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All Journal HAYATI Journal of Biosciences Jurnal Ilmu Pertanian Indonesia Biotropika Jurnal Biologi Universitas Andalas Journal of Tropical Biodiversity and Biotechnology Jurnal Teknik Sipil Jurnal Biodjati JISIP: Jurnal Ilmu Sosial dan Pendidikan Science Education and Application Journal Majalah Ilmiah Cahaya Ilmu Makara Journal of Science
Rudy Hermawan
Kelompok Keahlian Transportasi, Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung, Jalan Ganesa 10 Bandung 40132.
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Social Sciences

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Kajian Efektifitas Semen dan Fly Ash dalam Campuran Soil Cement Memakai Tanah Lempung dan Pasir Pulau Timor Theodorus, Alfonsus; Sugeng, Bambang; Suratman, Ilyas; Hermawan, Rudy
Jurnal Teknik Sipil Vol 15, No 2 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak. Campuran semen tanah atau Soil cement adalah hasil pencampuran tanah, semen dan air, yang dengan tingkat pemadatan tertentu akan menghasilkan suatu campuran material baru, soil cement, yang mana dikarenakan kekuatannya, karakteristik ketahanan terhadap oleh air, panas dan pengaruh cuaca lainnya adalah sangat baik sebagai suatu lapis pondasi bawah dari struktur perkerasan jalan. Penggunaan Fly Ash sebagai alternatif material untuk stabilisasi dapat digunakan sebagai bahan tambahan campuran Soil Cement. Penelitian ini dilakukan pada beberapa tahapan pengujian, dimana pada tahapan pertama dilakukan pengujian statis terhadap campuran tersebut, antara lain percobaan UCS (Unconfined Compressive Strength). Hasil pengujian menunjukkan bahwa tanah Oelmasi (Pulau Timor) dapat diklasifikasikan sebagai tanah lempung anorganik dengan plastisitas tinggi (CH), tipe tanah kelempungan (A-7-5), Nilai aktiviti (A)=1,30 (Aktif Clays) dan memiliki Swelling Potensial yang sangat tinggi (Very High) serta kandungan mineral Kuarsa (Quartz). Secara umum, 5% - 15% semen menunjukkan jumlah optimum pengurangan Plastisitas Index (PI). Sedangkan 3% - 7% fly ash dapat meningkatkan nilai Plastisitas Index (PI). Pengurangan dan penambahan Plastisitas Index (PI) adalah suatu indikator perubahan kekuatan dari tanah Lempung Anorganic (CH). Penambahan 13%semen pada pemeraman 28 hari nilai Unconfined Compressive Strength (UCS) yang optimal yaitu = 12,59 Kg/Cm2. Untuk Tanah Bolok (Pulau Timor) merupakan jenis Pasir bergradasi baik (SW), tipe tanah pasir (A-1-b) dengan kandungan Mineral Calcite. Penambahan semen 10 % dapat meningkatkan nilai UCS hingga mencapai nilai optimal 21,87 kg/cm2 pada umur pemeraman 28 hari.Abstract. Soil cement is result of mixing soil, cements and water, that with level of certain compaction will make a new material mixture, soil cement, which because of it is strength, resistance characteristic to by water, hot and other weather influence is very good as a foundation layer under from road pavement structure. Usage of Fly Ash alternatively material for stabilization can mixture addition Soil Cement. This research done at some testing steps, where at step first is done static testing to the mixture, for example experiment UCS (Unconfined Compressive Strength). Result of testing indicates that Soil Oelmasi (Island Timor) can be classified as Inorganic Clay Soil with high plasticity (CH), Clay Soil Type (A-7-5), Value activity (A) = 1,30 (Aktif Clays) and has Swelling Potential Very High and mineral content Kuarsa (Quartz). In general, 5% - 15% cements shows number optimum of decrement Plastisitas Index (PI). While 3% - 7% fly ash can increase value Plastisitas Index(PI). Decrement and addition Plastisitas Index (PI) be an transformation indicator of strength from soil Clay Anorganic (CH). Addition of 13%semen curing of 28 days value Unconfined Compressive Strength (UCS) optimal that is = 12,59 Kg/Cm2. For Soil Bolok (Island Timor) be type Sand good gradation (SW), soil sands type (A-1-b) with content mineral calcite. Addition cement 10 % can increase value UCS so reaching optimal value 21,87 kg/cm2 at the curing of 28 days.
Hubungan Antara Variasi Tarif Tol dengan Pendapatan dan Tingkat Pelayanan Hermawan, Rudy; Frazila, Russ Bona; Awang, Aranda; Jihanny, Jongga
Jurnal Teknik Sipil Vol 20, No 1 (2013)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak. Tol dikenakan karena adanya penghematan biaya operasi kendaraan dan waktu, kenyamanan serta fasilitas yang lebih baik, sehingga penetapan besarnya tarif tol harus memenuhi asas keuntungan atau manfaat bagi pengguna. Meningkatnya jumlah pengguna jalan dan pertumbuhan ekonomi, menyebabkan terjadinya kemacetan di ruasruas jalan tol, terutama saat jam puncak. Untuk itu diperlukan pertimbangan penentuan variasi tarif tol terkait dengan waktu penggunaannya untuk memberikan insentif dan disinsentif pemakaian jalan tol agar bisa terdistribusi sehingga tidak membuat kemacetan pada saat atau waktu tertentu. Kajian ini dilakukan untuk mengetahui pengaruh variasi tarif tol apabila diberlakukan serta elastisitasnya. Sebagai studi kasus, kajian dilakukan di Jalan Tol Dalam Kota Jakarta (Jakarta Intra Urban Toll) dan Jalan Tol Lingkar Luar Jakarta (Jakarta Outer Ring Road). Pada kajian ini dilakukan survey Stated Preference, dan dilakukan beberapa simulasi arus lalu  lintas serta pendapatan operator jalan tol dan jaringan jalan dengan software SATURN. Hasil kajian menunjukkan bahwa kenaikan tarif tol pada jam sibuk akan mengurangi volume lalu lintas jalan tol dan pendapatan. Namun, efek kenaikan harga tidak mengubah nilai Volume Capacity Ratio (VCR) dan Tingkat Pelayanan secara signifikan dikarenakan nilai waktu serta kebutuhan transportasi yang tinggi dan kapasitas jalan yang terbatas. Abstract. Toll is charged due to saving invehicle operating costs and time, comfort and better facilities, hence the amount of toll rates must satisfy the principle of profit or benefit to users. The increasing numbers of road users and economy growth lead to congestion at toll road sections, especially during peak hours. Thereforetoll rates variation associated with using time to provide incentives and disincentives in order to distribute toll road’s use to prevent congestion occur at a specific time should be taken into consideration. This study was conducted to determine the effect of toll ratesvariationupon its application and its elasticity. Jakarta Intra Urban Toll (JIUT) and the Jakarta Outer Ring Road (JORR) were used as models. A Stated Preferencesurvey, and some simulation of traffic flow and toll roads operator’s income and road networks using SATURN software were undertaken. This study showed that the increase in toll rates during peak hours would reduce the volume of highway traffic. However, the effect of increasing toll rates did not significantly change the value of Volume to Capacity Ratio (VCR), hence the Level of Service (LOS),due to time value, high transportation needs and limited road capacity.
A Morphological and Molecular Study of Phallus multicolor in Indonesia Hermawan, Rudy; Putra, Ivan Permana; Amelya, Mega Putri; Gunawan, Mochammad Rizky Wangsadireja
Makara Journal of Science Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

Phallus is known as stinkhorn mushroom. Previous reports have shown that this genus is recognized by the size and color of the basidioma, which is a highly plastic morphological character that can potentially lead to misidentification. In Indonesia, no study has combined morphological and molecular analyses to identify Phallus. This study aimed to determine the identity of Phallus that has the orange color of an indusium found in Bekasi, West Java, Indonesia. The morphological characteristics were described by observing the macroscopic and microscopic features of fresh specimens. Molecular analyses were performed based on the internal transcribed spacer 4/5 region sequence. The results showed that specimen BO24430 was identified as Phallus multicolor with 100% similarity in the BLAST results and a 98% bootstrap value on the phylogenetic tree. This taxonomic placement was supported by morphological features, such as a campanulate pileus, yellowish to white pseudostipe, brown to whitish eggs, and ellipsoid spores. This study is the only record of P. multicolor in Indonesia with a herbarium voucher since Boedijn in 1932. In addition, the current study assessed the diversity of Phallus in Indonesia using morphological and molecular evidence.
Newly Recorded Panus lecomtei (Fr.) Corner (Basidiomycota: Panaceae) for Indonesia Putra, Ivan Permana; Hermawan, Rudy; Salman, Ali Bin Abithalib
Makara Journal of Science Vol. 27, No. 3
Publisher : UI Scholars Hub

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Abstract

Panus lecomtei (Polyporales) is reported for the first time from Indonesia at the IPB University Campus Forest (IPBUCF). This species has similar macroscopic features to P. strigellus and P. neostrigosus. This study aimed to confirm the taxonomic position of P. lecomtei found at IPBUCF based on morphological and molecular evidence. The specimens were described by their macroscopic and microscopic characteristics. A phylogenetic approach was used with the internal transcribed spacer 1/2 sequence data. The combination of morphological and molecular analyses confirmed the taxonomic position of our specimens as P. lecomtei. The recorded species was distinguished by gregarious basidiomata, an infundibuliform resembling a funnel, violet during the immature stage to orangish brown in the mature pileus and ellipsoid basidiospore stages. Our specimens were distinguished from P. strigellus by having smaller basidiospores. It was difficult to separate P. lecomtei BO24428 from P. neostrigosus based on morphological characters. However, the BLAST results showed that specimen BO24428 had 99.56% similarity with P. lecomtei. In addition, our phylogenetic tree nested P. lecomtei BO24428 in the P. lecomtei clade. Morphological illustrations and a phylogenetic tree of P. lecomtei are provided. We suggest combining the morphological and molecular evidence in future studies of P. lecomtei from Indonesia
PENGAKUAN DAN HAK ASUH ANAK LUAR KAWIN (Studi Penetapan No. 456/Pdt.P/2020/PN Jkt.Pst) Hermawan, Rudy; Heriyani, Endang
JISIP: Jurnal Ilmu Sosial dan Pendidikan Vol 7, No 1 (2023): JISIP (Jurnal Ilmu Sosial dan Pendidikan) (Januari)
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Mandala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58258/jisip.v7i1.4511

Abstract

Children out of wedlock only have a civil relationship with their mother and their mother's family. To create a civil relationship with a child out of wedlock, the biological father must confess. In practice the biological father can admit it by submitting an application to the District Court. This can be seen in the determination of No. 456/Pdt/P/2020/PN Jkt Pst. The  problem posed is  how the judge's considerationin   granting the  application   for  recognition of biological fathers to illegitimate children in the determination of Number 456/Pdt.P/2020/PN.Jkt.Pst and the factors that cause extramarital custody rights are in  the biological father?. This type of research is normative legal research. Analysis of research data was carried out using a qualitative descriptive method. The results of this study indicate that the judge's consideration in granting the application for acknowledgment of children out of wedlock is because biological fathers want to have legal standing as a father in meeting all the needs of children which are then stated in a Statement of Recognition, and the factors that cause custody of children out of  wedlock goes to the biological father, because the biological father has shown his responsibilities as a father, by paying for childbirth when a child is born out of wedlock, and is able to finance an illegitimate child to adulthood, and the mother of an illegitimate child has handed over custody of the child to the biological father as outlined in the Deed of Agreement on Rights. Parenting made in front of a Notary. 
First Report on Wild Occurrences of Phoenix Mushroom (Pleurotus pulmonarius Fr. Quél.) in Indonesia Putra, Ivan Permana; Nurhayat, Oktan Dwi; Sibero, Mada Triandala; Hermawan, Rudy
Journal of Tropical Biodiversity and Biotechnology Vol 9, No 1 (2024): March
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtbb.86455

Abstract

The genus Pleurotus is known as a commercially important mushroom and one of the most well-known cultivated mushrooms worldwide. Of many species of Pleurotus, the phoenix mushroom (P. pulmonarius) is cultivated in many countries, including Indonesia. In Indonesia, the farmers and larger companies usually use commercial strains of phoenix mushroom which they purchased from other countries. To date, there was no prior information regarding wild occurrences of P. pulmonarius in Indonesia. During our regular mushroom hunting in Sukabumi, West Java, Indonesia, some edible wild fruiting bodies of light brown Pleurotus were collected. The current study aimed to determine the taxonomical position of our specimens based on morphological and molecular evidence. The combination of morphological and molecular analysis confirmed our specimens as P. pulnonarius. Morphologically, our specimens were distinguished by the small to medium sized fruiting bodies, pileus light brown, pinkish brown, to pale brown, flabelliform in the beginning to expanding broadly ovoid in maturity, lamellae shortly to deeply decurrent, stipe fleshy, eccentric to lateral, concolorous with lamellae, Basidiospores cylindrical to ellipsoid, basidia clavate to club shaped, basidioles are abundant, oleiferous hyphae common. The BLAST result revealed that our specimens posed a high similarity to P. pulnonarius from several countries as the top hits. The ITS phylogenetic tree placed Pleurotus FIPIA-DEP51 in the same clade of P. pulnonarius with 100% BS value. This study reports for the first time the wild occurences of P. pulmonarius in Indonesia. Future study should be done to characterize the cultures of reported mushroom which can potentially be the local strain for cultivation of P. pulmonarius industry in Indonesia. 
The Unpopular Edible Bolete (Phlebopus portentosus) in Indonesia Putra, Ivan Permana; Nurhayat, Oktan Dwi; Sibero, Mada Triandala; Hermawan, Rudy; Kristanto, Michael Aditya
HAYATI Journal of Biosciences Vol. 31 No. 4 (2024): July 2024
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.31.4.663-670

Abstract

Phlebopus portentosus (Berk. and Broome) Boedijn was firstly constructed from the collection of Indonesia in 1951. To date, the subsequent collection of this ectomycorrhizal (ECM) fungi has not been done in Indonesia. In addition, the utilization information of this edible mushroom as food is not popular for the country. The goal of our work was to update the current collection, provide the morphological and molecular data, and promote the utilization of this edible mushroom in Indonesia. Fresh fruiting bodies were evaluated for morphological and molecular evidence. The basidiomata were analysis on the basis of the morphological and molecular evidence. The phylogenetic tree was constructed following the rDNA-ITS 1/2 sequence. P. portentosus was verified by morphological and phylogenetic studies combined. The indigenous people in the research site use this wild edible mushroom for self-consumption and sell it to local market. Phlebopus portentosus BO24626 was solitary to connate, boletoid basidioma, yellowish to greenish brown pileus and stipe, yellowish hymenophore, clavate stipe, club shaped basidia, oval to subglobose basidiospores, cystidia present. The absence of sponge-like tissues and the occurrence of sterigmata distinguished our specimens from the similar morphological species P. spongious. The lack of reddish stipe distinguished our specimen from P. roseus. In addition, the presence of hymenial cystidia delimits our specimens from P. colossus. The inferred phylogenetic tree nested our specimen in the group of P. portentosus (sister to P. spongiosus). The ITS sequence of our specimen is now deposited at GenBank and can be applied to upcoming research of P. portentosus.
Calvatia rugosa: Epigeous Puffball Mushroom Reported from West Java Hermawan, Rudy; Putra, Ivan Permana
Science Education and Application Journal Vol 3 No 1 (2021): Science Education and Application Journal
Publisher : Program Studi Pendidikan IPA, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/seaj.v3i1.331

Abstract

Calvatia is known as one of epigeous puffball. It is classified in Basidiomycota division and Lycoperdaceae Family. This research aimed to characterize the Calvatia species based on morphological data. Fruiting bodies of Calvatia were grown on the grass with single colony and sometimes gregarious manner.Fruiting bodies of Calvatia were collected, observed, and preserved using FAA. Fruiting bodies were collected for immature and mature stages.The particular Calvatia  looked like pear-shaped or puffball-shaped and cream to brownish outside. The basidiospores are produced in a gasterothecium. The immature fruiting body has the brown to yellow gasterothecium. The mature fruiting body has the yellow to brown colour. The gasterothecium bore the basidiospore like a dust. Basidiospore is finely globose and free of ornament. The specimen was identified as Calvatia rugosa.
Pemberdayaan Masyarakat Nelayan Perempuan Dalam Pengelolaan Ikan di Pesisir Paciran Lamongan Hermawan, Rudy; Sunarya, Aris; Roekminiati, Sri; Pramono, Sapto
Majalah Ilmiah "CAHAYA ILMU" Vol 6 No 2 (2024): MAJALAH ILMIAH CAHAYA ILMU
Publisher : STIA Pembangunan Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37849/mici.v6i2.416

Abstract

Penelitian ini membahas pemberdayaan nelayan perempuan di Pesisir Paciran, Lamongan, yang menghadapi berbagai hambatan dalam pengelolaan ikan, seperti keterbatasan akses teknologi, modal, pelatihan, serta ketergantungan pada pihak ketiga dalam pengolahan dan pemasaran. Pemberdayaan masyarakat adalah komponen penting dalam mewujudkan kemandirian ekonomi dan meningkatkan kualitas hidup komunitas. Namun, hambatan-hambatan tersebut menghalangi peningkatan kualitas produk, perluasan pasar, dan kemandirian ekonomi nelayan perempuan. Mengacu pada pentingnya peran nelayan perempuan dalam ekonomi keluarga, penelitian ini bertujuan mengidentifikasi hambatan-hambatan yang ada dan memberikan rekomendasi strategis untuk mengatasinya, serta meningkatkan efektivitas program pemberdayaan yang telah berjalan. Metode kualitatif dengan melalui wawancara mendalam, observasi partisipatif, dan analisis dokumen. Informan utama meliputi nelayan perempuan, anggota komunitas lokal, serta perwakilan lembaga pemerintah dan LSM yang terlibat. Data dianalisis tematik untuk memahami pola, tantangan, dan peluang dalam pemberdayaan nelayan perempuan. Pendekatan ini membantu mengevaluasi sejauh mana program pemberdayaan yang ada telah memberikan dampak positif. Hasil penelitian menunjukkan adanya keberhasilan dalam peningkatan pengetahuan dan keterampilan nelayan perempuan. Namun, tantangan signifikan seperti keterbatasan teknologi, pelatihan, modal, dan ketergantungan pada pihak ketiga masih menghalangi pencapaian kemandirian ekonomi. Kesimpulannya, meskipun program pemberdayaan telah membawa perubahan positif, diperlukan peningkatan dalam implementasi dan dukungan yang lebih terfokus.
Characteristics of Wild Edible Mushroom Knowledge of Mushroom Foragers in Indonesia Sihotang, Saipul; Hermawan, Rudy; Putra, Ivan Permana
Jurnal Ilmu Pertanian Indonesia Vol. 30 No. 2 (2025): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18343/jipi.30.2.368

Abstract

Edible wild mushrooms (EWM) are food sources which have high nutritional value. Although they are not the main choice of daily foods in Indonesia, various local communities and mushroom foragers have been consuming EWM for decades, yet without proper documentation. This study aimed to preserve the knowledge of EWM consumption to increase the popularity and public awareness of EWM as alternative food in Indonesia. Data was collected via a structural survey to 50 mushroom hobbyists with range of 18-50 years old and representing several ethnic groups in Indonesia: Javanese, Malay, Sundanese, Banten, and Bugis. Most of the respondents have consumed EWM for more than 5 years, with a frequency of consuming more than once per month, and the knowledge of foraging was obtained from their families. The edible mushrooms were collected mostly after every January and usually consumed by themselves. The location for mushroom seeking and species of EWM mostly were the forests around residence area and Termitomyces spp. (local names: ‘jamur barat’, ‘jamur bulan’, ‘jamur rayap’, ‘jamur trucuk’, ‘jamur sempagi’, respectively). The taste of mushroom was the main reason for forage activity among the hobbyists. They generally consumed all parts of basidiomata and preferred the soft texture of fruiting body. The soup dish was the most preferred by foragers, in contrast to fried cooking type. Most of them distinguish EWM from poisonous mushrooms by observing certain structures basidiomata, however, cases of wild mushroom poisoning have occurred among foragers with low occurrence of frequency. Keywords: Indonesia; edible wild mushrooms; characteristics; mushroom foragers
Co-Authors Alfonsus Theodorus, Alfonsus Amalia, Tryanisa Ridla Amelya, Mega Putri Aranda Awang, Aranda Bambang Sugeng Endang Heriyani, Endang Fusvita, Laifa Gunawan, Mochammad Rizky Wangsadireja Ilyas Suratman Indra Maulana, Indra Ivan Permana Putra Jongga Jihanny, Jongga Kristanto, Michael Aditya Mulya, Sari Nugraha, Naufal Hafizh Nurhayat, Oktan Dwi Pramono, Sapto Roekminiati, Sri Russ Bona Frazila Saipul Sihotang Salman, Ali Bin Abithalib Sibero, Mada Triandala Sunarya, Aris YULIANA, META