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PENGUJIAN PENGARUH VARIASI PUTARAN MESIN TERHADAP PERFORMANSI SISTEM PENGKONDISIAN UDARA PADA KENDARAAN PENUMPANG 1.500 cc

Jurnal Teknik Mesin Vol 5, No 3 (2016)
Publisher : Universitas Mercu Buana

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Abstract

Kompresor yang merupakan komponen utama memiliki peranan penting dalam mensirkulasikan dan mengkompresikan aliran refrigeran di dalam sistem pengkondisian udara. Dalam pengoperasiannya, kompresor diputar dengan crankshaft pulley mesin melalui sabuk (drive belt). Semakin tinggi putaran mesin, maka semakin tinggi pula putaran kompresor, begitu juga sebaliknya. Dapat dikatakan bahwa perubahan putaran mesin akan mempengaruhi kerja kompresor, yang pada akhirnya akan mempengaruhi performansi sistem pengkondisian udara pada kendaraan. Pengujian dilakukan dengan variasi putaran mesin mulai dari 788 rpm sampai dengan 3.288 rpm. Data-data awal yang didapat berupa tekanan rendah (low pressure) pada selang masuk kompresor dan tekanan tinggi (high pressure) pada pipa keluar kondensor. Berdasarkan kedua tekanan tersebut dapat diketahui properti refrigeran R-134a dengan menggunakan program miniREFPROP. Dari hasil pengujian pengaruh variasi putaran mesin terhadap performansi sistem pengkondisian udara yang pada kendaraan, dapat disimpulkan bahwa seiring meningkatnya putaran mesin, menyebabkan daya yang diperlukan kompresor semakin meningkat. Energi panas yang dilepaskan refrigeran di kondensor dan energi panas yang diserap refrigeran di evaporator (kapasitas pendinginan) juga mengalami peningkatan, sedangkan koefisien prestasi mengalami penurunan. Pada putaran mesin 788 rpm, koefisien prestasi yang dihasilkan sebesar 2,91. Pada kenaikan putaran mesin berikutnya koefisien prestasi mengalami penurunan sampai pada putaran mesin 3.288 rpm, koefisien prestasi yang dihasilkan sebesar 1,16.

DEVELOPMENT STRATEGY OF OIL PALM FARMERS’REVENUE

Jurnal Aplikasi Manajemen Vol 15, No 2 (2017)
Publisher : Jurusan Manajemen Fakultas Ekonomi dan Bisnis Universitas Brawijaya

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Abstract

This study aims to explain the impact of oil palm-cattle integration to increase the revenue of oil palm farmers Community in East Aceh. The method used in this study was descriptive qualitative. The data has been analyzed through three stages, the first stage is data reduction, the second stage is data display and the last stage is the conclusion. The results showed that the integration of oil palm with cattle have a positive impact on increased farmers’ revenue in East Aceh, it estimated approximately at 60% to 80%. This depends on the integration model being implemented, whether by letting the cattle graze freely (wild-release system) or by grazing them safely (enclosure system) and put the cattle in the cage at night.

Rehabilitation of Mangrove Ecosystem Through Community-Based Project and the Current Economic Value: A Case Study of Rehabilitation Project in Lubuk Kertang Village, Langkat Regency, North Sumatera

Jurnal Perikanan Universitas Gadjah Mada Vol 20, No 2 (2018)
Publisher : Universitas Gadjah Mada

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Abstract

Mangrove ecosystem plays an important role for socio-economic and environmental services. However, the rapid expansion of agricultural and industrial plantation activities challenged the sustainability of such ecosystem in Lubuk Kertang Village. This research aims to describe the potential of community-based to rehabilitate the degraded mangrove ecosystem and the economic benefit of such project for Lubuk Kertang villagers. The research was conducted using census methods for all respondents, including fishermen, handicraft makers, tourists, and the manager of the eco-tourism activity. The study showed that the successful of community on replanting the mangrove on mangrove ecosystem led by various factors, including the high willingness of community to participate on rehabilitation project, clear physical boundaries and rule enforcement, effective monitoring system and better conflict resolution mechanism. The total economic value in the mangrove area is Rp 1.057.343.654/year, comprising of Rp 601.077.437/year direct use value, Rp 395.786.267/year indirect value, Rp 22.279.950/year option use value, and Rp 38.200.000 existence value. The society based mangrove management has preserved the benefit potential value of not to endanger the change of mangrove ecosystem.

IMPLIKASI MODEL BIOEKONOMI TERHADAP MANAJEMEN PERIKANAN TANGKAP: STUDI KASUS DI PANTAI SELATAN YOGYAKARTA

Jurnal Perikanan Universitas Gadjah Mada Vol 5, No 1 (2003)
Publisher : Universitas Gadjah Mada

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Abstract

Small-scale marine capture fisheries have contributes to community welfare at Yogyakarta’s south coast. Government has planned some programs to develop fisheries. The development supposed only at rational effort in which fishers still gain advantages. Precautionary approach using bio-economic model of Gordon-Schaefer was applied to analyze the issue. The linear regression model of catch per unit of effort (C/f) (CPUE) and effort (f) was C/f = 59,851 – 0,0005f (R2 = 82, 71%). Fish price assumed at Rp 7,735.19 /kg with operational cost of Rp 59,835.67/trip. Total revenue and effort at maximum sustainable yield was predicted at Rp 13,396 billion and 56,860 trip (equals to 327 vessels), respectively. Fisher income at this level was Rp 167,774.51/trip/vessel. Fish exploration level in this area has already closed to total allowable catch. Free access equilibrium in which cost is equal to revenue might reach at effort of 102,231 trip (equals to 568 vessels). Managing fisheries at maximum economic yield might rise fisher income 17.83% comparing to maximum sustainable yield, but total revenue decreased 1.77% at 56.13% of existing effort. Some management strategies should be promoted and regulated for the fishery exploitation. Based on the results, those possible strategy were 1) limiting investment through regulation and permission; 2) improvement of fishers productivity through technology improvement to exploit  under-used fish resources; 3) expanding the fisheries activity to offshore through harbor development and social preparation; 4) marketing improvement through revitalization of fish action; 5) improving hadling and post harvest fish technology through training and extension; 6) the increasing of bargaining position through empowering fishers group; 7) promoting alternate incomes through integrated coastal tourism development; and 8) avoiding competition and conflict through developing Java’s south coast cooperation. Participatory approach in planning, developing and evaluating should be promoted to develop fishery a southern coast of Yogyakarta.

ANALISIS USAHA PURSE SEINE DI KECAMATAN JUWANA KABUPATEN PATI

Jurnal Perikanan Universitas Gadjah Mada Vol 15, No 2 (2013)
Publisher : Universitas Gadjah Mada

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Abstract

The research aimed to analyze fi sh catch, income, cost, and profit of purse seine fisheries in Juwana. Survey was conducted on 29 (twenty nine) purse seine owners as respondents, consisting of one mini purse seiners, five medium purse seiners, and 23 (twenty three) large purse seiners. All of them were interviewed by using questioners. The study showed that average total income per year was Rp1,603,020,400 for the large purse seiners, Rp924,444,000 for medium purse seiners, and Rp1,040,000,000 for mini purse seiners. The average of expense per year was Rp1,362,482,800 for the large purse seiners, Rp912,084,700 for the medium purse seiners, and Rp1,009,650,100 for the mini purse seiners consisting of fixed cost and total variable cost. The average fixed cost of big purse seiners is in amount of 17.5% from total cost (Rp238,392,800), the medium purse seiners is 19.8% (Rp. 180.578.100) and for the mini purse seiners is in amount of 14,8% (Rp149.750.100). The average of total variable cost from the total cost per year was in amount of 82.5% (Rp1.124.090.000) for the large purse seiners, 80.2% for the medium purse seiners (Rp731.506.600), and 85.2% for the mini purse seiners (Rp799.900.000). The net profit were Rp240.537.500 for large purse seiners, Rp12.359.600 for medium purse seiners, and Rp30.349.800 for mini purse seiners, respectively. The study showed that the Renevue-Cost Ratio is more than one, and there fore, purse seine businesses in Juwana generally are feasible to be developed. The purse seiners which were equiped with freezer technology generated higher net profit than others.

Dampak Program Corporate Social Responsibility terhadap Pendapatan Anggota Kelompok Pembudidaya Ikan Mina Kepis Desa Sumberadi Kecamatan Mlati Kabupaten Sleman

Jurnal Perikanan Universitas Gadjah Mada Vol 17, No 2 (2015)
Publisher : Universitas Gadjah Mada

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Abstract

The objective of this research is to determine the type, benefi ts, and impact of Corporate Social Responsibility (CSR) programs of Bank Indonesia on income of fi sh farmer group (KPI) Mina Kepis at Sumberadi village, Sleman Regency. The study was conducted from January to March 2015. All member of KPI were selected as respondents, with total number of 28 persons. The study showed that CSR program in the form of physical infrastructure assistance such as major production facilities (pool and hatchery) and supporting infrastructure (parking facilities and a fi sh market), training, mentoring, and fi eld visits. The programme has provided a range of benefi ts and positive impact including increasing in knowledge,production volume, and revenue KPI Mina Kepis members. Total member’s income before programme was Rp762.275.646 (2010), raised to Rp1.981.690.942 after CSR programme (2014). Good cooperation between the target group (recipient) and CSR programme partners (Bank Indonesia Yogyakarta, Sleman government, and the Department of Fisheries, Faculty of Agriculture UGM) has become one of the success factors for better performance indicators of the CSR programme at the target location.The objective of this research is to determine the type, benefi ts, and impact of Corporate SocialResponsibility (CSR) programs of Bank Indonesia on income of fi sh farmer group (KPI) Mina Kepis atSumberadi village, Sleman Regency. The study was conducted from January to March 2015. All member ofKPI were selected as respondents, with total number of 28 persons. The study showed that CSR programin the form of physical infrastructure assistance such as major production facilities (pool and hatchery)and supporting infrastructure (parking facilities and a fi sh market), training, mentoring, and fi eld visits.The programme has provided a range of benefi ts and positive impact including increasing in knowledge,production volume, and revenue KPI Mina Kepis members. Total member’s income before programmewas Rp762.275.646 (2010), raised to Rp1.981.690.942 after CSR programme (2014). Good cooperationbetween the target group (recipient) and CSR programme partners (Bank Indonesia Yogyakarta, Slemangovernment, and the Department of Fisheries, Faculty of Agriculture UGM) has become one of the successfactors for better performance indicators of the CSR programme at the target location.

PERIKANAN PELAGIS KECIL DI DAERAH TELUK: STUDI KASUS DI TELUK SAPE NUSA TENGGARA BARAT

Jurnal Perikanan Universitas Gadjah Mada Vol 4, No 1 (2002)
Publisher : Universitas Gadjah Mada

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Abstract

The aims of this research were to know the state of small pelagic fishery and social economic aspect of resources exploitation. To examine these issues, the research combined survey and descriptive analytic methods. Gordon-Schaefer model was applied to analyze the state of fishery and analytical descriptive to explained the relationship of the phenomenas. Data collection was based on indepth interview and recording of District Fishery Services. Samll pelagic fisheries that been analyzed were anchovies (Stolephorus sp.), squids (Loligo sp.), and mackerels (Rastrelliger sp.).There are two main problems of fisheries in the area, firstly, the conflict on coastal zone between marine capture fisheries and mariculture. The second one is the intensive exploitation of fisheries resources. Pelagic fisheries at Sape Bay have been exploited above maximum TAC mainly 80% of MSY. MSY of anchovies (Stolephorus sp.) reached 2324,9 ton at number of effort 56534 trip and MEY 2172,3 ton at number of effort 42144 trips. MSY of squids (Loligo sp.) is 455,0 ton at number of effort 12183 trip and MEY 449,0 ton at number of effort 10780 trips equal to Bagan Perahu  trips. The model was not applicable to predict the MSY and MEY of mackerels (Rastrelliger sp.). The continuing increase of effort will depleted the stock and decreased economic rent. In addition, the increasing of competition on fishing ground with pearl culture, have resulted fishermen stress. The integrated policy and management are needed to solve these problems and to avoid social riots. 

PARTISIPASI PEREMPUAN DALAM KONSERVASI MANGROVE DI DESA PASAR BANGGI KABUPATEN REMBANG

Jurnal Perikanan Universitas Gadjah Mada Vol 14, No 1 (2012)
Publisher : Universitas Gadjah Mada

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Abstract

This research was aims to determine the form, level and the factors affecting women’s participation in mangrove conservation at Pasar Banggi Village, Rembang District. Survey was conducted on respondents with total number of 95 people, comprised of 50 women, 14 men, 10 children and 25 people representing related agencies were interviewed with semi-open questionnaire. The study showed that there were nine forms of female participation in conservation activities, which was women who are looking for information, planting seeds, fi ll polybags, nursery planning, decision-making in the implementation of the nursery, nurture the seeds of mangrove, mangrove preserve, transfer of knowledge to children and warn if there is people cut the tree. Based on Arnstein (1969) participation ladder, the study showed that female participation rates ranging from therapy to the partnership. Factors that affect women in conservation were women’s perceptions of themselves, social status and public perception of women’s participation. Women play an important role in the cycle of mangrove conservation, especially in the nursery stage. Nevertheless, women have not been involved in the decision-making process and enjoy the sale of mangrove seedlings. Strengthening women’s bargaining power and involvement in the management group is required to enable the equality of access and control between men and women in a cycle of mangrove conservation. This research was aims to determine the form, level and the factors affecting women’s participation inmangrove conservation at Pasar Banggi Village, Rembang District. Survey was conducted on respondentswith total number of 95 people, comprised of 50 women, 14 men, 10 children and 25 people representingrelated agencies were interviewed with semi-open questionnaire. The study showed that there were nineforms of female participation in conservation activities, which was women who are looking for information,planting seeds, fi ll polybags, nursery planning, decision-making in the implementation of the nursery,nurture the seeds of mangrove, mangrove preserve, transfer of knowledge to children and warn if thereis people cut the tree. Based on Arnstein (1969) participation ladder, the study showed that femaleparticipation rates ranging from therapy to the partnership. Factors that affect women in conservationwere women’s perceptions of themselves, social status and public perception of women’s participation.Women play an important role in the cycle of mangrove conservation, especially in the nursery stage.Nevertheless, women have not been involved in the decision making process and enjoy the sale ofmangrove seedlings. Strengthening women’s bargaining power and involvement in the managementgroup is required to enable the equality of access and control between men and women in a cycle ofmangrove conservation.

DARI PETANI MENJADI NELAYAN: KAJIAN HISTORIS PERIKANAN TANGKAP PANTAI SELATAN YOGYAKARTA

Jurnal Perikanan Universitas Gadjah Mada Vol 4, No 1 (2002)
Publisher : Universitas Gadjah Mada

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Abstract

The aims of this research were to know the history and development of fisheries activity and its contribution to coastal community welfare at South Coast of Yogyakarta Special Territory Province. To examine these issues the research was conducted by combined survey and descriptive analytic methods. Fisheries in area could be categorized as new activity and historically community does not have a high dependency on marine capture fisheries. Fishers were  farmers who become fisherman due to several reasons such as limitation of land and lack of other job opportunity. Since the activity began in the end of 1970’s at Baron, marine capture fisheries have altered income sources, improve community houses, and attracted young people as well as provide productivity activity for rural women. In the recent time, marine capture fishery has dispersed to all of Yogyakarta South Coastal area at 19 fish-landing places with vary intensity of resources exploitation. Marine capture fisheries are still limited in the coastal zone. Although CPUE tend to increase, the activity should be extended to province management zone and ZEEI. The integrated policy and management are needed to solve these problems and to avoid the tragedy of the commons.

PERUBAHAN SOSIAL PETAMBAK DI KELURAHAN KARANGANYAR KECAMATAN TUGU KOTA SEMARANG

Jurnal Perikanan Universitas Gadjah Mada Vol 13, No 2 (2011)
Publisher : Universitas Gadjah Mada

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Penelitian ini bertujuan untuk mengetahui perubahan sosial petambak dalam 25 tahun (1986–2011) dan faktor-faktor penyebab perubahan tersebut di Kelurahan Karanganyar Kecamatan Tugu Semarang. Penelitian menggunakan metode sensus terhadap kelompok responden petambak yang masih aktif dan mantan petambak, yang masing-masing berjumlah 31 orangpetambak aktif dan 12 orangmantan petambak. Hasil penelitian menunjukkan bahwa telah terjadi perubahan struktur sosial, organisasi, dan kegiatan ekonomi petambak dalam seperempat abad terakhir. Lapisan kaya saat penelitianini dilakukan(2011) adalah pemilik tambakyang lahannya sudah dijual ke pabrik, tetapi masih dapat digarap sendiri dan pemilik tambak yang lahannya belum dijual ke pabrik, tetapi masih ada orang yang menyewa. Lapisan menengah yaitu penggarap yang memiliki luas garapan besar (>2 ha). Lapisan miskin terdiri atas buruh tambak, pemilik tambak yang lahan tambaknya belum dijual ke pabrik tetapi tidak ada orang yang menyewa, dan penggarap yang memiliki luas garapan kecil (< 2 ha). Organisasi yang terbentuk adalah dua kelompok petambak. Golongan pemilik dan penggarap sebagian besar menjadi wirausahawan, sedangkan golongan buruh menjadi buruh pabrik. Perubahan tata guna lahan dari kawasan tambak menjadi kawasan industri, penurunan produktivitas tambak, serta tingkat abrasi pantai yang sangat tinggi menjadi faktor penting perubahan sosial tersebut. Strategi adaptasi yang didukung oleh rekayasa sosial (social engineering) diperlukan untuk menanggapi berbagai perubahan tersebut.