bluuebunny/crossref_metadata_2025 huggingface dataset:
When are Social Network Sites Connections with Coworkers Beneficial? The Roles of Age Difference and Preferences for Segmentation between Work and Life
Authors: Ollier-Malaterre Ariane ,   Corresponding author, Université du Québec A Montréal, Canada, Foucreault Annie ,   Université du Québec A Montréal, Canada
Published: March 2022

Individuals are increasingly connected with their coworkers on personal and professional social network sites (SNS) (e.g., Facebook), with consequences for workplace relationships. Drawing on SNS research and on social identity and boundary management theory, we surveyed 202 employees and found that coworkers’ friendship acts (e.g., liking, commenting) were positively associated with closeness to coworkers when coworkers were similar in age to or older than the respondent and were positively associated with organizational citizenship behaviors towards coworkers (OCBI) when coworkers were similar in age. Conversely, harmful behaviors from coworkers (e.g., disparaging comments) were negatively associated with closeness when coworkers were older than the respondent, and with OCBI when coworkers were older than the respondent and coworkers’ friendship acts were high. Preferences for work-life segmentation moderated the relationship between coworkers’ friendship acts and OCBI (but not closeness) such that the positive relationship was stronger when the respondent had low (vs. high) preferences for segmentation. We discuss the theoretical and practical implications of this study and propose an agenda for future research.
The Building Blocks of Software Platforms: Understanding the Past to Forge the Future
Authors: Li He ,   Clemson University, USA, Kettinger William J. ,   Clemson University, USA
Published: March 2022

This study takes a review and theory development (RTD) approach to synthesizing the software platform literature, offering theoretical perspective and research guidance. In doing so, we conceptualize platform and complementary capabilities for software platform owners and complementors. The review indicates that three dimensions reflect platform capabilities: intermediarity, generativity, and ambidexterity, while complementary capabilities include creativity, interconnectivity, and appropriability dimensions. We derive an integrative framework of software platforms, which explains (1) how software platform owners and complementors improve performance by enhancing their capabilities, and (2) how software platform owners, complementors, and the ecosystem environment coevolve. We then discuss how future research can build on and enrich the research framework
A Motivation-Hygiene Model of Open Source Software Code Contribution and Growth
Authors: Sharma Pratyush Nidhi ,   The University of Alabama, USA, Daniel Sherae L. ,   University of Cincinnati, USA, Chung Tingting (Rachel) ,   College of William & Mary, USA, Grover Varun ,   University of Arkansas, USA
Published: March 2022

The success of open source software (OSS) projects depends on sustained contributions by developers who often display a wide variety of contribution patterns. Project leaders and stakeholders would strongly prefer that developers not only maintain but preferably increase their contributions over time as they gain experience. Corporations increasingly complement OSS developer motivations (such as fit in terms of shared values with the project community) by paying them to sustain contributions. However, practitioners argue whether payment helps or hurts projects because monetary compensation may dampen developer motivation in the long run, making it difficult for project leaders to understand what to expect from developers over time. Using Herzberg motivation-hygiene framework, we explore how developer perceptions of value fit with the project and being paid interact to determine the level of code contribution and its rate of change over time (i.e., growth). Using a survey of 564 developers across 431 projects on GitHub, we build a three-level growth model explaining the code contribution and its growth over a six-month period. We find that value fit with the project positively influences both the level and growth of code contribution. However, there are notable differences among paid and unpaid developers in the impact of value fit on their level and growth in code contributions over time. The implications of our work will be of interest to researchers, practitioners, and organizations investing in open source projects.
How Big Data Analytics Affects Supply Chain
Decision-Making: An Empirical Analysis
Authors: Chen Daniel Q. ,   M. J. Neeley School of Business, Texas Christian University, USA, Preston David S. ,   M. J. Neeley School of Business, Texas Christian University, USA, Swink Morgan ,   M. J. Neeley School of Business, Texas Christian University, USA
Published: March 2022

This study investigates how different types of “big data analytics” (BDA) usage influence organizational decision-making in the area of supply chain management (SCM). Drawing on decision-making theory and organizational information processing theory, we conceptualize two patterns of BDA usage for supply chain (SC) activities (BDA use for SC optimization and BDA use for SC learning) and report two complementary channels via which the two BDA usage patterns impact a supply chain organization’s BDA-enabled decision-making capability. An analysis of questionnaire data from supply chain managers representing 157 companies based in North American suggests that BDA use for SC optimization is directly associated with better decision-making capability. In contrast, the influence of BDA use for SC learning does not impact decision-making directly but indirectly, as its effect is fully mediated by organizational integration. We discuss the implications of these findings for future academic research and for managers in practice who seek to maximize business values from BDA implementations.
In the Backrooms of Data Science
Authors: Parmiggiani Elena ,   Department of Computer Science, Norwegian University of Science and Technology, Norway, Østerlie Thomas ,   Department of Computer Science, Norwegian University of Science and Technology, Norway, Almklov Petter Grytten ,   Department of Sociology and Political Science, Norwegian University of Science and Technology, Norway
Published: March 2022

Much information systems research on data science treats data as preexisting objects and focuses on how these objects are analyzed. Such a view, however, overlooks the work involved in finding and preparing the data in the first place, such that they are available to be analyzed. In this paper, we draw on a longitudinal study of data management in the oil and gas industry to shed light on this backroom data work. We find that this type of work is qualitatively different from the front-stage data analytics in the realm of data science but is also deeply interwoven with it. We show that this work is unstable and bidirectional. That is, the work practices are constantly changing and must simultaneously take into account what data might be possible to access as well as the potential future uses of the data. It is also a collaborative endeavor involving cross-disciplinary expertise that seeks to establish control over data and is shaped by the epistemological orientation of the oil and gas domain.
Examining the Impacts of Airbnb Review Policy Change on Listing Reviews From Other Worlds: Speculative Engagement Through Digital Geographies
Authors: Mousavi Reza ,   Mclntire School of Commerce, University of Virginia, USA, Zhao Kexin ,   Belk College of Business, University of North Carolina at Charlotte, USA
Published: March 2022

In July 2014, Airbnb, one of the biggest firms in the sharing economy, decided to change the way that guests and hosts reviewed each other on the platform. Prior to this change, guests/hosts could post reviews about their experiences asynchronously, the guest/host would be able to see the other partys review whenever it was posted. In contrast, the new review policy rolled out a simultaneous review system, making reviews viewable only after both the guest/host post their own reviews. This study empirically evaluates the impacts of this new review policy on the informativeness of guest reviews, measured by both informational content (semantic diversity and objectivity) and personal opinions (sentiment and sentiment heterogeneity). Using regression discontinuity design and a variety of techniques in the text analytics domain including a novel adaptation of BERT, we demonstrate that Airbnb review policy change enhanced the informational content of guest reviews in terms of semantic diversity and objectivity. We also show that review sentiment was reduced but became more diverse. Subgroup analysis revealed that low-quality listings were subject to more changes than high-quality listings. We further explore the short-term and long-term effects of the review policy change and demonstrate that the simultaneous review system has had a long-lasting impact on the informativeness of guest reviews.
Acting with Inherently Uncertain Data: Practices of Data-Centric Knowing
Authors: Mikalsen Marius ,   Norwegian University of Science and Technology / SINTEF, Norway, Monteiro Eric ,   Norwegian University of Science and Technology, Norway
Published: March 2022

Data-driven data science challenges our conceptualization of “data.” Significantly beyond capturing a given phenomenon, data, increasingly, are the phenomenon. Data may be iteratively manipulated algorithmically, undermining the “faithfulness” of data to any originating phenomenon. Crucially, data that are not “faithful” are inherently uncertain, as data risk becoming meaningless symbols. We empirically study how a community of commercially based geoscientists grapples with the phenomenon of offshore oil and gas reservoirs located kilometers below the seabed. The data available about these reservoirs are algorithmically manipulated sensor-based Internet of Things data. Our main contribution is the articulation of three patterns of work practices detailing how inherently uncertain data are woven into consequential work practices: (1) Accumulating is the cumulative process of supporting and triangulating one set of data with supplementary data sets; accumulating captures the conservative approach of backing up existing interpretations of the data. (2) Reframing describes the process where existing interpretations are contested by new data or models; reframing captures that there are limits to how far data can be manipulated. (3) Prospecting, or the cultivation of competing, incompatible data interpretations; while the former two patterns essentially attempt to regulate uncertainty, prospecting is about embracing it. Our concept of data-centric knowing is constituted by these three interwoven, ongoing practices.
On the Design of and Interaction with Conversational Agents: An Organizing and Assessing Review of Human-Computer Interaction Research
Authors: Diederich Stephan ,   University of Göttingen, Germany, Brendel Alfred Benedikt ,   TU Dresden, Germany, Morana Stefan ,   Saarland University, Germany, Kolbe Lutz ,   University of Göttingen, Germany
Published: March 2022

Conversational agents (CAs), described as software with which humans interact through natural language, have increasingly attracted interest in both academia and practice because of improved capabilities driven by advances in artificial intelligence and, specifically, natural language processing. CAs are used in contexts such as peoples private lives, education, and healthcare, as well as in organizations to innovate or automate tasks for example, in marketing, sales, or customer service. In addition to these application contexts, CAs take on different forms in terms of their embodiment, the communication mode, and their (often human-like) design. Despite their popularity, many CAs are unable to fulfill expectations, and fostering a positive user experience is challenging. To better understand how CAs can be designed to fulfill their intended purpose and how humans interact with them, a number of studies focusing on human-computer interaction have been carried out in recent years, which have contributed to our understanding of this technology. However, currently, a structured overview of this research is lacking, thus impeding the systematic identification of research gaps and knowledge on which future studies can build. To address this issue, we conducted an organizing and assessing review of 262 studies, applying a sociotechnical lens to analyze CA research regarding user interaction, context, agent design, as well as CA perceptions and outcomes. This study contributes an overview of the status quo of CA research, identifies four research streams through cluster analysis, and proposes a research agenda comprising six avenues and sixteen directions to move the field forward
A Design Theory for Energy and Carbon Management Systems in the Supply Chain The Quest for Innovation in Information Systems Research: Recognizing, Stimulating, and Promoting Novel and Useful Knowledge
Authors: Zampou Eleni ,   ELTRUN Research Center, Athens University of Economics and Business, Greece, Mourtos Ioannis ,   ELTRUN Research Center, Athens University of Economics and Business, Greece, Pramatari Katerina ,   ELTRUN Research Center, Athens University of Economics and Business, Greece, Seidel Stefan ,   University of Liechtenstein, Liechtenstein
Published: March 2022

Energy and carbon management systems (ECMS) are a class of green information systems that has the potential to increase environmental sustainability in organizations and across supply chains. Employing a design science research approach, we define the scope of ECMS in the supply chain context, identify requirements, design an expository instantiation, and develop an information systems design theory, including key constructs and design principles. We instantiate this theory in four supply chain contexts to validate and revise the proposed design in two rounds. We identify six system components data collection, energy monitoring, supply chain coordination, ECMS workflow engine, reporting, and carbon footprint estimator that integrate and coordinate four types of information flows (transactional, contextual, energy, and product environmental), and formulate design principles. Our evaluation indicates that the ECMS design theory, if instantiated, supports energy and carbon measurement and environmentally aware decision-making and practice in supply chains. We also highlight how considering energy information flows in combination with material features that afford environmentally aware decision-making and practice are key to qualifying information systems as green.
Explaining Persistent Ineffectiveness in Professional Online Communities: Multilevel Tensions and Misguided Coping Strategies
Authors: Stein Mari-Klara ,   Copenhagen Business School, Denmark, Lim Eric T. ,   UNSW Sydney, Australia, Tan Chee-Wee ,   Copenhagen Business School, Denmark
Published: March 2022

Online communities (OCs) have become an increasingly prevalent way for organizations to bring people together to collaborate and create value. However, despite the abundance of extant literature, many studies still point to the lack of long-term sustainability of OCs. We contend that communities become dormant or obsolete over time because of manifestations of ineffectiveness a state of the community that hinders the attainment of individual and collective desired outcomes. While ineffectiveness in OCs is common, it is less apparent why such ineffectiveness persists. Two knowledge gaps are particularly significant here. First, while the multilevel nature of OCs is acknowledged, corresponding difficulties in aligning individual and collective interests and behaviors have often been neglected in past studies. Second, rare longitudinal studies have revealed that community members respond to ineffectiveness with various coping behaviors. However, the impact of these coping behaviors may not turn out as desired. Consequently, we investigate the persistence of ineffectiveness from the perspective of multilevel and coping effects, addressing the following research question: How and why does ineffectiveness persist in online communities? Our critical realist case study offers a three-step explanatory framework: (1) underlying multilevel tensions in the community contribute to usage ineffectiveness (i.e., members are unable to use the OC effectively); (2) misguided coping behaviors contribute to ineffective adaptation (i.e., members are unable to cope with not being able to use the OC effectively); and (3) ineffectiveness persists due to the interaction between usage and adaptation ineffectiveness.
“Doctor as a drug” in a stroke follow-up
Authors: Aleshchenko E. A. , Kashtalap V. V.
Published: March 2022

Each year about 400 000 people in Russia get strokes. Whereas an acute treatment takes place in specialized intensive care units in hospitals, follow-up is handed over to general (rarely – private) practitioner. The majority of stroke survivors show low adherence to follow-up resulting in repeated hospitalizations and growth of multi-morbidity burden. With COVID-19 pandemic negatively affecting availability of medical services and increasing health risks for stroke survivors, a physician-patient relation becomes the means of persuading patients to healthpromoting behaviour.
Tobacco smoking and cognitive functionioning in adolescents: a population study
Authors: Sukhanov A. V. , Denisova D. V. , Pylypenko P. I. , Gafarov V. V.
Published: March 2022

Highlights. A population-based study of a representative sample of Siberian adolescents revealed for the first time quantitative changes in memory and attention patterns associated with smoking, depending on gender. At the time of the survey of adolescents, the average number of mistakes made in the test with memorization of 10 words was higher in comparison with non-smokers.

Background. The literature data on the association of cognitive impairment with smoking status, which is a conventional risk factor for cardiovascular diseases, in adolescence in an open population remains controversial.

Aim. To examine the effect of smoking on certain cognitive functions indicators in adolescents in the open population of the Novosibirsk region.

Methods. Cognitive functions were studied in 549 adolescents (231 boys (42.1%) and 318 girls (57.9%), mean age - 15.66±0.9 years). The smoking questionnaire in this group was completed by 332 participants. Cognitive functions were assessed using a proofreading test, a Luria test with memorization of 10 words, and a concept exclusion test. Smoking was assessed based on a questionnaire survey. An adolescent, who smoked at least 1 cigarette per week was considered a regular smoker. Descriptive statistics methods and analysis of contingency tables were performed in the statistical package “R” for Windows.

Results. Among adolescents who smoked at the time of the examination (n = 67), the average number of mistakes in the test with memorization of 10 words was higher (2.21±1.04 words), compared with 1.88±1.05 words in the non-smoking group (n = 265). At the same time, there were no statistically significant differences in this cognitive indicator between male smokers and nonsmokers, while differences between female smokers and nonsmokers remained.

Conclusion. In adolescents who smoke, direct memorization of the presented stimulus material is predominantly affected. This is due to the worst assimilation of educational materials by adolescent smokers.
PENGARUH PANJANG KAMPAS KOPLING TERHADAP AKSELERASI DAN TOP SPEED SEPEDA MOTOR MATIC
Authors: Almahbubi Abdan Syakuro , Paryono Paryono , Kusuma Fuad Indra
Published: March 2022

Penelitian ini bertujuan mengetahui perbedaan akselerasi & top speed sepeda motor matic Honda BEAT PGM-FI 110 cc melalui variasi panjang kampas kopling. Metode penelitian yang digunakan adalah Eksperimen Semu dengan model disain Randomized control-grup only design. Berdasarkan hasil analisis data akselerasi dihasilkan nilai signifikansi data akselerasi 0-60 Km/h sebesar 0,001, data akselerasi 0-80 Km/h sebesar 0,002, data akselerasi 0-100 Km/h sebesar 0,000. Pada pengujian top speed didapatkan nilai signifikansi sebesar 0,024. Dengan demikian hasil analisis data melihatkan bahwasanya nilai signifikansi <0,05, maka ditarik kesimpulan ada perbedaan yang signifikan variasi panjang kampas kopling terhadap akselerasi dan top speed. Hasil pengujian menunjukkan panjang kampas kopling 7 cm memiliki akselerasi tertinggi dan top speed puncak tertinggi.
PENGARUH PENAMBAHAN POWER JET DENGAN VARIASI UKURAN PADA MEKANISME KARBURATOR TERHADAP AKSELERASI DAN KONSUMSI BAHAN BAKAR PADA SEPEDA MOTOR 110 CC
Authors: Widiyanto Bayu Ari , Nauri Imam Muda , Mindarta Erwin Komara
Published: March 2022

Penelitian ini bertujuan untuk mengetahui pengaruh penambahan power jet dengan variasi ukuran pada mekanisme karburator terhadap akselerasi dan konsumsi bahan bakar pada sepeda motor 110 cc. Rancangan penelitian yang digunakan dalam penelitian ini  adalah eksperimen dengan desain penelitian Posttes-Only Control Design. Dari hasil analisis data menunjukan nilai signifikansi dari uji hipotesis sebesar 0,000 dari kedua data tersebut. Dengan demikian hasil analisis data dari keduanya menunjukan bahwa nilai signifikansinya < 0,05. Sehingga dapat disimpulakan bahwa terdapat pengaruh yang signifikan penambahan power jet dengan variasi ukuran terhadap akselerasi dan konsumsi bahan bakar.
PENGARUH PENGGUNAAN MEDIA PEMBELAJARAN E-LEARNING BERBASIS EDMODO PADA MATA PELAJARAN TEKNIK DASAR OTOMOTIF UNTUK MENINGKATKAN HASIL BELAJAR PESERTA DIDIK KELAS X TEKNIK KENDARAAN RINGAN OTOMOTIF DI SMK NEGERI 6 MALANG
Authors: Antikasari Avista Novi , Partono Partono , Putra Andika Bagus Nur Rahma
Published: March 2022

Penelitian ini bertujuan untuk meningkatkan hasil belajar siswa dengan menggunakan media Edmodo berbasis e-learning. Jenis penelitian merupakan penelitian kuantitatif jenis eksperimental semu dengan  Randomized Posttest Only Control Design. penelitian dilakukan di SMK Negeri 6 Malang. Analisis data dengan uji Independent Sample T Test. Hasil penelitian menunjukkan bahwa  terdapat perbedaan hasil belajar antara pembelajaran dengan menggunakan media pembelajaran e-learning berbasis Edmodo dengan pembelajaran yang tidak menggunakan media pembelajaran e-learning berbasis Edmodo pada peserta didik kelas X TKRO di SMK Negeri 6 Malang.
PENGARUH KENDALI ECU EFI SAAT PENGAPIAN PADA BERBAGAI OKTAN NUMBER TERHADAP EMISI GAS BUANG SEPEDA MOTOR 125cc
Authors: Muhith Abdul , Harly Muchammad , Sumarli Sumarli
Published: March 2022

Kualitas bahan bakar sangat mempengaruhi emisi gas buang sepeda motor. Emisi seperti karbonmonoksida & hidrokarbon dapat menyebabkan polusi lingkungan. Salah satu cara untuk mengatasi masalah ini dengan mengoptimalkan cara kerja mesin, berupa pengaturan timing awal pengapian. Dengan pengaturan timing awal pengapian dan pemilihan bahan bakar yang tepat bisa meminimalisir emisi gas buang. Tujuan dari penelitan ini untuk mengetahui pengaruh kendali ecu efi saat pengapain pada berbagai oktan number terhadap emisi karbonmonoksida dan emisi hidrokarbon. Penelitian ini dilakukan dengan menggunakan skema dari setiap variasi timing awal pengapian (7 BTDC, 10 BTDC, 13 BTDC) dan oktan number (RON 90, RON 92). Alat yang digunakan untuk pengetesan yaitu Engine Gas Analyzer. Dari penelitian ini didapatkan hasil emisi karbonmonoksida terendah saat menggunakan timing awal pengapian 10 BTDC pada 5000rpm sebesar 0,19% dan oktan number 92 pada rpm 5000 sebesar 0,66%. Untuk hasil emisi hidrokarbon terendah saat menggunakan timing awal pengapian 10 BTDC pada 5000rpm sebesar 28ppm dan oktan number 92 pada rpm 5000 sebesar 80ppm. Sehingga dapat disimpulkan ada perbedaan kendali ECU EFI saat pengapian pada berbagai oktan number terhadap emisi karbonmonoksida dan emisi hidrokarbon.
PENGARUH PRESTASI PRAKERIN, PRESTASI BELAJAR SISWA DAN BAKAT MEKANIK TERHADAP KESIAPAN KERJA SISWA
Authors: Wicaksono Tri Putra , Paryono Paryono , Irdianto Windra
Published: March 2022

Pada dasarnya terdapat dua faktor yang mempengaruhi kesiapan kerja yakni faktor eksternal dan faktor internal. Penelitian ini bertujuan untuk mengetahui pengaruh positif dan signifikan prestasi prakerin, prestasi belajar, dan bakat mekanik terhadap kesiapan kerja siswa. Rancangan penelitian yang digunakan dalam penelitian ini adalah pendekatan kuantitatif dan jenis penelitian explanatory kuantitatif. Populasi dari penelitian ini adalah siswa kelas XII Kompetensi Keahlian Teknik Kendaraan Ringan di SMKS Pangeran Antasari Balikpapan. Berdasarkan analisis data, hasil penelitian ini menunjukkan bahwa terdapat pengaruh positif dan signifikan prestasi prakerin, prestasi belajar siswa, dan bakat mekanik secara parsial maupun simultan terhadap kesiapan kerja.
PENGARUH PERUBAHAN IGNITION TIMING DAN TEKANAN KOMPRESI TERHADAP EMISI HC DAN CO PADA SEPEDA MOTOR TYPE MESIN SOHC 150CC INJEKSI
Authors: Arifiyanto Dimas , Marji Marji , Irdianto Windra
Published: March 2022

Pemerintah telah mengeluarkan regulasi tentang standar emisi gas buang. Salah satu upaya untuk meminimalisir kandungan HC dan CO pada emisi dilakukan modifikasi pada sistem pengapian dan tekanan kompresi dimana sistem pengapian sangat berpengaruh pada emisi gas buang. Tujuan dari penelitian ini adalah membandingkan perbedaan jumlah HC dan CO yang signifikan pada sepeda motor bertipe mesin SOHC 150cc injeksi setelah merubah ignition timing, memodifikasi tekanan kompresi, memodifikasi igninition timing dimundurkan dan tekanan kompresi standar, memodifikasi igninition timing dimundurkan dan tekanan kompresi diperbesar, memodifikasi igninition timing dimajukan dan tekanan kompresi standar dan setelah memodifikasi igninition timing dimajukan dan tekanan kompresi diperbesar. Metode yang digunakan pada penelitian ini adalah metode penelitian eksperimental. Hasil dari penelitian tersebut adalah sebagai berikut. 1) Ada perbedaan jumlah HC dan CO setelah dilakukan perubahan ignition timing. 2) Ada perbedaan jumlah HC dan CO setelah dilakukan perubahan tekanan kompresi. 3) Ada perbedaan jumlah HC dan CO saat ignition timing dimundurkan dan tekanan kompresi standar. 4) Ada perbedaan jumlah HC dan CO saat ignition timing dimundurkan dan tekanan kompresi diperbesar. 5) Ada perbedaan jumlah HC dan CO saat ignition timing dimajukan dan tekanan kompresi standar. 6) Ada perbedaan jumlah HC dan CO saat ignition timing dimajukan dan tekanan kompresi diperbesar.
PENGARUH KETERAMPILAN MENGAJAR TERHADAP PRESTASI BELAJAR SISWA SMK DI KABUPATEN MALANG
Authors: Wicaksono Bayu Iskhak , Partono Partono , Sholah Agus
Published: March 2022

Keterampilan Mengajar Guru sangat mempengaruhi Prestasi Belajar Siswa. Keberhasilan lembaga pendidikan diketahui dengan mengukur prestasi belajar. Keterampilan mengajar berpengaruh dalam kegiatan bejalar mengajar. Sifat yang mendasar yang dimilik oleh guru yaitu keterampilan guru dalam mengajar akan membuat siswa yang diampu atau diberikan pelajaran merasa nyaman, termotivasi dan semangat untuk memperhatikan guru saat memberikan materi dari sumber buku atau bahan ajar materi yang akan disampaikan serta menumbuhkan motivasi  belajar dalam diri siswa untuk memperkuat materi dari sumber belajar yang akan dicapai. Prestasi belajar akan tercapai jika tujuan kegiatan pembelajaran didukung oleh ketrampilan dalam mengajar. Penelitian ini dutujukkan pada pengaruh keterampilan mengajar yang akan mempengaruhi hasil atau prestasi belajar siswa tersebut. Sebanyak 60 siswa SMK Brantas Karangkates berpartisipasi sebagai responden. Pengumpulan data menggunakan angket on-line dengan bantuan google form. Hasilnya menunjukkan sebagian besar siswa memberikan persepsi yang positif. Dari penelitian ini didapatkan hasil data tertinggi pada keterampilan mengajar kategori terampil. Sehingga dapat disimpulkan ada yang mempengaruhi prestasi belajar yaitu keterampilan mengajar.
PERBEDAAN OLI KOMPRESOR TERHADAP TEMPERATUR EVAPORATOR PADA SISTEM PENDINGIN AC DI MOBIL
Authors: Abdillah Agung , Marji Marji , Mindarta Erwin Komara
Published: March 2022

Permasalahan yang ditimbulkan karena kesalahan dalam pemilihan oli yang tidak sesuai. Nilai viskositas yang sesuai agar pelumasan bertahan di suhu yang tinggi dan tidak mudah rusak Jika pelumas tidak bisa bersirkulasi dengan baik maka dampak yang ditimbulkan komponen pada kompresor karena fungsi pelumasan tidak maksimal. Salah satu kerusakan pada kompresor adalah terjadi keausan beberapa bagian. Penyebab kerusakan tersebut adalah oli kompresor yang tidak sesuai sehingga suara kompresor akan menjadi kasar. Salah satunya adalah oli ikut bersirkulasi di dalam kompresor AC. Macam-macam jenis oli yang beraneka ragam tersebut tentunya memiliki pengaruh yang berbeda terhadap kinerja kompresor itu sendiri. Tujuan dilakukaknnya  penelitian ini untuk membandingkan penggunaan oli ND Oil 8, oli suniso, oli emkarate kompresor terhadap temperatur evaporator. Alat yang digunakan untuk melakukan pengetesan yaitu thermo gun untuk mengukur temperatur evaporator. Dari penelitian ini dihasilkan oli kompresor nd oil 8 didapatkan temperatur didalam mobil sebesar 3,58°C, pada penggunaan oli kompresosr jenis suniso didapatkan temperatur didalam mobil sebesar 5,24°C dan jenis oli emcarate didapatkan temperatur didalam mobil sebesar 4,2°C. Sehingga dapat disimpulkan bahwa terdapat perbedaan yang signifikan antara jenis oli kompresor terhadap temperatur evaporator.
VARIASI DIAMETER KATUP HISAP DAN KATUP BUANG TERHADAP DAYA DAN KONSUMSI BAHAN BAKAR PADA SEPEDA MOTOR 110CC
Authors: Rofi’i Angga Dihar , Sumarli Sumarli , Putra Andika Bagus Nur Rahma
Published: March 2022

Hasil penelitian ini untuk mengetahui pengaruh daya dan konsumsi bahan bakar pada sepeda motor 110cc melalui variasi diameter katup hisap dan katup buang. Metode penelitian ini memakai eksperimen semu dengan model desain Randomized kontrol-grup only design. Berdasarkan hasil analisis data daya dihasilkan nilai signifikansi 0,000. Pada pengujian konsumsi bahan bakar didapatkan nilai signifikansi sebesar 0,000. Dari hasil analisis data tersebut melihatkan bahwasanya nilai signifikansi <0,05, maka ditarik kesimpulan ada pengaruh secara signifikan dengan variasi diameter katup hisap dan katup buang terhadap daya dan konsumsi bahan bakar. Hasil pengujian menunjukkan variasi diameter katup hisap 23mm dan katup buang 21mm memiliki daya dan konsumsi bahan bakar secara signifikan di kecepatan 60 km/h dan 80 km/h.
PERBEDAAN PENGGUNAAN TRANSISTOR CONTROLLED IGNITION (TCI) DAN PLATINA TERHADAP KONSUMSI BAHAN BAKAR PADA MOTOR BENSIN SEBARIS 4 SILINDER 4 LANGKAH 1500 CC
Authors: Sulisdiantoro Cahyo Bagus , Nauri Imam Muda , Mindarta Erwin Komara
Published: March 2022

Sistem pengapian konvensional platina berfungsi untuk menghasilkan arus listrik tegangan tinggi pada kumparan sekunder dengan cara induksi elektromaknet dan menghubungkan serta memutus arus listrik yang mengalir melalui kumparan primer pada pengapian. Dengan sistem TCI (Transistor Controlled Ignition) yang diletakkan di motor bensin sebaris 4 silinder 4 langkah 1500 CC tersebut diharapkan dapat meminimalisir konsumsi bahan bakar. Karena kerja dari platina dibantu oleh TCI (Transistor Controlled Ignition) sehingga plat platina bisa bekerja secara tepat untuk memutus arus dan menghubungkan arus pada plat platina. Apabila aliran listrik untuk menyalakan pengapian maksimal maka bisa membuat pembakaran lebih sempurna dan secara teratur. Tujuan dilakukaknnya  penelitian ini untuk mengetahui perbedaan penggunaan Transistor Controlled Ignition (TCI)  dan platina terhadap konsumsi bahan bakar pada motor bensin sebaris 4 silinder 4 langkah 1500 cc Alat yang digunakan untuk mengukur konsumsi bahan bakar yaitu gelas ukur. Dari penelitian ini konsumsi bahan bakar yang menggunakan TCI pada RPM 3000 dihasilkan 297 ml/s, sedangkan pada pengapian platina pada RPM 3000 dihasailkan 313 ml/s. Sehingga dapat disimpulkan bahwa terdapat perbedaan penggunaan Transistor Controlled Ignition (TCI)  dan platina terhadap konsumsi bahan bakar pada motor bensin sebaris 4 silinder 4 langkah 1500 cc.
PERBEDAAN HASIL BELAJAR SISTEM PENGAPIAN KONVENSIONAL MENGGUNAKAN METODE PEMBELAJARAN DEMONSTRASI DAN CERAMAH PADA KELAS XI TKR DI SMK NEGERI 1 JABON
Authors: Muminin Moch Amiril , Suhartadi Syarif , Partono Partono
Published: March 2022

Pada penelitian ini bertujuan mengetahui perbedaan hasil belajar pada peserta didik yang menggunakan metode pembelajaran ceramah dan menggunakan metode pembelajaran demonstrasi, penelitian ini menggunakan pendekatan kuantitatif untuk menguji hipotesis, Pada penelitian yang dilakukan ini menggunakan suatu rancangan dengan penelitian ( Two Groups Posttest Design )  yaitu memakai suatu pendekatan kuantitatif dengan menggunakan metode quasi eksperiment, Penelitian ini menggunakan kelas TKR 1 & 2 (Teknik Kendaraan Ringan) yang berjumlah 66 peserta didik dari kedua kelompok kelas tersebut terpilih dari segi kemampuan akademik mempunyai ciri yang sama yaitu jurusan otomotif serta akan memperoleh suatu perlakuan dari segi yang sama antara seorang pendidik(guru) dan materi pembelajaran yang diberikan. Metode yang digunakan dalam pengambilan data yaitu berupa angket tes, dan dokumentasi. Berdasarkan hasil kajian yang diperoleh terdapat perbedaan dari nilai hasil belajar antara kelas diberikan suatu metode pembelajaran demonstrasi dan metode pembelajaran ceramah  pada siswa kelas XI Teknik Kendaraan Ringan di SMK Negeri 1 Jabon.
PERBEDAAN PENGGUNAAN VARIAN BERAT PISTON DATAR TERHADAP DAYA, AKSELERASI DAN KONSUMSI BAHAN BAKAR PADA SEPEDA MOTOR 4 TAKT 110 CC SOHC
Authors: Ashari Muhammad Rofik , Nauri Imam Muda , Mindarta Erwin Komara
Published: March 2022

Penelitian ini bertujuan untuk mengetahui perbedaan penggunaan varian berat piston datar terhadap daya, akselerasi dan konsumsi bahan bakar pada sepeda motor 4 takt 110 CC SOHC. Penelitian ini menggunakan metode eksperiment dengan desain Quasi Eksperimental melalui pendekatan kuatitatif. Variabel yang diuji terdiri dari variabel independent berupa varian berat piston datar (91 gram, 87 gram dan 83 gram), sedangkan variabel dependent berupa daya, akselerasi dan konsumsi bahan bakar. Objek penelitian yang digunakan berupa sepeda motor Yamaha Jupiter Z 110 CC SOHC. Berdasarkan hasil pengujian dapat diketahui bahwa daya mesin yang menggunakan berat piston standart 91 gram pada putaran mesin 8000 rpm menghasilkan 8,925 HP, piston custom 87 gram menghasilkan 9,01 HP, dan piston custom 83 gram menghasilkan 9,05 HP. Sedangkan akselerasi mesin yang menggunakan berat piston standart 91 gram pada kecepatan 70-80 km/jam menghasilkan 8,28 m/s2, piston custom 87 gram menghasilkan 8,30 m/s2, piston custom 83 gram menghasilkan 8,32 m/s2. Sementara konsumsi bahan bakar mesin yang menggunakan berat piston standart 91 gram pada putaran mesin 8000 rpm menghasilkan 20,00 ml/detik, piston custom 87 gram menghasikan 20,36 ml/detik dan piston custom menghasilkan 20,40 ml/detik. Berdasarkan hasil uji statistik menggunakan analisis One Way Anova dapat disimpulkan bahwa penggunaan varian berat piston datar tidak menunjukkan perbedaan yang signifikan terhadap daya, akselerasi dan konsumsi bahan bakar pada sepeda motor 4 takt 110 CC SOHC.
PENGARUH MODIFIKASI UKURAN LUBANG INTAKE MANIFOLD TERHADAP KONSUMSI BAHAN BAKAR DAN PERFORMANSI KENDARAAN SEPEDA MOTOR HONDA 4 TAK 125CC
Authors: Rokhman Krishna Nur , Sumarli Sumarli , Paryono Paryono
Published: March 2022

Tujuan dari penelitian ini adalah mengetahui pengaruh modifikasi ukuran lubang intake manifold terhadap konsumsi bahan bakar dan performansi (daya dan torsi) pada sepeda motor Honda SupraX 125cc. Penelitian ini menggunakan pendekatan kuantitatif dengan jenis experimental. Variabel bebas pada penelitian ini berupa ukuran lubang intake manifold dan variable terikat berupa konsumsi bahan bakar dan performansi (daya dan torsi). Objek yang digunakan pada penelitian ini adalah sepeda motor Honda SupraX 125cc. Teknik analisis penelitian ini dilakukan dengan metode statistik uji F dengan menggunakan one way ANOVA dengan bantuan  software IBM SPSS for windows. Sesuai dengan hasil penelitian yang telah dilakukan menunjukkan bahwa: (1) Tidak ada pengaruh yang signifikan dari modifikasi ukuran lubang intake manifold terhadap konsumsi bahan bakar mesin Honda SupraX 125cc. (2) Tidak ada pengaruh yang signifikan dari modifikasi ukuran lubang intake manifold terhadap daya mesin Honda SupraX 125cc. (3) Tidak ada pengaruh yang signifikan dari modifikasi ukuran lubang intake manifold terhadap torsi mesin Honda SupraX 125cc. Dari hasil penelitian ini diketahui bahwa modifikasi ukuran lubang intake manifold tidak ada pengaruh yang signifikan terhadap konsumsi bahan bakar dan performansi (daya dan torsi).
Comparison of Different Artificial Neural Network Methods in Determining Reservoir Capacity
Authors: TEMİZ Temel , DAMLA Yunus , KESKİN Erdinç
Published: March 2022

Making estimation of river flow with hydrological and methodological data of the past period and using in water resources project studies have been used for a long time in many studies in our country and in the world. In addition to this, along with frequent drought problems in recent years, it is also important to store and use the water in the reservoirs correctly. This study aims to research how two separate Artificial-Neural-Network-Functions, which are generated based on the study of neural networks in the human brain, can be used in areas with a certain reservoir capacity such as dams or ponds and to provide an example of the most appropriate ANN model for predicting the level changes that will occur depending on the next years. In this context, two separate functions have been evaluated. These are the Levenberg-Marquardt-(LM) training function and Gradient-Descent-with-Momentum(GDM) training functions. Here, instead of the best results obtained from the models, the best three model outputs were evaluated and the models were considered from a wide frame. Gökçe dam basin in Marmara region was selected as the Model Study Area. For the period of December 31, 2019 - January 1, 2000, the monthly average data prepared with daily data from DSI and different architectural ANN training models were used to forecast the monthly basin capacities for 2019. It can be stated that LM Training models created in terms of Basin reservoir level estimates give results closer to the measured value.
The Impact of Organizational Socialization and Career Development on Intention to Change Work in Public Companies in Pakistan
Authors: Purnomo Singgih , Utami Indah Wahyu , Gill Atif Ali
Published: March 2022

Research aims: This study aims to discuss the impact of socialization about organizational goals and career development on intention to change jobs with coaching and career development as a moderating role.Design/Methodology/Approach: This research data were obtained from public companies involved in providing products and services to their customers. There were 400 respondents selected to be given a questionnaire that included closed questions, and 378 questionnaires were selected for further analysis. The sampling technique used was purposive sampling. Both differentiation and regression studies were employed in evaluating the relationship between the independent and dependent variables by SPSS software.Research findings: The results of this study revealed that there was a positive relationship between organizational socialization and career development. Besides, it was also found that there was a negative relationship between the purpose of structural socialization and the intention of changing jobs. Theoretical contribution/Originality: The moderating role of coaching and employee progress strengthens the relationship between organizational socialization and career development. This study uncovered that the organizational socialization component was closely related and consistently increased employee loyalty.Practitioner/Policy implication: The results of this study are good news for managers because the board of directors has a very significant role in socializing the organization.Research limitation/Implication: The scope of this research itself is relative and insignificant due to the limited number of samples. Thus, expanding the sample size and adding a wider area will be able to strengthen the results of this study. New research should be designed to investigate various career development programs that can increase employee loyalty so that it is not easy to change jobs. Organizational managers are also encouraged to innovate in creating and supporting employee career development, especially for novice employees, by providing various experiences to facilitate their career development.
Pengaruh Grain Size Arang Aktif dari Bahan Limbah Industri Sagu Aren terhadap Penyerapan Polutan Limbah Batik
Authors: Kuncoro Diharjo Sudarja , Novi caroko ,
Published: March 2022

Sago palm industries leave large amount of wood waste that is about 30% of the volume of tree trunks, 20% in large size which can be used for the handcraft and about 10% in small-size which only wasted. On the other hand, batik industries produce hazardous and toxic waste (B3), that should be neutralized since this liquid waste are bad smell and  hard color, and even toxity  (contain various kinds of chemical elements and heavy metals such as Mercury (Hg), Lead (Pb), Chromium (Cr), Cadmium (Cd), and Copper (Cu)) and if the elements are absorbed by human body exceeds the threshold point, it would be dangerous. Therefore, experiment on activated carbon engineering and its use in adsorbing the B3 batik liquid waste is urgently required.  The main objective of the experiment is to know the adsorbsion effectivity of activated carbon in adsorbing the batik liquid waste. The main material used in producing activated carbon is waste palm tree trunks. The main material is heated to be charcoal in retort for about 5 hours, temperature around 500 º C. Furthermore, charcoal is crushed finely and screened in sizes of mesh 25, 35 and 50. Carbon powder then chemically activated using H2SO4 solution by heating in 500 ˚C for about 30 menutes. Finally this activated carbon used for adsorbing the hard colour and heavy metal (Pb, Cr, Cd) in the batik waste water. This research concluded that the sago aren industrial waste may be an alternative material for activated carbon which is effective in adsorbing the hard colour and hazardous heavy metal. Higher mesh size (grain size) of activated carbon give higher adsorbsion in colour and heavy metal. Activated carbon in mesh 25 adsorbed  68.59% Cd, 16.65% Cr, and 100% Pb, mesh 35 adsorb  76.25% Cd, 37.55% Cr and Pb at 100%, while mesh 50 adsorb 81.61% Cd, 58,33% Cr, and 100%  Pb.
Perancangan Robot Pemadam Api Divisi Senior Berkaki
Authors: Helman Muhammad Latif Hidayat Iswanto
Published: March 2022

The main objective of this study is to use a good method to control the robot that capable of detecting the presence of light and avoiding obstacles in front of the robot without hitting the obstacles that may obstruct it. Legged robot uses sensors to detect the presence of photodioda the firelight and ultrasonic sensors (PINGTM) is to detect the presence or absence of obstacles so that legged robots are able to walk without bumping into obstacles that may obstruct it. A servo motor was used for driving the wheel of the feet. In this research, legged robots have been able to go scour the walls and extinguish the fire.
Interpretasi Letak Bidang Longsor dan Faktor Aman Lereng dengan Bahasa Pemrograman MATLAB
Authors: Anita Widianti Joko Supriyadi ,
Published: March 2022

Slope stability analyses can be performed using computer program, such as Matrix Laboratory (MATLAB). In the current work, a computer program for slope stability analysis named JOZLOPE based on MATLAB and using Bishop simplified analysis method was used to determine the location of a slip surface and its safety factor. The validation is carried out by analyzing three simple slope models and comparing their results by JOZLOPE and some comparator slope stability analysis programs. It is found that the variations between JOZLOPE’s results and those of the comparators are less than 1% for bottom circle-slope geometry intersection, less than 7% for top circle-slope geometry intersection  and less than 4% for Safety Factor. These findings demonstrates  that the a MATLAB program is successfully compiled and it produced measured values that agree with those of their respective comparator.
Perpindahan Kalor pada Penukar Kalor Selongsong dan Pipa Memakai Sekat Miring Tidak Sejajar
Authors: Nadjib Muhammad
Published: March 2022

Generally speaking, baffle installation of a shell-and-tube heat exchanger is in straight-standing with respect to shell axis. A common problem of this arrangement is that there will be found a stagnant fluid condition in the death-zone. The impact is the heat transfer coefficient could not reach an optimum value. Based on baffle configuration, the death-zone effect can be minimized by installing an un-parallel tilted baffle. The purpose of this research is to investigate the effect of using non-parallel tilted baffle on heat transfer coefficient. The heat exchanger model was made with single pass fluids. Hot water is going through inside the tube bundles and cold water pass is in the shell. The baffle was installed in various angle of 0°, 15°, 30°, and 45° with respect to shell axis. The cold water flow rates were varied from 75 l/hr, 100 l/hr, 125 l/hr, 150 l/hr, 175 l/hr, to 200 l/hr. The hot water flow rate was fixed at 150 l/hr. Temperature of the hot and cold water at inlet and outlet was recorded by means of K type thermocouple and data logger. The data was then analyzed to obtain the convection heat transfer coefficient. The data were also used to determine the empirical correlation of Nusselt number and Reynolds number. The results indicate that baffle in angle 0° produce the highest convection heat transfer coefficient. Installing the baffle at tilted position is not significant in convection heat transfer coefficient. The empirical correlation of Nusselt number and Reynolds number is influenced by angle function of the baffle.
Kaji Eksperimental Efektifitas Penyerapan Limbah Cair Industri Batik Taman Sari Yogyakarta Menggunakan Arang Aktif Mesh 80 dari Limbah Gergaji Kayu Jati
Authors: Novi Caroko Sudarja ,
Published: March 2022

Utilization of teak wood saw scratches can be optimized by processing it becomes active charcoal which possesses higher economic value. The purpose of this study is to obtain mesh 80 activated charcoal made from teak sawing industrial waste and to determine it’s effectiveness in adsorbing heavy metals pollutant Cd, Pb, Cr, and colouring agent in liquid waste of batik industries. The charcoal is produced at ~5000 oC retort either for 4 hours or until white colour smoke does not appear. Charcoal was activated using H2SO4 at temperature of 5000 oC for 30 minutes in a furnace. There were 2 variables in this study, i.e weight of the activated charcoal (10, 15, 20 grams) and duration of the stirring (5, 10,15 minutes). Result of the research shows that activated charcoal made from teak wood saw scratches can be used as adsorbent in the liquid waste of batik industries such as heavy metals Cd, Pb, Cr, and dark colour. The colour gradation was found to decrease from 12600 TCU to 198 TCU, Pb content decrease from 0,189 mg/l to less than 0,0093 mg/L, Cd content decrease from 0,213 mg/l to less than  0,0093 mg/L, while Cr content decrease from 2,03 mg/l to 0,4205 mg/l.
Pengaruh Penggunaan Bambu Sebagai Pengganti Agregat Split terhadap Kuat Tekan Beton Ringan
Authors: Pujianto As’at , Tajuddin M.
Published: March 2022

The use of bamboo as an aggregate replacement is one of the efforts to reduce the density and static load of structural elements, sincethe structural strength of bamboo is high. This study focus on the issue of the using bamboo as aggregate concrete with flowing method on a review of specific gravity and compressive strength of the concrete. This study uses bamboo as a percentage of the aggregate at 0% (normal), 20%, 40%, 60%, 80% and 100% of the conventional split and using additional silicafume aggregates. Specimens used in this study is the concrete cylinder (diameter 15 cm and height 30 cm). The identification and testing of tap density after 14 days of treatment.Results show that using more bamboo aggregate will result lower slump value, higher water absorption, decreasing in both specific gravity and compressive strength.