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All Journal METANA Seminar Nasional Teknik Kimia Kejuangan INTEK: Jurnal Penelitian JATI (Jurnal Mahasiswa Teknik Informatika) JURNAL ILMIAH AGRINECA Civil Engineering and Technology Journal IJCR (Indonesian Journal of Chemical Research) Folia Medica Indonesiana
HARJANTO HARJANTO
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Environmental Science Health Professions Materials Science & Nanotechnology Medicine & Pharmacology Neuroscience Transportation

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Distribusi Konsentrasi COD dan TSS pada Pengolahan Limbah Tahu dengan menggunakan Reaktor Alir Pipa Sitti Sahreni; Harjanto Harjanto; Mustafa Mustafa; Musdalifah Musdalifah; Firman Firman
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Liquid waste in tofu industry has the COD and TSS values that exceed the environmental quality standards.The high value of COD and TSS liquid waste in tofu industry is caused by the high organic level.The organic content from tofu industry can be lowered by a fermentation process using a reactor.This study is conducted to investigate the effect of the reactor’s length to the decreasing level of COD and TSS liquid waste of tofu industry with fermentation method using cow intestines as starter.This research was conducted by varying the sampling length of the reactor’s flow pipe from 20 cm, 40 cm, 60 cm, and 80 cm.The process was done within 45 days and a loading rate of 0.8 L/5 days.Based on the results of the research, time and sampling length affect the % of the decreasing level of COD and TSS.The fermentation process using flow pipe reactor enables the COD to get lower, up to 98.57% with the COD value of 196 mg/L at 80 cm sampling length on day 45, while the TSS can be lowered up to 77.38% with TSS value of 38 mg/L at 80 cm sampling length on day 45. The values of COD and TSS have met the environmental quality standards based on the number 02 of2011 East Kalimantan provincial.
UJI DOSIS PUPUK P DAN K TERHADAP PERTUMBUHAN DAN HASIL TANAMAN KEDELAI (Glycine max L. Merril) David Do Rosario Marques; HARJANTO HARJANTO; TEGUH SUPRIYADI
JURNAL ILMIAH AGRINECA Vol. 11 No. 2 (2011): jurnal AGRINEÇA
Publisher : Fakultas Pertanian, Universitas Tunas Pembangunan Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36728/afp.v11i2.147

Abstract

The study aims to determine the effect of the dosage range of P and K fertilizers on the growth yield of soybean (Glycine max L. Merril) study was conducted in the Green house the Faculty of Agriculture, University of Surakarta Tunas Development The method used is the factorial method with the basic pattern of Randomized Complete Block Design (Block), consisting of two treatment factors, 1) type of dosage P (SP-36) consists of P1 = 25 kg SP-36/ha, P2 = 50 kg SP-36/ha, and P3 = 75 kg SP-36/ha, 2) types of K fertilizer (KCl) is comprised of K1 = 25 kg KCl / ha, K2 = 50 kg KCl / ha, and K3 = 75 kg of KCl / ha, with three times as many replications. The results showed (1) Treatment kinds of fertilizer P (SP-36) showed highly significant at fresh weight of crown, dry weight of crown, pod number per plant, number of empty pods per plant and dry seed weight per plant, but did not affect significantly in plant height. (2) types of K fertilizer treatments (KCl) showed highly significant effect on fresh weight of crown, dry weight of crown, pod number per plant, number of empty pods per plant and dry seed weight per plant, significant effect on plant height, but influential not evident in the number of empty per plant. (3) Interactions between the treatment of types of P fertilizer (SP-36) and K (KCl) have no significant on all parameters. (4) of dry seed weight per plant combined treatment with the highest dose of SP-36 amounted to 75 kg / ha with a dose of KCl at 75 kg / ha (P3K3), was 25,2 g per plant (6,3 ton/ha), and lowest in the combined treatment doses of SP-36 for 25 kg / ha KCl dose of 25 kg / ha (P1K1), was 21,0 g per plant (5,3  ton/ha)
PENGARUH DOSIS DAN FREKUENSI PEMBERIAN PUPUK UREA TERHADAP PERTUMBUHAN DAN HASIL PETSAI DI BAWAH TEGAKAN SENGON UMUR 1,5 TAHUN ROCHMADI ROCHMADI; HARJANTO HARJANTO; HARYUNI HARYUNI
JURNAL ILMIAH AGRINECA Vol. 6 No. 2 (2006): Jurnal Agrineḉa
Publisher : Fakultas Pertanian, Universitas Tunas Pembangunan Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36728/afp.v6i2.225

Abstract

This Research porpose to know the effect of dose and gift frekuensi fertilize the urea and also interaction of both to growth and result of crop petsai (Brassica Pekinensis L) at strightened of sengon ( Paraserianthes Fakataria). Research have been executed at date of 28 March 2006 to 30 May 2006, in Countryside Tumenggungan, Subdistrict of Selomerto of Regency Wonosobo, Province of Central Java with the place height 850 m is above sea level. Research use the factorial method of elementary pattern of RAKL (Random Device of Complete Group) with two treatment factor that is 1) Dose fertilize the urea ( D) consisted of by 3 level : D1 50 kg / ha, D2 = 75 kg / ha, D3 = 100 kg / ha 2) Gift frekuensi fertilize the urea (F) consisted of by 3 level : F1 momentary before planting, F2 = frekuensi plant and after crop old age the two week, F3 = momentary before planting, after crop old age two and four weeks. Result of research show the 1) Dose treatment fertilize the urea have cm effect on very real at high of crop, sum up the leaf plant, fresh heavy of dry brangkasan plant weight and consume the plant 2) treatment of gift frekuensi fertilize to have an effect on very real to fresh weight of crop ready to consumption, heavy run dry the crop ready to consume, but do not have an effect on the reality differ is not real at high of crop, sum up the leaf plant. fresh heavy of brangkasan plant, and dry weight of brangkcisan plant 3) Interaction usher the treatment of dose and its gift frekuensi have an effect on the reality of at high of thy weight and crop of brangkasan plant of but having an effect on is not real to amount of leaf plant, fresh heavy of .fresh brangkasan plant weight and consume the plant 4) fresh Heavy of highest consumption 297,90 g /plant, obtained at combination of D3 F3 ( dose urea 100 kg / ha given momentary before planting, after crop old age two and four weeks). fresh Heavy consume the minimal 94,16 g/ plant obtained at combination of plant D1 F2 ( dose urea 50 kg / ha with the moment gift plant and after crop old age two week).
STUDI IDENTIFIKASI DAN DESAIN SABO DAM OP-RRC3A DI SUNGAI OPAK KABUPATEN SLEMAN Nurokhman, Nurokhman; Kristiyanto, Hery; Budiyanto, Muchamad Arif; Harjanto, Harjanto
Civil Engineering and Technology Journal Vol. 6 No. 1 (2024): CivETech
Publisher : Fakultas Teknik Universitas Cokroaminoto Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47200/civetech.v6i1.2249

Abstract

Erupsi Gunung Merapi yang memiliki periode letusan tiap 3 – 7 tahun akan menyebabkan hamparan material lava letusan pada bagian hulu Sungai dan pada saat hujan dengan intensitas tinggi mengakibatkan timbunan material lava yang mengalir menjadi aliran debris. Beberapa kejadian aliran debris menjadi bencana yang merusak inftrastruktur bahkan hingga timbul korban manusia. Sabo dam merupakan salah satu konstruksi untuk pengendalian aliran Sungai sekaligus pencegahan bencana aliran sediman. Salah satu Dam Sabo Sungai Opak adalah sabo dam OP-RRC3a di Kabupaten Sleman menuju Candi Prambanan. Dalam perencanaan telah dilakukan identifikasi kondisi eksisting lokasi, penetapan lokasi, desain konsep, perancangan dimensi dan tinjauan terhadap stabilitas bangunan. Tujuan studi ini adalah untuk mengetahui identifikasi parameter desain bangunan sabo dam dan evaluasi opsi konsep desain bangunan sabo. Hasil identifikasi Sungai Opak pada lokasi OP-RRC3a memiliki panjang sungai 10,12 km dengan aliran Sungai Opak pada lokasi OP-RRC3a berasal dari Daerah Aliran Sungai (DAS) Opak yang memliki luas kurang lebih 6,74 km2, elevasi sungai bagian hulu sebesar 1149,850 mdpl dan bagian hilir sebesar 465,20 mdpl serta memiliki kemiringan dasar sungai 0,068. Kondisi tata guna lahan sebagian besar masih berfungsi sebagai perkebunan dan ladang dengan dasar sungai berbatu dan lebar sungai sempit serta badan sungai masih ditutupi rerumputan. Hasil pengujian daya dukung tanah menurut Meyerhorf (1976) qa = 136,67 T/m2 dan menurut modifikasi Meyerhorf (1976 dan 1974) qa = 144,42 T/m2. Konsep desain sistem sabo dam pada OP-RRC3a dengan luas tangkapan 6,70 km2, kemiringan 8,74%, tinggi 7 m, overflow 15 m dengan tipe konsolidasi dan tambahan fungsi untuk peningkatan intake irigasi Desa Wukirsari di sebelah kanan seluas 25 Ha dan di sebelah kiri Desa Argorejo seluas 15 Ha.
PERANCANGAN DAN SIMULASI JARINGAN KOMPUTER DENGAN METODE PENGEMBANGAN NETWORK DEVELOPMENT LIFE CYCLE (NDLC) PADA KANTOR CABANG PT. V2 INDONESIA Harjanto, Harjanto; Purnama, Giri
JATI (Jurnal Mahasiswa Teknik Informatika) Vol. 8 No. 4 (2024): JATI Vol. 8 No. 4
Publisher : Institut Teknologi Nasional Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jati.v8i4.10622

Abstract

PT. V2 Indonesia adalah perusahaan penyedia teknologi audio visual yang sudah terkenal di Indonesia. Kantor cabang PT. V2 Indonesia sedang menghadapi masalah dengan jaringan komputer yang ada sekarang. Infrastruktur jaringan di kantor tersebut masih belum tertata dan dikelola dengan baik, seperti kabel jaringan yang belum terhubung dengan benar antara perangkat seperti switch, router, dan PC. Keadaan ini menimbulkan permasalahan yang dapat menyebabkan jaringan komputer menjadi lambat dan tidak stabil saat dipakai untuk keperluan pekerjaan. Untuk mengatasi permasalahan tersebut dibutuhkan pengembangan perancangan jaringan komputer yang lebih baik dari rancangan jaringan sebelumnya, dengan metode pengembangan NDLC (Network Development Life Cycle) dan konsep VLAN (Virtual Local Area Network) yang dapat dibagi menjadi beberapa segmentasi berbeda diharapkan menjadikan infrastruktur jaringan yang lebih tertata dan mudah dikelola. Untuk menguji simulasi perancangan jaringan yang baru disini peneliti menggunakan software Cisco packet tracer. Hasil dari perancangan jaringan dengan menggunakan metode pengembangan NDLC dan konsep VLAN serta dengan simulasi Cisco Packet Tracer ini menjadikan jaringan yang tertata dengan baik dan mudah dikelola. Dengan adanya segmentasi VLAN kita dapat memaksimalkan kebutuhan jaringan sesuai dengan kebutuhan serta dapat memisahkan menjadi beberapa kelompok jaringan antara jaringan yang bisa terhubung dan yang tidak bisa terhubung dengan membedakan VLAN yang diinginkan.
Purification of Used Engine Oil by Pyrolysis– Adsorption Method Assisted Coal Activated Carbon Alwathan, Alwathan; Mohd-Setapar, Siti Hamidah; Irwan, Muh.; Thahir, Ramli; Harjanto, Harjanto; Wahyudi, Wahyudi; Sirajuddin, Sirajuddin; Samosir, Damianus; Okko, Sarifudin; Ayu, Sekar; Toyo, Rahmat Budi; Fadilah, Muhammad Reza
INTEK: Jurnal Penelitian Vol 11 No 1 (2024): April 2024
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v11i1.4685

Abstract

The increase in the use of engine vehicles every year is directly proportional to the amount of engine oil waste produced. Used engine oil is a class of hazardous waste that is harmful to the environment. This study aims to purify the base fuel from pyrolysis of waste engine oil by comparing integrated and non-integrated pyrolysis adsorption purification methods using activated low-rank coal as an adsorbent medium. The method used in this study is Pyrolysis using activated carbon from low-rank coal that has been carbonized with a temperature of 600 ° C and activated using H3PO4-NaHCO3. Pyrolysis is carried out by adding activated carbon with a ratio of 10% (w / w) of 11 grams from the volume of base fuel samples and Pyrolysis temperature of 350°C, then carried out by a variety of methods, namely the adsorption method followed by Pyrolysis, Pyrolysis followed by adsorption, and Pyrolysis adsorption integration. From this study, the optimum value of purification was obtained in the variation of integration adsorption pyrolysis with a density of 0.7631gr / ml and a specific gravity value of 0.7639 and an API degree of 53.7318, while for viscosity value of 0.5542 cP. The results of the product analysis have entered the standard specification value of gasoline or gasoline.
Optimalisasi Waktu Reaksi dan Konsentrasi Katalis Fly Ash dalam Produksi Biodiesel dari Minyak Jelantah Oko, Syarifuddin; Kurniawan, Diva Oita; Harjanto, Harjanto; Wahyudi, Wahyudi
METANA Vol 21, No 1 (2025): Juni 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/metana.v21i1.62467

Abstract

Biodiesel merupakan bahan bakar terbarukan yang dapat dihasilkan dari minyak nabati dan lemak hewani. Salah satu bahan baku yang dapat digunakan dalam pembuatan biodiesel  adalah  minyak  jelantah.  Minyak jelantah merupakan limbah apabila dibiarkan akan menyebabkan pencemaran terhadap lingkungan. Minyak jelantah memiliki potensi untuk dijadikan biodiesel karena mengandung trigliserida dan asam lemak melalui proses tranesterifikasi menggunakan katalis. Fly  Ash  batubara  dapat digunakan  sebagai  katalis  karena  memiliki kandungan komponen logam dan alkali yang terdiri dari SiO₂, Al₂O₃, dan Fe₂O₃ di impregnasi  dengan NaOH. Penelitian ini dilakukan untuk mengetahui pengaruh waktu reaksi transesterifikasi dan konsentrasi katalis terhadap rendemen biodiesel. Katalis dibuat dengan mengkalsinasikan fly ash pada  suhu 540˚C selama 1 jam, kemudian diimpregnasi dengan NaOH dan dikalsinasikan pada suhu 750˚C  selama 1 jam. Proses transesterifikasi dilakukan dengan cara mereaksikan minyak jelantah dan metanol dengan rasio 1:9 dengan waktu reaksi (1, 2, dan 3 jam) dan konsentrasi katalis (3, 4, dan 5%) dari 100g minyak jelantah. Hasil penelitian menunjukkan bahwa waktu reaksi optimum terdapat pada waktu 1 jam dengan konsentrasi katalis 5% menghasilkan rendemen sebanyak 68,17%, densitas 0,85g/ml, viskositas  kinematic 3,58 cSt, kadar air 0,049% dan kadar metil ester sebanyak 63,41% telah memenuhi Standard  Nasional Indonesia (SNI 7182:2015) kecuali pada kadar metil ester.   Biodiesel is a renewable fuel that can be produced from vegetable oil and animal fat. One of the raw materials that can be used in making biodiesel is used cooking oil. Used cooking oil is waste that if left untreated will cause environmental pollution. Used cooking oil has the potential to be used as biodiesel because it contains triglycerides and fatty acids through a transesterification process using a catalyst. Coal fly ash can be used as a catalyst because it contains metal and alkali components consisting of SiO₂, Al₂O₃, and Fe₂O₃ impregnated with NaOH. This study was conducted to determine the effect of transesterification reaction time and catalyst concentration on biodiesel yield. The catalyst was made by calcining fly ash at a temperature of 540˚C for 1 hour, then impregnated with NaOH and calcined at a temperature of 750˚C for 1 hour. The transesterification process was carried out by reacting used cooking oil and methanol with a ratio of 1:9 with reaction time (1, 2, and 3 hours) and catalyst concentration (3, 4, and 5%) of 100g of used cooking oil. The results showed that the optimum reaction time was at 1 hour with a catalyst concentration of 5% producing a yield of 68.17%, a density of 0.85g/ml, a kinematic viscosity of 3.58 cSt, a water content of 0.049% and a methyl ester content of 63.41% has met the Indonesian National Standard (SNI 7182:2015) except for the methyl ester content.
Comparison effect of cv 12, st 36 and st 40 ea on short term energy balance regulation in high fat diet rat Rejeki, Purwo Sri; Harjanto, Harjanto; Argarini, Raden; Subadi, Imam
Folia Medica Indonesiana Vol. 52, No. 3
Publisher : Folia Medica Indonesiana

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Abstract

The aim of this study was to determine the comparative effects of EA (EA) on the CV12, ST36 and ST40 to weight gain prevention over the short-term regulation of energy balance. The study was conducted with a completely randomized design. Rats were divided into five groups: negative control group (no treatment, n=5), positive control (sham EA/back, n=5), EA CV 12 (n=6), EA ST 36 (n=6) and EA ST 40 (n=7). Rats were exposed to high-fat diet for two weeks and EA was simultaneously performed once daily, five days a week for two weeks with 2 Hz, for 10 minutes with continuous wave. Body weight, BMI, front limb circumference and rear were measured during study. Levels of blood glucose, cholesterol, triglycerides, LDL and HDL were measured at the end of the study; which reflects the short-term regulation of energy homeostasis. For weight loss, EA CV12, ST36 and ST40 group have lost weight significantly compared to the negative and positive control group. The ST40 group has a significant decrease than ST36 and CV12. The most significant decrease in BMI found in the ST40 group. EA did not affect blood glucose levels, but modulated blood lipid profile. In ST 40 group there was a significant decrease in cholesterol, LDL and triglycerides. EA at point ST 40 is potential in preventing increased body weight and BMI in rats exposed to high-fat diet compared to the CV 12 and ST 36. ST 40 is a point with a potential of lowering LDL and triglycerides serum so that it can play a role in the short term regulation of energy homeostasis but also in the prevention of dyslipidemia.
Glut-1 is a promising target for atp depletion on diabetic energy deficiency syndrome Purwanto, Bambang; Harjanto, Harjanto; Asnar, Elyana
Folia Medica Indonesiana Vol. 53, No. 3
Publisher : Folia Medica Indonesiana

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Abstract

Diabetes is a metabolic syndrome which characterized with insulin insensitivity, lack of GLUT-4 membrane presentation and ATP deficiency. ATP is needed for substrate phosphorylation, signalling pathways, protein translation and cellular survival. Since GLUT-1 was discovered as alternative glucose transporter on muscle membrane, some studies started to investigate it more. This study aimed to investigate GLUT-1 presentation on diabetes muscle membrane of rat model in time. Diabetes was obtained from a 50 mg/kg B.W of streptozotocin intra peritoneal injection on rat. We found that GLUT-1 presentation increased significantly in time of diabetic stages. It correlated negatively with GLUT-4 presentation and mortality. Eccentric downhill running on diabetic rat model improved GLUT-1 presentation and blood glucose level. It was promising for diabetes management therapy at the future.
EVALUATION OF THE USE OF STAR FRUIT LEAF ADHESIVE ON THE COMPRESSIVE STRENGTH AND DURABILITY OF BRIQUETTES MADE FROM DURIAN PEEL CHARCOAL AS AN ALTERNATIVE FUEL Umul, Istikhomah; Rizki, Annisa; Yusuf, Madjid; Harjanto, Harjanto
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Volume 8, ISSUE 1, 2023
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol8.iss1.art2

Abstract

Energi fosil memiliki jumlah yang terbatas dan tidak dapat diperbarui. Oleh karena itu diperlukan sumber energi terbarukan agar tidak tergantung dengan sumber energi fosil. Penelitian ini bertujuan untuk mengevaluasi pengaruh jenis dan persentase bahan perekat yang digunakan terhadap nilai kuat tekan dan durabilitas briket kulit durian.  Bahan utama yang digunakan dalam pembuatan briket adalah kulit durian. Bahan perekat yang digunakan adalah daun belimbing wuluh dengan persentase 0%, 2%, 4%, 6%, 8%, dan 10%. Pada penelitian ini dilakukan uji karakterisasi terhadap briket yang dihasilkan dengan acuan ISO 17225-1 dan ASAE S 269.4. Hasil penelitian menunjukkan bahwa nilai kuat tekan terbaik dengan konsentrasi perekat 0% (8,51kg/cm2) dan nilai durabilitas terbaik dengan konsentrasi perekat 8% (92,7%). Berdasarkan hasil pengujian diketahui bahwa penambahan bahan perekat menyebabkan nilai kuat tekan dan nilai durabilitas cenderung menurun.
Co-Authors Abda Abda Alwathan Alwathan Ayu, Sekar Bambang Purwanto David Do Rosario Marques Elyana Asnar Fadilah, Muhammad Reza Firman Firman Haryuni Hery Kristiyanto Imam Subadi Irwan, Muh. Kurniawan, Diva Oita Mohd-Setapar, Siti Hamidah Muchamad Arif Budiyanto Musdalifah Musdalifah Nurokhman, Nurokhman Okko, Sarifudin Oko, Syarifuddin Purnama, Giri Raden Argarini Ramli Thahir Rejeki, Purwo Sri Rizki, Annisa Rochmadi Rochmadi Samosir, Damianus Sirajuddin Sirajuddin Sitti Sahreni Teguh Supriyadi Toyo, Rahmat Budi Umul, Istikhomah Wahyudi Wahyudi Yusuf, Madjid