Miracle-dz/UniFAR-FTUs huggingface dataset:
Développement de modules thermoélectriques imprimés et flexibles pour des applications à température ambiante

L’effet thermoelectrique permet la conversion directe et reversible d’un flux de chaleur en courant electrique via l’utilisation de semi-conducteurs de type-p et de type n. Les polymeres conjugues, comme le poly(3,4-ethylenedioxythiophene) (PEDOT) sont pressentis pour etre des alternatives aux alliages de tellurure de bismuth (Bi2Te3) couteux, toxiques et difficiles a synthetiser.Cette these se propose d’ameliorer la conductivite electrique d’un PEDOT et de faciliter sa mise en œuvre par une technique d’impression grande surface comme le spray.La premiere partie porte sur l’amelioration de la synthese par tournette du PEDOT : OTf dont le dopage est stabilise par le contre-ion trifluoromethanesulfonate (OTf-). Plusieurs co-solvants sont testes comme la pyridine ou la NMP. Ces co-solvants permettent de ralentir la polymerisation et d’ameliorer ainsi la structure du materiau. Des conductivites electriques de 3600 S.cm-1 avec un coefficient Seebeck aux environs de 20 µV. K-1 sont atteintes.La seconde partie etudie les avantages et les inconvenients d’une synthese de ce PEDOT : OTf ameliore par spray ultrasonique. Cette technique permet de conserver la formulation developpee pour le depot par tournette. Il est possible d’obtenir des films epais (~ 1 µm) avec une conductivite electrique superieure a 1650 S.cm-1. Des etudes par diffraction des rayons X et de transports permettent de comparer les deux methodes de depot et d’orienter les choix de formulation et de procede.Finalement, avec ces ameliorations apportees, des exemples de modules thermoelectriques imprimes sont presentes et evalues. Ainsi en imprimant plus de 300 thermocouples connectes en serie puis roules, un tel module thermoelectrique occupe une surface inferieure a une piece de 50 centimes d’euro et peut generer 1 µW avec un gradient de temperature de 35 °C.Cette these souhaite pouvoir apporter des elements de reponse sur la relation entre la mise en œuvre et les proprietes electriques des polymeres conducteurs.
Environmental investments as the basis of “green” economy: empirical evidence from Ukrainian companies

Investments in environmental protection are crucial for achieving the goals of building green economy. The purpose of the study is, firstly, to assess the state and trends of Ukrainian companies investments for environmental purposes; secondly, to identify the determinants of the impact on the volume of environmental protection investments; finally, to determine presence /absence of a link between environmental investments and financial performance of companies. The initial data for the study were obtained from published statistical reports for the period from 2010 till 2019. Methods of analysis for testing hypotheses are descriptive and correlation-regression ones. It was found out that the selected independent variables (belonging to environmentally damaging activities and revenue of the companies) are positively correlated with the volume of costs and investments in environmental protection of Ukrainian companies. However, for the independent variable “financial results” a negative correlation was obtained. The hypothesis of environmental investments positive impact on the financial profitability of companies has not been confirmed. Environmental policy in Ukraine concerning implementation of “green” growth strategy is defined as a reflective one due to a number of economic and political factors.
Nicht-ST-Hebungsmyokardinfarkt: Invasive Diagnostik und interventionelle Therapie nach aktueller ESC-Leitlinie

Zusammenfassung Die 2020 neu erschienenen ESC-Leitlinien zum akuten Koronarsyndrom ohne ST-Hebungen überholen die alten Empfehlungen zur invasiven Diagnostik und Therapie aus 2018 in verschiedenen Aspekten. In Bezug auf die initiale Risikostratifizierung wird aktuell nun insbesondere zwischen Patienten mit sehr hohem Risiko sowie hohem Risiko unterschieden, die sofort (< 2 Stunden) oder früh (< 24 Stunden) invasiv diagnostiziert werden sollen. Extern erfolgreich wiederbelebte Patienten mit stabiler Hämodynamik und ohne ST-Hebungen müssen nicht mehr einer sofortigen invasiven Diagnostik zugeführt werden, sollten aber weiterhin im kurzfristigen Abstand invasiv abgeklärt werden. Hinsichtlich technisch-prozeduraler Aspekte wurde die bisherige Empfehlung zur kompletten Revaskularisierung bei stabilen Patienten mit Mehrgefäßerkrankung weiter aufgewertet. Insgesamt sollte eine komplette Revaskularisierung stattfinden – dies kann, muss aber nicht während der Index-Prozedur erfolgen. Ferner kann eine FFR-Messung von Nicht-Culprit-Läsionen während der Index-Prozedur durchgeführt werden. Standardmäßig sollte nun auch für NSTE-ACS-Patienten der radiale Zugangsweg gewählt werden.
Research on elecctro-sorption method for air conditioning system with binary solution

Absorption air-conditioning system is a green air-conditioning system. With binary solution as the working fluid, the system performance is better with lower cost. To further improve the efficiency, an electrosorption method is proposed to regenerate the absorbent solution. Its principle is similar to capacitive deionization. The system with LiBr-CaCl2 has been confirmed in the improvement of performance, while the cost-effectiveness wasn’t ideal to satisfy the need of some cases. To solve this problem, the system with MgCl2-CaCl2 is proposed to analyze the enhancement in the cost-effectiveness. The theoretical and experimental results verify the advantage in the cost-effectiveness compared to the system with LiBr-CaCl2. Although the performance of the system with MgCl2-CaCl2 is lower than the other mixed solution, the actual COP could reach 1.9, which is still better than the system with single absorbents. Meanwhile, the energy recovery characteristic could further enhance the advantage in the improvement of performance for the system with LiBr-CaCl2 and make up the weakness of the system with MgCl2-CaCl2 solution. The exploration of higher energy recovery efficiency will further improve the competitiveness of the system.
Research on verification technology of aircraft RMS based on MBSE

At present, MBSE has shown great application value in aircraft design, but it is still in the exploratory period for aircraft flight test verification and other aspects. Aircraft flight test is a key period connecting the past and the future. RMS verification technology plays an important role in aircraft flight test. How to combine MBSE and RMS to improve the efficiency of guarantee is a main research direction at present. In this paper, through the systematic analysis of the current situation and development needs of RMS verification technology and making full use of the advantages of MBSE, The suggestions are put forward in the stage of aircraft flight test including the production and verification of the model, the guidance of the test by MBSE and the construction of the normative model and example verification. It can provide new ideas and technical support for RMS technology of aircraft.
Eclampsia: A study in a tertiary care centre

Background: Eclampsia is a common obstetric emergency associated with significant maternal and fatal morbidity and mortality rate. Incidence varies from 1 in 100 to 1 in 2000 pregnancies. Eclampsia accounts for 24% of all maternal deaths in India. Eclampsia is a significant cause of perinatal mortality and morbidity in non-industrialised countries (up to 40% perinatal deaths). The aim is to evaluate incidence, management, perinatal & maternal morbidity/ mortality associated with Eclampsia in our hospital setting. Methods: The retrospective study was conducted over a period of 6 months in Obstetrics and gynaecology department of Yashwantrao Chavhan Memorial Hospital, Pune (YCMH). The study included 4712 deliveries from August 2019 to February 2020. Results: The total number of eclampsia cases was 25. The incidence of antepartum eclampsia was 0.53% (25/4712) at our center. Not a single maternal deaths due to eclampsia recorded. There were 6 early neonatal deaths most commonly due to prematurity. Conclusions: The incidence of eclampsia in our study was 0.53%. Majority of patients were in age group of 18-25 years (84%) and with a gestational age of 26-34 weeks (54%). Among 25 patients the 14 patients (56%) were primigravida. No maternal death occurred. Magnesium sulfate was used for treating convulsions in all 25 eclamptic patient. Eclampsia is a life threatening complication of pregnancy, in our study there was no maternal mortality but perinatal outcome still needs to be improved. However an improvement in antenatal care, upgrading the neonatal facilities and early delivery by caesarean section can improve the perinatal outcome.
An Improved Mechanical Sensorless Maximum Power Point Tracking Method for Permanent-Magnet Synchronous Generator-Based Small Wind Turbines Systems

This article proposes an improved maximum power point tracking (MPPT) method without mechanical and voltage sensors for small wind turbines (SWT) systems. The technique is suitable for SWT systems that employ a permanent-magnet synchronous generator (PMSG), a three-phase diode bridge rectifier, and a dc–dc converter, which is one of the most popular configuration for this kind of system. The proposed MPPT extracts the maximum available power from the PMSG operating with variable speed, and it is based on the output power characteristic in relation to the output current of the rectifier. The article proves that a constant output current in the rectifier ensures extracting the maximum electrical power available in the SWT system, independent of the rotational speed. Additionally, this constant current value depends solely on the PMSG characteristics. Therefore, the proposed MPPT control strategy is a simple current mesh with a constant reference that is implemented in a dc–dc converter connected in series to the rectifier, which is responsible to guarantee a constant current in the rectifier output. The proposed MPPT method was corroborated through simulation and experimental results in a 1.5-kW SWT. The tracking efficiency of the proposed MPPT was close to 97.64%.
Reduction of Torque Ripple and Rotor Eddy Current Losses by Closed Slots Design in a High-Speed PMSM for EHA Applications

Electromagnetic performance of high-speed permanent magnet synchronous machines (PMSMs) is studied for electro-hydrostatic actuator (EHA) applications in this article. The electromotive force (EMF) of different magnet pole-arc to pole-pitch ratios is studied. The no-load air-gap density, cogging torque, average torque, torque ripple, core loss, and rotor eddy current losses are investigated by closed slots design. The rotor eddy current losses of different magnetic retaining sleeve materials such as stainless steel, titanium alloy, and carbon fiber are calculated by finite-element analysis (FEA). The results show that, compared with the opening slot structure, the torque ripple and the rotor eddy current losses of closed slot structure are extremely reduced due to the fact that the 11th and 13th harmonics of air-gap flux density are significantly reduced and the slotting effect are effectively weakened. Increase the closed slot height not only reduce the average torque and increase the core loss but also the torque ripple and the rotor eddy current losses reduction effect is slight. A high-speed PMSM with closed slots design is prototyped to verify the analysis.
Geographical characterisation of multifloral honeys from the Marche region (Italy) according to their antioxidant activity and colour using a chemometric approach

Multifloral honeys produced in the Marche region (Italy) were analysed leading to the antioxidant and colour characterisation of this type of regional honeys: the antioxidant activity was determined measuring total phenolic content (TPC), and using ABTS and DPPH assays. The elaboration of data with multivariate analyses enabled differentiation of the geographical origin of honey samples, namely as coming from the Mid/Coastal Hilly or from the High Hilly/Submountain belt of the Marche region. The cluster analysis applied to a selection of samples divided honeys belonging to the Mid/Coastal Hilly belt into three groups showing low, medium and high antioxidant activity and in part located in different areas of the region. Finally, using data of unifloral honeys from the Marche region previously determined, it was possible to have an indication of the prevalent nectar contained in most of the multifloral honey samples harvested in 2012 in the Marche region.
Relationship Between Firm Size and Profitability with Income Smoothing: Evidence from Food and Beverages (F&B) Firms in Jordan

This study examines whether firm size and profitability have an influence on the income smoothing practices of food and beverages (F&B) firms listed on the Amman Stock Exchange (ASE). All 8 F&B firms listed on the ASE are used as the study sample. Eckel model is used in determining whether a firm is smoother or non-smoother. The natural logarithm of total assetsis used as an indicator for firm size, and return on equity is used as an indicator for profitability. Financial leverage is used as a control variable and measured using debt ratio. Data covering the period 2010–2019, of the firms is used in the analysis and hypotheses testing. Descriptive statistics are used in data analysis, and the logistic and multiple regression methods are used in hypotheses testing. All hypotheses are tested under a 95 percent level of confidence, which is equivalent to 0.05, a predetermined coefficient of significance. The study shows that firm size has a positive significant influence on income smoothing, while profitability does not have. Moreover, the study reveals that there is a collective significant impact of both firm size and profitability, when taken together, on income smoothing.
Hybrid Finite Element Method for Reconstructing Electric Field Distribution of Dielectric Object Excited by Dipole Antenna

This paper presents an inverse method to reconstruct an antennaexcited electric field distribution of a dielectric object from measured field data, for the purpose of noninvasive SAR evaluation in the human phantom. The proposed method is a hybrid method combining the Boundary Integral Equation (BIE) and Finite Element Method (FEM). The BIE for the electromagnetic (EM) fields and equivalent currents of a radiating source are discretized using the method of moments (MoM) while EM fields in the scatterer and its surroundings are discretized using the FEM. The effectiveness of the method is tested numerically and experimentally using a dipole and a dielectric cuboid at 2.5 GHz. The numerical reconstruction achieves acceptably good agreement with that of reference as a whole. However, it is found from the experiment that the method is considerably sensitive to the measurement error. The factors that may have contributed to the errors are shortly discussed.
Sulfidation kinetics of copper oxide nanoparticles

Sulfidation of copper oxide nanoparticles (CuO NPs) in urban wastewater systems is expected to influence their impact on the environment. However, the kinetics of this reaction has not been studied to date and the reaction mechanism remains largely unexplored. We therefore investigated the sulfidation kinetics of CuO NPs reacted with bisulfide (HS−) at concentrations relevant to wastewater systems. Pristine CuO NPs (50 nm, 7.7 μM) were reacted with HS− (26.4–105.6 μM) in oxic solutions buffered to pH 8.0. The reaction progress was monitored using silver nitrate to quench the reaction and selectively dissolve the copper sulfides (CuxS) and zincon to spectrophotometrically quantify the released Cu2+. In addition, the reaction products were characterized at selected time points using analytical electron microscopy and X-ray absorption spectroscopy (XAS). The sulfidation rate of the CuO NPs was best described by a pseudo first order rate law and the corresponding half-life times ranged between 1 and 6 minutes. XAS results showed that crystalline CuO NPs rapidly transformed into amorphous CuxS and gradually into crystalline CuS (covellite). The comparable size of pristine and transformed primary particles, the similar morphology of their aggregates, and the initial formation of CuO–CuxS core–shell structures revealed by analytical electron microscopy suggest that the initial sulfidation occurred via a direct conversion reaction mechanism. Our findings suggest that CuO NPs released from various sources into wastewater will rapidly transform into amorphous CuxS and eventually recrystallize into covellite.
Clinical and sociodemographic characteristics of glaucoma patients at a tertiary referral facility in Zimbabwe

Purpose To evaluate the clinical and socio-demographic profile of patients living with glaucoma and receiving care in a tertiary eye center in Zimbabwe. Method A hospital-based retrospective study of clinical records of glaucoma patients from January 2014 to December 2018. The study involved collating demographic information of patients, visual acuities, (VA) intraocular pressure, (IOP), cup-to-disc ratios, (CDRs), average retinal nerve fibers thickness, (RNFL), cup volume, cup-to-disc area, vertical cup-to-disc ratio, (VCDR), rim area, disc area, glaucoma hemifield test, visual field indices and the management of glaucoma. Results Nine thousand one hundred and eighty-five (9,185) folders were retrieved. Out of these, 432 (4.7%) qualified for the study and were analyzed. There were 267 (61.8%) males and 165 (38.2%) females. The mean age (± Standard deviation, SD) of the patients was 62.66 ± 15.94 years, (range 10 - 110 years). The means visual acuity (VA): OD =1.30 ± 1.06 Logarithm of the Minimum Angle of Resolution, (logMAR), OS = 1.33 ± 1.06 logMAR; IOP: OD = 29.51 ± 12.89 mmHg, OS: 29.17 ± 12.59 mmHg; CDRs: OD = 0.91 ± 0.14 D, OS = 0.92 ± 0.14 D; and the average RNFL thickness was 72.76 ± 18.26 µm and 71.24 ± 23.17 µm in the right and left eye respectively. The mainstay of treatment was medication only. Conclusion There were more males than females receiving glaucoma care at the tertiary level. Glaucoma cases included juveniles but the mean age was mostly the elderly. It was characterized by high IOPs, large CDRs, and thin RNFL suggestive of late presentation.
Enabling Resonant Commutated Pole in Parallel Power FET Bridge Legs

To meet the requirements of higher current ratings and lower thermal impedances, paralleling power field-effect transistor (FET) discretes or modules is often a cost-effective or even an unavoidable solution. While paralleling FETs allows for a significant reduction in conduction loss, the switching loss is increased in hard-switching applications. This article proposes a generic soft-switching modulation scheme for parallel power FET bridge legs. Part of the paralleled FET legs is chosen as an auxiliary leg that is turned on prior to the remaining main legs. A resonant commutated pole (RCP) mode is then created, which enables the high-side FET of the auxiliary leg to achieve zero-current switching (ZCS) or quasi-ZCS and the remaining FETs to achieve zero-voltage switching. Thus, we can significantly reduce the switching loss that normally dominates the total power loss of high-frequency hard-switching converters particularly at partial and light loads. Experimental results from three parallel GaN high-electron-mobility transistor legs validate the effectiveness of this RCP-enabled solution in reducing switching losses and improving power conversion efficiencies. This article is accompanied by supplementary JIF and PDF files demonstrating the operational details of the RCP mode.
ENTREPRENEURSHIP-INSIGHTED VILLAGE-OWNED ENTERPRISE (BUMDes) LEADERSHIP CONCEPT IN REALIZING A COMPETITIVE AND SUSTAINABLE DEVELOPMENT STRATEGY OF THE SINARANCANG TOURISM VILLAGE

Sinarancang Village as the Setu Patok area has the potential for natural tourism and potential open public spaces. Sinarancang Village has a strategic location because it is close to Setu Patok. The potential for natural and river tourism along with the community mortar home industry are some of the attractions that motivate BUMDes Rancang Jaya to develop it as a tourist village. BUMDes Rancang Jaya, as a newly established company owned by the Village of Sinarancang, has a vision of creating a tourism village called Sinarancang, which is able to attract Cirebon tourists to visit. BUMDes Rancang jaya has been observing and studying other BUMDes that have succeeded in developing tourist villages and attracting tourists. They see the motivation of tourists in visiting Sinarancang Village because of its location near Setu Patok with beautiful views. This is one of the reasons why tourism needs to be developed for developing villages as a means of capturing new opportunities in meeting community needs. The purpose of this study is to identify entrepreneurial characteristics that are applied in business development carried out by BUMDes and to describe the concept of BUMDes leadership which has entrepreneurial characteristics in realizing the development strategy of the Sinarancang tourism village. This study used a qualitative descriptive method with secondary data analysis in the form of village policy documents and primary data analysis from observations and interviews. Regional leadership needs to demonstrate entrepreneurial characteristics. In this case, the leadership of BUMDes Rancang Jaya has shown the beginnings of entrepreneurial characteristics according to Schumpeter (1934) and Kirzner (1973), namely believing in change and making innovations in institutional settings. To realize the development strategy of the Sinarancang Tourism Village, it requires BUMDes leadership with entrepreneurial insight, namely those that fulfill 6 entrepreneurial characteristics in the context of regional development (Stimson, 2009), so that the motivation of entrepreneurship in the context of regional development is realized, namely creating individual economic benefits that occur from cultural enhancement or the regional economic context (business climate) and social welfare as well as community benefits stemming from spillover and institutional effects.Keywords: Sinarancang, Tourism Village, BUMDes, Regional Leadership, Entrepreneurship
Effect on Ammonium Bromide in dielectric behavior based Alginate Solid Biopolymer electrolytes

This paper present the development of solid biopolymer electrolytes (SBEs) system which has been accomplished by incorporating various composition of ionic dopant namely ammonium bromide (NH4Br) with alginate solution casting method. The prepared sample of SBEs has been analyzed via electrical impedance spectroscopy (EIS) showed that the ionic conductivity at room temperature was increased from 4.67 x 10-7 S cm-1 for un-doped sample to optimum value at 4.41 x 10-5 S cm-1 for composition of 20 wt. % NH4Br. The SBEs system was found to obey the Arrhenius characteristics with R2~1where all sample is thermally activated when increasing temperature. The dielectric behavior of the alginate-NH4Br SBEs system were measured using complex permittivity (ε*) and complex electrical modulus (M*) and shown the non-debye behavior where no single relaxation was found for present SBEs system.