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All Journal Jurnal Teknik Kimia USU Agrointek Religio : Jurnal Studi Agama-agama JOURNAL OF EARTH ENERGY ENGINEERING Jurnal Hasil Penelitian Industri Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Gema Kampus IISIP YAPIS Biak Perspektif Komunikasi; Jurnal Ilmu Komunikasi dan Komunikasi Bisnis Jurnal Teknik Kimia USU
Rosdanelli Hasibuan
Department Of Chemical Engineering, Faculty Of Engineering, Universitas Sumatera Utara, Jl. Almamater, Padang Bulan, Medan 20155, Indonesia
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Social Sciences

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KARAKTERISTIK BRIKET DARI SEKAM PADI DAN KETAMAN KAYU BERPEREKAT DAUN JAMBU METE Widya Gema Bestari, Mutiara Mendopa, Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol 5, No 2 (2016)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (323.42 KB) | DOI: 10.32734/jutek.v5i2.11639

Abstract

Briquettes are biomass compaction technology as alternative energy sources with or without binder in different shape and size. The research is aimed to analyze the best carbonization process, compaction pressure and binder concentration for quality of briquettes. In this resarch, rice husk and wood shaving are used as raw materials  carbonized at different process, named by carbonization process 1 and other carbonization process 2. Carbonization process 1 was done by carbonized each raw material and then mixed while carbonization process 2 was done by mixed raw materials then carbonized. Raw materials were blended with cashew nut leaves binder at concentration 10%, 12,5%, 15%, and 20% and then compacted at pressure 85 kg/cm2 and 105 kg/cm2. The best briquette was briquette that rice husk and wood shaving were carbonized by carbonization process 1 blended with 15% binder and compacted at 85 kg/cm2 and had calorific value 2045,8271 cal/g.  
PEMANFAATAN FLAVONOID EKSTRAK DAUN KATUK (Sauropus androgynus (L) Merr) SEBAGAI ANTIOKSIDAN PADA MINYAK KELAPA Indah Cikita, Ika Herawati Hasibuan, Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol 5, No 1 (2016)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (250.833 KB) | DOI: 10.32734/jutek.v5i1.11770

Abstract

In this research, the katuk leaves (Sauropus androgynus (L) Merr) extracted for get flavonoid which used as antioxidant for the coconut oil. This research aims to determine the effect of the extraction time, the volume of the solvent, and the type of solvent for the yield and total flavonoid concentration of the katuk leaves extract and then to determine the effect of total flavonoid concentration and contact time the flavonoid of katuk leaves extract as antioxidants in coconut oil. The process used is extraction of katuk leaves used the solvent such as ethanol, n-heksana and etil asetat then extract will be analysed the yield and total flavonoid concentration of the katuk leaves extract. Then extract with the  total flavonoid concentration 6,668%, 7,748% and 27,909% was used as a sample and contacted in the coconut oil with the contact time of  2, 4 and 6 days. Then, analysis is done of the coconut oil is the acid number, the iodine number and the peroxide number. The result obtained in this research is the best extraction time of 6 hours with solvent volume of 1250 ml with the best type of solvent is ethanol, the yield of extract is 0,243% and total flavonoid concentration is 27,909%. The total flavonoid concentration increasing cause a decrease the acid number, the iodine number increase and decrease the peroxide number which proved that katuk leaves extract can be used as antioxidants in the coconut oil with the best result is the total flavonoid concentration in 27,909% where the acid number is 0,962 mg KOH/g, the iodine number is 38,705 g I2/100 g and the peroxide number is 13,333 Meq/kg. The contact time of flavonoid in the coconut oil which increasing cause oil properties is getting worse but the results are better than the oil without the addition of extract.
PEMBUATAN BRIKET DARI KULIT KAKAO MENGGUNAKAN PEREKAT KULIT UBI KAYU Rosta Natalia Sinaga, Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol 6, No 3 (2017)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (361.815 KB) | DOI: 10.32734/jutek.v6i3.18663

Abstract

This study aims to determine the effect of temperature variation carbonization, carbonization time and adhesive variation to charcoal characteristics of cocoa skin using cassava skin adhesive. Briquette is usually made using binder. Binder can embed charcoal each other to form strong and compact briquettes. Some other variables beside binder that influence the quality of briquettes include raw material, compacting presseure and carbonization process. This research used cocoa leather as raw material with cassava skin leaves as binder. All variables affect the content of fixed carbon of the briquettes that influence the caloricvalue of the briquettes. The caloricvalue is the most important factor for determining the quality of the briquettes. In this research, the highest caloricvalue of the briquettes was 4.375 cal/g. It was achieved when cocoa leather were carbonized by method 1 with compaction pressure of 85 kg/cm2 and binderconcentration of 15% where as raw material with  particle size of 100 mesh. The caloricvalue of the  briquettes was still very low and did not meet the qualification of Indonesian standard for briquettes. Based on the strength test, cassava skin leaves couldn’t be used as briquette’s binder. The produced briquettes that used cassava skin leaves as binder had soft structure and easily destroyed.
EFEKTIFITAS JENIS DESIKAN DAN KECEPATAN UDARA TERHADAP PENYERAPAN UAP AIR DI UDARA Rosdanelli Hasibuan, Ivo Dian Sari Marbun
Jurnal Teknik Kimia USU Vol 7, No 1 (2018)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (648.667 KB) | DOI: 10.32734/jutek.v7i1.21001

Abstract

Dry air is widely used in many fields, but the excessive water vapor in the air will make some problem and should be minimized to get the required dry air. The purpose of this research to observe the effect of air velocity and various of desiccants on the absorption of water vapor in the air on the tray dryer. The process of absorption of water vapor  in the air performed with variations of the normal air velocity, 1.2 m/s, 2.3 m/s, and 3.6 m/s or volumetric rate of 0.059 m3/s; 0.113 m3/s; 0.178 m3/s and the type of desiccant of silica gel, alumina, and zeolite. Adsorption of water vapor in the air by desiccant was done by weighing the mass of desiccant before and after being crossed by air every interval of 60 minutes for 3 hours. Humidity measurement are performed on the upstream and downstream of the tray dryer to obtain a decrease in air humidity. The highest moisture adsorption using silica gel was obtained at velocities of 2.3 m/s and 3.6 m/s with adsorption of 0.266 grams water vapor / grams adsorbent and 0.264 grams water vapor / grams adsorbent as well as humidity of final air of 0.0194 kg water vapor/ kg dry air and 0.0198 kg water vapor/ kg dry air . The highest adsorption of water vapor using alumina was obtained at velocities of 2.3 m/s and 3.6 m/s with adsorption of 0.147 grams water vapor / gram adsorbent and 0.140 grams water vapor / gram adsorbent and the final humidity of 0.0207 kg water vapor / kg dry air and 0.0194 kg water vapor / kg dry air and the highest water vapor adsorption using zeolite was obtained at 3.6 m/s with the adsorption capacity of 0.130 grams water vapor / grams adsorbent and the final humidity of 0.0193 kg water vapor / kg dry air. Silica gel was the best desiccant in the process of moisture adsorption in air compared to alumina and zeolite.
PENGARUH SUHU REAKSI, KECEPATAN PENGADUKAN DAN WAKTU REAKSI PADA PEMBUATAN SABUN PADAT DARI MINYAK KELAPA (Cocos nucifera L.) Rosdanelli Hasibuan, Fransiska Adventi, Rahmad Parsaulian Rtg
Jurnal Teknik Kimia USU Vol 8, No 1 (2019)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.663 KB) | DOI: 10.32734/jutek.v8i1.23730

Abstract

Soap is a cleanser made by chemical reactions between sodium hydroxide or potassium hydroxide with fatty acids from vegetable oils or animal fats. Soaps can be made by several methods, namely saponification and neutralization methods, in this study carried out by saponification method. In the saponification method there are several problems namely operating conditions which include reaction temperature, stirring speed and stirring time. Therefore, need to do research to determine the best conditions of saponification reaction, namely reaction speed, operating temperature and reaction time using an impeller type multiple pitch blade turbine with research variables reaction temperature 60 oC, 70 oC, and 80 oC, stirring speed 300 rpm,400 rpm and 500 rpm and reaction time of 45minutes, 60 minutes, and 75 minutes. Saponification reaction is carried out by heating coconut oil and inserting 30% NaOH slowly and then stirring with a multiple pitch blade stirrer. The product will be analyzed by testing alkaline levels, moisture content and pH of the soap. The best operating conditions obtained from this study were at a temperature of 70 oC, reaction time of 60 minutes, stirring speed of 400 rpm with a pH value of 9.4 and an alkaline level of 0.073 and a moisture content of 9.8.
PERSEPSI MASYARAKAT TERHADAP HUBUNGAN DI LUAR NIKAH DI KAMPUNG INGGIRI DISTRIK BIAK KOTA KABUPATEN BIAK NUMFOR Hasriati Hasriati; Sukriadi Sukriadi
Gema Kampus IISIP YAPIS Biak Vol 15 No 2 (2020): "Gema Kampus" IISIP YAPIS Biak
Publisher : IISIP YAPIS BIak

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52049/gemakampus.v15i2.116

Abstract

Abstrak Penelitian bertujuan untuk mengetahui: 1) Untuk mengetahui persepsi masyarakat terhadap hubungan di luar nikah di kampung Inggiri Distrik Biak Kota Kabupaten Biak Numfor , 2) Untuk mengetahui norma pengatur dan hukum Negara menyelesaikan agar tidak ada masyarakat melakukannya. Jenis penelitian yang di gunakan penulis adalah jenis asiosiatif. Penelitian asiosiatif yaitu merupakan penelitian yang bertujuan untuk mengetahui hubungan antara dua variabel atau lebih. Data dari penelitian ini dikumpulkan melalui observasi, interview dan studi kepustakaan, kemudian dianalisis dengan menggunakan model interaktif Miles dan Huberman, yakni model yang terdiri dari tiga proses yang berlangsung secara intraktif. Pertama, reduksi data yang merupakan proses memilih, memfokuskan, menyederhanakan dan mengabstraksikan data dari berbagai sumber, misalnya dari dokumen, catatan lapangan dan sebagainya.Hasil penelitian ini menunjukan bahwa Salah satu faktor terjadinya hubungan di luar nikah karena beratnya mas kawin yang di lemparkan kepada pihak laki-laki. Jadi mereka dapat mengambil sebuah kesimpulan bahwa menikah secara sah itu sangat meberatkan jadi yah sudah kita kawin dulu baru nanti menikah secara sah. Hubungan di luar nikah di lakukan dengan terpaksa karena di barengi dengan cinta kedua belah pihak (laki-laki dan perempuan), sehingga mereka melakukannya karena persiapan mas kawin belum tersedia untuk melamar seorang wanita pujaannya. Maka, pelanggaran ini mereka langgar karena tidak jalan lain, agar mereka bersatu (kawin) tanpa adanya hambatan, maka mereka memilih jalan pintas untuk berhubungan di luar nikah, sebagaimana layaknya orang yang menikah dengan mengikuti aturan Pemerintah dan Norma Agama.
ANALISIS PEMBERITAAN JOKO WIDODO DI TELEVISI (ANALISIS WACANA KRITIS DI PROGRAM REPORTASE SORE TRANS TV Muhammad Ikhwan
Perspektif Komunikasi: Jurnal Ilmu Komunikasi Politik dan Komunikasi Bisnis Vol 3, No 1 (2019): Perspektif Komunikasi
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.972 KB) | DOI: 10.24853/pk.3.1.8-22

Abstract

Gaya  kepemimpinan  dan  penampilannya  yang  berbeda  dengan  pejabat  kebanyakan,  membuat  figur  Jokowi menjadi fenomenal. Penelitian ini ingin memotret bagaimana Trans TV, melalui Program berita Reportase Sore, mengkonstruksi  figur  Jokowi  sebagai  Gubernur  DKI  Jakarta  ke  dalam  pemberitaannya.  Penelitian  dilakukan dengan  menggunakan  Analisis  Wacana  kritis  dengan  pendekatan  Norman  Fairclough.  Ada  tiga  hal  yang dianalisis,  yakni  teks  berita,  analisis  produksi  berita  di  news  room  dan  juga  analisis  sosial  budaya.  Diperiode pertama  penelitian,  terlihat  pemberitaan  didominasi  oleh  sentimen  positif  untuk  Jokowi.  semua  aktivitas  dan kebijakan  Jokowi  diberitakan,  sehingga  Reportase  Sore  seakan  menjadi  humas  Jokowi.  Sebaliknya,  diperiode kedua, redaksi mulai bersikap kritis terhadap Jokowi. Tingginya intensitas pemberitaan Jokowi tidak terlepas dari kepentingan  ideologi,  dan  sistem  kerja  diruang  redaksi,  dimana  angle  dan  kebijakan  redaksi  didominasi  dari perspektif Produser dan jajaran lainnya. Sementara dari aspek sosial budaya, masifnya pemberitaan Jokowi terkait dengan sistem penyiaran Indonesia yang cenderung mengarah pada mekanisme pasar (kapitalisme).  Kata kunci: Analisis Wacana Kritis, Berita Televisi, Joko Widodo.
Pengaruh Ketebalan Bahan Dan Jumlah Desikan Terhadap Laju Pengeringan Jahe (Zingiber Officinale Roscoe) Pada Pengering Kombinasi Surya dan Desikan Hasibuan, Rosdanelli; Alfikri Ridhatullah, Muhammad
Jurnal Teknik Kimia USU Vol. 8 No. 2 (2019): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v8i2.1882

Abstract

Ginger is a spice plant that is usually used as a seasoning in cooking or raw material for medicine, traditional or industrial medicine. Ginger has a high-water content so its easily contaminated with microbes and has active ingredients (gingerol) which are easily damaged by high temperatures. Ginger drying is intended for maintaining the quality of dry ginger and keep ginger from microbes. The drying process has done in continuously with solar dryer using flat plate type collector during the day and at night using the Molecular Sieve 13x desiccant. Drying varies the thickness of ginger 2 mm, 4 mm, and 6 mm, and the amount ratio of desiccant: 1:1; 1:2; and 1:3. To get drying characteristics, every 1-hour mass calculated using an electric scale, and data logger every 5 minutes calculates the temperature and humidity rate (RH) in the drying chamber. The result from ginger drying is the thickness of 6 mm needed more than 20 hours of drying process so that it needed the combination of dryer compared to other thickness, and from quality analysis results of dry ginger, ash content parameters already accordance with SNI standards, and 1:1 material and desiccant ratio is the variation that most closely matches the SNI standard.
Pemanfaatan Tandan Pisang Kepok sebagai Sumber Alkali pada Pembuatan Sabun Cair Amelia, Reny Elvira; Hasibuan, Rosdanelli; Irvan
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.5383

Abstract

Kepok banana bunches were used as a source of natural alkali in the study of determining the ratio of coconut oil and palm oil in the saponification process using banana bunch ash. Alkali is obtained from the calcination process with variations in temperature of 400 °C, 500 °C, 600 °C, and 700 °C for 4 hours. Characterization of potassium from Kepok banana bunch ash using Atomic Absorption Spectrophotometer resulted in the highest potassium being 58.41% at 600 °C. The potassium obtained is used as a source of alkali in the saponification process of liquid bath soap. In this study, variations in the amount of alkali (30%, 40%, 50%, and 60%), the ratio of coconut oil and palm oil (60:40, 70:30, 80:20, and 90:10 (w/w)) with reaction times were carried out 2.5 hours, 3 hours, and 3.5 hours. The best liquid bath soap was obtained at a ratio of 70:30 (w/w) coconut oil and palm oil and 30% alkali with a reaction time of 2.5 hours which was 81.34%.
Pengaruh Suhu dan Waktu Pirolisis terhadap Karakteristik Arang dari Tempurung Kelapa Hasibuan, Rosdanelli; Pardede, Hans Martua
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.8534

Abstract

The increased production of coconut has increased by the shell produced, even though this coconut shell has lignin content of 33.30% so it has the potential to be converted into charcoal through the pyrolysis process. Pyrolysis is a thermal decomposition process that occurs without air or with little air to convert biomass into charcoal. Coconut shell charcoal can be used for coal co-firing in developing new and renewable energy. This study aimed to obtain the best pyrolysis temperature and time in the manufacture of high-calorific value coconut shell charcoal in accordance with SNI 06-4369-1996. Coconut shell pyrolysis was carried out at temperatures of 350 °C, 450 °C and 550 °C and pyrolysis times of 2 hours, 3 hours and 4 hours. The results showed that charcoal with the highest calorific value was produced at a temperature of 450 °C and a pyrolysis time of 3 hours. The resulting charcoal had calorific value of 7,750.96 cal/g, yield of 30.10%, and contained 2.75% water, 2.70% ash and 9.50% volatile matter.
Co-Authors Adventi, Fransiska Alfikri Ridhatullah, Muhammad Amelia, Reny Elvira Chalidah Pratiwi Siregar Dian Novita Elisabeth Gultom Fiki Hidayat Hamdanah Hasibuan Hartina Sylvia, Hartina Iriany Irvan Juliza Hidayati Muhamamd Turmuzi, Muhamamd Muhammad Khairul Afdhol Muhammad Yudatama Hasibuan Pardede, Hans Martua Parsaulian R, Rahmad Renita Manurung Rini Anggraini Risma Fazillah Rita Sundari Sukriadi Sukriadi Tomi Erfando Ummah, Nisa’a Mufidatul Vikram Alexander Vikram Alexander Viqry Pramananda Yovani Nissi Madani