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All Journal Bumi Lestari Naturalis : Jurnal Penelitian Pengelolaan Sumberdaya Alam dan Lingkungan Jurnal Agroindustri EnviroScienteae PENDIPA Journal of Science Education Molekul: Jurnal Ilmiah Kimia Jurnal Ilmu Kehutanan

Ridwan Yahya

Universitas Bengkulu

Author-ID : 3327935

Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Mathematics

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STATUS KEBERLANJUTAN PENYADAPAN GETAH POHON PINUS DI DESA BAYUNG KECAMATAN SEBERANG MUSI KABUPATEN KEPAHIANG Insan, Cahyadi; Susatya, Agus; Yahya, Ridwan
Naturalis: Jurnal Penelitian Pengelolaan Sumber Daya Alam dan Lingkungan Vol 10, No 2 (2021)
Publisher : Badan Penerbitan Fakultas Pertanian (BPFP), Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/naturalis.10.2.20406

PEMANFAATAN CABANG DENGAN KULIT KAYU SENGON (PARASERIANTHES FALCATARIA L. NIELSEN) SEBAGAI BAHAN BAKU PULP DALAM UPAYA MENGURANGI KERUSAKAN HUTAN Ridwan Yahya
Bumi Lestari Journal of Environment Vol 10 No 1 (2010)
Publisher : Environmental Research Center (PPLH) of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Based on preliminary researches, stem and branchwood of Paraserianthes falcataria L. Nielsen were suitable as raw material for pulp and paper manufacture. For the whole tree the highest proportion of bark was found in branches and the top of the tree with a value ranging 20 â€“ 35%. Up to now, the pulp industries have spent money to remove bark of P. falcataria branch before pulping. The objective of this study was to know the suitability of branches including bark as raw material for pulp and paper manufacture. Samples were determined for fiber dimension and its derivation. Screened chips were cooked with the Kraft process. Liquor-to-wood-ratio was 4 : 1. Chemical charge was 13.3% NaOH and 6.7% Na2S. The temperature was raised from room temperature to 170 oC for 90 min and kept at this temperature for 90 min. Pulp was washed; then kappa number, screened and rejected pulp, residual of black liquor were determined. Research results showed that pulp branchwood with bark has the values of screened pulp yield, alkali consumption, and kappa number 46.91%; 9,57; and 25.63, respectively. It paper product has the values of breaking length, burst factor, stretch, tensile strength, and opacity 9.94; 83.80; 3.57%; 1,733.34; 6.33 kN/m, and 92.85%, respectively. Based on those results, paper from branchwood with bark meets requirement for book, mimeograph, and photocopy papers.

YIELDS AND CHARACTERISTICS OF BINTANGUR OIL FROM ENGGANO ISLAND AS RAW MATERIAL FOR MAKING BIODIESEL Devi Silsia; Ridwan Yahya
Jurnal Agroindustri Vol 9, No 1 (2019)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.9.1.1-7

The potential and dominance of the Bintangur Tree on Enggano Island is quite large. Bintangur seed has a high oil content, and is not included in the food category. Bintangur oil is one of the vegetable oils that has the potential as a biodiesel feedstock. This study aims to determine the yield of Bintangur seed oil and the characteristics of crude oil produced. Bintangur seeds are obtained from the villages of Banjar Sari, Kaana and Apoho Enggano. Bintangur oil was extracted with n-hexane solution using soxlet. The oil characteristics observed included water content, density and free fatty acid content (FFA). The extraction results in the form of yellow oil with the yield of oil obtained ranged from 48.07 - 73.71%. Characteristics of crude oil produced has water content of 1.2 - 2%, density 0.910 - 0.920 and FFA 15.51 - 17.97%

PEMBUATAN ARANG DENGAN METODE TUNGKU PILORIS DOUBLE BURNER MENGGUNAKAN LIMBAH KAYU DENGAN METODE MANDUK DI KECAMATAN TEBING TINGGI KABUPATEN EMPAT LAWANG Jalin Elsaprike; Ridwan Yahya; Yuwana Yuwana
Naturalis: Jurnal Penelitian Pengelolaan Sumber Daya Alam dan Lingkungan Vol. 7 No. 2 (2018)
Publisher : Badan Penerbitan Fakultas Pertanian (BPFP), Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/naturalis.7.2.6009

Pemanfaatan limbah kayu hasil manduk menjadi arang di Kecamatan Tebing Tinggi, Kabupaten Empat Lawang dengan metode tungku pirolis double burner dihasilkan nilai kalor sebesar 7371,7 Kcal/kg, kadar air sebesar 4,7%, kadar abu sebesar 1,657%, kadar zat terbang sebesar 19,87% dan kadar karbon terikat sebesar 73,77%. Sedangkan dengan metode brick kiln diperoleh nilai kalor sebesar 7222,3 Kcal/kg, kadar air sebesar 5,7%, kadar abu sebesar 1,870%, kadar zat terbang sebesar 28,96 % dan kadar karbon terikat sebesar 64,19%. Hasil uji statistik menunjukan bahwa untuk nilai kalor dan nilai karbon terikat yang dihasilkan dengan metode tungku pirolis double burner signifikan lebih tinggi daripada metode brick kiln, tetapi nilai kadar air, nilai zat terbang dan kadar abunya signifikan lebih rendah. Nilai kalor, kadar air, kadar abu dan kadar karbon terikat yang dihasilkan melalui kedua metode telah memenuhi persyaratan SNI Arang Kayu 01-6235-2000 tetapi nilai kadar karbon terikat belum memenuhi persyaratan tersebut, sehingga dari kedua metode yang digunakan terdapat perbedaan nyata untuk nilai kalor, nilai kadar zat terbang dan nilai karbon terikat. Namun tidak demikian halnya dengan nilai kadar air dan kadar abu dimana nilai tersebut tidak menunjukan perbedaan nyata. Dari hasil uji perbandingan tersebut untuk nilai kalor, nilai kadar air, nilai kadar zat terbang, dan nilai karbon terikat telah memenuhi standart SNI 01/6235/2000, kecuali nilai kadar zat-zat terbang.Kata Kunci: Limbah Kayu, Manduk, Kualitas Arang, Tungku Pirolis Double Burner Dan Tungku Brick Kiln

Analisis kadar komponen kimia pelepah sawit varietas dura sebagai bahan baku pulp yang diterapkan pada pembelajaran kimia Sri Astuti; Ridwan Yahya; Agus Sundaryono
PendIPA Journal of Science Education Vol 2, No 1 (2018): February
Publisher : University of Bengkulu

ABSTRAK Penelitian ini bertujuan untuk menentukan kadar komponen kimia yang meliputi zat ekstraktif, lignin, holoselulosa dan ?-selulosa pelepah sawit varietas dura, menjelaskan pengaruh bagian pelepah sawit varietas dura terhadap kadar ekstraktif, lignin, holoselulosa dan ?-selulosa, membandingkan perbedaan kadar komponen kimia antar bagian pangkal, tengah dan ujung dari pelepah sawit varietas dura, mengindentifikasi gugus fungsi yang ada pada sampel (lignin, holoselulosa dan ?-selulosa) dengan menggunakan metode spektroskopi FTIR, membandingkan pengaruh perbedaan hasil belajar sebelum dan sesudah diberi pengembangan konsep makromolekul dengan melihat video yang diaplikasikan pada Lembar Kerja Peserta Didik (LKPD) terhadap cara berfikir kritis siswa Olimpiade Kimia. Zat ekstraktif, holoselulosa, ?- selulosa dan lignin dianalisis dengan menggunakan Tappi Test methode :204, T 203, T:222 serta diidentifikasi dengan spektroskopi FTIR. Hasil penelitian Kadar komponen kimia pada pelepah sawit varietas dura menurut bagiannya dari pangkal, tengah, ujung berturut-turut dengan rerata untuk kadar zat ekstraktif 8,92%, 7,80% , 7,23%. Lignin 24,89 %, 26,87 %, 24,17 %. Holoselulosa 84,11 %, 83,47 %, 82,24% dan ?- selulosa 45,76 %, 45,76 %, 45,54%. Penelitian pendidikan dengan desain one-group pretes-postes. Penelitian pendidikan dilakukan dengan melakukan proses pembelajaran menggunakan Video dan LKPD sesuai dengan keterampilan berpikir kritis. Pada implementasi dalam pembelajaran terdapat perbedaan pada hasil belajar kimia sebelum dan sesudah proses pembelajaran menggunakan video dan LKPD. Rata-rata nilai pretest 42,25 sedangkan rata-rata postest sebesar 83,50 dan terdapat peningkatan hasil belajar setelah dilakukan proses pembelajaran menggunakan Video dan LKPD secara signifikan sebesar 41.25. Kata kunci: zat ekstraktif; holoselulosa; selulosa; lignin; LKPD.

STUDI KOMPONEN KIMIA PELEPAH SAWIT VARIETAS TENERA DAN PENGEMBANGANNYA SEBAGAI MODUL PEMBELAJARAN KIMIA Arpinaini Arpinaini; Sumpono Sumpono; Ridwan Yahya
PendIPA Journal of Science Education Vol 1, No 1 (2017): october
Publisher : University of Bengkulu

This study aims to (1) determine the levels of the components of the Tenera variety of palm oil compounds including extractives, holocellulose, ? - cellulose, and lignin. (2) Analyze the utilization of the pulp of Tenera varieties as pulp raw materials based on their chemical components; (3) application of chemistry learning module to improving student learning outcomes. Determination of extractive substance content with TAPPI test methods Q: 204; lignin content T: 222; holocellulose Q: 9 levels and ?-cellulose content with TAPPI test methods T: 204. then lignin, holocellulose and ?-cellulose produced from the procedure were characterized by an IR spectrophotometer. The results of the study were module and implemented in ICHO students in SMAN 2 Kota Bengkulu. The data of the research results were analyzed by ANOVA test at 5% level. The results of the characterization of lignin, holocellulose and ?-cellulose with FTIR obtained a distinctive peak of the respective functional groups of the macromolecules. From the research also obtained the average value of chemical component content on the palm velvet varieties of tenera according to their part of base, middle, ends with mean for extractive substance 8.49%, 7,87%, 6,74%, lignin 20,7 %, 18.95%, 16.69%. holocellulose 81.57%, 80.33%, 79.24% and ?- cellulose 44.57%, 43.56%, 43.26%. Based on the results of the variance analysis, the difference in position (base, center, tip) on the palm oil of the tenera varieties on extractive, lignin, holocellulose and ?-cellulose substances has significant differences. Based on the chemical component classification of Indonesian wide wood leaf, sheep betera varieties of tenera in all three positions are used as pulp raw materials because they have moderate lignin content, high levels of Holocellulose and moderate levels of ?-cellulose. The result of module implementation in students there is a significant difference between pretest and posttest value. The use of modules in learning in science groups can improve student learning outcomes.

Pengembangan Modul Berbasis Penelitian Pencegahan P. berghei pada Mus musculus terhadap Berpikir Kritis Mahasiswa Maya Wahyunarti; Ridwan Yahya; Agus Sundaryono
PendIPA Journal of Science Education Vol 3, No 2 (2019): JUNE
Publisher : University of Bengkulu

Abstract[Module Development Based on P. berghei Prevention Research in Musculus on Student Critical Thinking]. This study aims to develop learning module based on the research of prevent the occurrence P. berghei bacterial infection and as well as to determine students' critical thinking skills against learning process by modules. This study is Research and Development with 4D design (define, design, development, and desimination). The results of the study found prevention of Plasmodium behergei infection from% inhibitors of erythrocytes at each dose. The dosage used in this study was a dose of 0.014 g / kgbb, 0.028 g / kgbb, 0.056 g / kgbb. The dose of 0.014 g / kg has an 9,24 % inhibitor, a dose of 0.028 g / kgbb has a 9.93% inhibitor, the dose of 0.056 g / kgbb has a 6.61% inhibitor. So the dose of 0.028 g / kgbb is the dose that most reduces the risk of P.berghei infection Mus musculus. In this study the critical thinking students of Semester 6 Chemistry University of Bengkulu classically are good category with a score of 63.13. This percentage is divided in some indicators, the indicator focus to the question is 67.92 value on the Critical criteria, considering the source can be trusted or not in the critically enough criteria with a value of 59.58, conclude by induction and consider the results of induction with a value of 64, 58 with critical criteria and identify assumptions of getting 63.13 values with critical criteria.Keyword: Module; J. Multifida; P. Berghei; Mus musculus; Critical Thinking.(Received November 19, 2018; Accepted April 15, 2019; Published June 18, 2019)AbstrakPenelitian ini bertujuan mengembangkan modul pembelajaran berbasis penelitian pencegahan infeksi Plasmodium berghei terhadap kemampuan berpikir kritis mahasiswa. Penelitian ini adalah penelitian Research and Development dengan desain penelitian 4D (define, design, development, and desimination). Hasil penelitian didapatkan pencegahan infeksi Plasmodium behergei dari % penghambat pada eritrosit pada setiap dosis. Dosis pada penelitian digunakan dosis 0,014 g/kgbb, 0,028 g/kgbb, 0,056 g/kgbb. Dosis 0,014 g/kgbb memiliki %penghambat 9,24 % , dosis 0,028 g/kgbb mimiliki %penghambat 9,93 %, dosis 0,056 g/kgbb memiliki %penghambat 6,61%. Jadi dosis 0,028 g/kgbb merupakan dosis yang paling mengurangi resiko terinfeksi P.bergehei pada mencit. Pada penelitian berpikir kritis mahasiswa pendidikan Kimia Semester 6 Universitas Bengkulu secara klasikal berada pada kategori baik dengan nilai 63,13. Persentase ini dibagi dalam beberapa indikator yakni indikator memfokuskan pertanyaan berada pada kriteria Kritis dengan nilai 67,92, mempertimbangkan apakah sumber dapat dipercaya atau tidak berada pada kriteria cukup kritis dengan nilai 59,58, menyimpulkan dengan cara induksi dan mempertimbangkan hasil induksi dengan nilai 64,58 dengan kriteria kritis dan mengidentifikasikan asumsi mendapatkan nilai 63,13 dengan kriteria kritis.Kata kunci: Modul; J. Multifida; P. Berghei; Mus musculus; Berpikir Kritis.

OPTIMASI BIOKRAFT JAMUR Phanerochaete chrysosporium TERHADAP KOMPONEN KIMIA CAMPURAN BATANG DAN LIMBAH CABANG MANGIUM SEBAGAI BAHAN BAKU PULP Devi Silsia; Ridwan Yahya; Mucharomah Mucharomah
Molekul Vol 5, No 2 (2010)
Publisher : Universitas Jenderal Soedirman

Optimation biokraft of fungi P. Chrysosporium through elongated incubation time on mixed stem and branch waste mangium is a solution to solve the environmental pollution problem, low quality of pulp and limited raw material. Effect of P. Chrysosporium 10 % concentration and 45 days incubation time on pre research could not decrease lignin optimally and exstractive degradation had not occured yet. The aims of the study were to observe the effect of incubation time extension, and to determine the best incubation time of P. Chrysosporium applied at 10 % concentration based on the chemical component percentage, 45, 60 and 75 days on mixed stem and branch as raw material for pulp. Results showed that increasing incubation time decreased extractive and lignin content and increased holocelulosa and alpha celulosa content. Mixed stem and branch with 10% amount and 75 day incubation time of P. Chrysosporium gave the best results for raw material of pulp.

KEBERLANJUTAN PENYADAPAN GETAH POHON PINUS DI DESA BAYUNG KECAMATAN SEBERANG MUSI, KABUPATEN KEPAHIANG, BENGKULU Cahyadi Insan; Agus Susatya; Ridwan Yahya
EnviroScienteae Vol 17, No 1 (2021): ENVIROSCIENTEAE VOLUME 17 NOMOR 1, APRIL 2021
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/es.v17i1.11347

Sustainability in managing natural resources depends on the availability of current and future resources within management schemes. Tapping Pine trees for resin production have long been practiced in Bukit Daun Protection Forest, Kepahiang, Bengkulu, despite Bengkulu has not been known as a main province producing pine’s resin. Therefore, it was worthily to examine the sustainability of managing pine stand for production of pine’s resin at Bayung, Seberang Musi, Kepahiang, Bengkulu. The research was carried out with Multi Dimensional Scaling (MDS) approach and using Rapid Appraisal for Tapping Pine Trees (RP-TPT) software. It was constructed by ecologiy, economy, Social and culture, law dan institution, and technology and infrastructure dimensions. Ten attributes were assigned to each dimension. The result indicated that the managing pine stand was moderately sustainable (57.66). All dimensions were categorized into moderately sustainable, except to technology and infrastructure dimension (48.15), which was classified as poorly sustainable. Among 50 attributes, sixteen attributes were grouped as sensitive, meaning they are strongly influential to the sustainability to pine’s resin production. Sustainability could be increased by management intervention, especially to the improvement of tapping’s kill attribute of the technology and infrasrtucture dimension. This management intervention should also be followed by the improvement of the other attributes.

Physical Damages of Wood Fiber in Acacia Mangium due to Biopulping Treatment Ridwan Yahya; Mucharromah Mucharromah; Devi Silsia; Septiana Septiana
Molekul Vol 11, No 1 (2016)
Publisher : Universitas Jenderal Soedirman

Biopulping is fungal pretreatment of wood chips to reduce unused chemical composition of material in pulping. Preliminary study showed that pretreatment of Phanerochaetachrysosporium to Acacia mangium Willd can reduce lignin and improve holocellulose and cellulose content of the material. Fiber dimension recognized as other important factor for paper properties. The question is how the integrity and dimensions of the wood fiber that has been pretreated with the fungus. The objectives of present study were to know effect of pretreatment of P. chrysosporium to the integrity and dimensions of the fiber. The P. chrysosporium was cultured for 14 days in growth medium, and inoculated to wood chips 5% (w/v) and incubated for 0, 15 and 30 days. The inoculated wood chips were chipped into 1 mm x 1 mm x 20 mm and macerated using franklin solution at 60 oC for 48 hours. Forty fibers from each incubated time were analized their physical damages using a light microscope at a 400 magnification. The inoculated fibers were measured theirs dimensions. The physical damage percentage of fibers pretreated using P. chrysosporium was 0%. Length and wall thickness of the pretreated fibers were can be categorized as middle class and thin fibers, respectively.

Co-Authors AGUS SUSATYA Arpinaini Arpinaini Budiyanto Budiyanto Cahyadi Insan Devi Silsia Devi Silsia Devi Silsia Insan, Cahyadi Jalin Elsaprike Jerry Antonio Maya Wahyunarti Mucharomah Mucharomah Mucharromah Mucharromah Mucharromah Mucharromah Septiana Septiana Sri Astuti Sumpono Sumpono Yuwana Yuwana

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