for the Technological University of Chile is also discussed.
The Theory of Three Phase Induction Squirrel Cage Motors

The study of steady state operation of squirrel cage induction machines may be seen from the point of view of the theory of circuits with periodically variable mutual inductances. Thus, there is no initial splitting of flux linkages between main and leakage linkages ; such a splitting may be either completely avoided, or delayed until equivalent circuits are defined ; in the latter case, particularly simple formulas are given to express the harmonic leakages of the squirrel cage. Considering a very large number of harmonics of the variable mutual inductances is as simple and as straightforward to use as the definition of harmonic leakages, and as accurate as the use of zig zag and belt leakages concepts.
Relationship between performance and timing recovery mechanisms for a DECT link in dispersive channels

The performance of DECT (digital European cordless telecommunications) radio links under dispersive channel conditions is studied as a function of clock recovery strategies. It is shown that due to the non-optimal sampling, analytical and practical results based on fixed timing will not be acceptable above delay spreads of ∼40ns. On the other hand, a burst-adaptive clock recovery scheme can more than double this range.
The Level of Psychological Well Being and Its Relationship to Gratitude Among Mutah University Students Who Changed Their Majors

The study aimed to identify the level of psychological well-being and its association with gratitude among Mutah university students who changed their majors. The sample of the study consisted of (266) male and female students. To achieve the objectives of the study, two scales were developed namely, the psychological wellbeing scale and the Gratitude Scale. The validity and reliability of the scales were verified. The results indicated that: A) the level of psychological well being and gratitude among the students of Mutah University was moderate; B) there was a positive and acceptable relationship between these two variables; C) male students were more grateful than female students, and that the students in humanities colleges ( male and female ) were more grateful than students in scientific colleges and D) gratitude contributes in an acceptable way to shaping the level psychological wellbeing. The study recommended directing high school students and their families to choose university majors that fit the preferences and abilities of these students, and which is demanded by the labor market.
A multi-grid extended finite element method for elastic crack growth simulation

The eXtended Finite Element Method (X-FEM) has been applied to a wide range of applications, in particular for crack growth simulations in structural mechanics. However, for real applications (engineering simulations,.), even if one does not need to mesh the crack, it is necessary to take into account the different spatial scales linked to the size of the domain, the geometry of the boundary, the size of the boundary with prescribed displacement or loading, the discretized "representation" of the crack,. In this respect, one proposes in this paper to couple the eXtended Finite Element Method with a multi-grid strategy. Details are given for numerical implementation with a hierarchical finite element strategy. Finally, some examples are given (mixed mode crack growth simulations) to validate the method.
In-line optical-fibre filter for wavelength multiplexing

An optical-fibre wavelength-selective directional coupler has been fabricated using evanescent-wave coupling between fibres of dissimilar core radii and refractive-index profiles. This device has a nonperiodic filter response with a bandpass of 90 nm FWHM centred around 1.22 µm, and has a peak coupling efficiency of 60% with an excess loss of 0.2 dB.
Overview of alliancing research and practice in the construction industry

The increasing attention to alliancing in the construction industry has led to a number of studies in recent years. It is time to present the state of the art of the existing studies on alliancing, identify research gap and opportunity and provide suggestions for future research. This article launches a review and analysis of more than 70 alliancing literatures produced in the last decade, which is organized and synthesized following a five-stage knowledge progression framework. In this way, the limitations of previous studies and knowledge gaps can be identified. Despite the fact that previous studies on alliancing offered various degrees of value to the alliancing practice, some limitations and debates remain awaiting further investigation. In addition, the significant changes associated with alliancing also provide opportunities for future research. Drawing upon transaction cost economics, the article concludes that (i) the efficiency of alliancing in the construction industry needs to be examined, and (ii) the cost management and control practices used in alliancing are worth being explored. Possible research methods are also proposed for carrying out future studies. The information presented in this article may guide scholars and practitioners' endeavour in new alliancing research and practice.
Copper Losses and Rotor Losses Calculation for the BLDCM Used in a Flywheel Energy Storage System

This paper presents a finite element investigation into the copper losses and rotor eddy current losses in brushless DC motors used in a flywheel energy storage system. The copper and rotor losses generate heat which needs to be dissipated in order to not exceed a defined temperature level for the magnet or winding insulation to avoid demagnetization or damage, which if it occurs will reduce the motor performance. The principle of operation and losses calculations are presented in the paper. The influences on the copper and eddy current losses are analyzed in detail, including the operation mode, the control strategy and the variation of the speed. Simulation and experimental results are presented and discussed.
Input impedance of probe‐fed multilayer rectangular microstrip patch antenna using the modified Wolff model

The modified Wolff model (MWM)‐based cavity model is presented for the simple and accurate computation of the input impedance of a probe‐fed multilayer rectangular microstrip patch antenna. Results of the MWM are compared with both the experimental data and data of the MoM, with agreement within 1.5% for resonance frequency and within 0.15 for normalized input impedance. Further results are presented on the input impedance of a suspended rectangular microstrip patch antenna with a two‐layer superstrate. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 237–239, 2001.
Serum Globulin

A family of globular proteins found in blood that does not include albumin. These proteins are insoluble in water but solubility is increased in dilute salt solutions. Globulins are grouped into four categories (alpha 1, alpha 2, beta and gamma) based on differences in electrophoretic mobility.
A Capstone Senior Design Project: Thermal Design of Insulated Pipes That Carry Hot Single-Phase Fluids and are Immersed in Atmospheric Air

The accurate estimation of the insulation thickness of pipes carrying hot fluids may be achieved rapidly in an unprecedented manner articulating knowledge of courses on numerical methods and heat transfer. The aim of this paper on engineering education is to demonstrate that the algebraic solution of a lumped energy equation combined with an iterative solution of a nonlinear algebraic equation enables students to design insulation thicknesses of pipes carrying hot fluids with laminar or turbulent motion. The input data for the lumped energy equation consists of two parts. The internal part requires the use of the distribution of axial-mean internal Nusselt number for a thin-walled pipe with a prescribed surface temperature. The external part demands the use of the peripheral-mean external Nusselt number for a solid cylinder at a constant temperature. The allowable heat loss to the ambient air constitutes the primary design constraint in the thermal design project. The preliminary phase of such a project is covered in all text books on heat transfer from a simple and unrealistic idealization of one-dimensional conduction of heat, but has never been attempted for a realistic situation of two-dimensional convection of heat.
Preamble insertion in future satellite-terrestrial OFDM mobile broadcasting standards

This paper investigates the possibility of inserting in future satellite-terrestrial OFDM standards a preamble in order to improve frame detection and frequency estimation performance. The preamble, based on a complementary set of sequences, is exploited by a novel joint frame detection/frequency estimation scheme. Numerical results show that this strategy can outperform the classical guard interval based schemes, especially in very challenging scenarios, such as hybrid satellite-terrestrial mobile channels. (6 pages)
Quality management and manufacturing strategies in China

Quality has been identified as a key competitive weapon in the global market. Chinese firms are making considerable effort in implementing quality management in order to gain global competitiveness. The purpose of this study is to compare and contrast manufacturing strategies and business practices between TQM and traditional (or non‐TQM) firms in the Chinese manufacturing industry. This study explores the differences that may exist between TQM and traditional non‐TQM firms in manufacturing strategies and business practices by analyzing survey results of 243 Chinese manufacturing firms. Differences between TQM and traditional non‐TQM firms are investigated in several respects.
An Experimental Consideration on Spatial Correlation and Minimum Eigenvalue for MIMO System using Polarization

Improvement of reliability of wireless communication by using orthogonal polarization in the MIMO systems is demonstrated with channel measurement. Additionally a mechanism of the improvement is discussed from eigenbeam patterns. We have validated that spatial correlation, minimum eigenvalue, and channel capacity are improved by using cross polarization in MIMO branches even if the propagation environment varies. The improvements are achieved because two orthogonal electrical channels are formed in one physical path, and powers of the path whose polarization is varied in propagation channel is picked up by the orthogonal antennas. (5 pages)
Improving Design Coordination for Building Projects. I: Information Model

Detailed design of building projects is a complex multidisciplinary process highly dependent upon effective aggregation of individual designs to produce a coherent set of final design documents. Throughout the detailed design process, changes are frequently introduced and need to be properly managed among the various members of the design team. This paper presents an information model for storing design information, recording design rationale, and managing design changes. The proposed model is built around a central library of generalized building components that can be used to describe a complete building project hierarchy. Each component allows the designer to store desired performance criteria and related design rationale. Each component is also sensitive to its own changes and automatically communicates such changes to affected parties through preset communication paths. The model, as such, provides improved design coordination and control over changes, thus helping to increase the consistency and productivity of the overall design process. Conceptual details of the model are described in this paper, and model implementation into a collaborative design system is presented in a companion paper.
Consumer preferences for organic vegetables in southwestern Nigeria: A choice experiment approach

In sub-Saharan Africa, identifying estimates of consumers’ preferences and willingness to pay (WTP) for safe food continues to receive attention in the literature. Using experimental data from Nigeria, we examined the source of heterogeneities in preference and WTP for organically produced food. The subjective valuation by consumers of certification in relation to third-party certification and the participatory guarantee system (PGS) was also investigated. A sample of 196 households subjected to a discrete choice experiment yielded 1 764 observations that were analysed using the generalised multinomial logit and mixed logit models. The results reveal a strong preference for food safety in terms of reducing chemical residue, which dominated the respondents’ preference and WTP patterns. Concerning certification attributes, consumers were positively disposed to third-party certification, but showed no significant preference for the PGS form of certification. Significant heterogeneities in preference were due mainly to age and awareness of organic products. We suggest that policies should focus on consumers’ understanding of organic food, third-party certification, and organic agriculture
Performance of Frequency-Domain Reflectometer, Capacitance, and Psuedo-Transit Time-Based Soil Water Content Probes in Four Coarse-Textured Soils

Frequency-domain reflectometry (FDR), capacitance (C), and psuedo-transit time-based (PTT) soil water content(SWC) probes have gained a broad acceptance for measurement of volumetric SWC (.v) in agricultural fields and otherapplications. The . v of typical coarse-textured soils can range from as low as 0.02 m3 m-3 at permanent wilting point to0.1 m3 m-3 at field capacity. Thus, a small change in . v would result in a change of a large portion of the total available water.Therefore, the SWC probes used to estimate . v in coarse-textured soils must be accurate and sensitive enough to detect smallchanges in . v. Few data that analyze the performance of these probes in coarse-textured soils (>90% sand) exist. Theobjectives of this research were to: (i) evaluate the validity of the calibration curves provided by the manufacturers for threeSWC probes (CS615-FDR., TRIME-PTT., and PR1-C.) for estimating . v in four coarse-textured soils, and (ii) identifywhether the performance of the probes is sensitive to soil type. Soil drying cycle experiments were conducted using threefine-sandy soils (Astatula, Ellzey, and Arredondo) and a fine sandy-loam soil (Dothan). Measurements began atnear-saturation and continued until the . v in each soil was near wilting point. The probe-estimated . v data were statisticallycompared with measurements of . v by the gravimetric method (.v-grv). Significant variations were observed in probeperformance between soils. The CS615-FDR probe provided the most accurate . v estimates. Performance of the TRIME-PTTprobe was lower than that of the CS615-FDR in all soils and its estimates were significantly different than the measured . v-grvvalues in all soils. The PR1-C probe provided the least accurate estimates overall and the root mean squared error (RMSE)ranged from 0.04 m3 m-3 in Ellzey soil to 0.05 m3 m-3 in other soils. Its estimates were significantly larger than the measured.v-grv in all soils, except Dothan. The CS615-FDR and TRIME-PTT probes produced their least accurate estimates in Dothansoil, which had the largest clay content (22.7%) among all soils. The variations in the performance of the probes betweenthe soils suggest, in part, that the FDR and PTT-based methods are not completely independent of the soil type and arenegatively affected by the clay content of the soil. All probes should be calibrated for an individual soil under considerationto obtain accurate.v estimations in coarse-textured soils. The calibration curves developed in this study should provide usefultechnical information to users when working with similar SWC probes and soils that have similar physical characteristicsto those used in this research.