Miracle-dz/UniFAR-FTUs huggingface dataset:
Fuel cell based uninterrupted power sources

This paper presents the concept of providing a power source for essential utilities under emergencies for a power outage as long as 240 hrs. After a careful analysis of various options for providing longer duration back-up power sources, the authors are of the opinion that hydrogen-based fuel cells can be the ideal solution. When commercial mains is available, hydrogen is generated by operating the fuel cell in the electrolyser mode. This hydrogen is stored and utilized under emergency conditions to generate power through the fuel cell. The necessary power controller can source the stabilised power and can also source energy to generate hydrogen as well as charge batteries. The output demanded by the load will be converted from DC to the required AC source by the same controller.
Straight versus modular nail: Analysis of mechanical properties two knee arthrodesis methods.

Background Complications after arthroplasty often result in irreversible disability. In some cases for the extremity to be salvaged, the permanent knee joint arthrodesis is the last-chance procedure. Modular implant design simplifies surgical technique but modularity may potentially compromise mechanical strength of an implant. Mechanical properties of the implant are particularly important in case of knee arthrodesis without bone-on-bone contact where forces during gait and weight bearing are transmitted directly through the nail. The aim of this article was to perform comparative analysis of the mechanical properties of modular nail CHARFIX2 FN, when compared to the femoral nail, used for knee arthrodesis; and to analyze the effectiveness of treatment with use of this nail based on the observations of clinical cases. Methods Comparative analysis of: the static 4-point bending test, dynamic 4-point bending test and static torsion test. All tests were performed in accordance with requirements of ASTM F 1264. A clinical analysis of 5 cases, in which CHARFIX2 FN nails were used, was also performed. Results Based on the results of mechanical tests, the strength characteristics of CHARFIX2 FN nail have been found superior and more advantageous than corresponding features of the standard femoral nail. For CHARFIX2 FN nail, the median for flexural stiffness was almost 4 times higher and for maximum torque value was almost 2 times higher when compared to the femoral nail. Observations of the clinical cases gave satisfactory results. Conclusions The obtained mechanical tests present significant differences between CHARFIX2 FN and the femoral nail in mechanical strength and, therefore, its improved stability and safety for patients during walking. It can be used for permanent knee immobilization with satisfactory clinical results. The functional outcomes and subjective measurements of pain in patients treated with CHARFIX2 FN group are satisfying.
A method suitable for comprehensive assessment of wind power penetration capability of regional power grids including multiple wind farms

This paper proposes a comprehensive assessment method of wind power penetration capability for multiple points of connection of wind farms, considering peak load regulation, static security, static voltage stability and transient stability constraints of power system. A mathematical model of the comprehensive assessment method is built, and the calculation process of the wind power penetration capability for multiple points of connection is designed. An actual regional power grid in a province is taken as an example to proven the validity of the proposed method.
IMPACT ASSESSMENT FOR CLIMATE CHANGE IN THE MIDORI RIVER BASIN WITH LARGE ENSEMBLE CLIMATE SIMULATION DATA

The aims of this study are to assess a future change of heavy rainfall caused by climate change and to propose an evaluation method for quantitatively evaluating flood frequency by using of d4PDF, a large ensemble climate projection dataset. In recent years, the effects of climate change have become apparent, such as a rise in temperature, an increase in the frequency of flood. In Japan, record-breaking heavy rain caused extensive damage along a river basin year after year, e.g. the heavy rainfall event of July 2017 in Kyushu Hokubu, the heavy rainfall event of July 2018. Rainfall is expected to become more intense because global warming has boosted the number of record-breaking rainfall events. In order to protect people’s lives and property under climate change, it is necessary to take adaptation measure to prevent or reduce damage expected in the future. Planning of adaptation for climate change will be based on assessments of disasters caused by extreme events. A large ensemble of climate simulations with high-resolution atmospheric models is useful. The results of these simulations, named d4PDF, are now being used in various impact assessment studies for natural disasters. In this study, the annual maximum rainfall events were extracted from the large ensemble database “d4PDF”. And then, we examined spatiotemporal characteristics of basin-averaged rainfall in the Midori River basin. Furthermore, flood runoff analysis were conducted to examine a quantity of discharge expected under global warming.
FAKTOR-FAKTOR YANG MEMPENGARUHI STRUKTUR MODAL PADA PERUSAHAAN DI SEKTOR AGRICULTURE YANG TERDAFTAR DI BURSA EFEK INDONESIA PERIODE 2007-2011

Penelitian ini bertujuan untuk menganalisis faktor-faktor perusahaan yang memberikan pengaruh pada struktur modal. Variabel-variabel yang dipakai yaitu profitability, liquidity, growth, size, dan business risk. Penelitian ini memakai pendekatan kuantitatif dengan modal analisis linier berganda. Penelitian ini memakai sampel berupa laporan keuangan secara runtut setiap tahunnya selama periode 2007-2011 pada perusahaan di sektor Agriculture yang terdaftar PT Bursa Efek Indonesia. Penelitian ini menggunakan sampel sebanyak 60 observasi. Hasil penelitian ini menunjukkan bahwa variabel profitability dan size berpengaruh signifikan terhadap struktur modal tetapi memiliki arah negatif (-). Variabel liquidity, growth, dan size berpengaruh signifikan positif terhadap debt.
Remediasi Menggunakan Multi-representasi Untuk Mengurangi Siswa SMA Yang Tidak Dapat Menyelesaikan Soal Hukum Archimedes

Abstract: This research aimed to introduce and to train and to apply multi-representation. They were expected to be able to apply multi representation to solve essay questions about Archimedes Law. Research method was pre-experimental design by conducting one group pretest-posttest design . There were 36 students of XI Natural Science in SMA N 7 Pontianak which involved in this research. Essay test with reliability coefficient (0.63) was applied to find out the average number decrease percentage of students who unable to solve the test at pre and post remediation. McNemar test stated that kind of remediation is able to reduce the number of student who unable to solve questions which spread in 4 indicators that are comparing mass in air and in water, sinking phenomena, floating phenomena, and flying phenomena. By applying McNemar test, the researcher obtained (3,84) < (4,92; 10,31; 4,05; 14,06) for db = 1, so there was a change in the number of students who unable to solve the question significantly in all test indicators. Therefore, remediation using multi-presentation was effective to reduce the number of students who unable to solve question in Archimedes Principles Mattter. Keyword: Remediation, Multi-representation, Archimedes Law. Abstrak: Penelitian ini bertujuan untuk mengenalkan dan melatih siswa kelas XI IPA SMA Negeri 7 Pontianak menggunakan multi-representasi. Diharapkan siswa mampu menggunakan multi-reprsentasi untuk mengatasi kesulitan dalam menyelesaikan soal berbentuk essay pada materi hukum Archimedes. Metode penelitian yang digunakan yaitu pre-eksperimental design dengan rancangan one group pretest-posttest design . Sebanyak 36 siswa kelas XI IPA 3 SMA Negeri 7 Pontianak berpartisipasi dalam penelitian ini. Tes berbentuk cerita dengan koefisien reliabilitas (0,63 dan 0,713) digunakan untuk mengetahui rata-rata persentase penurunan jumlah siswa yang tidak dapat menyelesaikan soal sebelum dan sesudah remediasi. Uji McNemar menyatakan bahwa remediasi semacam ini dapat menurunkan jumlah siswa yang tidak dapat menyelesaikan soal yang tersebar pada membandingkan berat benda di udara dan di air, peristiwa tenggelam, peristiwa mengapung dan peristiwa melayang. Berdasarkan hasil uji McNemar diperoleh perubahan kemampuan siswa yang signifikan dalam menyelesaikan soal untuk semua indikator soal tes, (3,84) < (4,92; 10,31; 4,05; 14,06) untuk db=1 dan . Dengan demikian, remediasi menggunakan multi-representasi efektif untuk mengurangi jumlah siswa yang tidak dapat menyelesaikan soal pada materi hukum Archimedes. Kata kunci: Remediasi, Multi-representasi, Hukum Archimedes
Distributed generation plannmg

When electric generating efficiencies are compared on the basis of similar levels of technology, there is, and probably always will be, a significant economy of scaZe in favor of larger electric generators. Simply put, physics is on the side of the larger generator, and there are no signs that that advantage will change anytime in the: foreseeable future. Distributed and dispersed generators gain an advantage only because their small size means they can be close to the site of energy use, thus avoiding power delivery (T&D) costs fiom a larger, and more efficient, generator’s site. When this savings in delivery charges exceeds their disadvantage in efficiency versus the larger generators, DG units “win” on the basis of overall economics. Generally, this happens in one of two cases, where existing infrastructures, particularly in urban areas, are incapable of meeting growing load without very costly upgrades, and in rural areas, where the length of power delivery lines to remote sites would be very costly. Distributed generation generally works best in any of four situations:
Adquisición de variables de tráfico peatonal utilizando visión por computador

El problema de trafico tiene diferentes componentes que pueden ser analizados: los vehiculos, los peatones y la interaccion entre ellos. En este trabajo se propone un metodo de adquisicion de variables de trafico peatonal, utilizando tecnicas de vision por computador. A partir de una secuencia de video son detectados los peatones aislados, los grupos de peatones y los vehiculos de la escena, utilizando un modelo del fondo. Los peatones son seguidos en la imagen por medio de caracteristicas de su contorno y flujooptico. El conteo de peatones es realizado sobre cualquier zona de la escena para estimar el flujo y la direccion de movimiento. El metodo propuesto puede ser configurado bajo diferentes perspectivas a partir de un conjunto de ejemplos. Los resultados experimentales en cruces peatonales demuestran que el metodo permite estimar las variables de interes en escenas complejas.
Research and Applications The 2019 n2c2/UMass Lowell shared task on clinical concept normalization

Objective: The n2c2/UMass Lowell spin-off shared task focused on medical concept normalization (MCN) in clinical records. This task aimed to assess state-of-the-art methods for matching salient medical concepts from clinical records to a controlled vocabulary. We describe the task and the dataset used, compare the participating systems, and identify the strengths and limitations of the current approaches and directions for future research. Materials and Methods: Participating teams were asked to link preselected text spans in discharge summaries (henceforth referred to as concept mentions) to the corresponding concepts in the SNOMED CT (Systematized Nomenclature of Medicine Clinical Terms) and RxNorm vocabularies from the Uniﬁed Medical Language System. The shared task used the MCN corpus created by the organizers, which maps all mentions of problems, treatments, and tests in the 2010 i2b2/VA challenge data to the Uniﬁed Medical Language System concepts. Submitted systems represented 4 broad categories of approaches: cascading dictionary matching, cosine distance, deep learning, and retrieve-and-rank systems. Disambiguation modules were common across all approaches. Results: A total of 33 teams participated in the shared task. The best-performing team achieved an accuracy of 0.8526. The median and mean performances among all teams were 0.7733 and 0.7426, respectively. Conclusions: Overall performance among the top 10 teams was high. However, particularly challenging for all teams were mentions requiring disambiguation of misspelled words, acronyms, abbreviations, and mentions with more than 1 possible semantic type. Complex mentions of long, multiword terms were also challenging and, in the future, will require better methods for learning contextualized representations of concept mentions and better use of domain knowledge.
Designing Airspace Displays to Support Rapid Immersion for UAS Handoffs

Future concepts of operations for unmanned aerial systems (UAS) will result in control paradigms whereby a single operator, or teams of operators, control multiple vehicles. This shift in control paradigms will require novel human-automation interfaces to help operators manage new demands placed on performance, workload and situation awareness (SA) as they manage task switching and handoffs between vehicles, payloads, missions, targets, and crew. A simulation experiment was conducted to compare the effects of various airspace display formats on operator workload, performance and SA. The experiment followed structured interviews conducted with U.S. Army and Air Force UAS operators in which airspace and clearance information was identified as one of the key issues for UAS operations and handoffs. Based on these interviews, a dedicated airspace transition display was proposed to support handoffs during UAS operations. Operators were tasked with taking over an ongoing UAS mission in order to evaluate four different airspace display formats: an Internet Relay Chat room window based on current military operations; a text-based transition page embedded in the Multi-Function Display (MFD); a graphics-based transition page in the MFD; and a graphical display overlaid directly onto the operators’ current map display. Objective performance data, SA data, and subjective user ratings were collected. Results indicated improved task performance and SA, as well as lower workload ratings with the dedicated airspace transition displays compared to current baseline operations, with preference by operators given to graphical (as opposed to text-based) presentation formats.
A modified Popov’s subgradient extragradient method for variational inequalities in Banach spaces

In this paper, we propose a new modification of Popov’s subgradient extragradient method for solving the variational inequality problem involving pseudo-monotone and Lipschitz-continuous mappings in the framework of Banach spaces. The weak convergence theorem of the proposed method is established without the knowledge of the Lipschitz constant of the Lipschitz continuous mapping. Finally, we provide several numerical experiments of the proposed method including comparisons with other related methods. Our result generalizes and extends many related results in the literature from Hilbert spaces to Banach spaces.
Influence of Personality Traits, Goals, Academic Efficacy, and Stressload on Final Grades in Swedish High School Students

ABSTRACT The influence of personality factors, school achievement goals, academic efficacy, and stressload of serious problems on final grades was studied by giving a questionnaire, The Perceived Stress and Control Assessment Scale, to 915 Swedish high school students. A new measure, Stressload Index, was created by extending the Control-Stress Index. Structural Equation Modeling analysis revealed that the variance in final grades was explained by four predictors, namely academic efficacy, stressload of serious problems, neuroticism, and extraversion, to 13%, academic efficacy contributing most. The effect of stressload of serious problems was shown to be negative. The influence of extraversion was negative, whereas neuroticism had a positive effect on final grades.
Numerical simulation of icing effects on static flow field around blade airfoil for vertical axis wind turbine

Abstract: Icing on blade surface of the straight-bladed vertical axis wind turbine (SB-VAWT) set in cold regions is a serious problem. To study the performance effects of icing on SB-VAWT, numerical simulations were carried out on the ice accretion on NACA 0015 airfoil which was always used for blade airfoil of SB-VAWT by CFD methods based on 2D steady incompressible N-S Equation. The morphology and procedure of icing on blade airfoil were obtained under different wind speeds, attack angles of blade and water flow flux in wind. The static flow fields, especially the static pressure fields around blade airfoil with or without icing on it were computed. The aerodynamic characteristics including the lift and drag force coefficients of blade airfoil were also calculated. The results indicated that icing caused the static pressure field changed greatly and led to the increasing of drag force and reducing the aerodynamic performance. Keywords: vertical axis wind turbine (VAWT), icing, blade airfoil, static flow field, numerical simulation DOI: 10.3965/j.issn. 1934-6344.2011. 03.041-047 Citation: Li Yan, Chi Yuan, Han Yongjun, Li Shengmao, Tagawa Kotaro. Numerical simulation of icing effects on static flow field around blade airfoil for vertical axis wind turbine. Int J Agric & Biol Eng, 2011; 4(3): 41
Call for papers: ICEAA - IEEE APWC

For pt.I see ibid., vol.50, pp.1009-14 (2003). This paper presents experimental results about the erratic erase phenomena occurring in Flash Memories with the aim of providing a deeper insight into the physical nature of the phenomenon and to deepen the comprehension of charge trapping/detrapping dynamics in tunnel oxides during Fowler-Nordheim erase. The results obtained under different operating conditions as Program/Erase cycling, Ultra Violet light exposure, thermal stress and the analysis of the erratic erase behavior varying the erasing conditions and the tunnel oxide thickness, suggested also possible methods that can be used in order to reduce the erratic erase phenomena.
Dynamic power system equivalence considering distributed energy resources using Prony analysis

Summary Power system dynamic equivalence, which has been developed to overcome the computational issues, is faced with new challenges by emerging distributed energy resources (DERs). The switching characteristic between DERs operational modes beside non-dispatchable inherent, that is, generation uncertainties, should be take into account in power system dynamic equivalencing. This paper proposes a switching-based dynamic equivalence modeling for power system considering DERs. Prony analysis is employed to fit a reduced-order model to a high-order system in frequency domain. The developed modelling strategy consists of high and low frequency equivalences. When the external system reconnects to the main network through the breaker, high-frequency equivalence is replaced with external system. This period contains 4 cycles for communication delay beside 5 cycles governor time constant, which give rises to a six-order equivalence model. Afterwards, a four-order low-frequency equivalence model is fitted to the external system in the connected grid mode. Accuracy of the fitted dynamic equivalences is investigated by calculating the mean square error between the measured signal and the Prony approximated one. A synchronous-based DER, a doubly-fed induction generators and a fuel cell DER are added to the CIGRE benchmark in order to analyse the proposed dynamic equivalence modelling. Simulation results demonstrate that the proposed equivalence modelling could exhibit the same results as the real external system in the frequency domain. Simulation results also reveal that increasing penetration of DERs affect the dynamic equivalence in grid-connected mode by degrading the higher frequencies while it has no impact on transient period equivalence. Copyright © 2014 John Wiley & Sons, Ltd.
An Open Source GPS/GNSS Vector Tracking Loop - Implementation, Filter Tuning, and Results

ABSTRACT This paper first briefly introduces the advantages of vector tracking loops (or vector lock loops - VLL) over traditional scalar tracking loops (or scalar lock loops - SLL) in a GNSS receiver. Then, some principles and the mechanism of how VLL works are illustrated. Based on an open source GPS software-defined receiver code, the VLL is implemented and tested with three different data sets including two from a GPS simulator and one from a drive test. To compare the performance, a traditional SLL is also used to process these three datasets. Their results are included. Comparisons between scalar loop and vector loop observables including carrier frequency results and position/velocity results are presented. Based on the details illustrated in this paper, one can easily understand the mechanism of the vector tracking algorithm and incorporate this in their receiver code. The tests carried out in this paper are not exhaustive but provide solid insights into the implementation and tuning associated with the vector loops. Test results show that the vector tracking loops have definite advantages over traditional scalar loops including better position accuracy and higher robustness under low signal-to-noise ratios. However, to obtain these benefits, the vector loop parameters should be carefully tuned depending on different scenarios the receiver is going through. Meanwhile, some criteria of tuning these parameters are given empirically in this work.
Identification of Preferred Sources of Information for Undertaking Studies in the Faculty of Engineering Management at Poznan University of Technology

Since 2010 a survey has been conducted among first-year students about sources of information which influence the decision of undertaking field studies in Safety Engineering, Management Engineering and Logistics in the Faculty of Engineering Management at Poznan University of Technology. The goal of these analyses is both to assess the effectiveness of promotion and also show trends in the use of diverse channels of information transfer of studies. The results of the investigation show that internet promotion via university and faculty website plays the dominant role but also direct promotion, such as opinion of older friends, is crucial. Furthermore, from year to year the analyses indicate the significant increase of official media and reveal that the prospective students rely on a few sources of information simultaneously.
Comparative Study on the Characteristics and Development Modes of International Mining Capital Market

Lack of mineral exploration capital market has become a bottleneck restricting the development of mineral exploration industry. it is meaningful to study the developing path of the mineral exploration capital market in China under the current difficult economic situation. Therefore, we should focus on the development of the capital market of mineral exploration in China, and improve the efficiency of capital allocation of mineral exploration effectively, and thus promote the development of the mining industry and the overall economy. Another important content of this paper is to compare the development of mineral exploration capital market in some industrialized countries, and to review and summarize the historical evolution of China’s mineral exploration capital market. Based on the analysis above, this paper finally analyses the obstacles and opportunities faced by China to develop mineral industry, and discusses the development path of the mineral capital market in China.