bluuebunny/crossref_metadata_2025 huggingface dataset:
PERSEPSI SISWA MENGENAI PEMBELAJARAN PDTM DALAM MASA PANDEMI COVID-19 KELAS X TEKNIK PEMESINAN SMK NEGERI 5 PADANG
Authors: Anggriyanto Steven Thomas , Indrawan Eko , K Arwizet , Syahri Budi
Published: June 2022

Dunia pendidikan sekarang ini sedang mengalami keterpurukan yang disebabkan oleh pembelajaran yang dilakukan secara daring atau dalam jaringan karna pandemi Covid-19. Banyak siswa yang mengeluhkan atau tidak paham terhadap materi yang disampaikan oleh guru. Salah satu permasalahan yang dialami yaitu pada mata pelajaran PDTM. Masalah dalam penelitian ini adalah tentang persepsi siswa mengenai pembelajaran PDTM dalam masa pendemi Covid-19 kelas X Teknik Pemesinan SMK Negeri 5 Padang, sehingga perumusan masalah dalam penelitian ini yaitu bagaimana persepsi siswa mengenai pembelajaran PDTM dalam masa pendemic covid-19 kelas X Teknik Pemesinan. Penelitian ini bertujuan untuk melihat persepsi siswa pada pembelajaran PDTM. Penelitian ini didasari observasi peneliti pada masa pandemi Covid-19 untuk mencari tahu persepsi siswa pada pelajaran tersebut. Penelitian ini termasuk metoda deskriptif  dengan pendekatan kuantitatif. Penelitian ini mengumpulkan data dengan menggunakan kuesioner (angket penelitian). Penelitian dilakukan di SMK Negeri 5 Padang menggunakan teknik Porpuse Sampling pada kelas X TPM. Hasil penelitian diperoleh Pada variable persepsi didapatkan nilai persentase dari hasil data angket dengan sampel sebanyak 67 responden 19 item pernyataan dengan skor 1-5, capaian responden didapatkan nilai sebesar 74%. Persepsi siswa mengenai pembelajaran PDTM dalam masa pandemi covid-19 dapat dikategorikan Cukup dengan melihat hasil persentase dari capaian responden yang di dapat melalui angket.
SIMULASI DAN ANALISIS KEKUATAN PEMBEBANAN FRAME PADA PERANCANGAN MESIN PRESS BEARING MANUAL HYDRAULIC JACK MENGGUNAKAN AUTODESK INVENTOR
Authors: Attorik Al Afif , Ambiyar Ambiyar , Sari Delima Yanti , Rahim Bulkia
Published: June 2022

Mesin press merupakan suatu mesin yang beoperasi untuk menghasilkan tekanan tinggi pada suatu objek. Sumber tenaga dapat berasal dari mesin hidrolik, tenaga manusia, motor listrik dan hal lainya. Penelitian ini diangkat dari masalah yang terjadi pada frame atau rangka mesin press bearing hidrolik manual yang mengalami bending yang cukup parah pada bagian rangka atas (head support) yang dapat merusak kerangka mesin dan adanya beban (force) yang belum diketahui yang diterima oleh frame mesin press sehingga frame tersebut mengalami bending. Maka dilakukan perancangan ulang dalam bentuk desain gambar yang bisa dianalisis kekuatan dan tegangan yang terjadi pada frame tersebut yang memungkinkan peneliti bisa mengetahui nilai beban yang aman dipakai untuk frame tersebut. Penelitian ini bertujuan untuk mengungkapkan nilai dari tegangan yang terjadi pada frame dan nilai keamanan yang diperoleh dari hasil perancangan struktur rangka mesin press berupa gambar teknik dan analisa kekuatan struktur. Penelitian ini dibatasi dengan pemuatan 20 Ton. Penelitian ini mengkaji desain, simulasi dan analisis tegangan struktur rangka mesin press bearing hidrolik manual kapasitas 20 Ton dengan menggunakan metode elemen hingga atau bisa dikatan juga seagai Finite Element Analisis (FEA). Material yang digunakan adalah Stell Mild. Analisis elemen hingga dilaksanakan dengan sistem numerik menggunakan peragkat lunak Autodesk Inventor Professional 2021. Hasil dari simulasi dan jug analisis yang telah dilakukan menunjukkan bahwa struktur rangka mesin press bearing memiliki tegangan, deformasi, massa, dan faktor keamanan sebesar 0,7854 MPa, 0,002533 mm, 75.362 kg, dan 15.
EFEKTIFITAS PELAKSANAAN PRAKTEK KERJA INDUSTRI SISWA SMK NEGERI 1 BATIPUH
Authors: Vananda Rizki , Lapisa Remon , Aziz Abdul , Purwantono Purwantono
Published: June 2022

Sekolah Menengah Kejuruan memiliki peran dalam menyiapkan serta meningkatkan kualitas peserta didik dengan cara melaksanakan program Praktek Kerja Industri. Praktek kerja industri adalah salah satu sistim pembelajaran yang dilaksanakan diluar metode pembelajaran di sekolah dan diterapkan pada perusahaan/industry. tujuan penelitian ini adalah mendeskripsikan efektifitas pelaksanaan praktek kerja industri siswa SMK Negeri 1 Batipuh. Jenis penelitian yang digunakan dalam penelitian ini adalah penelitian deskriptif yang bertujuan mengetahui efektifitas pelaksanaan praktek kerja industri siswa SMK Negeri 1 Batipuh. Populasi penelitian ini adalah siswa kelas XII Teknik Pemesinan, Guru pembimbing praktek kerja industri di SMK Negeri 1 Batipuh, dan dunia usaha/dunia industri tempat siswa melaksanakan praktek kerja industri dengan total sampel penelitian sebanyak 45 responden. Instrumen yang digunakan dalam mengumpulan data pada penelitian ini adalah kuesioner. Hasil penelitian yang dilakuakan dapat diketahui bahwa pelaksanaan praktek kerja industry siswa SMK Negeri 1 Batipuh dapat dikatakan efektif dikarenakan nilai rata-rata/mean tertinggi pada angket siswa terdapat di sub-variabel penilaiaan aktivitas prakerin sebesar 3,3, nilai terendah terdapat pada sub-variabel pelaksanaan yaitu 3,04, Pada angket guru pembimbing terdapat nilai mean tertinggi pada sub-variabel pelaksanaan prakerin sebesar 3,4, nilai terendah terdapat pada sub-variabel penilaian yaitu 2,7 sedangkan pada angket dunia usaha/dunia industri terdapat nilai mean pada sub-variabel pengawasan prakerin sebesar 3,4, nilai terendah terdapat pada sub-variabel perencanaan yaitu 2,9.
HUBUNGAN DISIPLIN PEMBELAJARAN DARING DENGAN HASIL BELAJAR PADA MATA PELAJARAN PDTM KELAS X DI SMK NEGERI 1 PADANG
Authors: Afif Alhamda , Refdinal Refdinal , Purwantono Purwantono , Primawati Primawati
Published: June 2022

Masa pandemic corona virus mengharuskan pelaksanaan pembelajaran di sekolah dilakukan secara daring atau jarak jauh. Sekolah SMK N 1 Padang telah melaksanakan pembelajaran jarak jauh selama masa pandemi. Siswa kelas X tetap membutuhkan kedisiplinan dalam belajar agar pelaksanaan pembelajaran jarak jauh dapat berjalan efektif. Alat ukur keberhasilan siswa dalam mengikuti kegiatan belajar ditunjukan dari prestasi belajar. Semakin baik disiplin siswa terhadap pembelajaran daring maka hasilnya akan semakin baik juga terhadap keberhasilan prestasi belajar siswa tersebut. Tujuan penelitian ini mendeskripsikan disiplin dan hasil belajar serta mengetahui tingkat hubungan antara kedua variabel tersebut. Populasi berjumlah 71 siswa dari kelas X jurusan Teknik Permesinan dan anggota populasi menjadi sampel keseluruhan atau disebut total sampling. Penelitian ini menggunakan metode penelitian kuantitatif yang bersifat korelasional. Data dari variabel dependent didapati melalui Angket (Questionnaire) dan rata-rata nilai soal tes yang peneliti berikan. Analisis data penelitian menunjukan disiplin belajar berada pada kategori tinggi dengan nilai rata-rata sebesar 98.41 dan hasil belajar di kategori sedang dengan nilai rata-rata sebesar 87.94. Output SPSS menunjukan nilai Corralate (r) atau rhitung sebesar 0,237>0,230 rtabel dan nilai signifikan diperoleh 0,47 pada taraf 5%. Artinya adanya hubungan positif dan signifikan antara variabel disiplin belajar dan variabel hasil belajar selama pelaksanaan pembelajaran daring dan berada pada tingkat korelasi yang rendah.
PENGARUH PENGGUNAAN MEDIA PEMBELAJARAN BERBASIS POWER POINT DENGAN VIDEO DAN ANIMASI TERHADAP HASIL BELAJAR PADA MATA KULIAH FABRIKASI
Authors: Haq Hafizil , Purwantono Purwantono , Irzal Irzal , Rahim Bulkia
Published: June 2022

Belum digunakannya media pembelajaran yang lebih imajinatif yang dapat membangun inspirasi dan hasil belajar mahasiswa sehingga sistem pembelajaran belum sepenuhnya terlaksana dengan baik. Hasil belajar yang belum maksimal dikarenakan kekurangan media pembelajaran sehingga membuat mahasiswa sulit mencerna materi belajar khususnya dalam matakuliah Fabrikasi. Tujuan penelitian ini untuk melihat pemanfaatan media video edukasi terhadap hasil belajar untuk matakuliah Fabrikasi Jurusan Teknik Mesin FT UNP. Untuk melihat pemanfaatan media video ini menggunakan teknik penelitian (Research and Development) yang berpatokan kepada model ADDIE. Pelaksanaan penelitian ini dilakukan pada tahun ajaran 2021/2022. Media video pembelajaran ini mencakup beberapa fase yang diarahkan oleh model ADDIE (fase analisis, fase perancangan, fase pengembangan, fase implementasi dan fase evaluasi). Data pada penelitian ini di analisis menggunakan analisis deskriptif kuantitatif. Penelitian ini menghasilkan produk media video yang bisa digunakan untuk pembelajaran di Jurusan Teknik Mesin FT UNP terhadap Matakuliah Fabrikasi. Berdasarkan penilaian dari ahli materi, dari ahli media dan dari responden dari 20 mahasiswa. Pengujian ahli materi mendapat skor normal 80% (sangat baik), dan ahli media mendapat skor normal 80% (sangat baik), dari responden, 20 mahasiswa mendapat skor normal 89,1% (sangat baik). Dari hasil pengujian yang selesai diadakan bisa di simpulkan bahwa video ini sangat berhasil digunakan ketika proses belajar sebagai media belajar mahasiswa dalam matakuliah fabrikasi.
EFEKTIVITAS PEMBELAJARAN DARING DI MASA PANDEMI COVID-19 TERHADAP MAHASISWA JURUSAN TEKNIK MESIN FT-UNP PADA MATA KULIAH TEKNOLOGI PENGELASAN LOGAM
Authors: Ramadhan Akram , Ambiyar Ambiyar , Sari Delima Yanti , Rahim Bulkia
Published: June 2022

Penelitian ini membahas efektivitas pembelajaran daring di masa pandemi Covid-19 terhadap mahasiswa Jurusan Teknik Mesin FT-UNP pada mata kuliah Teknologi Pengelasan Logam. Penelitian ini bertujuan untuk mengkaji pembelajaran daring di masa pandemi Covid-19 terhadap mahasiswa Jurusan Pendidkan Teknik Mesin FT-UNP pada mata kuliah Teknologi Pengelasan Logam. Penelitian ini merupakan penelitian deskriptif kuantitatif dengan menggunakan metode survei yang dilakukan secara online. Penelitian deskriptif kuantitatif merupakan penelitian yang digunakan untuk mendapatkan nilai variabel mandiri, baik satu variabel atau lebih dengan tidak memperlihatkan perbandingan, atau penghubungan dengan variabel yang lain (Saputro, 2016). Variabel penelitian yang diteliti adalah efektivitas proses pembelajaran daring mahasiswa Pendidikan Teknik Mesin Uneversitas Negeri Padang. Aspek pengukur yang diteliti dalam penelitian ini meliputi aspek perencanaan pembelajaran, kegiatan pembelajaran, strategi pembelajaran, media dan teknologi pembelajaran, layanan bantuan belajar. Sumber data dalam penelitian ini yang penulis kumpulkan dengan memakai angket (Kuesioner). Teknik analisis data yang digunakan adalah analisis deskriptif kuantitatif. Hasil penelitian menunjukan bahwa Efektivitas proses pembelajaran daring mahasiswa Pendidikan Teknik Mesin FT-UNP angkatan 2019 yang memilih mata kuliah Teknologi Pengelasan Logam dapat dikatakan cukup efektif. Cukup efektif dalam aspek perencanaan pembelajaran, kegiatan pembelajaran, media dan teknologi pembelajaran, maupun layanan bantuan belajar, aspek strategi pembelajaran.
PENGARUH NOZZLE TEMPERATURE DAN LAYER HEIGHT HASIL 3D PRINTING TERHADAP UJI BENDING MATERIAI ABS
Authors: Ilham Addha , Arafat Andril , Rifelino Rifelino , Nurdin Hendri
Published: June 2022

Kemajuan teknologi telah mempengaruhi berbagai aspek dalam dunia manufaktur, salah satunya adalah rapid prototyping atau 3D printing. Produk hasil 3D printing tidak hanya dibutuhkan untuk pembuatan prototipe saja bahkan penggunaanya juga untuk produk fungsional. Permasalahan yang sering terjadi dalam parakteknya, akibat dari pengaturan parameter proses nozzle temperature dan layer height yang tidak optimal berdampak pada hasil cetakan 3D printing. Tentunya hal ini menjadi pertimbangan yang besar untuk mengahasilkan produk 3D printing yang berkualitas. Oleh karena itu, penelitian ini bertujuan untuk mencari kombinasi pengaturan parameter proses yang optimal dan informasi mengenai pengaruh parameter proses terhadap respon kekuatan bending material hasil cetakan 3D printing. Jenis penelitian yang digunakan penelitian eksperimen. Spesimen dicetak sebanyak Sembilan spesimen dengan variasi parameter proses pencetakan 3D printing menggunakan material ABS. Dalam penelitian ini dilakukan pengujian Bending terhadap hasil 3D printing dengan metode three point bending. Berdasarkan hasil pengujian bending didapat nilai terendah pada kombinasi parameter nozzle temperature 2220 C dan layer height 0.2 mm dengan nilai flextural strength 52.12 MPa. Sedangkan untuk nilai uji bending tertinggi terdapat pada kombinasi parameter nozzle temperature 2320 C dan layer height 0.1 mm dengan nilai flextural strength 57.78 MPa, k­­ombinasi parameter ini sekaligus menjadi parameter yang direkomendasikan untuk proses pencetakan 3D printing. Berdasarkan hasil penelitian didapatkan hasil bahwa variasi dari parameter proses 3D printing mempengaruhi nilai kuat bending material.
KONTRIBUSI GURU MENINGKATKAN KREATIVITAS SISWA DALAM PROSES PEMBELARAJARAN PADA MATA DIKLATDASAR-DASAR MESIN KELAS X DI SMK PENERBANGAN (SPAN) PADANG
Authors: Pratama Vikri Resvi , Purwantono Purwantono , Indrawan Eko , Rahim Bulkia
Published: June 2022

Kurangnya kontribusi guru dalam peningkatan kreativitas siswa pada proses pembelajaran mata diklat Dasar-dasar Mesin di SMK Penerbangan (SPAN) Padang.Tujuan penelitian ini untuk mendiskripsikan kotribusi guru dalam meningkatkan kreativitas siswa.Kontribusi guru dalam meningkatkan kreativitas siswa dalam proses pembelajaran pada mata diklat Dasar-dasar Mesin kelas X di SMK Penerbangan (SPAN) Padang. Pelaksanaan penelitian ini dilakukan pada tahun ajaran 2021/2022. Data pada penelitian ini dianalisis berdasarkan analisis deskripsi dan analisis statistik deskriptif menggunakan teknik total sampling. Hasil penelitian ini pada proses peningkatan kreativitas kontribusi guru terhadap siswa dalam proses pembelajaran mata diklat Dasar-dasar Mesin dengan frekuensi 18 siswaberada pada kategori sangat baik dengan presentasi 45%, pada kategori baik dengan jumlah siswa 21 orang diperoleh persentasi 52,5% dan pada kategori cukup baik dengan jumlah 1 siswa diperoleh persentasi 2,5%.Untuk penerapan metode kontribusi guru pada mata diklat Dasar-dasar Mesin berada pada kategori sangat baik dengan frekuensi 24 siwa diperoleh persentasi 60 %, sedangkan pada kategori baik dengan frekuensi 13 siswa diperoleh persentase 32,5%  dan kategori cukup baik dengan frekuensi 3 siswa diperoleh persentase 7,5%. Untuk kreativitas siswa pada pembelajaran  mata diklat Dasar-dasar Mesin berada pada kategori sangat baik dengan frekuensi 15 siswa diperoleh persentase 37,5%, sedangkan kategori cukup baik dengan frekuensi 4 siswa diperoleh 10 %. Dari hasil pengujian yang telah dilakukan bisa disimpulkan bahwa kontribusi guru dalam peningkatan kreatifitas siswa dalam proses pembelajaran pada mata diklat dasar-dasar mesin kelas X di SMK Penerbangan (SPAN) Padang berada pada kategori baik.
PENERAPAN SOFTWARE INVENTOR UNTUK MENINGKATKAN HASIL BELAJAR PADA MATA DIKLAT GAMBAR TEKNIK MANUFAKTUR KELAS XI SMK NEGERI 1 BUKITTINGGI
Authors: Andika Yoga , Refdinal Refdinal , Nurdin Hendri , Primawati Primawati
Published: June 2022

Pembelajaran Gambar Teknik Manufaktur sering dilakukan menggunakan cara konvensional sehingga minat siswa dalam belajar tergolong rendah. Penelitian ini bertujuan untuk menambah minat peserta didik dalam pembelajar dengan cara menerapkan software Inventor. Penelitian yang dilaksanakan  menggunakan metode kuantitatif Quasi Experiment design berfugsi untuk melihat hasil dari belajar peserta didik melalui pre-test maupun post-test kelas experiment dan juga kelas control. Penelitian ini dilaksanakan pada SMK Negeri 1 Bukittinggi menggunakan metode Sampling Porpuse pada kelas XI jurusan Teknik Mesin. Pengujian pada uji hipotesis ini adalah uji Independent Sampel T-test diperoleh nilai sig (2 tailed) pada kelas experiment dan  kelas control sebesar 0,000, yaitu ≤ 0,05. Kemudian diperoleh nilai dari thitung 6,894. Sedangkan taraf signifikan ttabel 0,05 dengan df sebanyak 60 diperoleh 2,65748. Dapat disimpulkan bahwa thitung > ttabel (6,894 > 2,65748). Pengujian dari nilai N-Gain yang diperoleh dari penerapan software Inventor sebesar 0,453 atau 45,3% yang berarti penerapan dari software Inventor efektif jika diterapkan karena nilai yang diperoleh dari rata-rata standard N-Gain yaitu 0,453 ≥ 0,30. Hasil analisis dari uji t dan uji nilai N-Gain,maka  diperoleh bahwa terdapat kenaikan signifikan  pada  hasil belajar peserta didik menggunakan software Inventor  dibandingkan dengan media konvensional. Hasil dari analisis tersebut menunjukkan bahwa penerapan dari software Inventor efektif digunakan sebagai media dalam pembelajaran Gambar Teknik Manufaktur.
Unconventional interventions on redeveloping unused urban landscapes based on social interactions
Authors: Prochnow Simone Back , Čibik Miroslav
Published: June 2022

In urban landscape, we are increasingly encountering the phenomenon of forgotten places, open areas without function, which were created by sanitation of unpromising objects or influence of various other external factors. We mostly talk about so-called mid-blocks and inner pavilion places which are open free spaces between two elements of a building, or empty areas between two or more separate objects without mutual connection. Thus, undeveloped places in the already standing continuous development which are intended to be reconstructed. This would be the most suitable solution from the point of view of a certain urban concept of the city because the original development would be supplemented and a meaningful urban structure would be created again. However, over time, it is not always easy and possible to redevelop all these places. In this case, it is necessary to think of a new function that would partially replace the original one. As part of green infrastructure and urban planning, municipalities often integrate various green solutions into these places which encourage their residents and users to spend their free time meaningfully in them. In the long run, these solutions are probably the best possible alternative to the above-mentioned supplementation of urban structures. However, it does not always have to be an expensive and sophisticated design but sometimes only a small short-term intervention based on a deeper developed idea called “bring back function” will suffice. The paper describes unconventional interventions to the places without function and seeks their connection with users in the context of social interaction.
Toxic and allergenic plant species in primary school yards of Zagreb’s Lower Town district
Authors: Kušen Mihael , Stura Lara , Purgar Dubravka Dujmović , Poje Miroslav , Židovec Vesna
Published: June 2022

The green infrastructure of Zagreb’s Lower Town is made up of row-planted trees and green spaces within blocks of buildings. All schools are surrounded by green spaces that have a positive impact on the environment. Although most green spaces contribute to improving the quality of life, they also contain toxic and allergenic species which are potentially hazardous, particularly to children. This paper aims to make an inventory of plant species in the environment of primary schools in Zagreb’s Lower Town district, and to determine the presence of toxic and allergenic species. The field research was conducted from March to the end of May 2021 at 7 primary school locations. 13 either annual or biennial plant families were catalogued. In total, 34 species of herbaceous perennials and geophytes, and 36 species of trees from 17 plant families were listed. A total of 38 species of shrubs and climbers were found. Also, a total of 35 poisonous and 28 allergenic plant taxa are planted in the green spaces surrounding primary schools. The most common poisonous species found are Hedera helix and Taxus baccata, and Ilex aquifolium, a highly poisonous species, was also found. No moderately poisonous species have been found at all. As far as allergenic species are concerned, school environments are dominated by those that produce low and moderate levels of pollen concentration in the air. Species that produce high levels of pollen concentration (e.g., Betula pendula, Robinia pseudoacacia, etc.) are the least represented ones, while species that produce a very high concentration of pollen have not been recorded in any of the localities.
Acoustic telemetry data on lake-migratory brown trout, Salmo trutta lacustris L., behavior in Lake Hańcza, northeastern Poland, within one year of release
Authors: Mierzejewska Katarzyna , Dynowski Piotr , Stańczak Katarzyna , Stabiński Robert , Woźniak Małgorzata , Kozłowski Krzysztof , Lejk Adam M. , Kapusta Andrzej
Published: June 2022

The poor results of lake-migratory brown trout, Salmo trutta lacustris L., restoration in Lake Hańcza Nature Reserve prompted undertaking the current study that sought to verify if hatchery-reared fish age 2+ can survive the critical period of acclimation and remain in the lake. Thirty-one individuals were tagged with coded acoustic transmitters and observed for 317 days. This method helped to analyze: 1) the spatial behavior of tagged fish for one year following their release; 2) the possible differences in the behavior of fish released in various places habitually used for stocking. By the end of study, 6.5–12.9% of the tagged fish remained in the lake. The most interesting phenomenon the data indicated was the trout behavior in late spring and early summer, when the fish moved vigorously along the longitudinal axis of the lake continuously for several weeks. The reasons for the fish movements observed in Lake Hańcza were not clear. For this unique species/population it is important to determine whether such behavior is typical of this fish also in other water bodies and if it is only seen in hatchery-reared fish aged 2+ and 3+.
Teaching Sustainability: A Study of Teachers and Conceptual Tensions
Authors: Holfelder Anne-Katrin
Published: June 2022

Teaching sustainability topics puts teachers in a tense relationship: on one hand, they should convey the importance and urgency of the topic, but at the same time, this should be done in such a way that students can form their own judgements. In addition, teachers may themselves become privately involved and interested in the topic, which requires a professional understanding of their role. This concern was pursued in the present study. Teachers who teach sustainability topics were interviewed in semi-structured interviews. This article presents the results by means of case studies that show three contrasting cases. There are two ways of avoiding the tensions and one that takes the tension as an inherent part of the topic.
Education for Sustainable Development, Curriculum Reform and Implications for Teacher Education in a Small Island Developing State
Authors: Clark Keriffe R.
Published: June 2022

Education for Sustainable Development (ESD) has been identified as a viable means of securing a sustainable present and future. However, the existing body of literature related to Sustainable Development (SD) and ESD varies. Additionally, there is a paucity of studies conducted within the context of the Small Island Developing States (SIDS) such as Jamaica which are unique in their biodiversity, culture, economy and society. As a member state of the United Nations, Jamaica is expected to devise and implement strategies towards SD, guided by the 17 Sustainable Development Goals (SDGs). However, there is a need for these strategies to be contextually appropriate and relevant as efforts are pursued to engage in curriculum reform seeking to improve learnersí knowledge, values, competencies and dispositions towards sustainable lifestyles. Consequently, curriculum reform should be carefully aligned with teacher education and its implementers. With this in mind, this paper seeks to i) contextualise ESD, ii) review salient components of curriculum reforms in Jamaica and iii) proffer implications for teacher education in a small island developing state in light of ESD curriculum reforms.
Influence of Slip Parameter, Viscous Dissipation and Joule Heating Effect on Boundary Layer Flow and Heat Transfer Over a Power-Law Stretching Wedge-Shaped Surface with the Correlation Coefficient and Multiple Regressions
Authors: Ali Mohammad , Alim Md. Abdul
Published: June 2022

The influence of slip parameter, viscous dissipation, and Joule heating parameter on MHD boundary layer nanofluid flow over a permeable wedge-shaped surface was analysed. The PDEs and the associated boundary conditions were transformed to a set of non-similar ODEs and the obtained system of equations was solved numerically with the help of the spectral quasi-linearization method (SQLM) by applying suitable software. This method helps to identify the accuracy and convergence of the present problem. The current numerical results were compared with previously published work and are found to be similar. The fluid velocity, fluid temperature, and nanoparticle concentration within the boundary layer region for various values of the parameters such as the slip effect, magnetic strength, Prandtl number, Lewis number, stretching ratio, viscous dissipation, suction, Brownian motion, Joule heating, heat generation, and thermophoresis are studied. It is observed that the Brownian motion, Joule heating, viscous dissipation, and thermophoresis lead to decreases in the heat and mass transfer rate. The skin friction coefficient enhances with slip, magnetic, permeability, and suction parameters, but reduces with the Brownian motion, wedge angle, and stretching ratio parameters whereas there is no effect of mixed convection, thermophoresis, heat generation parameters, the Prandtl and Eckert number.
Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger
Authors: Rashed Musaab K. , Jehhef Kadhum Audaa , Badawy Faris Ali
Published: June 2022

This paper presents a numerical study of heat transfer through a downstream annulus using water as the working fluid within the laminar flow region. The annulus consisted of an outer twisted square duct and an inner circular pipe. A three-dimensional formulation was used to solve the Navier-Stokes equations numerically for the laminar flow system with a low Reynolds number. Three parameters were used in the numerical simulation: the length of the twisted square (a: 6.6, 8.2 10.2, 12.6 mm) the inner diameter of the inner circular pipe (d: 19, 21, 23 and 25 mm); and the twist angle (θ: 0° (smooth), 45°, 60°, and 90°). Numerical calculations were conducted on sixteen twisted square duct heat exchangers, with water flowing within a Reynolds number range of 220 – 1100. The results were illustrated as a profile of the thermal enhancement factor, the friction factor and the Nusselt number. The results show that the twisted outer duct of the heat exchanger can create a swirl flow along the length of the heat exchanger. It also caused a boundary layer separation-reattachment on the wall of the inner pipe. Moreover, an increase in the twist angle increased the Nusselt number by 20 %, and the friction factor was also increased as the annular gap of the heat exchanger decreased.
Influence of Welding Parameters of Resistance Spot Welding on Joining Aluminum with Copper
Authors: Sar Mohammed Helan , Ridha Munaf Hashim , Husain Imad M. , Barrak Osamah Sabah , Hussein Sabah Khammass
Published: June 2022

The resistance spot welding (RSW) method was used to join aluminum alloy AA 1050 and copper alloy UNS C50100 sheets. Mechanical properties of the joints were examined. The influence of welding process parameters on tensile shear force of the joints was discussed. The design of experiments (DOE) method was used to analyze the influence of welding parameters on the mechanical properties of the joints. Three RSW parameters were used: welding current, squeeze time, and welding time. The results showed that the joint shear stress increased with increasing the welding current until a value of 12000 Amp. Then the shear stress decreased. The tensile shear stress increased with increasing the welding and squeeze time. As a consequence, it can be possible to weld copper with aluminum by RSW.
If They Don’t Understand the Question, They Don’t answer. Language Mismatch in Face-to-Face Interviews
Authors: Jacobsen Jannes
Published: June 2022

The provision of translated field instruments is a crucial aspect to reduce response burden and subsequently increase data quality in surveys with a multi-linguistic target population such as surveys on recent immigrants. Failure to address this can result in a mismatch between the survey language and the respondent’s mother tongue. By using a survey on refugees in Germany, this article explores the correlation of the absence of the respondents’ mother tongue on item nonresponse – a crucial aspect of data quality. Further, this article investigates whether supplementary audio recordings in the same language as the written questions can reduce item nonresponse when the mother tongue is not available. To answer the research questions, all missing answers per individual are counted and analyzed by means of poisson regression analyses. In a second step, the likelihood of item-nonresponse for single items is estimated as well. Results show that a language mismatch as well as the usage of audio recordings increase item nonresponse.
Improving the Output Quality of Official Statistics Based on Machine Learning Algorithms
Authors: Meertens Q.A. , Diks C.G.H. , van den Herik H.J. , Takes F.W.
Published: June 2022

National statistical institutes currently investigate how to improve the output quality of official statistics based on machine learning algorithms. A key issue is concept drift, that is, when the joint distribution of independent variables and a dependent (categorical) variable changes over time. Under concept drift, a statistical model requires regular updating to prevent it from becoming biased. However, updating a model asks for additional data, which are not always available. An alternative is to reduce the bias by means of bias correction methods. In the article, we focus on estimating the proportion (base rate) of a category of interest and we compare two popular bias correction methods: the misclassification estimator and the calibration estimator. For prior probability shift (a specific type of concept drift), we investigate the two methods analytically as well as numerically. Our analytical results are expressions for the bias and variance of both methods. As numerical result, we present a decision boundary for the relative performance of the two methods. Our results provide a better understanding of the effect of prior probability shift on output quality. Consequently, we may recommend a novel approach on how to use machine learning algorithms in the context of official statistics.
Data Fusion for Joining Income and Consumtion Information using Different Donor-Recipient Distance Metrics
Authors: Meinfelder Florian , Schaller Jannik
Published: June 2022

Data fusion describes the method of combining data from (at least) two initially independent data sources to allow for joint analysis of variables which are not jointly observed. The fundamental idea is to base inference on identifying assumptions, and on common variables which provide information that is jointly observed in all the data sources. A popular class of methods dealing with this particular missing-data problem in practice is based on covariate-based nearest neighbour matching, whereas more flexible semi- or even fully parametric approaches seem underrepresented in applied data fusion. In this article we compare two different approaches of nearest neighbour hot deck matching: One, Random Hot Deck, is a variant of the covariate-based matching methods which was proposed by Eurostat, and can be considered as a ’classical’ statistical matching method, whereas the alternative approach is based on Predictive Mean Matching. We discuss results from a simulation study where we deviate from previous analyses of marginal distributions and consider joint distributions of fusion variables instead, and our findings suggest that Predictive Mean Matching tends to outperform Random Hot Deck.
Some Thoughts on Official Statistics and its Future (with discussion)
Authors: Tillé Yves , Debusschere Marc , Luomaranta Henri , Axelson Martin , Elvers Eva , Holmberg Anders , Valliant Richard
Published: June 2022

In this article, we share some reflections on the state of statistical science and its evolution in the production systems of official statistics. We first try to make a synthesis of the evolution of statistical thinking. We then examine the evolution of practices in official statistics, which had to face very early on a diversification of sou rces: first with the use of censuses, then sample surveys and finally administrative files. At each stage, a profound revision of methods was necessary. We show that since the middle of the 20th century, one of the major challenges of statistics has been to produce estimates from a variety of sources. To do this, a large number of methods have been proposed which are based on very different f oundations. The term “big data” encompasses a set of sources and new statistical methods. We first examine the potential of valorization of big data in official statistics. Some applications such as image analysis for agricultural prediction are very old and will be further developed. However, we report our skepticism towards web-scrapping methods. Then we examine the use of new deep learning methods. With access to more and more sources, the great challenge will remain the valorization and harmonization of these sources.
The Impact of Trust in Government – Young Voters’ Behavioral Intention to Use I-voting in Slovenia
Authors: Kozel Edvard , Dečman Mitja
Published: June 2022

In order to create public value and meet the demands of the modern information society, governments and public administrations strongly rely on information technology and e-government, but its acceptance is significantly influenced by the level of citizens’ trust in government. This study explores the issue of citizens’ trust in government in relation to i-voting in Slovenia, a country with existing interest in i-voting but a low level of trust in government, especially among the young population. The authors analyze how such distrust impacts behavior intention towards i-voting, decomposing trust into a political component and an administrative component, and into local and state levels. Based on a modified version of the Unified Theory of Acceptance and Use of Technology, the results of 194 respondents show that young student voters’ trust in politicians and electoral committees does not affect their intention to use i-voting. However, they trust the local level of government more than the state level, and electoral committees more than politicians.
Electricity Access in non-OECD Countries: Do Household Size and Composition Matter?
Authors: Strmota Marin , Ivanda Krešimir
Published: June 2022

Despite considerable improvements in electricity coverage, millions of people are still lacking the access to electricity. Residential electricity access is a prerequisite for numerous aspects of increased well-being and quality of life. The aim of this paper is to identify key household characteristics that are linked to the energy poverty measured as access to electricity. Literature on financial and general poverty showed mixed results on household size and characteristics as a driver of poverty. We argue that household size and proportion of children in households are key variables associated with energy poverty in developing countries with lowest levels of electricity coverage. Our research approach treats electricity access as economic good and focuses on demand side – households. By utilizing census microdata across 69 non-OECD countries, our research provides large-scale analysis on household size and characteristics as a driver of energy poverty. We found that, in majority of low-income countries, same principles for general or financial poverty apply to energy poverty which is represented by negative effect of household size and proportion of children on energy poverty.
Development of critical thinking and language proficiency among undergraduate Swedish online EFL students
Authors: Johansson Evelina
Published: June 2022

Critical thinking (CT) is considered important in second language (L2) learning. Previous studies have investigated and confirmed a correlation between critical thinking and L2 learning in face-to-face (f2f) learning. The present study aimed to investigate the correlation between CT and L2 proficiency in an online learning environment. The participants in this study were undergraduate Swedish students taking part in an online EFL course at a Swedish university. Students’ CT skills were measured by the California Critical Thinking Skills Test (CCTST). As previous studies confirm that vocabulary size correlates with general language proficiency, it was seen as a suitable measure of students’ L2 proficiency. Hence, the Vocabulary Size Test (VST) was used to measure students’ vocabulary size. The present study was designed as a pre-test post-test study aiming to investigate the correlation between the processes of CT development and L2 learning during one semester of four months. Contrary to previous studies, no correlation between CT and L2 proficiency could be detected. Moreover, students in this study made no statistically significant improvement of CT and L2 proficiency. The results must be interpreted in light of students’ already high levels of CT and L2 proficiency and the relatively short testing period.
Philosophy of Posthuman Art
Authors: Sorgner Stefan Lorenz
Published: June 2022

Aesthetic reflections by various members of the Frankfurt school have dominated the art world for many decades. Sorgner shows that they introduced a paternalistic logic in the field of aesthetics while attempting to overcome paternalism. His art philosophical alternative reveals the option of creating non-totalitarian total works of art. The wide spectrum of posthuman artworks reveals the immense diversity of nontotalitarian total works of art.
 
 “A deeply considered survey of the posthuman future of art. Sorgner’s philosophy of posthumanism provides a path away from the dominant 20th-century aesthetics that still inform our conception of art today. Through the innovative concept of the ‘twist,’ Sorgner’s encyclopedic text frames posthumanism as the foundation of an anti-totalitarian future of art.” Eduardo Kac
“Philosophy of Posthuman Art impressively examines the aesthetics of the monstrous, of hybridity, of smoothness and of the amorphous, to name a few. It is an articulate and informed analysis not only of particular artworks but also their philosophical underpinnings of Critical Posthumanism, Transhumanism and Metahumanism. It not only includes examples of bioart, body art, performance art and cryptoart, but also techno, digital and cyborg music. It is a time when we transition from the ontology of Being to the ontology of Becoming. We are now in a liminal age of the hybrid and the chimera. And as Stefan Lorenz Sorgner reminds us, with a twist, we have always been cyborgs.” Stelarc
Stigma and attitudes toward mental illness among medical students: a cross-sectional study
Authors: Alhuda Rayed , Al-Thaqafi Hatem , Altowairqi Khalid , Alfahmi Thamer , Alharbi Malik , Mufti Rana
Published: June 2022

Background: Mental disorders are a significant burden worldwide. Medical students as future physicians need to have appropriate knowledge and positive attitudes toward mentally ill patients. The objectives of the current study are to determine knowledge and attitude toward mental illness in medical students and compare the knowledge and attitude between medical students who completed a psychiatry course and those who did not.
Methods: A cross-sectional study was conducted among medical students at Umm Al-Qura University in Makkah, Saudi Arabia. The study sample was divided into two groups: The first group included medical students who did not complete the psychiatry course. The second group included medical students who completed the psychiatry course. The data were collected using a previously well-structured online questionnaire distributed to the students.
Results: The study included 367 medical students (66.8% males). The mean age was 21.94. Participants were mainly from the third and fifth years of medical school (32.2%, 21.8%). Out of all participants, (63.5%) did not complete the psychiatry course. The majority did not take their psychiatry hospital placement (85.6%). Most participants had good knowledge (63.2%) and positive perception and attitudes (61.9%, 76.3%). Academic year difference positively affected knowledge about mental illness causes (p = 0.022) and attitudes (p = 0.010). Psychiatry hospital placement positively affected the perception of mental illness (p = 0.020).
Conclusion: Overall, the students appeared to have good knowledge, positive attitudes, and a positive perception of mental illnesses. In addition, the percentage of stigmatizing thoughts was minimal.
The structure of the life world of a modern person: traditional views and an alternative view
Authors: Popkova Natalya Alexandrovna
Published: June 2022

The purpose of the study is to substantiate and develop the author's model of the structure of the life world of a modern person based on the analysis of fundamental sociophilosophical ideas about the structuring of the human life world. The scientific novelty consists in generalizing the views of various representatives of the phenomenological direction on the human life world and structuring the life world of a modern person, taking into account such factors as the socio-biological nature of a person, the multidimensional nature of the human psyche and the peculiarities of the space of everyday life of a modern person. As a result, it is proved that the structure of the life world of a modern person is nothing more than a three-component system formed by the "objective world", reflecting the biological essence of a person and the experience of scientific research accumulated by mankind, the "social world", reflecting the social essence of a person and the moral and ethical norms developed by mankind, the" inner world", reflecting the peculiarities of the functioning of the human psyche in cognitive, emotional, evaluative and behavioral aspects.
Experimental Study on Natural Convection Heat Transfer from Two Parallel Horizontal Cylinders in Horizontal Cylindrical Enclosure
Authors: Ahmad Ahmad T.
Published: June 2022

An experimental study on natural convection heat transfer from two parallel horizontal cylinders in horizontal cylindrical enclosure was carried out under condition of constant surfaces temperature for two cylinders and cylindrical enclosure. The study included the effect of Rayleigh number, rotation angle that represent the confined angle between the passing horizontal plane in cylindrical enclosure center and passing line in two cylinders centers, and the spaces between two cylinders on their heat loss ability. An experimental set-up was used for this purpose which consist water container, test section which is formed of plastic cylinder that represent the cylindrical enclosure, and two heating elements which are formed of two copper cylinders with (19 mm) in diameters heated internally by electrical sources that represents transfer and heat loss elements through this set-up. The experiments were done at the range of Rayleigh number between (), cylinders rotation angle at (), and spacing ratio at (). The study showed that the ability of heat loss from two cylinders is a function of Rayleigh number, cylinders rotation angle, and the spaces between them. This ability is increased by increasing of Rayleigh number and it was showed that this ability reaches maximum value at the first cylinder () and minimum value at the second cylinder () at spacing ratio (S/D=3) and rotation angle () for the first and () for the second cylinder respectively. The effective variables on natural convection heat transfer from the above two cylinders are related by two correlating equations, each one explains dimensionless relation of heat transfer from each cylinder that represented by Nusselt number against Rayleigh number, rotation angle, and the spacing ratio between two cylinders.
Case Study of Baji Gas Station unit one and Three for Performance Determination
Authors: Ahmad Ahmad H.
Published: June 2022

Baiji thermal station supplied by heavy fuel HFO from Baiji refinery, while the gas station is operated by heavy fuel HFO and light fuel LFO, the first unit operates using LFO, the third unit operates using HFO. The results showed that the specific fuel consumption is reduced by rising the load, when the load is reduced to 20Mw s.f.c almost 0.765m3/Mw.hr this rate start to fall to become 0.35m3/Mw.hr when the unit operate near its maximum capacity for LFO, while the heavy fuel increases by 15% for the same number above. It’s correct that LFO is good but it is expensive which costs 1000$ per imported ton , in order to cover the load of 8000Mw for one year itcosts 1.92E+10$ for imported LFO ,9.6E+10$ for the local LFO, and 2.8E+9$ for HFO, the difference is obvious which is ten times the total cost. Also the studied performance of the gas units showed that the net is experience from a  downturn of frequency along 24hr except in the let hours at night, while the allowed frequency is 50HZ±1.5, and the true efficiency of the units is a function of the load which stabilized at 29%±0.2 for the first unit and 25% for the third unit, while the thermal efficiency is stabilized at48% for the first unit and 51% for the third, therefore the unit efficiency is improved by 4% when we use LFO. When in take in to account the pollution, the heavy fuel HFO contains 4.5% sulpher which releases sulpheric acid and 1% vanadium treated by adding inhibitor about 1.5L/Mw.hr, these ratio are not considered for LFO with respect to HFO.
Künstliche Intelligenz und Gesundheit. Ethische, philosophische und sozialwissenschaftliche Explorationen
Authors: Sonar Arne , Weber Karsten
Published: June 2022

Der Einsatz von künstlicher Intelligenz im Gesundheitsbereich verspricht besonders großen Nutzen durch eine bessere Versorgung sowie effizientere Abläufe und bietet damit letztlich auch ökonomische Vorteile. Dem stehen unter anderem Befürchtungen entgegen, dass sich durch den Einsatz von künstlicher Intelligenz das Arzt-Patienten-Verhältnis verändern könnte, Arbeitsplätze gefährdet seien oder die Ökonomisierung des Gesundheitswesens einen weiteren Schub erfahren könnte. Zuweilen wird die Debatte um diese Technologie, zumal in der Öffentlichkeit, emotional und fern sachlicher Argumente geführt. Die Autorinnen und Autoren untersuchen die Geschichte des KI-Einsatzes in der Medizin, deren öffentliche Wahrnehmung, Governance der KI, die Möglichkeiten und Grenzen der Technik sowie Einsatzgebiete, die bisher noch nicht oder nur wenig im Fokus der Aufmerksamkeit waren. Dabei erweist sich die KI als leistungsfähiges Werkzeug, das zahlreiche ethische und soziale Fragen aufwirft, die bei der Einführung anderer Technologien bereits gestellt wurden; allerdings gibt es auch neue Herausforderungen, denen sich Professionen, Politik und Gesellschaft stellen müssen.