bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengembangan Media Pembelajaran Elektronika Analog & Digital Berbasis Trainer Pada Jurusan Teknik Elektro Fakultas Teknik Universitas Negeri Padang
Authors: Hidayat Sahip , Asnil Asnil
Published: November 2022

Perkembangan teknologi yang sangat pesat diera globalisasi saat ini telah memberikan banyak manfaat dalam kemajuan diberbagai aspek sosial.Penggunaan teknologi oleh manusia dalam membantu menyelesaikan pekerjaan merupakan hal yang menjadi kebutuhan dalam kehidupan.Trainer adalah kumpulan komponen dan alat sebenarnya atau pun duplikasi dari pesawat yang sebenarnya yang dapat memberikan pengalaman mempraktekkan.Pengembangan trainer ini dilatar belakangi oleh minimnya trainer pendukung mata kuliah Elektronika Analog dan Digital  serta penggunaan trainer Gerbang logika yang ada belum optimal dalam pembelajaran. Jenis pengembangan penelitian  ini adalah penelitian dan pengembangan (Research and Development). Penelitian ini merupakan penelitian pengembangan yang menggunakan prosedur penelitian Borg and Gall. Hasil kajian diperoleh bahwa validitas Trainer sebesar 88%, Praktikalitas yang dihasilkan dengan rata-rata sebesar 86% dan Uji coba terbatas terhadap 16 orang mahasiswa Program Studi S1-Pendidikan Teknik Elektro, diperoleh persentase penilaian 92 %.Trainer Gerbang Logika dikategorikan valid dan praktis digunakan dalam praktikum.
Perancangan Alat Peraga Tornis CL Untuk Menentukan Nilai Resistor
Authors: Lastya Hari Anna , Sadrina Sadrina , Chairunnisah Chairunnisah
Published: November 2022

Alat peraga adalah suatu alat yang dapat diserap oleh mata dan telinga dengan tujuan membantu guru agar proses belajar mengajar menjadi lebih efektif dan efisien. Perancangan dan pengembangan produk ini dilakukan peneliti untuk menciptakan suatu media pembelajaran terbaru yaitu alat peraga Tornis CL penentuan nilai resistor. Alat peraga ini berfungsi untuk mempermudah dalam pembacaan nilai gelang warna secara manual. Produk ini adalah produk terbaru yang dirancang dan diciptakan oleh peneliti yang berbeda dengan produk serupa lainnya. Media pembelajaran alat peraga Tornis CL sebagai penentuan nilai resistor ini layak digunakan berdasarkan hasil validasi dari ahli materi/konten, ahli media dan ahli desain, serta dilakukan revisi sesuai dengan saran/rekomendasi dari para ahli. Hasil validasi ahli materi/konten  dinyatakan sangat valid dengan jumlah skor sebesar 47 dari nilai maksimum 50 dengan persentase 94% dan  rerata skor sebesar 4,70 dengan kategori “Sangat Valid”. Serta  hasil validasi ahli media  dinyatakan sangat valid dengan jumlah skor sebesar 44 dengan persentase 88% dan  rerata skor sebesar 4,40 dengan kategori “Sangat Valid”. Dan hasil validasi ahli desain  dinyatakan valid jumlah skor sebesar 44 dengan persentase 73,33% dan  rerata skor sebesar 3,67 dengan kategori “Valid”.
Pengembangan Olfactory Hexapod Robot Untuk Mendeteksi Kebocoran Sumber Aroma
Authors: Rendyansyah Rendyansyah , Prasetyo Aditya P. P. , Exaudi Kemahyanto , Sempurna Abdul Wahid , Sudrajat Bangun
Published: November 2022

Kebocoran aroma/gas berdampak merugikan dalam dunia Industri, baik dalam skala besar maupun kecil. Gas bersifat menyebar di udara, ada yang mudah terbakar bahkan menyebabkan polusi udara di sekitar wilayah tersebut. Secara teknis diperlukan sebuah sistem untuk membantu meng-investigasi ruangan. Seperti sistem e-nose yang terintegrasi dengan robot. Di dalam penelitian ini telah dikembangkan Hexapod Robot yang terintegrasi dengan sensor pendeteksi aroma, gabungan keduanya disebut Olfactory Hexapod Robot. Motivasi dikembangkan robot ini bertujuan untuk menjelajah di lingkungan pada permukaan kasar. Adapun metode yang digunakan adalah Fuzzy Logic sebagai pengendali untuk navigasi, dan Learning Vector Quantization untuk mengetahui aroma kebocoran gas. Adapun pengujian pada robot dilakukan di dalam Skala Laboratorium, dan arena telah diatur dalam berbagai kondisi. Hasil percobaan menunjukkan bahwa Olfactory Hexapod Robot dapat ber-navigasi di dalam kondisi ruangan dan mencari sumber aroma gas. Percobaan pada robot mencari sumber gas dilakukan sebanyak 30 kali, dan tingkat keberhasilan yang diperoleh mencapai 86%.
Pengembangan Modul Pembelajaran Berbasis TEFA pada Pembelajaran Pengelolaan Bengkel Sepeda Motor Siswa Kelas XII SMK Rokan Hulu
Authors: Nitiswito Trimo , Maksum Hasan
Published: November 2022

Penelitian ini bertujuan untuk menghasilkan Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA yang valid, praktis dan efektif. Aspek yang akan dilihat adalah untuk mengetahui validitas, praktikalitas dan efektifitas Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA. Penelitian ini menggunakan metode penelitian dan pengembangan (Research and Development). Model pengembangan modul pembelajaran ini menggunakan model IDI (Instruksional Development Institute). Model IDI menetapkan prinsip-prinsip  pendekatan  sistem yang meliputi tiga tahap yaitu pendefinisian (define), pengembangan (develop) dan  evaluasi  (evaluate). Jenis data dalam penelitian ini adalah data primer yaitu data yang diperoleh secara langsung dari validator dosen,guru dan siswa melalui angket pengujian validitas, praktikalitas dan efektifitas  Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA yang dikembangkan. Instrumen pengumpul data berbentuk angket. Teknik analisis data deskriptif untuk mendeskripsikan kevalid, praktis dan efektif  Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA. Validitas Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA dilihat dari Validitas Format Modul, Validitas Materi Modul dan Validitas Penyajian Modul. Validitas Format Modul dengan nilai 0,94, Validitas Materi Modul dengan nilai  0,91 dan Validitas Penyajian Modul dengan nilai 0,925. Praktikalitas Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA dilihat dari praktikalitas guru dan siswa. Praktikalitas guru dengan nilai 96,25%, Praktikalitas siswa dengan nilai 85,17%. Efektifitas Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA dilihat dari pretest dan posttest belajar siswa yaitu pretest 54,42 dan posttest 85,00 dengan peningkatan hasil belajar sebesar 64,02%. Berdasarkan temuan penelitian ini disimpulkan bahwa Modul Pembelajaran Pengelolaan Bengkel Sepeda Motor Berbasis TEFA dilihat dari ini valid, praktis dan efektif  untuk dimanfaatkan sebagai modul pembelajaran pada Mata Pelajaran Bengkel Sepeda Motor.
Development of Digitalization Program And Establishment of Creative Economic Centers at The Nagari Assistant of UNP In Bisati Padang Pariaman District West Sumatera
Authors: Hidayati Abna , Bentri Alwen , Sunarti Vevi , Cerya Efni
Published: November 2022

The industrial revolution 4.0 and digitalization need to be addressed by all levels of government, including the nagari. Nagari or villages are the lowest centers of development and need to take this condition seriously. Obstacles in the field, the nagari does not yet have a structured program for digitizing and developing creative economy centers. The development of the Bisati Go Digital fostered Nagari program aims to help develop the economic potential of Bisati and develop a digitalization program to accelerate community economic development. Development of the assisted villages in Bisati is carried out using the village assistance method with the stages: 1) equalizing perceptions and socializing the program, 2) developing programs through mentoring village apparatus and community human resources, 3) forming a digitization committee, 4) collecting initial data on the potential of the nagari, 5) development of digitalization programs and the establishment of creative economy centers through focus group discussions. The target of the activity is the Nagari Bisati apparatus and the community of MSME actors as many as 25 people. The results of the activity have formed an equalization of public perceptions about digitalization and development of the nagari creative economy and the formation of a digitization committee and collected initial data on the potential of the nagari creative economy in the field of SMEs and tourism.Keywords: digitalization, creative economy, creative economy center
Hubungan Antara Pola Asuh Permisif Dengan Kepercayaan Diri Remaja
Authors: Yusuf Ridho Novriansyah , Sudarman Sudarman , Fitriani Annisa
Published: November 2022

Confidence is a condition about a person's beliefs that look at him positively and can reach something he wants without any doubt. This study aims to determine the relationship between permissive parenting with adolescent self confidence in SMP Negeri 35 Bandar Lampung. The hypothesis proposed in this study is that there is a relationship between permissive parenting with adolescent self confidence in SMP Negeri 35 Bandar Lampung. The subjects of this study were adolescents of class VIII at SMP Negeri 35 Bandar Lampung in the academic year 2019/2020, taken using a purposive sampling technique. This study uses a data collection method in the form of a psychological scale, namely a confidence scale of 31 items (α = 0.889) and a permissive parenting scale of 30 items (0.929). The collected data were analyzed using the product moment analysis technique from Karl Pearson assisted with SPSS 22.0 for windows. The results of data analysis showed that rxy = 0,600 with p = 0,000 (p 0.01). This shows that there is a very significant relationship between permissive parenting with adolescent self-confidence, so that the hypothesis is accepted. These results make an effective contribution of 0.360 or 36%. In other words, the permissive parenting variable contributed 36% effectiveness to the variable confidence.Keywords: Self Confidence, and Permissive Parenting
Hubungan Antara Harapan Dengan Quarter Life Crisis Pada Mahasiswa Yang Mengalami Toxic Relationship
Authors: Setiawan Nugroho Arief , Milati Alfia Zahrotu
Published: November 2022

Quarter life crisis is an emotional crisis experienced by individuals who are in the transition phase from adolescence to early adulthood (emerging adulthood). Students as individuals in their early adulthood need to have a solution in order to properly deal with this quarter life crisis period. Hope can reduce distress and foster a positive effect. The purpose of this study was to determine the relationship between hope and quarter life crisis in students who experience toxic relationships. The population in this study were students of the State Islamic University of Raden Intan Lampung. The sampling technique used is purposive sampling. The sample in this study amounted to 92 respondents. The measuring tools used are the quarter life crisis scale and the expectation scale. The analysis technique used is product moment correlation with the help of IBM SPSS ver 25 software for windows. The results showed that the majority of students were in the moderate category of quarter life crisis where women were higher than men. The expectation variable shows that the expectations that students have are mostly in the moderate category, both are in the same category. The results of the analysis show that expectations have a significant negative effect on the quarter life crisis (R= -0.431, R Square= 0.185, p 0.01), which means that the higher the expectation, the lower the quarter life crisis experienced. And conversely, the lower the expectation, the higher the quarter life crisis experienced. Judging from the value of R Square, the expectation has an effect of 18.5% on the quarter life crisis, and the other 81.5% is influenced by other variables outside the study.Key Word: Hope, Quarter Life Crisis, Toxic Relationship
Bagaimana Perbandingan Penguasaan Konsep Siswa SMP dan SMA Pada Materi Listrik Arus Searah ?
Authors: Azizah Nafilah Husnaul , Kusairi Sentot
Published: November 2022

Tujuan penelitian ini adalah untuk membandingkan penguasaan konsep siswa di dua Sekolah Menengah Pertama dan satu Sekolah Menengah Atas di Kabupaten Malang pada materi listrik arus searah. Penelitian ini  menggunakan metode deskriptif kuantitatif dengan instrumen soal berupa pilihan ganda sebanyak 10 butir soal yang diadaptasi dari Determining and Interpreting Resistive Electric Circuit Concepts Test (DIRECT). Subjek penelitian terdiri dari 33 siswa SMP dan 33 siswa SMA di Kabupaten Malang. Hasil penelitian menunjukkan bahwa ada perbedaan yang signifikan antara penguasaan konsep siswa SMP dan siswa SMA dengan kategori penguasaan konsep tergolong baik untuk siswa SMP (72,72). Siswa SMA masih tergolong dalam kategori cukup (57,27). Dari hasil penelitian yang ditemukan ada beberapa kesulitan yang dialami oleh siswa pada konsep listrik arus searah yaitu kesulitan dalam mengilustrasikan konsep medan listrik pada rangkaian listrik dan kesalahan konsep mengenai arus. Penelitian ini berguna sebagai referensi untuk peneliti yang lain dalam melakukan penelitian tentang penguasaan konsep siswa sekolah menengah.
Realigning practices of care and environmental governance: findings and reflections from a transdisciplinary research project in Wales (UK)
Authors: Giambartolomei Gloria , Franklin Alex , Fried Jana
Published: November 2022

This article presents This article presents findings from a transdisciplinary research project on collaborative practices for the sustainable management of natural resources (SMNR) in Wales. Here, the legislation establishes that the national well-being agenda and the principle of SMNR in environmental governance must be achieved through collaborative and participatory practices, across sectors and organisations, including within the public sector. However, neoliberal and hyper-bureaucratic governance structures, characterized by a risk-adverse nature, do not allow public sector institutional actors to experiment and engage with such practices in their everyday work. This article discusses a collective experience of reflecting on, and challenging such oppressing neoliberal structures, through experimenting with alternative ways of doing and being together. The emerging community at the heart of this experience is composed of policymakers, practitioners, artists, and academics (including the authors), who together carved out a 'site of negotiation' to contest techno-managerialism and mere rational approaches to (natural resources) governance. In the course of this research, these actors began to collectively create and shape new and shared meanings of doing collaborative and cross-boundary work (as required by the Welsh legislation), based on relationships of trust, reflexivity, embodiment, and relationality. Reflecting also on our own experience (and interpretation) of working alongside them, we believe that such emergent processes of collective meaning-making have the potential to transform neoliberal (environmental) governance structures into 'lived' and 'owned' institutions. Inspired by relational, integrative and caring forms of democratic governance, we argue that professionals in public sector organisations can realign governance structures in ways that meet the challenge of enabling the rapid and wide sustainability transformations that are so desperately needed.
Optimisation of construction mode of residential houses based on the genetic algorithm under BIM technology
Authors: Liu Sufang , Shi Lei , Liu Simian , Wang Chuan
Published: November 2022

BIM technology is a breakthrough in the construction industry whose application is of great value, and the engineering design, engineering budget and cost control combined with BIM technology have been developed rapidly. Therefore, in this paper, BIM technology is adopted to optimise the construction mode, and the genetic algorithm is selected to solve the scheduling model of construction. By applying an interdisciplinary research method combined with computer science and technology, an intelligent optimisation model of construction can provide a new research perspective and technical method for the development of the construction industry.
Analysis of the Supplier Relationship Management Function and Activities
Authors: Ungureanu Cristina-Elena
Published: November 2022

The main purpose of this article is to give an overview on the research conducted in the area of “supplier relationship management” in the industrial engineering field. To this overview, three main areas will be addressed. First, the evolution of the “supplier relationship management” function from being a technical knowledge broker across a business unit or organisation, to acting as a facilitator for the business’ strategic decision which need to be taken primarily within the supply chain management area. Second, how to set up a supply chain management governance system and what to consider for this system, in order to optimize the relevant activities and provide the expected supplier qualitative results. And finally, review on a set of tools and techniques for the supplier relationship management area, which, if implemented and used accordingly, can generate both short- and long-term benefits for its impacted stakeholders.
A Review on Tribological Behaviour of 3D Printed Mechanical Components
Authors: Macovei Gheorghe , Paleu Viorel
Published: November 2022

Technologies such additive manufacturing are slowly becoming more and more present on the market, covering different areas of the industry due to its great potential. Even so, there are still many aspects which are unexplored or which can be improved. One of them being the study of the tribological proprieties for all these parts, which are produced through additive manufacturing methods, such as powder bed fusion, binder jetting, direct energy deposition, fused filament fabrication, material jetting, vat photopolymerization, and sheet lamination. The scope of this paper is to bring together the tribological proprieties for the 3D printed parts, and to have a critical analysis of these proprieties, in order to easily decide which printing method is suitable, depending of the working conditions of the printed component. In addition, this paper will describe the working principle for each technology, and the type of materials that are commonly used in the printing process. Depending of the printing method, the tribological proprieties vary greatly. For example, for the parts which are manufactured through powder bed fusion, it was found that the wear resistance is higher, and with a lower friction coefficient than for a part manufactured through traditional methods. In addition, for many printing methods, the produced part might require an additional step of treatment. This is the case with binder jetting, where infiltration and sintering are often used because the 3D-printed part is porous and weak. Some researchers found that the average friction coefficient measured for a steel-based part, treated with bronze infiltration, is comparable with the friction coefficient measured on a part made of the same material, manufactured through the direct energy deposition method. Of course, due to the physical limitations of the 3D printing method, the system will allow only the usage of a specific type or class of materials. One of such method is fused filament fabrication, where only thermoplastics are used. Along with vat photopolymerization and material jetting, these methods present comparable tribological proprieties.
A Study on the Dynamics of an AC Induction Motor Rotor Based on the Analysis of Free Response at Impulse Excitation
Authors: Bumbu Neculai Eduard , Horodincă Mihăiţă
Published: November 2022

This paper focuses on a topic frequently involved in the dynamics of transient phenomena on rotary machines driven by an AC induction motor supplied by a three-phase four-wire electrical system: the free response of the dynamic system mirrored in the torsional vibrations of its rotor. This dynamic system is reducible at a single degree of freedom system, equivalent of a spring-mass-damper but as a torsional vibratory system composed of the motor rotor (having a moment of inertia) the rotating magnetic field (having a torsional stiffness) and a hypothetical damper (generating a viscous damping mainly due to the air friction). This free response is useful mostly to characterize the transmissibility related to the conversion of information from mechanical to electrical power through this dynamic system. A simple computer-assisted setup is used to describe indirectly and to analyze the free response (generated when the motor is switched-on or after star to delta commutation sequence), using the active electrical power absorbed by the motor.
Research on the Maintenance of Common-Rail Injectors
Authors: Crăciun Ioan , Dumitraş Cătălin Gabriel
Published: November 2022

The presented paper develops a practical maintenance procedure in the case of injectors, including the necessary steps. It is important to analyze the engine control parameters, the injection, the engine behavior in specific given conditions. By using the maintenance equipment to check the injectors that are electronically operated, we can observe certain variations of them, such as operating parameters, actual and nominal operating values. We performed the maintenance of the injectors, measuring the amount of diesel eliminated on the return, from here observing a disproportionality between the quantities. The accomplishment of this paper leads to an objective that highlights the problems related to the behavior of the supply system and implicitly, problems that can occur at the injectors that use the Common - Rail supply system.
CFD Analysis of a Round Shaped Air Cushion Vehicle with Flexible Skirt Segments at 90° Part I: Different Positions of Bag to Cushion Feed Orifice
Authors: Pavăl Mihai-Silviu , Popescu Aristotel , Zahariea DănuȚ
Published: November 2022

Air cushion vehicles represent an interesting research area, mainly from their application point of view. But, at the same time, represents the reason of the scarcity of published results. Based on a series of initial simulations carried out by authors, which analysed lift forces for a round-shaped air cushion vehicle where the segments of the flexible skirt were inclined at 90˚, it was decided to carry out more complex studies regarding this configuration, presented in a series of articles. This complex study consists in performing static CFD simulations, in which values for different constructive elements are modified in order to analyse their influence on lift force. In this first article, the imposed fixed parameters are: angle of inclination of the segments of the flexible skirt and height of the segments, respectively. The main constructive variable parameters are: air clearance height and length between the edge of the bag to cushion feed orifice and inner wall of the flexible skirt segments. The simulations were carried out in ANSYS Fluent software, where velocity contours, streamlines and velocity profiles from the exit under the flexible skirt were analysed and through Curve Fitting Toolbox application found in MATLAB program, the equations were established that describe lift force variation.
Influence of the Condition of the Railway Superstructure on Traffic Noise on the Regional Line
Authors: Pultznerová Alžbeta , Mečár Martin , Šestáková Janka , Hodás Stanislav
Published: November 2022

Most of the railway lines in Slovakia were built in the second half of the 19th century, or until 1918 (the establishment of Czechoslovakia). Except for the post-World War II period, when approximately 71 % of the Slovak lines had to be renewed, limited funds have been spent on repair and reconstruction works on the lines located in the Slovak territory [1]. Nowadays, there is an effort to modernize the main railway lines but also to revamp the local lines. This is also a case of the line section Poltár - Utekáč, where in the near future a sleeper, which is in very poor technical condition, will be replaced by a Y-type sleeper. On this occasion, the impact of the new structure on the noise emission from the sleeper should also be assessed.
Optimization of Red Sand Particle Size and Composition in Mixture with Ordinary Sand to Enhance Concrete Quality
Authors: Harahap Mukti Hamjah , Ritonga Winsyahputra , Irfandi Irfandi , Zubir Moondra
Published: November 2022

In this study we determined the effect of variations in composition and particle size of Red Sand (RS) grains on the quality of concrete. Concrete was prepared as cubes of 15 cm3 with a composition of cement, sand and gravel in a ratio 1:2:3 and water to cement ratio of 0.5. Variations of RS (fine aggregate) composition are 0 %, 5 %, 10 %, 15 %, 20 % of the weight and red sand grain particle size were prepared as 80 mesh, 100 mesh, 120 mesh. Mechanical properties of the maximum concrete pressure strength test at a composition of 5 % along with a decrease in the size of the red sand grain size of 100 mesh and 120 mesh RS 100-5 and RS 120-5 with pressure forces of 35.4 MPa, and 35.5 MPa, respectively. On the other hand, the red sand with 80 mesh grain size have maximum pressure force in a composition 10 % RS 80-10 is 34.6 MPa. It is considered the addition of red sand fine aggregate has an impact on improving the quality of concrete.
Location of Photovoltaic Panels in the Building Envelope in Terms of Fire Safety
Authors: Iringova Agnes
Published: November 2022

The increasing amount of energy consumed by the operation of buildings results in an increasing environmental burden. This has a direct impact on the innovation of renewable energy technology and its application in building industry. In accordance with the requirements of the “Europe 2020 Strategy” and “Europe 2030 Project”, the long-term goal is to achieve the maximum use of renewable energy sources in the buildings´ operation. One of the solutions is the building-integrated photovoltaic power plant. The paper analyses efficiency and incorporation of photovoltaic (PV) systems into the roofs and perimeter walls. PV systems are a renewable energy source used in the construction of zero energy buildings producing minimal environmental pollution. Semi-transparent building-integrated photovoltaics (BIPV) are one of the technologies that have the potential to increase the building´s energy efficiency as well as aesthetically complete the building´s design. The paper deals with material characteristics of PV panels in terms of the fire risk and definition of the fire hazardous area that arises during their combustion. It is focused on the incorporation of various types of PV technology into the facades and roofs, structural and material solutions of fire-dividing structures to which PV systems are fastened considering their location in the fire hazardous area. Based on the external fire simulations, conclusions in this paper bring the optimal position of PV systems in the building envelope in relation to fire open areas, fire lines and fire hazardous areas. The safety of firefighters during the intervention also depends on the position of PV systems. The case study presented in this paper uses a model solution to give the optimal position of PV systems in the building envelope considering the fire safety.
Novel Methodology for Determining the Mechanical Characteristics of Coarse-Grained Soils
Authors: Ardouz Ghizlane , Baba Khadija , Bouanani Latifa EL , Latifi Fatima ezzahraa , Dardouch Asmaa
Published: November 2022

Coarse-grained soils are a type of soil frequently found in civil engineering projects, and their mechanical characterization still presents a real challenge. They are composed by elements of different dimensions (from a few microns to tens of centimeters), and can be of very varied nature (clay, sand, gravel, pebbles, etc.). The mechanical characterization of coarse-grained soils is very difficult because of the presence of large elements. In order to be able to characterize them in the laboratory by means of conventional size devices, it is very important to study the influence of significant parameters on the mechanical behavior of coarse-grained soils (the volume fraction, particle size distribution and spread, consolidation level and initial state of the matrix), using the large-sized triaxial testing device. In this paper, we will propose a methodology for evaluating the mechanical characteristics of coarse-grained soils based on soil granulometric reconstruction procedures. The method we have named GALA is based on the use of polynomial correlations between the strength increase due to inclusions and the volume fraction fv
and the particle spread (d
min
/d
max) of inclusions. We were able to apply this new method to a natural soil. The results showed the relevance of our method.
Indoor Environment, Lighting Conditions and Productivity in the Educational Buildings
Authors: Krawczyk Natalia , Dębska Luiza
Published: November 2022

The main aim of the research is to assess the light intensity and its impact on the productivity of research participants in educational buildings. The research was carried out in 18 rooms in teaching buildings in Poland and involved over two hundred volunteers. The tests were carried out with the following climate parameters: air temperature ranged from 20 to 25.1 °C, relative humidity from 18.16 to 50.9 %, and the concentration of carbon dioxide from 509 to 1634 ppm. The light intensity in the tested rooms ranged from 17.3 to 1095.1 lux. The parameters of the room temperature, carbon dioxide concentration, relative humidity and light intensity were recorded using a microclimate meter. The study participants were asked to answer questions about overall well-being, lighting quality, and productivity in each room. The results show that the air temperature has an effect on the productivity of the participants with the most preferable range of about 22 – 24 °C. It was also observed that productivity increased with improved well – being of the respondents. The analysed research also made it possible to check whether the users were satisfied with the light intensity. 74 % of respondents assessed that with the prevailing lighting, their productivity is normal, and they also felt best in rooms where the light intensity was 200 - 400 lux.
Prediction of Geopolymer Concrete Compressive Strength Utilizing Artificial Neural Network and Nondestructive Testing
Authors: Almasaeid Hatem , Alkasassbeh Abdelmajeed , Yasin Bilal
Published: November 2022

A promising substitute for regular concrete is geopolymer concrete. Engineering mechanical parameters of geopolymer concrete, including compressive strength, are frequently measured in the laboratory or in-situ via experimental destructive tests, which calls for a significant quantity of raw materials, a longer time to prepare the samples, and expensive machinery. Thus, to evaluate compressive strength, non-destructive testing is preferred. Therefore, the objective of this research is to develop an artificial neural network model based on the results of destructive and non-destructive tests to assess the compressive strength of geopolymer concrete without needing further destructive tests. According to the artificial neural network analysis developed in this study, the compressive strength of geopolymer concrete can be predicted rather accurately by combining the results of the non-destructive with R
2 of 0.9286.
Enhancing the Structural Analysis of Rc Piled - Raft Foundation by Actual Behaviour of Supporting Piles
Authors: Al-Zuhairi Alaa H. , Abdualrahman Safaa Q. , Hanoon Ammar N. , Abdulhameed A. , Taj Ali I. , Al Zand Ahmed W.
Published: November 2022

This paper presents a numerical analysis of the piled-raft foundation (PRF) based on the actual behavior of supporting piles. The raft was modeled as a thin plate, while the piles were modeled as springs in different ways. This research also aims to propose an analytical model of piles based on actual behavior at fieldwork. The results proved that the structural behavior of raft member can be improved through utilizing the actual behavior of supporting piles. When the piles were modeled as non-linear stiffness springs, settlements and bending stresses of raft foundation were reduce marginally as compared with those obtained from piles with linear stiffness springs.
Noise Annoyance and Sleep Disturbance in New Buildings in Bratislava
Authors: Argalasova Lubica , Mihalcik Ladislav , Pultznerova Alzbeta , Simonovic Jan , Matejakova Lenka , Samohyl Martin , Hirosova Katarina , Babjakova Jana , Jurkovicova Jana
Published: November 2022

Annoyance and sleep disturbance are the most common community responses to road traffic noise, and they account for the majority of the environmental noise burden in Europe. The findings of a cross-sectional study - a questionnaire survey of residents living in newly built apartment houses in some Slovak towns (Bratislava, Trencin, Martin, Piestany) are presented in this paper. The average age of the 543 respondents was 45 ± 4 years, 53 % were females, and 81 % had lived in their current home for more than five years. Traffic noise measurements on noisy facades LAeq,day
= 51.8 dB to 72.4 dB, LAeq,night
= 41.9 dB to 64 dB were supplemented by a standardized questionnaire. In comparison to respondents with bedroom windows facing quiet streets, those who face noisy streets are less satisfied with their quality of life, less sensitive to noise, and more irritable and restless during the day and night OR = 2.54; 95 % CI = 1.38-4.92. After the results have become completed, we hope to suggest temporary solutions for noisy apartment building facades, as well as intervention techniques, and to apply sound city planning principles.
Experimental Comparison of Fibers and Nanomaterials in Compression Test and Cost of High Strength Concrete in Egypt
Authors: Al-Hamad Ezzat Gazy , Ragab Ahmed Mahmoud , Elattar Mohamed Mohsen , Sadek Dina Mahmoud
Published: November 2022

The present work addresses conducting an experimental comparison between different types and dosages of fibers and nanomaterials in compressive tests and the cost of mixes for high-strength concrete (HSC). This study investigated the materials used in the construction sector in Egypt. The experimental work was carried out to select the optimum percentage of each type of the used nanomaterials, and fibers to achieve the highest compressive strength and low cost. In this work, nineteen concrete mixes were prepared. Nano silica (NS) and nano clay (NC) were used at 0, 1, 2, and 3 % by weight of cement. Also, nano- fumed silica (FS) was used at 0, 1, 2, 3, 5, and 10 %, while silica fume (SF) was used at 10 % by weight of cement. Each type of corrugated round steel fiber (STF), and polypropylene fibers (PPF) were used at 0.5, 0.75, and 1.00 % by concrete volume. The results indicated that the compressive strength of the HSC increases as the percentage of adding nano-fumed silica increases up to 3 % and the economic feasibility of nano-fumed silica in concrete is better than in other nanomaterials such as nano silica and nano clay. Also, using 1 % steel fiber in HSC increases concrete strength significantly compared to conventional concrete without considerably increasing the cost.
Verification of Precast Concrete Girder Bridge Under Static Load
Authors: Bujnakova Petra , Kralovanec Jakub , Perkowski Zbigniew , Bouchair Abdelhamid
Published: November 2022

Large-scale construction of transport infrastructure inevitably includes the construction of new bridges. During the design process, many assumptions and simplifications are taken into account. Therefore, the verification of the structural response of new bridges is necessary. One of the possible tests of structural response is a proof-load test which can detect certain problems of investigated structures. The paper introduces numerical and experimental analysis of the new bridge, which is located on Slovak Highway D1, section Hricovske Podhradie – Lietavska Lucka. The verified bridge is a four-span continuous structure with a total length of 129.4 m. The bridge is a representative of typical precast girder bridges adopted for construction of Slovak highways. The superstructure consists of eight post-tensioned precast I-beams. During a load test, predicted structural response was verified to check for any unusual behaviour. Finally, recorded data was summarised and report was distributed to all subcontractors and bridge owner. This information may help in further bridge management program.
Food supplements in Poland in context of issues related to their safety as food
Authors: Baraniak Justyna , Kania-Dobrowolska Małgorzata , Kujawski Radosław
Published: November 2022

In Poland, food supplements have been popular among consumers for many years. Their sale brings producers huge profits. The interest in these products, especially in vitamin and mineral preparations and in immunity-supporting products increased dramatically due to the COVID-19 pandemic. Self-medication with untested dietary supplements may be health hazardous. Since in Poland and in other countries the procedures of quality control of food supplements are imperfect, this situation raises serious concerns about the risks of their unrestricted use and food fraud. The article briefly presents important problems in the safety of food supplements from the point of view of experts involved in their evaluation.
Steady, Aim, Fire! Optimized Instructions Enhance Performance and Reduce Intra-Trial Variability in a Shooting Task
Authors: Abdollahipour Reza , Land William , Bizovská Lucia , Klein Tomáš , Valtr Ludvík , Janura Miroslav
Published: November 2022

The present study examined the influence of the individual and sequential combination of the key components of OPTIMAL (Optimizing Performance Through Intrinsic Motivation and Attention for Learning) theory (i.e., enhanced expectancies, autonomy support, and external focus), on the performance of a laser-pistol shooting task. In addition to shooting accuracy, intra-trial variability in the sway of forearm/pistol motion prior to movement execution (pulling the trigger) was the primary variable of interest. In a between-within-subject design, thirty-six participants (Mage = 21.27 ± 1.75 years) were randomized into either a control or an optimized group. Enhanced expectancies, autonomy support, and an external focus were implemented via sequential blocks of trials for participants in the optimized group. Participants in the control group performed all trials under “neutral” conditions. Our results showed that motor performance was enhanced for participants in the optimized group compared to those in the control group. Moreover, greater reductions in forearm sway leading up to the trigger pull were observed for the optimized group compared to the control group. These findings suggest higher movement effectiveness and efficiency, potentially through better attunement to task and environmental constraints, when implementing optimized instructions in a self-initiated fine motor task.
Game Demands of a Professional Ice Hockey Team with Special Emphasis on Fatigue Development and Playing Position
Authors: Rago Vincenzo , Muschinsky Adrian , Deylami Kasper , Vigh-Larsen Jeppe , Mohr Magni
Published: November 2022

The aim of this study was to describe the game activity profile of a professional ice hockey team with special emphasis on fatigue development and playing position. Data were collected using a wearable 200-Hz accelerometric system and heart rate (HR) throughout eight official games in a professional ice hockey team (6 defensemen and 11 forwards; n = 122 files). On-ice 10- and 30-m sprint performance, repeated sprint ability and HR responses to the submaximal Yo-Yo Intermittent recovery level 1 test were assessed to determine associations with game performance. Although the 3rd period was largely longer than the 1st and 2nd periods (r = 0.56–0.59), no differences were observed between periods in activity pattern, except a moderate decline in the number of decelerations <-2 m·s-2 per min (Dec2/min) in the 2nd period for forwards (r = 0.06–0.60). Mean HR, time spent >85% HRmax (t85HR), as well as the total number of intense accelerations and decelerations were higher for defensemen. However, demands were similar when expressed relative to time on-ice, except that defenders performed more Dec2/min than forwards in all periods, whereas forwards spent more t85HR during the 2nd period (r = 0.46–0.57). Time spent on ice was inversely correlated with the total number of accelerations (Acctot), accelerations >2 m·s-2 per min (Acc2/min), total decelerations per min (Dectot/min), Dec2/min and t85HR (r = -0.63 to -0.18) and positively correlated with mean HR and peak HR (r = 0.20– 0.53). No significant correlations were found between physical fitness and game activity variables scaled by individual time on ice. Absolute acceleration and HR demands of professional ice hockey seem to differ between playing positions, but not in relation to time on ice. Further, no clear signs of fatigue were captured, possibly due to the longer duration of rest intervals in the 3rd period.
The Large and Strong Vortex Around the Trunk and Behind the Swimmer is Associated with Great Performance in Underwater Undulatory Swimming
Authors: Tanaka Takahiro , Hashizume Satoru , Kurihara Toshiyuki , Isaka Tadao
Published: November 2022

Swimmers can produce horizontal body velocity by generating and shedding vortices around their body during underwater undulatory swimming (UUS). It has been hypothesized that the horizontal shedding velocity, area and circulation of the vortex around the swimmer’s body are associated with UUS performance. The purpose of this study was to investigate whether the shedding velocity, area and circulation of vortices around swimmers’ bodies are correlated with the horizontal body velocity during UUS. Computational fluid dynamics (CFD) was conducted to obtain the vortex structure during UUS in nine male swimmers. Morphological and kinematic data of each subject were obtained and used to reconstruct the UUS movement on CFD. The horizontal velocity of the center of vorticity, the area and circulation of vortices around the ventral side of the trunk, dorsal side of shoulder and waist, and behind the swimmer were determined from the simulation results. Positive correlations were found between the vortex area and circulation around the ventral side of the trunk (area r = 0.938, p < 0.05; circulation r = 0.915, p < 0.05) and behind the swimmer (area r = 0.738, p < 0.05; circulation r = -0.680, p < 0.05), and the horizontal body velocity. The horizontal shedding velocity of the center of vorticity of the vortices around the swimmer’s body was not significantly correlated with the horizontal body velocity. These results suggest that the generation of a large and strong vortex around the trunk and behind the swimmer is associated with great UUS performance.
Differences in the Contractile Properties of the Biceps Femoris and Semitendinosus Muscles Throughout a Season in Professional Soccer Players
Authors: Fernández-Baeza Daniel , Diaz-Ureña Germán , González-Millán Cristina
Published: November 2022

The aim of this study was to monitor seasonal changes in the mechanical and neuromuscular characteristics of the knee flexor muscles with tensiomyography, the biceps femoris (BF) and semitendinosus (ST) muscles, of 27 soccer players. All male professional soccer players (age 25 ± 4 years) were measured at the beginning of the preseason (second week) and in the competitive season (10 weeks later). The variables contraction time (Tc) and muscle displacement (Dm) showed significant differences in some muscles, and in others they indicated a tendency to change. In general, the BF improved (more explosive and better muscle tone) and the ST worsened (slower and worse muscle tone) its values during the season. The findings of this study suggest that usual daily soccer training and weekly competition might produce antagonistic changes between the knee flexor muscles.
Treatment of Jumper’s Knee with Extracorporeal Shockwave Therapy: A Systematic Review and Meta-Analysis
Authors: Stania Magdalena , Król Tomasz , Marszałek Wojciech , Michalska Justyna , Król Piotr
Published: November 2022

The aim of this systematic review and meta-analysis was to determine the therapeutic efficacy of extracorporeal shockwave therapy (ESWT) for athletes with patellar tendinopathy. We searched PubMed, EBSCOHost and Ovid for randomized controlled trials (RCTs) which evaluated the therapeutic efficacy of ESWT in athletes with jumper’s knee. The methodological quality of RCTs was rated with the Physiotherapy Evidence Database scale. Data in the meta-analysis were expressed as standardized mean difference (SMDs) and 95% confidence intervals (CIs). Heterogeneity was assessed with I2 statistics. Of 192 records identified, a total of seven articles met the inclusion criteria. The ESWT and control groups with any other conservative treatment did not differ significantly with respect to the Visual Analogue Scale (VAS) long-term scores obtained at ≥ 6 months of therapy completion (SMD: -0.33; 95% CI: -4.64 to 3.98; p = 0.87; I2= 98%). Furthermore, no significant differences were found between the ESWT and control groups regarding the pooled Victorian Institute of Sports Assessment for Patella (VISA-P) scores for long-term outcomes (SMD: 8.21; 95% CI: -39.3 to 55.73; p = 0.73; I2= 99%). The ESWT and control groups did not differ significantly on the VAS and VISA-P scores for long-term outcomes. In both cases, heterogeneity was considered to be high. Hence, no clear and generalized conclusions can be drawn regarding ESWT effectiveness in athletes with patellar tendinopathy.
Predicting Time to Take-Off in a Countermovement Jump for Maximal Quickness From Upright and Squat Starting Positions
Authors: Amasay Tal , Suprak David
Published: November 2022

A countermovement jump (CMJ) is common in sport and often time-constrained. Little is known about contributors to quickness in jumps. This study examined effective predictors of time to take-off and effects of the starting position on reaction time and take-off time in a countermovement jump performed for quickness from upright and squat positions. Forty-nine collegiate athletes performed CMJs for quickness from upright and squatting starting positions to 75% of their maximal jump height. Several variables were calculated from the kinetic data related to jump performance. Correlation and multiple regression were used to determine variables related and predictive of time to take-off under both conditions. Paired t-tests evaluated differences in reaction and take-off times between conditions. In the upright condition, an increasing rate of force development and force, and decreasing time variables, impulses, and countermovement depth were associated with shorter time to take-off. The time to take-off prediction included rates of force development, force, time, and impulse. In the squat condition, shorter time to take-off was associated with lesser time variables, eccentric impulse, force at the end of the eccentric phase, and countermovement depth, and a greater rate of force development, concentric impulse, peak power, peak force, and reaction time. The time to take-off prediction equation included time to the bottom of the countermovement, time to peak force, and peak power. Reaction and take-off times were longer in the upright condition. Quick jump efficiency may be improved by strategies to increase maximum strength and the eccentric rate of force development while decreasing countermovement depth and time to bottom.