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Synthesis and Characterization of Nafion-SiO2 Composite Membranes as an Electrolyte for Medium Temperature and Low Relative Humidity Mahreni, Mahreni; Listiani Dewi, Eniya; Marnoto, Tjukup; Pawignyo, Harso; Subagyo, Purwo; Sulistyowati, Endang
International Journal of Science and Engineering (IJSE) Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

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The weakness of the Nafion membrane as electrolyte of PEMFC associated with physical properties that is easy to shrink at temperatures above 80°C due to dehydration. Shrinkage will decrease the conductivity and membrane damage. Nafion-SiO2 composite membranes can improve membrane stability. The role of SiO2 in the Nafion clusters is as water absorbent cause the membrane remains wet at high temperatures and low humidity and conductivity remains high. The results showed the content of 2.8 wt% of SiO2 in the Nafion membrane, the conductivity of composite membrane is higher than the pure Nafion membrane that are 0.127 S cm-1 in dry conditions and 0.778 S cm-1 in wet conditions at room temperature. Compared with the pure Nafion membrane conductivity are 0.0661 S cm-1 and 0.448 S cm-1 respectively in dry and wet conditions.
The Characteristic of Heat Pump Dehumidifier Drier in the Drying of Red Chili (Capsium annum L) Marnoto, Tjukup; Sulistyowati, Endang; Mahreni, Mahreni; Syahri, M.
International Journal of Science and Engineering (IJSE) Vol 3, No 1 (2012)
Publisher : Chemical Engineering Diponegoro University

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Preservation of agricultural products have a very important to avoid the dropped of selling price when the harvest season arrives. Agricultural products are perishable because of high water content approximately 80 % which if the moisture content above 10% encourages proliferation of spoilage microorganisms in the material and cause the short shelf life. One way that has been done to preserve agricultural products such as red chili is dried using direct sunlight. Weakness of the sun drying can not reduce the water content to below 10% so spoilage microorganisms can live and breed, cause the short self life. Drying using Heat Pump Humidification Technology (HPD) is one solution to overcome the disadvantages of the direct sun drying. HPD can reduce the moisture content up to or below 10% will increase the self life and make easier to crush and to produce a chili powder. The purpose of this study to determine the appropriate mathematical model of the drying phenomena. The constant of the model equations are determined by Sum Square Error (SSE). Before being dried chilies dipped in hot water to remove the wax. PHD is used as an air dehumidifier that circulate in the dryer. Humidity difference causes the displacement of water from the chilies to dry air and lower the moisture content of chili. Moisture content of chili every 5 minutes is analyzed using gravimetric method. The results showed that the texture of the chili is very fragile with a moisture content of less than 10% and in the best conditions, the moisture content of chili is 6:35 wt%. From the research found that the appropriate model is Lewis model and the constant of the models obtained (k = 0.0056). Due to the moisture content of the product below 10 wt%, PHD can be considered as an agricultural product dryer. Keywords — Chili, drying, heat pump, hpd
Penentuan Aktivitas Perdagangan dan Jasa di Kawasan Jalan Panglima Sudirman Kabupaten Nganjuk Sulistyowati, Endang; Ariastita, Putu Gde
Jurnal Teknik ITS Vol 3, No 2 (2014)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

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Sebagai kawasan perdagangan dan jasa, kawasan Jalan Panglima Sudirman Kabupaten Nganjuk merupakan kawasan yang berpotensi berkembang pesat. Akan tetapi belum ada ketentuan dalam mengatur aktivitas perdagangan dan jasa yang diperbolehkan, terbatas, bersyarat dan dilarang di lokasi tersebut. Penelitian ini bertujuan untuk menentukan aktivitas perdagangan dan jasa di Kawasan Jalan Panglima Sudirman Kabupaten Nganjuk sebagai upaya awal dalam menyusun instrumen pengendalian aktivitas dalam peraturan zonasi. Metode analisa yang digunakan dalam penelitian adalah teknik analisis deskriptif kulitatif dan teknis analisis Delphi. Hasil dari penelitian merupakan sebuah pengaturan aktivitas dengan klasifikasi diijinkan, terbatas, bersyarat dan dilarang. Aktivitas yang diijinkan antara lain adalah aktivitas yang umumnya memiliki kavling <400 m2, jenis gangguan ringan dan aktivitas yang sesuai dengan skala pelayanan. Untuk aktivitas yang terbatas dan bersyarat hampir memiliki kriteria yang sama yaitu ukuran kavling 400-5.000 m2 dan merupakan aktivitas yang tidak sesuai dengan skala pelayanan yang telah ditetapkan. Perbedaannya terletak pada jenis gangguan kronis dan akut untuk aktivitas bersyarat dan ketentuan jam operasi 16-24 jam untuk aktivitas terbatas. Sedangkan untuk aktivitas yang dilarang adalah aktivitas yang memiliki luas kavling > 5.000 m2.
Effectiveness of Sex Pheromone in Controlling Cocoa Pod Borer, Conopomorpha cramerella (Snell.) Sulistyowati, Endang
Pelita Perkebunan (Coffee and Cocoa Research Journal) Vol 30, No 2 (2014)
Publisher : Indonesian Coffee and Cocoa Research Institute

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Cocoa pod borer (CPB, Conopomorpha cramerella  nell.) is a dangerous pest of cocoa which seriously reduce cocoa production mainly in Southeast Asia and Pasific. Prevention of CPB attack can be done by pod sleeving to prevent CPBs lay eggs on pod, or reduction of source of CPB infestation by using pheromone or kairomone as attractant in an insect trap. A preliminary research using sex pheromone has been conducted at endemic cocoa area infested by CPB in East Java. The objective of this study was to evaluate the effectiveness of sex pheromonesin controlling CPB. Trial was arranged by randomized completely block design in four treatments and four blocks as replication. Four densities trap/ha (0, 4, 8, and 12 traps/ha) were used as a treatments. Sex pheromone trap consisted of synthetic pheromone (lure) and sticky liner was hanged on 0.5 m above the cocoa canopy. The results showed that the number of CPB captured during four months was significantly decreased. The number of CPB captured per trap during the first two months in the treatment of 0, 4, 8 and 12 traps/ha were 0, 6.5, 4.72, and 5.58 CPBs, respectively. Four months after treatment, the number of CPB captured in the respective treatments was reduced to 0, 0.25, 0.6, and 0.96 CPBs. Estimate calculation on yield loss due to CPB attack showed that before treatment the yield loss ranged 37.4—45.6%, however six months after treatment, the yield loss in treatment plots decreased to 9.4—21%, whereas on control 38.47%. Use of sex pheromones to attract CPB at a density of 4 traps/ha reduced yield losses due to CPB damage by 67.7%. The significant correlation betweenthe number of CPB captured with the damage intensity followed regression equation of Y = - 0,00044X + 0,32059. Use of sex pheromone for monitoring or masstrapping of CPB, as a component in IPM of CPB is promising, due to its nature for specific target, environmentally friendly, effectiveness, and economic values.Key words: cocoa, cocoa pod borer, Conopomorpha cramerella, integrated pest management, biological control, sex pheromone
Development of Monitoring Technique for Cocoa Pod Borer(Conopomorpha cramerella Snell.) Sulistyowati, Endang; Wardani, Suryo; Mufrihati, Endang
Pelita Perkebunan (Coffee and Cocoa Research Journal) Vol 21, No 3 (2005)
Publisher : Indonesian Coffee and Cocoa Research Institute

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Effectiveness and effiency of CPB control were influenced by the right time of control. To decided this methods, information about CPB infestation was needed. An experiment had been conducted to get a simple and accurate technique for CPB monitoring. The experiment was located in Tirawuta, a smallholder cocoa plantation in Kolaka district, South-East Sulawesi. The evaluated monitoring pods techniques using observing all ripe cocoa pod as standard method, i.e. pod colour changes as an indicator of CPB attack, observation on 100 pods during harvesting, moth trapping and observation on the presence of the holes caused by CPB. The collected data expressed as the percentage of CPB attack and compared with each other. Based on the Chi 2 value and time consumed for monitoring, it could be concluded that the observation of 100 attacked pods during harvesting was the most accurate technique closest to the standard method, with a lowest 2 value and not significantly different to standard method. On the contrary the visual observation on the pod colour showed the less accurate technique with  2 value of 242,25–335,33 followed by the bservation on the present of holes on the pod with  2 value of 243,45–282,87. Furthermore, monitoring technique by moth trapping could not be compared with the other techniques since their unit was unequal. However, no insect could be trapped during a night trapping using either chemical trapping or sticky trap. Development of sticky trap by variation in trap colour could be trapped of CPB moth during more than one week. Red trap was the most interesting (preferred) for the CPB followed by the yellow, white and blue ones. There was significant correlation between number of tree sample and the time needed for observation. Larger size of tree sample consumed a longer time for the observation, but in visual symptom and entry/exit hole observation methods, larger sample size did not significantly influence its accuracy. It’s concluded that both of monitoring technique were not a converge estimation. Key words : Cocoa, cocoa pod borer, Conopomorpha cramerella, Integrated Pest Management, monitoring technique.
Suplementasi Level Temulawak (Curcuma xanthorrhiza, Roxb) yang Berbeda dalam Konsentrat pada Sapi Frisien Holland Laktasi: Pengaruhnya terhadap Total Digestible Nutrient (TDN) Ransum Sulistyowati, Endang; Badarina, Irma; Santoso, Urip
Jurnal Sain Peternakan Indonesia Vol 5, No 1 (2010)
Publisher : Universitas Bengkulu

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ABSTRAKTujuan dari penelitian ini adalah untuk mengevaluasi konsumsi, kecernaan, dan TDN ransum dengan Konsentrat yang mengandung beberapa level temulawak pada sapi FH laktasi. Selanjutnya, konsentrat ini disebut sebagai KL atau Konsentrat Laktasi. Konsentrat Laktasi adalah bentuk konsentrat dari Blok Tabut yang telah diteliti sebelumnya. Formula KL adalah 30% tepung cassava, 35% dedak halus, 15% jagung giling, 2% kapur, 4% garam, 1% TSP, 1% Premix, 7% urea, 0,5% ragi tape, 1% Starbio, 2% gula aren, 1,5% minyak sawit. Untuk meningkatkan produksi susu dengan tingkat kecernaan dan TDN yang optimal, dilakukan modifikasi konsentrat dengan suplementasi empat level temulawak (C. xanthorriza, Roxb). Adapun 4 level temulawak adalahKL0 (10% = 15 g/kg KL), KL1 (15% = 22 g/kg KL), KL2 (30 g/kg KL), dan KL3 (37 g/kg KL). Rancangan penelitian adalah Rancangan Acak Lengkap, 4 perlakuan dan 3 ulangan. Total sapi perah FH laktasi yang digunakan adalah 12 ekor. Aplikasi KL dilakukan selama 7 minggu, termasuk 1 minggu sebagai pendahuluan. Konsentrat laktasi diberikan sebanyak 3 kg/ekor/hari, bersama 3 kg/ekor/hari konsentrat peternak (disebut konsetrat SKR, terdiri atas 53.70% ampas tahu, 44.74% dedak halus, 0.89% dolomit, 0.22% garam, dan 0.45% urea) and 25 kg/harirumput lapang atau 50% konsentrat dan 50% hijauan. Konsumsi ransum (20,49 – 22,46 kg/ekor/hari) dan konsumsi bahan kering ( 7,75- 8,35 kg/ekor/hari) tidak secara nyata berbeda (p>0,05). Namun, kecernaan bahan organik, protein kasar, serat kasar, dan ekstrak eter secara nyata berbeda (p<0.05). Hasil penelitian menunjukkan  bahwa KL0 yang mengandung temulawak 15 g/kg KL menghasilkan produksi susu paling tinggi (5,65 kg/ekor/hari) dengan kecernaan BK sebesar 82,81% dan TDN sebesar 64,87%.Kata kunci: C. xanthorrhiza, Roxb, FH laktasi, Konsentrat, TDN.
Total Digestible Nutrient of Diet Containing PUFA- Concentrate Supplemented with Yeast and Curcuma xanthorrhiza Roxb for Dairy Goat Sulistyowati, Endang; Sudarman, Asep; Wiryawan, Komang G.; Toharmat, Toto
Jurnal Sain Peternakan Indonesia Vol 9, No 2 (2014)
Publisher : Universitas Bengkulu

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ABSTRACTThis research was designed to evaluate nutrient digestibility, mentioned as Total Digestible Nutrient of diet containing PUFA (polyunsaturated fatty acid) - concentrate supplemented with yeast and Curcuma xanthorrhiza Roxb for dairy goat. Twenty Ettawah crossbred goat in late lactation were allocated into 6 treatments in randomized block design. The treatments were PD0: PUFA-diet with no supplement, PDA: with Asifit, PDY: with 0.5% yeast, PDC: with 1.5% curcuma, and PDM: with 0.5% yeast + 1.5% curcuma. The PUFA-diet contained of 80% PUFA- concentrate as basic diet and 20% Pennisetum purpureum. While the PUFA sources were roasted ground corn and roasted soybean meal, and corn oil. Results showed that intakes of DM, OM, CP, CF, NFE, ADF, and GE were not affected significantly by dietary treatments. However, EE and NDF among treatments were different significantly (P<0.05), whereas Ca and P were different very significantly (P<0.01). High nutrient contents (DM, OM, CP, EE, CF, NDF, and GE) were found in feces of the goat with curcuma diet (PDC), consequently showed the opposite effects by giving the lowest digestibility (P<0.05 or P<0.01) of these nutrients. Total digestible nutrient (TDN) of PDY and PDM were markedly higher (79.89% and 79.37%, respectively) than that in other diets, such as being the lowest was in PDC (69.94%). This suggested that the yeast concentration of 1.8 108cfu/d, given singly or in combination with 1.5% Curcuma could be considered as the right level for improving nutrient digestibility in the late lactation goat in our study.Keywords: curcuma, dairy goat, PUFA-diet, TDN, yeast
Penampilan Reproduksi Sapi Perah FH (Friesh Holland) dan Pertumbuhan Pedetnya pada Umur 1- 3 bulan (Studi Kasus di Desa Air Duku dan Desa Air Putih Kali Bandung, Selupu Rejang, Rejang Lebong, Bengkulu) Sulistyowati, Endang; Kuswadi, Emran; Sutarno, Lobis; Tampubolon, Gilbert
Jurnal Sain Peternakan Indonesia Vol 4, No 1 (2009)
Publisher : Universitas Bengkulu

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ABSTRAKPenelitian ini bertujuan untuk mengevaluasi penampilan reproduksi induk sapi perah FH dan pertumbuhan pedet persilangannya (PFH) di Desa Air Duku dan Air Putih Kali Bandung, Kecamatan Selupu Rejang, Kabupaten Rejang Lebong, Bengkulu. Data diperoleh dengan cara survey terhadap sapi perah yang sedang bunting menjelang beranak (Purposive Random Sampling) selama lima bulan. Hasil penelitian menunjukkan bahwa Dari performans reproduksi, sapi perah di desa Air Putih Kali Bandung lebih efisien dilihat dari angka S/C yang lebih rendah (1,87) dan EPP yang lebih pendek (66,75 hari). Namun berat lahir anak sapi perah lebih berat (38 kg) di desa Air Duku, dengan pertambahan bobot badan anak sapi umur satu bulan secara rataan lebih tinggi (0,17 kg/bln). Untuk panjang badan dan tinggi gumba pedet pada saat lahir di Air Putih Kali Bandung lebih tinggi. Korelasi yang cukup erat antara bobot badan dan ketiga ukuran tubuh (lingkar dada, panjang badan dan tinggi gumba) terjadi pada pedet umur satu bulan di desa Air Putih Kali Bandung, yaitu dengan korelasi sebesar 0,7. Disimpulkan bahwa penampilan reproduksi lebih efisien di desa Air Putih Kali Bandung, sementara itu pertumbuhan pedet lebih baik di desa Air Duku.Kata Kunci: Performans Reproduksi, Sapi Perah, Bengkulu
Total Digestible Nutrient of Diet Containing PUFA- Concentrate Supplemented with Yeast and Curcuma xanthorrhiza Roxb for Dairy Goat Sulistyowati, Endang; Sudarman, Asep; Wiryawan, Komang G.; Toharmat, Toto
Jurnal Sain Peternakan Indonesia Vol 9, No 2 (2014)
Publisher : Universitas Bengkulu

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 ABSTRAKPenelitian ini didisain untuk mengevaluasi kecernaan nutrisi, dinyatakan dalam TDN, dari ransum yang mengandung PUFA konsentrat yang disuplementasi yeast dan Curcuma xanthorrhiza Roxb pada kambing perah.  Dua puluh ekor kambing Peranakan Ettawah (PE) pada fase laktasi akhir dialokasikan kedalam 6 perlakuan dengan Rancangan Acak Kelompok.  Perlakuan tersebut adalah: PD0: PUFA-diet tanpa suplemen, PDA: dengan Asifit, PDY: dengan 0,5% yeast, PDC: dengan 2% curcuma, dan PDM: dengan 0,5% yeast + 2% curcuma.  Ransum- PUFA terdiri atas 80% PUFA- konsentrat sebagai ransum dasar dan 20% rumput gajah.   Sumber PUFA terdiri atas jagung giling sangrai, tepung kedelai sangrai, dan minyak jagung.  Hasil menunjukkan bahwa  konsumsi  DM, OM, CP, CF, NFE, ADF, dan GE tidak terpengaruh oleh perlakuan.  Namun, EE dan NDF  antarperlakuan berbeda  signifikan (P<0.05), sedang Ca dan P  berbeda sangat signifikan (P<0.01).  Kandungan nutrisi yang tinggi (DM, OM, CP, EE, CF, NDF, and GE)  ditemukan di feces pada kambing dengan perlakuan Curcuma (PDC), konsekuensinya adalah kecernaan nutrisinya secara signifikan (P<0.05) atau sangat signifikan (P<0.01) terendah.  Total digestible nutrient (TDN) dari  PDY dan PDM secara signifikan tinggi (79,89% dan 79,37%) disbanding ransum lainnya, terendah pada PDC (69,94%).  Hal ini menunjukkan bahwa yeast atau ragi dengan konsentrasi 1,8 108cfu/d baik disuplementasikan tunggal atau dikombinasi dengan 2% Curcuma dapat dikatakan sebagai kandungan yang tepat untuk memperbaiki kecernaan nutrisi pada kambing perah dengan laktasi akhir pada penelitian ini.Kata kunci: curcuma, kambing perah,  PUFA-diet, TDN, yeast
ERROR ANALYSIS GEOMETRY QUESTIONS ON WORKING CLASS V SD / MI IN YOGYAKARTA Sulistyowati, Endang
JURNAL JPSD (Jurnal Pendidikan Sekolah Dasar) Vol 1, No 2: Agustus 2015
Publisher : Universitas Ahmad Dahlan

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 In 2013, the results of UAN for mathematics in primary schools / MI in DIY average value is lower than other subjects, namely Indonesian and IPA. The success of the sixth grade students work on problems UAN is inseparable from the ability of students to understand math at grade material underneath. Based on the experience of researchers, many teachers who have less correct geometry concepts. Of course this is an impact on students understanding of geometrical concepts. So in this study will be examined whether the errors are mostly done by students in grade V on the geometry of the material, especially material area and perimeter of a flat wake. This research is qualitative descriptive field. Subjects were 43 fifth grade students who come from 4 SD / MI in the city of Yogyakarta. Data retrieval by providing written test questions, the essay form. The results showed that the most frequent errors are errors of type-1, which is a misconception. Another error is the fault of type-3, namely: writing mathematical notation and use of the unit.