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All Journal IPTEK Journal of Proceedings Series Simetris Rekayasa Mesin JITEK (Jurnal Ilmiah Teknosains) Jurnal Rekayasa Konstruksi Mekanika Sipil BERNAS: Jurnal Pengabdian Kepada Masyarakat Mechanical Engineering for Society and Industry
Ristiyanto, Hartono Guntur
STT Ronggolawe Cepu
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Modelling Modal Shift Preference of Freight Transport on Surabaya-Jakarta Corridor : A Preliminary Survey R, Hartono Guntur; Mochtar, Indrasurya B; Widyastuti, Hera
IPTEK Journal of Proceedings Series No 6 (2017): The 3rd International Conference on Civil Engineering Research (ICCER) 2017
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2017i6.3251

Abstract

The market share of freight transport which is dominated by road transport and accompanied by unbalanced of infrastructure’s growth and freight demand has created various negative impacts on existing transportation system. The shift of freight transport from road to rail and sea is expected to reduce those impacts. Research on the behavior of freight mode choice and the extent to which the user is willing to trade off the attribute change needs to be done so that the amount of modal shift will be known. The main objective of the study was to produce a model of mode choice based on preference surveys among forwarders, as well as to provide inputs for policy improvement and or improvement of freight transportation services. One of the surveys to be conducted is the revealed preference (RP) survey. The important stage before the RP survey is to conduct a preliminary survey. This stage aims to determine the important trends related to the choice of modes by the forwarder and test the response rate of respondents. The survey is also useful for assessing the credibility of the data instrument, identifying potential errors in the data instrument, and determining non-conformities in survey management before the actual survey. Data collection was done by sending questionnaires. The structure of the questionnaire consists of questions about characteristics of : shipment, travel, and modes. The results of survey showed relatively low response rate because it was only 8 respondents who were willing to answer the questionnaire. This indicates that the questionnaire needs to be combined with other methods, such as: face to face interviews and or focus groups. The results of the preliminary survey show that the main factors for the choice of existing modes are: shipment costs, loss/damage, and time travel. The implementation of the next stage survey should consider that each company has more than one shipping commodity so it is necessary to group questions and analysis based on each commodity.
PEMILIHAN MODA ANGKUTAN UMUM KERETA API DAN BIS EKONOMI (RUTE : CEPU-SEMARANG ) Hartono Guntur Ristiyanto; Bambang Supranoto
SIMETRIS No 18 (2014): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The mode choice of public transport could be the most important stage in transportation planning. Because of its key role in many transportation policies. Passenger mode choice behaviour based on the mode characteristics and level of service, as well as user characteristics. It is necessary to figure out the preference of mode choice between train and bus route of Cepu-Semarang economic class. This recearch aims to develop mode choice model and analyse sensitivity of the mode choice of public transport. The approach used in this research is stated preference technique. Independent variables are the difference value of : travel cost, travel time, and acces time between train and bus. Data analysis on model is carried out using binomial logit model, and estimation of model parameter is carried out using multiple regression analysis. Results of descriptive analysis showed that majority of respondents option is “definitely train”. It is also shown that train was given preference over bus. According to statistics test, travel cost attribute is excluded from analysis due to its colinearity. Mode choice model obtained from analysis is : Pilihan = 1,045-2,011*∆Travel Time-0,023*∆Acces Time, and probability model of mode choice is : . Based on the direct and cross elasticity, the travel time attribute has bigger elasticity value than acces time.Travel time is more sensitive than acces time in choice probability of train and bus.
Analisis Dampak Infrastruktur Terhadap Pertumbuhan Ekonomi di Kabupaten Blora Hartono Guntur Ristiyanto
SIMETRIS Vol 14 No 1 (2020): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Infrastruktur perekonomian dibutuhkan untuk meningkatkan produktivitas, memperlancar proses distribusi barang dan jasa serta meningkatkan efektivitas dan efisiensi operasional dunia usaha. Infrastruktur perekomian juga mempunyai peranan yang sangat penting dalam menggairahkan iklim dan perkembangan investasi di daerah. Untuk itulah pemerintah daerah perlu memberikan perhatian dalam penyediaan infrastruktur di daerahnya, agar perekonomian daerah dapat bertumbuh dan berkembang dengan baik. Keterkaitan antara infrastruktur dengan pertumbuhan ekonomi masyarakat perlu diketahui bagi stakeholder terkait untuk kepentingan evaluasi dan pembangunan infrastruktur sejak dari penyusunan anggaran, perencanaan, pelaksanaan, dan perawatan infrastruktur. Sehingga diharapkan pembangunan infrastruktur akan tepat sasaran dan mampu memberikan kapasitas layanan yang sesuai dengan potensi daerah yang akhirnya bermuara kepada peningkatan pertumbuhan ekonomi masyarakat. Oleh karena itu, penelitian tentang keterkaitan infrastruktur dan pertumbuhan ekonomi perlu dilakukan. Penelitian bertujuan menganalisis keterkaitan hubungan antara infrastruktur dengan Produk Domestik Regional Bruto (PDRB). Variabel dependen dalam penelitian ini adalah PDRB Atas Dasar Harga Konstan (ADHK). Sedangkan variabel independen adalah : luas lahan teririgasi, panjang jalan dan jembatan, daya listrik tersambung, dan jumlah air bersih tersalur. Metode untuk menganalisis keterkaitan infrastruktur dengan PDRB Kabupaten Blora adalah dengan analisis data time series dan analisis data panel, yaitu data gabungan time series dan cross section. Hasil analisis menunjukkan infrastruktur jalan kabupaten merupakan infrastruktur yang paling signifikan menjelaskan hubungan peningkatan PDRB dengan jenis infrastruktur di Kabupaten Blora, dengan bentuk persamaan matematika : PDRB = 3,368 + 0,013*PANJANG JALAN KABUPATEN. Interpretasi persamaan model di atas adalah : setiap pertambahan panjang jalan kabupaten sebesar 1 km, maka akan menaikkan PDRB sebesar 0,013%.
Analisis Kualitas Air Sungai Hasil Penyaringan Filter Berbasis Arang Sekam Hartono Guntur Ristiyanto
SIMETRIS Vol 14 No 2 (2020): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v14i2.132

Abstract

Industrial waste pollution from the upstream of the Bengawan Solo river, makes the river's quality unfit for various purposes. Water filtering needs to be done first to improve its quality. One of them is the absorption process. One of the adsorbents that have good prospects is rice husk waste because of its ability to bind the adsorbate components. Study related to the effectiveness of rice husk charcoal as a water filter material need to be carried out before it can be used as a water filter material. Making appropriate filter technology needs to be done to apply it. The results of the analysis show that the filter can improve the physical parameters of water, namely reducing the residue by 25% on average. Meanwhile, from inorganic chemical parameters, only DO (Dissolved Oxygen) elements have decreased in quality standards. The organic chemical parameters, namely the phenol content are relatively constant, this indicates that rice husk charcoal is not effective in binding phenols. Based on Government Regulation No. 82 of 2001, the filtered water is classified as Class I. However, in its use, other parameters that have not been studied should be studied, namely microbiology, other organic chemistry, radioactivity, etc.The technological capacity needs to be increased by the use of a larger body and or a reduction in the thickness of the filter layer. Meanwhile, the manufacture of rice husk charcoal should use controlled combustion mechanisms and or husk charcoal activation with the chemical Na OH to strengthen the properties of the husk charcoal adsorbent against harmful chemical compounds.
Kajian Dampak Tata Guna Lahan terhadap Kinerja dan Biaya Tundaan Simpang (Studi Kasus : Simpang Tiga Jl. GOR – Jl. A. Yani, Kota Blora) Hartono Guntur Ristiyanto
SIMETRIS Vol 15 No 1 (2021): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i01.153

Abstract

The current land use have made the corridor of Jalan GOR in Blora Regency plays an important role in the aspect of transport demand. The area’s development must be balanced with the adequate transport supply in such a way that it will minimize the negative impact due to the imbalance between demand and transport supply. One of the existing transport supply is an unsignalized intersection at the eastern end of the corridor. The potential problem due to the existence of nearby land uses, such as gas stations, on intersection performance is : the presence of delays. Based on those research backgrounds, the formulation of the research problem is: how does the existence of gas station affect the intersection performance and the cost of delay? This research aims to analyze the performance of intersections due to the existence of gas stations. The results of the analysis show that the existence of gas station gives various contribution to intersection performance parameters. Respectively, the biggest effect occurred on the increase in vehicle volume, degree of saturation, and total delay (especially traffic delay). Overall, the existence of a gas station has no effect on the level of service’s value of the intersection. Meanwhile, the value of the highest delay costs occurs during the peak hours of the day. The predicted intersection performance without any geometric improvement for 5 years will begin to decline in third year. Meanwhile, if the intersection is widened, it will begin to decline in the fourth year. However, this geometric improvement has only a very small effect on intersection performance.
ANALISIS KARAKTERISTIK PERJALANAN MENUJU KAWASAN PERKANTORAN JALAN GOR MUSTIKA KABUPATEN BLORA Hartono Guntur Ristiyanto
JITEK (Jurnal Ilmiah Teknosains) Vol 8, No 2/Nov (2022): JiTek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v8i2/Nov.12152

Abstract

Informasi terkait karakteristik perjalanan menuju suatu kawasan dibutuhkan untuk keperluan pemodelan transportasi. Model transportasi akan membantu pemerintah dalam mengantisipasi permintaan transportasi dan pengaruh pengembangan penggunaan lahan. Penelitian ini bertujuan untuk menganalisis karakteristik dan pola sebaran perjalanan menuju kawasan Jalan GOR Mustika Blora. Analisis dibatasi pada perjalanan menuju perkantoran OPD Kabupaten Blora. Variabel yang digunakan dalam penelitian ini adalah jumlah perjalanan sepeda motor dan kendaraan roda 4 serta jarak atau waktu perjalanan kedua moda. Metode pengumpulan data menggunakan metode survei melalui google form. Analisis data meliputi analisis data deskriptif karakteristik perjalanan responden, analisis sebaran perjalanan, dan garis keinginan (desired line). Hail analisis menunjukkan bahwa perjalanan didominasi oleh kendaraan roda dua. Sedangkan rentang waktu tempuh perjalanan mayoritas berdurasi 6-10 menit. Hasil analisis persamaan jumlah perjalanan sebagai fungsi waktu tempuh menunjukkan bahwa kendaraan roda dua lebih sensitif terhadap perubahan waktu tempuh dibanding pengguna roda empat. Pola spasial perjalanan dalam kota menuju kawasan perkantoran tersebut didominasi oleh responden yang berdomisili di wilayah barat dan selatan dari kawasan perkantoran. Hasil analisis bisa dimanfaatkan untuk pemodelan lebih lanjut yaitu kalibrasi model distribusi perjalanan dan pembebanan rute untuk penentuan skala prioritas pengembangan infrastruktur maupun manajemen lalulintas
Analisis Tarikan Perjalanan dan Pola Sebaran Panjang Perjalanan ke Kawasan Pendidikan (Studi Kasus : Kawasan Pendidikan Jalan Gatot Subroto, Kabupaten Blora) Hartono Guntur Ristiyanto
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.258

Abstract

The existence of schools on Gatot Subroto Street has potential impact to generate a number of trips. The area’s development must be balanced with the provision of adequate transportation. The first step that needs to be taken is to provide information regarding the characteristics of the attraction and distribution patterns of trips to the area in such a way that the demand for transportation can be anticipated. Therefore, the formulation of the research problem is: what are the characteristics of the attraction and the pattern of distribution of trips to the educational area of ​​Gatot Subroto Street, Blora Regency? While the purpose of the research is to analyze the attraction of trips and distribution patterns of trips to the area. Secondary data was obtained from the school and the Blora District Education Office, namely: teacher and employee population, student population, mode used, land area, building floor area, and parking area. Primary data was obtained from an interview survey via google form. The dependent variable is the number of trips and the independent variables: number of students, teachers & employees, land area, floor area, parking area. Based on the results of the analysis, trips attraction is strongly influenced by the population of travelers. The second variable that has a statistically significant effect is the size of the parking area. Most trips to this area have a range of 3-6 km. While the trip barrier function that best describes the trip distribution is the exponential function. The limitation of this research is that it is not yet known how the impact of Covid-19 has on travel attraction. The research results can be used as a basis for further research, namely the calibration of the transportation demand model. Zoning also needs to use village-based travel origin zones to obtain more accurate analysis results
Review on swirl-type microbubble generator: Concept, technology, and applications Drajat Indah Mawarni; Hartono Guntur Ristiyanto; Deendarlianto Deendarlianto; Wiratni Budhijanto; Mai Salem; Hakeem Niyas; Indarto Indarto
Mechanical Engineering for Society and Industry Vol 3 No 3 (2023): Special Issue on Technology Update 2023
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.10565

Abstract

The Microbubble Generator (MBG) is an aeration technology capable of producing micron-sized bubbles. Several researchers have conducted previous studies and developed various types related to the microbubble generator. The swirl-type microbubble generator has demonstrated advantages over other types. It has been widely explored recently due to its simple structure, efficiency in producing micron-sized bubbles, and potential applications across various fields. Therefore, this article reviews recent developments in swirl-type bubble generator research, encompassing the definition of microbubbles, methods for generating microbubbles through experimental and numerical approaches, the performance of microbubble generators, and their applications. Based on optimized geometric parameters combined with appropriate flow conditions, the swirl-type bubble generator is predicted to produce bubbles with controlled sizes and concentrations that meet specific requirements. However, further studies are needed to delineate the fluid-gas interactions comprehensively.
KAJIAN EKSPERIMENTAL PENGARUH PARAMETER OPERASI TERHADAP PEMECAHAN GELEMBUNG DAN KINERJA PEMBANGKIT GELEMBUNG MIKRO TIPE SWIRL Mawarni, Drajat Indah; Budhijanto , Wiratni Budhijanto; Deendarlianto , Deendarlianto; Ristiyanto , Hartono Guntur Ristiyanto; Marahendra , Wawan Dedi Marahendra; Indarto , Indarto
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1611

Abstract

In this study, we present the bubble breaking mechanism of the rotating flow in the swirl type microbubble generator (MBG) on the resulting performance in this case the oxygen dissolution rate. This type of MBG is an aeration technology and has been developed in recent years by utilizing the turbulence of liquid fluid flow to produce micron-sized bubbles. The pressure difference created by changing the cross-sectional diameter causes air to be sucked in automatically in the mixing channel and forms a bubble channel before finally bursting to form micron-sized bubbles at the MBG outlet. The experiment was carried out in a transparent container measuring 2.8 m x 0.6 m x 0.6 m which was filled with water as high as 0.4 m. This study is focused on studying the mechanism of bubble breakdown at the MBG outlet on the dissolution rate of oxygen (dissolved oxygen/DO) which is influenced by the volumetric flow rate of liquid (Q_L) and volumetric flow rate of air (Q_G). Various combinations of Q_L and Q_G values were systematically compared with the resulting oxygen mass transfer coefficient (KLa) values. Dissolved oxygen (DO) values were measured at a distance of 60 cm from the MBG outlet. The final results of the study revealed that the higher the Q_Lvalue, the more frequent the intensity of bubble bursting, the greater the number of bubbles produced with the smaller diameter and the higher the DO value, and vice versa. Whereas the higher the Q_Gvalue, the intensity of the bubble breakdown that occurs is relatively the same, the number of bubbles produced is less and the diameter is larger and the DO value is lower, and vice versa.
Analisis Lokasi Rawan dan Biaya Kecelakaan Ruas Jalan Bojonegoro-Ngawi KM.33-KM.63 Ristiyanto, Hartono Guntur
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.325

Abstract

The Bojonegoro-Ngawi highway KM.33-KM.63 is part of the national road that connects the provinces of East Java and Central Java. One of the strategic roles of this road segment is that it is the closest access to the Trans Java toll road Solo-Kertosono section. Accidents on these roads have the potential to result in a decrease in the performance of these roads, namely in the aspect of road user safety. Therefore, it is necessary to conduct a study of accident-prone areas on this road section. Accident data available at the time the research was conducted was still in the form of tabulation of raw accident data. Information regarding accident-prone locations and costs is not yet available. This information is needed in an effort to improve traffic safety for the prevention and handling of accidents. Based on the background of the problem, the formulation of the research problem is: where are the accident-prone locations and what are the costs incurred? Analysis of accident-prone locations uses the Equivalent Accident Number (EAN) and Upper Control Limit (UCL) methods and the accident cost analysis method uses the Gross Output method. The results of the analysis of accident-prone locations show that there are 12 segments whose AEK values ​​are above the limit value or UCL. The biggest loss in an accident is caused by the death toll. While the largest accident classification costs occur in fatal accidents. Meanwhile, the analysis of accident costs per road segment based on the type of accident victim shows that the top 3 segments with the highest accident costs are identical to the results of the analysis of AEK and UCL values. The limitation of this research is that it has not considered qualitative losses. This method does not include compensation for pain, fear, grief or suffering. Therefore, for further research it is necessary to carry out a more comprehensive analysis regarding the types of material and non-material losses
Co-Authors Ari Puji Prasetiyo Bambang Supranoto Bambang Supranoto Budhijanto , Wiratni Budhijanto Deendarlianto , Deendarlianto Deendarlianto Deendarlianto Drajat Indah Mawarni Firdaus, Salma M Gunawan, Helmi Hakeem Niyas Hera Widyastuti Indarto , Indarto Indarto Indarto Joko Handoyo JUNAIDI, MUKSAN Khusaini, Fallah Mai Salem Marahendra , Wawan Dedi Marahendra Mochtar, Indrasurya B Rahmanto, Andi Wiratni Budhijanto