scholarly journals Benefits of Exergy-Based Analysis for Aerospace Engineering Applications—Part I

2009 ◽  
Vol 2009 ◽  
pp. 1-11 ◽  
Author(s):  
John H. Doty ◽  
José A. Camberos ◽  
David J. Moorhouse
Keyword(s):  
Complex System ◽  
Research And Development ◽  
Operating Conditions ◽  
Aerospace Engineering ◽  
The Other ◽  
System Level ◽  
Exploratory Research ◽  
Design Paradigm ◽  
Analysis Design ◽  
Level Performance

This paper compares the analysis of systems from two different perspectives: an energy-based focus and an exergy-based focus. A complex system was simply modeled as interacting thermodynamic systems to illustrate the differences in analysis methodologies and results. The energy-based analysis had combinations of calculated states that are infeasible. On the other hand, the exergy-based analyses only allow feasible states. More importantly, the exergy-based analyses provide clearer insight to the combination of operating conditions for optimum system-level performance. The results strongly suggest changing the analysis/design paradigm used in aerospace engineering from energy-based to exergy-based. This methodology shift is even more critical in exploratory research and development where previous experience may not be available to provide guidance. Although the models used herein may appear simplistic, the message is very powerful and extensible to higher-fidelity models: the 1st Law is only anecessarycondition for design, whereas the 1st and 2nd Laws provide thesufficiencycondition.

scholarly journals Developing Writing Module for the Fourth-Semester Learners of English Department at State Islamic Institute of Palopo

2020 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Andi Tenrisanna Syam
Keyword(s):  
Research And Development ◽  
The State ◽  
The Other ◽  
English Department ◽  
The Media ◽  
Analysis Design ◽  
Addie Model ◽  
Academic Year

This research aimed to develop an appropriate module based on the writing needs of the learners. The author took the fourth-semester learners of the English Department at the State Islamic Institute of Palopo in the academic year 2018/2019. The author involved 40 learners as her participants. The method of the research was Research and Development. The author used the ADDIE model. The ADDIE model consisted of five stages, namely analysis, design, develop, implementation and evaluation. The instruments of the research were questionnaires and documents. The data were analyzed quantitatively qualitatively. The results of the content, the design, and the media experts validation showed that the module got good and very good category. The writing I module quality based on the learners’ response in the field try-out showed that 75% of learners very agree and 25% of learners agree with the materials presented in the module. The result of this research hopefully gives a contribution to some parties, especially to the writing I lecturers and to the other researchers.

System Level Performance and Emissions Evaluation of Renewable Fuels for Jet Engines

2014 ◽  
Author(s):  
Kadambari Lokesh ◽  
Vishal Sethi ◽  
Theoklis Nikolaidis ◽  
Devaiah Karumbaiah
Keyword(s):  
Engine Performance ◽  
Operating Conditions ◽  
System Level ◽  
Civil Aviation ◽  
Jet Engines ◽  
Stirred Reactor ◽  
Fuel Burn ◽  
Performance And Emissions ◽  
Aircraft Performance ◽  
Level Performance

Incessant demand for fossil derived energy and the resulting environmental impact has urged the renewable energy sector to conceive one of the most anticipated sustainable, alternative “drop-in” fuels for jet engines, called as, Bio-Synthetic Paraffinic Kerosene (Bio-SPKs). Second (Camelina SPK & Jatropha SPK and third generation (Microalgae SPK) advanced biofuels have been chosen to analyse their influence on the behaviour of a jet engine through numerical modelling and simulation procedures. The thermodynamic influence of each of the biofuels on the gas turbine performance extended to aircraft performance over a user-defined trajectory (with chosen engine/airframe configuration) have been reported in this paper. Initially, the behaviour of twin-shaft turbofan engine operated with 100% Bio-SPKs at varying operating conditions. This evaluation is conducted from the underpinning phase of adopting the chemical composition of Bio-SPKs towards an elaborate and careful prediction of fluid thermodynamics properties (FTPs). The engine performance was primarily estimated in terms of fuel consumption which steers the fiscal and environmental scenarios in civil aviation. Alternative fuel combustion was virtually simulated through stirred-reactor approach using a validated combustor model. The system-level emissions (CO2 and NOx) have been numerically quantified and reported as follows: the modelled aircraft operating with Bio-SPKs exhibited fuel economy (mission fuel burn) by an avg. of 2.4% relative to that of baseline (Jet Kerosene). LTO-NOx for the user-defined trajectory decreased by 7–7.8% and by 15–18% considering the entire mission. Additionally, this study reasonably qualitatively explores the benefits and issues associated with Bio-SPKs.

scholarly journals Pengembangan Mobile Learning Barusikung Berbasis Android pada Materi Bangun Ruang Sisi Lengkung

2020 ◽  
Vol 9 (3) ◽  
pp. 475-486
Author(s):  
Yesica Yesi Rachma ◽  
Danang Setyadi ◽  
Helti Lygia Mampouw
Keyword(s):  
Research And Development ◽  
Mobile Learning ◽  
The Other ◽  
Design Development ◽  
Is Research ◽  
Solid Geometry ◽  
The Media ◽  
Analysis Design ◽  
Addie Model

AbstrakMatematika merupakan salah satu pelajaran yang penting untuk dikuasai siswa di sekolah khususnya pada materi pemahaman bentuk dan ruang, meskipun demikian masih banyak siswa yang mengalami kesulitan dalam mempelajari materi tersebut. Hal inilah yang mendorong peneliti untuk mengembangkan suatu aplikasi Mobile learning pada materi Bangun Ruang Sisi Lengkung. Penelitian ini merupakan penelitian pengembangan dengan menggunakan model ADDIE. Langkah-langkahnya terdiri dari: Analysis, Design, Development, Implementation, dan Evaluations. Hasil penelitian menunjukkan bahwa media yang dikembangkan valid dan praktis. Hasil uji coba terhadap 10 siswa menunjukkan bahwa media masuk dalam kategori baik. Selain itu Mobile learning mampu meningkatkan hasil belajar siswa, hal ini dapat dilihat dari hasil pretest dan posttest yang menunjukkan nilai signifikan. Mobile learning dapat membantu siswa memahami bentuk dan ruang pada materi Bangun Ruang Sisi Lengkung.  The Expansion of Mobile Learning Barusikung Base Android on Solid GeometryAbstractMathematics is one of the important subjects that students having to do in school especially to know shapes and geometry, although it is important to learn, many students still have difficulties in studying the material. It promotes the researcher to encourage an application of Mobile learning to solid geometry. This research is research and development using the ADDIE model. The step consists of Analysis, Design, Development, and Evaluations. The results show that the developed media is valid and practical. The trial results to ten students show that the media is good. The other than Mobile learning can increase students learning, it can be seen by pretest and posttest results that show significant value. Mobile learning can help students understand the form and space in the material of solid geometry. 

scholarly journals Systems Engineering in Terms of Exergy

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
José A. Camberos ◽  
David J. Moorhouse
Keyword(s):  
Systems Engineering ◽  
Energy Systems ◽  
System Of Systems ◽  
System Level ◽  
Exergy Destruction ◽  
Aerospace Vehicles ◽  
Design And Optimization ◽  
Design Paradigm ◽  
Analysis Design ◽  
The Individual

We address the design of a flight vehicle from the viewpoint of a system of systems and we discuss the integration of the individual technical disciplines. Then a conceptual fundamental methodology and tools required for the analysis, design, and optimization of aerospace vehicles in terms of the efficient use of on-board energy are discussed. This suggests changing the design paradigm to the optimization of a system of energy systems. We propose a foundation for system-level design with optimization based on minimum exergy destruction.

PENGEMBANGAN LEAFLETSEBAGAI BAHAN AJAR MATERI TEKS EKSPLANASI KELAS XI SMK NEGERI 3 MEDAN TAHUN PEMBELAJARAN 2017/2018

Basastra ◽  
2018 ◽  
Vol 7 (4) ◽  
Author(s):  
Weni Agustianingsih ◽  
Rosmaini Rosmaini
Keyword(s):  
Research And Development ◽  
Design Development ◽  
Analysis Design

Tujuan penelitian ini adalah untuk (1) Mengembangkan bahan ajar leaflet pada materi materi teks eksplanasi di kelas XI SMK Negeri 3 Medan Tahun Pembelajaran 2017/2018, (2) mendeskripsikan kelayakan leaflet dalam materi teks eksplanasi untuk meningkatkan pembelajaran yang valid sesuai dengan syarat kelayakan leaflet kelas XI SMK Negeri 3 Medan Tahun Pembelajaran 2017/2018. Penelitian ini menggunakan sampel 29 orang peserta didik dengan metode R&D (Research and Development) dengan model ADDIE (Analysis, Design, Development, Implementation, and Evaluation).Hasil penelitian Leaflet sebagai bahan ajar materi teks eksplanasi siswa kelas XI SMK Negeri 3 Medan Tahun Pembelajaran 2017/2018 tergolong kategori “Sangat Baik”. Berdasarkan rata-rata penilaian dari ahli materi 95.27% (kelayakan isi materi 93,33%, kelayakan penyajian 92,5%, dan kelayakan bahasa 100%) dan ahli desain 90.66%. Selanjutnya diperkuat hasil uji coba bahan ajar leaflet pada 29 orang siswa dibagi menjadi dua tahap yaitu uji coba skala kecil, dan uji coba skala besar. Dengan demikian dapat disimpulkan bahwa leaflet yang dikembangkan dapat digunakan sebagai alternatif pembelajaran dan layak digunakan.

PENGEMBANGAN MODUL BIMBINGAN KARIR SEBAGAI UPAYA MENINGKATKAN PEMAHAMAN ARAH KARIR PADA MAHASISWA TINGKAT AKHIR

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Eko Perianto ◽  
Arum Setiowati
Keyword(s):  
Research And Development ◽  
Design Development ◽  
Analysis Design

Penelitian ini bertujuan untuk menghasilkan media berupa Modul Bimbingan Karir sebagai upaya meningkatkan pemahaman arah karir pada mahasiswa tingkat akhir serta untuk mengetahui respon mahasiswa terhadap Modul Bimbingan Karir yang dikembangkan. Penelitian ini merupakan penelitian pengembangan (Research and Development/R&D) yang menggunakan model ADDIE (Analysis, Design, Development, Implementation, and Evaluation). Prosedur yang digunakan dalam penelitian ini meliputi tahap analisis, tahap perancangan, tahap pengembangan, tahap implementasi, dan tahap evaluasi. Hasil penelitian ini menunjukkan sig. (2-tailed) 0,000 sehingga bila dilihat dari kriteria uji maka 0,000 < 0,05, sehingga H0 ditolak. Selanjutnya Skor sebelum mengikuti bimbingan karir jumlah Mean 27.69 dan skor setelah mengikuti bimbingan karir jumlah Mean 34.54. Dengan demikian dapat dikemukakan bahwa bimbingan karir yang dilakukan dengan menggunakan isi modul pemahaman arah karir mahasiswa tingkat akhir yang dikembangkan melalu layanan bimbingan klasikal dapat meningkatkan pemahaman arah karir mahasiswa tingkat akhir. Kata kunci: modul bimbingan karir, pemahaman karir, mahasiswa

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