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Pengaruh Komposisi Media Terhadap Produksi Konidia Jamur Entomopatogen Beauveria bassiana (Balsamo) Vuillemin Indrayani, I.G.A.A.; Prabowo, Heri
Buletin Tanaman Tembakau, Serat & Minyak Industri Vol 2, No 2 (2010): Oktober 2010
Publisher : Balai Penelitian Tanaman Pemanis dan Serat (Balittas)

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Penelitian pengaruh komposisisi media dan suhu terhadap produksi konidia Beauveria bassiana dilaksanakan di Laboratorium Patologi Serangga Balai Penelitian Tanaman Tembakau dan Serat, Malang mulai Mei sampai dengan November 2009. Tujuannya adalah untuk mengetahui pengaruh perbedaan komposisi media terha-dap produksi konidia B. bassiana. Perlakuan yang digunakan adalah: (1) beras, (2) jagung, (3) beras+glu-kosa, (4) beras+yeast, (5) jagung+glukosa, dan (6) jagung+yeast. Setiap perlakuan disusun dalam rancang-an acak lengkap (RAL) dengan enam kali ulangan. Parameter yang diamati adalah laju pertumbuhan dan produksi konidia. Hasil penelitian menunjukkan bahwa beras dan jagung berpotensi menjadi media tumbuh yang baik bagi jamur B. bassiana. Proses pembentukan konidia sudah dimulai pada 3 minggu setelah inoku-lasi, lebih cepat dibanding pada media jagung (4,5 minggu). Penambahan yeast lebih nyata meningkatkan produksi konidia B. bassiana pada beras maupun jagung dibanding dengan penambahan glukosa. Rata-rata produksi konidia pada komposisi media beras+yeast dapat mencapai > 4,0 x 109 konidia/g media dan lebih tinggi dibanding produksi konidia pada media lainnya (< 3,0 x 109 konidia/g media). Study on the effects of solid medium composition and temperature on conidia production of B. bassiana was conducted at Insect Pathology Laboratory of Indonesian Tobacco and Fiber Crops Institute (IToFCRI), Malang from May to November 2009. The objective of the study was to find out the effects of different me-dium composition. Treatments used were (1) whole rice, (2) broken maize, (3) whole rice+glucose, (4) whole rice+yeast, (5) broken maize+glucose, and (6) broken maize+yeast. Each treatment was arranged in randomized complete design (RCD) with six replications. Parameters observed were growth rate and conidial production of B. bassiana at room temperature. Results showed that whole rice and broken maize could be used as solid medium for B. bassiana. Conidia production was faster on most of medium based on whole rice than that on broken maize. On whole rice medium conidia of B. bassiana were produced about 10 days earlier than that on broken maize. Yeast and glucose addition into medium was able to speed up the fungi growth and to increase conidia production. Addition of yeast potentialy increased conidia production com-pared with other medium with glucose addition. Average production of conidia on whole rice+yeast was more than 4,0 x 109 conidia/g medium compared with any other medium composition that produced less than 3,0 x 109 conidia/g medium.
Keefektifan Nematoda Patogen Serangga Steinernema sp. Terhadap Achaea janata L., Serangga Pemakan Daun Jarak Kepyar (Ricinus communis) Prabowo, Heri; Indrayani, I.G.A.A.
Buletin Tanaman Tembakau, Serat & Minyak Industri Vol 5, No 2 (2013): Oktober 2013
Publisher : Balai Penelitian Tanaman Pemanis dan Serat (Balittas)

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Penggunaan pestisida kimia yang cukup tinggi pada akhir-akhir ini telah menimbulkan dampak negatif ter-hadap lingkungan, sehingga pengendalian hama yang ramah lingkungan sangat diperlukan. Saat ini, peng-gunaan nematoda entomopatogen terutama Steinernema sp., membuka peluang untuk digunakan sebagai pengendalian Achaea janata. Tujuan dari penelitian ini untuk mengetahui keefektifan Steinernema sp. ter-hadap A. Janata , dilaksanakan di laboratorium patologi serangga Balai Penelitan Tanaman Pemanis dan Serat pada bulan Maret sampai dengan Agustus 2011. Penelitian menggunakan rancanagan acak lengkap (RAL) dengan empat ulangan. Setiap ulangan menggunakan 25 larva A. janata instar 2. Larva diekspose de-ngan berbagai variasi konsentrasi Steinernema sp. dan kematian larva diamati setiap hari sampai 120 jam setelah infeksi. Konsentrasi Steinernema sp. yang digunakan adalah 0, 50, 100, 200, 300, dan 400 JI/larva. Hasil penelitian pemberian Steinernema sp. pada konsentrasi 200, 300, dan 400 JI/larva cukup efektif untuk membunuh A. janata dengan persentase berkisar antara 80–94% mulai 48–120 jam setelah perlakuan. Se-makin tinggi konsentrasi nematoda, semakin tinggi mortalitas A. janata. Steinernema sp. dengan konsen-trasi 400 JI/larva paling efektif membunuh larva, menurunkan bobot larva, bobot pupa, jumlah telur yang dihasilkan, dan fertilitas telur. High intensity of chemical pesticide application has become a serious concern of environmentalists in recent years, because of various negative impacts of it. Therefore, environmentally friendly techniques of controlling insect pest are needed. Recently, the use of entomopathogenic nematodes, especially Steinernema sp., has created new possibilities of promising control techniques against insect pests. The aim of this study was to evaluate the effectiveness of Steinernema sp. to A. janata larvae in laboratory. This research was conducted at the Laboratory of Insect Pathology Laboratory of Indonesian Sweetener and Fiber Crops Research Insti-tute from March to August 2011. Tests used the 2nd stage larvae of Achaea janata, the leaf eater of castor (Ricinus communis). Treatment arranged in a completely randomized design (CRD) with 4 replicates. For each test used 25 larvae which were exposed to various concentrations of Steinernema sp. Concentration of Steinernema sp. used was 0, 50, 100, 200, 300, and 400 infective juvenile/larvae. Daily mortality A. janata larvae, larval and pupal weight, the number of eggs laid, and number of hatch eggs were recorded. Steinernema sp. on concentration of 200; 300; and 400 IJ/larvae was effective to cause mortality of A. janata larvae (80–94% mortality after 48–120 hours). The higher the concentration of the nematode the higher larval mortality. Steinernema sp. with concentration of 400 IJ/ larvae was effective decreasing larval and pupal weight, the number of eggs laid, and fertility of the eggs produced.
Potensi Nematoda Patogen Serangga Steinernema spp. dalam Pengendalian Hama Utama Tanaman Kapas Prabowo, Heri; Indrayani, I.G.A.A.
Buletin Tanaman Tembakau, Serat & Minyak Industri Vol 1, No 2 (2009): Oktober 2009
Publisher : Balai Penelitian Tanaman Pemanis dan Serat (Balittas)

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Steinernema spp. memiliki potensi untuk mengendalikan hama tanaman kapas seperti Helicoverpa armigera dan Pectinophora gossypiella. Steinernema spp. mampu menyebabkan mortalitas P. gossypiella dan H. armi-gera berturut-turut sebesar 31,6–55,4 dan 46,3–63,8%. Steinernema spp. memiliki kemampuan membunuh lebih baik pada P. gossypiella, sedangkan kemampuan reproduksi dalam inangnya lebih baik pada H. armi-gera. Steinernema spp. mampu menginfeksi serangga inang lebih baik pada stadium ulat lebih tua diban-dingkan stadium muda. Steinernema spp. dapat diproduksi secara in vivo dan in vitro. Produksi secara in vivo dapat menggunakan Tenebrio molitor, Tirathaba rufivena, dan Attacus atlas. Produksi secara in vitro dapat menggunakan usus ayam, lemak sapi, dan minyak kedelai. Perlu dikembangkan formulasi Steinerne-ma spp. yang murah dan efektif untuk mengendalikan hama di atas permukaan tanah. Selain itu diperlukan pencarian isolat Steinernema spp. yang virulen dan cepat membunuh hama sasaran. Steinernema spp. could be potentially used for controlling H. armigera and P. gossypiella on cotton. Steiner-nema spp. causes mortality on P. gossypiella and H. armigera 31,6–55,4 and 46,3–63,8% respectively. The nematode causes a higher mortality on P. gossypiella than on H. armigera, however, produces more juvenile infective on H. armigera than on P. gossypiella. Higher successful infections of Steinernema spp. occurs on late larval stadium than on early one. Production of Steinernema spp. can be in vivo using Tenebrio molitor, Tirathaba rufivena, and Attacus atlas; and in vitro using chicken intestinum, cow lipid, and soy bean oil. For effecttively use, this nematode need to be formulated especially for controlling insect pests on soil surface, as well as finding the more virulent isolates against the target insects.
INERGISME ANTARA NEMATODA PATOGEN SERANGGA Steinernema sp. DAN MINYAK BIJI JARAK PAGAR (Jatropha curcas L.) TERHADAP MORTALITAS DAN EFEK LANJUTAN LARVA Spodoptera litura F. TUKIMIN, TUKIMIN; KARMAWATI, ELNA; PRABOWO, HERI
853-8212
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

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ABSTRAKPenggunaan insektisida kimia untuk pengendalian seranggamenimbulkan dampak negatif. Oleh karena itu, diperlukan pengendalianhama yang ramah lingkungan. Nematoda patogen serangga dan pestisidanabati minyak biji jarak pagar (MBJP) memiliki peluang untukdikembangkan sebagai agensia pengendali Spodoptera litura F. Tujuanpenelitian ini untuk mengevaluasi efek kombinasi antara nematodapatogen serangga Steinernema sp. dan pestisida nabati MBJP terhadapmortalitas dan efek lanjutan larva S. litura. Penelitian dilaksanakan diLaboratorium Entomologi, Balai Penelitian Tanaman Pemanis dan Seratpada bulan Maret sampai Juni 2012, menggunakan rancangan acakkelompok (RAK) pola faktorial dengan 4 ulangan. Perlakuan konsentrasiMBJP yang digunakan adalah 2,5 ; 5 ; 10 dan 20 ml/l, kontrol air, sertakontrol air + 1 g deterjen. Konsentrasi Steinernema sp. adalah 0, 200, 400,dan 800 JI (juvenil infektif)/ml. Nematoda Steinernema sp. dimasukkan kedalam larutan pada saat aplikasi larva S. litura sebanyak 25 larva instardua tiap perlakuan. Jumlah larva yang mati diamati pada 24, 48, 72, 96,dan 120 jam setelah penyemprotan. Hasil penelitian menunjukkan bahwakombinasi konsentrasi antara MBJP dan Steinernema sp. yangmenghasilkan mortalitas larva S. litura tertinggi adalah 10 ml/l dan 400 JI/latau 2,5 ml/l dan 800 JI/l. Efek lanjut MBJP mengakibatkan kerusakanpada fase prapupa dan pupa, yaitu menjadi cacat serta penurunan jumlahtelur dan kemampuan telur menetas. Kenaikan konsentrasi MBJP dari 2,5ke 20 ml/l mengakibatkan penurunan kemampuan penetasan telur dari76,29 menjadi 32,37%.Kata kunci: Steinernema sp., Jatropha curcas, Spodoptera lituraABSTRACTThe use of chemical insecticides to control pests causes variousnegative impacts. Thus, environmentally friendly methods of control aremuch in need recently. The combination of entomopathogenic nematodesand botanical insecticides based on physic nut oil (PNO) has opened upnew possibilities of promising control methods against Spodoptera lituraF. The objective of the study was to evaluate the combination effectbetween botanical insecticides PNO and the entomopathogenic nematodeSteinernema sp. on S. litura. The research was conducted at the laboratoryof Entomology Indonesian Sweetener and Fiber Crops Research Institutefrom March to June 2012. The treatments were arranged in a completelyrandomized block design (CRBD) with factorial pattern, replicated fourtimes. The concentrations of PNO were 2,5; 5; 10, and 20 ml/l, controlwater and control water + 1 g detergent. Concentration of Steinernema sp.were 0,200, 400, and 800 IJ (infective juvenile)/ml. Nematodes wereadded simultaneously after application of PNO. Insect larvae were exposedto various concentrations of Steinernema sp. and PNO. Numbers of deadlarvae were observed at 24, 48, 72, 96, 120 hours after spraying. The resultshowed that the concentration combination between PNO and nematodewhich resulted maximum larvae mortality is 10 ml/l and 400 IJ/ml or 2,5ml/l and 800 IJ/ml. The impacts of PNO were disabled prepupa and pupa,decrease of eggs number and hatching ability. The increase ofconcentration used from 2.5 to 20 ml/l resulted the decreased of hatchingfrom 76.29 to 36.37%.Key words: Steinernema sp., Jatropha curcas, Spodoptera litura
PATOGENISITAS Achaea janata GRANULOSIS VIRUS (AjGV) TERHADAP ULAT PEMAKAN DAUN TANAMAN JARAK KEPYAR INDRAYANI, IGAA.; PRABOWO, HERI; YULIANTI, TITIEK
853-8212
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

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ABSTRAKAchaea janata L. adalah hama penting tanaman jarak kepyar(Ricinus  communis)  yang  hingga  kini  pengendaliannya  masihmenggunakan insektisida kimia secara intensif. Selain tidak efisien,insektisida kimia juga menimbulkan pencemaran lingkungan. Untukmengatasi masalah tersebut, maka perlu cara pengendalian alternatif yangselain efektif dan efisien, juga ramah lingkungan, seperti virus yangdiisolasi dari ulat A. janata (A. janata Granulosis Virus/AjGV). Penelitianpatogenisitas AjGV pada A. janata dilakukan di Laboratorium PatologiSerangga Balai Penelitian Tanaman Pemanis dan Serat (Balittas) mulaiJanuari - Desember 2012. Perlakuan terdiri atas enam konsentrasi AjGV,yaitu 10 3 , 10 4 , 10 5 , 10 6 , 10 7 , 10 8 occlusion bodies (OB), dan satu kontrol.Perlakuan disusun dalam Rancangan Acak Kelompok dengan empat kaliulangan. Ulat A. janata yang digunakan adalah instar II, III, IV, dan Vmasing-masing 90 ekor/perlakuan. Parameter yang diamati adalahmortalitas dan bobot ulat, konsentrasi untuk membunuh 50% ulat (LC 50 ),dan waktu untuk membunuh 50% ulat (LT 50 ). Hasil penelitianmenunjukkan bahwa AjGV patogenik terhadap A. janata, terutama ulatinstar II dan III dengan mortalitas berturut-turut 90 dan 86,7%. LC 50 AjGVpada ulat instar II dan III masing-masing mencapai 1,0 x 10 3 dan 1,2 x 10 3OB/ml, dengan LT 50 kedua instar sekitar 3,4-4,2 hari. Pengaruh infeksiAjGV pada ulat A. janata efektif menurunkan bobot ulat hidup 57,9 dan57,4% masing-masing pada ulat instar II dan III. Hasil penelitian inimengindikasikan bahwa sasaran yang tepat untuk pengendalian ulat A.janata dengan AjGV di lapangan adalah pada saat instar II dan III.Kata kunci: Achaea janata L, patogenisitas, instar, mortalitasABSTRACTAchaea janata L. is an important insect pest of castor plant (Ricinuscommunis L.) that was intensively controlled by chemical insecticidecaused inefficiency and an environmental polution. To solve the problemsit needs an effective, efficient and environmental friendly of alternativecontrol, especially using Granulosis Virus isolated from A. janata larvae(AjGV). Study on pathogenicity of A. janata virus isolate against castorleaf-eater, A. janata L. was conducted at Insect Pathology Laboratory ofIndonesia Sweetener and Fibre Crops Research Institute in Malang fromJanuary to December 2012. The objective of study is to test thepathogenicity of AjGV against A. janata larvae. Treatment consists of sixconcentrations of AjGV, viz. 10 3 , 10 4 , 10 5 , 10 6 , 10 7 , 10 8 OBs/ml and onecontrol. Four instars of larvae, e.g. second, third, fourth, and fifth wereused in this study. Each treatments was arranged in Randomized BlockDesign with four replications. Parameter recorded were mortality andweight of larvae, LC 50 , and LT 50 . Result showed that AjGV was pathogenicto A. janata larvae, mainly on second and third instar in resulting of 90%and 86.7% of mortality, respectively. The LC 50 of AjGV on the second andthird instar was 1.0 x 10 3 and 1.2 x 10 3 OB/ml, respectively and the LT 50was 3.4 and 4.2 days, respectively. Infection of A. janata virus reducedthe weight of both instar up to 57.9% and 57.4%, respectively. This resultindicated that the second and third was the suitable instars of A. janatalarvae for better control of AjGV in field.Key word: Achaea janata L, pathogenicity, instar, mortality
PATOGENISITAS DUA ISOLAT LOKAL JAMUR Nomuraea rileyi (FARLOW) SAMSON TERHADAP Helicoverpa armigera HUBNER (LEPIDOPTERA: NOCTUIDAE) INDRAYANI, IGAA.; PRABOWO, HERI; MULYANINGSIH, SRI
853-8212
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

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ABSTRAKEpizootik Nomuraea rileyi telah berkembang secara alami dalampopulasi lebih dari 30 spesies serangga inang, termasuk H. armigera.Penelitian ini dilakukan di Laboratorium Patologi Serangga BalaiPenelitian Tanaman Pemanis dan Serat Malang mulai Januari hinggaDesember 2011, tujuannya untuk mengetahui patogenisitas dua isolat lokaljamur entomopatogen N. rileyi terhadap larva H. armigera. Penelitianterdiri atas dua faktor perlakuan, faktor 1 adalah dua isolat lokal N. rileyi,yaitu ML 01 dan LG 02, dan faktor 2 adalah konsentrasi konidia, yaitu: 2,2x 10 5 ; 4,5 x 10 5 ; 2,2 x 10 6 ; 4,5 x 10 6 ; 2,2 x 10 7 ; 4,5 x 10 7 ; 2,2 x 10 8 ; 4,5 x10 8 konidia/ml, dan kontrol. Setiap perlakuan disusun dalam RancanganAcak Kelompok Faktorial dengan tiga kali ulangan. Aplikasi jamur padalarva H. armigera dilakukan dengan metode kontaminasi permukaanmedia yang berupa daun kapas muda (1cm 2 ) di dalam ruangan bersuhu25±1⁰C dan kelembapan 75-80%. Parameter yang diamati adalahmortalitas larva, LC 50 dan LT 50 , serta bobot larva. Hasil penelitianmenunjukkan bahwa tingkat patogenisitas isolat ML 01 terhadap larva H.armigera lebih tinggi dibandingkan dengan isolat LG 02. Isolat ML 01menyebabkan mortalitas larva H. armigera antara 51,13-85,56% (LC 50  =2,5 x 10 2  Konidia/ml) dan isolat LG 02 antara 43,36-78,90%, (LC 50  =5x10 6  Konidia/ml). LT 50 isolat ML 01 antara 5,2-5,5 hari, sedangkan isolatLG 02 antara 6,8-7,0 hari, terutama pada konsentrasi 2,2-4,5 x 10 8konidia/ml. Terdapat korelasi positif yang erat antara konsentrasi konidiadan mortalitas larva baik pada isolat ML 01 (r=0,975) maupun LG 02(r=0,980), demikian pula antara konsentrasi konidia dan kehilangan bobotlarva pada isolat ML 01 (r=0,982) dan LG 02 (r=0,972).Kata kunci: Helicoverpa armigera, Nomuraea rileyi, patogenisitas, isolat,mortalitasABSTRACTThe epizootic of the fungi Nomuraea rileyi has naturally developedin more than 30 species of insect host population, including cottonbollworm, H. armigera. A study on pathogenicity of two local isolates ofNomuraea rileyi (Farlow) Samson fungi against Helicoverpa armigera(Hubner) (Lepidoptera: Noctuidae) was conducted at Insect PathologyLaboratory of Indonesian Sweeteners and Fibers Crops Research Institute(ISFCRI) in Malang from January to December 2011 in order to find outthe pathogenicity of the isolates against H. armigera larvae. This studyconsists of two factors as treatment. The first factor was N. rileyi isolates,e.g. ML 01 and LG 02, and the second factor were eight conidiaconcentrations, viz. 2.2 x 10 5 ; 4.5 x 10 5 ; 2.2 x 10 6 ; 4.5 x 10 6 ; 2.2 x 10 7 ; 4.5x 10 7 ; 2.2 x 10 8 ; 4.5 x 10 8 conidia/ml, and one untreated control.Treatments were arranged in Factorial Randomized Block Design withthree replications. Suspense of conidia was applied by surfacecontamination method of cotton leaf as medium at 25±1⁰C of temperatureand 75-80% of humidity. Parameter observed were larval mortality, LC 50 ,LT 50 , and larval weight. Result showed that ML 01 isolate was morepathogenic against H. armigera larvae than LG 02 isolate based on larvalmortality, LC 50 , and LT 50 . Percentage of mortality of H. armigera larvaedue to ML 01 and LG 02 infection were 51.1- 85.56% and 43.36-78.90%,respectively. The LC 50 of ML 01 and LG 02 isolates was 5.2-5.5 days and6.8-7.0 days, respectively.There are closest positive correlation betweenconidia concentration and percentage of mortality on ML 01 (r = 0.975)and LG 02 (r = 0.980) isolates as well as between conidia concentrationand larval weight loss on ML 01 (r = 0.982) and LG 02 (r = 0.972)isolates.Key words: Helicoverpa armigera, Nomuraea rileyi, pathogenicity,isolate, mortality
Pengaruh Ekstrak Daun Nerium oleander L. terhadap Mortalitas dan Perkembangan Hama Spodoptera litura Fab. Prabowo, Heri
Biota : Jurnal Ilmiah Ilmu-Ilmu Hayati Vol 15, No 3 (2010): October 2010
Publisher : Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.521 KB) | DOI: 10.24002/biota.v15i3.2599

Abstract

Research was conducted at the Laboratory of Entomology, Tobacco and Fiber Crops Research Center from June to July 2009. Tests were conducted on the larvae of Spodoptera litura second instar. Concentration of leaf extract of N. oleander used was 0; 2x105; 3x105; 4x105; and 5x105ppm. Treatment was done by spraying method in the spray chamber. Treatment was arranged in a completely randomized design (RAL) with 4-time repetition. Each repetition used 25 larvae. Observed parameters included the death for every 24, 48, 72, and 96 hours; length, width, and weight of larvae after 96 hours after treatment. By 96 hours after treatment with the concentration of leaf extract 0; 2x105; 3x105; 4x105; and 5x105ppm it was capable of causing mortality S. litura, respectively for 0; 48.33; 53.33; 66.67%, dan 76.67%. By 96 hours after treatment extract concentration required to cause mortality S. litura was 25, 50, and 95% respectively of 2.35x105, 4.44x105, and 9.49x105ppm. After 96-hour treatment the concentration of leaf extract 0; 2x105; 3x105; 4x105; and 5x105ppm could cause the length, width, and weight of S. litura, respectively for 0.89 mm; 0.91 mm; 0.93 mm; 0.94 mm; 0.95 mm; 0.15 mm; 0.16 mm; 0.17 mm; 0.18 mm; 0.19 mm, 0.011 g; 0.012 gr; 0.013 g; 0.014 g and 0.016 gr. The use of N. oleander leaf extract caused mortality of S. litura between 13.33−76.67% at 24 to 96 hours after treatment. Leaf extract of N. oleander potentially caused mortality S. litura. The use of this leaf extract could also inhibit the length, width, and weight of larvae.
PENGARUH HARGA, FASILITAS DAN KUALITAS PELAYANAN TERHADAP MINAT BERKUNJUNG KEMBALI PADA HOTEL CHANTI SEMARANG 2020 Gultom, Henry Casandra; Sakti, Ronal Dino Kuncoro; Prabowo, Heri
BBM (Buletin Bisnis & Manajemen) Vol 7, No 2: Agustus 2021
Publisher : Sekolah Tinggi Ilmu Ekonomi YPPI Rembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47686/bbm.v7i2.410

Abstract

This study aims to determine the effect of price, facilities and service quality on interest inreturning to Chanti Hotel Semarang. This research was conducted on visitors to Hotel ChantiSemarang. The population in this study were all visitors to the Chanti Hotel Semarang in 2019/2020,the sample in this study was 100 respondents. In collecting research data using a Likert scale with 5assessment criteria and to measure 24 statement items. The sampling technique in this researchuses a type of probability sampling. The data analysis technique is linear regression analysis. Haslianalysis states that price affects the interest to return partially, facilities do not have a partial effectand service quality greatly affects the interest in returning to visit.
SISTEM INFORMASI PANDUAN TRAYEK ANGKUTAN UMUM BERBASIS MOBILE SMARTPHONE PADA DINAS PERHUBUNGAN JAKARTA Prabowo, Heri; Herlawati, Herlawati; Mustika, Wida Prima
Jurnal Pilar Nusa Mandiri Vol 10 No 1 (2014): Pilar Nusa Mandiri : Journal of Computing and Information System Periode Maret 2
Publisher : LPPM Universitas Nusa Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (923.167 KB) | DOI: 10.33480/pilar.v10i1.463

Abstract

Public transport is an integral part of the city's transportation system and is a component whose role is very significant because the condition of the poor public transport system will cause a decline in the effectiveness and efficiency of public transport itself. Smartphone users or the public can use and take advantage of its mobile devices to be able to search for information about public transportation route and location of the place to be searched. Mobile applications natively public transportation route system is based on the PhoneGap framework and uses GoogleMaps as an interface map, the language he uses is HTML5, Javascript, JQuery Mobile. Algorithm method used is the Dijstra method. Dijkstra method can be used to determine the fastest path from a node. These properties can be applied to determine the trajectory path of nearby public transportation. The accuracy of the reading position ( Location Base Services ) on the map approximately 97 % of the radius of a meter scale map. The accuracy depends on GPS devices and mobile handsets speed internet bandwidth.
Distribution system dewatering in coal mining at PIT Sena Sungai Lilin District, Musi Banyuasin Regency, South Sumatra Province Prabowo, Heri; Wahyudi, Wahyudi; Rolitu, Rolitu
Jurnal Pendidikan Teknologi Kejuruan Vol 6 No 2 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v6i2.32623

Abstract

The purpose of this research is to calculate the total design discharge of water entering the mining site in the sena pit of PT Putra Muba Coal (PMC), design the appropriate shape and dimensions of the sump to accommodate the amount of water entering the mining site and calculate the number of pumps needed to remove water entering the mine to the settling pond. The source of water entering the mine area comes from rainwater entering the mine opening, water runoff from the rainwater catchment area in the area around the mine opening, and groundwater rise. Based on the results of the analysis of rainfall data for 2013-2022, a rainfall plan of 77, 225 mm/day, rainfall intensity of 9.714 mm/hour with a rainfall return period of 2 years was obtained. The rainfall catchment area at the research site is 72,936 m2 with a discharge generated of 0.03 m3 / second and groundwater discharge of 0.00812 m3 / second. To remove the water entering the mine, it is flowed naturally into the sump with dimensions of 50 m length, 14 m top width, 13 m bottom width, and 5 m depth. The dimensions of the open channel are planned with a channel width of 32 cm, a flow depth of 28 cm, a wet cross-sectional area of 13.6 cm2, a wet circumference of 97 cm, a hydraulic radius of 9.25 cm, and a channel length of 233m. The water in the sump is pumped into an open channel. The pump used has a maximum discharge of 150 m3 / hour and a total pump head of 11.8712 m with a pipe diameter of 6 inches.
Co-Authors Algifari, Arif Ananda, Rizky Bayu Kurniawan Dyah Roeswitawati Elna Karmawati Gultom, Henry Casandra HAR, Rusli Harizona Aulia Rahman Herlawati Herlawati Hutmi, Rahul I.G.A.A. Indrayani IGAA. INDRAYANI, IGAA. Indang Dewata Lazuar, Carissa Aria Millenia Makertihartha, I. G. B. N. MP Editor, Ir. Dian Indratmi, MP Nidya, Nindy Prianka Ratri Nastiti Rolitu, Rolitu Sakti, Ronal Dino Kuncoro Sri Mulyaningsih Subagjo Subagjo Sutrisno, Sutrisno Titiek YULIANTI TUKIMIN TUKIMIN, TUKIMIN UZD, Marcelino Wahyudi Wahyudi Wida Prima Mustika