Analisa Pengaruh Kualitas Batubara Terhadap Biaya Pembangkitan (Studi Kasus Di Pltu Rembang)

Coalisone of the sourcesof energythat are widely usedinpower generation. Indonesiancoal productionas much as254milliontons in 2009as much as75% is exported, while the remaining25% for domestic consumption. Since much ofhigh-gradecoal(coal highrange) wereexportedout of the countrymakes theplantsin Indonesiawereoperating usingwith alow qualitycoal. The results ofthe analysis carried outinPLTU RembangofSeptember-November 2013can be concludedthatthe lower thecalorific valueof coalisusedthe higher themass flow rateof coal, thesteammass flow rateisrelativelythe same. The higherthe load, the coalmass flow rateis also higher,the specificfuelconsumption(kg /kWh) was decrease,theheatratewas decrease. However,the thermalefficiencywas increase. When theload of180MWto 250MWmoreefficientuseof coalcomposition100% LRC. Ata loadof 200MWto 250MWmoreefficientuseof coalcomposition of25%MRCand75% LRC. From theaverage value ofthe price ofproduction, moreefficientuseof coalcomposition100% LRC, butwiththecompositioncan notachievethe highestload. When viewedfrom theaverage valuethatcanmeet thehighestload, themore efficientisbyusing thecoalcomposition of50% MRC and50% LRC

Evaluasi Kondisi Jembatan Kereta Api Bentang Tunggal

Degradation of railway bridge are influenced by aging, operational load, and environmental condition. Routine inspections on bridge are very important to give the information about existing condition. Limited of maintenance funding is the reason to rank bridge maintenance program or priority. PT KAI uses the Manajemen Perawatan Jembatan (MPJ, 1993) as bridge inspection procedure. The information however is in qualitative manner, which cannot justify the rank, so maintenance program is ineffective. Index condition model is one of alternative to resolve the problem, which can be used to rank the bridge structures or its components. The research carried out show index of 95.18 (very good) for BH (Bangunan Hikmat) 641 and index of 88.38 (very good) for BH 577. However condition of railroads for both of the bridges have index of 39.71(bad), thus need to be prioritized in maintenance program

Pengaruh Karakteristik Perusahaan, Struktur Kepemilikan, Dan Good Corporate Governance Terhadap Pengungkapan Triple Bottom Line Di Indonesia

This study aimed to analyze the effect of firm characteristics, ownership structure, corporate governance disclosure on the triple bottom line in Indonesia. Disclosure of the triple bottom line concept is defined as a result of the company's accounts reflect overall company performance both from the economic, social, and environmental. This study uses nine variables that predicted disclosure could affect the company's triple bottom line. Four variables are indicators of the characteristics of companies that leverage, profitability, liquidity, and industry types. Furthermore, there are three variables that are indicators of the ownership structure of the company is management ownership, foreign ownership, and institutional ownership. Meanwhile, two other variables show indicators of good corporate governance and the size of the board audit committee.This study used a sample of manufacturing firms listed Indonesia Stock Exchange during the period 2008-2011. A total of 200 annual reports of companies that meet the criteria have complete data for the study expressed as a sample. This study uses quantitative and analytical methods used is multiple regression.The results showed that not all of the variables in this study significantly influence the disclosure of the triple bottom line. Only the leverage variable, type of industry, size of board of directors, and audit committees that significantly influence the disclosure by the triple bottom line of the company. Other factors examined in this study such as profitability, liquidity, institutional ownership, management ownership, and foreign ownership does not significantly influence the triple bottom line disclosure by companies

Kajian Kelayakan Ekonomi Rencana Pembangunan Instalasi Pengolahan Air Limbah (Ipal) Domestik Komunal Sistem Uasb-dhs Di Kota Bogor

Domestic wastewater is one of the potential sources of environment pollution. Based on the JICA Report, 1995 the environmental pollution in Jabodetabek was 80% caused by the domestic wastewater. To minimize the environmental pollution, the wastewater have to be treated before discharge to river. Problem which often emerge in management of domestic waste is the limited land area and existing fund to built a wastewater treatment facility and also the high operating cost. To overcome these problems, it needs development of low cost wastewater treatment technology with high removal efficiency, easy to operate and also should be compact. A combination technology of Upflow Anaerobic Sludge Blanket (UASB) and Downflow Hanging Sponge (DHS) represents an economic wastewater treatment, easy to operate and has high removal efficiency that is 98% for BOD and 99,8% for bacterium. However, to build the wastewater treatment facility by using the UASB and DHS technology, it needs a feasibility study. This paper explains an economic and social feasibility study of application the UASB and DHS wastewater treatment technology at Bogor City. By the calculation of benefit and cost ratio (BCR), the result shows that the BCR is 2.13. It means the UASB and DHS wastewater treatment project at Bogor City was feasible

Kajian Pendahuluan Kelayakan Penerapan Instalasi Pengolahan Air Limbah Domestik secara Komunal di Permukiman Kota Bogor

A preliminary assessment of an application of sewerage system with Upflow Anaerobic Sludge Blanket (UASB) and Down flow Hanging Sponge (DHS) technology was conducted inNorth Bogor. The Problem which often emerge in management of domestic wastewater is the limited land area and fund to built and operate a wastewater treatment facility. To overcome such problem, it is needed to develop a cheap wastewater treatment technology with high efficiency, easy to operate and also should be compact. The combination technology of UASB and DHS is proposed as an economic wastewater treatment which easy to handling. Therefore, to make sure that the technology is feasible or not to be built inNorth Bogor, there is need the preliminary assessment. The assessment was conducted through a survey of technical and social economic aspect. The results show that sewerage system using UASB and DHS technology is feasible

Perbedaan Prestasi Belajar dan Keterampilan Proses Sains Materi Fisika

The purpose of this research is to analyze and find (1) the differences of academic achievement based on laboratory techniques, (2) the performance of academic achievement based on entry behavior, (3) the interaction between the practice and entry behavior on student achievement. The study was conducted in junior high school SMP Ma’arif 12 Terbanggi Besar, Lampung Tengah.Data collecting technique used observation technique and questionnaires, also all data being analyzed factorial design. The results showed that (1) there was difference in academic achievement of sciences based on practice technique because value sig,000 0,05 so Ho received.Tujuan penelitian ini adalah untuk menganalisis dan menemukan (1) perbedaan prestasi belajar yang disebabkan perbedaan teknik praktikum, (2) perbedaan prestasi belajar yang disebabkan perbedaan kemampuan awal (3) interaksi praktikum dan kemampuan awal terhadap prestasi belajar siswa. Penelitian dilakukan di SMP Ma’arif 12 Terbanggi Besar Lampung Tengah. Teknik pengumpulan data menggunakan tes, observasi dan angket serta dianalisis menggunakan desain faktorial. Hasil penelitian diperoleh (1) ada perbedaan prestasi belajar IPA yang disebabkan teknik praktikum karena nilai sig,000 0,05 sehingga Ho diterima

Model Penduga Volume Pohon Pulai Gading di Kabupaten Musi Rawas - Sumatera Selatan

Pendugaan volume tegakan pulai yang cepat, akurat, dan teliti sangat tergantung dari ketepatan model penduga volume pohon. Model penduga volume pohon dapat menjadi dasar dalam penyusunan tabel volume pohon. Tujuan penelitian ini adalah untuk melakukan penyusunan model penduga volume pohon yang memiliki ketelitian tinggi untuk jenis pulai gading di Kabupaten Musi Rawas, Sumatera Selatan. Persamaan regresi penyusun model terdiri dari 6 persamaan berdasarkan peubah bebas diameter setinggi dada dan tinggi pohon. Pemilihan model terbaik berdasarkan nilai koefisien determinasi maksimum (R 2), bias minimum dan root mean square error terkecil (RMSE). Hasil penelitian menunjukkan bahwa model terbaik untuk menduga volume pohon jenis pulai adalah V = 0,000077 D2,304 H 0,241 dengan nilai R 2 = 0,967%, bias 0,007% dan RMSE = 0,044%

Kajian Panjang Tunas Dan Bobot Umbi Bibit Terhadap Produksi Tanaman Kentang (Solanum Tuberosum L.) Varietas Granola

Produksi tanaman kentang di Indonesia dapat meningkat dengan didukung peng-gunaan bibit yang baik. Dalam hal ini dengan penggunaan umbi yang memiliki panjang tunas yang dijadikan sebagai kriteria viabilitas benih untuk mengetahui cepat lambatnya pertumbuhan awal ken-tang, serta penggunaan bobot umbi bibit yang tepat dalam mendukung produksi ken-tang. Penelitian ini bertujuan untuk men-dapatkan panjang tunas dan bobot umbi bibit yang tepat dalam meningkatkan pro-duksi kentang (Solanum tuberosum L.) Varietas Granola. Penelitian dilaksanakan pada bulan Agustus - November 2013, di Dusun Junggo, Desa Tulungrejo, Kec. Bumiaji, Kota Batu. Metode penelitian yang digunakan adalah Rancangan Acak Kelompok Faktorial dengan 9 perlakuan dan 3 ulangan yang meliputi 2 faktor. Faktor pertama, panjang tunas umbi bibit dan faktor kedua, bobot umbi bibit. Hasil pe-nelitian menunjukkan bahwa tanaman ken-tang dengan penggunaan berbagai variasi ukuran panjang tunas 0,3-0,7 cm, 1-1,4 cm, dan 1,7-2 cm tidak mempengaruhi kom-ponen pertumbuhan vegetatif tinggi tanam-an, jumlah batang, jumlah daun dan luas daun. Panjang tunas umbi bibit pada ber-bagai variasi ukuran 0,3-2 cm memiliki kemampuan yang sama terhadap produksi tanaman kentang yaitu 37,12-38,88 ton ha-1. Penggunaan berbagai variasi ukuran umbi bibit 35-50 g/umbi dan 55-70 g/umbi mem-pengaruhi komponen pertumbuhan vegetatif tinggi tanaman, jumlah batang, jumlah daun dan luas daun yang sama dan lebih tinggi daripada penggunaan umbi bibit 15-30 g/umbi. Penggunaan bobot umbi bibit 35-50 g/umbi memiliki potensi produksi yang sama dengan umbi bibit 55-70 g/umbi, sebesar 40,98 ton ha-1 dan 43,30 ton ha-1, lebih tinggi dibanding penggunaan umbi bibit 15-30 g/umbi dengan produksi 29,50 ton ha-1