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Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Published by Universitas Negeri Semarang
ISSN : 02165631     EISSN : 25276964     DOI : https://doi.org/10.15294/rekayasa
Core Subject : Engineering,
Engineering
REKAYASA journal publishes exciting articles from all fields of research and Engineering Science. The journals primary focus is on research practice and engineering processes utilizing biomass or factory waste. The engineering journal is an open-access peer-reviewed journal that publishes articles from all areas of Engineering and Science research.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 313 Documents
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Synthesis and Characterization of Graphene Using Coconut Shell Charcoal Sholehah, Amalia; Vinanza, Naufal Eka; Huda, Nurul; Rengga, Wara Dyah Pita
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 1 (2020): July
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i1.22952

Abstract

Coconut shell waste has great potential as a source of carbon in the future. Graphite is one of the carbon allotropes with layers of planar layered carbon atoms. One layer of graphite is called graphene with hexagonal carbon atomic structure. In this study, the Hummers method was used to obtain graphene from coconut shell waste. This method breaks the bonding graphite layer into graphene by utilizing the process of mixing a mixture of graphite and HCl solution with the addition of KMnO4 and NaNO3. Raman Spectroscopy characterization shows the formation of multilayer graphene with D, G, and 2D values in 1365, 1585, and 2865 cm-1. The Fourier Transform Infrared Spectroscopy characterization confirmed the bonds of C-O, C = C and C = O at 1220, 1580, and 1700 cm-1. Meanwhile, X-Ray Diffraction characterization showed a peak of diffraction of graphene at 2θ at 11.6o; 23.9o; and 43.5o. The graphene produced becomes more transparent with the length of time of stirring, and the smaller the size of the graphite particles results in the irregularity of the graphene crystal structure.
PENGEMBANGAN UMKM MADUMONGSO DENGAN PEMANFAATAN DANA DESA Sokhibi, Akh.; Alifiana, Mia Ajeng
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 16, No 2 (2018): Desember 2018
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v16i2.17502

Abstract

Madumongso adalah salah satu makanan khas Kudus, berbahan dasar ketan hitam, yang identik dihidangan pada Idul Fitri. Perkembangan madumongso tidak sepesat jenang yang telah menjadi oleh-oleh khas Kudus. Oleh karena itu, pembinaan  UMKM madumongso perlu ditingkatkan. Peningkatan  pembinaan tersebut adalah dengan memanfaatkan dana desa, yang salah satu peruntukannya adalah untuk pembinaan masyarakat dan pemberdayaan masyarakat. Pembinaan UMKM madumongso dengan memanfaatkan dana desa pada pengabdian ini dilakukan pada UMKM madumongso di Desa Ngembalrejo, Kecamatan Bae, Kabupaten Kudus. Tujuan kegiatan pengabdian ini adalah 1) adanya peningkatan pengetahuan pelaku UMKM akan pemanfaatan dana desa untuk usaha; 2) peningkatan keterampilan mitra dalam pengemasan produk yang aman  dan lebih berdaya jual. Pengabdian ini dilakukan dengan metode: 1) sosialisasi; 2) pelatihan; dan 3) pendampingan. Hasil yang diperoleh dari pengabdian ini adalah: 1) peningkatan pengetahuan UMKM tentang pemanfaatan dana desa untuk usaha; 2) peningkatan pemahaman dan keterampilan dalam pengemasan yang baik.
The Processing of Industrial Tofu Dreg Waste into Animal Feed in Sumurrejo Village, Semarang Kusumaningtyas, Ratna Dewi; Hartanto, Dhoni; Prasetiawan, Haniif; Triwibowo, Bayu; Maksiola, Masni; Kusuma, Andre Dianata Hogi; Fidyawati, F; Mezaki, Naufal Mudrik; Mutaqin, Afrizal Mai; Loveyanto, Rendy Okta
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.27278

Abstract

Tofu is famous as a favorite, healthy, nutritious and cheap food in Indonesia. The tofu industry has been growing rapidly in this country in the form of household scale businesses or MSME (Micro, Small and Medium Enterprises). Among the tofu MSME centers in Semarang is the one in Sumurrejo Village, Gunungpati District. Sumurrejo village has various business potentials that are capable of driving the community’s economy, especially the entrepreneurship of tofu and tempeh MSMEs, as well as dairy and beef cattle farming. The MSMEs in this area are growing rapidly and able to improve the economy of the local community. In spite of this positive impact, the existence of tofu industry also has a negative effect since its waste causes environmental pollution problems. One of them is tofu dreg waste which can cause pollution to the environment due to its bad smell, organic matters content, and putrefaction potential. One effort to overcome this problem is to process the tofu dreg waste into animal feed. Tofu waste has high nutritions which consist of 8.66% protein, 3.79% fat, 51.63% water and 1.21% ash. Therefore, in order to resolve the environmental problems caused by the disposal of tofu waste and the problem of the high price of commercial animal feed, it is necessary to conduct community service activities to increase the added value of tofu waste by processing it into animal feed through fermentation process. Tofu pulp fodder produced in this activity was also tested on chickens. Chickens that were feed with tofu waste shown a better weight gain than those given regular fodder (pur). Training on tofu waste processing into fodder was very useful for the community within the area of the tofu industry in Sumurrejo Village because it could overcome the environmental problems caused by tofu dreg waste and could provide cheap, nutritious, safe animal feed and support the livestock growth. Community service activities were conducted by providing knowledge and skills through lecturing, practice and skills training, as well as monitoring activities.
PENERAPAN IPTEK PADA USAHA KECIL ROTI BAKAR Khumaedi, Muhammad; Eko, Budiarso; Rusiyanto, Rusiyanto
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 15, No 1 (2017): Juli 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v15i1.12570

Abstract

The target of this devotion is to make the enterprise of toast bread “Maju Terus Jaya” helps making the milling machine of toast bread dough that has quality. And for the “Ivan” toast bread enterprise is uploading the advertisement on the internet in order to be better known by the so- ciety surrounding Sampangan, Semarang and making the packaging of toast bread wrapper. Method to resolve the problem is using several ways that supporting one and the others and adapted with the steps that will be done. The steps of the method as follows: counseling, demonstrations, train- ing, making an advertisement and mentoring. The results of this activity to the enterprise of toast bread “MajuTerus Jaya” is the manufacture of a dough milling machine that produces qualified toast bread with the inside structure that more subtle, chewy, and soft. And for the enterprise of toast bread “Ivan” has been successfully created an advertisement that is uploaded on the internet and making the packaging of toast bread wrapper more attractive. The impact of the results of activity that done is the production of toast bread that is sold being able to increase so that the net profit of the enterprise of toast bread “Maju Terus Jaya” and the selling of toast bread “Ivan” increases
PROSES CETAK BRIKET BERBAHAN LIMBAH KOLANG-KALING DENGAN TEKNOLOGI TEPAT GUNA Supriyadi, Supriyadi; Masturi, Masturi; D.J., Pratiwi
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 13, No 2 (2015): Desember 2015
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v13i2.5608

Abstract

Has carried out activities to the community in the form of the development of the printing press in the village briquettes Jatireo Gunungpati Kodia subdistrict in Semarang. The background of this activity is to address the process of making briquettes at the time of printing, where the results obtained are not crowded so long the flame is not as expected. To overcome these problems have created a tool that is used to press briquettes load prior to release of the molding tool. The results showed no difference in the thickness of the pressed briquettes are pressed. The thickness of the briquettes without using the press is 1 cm and 0.5 cm using a press. In addition, test results obtained by burning briquettes burning rate of the skin and fro in the range of 0.03 to 0.04 g/s. This result is consistent with the type of biomass briquettes from other types such as wood, leaves, etc. with 0.03 combustion rate g/s. The color of the flame indicated when laboratory testing is reddish yellow and the smoke does not cause itching when on the skin.
PEMBUATAN BRIKET BERBAHAN LIMBAH KULIT KOLANG-KALING DI DESA JATIREJO GUNGPATI SEMARANG Supriyadi, Supriyadi; Masturi, Masturi; Mahardika, P.A.; Pratiwi, D.J.; Susilo, Susilo
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 12, No 1 (2014): Juli 2014
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v12i1.5584

Abstract

Community service activities have been carried out with the caption Accompaniment Leather Processing fro Being Gunungpati Jatirejo village Briquette in Semarang. Background This village was chosen for the reason that it has expanded economic activity that produces a variety of snack food products that is characteristic of this village. Program-related community service activities above, the Physics Department has undertaken preparatory activities carried out in the laboratories of Physics. In this preparatory activities have made a molding tool briquettes, briquette press equipment for compacting, testing and analysis of samples. The next activity is the implementation of the results on the field were done with lectures and practical approach. The results of the activities in the field generally indicates that the participants can make some sample briquettes. However, to further the process has not been analyzed, considering the current conditions do not allow the activity to heat up with the sun because of the rain.
PELATIHAN PEMANTAUAN PENCEMARAN BAGI MASYARAKAT DI BANTARAN DAS KALIGARANG 1,2 SEMARANG DENGAN METODE GEOLISTRIK Supriyadi, Supriyadi; Hardyanto, Wahyu; Budiyono, Aris; Djuniadi, Djuniadi
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 14, No 1 (2016): Juli 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v14i1.7862

Abstract

The background of this activity has occurred is water pollution in Kaligarang river. Therefore it is necessary efforts to protect the environment along the it. Exercising their activities consist of (1) Preparation, (2) Implementation, and (3) evaluation of the participants are young people in rural districts offense Sukorejo Gunungpati Semarang who live along the Kaligarang river who pass through the village. The event begins with a lecture about the pollution of the river and continued geoelectricity measurements at points predetermined. Geoelectricity measurement results obtained in the field of electric current and potential difference at the point of measurement points. Results showed that the participants in the activity have improved understanding of the geoelectric. It is characterized by the seriousness of the activity when participants perform geoelectric measurements, process data directly in the field. Based on the map sectional resistivity soil layer of field measurement data concluded that there has been a seepage of river water in the area Kaligarang community service activities but seepage is not cause contamination in the soil.
PENINGKATAN KOMPETENSI GURU DALAM SPEAKING ENGLISH FOR INSTRUCTIONAL PURPOSES UNTUK PENGAJARAN BILINGUAL DI SD ISLAM AL AZHAR 29 BSB SEMARANG Fitriati, Sri Wuli; Farida, Alief Noor
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 16, No 2 (2018): Desember 2018
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v16i2.17515

Abstract

Memperkuat Sejak tahun 2016, SD Islam Al Azhar 29 BSB Semarang merintis pengajaran bilingual (yaitu, pengajaran dalam dua bahasa, Bahasa Indonesia dan Bahasa Inggris) untuk mata pelajaran Matematika dan IPA. Tantangan utama program ini adalah kompetensi guru dalam berbahasa Inggris. Oleh karena itu, dibutuhkan pelatihan peningkatan kemampuan guru berbahasa Inggris, khususnya Speaking English for Instructional Purposes. Pelatihan yang bertujuan untuk mempersiapkan penyelenggaraan kelas bilingual ini dilaksanakan dalam lima kali pertemuan. Setiap pertemuan berlangsung selama 2 – 2,5 jam. Teknik kegiatan meliputi: pronunciation drills, group and class discussions, modelling, penyusunan skenario pengajaran (teaching scenario), dan microteaching. Peserta selalu antusias dalam setiap kegiatan. Setiap sesi microteaching berakhir, dilakukan refleksi. Feedback dari peserta lain terhadap guru yang melakukan microteaching sangat supportif dan konstruktif. Pada akhir pelatihan, terdapat peningkatan kompetensi guru-guru peserta pelatihan dalam menggunakan ungkapan-ungkapan bahasa Inggris untuk tujuan pengajaran. Mereka tampak lebih percaya diri dan lebih lancar berkomunikasi dalam bahasa Inggris. Pihak sekolah mengharapkan pelatihan berkelanjutan untuk menyukseskan program pengajaran bilingual di sekolah.  
MENINGKATKAN KOMPETENSI PEDAGOGIK GURU-GURU SEJARAH SMA DI KOTA SEMARANG DALAM KEMAMPUAN PEMANFAATAN MEDIA MELALUI PELATIHAN APLIKASI TEKNOLOGI GOOGLE EARTH DALAM PEMBELAJARAN SEJARAH Suryadi, Andy; Bain, Bain
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 11, No 2 (2013): Desember 2013
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v11i2.10314

Abstract

Sejarah merupakan ilmu yang mempelajari proses perubahan dan keberlanjutan dalam dimensi ruang dan waktu, maka pengajaran sejarah perlu dilaksanakan untuk membangun pemahaman keilmuan berprespektif ruang dan waktu. Akan tetapi dalam pembelajaran sejarah selama ini, siswa yang mengikuti seringkali mengalami berbagai kesulitan terkait dengan pemahaman perspektif ruang dalam konteks sejarah. Oleh karena itu secara teoritis keberadaan media mutlak diperlukan untuk membantu mengatasi problem tersebut. Salah satu program yang dapat dimanfaatkan dalam mempelajari sejarah adalah dengan pemanfaatan program Google Earth. Tujuan kegiatan pengabdian dengan judul Meningkatkan Kompetensi Pedagogik Guru-Guru Sejarah SMA di Semarang dalam Kemampuan Pemanfaatan Media Melalui Pelatihan Aplikasi Teknologi Google Earth dalam Pembelajaran Sejarah, adalah: 1). Terciptanya proses belajar mengajar sejarah yang menyenangkan bagi peserta didik sesuai dengan perkembangan dan kematangan jiwanya. 2). Memberi motivasi kepada guru-guru sejarah SMA di Semarang akan pentingnya meningkatkan kompetensi Pedagogik terutama dalam hal pemanfaatan media terutama aplikasi teknologi Google Earth. 3). Meningkatnya kompetensi dan kreatifitas guru untuk menggunakan media berbasis internet dalam pembelajaran sejarah sesuai dengan karakter dan situasi lingkungan silabus yang telah disusun. 4) Meningkatnya pemahaman spasial peserta didik sehingga prestasi belajar semakin baik yang dapat meningkatkan mutu pendidikan.
IBM KELOMPOK USAHA SOUVENIR SABLON DIGITAL Krisnawati, Maria; Prasetyaningtyas, Wulansari; Mujiyono, Mujiyono
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 13, No 1 (2015): Juli 2015
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v13i1.5593

Abstract

Targets to be achieved through IbM is on aspects of production and management. Aspects of the production which increased the production technology of making souvenirs, increasing capacity in the field of design through the program Corel Draw and Adobe Photoshop as well as consolidation of production procedures with due regard to health and safety work management. Management aspects namely on financial management, financial management hold good with regular bookkeeping, through marketing management produces forms of promotion through various media. Market network expansion and facilitate consumer access to order products.Through HR management can improve the training of human resources, the provision of entrepreneurial motivation and self empowerment. IbM implemented through phases 1 ) Preparation ; 2 ) Stage Assessment ; 3 ) The Plan or Program Activity; 4 ) Phase Action Plan ; 5 ) Implementation Phase or activity ; and 6 ) Evaluation Phase . It is expected to be implemented through the stages can help solve problems and realize the needs of partners.

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