Rohman Rohman - Academia.edu (original) (raw)

Papers by Rohman Rohman

Automotive Experiences

The present study features analytical and experimental results of optimizing resistance spot weld... more The present study features analytical and experimental results of optimizing resistance spot welding performed using a pneumatic force system (PFS). The optimization was performed to join SECC-AF (JIS G 3313) galvanized steel material with SPCC-SD low carbon steel. The SECC-AF is an SPCC-SD (JIS G 3141) sheet plate coated with zinc (Zn) with a thickness of about 2.5 microns. The zinc coating on the metal surface causes its weldability to decrease. This study aims to obtain the highest tensile-shear strength test results from the combination of the specified resistance spot welding parameters. The research method used the Taguchi method using four variables and a combination of experimental levels. The experimental levels are 2-levels for the first parameter and 3-levels for other parameters. The Taguchi optimization experimental results achieved the highest tensile-shear strength at 5049.64 N. It properly worked at 22 squeeze time cycles, 25 kA of welding current, and 0.6-second wel...

Jurnal Teknik Mesin Mechanical Xplore

This study focuses on plastic welding, a technique that employs polypropylene plastic material in... more This study focuses on plastic welding, a technique that employs polypropylene plastic material in 3600-litre reservoir applications. The liquid pressure within it causes hydrostatic pressure in the reservoir. The pressure in the reservoir is approximately 0.01 N/mm2. This study aimed to determine how frequently polypropylene joints leak or sustain damage as a result of welding. Hot gas welding (HGW) with a v-groove connection type is employed (v-grove). Specimens of polypropylene were prepared in accordance with ASTM D638-I. In this study, the input parameters were chosen by varying the welding position and the machine's setting temperature. The results indicated that the required welding temperature for 5 mm-thick polypropylene plastic ranged between 220 and 280 degrees Celsius. In the tensile test on samples S1, S2, and S3, the average decrease in tensile strength of the three test objects was 13.84 N/mm2, 15.98 N/mm2, and 15.21 N/mm2, respectively

INTERNATIONAL CONFERENCE ON LIFE SCIENCES AND TECHNOLOGY (ICoLiST 2020), 2021

This paper discusses the mother's struggle for children learning mentoring during the Covid-1... more This paper discusses the mother's struggle for children learning mentoring during the Covid-19 Outbreak in the Rural. We argue the unpreparedness of the education system in dealing with crises puts mothers in unpredictable and submissive situations. Interesting research because earlier studies have not been able to properly reveal their role. The narrative approach is used to access heroic stories, sacrifices, and full of meaning. We collected 47 informant data, but only 16 women were willing to be interviewed in-depth using six open-ended questions. We find five key narratives of mothers' experiences: the knowledge struggle, the technology struggle, the economic struggle, the emotional struggle, and the physical struggle. Unexpectedly before, mothers also suffer fatigue and pain for physical struggle. Gender stereotypes and social norms as village women are discussed. This research emphasizes the importance of education policy intervention in times of crisis, especially in ...

The phenomenon at this time, we often find children no longer respect parents, anti-social attitu... more The phenomenon at this time, we often find children no longer respect parents, anti-social attitudes that appear from everyday life both at school and society. In global competition, a nation needs to be an innovative nation to become a superior nation. Then the need for a strong order of values and policies so that the crisis of culture and national disintegration does not occur in Indonesia. Education in Indonesia must instill national character and spirit originating from the nation's cultural roots and based on Pancasila as the basis of country, philosophy, and noble values. Through, citizenship education learning is expected to be a solution in fostering citizens who have social awareness.

This research was conducted by referring to the users of Digital Services to Purchase Tickets at ... more This research was conducted by referring to the users of Digital Services to Purchase Tickets at PT. PELNI. This study aims to analyze the Effectiveness of Digital Services, Mobile-based Applications, that can facilitate interaction between stakeholders involved in passenger activities through sea transportation modes effectively and efficiently during the Covid-19 pandemic. The spplication was made based on the needs of users of the Sea Transportation Services. This study used the theory of the D&M information system success model by De Lone and Mc Lean in 2003. In this study, there are six indicators namely system quality, information quality, service quality, user intentions, user satisfaction, and net benefits. The method used in this research is descriptive quantitative. Data collection method was carried out by distributing 100 questionnaires to Pelni Mobile application users. To determine the sample, this researchapplied Slovin formula because the number of users of Pelni mob...

Selain menghasilkan kayu perkakas dan kayu bakar, hutan rakyat sebagaimana hutan pada umumnya jug... more Selain menghasilkan kayu perkakas dan kayu bakar, hutan rakyat sebagaimana hutan pada umumnya juga berfungsi sebagai penyimpan karbon, sehingga memainkan peran yang sangat penting di dalam siklus karbon global (the global carbon cycle). Penelitian ini dilakukan untuk (a) mengetahui jenis-jenis tanaman berkayu mulai dari tingkat tiang (poles: D = 10 cm) di hutan rakyat Desa Nglanggeran, (b) mengetahui karakteristik pertumbuhan tanaman berkayu penyusun hutan rakyat meliputi pertumbuhan diameter batang setinggi dada, tinggi, kerapatan pohon dan luas bidang dasarnya, dan (c) mengetahui kandungan biomasa dan karbon. Hasil penelitian ini menunjukkan ada 25 jenis tanaman berkayu yang ditanam dan dikembangkan oleh masyarakat petani hutan rakyat di Desa Nglanggeran yang sebagian besar menanam dan mengembangkan jenis tanaman mahoni. Rata-rata diameter batang setinggi dada untuk jenis-jenis tanaman berkayu mulai tingkat tiang (poles: dbh = 10 cm) adalah 20,8 cm (kisaran: 17,0 - 27,3 cm), dan t...

MODEL HOUTVESTERIJ UNTUK RASIONALISASI PENGORGANISASIAN KPH LINDUNG BALI TENGAH, PROVINSI BALI OL... more MODEL HOUTVESTERIJ UNTUK RASIONALISASI PENGORGANISASIAN KPH LINDUNG BALI TENGAH, PROVINSI BALI OLEH: Dwiko Budi Permadi, Ris Hadi Purwanto, Rohman*1 Abstract Establishing forest management unit is the toppest priority among eight Forestry Departement's National Agendas within the next five years. The division of forest boundaries into forest managemen unit (KPH) is a necessary condition to achieve sustainable forest management. After dividing into forest managemen unit offi¬cially, however, the efficiency and effectiveness of forest subdivision within a forest management unit is remain¬ing unclear and frequently irrational. It is because the main operational guidance on it is not available yet. To rationalize such problem, this study is trying to review actual conditions of forest subdivision in KPH Bali Tengah and then studying how to adopt a Bruinsma's proposal called houtvesterij that already used to reorganize forest management unit in Java more than a century ago. This ...

Bhineka Tunggal Ika: Kajian Teori dan Praktik Pendidikan PKn, 2020

Penelitian ini bertujuan untuk mengetahui dan menguji pengaruh budaya sekolah terhadap aplikasi n... more Penelitian ini bertujuan untuk mengetahui dan menguji pengaruh budaya sekolah terhadap aplikasi nilai-nilai karakter bangsa pada siswa SMA Adiguna Bandar Lampung.Penelitian ini merupakan penelitian deskriptif dengan pendekatan kuantitatif. Populasi yang digunakan dalam penelitian ini adalah seluruh siswa SMA Adiguna Bandar Lampung yang berjumlah 595 orang. Sampel dalam penelitian ini berjumlah 86 siswa. Teknik pengambilan sampel digunakan teknik stratified proportional random sampling (acak). Berdasarkan hasil penelitian dan pembahasan dapat disimpulkan bahwa terdapat pengaruh budaya sekolah terhadap aplikasi nilai-nilai karakter bangsa pada siswa SMA Adiguna Bandar Lampung. Semakin baik budaya sekolah yang diterapkan oleh siswa, maka akan semakin baik pula aplikasi nilai-nilai karakter yang dimiliki oleh siswa. Kesimpulan ini diambil karena dari hasil perhitungan diketahui koefisien korelasi antara budaya sekolah dengan aplikasi nilai-nilai karakter bangsa t hitung sebesar 10,781 s...

Community Empowerment, 2021

The objective of this paper is to increase the comprehension of teachers on the significance of a... more The objective of this paper is to increase the comprehension of teachers on the significance of authentic assessment in Civic Education, particularly with a scientific approach and quality learning process. Therefore, adequate skill support for developing these channels, specifically in relation to character and learning activities in the form of attitude scales and guidelines. Expository, discussion, assignment, training, individual or group mentoring were among the applied community empowerment methods. Based on this assistance, teachers' understanding of the design and implementation of authentic assessment instruments in the 2013 curriculum was greatly increased. Furthermore, it is expected that the knowledge learned is simultaneously integrated into the learning process.

Jurnal Penelitian Kehutanan Faloak, 2017

Utilization of non-timber forest products, especially cajuput plants in Indonesia needs to be opt... more Utilization of non-timber forest products, especially cajuput plants in Indonesia needs to be optimalized. The management of cajuput plantations should be supported with data and information toward sustainable management. The plot size to estimate the potential of cajuput leaves has not been determined. Therefore, the determination of the optimal plot size which be used to invent cajuput plantations was carried out in this study. Cajuput stands having good degree of normality were used in this study. Several sample plots size of 20 x 20 m, 30 x 30 m, 40 x 40 m, 50 x 50 m, 60 x 60 m, 70 x 70 m, 80 x 80 m, 90 x 90 m, and standard plot (control) 100 x 100 m were used in this study. Parameters measured were number of tree (n/ ha) and the biomass of cajuput leaves-twig (Kg / ha). Data were analyzed by using t-student test to determine the difference of mean value between sample sample plot and control plot. The analysis was also done by calculating the precision of each sample plot. The result showed that the estimated value of number of tree (n / ha) of the 20 m x 20 m plot size was not significantly different with the control plot size of 100 m x 100 m. Estimation of leaves-twigs biomass of cajuput with plot size of 20 m x 20 m plot was also not significantly different with the result of measurement of leaves-twigs biomass of cajuput in control plot 100 m x 100 m. It can be summarized that the optimum plot size that can be used in the study site is 20 m x 20 m.

Jurnal Ilmiah Syi'ar, 2020

Poda Na Lima is Angkola-Mandailing local wisdom means five advices which are used as a basis for ... more Poda Na Lima is Angkola-Mandailing local wisdom means five advices which are used as a basis for the formation of islamic character of its people in their life. This local wisdom has dealt with islam such as to maintain cleanliness and purity both mentally and physically. This study explains about how Islamic character based on “Poda Na lima” local wisdom in Angkola-Mandailing community. The five basic values of Poda Na Lima are paias rohamu (the obligation to purify your hearth), paias pamatangmu (the obligation to purify your body), paias parabitonmu (the obligation to clean your clothes), paias bagasmu (the obligation to clean your house) and paias pakaranganmu (the obligation to clean the environment). This type of research was qualitative using a qualitative descriptive approach. Data collection techniques are done by observation, in-depth interviews and literature review that examines directly about Poda Na Lima. Data analysis used systematically starting from data collection,...

ALQALAM, 2011

Makalah ini mencoba menJelaskan fragmentasi otoritas keagamaan di Indonesia, lebih khusus lagi di... more Makalah ini mencoba menJelaskan fragmentasi otoritas keagamaan di Indonesia, lebih khusus lagi di Provinsi Banten. Bagian pertama dalam artikel ini membahas tentang SeJarah perkembangan otoritas keagamaan dan pendirian organisasi Islam tradisional dan modern di awal abad ke-20, termasuk pendirian MUI sebagai usaha pemerintah untuk mempersatukan organisasi-organisasi Islam di Indonesia. Bagian kedua membahas tentang 'ulama' Banten, organisasiorganisasi Islam di Banten, dan pendirian MUI Banten. Dalam mengenali karakteristik otoritas agama, kita bisa menghargai bagaimana muslim Indonesia berjuang untuk menemukan sumber valid bagi otoritas keagamaan yang memikiki hak untuk berbicara tentang Islam.Kata Kunci: otoritas keagamaan, organisasi muslim tradisionalis dan modernis,

Afkaruna, 2013

saat ini dianggap sebagai bagian integral dari tradisi Banten. Terdapat beberapa studi tentang De... more saat ini dianggap sebagai bagian integral dari tradisi Banten. Terdapat beberapa studi tentang Debus di Banten dan di tempat-tempat lainnya di Indonesia, yang banyak diantaranya merupakan studistudi antropologis. Sedikit sekali perhatian yang telah diberikan studi mendalam tentang debus yang diptaktikkan oleh orang-orang Banten. Faktanya, debus telah berkembang sebagai pertunjukan kekebalan dan lebih dari sekedar pertunjukan kekebalan di Aceh sebagaimana yang pernah dideskripsikan oleh Snouck pada akhir abad ke Sembilan belas. Penulis mencoba menunjukkan bagaimana praktik debus yang dikombinasikan dengan aspek-aspek tarekat saat ini agaknya memasukan banyak atribut baru.

Small-scale Forestry, 2016

Smallholder timber plantations may offer opportunities for farmers to increase their income. None... more Smallholder timber plantations may offer opportunities for farmers to increase their income. Nonetheless, such opportunities are often lost largely due to unfavorable regulations imposed on harvesting and marketing of timber. Adverse impacts are worsened because the regulations are not effectively communicated to smallholder farmers. We assessed the level of smallholder knowledge of existing regulations and found it very low. In part, this correlated to their socio-demographic characteristics. Poor literacy skills and a low level of education make it difficult for older farmers' to increase their knowledge. This is compounded by the limited information channels that can reach the farmers. Improving smallholders' knowledge by providing information concerning markets and regulations in a timely and clear manner could help smallholders exercise coping strategies and priorities when selling their timber that would in turn reduce the negative impacts of regulations. The roles of village authorities could be crucial. They are close to the smallholders and could channel the information. The government could provide training and incentives for them to be more active in communicating the regulations to the smallholders.

Jurnal Manajemen Hutan Tropika (Journal of Tropical Forest Management), 2014

The degradation of teak forest plantations in Java that are managed by Perum Perhutani (PP) conti... more The degradation of teak forest plantations in Java that are managed by Perum Perhutani (PP) continues to happen, and this is caused by some risk factors such as illegal logging, grazing, forest fire, and encroachment. However, these risk factors have not been considered by PP notably in annual allowable cut (AAC) determination of yield regulation. Therefore, the AAC value could be overestimated. The research was aimed at evaluating the method of AAC determination and proposing an alternative method that considers the risk factors. This research was conducted with a series of data analysis approach from the data on five planning periods. The research result showed that forest damage occurs in varied situations. On average, the rate of deforestation accounted for 0.8% per annum. The calculation of AAC by considering the rate of damage risk in normal condition approximately made up 70.8%. Thus, compared to another method without considering damage risk rate, overestimation constituted 29.2%. In brief, this had an impact on the decline of timber stock.