Sugihardjo Sugihardjo
Prodi Magister Pendidikan Matematika, Pascasarjana, FKIP – UNS

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Hubungan Faktor Sosial Ekonomi Petani dengan Tingkat Difusi Inovasi Tumpangsari Jeruk dan Padi Sawah di Kecamatan Butuh Kabupaten Purworejo

Caraka Tani: Journal of Sustainable Agriculture Vol 17, No 1 (2002): March
Publisher : Universitas Sebelas Maret

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Abstract

Penelitian ini bertujuan untuk mengetahui adanya hubungan antara faktor sosial ekonomi petani (umur, pendidikan formal, kosmopolitas, penguasaan lahan dan pendapatan rumah tangga), dengan tingkat difusi inovasi tumpangsari jeruk dan padi sawah di Kecamatan Butuh Kabupaten Purworejo. Metode dasar yang digunakan adalah metode deskriptif analitis dengan teknik suvei. Pengambilan sampel dilakukan dengan stratified random sampling sebanyak 45 sampel yang terbagi dalam 3 strata kelompok tani lanjut, madya dan utama. Metode analisis yang digunakan untuk mengetahui hubungan antara faktor sosial ekonomi petani dengan tingkat difusi inovasi tumpangsari jeruk dan padi sawah adalah uji koefisien korelasi rank spearman (rs). Hasil penelitian menunjukkan adanya hubungan yang nyata antara pendidikan formal dan kosmopolitas petani dengan tingkat difusi inovasi tumpangsari jeruk dan padi sawah. Sedangkan untuk variabel umur, penguasaan lahan dan tingkat pendapatan rumah tangga petani tidak berhubungan nyata dengan tingkat difusi inovasi tumpangsari jeruk dan padi sawah.

EKSPERIMENTASI MODEL PEMBELAJARAN PROBLEM POSING DAN PROBLEM SOLVING PADA MATERI TRIGONOMETRI DITINJAU DARI KREATIVITAS PESERTA DIDIK KELAS XI IPA SMA SE-KABUPATEN KUDUS TAHUN PELAJARAN 2013/2014

Jurnal Pembelajaran Matematika Vol 2, No 5 (2014): Pembelajaran Matematika
Publisher : Jurnal Pembelajaran Matematika

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Abstract

Abstract: The aim of this research was to determine the effect of learning models on mathematics achievement and learning interest viewed from the students creativity. The learning model compared were problem posing, problem solving and direct instruction. The type of the research was a quasi experimental research with factorial design 3 x 3. The population was the students of senior high school in Kudus regency on academic year 2013/2014. The size of the sample was 278 learnes consisted of 98 students in the first experimental class, 81 students in the second experimental class and 99 students in the control class. The instrument used were mathemathics achievement test and questioner. The data was analyzed using analysis variance of two ways with unbalanced of cell. The conclusions of the research were as follows. (1) Problem solving model has better learning achievement than problem posing and direct instruction. Students who were taught by problem posing has better learning achievement than direct instruction, (2) Students who have high learning creativity have the same learning achievement as students who have the medium creativity. Students who have high learning creativity have better learning achievement than students who have low creativity. Students who have medium learning creativity have the same learning achievement as students who have low creativity, (3) Students having high and low creativity that used problem posing, problem solving, and direct instructional model have the same achievement. While students having medium creativity that used problem solving model have better achievement than students that used direct instructional model, but students that used problem posing and problem solving model have the same achievement, and the students that used problem posing and direct instructional model have the same achievement, (4) In each category of learning model, students with high creativity, medium and low have the same learning achievement. Key Words: Problem Posing, Problem Solving, Direct Instruction, Learning Creativity

STRATEGI PENGEMBANGAN USAHA EKONOMI PRODUKTIF BERBASIS POTENSI LOKAL PADA MASYARAKAT RAWAN KEMISKINAN DI SEKITAR WADUK KEDUNG OMBO

Caraka Tani: Journal of Sustainable Agriculture Vol 26, No 1 (2011): March
Publisher : Universitas Sebelas Maret

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Abstract

Community empowerment is a process to facilitate and encourage the community to be able to put themselves in proportion and become the main actors in the use of strategic environment to achieve a long-term sustainability. The development of productive economic activities is a rational option for strengthening the local economy and local development potential  in communities around the forest. The purpose of this study were 1) know the mapping of local commodities that have the potential to be empowered, 2) know the introduction of appropriate technologies that meet the characteristics of the local potential, 3) drafting of strategies for developing productive economic activities in vulnerable poverty communities around the forest, the basic method used in this research is descriptive qualitative research. The research was conducted in communities around the Dam of Kedungombo in Ngargotirto Village, Sub district of Sumberlawang, District of Sragen. The approach used in this study is the PRA (Participatory Rural Appraisal). The analysis used is a social institution analysis, stakeholder analysis and SWOT analysis. The results of the study concluded that Ngargotirto Village the postscript is a community around the forest take a relatively longer in the development of productive economic activities compared with the rice fields, or near urban communities. Viewed from the socio cultural perspective is not ready to receive industrialization in their lives and still occur clash between the culture industry and an agrarian culture. In an effort to stimulate and develop the productive economic activities, it needs a strategy that can build the foundation for productive economic activities, namely: 1) strategic forum for dialogue facilitation to synergize stakeholder, 2) institutional strengthening productive economic activities, 3) improve the capability sources human resources, 4) apply the appropriate technology. For that, the starting point in the development of productive economic activities in local communities is to synergize the clash of cultures.

EKSPERIMENTASI MODEL PEMBELAJARAN PROBLEM POSING DAN PROBLEM SOLVING PADA MATERI TRIGONOMETRI DITINJAU DARI KREATIVITAS PESERTA DIDIK KELAS XI IPA SMA SE-KABUPATEN KUDUS TAHUN PELAJARAN 2013/2014

Jurnal Pembelajaran Matematika Vol 2, No 5 (2014): Pembelajaran Matematika
Publisher : Jurnal Pembelajaran Matematika

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Abstract

Abstract: The aim of this research was to determine the effect of learning models on mathematics achievement and learning interest viewed from the students creativity. The learning model compared were problem posing, problem solving and direct instruction. The type of the research was a quasi experimental research with factorial design 3 x 3. The population was the students of senior high school in Kudus regency on academic year 2013/2014. The size of the sample was 278 learnes consisted of 98 students in the first experimental class, 81 students in the second experimental class and 99 students in the control class. The instrument used were mathemathics achievement test and questioner. The data was analyzed using analysis variance of two ways with unbalanced of cell. The conclusions of the research were as follows. (1) Problem solving model has better learning achievement than problem posing and direct instruction. Students who were taught by problem posing has better learning achievement than direct instruction, (2) Students who have high learning creativity have the same learning achievement as students who have the medium creativity. Students who have high learning creativity have better learning achievement than students who have low creativity. Students who have medium learning creativity have the same learning achievement as students who have low creativity, (3) Students having high and low creativity that used problem posing, problem solving, and direct instructional model have the same achievement. While students having medium creativity that used problem solving model have better achievement than students that used direct instructional model, but students that used problem posing and problem solving model have the same achievement, and the students that used problem posing and direct instructional model have the same achievement, (4) In each category of learning model, students with high creativity, medium and low have the same learning achievement. Key Words: Problem Posing, Problem Solving, Direct Instruction, Learning Creativity

The Competitiveness of Red Onion Production In Brebes, Central Java

Caraka Tani: Journal of Sustainable Agriculture Vol 18, No 2 (2003): October
Publisher : Universitas Sebelas Maret

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Abstract

Tujuan dari penelitian inin adalah untuk mengetahui dampak penggunaan bibit bawang merah impor terhadap produktivitas, keuntungan dan daya saing bawang merah di Kabupaten Brebes. Metode analisis yang digunakan adalah Matriks Analisis Kebijakan (Policy Analysis Matrix/PAM). Metode ini dapat untuk mengetahui efisiensi ekonomi, daya saing dan dampak kebijakan pemerintah terhadap sistem usahatani bawang merah. Data yang digunakan adalah data primer (hasil wawancara dengan petani) dan sekunder dari instansi terkait (BPS, Deperindag, Deptan, FAO, Bank Indonesia dan World Bank). Dari hasil analisis diketahui usahatani bawang merah pada dasarnya masih menguntungkan Petani yang menggunakan bibit bawang merah impor menghasilkan produksi dan keuntungan (privat dan social) lebih tinggi dibanding yang menggunakan varietas lokasl. Disamping itu juga diketahui adanya kebijakan pemerintah di pasar input telah menyebabkan petani membeli input dengan harga yang lebih tinggi disbanding harga sesungguhnya.

POSISI INDONESIA DALAM MIGRASI INTERNASIONAL DAN PASAR KERJA GLOBAL

Populasi Vol 7, No 1 (1996): Juni
Publisher : Pusat Studi Kependudukan dan Kebijakan, Universitas Gadjah Mada

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Abstract

The contribution of Indonesian work force in the International Labor Market is still very minimal, both in terms of quantity and quality. For this reason therefore, the reorientation of the labor force which is sent abroad from mere household workers to being better skilled workers is a very strategic step in improving on the national foreign exchange position and reducing unemployment. This paper is focussed on the importance of improving on the position of Indonesia in International migration through an anticipative focus on the availability of employment opportunities abroad, in order that the nature and the quality of the work force provided is in accordance with the demand in global labor market.

STUDI KELAYAKAN UNTUK IMPLEMENTASI INJEKSI CO2 SKALA PILOT DI LAPANGAN MINYAK A, SUMATERA SELATAN

Lembaran Publikasi Minyak dan Gas Bumi Vol 52, No 1 (2018)
Publisher : Lembaran Publikasi Minyak dan Gas Bumi

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Abstract

Injeksi CO2-Enhanced Oil Recovery (EOR) di lapangan minyak mature Indonesia untuk meningkatkan produksi minyak perlu segera diaplikasikan. Selain untuk meningkatkan produksi minyak, injeksi CO2-EOR juga digunakan untuk mengurangi emisi gas CO2 di atmosfer. Pemerintah perlu mengaplikasikan Carbon Capture Utilization and Storage (CCUS) untuk dapat mengurangi emisi gas rumah kaca (GRK) sesuai dengan RUEN dan INDC Indonesia yaitu sebesar 29% pada tahun 2030. Tujuan dilakukannya studi ini untuk mengkaji kelayakan dari proyek implementasi injeksi CO2 skala pilot di Lapangan Minyak A. Studi ini fokus pada studi kelayakan injeksi CO2 skala pilot di Lapangan Minyak A Lapisan Y Blok D di daerah Sumatera Selatan dimulai dari proses screening lapangan minyak untuk injeksi CO2, studi Geologi Geofisika dan Reservoir (GGR) serta analisis keekonomian yang mencakup skenario transportasi CO2 dari sumber CO2 ke lokasi injeksi. Dari hasil simulasi reservoir didapatkan bahwa injeksi CO2 secara dengan laju alir sebesar 150 ton per hari selama 5 tahun (dimulai dari awal 2017) dapat meningkatkan perolehan minyak menjadi 4,7% IOIP (dengan basecase 2% IOIP), sedangkan dengan menggunakan laju alir 75 ton per hari dapat meningkatkan sebesar 3,37% IOIP pada daerah prospek di Lapisan Y Blok D. Dari hasil analisis keekonomian, harga jual CO2 terendah diperoleh dari skenario II (transportasi menggunakan truk) sebesar US$48,13 per ton CO2 dan akan layak untuk diinjeksikan pada saat harga minyak lebih dari US$83 per barel.

Perubahan Sifat-Sifat Fluida Reservoir pada Injeksi CO2

Lembaran Publikasi Minyak dan Gas Bumi Vol 43, No 1 (2009)
Publisher : Lembaran Publikasi Minyak dan Gas Bumi

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Abstract

Injeksi gas CO2 ke dalam reservoir minyak merupakan EOR proven technology untuk menaikkan perolehan minyak. Sifat dasar dari gas CO2 adalah mampu tercampur dengan minyak, sehingga dapat mengubah sifat-sifat minyak. Perubahan sifat-sifat minyak pada injeksi CO2 dapat diamati di laboratorium. Analisis telah dilakukan dengan percontoh minyak diambil dari suatu reservoar undersaturated, dengan oAPI gravity 41.06, dan tekanan saturasinya 835 psig. TTM (tekanan terbaur minimal) fluida ini sebesar 2150 psig. Perubahan sifat-sifat fluida diamati dengan menginjeksikan CO2 secara bertahap. Komposisi CO2 injeksi berkisar antara 26,56 sampai dengan 55,96 persen mol. Sifat-sifat fluida yang diamati meliputi: tekanan saturasi, pengembangan minyak, kelarutan CO2, densitas, viskositas, dan komposisi fluida. Tekanan saturasi naik dari 835 psig menjadi 1850 psig. Faktor pengembangan minyak berkisar 1.10 sampai 1.41. Densitas minyak naik antara 14 sampai 45% pada tekanan saturasinya. Sedangkan harga viskositas minyak turun antara 51 sampai 76% pada tekanan saturasinya dibandingkan dengan harga viskositas mula-mula. Kelarutan CO2 akan naik dengan naiknya tekanan injeksi.

ASP INJECTIVITY ANALYSIS AS PREPARATION FOR FIELD IMPLEMENTATION

Scientific Contributions Oil and Gas Vol 41, No 1 (2018)
Publisher : Scientific Contributions Oil and Gas

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Abstract

This laboratory experiment is a highlight of the preparation of ASP (Alkaline-Surfactant-Polymer Mixture) chemical injection for field implementation to determine the injectivity parameter and the effect of fluid properties change during flow into the porous media. Therefore, the experiments were focus on injectivity which is represented by permeability change. Besides, IFT and viscosity reduction, and also adsorption of injected chemical on the surface of pore throat were also investigated. ASP chemical solution has been prepared for experiments, the mixture consists of 0.3% of Surfactant-A, 1000 ppm Polymer KP and 0.2% alkaline of NaOH. This mixture has been evaluated the bulk properties for instance: IFT, viscosity and other parameter such as: compatibility, thermal stability, phase behavior, and filtration that are suitable for enhanced oil recovery for the target oil field. The next step is to examine the interaction between rock and injected fluid that may change the fluid and rock properties. ASP injection in carbonate rock in this experiment may result in permeability damage and almost totally block the pore throat. Reduction of permeability is very significantly approaching the value of PRF of level 88.76%. The damage could not be revocable after post flush of water that is indicated that the permeability reduction is permanent. Fluid properties of the ASP including IFT and viscosity show that the IFT looks constant and no signifycant change, on the hand the viscosity of the fluid drops down to almost 32.6% from the original. However, the adsorptions are still categorized as normal.