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All Journal Jurnal Rekayasa Proses Agrointek Jurnal Belantara Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Rekayasa Proses Jurnal Kreativitas PKM Gorontalo Journal of Forestry Research Jurnal Ilmu dan Teknologi Kayu Tropis PERENNIAL Journal of Sylva Indonesiana ULIN: Jurnal Hutan Tropis Jurnal Hutan Pulau-Pulau Kecil : Jurnal Ilmu-Ilmu Kehutanan dan Pertanian Jurnal Pengabdian Kepada Masyarakat (JPKM) Tabikpun Jurnal Sylva Lestari JURNAL HUTAN TROPIS JOURNAL OF PEOPLE, FOREST AND ENVIRONMENT Jurnal Pengabdian Fakultas Pertanian Universitas Lampung
Wahyu Hidayat
Jurusan Kehutanan, Fakultas Pertanian, Universitas Lampung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Medicine & Pharmacology Nursing Public Health Social Sciences

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Properties Enhancement of Rubber Wood Particleboard Laminated with Low Density Polyethylene (LDPE) Resin Fauzi Febrianto; See P Hwee; Ching K Man; Wahyu Hidayat
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 10, No 2 (2012): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (176.26 KB) | DOI: 10.51850/jitkt.v10i2.118

Abstract

The main weaknesses of particleboard are that it has a lower strength and a lower dimensional stability compared to solid wood. Therefore, in order to gain excellent properties prior to be used, it needs some treatments, i.e., resin thermoplastic laminated. The objectives of this study were to improve the physical and mechanical properties of rubber wood particleboard laminated with low density ethylene (LDPE) resin. Rubber wood particleboard was laminated with 4 different concentrations of LDPE resins (i.e., 5, 10, 15, and 20%). The physical and mechanical properties of board were evaluated both in dry and wet states. The results indicated that the dimensional stability of board after laminated with LDPE resin showed significant improvement in term of water absorption and thickness swelling. Modulus of rupture and srew resistant of resulted particle board were increased with addition of LDPE resin. Modulus of elasticity and surface hardness of the particleboard were slightly decreased with addition of LDPE resin. The intenal bond was unchanged. The best treatment was found on lamination the surface of particleboard with 5% LDPE resin. All the physical and mechanical properties of particleboard laminated with 5% LDPE resin met the requirements of JIS A 5908-2003 standard.Key words: dimensional stabilization, low density polyethylene, mechanical properties, particleboard
Sifat Fisis dan Mekanis Oriented Strand Board Hibrida Bambu Pada Berbagai Shelling Ratio (Physical and Mechanical Properties of Hybrid Bamboo Oriented Strand Board at Various Shelling Ratios) Rynaldo Davinsy; Sena Maulana; Muhammad I Maulana; Elvara D Satria; Deded S Nawawi; Rita K Sari; Wahyu Hidayat; Fauzi Febrianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 17, No 2 (2019): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/jitkt.v17i2.473

Abstract

Hybrid Bamboo Oriented Strand Boards (OSB) were produced to improve bamboo OSB's physical and mechanical properties. Shelling ratio adjustment of the strand type combination could determine the optimal physical and mechanical properties of hybrid bamboo oriented strand boards (OSB). The purpose of this study was to evaluate the physical and mechanical properties of hybrid betung and andong bamboos OSB at various shelling ratios. Steam modified strands of betung and andong bamboo were used as an outer layer and core layer, respectively. Hybrid bamboo OSBs were prepared with 0.7 g cm-3 target density and 8% phenol-formaldehyde resin content. Three layers of OSB were made with outer: core shelling ratios of 30:70, 40:60, 50:50, and 60:40. The physical and mechanical properties of the OSB were tested referring to the JIS A 5908-2003 standard. The targeted board density was achieved and the physical properties of all hybrid bamboo OSB have met the requirement of CSA O437.0 (Grade O-1) standard criteria. The parallel modulus of elasticity (MOE) and modulus of rupture (MOR) increased with increasing outer layer ratio. However, the perpendicular MOE and MOR decreased with increasing outer layer ratio. The internal bonding (IB) of the OSB with a shelling ratio of 30:70 and 40:60 met with the requirement of the CSA O437.0 (Grade O-1) standard.
Sifat Fisis dan Mekanis Papan Partikel Hibrida dari Kayu Cepat Tumbuh dan Bambu dengan Perlakuan Perendaman Panas ( Physical and Mechanical Properties of Hybrid Particleboard from Fast Growing Wood Species and Bamboo with Heat Immersion Treatment) Soleh Muhamad; Marwanto Marwanto; Muhammad I Maulana; Sena Maulana; Adesna Fatrawana; Wahyu Hidayat; Rita K Sari; Fauzi Febrianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 17, No 1 (2019): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (544.823 KB) | DOI: 10.51850/jitkt.v17i1.460

Abstract

The purpose of this study was to evaluate the physical and mechanical properties of hybrid particleboard made from combination of sengon wood (Falcataria moluccana), jabon wood (Anthocephalus cadamba), and betung bamboo (Dendrocalamus asper) with hot water immersion treatment. Pretreatment with hot water immersion was carried out in water bath at 80 ºC for 2 hours. The boards were made using urea formaldehyde (UF) adhesive with (30x30x0.9) cm3 size and 0.6 g cm-3 target density. Physical and mechanical properties of hybrid particleboards were evaluated based on JIS A 5908-2003 standard. The results showed that the combination treatment with bamboo particles can increase the mechanical properties and dimensional stability of the particleboards especially when combined with jabon particles. Hot water immersion treatment can improve the mechanical properties (MOE, MOR and IB) of hybrid particleboards. However, hot water immersion treatment decreased dimensional stability (thickness swelling and water absorption) of hybrid particleboards.
Effect of Wood Species and Layer Structure on Physical and Mechanical Properties of Strand Board wahyu Hidayat; Mohamad I Sya'bani; Handian Purwawangsa; Apri H Iswanto; Fauzi Febrianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 2 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (109.83 KB) | DOI: 10.51850/jitkt.v9i2.134

Abstract

The objectives of this research were to evaluate the effect of wood species and layer structure on physical and mechanical properties of strand board made from Paraserianthes falcataria, Maesopsis eminii and Acacia mangium woods collected from planted forest in Bogor district, Indonesia. The densities of P. falcataria, M. eminii and A. mangium woods were 0.36, 0.41 and 0.46 g cm-3, respectively. Three types of layer structures namely perpendicular, parallel, and random orientation were applied. Methylene diisocyanate (MDI) resin with 7% resin amount (w/w) was used. The physical and mechanical properties of strand board were evaluated based on CSA 0437.0 standard. The results indicated that strand board manufactured from wood with lower density (P. falcataria) had higher mechanical properties (modulus of rupture, modulus of elasticity and internal bond) and lower dimensional stability (water absorption and thickness swelling) compared to strand board manufactured from higher density (A. mangium), vice versa. Strand orientation strongly affected the physical and mechanical properties of board with perpendicular orientation showed superior performance as compared to parallel and random orientation. Physical and mechanical properties of oriented strand board (OSB) made from fast growing tree species met the requirement of CSA 0437.0 standard for grade O-1 OSB panels.Key words: layer structure, methylene diisocyanate resin, strand board, tropical wood species,
Peningkatan Kualitas Pelet Tandan Kosong Kelapa Sawit melalui Torefaksi Menggunakan Reaktor Counter-Flow Multi Baffle (COMB) Wahyu Hidayat; Irma Thya Rani; Tri Yulianto; Indra Gumay Febryano; Dewi Agustina Iryani; Udin Hasanudin; Sihyun Lee; Sangdo Kim; Jiho Yoo; Agus Haryanto
Jurnal Rekayasa Proses Vol 14, No 2 (2020)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.56817

Abstract

Oil palm (Elaeis guineensis) empty fruit bunches (EFB) have not been utilized optimally. Currently, it is considered as a resource with low economic value. This biomass can be converted into bioenergy through a torrefaction process. Torrefaction is a mild pyrolysis at temperatures ranging between 200 and 300 °C, and it is generally performed under an inert atmosphere. The objective of this study was to evaluate the effects of torrefaction using Counter-Flow Multi Baffle (COMB) on the properties of oil palm EFB pellets. Torrefaction was conducted at 280 °C temperature with a residence time of 4 minutes. The results showed a decrease in the equilibrium moisture content and an increase in hydrophobicity after torrefaction using the COMB reactor. The change in the hygroscopic property could make the oil palm EFB pellet more stable against chemical oxidation and microbial degradation, hence self-heating and auto-ignition during storage could be prevented. The heating value of biomass increased after torrefaction. Torrefaction with the COMB reactor resulted in a heating value of 17.90 MJ/kg, which is comparable with the results of oxidative torrefaction (with longer residence time) of 18.28 MJ/kg. The results suggested that torrefaction using the COMB reactor could provide a great improvement in the quality of the bioenergetic properties of oil palm EFB pellets. However, the high ash content of the EFB pellets implied that the EFB pellets suitable for a small-scale application, but not yet for cofiring in power plants or as a feedstock for gasification.Keywords: Counter-Flow Multi Baffle; oil palm empty fruit bunches; renewable; torrefactionA B S T R A KTandan kosong kelapa sawit (Elaeis guineensis) belum dimanfaatkan secara optimal. Saat ini bahan tersebut masih dianggap sebagai sumber daya bernilai ekonomi rendah. Tandan kosong kelapa sawit (TKKS) dapat dikonversi menjadi bioenergi melalui proses torefaksi. Torefaksi merupakan proses pirolisis ringan pada suhu berkisar antara 200 dan 300 °C dan umumnya dilakukan di bawah kondisi inert. Penelitian ini bertujuan untuk mengetahui pengaruh torefaksi dengan reaktor Counter-Flow Multi Baffle (COMB) terhadap sifat-sifat pelet TKKS. Torefaksi dilakukan pada suhu 280 °C dengan waktu tinggal 4 menit. Hasil penelitian menunjukkan bahwa torefaksi menyebabkan penurunan kadar air kesetimbangan dan menjadi hidrofobik setelah torefaksi dengan reaktor COMB. Perbaikan sifat higroskopis dapat membuat pelet TKKS lebih stabil terhadap oksidasi kimia dan degradasi mikroba, sehingga pemanasan sendiri dan pembakaran spontan selama penyimpanan dapat dicegah. Nilai kalor biomassa meningkat setelah torefaksi. Torefaksi dengan reaktor COMB menghasilkan nilai kalor 17,90 MJ/kg, yang sebanding dengan hasil torefaksi oksidatif dengan waktu tinggal lebih lama, sebesar 18,28 MJ/kg. Hasil penelitian menunjukkan bahwa torefaksi dengan reaktor COMB dapat meningkatkan kualitas energi pelet TKKS. Tetapi pelet TKKS masih memiliki kadar abu yang tinggi sehingga biomassa hasil torefaksi belum sesuai untuk cofiring di pembangkit listrik atau sebagai bahan baku untuk gasifikasi.Kata kunci: Counter-Flow Multi Baffle; tandan kosong kelapa sawit; terbarukan; torefaksi 
Effects of Torrefaction Temperature on the Characteristics of Betung (Dendrocalamus asper) Bamboo Pellets Bagus Saputra; Karina Gracia Agatha Tambunan; Intan Fajar Suri; Indra Gumay Febryano; Dian Iswandaru; Wahyu Hidayat
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 11, No 2 (2022): June
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v11i2.339-353

Abstract

The objective of this study was to evaluate the effects of torrefaction temperature on the physical and mechanical properties of betung bamboo (Dendrocalamus asper) pellets. Torrefaction was conducted in an electric furnace at 200°C, 240°C, and 280°C for 50 minutes. The physical properties evaluated included color change, density, moisture content, water resistance, and water adsorption. The mechanical properties were also investigated by compressive strength test. The result showed that torrefaction affected the color properties of betung bamboo pellets with ∆E values of more than 12 or totally changed. The density and moisture content of torrefaction bamboo betung pellets decreased with increasing torrefaction temperature. The results also showed that the hydrophobic properties of the bamboo betung pellets improved with the increased of torrefaction temperature. The highest compressive strength value was obtained by bamboo betung pellets torrefied at 200°C and the values decreased with the increase of temperature. In conclusion, there were differences in the physical and mechanical properties of bamboo betung pellets that were torrefied at different temperatures. Torrefaction with an electric furnace effectively improved the quality of betung bamboo pellets. Keywords:   Bamboo betung, pellets, temperature, torrefaction
Manajemen Penangkaran Lebah Madu (Apis Cerana Fabr.) di Desa Buana Sakti Kecamatan Batanghari Kabupaten Lampung Timur Apriyanita Pitri Ningrum; Rudi Hilmanto; Wahyu Hidayat
Jurnal Sylva Lestari Vol. 1 No. 1 (2013): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.515 KB) | DOI: 10.23960/jsl1123-28

Abstract

Honey forest are one of beekeeping product that can developed by honey bees breeding method.In order to remain sustainable production of honey breeding, agood breeding management is significantly needed. The purpose of this research was to identify and evaluate the breeding management of Apis cerana Fabr. honey bee based onthe indicator and parameter assessment of technical requirement planning, the technique, the implementation, and the products of breeding. This research was conducted from February 2012 until April 2012 in the Buana Sakti Village, District of Batanghari, East Lampung. The method used in this research is field observations and questionnairy interviews. The analysis applied in this reseacrh is quantitative and qualitative method, comparing the data collection from the field to the criteria and indicator of breeding management assessment. The results of this research showed that the aspect of technical requirement planning and the breeding products are considered good, it is because it has accomplished the requirement. While the aspect of breeding technique and implementation are considered not good, it is caused by the limited competence of bee farmer and the breeding methods. Overally, the breeding management of Apis cerana Fabr. honey bee in Buana Sakti village for all aspects is considered good. The breeding management of Apis cerana Fabr. honey bee in Buana Sakti village needs to be well improved, particularly in term of technique and implemetation of breeding to obtain the maximum quality of honey bee breeding. Keywords : Apis cerana Fabr., bee breeding management, bee conservation
Kontribusi Hutan Rakyat terhadap Pendapatan Petani di Desa Buana Sakti Kecamatan Batanghari Kabupaten Lampung Timur Lina Nur Aminah; Rommy Qurniati; Wahyu Hidayat
Jurnal Sylva Lestari Vol. 1 No. 1 (2013): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.569 KB) | DOI: 10.23960/jsl1147-54

Abstract

This study objective is to determine the contribution of private forest management on farmers total income. This study was conducted in March-May 2012 in the Buana Sakti Village, Sub District of Batanghari, District of Lampung Timur. The number of respondent of this study were 40 private forest farmers. Data were collected by direct field observation, interview, and literature review. Data were then analyzed using qualitative and quantitative analysis methods. The results revealed that the average area of private forest owned by farmers were 0,98 ha. The private forest were managed by monoculture, polyculture and agroforestry system. In monoculture system the farmers planted Acacia mangium, in polyculture system the farmers planted Acacia mangium and Hevea brasiliensis while in agroforesty system the farmers combine their land with Acacia mangium, with honey enterprises. The results showed that private forest contribute Rp 17.619.649 every year (70,54%) of the total farmers household income of Rp 24.984.774 every year. Keywords: contributions, farmers income, private forest
Analisis Finansial Pola Tanam Agroforestri di Desa Pesawaran Indah Kecamatan Padang Cermin Kabupaten Pesawaran Provinsi Lampung Nurpine Nadeak; Rommy Qurniati; Wahyu Hidayat
Jurnal Sylva Lestari Vol. 1 No. 1 (2013): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (489.221 KB) | DOI: 10.23960/jsl1165-74

Abstract

Agroforestry in Indonesian language simply means as planting trees on agricultural land. Land's management with sustainable agroforestry systems expected to be able improve field productivity. It has needed to do financial analysis for agroforestry cropping patterns. It based on some of dominant plant species in agroforestry cropping patterns. This study conducted in the Pesawaran Indah Village of Padang Cermin Subdistrict on Pesawaran District in March-May 2012. The study aims to determine a profitable agroforestry cropping patterns based on financial analysis. Sampling used by purposive sampling technique. Financial analysis of agroforestry cropping pattern used the NPV, BCR and IRR with feasibility age of 20 years and an interest rate of 12%.The results showed that there are 9 agroforestry cropping patterns applied. Analysis showed that agroforestry cropping patterns is financially viable to be applied. Among 9 cropping pattern, pattern VI which is combination of Cocoa, Coconut and Banana has the highest profit with NPV is Rp 71.392.802,34,-, BCR of 7,39 and an IRR of 96%. Key words : agroforestry, financial analysis, pattern
Potensi Kayu Rakyat dan Strategi Pengembangannya (Studi Kasus) di Hutan Rakyat Desa Buana Sakti Kecamatan Batanghari Kabupaten Lampung Timur Tri Putri Siadari; Rudi Hilmanto; Wahyu Hidayat
Jurnal Sylva Lestari Vol. 1 No. 1 (2013): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (164.103 KB) | DOI: 10.23960/jsl1175-84

Abstract

This study aims to determine the potential of timber from private forest and to analyze the strategy to develop the management of private forest in Buana Sakti.This research held at March-May 2012. Tree data and timber potency were collected by using measurement plot of 20x20m with sampling intensity of 1%.The datas were then analyzed quantitatively. SWOT analysis is performed to determine the proper development strategy of private forest in Buana Sakti. The results show that the potential of timber in private forest of Buana Sakti is 111,79 m3 which comprise of timber teak, rubber, randu, jengkol, sengon, sonokeling, acacia, waru, clove, melinjo with the potential revenue of Rp. 159.959.000/ha. The calculations show that the INP most dominant plant species are acacia that is equal to 88,18% with 51,88% of total KR, FR 28,95%, 7,35% DR. The development strategy of private forest that needed to be applied are selecting the best quality and provide education to farmers about the important of forest. Keywords: forestry, strategy development, wood forest products
Co-Authors Abimanyu, Bondan Adesna Fatrawana Adesna Fatrawana Aditya Rianjanu Afif Bintoro Agus Haryanto Agus Haryanto Agus Haryanto Agus Setiawan Ainin Niswati Ainin Niswati Ainin Niswati Alim Fadila Rahman Anis Ambarwati Anne Carolina Apri H Iswanto Apriyanita Pitri Ningrum Apriyanita Pitri Ningrum Astri Aulia Suwanda Bagus Saputra Bagus Saputra Bagus Saputra Bagus Saputra Bangun Adi Wijaya Bangun Adi Wijaya Bondan Abimanyu Byantara Darsan Purusatama Byung Bae Park Ching K Man Christine Wulandari Christine Wulandari Christine Wulandari Christine Wulandari Deded Sarip Nawawi Denni Prasetia Destia Novasari Dewi Agustina Iryani Dewi Agustina Iryani Dewi Agustina Iryani Dewi Agustina Iryani, Dewi Agustina Dian Iswandaru Dian Iswandaru Dini Lestari Donghyuk Chun Doni Hapsoro Duryat Duryat Duryat Duryat Elvara D Satria Eva Yunita Eva Yunita Fahriya Puspita Sari Faizatul FALAH Falah Rizkasumarta Fauzi Febrianto Fauzi Febrianto Febryanto, Indra Gumay Go Un Yang Gusri Akhyar Ibrahim Handian Purwawangsa Hari Kaskoyo Hari Kaskoyo Hendra Prasetia Hendra Prasetia Hendra Prasetia Hokyung Choi Hyuk Im Indra G Febryano Indra Gumay Febryano Intan F Suri Intan Fajar Suri Irma Thya Rani Irma Thya Rani Irma Thya Rani Irwan Sukri Banuwa Irwan Sukri Banuwa Ismayati, Maya Jacky Michael Pah Jiho Yoo Jiho Yoo Jiho Yoo Jong Ho Kim Kadek Wikan Nandini Karina Gracia Agatha Tambunan Karina Gracia Agatha Tambunan Laksana, Raden Permana Budi Lia Mulyana Lina Nur Aminah Lina Nur Aminah Lisman Suryanegara Lubis, Muhammad Adly Rahandi Mareli Talaumbanua Marwanto Marwanto Marwanto Maulana, Sena Melya Riniarti Mia Putri Utami Mia Putri Utami Mohamad I Sya'bani Muhammad Adly Rahandi Lubis Muhammad Adly Rahandi Lubis Muhammad Adly Rahandi Lubis Muhammad Aldo Kurniansyah Muhammad Alfaridzi Muhammad Iqbal Adi Baskara Muhammad Iqbal Maulana Naili Rahmah Nam Hun Kim Nam Hun Kim Nindya Triya Puspita Nissa Nurfajrin Solihat Nurpine Nadeak Nurpine Nadeak Oktarine Melly Aminah Harum Pangestu Prasetyo Park, Byung Dae Rafical Cahaya Utama Rahmat Safe’i Rahmi Adi Bazenet Rahmi Adi Bazenet Rahmi Adi Bazenet Rani, Irma Tya Rara Diantari Rasyidah Amany Repha Sera Yunita Rini Nurindarwati Rio Ardiansyah Murda Rio Ardiansyah Murda Rita K Sari Rita Kartika Sari Rommy Qurniati Rommy Qurniati Rubiyanti, Tri Rudi Hilmanto Rudi Hilmanto Rudi Hilmanto Rynaldo Davinsy Safe’i, Rahmat Samsul Bakri Samsul Bakri Sandi Asmara Sangdo Kim Sangdo Kim Sangdo Kim Sarah Augustina See P Hwee Seldi Prayoga Sena Maulana Seung Hwan Lee Shalehudin Denny Ma’ruf Sihyun Lee Sihyun Lee Sihyun Lee Silvia Uthari Nuzaverra Mayang Mangurai Siti Aisyah Siti Mutiara Ridjayanti Siti Mutiara Ridjayanti Sofiyan, Ade Soleh Muhamad Soleh Muhamad Soohyun Kim Sri Hidayati Sumaryo Gito Saputro Susni Herwanti Susni Herwanti Tarmizi Taher Tengku Muhammad Renzy Hariz Tri Maryono Tri Putri Siadari Tri Putri Siadari Tri Yulianto Tri Yulianto Udin Hasanudin Udin Hasanudin Udin Hasanudin Udin Hasanudin Udin Hasanudin Udin Hasanudin Udin Hasanudin Widya FATRIASARI Winarno, Gunardi Djoko Wisnu Satyajaya Yadav, Sumit Manohar Yazid Bindar Yogi Sulistio Yusuf Sudo Hadi Zaini, Lukmanul Hakim