Portal Jurnal Politeknik Negeri Semarang
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Integrating Automatic Arm Lifting Systems to Minimize Wire Broom Damage in Electric Road Sweepers
Get PDFElectric road sweepers often face damage to wire broom components due to manual operation errors, particularly when navigating obstacles like speed bumps. To mitigate this, an automatic arm lifting system using proximity sensors was developed to enhance efficiency and extend broom lifespan. This study focused on designing the wiring, determining optimal sensor detection distances, and assessing sensor angle inclinations for an electric road sweeper prototype. Functional testing determined that Sensor A should be placed 60 cm from the wire broom with a tilt angle of 42.2Ëš, a distance of 2936 mm to the ground, and 2800 mm to the object for lifting commands. For Sensor B, the lowering command requires a tilt angle of 49.4Ëš, a distance of 20 cm from the wire broom, 2692 mm to the ground, and 2200 mm to the object. These settings ensure the system effectively lifts the sweeper arm over obstacles, enhancing both efficiency and durability. The findings demonstrate the potential for advanced sensor technology to improve urban cleaning equipment and support sustainable city maintenance practices
Pengembangan Desain Teknologi Mesin Roller Bending untuk Besi Square Hollow
Get PDFKebutuhan mesin roller bending yang mampu melakukan bending dalam jumlah banyak meningkat imbas dari peningkatan jumlah rumah yang membutuhkan jasa dibidang tralis. Beberapa penelitian di bidang roller bending telah menciptakan mesin roller bending dengan satu stasiun roller. Padahal kebutuhan mesin roller bending yang mampu melakukan bending dalam kapasitas banyak diperlukan. Oleh karena hal itu, penelitian tentang mesin roller bending dengan kapasitas besar diperlukan. Dengan melakukan langkah-langkah penelitian pengembangan atau riset and development (R&D), maka ditargetkan terciptanya mesin roller bending hasil penelitian pengembangan. Tujuan penelitian ini adalah pengembangan mesin roller bending dari rancangan sebelumnya agar bisa diperoleh mesin yanag lebih efektif. Hasil penelitian ini meunjukkan bahwa mesin dapat memproduksi lebih banyak 4x lipat dan menghasilkan hasil kerutan yang lebih baik yaitu muncul pada radius pengerolan 1000 mm
Pengaruh Delignifikasi Alkali terhadap Perubahan Struktur Lignoselulosa Serbuk Sabut Kelapa sebagai Pengisi Komposit Geopolimer
Get PDFSabut kelapa, salah satu komoditi di Cilacap, memiliki potensi besar sebagai bahan olahan untuk berbagai aplikasi termasuk sebagai pengisi komposit geopolimer. Namun, kandungan lignin yang tinggi pada serbuk sabut kelapa dapat menghambat pemanfaatannya secara optimal. Delignifikasi alkali merupakan metode yang digunakan untuk mengurangi lignin dan meningkatkan selulosa. Penelitian ini bertujuan untuk mengetahui pengaruh delignifikasi alkali terhadap perubahan struktur lignoselulosa serbuk sabut kelapa, sehingga hasil penelitian ini dapat dijadikan referensi pada optimalisasi sifat mekanik komposit geopolimer. Metode penelitian meliputi perlakuan delignifikasi alkali, dengan variasi konsentrasi 1% dan 2% larutan NaOH, pada serbuk sabut kelapa dan karakterisasi struktur lignoselulosa menggunakan Chesson-Datta dan FTIR (Fourier Transform Infra Red). Hasil penelitian menunjukkan bahwa perlakuan delignifikasi alkali berhasil menurunkan kadar lignin pada interval 9% - 11% dan mengubah struktur lignoselulosa serbuk sabut kelapa. Berdasarkan hasil FTIR, puncak serapan bilangan gelombang 3310,83 cm-1 membuktikan adanya gugus fungsi O-H stretch, pada bilangan gelombang 2917,56 cm-1 membuktikan adanya gugus fungsi C-H Stretch. Puncak bilangan gelombang 1370,68 cm-1 membuktikan adanya gugus fungsi C-H bend dan pada bilangan gelombang 1225,78 cm-1 membuktikan adanya gugus fungsi C-O stretch
PENGARUH METODE PERAWATAN TERHADAP KUAT TEKAN BATAKO DAN PAVING BLOCK
Get PDFThis study was conducted to determine the appropriate maintenance method for bricksand paving blocks, both those that use fly ash and those that do not. The treatmentmethods used in the laboratory were water soaking, wet burlap wrap, plastic wrap,and no treatment with treatment ages of 7 days, 28 days, and 56 days. In the researchconducted at the factory, the treatment methods used were water soaking and notreatment with treatment ages of 8 days, 18 days, 29 days, and 61 days. The highestcompressive strength results in the laboratory reached 24 MPa for specimens withoutfly ash and 18 MPa for specimens with fly ash at 28 days with wet jute wrap treatment.The result of the optimum compressive strength of bricks in the factory reached 16.85MPa for bricks without fly ash and 19.6 MPa for bricks with fly ash at 61 days withthe no-treatment method. The highest average compressive strength of paving blocksin the factory reached 15.28 MPa for paving blocks without fly ash at 61 days withthe no-treatment method, while paving blocks with fly ash reached 19.6 MPa at 18days with the no-treatment method
PEMANFAATAN SURVEI GEOLISTRIK DAN GEOTEKNIK UNTUK IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN RENCANA JALAN LINGKAR POLITEKNIK PERTANIAN NEGERI SAMARINDA
Get PDFSoil conditions with weak zone points can cause damage to road structures such asland subsidence. Geoelectric surveys can identify subsurface structures based onvariations in rock resistivity. Road infrastructure crash due to weak zones of soilbearing capacity can be identified by geoelectric surveys and geotechnical tests assupporting analysis. Based on the master plan of Politani Samarinda 2025-2029 inthe southern area, a ring road of ± 1.5 km will be built, so geoelectric andgeotechnical support data are first needed as a basis for road planning. The mainobjective of this study is to mapping subsurface structure and identify the stability ofthe strong and weak zones of the soil in the planned area of the ring roadconstruction. The geoelectric resistivity survey uses the Wenner Schlumbergerconfiguration with 2 longitudinal tracks of ± 100 m per track with a spacing (a) of 5m which can identify the distribution of subsurface resistivity values laterallymapping.The resistivity value obtained from 2D geoelectric inversion is the lowestvalue of 2.62 ohm.m which is suspected as clay, medium 78.5 ohm.m which issuspected as sand, and the highest 7716 ohm.m which is suspected as sandstoneand used as a reference in the strong zone of the road building foundation.Furthermore, the USCS classification geotechnical test at 2 track points resulted insand (SM) and silt clay (MH) soil types based on mechanical laboratory tests. Theresults of the identification of geoelectric surveys and geotechnical tests have asignificant correlation with road construction that has a potential strong zonebearing capacity because the top soil is in the form of silt, clay, sand which isunderneath in the form of sandstone which is strong enough to withstand the load ofroad construction
EKSPLORASI DAMPAK PERUBAHAN MANUAL DESAIN PERKERASAN JALAN (MDPJ) 2017 KE 2024 MENGGUNAKAN PROGRAM KENPAVE
Get PDFhis study explores the impact of changes in the Manual for Pavement Design (MDPJ) from the 2017 edition to the 2024 edition, published by the Directorate General of Highways (DJBM) in May 2024, using the same secondary data as a comparative approach. The secondary data used in this research is from the Prambanan ”“ Piyungan road section in 2023. This exploration is considered crucial to identify how modifications in the latest design guidelines may influence the final outcomes in road planning, particularly in pavement performance.Using the KENPAVE program, the performance comparison between the two pavement designs is assessed based on predicted vulnerability levels to rutting (Nr), fatigue cracking (Nf), and permanent deformation (Nd). The first predicted failure value is then selected and used as a reference in this study. The comparative analysis results (based on the current study”™s secondary data) indicate that pavement design based on MDPJ 2024 has a lower vulnerability value than MDPJ 2017, with a percentage difference of 5.5%. This study confirms that the updates in the latest design guidelines contribute to improving pavement performance. The findings of this research are expected to support the effective and sustainable implementation of MDPJ 2024 in Indonesia
OPTIMALISASI KANDUNGAN KAPUR PADA MATERIAL ORGANIK UNTUK MENINGKATKAN KUAT GESER TANAH
Get PDFThe main problems with soft soils are high moisture content, low soil mineral content, and high compressibility. The use of bacteria from organic materials to form lime compounds as adhesives in soft clay stabilisation has not been done. So this research is intended to improve the soil by stabilising soft clay soil with bacteria in organic materials.The method used in this research is experimental method. Variations of soybean powder mixture (organic material) used were 5 g/L, 10 g/L, 20 g/L, 30 g/L, and 40 g/L with reagent concentration of 1 mol/L. Furthermore, CBR (California Bearing Ratio) test specimens and Unconfine compressive test (UCS) specimens were made to determine the effect of the addition of lime compounds on soil strength. The concentration of 30 g/L produces optimum lime deposits. This is in line with the results of SEM and XRD tests. The UCS test showed that the soil cemented with lime produced the optimum shear strength at 14 days of curing, with a free press of 86.39 kPa. While for a period of more than 14 days the increase in the value of free compressive strength is relatively very small
Juridical Analysis of MSME-Based Startups regarding the Legality of Business Operations by Semarang State Polytechnic Students
Get PDFMicro, Small, and Medium Enterprises, hereinafter referred to as MSMEs, are startups whose growth is being promoted in Indonesia. This study aims to analyse the awareness of the importance of legal business operations for MSME-based startups. Based on the Presidential Regulation of the Republic of Indonesia Number 98 of 2014 concerning Licensing for Micro and Small Businesses Article 1 Paragraph 3, a micro and small business permit, hereinafter abbreviated as IUMK, is a sign of legality to a person or business actor / certain activities in the form of a micro and small business permit in the form of one sheet. This permit certainly has an important role in supporting the running of related MSMEs. This research was conducted on 29 Independent Entrepreneurial Students of Politeknik Negeri Semarang. Respondents consisted of 65.5% women and 34.5% men. The majority of business types, 82.8%, are businesses in the culinary field. In this study, 62.1% of respondents considered that business legality was important for the business they were running. However, 72.4% of the respondents admitted that they had not taken care of their business legality. This business legality has not been taken care of for several reasons, the majority of which are because business legality management seems time-consuming, costly, and difficult to do. It can be concluded that the awareness of MSME actors, in this case, POLINES Independent Entrepreneurial Students, regarding the importance of business legality is high, it is just that it is necessary to update the procedures for obtaining business legality which is easier to do. In addition, there is a need for socialisation and assistance by the government, practitioners, and lecturers who work together to not only expand awareness of the importance of micro, small and medium enterprises legality but also provide knowledge on how to take care of MSME legalit
PENERAPAN METODE ECONOMIC ORDER QUANTITY (EOQ) DALAM PENGELOLAAN PERSEDIAAN BAHAN BAKU PADA PABRIK TAHU HANDAYANI UNGARAN TIMUR TAHUN 2023
Get PDFPabrik Tahu Handayani merupakan salah satu Usaha Mikro Kecil Menengah bergerak di bidang kuliner atau pengolahan pangan yang memproduksi tahu. Dalam proses produksi perlu adanya persediaan bahan baku yang dapat menjamin kualitas produk. Penulisan Tugas Akhir ini bertujuan untuk mengetahui pengelolaan persediaan bahan baku pada Pabrik Tahu Handayani tahun 2023 dan membandingkan dengan metode Economic Order Quantity (EOQ) untuk mengetahui jumlah pesanan ekonomis, titik pemesanan kembali hingga penghematan biaya persediaan. Data yang digunakan merupakan data primer yang berupa data kuantitatif dan kualitatif yang dikumpulkan melalui proses wawancara, observasi dan dokumenter. Penulisan data menggunakan metode deskripsi mengenai informasi gambaran umum dan metode eksposisi mengenai hasil perhitungan biaya persediaan. Dalam menganalisis data menggunakan metode komparasi yaitu membandingan metode perusahaan dengan metode Economic Order Quantity (EOQ). Hasil pengolahan data menunjukkan bahwa jumlah pesanan ekonomis kedelai sebesar 41.233 kg untuk setiap kali pesan dengan pemesanan sebanyak 2 kali selama satu tahun dapat dipesan kembali ketika jumlah kedelai tersisa 458 kg dan total penghematan biaya persediaan sebesar Rp 3.110.102
ANALISIS DAMPAK LITERASI KEUANGAN DAN PENGGUNAAN TEKNOLOGI INFORMASI BAGI UMKM DI SUNGAI JAWI LUAR
Get PDFUsaha Mikro, Kecil, dan Menengah (UMKM) memainkan peran penting pada perekonomian masyarakat Indonesia dengan kontribusinya pada pertumbuhan ekonomi ekonomi dan penciptaan lapangan kerja untuk masyarakat. Pentingnya literasi keuangan dan penerapan teknologi informasi akuntansi bagi pelaku UMKM semakin terasa dengan adanya pertumbuhan ekonomi yang begitu pesat. Penelitian ini bertujuan mengkaji dampak literasi keuangan dan penerapan teknologi informasi terhadap kinerja UMKM di kelurahan sungai jawi luar. Penelitian dilaksanakan pada UMKM yang beroperasi di kelurahan sungai jawi luar kota pontianak, kalimantan barat. Jenis penelitian yaitu kuantitatif. Teknik pengumpulan data yang digunakan antara lain studi literatur, kuesioner, dan observasi. Populasi penelitian yaitu pelaku UMKM yang beroperasi di kelurahan sungai jawi luar kota pontianak sebanyak 145 UMKM yang bergerak di berbagai bidang dan sudah menggunakan media sosial dan metode pembayaran digital dalam menjalankan usahanya. Pengambilan sampel menggunakan rumus slovin dengan sampel 60 responden. Teknik analisis menggunakan alat statistik SPSS. Temuan dalam penelitian ini menunjukkan bahwa literasi keuangan berpengaruh terhadap kinerja umkm, dan pemanfaatan teknologi informasi berpengaruh terhadap kinerja UMKM. Literasi keuangan dan pemanfaatan teknologi informasi berpengaruh terhadap kinerja UMKM secara simultan