One of the reasons for the slow conversion program from gasoline to LPG/Vigas is the uncertainty of profit or loss. Therefore, this article presents a simple calculator to assess the feasibility of investing in vehicle conversion, from gasoline to LPG/Vigas. Input parameters include estimated annual mileage, fuel consumption, gasoline prices, LPG / Vigas prices, the cost of the converter kit and its installation, engine standardization costs, maintenance costs with gasoline, and maintenance costs with LPG considered to produce output parameters that include Break Even Point (BEP), Payback period (PP), Net Present Value (NPV), and Internal Rate of Return (IRR).

The implementation of the ASEAN Clean Tourist City Standard caused restlessness among public fleet operators and the Department of Transportation of Magelang City. Therefore, this article presents the prediction of economic value and environmental benefits of public fleet in Magelang that will be converted from gasoline to LPG. Investment feasibility parameters, such as Break Event Point (BEP), Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PBP) are presented through three financing scenarios compared with the current gasoline price at the fuel station, RON 88 and RON 90. Simulation results indicate that investment is feasible with the government providing fiscal incentives through the procurement of converter kits. The wages of the public fleet crew under Minimum Wage City will rise by 30 % and 70 % to switch from gasoline RON 88 and gasoline RON 90, respectively. Meanwhile, environmental benefits are also expected to improve, with CO 2 emission reduction of 320.46 tons/year or about 11 % of gasoline usage. These two benefits (economics and environmental) are expected to support the clean city program in Magelang City, Indonesia.

The utilization of waste as soil stabilization materials is a solution to reduce the amount of waste and improve the building materials quality. This research is using Spent Bleaching Earth (SBE) materials from the palm oil industry waste. SBE can be reused to be pozzolan materials. This research aimed to investigate the SBE waste effect as an admixture on clay stabilization used 10% Clean Set Cements (CS-60) on density and California Bearing Ratio (CBR). A combination of CS-60 and SBE waste was expected to increase the CBR value of clay. Furthermore, SBE waste would decrease cementitious material for clay stabilization. Variation comparison of Clay : CS-60 : SBE on ST03, ST04, and ST05 were 67.5% : 10% : 22.5%; 45% : 10% : 45% and 22.5% : 10% : 67.5% respectively. The test was conducted on water content, density, and load penetration based on SNI 1744:2012. Generally, the CBR value of subgrade and improved subgrades oil with the moderate and good category are about 5-20%. As a result, the CBR value of ST 01 as original clay and ST 02 as clay with 10% CS-60 was 3.24% and 5.01%, respectively. Using SBE waste as an admixture material on clay stabilization increased CBR value better than clay stabilization used CS-60. ST03, ST04, and ST05 with CBR's value were 5.39%, 8.52%, and 17.99%, respectively. Furthermore, the density value decreased when SBE waste is used. Keywords : california bearing ratio, clay, clean set cement, spent bleaching earth, stabilization.   ABSTRAK Pemanfaatan limbah sebagai bahan stabilisasi tanah lempung merupakan solusi dalam mengurangi jumlah limbah dan meningkatkan mutu dari bahan bangunan. Penelitian ini menggunakan material Spent Bleaching Earth (SBE) dari limbah industri pengolahan minyak kelapa sawit. SBE dapat dimanfaatkan sebagai material pozzolan. Penelitian ini bertujuan untuk mengetahui pengaruh limbah SBE sebagai bahan tambah pada stabilisasi tanah lempung yang menggunakan 10% Clean Set Cements (CS-60) terhadap densitas dan California Bearing Ratio (CBR). Kombinasi limbah SBE dengan CS-60 diharapkan mampu meningkatkan nilai CBR tanah lempung. Selain itu, juga mengurangi penggunaan bahan berbasis semen untuk stabilisasi tanah lempung. Variasi perbandingan tanah lempung : CS-60 : SBE yang digunakan pada sampel ST03, ST04, dan ST05 berturut-turut 67,5% : 10% : 22,5%, 45% : 10% : 45% dan 22,5% : 10% : 67,5%. Pengujian yang dilakukan meliputi pengujian kadar air, densitas, dan penetrasi beban yang mengacu pada SNI 1744:2012. Secara umum, nilai CBR tanah dasar dan tanah timbunan dengan kategori sedang dan baik berkisar antara 5-20%. Hasil penelitian ini memperlihatkan bahwa sampel ST01 yang berupa tanah lempung asli memiliki nilai CBR 3,24% dan sampel ST02 yang berupa tanah lempung yang distabilisasi dengan 10% CS-60 menghasilkan nilai CBR 5,01%. Penambahan limbah SBE dapat meningkatkan nilai CBR dengan nilai yang lebih tinggi bila dibanding dengan hanya distabilisasi dengan CS-60, hal ini terlihat pada sampel ST03, ST04, dan ST05 dengan nilai CBR berurutan sebesar 5,39%, 8,52%, dan 17,99%. Selain itu, penambahan limbah SBE juga akan menurunkan densitas dari tanah lempung.   Kata kunci : california bearing ratio, clean set cement, spent bleaching earth, stabilisasi, tanah lempung.

One of Muntilan's TPS is the TPS 3R Enggal Nyaman in Ngemplak Hamlet. This TPS was constructed in 2014 and is equipped with sufficient and ready-to-use equipment. TPS 3R has a green house that is currently only used for ornamental plant planting. As a result, grape cultivation is being developed to increase the added value of organic products produced. Training and mentoring are used to provide this program. As a result of this program, partners able to make liquid fertilizer on their own and use it as a grape cultivation supporter in the new green house. TPS 3R Enggal Comfortable will benefit economically from this cultivation in the long term.

Home industry Ngudi Luhur Kaliurang adalah industri rumahan yang mengolah aneka makanan ringan yang berbahan baku salak. Prose produksi melalui serangkaian proses dari proses pengupasan, proses pemisahan daging dengan biji salak, proses penggorengan, proses penirisan, dan proses pengemasan. Proses pegupasan masih manual dengan menggunakan tangan tanpa alat bantu, sehingga sering terjadi kecelakaan kerja seperti tangan terluka karena tergores kulit salak. Di samping itu, kapasitas pengupasan menghasilkan sebesar 5,07 menit/2kg dan output standarnya sebesar 23,53 kg/jam. Oleh karena itu, perlu dilakukan perancangan alat pengupas salak mekanis yang mampu membantu pekerja dalam proses pengupasan salak dan mampu mengurangi keluhan yang dialami pekerja serta meningkatkan kapasitas produksi. Perancangan dengan menggunakan prinsip-prinsip ergonomi yang meliputi utility, comfortable, flexibility,  safety, dan aesthetic. Alat pengupas salak mekanis yang dirancang mempunyai spesifikasi  tinggi alat 93,49 cm, panjang handle penekan 75,92 cm dan diameter handle penekan 4,16 cm. Waktu baku dan output standar yang dihasilkan sebesar 4,64 menit/2kg dan output standarnya sebesar 25,97 kg/jam. Alat pengupas yang dirancang dapat meningkatkan output standar yang dihasilkan sehingga terjadi peningkatan produktivitas sebesar 10,37%. Tangan pekerja terhindar dari goresan kulit salak yang kasar dan berduri, sehingga proses pengupasan salak dapat dilakukan dengan mudah dan meningkatkan kenyamanan kerja.